6125 lines
228 KiB
C++
6125 lines
228 KiB
C++
/*
|
||
* Copyright © 2010 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
|
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
|
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
|
||
* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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||
* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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/**
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* \file ast_to_hir.c
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* Convert abstract syntax to to high-level intermediate reprensentation (HIR).
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*
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* During the conversion to HIR, the majority of the symantic checking is
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* preformed on the program. This includes:
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*
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* * Symbol table management
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* * Type checking
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* * Function binding
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*
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* The majority of this work could be done during parsing, and the parser could
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* probably generate HIR directly. However, this results in frequent changes
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* to the parser code. Since we do not assume that every system this complier
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* is built on will have Flex and Bison installed, we have to store the code
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* generated by these tools in our version control system. In other parts of
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* the system we've seen problems where a parser was changed but the generated
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* code was not committed, merge conflicts where created because two developers
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* had slightly different versions of Bison installed, etc.
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*
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* I have also noticed that running Bison generated parsers in GDB is very
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* irritating. When you get a segfault on '$$ = $1->foo', you can't very
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* well 'print $1' in GDB.
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*
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* As a result, my preference is to put as little C code as possible in the
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* parser (and lexer) sources.
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*/
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#include "glsl_symbol_table.h"
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#include "glsl_parser_extras.h"
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#include "ast.h"
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#include "glsl_types.h"
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#include "program/hash_table.h"
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#include "ir.h"
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#include "ir_builder.h"
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using namespace ir_builder;
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static void
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detect_conflicting_assignments(struct _mesa_glsl_parse_state *state,
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exec_list *instructions);
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static void
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remove_per_vertex_blocks(exec_list *instructions,
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_mesa_glsl_parse_state *state, ir_variable_mode mode);
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void
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_mesa_ast_to_hir(exec_list *instructions, struct _mesa_glsl_parse_state *state)
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{
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_mesa_glsl_initialize_variables(instructions, state);
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state->symbols->separate_function_namespace = state->language_version == 110;
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state->current_function = NULL;
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state->toplevel_ir = instructions;
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state->gs_input_prim_type_specified = false;
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state->cs_input_local_size_specified = false;
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/* Section 4.2 of the GLSL 1.20 specification states:
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* "The built-in functions are scoped in a scope outside the global scope
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* users declare global variables in. That is, a shader's global scope,
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* available for user-defined functions and global variables, is nested
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* inside the scope containing the built-in functions."
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*
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* Since built-in functions like ftransform() access built-in variables,
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* it follows that those must be in the outer scope as well.
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*
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* We push scope here to create this nesting effect...but don't pop.
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* This way, a shader's globals are still in the symbol table for use
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* by the linker.
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*/
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state->symbols->push_scope();
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foreach_list_typed (ast_node, ast, link, & state->translation_unit)
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ast->hir(instructions, state);
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detect_recursion_unlinked(state, instructions);
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detect_conflicting_assignments(state, instructions);
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state->toplevel_ir = NULL;
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/* Move all of the variable declarations to the front of the IR list, and
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* reverse the order. This has the (intended!) side effect that vertex
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* shader inputs and fragment shader outputs will appear in the IR in the
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* same order that they appeared in the shader code. This results in the
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* locations being assigned in the declared order. Many (arguably buggy)
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* applications depend on this behavior, and it matches what nearly all
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* other drivers do.
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*
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* However, do not push the declarations before struct decls or precision
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* statements.
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*/
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ir_instruction* before_node = (ir_instruction*)instructions->head;
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ir_instruction* after_node = NULL;
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while (before_node && (before_node->ir_type == ir_type_precision || before_node->ir_type == ir_type_typedecl))
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{
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after_node = before_node;
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before_node = (ir_instruction*)before_node->next;
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||
}
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foreach_in_list_safe(ir_instruction, node, instructions) {
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ir_variable *const var = node->as_variable();
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||
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if (var == NULL)
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continue;
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var->remove();
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if (after_node)
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after_node->insert_after(var);
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else
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instructions->push_head(var);
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}
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/* Figure out if gl_FragCoord is actually used in fragment shader */
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ir_variable *const var = state->symbols->get_variable("gl_FragCoord");
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if (var != NULL)
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state->fs_uses_gl_fragcoord = var->data.used;
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||
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/* From section 7.1 (Built-In Language Variables) of the GLSL 4.10 spec:
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*
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* If multiple shaders using members of a built-in block belonging to
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* the same interface are linked together in the same program, they
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* must all redeclare the built-in block in the same way, as described
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* in section 4.3.7 "Interface Blocks" for interface block matching, or
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* a link error will result.
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*
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* The phrase "using members of a built-in block" implies that if two
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* shaders are linked together and one of them *does not use* any members
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* of the built-in block, then that shader does not need to have a matching
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* redeclaration of the built-in block.
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*
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* This appears to be a clarification to the behaviour established for
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* gl_PerVertex by GLSL 1.50, therefore implement it regardless of GLSL
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* version.
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*
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* The definition of "interface" in section 4.3.7 that applies here is as
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* follows:
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*
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||
* The boundary between adjacent programmable pipeline stages: This
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* spans all the outputs in all compilation units of the first stage
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* and all the inputs in all compilation units of the second stage.
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*
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* Therefore this rule applies to both inter- and intra-stage linking.
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*
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* The easiest way to implement this is to check whether the shader uses
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* gl_PerVertex right after ast-to-ir conversion, and if it doesn't, simply
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* remove all the relevant variable declaration from the IR, so that the
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* linker won't see them and complain about mismatches.
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*/
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remove_per_vertex_blocks(instructions, state, ir_var_shader_in);
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remove_per_vertex_blocks(instructions, state, ir_var_shader_out);
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||
}
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||
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static ir_expression_operation
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get_conversion_operation(const glsl_type *to, const glsl_type *from,
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struct _mesa_glsl_parse_state *state)
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{
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switch (to->base_type) {
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case GLSL_TYPE_FLOAT:
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||
switch (from->base_type) {
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||
case GLSL_TYPE_INT: return ir_unop_i2f;
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||
case GLSL_TYPE_UINT: return ir_unop_u2f;
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default: return (ir_expression_operation)0;
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||
}
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||
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case GLSL_TYPE_UINT:
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||
if (!state->is_version(400, 0) && !state->ARB_gpu_shader5_enable)
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return (ir_expression_operation)0;
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switch (from->base_type) {
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case GLSL_TYPE_INT: return ir_unop_i2u;
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default: return (ir_expression_operation)0;
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||
}
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default: return (ir_expression_operation)0;
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||
}
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||
}
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||
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||
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||
/**
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||
* If a conversion is available, convert one operand to a different type
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*
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* The \c from \c ir_rvalue is converted "in place".
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||
*
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* \param to Type that the operand it to be converted to
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||
* \param from Operand that is being converted
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* \param state GLSL compiler state
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*
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* \return
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* If a conversion is possible (or unnecessary), \c true is returned.
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* Otherwise \c false is returned.
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*/
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bool
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apply_implicit_conversion(const glsl_type *to, ir_rvalue * &from,
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struct _mesa_glsl_parse_state *state)
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||
{
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void *ctx = state;
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if (to->base_type == from->type->base_type)
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return true;
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/* Prior to GLSL 1.20, there are no implicit conversions */
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if (!state->is_version(120, 0))
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return false;
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/* From page 27 (page 33 of the PDF) of the GLSL 1.50 spec:
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*
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* "There are no implicit array or structure conversions. For
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* example, an array of int cannot be implicitly converted to an
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* array of float.
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*/
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if (!to->is_numeric() || !from->type->is_numeric())
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return false;
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/* We don't actually want the specific type `to`, we want a type
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* with the same base type as `to`, but the same vector width as
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* `from`.
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*/
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to = glsl_type::get_instance(to->base_type, from->type->vector_elements,
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from->type->matrix_columns);
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ir_expression_operation op = get_conversion_operation(to, from->type, state);
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if (op) {
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from = new(ctx) ir_expression(op, to, from, NULL);
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return true;
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} else {
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return false;
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}
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}
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static const struct glsl_type *
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arithmetic_result_type(ir_rvalue * &value_a, ir_rvalue * &value_b,
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bool multiply,
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struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
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||
{
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||
const glsl_type *type_a = value_a->type;
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||
const glsl_type *type_b = value_b->type;
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/* From GLSL 1.50 spec, page 56:
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*
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||
* "The arithmetic binary operators add (+), subtract (-),
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* multiply (*), and divide (/) operate on integer and
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* floating-point scalars, vectors, and matrices."
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*/
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if (!type_a->is_numeric() || !type_b->is_numeric()) {
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_mesa_glsl_error(loc, state,
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||
"operands to arithmetic operators must be numeric");
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return glsl_type::error_type;
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||
}
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||
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||
/* "If one operand is floating-point based and the other is
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* not, then the conversions from Section 4.1.10 "Implicit
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* Conversions" are applied to the non-floating-point-based operand."
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*/
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if (!apply_implicit_conversion(type_a, value_b, state)
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&& !apply_implicit_conversion(type_b, value_a, state)) {
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_mesa_glsl_error(loc, state,
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"could not implicitly convert operands to "
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"arithmetic operator");
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return glsl_type::error_type;
|
||
}
|
||
type_a = value_a->type;
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||
type_b = value_b->type;
|
||
|
||
/* "If the operands are integer types, they must both be signed or
|
||
* both be unsigned."
|
||
*
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||
* From this rule and the preceeding conversion it can be inferred that
|
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* both types must be GLSL_TYPE_FLOAT, or GLSL_TYPE_UINT, or GLSL_TYPE_INT.
|
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* The is_numeric check above already filtered out the case where either
|
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* type is not one of these, so now the base types need only be tested for
|
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* equality.
|
||
*/
|
||
if (type_a->base_type != type_b->base_type) {
|
||
_mesa_glsl_error(loc, state,
|
||
"base type mismatch for arithmetic operator");
|
||
return glsl_type::error_type;
|
||
}
|
||
|
||
/* "All arithmetic binary operators result in the same fundamental type
|
||
* (signed integer, unsigned integer, or floating-point) as the
|
||
* operands they operate on, after operand type conversion. After
|
||
* conversion, the following cases are valid
|
||
*
|
||
* * The two operands are scalars. In this case the operation is
|
||
* applied, resulting in a scalar."
|
||
*/
|
||
if (type_a->is_scalar() && type_b->is_scalar())
|
||
return type_a;
|
||
|
||
/* "* One operand is a scalar, and the other is a vector or matrix.
|
||
* In this case, the scalar operation is applied independently to each
|
||
* component of the vector or matrix, resulting in the same size
|
||
* vector or matrix."
|
||
*/
|
||
if (type_a->is_scalar()) {
|
||
if (!type_b->is_scalar())
|
||
return type_b;
|
||
} else if (type_b->is_scalar()) {
|
||
return type_a;
|
||
}
|
||
|
||
/* All of the combinations of <scalar, scalar>, <vector, scalar>,
|
||
* <scalar, vector>, <scalar, matrix>, and <matrix, scalar> have been
|
||
* handled.
|
||
*/
|
||
assert(!type_a->is_scalar());
|
||
assert(!type_b->is_scalar());
|
||
|
||
/* "* The two operands are vectors of the same size. In this case, the
|
||
* operation is done component-wise resulting in the same size
|
||
* vector."
|
||
*/
|
||
if (type_a->is_vector() && type_b->is_vector()) {
|
||
if (type_a == type_b) {
|
||
return type_a;
|
||
} else {
|
||
_mesa_glsl_error(loc, state,
|
||
"vector size mismatch for arithmetic operator");
|
||
return glsl_type::error_type;
|
||
}
|
||
}
|
||
|
||
/* All of the combinations of <scalar, scalar>, <vector, scalar>,
|
||
* <scalar, vector>, <scalar, matrix>, <matrix, scalar>, and
|
||
* <vector, vector> have been handled. At least one of the operands must
|
||
* be matrix. Further, since there are no integer matrix types, the base
|
||
* type of both operands must be float.
|
||
*/
|
||
assert(type_a->is_matrix() || type_b->is_matrix());
|
||
assert(type_a->base_type == GLSL_TYPE_FLOAT);
|
||
assert(type_b->base_type == GLSL_TYPE_FLOAT);
|
||
|
||
/* "* The operator is add (+), subtract (-), or divide (/), and the
|
||
* operands are matrices with the same number of rows and the same
|
||
* number of columns. In this case, the operation is done component-
|
||
* wise resulting in the same size matrix."
|
||
* * The operator is multiply (*), where both operands are matrices or
|
||
* one operand is a vector and the other a matrix. A right vector
|
||
* operand is treated as a column vector and a left vector operand as a
|
||
* row vector. In all these cases, it is required that the number of
|
||
* columns of the left operand is equal to the number of rows of the
|
||
* right operand. Then, the multiply (*) operation does a linear
|
||
* algebraic multiply, yielding an object that has the same number of
|
||
* rows as the left operand and the same number of columns as the right
|
||
* operand. Section 5.10 "Vector and Matrix Operations" explains in
|
||
* more detail how vectors and matrices are operated on."
|
||
*/
|
||
if (! multiply) {
|
||
if (type_a == type_b)
|
||
return type_a;
|
||
} else {
|
||
if (type_a->is_matrix() && type_b->is_matrix()) {
|
||
/* Matrix multiply. The columns of A must match the rows of B. Given
|
||
* the other previously tested constraints, this means the vector type
|
||
* of a row from A must be the same as the vector type of a column from
|
||
* B.
|
||
*/
|
||
if (type_a->row_type() == type_b->column_type()) {
|
||
/* The resulting matrix has the number of columns of matrix B and
|
||
* the number of rows of matrix A. We get the row count of A by
|
||
* looking at the size of a vector that makes up a column. The
|
||
* transpose (size of a row) is done for B.
|
||
*/
|
||
const glsl_type *const type =
|
||
glsl_type::get_instance(type_a->base_type,
|
||
type_a->column_type()->vector_elements,
|
||
type_b->row_type()->vector_elements);
|
||
assert(type != glsl_type::error_type);
|
||
|
||
return type;
|
||
}
|
||
} else if (type_a->is_matrix()) {
|
||
/* A is a matrix and B is a column vector. Columns of A must match
|
||
* rows of B. Given the other previously tested constraints, this
|
||
* means the vector type of a row from A must be the same as the
|
||
* vector the type of B.
|
||
*/
|
||
if (type_a->row_type() == type_b) {
|
||
/* The resulting vector has a number of elements equal to
|
||
* the number of rows of matrix A. */
|
||
const glsl_type *const type =
|
||
glsl_type::get_instance(type_a->base_type,
|
||
type_a->column_type()->vector_elements,
|
||
1);
|
||
assert(type != glsl_type::error_type);
|
||
|
||
return type;
|
||
}
|
||
} else {
|
||
assert(type_b->is_matrix());
|
||
|
||
/* A is a row vector and B is a matrix. Columns of A must match rows
|
||
* of B. Given the other previously tested constraints, this means
|
||
* the type of A must be the same as the vector type of a column from
|
||
* B.
|
||
*/
|
||
if (type_a == type_b->column_type()) {
|
||
/* The resulting vector has a number of elements equal to
|
||
* the number of columns of matrix B. */
|
||
const glsl_type *const type =
|
||
glsl_type::get_instance(type_a->base_type,
|
||
type_b->row_type()->vector_elements,
|
||
1);
|
||
assert(type != glsl_type::error_type);
|
||
|
||
return type;
|
||
}
|
||
}
|
||
|
||
_mesa_glsl_error(loc, state, "size mismatch for matrix multiplication");
|
||
return glsl_type::error_type;
|
||
}
|
||
|
||
|
||
/* "All other cases are illegal."
|
||
*/
|
||
_mesa_glsl_error(loc, state, "type mismatch");
|
||
return glsl_type::error_type;
|
||
}
|
||
|
||
|
||
static const struct glsl_type *
|
||
unary_arithmetic_result_type(const struct glsl_type *type,
|
||
struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
|
||
{
|
||
/* From GLSL 1.50 spec, page 57:
|
||
*
|
||
* "The arithmetic unary operators negate (-), post- and pre-increment
|
||
* and decrement (-- and ++) operate on integer or floating-point
|
||
* values (including vectors and matrices). All unary operators work
|
||
* component-wise on their operands. These result with the same type
|
||
* they operated on."
|
||
*/
|
||
if (!type->is_numeric()) {
|
||
_mesa_glsl_error(loc, state,
|
||
"operands to arithmetic operators must be numeric");
|
||
return glsl_type::error_type;
|
||
}
|
||
|
||
return type;
|
||
}
|
||
|
||
/**
|
||
* \brief Return the result type of a bit-logic operation.
|
||
*
|
||
* If the given types to the bit-logic operator are invalid, return
|
||
* glsl_type::error_type.
|
||
*
|
||
* \param type_a Type of LHS of bit-logic op
|
||
* \param type_b Type of RHS of bit-logic op
|
||
*/
|
||
static const struct glsl_type *
|
||
bit_logic_result_type(const struct glsl_type *type_a,
|
||
const struct glsl_type *type_b,
|
||
ast_operators op,
|
||
struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
|
||
{
|
||
if (!state->check_bitwise_operations_allowed(loc)) {
|
||
return glsl_type::error_type;
|
||
}
|
||
|
||
/* From page 50 (page 56 of PDF) of GLSL 1.30 spec:
|
||
*
|
||
* "The bitwise operators and (&), exclusive-or (^), and inclusive-or
|
||
* (|). The operands must be of type signed or unsigned integers or
|
||
* integer vectors."
|
||
*/
|
||
if (!type_a->is_integer()) {
|
||
_mesa_glsl_error(loc, state, "LHS of `%s' must be an integer",
|
||
ast_expression::operator_string(op));
|
||
return glsl_type::error_type;
|
||
}
|
||
if (!type_b->is_integer()) {
|
||
_mesa_glsl_error(loc, state, "RHS of `%s' must be an integer",
|
||
ast_expression::operator_string(op));
|
||
return glsl_type::error_type;
|
||
}
|
||
|
||
/* "The fundamental types of the operands (signed or unsigned) must
|
||
* match,"
|
||
*/
|
||
if (type_a->base_type != type_b->base_type) {
|
||
_mesa_glsl_error(loc, state, "operands of `%s' must have the same "
|
||
"base type", ast_expression::operator_string(op));
|
||
return glsl_type::error_type;
|
||
}
|
||
|
||
/* "The operands cannot be vectors of differing size." */
|
||
if (type_a->is_vector() &&
|
||
type_b->is_vector() &&
|
||
type_a->vector_elements != type_b->vector_elements) {
|
||
_mesa_glsl_error(loc, state, "operands of `%s' cannot be vectors of "
|
||
"different sizes", ast_expression::operator_string(op));
|
||
return glsl_type::error_type;
|
||
}
|
||
|
||
/* "If one operand is a scalar and the other a vector, the scalar is
|
||
* applied component-wise to the vector, resulting in the same type as
|
||
* the vector. The fundamental types of the operands [...] will be the
|
||
* resulting fundamental type."
|
||
*/
|
||
if (type_a->is_scalar())
|
||
return type_b;
|
||
else
|
||
return type_a;
|
||
}
|
||
|
||
static const struct glsl_type *
|
||
modulus_result_type(const struct glsl_type *type_a,
|
||
const struct glsl_type *type_b,
|
||
struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
|
||
{
|
||
if (!state->check_version(130, 300, loc, "operator '%%' is reserved")) {
|
||
return glsl_type::error_type;
|
||
}
|
||
|
||
/* From GLSL 1.50 spec, page 56:
|
||
* "The operator modulus (%) operates on signed or unsigned integers or
|
||
* integer vectors. The operand types must both be signed or both be
|
||
* unsigned."
|
||
*/
|
||
if (!type_a->is_integer()) {
|
||
_mesa_glsl_error(loc, state, "LHS of operator %% must be an integer");
|
||
return glsl_type::error_type;
|
||
}
|
||
if (!type_b->is_integer()) {
|
||
_mesa_glsl_error(loc, state, "RHS of operator %% must be an integer");
|
||
return glsl_type::error_type;
|
||
}
|
||
if (type_a->base_type != type_b->base_type) {
|
||
_mesa_glsl_error(loc, state,
|
||
"operands of %% must have the same base type");
|
||
return glsl_type::error_type;
|
||
}
|
||
|
||
/* "The operands cannot be vectors of differing size. If one operand is
|
||
* a scalar and the other vector, then the scalar is applied component-
|
||
* wise to the vector, resulting in the same type as the vector. If both
|
||
* are vectors of the same size, the result is computed component-wise."
|
||
*/
|
||
if (type_a->is_vector()) {
|
||
if (!type_b->is_vector()
|
||
|| (type_a->vector_elements == type_b->vector_elements))
|
||
return type_a;
|
||
} else
|
||
return type_b;
|
||
|
||
/* "The operator modulus (%) is not defined for any other data types
|
||
* (non-integer types)."
|
||
*/
|
||
_mesa_glsl_error(loc, state, "type mismatch");
|
||
return glsl_type::error_type;
|
||
}
|
||
|
||
|
||
static const struct glsl_type *
|
||
relational_result_type(ir_rvalue * &value_a, ir_rvalue * &value_b,
|
||
struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
|
||
{
|
||
const glsl_type *type_a = value_a->type;
|
||
const glsl_type *type_b = value_b->type;
|
||
|
||
/* From GLSL 1.50 spec, page 56:
|
||
* "The relational operators greater than (>), less than (<), greater
|
||
* than or equal (>=), and less than or equal (<=) operate only on
|
||
* scalar integer and scalar floating-point expressions."
|
||
*/
|
||
if (!type_a->is_numeric()
|
||
|| !type_b->is_numeric()
|
||
|| !type_a->is_scalar()
|
||
|| !type_b->is_scalar()) {
|
||
_mesa_glsl_error(loc, state,
|
||
"operands to relational operators must be scalar and "
|
||
"numeric");
|
||
return glsl_type::error_type;
|
||
}
|
||
|
||
/* "Either the operands' types must match, or the conversions from
|
||
* Section 4.1.10 "Implicit Conversions" will be applied to the integer
|
||
* operand, after which the types must match."
|
||
*/
|
||
if (!apply_implicit_conversion(type_a, value_b, state)
|
||
&& !apply_implicit_conversion(type_b, value_a, state)) {
|
||
_mesa_glsl_error(loc, state,
|
||
"could not implicitly convert operands to "
|
||
"relational operator");
|
||
return glsl_type::error_type;
|
||
}
|
||
type_a = value_a->type;
|
||
type_b = value_b->type;
|
||
|
||
if (type_a->base_type != type_b->base_type) {
|
||
_mesa_glsl_error(loc, state, "base type mismatch");
|
||
return glsl_type::error_type;
|
||
}
|
||
|
||
/* "The result is scalar Boolean."
|
||
*/
|
||
return glsl_type::bool_type;
|
||
}
|
||
|
||
/**
|
||
* \brief Return the result type of a bit-shift operation.
|
||
*
|
||
* If the given types to the bit-shift operator are invalid, return
|
||
* glsl_type::error_type.
|
||
*
|
||
* \param type_a Type of LHS of bit-shift op
|
||
* \param type_b Type of RHS of bit-shift op
|
||
*/
|
||
static const struct glsl_type *
|
||
shift_result_type(const struct glsl_type *type_a,
|
||
const struct glsl_type *type_b,
|
||
ast_operators op,
|
||
struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
|
||
{
|
||
if (!state->check_bitwise_operations_allowed(loc)) {
|
||
return glsl_type::error_type;
|
||
}
|
||
|
||
/* From page 50 (page 56 of the PDF) of the GLSL 1.30 spec:
|
||
*
|
||
* "The shift operators (<<) and (>>). For both operators, the operands
|
||
* must be signed or unsigned integers or integer vectors. One operand
|
||
* can be signed while the other is unsigned."
|
||
*/
|
||
if (!type_a->is_integer()) {
|
||
_mesa_glsl_error(loc, state, "LHS of operator %s must be an integer or "
|
||
"integer vector", ast_expression::operator_string(op));
|
||
return glsl_type::error_type;
|
||
|
||
}
|
||
if (!type_b->is_integer()) {
|
||
_mesa_glsl_error(loc, state, "RHS of operator %s must be an integer or "
|
||
"integer vector", ast_expression::operator_string(op));
|
||
return glsl_type::error_type;
|
||
}
|
||
|
||
/* "If the first operand is a scalar, the second operand has to be
|
||
* a scalar as well."
|
||
*/
|
||
if (type_a->is_scalar() && !type_b->is_scalar()) {
|
||
_mesa_glsl_error(loc, state, "if the first operand of %s is scalar, the "
|
||
"second must be scalar as well",
|
||
ast_expression::operator_string(op));
|
||
return glsl_type::error_type;
|
||
}
|
||
|
||
/* If both operands are vectors, check that they have same number of
|
||
* elements.
|
||
*/
|
||
if (type_a->is_vector() &&
|
||
type_b->is_vector() &&
|
||
type_a->vector_elements != type_b->vector_elements) {
|
||
_mesa_glsl_error(loc, state, "vector operands to operator %s must "
|
||
"have same number of elements",
|
||
ast_expression::operator_string(op));
|
||
return glsl_type::error_type;
|
||
}
|
||
|
||
/* "In all cases, the resulting type will be the same type as the left
|
||
* operand."
|
||
*/
|
||
return type_a;
|
||
}
|
||
|
||
/**
|
||
* Validates that a value can be assigned to a location with a specified type
|
||
*
|
||
* Validates that \c rhs can be assigned to some location. If the types are
|
||
* not an exact match but an automatic conversion is possible, \c rhs will be
|
||
* converted.
|
||
*
|
||
* \return
|
||
* \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type.
|
||
* Otherwise the actual RHS to be assigned will be returned. This may be
|
||
* \c rhs, or it may be \c rhs after some type conversion.
|
||
*
|
||
* \note
|
||
* In addition to being used for assignments, this function is used to
|
||
* type-check return values.
|
||
*/
|
||
ir_rvalue *
|
||
validate_assignment(struct _mesa_glsl_parse_state *state,
|
||
YYLTYPE loc, const glsl_type *lhs_type,
|
||
ir_rvalue *rhs, bool is_initializer)
|
||
{
|
||
/* If there is already some error in the RHS, just return it. Anything
|
||
* else will lead to an avalanche of error message back to the user.
|
||
*/
|
||
if (rhs->type->is_error())
|
||
return rhs;
|
||
|
||
/* If the types are identical, the assignment can trivially proceed.
|
||
*/
|
||
if (rhs->type == lhs_type)
|
||
return rhs;
|
||
|
||
/* If the array element types are the same and the LHS is unsized,
|
||
* the assignment is okay for initializers embedded in variable
|
||
* declarations.
|
||
*
|
||
* Note: Whole-array assignments are not permitted in GLSL 1.10, but this
|
||
* is handled by ir_dereference::is_lvalue.
|
||
*/
|
||
if (lhs_type->is_unsized_array() && rhs->type->is_array()
|
||
&& (lhs_type->element_type() == rhs->type->element_type())) {
|
||
if (is_initializer) {
|
||
return rhs;
|
||
} else {
|
||
_mesa_glsl_error(&loc, state,
|
||
"implicitly sized arrays cannot be assigned");
|
||
return NULL;
|
||
}
|
||
}
|
||
|
||
/* Check for implicit conversion in GLSL 1.20 */
|
||
if (apply_implicit_conversion(lhs_type, rhs, state)) {
|
||
if (rhs->type == lhs_type)
|
||
return rhs;
|
||
}
|
||
|
||
_mesa_glsl_error(&loc, state,
|
||
"%s of type %s cannot be assigned to "
|
||
"variable of type %s",
|
||
is_initializer ? "initializer" : "value",
|
||
rhs->type->name, lhs_type->name);
|
||
|
||
return NULL;
|
||
}
|
||
|
||
static void
|
||
mark_whole_array_access(ir_rvalue *access)
|
||
{
|
||
ir_dereference_variable *deref = access->as_dereference_variable();
|
||
|
||
if (deref && deref->var) {
|
||
deref->var->data.max_array_access = deref->type->length - 1;
|
||
}
|
||
}
|
||
|
||
static bool
|
||
do_assignment(exec_list *instructions, struct _mesa_glsl_parse_state *state,
|
||
const char *non_lvalue_description,
|
||
ir_rvalue *lhs, ir_rvalue *rhs,
|
||
ir_rvalue **out_rvalue, bool needs_rvalue,
|
||
bool is_initializer,
|
||
YYLTYPE lhs_loc)
|
||
{
|
||
void *ctx = state;
|
||
bool error_emitted = (lhs->type->is_error() || rhs->type->is_error());
|
||
ir_rvalue *extract_channel = NULL;
|
||
|
||
/* If the assignment LHS comes back as an ir_binop_vector_extract
|
||
* expression, move it to the RHS as an ir_triop_vector_insert.
|
||
*/
|
||
if (lhs->ir_type == ir_type_expression) {
|
||
ir_expression *const lhs_expr = lhs->as_expression();
|
||
|
||
if (unlikely(lhs_expr->operation == ir_binop_vector_extract)) {
|
||
ir_rvalue *new_rhs =
|
||
validate_assignment(state, lhs_loc, lhs->type,
|
||
rhs, is_initializer);
|
||
|
||
if (new_rhs == NULL) {
|
||
return lhs;
|
||
} else {
|
||
/* This converts:
|
||
* - LHS: (expression float vector_extract <vec> <channel>)
|
||
* - RHS: <scalar>
|
||
* into:
|
||
* - LHS: <vec>
|
||
* - RHS: (expression vec2 vector_insert <vec> <channel> <scalar>)
|
||
*
|
||
* The LHS type is now a vector instead of a scalar. Since GLSL
|
||
* allows assignments to be used as rvalues, we need to re-extract
|
||
* the channel from assignment_temp when returning the rvalue.
