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"
18 #include "llvm/AbstractTypeUser.h"
26 class MutateStructTypes : public Pass {
27 // TransformType - Representation of the destination type for a particular
28 // incoming structure. The first member is the destination type that we are
29 // mapping to, and the second member is the destination slot # to put each
30 // incoming slot [or negative if the specified incoming slot should be
33 typedef std::pair<const StructType*, std::vector<int> > TransformType;
35 // Transforms to do for each structure type...
36 std::map<const StructType*, TransformType> Transforms;
38 // Mapping of old type to new types...
39 std::map<const Type *, PATypeHolder> TypeMap;
41 // Mapping from global value of old type, to a global value of the new type...
42 std::map<const GlobalValue*, GlobalValue*> GlobalMap;
44 // Mapping from intra function value to intra function value
45 std::map<const Value*, Value*> LocalValueMap;
48 // Ctor - Take a map that specifies what transformation to do for each field
49 // of the specified structure types. There is one element of the vector for
50 // each field of the structure. The value specified indicates which slot of
51 // the destination structure the field should end up in. A negative value
52 // indicates that the field should be deleted entirely.
54 typedef std::map<const StructType*, std::vector<int> > TransformsType;
56 MutateStructTypes(const TransformsType &Transforms) {
57 setTransforms(Transforms);
60 // run - do the transformation
61 virtual bool run(Module *M);
65 // Alternatively, it is valid to subclass this class and provide transforms
66 // this way. See SimpleStructMutation for an example.
68 MutateStructTypes() {}
69 void setTransforms(const TransformsType &Transforms);
70 void clearTransforms();
74 // processGlobals - This loops over global constants defined in the
75 // module, converting them to their new type. Also this creates placeholder
76 // functions for functions than need to be copied because they have a new
79 void processGlobals(Module *M);
81 // transformFunction - This transforms the instructions of the function to use
84 void transformFunction(Function *F);
86 // removeDeadGlobals - This removes the old versions of functions that are no
89 void removeDeadGlobals(Module *M);
92 // ConvertType - Convert from the old type system to the new one...
93 const Type *ConvertType(const Type *Ty);
95 // ConvertValue - Convert from the old value in the old type system to the new
98 Value *ConvertValue(const Value *V);
100 // AdjustIndices - Convert the indexes specifed by Idx to the new changed form
101 // using the specified OldTy as the base type being indexed into.
103 void AdjustIndices(const CompositeType *OldTy, std::vector<Value*> &Idx,