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//===-- llvm/ConstPoolVals.cpp - Implement Constant Value nodes -*- C++ -*--=//
//
// This file implements the ConstPoolVal class and associated functions.
//
//===---------------------------------------------------------------------===//
#include "llvm/Type.h"
#include "llvm/Value.h"
#include "llvm/ConstPoolVals.h"
//===--------------------------------------------------------------------------
// External functions
//
// Convenience functions to get the value of an integer constant, for an
// appropriate integer or non-integer type that can be held in an integer.
// The type of the argument must be the following:
// GetSignedIntConstantValue: signed integer or bool
// GetUnsignedIntConstantValue: unsigned integer, bool, or pointer
// GetConstantValueAsSignedInt: any of the above, but the value
// must fit into a int64_t.
//
// isValidConstant is set to true if a valid constant was found.
//
int64_t
GetSignedIntConstantValue(const Value* val, bool& isValidConstant)
{
int64_t intValue = 0;
isValidConstant = false;
if (val->getValueType() == Value::ConstantVal)
{
switch(val->getType()->getPrimitiveID())
{
case Type::BoolTyID:
intValue = ((ConstPoolBool*) val)->getValue()? 1 : 0;
isValidConstant = true;
break;
case Type::SByteTyID:
case Type::ShortTyID:
case Type::IntTyID:
case Type::LongTyID:
intValue = ((ConstPoolSInt*) val)->getValue();
isValidConstant = true;
break;
default:
break;
}
}
return intValue;
}
uint64_t
GetUnsignedIntConstantValue(const Value* val, bool& isValidConstant)
{
uint64_t intValue = 0;
isValidConstant = false;
if (val->getValueType() == Value::ConstantVal)
{
switch(val->getType()->getPrimitiveID())
{
case Type::BoolTyID:
intValue = ((ConstPoolBool*) val)->getValue()? 1 : 0;
isValidConstant = true;
break;
case Type::UByteTyID:
case Type::UShortTyID:
case Type::UIntTyID:
case Type::ULongTyID:
case Type::PointerTyID:
intValue = ((ConstPoolUInt*) val)->getValue();
isValidConstant = true;
break;
default:
break;
}
}
return intValue;
}
int64_t
GetConstantValueAsSignedInt(const Value* val, bool& isValidConstant)
{
int64_t intValue = 0;
if (val->getType()->isSigned())
{
intValue = GetSignedIntConstantValue(val, isValidConstant);
}
else // non-numeric types will fall here
{
uint64_t uintValue = GetUnsignedIntConstantValue(val, isValidConstant);
if (isValidConstant && uintValue < INT64_MAX) // then safe to cast to signed
intValue = (int64_t) uintValue;
else
isValidConstant = false;
}
return intValue;
}
//===--------------------------------------------------------------------------
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