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91 lines
3.2 KiB
C++
91 lines
3.2 KiB
C++
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// FIXME: document
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#include "llvm/Transforms/Utils/CloneFunction.h"
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#include "llvm/Function.h"
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#include "llvm/BasicBlock.h"
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#include "llvm/Instruction.h"
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#include <map>
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// FIXME: This should be merged with FunctionInlining
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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 = ValueMap[Op];
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if (!V && (isa<GlobalValue>(Op) || isa<Constant>(Op)))
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continue; // Globals and constants don't get relocated
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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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// 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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const std::vector<Value*> &ArgMap) {
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assert(OldFunc->aempty() || !NewFunc->aempty() &&
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"Synthesization of arguments is not implemented yet!");
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assert(OldFunc->asize() == ArgMap.size() &&
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"Improper number of argument values to map specified!");
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// Keep a mapping between the original function's values and the new
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// duplicated code's values. This includes all of: Function arguments,
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// instruction values, constant pool entries, and basic blocks.
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//
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std::map<const Value *, Value*> ValueMap;
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// Add all of the function arguments to the mapping...
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unsigned i = 0;
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for (Function::const_aiterator I = OldFunc->abegin(), E = OldFunc->aend();
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I != E; ++I, ++i)
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ValueMap[I] = ArgMap[i];
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// Loop over all of the basic blocks in the function, cloning them as
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// appropriate.
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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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assert(BB.getTerminator() && "BasicBlock doesn't have terminator!?!?");
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// Create a new basic block to copy instructions into!
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BasicBlock *CBB = new BasicBlock(BB.getName(), NewFunc);
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ValueMap[&BB] = CBB; // Add basic block mapping.
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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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NewInst->setName(II->getName()); // Name is not cloned...
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CBB->getInstList().push_back(NewInst);
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ValueMap[II] = NewInst; // Add instruction map to value.
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}
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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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