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//
// Copyright 2018 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.
//
// FunctionLookup.cpp: Used for storing function calls that have not yet been resolved during
// parsing.
//
#include "compiler/translator/FunctionLookup.h"
#include "compiler/translator/ImmutableStringBuilder.h"
namespace sh
{
namespace
{
const char kFunctionMangledNameSeparator = '(';
constexpr const ImmutableString kEmptyName("");
// Helper function for GetMangledNames
// Gets all ordered combinations of elements in list[currentIndex, end]
std::vector<std::vector<int>> GetImplicitConversionCombinations(const std::vector<int> &list)
{
std::vector<std::vector<int>> target;
target.push_back(std::vector<int>());
for (size_t currentIndex = 0; currentIndex < list.size(); currentIndex++)
{
size_t prevIterSize = target.size();
for (size_t copyIndex = 0; copyIndex < prevIterSize; copyIndex++)
{
std::vector<int> combination = target[copyIndex];
combination.push_back(list[currentIndex]);
target.push_back(combination);
}
}
return target;
}
} // anonymous namespace
TFunctionLookup::TFunctionLookup(const ImmutableString &name,
const TType *constructorType,
const TSymbol *symbol)
: mName(name), mConstructorType(constructorType), mThisNode(nullptr), mSymbol(symbol)
{}
// static
TFunctionLookup *TFunctionLookup::CreateConstructor(const TType *type)
{
ASSERT(type != nullptr);
return new TFunctionLookup(kEmptyName, type, nullptr);
}
// static
TFunctionLookup *TFunctionLookup::CreateFunctionCall(const ImmutableString &name,
const TSymbol *symbol)
{
ASSERT(name != "");
return new TFunctionLookup(name, nullptr, symbol);
}
const ImmutableString &TFunctionLookup::name() const
{
return mName;
}
ImmutableString TFunctionLookup::getMangledName() const
{
return GetMangledName(mName.data(), mArguments);
}
ImmutableString TFunctionLookup::GetMangledName(const char *functionName,
const TIntermSequence &arguments)
{
std::string newName(functionName);
newName += kFunctionMangledNameSeparator;
for (TIntermNode *argument : arguments)
{
newName += argument->getAsTyped()->getType().getMangledName();
}
return ImmutableString(newName);
}
std::vector<ImmutableString> GetMangledNames(const char *functionName,
const TIntermSequence &arguments)
{
std::vector<ImmutableString> target;
std::vector<int> indexes;
for (int i = 0; i < static_cast<int>(arguments.size()); i++)
{
TIntermNode *argument = arguments[i];
TBasicType argType = argument->getAsTyped()->getType().getBasicType();
if (argType == EbtInt || argType == EbtUInt)
{
indexes.push_back(i);
}
}
std::vector<std::vector<int>> combinations = GetImplicitConversionCombinations(indexes);
for (const std::vector<int> &combination : combinations)
{
// combination: ordered list of indexes for arguments that should be converted to float
std::string newName(functionName);
newName += kFunctionMangledNameSeparator;
// combination[currentIndex] represents index of next argument to be converted
int currentIndex = 0;
for (int i = 0; i < (int)arguments.size(); i++)
{
TIntermNode *argument = arguments[i];
if (currentIndex != static_cast<int>(combination.size()) &&
combination[currentIndex] == i)
{
// Convert
TType type = argument->getAsTyped()->getType();
type.setBasicType(EbtFloat);
newName += type.getMangledName();
currentIndex++;
}
else
{
// Don't convert
newName += argument->getAsTyped()->getType().getMangledName();
}
}
target.push_back(ImmutableString(newName));
}
return target;
}
std::vector<ImmutableString> TFunctionLookup::getMangledNamesForImplicitConversions() const
{
return GetMangledNames(mName.data(), mArguments);
}
bool TFunctionLookup::isConstructor() const
{
return mConstructorType != nullptr;
}
const TType &TFunctionLookup::constructorType() const
{
return *mConstructorType;
}
void TFunctionLookup::setThisNode(TIntermTyped *thisNode)
{
mThisNode = thisNode;
}
TIntermTyped *TFunctionLookup::thisNode() const
{
return mThisNode;
}
void TFunctionLookup::addArgument(TIntermTyped *argument)
{
mArguments.push_back(argument);
}
TIntermSequence &TFunctionLookup::arguments()
{
return mArguments;
}
const TSymbol *TFunctionLookup::symbol() const
{
return mSymbol;
}
} // namespace sh