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Implement constant propogation of null pointer values.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@1078 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2001-11-01 05:55:13 +00:00
parent d558426b0e
commit 76ac1a45b4
4 changed files with 88 additions and 1 deletions
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4
include/llvm/ConstantHandling.h
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@ -36,6 +36,7 @@
#include "llvm/ConstPoolVals.h"
#include "llvm/Instruction.h"
#include "llvm/Type.h"
class PointerType;
namespace opt {
@ -90,6 +91,8 @@ public:
virtual ConstPoolUInt *castToULong (const ConstPoolVal *V) const = 0;
virtual ConstPoolFP *castToFloat (const ConstPoolVal *V) const = 0;
virtual ConstPoolFP *castToDouble(const ConstPoolVal *V) const = 0;
virtual ConstPoolPointer *castToPointer(const ConstPoolVal *V,
const PointerType *Ty) const = 0;
inline ConstPoolVal *castTo(const ConstPoolVal *V, const Type *Ty) const {
switch (Ty->getPrimitiveID()) {
@ -104,6 +107,7 @@ public:
case Type::LongTyID: return castToLong(V);
case Type::FloatTyID: return castToFloat(V);
case Type::DoubleTyID: return castToDouble(V);
case Type::PointerTyID:return castToPointer(V, (PointerType*)Ty);
default: return 0;
}
}

77
lib/VMCore/ConstantFold.cpp
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@ -89,6 +89,10 @@ class TemplateRules : public ConstRules {
virtual ConstPoolFP *castToDouble(const ConstPoolVal *V) const {
return SubClassName::CastToDouble((const ArgType*)V);
}
virtual ConstPoolPointer *castToPointer(const ConstPoolVal *V,
const PointerType *Ty) const {
return SubClassName::CastToPointer((const ArgType*)V, Ty);
}
//===--------------------------------------------------------------------===//
// Default "noop" implementations
@ -121,6 +125,8 @@ class TemplateRules : public ConstRules {
inline static ConstPoolUInt *CastToULong (const ConstPoolVal *V) { return 0; }
inline static ConstPoolFP *CastToFloat (const ConstPoolVal *V) { return 0; }
inline static ConstPoolFP *CastToDouble(const ConstPoolVal *V) { return 0; }
inline static ConstPoolPointer *CastToPointer(const ConstPoolVal *,
const PointerType *) {return 0;}
};
@ -160,6 +166,67 @@ struct BoolRules : public TemplateRules<ConstPoolBool, BoolRules> {
};
//===----------------------------------------------------------------------===//
// PointerRules Class
//===----------------------------------------------------------------------===//
//
// PointerRules provides a concrete base class of ConstRules for pointer types
//
struct PointerRules : public TemplateRules<ConstPoolPointer, PointerRules> {
inline static ConstPoolBool *CastToBool (const ConstPoolVal *V) {
if (V->isNullValue()) return ConstPoolBool::False;
return 0; // Can't const prop other types of pointers
}
inline static ConstPoolSInt *CastToSByte (const ConstPoolVal *V) {
if (V->isNullValue()) return ConstPoolSInt::get(Type::SByteTy, 0);
return 0; // Can't const prop other types of pointers
}
inline static ConstPoolUInt *CastToUByte (const ConstPoolVal *V) {
if (V->isNullValue()) return ConstPoolUInt::get(Type::UByteTy, 0);
return 0; // Can't const prop other types of pointers
}
inline static ConstPoolSInt *CastToShort (const ConstPoolVal *V) {
if (V->isNullValue()) return ConstPoolSInt::get(Type::ShortTy, 0);
return 0; // Can't const prop other types of pointers
}
inline static ConstPoolUInt *CastToUShort(const ConstPoolVal *V) {
if (V->isNullValue()) return ConstPoolUInt::get(Type::UShortTy, 0);
return 0; // Can't const prop other types of pointers
}
inline static ConstPoolSInt *CastToInt (const ConstPoolVal *V) {
if (V->isNullValue()) return ConstPoolSInt::get(Type::IntTy, 0);
return 0; // Can't const prop other types of pointers
}
inline static ConstPoolUInt *CastToUInt (const ConstPoolVal *V) {
if (V->isNullValue()) return ConstPoolUInt::get(Type::UIntTy, 0);
return 0; // Can't const prop other types of pointers
}
inline static ConstPoolSInt *CastToLong (const ConstPoolVal *V) {
if (V->isNullValue()) return ConstPoolSInt::get(Type::LongTy, 0);
return 0; // Can't const prop other types of pointers
}
inline static ConstPoolUInt *CastToULong (const ConstPoolVal *V) {
if (V->isNullValue()) return ConstPoolUInt::get(Type::ULongTy, 0);
return 0; // Can't const prop other types of pointers
}
inline static ConstPoolFP *CastToFloat (const ConstPoolVal *V) {
if (V->isNullValue()) return ConstPoolFP::get(Type::FloatTy, 0);
return 0; // Can't const prop other types of pointers
}
inline static ConstPoolFP *CastToDouble(const ConstPoolVal *V) {
if (V->isNullValue()) return ConstPoolFP::get(Type::DoubleTy, 0);
return 0; // Can't const prop other types of pointers
}
inline static ConstPoolPointer *CastToPointer(const ConstPoolPointer *V,
const PointerType *PTy) {
if (V->isNullValue())
return ConstPoolPointerNull::get(PTy);
return 0; // Can't const prop other types of pointers
}
};
//===----------------------------------------------------------------------===//
// DirectRules Class
//===----------------------------------------------------------------------===//
@ -204,6 +271,13 @@ struct DirectRules
return ConstPoolBool::get(Result);
}
inline static ConstPoolPointer *CastToPointer(const ConstPoolClass *V,
const PointerType *PTy) {
if (V->isNullValue()) // Is it a FP or Integral null value?
return ConstPoolPointerNull::get(PTy);
return 0; // Can't const prop other types of pointers
}
// Casting operators. ick
#define DEF_CAST(TYPE, CLASS, CTYPE) \
inline static CLASS *CastTo##TYPE (const ConstPoolClass *V) { \
@ -241,7 +315,8 @@ Annotation *ConstRules::find(AnnotationID AID, const Annotable *TyA, void *) {
const Type *Ty = cast<Type>((const Value*)TyA);
switch (Ty->getPrimitiveID()) {
case Type::BoolTyID: return new BoolRules();
case Type::BoolTyID: return new BoolRules();
case Type::PointerTyID: return new PointerRules();
case Type::SByteTyID:
return new DirectRules<ConstPoolSInt, signed char , &Type::SByteTy>();
case Type::UByteTyID:

