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//
// Copyright (c) 2017 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.
//
// IntermNode_util.cpp: High-level utilities for creating AST nodes and node hierarchies. Mostly
// meant to be used in AST transforms.
#include "compiler/translator/IntermNode_util.h"
#include "compiler/translator/SymbolTable.h"
namespace sh
{
namespace
{
TName GetInternalFunctionName(const char *name)
{
TString nameStr(name);
TName nameObj(nameStr);
nameObj.setInternal(true);
return nameObj;
}
const TFunction *LookUpBuiltInFunction(const TString &name,
const TIntermSequence *arguments,
const TSymbolTable &symbolTable,
int shaderVersion)
{
TString mangledName = TFunction::GetMangledNameFromCall(name, *arguments);
TSymbol *symbol = symbolTable.findBuiltIn(mangledName, shaderVersion);
if (symbol)
{
ASSERT(symbol->isFunction());
return static_cast<const TFunction *>(symbol);
}
return nullptr;
}
} // anonymous namespace
TIntermFunctionPrototype *CreateInternalFunctionPrototypeNode(const TType &returnType,
const char *name,
const TSymbolUniqueId &functionId)
{
TIntermFunctionPrototype *functionNode = new TIntermFunctionPrototype(returnType, functionId);
functionNode->getFunctionSymbolInfo()->setNameObj(GetInternalFunctionName(name));
return functionNode;
}
TIntermFunctionDefinition *CreateInternalFunctionDefinitionNode(const TType &returnType,
const char *name,
TIntermBlock *functionBody,
const TSymbolUniqueId &functionId)
{
TIntermFunctionPrototype *prototypeNode =
CreateInternalFunctionPrototypeNode(returnType, name, functionId);
return new TIntermFunctionDefinition(prototypeNode, functionBody);
}
TIntermAggregate *CreateInternalFunctionCallNode(const TType &returnType,
const char *name,
const TSymbolUniqueId &functionId,
TIntermSequence *arguments)
{
TIntermAggregate *functionNode = TIntermAggregate::CreateFunctionCall(
returnType, functionId, GetInternalFunctionName(name), arguments);
return functionNode;
}
TIntermTyped *CreateZeroNode(const TType &type)
{
TType constType(type);
constType.setQualifier(EvqConst);
if (!type.isArray() && type.getBasicType() != EbtStruct)
{
size_t size = constType.getObjectSize();
TConstantUnion *u = new TConstantUnion[size];
for (size_t i = 0; i < size; ++i)
{
switch (type.getBasicType())
{
case EbtFloat:
u[i].setFConst(0.0f);
break;
case EbtInt:
u[i].setIConst(0);
break;
case EbtUInt:
u[i].setUConst(0u);
break;
case EbtBool:
u[i].setBConst(false);
break;
default:
// CreateZeroNode is called by ParseContext that keeps parsing even when an
// error occurs, so it is possible for CreateZeroNode to be called with
// non-basic types. This happens only on error condition but CreateZeroNode
// needs to return a value with the correct type to continue the typecheck.
// That's why we handle non-basic type by setting whatever value, we just need
// the type to be right.
u[i].setIConst(42);
break;
}
}
TIntermConstantUnion *node = new TIntermConstantUnion(u, constType);
return node;
}
if (type.getBasicType() == EbtVoid)
{
// Void array. This happens only on error condition, similarly to the case above. We don't
// have a constructor operator for void, so this needs special handling. We'll end up with a
// value without the array type, but that should not be a problem.