|
||
*/
|
||
extract_channel = lhs_expr->operands[1];
|
||
rhs = new(ctx) ir_expression(ir_triop_vector_insert,
|
||
lhs_expr->operands[0]->type,
|
||
lhs_expr->operands[0],
|
||
new_rhs,
|
||
extract_channel);
|
||
lhs = lhs_expr->operands[0]->clone(ctx, NULL);
|
||
}
|
||
}
|
||
}
|
||
|
||
ir_variable *lhs_var = lhs->variable_referenced();
|
||
if (lhs_var)
|
||
lhs_var->data.assigned = true;
|
||
|
||
if (!error_emitted) {
|
||
if (non_lvalue_description != NULL) {
|
||
_mesa_glsl_error(&lhs_loc, state,
|
||
"assignment to %s",
|
||
non_lvalue_description);
|
||
error_emitted = true;
|
||
} else if (lhs_var != NULL && lhs_var->data.read_only) {
|
||
_mesa_glsl_error(&lhs_loc, state,
|
||
"assignment to read-only variable '%s'",
|
||
lhs_var->name);
|
||
error_emitted = true;
|
||
} else if (lhs->type->is_array() &&
|
||
!state->check_version(120, 300, &lhs_loc,
|
||
"whole array assignment forbidden")) {
|
||
/* From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
|
||
*
|
||
* "Other binary or unary expressions, non-dereferenced
|
||
* arrays, function names, swizzles with repeated fields,
|
||
* and constants cannot be l-values."
|
||
*
|
||
* The restriction on arrays is lifted in GLSL 1.20 and GLSL ES 3.00.
|
||
*/
|
||
error_emitted = true;
|
||
} else if (!lhs->is_lvalue()) {
|
||
_mesa_glsl_error(& lhs_loc, state, "non-lvalue in assignment");
|
||
error_emitted = true;
|
||
}
|
||
}
|
||
|
||
ir_rvalue *new_rhs =
|
||
validate_assignment(state, lhs_loc, lhs->type, rhs, is_initializer);
|
||
if (new_rhs != NULL) {
|
||
rhs = new_rhs;
|
||
|
||
/* If the LHS array was not declared with a size, it takes it size from
|
||
* the RHS. If the LHS is an l-value and a whole array, it must be a
|
||
* dereference of a variable. Any other case would require that the LHS
|
||
* is either not an l-value or not a whole array.
|
||
*/
|
||
if (lhs->type->is_unsized_array()) {
|
||
ir_dereference *const d = lhs->as_dereference();
|
||
|
||
assert(d != NULL);
|
||
|
||
ir_variable *const var = d->variable_referenced();
|
||
|
||
assert(var != NULL);
|
||
|
||
if (var->data.max_array_access >= unsigned(rhs->type->array_size())) {
|
||
/* FINISHME: This should actually log the location of the RHS. */
|
||
_mesa_glsl_error(& lhs_loc, state, "array size must be > %u due to "
|
||
"previous access",
|
||
var->data.max_array_access);
|
||
}
|
||
|
||
var->type = glsl_type::get_array_instance(lhs->type->element_type(),
|
||
rhs->type->array_size());
|
||
d->type = var->type;
|
||
}
|
||
if (lhs->type->is_array()) {
|
||
mark_whole_array_access(rhs);
|
||
mark_whole_array_access(lhs);
|
||
}
|
||
}
|
||
|
||
if (lhs->get_precision() == glsl_precision_undefined)
|
||
{
|
||
glsl_precision prec = precision_from_ir (rhs);
|
||
ir_dereference *const d = lhs->as_dereference();
|
||
if (d)
|
||
{
|
||
ir_variable *const var = d->variable_referenced();
|
||
if (var)
|
||
var->data.precision = prec;
|
||
}
|
||
}
|
||
|
||
/* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
|
||
* but not post_inc) need the converted assigned value as an rvalue
|
||
* to handle things like:
|
||
*
|
||
* i = j += 1;
|
||
*/
|
||
if (needs_rvalue) {
|
||
ir_variable *var = new(ctx) ir_variable(rhs->type, "assignment_tmp",
|
||
ir_var_temporary, precision_from_ir(rhs));
|
||
instructions->push_tail(var);
|
||
instructions->push_tail(assign(var, rhs));
|
||
|
||
if (!error_emitted) {
|
||
ir_dereference_variable *deref_var = new(ctx) ir_dereference_variable(var);
|
||
instructions->push_tail(new(ctx) ir_assignment(lhs, deref_var));
|
||
}
|
||
ir_rvalue *rvalue = new(ctx) ir_dereference_variable(var);
|
||
|
||
if (extract_channel) {
|
||
rvalue = new(ctx) ir_expression(ir_binop_vector_extract,
|
||
rvalue,
|
||
extract_channel->clone(ctx, NULL));
|
||
}
|
||
|
||
*out_rvalue = rvalue;
|
||
} else {
|
||
if (!error_emitted)
|
||
instructions->push_tail(new(ctx) ir_assignment(lhs, rhs));
|
||
*out_rvalue = NULL;
|
||
}
|
||
|
||
return error_emitted;
|
||
}
|
||
|
||
static ir_rvalue *
|
||
get_lvalue_copy(exec_list *instructions, ir_rvalue *lvalue)
|
||
{
|
||
void *ctx = ralloc_parent(lvalue);
|
||
ir_variable *var;
|
||
|
||
var = new(ctx) ir_variable(lvalue->type, "_post_incdec_tmp",
|
||
ir_var_temporary, precision_from_ir(lvalue));
|
||
instructions->push_tail(var);
|
||
|
||
instructions->push_tail(new(ctx) ir_assignment(new(ctx) ir_dereference_variable(var),
|
||
lvalue));
|
||
|
||
return new(ctx) ir_dereference_variable(var);
|
||
}
|
||
|
||
|
||
ir_rvalue *
|
||
ast_node::hir(exec_list *instructions, struct _mesa_glsl_parse_state *state)
|
||
{
|
||
(void) instructions;
|
||
(void) state;
|
||
|
||
return NULL;
|
||
}
|
||
|
||
void
|
||
ast_function_expression::hir_no_rvalue(exec_list *instructions,
|
||
struct _mesa_glsl_parse_state *state)
|
||
{
|
||
(void)hir(instructions, state);
|
||
}
|
||
|
||
void
|
||
ast_aggregate_initializer::hir_no_rvalue(exec_list *instructions,
|
||
struct _mesa_glsl_parse_state *state)
|
||
{
|
||
(void)hir(instructions, state);
|
||
}
|
||
|
||
static ir_rvalue *
|
||
do_comparison(void *mem_ctx, int operation, ir_rvalue *op0, ir_rvalue *op1)
|
||
{
|
||
int join_op;
|
||
ir_rvalue *cmp = NULL;
|
||
|
||
if (operation == ir_binop_all_equal)
|
||
join_op = ir_binop_logic_and;
|
||
else
|
||
join_op = ir_binop_logic_or;
|
||
|
||
switch (op0->type->base_type) {
|
||
case GLSL_TYPE_FLOAT:
|
||
case GLSL_TYPE_UINT:
|
||
case GLSL_TYPE_INT:
|
||
case GLSL_TYPE_BOOL:
|
||
return new(mem_ctx) ir_expression(operation, op0, op1);
|
||
|
||
case GLSL_TYPE_ARRAY: {
|
||
for (unsigned int i = 0; i < op0->type->length; i++) {
|
||
ir_rvalue *e0, *e1, *result;
|
||
|
||
e0 = new(mem_ctx) ir_dereference_array(op0->clone(mem_ctx, NULL),
|
||
new(mem_ctx) ir_constant(i));
|
||
e1 = new(mem_ctx) ir_dereference_array(op1->clone(mem_ctx, NULL),
|
||
new(mem_ctx) ir_constant(i));
|
||
result = do_comparison(mem_ctx, operation, e0, e1);
|
||
|
||
if (cmp) {
|
||
cmp = new(mem_ctx) ir_expression(join_op, cmp, result);
|
||
} else {
|
||
cmp = result;
|
||
}
|
||
}
|
||
|
||
mark_whole_array_access(op0);
|
||
mark_whole_array_access(op1);
|
||
break;
|
||
}
|
||
|
||
case GLSL_TYPE_STRUCT: {
|
||
for (unsigned int i = 0; i < op0->type->length; i++) {
|
||
ir_rvalue *e0, *e1, *result;
|
||
const char *field_name = op0->type->fields.structure[i].name;
|
||
|
||
e0 = new(mem_ctx) ir_dereference_record(op0->clone(mem_ctx, NULL),
|
||
field_name);
|
||
e1 = new(mem_ctx) ir_dereference_record(op1->clone(mem_ctx, NULL),
|
||
field_name);
|
||
result = do_comparison(mem_ctx, operation, e0, e1);
|
||
|
||
if (cmp) {
|
||
cmp = new(mem_ctx) ir_expression(join_op, cmp, result);
|
||
} else {
|
||
cmp = result;
|
||
}
|
||
}
|
||
break;
|
||
}
|
||
|
||
case GLSL_TYPE_ERROR:
|
||
case GLSL_TYPE_VOID:
|
||
case GLSL_TYPE_SAMPLER:
|
||
case GLSL_TYPE_IMAGE:
|
||
case GLSL_TYPE_INTERFACE:
|
||
case GLSL_TYPE_ATOMIC_UINT:
|
||
/* I assume a comparison of a struct containing a sampler just
|
||
* ignores the sampler present in the type.
|
||
*/
|
||
break;
|
||
}
|
||
|
||
if (cmp == NULL)
|
||
cmp = new(mem_ctx) ir_constant(true);
|
||
|
||
return cmp;
|
||
}
|
||
|
||
/* For logical operations, we want to ensure that the operands are
|
||
* scalar booleans. If it isn't, emit an error and return a constant
|
||
* boolean to avoid triggering cascading error messages.
|
||
*/
|
||
ir_rvalue *
|
||
get_scalar_boolean_operand(exec_list *instructions,
|
||
struct _mesa_glsl_parse_state *state,
|
||
ast_expression *parent_expr,
|
||
int operand,
|
||
const char *operand_name,
|
||
bool *error_emitted)
|
||
{
|
||
ast_expression *expr = parent_expr->subexpressions[operand];
|
||
void *ctx = state;
|
||
ir_rvalue *val = expr->hir(instructions, state);
|
||
|
||
if (val->type->is_boolean() && val->type->is_scalar())
|
||
return val;
|
||
|
||
if (!*error_emitted) {
|
||
YYLTYPE loc = expr->get_location();
|
||
_mesa_glsl_error(&loc, state, "%s of `%s' must be scalar boolean",
|
||
operand_name,
|
||
parent_expr->operator_string(parent_expr->oper));
|
||
*error_emitted = true;
|
||
}
|
||
|
||
return new(ctx) ir_constant(true);
|
||
}
|
||
|
||
/**
|
||
* If name refers to a builtin array whose maximum allowed size is less than
|
||
* size, report an error and return true. Otherwise return false.
|
||
*/
|
||
void
|
||
check_builtin_array_max_size(const char *name, unsigned size,
|
||
YYLTYPE loc, struct _mesa_glsl_parse_state *state)
|
||
{
|
||
if ((strcmp("gl_TexCoord", name) == 0)
|
||
&& (size > state->Const.MaxTextureCoords)) {
|
||
/* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
|
||
*
|
||
* "The size [of gl_TexCoord] can be at most
|
||
* gl_MaxTextureCoords."
|
||
*/
|
||
_mesa_glsl_error(&loc, state, "`gl_TexCoord' array size cannot "
|
||
"be larger than gl_MaxTextureCoords (%u)",
|
||
state->Const.MaxTextureCoords);
|
||
} else if (strcmp("gl_ClipDistance", name) == 0
|
||
&& size > state->Const.MaxClipPlanes) {
|
||
/* From section 7.1 (Vertex Shader Special Variables) of the
|
||
* GLSL 1.30 spec:
|
||
*
|
||
* "The gl_ClipDistance array is predeclared as unsized and
|
||
* must be sized by the shader either redeclaring it with a
|
||
* size or indexing it only with integral constant
|
||
* expressions. ... The size can be at most
|
||
* gl_MaxClipDistances."
|
||
*/
|
||
_mesa_glsl_error(&loc, state, "`gl_ClipDistance' array size cannot "
|
||
"be larger than gl_MaxClipDistances (%u)",
|
||
state->Const.MaxClipPlanes);
|
||
}
|
||
}
|
||
|
||
/**
|
||
* Create the constant 1, of a which is appropriate for incrementing and
|
||
* decrementing values of the given GLSL type. For example, if type is vec4,
|
||
* this creates a constant value of 1.0 having type float.
|
||
*
|
||
* If the given type is invalid for increment and decrement operators, return
|
||
* a floating point 1--the error will be detected later.
|
||
*/
|
||
static ir_rvalue *
|
||
constant_one_for_inc_dec(void *ctx, const glsl_type *type)
|
||
{
|
||
switch (type->base_type) {
|
||
case GLSL_TYPE_UINT:
|
||
return new(ctx) ir_constant((unsigned) 1);
|
||
case GLSL_TYPE_INT:
|
||
return new(ctx) ir_constant(1);
|
||
default:
|
||
case GLSL_TYPE_FLOAT:
|
||
return new(ctx) ir_constant(1.0f);
|
||
}
|
||
}
|
||
|
||
ir_rvalue *
|
||
ast_expression::hir(exec_list *instructions,
|
||
struct _mesa_glsl_parse_state *state)
|
||
{
|
||
return do_hir(instructions, state, true);
|
||
}
|
||
|
||
void
|
||
ast_expression::hir_no_rvalue(exec_list *instructions,
|
||
struct _mesa_glsl_parse_state *state)
|
||
{
|
||
do_hir(instructions, state, false);
|
||
}
|
||
|
||
ir_rvalue *
|
||
ast_expression::do_hir(exec_list *instructions,
|
||
struct _mesa_glsl_parse_state *state,
|
||
bool needs_rvalue)
|
||
{
|
||
void *ctx = state;
|
||
static const int operations[AST_NUM_OPERATORS] = {
|
||
-1, /* ast_assign doesn't convert to ir_expression. */
|
||
-1, /* ast_plus doesn't convert to ir_expression. */
|
||
ir_unop_neg,
|
||
ir_binop_add,
|
||
ir_binop_sub,
|
||
ir_binop_mul,
|
||
ir_binop_div,
|
||
ir_binop_mod,
|
||
ir_binop_lshift,
|
||
ir_binop_rshift,
|
||
ir_binop_less,
|
||
ir_binop_greater,
|
||
ir_binop_lequal,
|
||
ir_binop_gequal,
|
||
ir_binop_all_equal,
|
||
ir_binop_any_nequal,
|
||
ir_binop_bit_and,
|
||
ir_binop_bit_xor,
|
||
ir_binop_bit_or,
|
||
ir_unop_bit_not,
|
||
ir_binop_logic_and,
|
||
ir_binop_logic_xor,
|
||
ir_binop_logic_or,
|
||
ir_unop_logic_not,
|
||
|
||
/* Note: The following block of expression types actually convert
|
||
* to multiple IR instructions.
|
||
*/
|
||
ir_binop_mul, /* ast_mul_assign */
|
||
ir_binop_div, /* ast_div_assign */
|
||
ir_binop_mod, /* ast_mod_assign */
|
||
ir_binop_add, /* ast_add_assign */
|
||
ir_binop_sub, /* ast_sub_assign */
|
||
ir_binop_lshift, /* ast_ls_assign */
|
||
ir_binop_rshift, /* ast_rs_assign */
|
||
ir_binop_bit_and, /* ast_and_assign */
|
||
ir_binop_bit_xor, /* ast_xor_assign */
|
||
ir_binop_bit_or, /* ast_or_assign */
|
||
|
||
-1, /* ast_conditional doesn't convert to ir_expression. */
|
||
ir_binop_add, /* ast_pre_inc. */
|
||
ir_binop_sub, /* ast_pre_dec. */
|
||
ir_binop_add, /* ast_post_inc. */
|
||
ir_binop_sub, /* ast_post_dec. */
|
||
-1, /* ast_field_selection doesn't conv to ir_expression. */
|
||
-1, /* ast_array_index doesn't convert to ir_expression. */
|
||
-1, /* ast_function_call doesn't conv to ir_expression. */
|
||
-1, /* ast_identifier doesn't convert to ir_expression. */
|
||
-1, /* ast_int_constant doesn't convert to ir_expression. */
|
||
-1, /* ast_uint_constant doesn't conv to ir_expression. */
|
||
-1, /* ast_float_constant doesn't conv to ir_expression. */
|
||
-1, /* ast_bool_constant doesn't conv to ir_expression. */
|
||
-1, /* ast_sequence doesn't convert to ir_expression. */
|
||
};
|
||
ir_rvalue *result = NULL;
|
||
ir_rvalue *op[3];
|
||
const struct glsl_type *type; /* a temporary variable for switch cases */
|
||
bool error_emitted = false;
|
||
YYLTYPE loc;
|
||
|
||
loc = this->get_location();
|
||
|
||
switch (this->oper) {
|
||
case ast_aggregate:
|
||
assert(!"ast_aggregate: Should never get here.");
|
||
break;
|
||
|
||
case ast_assign: {
|
||
op[0] = this->subexpressions[0]->hir(instructions, state);
|
||
op[1] = this->subexpressions[1]->hir(instructions, state);
|
||
|
||
error_emitted =
|
||
do_assignment(instructions, state,
|
||
this->subexpressions[0]->non_lvalue_description,
|
||
op[0], op[1], &result, needs_rvalue, false,
|
||
this->subexpressions[0]->get_location());
|
||
break;
|
||
}
|
||
|
||
case ast_plus:
|
||
op[0] = this->subexpressions[0]->hir(instructions, state);
|
||
|
||
type = unary_arithmetic_result_type(op[0]->type, state, & loc);
|
||
|
||
error_emitted = type->is_error();
|
||
|
||
result = op[0];
|
||
break;
|
||
|
||
case ast_neg:
|
||
op[0] = this->subexpressions[0]->hir(instructions, state);
|
||
|
||
type = unary_arithmetic_result_type(op[0]->type, state, & loc);
|
||
|
||
error_emitted = type->is_error();
|
||
|
||
result = new(ctx) ir_expression(operations[this->oper], type,
|
||
op[0], NULL);
|
||
break;
|
||
|
||
case ast_add:
|
||
case ast_sub:
|
||
case ast_mul:
|
||
case ast_div:
|
||
op[0] = this->subexpressions[0]->hir(instructions, state);
|
||
op[1] = this->subexpressions[1]->hir(instructions, state);
|
||
|
||
type = arithmetic_result_type(op[0], op[1],
|
||
(this->oper == ast_mul),
|
||
state, & loc);
|
||
error_emitted = type->is_error();
|
||
|
||
result = new(ctx) ir_expression(operations[this->oper], type,
|
||
op[0], op[1]);
|
||
break;
|
||
|
||
case ast_mod:
|
||
op[0] = this->subexpressions[0]->hir(instructions, state);
|
||
op[1] = this->subexpressions[1]->hir(instructions, state);
|
||
|
||
type = modulus_result_type(op[0]->type, op[1]->type, state, & loc);
|
||
|
||
assert(operations[this->oper] == ir_binop_mod);
|
||
|
||
result = new(ctx) ir_expression(operations[this->oper], type,
|
||
op[0], op[1]);
|
||
error_emitted = type->is_error();
|
||
break;
|
||
|
||
case ast_lshift:
|
||
case ast_rshift:
|
||
if (!state->check_bitwise_operations_allowed(&loc)) {
|
||
error_emitted = true;
|
||
}
|
||
|
||
op[0] = this->subexpressions[0]->hir(instructions, state);
|
||
op[1] = this->subexpressions[1]->hir(instructions, state);
|
||
type = shift_result_type(op[0]->type, op[1]->type, this->oper, state,
|
||
&loc);
|
||
result = new(ctx) ir_expression(operations[this->oper], type,
|
||
op[0], op[1]);
|
||
error_emitted = op[0]->type->is_error() || op[1]->type->is_error();
|
||
break;
|
||
|
||
case ast_less:
|
||
case ast_greater:
|
||
case ast_lequal:
|
||
case ast_gequal:
|
||
op[0] = this->subexpressions[0]->hir(instructions, state);
|
||
op[1] = this->subexpressions[1]->hir(instructions, state);
|
||
|
||
type = relational_result_type(op[0], op[1], state, & loc);
|
||
|
||
/* The relational operators must either generate an error or result
|
||
* in a scalar boolean. See page 57 of the GLSL 1.50 spec.
|
||
*/
|
||
assert(type->is_error()
|
||
|| ((type->base_type == GLSL_TYPE_BOOL)
|
||
&& type->is_scalar()));
|
||
|
||
result = new(ctx) ir_expression(operations[this->oper], type,
|
||
op[0], op[1]);
|
||
error_emitted = type->is_error();
|
||
break;
|
||
|
||
case ast_nequal:
|
||
case ast_equal:
|
||
op[0] = this->subexpressions[0]->hir(instructions, state);
|
||
op[1] = this->subexpressions[1]->hir(instructions, state);
|
||
|
||
/* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
|
||
*
|
||
* "The equality operators equal (==), and not equal (!=)
|
||
* operate on all types. They result in a scalar Boolean. If
|
||
* the operand types do not match, then there must be a
|
||
* conversion from Section 4.1.10 "Implicit Conversions"
|
||
* applied to one operand that can make them match, in which
|
||
* case this conversion is done."
|
||
*/
|
||
if ((!apply_implicit_conversion(op[0]->type, op[1], state)
|
||
&& !apply_implicit_conversion(op[1]->type, op[0], state))
|
||
|| (op[0]->type != op[1]->type)) {
|
||
_mesa_glsl_error(& loc, state, "operands of `%s' must have the same "
|
||
"type", (this->oper == ast_equal) ? "==" : "!=");
|
||
error_emitted = true;
|
||
} else if ((op[0]->type->is_array() || op[1]->type->is_array()) &&
|
||
!state->check_version(120, 300, &loc,
|
||
"array comparisons forbidden")) {
|
||
error_emitted = true;
|
||
} else if ((op[0]->type->contains_opaque() ||
|
||
op[1]->type->contains_opaque())) {
|
||
_mesa_glsl_error(&loc, state, "opaque type comparisons forbidden");
|
||
error_emitted = true;
|
||
}
|
||
|
||
if (error_emitted) {
|
||
result = new(ctx) ir_constant(false);
|
||
} else {
|
||
result = do_comparison(ctx, operations[this->oper], op[0], op[1]);
|
||
assert(result->type == glsl_type::bool_type);
|
||
}
|
||
break;
|
||
|
||
case ast_bit_and:
|
||
case ast_bit_xor:
|
||
case ast_bit_or:
|
||
op[0] = this->subexpressions[0]->hir(instructions, state);
|
||
op[1] = this->subexpressions[1]->hir(instructions, state);
|
||
|
||
type = bit_logic_result_type(op[0]->type, op[1]->type, this->oper,
|
||
state, &loc);
|
||
result = new(ctx) ir_expression(operations[this->oper], type,
|
||
op[0], op[1]);
|
||
error_emitted = op[0]->type->is_error() || op[1]->type->is_error();
|
||
break;
|
||
|
||
case ast_bit_not:
|
||
op[0] = this->subexpressions[0]->hir(instructions, state);
|
||
|
||
if (!state->check_bitwise_operations_allowed(&loc)) {
|
||
error_emitted = true;
|
||
}
|
||
|
||
if (!op[0]->type->is_integer()) {
|
||
_mesa_glsl_error(&loc, state, "operand of `~' must be an integer");
|
||
error_emitted = true;
|
||
}
|
||
|
||
type = error_emitted ? glsl_type::error_type : op[0]->type;
|
||
result = new(ctx) ir_expression(ir_unop_bit_not, type, op[0], NULL);
|
||
break;
|
||
|
||
case ast_logic_and: {
|
||
exec_list rhs_instructions;
|
||
op[0] = get_scalar_boolean_operand(instructions, state, this, 0,
|
||
"LHS", &error_emitted);
|
||
op[1] = get_scalar_boolean_operand(&rhs_instructions, state, this, 1,
|
||
"RHS", &error_emitted);
|
||
|
||
if (rhs_instructions.is_empty()) {
|
||
result = new(ctx) ir_expression(ir_binop_logic_and, op[0], op[1]);
|
||
type = result->type;
|
||
} else {
|
||
ir_variable *const tmp = new(ctx) ir_variable(glsl_type::bool_type,
|
||
"and_tmp",
|
||
ir_var_temporary, glsl_precision_low);
|
||
instructions->push_tail(tmp);
|
||
|
||
ir_if *const stmt = new(ctx) ir_if(op[0]);
|
||
instructions->push_tail(stmt);
|
||
|
||
stmt->then_instructions.append_list(&rhs_instructions);
|
||
ir_dereference *const then_deref = new(ctx) ir_dereference_variable(tmp);
|
||
ir_assignment *const then_assign =
|
||
new(ctx) ir_assignment(then_deref, op[1]);
|
||
stmt->then_instructions.push_tail(then_assign);
|
||
|
||
ir_dereference *const else_deref = new(ctx) ir_dereference_variable(tmp);
|
||
ir_assignment *const else_assign =
|
||
new(ctx) ir_assignment(else_deref, new(ctx) ir_constant(false));
|
||
stmt->else_instructions.push_tail(else_assign);
|
||
|
||
result = new(ctx) ir_dereference_variable(tmp);
|
||
type = tmp->type;
|
||
}
|
||
break;
|
||
}
|
||
|
||
case ast_logic_or: {
|
||
exec_list rhs_instructions;
|
||
op[0] = get_scalar_boolean_operand(instructions, state, this, 0,
|
||
"LHS", &error_emitted);
|
||
op[1] = get_scalar_boolean_operand(&rhs_instructions, state, this, 1,
|
||
"RHS", &error_emitted);
|
||
|
||
if (rhs_instructions.is_empty()) {
|
||
result = new(ctx) ir_expression(ir_binop_logic_or, op[0], op[1]);
|
||
type = result->type;
|
||
} else {
|
||
ir_variable *const tmp = new(ctx) ir_variable(glsl_type::bool_type,
|
||
"or_tmp",
|
||
ir_var_temporary, glsl_precision_low);
|
||
instructions->push_tail(tmp);
|
||
|
||
ir_if *const stmt = new(ctx) ir_if(op[0]);
|
||
instructions->push_tail(stmt);
|
||
|
||
ir_dereference *const then_deref = new(ctx) ir_dereference_variable(tmp);
|
||
ir_assignment *const then_assign =
|
||
new(ctx) ir_assignment(then_deref, new(ctx) ir_constant(true));
|
||
stmt->then_instructions.push_tail(then_assign);
|
||
|
||
stmt->else_instructions.append_list(&rhs_instructions);
|
||
ir_dereference *const else_deref = new(ctx) ir_dereference_variable(tmp);
|
||
ir_assignment *const else_assign =
|
||
new(ctx) ir_assignment(else_deref, op[1]);
|
||
stmt->else_instructions.push_tail(else_assign);
|
||
|
||
result = new(ctx) ir_dereference_variable(tmp);
|
||
type = tmp->type;
|
||
}
|
||
break;
|
||
}
|
||
|
||
case ast_logic_xor:
|
||
/* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
|
||
*
|
||
* "The logical binary operators and (&&), or ( | | ), and
|
||
* exclusive or (^^). They operate only on two Boolean
|
||
* expressions and result in a Boolean expression."
|
||
*/
|
||
op[0] = get_scalar_boolean_operand(instructions, state, this, 0, "LHS",
|
||
&error_emitted);
|
||
op[1] = get_scalar_boolean_operand(instructions, state, this, 1, "RHS",
|
||
&error_emitted);
|
||
|
||
result = new(ctx) ir_expression(operations[this->oper], glsl_type::bool_type,
|
||
op[0], op[1]);
|
||
break;
|
||
|
||
case ast_logic_not:
|
||
op[0] = get_scalar_boolean_operand(instructions, state, this, 0,
|
||
"operand", &error_emitted);
|
||
|
||
result = new(ctx) ir_expression(operations[this->oper], glsl_type::bool_type,
|
||
op[0], NULL);
|
||
break;
|
||
|
||
case ast_mul_assign:
|
||
case ast_div_assign:
|
||
case ast_add_assign:
|
||
case ast_sub_assign: {
|
||
op[0] = this->subexpressions[0]->hir(instructions, state);
|
||
op[1] = this->subexpressions[1]->hir(instructions, state);
|
||
|
||
type = arithmetic_result_type(op[0], op[1],
|
||
(this->oper == ast_mul_assign),
|
||
state, & loc);
|
||
|
||
ir_rvalue *temp_rhs = new(ctx) ir_expression(operations[this->oper], type,
|
||
op[0], op[1]);
|
||
|
||
error_emitted =
|
||
do_assignment(instructions, state,
|
||
this->subexpressions[0]->non_lvalue_description,
|
||
op[0]->clone(ctx, NULL), temp_rhs,
|
||
&result, needs_rvalue, false,
|
||
this->subexpressions[0]->get_location());
|
||
|
||
/* GLSL 1.10 does not allow array assignment. However, we don't have to
|
||
* explicitly test for this because none of the binary expression
|
||
* operators allow array operands either.
|
||
*/
|
||
|
||
break;
|
||
}
|
||
|
||
case ast_mod_assign: {
|
||
op[0] = this->subexpressions[0]->hir(instructions, state);
|
||
op[1] = this->subexpressions[1]->hir(instructions, state);
|
||
|
||
type = modulus_result_type(op[0]->type, op[1]->type, state, & loc);
|
||
|
||
assert(operations[this->oper] == ir_binop_mod);
|
||
|
||
ir_rvalue *temp_rhs;
|
||
temp_rhs = new(ctx) ir_expression(operations[this->oper], type,
|
||
op[0], op[1]);
|
||
|
||
error_emitted =
|
||
do_assignment(instructions, state,
|
||
this->subexpressions[0]->non_lvalue_description,
|
||
op[0]->clone(ctx, NULL), temp_rhs,
|
||
&result, needs_rvalue, false,
|
||
this->subexpressions[0]->get_location());
|
||
break;
|
||
}
|
||
|
||
case ast_ls_assign:
|
||
case ast_rs_assign: {
|
||
op[0] = this->subexpressions[0]->hir(instructions, state);
|
||
op[1] = this->subexpressions[1]->hir(instructions, state);
|
||
type = shift_result_type(op[0]->type, op[1]->type, this->oper, state,
|
||
&loc);
|
||
ir_rvalue *temp_rhs = new(ctx) ir_expression(operations[this->oper],
|
||
type, op[0], op[1]);
|
||
error_emitted =
|
||
do_assignment(instructions, state,
|
||
this->subexpressions[0]->non_lvalue_description,
|
||
op[0]->clone(ctx, NULL), temp_rhs,
|
||
&result, needs_rvalue, false,
|
||
this->subexpressions[0]->get_location());
|
||
break;
|
||
}
|
||
|
||
case ast_and_assign:
|
||
case ast_xor_assign:
|
||
case ast_or_assign: {
|
||
op[0] = this->subexpressions[0]->hir(instructions, state);
|
||
op[1] = this->subexpressions[1]->hir(instructions, state);
|
||
type = bit_logic_result_type(op[0]->type, op[1]->type, this->oper,
|
||
state, &loc);
|
||
ir_rvalue *temp_rhs = new(ctx) ir_expression(operations[this->oper],
|
||
type, op[0], op[1]);
|
||
error_emitted =
|
||
do_assignment(instructions, state,
|
||
this->subexpressions[0]->non_lvalue_description,
|
||
op[0]->clone(ctx, NULL), temp_rhs,
|
||
&result, needs_rvalue, false,
|
||
this->subexpressions[0]->get_location());
|
||
break;
|
||
}
|
||
|
||
case ast_conditional: {
|
||
/* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
|
||
*
|
||
* "The ternary selection operator (?:). It operates on three
|
||
* expressions (exp1 ? exp2 : exp3). This operator evaluates the
|
||
* first expression, which must result in a scalar Boolean."
