Line data    Source code

       1             : //
       2             : // Copyright (c) 2002-2015 The ANGLE Project Authors. All rights reserved.
       3             : // Use of this source code is governed by a BSD-style license that can be
       4             : // found in the LICENSE file.
       5             : //
       6             : // The SeparateDeclarations function processes declarations, so that in the end each declaration
       7             : // contains only one declarator.
       8             : // This is useful as an intermediate step when initialization needs to be separated from declaration,
       9             : // or when things need to be unfolded out of the initializer.
      10             : // Example:
      11             : //     int a[1] = int[1](1), b[1] = int[1](2);
      12             : // gets transformed when run through this class into the AST equivalent of:
      13             : //     int a[1] = int[1](1);
      14             : //     int b[1] = int[1](2);
      15             : 
      16             : #include "compiler/translator/SeparateDeclarations.h"
      17             : 
      18             : #include "compiler/translator/IntermNode.h"
      19             : 
      20             : namespace sh
      21             : {
      22             : 
      23             : namespace
      24             : {
      25             : 
      26           0 : class SeparateDeclarationsTraverser : private TIntermTraverser
      27             : {
      28             :   public:
      29             :     static void apply(TIntermNode *root);
      30             :   private:
      31             :     SeparateDeclarationsTraverser();
      32             :     bool visitDeclaration(Visit, TIntermDeclaration *node) override;
      33             : };
      34             : 
      35           0 : void SeparateDeclarationsTraverser::apply(TIntermNode *root)
      36             : {
      37           0 :     SeparateDeclarationsTraverser separateDecl;
      38           0 :     root->traverse(&separateDecl);
      39           0 :     separateDecl.updateTree();
      40           0 : }
      41             : 
      42           0 : SeparateDeclarationsTraverser::SeparateDeclarationsTraverser()
      43           0 :     : TIntermTraverser(true, false, false)
      44             : {
      45           0 : }
      46             : 
      47           0 : bool SeparateDeclarationsTraverser::visitDeclaration(Visit, TIntermDeclaration *node)
      48             : {
      49           0 :     TIntermSequence *sequence = node->getSequence();
      50           0 :     if (sequence->size() > 1)
      51             :     {
      52           0 :         TIntermBlock *parentBlock = getParentNode()->getAsBlock();
      53           0 :         ASSERT(parentBlock != nullptr);
      54             : 
      55           0 :         TIntermSequence replacementDeclarations;
      56           0 :         for (size_t ii = 0; ii < sequence->size(); ++ii)
      57             :         {
      58           0 :             TIntermDeclaration *replacementDeclaration = new TIntermDeclaration();
      59             : 
      60           0 :             replacementDeclaration->appendDeclarator(sequence->at(ii)->getAsTyped());
      61           0 :             replacementDeclaration->setLine(sequence->at(ii)->getLine());
      62           0 :             replacementDeclarations.push_back(replacementDeclaration);
      63             :         }
      64             : 
      65           0 :         mMultiReplacements.push_back(
      66           0 :             NodeReplaceWithMultipleEntry(parentBlock, node, replacementDeclarations));
      67             :     }
      68           0 :     return false;
      69             : }
      70             : 
      71             : } // namespace
      72             : 
      73           0 : void SeparateDeclarations(TIntermNode *root)
      74             : {
      75           0 :     SeparateDeclarationsTraverser::apply(root);
      76           0 : }
      77             : 
      78             : }  // namespace sh