while (constType.isArray())
{
constType.toArrayElementType();
}
return CreateZeroNode(constType);
}
TIntermSequence *arguments = new TIntermSequence();
if (type.isArray())
{
TType elementType(type);
elementType.toArrayElementType();
size_t arraySize = type.getOutermostArraySize();
for (size_t i = 0; i < arraySize; ++i)
{
arguments->push_back(CreateZeroNode(elementType));
}
}
else
{
ASSERT(type.getBasicType() == EbtStruct);
const TStructure *structure = type.getStruct();
for (const auto &field : structure->fields())
{
arguments->push_back(CreateZeroNode(*field->type()));
}
}
return TIntermAggregate::CreateConstructor(constType, arguments);
}
TIntermConstantUnion *CreateIndexNode(int index)
{
TConstantUnion *u = new TConstantUnion[1];
u[0].setIConst(index);
TType type(EbtInt, EbpUndefined, EvqConst, 1);
TIntermConstantUnion *node = new TIntermConstantUnion(u, type);
return node;
}
TIntermConstantUnion *CreateBoolNode(bool value)
{
TConstantUnion *u = new TConstantUnion[1];
u[0].setBConst(value);
TType type(EbtBool, EbpUndefined, EvqConst, 1);
TIntermConstantUnion *node = new TIntermConstantUnion(u, type);
return node;
}
TIntermSymbol *CreateTempSymbolNode(const TSymbolUniqueId &id,
const TType &type,
TQualifier qualifier)
{
TInfoSinkBase symbolNameOut;
symbolNameOut << "s" << id.get();
TString symbolName = symbolNameOut.c_str();
TIntermSymbol *node = new TIntermSymbol(id, symbolName, type);
node->setInternal(true);
ASSERT(qualifier == EvqTemporary || qualifier == EvqConst || qualifier == EvqGlobal);
node->getTypePointer()->setQualifier(qualifier);
// TODO(oetuaho): Might be useful to sanitize layout qualifier etc. on the type of the created
// symbol. This might need to be done in other places as well.
return node;
}
TIntermDeclaration *CreateTempInitDeclarationNode(const TSymbolUniqueId &id,
TIntermTyped *initializer,
TQualifier qualifier)
{
ASSERT(initializer != nullptr);
TIntermSymbol *tempSymbol = CreateTempSymbolNode(id, initializer->getType(), qualifier);
TIntermDeclaration *tempDeclaration = new TIntermDeclaration();
TIntermBinary *tempInit = new TIntermBinary(EOpInitialize, tempSymbol, initializer);
tempDeclaration->appendDeclarator(tempInit);
return tempDeclaration;
}
TIntermBlock *EnsureBlock(TIntermNode *node)
{
if (node == nullptr)
return nullptr;
TIntermBlock *blockNode = node->getAsBlock();
if (blockNode != nullptr)
return blockNode;
blockNode = new TIntermBlock();
blockNode->setLine(node->getLine());
blockNode->appendStatement(node);
return blockNode;
}
TIntermSymbol *ReferenceGlobalVariable(const TString &name, const TSymbolTable &symbolTable)
{
TVariable *var = reinterpret_cast<TVariable *>(symbolTable.findGlobal(name));
ASSERT(var);
return new TIntermSymbol(var->getUniqueId(), name, var->getType());
}
TIntermSymbol *ReferenceBuiltInVariable(const TString &name,
const TSymbolTable &symbolTable,
int shaderVersion)
{
const TVariable *var =
reinterpret_cast<const TVariable *>(symbolTable.findBuiltIn(name, shaderVersion, true));
ASSERT(var);
return new TIntermSymbol(var->getUniqueId(), name, var->getType());
}
TIntermTyped *CreateBuiltInFunctionCallNode(const TString &name,
TIntermSequence *arguments,
const TSymbolTable &symbolTable,
int shaderVersion)
{
const TFunction *fn = LookUpBuiltInFunction(name, arguments, symbolTable, shaderVersion);
ASSERT(fn);
TOperator op = fn->getBuiltInOp();
if (op != EOpNull)
{
if (arguments->size() == 1)
{
return new TIntermUnary(op, arguments->at(0)->getAsTyped());
}
return TIntermAggregate::Create(fn->getReturnType(), op, arguments);
}
return TIntermAggregate::CreateBuiltInFunctionCall(*fn, arguments);
}
} // namespace sh
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