|
||
*/
|
||
op[0] = get_scalar_boolean_operand(instructions, state, this, 0,
|
||
"condition", &error_emitted);
|
||
|
||
/* The :? operator is implemented by generating an anonymous temporary
|
||
* followed by an if-statement. The last instruction in each branch of
|
||
* the if-statement assigns a value to the anonymous temporary. This
|
||
* temporary is the r-value of the expression.
|
||
*/
|
||
exec_list then_instructions;
|
||
exec_list else_instructions;
|
||
|
||
op[1] = this->subexpressions[1]->hir(&then_instructions, state);
|
||
op[2] = this->subexpressions[2]->hir(&else_instructions, state);
|
||
|
||
/* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
|
||
*
|
||
* "The second and third expressions can be any type, as
|
||
* long their types match, or there is a conversion in
|
||
* Section 4.1.10 "Implicit Conversions" that can be applied
|
||
* to one of the expressions to make their types match. This
|
||
* resulting matching type is the type of the entire
|
||
* expression."
|
||
*/
|
||
if ((!apply_implicit_conversion(op[1]->type, op[2], state)
|
||
&& !apply_implicit_conversion(op[2]->type, op[1], state))
|
||
|| (op[1]->type != op[2]->type)) {
|
||
YYLTYPE loc = this->subexpressions[1]->get_location();
|
||
|
||
_mesa_glsl_error(& loc, state, "second and third operands of ?: "
|
||
"operator must have matching types");
|
||
error_emitted = true;
|
||
type = glsl_type::error_type;
|
||
} else {
|
||
type = op[1]->type;
|
||
}
|
||
|
||
/* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
|
||
*
|
||
* "The second and third expressions must be the same type, but can
|
||
* be of any type other than an array."
|
||
*/
|
||
if (type->is_array() &&
|
||
!state->check_version(120, 300, &loc,
|
||
"second and third operands of ?: operator "
|
||
"cannot be arrays")) {
|
||
error_emitted = true;
|
||
}
|
||
|
||
ir_constant *cond_val = op[0]->constant_expression_value();
|
||
ir_constant *then_val = op[1]->constant_expression_value();
|
||
ir_constant *else_val = op[2]->constant_expression_value();
|
||
|
||
if (then_instructions.is_empty()
|
||
&& else_instructions.is_empty()
|
||
&& (cond_val != NULL) && (then_val != NULL) && (else_val != NULL)) {
|
||
result = (cond_val->value.b[0]) ? then_val : else_val;
|
||
} else {
|
||
ir_variable *const tmp =
|
||
new(ctx) ir_variable(type, "conditional_tmp", ir_var_temporary, higher_precision(op[1], op[2]));
|
||
instructions->push_tail(tmp);
|
||
|
||
ir_if *const stmt = new(ctx) ir_if(op[0]);
|
||
instructions->push_tail(stmt);
|
||
|
||
then_instructions.move_nodes_to(& stmt->then_instructions);
|
||
ir_dereference *const then_deref =
|
||
new(ctx) ir_dereference_variable(tmp);
|
||
ir_assignment *const then_assign =
|
||
new(ctx) ir_assignment(then_deref, op[1]);
|
||
stmt->then_instructions.push_tail(then_assign);
|
||
|
||
else_instructions.move_nodes_to(& stmt->else_instructions);
|
||
ir_dereference *const else_deref =
|
||
new(ctx) ir_dereference_variable(tmp);
|
||
ir_assignment *const else_assign =
|
||
new(ctx) ir_assignment(else_deref, op[2]);
|
||
stmt->else_instructions.push_tail(else_assign);
|
||
|
||
result = new(ctx) ir_dereference_variable(tmp);
|
||
}
|
||
break;
|
||
}
|
||
|
||
case ast_pre_inc:
|
||
case ast_pre_dec: {
|
||
this->non_lvalue_description = (this->oper == ast_pre_inc)
|
||
? "pre-increment operation" : "pre-decrement operation";
|
||
|
||
op[0] = this->subexpressions[0]->hir(instructions, state);
|
||
op[1] = constant_one_for_inc_dec(ctx, op[0]->type);
|
||
|
||
type = arithmetic_result_type(op[0], op[1], false, state, & loc);
|
||
|
||
ir_rvalue *temp_rhs;
|
||
temp_rhs = new(ctx) ir_expression(operations[this->oper], type,
|
||
op[0], op[1]);
|
||
|
||
error_emitted =
|
||
do_assignment(instructions, state,
|
||
this->subexpressions[0]->non_lvalue_description,
|
||
op[0]->clone(ctx, NULL), temp_rhs,
|
||
&result, needs_rvalue, false,
|
||
this->subexpressions[0]->get_location());
|
||
break;
|
||
}
|
||
|
||
case ast_post_inc:
|
||
case ast_post_dec: {
|
||
this->non_lvalue_description = (this->oper == ast_post_inc)
|
||
? "post-increment operation" : "post-decrement operation";
|
||
op[0] = this->subexpressions[0]->hir(instructions, state);
|
||
op[1] = constant_one_for_inc_dec(ctx, op[0]->type);
|
||
|
||
error_emitted = op[0]->type->is_error() || op[1]->type->is_error();
|
||
|
||
type = arithmetic_result_type(op[0], op[1], false, state, & loc);
|
||
|
||
ir_rvalue *temp_rhs;
|
||
temp_rhs = new(ctx) ir_expression(operations[this->oper], type,
|
||
op[0], op[1]);
|
||
|
||
/* Get a temporary of a copy of the lvalue before it's modified.
|
||
* This may get thrown away later.
|
||
*/
|
||
result = get_lvalue_copy(instructions, op[0]->clone(ctx, NULL));
|
||
|
||
ir_rvalue *junk_rvalue;
|
||
error_emitted =
|
||
do_assignment(instructions, state,
|
||
this->subexpressions[0]->non_lvalue_description,
|
||
op[0]->clone(ctx, NULL), temp_rhs,
|
||
&junk_rvalue, false, false,
|
||
this->subexpressions[0]->get_location());
|
||
|
||
break;
|
||
}
|
||
|
||
case ast_field_selection:
|
||
result = _mesa_ast_field_selection_to_hir(this, instructions, state);
|
||
break;
|
||
|
||
case ast_array_index: {
|
||
YYLTYPE index_loc = subexpressions[1]->get_location();
|
||
|
||
op[0] = subexpressions[0]->hir(instructions, state);
|
||
op[1] = subexpressions[1]->hir(instructions, state);
|
||
|
||
result = _mesa_ast_array_index_to_hir(ctx, state, op[0], op[1],
|
||
loc, index_loc);
|
||
|
||
if (result->type->is_error())
|
||
error_emitted = true;
|
||
|
||
break;
|
||
}
|
||
|
||
case ast_function_call:
|
||
/* Should *NEVER* get here. ast_function_call should always be handled
|
||
* by ast_function_expression::hir.
|
||
*/
|
||
assert(0);
|
||
break;
|
||
|
||
case ast_identifier: {
|
||
/* ast_identifier can appear several places in a full abstract syntax
|
||
* tree. This particular use must be at location specified in the grammar
|
||
* as 'variable_identifier'.
|
||
*/
|
||
ir_variable *var =
|
||
state->symbols->get_variable(this->primary_expression.identifier);
|
||
|
||
if (var != NULL) {
|
||
var->data.used = true;
|
||
result = new(ctx) ir_dereference_variable(var);
|
||
} else {
|
||
_mesa_glsl_error(& loc, state, "`%s' undeclared",
|
||
this->primary_expression.identifier);
|
||
|
||
result = ir_rvalue::error_value(ctx);
|
||
error_emitted = true;
|
||
}
|
||
break;
|
||
}
|
||
|
||
case ast_int_constant:
|
||
result = new(ctx) ir_constant(this->primary_expression.int_constant);
|
||
break;
|
||
|
||
case ast_uint_constant:
|
||
result = new(ctx) ir_constant(this->primary_expression.uint_constant);
|
||
break;
|
||
|
||
case ast_float_constant:
|
||
result = new(ctx) ir_constant(this->primary_expression.float_constant);
|
||
break;
|
||
|
||
case ast_bool_constant:
|
||
result = new(ctx) ir_constant(bool(!!this->primary_expression.bool_constant));
|
||
break;
|
||
|
||
case ast_sequence: {
|
||
/* It should not be possible to generate a sequence in the AST without
|
||
* any expressions in it.
|
||
*/
|
||
assert(!this->expressions.is_empty());
|
||
|
||
/* The r-value of a sequence is the last expression in the sequence. If
|
||
* the other expressions in the sequence do not have side-effects (and
|
||
* therefore add instructions to the instruction list), they get dropped
|
||
* on the floor.
|
||
*/
|
||
exec_node *previous_tail_pred = NULL;
|
||
YYLTYPE previous_operand_loc = loc;
|
||
|
||
foreach_list_typed (ast_node, ast, link, &this->expressions) {
|
||
/* If one of the operands of comma operator does not generate any
|
||
* code, we want to emit a warning. At each pass through the loop
|
||
* previous_tail_pred will point to the last instruction in the
|
||
* stream *before* processing the previous operand. Naturally,
|
||
* instructions->tail_pred will point to the last instruction in the
|
||
* stream *after* processing the previous operand. If the two
|
||
* pointers match, then the previous operand had no effect.
|
||
*
|
||
* The warning behavior here differs slightly from GCC. GCC will
|
||
* only emit a warning if none of the left-hand operands have an
|
||
* effect. However, it will emit a warning for each. I believe that
|
||
* there are some cases in C (especially with GCC extensions) where
|
||
* it is useful to have an intermediate step in a sequence have no
|
||
* effect, but I don't think these cases exist in GLSL. Either way,
|
||
* it would be a giant hassle to replicate that behavior.
|
||
*/
|
||
if (previous_tail_pred == instructions->tail_pred) {
|
||
_mesa_glsl_warning(&previous_operand_loc, state,
|
||
"left-hand operand of comma expression has "
|
||
"no effect");
|
||
}
|
||
|
||
/* tail_pred is directly accessed instead of using the get_tail()
|
||
* method for performance reasons. get_tail() has extra code to
|
||
* return NULL when the list is empty. We don't care about that
|
||
* here, so using tail_pred directly is fine.
|
||
*/
|
||
previous_tail_pred = instructions->tail_pred;
|
||
previous_operand_loc = ast->get_location();
|
||
|
||
result = ast->hir(instructions, state);
|
||
}
|
||
|
||
/* Any errors should have already been emitted in the loop above.
|
||
*/
|
||
error_emitted = true;
|
||
break;
|
||
}
|
||
}
|
||
type = NULL; /* use result->type, not type. */
|
||
assert(result != NULL || !needs_rvalue);
|
||
|
||
if (result && result->type->is_error() && !error_emitted)
|
||
_mesa_glsl_error(& loc, state, "type mismatch");
|
||
|
||
return result;
|
||
}
|
||
|
||
|
||
ir_rvalue *
|
||
ast_expression_statement::hir(exec_list *instructions,
|
||
struct _mesa_glsl_parse_state *state)
|
||
{
|
||
/* It is possible to have expression statements that don't have an
|
||
* expression. This is the solitary semicolon:
|
||
*
|
||
* for (i = 0; i < 5; i++)
|
||
* ;
|
||
*
|
||
* In this case the expression will be NULL. Test for NULL and don't do
|
||
* anything in that case.
|
||
*/
|
||
if (expression != NULL)
|
||
expression->hir_no_rvalue(instructions, state);
|
||
|
||
/* Statements do not have r-values.
|
||
*/
|
||
return NULL;
|
||
}
|
||
|
||
|
||
ir_rvalue *
|
||
ast_compound_statement::hir(exec_list *instructions,
|
||
struct _mesa_glsl_parse_state *state)
|
||
{
|
||
if (new_scope)
|
||
state->symbols->push_scope();
|
||
|
||
foreach_list_typed (ast_node, ast, link, &this->statements)
|
||
ast->hir(instructions, state);
|
||
|
||
if (new_scope)
|
||
state->symbols->pop_scope();
|
||
|
||
/* Compound statements do not have r-values.
|
||
*/
|
||
return NULL;
|
||
}
|
||
|
||
/**
|
||
* Evaluate the given exec_node (which should be an ast_node representing
|
||
* a single array dimension) and return its integer value.
|
||
*/
|
||
static unsigned
|
||
process_array_size(exec_node *node,
|
||
struct _mesa_glsl_parse_state *state)
|
||
{
|
||
exec_list dummy_instructions;
|
||
|
||
ast_node *array_size = exec_node_data(ast_node, node, link);
|
||
ir_rvalue *const ir = array_size->hir(& dummy_instructions, state);
|
||
YYLTYPE loc = array_size->get_location();
|
||
|
||
if (ir == NULL) {
|
||
_mesa_glsl_error(& loc, state,
|
||
"array size could not be resolved");
|
||
return 0;
|
||
}
|
||
|
||
if (!ir->type->is_integer()) {
|
||
_mesa_glsl_error(& loc, state,
|
||
"array size must be integer type");
|
||
return 0;
|
||
}
|
||
|
||
if (!ir->type->is_scalar()) {
|
||
_mesa_glsl_error(& loc, state,
|
||
"array size must be scalar type");
|
||
return 0;
|
||
}
|
||
|
||
ir_constant *const size = ir->constant_expression_value();
|
||
if (size == NULL) {
|
||
_mesa_glsl_error(& loc, state, "array size must be a "
|
||
"constant valued expression");
|
||
return 0;
|
||
}
|
||
|
||
if (size->value.i[0] <= 0) {
|
||
_mesa_glsl_error(& loc, state, "array size must be > 0");
|
||
return 0;
|
||
}
|
||
|
||
assert(size->type == ir->type);
|
||
|
||
/* If the array size is const (and we've verified that
|
||
* it is) then no instructions should have been emitted
|
||
* when we converted it to HIR. If they were emitted,
|
||
* then either the array size isn't const after all, or
|
||
* we are emitting unnecessary instructions.
|
||
*/
|
||
assert(dummy_instructions.is_empty());
|
||
|
||
return size->value.u[0];
|
||
}
|
||
|
||
static const glsl_type *
|
||
process_array_type(YYLTYPE *loc, const glsl_type *base,
|
||
ast_array_specifier *array_specifier,
|
||
struct _mesa_glsl_parse_state *state)
|
||
{
|
||
const glsl_type *array_type = base;
|
||
|
||
if (array_specifier != NULL) {
|
||
if (base->is_array()) {
|
||
|
||
/* From page 19 (page 25) of the GLSL 1.20 spec:
|
||
*
|
||
* "Only one-dimensional arrays may be declared."
|
||
*/
|
||
if (!state->ARB_arrays_of_arrays_enable) {
|
||
_mesa_glsl_error(loc, state,
|
||
"invalid array of `%s'"
|
||
"GL_ARB_arrays_of_arrays "
|
||
"required for defining arrays of arrays",
|
||
base->name);
|
||
return glsl_type::error_type;
|
||
}
|
||
|
||
if (base->length == 0) {
|
||
_mesa_glsl_error(loc, state,
|
||
"only the outermost array dimension can "
|
||
"be unsized",
|
||
base->name);
|
||
return glsl_type::error_type;
|
||
}
|
||
}
|
||
|
||
for (exec_node *node = array_specifier->array_dimensions.tail_pred;
|
||
!node->is_head_sentinel(); node = node->prev) {
|
||
unsigned array_size = process_array_size(node, state);
|
||
array_type = glsl_type::get_array_instance(array_type, array_size);
|
||
}
|
||
|
||
if (array_specifier->is_unsized_array)
|
||
array_type = glsl_type::get_array_instance(array_type, 0);
|
||
}
|
||
|
||
return array_type;
|
||
}
|
||
|
||
|
||
const glsl_type *
|
||
ast_type_specifier::glsl_type(const char **name,
|
||
struct _mesa_glsl_parse_state *state) const
|
||
{
|
||
const struct glsl_type *type;
|
||
|
||
type = state->symbols->get_type(this->type_name);
|
||
*name = this->type_name;
|
||
|
||
YYLTYPE loc = this->get_location();
|
||
type = process_array_type(&loc, type, this->array_specifier, state);
|
||
|
||
return type;
|
||
}
|
||
|
||
const glsl_type *
|
||
ast_fully_specified_type::glsl_type(const char **name,
|
||
struct _mesa_glsl_parse_state *state) const
|
||
{
|
||
const struct glsl_type *type = this->specifier->glsl_type(name, state);
|
||
|
||
if (type == NULL)
|
||
return NULL;
|
||
|
||
/* GLSL Optimizer change: do allow unspecified precision; hlsl2glsl
|
||
produces a bunch of wrapper functions without precision specified.
|
||
|
||
if (type->base_type == GLSL_TYPE_FLOAT
|
||
&& state->es_shader
|
||
&& state->stage == MESA_SHADER_FRAGMENT
|
||
&& this->qualifier.precision == ast_precision_none
|
||
&& state->symbols->get_variable("#default precision") == NULL) {
|
||
YYLTYPE loc = this->get_location();
|
||
_mesa_glsl_error(&loc, state,
|
||
"no precision specified this scope for type `%s'",
|
||
type->name);
|
||
}
|
||
*/
|
||
|
||
return type;
|
||
}
|
||
|
||
/**
|
||
* Determine whether a toplevel variable declaration declares a varying. This
|
||
* function operates by examining the variable's mode and the shader target,
|
||
* so it correctly identifies linkage variables regardless of whether they are
|
||
* declared using the deprecated "varying" syntax or the new "in/out" syntax.
|
||
*
|
||
* Passing a non-toplevel variable declaration (e.g. a function parameter) to
|
||
* this function will produce undefined results.
|
||
*/
|
||
static bool
|
||
is_varying_var(ir_variable *var, gl_shader_stage target)
|
||
{
|
||
switch (target) {
|
||
case MESA_SHADER_VERTEX:
|
||
return var->data.mode == ir_var_shader_out;
|
||
case MESA_SHADER_FRAGMENT:
|
||
return var->data.mode == ir_var_shader_in || var->data.mode == ir_var_shader_inout;
|
||
default:
|
||
return var->data.mode == ir_var_shader_out || var->data.mode == ir_var_shader_in;
|
||
}
|
||
}
|
||
|
||
|
||
/**
|
||
* Matrix layout qualifiers are only allowed on certain types
|
||
*/
|
||
static void
|
||
validate_matrix_layout_for_type(struct _mesa_glsl_parse_state *state,
|
||
YYLTYPE *loc,
|
||
const glsl_type *type,
|
||
ir_variable *var)
|
||
{
|
||
if (var && !var->is_in_uniform_block()) {
|
||
/* Layout qualifiers may only apply to interface blocks and fields in
|
||
* them.
|
||
*/
|
||
_mesa_glsl_error(loc, state,
|
||
"uniform block layout qualifiers row_major and "
|
||
"column_major may not be applied to variables "
|
||
"outside of uniform blocks");
|
||
} else if (!type->is_matrix()) {
|
||
/* The OpenGL ES 3.0 conformance tests did not originally allow
|
||
* matrix layout qualifiers on non-matrices. However, the OpenGL
|
||
* 4.4 and OpenGL ES 3.0 (revision TBD) specifications were
|
||
* amended to specifically allow these layouts on all types. Emit
|
||
* a warning so that people know their code may not be portable.
|
||
*/
|
||
_mesa_glsl_warning(loc, state,
|
||
"uniform block layout qualifiers row_major and "
|
||
"column_major applied to non-matrix types may "
|
||
"be rejected by older compilers");
|
||
} else if (type->is_record()) {
|
||
/* We allow 'layout(row_major)' on structure types because it's the only
|
||
* way to get row-major layouts on matrices contained in structures.
|
||
*/
|
||
_mesa_glsl_warning(loc, state,
|
||
"uniform block layout qualifiers row_major and "
|
||
"column_major applied to structure types is not "
|
||
"strictly conformant and may be rejected by other "
|
||
"compilers");
|
||
}
|
||
}
|
||
|
||
static bool
|
||
validate_binding_qualifier(struct _mesa_glsl_parse_state *state,
|
||
YYLTYPE *loc,
|
||
ir_variable *var,
|
||
const ast_type_qualifier *qual)
|
||
{
|
||
if (var->data.mode != ir_var_uniform) {
|
||
_mesa_glsl_error(loc, state,
|
||
"the \"binding\" qualifier only applies to uniforms");
|
||
return false;
|
||
}
|
||
|
||
if (qual->binding < 0) {
|
||
_mesa_glsl_error(loc, state, "binding values must be >= 0");
|
||
return false;
|
||
}
|
||
|
||
const struct gl_context *const ctx = state->ctx;
|
||
unsigned elements = var->type->is_array() ? var->type->length : 1;
|
||
unsigned max_index = qual->binding + elements - 1;
|
||
|
||
if (var->type->is_interface()) {
|
||
/* UBOs. From page 60 of the GLSL 4.20 specification:
|
||
* "If the binding point for any uniform block instance is less than zero,
|
||
* or greater than or equal to the implementation-dependent maximum
|
||
* number of uniform buffer bindings, a compilation error will occur.
|
||
* When the binding identifier is used with a uniform block instanced as
|
||
* an array of size N, all elements of the array from binding through
|
||
* binding + N – 1 must be within this range."
|
||
*
|
||
* The implementation-dependent maximum is GL_MAX_UNIFORM_BUFFER_BINDINGS.
|
||
*/
|
||
if (max_index >= ctx->Const.MaxUniformBufferBindings) {
|
||
_mesa_glsl_error(loc, state, "layout(binding = %d) for %d UBOs exceeds "
|
||
"the maximum number of UBO binding points (%d)",
|
||
qual->binding, elements,
|
||
ctx->Const.MaxUniformBufferBindings);
|
||
return false;
|
||
}
|
||
} else if (var->type->is_sampler() ||
|
||
(var->type->is_array() && var->type->fields.array->is_sampler())) {
|
||
/* Samplers. From page 63 of the GLSL 4.20 specification:
|
||
* "If the binding is less than zero, or greater than or equal to the
|
||
* implementation-dependent maximum supported number of units, a
|
||
* compilation error will occur. When the binding identifier is used
|
||
* with an array of size N, all elements of the array from binding
|
||
* through binding + N - 1 must be within this range."
|
||
*/
|
||
unsigned limit = ctx->Const.Program[state->stage].MaxTextureImageUnits;
|
||
|
||
if (max_index >= limit) {
|
||
_mesa_glsl_error(loc, state, "layout(binding = %d) for %d samplers "
|
||
"exceeds the maximum number of texture image units "
|
||
"(%d)", qual->binding, elements, limit);
|
||
|
||
return false;
|
||
}
|
||
} else if (var->type->contains_atomic()) {
|
||
assert(ctx->Const.MaxAtomicBufferBindings <= MAX_COMBINED_ATOMIC_BUFFERS);
|
||
if (unsigned(qual->binding) >= ctx->Const.MaxAtomicBufferBindings) {
|
||
_mesa_glsl_error(loc, state, "layout(binding = %d) exceeds the "
|
||
" maximum number of atomic counter buffer bindings"
|
||
"(%d)", qual->binding,
|
||
ctx->Const.MaxAtomicBufferBindings);
|
||
|
||
return false;
|
||
}
|
||
} else {
|
||
_mesa_glsl_error(loc, state,
|
||
"the \"binding\" qualifier only applies to uniform "
|
||
"blocks, samplers, atomic counters, or arrays thereof");
|
||
return false;
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
|
||
static glsl_interp_qualifier
|
||
interpret_interpolation_qualifier(const struct ast_type_qualifier *qual,
|
||
ir_variable_mode mode,
|
||
struct _mesa_glsl_parse_state *state,
|
||
YYLTYPE *loc)
|
||
{
|
||
glsl_interp_qualifier interpolation;
|
||
if (qual->flags.q.flat)
|
||
interpolation = INTERP_QUALIFIER_FLAT;
|
||
else if (qual->flags.q.noperspective)
|
||
interpolation = INTERP_QUALIFIER_NOPERSPECTIVE;
|
||
else if (qual->flags.q.smooth)
|
||
interpolation = INTERP_QUALIFIER_SMOOTH;
|
||
else
|
||
interpolation = INTERP_QUALIFIER_NONE;
|
||
|
||
if (interpolation != INTERP_QUALIFIER_NONE) {
|
||
if (mode != ir_var_shader_in && mode != ir_var_shader_out) {
|
||
_mesa_glsl_error(loc, state,
|
||
"interpolation qualifier `%s' can only be applied to "
|
||
"shader inputs or outputs.",
|
||
interpolation_string(interpolation));
|
||
|
||
}
|
||
|
||
if ((state->stage == MESA_SHADER_VERTEX && mode == ir_var_shader_in) ||
|
||
(state->stage == MESA_SHADER_FRAGMENT && mode == ir_var_shader_out)) {
|
||
_mesa_glsl_error(loc, state,
|
||
"interpolation qualifier `%s' cannot be applied to "
|
||
"vertex shader inputs or fragment shader outputs",
|
||
interpolation_string(interpolation));
|
||
}
|
||
}
|
||
|
||
return interpolation;
|
||
}
|
||
|
||
|
||
static void
|
||
validate_explicit_location(const struct ast_type_qualifier *qual,
|
||
ir_variable *var,
|
||
struct _mesa_glsl_parse_state *state,
|
||
YYLTYPE *loc)
|
||
{
|
||
bool fail = false;
|
||
|
||
/* Checks for GL_ARB_explicit_uniform_location. */
|
||
if (qual->flags.q.uniform) {
|
||
if (!state->check_explicit_uniform_location_allowed(loc, var))
|
||
return;
|
||
|
||
const struct gl_context *const ctx = state->ctx;
|
||
unsigned max_loc = qual->location + var->type->uniform_locations() - 1;
|
||
|
||
/* ARB_explicit_uniform_location specification states:
|
||
*
|
||
* "The explicitly defined locations and the generated locations
|
||
* must be in the range of 0 to MAX_UNIFORM_LOCATIONS minus one."
|
||
*
|
||
* "Valid locations for default-block uniform variable locations
|
||
* are in the range of 0 to the implementation-defined maximum
|
||
* number of uniform locations."
|
||
*/
|
||
if (qual->location < 0) {
|
||
_mesa_glsl_error(loc, state,
|
||
"explicit location < 0 for uniform %s", var->name);
|
||
return;
|
||
}
|
||
|
||
if (max_loc >= ctx->Const.MaxUserAssignableUniformLocations) {
|
||
_mesa_glsl_error(loc, state, "location(s) consumed by uniform %s "
|
||
">= MAX_UNIFORM_LOCATIONS (%u)", var->name,
|
||
ctx->Const.MaxUserAssignableUniformLocations);
|
||
return;
|
||
}
|
||
|
||
var->data.explicit_location = true;
|
||
var->data.location = qual->location;
|
||
return;
|
||
}
|
||
|
||
/* Between GL_ARB_explicit_attrib_location an
|
||
* GL_ARB_separate_shader_objects, the inputs and outputs of any shader
|
||
* stage can be assigned explicit locations. The checking here associates
|
||
* the correct extension with the correct stage's input / output:
|
||
*
|
||
* input output
|
||
* ----- ------
|
||
* vertex explicit_loc sso
|
||
* geometry sso sso
|
||
* fragment sso explicit_loc
|
||
*/
|
||
switch (state->stage) {
|
||
case MESA_SHADER_VERTEX:
|
||
if (var->data.mode == ir_var_shader_in) {
|
||
if (!state->check_explicit_attrib_location_allowed(loc, var))
|
||
return;
|
||
|
||
break;
|
||
}
|
||
|
||
if (var->data.mode == ir_var_shader_out) {
|
||
if (!state->check_separate_shader_objects_allowed(loc, var))
|
||
return;
|
||
|
||
break;
|
||
}
|
||
|
||
fail = true;
|
||
break;
|
||
|
||
case MESA_SHADER_GEOMETRY:
|
||
if (var->data.mode == ir_var_shader_in || var->data.mode == ir_var_shader_out) {
|
||
if (!state->check_separate_shader_objects_allowed(loc, var))
|
||
return;
|
||
|
||
break;
|
||
}
|
||
|
||
fail = true;
|
||
break;
|
||
|
||
case MESA_SHADER_FRAGMENT:
|
||
if (var->data.mode == ir_var_shader_in) {
|
||
if (!state->check_separate_shader_objects_allowed(loc, var))
|
||
return;
|
||
|
||
break;
|
||
}
|
||
|
||
if (var->data.mode == ir_var_shader_out) {
|
||
if (!state->check_explicit_attrib_location_allowed(loc, var))
|
||
return;
|
||
|
||
break;
|
||
}
|
||
// EXT_shader_framebuffer_fetch:
|
||
// ability to use the inout qualifier at global scope
|
||
// in a fragment shader, is optional and must be enabled by
|
||
// #extension GL_EXT_shader_framebuffer_fetch
|
||
if (var->data.mode == ir_var_shader_inout && state->EXT_shader_framebuffer_fetch_enable) {
|
||
break;
|
||
}
|
||
|
||
fail = true;
|
||
break;
|
||
|
||
case MESA_SHADER_COMPUTE:
|
||
_mesa_glsl_error(loc, state,
|
||
"compute shader variables cannot be given "
|
||
"explicit locations");
|
||
return;
|
||
};
|
||
|
||
if (fail) {
|
||
_mesa_glsl_error(loc, state,
|
||
"%s cannot be given an explicit location in %s shader",
|
||
mode_string(var),
|
||
_mesa_shader_stage_to_string(state->stage));
|
||
} else {
|
||
var->data.explicit_location = true;
|
||
|
||
/* This bit of silliness is needed because invalid explicit locations
|
||
* are supposed to be flagged during linking. Small negative values
|
||
* biased by VERT_ATTRIB_GENERIC0 or FRAG_RESULT_DATA0 could alias
|
||
* built-in values (e.g., -16+VERT_ATTRIB_GENERIC0 = VERT_ATTRIB_POS).
