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369 lines
14 KiB
C++
369 lines
14 KiB
C++
//===- ExtractFunction.cpp - Extract a function from Program --------------===//
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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 several methods that are used to extract functions,
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// loops, or portions of a module from the rest of the module.
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//
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//===----------------------------------------------------------------------===//
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#include "BugDriver.h"
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#include "llvm/Constants.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Module.h"
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#include "llvm/PassManager.h"
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#include "llvm/Pass.h"
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#include "llvm/Analysis/Verifier.h"
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#include "llvm/Transforms/IPO.h"
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#include "llvm/Transforms/Scalar.h"
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#include "llvm/Transforms/Utils/Cloning.h"
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#include "llvm/Transforms/Utils/FunctionUtils.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/FileUtilities.h"
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#include <set>
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#include <iostream>
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using namespace llvm;
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namespace llvm {
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bool DisableSimplifyCFG = false;
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} // End llvm namespace
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namespace {
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cl::opt<bool>
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NoDCE ("disable-dce",
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cl::desc("Do not use the -dce pass to reduce testcases"));
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cl::opt<bool, true>
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NoSCFG("disable-simplifycfg", cl::location(DisableSimplifyCFG),
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cl::desc("Do not use the -simplifycfg pass to reduce testcases"));
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}
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/// deleteInstructionFromProgram - This method clones the current Program and
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/// deletes the specified instruction from the cloned module. It then runs a
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/// series of cleanup passes (ADCE and SimplifyCFG) to eliminate any code which
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/// depends on the value. The modified module is then returned.
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///
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Module *BugDriver::deleteInstructionFromProgram(const Instruction *I,
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unsigned Simplification) const {
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Module *Result = CloneModule(Program);
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const BasicBlock *PBB = I->getParent();
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const Function *PF = PBB->getParent();
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Module::iterator RFI = Result->begin(); // Get iterator to corresponding fn
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std::advance(RFI, std::distance(PF->getParent()->begin(),
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Module::const_iterator(PF)));
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Function::iterator RBI = RFI->begin(); // Get iterator to corresponding BB
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std::advance(RBI, std::distance(PF->begin(), Function::const_iterator(PBB)));
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BasicBlock::iterator RI = RBI->begin(); // Get iterator to corresponding inst
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std::advance(RI, std::distance(PBB->begin(), BasicBlock::const_iterator(I)));
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Instruction *TheInst = RI; // Got the corresponding instruction!
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// If this instruction produces a value, replace any users with null values
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if (TheInst->getType() != Type::VoidTy)
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TheInst->replaceAllUsesWith(Constant::getNullValue(TheInst->getType()));
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// Remove the instruction from the program.
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TheInst->getParent()->getInstList().erase(TheInst);
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//writeProgramToFile("current.bc", Result);
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// Spiff up the output a little bit.
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PassManager Passes;
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// Make sure that the appropriate target data is always used...
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Passes.add(new TargetData(Result));
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/// FIXME: If this used runPasses() like the methods below, we could get rid
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/// of the -disable-* options!
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if (Simplification > 1 && !NoDCE)
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Passes.add(createDeadCodeEliminationPass());
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if (Simplification && !DisableSimplifyCFG)
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Passes.add(createCFGSimplificationPass()); // Delete dead control flow
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Passes.add(createVerifierPass());
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Passes.run(*Result);
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return Result;
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}
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static const PassInfo *getPI(Pass *P) {
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const PassInfo *PI = P->getPassInfo();
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delete P;
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return PI;
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}
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/// performFinalCleanups - This method clones the current Program and performs
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/// a series of cleanups intended to get rid of extra cruft on the module
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/// before handing it to the user.
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///
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Module *BugDriver::performFinalCleanups(Module *M, bool MayModifySemantics) {
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// Make all functions external, so GlobalDCE doesn't delete them...
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for (Module::iterator I = M->begin(), E = M->end(); I != E; ++I)
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I->setLinkage(GlobalValue::ExternalLinkage);
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std::vector<const PassInfo*> CleanupPasses;
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CleanupPasses.push_back(getPI(createGlobalDCEPass()));
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CleanupPasses.push_back(getPI(createDeadTypeEliminationPass()));
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if (MayModifySemantics)
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CleanupPasses.push_back(getPI(createDeadArgHackingPass()));
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else
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CleanupPasses.push_back(getPI(createDeadArgEliminationPass()));
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Module *New = runPassesOn(M, CleanupPasses);
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if (New == 0) {
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std::cerr << "Final cleanups failed. Sorry. :( Please report a bug!\n";
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return M;
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}
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delete M;
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return New;
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}
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/// ExtractLoop - Given a module, extract up to one loop from it into a new
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/// function. This returns null if there are no extractable loops in the
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/// program or if the loop extractor crashes.
