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//
// Copyright 2002 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.
//
// The SeparateDeclarations function processes declarations, so that in the end each declaration
// contains only one declarator.
// This is useful as an intermediate step when initialization needs to be separated from
// declaration, or when things need to be unfolded out of the initializer.
// Example:
// int a[1] = int[1](1), b[1] = int[1](2);
// gets transformed when run through this class into the AST equivalent of:
// int a[1] = int[1](1);
// int b[1] = int[1](2);
#include "compiler/translator/tree_ops/SeparateDeclarations.h"
#include "compiler/translator/SymbolTable.h"
#include "compiler/translator/tree_util/IntermTraverse.h"
#include "compiler/translator/tree_util/ReplaceVariable.h"
namespace sh
{
namespace
{
class SeparateDeclarationsTraverser : private TIntermTraverser
{
public:
[[nodiscard]] static bool apply(TCompiler *compiler,
TIntermNode *root,
TSymbolTable *symbolTable);
private:
SeparateDeclarationsTraverser(TSymbolTable *symbolTable);
bool visitDeclaration(Visit, TIntermDeclaration *node) override;
void visitSymbol(TIntermSymbol *symbol) override;
void separateDeclarator(TIntermSequence *sequence,
size_t index,
TIntermSequence *replacementDeclarations,
const TStructure **replacementStructure);
VariableReplacementMap mVariableMap;
};
bool SeparateDeclarationsTraverser::apply(TCompiler *compiler,
TIntermNode *root,
TSymbolTable *symbolTable)
{
SeparateDeclarationsTraverser separateDecl(symbolTable);
root->traverse(&separateDecl);
return separateDecl.updateTree(compiler, root);
}
SeparateDeclarationsTraverser::SeparateDeclarationsTraverser(TSymbolTable *symbolTable)
: TIntermTraverser(true, false, false, symbolTable)
{}
bool SeparateDeclarationsTraverser::visitDeclaration(Visit, TIntermDeclaration *node)
{
TIntermSequence *sequence = node->getSequence();
if (sequence->size() <= 1)
{
return true;
}
TIntermBlock *parentBlock = getParentNode()->getAsBlock();
ASSERT(parentBlock != nullptr);
TIntermSequence replacementDeclarations;
const TStructure *replacementStructure = nullptr;
for (size_t ii = 0; ii < sequence->size(); ++ii)
{
separateDeclarator(sequence, ii, &replacementDeclarations, &replacementStructure);
}
mMultiReplacements.emplace_back(parentBlock, node, std::move(replacementDeclarations));
return false;
}
void SeparateDeclarationsTraverser::visitSymbol(TIntermSymbol *symbol)
{
const TVariable *variable = &symbol->variable();
if (mVariableMap.count(variable) > 0)
{
queueAccessChainReplacement(mVariableMap[variable]->deepCopy());
}
}
void SeparateDeclarationsTraverser::separateDeclarator(TIntermSequence *sequence,
size_t index,
TIntermSequence *replacementDeclarations,
const TStructure **replacementStructure)
{
TIntermTyped *declarator = sequence->at(index)->getAsTyped();
const TType &declaratorType = declarator->getType();
// If the declaration is not simultaneously declaring a struct, can use the same declarator.
// Otherwise, the first declarator is taken as-is if the struct has a name.
const TStructure *structure = declaratorType.getStruct();
const bool isStructSpecifier = declaratorType.isStructSpecifier();
if (!isStructSpecifier || (index == 0 && structure->symbolType() != SymbolType::Empty))
{
TIntermDeclaration *replacementDeclaration = new TIntermDeclaration;
// Make sure to update the declarator's initializers if any.
declarator->traverse(this);
replacementDeclaration->appendDeclarator(declarator);
replacementDeclaration->setLine(declarator->getLine());
replacementDeclarations->push_back(replacementDeclaration);
return;
}
// If the struct is nameless, split it out first.
if (structure->symbolType() == SymbolType::Empty)
{
if (*replacementStructure == nullptr)
{
TStructure *newStructure =
new TStructure(mSymbolTable, kEmptyImmutableString, &structure->fields(),
SymbolType::AngleInternal);
newStructure->setAtGlobalScope(structure->atGlobalScope());
*replacementStructure = structure = newStructure;
TType *namedType = new TType(structure, true);
namedType->setQualifier(EvqGlobal);
TVariable *structVariable =
new TVariable(mSymbolTable, kEmptyImmutableString, namedType, SymbolType::Empty);
TIntermDeclaration *structDeclaration = new TIntermDeclaration;
structDeclaration->appendDeclarator(new TIntermSymbol(structVariable));
structDeclaration->setLine(declarator->getLine());
replacementDeclarations->push_back(structDeclaration);
}
else
{
structure = *replacementStructure;
}
}
// Redeclare the declarator but not as a struct specifier.
TIntermSymbol *asSymbol = declarator->getAsSymbolNode();
TIntermTyped *initializer = nullptr;
if (asSymbol == nullptr)
{
TIntermBinary *asBinary = declarator->getAsBinaryNode();
ASSERT(asBinary->getOp() == EOpInitialize);
asSymbol = asBinary->getLeft()->getAsSymbolNode();
initializer = asBinary->getRight();
// Make sure the initializer itself has its variables replaced if necessary.
if (initializer->getAsSymbolNode())
{
const TVariable *initializerVariable = &initializer->getAsSymbolNode()->variable();
if (mVariableMap.count(initializerVariable) > 0)
{
initializer = mVariableMap[initializerVariable]->deepCopy();
}
}
else
{
initializer->traverse(this);
}
}
ASSERT(asSymbol && asSymbol->variable().symbolType() != SymbolType::Empty);
TType *newType = new TType(structure, false);
newType->setQualifier(asSymbol->getType().getQualifier());
newType->makeArrays(asSymbol->getType().getArraySizes());
TVariable *replacementVar = new TVariable(mSymbolTable, asSymbol->getName(), newType,
asSymbol->variable().symbolType());
TIntermSymbol *replacementSymbol = new TIntermSymbol(replacementVar);
TIntermTyped *replacement = replacementSymbol;
if (initializer)
{
replacement = new TIntermBinary(EOpInitialize, replacement, initializer);
}
TIntermDeclaration *replacementDeclaration = new TIntermDeclaration;
replacementDeclaration->appendDeclarator(replacement);
replacementDeclaration->setLine(declarator->getLine());
replacementDeclarations->push_back(replacementDeclaration);
mVariableMap[&asSymbol->variable()] = replacementSymbol;
}
} // namespace
bool SeparateDeclarations(TCompiler *compiler, TIntermNode *root, TSymbolTable *symbolTable)
{
return SeparateDeclarationsTraverser::apply(compiler, root, symbolTable);
}
} // namespace sh
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