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108 lines
4.0 KiB
C++
108 lines
4.0 KiB
C++
//===- ExtractFunction.cpp - Extract a function from Program --------------===//
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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 "Support/CommandLine.h"
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bool DisableSimplifyCFG = false;
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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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cl::opt<bool>
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NoFinalCleanup("disable-final-cleanup",
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cl::desc("Disable the final cleanup phase of narrowing"));
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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(Instruction *I,
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unsigned Simplification) const {
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Module *Result = CloneModule(Program);
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BasicBlock *PBB = I->getParent();
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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(Program->begin(), Module::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::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::iterator(I)));
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I = 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 (I->getType() != Type::VoidTy)
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I->replaceAllUsesWith(Constant::getNullValue(I->getType()));
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// Remove the instruction from the program.
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I->getParent()->getInstList().erase(I);
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// Spiff up the output a little bit.
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PassManager Passes;
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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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/// 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 *InM) const {
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Module *M = InM ? InM : CloneModule(Program);
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// Allow disabling these passes if they crash bugpoint.
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//
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// FIXME: This should eventually run these passes in a pass list to prevent
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// them from being able to crash bugpoint at all!
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//
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if (NoFinalCleanup) return M;
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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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PassManager CleanupPasses;
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CleanupPasses.add(createFunctionResolvingPass());
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CleanupPasses.add(createGlobalDCEPass());
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CleanupPasses.add(createDeadTypeEliminationPass());
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CleanupPasses.add(createDeadArgEliminationPass(InM == 0));
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CleanupPasses.add(createVerifierPass());
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CleanupPasses.run(*M);
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return M;
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}
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