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F2730255
typeinference.cpp
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Fri, Mar 13, 9:35 PM
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text/x-c++
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Sun, Mar 15, 9:35 PM (1 d, 14 h)
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rXR Xreate
typeinference.cpp
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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* typeinference.cpp
*
* Author: pgess <v.melnychenko@xreate.org>
* Created on April 16, 2017, 10:13 AM
*/
/**
* \file typeinference.h
* \brief Type inference analysis
*/
#include "typeinference.h"
#include "llvmlayer.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/DerivedTypes.h"
namespace xreate {namespace typeinference {
//TODO type conversion:
//a) automatically expand types int -> bigger int; int -> floating
//b) detect exact type of `num` based on max used numeral / function type
//c) warning if need to truncate (allow/dissalow based on annotations)
llvm::Value*
doAutomaticTypeConversion(llvm::Value* source, llvm::Type* tyTarget, llvm::IRBuilder<>& builder){
if (tyTarget->isIntegerTy() && source->getType()->isIntegerTy())
{
llvm::IntegerType* tyTargetInt = llvm::dyn_cast<llvm::IntegerType>(tyTarget);
llvm::IntegerType* tySourceInt = llvm::dyn_cast<llvm::IntegerType>(source->getType());
if (tyTargetInt->getBitWidth() < tySourceInt->getBitWidth()){
return builder.CreateCast(llvm::Instruction::Trunc, source, tyTarget);
}
if (tyTargetInt->getBitWidth() > tySourceInt->getBitWidth()){
return builder.CreateCast(llvm::Instruction::SExt, source, tyTarget);
}
}
if (source->getType()->isIntegerTy() && tyTarget->isFloatingPointTy()){
return builder.CreateCast(llvm::Instruction::SIToFP, source, tyTarget);
}
return source;
}
ExpandedType
getType(const Expression& expression, const AST& ast){
if (expression.type.isValid()){
return ast.expandType(expression.type);
}
if (expression.__state == Expression::IDENT){
Symbol s = Attachments::get<Symbol>(expression);
return getType(CodeScope::getDefinition(s), ast);
}
assert(false && "Type can't be determined for an expression");
}
} } //end of namespace xreate::typeinference
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