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// Copyright 2016 The SwiftShader Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "intermediate.h"
//
// Traverse the intermediate representation tree, and
// call a node type specific function for each node.
// Done recursively through the member function Traverse().
// Node types can be skipped if their function to call is 0,
// but their subtree will still be traversed.
// Nodes with children can have their whole subtree skipped
// if preVisit is turned on and the type specific function
// returns false.
//
// preVisit, postVisit, and rightToLeft control what order
// nodes are visited in.
//
//
// Traversal functions for terminals are straighforward....
//
void TIntermSymbol::traverse(TIntermTraverser* it)
{
it->visitSymbol(this);
}
void TIntermConstantUnion::traverse(TIntermTraverser* it)
{
it->visitConstantUnion(this);
}
//
// Traverse a binary node.
//
void TIntermBinary::traverse(TIntermTraverser* it)
{
bool visit = true;
//
// visit the node before children if pre-visiting.
//
if(it->preVisit)
{
visit = it->visitBinary(PreVisit, this);
}
//
// Visit the children, in the right order.
//
if(visit)
{
it->incrementDepth(this);
if(it->rightToLeft)
{
if(right)
{
right->traverse(it);
}
if(it->inVisit)
{
visit = it->visitBinary(InVisit, this);
}
if(visit && left)
{
left->traverse(it);
}
}
else
{
if(left)
{
left->traverse(it);
}
if(it->inVisit)
{
visit = it->visitBinary(InVisit, this);
}
if(visit && right)
{
right->traverse(it);
}
}
it->decrementDepth();
}
//
// Visit the node after the children, if requested and the traversal
// hasn't been cancelled yet.
//
if(visit && it->postVisit)
{
it->visitBinary(PostVisit, this);
}
}
//
// Traverse a unary node. Same comments in binary node apply here.
//
void TIntermUnary::traverse(TIntermTraverser* it)
{
bool visit = true;
if (it->preVisit)
visit = it->visitUnary(PreVisit, this);
if (visit) {
it->incrementDepth(this);
operand->traverse(it);
it->decrementDepth();
}
if (visit && it->postVisit)
it->visitUnary(PostVisit, this);
}
//
// Traverse an aggregate node. Same comments in binary node apply here.
//
void TIntermAggregate::traverse(TIntermTraverser* it)
{
bool visit = true;
if(it->preVisit)
{
visit = it->visitAggregate(PreVisit, this);
}
if(visit)
{
it->incrementDepth(this);
if(it->rightToLeft)
{
for(TIntermSequence::reverse_iterator sit = sequence.rbegin(); sit != sequence.rend(); sit++)
{
(*sit)->traverse(it);
if(visit && it->inVisit)
{
if(*sit != sequence.front())
{
visit = it->visitAggregate(InVisit, this);
}
}
}
}
else
{
for(TIntermSequence::iterator sit = sequence.begin(); sit != sequence.end(); sit++)
{
(*sit)->traverse(it);
if(visit && it->inVisit)
{
if(*sit != sequence.back())
{
visit = it->visitAggregate(InVisit, this);
}
}
}
}
it->decrementDepth();
}
if(visit && it->postVisit)
{
it->visitAggregate(PostVisit, this);
}
}
//
// Traverse a selection node. Same comments in binary node apply here.
//
void TIntermSelection::traverse(TIntermTraverser* it)
{
bool visit = true;
if (it->preVisit)
visit = it->visitSelection(PreVisit, this);
if (visit) {
it->incrementDepth(this);
if (it->rightToLeft) {
if (falseBlock)
falseBlock->traverse(it);
if (trueBlock)
trueBlock->traverse(it);
condition->traverse(it);
} else {
condition->traverse(it);
if (trueBlock)
trueBlock->traverse(it);
if (falseBlock)
falseBlock->traverse(it);
}
it->decrementDepth();
}
if (visit && it->postVisit)
it->visitSelection(PostVisit, this);
}
//
// Traverse a switch node. Same comments in binary node apply here.
//
void TIntermSwitch::traverse(TIntermTraverser *it)
{
bool visit = true;
if(it->preVisit)
visit = it->visitSwitch(PreVisit, this);
if(visit)
{
it->incrementDepth(this);
if(it->inVisit)
visit = it->visitSwitch(InVisit, this);
it->decrementDepth();
}
if(visit && it->postVisit)
it->visitSwitch(PostVisit, this);
}
//
// Traverse a switch node. Same comments in binary node apply here.
//
void TIntermCase::traverse(TIntermTraverser *it)
{
bool visit = true;
if(it->preVisit)
visit = it->visitCase(PreVisit, this);
if(visit && mCondition)
mCondition->traverse(it);
if(visit && it->postVisit)
it->visitCase(PostVisit, this);
}
//
// Traverse a loop node. Same comments in binary node apply here.
//
void TIntermLoop::traverse(TIntermTraverser* it)
{
bool visit = true;
if(it->preVisit)
{
visit = it->visitLoop(PreVisit, this);
}
if(visit)
{
it->incrementDepth(this);
if(it->rightToLeft)
{
if(expr)
{
expr->traverse(it);
}
if(body)
{
body->traverse(it);
}
if(cond)
{
cond->traverse(it);
}
}
else
{
if(cond)
{
cond->traverse(it);
}
if(body)
{
body->traverse(it);
}
if(expr)
{
expr->traverse(it);
}
}
it->decrementDepth();
}
if(visit && it->postVisit)
{
it->visitLoop(PostVisit, this);
}
}
//
// Traverse a branch node. Same comments in binary node apply here.
//
void TIntermBranch::traverse(TIntermTraverser* it)
{
bool visit = true;
if (it->preVisit)
visit = it->visitBranch(PreVisit, this);
if (visit && expression) {
it->incrementDepth(this);
expression->traverse(it);
it->decrementDepth();
}
if (visit && it->postVisit)
it->visitBranch(PostVisit, this);
}