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191 lines
8.1 KiB
C++
191 lines
8.1 KiB
C++
//===- Cloning.h - Clone various parts of LLVM programs ---------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines various functions that are used to clone chunks of LLVM
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// code for various purposes. This varies from copying whole modules into new
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// modules, to cloning functions with different arguments, to inlining
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// functions, to copying basic blocks to support loop unrolling or superblock
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// formation, etc.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TRANSFORMS_UTILS_CLONING_H
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#define LLVM_TRANSFORMS_UTILS_CLONING_H
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#include <vector>
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#include "llvm/ADT/DenseMap.h"
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namespace llvm {
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class Module;
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class Function;
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class Loop;
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class LoopInfo;
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class Pass;
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class LPPassManager;
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class BasicBlock;
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class Value;
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class CallInst;
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class InvokeInst;
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class ReturnInst;
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class CallSite;
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class Trace;
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class CallGraph;
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class TargetData;
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/// CloneModule - Return an exact copy of the specified module
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///
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Module *CloneModule(const Module *M);
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Module *CloneModule(const Module *M, DenseMap<const Value*, Value*> &ValueMap);
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/// ClonedCodeInfo - This struct can be used to capture information about code
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/// being cloned, while it is being cloned.
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struct ClonedCodeInfo {
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/// ContainsCalls - This is set to true if the cloned code contains a normal
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/// call instruction.
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bool ContainsCalls;
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/// ContainsUnwinds - This is set to true if the cloned code contains an
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/// unwind instruction.
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bool ContainsUnwinds;
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/// ContainsDynamicAllocas - This is set to true if the cloned code contains
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/// a 'dynamic' alloca. Dynamic allocas are allocas that are either not in
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/// the entry block or they are in the entry block but are not a constant
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/// size.
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bool ContainsDynamicAllocas;
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ClonedCodeInfo() {
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ContainsCalls = false;
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ContainsUnwinds = false;
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ContainsDynamicAllocas = false;
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}
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};
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/// CloneBasicBlock - Return a copy of the specified basic block, but without
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/// embedding the block into a particular function. The block returned is an
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/// exact copy of the specified basic block, without any remapping having been
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/// performed. Because of this, this is only suitable for applications where
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/// the basic block will be inserted into the same function that it was cloned
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/// from (loop unrolling would use this, for example).
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///
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/// Also, note that this function makes a direct copy of the basic block, and
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/// can thus produce illegal LLVM code. In particular, it will copy any PHI
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/// nodes from the original block, even though there are no predecessors for the
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/// newly cloned block (thus, phi nodes will have to be updated). Also, this
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/// block will branch to the old successors of the original block: these
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/// successors will have to have any PHI nodes updated to account for the new
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/// incoming edges.
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///
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/// The correlation between instructions in the source and result basic blocks
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/// is recorded in the ValueMap map.
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///
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/// If you have a particular suffix you'd like to use to add to any cloned
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/// names, specify it as the optional third parameter.
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///
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/// If you would like the basic block to be auto-inserted into the end of a
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/// function, you can specify it as the optional fourth parameter.
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///
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/// If you would like to collect additional information about the cloned
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/// function, you can specify a ClonedCodeInfo object with the optional fifth
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/// parameter.
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///
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BasicBlock *CloneBasicBlock(const BasicBlock *BB,
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DenseMap<const Value*, Value*> &ValueMap,
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const char *NameSuffix = "", Function *F = 0,
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ClonedCodeInfo *CodeInfo = 0);
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/// CloneLoop - Clone Loop. Clone dominator info for loop insiders. Populate ValueMap
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/// using old blocks to new blocks mapping.
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Loop *CloneLoop(Loop *L, LPPassManager *LPM, LoopInfo *LI,
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DenseMap<const Value *, Value *> &ValueMap, Pass *P);
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/// CloneFunction - Return a copy of the specified function, but without
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/// embedding the function into another module. Also, any references specified
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/// in the ValueMap are changed to refer to their mapped value instead of the
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/// original one. If any of the arguments to the function are in the ValueMap,
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/// the arguments are deleted from the resultant function. The ValueMap is
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/// updated to include mappings from all of the instructions and basicblocks in
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/// the function from their old to new values. The final argument captures
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/// information about the cloned code if non-null.
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///
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Function *CloneFunction(const Function *F,
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DenseMap<const Value*, Value*> &ValueMap,
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ClonedCodeInfo *CodeInfo = 0);
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/// CloneFunction - Version of the function that doesn't need the ValueMap.
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///
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inline Function *CloneFunction(const Function *F, ClonedCodeInfo *CodeInfo = 0){
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DenseMap<const Value*, Value*> ValueMap;
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return CloneFunction(F, ValueMap, CodeInfo);
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}
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/// Clone OldFunc into NewFunc, transforming the old arguments into references
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/// to ArgMap values. Note that if NewFunc already has basic blocks, the ones
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/// cloned into it will be added to the end of the function. This function
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/// fills in a list of return instructions, and can optionally append the
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/// specified suffix to all values cloned.
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///
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void CloneFunctionInto(Function *NewFunc, const Function *OldFunc,
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DenseMap<const Value*, Value*> &ValueMap,
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std::vector<ReturnInst*> &Returns,
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const char *NameSuffix = "",
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ClonedCodeInfo *CodeInfo = 0);
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/// CloneAndPruneFunctionInto - This works exactly like CloneFunctionInto,
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/// except that it does some simple constant prop and DCE on the fly. The
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/// effect of this is to copy significantly less code in cases where (for
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/// example) a function call with constant arguments is inlined, and those
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/// constant arguments cause a significant amount of code in the callee to be
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/// dead. Since this doesn't produce an exactly copy of the input, it can't be
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/// used for things like CloneFunction or CloneModule.
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void CloneAndPruneFunctionInto(Function *NewFunc, const Function *OldFunc,
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DenseMap<const Value*, Value*> &ValueMap,
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std::vector<ReturnInst*> &Returns,
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const char *NameSuffix = "",
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ClonedCodeInfo *CodeInfo = 0,
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const TargetData *TD = 0);
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/// CloneTraceInto - Clone T into NewFunc. Original<->clone mapping is
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/// saved in ValueMap.
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///
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void CloneTraceInto(Function *NewFunc, Trace &T,
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DenseMap<const Value*, Value*> &ValueMap,
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const char *NameSuffix);
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/// CloneTrace - Returns a copy of the specified trace.
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/// It takes a vector of basic blocks clones the basic blocks, removes internal
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/// phi nodes, adds it to the same function as the original (although there is
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/// no jump to it) and returns the new vector of basic blocks.
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std::vector<BasicBlock *> CloneTrace(const std::vector<BasicBlock*> &origTrace);
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/// InlineFunction - This function inlines the called function into the basic
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/// block of the caller. This returns false if it is not possible to inline
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/// this call. The program is still in a well defined state if this occurs
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/// though.
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///
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/// Note that this only does one level of inlining. For example, if the
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/// instruction 'call B' is inlined, and 'B' calls 'C', then the call to 'C' now
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/// exists in the instruction stream. Similiarly this will inline a recursive
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/// function by one level.
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///
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/// If a non-null callgraph pointer is provided, these functions update the
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/// CallGraph to represent the program after inlining.
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///
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bool InlineFunction(CallInst *C, CallGraph *CG = 0, const TargetData *TD = 0);
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bool InlineFunction(InvokeInst *II, CallGraph *CG = 0, const TargetData *TD =0);
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bool InlineFunction(CallSite CS, CallGraph *CG = 0, const TargetData *TD = 0);
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} // End llvm namespace
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#endif
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