-//===-- ConstantHandling.h - Stuff for manipulating constants ----*- C++ -*--=//
-//
-// This file contains the declarations of some cool operators that allow you
-// to do natural things with constant pool values.
-//
-// Unfortunately we can't overload operators on pointer types (like this:)
-//
-// inline bool operator==(const Constant *V1, const Constant *V2)
-//
-// so we must make due with references, even though it leads to some butt ugly
-// looking code downstream. *sigh* (ex: Constant *Result = *V1 + *v2; )
-//
-//===----------------------------------------------------------------------===//
-//
-// WARNING: These operators may return a null object if I don't know how to
-// perform the specified operation on the specified constant types.
-//
-//===----------------------------------------------------------------------===//
-//
-// Implementation notes:
-// This library is implemented this way for a reason: In most cases, we do
-// not want to have to link the constant mucking code into an executable.
-// We do, however want to tie some of this into the main type system, as an
-// optional component. By using a mutable cache member in the Type class, we
-// get exactly the kind of behavior we want.
-//
-// In the end, we get performance almost exactly the same as having a virtual
-// function dispatch, but we don't have to put our virtual functions into the
-// "Type" class, and we can implement functionality with templates. Good deal.
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef LLVM_CONSTANTHANDLING_H
-#define LLVM_CONSTANTHANDLING_H
-
-#include "llvm/Constants.h"
-#include "llvm/Instruction.h"
-#include "llvm/Type.h"
-class PointerType;
-
-//===----------------------------------------------------------------------===//
-// Implement == and != directly...
-//===----------------------------------------------------------------------===//
-
-inline ConstantBool *operator==(const Constant &V1,
- const Constant &V2) {
- assert(V1.getType() == V2.getType() && "Constant types must be identical!");
- return ConstantBool::get(&V1 == &V2);
-}
-
-inline ConstantBool *operator!=(const Constant &V1,
- const Constant &V2) {
- return ConstantBool::get(&V1 != &V2);
-}
-
-//===----------------------------------------------------------------------===//
-// Implement all other operators indirectly through TypeRules system
-//===----------------------------------------------------------------------===//
-
-class ConstRules : public Annotation {
-protected:
- inline ConstRules() : Annotation(AID) {} // Can only be subclassed...
-public:
- static AnnotationID AID; // AnnotationID for this class
-
- // Unary Operators...
- virtual Constant *op_not(const Constant *V) const = 0;
-
- // Binary Operators...
- virtual Constant *add(const Constant *V1, const Constant *V2) const = 0;
- virtual Constant *sub(const Constant *V1, const Constant *V2) const = 0;
- virtual Constant *mul(const Constant *V1, const Constant *V2) const = 0;
- virtual Constant *div(const Constant *V1, const Constant *V2) const = 0;
- virtual Constant *rem(const Constant *V1, const Constant *V2) const = 0;
-
- virtual ConstantBool *lessthan(const Constant *V1,
- const Constant *V2) const = 0;
-
- // Casting operators. ick
- virtual ConstantBool *castToBool (const Constant *V) const = 0;
- virtual ConstantSInt *castToSByte (const Constant *V) const = 0;
- virtual ConstantUInt *castToUByte (const Constant *V) const = 0;
- virtual ConstantSInt *castToShort (const Constant *V) const = 0;
- virtual ConstantUInt *castToUShort(const Constant *V) const = 0;
- virtual ConstantSInt *castToInt (const Constant *V) const = 0;
- virtual ConstantUInt *castToUInt (const Constant *V) const = 0;
- virtual ConstantSInt *castToLong (const Constant *V) const = 0;
- virtual ConstantUInt *castToULong (const Constant *V) const = 0;
- virtual ConstantFP *castToFloat (const Constant *V) const = 0;
- virtual ConstantFP *castToDouble(const Constant *V) const = 0;
- virtual ConstantPointer *castToPointer(const Constant *V,
- const PointerType *Ty) const = 0;
-
- inline Constant *castTo(const Constant *V, const Type *Ty) const {
- switch (Ty->getPrimitiveID()) {
- case Type::BoolTyID: return castToBool(V);
- case Type::UByteTyID: return castToUByte(V);
- case Type::SByteTyID: return castToSByte(V);
- case Type::UShortTyID: return castToUShort(V);
- case Type::ShortTyID: return castToShort(V);
- case Type::UIntTyID: return castToUInt(V);
- case Type::IntTyID: return castToInt(V);
- case Type::ULongTyID: return castToULong(V);
- 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;
- }
- }
-
- // ConstRules::get - A type will cache its own type rules if one is needed...
- // we just want to make sure to hit the cache instead of doing it indirectly,
- // if possible...
