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0cc8807029
deleteInstructionFromProgram be const git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11606 91177308-0d34-0410-b5e6-96231b3b80d8
138 lines
4.9 KiB
C++
138 lines
4.9 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 a method that extracts a function from program, cleans
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// it up, and returns it as a new module.
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//
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//===----------------------------------------------------------------------===//
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#include "BugDriver.h"
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#include "llvm/Constant.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/Type.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/Target/TargetData.h"
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#include "Support/CommandLine.h"
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#include "Support/FileUtilities.h"
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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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NoADCE("disable-adce",
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cl::desc("Do not use the -adce pass to reduce testcases"));
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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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// 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("bugpoint", Result));
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if (Simplification > 2 && !NoADCE)
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Passes.add(createAggressiveDCEPass()); // Remove dead code...
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//Passes.add(createInstructionCombiningPass());
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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(createFunctionResolvingPass()));
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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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std::swap(Program, M);
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std::string Filename;
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bool Failed = runPasses(CleanupPasses, Filename);
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std::swap(Program, M);
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if (Failed) {
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std::cerr << "Final cleanups failed. Sorry. :(\n";
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} else {
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delete M;
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M = ParseInputFile(Filename);
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if (M == 0) {
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std::cerr << getToolName() << ": Error reading bytecode file '"
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<< Filename << "'!\n";
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exit(1);
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}
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removeFile(Filename);
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}
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return M;
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}
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