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Module *BugDriver::ExtractLoop(Module *M) {
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std::vector<const PassInfo*> LoopExtractPasses;
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LoopExtractPasses.push_back(getPI(createSingleLoopExtractorPass()));
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Module *NewM = runPassesOn(M, LoopExtractPasses);
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if (NewM == 0) {
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Module *Old = swapProgramIn(M);
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std::cout << "*** Loop extraction failed: ";
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EmitProgressBitcode("loopextraction", true);
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std::cout << "*** Sorry. :( Please report a bug!\n";
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swapProgramIn(Old);
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return 0;
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}
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// Check to see if we created any new functions. If not, no loops were
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// extracted and we should return null. Limit the number of loops we extract
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// to avoid taking forever.
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static unsigned NumExtracted = 32;
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if (M->size() == NewM->size() || --NumExtracted == 0) {
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delete NewM;
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return 0;
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} else {
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assert(M->size() < NewM->size() && "Loop extract removed functions?");
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Module::iterator MI = NewM->begin();
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for (unsigned i = 0, e = M->size(); i != e; ++i)
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++MI;
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}
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return NewM;
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}
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// DeleteFunctionBody - "Remove" the function by deleting all of its basic
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// blocks, making it external.
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//
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void llvm::DeleteFunctionBody(Function *F) {
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// delete the body of the function...
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F->deleteBody();
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assert(F->isDeclaration() && "This didn't make the function external!");
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}
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/// GetTorInit - Given a list of entries for static ctors/dtors, return them
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/// as a constant array.
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static Constant *GetTorInit(std::vector<std::pair<Function*, int> > &TorList) {
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assert(!TorList.empty() && "Don't create empty tor list!");
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std::vector<Constant*> ArrayElts;
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for (unsigned i = 0, e = TorList.size(); i != e; ++i) {
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std::vector<Constant*> Elts;
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Elts.push_back(ConstantInt::get(Type::Int32Ty, TorList[i].second));
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Elts.push_back(TorList[i].first);
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ArrayElts.push_back(ConstantStruct::get(Elts));
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}
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return ConstantArray::get(ArrayType::get(ArrayElts[0]->getType(),
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ArrayElts.size()),
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ArrayElts);
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}
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/// SplitStaticCtorDtor - A module was recently split into two parts, M1/M2, and
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/// M1 has all of the global variables. If M2 contains any functions that are
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/// static ctors/dtors, we need to add an llvm.global_[cd]tors global to M2, and
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/// prune appropriate entries out of M1s list.
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static void SplitStaticCtorDtor(const char *GlobalName, Module *M1, Module *M2){
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GlobalVariable *GV = M1->getNamedGlobal(GlobalName);
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if (!GV || GV->isDeclaration() || GV->hasInternalLinkage() ||
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!GV->use_empty()) return;
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std::vector<std::pair<Function*, int> > M1Tors, M2Tors;
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ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
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if (!InitList) return;
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for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
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if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
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if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
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if (CS->getOperand(1)->isNullValue())
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break; // Found a null terminator, stop here.
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ConstantInt *CI = dyn_cast<ConstantInt>(CS->getOperand(0));
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int Priority = CI ? CI->getSExtValue() : 0;
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Constant *FP = CS->getOperand(1);
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if (ConstantExpr *CE = dyn_cast<ConstantExpr>(FP))
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if (CE->isCast())
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FP = CE->getOperand(0);
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if (Function *F = dyn_cast<Function>(FP)) {
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if (!F->isDeclaration())
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M1Tors.push_back(std::make_pair(F, Priority));
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else {
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// Map to M2's version of the function.
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F = M2->getFunction(F->getName());
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M2Tors.push_back(std::make_pair(F, Priority));
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}
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}
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}
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}
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GV->eraseFromParent();
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if (!M1Tors.empty()) {
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Constant *M1Init = GetTorInit(M1Tors);
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new GlobalVariable(M1Init->getType(), false, GlobalValue::AppendingLinkage,
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M1Init, GlobalName, M1);
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}
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GV = M2->getNamedGlobal(GlobalName);
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assert(GV && "Not a clone of M1?");
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assert(GV->use_empty() && "llvm.ctors shouldn't have uses!");
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GV->eraseFromParent();
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if (!M2Tors.empty()) {
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Constant *M2Init = GetTorInit(M2Tors);
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new GlobalVariable(M2Init->getType(), false, GlobalValue::AppendingLinkage,
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M2Init, GlobalName, M2);
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}
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}
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/// SplitFunctionsOutOfModule - Given a module and a list of functions in the
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/// module, split the functions OUT of the specified module, and place them in
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/// the new module.
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Module *llvm::SplitFunctionsOutOfModule(Module *M,
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const std::vector<Function*> &F) {
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// Make sure functions & globals are all external so that linkage
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// between the two modules will work.