|
||
* The linker needs to be able to differentiate these cases. This
|
||
* ensures that negative values stay negative.
|
||
*/
|
||
if (qual->location >= 0) {
|
||
switch (state->stage) {
|
||
case MESA_SHADER_VERTEX:
|
||
var->data.location = (var->data.mode == ir_var_shader_in)
|
||
? (qual->location + VERT_ATTRIB_GENERIC0)
|
||
: (qual->location + VARYING_SLOT_VAR0);
|
||
break;
|
||
|
||
case MESA_SHADER_GEOMETRY:
|
||
var->data.location = qual->location + VARYING_SLOT_VAR0;
|
||
break;
|
||
|
||
case MESA_SHADER_FRAGMENT:
|
||
var->data.location = (var->data.mode == ir_var_shader_out || var->data.mode == ir_var_shader_inout)
|
||
? (qual->location + FRAG_RESULT_DATA0)
|
||
: (qual->location + VARYING_SLOT_VAR0);
|
||
break;
|
||
case MESA_SHADER_COMPUTE:
|
||
assert(!"Unexpected shader type");
|
||
break;
|
||
}
|
||
} else {
|
||
var->data.location = qual->location;
|
||
}
|
||
|
||
if (qual->flags.q.explicit_index) {
|
||
/* From the GLSL 4.30 specification, section 4.4.2 (Output
|
||
* Layout Qualifiers):
|
||
*
|
||
* "It is also a compile-time error if a fragment shader
|
||
* sets a layout index to less than 0 or greater than 1."
|
||
*
|
||
* Older specifications don't mandate a behavior; we take
|
||
* this as a clarification and always generate the error.
|
||
*/
|
||
if (qual->index < 0 || qual->index > 1) {
|
||
_mesa_glsl_error(loc, state,
|
||
"explicit index may only be 0 or 1");
|
||
} else {
|
||
var->data.explicit_index = true;
|
||
var->data.index = qual->index;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
static void
|
||
apply_image_qualifier_to_variable(const struct ast_type_qualifier *qual,
|
||
ir_variable *var,
|
||
struct _mesa_glsl_parse_state *state,
|
||
YYLTYPE *loc)
|
||
{
|
||
const glsl_type *base_type =
|
||
(var->type->is_array() ? var->type->element_type() : var->type);
|
||
|
||
if (base_type->is_image()) {
|
||
if (var->data.mode != ir_var_uniform &&
|
||
var->data.mode != ir_var_function_in) {
|
||
_mesa_glsl_error(loc, state, "image variables may only be declared as "
|
||
"function parameters or uniform-qualified "
|
||
"global variables");
|
||
}
|
||
|
||
var->data.image_read_only |= qual->flags.q.read_only;
|
||
var->data.image_write_only |= qual->flags.q.write_only;
|
||
var->data.image_coherent |= qual->flags.q.coherent;
|
||
var->data.image_volatile |= qual->flags.q._volatile;
|
||
var->data.image_restrict |= qual->flags.q.restrict_flag;
|
||
var->data.read_only = true;
|
||
|
||
if (qual->flags.q.explicit_image_format) {
|
||
if (var->data.mode == ir_var_function_in) {
|
||
_mesa_glsl_error(loc, state, "format qualifiers cannot be "
|
||
"used on image function parameters");
|
||
}
|
||
|
||
if (qual->image_base_type != base_type->sampler_type) {
|
||
_mesa_glsl_error(loc, state, "format qualifier doesn't match the "
|
||
"base data type of the image");
|
||
}
|
||
|
||
var->data.image_format = qual->image_format;
|
||
} else {
|
||
if (var->data.mode == ir_var_uniform && !qual->flags.q.write_only) {
|
||
_mesa_glsl_error(loc, state, "uniforms not qualified with "
|
||
"`writeonly' must have a format layout "
|
||
"qualifier");
|
||
}
|
||
|
||
var->data.image_format = GL_NONE;
|
||
}
|
||
}
|
||
}
|
||
|
||
static inline const char*
|
||
get_layout_qualifier_string(bool origin_upper_left, bool pixel_center_integer)
|
||
{
|
||
if (origin_upper_left && pixel_center_integer)
|
||
return "origin_upper_left, pixel_center_integer";
|
||
else if (origin_upper_left)
|
||
return "origin_upper_left";
|
||
else if (pixel_center_integer)
|
||
return "pixel_center_integer";
|
||
else
|
||
return " ";
|
||
}
|
||
|
||
static inline bool
|
||
is_conflicting_fragcoord_redeclaration(struct _mesa_glsl_parse_state *state,
|
||
const struct ast_type_qualifier *qual)
|
||
{
|
||
/* If gl_FragCoord was previously declared, and the qualifiers were
|
||
* different in any way, return true.
|
||
*/
|
||
if (state->fs_redeclares_gl_fragcoord) {
|
||
return (state->fs_pixel_center_integer != qual->flags.q.pixel_center_integer
|
||
|| state->fs_origin_upper_left != qual->flags.q.origin_upper_left);
|
||
}
|
||
|
||
return false;
|
||
}
|
||
|
||
static void
|
||
apply_type_qualifier_to_variable(const struct ast_type_qualifier *qual,
|
||
ir_variable *var,
|
||
struct _mesa_glsl_parse_state *state,
|
||
YYLTYPE *loc,
|
||
bool is_parameter)
|
||
{
|
||
STATIC_ASSERT(sizeof(qual->flags.q) <= sizeof(qual->flags.i));
|
||
|
||
if (qual->flags.q.invariant) {
|
||
if (var->data.used) {
|
||
_mesa_glsl_error(loc, state,
|
||
"variable `%s' may not be redeclared "
|
||
"`invariant' after being used",
|
||
var->name);
|
||
} else {
|
||
var->data.invariant = 1;
|
||
}
|
||
}
|
||
|
||
if (qual->flags.q.precise) {
|
||
if (var->data.used) {
|
||
_mesa_glsl_error(loc, state,
|
||
"variable `%s' may not be redeclared "
|
||
"`precise' after being used",
|
||
var->name);
|
||
} else {
|
||
var->data.precise = 1;
|
||
}
|
||
}
|
||
|
||
if (qual->flags.q.constant || qual->flags.q.attribute
|
||
|| qual->flags.q.uniform
|
||
|| (qual->flags.q.varying && (state->stage == MESA_SHADER_FRAGMENT)))
|
||
var->data.read_only = 1;
|
||
|
||
if (qual->flags.q.centroid)
|
||
var->data.centroid = 1;
|
||
|
||
if (qual->flags.q.sample)
|
||
var->data.sample = 1;
|
||
|
||
if (state->stage == MESA_SHADER_GEOMETRY &&
|
||
qual->flags.q.out && qual->flags.q.stream) {
|
||
var->data.stream = qual->stream;
|
||
}
|
||
|
||
if (qual->flags.q.attribute && state->stage != MESA_SHADER_VERTEX) {
|
||
var->type = glsl_type::error_type;
|
||
_mesa_glsl_error(loc, state,
|
||
"`attribute' variables may not be declared in the "
|
||
"%s shader",
|
||
_mesa_shader_stage_to_string(state->stage));
|
||
}
|
||
|
||
/* Disallow layout qualifiers which may only appear on layout declarations. */
|
||
if (qual->flags.q.prim_type) {
|
||
_mesa_glsl_error(loc, state,
|
||
"Primitive type may only be specified on GS input or output "
|
||
"layout declaration, not on variables.");
|
||
}
|
||
|
||
/* Section 6.1.1 (Function Calling Conventions) of the GLSL 1.10 spec says:
|
||
*
|
||
* "However, the const qualifier cannot be used with out or inout."
|
||
*
|
||
* The same section of the GLSL 4.40 spec further clarifies this saying:
|
||
*
|
||
* "The const qualifier cannot be used with out or inout, or a
|
||
* compile-time error results."
|
||
*/
|
||
if (is_parameter && qual->flags.q.constant && qual->flags.q.out) {
|
||
_mesa_glsl_error(loc, state,
|
||
"`const' may not be applied to `out' or `inout' "
|
||
"function parameters");
|
||
}
|
||
|
||
/* If there is no qualifier that changes the mode of the variable, leave
|
||
* the setting alone.
|
||
*/
|
||
assert(var->data.mode != ir_var_temporary);
|
||
if (qual->flags.q.in && qual->flags.q.out)
|
||
{
|
||
if (!is_parameter && (state->stage == MESA_SHADER_FRAGMENT))
|
||
var->data.mode = ir_var_shader_inout;
|
||
else
|
||
var->data.mode = ir_var_function_inout;
|
||
}
|
||
else if (qual->flags.q.in)
|
||
var->data.mode = is_parameter ? ir_var_function_in : ir_var_shader_in;
|
||
else if (qual->flags.q.attribute
|
||
|| (qual->flags.q.varying && (state->stage == MESA_SHADER_FRAGMENT)))
|
||
var->data.mode = ir_var_shader_in;
|
||
else if (qual->flags.q.out)
|
||
var->data.mode = is_parameter ? ir_var_function_out : ir_var_shader_out;
|
||
else if (qual->flags.q.varying && (state->stage == MESA_SHADER_VERTEX))
|
||
var->data.mode = ir_var_shader_out;
|
||
else if (qual->flags.q.uniform)
|
||
var->data.mode = ir_var_uniform;
|
||
|
||
if (!is_parameter && is_varying_var(var, state->stage)) {
|
||
/* User-defined ins/outs are not permitted in compute shaders. */
|
||
if (state->stage == MESA_SHADER_COMPUTE) {
|
||
_mesa_glsl_error(loc, state,
|
||
"user-defined input and output variables are not "
|
||
"permitted in compute shaders");
|
||
}
|
||
|
||
/* This variable is being used to link data between shader stages (in
|
||
* pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
|
||
* that is allowed for such purposes.
|
||
*
|
||
* From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
|
||
*
|
||
* "The varying qualifier can be used only with the data types
|
||
* float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
|
||
* these."
|
||
*
|
||
* This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
|
||
* page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
|
||
*
|
||
* "Fragment inputs can only be signed and unsigned integers and
|
||
* integer vectors, float, floating-point vectors, matrices, or
|
||
* arrays of these. Structures cannot be input.
|
||
*
|
||
* Similar text exists in the section on vertex shader outputs.
|
||
*
|
||
* Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
|
||
* 3.00 spec allows structs as well. Varying structs are also allowed
|
||
* in GLSL 1.50.
|
||
*/
|
||
switch (var->type->get_scalar_type()->base_type) {
|
||
case GLSL_TYPE_FLOAT:
|
||
/* Ok in all GLSL versions */
|
||
break;
|
||
case GLSL_TYPE_UINT:
|
||
case GLSL_TYPE_INT:
|
||
if (state->is_version(130, 300))
|
||
break;
|
||
_mesa_glsl_error(loc, state,
|
||
"varying variables must be of base type float in %s",
|
||
state->get_version_string());
|
||
break;
|
||
case GLSL_TYPE_STRUCT:
|
||
if (state->is_version(150, 300))
|
||
break;
|
||
_mesa_glsl_error(loc, state,
|
||
"varying variables may not be of type struct");
|
||
break;
|
||
default:
|
||
_mesa_glsl_error(loc, state, "illegal type for a varying variable");
|
||
break;
|
||
}
|
||
}
|
||
|
||
if (state->all_invariant && (state->current_function == NULL)) {
|
||
switch (state->stage) {
|
||
case MESA_SHADER_VERTEX:
|
||
if (var->data.mode == ir_var_shader_out)
|
||
var->data.invariant = true;
|
||
break;
|
||
case MESA_SHADER_GEOMETRY:
|
||
if ((var->data.mode == ir_var_shader_in)
|
||
|| (var->data.mode == ir_var_shader_out))
|
||
var->data.invariant = true;
|
||
break;
|
||
case MESA_SHADER_FRAGMENT:
|
||
if (var->data.mode == ir_var_shader_in)
|
||
var->data.invariant = true;
|
||
break;
|
||
case MESA_SHADER_COMPUTE:
|
||
/* Invariance isn't meaningful in compute shaders. */
|
||
break;
|
||
}
|
||
}
|
||
|
||
var->data.interpolation =
|
||
interpret_interpolation_qualifier(qual, (ir_variable_mode) var->data.mode,
|
||
state, loc);
|
||
|
||
var->data.pixel_center_integer = qual->flags.q.pixel_center_integer;
|
||
var->data.origin_upper_left = qual->flags.q.origin_upper_left;
|
||
if ((qual->flags.q.origin_upper_left || qual->flags.q.pixel_center_integer)
|
||
&& (strcmp(var->name, "gl_FragCoord") != 0)) {
|
||
const char *const qual_string = (qual->flags.q.origin_upper_left)
|
||
? "origin_upper_left" : "pixel_center_integer";
|
||
|
||
_mesa_glsl_error(loc, state,
|
||
"layout qualifier `%s' can only be applied to "
|
||
"fragment shader input `gl_FragCoord'",
|
||
qual_string);
|
||
}
|
||
|
||
if (var->name != NULL && strcmp(var->name, "gl_FragCoord") == 0) {
|
||
|
||
/* Section 4.3.8.1, page 39 of GLSL 1.50 spec says:
|
||
*
|
||
* "Within any shader, the first redeclarations of gl_FragCoord
|
||
* must appear before any use of gl_FragCoord."
|
||
*
|
||
* Generate a compiler error if above condition is not met by the
|
||
* fragment shader.
|
||
*/
|
||
ir_variable *earlier = state->symbols->get_variable("gl_FragCoord");
|
||
if (earlier != NULL &&
|
||
earlier->data.used &&
|
||
!state->fs_redeclares_gl_fragcoord) {
|
||
_mesa_glsl_error(loc, state,
|
||
"gl_FragCoord used before its first redeclaration "
|
||
"in fragment shader");
|
||
}
|
||
|
||
/* Make sure all gl_FragCoord redeclarations specify the same layout
|
||
* qualifiers.
|
||
*/
|
||
if (is_conflicting_fragcoord_redeclaration(state, qual)) {
|
||
const char *const qual_string =
|
||
get_layout_qualifier_string(qual->flags.q.origin_upper_left,
|
||
qual->flags.q.pixel_center_integer);
|
||
|
||
const char *const state_string =
|
||
get_layout_qualifier_string(state->fs_origin_upper_left,
|
||
state->fs_pixel_center_integer);
|
||
|
||
_mesa_glsl_error(loc, state,
|
||
"gl_FragCoord redeclared with different layout "
|
||
"qualifiers (%s) and (%s) ",
|
||
state_string,
|
||
qual_string);
|
||
}
|
||
state->fs_origin_upper_left = qual->flags.q.origin_upper_left;
|
||
state->fs_pixel_center_integer = qual->flags.q.pixel_center_integer;
|
||
state->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers =
|
||
!qual->flags.q.origin_upper_left && !qual->flags.q.pixel_center_integer;
|
||
state->fs_redeclares_gl_fragcoord =
|
||
state->fs_origin_upper_left ||
|
||
state->fs_pixel_center_integer ||
|
||
state->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers;
|
||
}
|
||
|
||
if (qual->flags.q.explicit_location) {
|
||
validate_explicit_location(qual, var, state, loc);
|
||
} else if (qual->flags.q.explicit_index) {
|
||
_mesa_glsl_error(loc, state, "explicit index requires explicit location");
|
||
}
|
||
|
||
if (qual->flags.q.explicit_binding &&
|
||
validate_binding_qualifier(state, loc, var, qual)) {
|
||
var->data.explicit_binding = true;
|
||
var->data.binding = qual->binding;
|
||
}
|
||
|
||
if (var->type->contains_atomic()) {
|
||
if (var->data.mode == ir_var_uniform) {
|
||
if (var->data.explicit_binding) {
|
||
unsigned *offset =
|
||
&state->atomic_counter_offsets[var->data.binding];
|
||
|
||
if (*offset % ATOMIC_COUNTER_SIZE)
|
||
_mesa_glsl_error(loc, state,
|
||
"misaligned atomic counter offset");
|
||
|
||
var->data.atomic.offset = *offset;
|
||
*offset += var->type->atomic_size();
|
||
|
||
} else {
|
||
_mesa_glsl_error(loc, state,
|
||
"atomic counters require explicit binding point");
|
||
}
|
||
} else if (var->data.mode != ir_var_function_in) {
|
||
_mesa_glsl_error(loc, state, "atomic counters may only be declared as "
|
||
"function parameters or uniform-qualified "
|
||
"global variables");
|
||
}
|
||
}
|
||
|
||
/* Does the declaration use the deprecated 'attribute' or 'varying'
|
||
* keywords?
|
||
*/
|
||
const bool uses_deprecated_qualifier = qual->flags.q.attribute
|
||
|| qual->flags.q.varying;
|
||
|
||
|
||
/* Validate auxiliary storage qualifiers */
|
||
|
||
/* From section 4.3.4 of the GLSL 1.30 spec:
|
||
* "It is an error to use centroid in in a vertex shader."
|
||
*
|
||
* From section 4.3.4 of the GLSL ES 3.00 spec:
|
||
* "It is an error to use centroid in or interpolation qualifiers in
|
||
* a vertex shader input."
|
||
*/
|
||
|
||
/* Section 4.3.6 of the GLSL 1.30 specification states:
|
||
* "It is an error to use centroid out in a fragment shader."
|
||
*
|
||
* The GL_ARB_shading_language_420pack extension specification states:
|
||
* "It is an error to use auxiliary storage qualifiers or interpolation
|
||
* qualifiers on an output in a fragment shader."
|
||
*/
|
||
if (qual->flags.q.sample && (!is_varying_var(var, state->stage) || uses_deprecated_qualifier)) {
|
||
_mesa_glsl_error(loc, state,
|
||
"sample qualifier may only be used on `in` or `out` "
|
||
"variables between shader stages");
|
||
}
|
||
if (qual->flags.q.centroid && !is_varying_var(var, state->stage)) {
|
||
_mesa_glsl_error(loc, state,
|
||
"centroid qualifier may only be used with `in', "
|
||
"`out' or `varying' variables between shader stages");
|
||
}
|
||
|
||
|
||
/* Is the 'layout' keyword used with parameters that allow relaxed checking.
|
||
* Many implementations of GL_ARB_fragment_coord_conventions_enable and some
|
||
* implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
|
||
* allowed the layout qualifier to be used with 'varying' and 'attribute'.
|
||
* These extensions and all following extensions that add the 'layout'
|
||
* keyword have been modified to require the use of 'in' or 'out'.
|
||
*
|
||
* The following extension do not allow the deprecated keywords:
|
||
*
|
||
* GL_AMD_conservative_depth
|
||
* GL_ARB_conservative_depth
|
||
* GL_ARB_gpu_shader5
|
||
* GL_ARB_separate_shader_objects
|
||
* GL_ARB_tesselation_shader
|
||
* GL_ARB_transform_feedback3
|
||
* GL_ARB_uniform_buffer_object
|
||
*
|
||
* It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
|
||
* allow layout with the deprecated keywords.
|
||
*/
|
||
const bool relaxed_layout_qualifier_checking =
|
||
state->ARB_fragment_coord_conventions_enable;
|
||
|
||
if (qual->has_layout() && uses_deprecated_qualifier) {
|
||
if (relaxed_layout_qualifier_checking) {
|
||
_mesa_glsl_warning(loc, state,
|
||
"`layout' qualifier may not be used with "
|
||
"`attribute' or `varying'");
|
||
} else {
|
||
_mesa_glsl_error(loc, state,
|
||
"`layout' qualifier may not be used with "
|
||
"`attribute' or `varying'");
|
||
}
|
||
}
|
||
|
||
/* Layout qualifiers for gl_FragDepth, which are enabled by extension
|
||
* AMD_conservative_depth.
|
||
*/
|
||
int depth_layout_count = qual->flags.q.depth_any
|
||
+ qual->flags.q.depth_greater
|
||
+ qual->flags.q.depth_less
|
||
+ qual->flags.q.depth_unchanged;
|
||
if (depth_layout_count > 0
|
||
&& !state->AMD_conservative_depth_enable
|
||
&& !state->ARB_conservative_depth_enable) {
|
||
_mesa_glsl_error(loc, state,
|
||
"extension GL_AMD_conservative_depth or "
|
||
"GL_ARB_conservative_depth must be enabled "
|
||
"to use depth layout qualifiers");
|
||
} else if (depth_layout_count > 0
|
||
&& strcmp(var->name, "gl_FragDepth") != 0) {
|
||
_mesa_glsl_error(loc, state,
|
||
"depth layout qualifiers can be applied only to "
|
||
"gl_FragDepth");
|
||
} else if (depth_layout_count > 1
|
||
&& strcmp(var->name, "gl_FragDepth") == 0) {
|
||
_mesa_glsl_error(loc, state,
|
||
"at most one depth layout qualifier can be applied to "
|
||
"gl_FragDepth");
|
||
}
|
||
if (qual->flags.q.depth_any)
|
||
var->data.depth_layout = ir_depth_layout_any;
|
||
else if (qual->flags.q.depth_greater)
|
||
var->data.depth_layout = ir_depth_layout_greater;
|
||
else if (qual->flags.q.depth_less)
|
||
var->data.depth_layout = ir_depth_layout_less;
|
||
else if (qual->flags.q.depth_unchanged)
|
||
var->data.depth_layout = ir_depth_layout_unchanged;
|
||
else
|
||
var->data.depth_layout = ir_depth_layout_none;
|
||
|
||
if (qual->flags.q.std140 ||
|
||
qual->flags.q.packed ||
|
||
qual->flags.q.shared) {
|
||
_mesa_glsl_error(loc, state,
|
||
"uniform block layout qualifiers std140, packed, and "
|
||
"shared can only be applied to uniform blocks, not "
|
||
"members");
|
||
}
|
||
|
||
if (qual->flags.q.row_major || qual->flags.q.column_major) {
|
||
validate_matrix_layout_for_type(state, loc, var->type, var);
|
||
}
|
||
|
||
if (var->type->contains_image())
|
||
apply_image_qualifier_to_variable(qual, var, state, loc);
|
||
}
|
||
|
||
/**
|
||
* Get the variable that is being redeclared by this declaration
|
||
*
|
||
* Semantic checks to verify the validity of the redeclaration are also
|
||
* performed. If semantic checks fail, compilation error will be emitted via
|
||
* \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
|
||
*
|
||
* \returns
|
||
* A pointer to an existing variable in the current scope if the declaration
|
||
* is a redeclaration, \c NULL otherwise.
|
||
*/
|
||
static ir_variable *
|
||
get_variable_being_redeclared(ir_variable *var, YYLTYPE loc,
|
||
struct _mesa_glsl_parse_state *state,
|
||
bool allow_all_redeclarations)
|
||
{
|
||
/* Check if this declaration is actually a re-declaration, either to
|
||
* resize an array or add qualifiers to an existing variable.
|
||
*
|
||
* This is allowed for variables in the current scope, or when at
|
||
* global scope (for built-ins in the implicit outer scope).
|
||
*/
|
||
ir_variable *earlier = state->symbols->get_variable(var->name);
|
||
if (earlier == NULL ||
|
||
(state->current_function != NULL &&
|
||
!state->symbols->name_declared_this_scope(var->name))) {
|
||
return NULL;
|
||
}
|
||
|
||
|
||
/* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
|
||
*
|
||
* "It is legal to declare an array without a size and then
|
||
* later re-declare the same name as an array of the same
|
||
* type and specify a size."
|
||
*/
|
||
if (earlier->type->is_unsized_array() && var->type->is_array()
|
||
&& (var->type->element_type() == earlier->type->element_type())) {
|
||
/* FINISHME: This doesn't match the qualifiers on the two
|
||
* FINISHME: declarations. It's not 100% clear whether this is
|
||
* FINISHME: required or not.
|
||
*/
|
||
|
||
const unsigned size = unsigned(var->type->array_size());
|
||
check_builtin_array_max_size(var->name, size, loc, state);
|
||
if ((size > 0) && (size <= earlier->data.max_array_access)) {
|
||
_mesa_glsl_error(& loc, state, "array size must be > %u due to "
|
||
"previous access",
|
||
earlier->data.max_array_access);
|
||
}
|
||
|
||
earlier->type = var->type;
|
||
delete var;
|
||
var = NULL;
|
||
} else if ((state->ARB_fragment_coord_conventions_enable ||
|
||
state->is_version(150, 0))
|
||
&& strcmp(var->name, "gl_FragCoord") == 0
|
||
&& earlier->type == var->type
|
||
&& earlier->data.mode == var->data.mode) {
|
||
/* Allow redeclaration of gl_FragCoord for ARB_fcc layout
|
||
* qualifiers.
|
||
*/
|
||
earlier->data.origin_upper_left = var->data.origin_upper_left;
|
||
earlier->data.pixel_center_integer = var->data.pixel_center_integer;
|
||
|
||
/* According to section 4.3.7 of the GLSL 1.30 spec,
|
||
* the following built-in varaibles can be redeclared with an
|
||
* interpolation qualifier:
|
||
* * gl_FrontColor
|
||
* * gl_BackColor
|
||
* * gl_FrontSecondaryColor
|
||
* * gl_BackSecondaryColor
|
||
* * gl_Color
|
||
* * gl_SecondaryColor
|
||
*/
|
||
} else if (state->is_version(130, 0)
|
||
&& (strcmp(var->name, "gl_FrontColor") == 0
|
||
|| strcmp(var->name, "gl_BackColor") == 0
|
||
|| strcmp(var->name, "gl_FrontSecondaryColor") == 0
|
||
|| strcmp(var->name, "gl_BackSecondaryColor") == 0
|
||
|| strcmp(var->name, "gl_Color") == 0
|
||
|| strcmp(var->name, "gl_SecondaryColor") == 0)
|
||
&& earlier->type == var->type
|
||
&& earlier->data.mode == var->data.mode) {
|
||
earlier->data.interpolation = var->data.interpolation;
|
||
|
||
/* Layout qualifiers for gl_FragDepth. */
|
||
} else if ((state->AMD_conservative_depth_enable ||
|
||
state->ARB_conservative_depth_enable)
|
||
&& strcmp(var->name, "gl_FragDepth") == 0
|
||
&& earlier->type == var->type
|
||
&& earlier->data.mode == var->data.mode) {
|
||
|
||
/** From the AMD_conservative_depth spec:
|
||
* Within any shader, the first redeclarations of gl_FragDepth
|
||
* must appear before any use of gl_FragDepth.
|
||
*/
|
||
if (earlier->data.used) {
|
||
_mesa_glsl_error(&loc, state,
|
||
"the first redeclaration of gl_FragDepth "
|
||
"must appear before any use of gl_FragDepth");
|
||
}
|
||
|
||
/* Prevent inconsistent redeclaration of depth layout qualifier. */
|
||
if (earlier->data.depth_layout != ir_depth_layout_none
|
||
&& earlier->data.depth_layout != var->data.depth_layout) {
|
||
_mesa_glsl_error(&loc, state,
|
||
"gl_FragDepth: depth layout is declared here "
|
||
"as '%s, but it was previously declared as "
|
||
"'%s'",
|
||
depth_layout_string(var->data.depth_layout),
|
||
depth_layout_string(earlier->data.depth_layout));
|
||
}
|
||
|
||
earlier->data.depth_layout = var->data.depth_layout;
|
||
|
||
} else if (allow_all_redeclarations) {
|
||
if (earlier->data.mode != var->data.mode) {
|
||
_mesa_glsl_error(&loc, state,
|
||
"redeclaration of `%s' with incorrect qualifiers",
|
||
var->name);
|
||
} else if (earlier->type != var->type) {
|
||
_mesa_glsl_error(&loc, state,
|
||
"redeclaration of `%s' has incorrect type",
|
||
var->name);
|
||
}
|
||
} else {
|
||
_mesa_glsl_error(&loc, state, "`%s' redeclared", var->name);
|
||
}
|
||
|
||
return earlier;
|
||
}
|
||
|
||
/**
|
||
* Generate the IR for an initializer in a variable declaration
|
||
*/
|
||
ir_rvalue *
|
||
process_initializer(ir_variable *var, ast_declaration *decl,
|
||
ast_fully_specified_type *type,
|
||
exec_list *initializer_instructions,
|
||
struct _mesa_glsl_parse_state *state)
|
||
{
|
||
ir_rvalue *result = NULL;
|
||
|
||
YYLTYPE initializer_loc = decl->initializer->get_location();
|
||
|
||
/* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
|
||
*
|
||
* "All uniform variables are read-only and are initialized either
|
||
* directly by an application via API commands, or indirectly by
|
||
* OpenGL."
|
||
*/
|
||
if (var->data.mode == ir_var_uniform) {
|
||
state->check_version(120, 0, &initializer_loc,
|
||
"cannot initialize uniforms");
|
||
}
|
||
|
||
/* From section 4.1.7 of the GLSL 4.40 spec:
|
||
*
|
||
* "Opaque variables [...] are initialized only through the
|
||
* OpenGL API; they cannot be declared with an initializer in a
|
||
* shader."
|
||
*/
|
||
if (var->type->contains_opaque()) {
|
||
_mesa_glsl_error(& initializer_loc, state,
|
||
"cannot initialize opaque variable");
|
||
}
|
||
|
||
if ((var->data.mode == ir_var_shader_in) && (state->current_function == NULL)) {
|
||
_mesa_glsl_error(& initializer_loc, state,
|
||
"cannot initialize %s shader input / %s",
|
||
_mesa_shader_stage_to_string(state->stage),
|
||
(state->stage == MESA_SHADER_VERTEX)
|
||
? "attribute" : "varying");
|
||
}
|
||
|
||
/* If the initializer is an ast_aggregate_initializer, recursively store
|
||
* type information from the LHS into it, so that its hir() function can do
|
||
* type checking.
