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
37 /// CloneModule - Return an exact copy of the specified module
39 Module *CloneModule(const Module *M);
40 Module *CloneModule(const Module *M, std::map<const Value*, Value*> &ValueMap);
42 /// ClonedCodeInfo - This struct can be used to capture information about code
43 /// being cloned, while it is being cloned.
44 struct ClonedCodeInfo {
45 /// ContainsCalls - This is set to true if the cloned code contains a normal
49 /// ContainsUnwinds - This is set to true if the cloned code contains an
50 /// unwind instruction.
53 /// ContainsDynamicAllocas - This is set to true if the cloned code contains
54 /// a 'dynamic' alloca. Dynamic allocas are allocas that are either not in
55 /// the entry block or they are in the entry block but are not a constant
57 bool ContainsDynamicAllocas;
60 ContainsCalls = false;
61 ContainsUnwinds = false;
62 ContainsDynamicAllocas = false;
67 /// CloneBasicBlock - Return a copy of the specified basic block, but without
68 /// embedding the block into a particular function. The block returned is an
69 /// exact copy of the specified basic block, without any remapping having been
70 /// performed. Because of this, this is only suitable for applications where
71 /// the basic block will be inserted into the same function that it was cloned
72 /// from (loop unrolling would use this, for example).
74 /// Also, note that this function makes a direct copy of the basic block, and
75 /// can thus produce illegal LLVM code. In particular, it will copy any PHI
76 /// nodes from the original block, even though there are no predecessors for the
77 /// newly cloned block (thus, phi nodes will have to be updated). Also, this
78 /// block will branch to the old successors of the original block: these
79 /// successors will have to have any PHI nodes updated to account for the new
82 /// The correlation between instructions in the source and result basic blocks
83 /// is recorded in the ValueMap map.
85 /// If you have a particular suffix you'd like to use to add to any cloned
86 /// names, specify it as the optional third parameter.
88 /// If you would like the basic block to be auto-inserted into the end of a
89 /// function, you can specify it as the optional fourth parameter.
91 /// If you would like to collect additional information about the cloned
92 /// function, you can specify a ClonedCodeInfo object with the optional fifth
95 BasicBlock *CloneBasicBlock(const BasicBlock *BB,
96 std::map<const Value*, Value*> &ValueMap,
97 const char *NameSuffix = "", Function *F = 0,
98 ClonedCodeInfo *CodeInfo = 0);
101 /// CloneFunction - Return a copy of the specified function, but without
102 /// embedding the function into another module. Also, any references specified
103 /// in the ValueMap are changed to refer to their mapped value instead of the
104 /// original one. If any of the arguments to the function are in the ValueMap,
105 /// the arguments are deleted from the resultant function. The ValueMap is
106 /// updated to include mappings from all of the instructions and basicblocks in
107 /// the function from their old to new values. The final argument captures
108 /// information about the cloned code if non-null.
110 Function *CloneFunction(const Function *F,
111 std::map<const Value*, Value*> &ValueMap,
112 ClonedCodeInfo *CodeInfo = 0);
114 /// CloneFunction - Version of the function that doesn't need the ValueMap.
116 inline Function *CloneFunction(const Function *F, ClonedCodeInfo *CodeInfo = 0){
117 std::map<const Value*, Value*> ValueMap;
118 return CloneFunction(F, ValueMap, CodeInfo);
121 /// Clone OldFunc into NewFunc, transforming the old arguments into references
122 /// to ArgMap values. Note that if NewFunc already has basic blocks, the ones
123 /// cloned into it will be added to the end of the function. This function
124 /// fills in a list of return instructions, and can optionally append the
125 /// specified suffix to all values cloned.
127 void CloneFunctionInto(Function *NewFunc, const Function *OldFunc,
128 std::map<const Value*, Value*> &ValueMap,
129 std::vector<ReturnInst*> &Returns,
130 const char *NameSuffix = "",
131 ClonedCodeInfo *CodeInfo = 0);
134 /// CloneTraceInto - Clone T into NewFunc. Original<->clone mapping is
135 /// saved in ValueMap.
137 void CloneTraceInto(Function *NewFunc, Trace &T,
138 std::map<const Value*, Value*> &ValueMap,
139 const char *NameSuffix);
141 /// CloneTrace - Returns a copy of the specified trace.
142 /// It takes a vector of basic blocks clones the basic blocks, removes internal
143 /// phi nodes, adds it to the same function as the original (although there is
144 /// no jump to it) and returns the new vector of basic blocks.
145 std::vector<BasicBlock *> CloneTrace(const std::vector<BasicBlock*> &origTrace);
147 /// InlineFunction - This function inlines the called function into the basic
148 /// block of the caller. This returns false if it is not possible to inline
149 /// this call. The program is still in a well defined state if this occurs
152 /// Note that this only does one level of inlining. For example, if the
153 /// instruction 'call B' is inlined, and 'B' calls 'C', then the call to 'C' now
154 /// exists in the instruction stream. Similiarly this will inline a recursive
155 /// function by one level.
157 /// If a non-null callgraph pointer is provided, these functions update the
158 /// CallGraph to represent the program after inlining.
160 bool InlineFunction(CallInst *C, CallGraph *CG = 0);
161 bool InlineFunction(InvokeInst *II, CallGraph *CG = 0);
162 bool InlineFunction(CallSite CS, CallGraph *CG = 0);
164 } // End llvm namespace