1 //===-- TransformInternals.h - Shared functions for Transforms ---*- C++ -*--=//
3 // This header file declares shared functions used by the different components
4 // of the Transforms library.
6 //===----------------------------------------------------------------------===//
8 #ifndef TRANSFORM_INTERNALS_H
9 #define TRANSFORM_INTERNALS_H
11 #include "llvm/BasicBlock.h"
12 #include "llvm/Instruction.h"
13 #include "llvm/Target/TargetData.h"
17 // TargetData Hack: Eventually we will have annotations given to us by the
18 // backend so that we know stuff about type size and alignments. For now
19 // though, just use this, because it happens to match the model that GCC uses.
21 // FIXME: This should use annotations
23 extern const TargetData TD;
25 // losslessCastableTypes - Return true if the types are bitwise equivalent.
26 // This predicate returns true if it is possible to cast from one type to
27 // another without gaining or losing precision, or altering the bits in any way.
29 bool losslessCastableTypes(const Type *T1, const Type *T2);
32 // ReplaceInstWithValue - Replace all uses of an instruction (specified by BI)
33 // with a value, then remove and delete the original instruction.
35 void ReplaceInstWithValue(BasicBlock::InstListType &BIL,
36 BasicBlock::iterator &BI, Value *V);
38 // ReplaceInstWithInst - Replace the instruction specified by BI with the
39 // instruction specified by I. The original instruction is deleted and BI is
40 // updated to point to the new instruction.
42 void ReplaceInstWithInst(BasicBlock::InstListType &BIL,
43 BasicBlock::iterator &BI, Instruction *I);
46 // ------------- Expression Conversion ---------------------
48 typedef map<const Value*, const Type*> ValueTypeCache;
50 struct ValueMapCache {
51 // Operands mapped - Contains an entry if the first value (the user) has had
52 // the second value (the operand) mapped already.
54 set<pair<const User*, const Value*> > OperandsMapped;
56 // Expression Map - Contains an entry from the old value to the new value of
57 // an expression that has been converted over.
59 map<const Value *, Value *> ExprMap;
60 typedef map<const Value *, Value *> ExprMapTy;
63 // RetValConvertableToType - Return true if it is possible
64 bool RetValConvertableToType(Value *V, const Type *Ty,
65 ValueTypeCache &ConvertedTypes);
67 void ConvertUsersType(Value *V, Value *NewVal, ValueMapCache &VMC);
70 //===----------------------------------------------------------------------===//
71 // ValueHandle Class - Smart pointer that occupies a slot on the users USE list
72 // that prevents it from being destroyed. This "looks" like an Instruction
73 // with Opcode UserOp1.
75 class ValueHandle : public Instruction {
76 ValueHandle(const ValueHandle &); // DO NOT IMPLEMENT
78 ValueHandle(Value *V) : Instruction(Type::VoidTy, UserOp1, "") {
79 Operands.push_back(Use(V, this));
84 virtual Instruction *clone() const { abort(); return 0; }
86 virtual const char *getOpcodeName() const {
90 // Methods for support type inquiry through isa, cast, and dyn_cast:
91 static inline bool classof(const ValueHandle *) { return true; }
92 static inline bool classof(const Instruction *I) {
93 return (I->getOpcode() == Instruction::UserOp1);
95 static inline bool classof(const Value *V) {
96 return isa<Instruction>(V) && classof(cast<Instruction>(V));