|
||
*/
|
||
if (decl->initializer->oper == ast_aggregate)
|
||
_mesa_ast_set_aggregate_type(var->type, decl->initializer);
|
||
|
||
ir_dereference *const lhs = new(state) ir_dereference_variable(var);
|
||
ir_rvalue *rhs = decl->initializer->hir(initializer_instructions, state);
|
||
|
||
/* Propagate precision qualifier for constant value */
|
||
if (type->qualifier.flags.q.constant) {
|
||
ir_constant *constant_value = rhs->constant_expression_value();
|
||
if (NULL != constant_value) {
|
||
constant_value->set_precision((glsl_precision)type->qualifier.precision);
|
||
if (constant_value->type->is_array()) {
|
||
for (unsigned i = 0; i < constant_value->type->length; i++) {
|
||
constant_value->get_array_element(i)->set_precision((glsl_precision)type->qualifier.precision);
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Calculate the constant value if this is a const or uniform
|
||
* declaration.
|
||
*/
|
||
if (type->qualifier.flags.q.constant
|
||
|| type->qualifier.flags.q.uniform) {
|
||
ir_rvalue *new_rhs = validate_assignment(state, initializer_loc,
|
||
var->type, rhs, true);
|
||
if (new_rhs != NULL) {
|
||
rhs = new_rhs;
|
||
|
||
ir_constant *constant_value = rhs->constant_expression_value();
|
||
if (!constant_value) {
|
||
/* If ARB_shading_language_420pack is enabled, initializers of
|
||
* const-qualified local variables do not have to be constant
|
||
* expressions. Const-qualified global variables must still be
|
||
* initialized with constant expressions.
|
||
*/
|
||
if (!state->ARB_shading_language_420pack_enable
|
||
|| state->current_function == NULL) {
|
||
_mesa_glsl_error(& initializer_loc, state,
|
||
"initializer of %s variable `%s' must be a "
|
||
"constant expression",
|
||
(type->qualifier.flags.q.constant)
|
||
? "const" : "uniform",
|
||
decl->identifier);
|
||
if (var->type->is_numeric()) {
|
||
/* Reduce cascading errors. */
|
||
var->constant_value = ir_constant::zero(state, var->type);
|
||
}
|
||
}
|
||
} else {
|
||
rhs = constant_value;
|
||
var->constant_value = constant_value;
|
||
}
|
||
} else {
|
||
if (var->type->is_numeric()) {
|
||
/* Reduce cascading errors. */
|
||
var->constant_value = ir_constant::zero(state, var->type);
|
||
}
|
||
}
|
||
}
|
||
|
||
if (rhs && !rhs->type->is_error()) {
|
||
bool temp = var->data.read_only;
|
||
if (type->qualifier.flags.q.constant)
|
||
var->data.read_only = false;
|
||
|
||
/* Never emit code to initialize a uniform.
|
||
*/
|
||
const glsl_type *initializer_type;
|
||
if (!type->qualifier.flags.q.uniform) {
|
||
do_assignment(initializer_instructions, state,
|
||
NULL,
|
||
lhs, rhs,
|
||
&result, true,
|
||
true,
|
||
type->get_location());
|
||
initializer_type = result->type;
|
||
} else
|
||
initializer_type = rhs->type;
|
||
|
||
var->constant_initializer = rhs->constant_expression_value();
|
||
var->data.has_initializer = true;
|
||
|
||
/* If the declared variable is an unsized array, it must inherrit
|
||
* its full type from the initializer. A declaration such as
|
||
*
|
||
* uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
|
||
*
|
||
* becomes
|
||
*
|
||
* uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
|
||
*
|
||
* The assignment generated in the if-statement (below) will also
|
||
* automatically handle this case for non-uniforms.
|
||
*
|
||
* If the declared variable is not an array, the types must
|
||
* already match exactly. As a result, the type assignment
|
||
* here can be done unconditionally. For non-uniforms the call
|
||
* to do_assignment can change the type of the initializer (via
|
||
* the implicit conversion rules). For uniforms the initializer
|
||
* must be a constant expression, and the type of that expression
|
||
* was validated above.
|
||
*/
|
||
var->type = initializer_type;
|
||
|
||
var->data.read_only = temp;
|
||
}
|
||
|
||
return result;
|
||
}
|
||
|
||
static void
|
||
apply_precision_to_variable(const struct ast_type_qualifier& qual,
|
||
ir_variable *var, bool function_param,
|
||
struct _mesa_glsl_parse_state *state)
|
||
{
|
||
if (!state->es_shader)
|
||
return;
|
||
if (var->type->is_sampler() && qual.precision == ast_precision_none && !function_param)
|
||
var->data.precision = ast_precision_low; // samplers default to low precision (outside of function arguments)
|
||
else
|
||
var->data.precision = qual.precision;
|
||
}
|
||
|
||
|
||
/**
|
||
* Do additional processing necessary for geometry shader input declarations
|
||
* (this covers both interface blocks arrays and bare input variables).
|
||
*/
|
||
static void
|
||
handle_geometry_shader_input_decl(struct _mesa_glsl_parse_state *state,
|
||
YYLTYPE loc, ir_variable *var)
|
||
{
|
||
unsigned num_vertices = 0;
|
||
if (state->gs_input_prim_type_specified) {
|
||
num_vertices = vertices_per_prim(state->in_qualifier->prim_type);
|
||
}
|
||
|
||
/* Geometry shader input variables must be arrays. Caller should have
|
||
* reported an error for this.
|
||
*/
|
||
if (!var->type->is_array()) {
|
||
assert(state->error);
|
||
|
||
/* To avoid cascading failures, short circuit the checks below. */
|
||
return;
|
||
}
|
||
|
||
if (var->type->is_unsized_array()) {
|
||
/* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec says:
|
||
*
|
||
* All geometry shader input unsized array declarations will be
|
||
* sized by an earlier input layout qualifier, when present, as per
|
||
* the following table.
|
||
*
|
||
* Followed by a table mapping each allowed input layout qualifier to
|
||
* the corresponding input length.
|
||
*/
|
||
if (num_vertices != 0)
|
||
var->type = glsl_type::get_array_instance(var->type->fields.array,
|
||
num_vertices);
|
||
} else {
|
||
/* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec
|
||
* includes the following examples of compile-time errors:
|
||
*
|
||
* // code sequence within one shader...
|
||
* in vec4 Color1[]; // size unknown
|
||
* ...Color1.length()...// illegal, length() unknown
|
||
* in vec4 Color2[2]; // size is 2
|
||
* ...Color1.length()...// illegal, Color1 still has no size
|
||
* in vec4 Color3[3]; // illegal, input sizes are inconsistent
|
||
* layout(lines) in; // legal, input size is 2, matching
|
||
* in vec4 Color4[3]; // illegal, contradicts layout
|
||
* ...
|
||
*
|
||
* To detect the case illustrated by Color3, we verify that the size of
|
||
* an explicitly-sized array matches the size of any previously declared
|
||
* explicitly-sized array. To detect the case illustrated by Color4, we
|
||
* verify that the size of an explicitly-sized array is consistent with
|
||
* any previously declared input layout.
|
||
*/
|
||
if (num_vertices != 0 && var->type->length != num_vertices) {
|
||
_mesa_glsl_error(&loc, state,
|
||
"geometry shader input size contradicts previously"
|
||
" declared layout (size is %u, but layout requires a"
|
||
" size of %u)", var->type->length, num_vertices);
|
||
} else if (state->gs_input_size != 0 &&
|
||
var->type->length != state->gs_input_size) {
|
||
_mesa_glsl_error(&loc, state,
|
||
"geometry shader input sizes are "
|
||
"inconsistent (size is %u, but a previous "
|
||
"declaration has size %u)",
|
||
var->type->length, state->gs_input_size);
|
||
} else {
|
||
state->gs_input_size = var->type->length;
|
||
}
|
||
}
|
||
}
|
||
|
||
|
||
void
|
||
validate_identifier(const char *identifier, YYLTYPE loc,
|
||
struct _mesa_glsl_parse_state *state)
|
||
{
|
||
/* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
|
||
*
|
||
* "Identifiers starting with "gl_" are reserved for use by
|
||
* OpenGL, and may not be declared in a shader as either a
|
||
* variable or a function."
|
||
*/
|
||
if (is_gl_identifier(identifier)) {
|
||
_mesa_glsl_error(&loc, state,
|
||
"identifier `%s' uses reserved `gl_' prefix",
|
||
identifier);
|
||
} else if (strstr(identifier, "__")) {
|
||
/* From page 14 (page 20 of the PDF) of the GLSL 1.10
|
||
* spec:
|
||
*
|
||
* "In addition, all identifiers containing two
|
||
* consecutive underscores (__) are reserved as
|
||
* possible future keywords."
|
||
*
|
||
* The intention is that names containing __ are reserved for internal
|
||
* use by the implementation, and names prefixed with GL_ are reserved
|
||
* for use by Khronos. Names simply containing __ are dangerous to use,
|
||
* but should be allowed.
|
||
*
|
||
* A future version of the GLSL specification will clarify this.
|
||
*/
|
||
_mesa_glsl_warning(&loc, state,
|
||
"identifier `%s' uses reserved `__' string",
|
||
identifier);
|
||
}
|
||
}
|
||
|
||
static bool
|
||
precision_qualifier_allowed(const glsl_type *type)
|
||
{
|
||
/* Precision qualifiers apply to floating point, integer and sampler
|
||
* types.
|
||
*
|
||
* Section 4.5.2 (Precision Qualifiers) of the GLSL 1.30 spec says:
|
||
* "Any floating point or any integer declaration can have the type
|
||
* preceded by one of these precision qualifiers [...] Literal
|
||
* constants do not have precision qualifiers. Neither do Boolean
|
||
* variables.
|
||
*
|
||
* Section 4.5 (Precision and Precision Qualifiers) of the GLSL 1.30
|
||
* spec also says:
|
||
*
|
||
* "Precision qualifiers are added for code portability with OpenGL
|
||
* ES, not for functionality. They have the same syntax as in OpenGL
|
||
* ES."
|
||
*
|
||
* Section 8 (Built-In Functions) of the GLSL ES 1.00 spec says:
|
||
*
|
||
* "uniform lowp sampler2D sampler;
|
||
* highp vec2 coord;
|
||
* ...
|
||
* lowp vec4 col = texture2D (sampler, coord);
|
||
* // texture2D returns lowp"
|
||
*
|
||
* From this, we infer that GLSL 1.30 (and later) should allow precision
|
||
* qualifiers on sampler types just like float and integer types.
|
||
*/
|
||
return type->is_float()
|
||
|| type->is_integer()
|
||
|| type->is_record()
|
||
|| type->is_sampler();
|
||
}
|
||
|
||
ir_rvalue *
|
||
ast_declarator_list::hir(exec_list *instructions,
|
||
struct _mesa_glsl_parse_state *state)
|
||
{
|
||
void *ctx = state;
|
||
const struct glsl_type *decl_type;
|
||
const char *type_name = NULL;
|
||
ir_rvalue *result = NULL;
|
||
YYLTYPE loc = this->get_location();
|
||
|
||
/* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
|
||
*
|
||
* "To ensure that a particular output variable is invariant, it is
|
||
* necessary to use the invariant qualifier. It can either be used to
|
||
* qualify a previously declared variable as being invariant
|
||
*
|
||
* invariant gl_Position; // make existing gl_Position be invariant"
|
||
*
|
||
* In these cases the parser will set the 'invariant' flag in the declarator
|
||
* list, and the type will be NULL.
|
||
*/
|
||
if (this->invariant) {
|
||
assert(this->type == NULL);
|
||
|
||
if (state->current_function != NULL) {
|
||
_mesa_glsl_error(& loc, state,
|
||
"all uses of `invariant' keyword must be at global "
|
||
"scope");
|
||
}
|
||
|
||
foreach_list_typed (ast_declaration, decl, link, &this->declarations) {
|
||
assert(decl->array_specifier == NULL);
|
||
assert(decl->initializer == NULL);
|
||
|
||
ir_variable *const earlier =
|
||
state->symbols->get_variable(decl->identifier);
|
||
if (earlier == NULL) {
|
||
_mesa_glsl_error(& loc, state,
|
||
"undeclared variable `%s' cannot be marked "
|
||
"invariant", decl->identifier);
|
||
} else if (!is_varying_var(earlier, state->stage)) {
|
||
_mesa_glsl_error(&loc, state,
|
||
"`%s' cannot be marked invariant; interfaces between "
|
||
"shader stages only.", decl->identifier);
|
||
} else if (earlier->data.used) {
|
||
_mesa_glsl_error(& loc, state,
|
||
"variable `%s' may not be redeclared "
|
||
"`invariant' after being used",
|
||
earlier->name);
|
||
} else {
|
||
earlier->data.invariant = true;
|
||
}
|
||
}
|
||
|
||
/* Invariant redeclarations do not have r-values.
|
||
*/
|
||
return NULL;
|
||
}
|
||
|
||
if (this->precise) {
|
||
assert(this->type == NULL);
|
||
|
||
foreach_list_typed (ast_declaration, decl, link, &this->declarations) {
|
||
assert(decl->array_specifier == NULL);
|
||
assert(decl->initializer == NULL);
|
||
|
||
ir_variable *const earlier =
|
||
state->symbols->get_variable(decl->identifier);
|
||
if (earlier == NULL) {
|
||
_mesa_glsl_error(& loc, state,
|
||
"undeclared variable `%s' cannot be marked "
|
||
"precise", decl->identifier);
|
||
} else if (state->current_function != NULL &&
|
||
!state->symbols->name_declared_this_scope(decl->identifier)) {
|
||
/* Note: we have to check if we're in a function, since
|
||
* builtins are treated as having come from another scope.
|
||
*/
|
||
_mesa_glsl_error(& loc, state,
|
||
"variable `%s' from an outer scope may not be "
|
||
"redeclared `precise' in this scope",
|
||
earlier->name);
|
||
} else if (earlier->data.used) {
|
||
_mesa_glsl_error(& loc, state,
|
||
"variable `%s' may not be redeclared "
|
||
"`precise' after being used",
|
||
earlier->name);
|
||
} else {
|
||
earlier->data.precise = true;
|
||
}
|
||
}
|
||
|
||
/* Precise redeclarations do not have r-values either. */
|
||
return NULL;
|
||
}
|
||
|
||
assert(this->type != NULL);
|
||
assert(!this->invariant);
|
||
assert(!this->precise);
|
||
|
||
/* The type specifier may contain a structure definition. Process that
|
||
* before any of the variable declarations.
|
||
*/
|
||
(void) this->type->specifier->hir(instructions, state);
|
||
|
||
decl_type = this->type->glsl_type(& type_name, state);
|
||
|
||
/* An offset-qualified atomic counter declaration sets the default
|
||
* offset for the next declaration within the same atomic counter
|
||
* buffer.
|
||
*/
|
||
if (decl_type && decl_type->contains_atomic()) {
|
||
if (type->qualifier.flags.q.explicit_binding &&
|
||
type->qualifier.flags.q.explicit_offset)
|
||
state->atomic_counter_offsets[type->qualifier.binding] =
|
||
type->qualifier.offset;
|
||
}
|
||
|
||
if (this->declarations.is_empty()) {
|
||
/* If there is no structure involved in the program text, there are two
|
||
* possible scenarios:
|
||
*
|
||
* - The program text contained something like 'vec4;'. This is an
|
||
* empty declaration. It is valid but weird. Emit a warning.
|
||
*
|
||
* - The program text contained something like 'S;' and 'S' is not the
|
||
* name of a known structure type. This is both invalid and weird.
|
||
* Emit an error.
|
||
*
|
||
* - The program text contained something like 'mediump float;'
|
||
* when the programmer probably meant 'precision mediump
|
||
* float;' Emit a warning with a description of what they
|
||
* probably meant to do.
|
||
*
|
||
* Note that if decl_type is NULL and there is a structure involved,
|
||
* there must have been some sort of error with the structure. In this
|
||
* case we assume that an error was already generated on this line of
|
||
* code for the structure. There is no need to generate an additional,
|
||
* confusing error.
|
||
*/
|
||
assert(this->type->specifier->structure == NULL || decl_type != NULL
|
||
|| state->error);
|
||
|
||
if (decl_type == NULL) {
|
||
_mesa_glsl_error(&loc, state,
|
||
"invalid type `%s' in empty declaration",
|
||
type_name);
|
||
} else if (decl_type->base_type == GLSL_TYPE_ATOMIC_UINT) {
|
||
/* Empty atomic counter declarations are allowed and useful
|
||
* to set the default offset qualifier.
|
||
*/
|
||
return NULL;
|
||
} else if (this->type->qualifier.precision != ast_precision_none) {
|
||
if (this->type->specifier->structure != NULL) {
|
||
_mesa_glsl_error(&loc, state,
|
||
"precision qualifiers can't be applied "
|
||
"to structures");
|
||
} else {
|
||
static const char *const precision_names[] = {
|
||
"highp",
|
||
"highp",
|
||
"mediump",
|
||
"lowp"
|
||
};
|
||
|
||
_mesa_glsl_warning(&loc, state,
|
||
"empty declaration with precision qualifier, "
|
||
"to set the default precision, use "
|
||
"`precision %s %s;'",
|
||
precision_names[this->type->qualifier.precision],
|
||
type_name);
|
||
}
|
||
} else if (this->type->specifier->structure == NULL) {
|
||
_mesa_glsl_warning(&loc, state, "empty declaration");
|
||
}
|
||
}
|
||
|
||
foreach_list_typed (ast_declaration, decl, link, &this->declarations) {
|
||
const struct glsl_type *var_type;
|
||
ir_variable *var;
|
||
|
||
/* FINISHME: Emit a warning if a variable declaration shadows a
|
||
* FINISHME: declaration at a higher scope.
|
||
*/
|
||
|
||
if ((decl_type == NULL) || decl_type->is_void()) {
|
||
if (type_name != NULL) {
|
||
_mesa_glsl_error(& loc, state,
|
||
"invalid type `%s' in declaration of `%s'",
|
||
type_name, decl->identifier);
|
||
} else {
|
||
_mesa_glsl_error(& loc, state,
|
||
"invalid type in declaration of `%s'",
|
||
decl->identifier);
|
||
}
|
||
continue;
|
||
}
|
||
|
||
var_type = process_array_type(&loc, decl_type, decl->array_specifier,
|
||
state);
|
||
|
||
var = new(ctx) ir_variable(var_type, decl->identifier, ir_var_auto, (glsl_precision)this->type->qualifier.precision);
|
||
|
||
/* The 'varying in' and 'varying out' qualifiers can only be used with
|
||
* ARB_geometry_shader4 and EXT_geometry_shader4, which we don't support
|
||
* yet.
|
||
*/
|
||
if (this->type->qualifier.flags.q.varying) {
|
||
if (this->type->qualifier.flags.q.in) {
|
||
_mesa_glsl_error(& loc, state,
|
||
"`varying in' qualifier in declaration of "
|
||
"`%s' only valid for geometry shaders using "
|
||
"ARB_geometry_shader4 or EXT_geometry_shader4",
|
||
decl->identifier);
|
||
} else if (this->type->qualifier.flags.q.out) {
|
||
_mesa_glsl_error(& loc, state,
|
||
"`varying out' qualifier in declaration of "
|
||
"`%s' only valid for geometry shaders using "
|
||
"ARB_geometry_shader4 or EXT_geometry_shader4",
|
||
decl->identifier);
|
||
}
|
||
}
|
||
|
||
/* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
|
||
*
|
||
* "Global variables can only use the qualifiers const,
|
||
* attribute, uniform, or varying. Only one may be
|
||
* specified.
|
||
*
|
||
* Local variables can only use the qualifier const."
|
||
*
|
||
* This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
|
||
* any extension that adds the 'layout' keyword.
|
||
*/
|
||
if (!state->is_version(130, 300)
|
||
&& !state->has_explicit_attrib_location()
|
||
&& !state->has_separate_shader_objects()
|
||
&& !state->ARB_fragment_coord_conventions_enable) {
|
||
if (this->type->qualifier.flags.q.out) {
|
||
_mesa_glsl_error(& loc, state,
|
||
"`out' qualifier in declaration of `%s' "
|
||
"only valid for function parameters in %s",
|
||
decl->identifier, state->get_version_string());
|
||
}
|
||
if (this->type->qualifier.flags.q.in) {
|
||
_mesa_glsl_error(& loc, state,
|
||
"`in' qualifier in declaration of `%s' "
|
||
"only valid for function parameters in %s",
|
||
decl->identifier, state->get_version_string());
|
||
}
|
||
/* FINISHME: Test for other invalid qualifiers. */
|
||
}
|
||
|
||
apply_type_qualifier_to_variable(& this->type->qualifier, var, state,
|
||
& loc, false);
|
||
apply_precision_to_variable(this->type->qualifier, var, false, state);
|
||
|
||
if (this->type->qualifier.flags.q.invariant) {
|
||
if (!is_varying_var(var, state->stage)) {
|
||
_mesa_glsl_error(&loc, state,
|
||
"`%s' cannot be marked invariant; interfaces between "
|
||
"shader stages only", var->name);
|
||
}
|
||
}
|
||
|
||
if (state->current_function != NULL) {
|
||
const char *mode = NULL;
|
||
const char *extra = "";
|
||
|
||
/* There is no need to check for 'inout' here because the parser will
|
||
* only allow that in function parameter lists.
|
||
*/
|
||
if (this->type->qualifier.flags.q.attribute) {
|
||
mode = "attribute";
|
||
} else if (this->type->qualifier.flags.q.uniform) {
|
||
mode = "uniform";
|
||
} else if (this->type->qualifier.flags.q.varying) {
|
||
mode = "varying";
|
||
} else if (this->type->qualifier.flags.q.in) {
|
||
mode = "in";
|
||
extra = " or in function parameter list";
|
||
} else if (this->type->qualifier.flags.q.out) {
|
||
mode = "out";
|
||
extra = " or in function parameter list";
|
||
}
|
||
|
||
if (mode) {
|
||
_mesa_glsl_error(& loc, state,
|
||
"%s variable `%s' must be declared at "
|
||
"global scope%s",
|
||
mode, var->name, extra);
|
||
}
|
||
} else if (var->data.mode == ir_var_shader_in) {
|
||
var->data.read_only = true;
|
||
|
||
if (state->stage == MESA_SHADER_VERTEX) {
|
||
bool error_emitted = false;
|
||
|
||
/* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
|
||
*
|
||
* "Vertex shader inputs can only be float, floating-point
|
||
* vectors, matrices, signed and unsigned integers and integer
|
||
* vectors. Vertex shader inputs can also form arrays of these
|
||
* types, but not structures."
|
||
*
|
||
* From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
|
||
*
|
||
* "Vertex shader inputs can only be float, floating-point
|
||
* vectors, matrices, signed and unsigned integers and integer
|
||
* vectors. They cannot be arrays or structures."
|
||
*
|
||
* From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
|
||
*
|
||
* "The attribute qualifier can be used only with float,
|
||
* floating-point vectors, and matrices. Attribute variables
|
||
* cannot be declared as arrays or structures."
|
||
*
|
||
* From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
|
||
*
|
||
* "Vertex shader inputs can only be float, floating-point
|
||
* vectors, matrices, signed and unsigned integers and integer
|
||
* vectors. Vertex shader inputs cannot be arrays or
|
||
* structures."
|
||
*/
|
||
const glsl_type *check_type = var->type;
|
||
while (check_type->is_array())
|
||
check_type = check_type->element_type();
|
||
|
||
switch (check_type->base_type) {
|
||
case GLSL_TYPE_FLOAT:
|
||
break;
|
||
case GLSL_TYPE_UINT:
|
||
case GLSL_TYPE_INT:
|
||
if (state->is_version(120, 300))
|
||
break;
|
||
/* FALLTHROUGH */
|
||
default:
|
||
_mesa_glsl_error(& loc, state,
|
||
"vertex shader input / attribute cannot have "
|
||
"type %s`%s'",
|
||
var->type->is_array() ? "array of " : "",
|
||
check_type->name);
|
||
error_emitted = true;
|
||
}
|
||
|
||
if (!error_emitted && var->type->is_array() &&
|
||
!state->check_version(150, 0, &loc,
|
||
"vertex shader input / attribute "
|
||
"cannot have array type")) {
|
||
error_emitted = true;
|
||
}
|
||
} else if (state->stage == MESA_SHADER_GEOMETRY) {
|
||
/* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
|
||
*
|
||
* Geometry shader input variables get the per-vertex values
|
||
* written out by vertex shader output variables of the same
|
||
* names. Since a geometry shader operates on a set of
|
||
* vertices, each input varying variable (or input block, see
|
||
* interface blocks below) needs to be declared as an array.
|
||
*/
|
||
if (!var->type->is_array()) {
|
||
_mesa_glsl_error(&loc, state,
|
||
"geometry shader inputs must be arrays");
|
||
}
|
||
|
||
handle_geometry_shader_input_decl(state, loc, var);
|
||
}
|
||
}
|
||
|
||
/* Integer fragment inputs must be qualified with 'flat'. In GLSL ES,
|
||
* so must integer vertex outputs.
|
||
*
|
||
* From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
|
||
* "Fragment shader inputs that are signed or unsigned integers or
|
||
* integer vectors must be qualified with the interpolation qualifier
|
||
* flat."
|
||
*
|
||
* From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
|
||
* "Fragment shader inputs that are, or contain, signed or unsigned
|
||
* integers or integer vectors must be qualified with the
|
||
* interpolation qualifier flat."
|
||
*
|
||
* From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
|
||
* "Vertex shader outputs that are, or contain, signed or unsigned
|
||
* integers or integer vectors must be qualified with the
|
||
* interpolation qualifier flat."
|
||
*
|
||
* Note that prior to GLSL 1.50, this requirement applied to vertex
|
||
* outputs rather than fragment inputs. That creates problems in the
|
||
* presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
|
||
* desktop GL shaders. For GLSL ES shaders, we follow the spec and
|
||
* apply the restriction to both vertex outputs and fragment inputs.
|
||
*
|
||
* Note also that the desktop GLSL specs are missing the text "or
|
||
* contain"; this is presumably an oversight, since there is no
|
||
* reasonable way to interpolate a fragment shader input that contains
|
||
* an integer.
|
||
*/
|
||
if (state->is_version(130, 300) &&
|
||
var->type->contains_integer() &&
|
||
var->data.interpolation != INTERP_QUALIFIER_FLAT &&
|
||
((state->stage == MESA_SHADER_FRAGMENT && var->data.mode == ir_var_shader_in)
|
||
|| (state->stage == MESA_SHADER_VERTEX && var->data.mode == ir_var_shader_out
|
||
&& state->es_shader))) {
|
||
const char *var_type = (state->stage == MESA_SHADER_VERTEX) ?
|
||
"vertex output" : "fragment input";
|
||
_mesa_glsl_error(&loc, state, "if a %s is (or contains) "
|
||
"an integer, then it must be qualified with 'flat'",
|
||
var_type);
|
||
}
|
||
|
||
|
||
/* Interpolation qualifiers cannot be applied to 'centroid' and
|
||
* 'centroid varying'.
|
||
*
|
||
* From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
|
||
* "interpolation qualifiers may only precede the qualifiers in,
|
||
* centroid in, out, or centroid out in a declaration. They do not apply
|
||
* to the deprecated storage qualifiers varying or centroid varying."
|
||
*
|
||
* These deprecated storage qualifiers do not exist in GLSL ES 3.00.
|
||
*/
|
||
if (state->is_version(130, 0)
|
||
&& this->type->qualifier.has_interpolation()
|
||
&& this->type->qualifier.flags.q.varying) {
|
||
|
||
const char *i = this->type->qualifier.interpolation_string();
|
||
assert(i != NULL);
|
||
const char *s;
|
||
if (this->type->qualifier.flags.q.centroid)
|
||
s = "centroid varying";
|
||
else
|
||
s = "varying";
|
||
|
||
_mesa_glsl_error(&loc, state,
|
||
"qualifier '%s' cannot be applied to the "
|
||
"deprecated storage qualifier '%s'", i, s);
|
||
}
|
||
|
||
|
||
/* Interpolation qualifiers can only apply to vertex shader outputs and
|
||
* fragment shader inputs.
|
||
*
|
||
* From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
|
||
* "Outputs from a vertex shader (out) and inputs to a fragment
|
||
* shader (in) can be further qualified with one or more of these
|
||
* interpolation qualifiers"
|
||
*
|
||
* From page 31 (page 37 of the PDF) of the GLSL ES 3.00 spec:
|
||
* "These interpolation qualifiers may only precede the qualifiers
|
||
* in, centroid in, out, or centroid out in a declaration. They do
|
||
* not apply to inputs into a vertex shader or outputs from a
|
||
* fragment shader."
|
||
*/
|
||
if (state->is_version(130, 300)
|
||
&& this->type->qualifier.has_interpolation()) {
|
||
|
||
const char *i = this->type->qualifier.interpolation_string();
|
||
assert(i != NULL);
|
||
|
||
switch (state->stage) {
|
||
case MESA_SHADER_VERTEX:
|
||
if (this->type->qualifier.flags.q.in) {
|
||
_mesa_glsl_error(&loc, state,
|
||
"qualifier '%s' cannot be applied to vertex "
|
||
"shader inputs", i);
|
||
}
|
||
break;
|
||
case MESA_SHADER_FRAGMENT:
|
||
if (this->type->qualifier.flags.q.out) {
|
||
_mesa_glsl_error(&loc, state,
|
||
"qualifier '%s' cannot be applied to fragment "
|
||
"shader outputs", i);
|
||
}
|
||
break;
|
||
default:
|
||
break;
|
||
}
|
||
}
|
||
|
||
|
||
/* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
|
||
*/
|
||
if (this->type->qualifier.precision != ast_precision_none) {
|
||
state->check_precision_qualifiers_allowed(&loc);
|
||
}
|
||
|
||
|
||
/* If a precision qualifier is allowed on a type, it is allowed on
|
||
* an array of that type.
