| //===- CloneFunction.cpp - Clone a function into another function ---------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file was developed by the LLVM research group and is distributed under |
| // the University of Illinois Open Source License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file implements the CloneFunctionInto interface, which is used as the |
| // low-level function cloner. This is used by the CloneFunction and function |
| // inliner to do the dirty work of copying the body of a function around. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "llvm/Transforms/Utils/Cloning.h" |
| #include "llvm/iTerminators.h" |
| #include "llvm/DerivedTypes.h" |
| #include "llvm/Function.h" |
| #include "ValueMapper.h" |
| |
| // RemapInstruction - Convert the instruction operands from referencing the |
| // current values into those specified by ValueMap. |
| // |
| static inline void RemapInstruction(Instruction *I, |
| std::map<const Value *, Value*> &ValueMap) { |
| for (unsigned op = 0, E = I->getNumOperands(); op != E; ++op) { |
| const Value *Op = I->getOperand(op); |
| Value *V = MapValue(Op, ValueMap); |
| #ifndef NDEBUG |
| if (!V) { |
| std::cerr << "Val = \n" << Op << "Addr = " << (void*)Op; |
| std::cerr << "\nInst = " << I; |
| } |
| #endif |
| assert(V && "Referenced value not in value map!"); |
| I->setOperand(op, V); |
| } |
| } |
| |
| // CloneBasicBlock - See comments in Cloning.h |
| BasicBlock *CloneBasicBlock(const BasicBlock *BB, |
| std::map<const Value*, Value*> &ValueMap, |
| const char *NameSuffix) { |
| BasicBlock *NewBB = new BasicBlock(""); |
| if (BB->hasName()) NewBB->setName(BB->getName()+NameSuffix); |
| |
| // Loop over all instructions copying them over... |
| for (BasicBlock::const_iterator II = BB->begin(), IE = BB->end(); |
| II != IE; ++II) { |
| Instruction *NewInst = II->clone(); |
| if (II->hasName()) |
| NewInst->setName(II->getName()+NameSuffix); |
| NewBB->getInstList().push_back(NewInst); |
| ValueMap[II] = NewInst; // Add instruction map to value. |
| } |
| return NewBB; |
| } |
| |
| // Clone OldFunc into NewFunc, transforming the old arguments into references to |
| // ArgMap values. |
| // |
| void CloneFunctionInto(Function *NewFunc, const Function *OldFunc, |
| std::map<const Value*, Value*> &ValueMap, |
| std::vector<ReturnInst*> &Returns, |
| const char *NameSuffix) { |
| assert(NameSuffix && "NameSuffix cannot be null!"); |
| |
| #ifndef NDEBUG |
| for (Function::const_aiterator I = OldFunc->abegin(), E = OldFunc->aend(); |
| I != E; ++I) |
| assert(ValueMap.count(I) && "No mapping from source argument specified!"); |
| #endif |
| |
| // Loop over all of the basic blocks in the function, cloning them as |
| // appropriate. Note that we save BE this way in order to handle cloning of |
| // recursive functions into themselves. |
| // |
| for (Function::const_iterator BI = OldFunc->begin(), BE = OldFunc->end(); |
| BI != BE; ++BI) { |
| const BasicBlock &BB = *BI; |
| |
| // Create a new basic block and copy instructions into it! |
| BasicBlock *CBB = CloneBasicBlock(&BB, ValueMap, NameSuffix); |
| NewFunc->getBasicBlockList().push_back(CBB); |
| ValueMap[&BB] = CBB; // Add basic block mapping. |
| |
| if (ReturnInst *RI = dyn_cast<ReturnInst>(CBB->getTerminator())) |
| Returns.push_back(RI); |
| } |
| |
| // Loop over all of the instructions in the function, fixing up operand |
| // references as we go. This uses ValueMap to do all the hard work. |
| // |
| for (Function::const_iterator BB = OldFunc->begin(), BE = OldFunc->end(); |
| BB != BE; ++BB) { |
| BasicBlock *NBB = cast<BasicBlock>(ValueMap[BB]); |
| |
| // Loop over all instructions, fixing each one as we find it... |
| for (BasicBlock::iterator II = NBB->begin(); II != NBB->end(); ++II) |
| RemapInstruction(II, ValueMap); |
| } |
| } |
| |
| /// CloneFunction - Return a copy of the specified function, but without |
| /// embedding the function into another module. Also, any references specified |
| /// in the ValueMap are changed to refer to their mapped value instead of the |
| /// original one. If any of the arguments to the function are in the ValueMap, |
| /// the arguments are deleted from the resultant function. The ValueMap is |
| /// updated to include mappings from all of the instructions and basicblocks in |
| /// the function from their old to new values. |
| /// |
| Function *CloneFunction(const Function *F, |
| std::map<const Value*, Value*> &ValueMap) { |
| std::vector<const Type*> ArgTypes; |
| |
| // The user might be deleting arguments to the function by specifying them in |
| // the ValueMap. If so, we need to not add the arguments to the arg ty vector |
| // |
| for (Function::const_aiterator I = F->abegin(), E = F->aend(); I != E; ++I) |
| if (ValueMap.count(I) == 0) // Haven't mapped the argument to anything yet? |
| ArgTypes.push_back(I->getType()); |
| |
| // Create a new function type... |
| FunctionType *FTy = FunctionType::get(F->getFunctionType()->getReturnType(), |
| ArgTypes, F->getFunctionType()->isVarArg()); |
| |
| // Create the new function... |
| Function *NewF = new Function(FTy, F->getLinkage(), F->getName()); |
| |
| // Loop over the arguments, copying the names of the mapped arguments over... |
| Function::aiterator DestI = NewF->abegin(); |
| for (Function::const_aiterator I = F->abegin(), E = F->aend(); I != E; ++I) |
| if (ValueMap.count(I) == 0) { // Is this argument preserved? |
| DestI->setName(I->getName()); // Copy the name over... |
| ValueMap[I] = DestI++; // Add mapping to ValueMap |
| } |
| |
| std::vector<ReturnInst*> Returns; // Ignore returns cloned... |
| CloneFunctionInto(NewF, F, ValueMap, Returns); |
| return NewF; |
| } |