- //
- static inline ConstRules *get(const Constant &V) {
- return (ConstRules*)V.getType()->getOrCreateAnnotation(AID);
- }
-private :
- static Annotation *find(AnnotationID AID, const Annotable *Ty, void *);
-
- ConstRules(const ConstRules &); // Do not implement
- ConstRules &operator=(const ConstRules &); // Do not implement
-};
-
-
-inline Constant *operator~(const Constant &V) {
- return ConstRules::get(V)->op_not(&V);
-}
-
-
-
-inline Constant *operator+(const Constant &V1, const Constant &V2) {
- assert(V1.getType() == V2.getType() && "Constant types must be identical!");
- return ConstRules::get(V1)->add(&V1, &V2);
-}
-
-inline Constant *operator-(const Constant &V1, const Constant &V2) {
- assert(V1.getType() == V2.getType() && "Constant types must be identical!");
- return ConstRules::get(V1)->sub(&V1, &V2);
-}
-
-inline Constant *operator*(const Constant &V1, const Constant &V2) {
- assert(V1.getType() == V2.getType() && "Constant types must be identical!");
- return ConstRules::get(V1)->mul(&V1, &V2);
-}
-
-inline Constant *operator/(const Constant &V1, const Constant &V2) {
- assert(V1.getType() == V2.getType() && "Constant types must be identical!");
- return ConstRules::get(V1)->div(&V1, &V2);
-}
-
-inline Constant *operator%(const Constant &V1, const Constant &V2) {
- assert(V1.getType() == V2.getType() && "Constant types must be identical!");
- return ConstRules::get(V1)->rem(&V1, &V2);
-}
-
-inline ConstantBool *operator<(const Constant &V1,
- const Constant &V2) {
- assert(V1.getType() == V2.getType() && "Constant types must be identical!");
- return ConstRules::get(V1)->lessthan(&V1, &V2);
-}
-
-
-//===----------------------------------------------------------------------===//
-// Implement 'derived' operators based on what we already have...
-//===----------------------------------------------------------------------===//
-
-inline ConstantBool *operator>(const Constant &V1,
- const Constant &V2) {
- return V2 < V1;
-}
-
-inline ConstantBool *operator>=(const Constant &V1,
- const Constant &V2) {
- return (V1 < V2)->inverted(); // !(V1 < V2)
-}
-
-inline ConstantBool *operator<=(const Constant &V1,
- const Constant &V2) {
- return (V1 > V2)->inverted(); // !(V1 > V2)
-}
-
-
-//===----------------------------------------------------------------------===//
-// Implement higher level instruction folding type instructions
-//===----------------------------------------------------------------------===//
-
-inline Constant *ConstantFoldCastInstruction(const Constant *V,
- const Type *DestTy) {
- return ConstRules::get(*V)->castTo(V, DestTy);
-}
-
-inline Constant *ConstantFoldUnaryInstruction(unsigned Opcode,
- const Constant *V) {
- switch (Opcode) {
- case Instruction::Not: return ~*V;
- }
- return 0;
-}
-
-inline Constant *ConstantFoldBinaryInstruction(unsigned Opcode,
- const Constant *V1,
- const Constant *V2) {
- switch (Opcode) {
- case Instruction::Add: return *V1 + *V2;
- case Instruction::Sub: return *V1 - *V2;
- case Instruction::Mul: return *V1 * *V2;
- case Instruction::Div: return *V1 / *V2;
- case Instruction::Rem: return *V1 % *V2;
-
- case Instruction::SetEQ: return *V1 == *V2;
- case Instruction::SetNE: return *V1 != *V2;
- case Instruction::SetLE: return *V1 <= *V2;
- case Instruction::SetGE: return *V1 >= *V2;
- case Instruction::SetLT: return *V1 < *V2;
- case Instruction::SetGT: return *V1 > *V2;
- }
- return 0;
-}
+//===-- ConstantFolding.h - Internal Constant Folding Interface -*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines the (internal) constant folding interfaces for LLVM. These
+// interfaces are used by the ConstantExpr::get* methods to automatically fold
+// constants when possible.
+//
+// These operators may return a null object if I don't know how to perform the
+// specified operation on the specified constant types.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef CONSTANTFOLDING_H
+#define CONSTANTFOLDING_H
+
+namespace llvm {
+ class Value;
+ class Constant;
+ class Type;
+
+ // Constant fold various types of instruction...
+ Constant *ConstantFoldCastInstruction(
+ unsigned opcode, ///< The opcode of the cast
+ const Constant *V, ///< The source constant
+ const Type *DestTy ///< The destination type
+ );
+ Constant *ConstantFoldSelectInstruction(const Constant *Cond,
+ const Constant *V1,
+ const Constant *V2);
+ Constant *ConstantFoldExtractElementInstruction(const Constant *Val,
+ const Constant *Idx);
+ Constant *ConstantFoldInsertElementInstruction(const Constant *Val,
+ const Constant *Elt,
+ const Constant *Idx);
+ Constant *ConstantFoldShuffleVectorInstruction(const Constant *V1,
+ const Constant *V2,
+ const Constant *Mask);
+ Constant *ConstantFoldBinaryInstruction(unsigned Opcode, const Constant *V1,
+ const Constant *V2);
+ Constant *ConstantFoldCompareInstruction(unsigned short predicate,
+ const Constant *C1,
+ const Constant *C2);
+ Constant *ConstantFoldGetElementPtr(const Constant *C,
+ Constant* const *Idxs, unsigned NumIdx);
+} // End llvm namespace
#endif
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