|
||
*/
|
||
if (!(this->type->qualifier.precision == ast_precision_none
|
||
|| precision_qualifier_allowed(var->type)
|
||
|| (var->type->is_array()
|
||
&& precision_qualifier_allowed(var->type->fields.array)))) {
|
||
|
||
_mesa_glsl_error(&loc, state,
|
||
"precision qualifiers apply only to floating point"
|
||
", integer and sampler types");
|
||
}
|
||
|
||
/* From section 4.1.7 of the GLSL 4.40 spec:
|
||
*
|
||
* "[Opaque types] can only be declared as function
|
||
* parameters or uniform-qualified variables."
|
||
*/
|
||
if (var_type->contains_opaque() &&
|
||
!this->type->qualifier.flags.q.uniform) {
|
||
_mesa_glsl_error(&loc, state,
|
||
"opaque variables must be declared uniform");
|
||
}
|
||
|
||
/* Process the initializer and add its instructions to a temporary
|
||
* list. This list will be added to the instruction stream (below) after
|
||
* the declaration is added. This is done because in some cases (such as
|
||
* redeclarations) the declaration may not actually be added to the
|
||
* instruction stream.
|
||
*/
|
||
exec_list initializer_instructions;
|
||
|
||
/* Examine var name here since var may get deleted in the next call */
|
||
bool var_is_gl_id = is_gl_identifier(var->name);
|
||
|
||
ir_variable *earlier =
|
||
get_variable_being_redeclared(var, decl->get_location(), state,
|
||
false /* allow_all_redeclarations */);
|
||
if (earlier != NULL) {
|
||
if (var_is_gl_id &&
|
||
earlier->data.how_declared == ir_var_declared_in_block) {
|
||
_mesa_glsl_error(&loc, state,
|
||
"`%s' has already been redeclared using "
|
||
"gl_PerVertex", var->name);
|
||
}
|
||
earlier->data.how_declared = ir_var_declared_normally;
|
||
}
|
||
|
||
if (decl->initializer != NULL) {
|
||
result = process_initializer((earlier == NULL) ? var : earlier,
|
||
decl, this->type,
|
||
&initializer_instructions, state);
|
||
}
|
||
|
||
/* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
|
||
*
|
||
* "It is an error to write to a const variable outside of
|
||
* its declaration, so they must be initialized when
|
||
* declared."
|
||
*/
|
||
if (this->type->qualifier.flags.q.constant && decl->initializer == NULL) {
|
||
_mesa_glsl_error(& loc, state,
|
||
"const declaration of `%s' must be initialized",
|
||
decl->identifier);
|
||
}
|
||
|
||
if (state->es_shader) {
|
||
const glsl_type *const t = (earlier == NULL)
|
||
? var->type : earlier->type;
|
||
|
||
if (t->is_unsized_array())
|
||
/* Section 10.17 of the GLSL ES 1.00 specification states that
|
||
* unsized array declarations have been removed from the language.
|
||
* Arrays that are sized using an initializer are still explicitly
|
||
* sized. However, GLSL ES 1.00 does not allow array
|
||
* initializers. That is only allowed in GLSL ES 3.00.
|
||
*
|
||
* Section 4.1.9 (Arrays) of the GLSL ES 3.00 spec says:
|
||
*
|
||
* "An array type can also be formed without specifying a size
|
||
* if the definition includes an initializer:
|
||
*
|
||
* float x[] = float[2] (1.0, 2.0); // declares an array of size 2
|
||
* float y[] = float[] (1.0, 2.0, 3.0); // declares an array of size 3
|
||
*
|
||
* float a[5];
|
||
* float b[] = a;"
|
||
*/
|
||
_mesa_glsl_error(& loc, state,
|
||
"unsized array declarations are not allowed in "
|
||
"GLSL ES");
|
||
}
|
||
|
||
/* If the declaration is not a redeclaration, there are a few additional
|
||
* semantic checks that must be applied. In addition, variable that was
|
||
* created for the declaration should be added to the IR stream.
|
||
*/
|
||
if (earlier == NULL) {
|
||
validate_identifier(decl->identifier, loc, state);
|
||
|
||
/* Add the variable to the symbol table. Note that the initializer's
|
||
* IR was already processed earlier (though it hasn't been emitted
|
||
* yet), without the variable in scope.
|
||
*
|
||
* This differs from most C-like languages, but it follows the GLSL
|
||
* specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
|
||
* spec:
|
||
*
|
||
* "Within a declaration, the scope of a name starts immediately
|
||
* after the initializer if present or immediately after the name
|
||
* being declared if not."
|
||
*/
|
||
if (!state->symbols->add_variable(var)) {
|
||
YYLTYPE loc = this->get_location();
|
||
_mesa_glsl_error(&loc, state, "name `%s' already taken in the "
|
||
"current scope", decl->identifier);
|
||
continue;
|
||
}
|
||
|
||
/* Push the variable declaration to the top. It means that all the
|
||
* variable declarations will appear in a funny last-to-first order,
|
||
* but otherwise we run into trouble if a function is prototyped, a
|
||
* global var is decled, then the function is defined with usage of
|
||
* the global var. See glslparsertest's CorrectModule.frag.
|
||
* However, do not insert declarations before default precision statements
|
||
* or type declarations.
|
||
*/
|
||
ir_instruction* before_node = (ir_instruction*)instructions->head;
|
||
while (before_node && (before_node->ir_type == ir_type_precision || before_node->ir_type == ir_type_typedecl))
|
||
before_node = (ir_instruction*)before_node->next;
|
||
if (before_node)
|
||
before_node->insert_before(var);
|
||
else
|
||
instructions->push_head(var);
|
||
}
|
||
|
||
instructions->append_list(&initializer_instructions);
|
||
}
|
||
|
||
|
||
/* Generally, variable declarations do not have r-values. However,
|
||
* one is used for the declaration in
|
||
*
|
||
* while (bool b = some_condition()) {
|
||
* ...
|
||
* }
|
||
*
|
||
* so we return the rvalue from the last seen declaration here.
|
||
*/
|
||
return result;
|
||
}
|
||
|
||
|
||
ir_rvalue *
|
||
ast_parameter_declarator::hir(exec_list *instructions,
|
||
struct _mesa_glsl_parse_state *state)
|
||
{
|
||
void *ctx = state;
|
||
const struct glsl_type *type;
|
||
const char *name = NULL;
|
||
YYLTYPE loc = this->get_location();
|
||
|
||
type = this->type->glsl_type(& name, state);
|
||
|
||
if (type == NULL) {
|
||
if (name != NULL) {
|
||
_mesa_glsl_error(& loc, state,
|
||
"invalid type `%s' in declaration of `%s'",
|
||
name, this->identifier);
|
||
} else {
|
||
_mesa_glsl_error(& loc, state,
|
||
"invalid type in declaration of `%s'",
|
||
this->identifier);
|
||
}
|
||
|
||
type = glsl_type::error_type;
|
||
}
|
||
|
||
/* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
|
||
*
|
||
* "Functions that accept no input arguments need not use void in the
|
||
* argument list because prototypes (or definitions) are required and
|
||
* therefore there is no ambiguity when an empty argument list "( )" is
|
||
* declared. The idiom "(void)" as a parameter list is provided for
|
||
* convenience."
|
||
*
|
||
* Placing this check here prevents a void parameter being set up
|
||
* for a function, which avoids tripping up checks for main taking
|
||
* parameters and lookups of an unnamed symbol.
|
||
*/
|
||
if (type->is_void()) {
|
||
if (this->identifier != NULL)
|
||
_mesa_glsl_error(& loc, state,
|
||
"named parameter cannot have type `void'");
|
||
|
||
is_void = true;
|
||
return NULL;
|
||
}
|
||
|
||
if (formal_parameter && (this->identifier == NULL)) {
|
||
_mesa_glsl_error(& loc, state, "formal parameter lacks a name");
|
||
return NULL;
|
||
}
|
||
|
||
/* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
|
||
* call already handled the "vec4[..] foo" case.
|
||
*/
|
||
type = process_array_type(&loc, type, this->array_specifier, state);
|
||
|
||
if (!type->is_error() && type->is_unsized_array()) {
|
||
_mesa_glsl_error(&loc, state, "arrays passed as parameters must have "
|
||
"a declared size");
|
||
type = glsl_type::error_type;
|
||
}
|
||
|
||
is_void = false;
|
||
ir_variable *var = new(ctx)
|
||
ir_variable(type, this->identifier, ir_var_function_in, (glsl_precision)this->type->qualifier.precision);
|
||
|
||
/* Apply any specified qualifiers to the parameter declaration. Note that
|
||
* for function parameters the default mode is 'in'.
|
||
*/
|
||
apply_type_qualifier_to_variable(& this->type->qualifier, var, state, & loc,
|
||
true);
|
||
apply_precision_to_variable(this->type->qualifier, var, true, state);
|
||
|
||
/* From section 4.1.7 of the GLSL 4.40 spec:
|
||
*
|
||
* "Opaque variables cannot be treated as l-values; hence cannot
|
||
* be used as out or inout function parameters, nor can they be
|
||
* assigned into."
|
||
*/
|
||
if ((var->data.mode == ir_var_function_inout || var->data.mode == ir_var_function_out)
|
||
&& type->contains_opaque()) {
|
||
_mesa_glsl_error(&loc, state, "out and inout parameters cannot "
|
||
"contain opaque variables");
|
||
type = glsl_type::error_type;
|
||
}
|
||
|
||
/* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
|
||
*
|
||
* "When calling a function, expressions that do not evaluate to
|
||
* l-values cannot be passed to parameters declared as out or inout."
|
||
*
|
||
* From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
|
||
*
|
||
* "Other binary or unary expressions, non-dereferenced arrays,
|
||
* function names, swizzles with repeated fields, and constants
|
||
* cannot be l-values."
|
||
*
|
||
* So for GLSL 1.10, passing an array as an out or inout parameter is not
|
||
* allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
|
||
*/
|
||
if ((var->data.mode == ir_var_function_inout || var->data.mode == ir_var_function_out)
|
||
&& type->is_array()
|
||
&& !state->check_version(120, 100, &loc,
|
||
"arrays cannot be out or inout parameters")) {
|
||
type = glsl_type::error_type;
|
||
}
|
||
|
||
instructions->push_tail(var);
|
||
|
||
/* Parameter declarations do not have r-values.
|
||
*/
|
||
return NULL;
|
||
}
|
||
|
||
|
||
void
|
||
ast_parameter_declarator::parameters_to_hir(exec_list *ast_parameters,
|
||
bool formal,
|
||
exec_list *ir_parameters,
|
||
_mesa_glsl_parse_state *state)
|
||
{
|
||
ast_parameter_declarator *void_param = NULL;
|
||
unsigned count = 0;
|
||
|
||
foreach_list_typed (ast_parameter_declarator, param, link, ast_parameters) {
|
||
param->formal_parameter = formal;
|
||
param->hir(ir_parameters, state);
|
||
|
||
if (param->is_void)
|
||
void_param = param;
|
||
|
||
count++;
|
||
}
|
||
|
||
if ((void_param != NULL) && (count > 1)) {
|
||
YYLTYPE loc = void_param->get_location();
|
||
|
||
_mesa_glsl_error(& loc, state,
|
||
"`void' parameter must be only parameter");
|
||
}
|
||
}
|
||
|
||
|
||
void
|
||
emit_function(_mesa_glsl_parse_state *state, ir_function *f)
|
||
{
|
||
/* IR invariants disallow function declarations or definitions
|
||
* nested within other function definitions. But there is no
|
||
* requirement about the relative order of function declarations
|
||
* and definitions with respect to one another. So simply insert
|
||
* the new ir_function block at the end of the toplevel instruction
|
||
* list.
|
||
*/
|
||
state->toplevel_ir->push_tail(f);
|
||
}
|
||
|
||
|
||
ir_rvalue *
|
||
ast_function::hir(exec_list *instructions,
|
||
struct _mesa_glsl_parse_state *state)
|
||
{
|
||
void *ctx = state;
|
||
ir_function *f = NULL;
|
||
ir_function_signature *sig = NULL;
|
||
exec_list hir_parameters;
|
||
|
||
const char *const name = identifier;
|
||
|
||
/* New functions are always added to the top-level IR instruction stream,
|
||
* so this instruction list pointer is ignored. See also emit_function
|
||
* (called below).
|
||
*/
|
||
(void) instructions;
|
||
|
||
/* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
|
||
*
|
||
* "Function declarations (prototypes) cannot occur inside of functions;
|
||
* they must be at global scope, or for the built-in functions, outside
|
||
* the global scope."
|
||
*
|
||
* From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
|
||
*
|
||
* "User defined functions may only be defined within the global scope."
|
||
*
|
||
* Note that this language does not appear in GLSL 1.10.
|
||
*/
|
||
if ((state->current_function != NULL) &&
|
||
state->is_version(120, 100)) {
|
||
YYLTYPE loc = this->get_location();
|
||
_mesa_glsl_error(&loc, state,
|
||
"declaration of function `%s' not allowed within "
|
||
"function body", name);
|
||
}
|
||
|
||
validate_identifier(name, this->get_location(), state);
|
||
|
||
/* Convert the list of function parameters to HIR now so that they can be
|
||
* used below to compare this function's signature with previously seen
|
||
* signatures for functions with the same name.
|
||
*/
|
||
ast_parameter_declarator::parameters_to_hir(& this->parameters,
|
||
is_definition,
|
||
& hir_parameters, state);
|
||
|
||
const char *return_type_name;
|
||
const glsl_type *return_type =
|
||
this->return_type->glsl_type(& return_type_name, state);
|
||
|
||
if (!return_type) {
|
||
YYLTYPE loc = this->get_location();
|
||
_mesa_glsl_error(&loc, state,
|
||
"function `%s' has undeclared return type `%s'",
|
||
name, return_type_name);
|
||
return_type = glsl_type::error_type;
|
||
}
|
||
|
||
/* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
|
||
* "No qualifier is allowed on the return type of a function."
|
||
*/
|
||
if (this->return_type->has_qualifiers()) {
|
||
YYLTYPE loc = this->get_location();
|
||
_mesa_glsl_error(& loc, state,
|
||
"function `%s' return type has qualifiers", name);
|
||
}
|
||
|
||
/* Section 6.1 (Function Definitions) of the GLSL 1.20 spec says:
|
||
*
|
||
* "Arrays are allowed as arguments and as the return type. In both
|
||
* cases, the array must be explicitly sized."
|
||
*/
|
||
if (return_type->is_unsized_array()) {
|
||
YYLTYPE loc = this->get_location();
|
||
_mesa_glsl_error(& loc, state,
|
||
"function `%s' return type array must be explicitly "
|
||
"sized", name);
|
||
}
|
||
|
||
/* From section 4.1.7 of the GLSL 4.40 spec:
|
||
*
|
||
* "[Opaque types] can only be declared as function parameters
|
||
* or uniform-qualified variables."
|
||
*/
|
||
if (return_type->contains_opaque()) {
|
||
YYLTYPE loc = this->get_location();
|
||
_mesa_glsl_error(&loc, state,
|
||
"function `%s' return type can't contain an opaque type",
|
||
name);
|
||
}
|
||
|
||
/* Create an ir_function if one doesn't already exist. */
|
||
f = state->symbols->get_function(name);
|
||
if (f == NULL) {
|
||
f = new(ctx) ir_function(name);
|
||
if (!state->symbols->add_function(f)) {
|
||
/* This function name shadows a non-function use of the same name. */
|
||
YYLTYPE loc = this->get_location();
|
||
|
||
_mesa_glsl_error(&loc, state, "function name `%s' conflicts with "
|
||
"non-function", name);
|
||
return NULL;
|
||
}
|
||
|
||
emit_function(state, f);
|
||
}
|
||
|
||
/* Verify that this function's signature either doesn't match a previously
|
||
* seen signature for a function with the same name, or, if a match is found,
|
||
* that the previously seen signature does not have an associated definition.
|
||
*/
|
||
if (state->es_shader || f->has_user_signature()) {
|
||
sig = f->exact_matching_signature(state, &hir_parameters);
|
||
if (sig != NULL) {
|
||
const char *badvar = sig->qualifiers_match(&hir_parameters);
|
||
if (badvar != NULL) {
|
||
YYLTYPE loc = this->get_location();
|
||
|
||
_mesa_glsl_error(&loc, state, "function `%s' parameter `%s' "
|
||
"qualifiers don't match prototype", name, badvar);
|
||
}
|
||
|
||
if (sig->return_type != return_type) {
|
||
YYLTYPE loc = this->get_location();
|
||
|
||
_mesa_glsl_error(&loc, state, "function `%s' return type doesn't "
|
||
"match prototype", name);
|
||
}
|
||
|
||
if (sig->is_defined) {
|
||
if (is_definition) {
|
||
YYLTYPE loc = this->get_location();
|
||
_mesa_glsl_error(& loc, state, "function `%s' redefined", name);
|
||
} else {
|
||
/* We just encountered a prototype that exactly matches a
|
||
* function that's already been defined. This is redundant,
|
||
* and we should ignore it.
|
||
*/
|
||
return NULL;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Verify the return type of main() */
|
||
if (strcmp(name, "main") == 0) {
|
||
if (! return_type->is_void()) {
|
||
YYLTYPE loc = this->get_location();
|
||
|
||
_mesa_glsl_error(& loc, state, "main() must return void");
|
||
}
|
||
|
||
if (!hir_parameters.is_empty()) {
|
||
YYLTYPE loc = this->get_location();
|
||
|
||
_mesa_glsl_error(& loc, state, "main() must not take any parameters");
|
||
}
|
||
}
|
||
|
||
/* Finish storing the information about this new function in its signature.
|
||
*/
|
||
if (sig == NULL) {
|
||
sig = new(ctx) ir_function_signature(return_type, (glsl_precision)this->return_type->qualifier.precision);
|
||
f->add_signature(sig);
|
||
}
|
||
|
||
sig->replace_parameters(&hir_parameters);
|
||
signature = sig;
|
||
|
||
/* Function declarations (prototypes) do not have r-values.
|
||
*/
|
||
return NULL;
|
||
}
|
||
|
||
|
||
ir_rvalue *
|
||
ast_function_definition::hir(exec_list *instructions,
|
||
struct _mesa_glsl_parse_state *state)
|
||
{
|
||
prototype->is_definition = true;
|
||
prototype->hir(instructions, state);
|
||
|
||
ir_function_signature *signature = prototype->signature;
|
||
if (signature == NULL)
|
||
return NULL;
|
||
|
||
assert(state->current_function == NULL);
|
||
state->current_function = signature;
|
||
state->found_return = false;
|
||
|
||
/* Duplicate parameters declared in the prototype as concrete variables.
|
||
* Add these to the symbol table.
|
||
*/
|
||
state->symbols->push_scope();
|
||
foreach_in_list(ir_variable, var, &signature->parameters) {
|
||
assert(var->as_variable() != NULL);
|
||
|
||
/* The only way a parameter would "exist" is if two parameters have
|
||
* the same name.
|
||
*/
|
||
if (state->symbols->name_declared_this_scope(var->name)) {
|
||
YYLTYPE loc = this->get_location();
|
||
|
||
_mesa_glsl_error(& loc, state, "parameter `%s' redeclared", var->name);
|
||
} else {
|
||
state->symbols->add_variable(var);
|
||
}
|
||
}
|
||
|
||
/* Convert the body of the function to HIR. */
|
||
this->body->hir(&signature->body, state);
|
||
signature->is_defined = true;
|
||
|
||
state->symbols->pop_scope();
|
||
|
||
assert(state->current_function == signature);
|
||
state->current_function = NULL;
|
||
|
||
if (!signature->return_type->is_void() && !state->found_return) {
|
||
YYLTYPE loc = this->get_location();
|
||
_mesa_glsl_error(& loc, state, "function `%s' has non-void return type "
|
||
"%s, but no return statement",
|
||
signature->function_name(),
|
||
signature->return_type->name);
|
||
}
|
||
|
||
/* Function definitions do not have r-values.
|
||
*/
|
||
return NULL;
|
||
}
|
||
|
||
|
||
ir_rvalue *
|
||
ast_jump_statement::hir(exec_list *instructions,
|
||
struct _mesa_glsl_parse_state *state)
|
||
{
|
||
void *ctx = state;
|
||
|
||
switch (mode) {
|
||
case ast_return: {
|
||
ir_return *inst;
|
||
assert(state->current_function);
|
||
|
||
if (opt_return_value) {
|
||
ir_rvalue *ret = opt_return_value->hir(instructions, state);
|
||
|
||
/* The value of the return type can be NULL if the shader says
|
||
* 'return foo();' and foo() is a function that returns void.
|
||
*
|
||
* NOTE: The GLSL spec doesn't say that this is an error. The type
|
||
* of the return value is void. If the return type of the function is
|
||
* also void, then this should compile without error. Seriously.
|
||
*/
|
||
const glsl_type *const ret_type =
|
||
(ret == NULL) ? glsl_type::void_type : ret->type;
|
||
|
||
/* Implicit conversions are not allowed for return values prior to
|
||
* ARB_shading_language_420pack.
|
||
*/
|
||
if (state->current_function->return_type != ret_type) {
|
||
YYLTYPE loc = this->get_location();
|
||
|
||
if (state->ARB_shading_language_420pack_enable) {
|
||
if (!apply_implicit_conversion(state->current_function->return_type,
|
||
ret, state)) {
|
||
_mesa_glsl_error(& loc, state,
|
||
"could not implicitly convert return value "
|
||
"to %s, in function `%s'",
|
||
state->current_function->return_type->name,
|
||
state->current_function->function_name());
|
||
}
|
||
} else {
|
||
_mesa_glsl_error(& loc, state,
|
||
"`return' with wrong type %s, in function `%s' "
|
||
"returning %s",
|
||
ret_type->name,
|
||
state->current_function->function_name(),
|
||
state->current_function->return_type->name);
|
||
}
|
||
} else if (state->current_function->return_type->base_type ==
|
||
GLSL_TYPE_VOID) {
|
||
YYLTYPE loc = this->get_location();
|
||
|
||
/* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20
|
||
* specs add a clarification:
|
||
*
|
||
* "A void function can only use return without a return argument, even if
|
||
* the return argument has void type. Return statements only accept values:
|
||
*
|
||
* void func1() { }
|
||
* void func2() { return func1(); } // illegal return statement"
|
||
*/
|
||
_mesa_glsl_error(& loc, state,
|
||
"void functions can only use `return' without a "
|
||
"return argument");
|
||
}
|
||
|
||
inst = new(ctx) ir_return(ret);
|
||
} else {
|
||
if (state->current_function->return_type->base_type !=
|
||
GLSL_TYPE_VOID) {
|
||
YYLTYPE loc = this->get_location();
|
||
|
||
_mesa_glsl_error(& loc, state,
|
||
"`return' with no value, in function %s returning "
|
||
"non-void",
|
||
state->current_function->function_name());
|
||
}
|
||
inst = new(ctx) ir_return;
|
||
}
|
||
|
||
state->found_return = true;
|
||
instructions->push_tail(inst);
|
||
break;
|
||
}
|
||
|
||
case ast_discard:
|
||
if (state->stage != MESA_SHADER_FRAGMENT) {
|
||
YYLTYPE loc = this->get_location();
|
||
|
||
_mesa_glsl_error(& loc, state,
|
||
"`discard' may only appear in a fragment shader");
|
||
}
|
||
instructions->push_tail(new(ctx) ir_discard);
|
||
break;
|
||
|
||
case ast_break:
|
||
case ast_continue:
|
||
if (mode == ast_continue &&
|
||
state->loop_nesting_ast == NULL) {
|
||
YYLTYPE loc = this->get_location();
|
||
|
||
_mesa_glsl_error(& loc, state, "continue may only appear in a loop");
|
||
} else if (mode == ast_break &&
|
||
state->loop_nesting_ast == NULL &&
|
||
state->switch_state.switch_nesting_ast == NULL) {
|
||
YYLTYPE loc = this->get_location();
|
||
|
||
_mesa_glsl_error(& loc, state,
|
||
"break may only appear in a loop or a switch");
|
||
} else {
|
||
/* For a loop, inline the for loop expression again, since we don't
|
||
* know where near the end of the loop body the normal copy of it is
|
||
* going to be placed. Same goes for the condition for a do-while
|
||
* loop.
|
||
*/
|
||
if (state->loop_nesting_ast != NULL &&
|
||
mode == ast_continue) {
|
||
if (state->loop_nesting_ast->rest_expression) {
|
||
state->loop_nesting_ast->rest_expression->hir(instructions,
|
||
state);
|
||
}
|
||
if (state->loop_nesting_ast->mode ==
|
||
ast_iteration_statement::ast_do_while) {
|
||
state->loop_nesting_ast->condition_to_hir(instructions, state);
|
||
}
|
||
}
|
||
|
||
if (state->switch_state.is_switch_innermost &&
|
||
mode == ast_break) {
|
||
/* Force break out of switch by setting is_break switch state.
|
||
*/
|
||
ir_variable *const is_break_var = state->switch_state.is_break_var;
|
||
ir_dereference_variable *const deref_is_break_var =
|
||
new(ctx) ir_dereference_variable(is_break_var);
|
||
ir_constant *const true_val = new(ctx) ir_constant(true);
|
||
ir_assignment *const set_break_var =
|
||
new(ctx) ir_assignment(deref_is_break_var, true_val);
|
||
|
||
instructions->push_tail(set_break_var);
|
||
}
|
||
else {
|
||
ir_loop_jump *const jump =
|
||
new(ctx) ir_loop_jump((mode == ast_break)
|
||
? ir_loop_jump::jump_break
|
||
: ir_loop_jump::jump_continue);
|
||
instructions->push_tail(jump);
|
||
}
|
||
}
|
||
|
||
break;
|
||
}
|
||
|
||
/* Jump instructions do not have r-values.
|
||
*/
|
||
return NULL;
|
||
}
|
||
|
||
|
||
ir_rvalue *
|
||
ast_selection_statement::hir(exec_list *instructions,
|
||
struct _mesa_glsl_parse_state *state)
|
||
{
|
||
void *ctx = state;
|
||
|
||
ir_rvalue *const condition = this->condition->hir(instructions, state);
|
||
|
||
/* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
|
||
*
|
||
* "Any expression whose type evaluates to a Boolean can be used as the
|
||
* conditional expression bool-expression. Vector types are not accepted
|
||
* as the expression to if."
|
||
*
|
||
* The checks are separated so that higher quality diagnostics can be
|
||
* generated for cases where both rules are violated.
|
||
*/
|
||
if (!condition->type->is_boolean() || !condition->type->is_scalar()) {
|
||
YYLTYPE loc = this->condition->get_location();
|
||
|
||
_mesa_glsl_error(& loc, state, "if-statement condition must be scalar "
|
||
"boolean");
|
||
}
|
||
|
||
ir_if *const stmt = new(ctx) ir_if(condition);
|
||
|
||
if (then_statement != NULL) {
|
||
state->symbols->push_scope();
|
||
then_statement->hir(& stmt->then_instructions, state);
|
||
state->symbols->pop_scope();
|
||
}
|
||
|
||
if (else_statement != NULL) {
|
||
state->symbols->push_scope();
|
||
else_statement->hir(& stmt->else_instructions, state);
|
||
state->symbols->pop_scope();
|
||
}
|
||
|
||
instructions->push_tail(stmt);
|
||
|
||
/* if-statements do not have r-values.
|
||
*/
|
||
return NULL;
|
||
}
|
||
|
||
|
||
ir_rvalue *
|
||
ast_switch_statement::hir(exec_list *instructions,
|
||
struct _mesa_glsl_parse_state *state)
|
||
{
|
||
void *ctx = state;
|
||
|
||
ir_rvalue *const test_expression =
|
||
this->test_expression->hir(instructions, state);
|
||
|
||
/* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
|
||
*
|
||
* "The type of init-expression in a switch statement must be a
|
||
* scalar integer."
|
||
*/
|
||
if (!test_expression->type->is_scalar() ||
|
||
!test_expression->type->is_integer()) {
|
||
YYLTYPE loc = this->test_expression->get_location();
|
||
|
||
_mesa_glsl_error(& loc,
|
||
state,
|
||
"switch-statement expression must be scalar "
|
||
"integer");
|
||
}
|
||
|
||
/* Track the switch-statement nesting in a stack-like manner.
|
||
*/
|
||
struct glsl_switch_state saved = state->switch_state;
|
||
|
||
state->switch_state.is_switch_innermost = true;
|
||
state->switch_state.switch_nesting_ast = this;
|
||
state->switch_state.labels_ht = hash_table_ctor(0, hash_table_pointer_hash,
|
||
hash_table_pointer_compare);
|
||
state->switch_state.previous_default = NULL;
|
||
|
||
/* Initalize is_fallthru state to false.
|
||
*/
|
||
ir_rvalue *const is_fallthru_val = new (ctx) ir_constant(false);
|
||
state->switch_state.is_fallthru_var =
|
||
new(ctx) ir_variable(glsl_type::bool_type,
|
||
"switch_is_fallthru_tmp",
|
||
ir_var_temporary, glsl_precision_low);
|
||
instructions->push_tail(state->switch_state.is_fallthru_var);
|
||
|
||
ir_dereference_variable *deref_is_fallthru_var =
|
||
new(ctx) ir_dereference_variable(state->switch_state.is_fallthru_var);
|
||
instructions->push_tail(new(ctx) ir_assignment(deref_is_fallthru_var,
|
||
is_fallthru_val));
|
||
|
||
/* Initalize is_break state to false.
|
||
*/
|
||
ir_rvalue *const is_break_val = new (ctx) ir_constant(false);
|
||
state->switch_state.is_break_var =
|
||
new(ctx) ir_variable(glsl_type::bool_type,
|
||
"switch_is_break_tmp",
|
||
ir_var_temporary, glsl_precision_low);
|
||
instructions->push_tail(state->switch_state.is_break_var);
|
||
|
||
ir_dereference_variable *deref_is_break_var =
|
||
new(ctx) ir_dereference_variable(state->switch_state.is_break_var);
|
||
instructions->push_tail(new(ctx) ir_assignment(deref_is_break_var,
|
||
is_break_val));
|
||
|
||
state->switch_state.run_default =
|
||
new(ctx) ir_variable(glsl_type::bool_type,
|
||
"run_default_tmp",
|
||
ir_var_temporary, glsl_precision_low);
|
||
instructions->push_tail(state->switch_state.run_default);
|
||
|
||
/* Cache test expression.
|
||
*/
|
||
test_to_hir(instructions, state);
|
||
|
||
/* Emit code for body of switch stmt.
