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17d145d26f
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5806 91177308-0d34-0410-b5e6-96231b3b80d8
136 lines
5.5 KiB
C++
136 lines
5.5 KiB
C++
//===- CloneFunction.cpp - Clone a function into another function ---------===//
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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/iTerminators.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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// RemapInstruction - Convert the instruction operands from referencing the
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// current values into those specified by ValueMap.
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//
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static inline void RemapInstruction(Instruction *I,
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std::map<const Value *, Value*> &ValueMap) {
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for (unsigned op = 0, E = I->getNumOperands(); op != E; ++op) {
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const Value *Op = I->getOperand(op);
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Value *V = MapValue(Op, ValueMap);
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#ifndef NDEBUG
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if (!V) {
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std::cerr << "Val = \n" << Op << "Addr = " << (void*)Op;
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std::cerr << "\nInst = " << I;
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}
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#endif
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assert(V && "Referenced value not in value map!");
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I->setOperand(op, V);
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}
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}
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// CloneBasicBlock - See comments in Cloning.h
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BasicBlock *CloneBasicBlock(const BasicBlock *BB,
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std::map<const Value*, Value*> &ValueMap,
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const char *NameSuffix) {
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BasicBlock *NewBB = new BasicBlock("");
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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 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);
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NewFunc->getBasicBlockList().push_back(CBB);
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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::const_iterator BB = OldFunc->begin(), BE = OldFunc->end();
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BB != BE; ++BB) {
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BasicBlock *NBB = cast<BasicBlock>(ValueMap[BB]);
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// Loop over all instructions, fixing each one as we find it...
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for (BasicBlock::iterator II = NBB->begin(); II != NBB->end(); ++II)
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RemapInstruction(II, ValueMap);
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}
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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 *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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