kc3-lang/angle/src/compiler/translator/tree_ops/InitializeVariables.h

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• Hash : 65513240
  Author :
  Date : 2025-01-03T17:26:55
  

  Fix initializing output variables
  
  ... by compiling a list of TVariables instead of names that are later
  looked up.  The latter results in wrong symbols being initialized when
  the output variables are shadowed.
  
  Bug: chromium:376738756
  Bug: chromium:377553431
  Change-Id: I76b9688c035476c547ac73cff380629161210406
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/6143374
  Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
  Reviewed-by: Geoff Lang <geofflang@chromium.org>
  

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• src/compiler/translator/tree_ops/InitializeVariables.h

• //
  // Copyright 2002 The ANGLE Project Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  //
  
  #ifndef COMPILER_TRANSLATOR_TREEOPS_INITIALIZEVARIABLES_H_
  #define COMPILER_TRANSLATOR_TREEOPS_INITIALIZEVARIABLES_H_
  
  #include <GLSLANG/ShaderLang.h>
  
  #include "compiler/translator/ExtensionBehavior.h"
  #include "compiler/translator/IntermNode.h"
  
  namespace sh
  {
  class TCompiler;
  class TSymbolTable;
  
  typedef std::vector<const TVariable *> InitVariableList;
  
  // For all of the functions below: If canUseLoopsToInitialize is set, for loops are used instead of
  // a large number of initializers where it can make sense, such as for initializing large arrays.
  
  // Populate a sequence of assignment operations to initialize "initializedSymbol". initializedSymbol
  // may be an array, struct or any combination of these, as long as it contains only basic types.
  void CreateInitCode(const TIntermTyped *initializedSymbol,
                      bool canUseLoopsToInitialize,
                      bool highPrecisionSupported,
                      TIntermSequence *initCode,
                      TSymbolTable *symbolTable);
  
  // Initialize all uninitialized local variables, so that undefined behavior is avoided.
  [[nodiscard]] bool InitializeUninitializedLocals(TCompiler *compiler,
                                                   TIntermBlock *root,
                                                   int shaderVersion,
                                                   bool canUseLoopsToInitialize,
                                                   bool highPrecisionSupported,
                                                   TSymbolTable *symbolTable);
  
  // This function can initialize all the types that CreateInitCode is able to initialize. All
  // variables must be globals which can be found in the symbol table. For now it is used for the
  // following two scenarios:
  //   1. Initializing gl_Position;
  //   2. Initializing output variables referred to in the shader source.
  // Note: The type of each lvalue in an initializer is retrieved from the symbol table. gl_FragData
  // requires special handling because the number of indices which can be initialized is determined by
  // enabled extensions.
  [[nodiscard]] bool InitializeVariables(TCompiler *compiler,
                                         TIntermBlock *root,
                                         const InitVariableList &vars,
                                         TSymbolTable *symbolTable,
                                         int shaderVersion,
                                         const TExtensionBehavior &extensionBehavior,
                                         bool canUseLoopsToInitialize,
                                         bool highPrecisionSupported);
  
  }  // namespace sh
  
  #endif  // COMPILER_TRANSLATOR_TREEOPS_INITIALIZEVARIABLES_H_
  

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