kc3-lang/angle/src/compiler/translator/tree_ops/RemoveAtomicCounterBuiltins.cpp

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• Hash : 8b869a95
  Author :
  Date : 2021-06-13T01:09:27
  

  Translator: Generate Ops for all built-in functions
  
  EOpCallBuiltInFunction is removed in this change, as well as the
  "op": "auto" property in builtin_function_declarations.txt.  Instead,
  gen_builtin_symbols.py automatically generates Ops for every built-in
  function and generates the TOperator enum accordingly.
  
  This simplifies SPIR-V code generation by allowing switches to be used
  on operators instead of string comparisons.
  
  Bug: angleproject:4589
  Bug: angleproject:4889
  Change-Id: Ia351524400b0e12a10a5572e27e9b88c6ec2e61c
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2958869
  Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
  Reviewed-by: Jonah Ryan-Davis <jonahr@google.com>
  Reviewed-by: Tim Van Patten <timvp@google.com>
  

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• src/compiler/translator/tree_ops/RemoveAtomicCounterBuiltins.cpp

• //
  // Copyright 2020 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.
  //
  // RemoveAtomicCounterBuiltins: Remove atomic counter builtins.
  //
  
  #include "compiler/translator/tree_ops/RemoveAtomicCounterBuiltins.h"
  
  #include "compiler/translator/Compiler.h"
  #include "compiler/translator/tree_util/IntermTraverse.h"
  
  namespace sh
  {
  namespace
  {
  
  bool IsAtomicCounterDecl(const TIntermDeclaration *node)
  {
      const TIntermSequence &sequence = *(node->getSequence());
      TIntermTyped *variable          = sequence.front()->getAsTyped();
      const TType &type               = variable->getType();
      return type.getQualifier() == EvqUniform && type.isAtomicCounter();
  }
  
  // Traverser that removes all GLSL built-ins that use AtomicCounters
  // Only called when the builtins are in use, but no atomic counters have been declared
  class RemoveAtomicCounterBuiltinsTraverser : public TIntermTraverser
  {
    public:
      RemoveAtomicCounterBuiltinsTraverser() : TIntermTraverser(true, false, false) {}
  
      bool visitDeclaration(Visit visit, TIntermDeclaration *node) override
      {
          ASSERT(visit == PreVisit);
  
          // Active atomic counters should have been removed by RewriteAtomicCounters, and this
          // traversal should not have been invoked
          ASSERT(!IsAtomicCounterDecl(node));
          return false;
      }
  
      bool visitAggregate(Visit visit, TIntermAggregate *node) override
      {
          if (node->getOp() == EOpMemoryBarrierAtomicCounter)
          {
              // Vulkan does not support atomic counters, so if this builtin finds its way here,
              // we need to remove it.
              TIntermSequence emptySequence;
              mMultiReplacements.emplace_back(getParentNode()->getAsBlock(), node,
                                              std::move(emptySequence));
              return true;
          }
  
          // We shouldn't see any other builtins because they cannot be present without an active
          // atomic counter, and should have been removed by RewriteAtomicCounters. If this fires,
          // this traversal should not have been called.
          ASSERT(!(BuiltInGroup::IsBuiltIn(node->getOp()) &&
                   node->getFunction()->isAtomicCounterFunction()));
  
          return false;
      }
  };
  
  }  // anonymous namespace
  
  bool RemoveAtomicCounterBuiltins(TCompiler *compiler, TIntermBlock *root)
  {
      RemoveAtomicCounterBuiltinsTraverser traverser;
      root->traverse(&traverser);
      return traverser.updateTree(compiler, root);
  }
  }  // namespace sh
  

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