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//
// Copyright (c) 2012 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/depgraph/DependencyGraphBuilder.h"
void TDependencyGraphBuilder::build(TIntermNode *node, TDependencyGraph *graph)
{
TDependencyGraphBuilder builder(graph);
builder.build(node);
}
bool TDependencyGraphBuilder::visitAggregate(
Visit visit, TIntermAggregate *intermAggregate)
{
switch (intermAggregate->getOp())
{
case EOpFunction:
visitFunctionDefinition(intermAggregate);
break;
case EOpFunctionCall:
visitFunctionCall(intermAggregate);
break;
default:
visitAggregateChildren(intermAggregate);
break;
}
return false;
}
void TDependencyGraphBuilder::visitFunctionDefinition(
TIntermAggregate *intermAggregate)
{
// Currently, we do not support user defined functions.
if (intermAggregate->getName() != "main(")
return;
visitAggregateChildren(intermAggregate);
}
// Takes an expression like "f(x)" and creates a dependency graph like
// "x -> argument 0 -> function call".
void TDependencyGraphBuilder::visitFunctionCall(
TIntermAggregate *intermFunctionCall)
{
TGraphFunctionCall *functionCall =
mGraph->createFunctionCall(intermFunctionCall);
// Run through the function call arguments.
int argumentNumber = 0;
TIntermSequence *intermArguments = intermFunctionCall->getSequence();
for (TIntermSequence::const_iterator iter = intermArguments->begin();
iter != intermArguments->end();
++iter, ++argumentNumber)
{
TNodeSetMaintainer nodeSetMaintainer(this);
TIntermNode *intermArgument = *iter;
intermArgument->traverse(this);
if (TParentNodeSet *argumentNodes = mNodeSets.getTopSet())
{
TGraphArgument *argument = mGraph->createArgument(
intermFunctionCall, argumentNumber);
connectMultipleNodesToSingleNode(argumentNodes, argument);
argument->addDependentNode(functionCall);
}
}
// Push the leftmost symbol of this function call into the current set of
// dependent symbols to represent the result of this function call.
// Thus, an expression like "y = f(x)" will yield a dependency graph like
// "x -> argument 0 -> function call -> y".
// This line essentially passes the function call node back up to an earlier
// visitAssignment call, which will create the connection "function call -> y".
mNodeSets.insertIntoTopSet(functionCall);
}
void TDependencyGraphBuilder::visitAggregateChildren(
TIntermAggregate *intermAggregate)
{
TIntermSequence *sequence = intermAggregate->getSequence();
for (TIntermSequence::const_iterator iter = sequence->begin();
iter != sequence->end(); ++iter)
{
TIntermNode *intermChild = *iter;
intermChild->traverse(this);
}
}
void TDependencyGraphBuilder::visitSymbol(TIntermSymbol *intermSymbol)
{
// Push this symbol into the set of dependent symbols for the current
// assignment or condition that we are traversing.
TGraphSymbol *symbol = mGraph->getOrCreateSymbol(intermSymbol);
mNodeSets.insertIntoTopSet(symbol);
// If this symbol is the current leftmost symbol under an assignment, replace
// the previous leftmost symbol with this symbol.
if (!mLeftmostSymbols.empty() && mLeftmostSymbols.top() != &mRightSubtree)
{
mLeftmostSymbols.pop();
mLeftmostSymbols.push(symbol);
}
}
bool TDependencyGraphBuilder::visitBinary(Visit visit, TIntermBinary *intermBinary)
{
TOperator op = intermBinary->getOp();
if (op == EOpInitialize || intermBinary->isAssignment())
visitAssignment(intermBinary);
else if (op == EOpLogicalAnd || op == EOpLogicalOr)
visitLogicalOp(intermBinary);
else
visitBinaryChildren(intermBinary);
return false;
}
void TDependencyGraphBuilder::visitAssignment(TIntermBinary *intermAssignment)
{
TIntermTyped *intermLeft = intermAssignment->getLeft();
if (!intermLeft)
return;
TGraphSymbol *leftmostSymbol = NULL;
{
TNodeSetMaintainer nodeSetMaintainer(this);
{
TLeftmostSymbolMaintainer leftmostSymbolMaintainer(this, mLeftSubtree);
intermLeft->traverse(this);
leftmostSymbol = mLeftmostSymbols.top();
// After traversing the left subtree of this assignment, we should
// have found a real leftmost symbol, and the leftmost symbol should
// not be a placeholder.
