forked from OSchip/llvm-project
122 lines
5.2 KiB
C++
122 lines
5.2 KiB
C++
//===- CloneFunction.cpp - Clone a function into another function ---------===//
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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 implements the CloneFunctionInto interface, which is used as the
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// low-level function cloner. This is used by the CloneFunction and function
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// inliner to do the dirty work of copying the body of a function around.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Transforms/Utils/Cloning.h"
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#include "llvm/Instructions.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Function.h"
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#include "ValueMapper.h"
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using namespace llvm;
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// CloneBasicBlock - See comments in Cloning.h
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BasicBlock *llvm::CloneBasicBlock(const BasicBlock *BB,
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std::map<const Value*, Value*> &ValueMap,
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const char *NameSuffix, Function *F) {
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BasicBlock *NewBB = new BasicBlock("", F);
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if (BB->hasName()) NewBB->setName(BB->getName()+NameSuffix);
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// Loop over all instructions copying them over...
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for (BasicBlock::const_iterator II = BB->begin(), IE = BB->end();
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II != IE; ++II) {
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Instruction *NewInst = II->clone();
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if (II->hasName())
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NewInst->setName(II->getName()+NameSuffix);
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NewBB->getInstList().push_back(NewInst);
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ValueMap[II] = NewInst; // Add instruction map to value.
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}
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return NewBB;
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}
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// Clone OldFunc into NewFunc, transforming the old arguments into references to
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// ArgMap values.
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//
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void llvm::CloneFunctionInto(Function *NewFunc, const Function *OldFunc,
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std::map<const Value*, Value*> &ValueMap,
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std::vector<ReturnInst*> &Returns,
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const char *NameSuffix) {
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assert(NameSuffix && "NameSuffix cannot be null!");
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#ifndef NDEBUG
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for (Function::const_aiterator I = OldFunc->abegin(), E = OldFunc->aend();
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I != E; ++I)
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assert(ValueMap.count(I) && "No mapping from source argument specified!");
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#endif
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// Loop over all of the basic blocks in the function, cloning them as
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// appropriate. Note that we save BE this way in order to handle cloning of
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// recursive functions into themselves.
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//
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for (Function::const_iterator BI = OldFunc->begin(), BE = OldFunc->end();
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BI != BE; ++BI) {
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const BasicBlock &BB = *BI;
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// Create a new basic block and copy instructions into it!
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BasicBlock *CBB = CloneBasicBlock(&BB, ValueMap, NameSuffix, NewFunc);
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ValueMap[&BB] = CBB; // Add basic block mapping.
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if (ReturnInst *RI = dyn_cast<ReturnInst>(CBB->getTerminator()))
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Returns.push_back(RI);
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}
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// Loop over all of the instructions in the function, fixing up operand
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// references as we go. This uses ValueMap to do all the hard work.
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//
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for (Function::iterator BB = cast<BasicBlock>(ValueMap[OldFunc->begin()]),
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BE = NewFunc->end(); BB != BE; ++BB)
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// Loop over all instructions, fixing each one as we find it...
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for (BasicBlock::iterator II = BB->begin(); II != BB->end(); ++II)
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RemapInstruction(II, ValueMap);
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}
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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.
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///
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Function *llvm::CloneFunction(const Function *F,
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std::map<const Value*, Value*> &ValueMap) {
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std::vector<const Type*> ArgTypes;
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// The user might be deleting arguments to the function by specifying them in
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// the ValueMap. If so, we need to not add the arguments to the arg ty vector
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//
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for (Function::const_aiterator I = F->abegin(), E = F->aend(); I != E; ++I)
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if (ValueMap.count(I) == 0) // Haven't mapped the argument to anything yet?
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ArgTypes.push_back(I->getType());
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// Create a new function type...
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FunctionType *FTy = FunctionType::get(F->getFunctionType()->getReturnType(),
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ArgTypes, F->getFunctionType()->isVarArg());
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// Create the new function...
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Function *NewF = new Function(FTy, F->getLinkage(), F->getName());
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// Loop over the arguments, copying the names of the mapped arguments over...
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Function::aiterator DestI = NewF->abegin();
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for (Function::const_aiterator I = F->abegin(), E = F->aend(); I != E; ++I)
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if (ValueMap.count(I) == 0) { // Is this argument preserved?
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DestI->setName(I->getName()); // Copy the name over...
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ValueMap[I] = DestI++; // Add mapping to ValueMap
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}
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std::vector<ReturnInst*> Returns; // Ignore returns cloned...
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CloneFunctionInto(NewF, F, ValueMap, Returns);
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return NewF;
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}
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