1 //===- Cloning.h - Clone various parts of LLVM programs ---------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines various functions that are used to clone chunks of LLVM
11 // code for various purposes. This varies from copying whole modules into new
12 // modules, to cloning functions with different arguments, to inlining
13 // functions, to copying basic blocks to support loop unrolling or superblock
16 //===----------------------------------------------------------------------===//
18 #ifndef LLVM_TRANSFORMS_UTILS_CLONING_H
19 #define LLVM_TRANSFORMS_UTILS_CLONING_H
32 /// CloneModule - Return an exact copy of the specified module
34 Module *CloneModule(const Module *M);
36 /// CloneBasicBlock - Return a copy of the specified basic block, but without
37 /// embedding the block into a particular function. The block returned is an
38 /// exact copy of the specified basic block, without any remapping having been
39 /// performed. Because of this, this is only suitable for applications where
40 /// the basic block will be inserted into the same function that it was cloned
41 /// from (loop unrolling would use this, for example).
43 /// Also, note that this function makes a direct copy of the basic block, and
44 /// can thus produce illegal LLVM code. In particular, it will copy any PHI
45 /// nodes from the original block, even though there are no predecessors for the
46 /// newly cloned block (thus, phi nodes will have to be updated). Also, this
47 /// block will branch to the old successors of the original block: these
48 /// successors will have to have any PHI nodes updated to account for the new
51 /// The correlation between instructions in the source and result basic blocks
52 /// is recorded in the ValueMap map.
54 /// If you have a particular suffix you'd like to use to add to any cloned
55 /// names, specify it as the optional second parameter.
57 BasicBlock *CloneBasicBlock(const BasicBlock *BB,
58 std::map<const Value*, Value*> &ValueMap,
59 const char *NameSuffix = "");
62 /// CloneFunction - Return a copy of the specified function, but without
63 /// embedding the function into another module. Also, any references specified
64 /// in the ValueMap are changed to refer to their mapped value instead of the
65 /// original one. If any of the arguments to the function are in the ValueMap,
66 /// the arguments are deleted from the resultant function. The ValueMap is
67 /// updated to include mappings from all of the instructions and basicblocks in
68 /// the function from their old to new values.
70 Function *CloneFunction(const Function *F,
71 std::map<const Value*, Value*> &ValueMap);
73 /// CloneFunction - Version of the function that doesn't need the ValueMap.
75 inline Function *CloneFunction(const Function *F) {
76 std::map<const Value*, Value*> ValueMap;
77 return CloneFunction(F, ValueMap);
80 /// Clone OldFunc into NewFunc, transforming the old arguments into references
81 /// to ArgMap values. Note that if NewFunc already has basic blocks, the ones
82 /// cloned into it will be added to the end of the function. This function
83 /// fills in a list of return instructions, and can optionally append the
84 /// specified suffix to all values cloned.
86 void CloneFunctionInto(Function *NewFunc, const Function *OldFunc,
87 std::map<const Value*, Value*> &ValueMap,
88 std::vector<ReturnInst*> &Returns,
89 const char *NameSuffix = "");
92 /// InlineFunction - This function inlines the called function into the basic
93 /// block of the caller. This returns false if it is not possible to inline
94 /// this call. The program is still in a well defined state if this occurs
97 /// Note that this only does one level of inlining. For example, if the
98 /// instruction 'call B' is inlined, and 'B' calls 'C', then the call to 'C' now
99 /// exists in the instruction stream. Similiarly this will inline a recursive
100 /// function by one level.
102 bool InlineFunction(CallInst *C);
103 bool InlineFunction(InvokeInst *II);
104 bool InlineFunction(CallSite CS);
106 /// CloneTrace - Returns a copy of the specified trace.
107 /// It takes a vector of basic blocks clones the basic blocks, removes internal
108 /// phi nodes, adds it to the same function as the original (although there is
109 /// no jump to it) and returns the new vector of basic blocks.
110 std::vector<BasicBlock *> CloneTrace(const std::vector<BasicBlock*> &origTrace);