|
||
*/
|
||
body->hir(instructions, state);
|
||
|
||
hash_table_dtor(state->switch_state.labels_ht);
|
||
|
||
state->switch_state = saved;
|
||
|
||
/* Switch statements do not have r-values. */
|
||
return NULL;
|
||
}
|
||
|
||
|
||
void
|
||
ast_switch_statement::test_to_hir(exec_list *instructions,
|
||
struct _mesa_glsl_parse_state *state)
|
||
{
|
||
void *ctx = state;
|
||
|
||
/* Cache value of test expression. */
|
||
ir_rvalue *const test_val =
|
||
test_expression->hir(instructions,
|
||
state);
|
||
|
||
state->switch_state.test_var = new(ctx) ir_variable(test_val->type,
|
||
"switch_test_tmp",
|
||
ir_var_temporary, test_val->get_precision());
|
||
ir_dereference_variable *deref_test_var =
|
||
new(ctx) ir_dereference_variable(state->switch_state.test_var);
|
||
|
||
instructions->push_tail(state->switch_state.test_var);
|
||
instructions->push_tail(new(ctx) ir_assignment(deref_test_var, test_val));
|
||
}
|
||
|
||
|
||
ir_rvalue *
|
||
ast_switch_body::hir(exec_list *instructions,
|
||
struct _mesa_glsl_parse_state *state)
|
||
{
|
||
if (stmts != NULL)
|
||
stmts->hir(instructions, state);
|
||
|
||
/* Switch bodies do not have r-values. */
|
||
return NULL;
|
||
}
|
||
|
||
ir_rvalue *
|
||
ast_case_statement_list::hir(exec_list *instructions,
|
||
struct _mesa_glsl_parse_state *state)
|
||
{
|
||
exec_list default_case, after_default, tmp;
|
||
|
||
foreach_list_typed (ast_case_statement, case_stmt, link, & this->cases) {
|
||
case_stmt->hir(&tmp, state);
|
||
|
||
/* Default case. */
|
||
if (state->switch_state.previous_default && default_case.is_empty()) {
|
||
default_case.append_list(&tmp);
|
||
continue;
|
||
}
|
||
|
||
/* If default case found, append 'after_default' list. */
|
||
if (!default_case.is_empty())
|
||
after_default.append_list(&tmp);
|
||
else
|
||
instructions->append_list(&tmp);
|
||
}
|
||
|
||
/* Handle the default case. This is done here because default might not be
|
||
* the last case. We need to add checks against following cases first to see
|
||
* if default should be chosen or not.
|
||
*/
|
||
if (!default_case.is_empty()) {
|
||
|
||
ir_rvalue *const true_val = new (state) ir_constant(true);
|
||
ir_dereference_variable *deref_run_default_var =
|
||
new(state) ir_dereference_variable(state->switch_state.run_default);
|
||
|
||
/* Choose to run default case initially, following conditional
|
||
* assignments might change this.
|
||
*/
|
||
ir_assignment *const init_var =
|
||
new(state) ir_assignment(deref_run_default_var, true_val);
|
||
instructions->push_tail(init_var);
|
||
|
||
/* Default case was the last one, no checks required. */
|
||
if (after_default.is_empty()) {
|
||
instructions->append_list(&default_case);
|
||
return NULL;
|
||
}
|
||
|
||
foreach_in_list(ir_instruction, ir, &after_default) {
|
||
ir_assignment *assign = ir->as_assignment();
|
||
|
||
if (!assign)
|
||
continue;
|
||
|
||
/* Clone the check between case label and init expression. */
|
||
ir_expression *exp = (ir_expression*) assign->condition;
|
||
ir_expression *clone = exp->clone(state, NULL);
|
||
|
||
ir_dereference_variable *deref_var =
|
||
new(state) ir_dereference_variable(state->switch_state.run_default);
|
||
ir_rvalue *const false_val = new (state) ir_constant(false);
|
||
|
||
ir_assignment *const set_false =
|
||
new(state) ir_assignment(deref_var, false_val, clone);
|
||
|
||
instructions->push_tail(set_false);
|
||
}
|
||
|
||
/* Append default case and all cases after it. */
|
||
instructions->append_list(&default_case);
|
||
instructions->append_list(&after_default);
|
||
}
|
||
|
||
/* Case statements do not have r-values. */
|
||
return NULL;
|
||
}
|
||
|
||
ir_rvalue *
|
||
ast_case_statement::hir(exec_list *instructions,
|
||
struct _mesa_glsl_parse_state *state)
|
||
{
|
||
labels->hir(instructions, state);
|
||
|
||
/* Conditionally set fallthru state based on break state. */
|
||
ir_constant *const false_val = new(state) ir_constant(false);
|
||
ir_dereference_variable *const deref_is_fallthru_var =
|
||
new(state) ir_dereference_variable(state->switch_state.is_fallthru_var);
|
||
ir_dereference_variable *const deref_is_break_var =
|
||
new(state) ir_dereference_variable(state->switch_state.is_break_var);
|
||
ir_assignment *const reset_fallthru_on_break =
|
||
new(state) ir_assignment(deref_is_fallthru_var,
|
||
false_val,
|
||
deref_is_break_var);
|
||
instructions->push_tail(reset_fallthru_on_break);
|
||
|
||
/* Guard case statements depending on fallthru state. */
|
||
ir_dereference_variable *const deref_fallthru_guard =
|
||
new(state) ir_dereference_variable(state->switch_state.is_fallthru_var);
|
||
ir_if *const test_fallthru = new(state) ir_if(deref_fallthru_guard);
|
||
|
||
foreach_list_typed (ast_node, stmt, link, & this->stmts)
|
||
stmt->hir(& test_fallthru->then_instructions, state);
|
||
|
||
instructions->push_tail(test_fallthru);
|
||
|
||
/* Case statements do not have r-values. */
|
||
return NULL;
|
||
}
|
||
|
||
|
||
ir_rvalue *
|
||
ast_case_label_list::hir(exec_list *instructions,
|
||
struct _mesa_glsl_parse_state *state)
|
||
{
|
||
foreach_list_typed (ast_case_label, label, link, & this->labels)
|
||
label->hir(instructions, state);
|
||
|
||
/* Case labels do not have r-values. */
|
||
return NULL;
|
||
}
|
||
|
||
ir_rvalue *
|
||
ast_case_label::hir(exec_list *instructions,
|
||
struct _mesa_glsl_parse_state *state)
|
||
{
|
||
void *ctx = state;
|
||
|
||
ir_dereference_variable *deref_fallthru_var =
|
||
new(ctx) ir_dereference_variable(state->switch_state.is_fallthru_var);
|
||
|
||
ir_rvalue *const true_val = new(ctx) ir_constant(true);
|
||
|
||
/* If not default case, ... */
|
||
if (this->test_value != NULL) {
|
||
/* Conditionally set fallthru state based on
|
||
* comparison of cached test expression value to case label.
|
||
*/
|
||
ir_rvalue *const label_rval = this->test_value->hir(instructions, state);
|
||
ir_constant *label_const = label_rval->constant_expression_value();
|
||
|
||
if (!label_const) {
|
||
YYLTYPE loc = this->test_value->get_location();
|
||
|
||
_mesa_glsl_error(& loc, state,
|
||
"switch statement case label must be a "
|
||
"constant expression");
|
||
|
||
/* Stuff a dummy value in to allow processing to continue. */
|
||
label_const = new(ctx) ir_constant(0);
|
||
} else {
|
||
ast_expression *previous_label = (ast_expression *)
|
||
hash_table_find(state->switch_state.labels_ht,
|
||
(void *)(uintptr_t)label_const->value.u[0]);
|
||
|
||
if (previous_label) {
|
||
YYLTYPE loc = this->test_value->get_location();
|
||
_mesa_glsl_error(& loc, state, "duplicate case value");
|
||
|
||
loc = previous_label->get_location();
|
||
_mesa_glsl_error(& loc, state, "this is the previous case label");
|
||
} else {
|
||
hash_table_insert(state->switch_state.labels_ht,
|
||
this->test_value,
|
||
(void *)(uintptr_t)label_const->value.u[0]);
|
||
}
|
||
}
|
||
|
||
ir_dereference_variable *deref_test_var =
|
||
new(ctx) ir_dereference_variable(state->switch_state.test_var);
|
||
|
||
ir_expression *test_cond = new(ctx) ir_expression(ir_binop_all_equal,
|
||
label_const,
|
||
deref_test_var);
|
||
|
||
/*
|
||
* From GLSL 4.40 specification section 6.2 ("Selection"):
|
||
*
|
||
* "The type of the init-expression value in a switch statement must
|
||
* be a scalar int or uint. The type of the constant-expression value
|
||
* in a case label also must be a scalar int or uint. When any pair
|
||
* of these values is tested for "equal value" and the types do not
|
||
* match, an implicit conversion will be done to convert the int to a
|
||
* uint (see section 4.1.10 “Implicit Conversions”) before the compare
|
||
* is done."
|
||
*/
|
||
if (label_const->type != state->switch_state.test_var->type) {
|
||
YYLTYPE loc = this->test_value->get_location();
|
||
|
||
const glsl_type *type_a = label_const->type;
|
||
const glsl_type *type_b = state->switch_state.test_var->type;
|
||
|
||
/* Check if int->uint implicit conversion is supported. */
|
||
bool integer_conversion_supported =
|
||
glsl_type::int_type->can_implicitly_convert_to(glsl_type::uint_type,
|
||
state);
|
||
|
||
if ((!type_a->is_integer() || !type_b->is_integer()) ||
|
||
!integer_conversion_supported) {
|
||
_mesa_glsl_error(&loc, state, "type mismatch with switch "
|
||
"init-expression and case label (%s != %s)",
|
||
type_a->name, type_b->name);
|
||
} else {
|
||
/* Conversion of the case label. */
|
||
if (type_a->base_type == GLSL_TYPE_INT) {
|
||
if (!apply_implicit_conversion(glsl_type::uint_type,
|
||
test_cond->operands[0], state))
|
||
_mesa_glsl_error(&loc, state, "implicit type conversion error");
|
||
} else {
|
||
/* Conversion of the init-expression value. */
|
||
if (!apply_implicit_conversion(glsl_type::uint_type,
|
||
test_cond->operands[1], state))
|
||
_mesa_glsl_error(&loc, state, "implicit type conversion error");
|
||
}
|
||
}
|
||
}
|
||
|
||
ir_assignment *set_fallthru_on_test =
|
||
new(ctx) ir_assignment(deref_fallthru_var, true_val, test_cond);
|
||
|
||
instructions->push_tail(set_fallthru_on_test);
|
||
} else { /* default case */
|
||
if (state->switch_state.previous_default) {
|
||
YYLTYPE loc = this->get_location();
|
||
_mesa_glsl_error(& loc, state,
|
||
"multiple default labels in one switch");
|
||
|
||
loc = state->switch_state.previous_default->get_location();
|
||
_mesa_glsl_error(& loc, state, "this is the first default label");
|
||
}
|
||
state->switch_state.previous_default = this;
|
||
|
||
/* Set fallthru condition on 'run_default' bool. */
|
||
ir_dereference_variable *deref_run_default =
|
||
new(ctx) ir_dereference_variable(state->switch_state.run_default);
|
||
ir_rvalue *const cond_true = new(ctx) ir_constant(true);
|
||
ir_expression *test_cond = new(ctx) ir_expression(ir_binop_all_equal,
|
||
cond_true,
|
||
deref_run_default);
|
||
|
||
/* Set falltrhu state. */
|
||
ir_assignment *set_fallthru =
|
||
new(ctx) ir_assignment(deref_fallthru_var, true_val, test_cond);
|
||
|
||
instructions->push_tail(set_fallthru);
|
||
}
|
||
|
||
/* Case statements do not have r-values. */
|
||
return NULL;
|
||
}
|
||
|
||
void
|
||
ast_iteration_statement::condition_to_hir(exec_list *instructions,
|
||
struct _mesa_glsl_parse_state *state)
|
||
{
|
||
void *ctx = state;
|
||
|
||
if (condition != NULL) {
|
||
ir_rvalue *const cond =
|
||
condition->hir(instructions, state);
|
||
|
||
if ((cond == NULL)
|
||
|| !cond->type->is_boolean() || !cond->type->is_scalar()) {
|
||
YYLTYPE loc = condition->get_location();
|
||
|
||
_mesa_glsl_error(& loc, state,
|
||
"loop condition must be scalar boolean");
|
||
} else {
|
||
/* As the first code in the loop body, generate a block that looks
|
||
* like 'if (!condition) break;' as the loop termination condition.
|
||
*/
|
||
ir_rvalue *const not_cond =
|
||
new(ctx) ir_expression(ir_unop_logic_not, cond);
|
||
|
||
ir_if *const if_stmt = new(ctx) ir_if(not_cond);
|
||
|
||
ir_jump *const break_stmt =
|
||
new(ctx) ir_loop_jump(ir_loop_jump::jump_break);
|
||
|
||
if_stmt->then_instructions.push_tail(break_stmt);
|
||
instructions->push_tail(if_stmt);
|
||
}
|
||
}
|
||
}
|
||
|
||
|
||
ir_rvalue *
|
||
ast_iteration_statement::hir(exec_list *instructions,
|
||
struct _mesa_glsl_parse_state *state)
|
||
{
|
||
void *ctx = state;
|
||
|
||
/* For-loops and while-loops start a new scope, but do-while loops do not.
|
||
*/
|
||
if (mode != ast_do_while)
|
||
state->symbols->push_scope();
|
||
|
||
if (init_statement != NULL)
|
||
init_statement->hir(instructions, state);
|
||
|
||
ir_loop *const stmt = new(ctx) ir_loop();
|
||
instructions->push_tail(stmt);
|
||
|
||
/* Track the current loop nesting. */
|
||
ast_iteration_statement *nesting_ast = state->loop_nesting_ast;
|
||
|
||
state->loop_nesting_ast = this;
|
||
|
||
/* Likewise, indicate that following code is closest to a loop,
|
||
* NOT closest to a switch.
|
||
*/
|
||
bool saved_is_switch_innermost = state->switch_state.is_switch_innermost;
|
||
state->switch_state.is_switch_innermost = false;
|
||
|
||
if (mode != ast_do_while)
|
||
condition_to_hir(&stmt->body_instructions, state);
|
||
|
||
if (body != NULL)
|
||
body->hir(& stmt->body_instructions, state);
|
||
|
||
if (rest_expression != NULL)
|
||
rest_expression->hir(& stmt->body_instructions, state);
|
||
|
||
if (mode == ast_do_while)
|
||
condition_to_hir(&stmt->body_instructions, state);
|
||
|
||
if (mode != ast_do_while)
|
||
state->symbols->pop_scope();
|
||
|
||
/* Restore previous nesting before returning. */
|
||
state->loop_nesting_ast = nesting_ast;
|
||
state->switch_state.is_switch_innermost = saved_is_switch_innermost;
|
||
|
||
/* Loops do not have r-values.
|
||
*/
|
||
return NULL;
|
||
}
|
||
|
||
|
||
/**
|
||
* Determine if the given type is valid for establishing a default precision
|
||
* qualifier.
|
||
*
|
||
* From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
|
||
*
|
||
* "The precision statement
|
||
*
|
||
* precision precision-qualifier type;
|
||
*
|
||
* can be used to establish a default precision qualifier. The type field
|
||
* can be either int or float or any of the sampler types, and the
|
||
* precision-qualifier can be lowp, mediump, or highp."
|
||
*
|
||
* GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
|
||
* qualifiers on sampler types, but this seems like an oversight (since the
|
||
* intention of including these in GLSL 1.30 is to allow compatibility with ES
|
||
* shaders). So we allow int, float, and all sampler types regardless of GLSL
|
||
* version.
|
||
*/
|
||
static bool
|
||
is_valid_default_precision_type(const struct glsl_type *const type)
|
||
{
|
||
if (type == NULL)
|
||
return false;
|
||
|
||
switch (type->base_type) {
|
||
case GLSL_TYPE_INT:
|
||
case GLSL_TYPE_FLOAT:
|
||
/* "int" and "float" are valid, but vectors and matrices are not. */
|
||
return type->vector_elements == 1 && type->matrix_columns == 1;
|
||
case GLSL_TYPE_SAMPLER:
|
||
return true;
|
||
default:
|
||
return false;
|
||
}
|
||
}
|
||
|
||
|
||
ir_rvalue *
|
||
ast_type_specifier::hir(exec_list *instructions,
|
||
struct _mesa_glsl_parse_state *state)
|
||
{
|
||
if (this->default_precision == ast_precision_none && this->structure == NULL)
|
||
return NULL;
|
||
|
||
YYLTYPE loc = this->get_location();
|
||
|
||
/* If this is a precision statement, check that the type to which it is
|
||
* applied is either float or int.
|
||
*
|
||
* From section 4.5.3 of the GLSL 1.30 spec:
|
||
* "The precision statement
|
||
* precision precision-qualifier type;
|
||
* can be used to establish a default precision qualifier. The type
|
||
* field can be either int or float [...]. Any other types or
|
||
* qualifiers will result in an error.
|
||
*/
|
||
if (this->default_precision != ast_precision_none) {
|
||
if (!state->check_precision_qualifiers_allowed(&loc))
|
||
return NULL;
|
||
|
||
if (this->structure != NULL) {
|
||
_mesa_glsl_error(&loc, state,
|
||
"precision qualifiers do not apply to structures");
|
||
return NULL;
|
||
}
|
||
|
||
if (this->array_specifier != NULL) {
|
||
_mesa_glsl_error(&loc, state,
|
||
"default precision statements do not apply to "
|
||
"arrays");
|
||
return NULL;
|
||
}
|
||
|
||
const struct glsl_type *const type =
|
||
state->symbols->get_type(this->type_name);
|
||
if (!is_valid_default_precision_type(type)) {
|
||
_mesa_glsl_error(&loc, state,
|
||
"default precision statements apply only to "
|
||
"float, int, and sampler types");
|
||
return NULL;
|
||
}
|
||
|
||
{
|
||
void *ctx = state;
|
||
|
||
const char* precision_type = NULL;
|
||
switch (this->default_precision) {
|
||
case glsl_precision_high: precision_type = "highp"; break;
|
||
case glsl_precision_medium: precision_type = "mediump"; break;
|
||
case glsl_precision_low: precision_type = "lowp"; break;
|
||
case glsl_precision_undefined: precision_type = ""; break;
|
||
}
|
||
char* precision_statement = ralloc_asprintf(ctx, "precision %s %s", precision_type, this->type_name);
|
||
|
||
ir_precision_statement *const stmt = new(ctx) ir_precision_statement(precision_statement);
|
||
|
||
instructions->push_head(stmt);
|
||
}
|
||
|
||
if (type->base_type == GLSL_TYPE_FLOAT
|
||
&& state->es_shader
|
||
&& state->stage == MESA_SHADER_FRAGMENT) {
|
||
/* Section 4.5.3 (Default Precision Qualifiers) of the GLSL ES 1.00
|
||
* spec says:
|
||
*
|
||
* "The fragment language has no default precision qualifier for
|
||
* floating point types."
|
||
*
|
||
* As a result, we have to track whether or not default precision has
|
||
* been specified for float in GLSL ES fragment shaders.
|
||
*
|
||
* Earlier in that same section, the spec says:
|
||
*
|
||
* "Non-precision qualified declarations will use the precision
|
||
* qualifier specified in the most recent precision statement
|
||
* that is still in scope. The precision statement has the same
|
||
* scoping rules as variable declarations. If it is declared
|
||
* inside a compound statement, its effect stops at the end of
|
||
* the innermost statement it was declared in. Precision
|
||
* statements in nested scopes override precision statements in
|
||
* outer scopes. Multiple precision statements for the same basic
|
||
* type can appear inside the same scope, with later statements
|
||
* overriding earlier statements within that scope."
|
||
*
|
||
* Default precision specifications follow the same scope rules as
|
||
* variables. So, we can track the state of the default float
|
||
* precision in the symbol table, and the rules will just work. This
|
||
* is a slight abuse of the symbol table, but it has the semantics
|
||
* that we want.
|
||
*/
|
||
ir_variable *const junk =
|
||
new(state) ir_variable(type, "#default precision",
|
||
ir_var_auto, (glsl_precision)this->default_precision);
|
||
|
||
state->symbols->add_variable(junk);
|
||
state->had_float_precision = true;
|
||
}
|
||
|
||
/* FINISHME: Translate precision statements into IR. */
|
||
return NULL;
|
||
}
|
||
|
||
/* _mesa_ast_set_aggregate_type() sets the <structure> field so that
|
||
* process_record_constructor() can do type-checking on C-style initializer
|
||
* expressions of structs, but ast_struct_specifier should only be translated
|
||
* to HIR if it is declaring the type of a structure.
|
||
*
|
||
* The ->is_declaration field is false for initializers of variables
|
||
* declared separately from the struct's type definition.
|
||
*
|
||
* struct S { ... }; (is_declaration = true)
|
||
* struct T { ... } t = { ... }; (is_declaration = true)
|
||
* S s = { ... }; (is_declaration = false)
|
||
*/
|
||
if (this->structure != NULL && this->structure->is_declaration)
|
||
return this->structure->hir(instructions, state);
|
||
|
||
return NULL;
|
||
}
|
||
|
||
|
||
/**
|
||
* Process a structure or interface block tree into an array of structure fields
|
||
*
|
||
* After parsing, where there are some syntax differnces, structures and
|
||
* interface blocks are almost identical. They are similar enough that the
|
||
* AST for each can be processed the same way into a set of
|
||
* \c glsl_struct_field to describe the members.
|
||
*
|
||
* If we're processing an interface block, var_mode should be the type of the
|
||
* interface block (ir_var_shader_in, ir_var_shader_out, or ir_var_uniform).
|
||
* If we're processing a structure, var_mode should be ir_var_auto.
|
||
*
|
||
* \return
|
||
* The number of fields processed. A pointer to the array structure fields is
|
||
* stored in \c *fields_ret.
|
||
*/
|
||
unsigned
|
||
ast_process_structure_or_interface_block(exec_list *instructions,
|
||
struct _mesa_glsl_parse_state *state,
|
||
exec_list *declarations,
|
||
YYLTYPE &loc,
|
||
glsl_struct_field **fields_ret,
|
||
bool is_interface,
|
||
enum glsl_matrix_layout matrix_layout,
|
||
bool allow_reserved_names,
|
||
ir_variable_mode var_mode)
|
||
{
|
||
unsigned decl_count = 0;
|
||
|
||
/* Make an initial pass over the list of fields to determine how
|
||
* many there are. Each element in this list is an ast_declarator_list.
|
||
* This means that we actually need to count the number of elements in the
|
||
* 'declarations' list in each of the elements.
|
||
*/
|
||
foreach_list_typed (ast_declarator_list, decl_list, link, declarations) {
|
||
decl_count += decl_list->declarations.length();
|
||
}
|
||
|
||
/* Allocate storage for the fields and process the field
|
||
* declarations. As the declarations are processed, try to also convert
|
||
* the types to HIR. This ensures that structure definitions embedded in
|
||
* other structure definitions or in interface blocks are processed.
|
||
*/
|
||
glsl_struct_field *const fields = ralloc_array(state, glsl_struct_field,
|
||
decl_count);
|
||
|
||
unsigned i = 0;
|
||
foreach_list_typed (ast_declarator_list, decl_list, link, declarations) {
|
||
const char *type_name;
|
||
|
||
decl_list->type->specifier->hir(instructions, state);
|
||
|
||
/* Section 10.9 of the GLSL ES 1.00 specification states that
|
||
* embedded structure definitions have been removed from the language.
|
||
*/
|
||
if (state->es_shader && decl_list->type->specifier->structure != NULL) {
|
||
_mesa_glsl_error(&loc, state, "embedded structure definitions are "
|
||
"not allowed in GLSL ES 1.00");
|
||
}
|
||
|
||
const glsl_type *decl_type =
|
||
decl_list->type->glsl_type(& type_name, state);
|
||
|
||
foreach_list_typed (ast_declaration, decl, link,
|
||
&decl_list->declarations) {
|
||
if (!allow_reserved_names)
|
||
validate_identifier(decl->identifier, loc, state);
|
||
|
||
/* From section 4.3.9 of the GLSL 4.40 spec:
|
||
*
|
||
* "[In interface blocks] opaque types are not allowed."
|
||
*
|
||
* It should be impossible for decl_type to be NULL here. Cases that
|
||
* might naturally lead to decl_type being NULL, especially for the
|
||
* is_interface case, will have resulted in compilation having
|
||
* already halted due to a syntax error.
|
||
*/
|
||
const struct glsl_type *field_type =
|
||
decl_type != NULL ? decl_type : glsl_type::error_type;
|
||
|
||
if (is_interface && field_type->contains_opaque()) {
|
||
YYLTYPE loc = decl_list->get_location();
|
||
_mesa_glsl_error(&loc, state,
|
||
"uniform in non-default uniform block contains "
|
||
"opaque variable");
|
||
}
|
||
|
||
if (field_type->contains_atomic()) {
|
||
/* FINISHME: Add a spec quotation here once updated spec
|
||
* FINISHME: language is available. See Khronos bug #10903
|
||
* FINISHME: on whether atomic counters are allowed in
|
||
* FINISHME: structures.
|
||
*/
|
||
YYLTYPE loc = decl_list->get_location();
|
||
_mesa_glsl_error(&loc, state, "atomic counter in structure or "
|
||
"uniform block");
|
||
}
|
||
|
||
if (field_type->contains_image()) {
|
||
/* FINISHME: Same problem as with atomic counters.
|
||
* FINISHME: Request clarification from Khronos and add
|
||
* FINISHME: spec quotation here.
|
||
*/
|
||
YYLTYPE loc = decl_list->get_location();
|
||
_mesa_glsl_error(&loc, state,
|
||
"image in structure or uniform block");
|
||
}
|
||
|
||
const struct ast_type_qualifier *const qual =
|
||
& decl_list->type->qualifier;
|
||
if (qual->flags.q.std140 ||
|
||
qual->flags.q.packed ||
|
||
qual->flags.q.shared) {
|
||
_mesa_glsl_error(&loc, state,
|
||
"uniform block layout qualifiers std140, packed, and "
|
||
"shared can only be applied to uniform blocks, not "
|
||
"members");
|
||
}
|
||
|
||
field_type = process_array_type(&loc, decl_type,
|
||
decl->array_specifier, state);
|
||
fields[i].type = field_type;
|
||
fields[i].name = decl->identifier;
|
||
fields[i].precision = (glsl_precision)decl_list->type->qualifier.precision;
|
||
fields[i].location = -1;
|
||
fields[i].interpolation =
|
||
interpret_interpolation_qualifier(qual, var_mode, state, &loc);
|
||
fields[i].centroid = qual->flags.q.centroid ? 1 : 0;
|
||
fields[i].sample = qual->flags.q.sample ? 1 : 0;
|
||
|
||
/* Only save explicitly defined streams in block's field */
|
||
fields[i].stream = qual->flags.q.explicit_stream ? qual->stream : -1;
|
||
|
||
if (qual->flags.q.row_major || qual->flags.q.column_major) {
|
||
if (!qual->flags.q.uniform) {
|
||
_mesa_glsl_error(&loc, state,
|
||
"row_major and column_major can only be "
|
||
"applied to uniform interface blocks");
|
||
} else
|
||
validate_matrix_layout_for_type(state, &loc, field_type, NULL);
|
||
}
|
||
|
||
if (qual->flags.q.uniform && qual->has_interpolation()) {
|
||
_mesa_glsl_error(&loc, state,
|
||
"interpolation qualifiers cannot be used "
|
||
"with uniform interface blocks");
|
||
}
|
||
|
||
if ((qual->flags.q.uniform || !is_interface) &&
|
||
qual->has_auxiliary_storage()) {
|
||
_mesa_glsl_error(&loc, state,
|
||
"auxiliary storage qualifiers cannot be used "
|
||
"in uniform blocks or structures.");
|
||
}
|
||
|
||
/* Propogate row- / column-major information down the fields of the
|
||
* structure or interface block. Structures need this data because
|
||
* the structure may contain a structure that contains ... a matrix
|
||
* that need the proper layout.
|
||
*/
|
||
if (field_type->without_array()->is_matrix()
|
||
|| field_type->without_array()->is_record()) {
|
||
/* If no layout is specified for the field, inherit the layout
|
||
* from the block.
|
||
*/
|
||
fields[i].matrix_layout = matrix_layout;
|
||
|
||
if (qual->flags.q.row_major)
|
||
fields[i].matrix_layout = GLSL_MATRIX_LAYOUT_ROW_MAJOR;
|
||
else if (qual->flags.q.column_major)
|
||
fields[i].matrix_layout = GLSL_MATRIX_LAYOUT_COLUMN_MAJOR;
|
||
|
||
/* If we're processing an interface block, the matrix layout must
|
||
* be decided by this point.
|
||
*/
|
||
assert(!is_interface
|
||
|| fields[i].matrix_layout == GLSL_MATRIX_LAYOUT_ROW_MAJOR
|
||
|| fields[i].matrix_layout == GLSL_MATRIX_LAYOUT_COLUMN_MAJOR);
|
||
}
|
||
|
||
i++;
|
||
}
|
||
}
|
||
|
||
assert(i == decl_count);
|
||
|
||
*fields_ret = fields;
|
||
return decl_count;
|
||
}
|
||
|
||
|
||
ir_rvalue *
|
||
ast_struct_specifier::hir(exec_list *instructions,
|
||
struct _mesa_glsl_parse_state *state)
|
||
{
|
||
YYLTYPE loc = this->get_location();
|
||
|
||
/* Section 4.1.8 (Structures) of the GLSL 1.10 spec says:
|
||
*
|
||
* "Anonymous structures are not supported; so embedded structures must
|
||
* have a declarator. A name given to an embedded struct is scoped at
|
||
* the same level as the struct it is embedded in."
|
||
*
|
||
* The same section of the GLSL 1.20 spec says:
|
||
*
|
||
* "Anonymous structures are not supported. Embedded structures are not
|
||
* supported.
|
||
*
|
||
* struct S { float f; };
|
||
* struct T {
|
||
* S; // Error: anonymous structures disallowed
|
||
* struct { ... }; // Error: embedded structures disallowed
|
||
* S s; // Okay: nested structures with name are allowed
|
||
* };"
|
||
*
|
||
* The GLSL ES 1.00 and 3.00 specs have similar langauge and examples. So,
|
||
* we allow embedded structures in 1.10 only.
