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

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• Hash : 60015ff6
  Author :
  Date : 2021-01-14T02:03:07
  

  Vulkan: Redo RewriteStructSamplers
  
  This transformation is split into two.  The first transformation solely
  takes out the samplers out of structs, and potentially generates array
  of array of samplers.  A second transformation is added that takes any
  array of array of opaque uniforms and flattens it.
  
  A follow up change will simplify RewriteAtomicCounters which also
  handles array of arrays (which is no longer possible), and removes
  dependency on shaderStorageBufferArrayDynamicIndexing.
  
  Bug: angleproject:2703
  Bug: angleproject:3881
  Bug: angleproject:4071
  Bug: angleproject:4211
  Change-Id: I352bb2bbe65ac49f4d7d753c0ba3160fa3cc925a
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2628138
  Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
  Reviewed-by: Tim Van Patten <timvp@google.com>
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  

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

• //
  // Copyright 2017 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.
  //
  // RemoveArrayLengthMethod.cpp:
  //   Fold array length expressions, including cases where the "this" node has side effects.
  //   Example:
  //     int i = (a = b).length();
  //     int j = (func()).length();
  //   becomes:
  //     (a = b);
  //     int i = <constant array length>;
  //     func();
  //     int j = <constant array length>;
  //
  //   Must be run after SplitSequenceOperator, SimplifyLoopConditions and SeparateDeclarations steps
  //   have been done to expressions containing calls of the array length method.
  //
  //   Does nothing to length method calls done on runtime-sized arrays.
  
  #include "compiler/translator/tree_ops/RemoveArrayLengthMethod.h"
  
  #include "compiler/translator/IntermNode.h"
  #include "compiler/translator/tree_util/IntermTraverse.h"
  
  namespace sh
  {
  
  namespace
  {
  
  class RemoveArrayLengthTraverser : public TIntermTraverser
  {
    public:
      RemoveArrayLengthTraverser() : TIntermTraverser(true, false, false), mFoundArrayLength(false) {}
  
      bool visitUnary(Visit visit, TIntermUnary *node) override;
  
      void nextIteration() { mFoundArrayLength = false; }
  
      bool foundArrayLength() const { return mFoundArrayLength; }
  
    private:
      void insertSideEffectsInParentBlock(TIntermTyped *node);
  
      bool mFoundArrayLength;
  };
  
  bool RemoveArrayLengthTraverser::visitUnary(Visit visit, TIntermUnary *node)
  {
      // The only case where we leave array length() in place is for runtime-sized arrays.
      if (node->getOp() == EOpArrayLength && !node->getOperand()->getType().isUnsizedArray())
      {
          mFoundArrayLength = true;
          insertSideEffectsInParentBlock(node->getOperand());
          TConstantUnion *constArray = new TConstantUnion[1];
          constArray->setIConst(node->getOperand()->getOutermostArraySize());
          queueReplacement(new TIntermConstantUnion(constArray, node->getType()),
                           OriginalNode::IS_DROPPED);
          return false;
      }
      return true;
  }
  
  void RemoveArrayLengthTraverser::insertSideEffectsInParentBlock(TIntermTyped *node)
  {
      // If the node is an index type, traverse it and add the indices as side effects.  If at the end
      // an expression without side effect is encountered, such as an opaque uniform or a lone symbol,
      // don't generate a statement for it.
      if (!node->hasSideEffects())
      {
          return;
      }
  
      TIntermBinary *asBinary = node->getAsBinaryNode();
      if (asBinary && !asBinary->isAssignment())
      {
          insertSideEffectsInParentBlock(asBinary->getLeft());
          insertSideEffectsInParentBlock(asBinary->getRight());
      }
      else
      {
          insertStatementInParentBlock(node);
      }
  }
  
  }  // anonymous namespace
  
  bool RemoveArrayLengthMethod(TCompiler *compiler, TIntermBlock *root)
  {
      RemoveArrayLengthTraverser traverser;
      do
      {
          traverser.nextIteration();
          root->traverse(&traverser);
          if (traverser.foundArrayLength())
          {
              if (!traverser.updateTree(compiler, root))
              {
                  return false;
              }
          }
      } while (traverser.foundArrayLength());
  
      return true;
  }
  
  }  // namespace sh
  

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