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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 SeparateArrayDeclarations function processes declarations that contain array declarators. Each declarator in
// such declarations gets its own declaration.
// This is useful as an intermediate step when initialization needs to be separated from declaration.
// 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/IntermNode.h"
namespace
{
class SeparateDeclarations : private TIntermTraverser
{
public:
static void apply(TIntermNode *root);
private:
SeparateDeclarations();
bool visitAggregate(Visit, TIntermAggregate *node) override;
};
void SeparateDeclarations::apply(TIntermNode *root)
{
SeparateDeclarations separateDecl;
root->traverse(&separateDecl);
separateDecl.updateTree();
}
SeparateDeclarations::SeparateDeclarations()
: TIntermTraverser(true, false, false)
{
}
bool SeparateDeclarations::visitAggregate(Visit, TIntermAggregate *node)
{
if (node->getOp() == EOpDeclaration)
{
TIntermSequence *sequence = node->getSequence();
bool sequenceContainsArrays = false;
for (size_t ii = 0; ii < sequence->size(); ++ii)
{
TIntermTyped *typed = sequence->at(ii)->getAsTyped();
if (typed != nullptr && typed->isArray())
{
sequenceContainsArrays = true;
break;
}
}
if (sequence->size() > 1 && sequenceContainsArrays)
{
TIntermAggregate *parentAgg = getParentNode()->getAsAggregate();
ASSERT(parentAgg != nullptr);
TIntermSequence replacementDeclarations;
for (size_t ii = 0; ii < sequence->size(); ++ii)
{
TIntermAggregate *replacementDeclaration = new TIntermAggregate;
replacementDeclaration->setOp(EOpDeclaration);
replacementDeclaration->getSequence()->push_back(sequence->at(ii));
replacementDeclaration->setLine(sequence->at(ii)->getLine());
replacementDeclarations.push_back(replacementDeclaration);
}
mMultiReplacements.push_back(NodeReplaceWithMultipleEntry(parentAgg, node, replacementDeclarations));
}
return false;
}
return true;
}
} // namespace
void SeparateArrayDeclarations(TIntermNode *root)
{
SeparateDeclarations::apply(root);
}
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