|
||
*/
|
||
if (state->language_version != 110 && state->struct_specifier_depth != 0)
|
||
_mesa_glsl_error(&loc, state,
|
||
"embedded structure declarations are not allowed");
|
||
|
||
state->struct_specifier_depth++;
|
||
|
||
glsl_struct_field *fields;
|
||
unsigned decl_count =
|
||
ast_process_structure_or_interface_block(instructions,
|
||
state,
|
||
&this->declarations,
|
||
loc,
|
||
&fields,
|
||
false,
|
||
GLSL_MATRIX_LAYOUT_INHERITED,
|
||
false /* allow_reserved_names */,
|
||
ir_var_auto);
|
||
|
||
validate_identifier(this->name, loc, state);
|
||
|
||
const glsl_type *t =
|
||
glsl_type::get_record_instance(fields, decl_count, this->name);
|
||
|
||
if (!state->symbols->add_type(name, t)) {
|
||
_mesa_glsl_error(& loc, state, "struct `%s' previously defined", name);
|
||
} else {
|
||
const glsl_type **s = reralloc(state, state->user_structures,
|
||
const glsl_type *,
|
||
state->num_user_structures + 1);
|
||
if (s != NULL) {
|
||
s[state->num_user_structures] = t;
|
||
state->user_structures = s;
|
||
state->num_user_structures++;
|
||
ir_typedecl_statement* stmt = new(state) ir_typedecl_statement(t);
|
||
|
||
/* Push the struct declarations to the top.
|
||
* However, do not insert declarations before default precision
|
||
* statements or other declarations
|
||
*/
|
||
ir_instruction* before_node = (ir_instruction*)instructions->head;
|
||
while (before_node &&
|
||
(before_node->ir_type == ir_type_precision ||
|
||
before_node->ir_type == ir_type_typedecl))
|
||
before_node = (ir_instruction*)before_node->next;
|
||
if (before_node)
|
||
before_node->insert_before(stmt);
|
||
else
|
||
instructions->push_head(stmt);
|
||
}
|
||
}
|
||
|
||
state->struct_specifier_depth--;
|
||
|
||
/* Structure type definitions do not have r-values.
|
||
*/
|
||
return NULL;
|
||
}
|
||
|
||
|
||
/**
|
||
* Visitor class which detects whether a given interface block has been used.
|
||
*/
|
||
class interface_block_usage_visitor : public ir_hierarchical_visitor
|
||
{
|
||
public:
|
||
interface_block_usage_visitor(ir_variable_mode mode, const glsl_type *block)
|
||
: mode(mode), block(block), found(false)
|
||
{
|
||
}
|
||
|
||
virtual ir_visitor_status visit(ir_dereference_variable *ir)
|
||
{
|
||
if (ir->var->data.mode == mode && ir->var->get_interface_type() == block) {
|
||
found = true;
|
||
return visit_stop;
|
||
}
|
||
return visit_continue;
|
||
}
|
||
|
||
bool usage_found() const
|
||
{
|
||
return this->found;
|
||
}
|
||
|
||
private:
|
||
ir_variable_mode mode;
|
||
const glsl_type *block;
|
||
bool found;
|
||
};
|
||
|
||
|
||
ir_rvalue *
|
||
ast_interface_block::hir(exec_list *instructions,
|
||
struct _mesa_glsl_parse_state *state)
|
||
{
|
||
YYLTYPE loc = this->get_location();
|
||
|
||
/* The ast_interface_block has a list of ast_declarator_lists. We
|
||
* need to turn those into ir_variables with an association
|
||
* with this uniform block.
|
||
*/
|
||
enum glsl_interface_packing packing;
|
||
if (this->layout.flags.q.shared) {
|
||
packing = GLSL_INTERFACE_PACKING_SHARED;
|
||
} else if (this->layout.flags.q.packed) {
|
||
packing = GLSL_INTERFACE_PACKING_PACKED;
|
||
} else {
|
||
/* The default layout is std140.
|
||
*/
|
||
packing = GLSL_INTERFACE_PACKING_STD140;
|
||
}
|
||
|
||
ir_variable_mode var_mode;
|
||
const char *iface_type_name;
|
||
if (this->layout.flags.q.in) {
|
||
var_mode = ir_var_shader_in;
|
||
iface_type_name = "in";
|
||
} else if (this->layout.flags.q.out) {
|
||
var_mode = ir_var_shader_out;
|
||
iface_type_name = "out";
|
||
} else if (this->layout.flags.q.uniform) {
|
||
var_mode = ir_var_uniform;
|
||
iface_type_name = "uniform";
|
||
} else {
|
||
var_mode = ir_var_auto;
|
||
iface_type_name = "UNKNOWN";
|
||
assert(!"interface block layout qualifier not found!");
|
||
}
|
||
|
||
enum glsl_matrix_layout matrix_layout = GLSL_MATRIX_LAYOUT_INHERITED;
|
||
if (this->layout.flags.q.row_major)
|
||
matrix_layout = GLSL_MATRIX_LAYOUT_ROW_MAJOR;
|
||
else if (this->layout.flags.q.column_major)
|
||
matrix_layout = GLSL_MATRIX_LAYOUT_COLUMN_MAJOR;
|
||
|
||
bool redeclaring_per_vertex = strcmp(this->block_name, "gl_PerVertex") == 0;
|
||
exec_list declared_variables;
|
||
glsl_struct_field *fields;
|
||
|
||
/* Treat an interface block as one level of nesting, so that embedded struct
|
||
* specifiers will be disallowed.
|
||
*/
|
||
state->struct_specifier_depth++;
|
||
|
||
unsigned int num_variables =
|
||
ast_process_structure_or_interface_block(&declared_variables,
|
||
state,
|
||
&this->declarations,
|
||
loc,
|
||
&fields,
|
||
true,
|
||
matrix_layout,
|
||
redeclaring_per_vertex,
|
||
var_mode);
|
||
|
||
state->struct_specifier_depth--;
|
||
|
||
if (!redeclaring_per_vertex)
|
||
validate_identifier(this->block_name, loc, state);
|
||
|
||
const glsl_type *earlier_per_vertex = NULL;
|
||
if (redeclaring_per_vertex) {
|
||
/* Find the previous declaration of gl_PerVertex. If we're redeclaring
|
||
* the named interface block gl_in, we can find it by looking at the
|
||
* previous declaration of gl_in. Otherwise we can find it by looking
|
||
* at the previous decalartion of any of the built-in outputs,
|
||
* e.g. gl_Position.
|
||
*
|
||
* Also check that the instance name and array-ness of the redeclaration
|
||
* are correct.
|
||
*/
|
||
switch (var_mode) {
|
||
case ir_var_shader_in:
|
||
if (ir_variable *earlier_gl_in =
|
||
state->symbols->get_variable("gl_in")) {
|
||
earlier_per_vertex = earlier_gl_in->get_interface_type();
|
||
} else {
|
||
_mesa_glsl_error(&loc, state,
|
||
"redeclaration of gl_PerVertex input not allowed "
|
||
"in the %s shader",
|
||
_mesa_shader_stage_to_string(state->stage));
|
||
}
|
||
if (this->instance_name == NULL ||
|
||
strcmp(this->instance_name, "gl_in") != 0 || this->array_specifier == NULL) {
|
||
_mesa_glsl_error(&loc, state,
|
||
"gl_PerVertex input must be redeclared as "
|
||
"gl_in[]");
|
||
}
|
||
break;
|
||
case ir_var_shader_out:
|
||
if (ir_variable *earlier_gl_Position =
|
||
state->symbols->get_variable("gl_Position")) {
|
||
earlier_per_vertex = earlier_gl_Position->get_interface_type();
|
||
} else {
|
||
_mesa_glsl_error(&loc, state,
|
||
"redeclaration of gl_PerVertex output not "
|
||
"allowed in the %s shader",
|
||
_mesa_shader_stage_to_string(state->stage));
|
||
}
|
||
if (this->instance_name != NULL) {
|
||
_mesa_glsl_error(&loc, state,
|
||
"gl_PerVertex output may not be redeclared with "
|
||
"an instance name");
|
||
}
|
||
break;
|
||
default:
|
||
_mesa_glsl_error(&loc, state,
|
||
"gl_PerVertex must be declared as an input or an "
|
||
"output");
|
||
break;
|
||
}
|
||
|
||
if (earlier_per_vertex == NULL) {
|
||
/* An error has already been reported. Bail out to avoid null
|
||
* dereferences later in this function.
|
||
*/
|
||
return NULL;
|
||
}
|
||
|
||
/* Copy locations from the old gl_PerVertex interface block. */
|
||
for (unsigned i = 0; i < num_variables; i++) {
|
||
int j = earlier_per_vertex->field_index(fields[i].name);
|
||
if (j == -1) {
|
||
_mesa_glsl_error(&loc, state,
|
||
"redeclaration of gl_PerVertex must be a subset "
|
||
"of the built-in members of gl_PerVertex");
|
||
} else {
|
||
fields[i].location =
|
||
earlier_per_vertex->fields.structure[j].location;
|
||
fields[i].interpolation =
|
||
earlier_per_vertex->fields.structure[j].interpolation;
|
||
fields[i].centroid =
|
||
earlier_per_vertex->fields.structure[j].centroid;
|
||
fields[i].sample =
|
||
earlier_per_vertex->fields.structure[j].sample;
|
||
}
|
||
}
|
||
|
||
/* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10
|
||
* spec:
|
||
*
|
||
* If a built-in interface block is redeclared, it must appear in
|
||
* the shader before any use of any member included in the built-in
|
||
* declaration, or a compilation error will result.
|
||
*
|
||
* This appears to be a clarification to the behaviour established for
|
||
* gl_PerVertex by GLSL 1.50, therefore we implement this behaviour
|
||
* regardless of GLSL version.
|
||
*/
|
||
interface_block_usage_visitor v(var_mode, earlier_per_vertex);
|
||
v.run(instructions);
|
||
if (v.usage_found()) {
|
||
_mesa_glsl_error(&loc, state,
|
||
"redeclaration of a built-in interface block must "
|
||
"appear before any use of any member of the "
|
||
"interface block");
|
||
}
|
||
}
|
||
|
||
const glsl_type *block_type =
|
||
glsl_type::get_interface_instance(fields,
|
||
num_variables,
|
||
packing,
|
||
this->block_name);
|
||
|
||
if (!state->symbols->add_interface(block_type->name, block_type, var_mode)) {
|
||
YYLTYPE loc = this->get_location();
|
||
_mesa_glsl_error(&loc, state, "interface block `%s' with type `%s' "
|
||
"already taken in the current scope",
|
||
this->block_name, iface_type_name);
|
||
}
|
||
|
||
/* Since interface blocks cannot contain statements, it should be
|
||
* impossible for the block to generate any instructions.
|
||
*/
|
||
assert(declared_variables.is_empty());
|
||
|
||
/* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
|
||
*
|
||
* Geometry shader input variables get the per-vertex values written
|
||
* out by vertex shader output variables of the same names. Since a
|
||
* geometry shader operates on a set of vertices, each input varying
|
||
* variable (or input block, see interface blocks below) needs to be
|
||
* declared as an array.
|
||
*/
|
||
if (state->stage == MESA_SHADER_GEOMETRY && this->array_specifier == NULL &&
|
||
var_mode == ir_var_shader_in) {
|
||
_mesa_glsl_error(&loc, state, "geometry shader inputs must be arrays");
|
||
}
|
||
|
||
/* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
|
||
* says:
|
||
*
|
||
* "If an instance name (instance-name) is used, then it puts all the
|
||
* members inside a scope within its own name space, accessed with the
|
||
* field selector ( . ) operator (analogously to structures)."
|
||
*/
|
||
if (this->instance_name) {
|
||
if (redeclaring_per_vertex) {
|
||
/* When a built-in in an unnamed interface block is redeclared,
|
||
* get_variable_being_redeclared() calls
|
||
* check_builtin_array_max_size() to make sure that built-in array
|
||
* variables aren't redeclared to illegal sizes. But we're looking
|
||
* at a redeclaration of a named built-in interface block. So we
|
||
* have to manually call check_builtin_array_max_size() for all parts
|
||
* of the interface that are arrays.
|
||
*/
|
||
for (unsigned i = 0; i < num_variables; i++) {
|
||
if (fields[i].type->is_array()) {
|
||
const unsigned size = fields[i].type->array_size();
|
||
check_builtin_array_max_size(fields[i].name, size, loc, state);
|
||
}
|
||
}
|
||
} else {
|
||
validate_identifier(this->instance_name, loc, state);
|
||
}
|
||
|
||
ir_variable *var;
|
||
|
||
if (this->array_specifier != NULL) {
|
||
/* Section 4.3.7 (Interface Blocks) of the GLSL 1.50 spec says:
|
||
*
|
||
* For uniform blocks declared an array, each individual array
|
||
* element corresponds to a separate buffer object backing one
|
||
* instance of the block. As the array size indicates the number
|
||
* of buffer objects needed, uniform block array declarations
|
||
* must specify an array size.
|
||
*
|
||
* And a few paragraphs later:
|
||
*
|
||
* Geometry shader input blocks must be declared as arrays and
|
||
* follow the array declaration and linking rules for all
|
||
* geometry shader inputs. All other input and output block
|
||
* arrays must specify an array size.
|
||
*
|
||
* The upshot of this is that the only circumstance where an
|
||
* interface array size *doesn't* need to be specified is on a
|
||
* geometry shader input.
|
||
*/
|
||
if (this->array_specifier->is_unsized_array &&
|
||
(state->stage != MESA_SHADER_GEOMETRY || !this->layout.flags.q.in)) {
|
||
_mesa_glsl_error(&loc, state,
|
||
"only geometry shader inputs may be unsized "
|
||
"instance block arrays");
|
||
|
||
}
|
||
|
||
const glsl_type *block_array_type =
|
||
process_array_type(&loc, block_type, this->array_specifier, state);
|
||
|
||
var = new(state) ir_variable(block_array_type,
|
||
this->instance_name,
|
||
var_mode, glsl_precision_undefined);
|
||
} else {
|
||
var = new(state) ir_variable(block_type,
|
||
this->instance_name,
|
||
var_mode, glsl_precision_undefined);
|
||
}
|
||
|
||
var->data.matrix_layout = matrix_layout == GLSL_MATRIX_LAYOUT_INHERITED
|
||
? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR : matrix_layout;
|
||
|
||
if (state->stage == MESA_SHADER_GEOMETRY && var_mode == ir_var_shader_in)
|
||
handle_geometry_shader_input_decl(state, loc, var);
|
||
|
||
if (ir_variable *earlier =
|
||
state->symbols->get_variable(this->instance_name)) {
|
||
if (!redeclaring_per_vertex) {
|
||
_mesa_glsl_error(&loc, state, "`%s' redeclared",
|
||
this->instance_name);
|
||
}
|
||
earlier->data.how_declared = ir_var_declared_normally;
|
||
earlier->type = var->type;
|
||
earlier->reinit_interface_type(block_type);
|
||
delete var;
|
||
} else {
|
||
/* Propagate the "binding" keyword into this UBO's fields;
|
||
* the UBO declaration itself doesn't get an ir_variable unless it
|
||
* has an instance name. This is ugly.
|
||
*/
|
||
var->data.explicit_binding = this->layout.flags.q.explicit_binding;
|
||
var->data.binding = this->layout.binding;
|
||
|
||
state->symbols->add_variable(var);
|
||
instructions->push_tail(var);
|
||
}
|
||
} else {
|
||
/* In order to have an array size, the block must also be declared with
|
||
* an instance name.
|
||
*/
|
||
assert(this->array_specifier == NULL);
|
||
|
||
for (unsigned i = 0; i < num_variables; i++) {
|
||
ir_variable *var =
|
||
new(state) ir_variable(fields[i].type,
|
||
ralloc_strdup(state, fields[i].name),
|
||
var_mode, fields[i].precision);
|
||
var->data.interpolation = fields[i].interpolation;
|
||
var->data.centroid = fields[i].centroid;
|
||
var->data.sample = fields[i].sample;
|
||
var->init_interface_type(block_type);
|
||
|
||
if (fields[i].matrix_layout == GLSL_MATRIX_LAYOUT_INHERITED) {
|
||
var->data.matrix_layout = matrix_layout == GLSL_MATRIX_LAYOUT_INHERITED
|
||
? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR : matrix_layout;
|
||
} else {
|
||
var->data.matrix_layout = fields[i].matrix_layout;
|
||
}
|
||
|
||
if (fields[i].stream != -1 &&
|
||
((unsigned)fields[i].stream) != this->layout.stream) {
|
||
_mesa_glsl_error(&loc, state,
|
||
"stream layout qualifier on "
|
||
"interface block member `%s' does not match "
|
||
"the interface block (%d vs %d)",
|
||
var->name, fields[i].stream, this->layout.stream);
|
||
}
|
||
|
||
var->data.stream = this->layout.stream;
|
||
|
||
if (redeclaring_per_vertex) {
|
||
ir_variable *earlier =
|
||
get_variable_being_redeclared(var, loc, state,
|
||
true /* allow_all_redeclarations */);
|
||
if (!is_gl_identifier(var->name) || earlier == NULL) {
|
||
_mesa_glsl_error(&loc, state,
|
||
"redeclaration of gl_PerVertex can only "
|
||
"include built-in variables");
|
||
} else if (earlier->data.how_declared == ir_var_declared_normally) {
|
||
_mesa_glsl_error(&loc, state,
|
||
"`%s' has already been redeclared", var->name);
|
||
} else {
|
||
earlier->data.how_declared = ir_var_declared_in_block;
|
||
earlier->reinit_interface_type(block_type);
|
||
}
|
||
continue;
|
||
}
|
||
|
||
if (state->symbols->get_variable(var->name) != NULL)
|
||
_mesa_glsl_error(&loc, state, "`%s' redeclared", var->name);
|
||
|
||
/* Propagate the "binding" keyword into this UBO's fields;
|
||
* the UBO declaration itself doesn't get an ir_variable unless it
|
||
* has an instance name. This is ugly.
|
||
*/
|
||
var->data.explicit_binding = this->layout.flags.q.explicit_binding;
|
||
var->data.binding = this->layout.binding;
|
||
|
||
state->symbols->add_variable(var);
|
||
instructions->push_tail(var);
|
||
}
|
||
|
||
if (redeclaring_per_vertex && block_type != earlier_per_vertex) {
|
||
/* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10 spec:
|
||
*
|
||
* It is also a compilation error ... to redeclare a built-in
|
||
* block and then use a member from that built-in block that was
|
||
* not included in the redeclaration.
|
||
*
|
||
* This appears to be a clarification to the behaviour established
|
||
* for gl_PerVertex by GLSL 1.50, therefore we implement this
|
||
* behaviour regardless of GLSL version.
|
||
*
|
||
* To prevent the shader from using a member that was not included in
|
||
* the redeclaration, we disable any ir_variables that are still
|
||
* associated with the old declaration of gl_PerVertex (since we've
|
||
* already updated all of the variables contained in the new
|
||
* gl_PerVertex to point to it).
|
||
*
|
||
* As a side effect this will prevent
|
||
* validate_intrastage_interface_blocks() from getting confused and
|
||
* thinking there are conflicting definitions of gl_PerVertex in the
|
||
* shader.
|
||
*/
|
||
foreach_in_list_safe(ir_instruction, node, instructions) {
|
||
ir_variable *const var = node->as_variable();
|
||
if (var != NULL &&
|
||
var->get_interface_type() == earlier_per_vertex &&
|
||
var->data.mode == var_mode) {
|
||
if (var->data.how_declared == ir_var_declared_normally) {
|
||
_mesa_glsl_error(&loc, state,
|
||
"redeclaration of gl_PerVertex cannot "
|
||
"follow a redeclaration of `%s'",
|
||
var->name);
|
||
}
|
||
state->symbols->disable_variable(var->name);
|
||
var->remove();
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
return NULL;
|
||
}
|
||
|
||
|
||
ir_rvalue *
|
||
ast_gs_input_layout::hir(exec_list *instructions,
|
||
struct _mesa_glsl_parse_state *state)
|
||
{
|
||
YYLTYPE loc = this->get_location();
|
||
|
||
/* If any geometry input layout declaration preceded this one, make sure it
|
||
* was consistent with this one.
|
||
*/
|
||
if (state->gs_input_prim_type_specified &&
|
||
state->in_qualifier->prim_type != this->prim_type) {
|
||
_mesa_glsl_error(&loc, state,
|
||
"geometry shader input layout does not match"
|
||
" previous declaration");
|
||
return NULL;
|
||
}
|
||
|
||
/* If any shader inputs occurred before this declaration and specified an
|
||
* array size, make sure the size they specified is consistent with the
|
||
* primitive type.
|
||
*/
|
||
unsigned num_vertices = vertices_per_prim(this->prim_type);
|
||
if (state->gs_input_size != 0 && state->gs_input_size != num_vertices) {
|
||
_mesa_glsl_error(&loc, state,
|
||
"this geometry shader input layout implies %u vertices"
|
||
" per primitive, but a previous input is declared"
|
||
" with size %u", num_vertices, state->gs_input_size);
|
||
return NULL;
|
||
}
|
||
|
||
state->gs_input_prim_type_specified = true;
|
||
|
||
/* If any shader inputs occurred before this declaration and did not
|
||
* specify an array size, their size is determined now.
|
||
*/
|
||
foreach_in_list(ir_instruction, node, instructions) {
|
||
ir_variable *var = node->as_variable();
|
||
if (var == NULL || var->data.mode != ir_var_shader_in)
|
||
continue;
|
||
|
||
/* Note: gl_PrimitiveIDIn has mode ir_var_shader_in, but it's not an
|
||
* array; skip it.
|
||
*/
|
||
|
||
if (var->type->is_unsized_array()) {
|
||
if (var->data.max_array_access >= num_vertices) {
|
||
_mesa_glsl_error(&loc, state,
|
||
"this geometry shader input layout implies %u"
|
||
" vertices, but an access to element %u of input"
|
||
" `%s' already exists", num_vertices,
|
||
var->data.max_array_access, var->name);
|
||
} else {
|
||
var->type = glsl_type::get_array_instance(var->type->fields.array,
|
||
num_vertices);
|
||
}
|
||
}
|
||
}
|
||
|
||
return NULL;
|
||
}
|
||
|
||
|
||
ir_rvalue *
|
||
ast_cs_input_layout::hir(exec_list *instructions,
|
||
struct _mesa_glsl_parse_state *state)
|
||
{
|
||
YYLTYPE loc = this->get_location();
|
||
|
||
/* If any compute input layout declaration preceded this one, make sure it
|
||
* was consistent with this one.
|
||
*/
|
||
if (state->cs_input_local_size_specified) {
|
||
for (int i = 0; i < 3; i++) {
|
||
if (state->cs_input_local_size[i] != this->local_size[i]) {
|
||
_mesa_glsl_error(&loc, state,
|
||
"compute shader input layout does not match"
|
||
" previous declaration");
|
||
return NULL;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* From the ARB_compute_shader specification:
|
||
*
|
||
* If the local size of the shader in any dimension is greater
|
||
* than the maximum size supported by the implementation for that
|
||
* dimension, a compile-time error results.
|
||
*
|
||
* It is not clear from the spec how the error should be reported if
|
||
* the total size of the work group exceeds
|
||
* MAX_COMPUTE_WORK_GROUP_INVOCATIONS, but it seems reasonable to
|
||
* report it at compile time as well.
|
||
*/
|
||
GLuint64 total_invocations = 1;
|
||
for (int i = 0; i < 3; i++) {
|
||
if (this->local_size[i] > state->ctx->Const.MaxComputeWorkGroupSize[i]) {
|
||
_mesa_glsl_error(&loc, state,
|
||
"local_size_%c exceeds MAX_COMPUTE_WORK_GROUP_SIZE"
|
||
" (%d)", 'x' + i,
|
||
state->ctx->Const.MaxComputeWorkGroupSize[i]);
|
||
break;
|
||
}
|
||
total_invocations *= this->local_size[i];
|
||
if (total_invocations >
|
||
state->ctx->Const.MaxComputeWorkGroupInvocations) {
|
||
_mesa_glsl_error(&loc, state,
|
||
"product of local_sizes exceeds "
|
||
"MAX_COMPUTE_WORK_GROUP_INVOCATIONS (%d)",
|
||
state->ctx->Const.MaxComputeWorkGroupInvocations);
|
||
break;
|
||
}
|
||
}
|
||
|
||
state->cs_input_local_size_specified = true;
|
||
for (int i = 0; i < 3; i++)
|
||
state->cs_input_local_size[i] = this->local_size[i];
|
||
|
||
/* We may now declare the built-in constant gl_WorkGroupSize (see
|
||
* builtin_variable_generator::generate_constants() for why we didn't
|
||
* declare it earlier).
|
||
*/
|
||
ir_variable *var = new(state->symbols)
|
||
ir_variable(glsl_type::ivec3_type, "gl_WorkGroupSize", ir_var_auto, glsl_precision_undefined);
|
||
var->data.how_declared = ir_var_declared_implicitly;
|
||
var->data.read_only = true;
|
||
instructions->push_tail(var);
|
||
state->symbols->add_variable(var);
|
||
ir_constant_data data;
|
||
memset(&data, 0, sizeof(data));
|
||
for (int i = 0; i < 3; i++)
|
||
data.i[i] = this->local_size[i];
|
||
var->constant_value = new(var) ir_constant(glsl_type::ivec3_type, &data);
|
||
var->constant_initializer =
|
||
new(var) ir_constant(glsl_type::ivec3_type, &data);
|
||
var->data.has_initializer = true;
|
||
|
||
return NULL;
|
||
}
|
||
|
||
|
||
static void
|
||
detect_conflicting_assignments(struct _mesa_glsl_parse_state *state,
|
||
exec_list *instructions)
|
||
{
|
||
bool gl_FragColor_assigned = false;
|
||
bool gl_FragData_assigned = false;
|
||
bool user_defined_fs_output_assigned = false;
|
||
ir_variable *user_defined_fs_output = NULL;
|
||
|
||
/* It would be nice to have proper location information. */
|
||
YYLTYPE loc;
|
||
memset(&loc, 0, sizeof(loc));
|
||
|
||
foreach_in_list(ir_instruction, node, instructions) {
|
||
ir_variable *var = node->as_variable();
|
||
|
||
if (!var || !var->data.assigned)
|
||
continue;
|
||
|
||
if (strcmp(var->name, "gl_FragColor") == 0)
|
||
gl_FragColor_assigned = true;
|
||
else if (strcmp(var->name, "gl_FragData") == 0)
|
||
gl_FragData_assigned = true;
|
||
else if (!is_gl_identifier(var->name)) {
|
||
if (state->stage == MESA_SHADER_FRAGMENT &&
|
||
var->data.mode == ir_var_shader_out) {
|
||
user_defined_fs_output_assigned = true;
|
||
user_defined_fs_output = var;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* From the GLSL 1.30 spec:
|
||
*
|
||
* "If a shader statically assigns a value to gl_FragColor, it
|
||
* may not assign a value to any element of gl_FragData. If a
|
||
* shader statically writes a value to any element of
|
||
* gl_FragData, it may not assign a value to
|
||
* gl_FragColor. That is, a shader may assign values to either
|
||
* gl_FragColor or gl_FragData, but not both. Multiple shaders
|
||
* linked together must also consistently write just one of
|
||
* these variables. Similarly, if user declared output
|
||
* variables are in use (statically assigned to), then the
|
||
* built-in variables gl_FragColor and gl_FragData may not be
|
||
* assigned to. These incorrect usages all generate compile
|
||
* time errors."
|
||
*/
|
||
if (gl_FragColor_assigned && gl_FragData_assigned) {
|
||
_mesa_glsl_error(&loc, state, "fragment shader writes to both "
|
||
"`gl_FragColor' and `gl_FragData'");
|
||
} else if (gl_FragColor_assigned && user_defined_fs_output_assigned) {
|
||
_mesa_glsl_error(&loc, state, "fragment shader writes to both "
|
||
"`gl_FragColor' and `%s'",
|
||
user_defined_fs_output->name);
|
||
} else if (gl_FragData_assigned && user_defined_fs_output_assigned) {
|
||
_mesa_glsl_error(&loc, state, "fragment shader writes to both "
|
||
"`gl_FragData' and `%s'",
|
||
user_defined_fs_output->name);
|
||
}
|
||
}
|
||
|
||
|
||
static void
|
||
remove_per_vertex_blocks(exec_list *instructions,
|
||
_mesa_glsl_parse_state *state, ir_variable_mode mode)
|
||
{
|
||
/* Find the gl_PerVertex interface block of the appropriate (in/out) mode,
|
||
* if it exists in this shader type.
|
||
*/
|
||
const glsl_type *per_vertex = NULL;
|
||
switch (mode) {
|
||
case ir_var_shader_in:
|
||
if (ir_variable *gl_in = state->symbols->get_variable("gl_in"))
|
||
per_vertex = gl_in->get_interface_type();
|
||
break;
|
||
case ir_var_shader_out:
|
||
if (ir_variable *gl_Position =
|
||
state->symbols->get_variable("gl_Position")) {
|
||
per_vertex = gl_Position->get_interface_type();
|
||
}
|
||
break;
|
||
default:
|
||
assert(!"Unexpected mode");
|
||
break;
|
||
}
|
||
|
||
/* If we didn't find a built-in gl_PerVertex interface block, then we don't
|
||
* need to do anything.
|
||
*/
|
||
if (per_vertex == NULL)
|
||
return;
|
||
|
||
/* If the interface block is used by the shader, then we don't need to do
|
||
* anything.
|
||
*/
|
||
interface_block_usage_visitor v(mode, per_vertex);
|
||
v.run(instructions);
|
||
if (v.usage_found())
|
||
return;
|
||
|
||
/* Remove any ir_variable declarations that refer to the interface block
|
||
* we're removing.
|
||
*/
|
||
foreach_in_list_safe(ir_instruction, node, instructions) {
|
||
ir_variable *const var = node->as_variable();
|
||
if (var != NULL && var->get_interface_type() == per_vertex &&
|
||
var->data.mode == mode) {
|
||
state->symbols->disable_variable(var->name);
|
||
var->remove();
|
||
}
|
||
}
|
||
}
|