mirror of
https://github.com/c64scene-ar/llvm-6502.git
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8ee0064983
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@236 91177308-0d34-0410-b5e6-96231b3b80d8
109 lines
2.7 KiB
C++
109 lines
2.7 KiB
C++
//===-- llvm/ConstPoolVals.cpp - Implement Constant Value nodes -*- C++ -*--=//
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//
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// This file implements the ConstPoolVal class and associated functions.
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//
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//===---------------------------------------------------------------------===//
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#include "llvm/Type.h"
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#include "llvm/Value.h"
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#include "llvm/ConstPoolVals.h"
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//===--------------------------------------------------------------------------
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// External functions
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//
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// Convenience functions to get the value of an integer constant, for an
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// appropriate integer or non-integer type that can be held in an integer.
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// The type of the argument must be the following:
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// GetSignedIntConstantValue: signed integer or bool
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// GetUnsignedIntConstantValue: unsigned integer, bool, or pointer
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// GetConstantValueAsSignedInt: any of the above, but the value
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// must fit into a int64_t.
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//
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// isValidConstant is set to true if a valid constant was found.
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//
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int64_t
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GetSignedIntConstantValue(const Value* val, bool& isValidConstant)
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{
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int64_t intValue = 0;
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isValidConstant = false;
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if (val->getValueType() == Value::ConstantVal)
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{
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switch(val->getType()->getPrimitiveID())
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{
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case Type::BoolTyID:
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intValue = ((ConstPoolBool*) val)->getValue()? 1 : 0;
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isValidConstant = true;
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break;
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case Type::SByteTyID:
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case Type::ShortTyID:
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case Type::IntTyID:
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case Type::LongTyID:
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intValue = ((ConstPoolSInt*) val)->getValue();
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isValidConstant = true;
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break;
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default:
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break;
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}
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}
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return intValue;
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}
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uint64_t
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GetUnsignedIntConstantValue(const Value* val, bool& isValidConstant)
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{
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uint64_t intValue = 0;
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isValidConstant = false;
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if (val->getValueType() == Value::ConstantVal)
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{
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switch(val->getType()->getPrimitiveID())
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{
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case Type::BoolTyID:
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intValue = ((ConstPoolBool*) val)->getValue()? 1 : 0;
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isValidConstant = true;
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break;
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case Type::UByteTyID:
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case Type::UShortTyID:
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case Type::UIntTyID:
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case Type::ULongTyID:
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case Type::PointerTyID:
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intValue = ((ConstPoolUInt*) val)->getValue();
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isValidConstant = true;
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break;
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default:
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break;
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}
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}
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return intValue;
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}
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int64_t
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GetConstantValueAsSignedInt(const Value* val, bool& isValidConstant)
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{
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int64_t intValue = 0;
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if (val->getType()->isSigned())
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{
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intValue = GetSignedIntConstantValue(val, isValidConstant);
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}
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else // non-numeric types will fall here
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{
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uint64_t uintValue = GetUnsignedIntConstantValue(val, isValidConstant);
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if (isValidConstant && uintValue < INT64_MAX) // then safe to cast to signed
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intValue = (int64_t) uintValue;
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else
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isValidConstant = false;
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}
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return intValue;
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}
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//===--------------------------------------------------------------------------
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