4
lib/VMCore/ConstantFold.h
View File

@ -36,6 +36,7 @@
#include "llvm/ConstPoolVals.h"
#include "llvm/Instruction.h"
#include "llvm/Type.h"
class PointerType;
namespace opt {
@ -90,6 +91,8 @@ public:
virtual ConstPoolUInt *castToULong (const ConstPoolVal *V) const = 0;
virtual ConstPoolFP *castToFloat (const ConstPoolVal *V) const = 0;
virtual ConstPoolFP *castToDouble(const ConstPoolVal *V) const = 0;
virtual ConstPoolPointer *castToPointer(const ConstPoolVal *V,
const PointerType *Ty) const = 0;
inline ConstPoolVal *castTo(const ConstPoolVal *V, const Type *Ty) const {
switch (Ty->getPrimitiveID()) {
@ -104,6 +107,7 @@ public:
case Type::LongTyID: return castToLong(V);
case Type::FloatTyID: return castToFloat(V);
case Type::DoubleTyID: return castToDouble(V);
case Type::PointerTyID:return castToPointer(V, (PointerType*)Ty);
default: return 0;
}
}

4
lib/VMCore/ConstantFolding.h
View File

@ -36,6 +36,7 @@
#include "llvm/ConstPoolVals.h"
#include "llvm/Instruction.h"
#include "llvm/Type.h"
class PointerType;
namespace opt {
@ -90,6 +91,8 @@ public:
virtual ConstPoolUInt *castToULong (const ConstPoolVal *V) const = 0;
virtual ConstPoolFP *castToFloat (const ConstPoolVal *V) const = 0;
virtual ConstPoolFP *castToDouble(const ConstPoolVal *V) const = 0;
virtual ConstPoolPointer *castToPointer(const ConstPoolVal *V,
const PointerType *Ty) const = 0;
inline ConstPoolVal *castTo(const ConstPoolVal *V, const Type *Ty) const {
switch (Ty->getPrimitiveID()) {
@ -104,6 +107,7 @@ public:
case Type::LongTyID: return castToLong(V);
case Type::FloatTyID: return castToFloat(V);
case Type::DoubleTyID: return castToDouble(V);
case Type::PointerTyID:return castToPointer(V, (PointerType*)Ty);
default: return 0;
}
}