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//===-- TransformInternals.h - Shared functions for Transforms ---*- C++ -*--=//
//
// This header file declares shared functions used by the different components
// of the Transforms library.
//
//===----------------------------------------------------------------------===//
#ifndef TRANSFORM_INTERNALS_H
#define TRANSFORM_INTERNALS_H
#include "llvm/BasicBlock.h"
#include "llvm/Instruction.h"
#include "llvm/Target/TargetData.h"
#include <map>
#include <set>
// TargetData Hack: Eventually we will have annotations given to us by the
// backend so that we know stuff about type size and alignments. For now
// though, just use this, because it happens to match the model that GCC uses.
//
// FIXME: This should use annotations
//
extern const TargetData TD;
// losslessCastableTypes - Return true if the types are bitwise equivalent.
// This predicate returns true if it is possible to cast from one type to
// another without gaining or losing precision, or altering the bits in any way.
//
bool losslessCastableTypes(const Type *T1, const Type *T2);
// ReplaceInstWithValue - Replace all uses of an instruction (specified by BI)
// with a value, then remove and delete the original instruction.
//
void ReplaceInstWithValue(BasicBlock::InstListType &BIL,
BasicBlock::iterator &BI, Value *V);
// ReplaceInstWithInst - Replace the instruction specified by BI with the
// instruction specified by I. The original instruction is deleted and BI is
// updated to point to the new instruction.
//
void ReplaceInstWithInst(BasicBlock::InstListType &BIL,
BasicBlock::iterator &BI, Instruction *I);
// ------------- Expression Conversion ---------------------
typedef map<const Value*, const Type*> ValueTypeCache;
struct ValueMapCache {
// Operands mapped - Contains an entry if the first value (the user) has had
// the second value (the operand) mapped already.
//
set<pair<const User*, const Value*> > OperandsMapped;
// Expression Map - Contains an entry from the old value to the new value of
// an expression that has been converted over.
//
map<const Value *, Value *> ExprMap;
typedef map<const Value *, Value *> ExprMapTy;
};
// RetValConvertableToType - Return true if it is possible
bool RetValConvertableToType(Value *V, const Type *Ty,
ValueTypeCache &ConvertedTypes);
void ConvertUsersType(Value *V, Value *NewVal, ValueMapCache &VMC);
//===----------------------------------------------------------------------===//
// ValueHandle Class - Smart pointer that occupies a slot on the users USE list
// that prevents it from being destroyed. This "looks" like an Instruction
// with Opcode UserOp1.
//
class ValueHandle : public Instruction {
ValueHandle(const ValueHandle &); // DO NOT IMPLEMENT
public:
ValueHandle(Value *V) : Instruction(Type::VoidTy, UserOp1, "") {
Operands.push_back(Use(V, this));
}
~ValueHandle();
virtual Instruction *clone() const { abort(); return 0; }
virtual const char *getOpcodeName() const {
return "ValueHandle";
}
// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const ValueHandle *) { return true; }
static inline bool classof(const Instruction *I) {
return (I->getOpcode() == Instruction::UserOp1);
}
static inline bool classof(const Value *V) {
return isa<Instruction>(V) && classof(cast<Instruction>(V));
}
};
#endif
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