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for (Module::iterator I = M->begin(), E = M->end(); I != E; ++I)
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I->setLinkage(GlobalValue::ExternalLinkage);
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for (Module::global_iterator I = M->global_begin(), E = M->global_end();
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I != E; ++I)
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I->setLinkage(GlobalValue::ExternalLinkage);
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Module *New = CloneModule(M);
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// Make sure global initializers exist only in the safe module (CBE->.so)
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for (Module::global_iterator I = New->global_begin(), E = New->global_end();
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I != E; ++I)
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I->setInitializer(0); // Delete the initializer to make it external
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// Remove the Test functions from the Safe module
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std::set<std::pair<std::string, const PointerType*> > TestFunctions;
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for (unsigned i = 0, e = F.size(); i != e; ++i) {
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TestFunctions.insert(std::make_pair(F[i]->getName(), F[i]->getType()));
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Function *TNOF = M->getFunction(F[i]->getName());
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assert(TNOF && "Function doesn't exist in module!");
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assert(TNOF->getFunctionType() == F[i]->getFunctionType() && "wrong type?");
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DEBUG(std::cerr << "Removing function " << F[i]->getName() << "\n");
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DeleteFunctionBody(TNOF); // Function is now external in this module!
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}
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// Remove the Safe functions from the Test module
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for (Module::iterator I = New->begin(), E = New->end(); I != E; ++I)
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if (!TestFunctions.count(std::make_pair(I->getName(), I->getType())))
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DeleteFunctionBody(I);
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// Make sure that there is a global ctor/dtor array in both halves of the
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// module if they both have static ctor/dtor functions.
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SplitStaticCtorDtor("llvm.global_ctors", M, New);
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SplitStaticCtorDtor("llvm.global_dtors", M, New);
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return New;
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}
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//===----------------------------------------------------------------------===//
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// Basic Block Extraction Code
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//===----------------------------------------------------------------------===//
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namespace {
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std::vector<BasicBlock*> BlocksToNotExtract;
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/// BlockExtractorPass - This pass is used by bugpoint to extract all blocks
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/// from the module into their own functions except for those specified by the
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/// BlocksToNotExtract list.
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class BlockExtractorPass : public ModulePass {
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bool runOnModule(Module &M);
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public:
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static char ID; // Pass ID, replacement for typeid
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BlockExtractorPass() : ModulePass((intptr_t)&ID) {}
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};
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char BlockExtractorPass::ID = 0;
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RegisterPass<BlockExtractorPass>
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XX("extract-bbs", "Extract Basic Blocks From Module (for bugpoint use)");
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}
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bool BlockExtractorPass::runOnModule(Module &M) {
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std::set<BasicBlock*> TranslatedBlocksToNotExtract;
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for (unsigned i = 0, e = BlocksToNotExtract.size(); i != e; ++i) {
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BasicBlock *BB = BlocksToNotExtract[i];
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Function *F = BB->getParent();
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// Map the corresponding function in this module.
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Function *MF = M.getFunction(F->getName());
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// Figure out which index the basic block is in its function.
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Function::iterator BBI = MF->begin();
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std::advance(BBI, std::distance(F->begin(), Function::iterator(BB)));
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TranslatedBlocksToNotExtract.insert(BBI);
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}
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// Now that we know which blocks to not extract, figure out which ones we WANT
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// to extract.
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std::vector<BasicBlock*> BlocksToExtract;
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for (Module::iterator F = M.begin(), E = M.end(); F != E; ++F)
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for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB)
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if (!TranslatedBlocksToNotExtract.count(BB))
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BlocksToExtract.push_back(BB);
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for (unsigned i = 0, e = BlocksToExtract.size(); i != e; ++i)
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ExtractBasicBlock(BlocksToExtract[i]);
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return !BlocksToExtract.empty();
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}
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/// ExtractMappedBlocksFromModule - Extract all but the specified basic blocks
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/// into their own functions. The only detail is that M is actually a module
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/// cloned from the one the BBs are in, so some mapping needs to be performed.
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/// If this operation fails for some reason (ie the implementation is buggy),
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/// this function should return null, otherwise it returns a new Module.
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Module *BugDriver::ExtractMappedBlocksFromModule(const
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std::vector<BasicBlock*> &BBs,
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Module *M) {
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// Set the global list so that pass will be able to access it.
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BlocksToNotExtract = BBs;
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std::vector<const PassInfo*> PI;
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PI.push_back(getPI(new BlockExtractorPass()));
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Module *Ret = runPassesOn(M, PI);
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BlocksToNotExtract.clear();
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if (Ret == 0) {
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std::cout << "*** Basic Block extraction failed, please report a bug!\n";
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M = swapProgramIn(M);
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EmitProgressBitcode("basicblockextractfail", true);
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swapProgramIn(M);
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}
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return Ret;
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}
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