1 //===- llvm/Transforms/MutateStructTypes.h - Change struct defns -*- C++ -*--=//
3 // This pass is used to change structure accesses and type definitions in some
4 // way. It can be used to arbitrarily permute structure fields, safely, without
5 // breaking code. A transformation may only be done on a type if that type has
6 // been found to be "safe" by the 'FindUnsafePointerTypes' pass. This pass will
7 // assert and die if you try to do an illegal transformation.
9 // This is an interprocedural pass that requires the entire program to do a
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_TRANSFORMS_MUTATESTRUCTTYPES_H
15 #define LLVM_TRANSFORMS_MUTATESTRUCTTYPES_H
17 #include "llvm/Pass.h"
23 class MutateStructTypes : public Pass {
24 // TransformType - Representation of the destination type for a particular
25 // incoming structure. The first member is the destination type that we are
26 // mapping to, and the second member is the destination slot # to put each
27 // incoming slot [or negative if the specified incoming slot should be
30 typedef pair<const StructType*, vector<int> > TransformType;
32 // Transforms to do for each structure type...
33 map<const StructType*, TransformType> Transforms;
35 // Mapping of old type to new types...
36 map<const Type *, PATypeHolder<Type> > TypeMap;
38 // Mapping from global value of old type, to a global value of the new type...
39 map<const GlobalValue*, GlobalValue*> GlobalMap;
41 // Mapping from intra method value to intra method value
42 map<const Value*, Value*> LocalValueMap;
45 // Ctor - Take a map that specifies what transformation to do for each field
46 // of the specified structure types. There is one element of the vector for
47 // each field of the structure. The value specified indicates which slot of
48 // the destination structure the field should end up in. A negative value
49 // indicates that the field should be deleted entirely.
51 MutateStructTypes(const map<const StructType*, vector<int> > &Transforms);
54 // doPassInitialization - This loops over global constants defined in the
55 // module, converting them to their new type. Also this creates placeholder
56 // methods for methods than need to be copied because they have a new
59 bool doPassInitialization(Module *M);
61 // doPerMethodWork - This transforms the instructions of the method to use the
64 bool doPerMethodWork(Method *M);
66 // doPassFinalization - This removes the old versions of methods that are no
69 virtual bool doPassFinalization(Module *M);
72 // ConvertType - Convert from the old type system to the new one...
73 const Type *ConvertType(const Type *Ty);
75 // ConvertValue - Convert from the old value in the old type system to the new
78 Value *ConvertValue(const Value *V);
80 // AdjustIndices - Convert the indexes specifed by Idx to the new changed form
81 // using the specified OldTy as the base type being indexed into.
83 void AdjustIndices(const StructType *OldTy, vector<ConstPoolVal*> &Idx,