kc3-lang/angle/src/compiler/translator/RegenerateStructNames.cpp

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• Author : Olli Etuaho
  Date : 2017-07-13 16:07:26
  Hash : a5e693af
  Message : Make unique id counter a member of TSymbolTable This makes unique id counting thread-safe. BUG=angleproject:624 TEST=angle_unittests Change-Id: Ie0f2c7e574470b39750d37d2181c790bc874b275 Reviewed-on: https://chromium-review.googlesource.com/570419 Commit-Queue: Olli Etuaho <oetuaho@nvidia.com> Reviewed-by: Jamie Madill <jmadill@chromium.org>

• src/compiler/translator/RegenerateStructNames.cpp

• //
  // Copyright (c) 2002-2014 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.
  //
  
  #include "common/debug.h"
  #include "compiler/translator/RegenerateStructNames.h"
  
  namespace sh
  {
  
  void RegenerateStructNames::visitSymbol(TIntermSymbol *symbol)
  {
      ASSERT(symbol);
      TType *type = symbol->getTypePointer();
      ASSERT(type);
      TStructure *userType = type->getStruct();
      if (!userType)
          return;
  
      if (mSymbolTable->findBuiltIn(userType->name(), mShaderVersion))
      {
          // Built-in struct, do not touch it.
          return;
      }
  
      int uniqueId = userType->uniqueId();
  
      ASSERT(mScopeDepth > 0);
      if (mScopeDepth == 1)
      {
          // If a struct is defined at global scope, we don't map its name.
          // This is because at global level, the struct might be used to
          // declare a uniform, so the same name needs to stay the same for
          // vertex/fragment shaders. However, our mapping uses internal ID,
          // which will be different for the same struct in vertex/fragment
          // shaders.
          // This is OK because names for any structs defined in other scopes
          // will begin with "_webgl", which is reserved. So there will be
          // no conflicts among unmapped struct names from global scope and
          // mapped struct names from other scopes.
          // However, we need to keep track of these global structs, so if a
          // variable is used in a local scope, we don't try to modify the
          // struct name through that variable.
          mDeclaredGlobalStructs.insert(uniqueId);
          return;
      }
      if (mDeclaredGlobalStructs.count(uniqueId) > 0)
          return;
      // Map {name} to _webgl_struct_{uniqueId}_{name}.
      const char kPrefix[] = "_webgl_struct_";
      if (userType->name().find(kPrefix) == 0)
      {
          // The name has already been regenerated.
          return;
      }
      std::string id = Str(uniqueId);
      TString tmp    = kPrefix + TString(id.c_str());
      tmp += "_" + userType->name();
      userType->setName(tmp);
  }
  
  bool RegenerateStructNames::visitBlock(Visit, TIntermBlock *block)
  {
      ++mScopeDepth;
      TIntermSequence &sequence = *(block->getSequence());
      for (TIntermNode *node : sequence)
      {
          node->traverse(this);
      }
      --mScopeDepth;
      return false;
  }
  
  }  // namespace sh