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"
14 #include "llvm/DerivedTypes.h"
15 #include "llvm/ConstPoolVals.h"
19 // TargetData Hack: Eventually we will have annotations given to us by the
20 // backend so that we know stuff about type size and alignments. For now
21 // though, just use this, because it happens to match the model that GCC uses.
23 // FIXME: This should use annotations
25 extern const TargetData TD;
27 static int getConstantValue(const ConstPoolInt *CPI) {
28 if (const ConstPoolSInt *CSI = dyn_cast<ConstPoolSInt>(CPI))
29 return CSI->getValue();
30 return cast<ConstPoolUInt>(CPI)->getValue();
34 // isFirstClassType - Return true if a value of the specified type can be held
37 static inline bool isFirstClassType(const Type *Ty) {
38 return Ty->isPrimitiveType() || Ty->isPointerType();
41 // getPointedToComposite - If the argument is a pointer type, and the pointed to
42 // value is a composite type, return the composite type, else return null.
44 static inline const CompositeType *getPointedToComposite(const Type *Ty) {
45 const PointerType *PT = dyn_cast<PointerType>(Ty);
46 return PT ? dyn_cast<CompositeType>(PT->getValueType()) : 0;
50 // ReplaceInstWithValue - Replace all uses of an instruction (specified by BI)
51 // with a value, then remove and delete the original instruction.
53 void ReplaceInstWithValue(BasicBlock::InstListType &BIL,
54 BasicBlock::iterator &BI, Value *V);
56 // ReplaceInstWithInst - Replace the instruction specified by BI with the
57 // instruction specified by I. The original instruction is deleted and BI is
58 // updated to point to the new instruction.
60 void ReplaceInstWithInst(BasicBlock::InstListType &BIL,
61 BasicBlock::iterator &BI, Instruction *I);
64 // ConvertableToGEP - This function returns true if the specified value V is
65 // a valid index into a pointer of type Ty. If it is valid, Idx is filled in
66 // with the values that would be appropriate to make this a getelementptr
67 // instruction. The type returned is the root type that the GEP would point
68 // to if it were synthesized with this operands.
70 // If BI is nonnull, cast instructions are inserted as appropriate for the
71 // arguments of the getelementptr.
73 const Type *ConvertableToGEP(const Type *Ty, Value *V, vector<Value*> &Indices,
74 BasicBlock::iterator *BI = 0);
77 // ------------- Expression Conversion ---------------------
79 typedef map<const Value*, const Type*> ValueTypeCache;
81 struct ValueMapCache {
82 // Operands mapped - Contains an entry if the first value (the user) has had
83 // the second value (the operand) mapped already.
85 set<const User*> OperandsMapped;
87 // Expression Map - Contains an entry from the old value to the new value of
88 // an expression that has been converted over.
90 map<const Value *, Value *> ExprMap;
91 typedef map<const Value *, Value *> ExprMapTy;
95 bool ExpressionConvertableToType(Value *V, const Type *Ty, ValueTypeCache &Map);
96 Value *ConvertExpressionToType(Value *V, const Type *Ty, ValueMapCache &VMC);
98 // ValueConvertableToType - Return true if it is possible
99 bool ValueConvertableToType(Value *V, const Type *Ty,
100 ValueTypeCache &ConvertedTypes);
102 void ConvertValueToNewType(Value *V, Value *NewVal, ValueMapCache &VMC);
105 //===----------------------------------------------------------------------===//
106 // ValueHandle Class - Smart pointer that occupies a slot on the users USE list
107 // that prevents it from being destroyed. This "looks" like an Instruction
108 // with Opcode UserOp1.
110 class ValueHandle : public Instruction {
111 ValueHandle(const ValueHandle &); // DO NOT IMPLEMENT
112 ValueMapCache &Cache;
114 ValueHandle(ValueMapCache &VMC, Value *V);
117 virtual Instruction *clone() const { abort(); return 0; }
119 virtual const char *getOpcodeName() const {
120 return "ValueHandle";
123 // Methods for support type inquiry through isa, cast, and dyn_cast:
124 static inline bool classof(const ValueHandle *) { return true; }
125 static inline bool classof(const Instruction *I) {
126 return (I->getOpcode() == Instruction::UserOp1);
128 static inline bool classof(const Value *V) {
129 return isa<Instruction>(V) && classof(cast<Instruction>(V));
133 // getStructOffsetType - Return a vector of offsets that are to be used to index
134 // into the specified struct type to get as close as possible to index as we
135 // can. Note that it is possible that we cannot get exactly to Offset, in which
136 // case we update offset to be the offset we actually obtained. The resultant
137 // leaf type is returned.
139 // If StopEarly is set to true (the default), the first object with the
140 // specified type is returned, even if it is a struct type itself. In this
141 // case, this routine will not drill down to the leaf type. Set StopEarly to
142 // false if you want a leaf
144 const Type *getStructOffsetType(const Type *Ty, unsigned &Offset,
145 vector<Value*> &Offsets,
146 bool StopEarly = true);