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//
// Copyright (c) 2016 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.
//
// IntermNodePatternMatcher is a helper class for matching node trees to given patterns.
// It can be used whenever the same checks for certain node structures are common to multiple AST
// traversers.
//
#include "compiler/translator/IntermNodePatternMatcher.h"
#include "compiler/translator/IntermNode.h"
namespace
{
bool IsNodeBlock(TIntermNode *node)
{
ASSERT(node != nullptr);
return (node->getAsAggregate() && node->getAsAggregate()->getOp() == EOpSequence);
}
} // anonymous namespace
IntermNodePatternMatcher::IntermNodePatternMatcher(const unsigned int mask) : mMask(mask)
{
}
// static
bool IntermNodePatternMatcher::IsDynamicIndexingOfVectorOrMatrix(TIntermBinary *node)
{
return node->getOp() == EOpIndexIndirect && !node->getLeft()->isArray() &&
node->getLeft()->getBasicType() != EbtStruct;
}
bool IntermNodePatternMatcher::matchInternal(TIntermBinary *node, TIntermNode *parentNode)
{
if ((mMask & kExpressionReturningArray) != 0)
{
if (node->isArray() && node->getOp() == EOpAssign && parentNode != nullptr &&
!IsNodeBlock(parentNode))
{
return true;
}
}
if ((mMask & kUnfoldedShortCircuitExpression) != 0)
{
if (node->getRight()->hasSideEffects() &&
(node->getOp() == EOpLogicalOr || node->getOp() == EOpLogicalAnd))
{
return true;
}
}
return false;
}
bool IntermNodePatternMatcher::match(TIntermBinary *node, TIntermNode *parentNode)
{
// L-value tracking information is needed to check for dynamic indexing in L-value.
// Traversers that don't track l-values can still use this class and match binary nodes with
// this variation of this method if they don't need to check for dynamic indexing in l-values.
ASSERT((mMask & kDynamicIndexingOfVectorOrMatrixInLValue) == 0);
return matchInternal(node, parentNode);
}
bool IntermNodePatternMatcher::match(TIntermBinary *node,
TIntermNode *parentNode,
bool isLValueRequiredHere)
{
if (matchInternal(node, parentNode))
{
return true;
}
if ((mMask & kDynamicIndexingOfVectorOrMatrixInLValue) != 0)
{
if (isLValueRequiredHere && IsDynamicIndexingOfVectorOrMatrix(node))
{
return true;
}
}
return false;
}
bool IntermNodePatternMatcher::match(TIntermAggregate *node, TIntermNode *parentNode)
{
if ((mMask & kExpressionReturningArray) != 0)
{
if (parentNode != nullptr)
{
TIntermBinary *parentBinary = parentNode->getAsBinaryNode();
bool parentIsAssignment =
(parentBinary != nullptr &&
(parentBinary->getOp() == EOpAssign || parentBinary->getOp() == EOpInitialize));
if (node->getType().isArray() && !parentIsAssignment &&
(node->isConstructor() || node->getOp() == EOpFunctionCall) &&
!IsNodeBlock(parentNode))
{
return true;
}
}
}
return false;
}
bool IntermNodePatternMatcher::match(TIntermSelection *node)
{
if ((mMask & kUnfoldedShortCircuitExpression) != 0)
{
if (node->usesTernaryOperator())
{
return true;
}
}
return false;
}
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