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//
// Copyright 2018 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.
//
// SeparateArrayConstructorStatements splits statements that are array constructors and drops all of
// their constant arguments. For example, a statement like:
// int[2](0, i++);
// Will be changed to:
// i++;
#include "compiler/translator/tree_ops/d3d/SeparateArrayConstructorStatements.h"
#include "compiler/translator/tree_util/IntermTraverse.h"
namespace sh
{
namespace
{
void SplitConstructorArgs(const TIntermSequence &originalArgs, TIntermSequence *argsOut)
{
for (TIntermNode *arg : originalArgs)
{
TIntermTyped *argTyped = arg->getAsTyped();
if (argTyped->hasSideEffects())
{
TIntermAggregate *argAggregate = argTyped->getAsAggregate();
if (argTyped->isArray() && argAggregate && argAggregate->isConstructor())
{
SplitConstructorArgs(*argAggregate->getSequence(), argsOut);
}
else
{
argsOut->push_back(argTyped);
}
}
}
}
class SeparateArrayConstructorStatementsTraverser : public TIntermTraverser
{
public:
SeparateArrayConstructorStatementsTraverser();
bool visitAggregate(Visit visit, TIntermAggregate *node) override;
};
SeparateArrayConstructorStatementsTraverser::SeparateArrayConstructorStatementsTraverser()
: TIntermTraverser(true, false, false)
{}
bool SeparateArrayConstructorStatementsTraverser::visitAggregate(Visit visit,
TIntermAggregate *node)
{
TIntermBlock *parentAsBlock = getParentNode()->getAsBlock();
if (!parentAsBlock)
{
return false;
}
if (!node->isArray() || !node->isConstructor())
{
return false;
}
TIntermSequence constructorArgs;
SplitConstructorArgs(*node->getSequence(), &constructorArgs);
mMultiReplacements.emplace_back(parentAsBlock, node, std::move(constructorArgs));
return false;
}
} // namespace
bool SeparateArrayConstructorStatements(TCompiler *compiler, TIntermBlock *root)
{
SeparateArrayConstructorStatementsTraverser traverser;
root->traverse(&traverser);
return traverser.updateTree(compiler, root);
}
} // namespace sh
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