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//
// Copyright (c) 2002-2015 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.
//
// The SeparateDeclarations function processes declarations, so that in the end each declaration
// contains only one declarator.
// This is useful as an intermediate step when initialization needs to be separated from
// declaration, or when things need to be unfolded out of the initializer.
// Example:
// int a[1] = int[1](1), b[1] = int[1](2);
// gets transformed when run through this class into the AST equivalent of:
// int a[1] = int[1](1);
// int b[1] = int[1](2);
#include "compiler/translator/SeparateDeclarations.h"
#include "compiler/translator/IntermTraverse.h"
namespace sh
{
namespace
{
class SeparateDeclarationsTraverser : private TIntermTraverser
{
public:
static void apply(TIntermNode *root);
private:
SeparateDeclarationsTraverser();
bool visitDeclaration(Visit, TIntermDeclaration *node) override;
};
void SeparateDeclarationsTraverser::apply(TIntermNode *root)
{
SeparateDeclarationsTraverser separateDecl;
root->traverse(&separateDecl);
separateDecl.updateTree();
}
SeparateDeclarationsTraverser::SeparateDeclarationsTraverser()
: TIntermTraverser(true, false, false)
{
}
bool SeparateDeclarationsTraverser::visitDeclaration(Visit, TIntermDeclaration *node)
{
TIntermSequence *sequence = node->getSequence();
if (sequence->size() > 1)
{
TIntermBlock *parentBlock = getParentNode()->getAsBlock();
ASSERT(parentBlock != nullptr);
TIntermSequence replacementDeclarations;
for (size_t ii = 0; ii < sequence->size(); ++ii)
{
TIntermDeclaration *replacementDeclaration = new TIntermDeclaration();
replacementDeclaration->appendDeclarator(sequence->at(ii)->getAsTyped());
replacementDeclaration->setLine(sequence->at(ii)->getLine());
replacementDeclarations.push_back(replacementDeclaration);
}
mMultiReplacements.push_back(
NodeReplaceWithMultipleEntry(parentBlock, node, replacementDeclarations));
}
return false;
}
} // namespace
void SeparateDeclarations(TIntermNode *root)
{
SeparateDeclarationsTraverser::apply(root);
}
} // namespace sh
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