ASSERT(leftmostSymbol != &mLeftSubtree);
ASSERT(leftmostSymbol != &mRightSubtree);
}
if (TIntermTyped *intermRight = intermAssignment->getRight())
{
TLeftmostSymbolMaintainer leftmostSymbolMaintainer(this, mRightSubtree);
intermRight->traverse(this);
}
if (TParentNodeSet *assignmentNodes = mNodeSets.getTopSet())
connectMultipleNodesToSingleNode(assignmentNodes, leftmostSymbol);
}
// Push the leftmost symbol of this assignment into the current set of dependent
// symbols to represent the result of this assignment.
// An expression like "a = (b = c)" will yield a dependency graph like
// "c -> b -> a".
// This line essentially passes the leftmost symbol of the nested assignment
// ("b" in this example) back up to the earlier visitAssignment call for the
// outer assignment, which will create the connection "b -> a".
mNodeSets.insertIntoTopSet(leftmostSymbol);
}
void TDependencyGraphBuilder::visitLogicalOp(TIntermBinary *intermLogicalOp)
{
if (TIntermTyped *intermLeft = intermLogicalOp->getLeft())
{
TNodeSetPropagatingMaintainer nodeSetMaintainer(this);
intermLeft->traverse(this);
if (TParentNodeSet *leftNodes = mNodeSets.getTopSet())
{
TGraphLogicalOp *logicalOp = mGraph->createLogicalOp(intermLogicalOp);
connectMultipleNodesToSingleNode(leftNodes, logicalOp);
}
}
if (TIntermTyped *intermRight = intermLogicalOp->getRight())
{
TLeftmostSymbolMaintainer leftmostSymbolMaintainer(this, mRightSubtree);
intermRight->traverse(this);
}
}
void TDependencyGraphBuilder::visitBinaryChildren(TIntermBinary *intermBinary)
{
if (TIntermTyped *intermLeft = intermBinary->getLeft())
intermLeft->traverse(this);
if (TIntermTyped *intermRight = intermBinary->getRight())
{
TLeftmostSymbolMaintainer leftmostSymbolMaintainer(this, mRightSubtree);
intermRight->traverse(this);
}
}
bool TDependencyGraphBuilder::visitSelection(
Visit visit, TIntermSelection *intermSelection)
{
if (TIntermNode *intermCondition = intermSelection->getCondition())
{
TNodeSetMaintainer nodeSetMaintainer(this);
intermCondition->traverse(this);
if (TParentNodeSet *conditionNodes = mNodeSets.getTopSet())
{
TGraphSelection *selection = mGraph->createSelection(intermSelection);
connectMultipleNodesToSingleNode(conditionNodes, selection);
}
}
if (TIntermNode *intermTrueBlock = intermSelection->getTrueBlock())
intermTrueBlock->traverse(this);
if (TIntermNode *intermFalseBlock = intermSelection->getFalseBlock())
intermFalseBlock->traverse(this);
return false;
}
bool TDependencyGraphBuilder::visitLoop(Visit visit, TIntermLoop *intermLoop)
{
if (TIntermTyped *intermCondition = intermLoop->getCondition())
{
TNodeSetMaintainer nodeSetMaintainer(this);
intermCondition->traverse(this);
if (TParentNodeSet *conditionNodes = mNodeSets.getTopSet())
{
TGraphLoop *loop = mGraph->createLoop(intermLoop);
connectMultipleNodesToSingleNode(conditionNodes, loop);
}
}
if (TIntermNode* intermBody = intermLoop->getBody())
intermBody->traverse(this);
if (TIntermTyped *intermExpression = intermLoop->getExpression())
intermExpression->traverse(this);
return false;
}
void TDependencyGraphBuilder::connectMultipleNodesToSingleNode(
TParentNodeSet *nodes, TGraphNode *node) const
{
for (TParentNodeSet::const_iterator iter = nodes->begin();
iter != nodes->end(); ++iter)
{
TGraphParentNode *currentNode = *iter;
currentNode->addDependentNode(node);
}
}
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