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//
// Copyright (c) 2002-2013 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.
//
#include "compiler/translator/UnfoldShortCircuitAST.h"
namespace sh
{
namespace
{
// "x || y" is equivalent to "x ? true : y".
TIntermTernary *UnfoldOR(TIntermTyped *x, TIntermTyped *y)
{
TConstantUnion *u = new TConstantUnion;
u->setBConst(true);
TIntermConstantUnion *trueNode = new TIntermConstantUnion(
u, TType(EbtBool, EbpUndefined, EvqConst, 1));
return new TIntermTernary(x, trueNode, y);
}
// "x && y" is equivalent to "x ? y : false".
TIntermTernary *UnfoldAND(TIntermTyped *x, TIntermTyped *y)
{
TConstantUnion *u = new TConstantUnion;
u->setBConst(false);
TIntermConstantUnion *falseNode = new TIntermConstantUnion(
u, TType(EbtBool, EbpUndefined, EvqConst, 1));
return new TIntermTernary(x, y, falseNode);
}
} // namespace anonymous
bool UnfoldShortCircuitAST::visitBinary(Visit visit, TIntermBinary *node)
{
TIntermTernary *replacement = nullptr;
switch (node->getOp())
{
case EOpLogicalOr:
replacement = UnfoldOR(node->getLeft(), node->getRight());
break;
case EOpLogicalAnd:
replacement = UnfoldAND(node->getLeft(), node->getRight());
break;
default:
break;
}
if (replacement)
{
queueReplacement(node, replacement, OriginalNode::IS_DROPPED);
}
return true;
}
} // namespace sh
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