//===- ExtractFunction.cpp - Extract a function from Program --------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
//
// This file implements a method that extracts a function from program, cleans
// it up, and returns it as a new module.
//===----------------------------------------------------------------------===//
#include "BugDriver.h"
+#include "llvm/Constant.h"
#include "llvm/Module.h"
#include "llvm/PassManager.h"
+#include "llvm/Pass.h"
+#include "llvm/Type.h"
+#include "llvm/Analysis/Verifier.h"
#include "llvm/Transforms/IPO.h"
#include "llvm/Transforms/Scalar.h"
#include "llvm/Transforms/Utils/Cloning.h"
-#include "llvm/Analysis/Verifier.h"
-#include "llvm/Type.h"
-#include "llvm/Constant.h"
+#include "llvm/Target/TargetData.h"
#include "Support/CommandLine.h"
+#include "Support/Debug.h"
+#include "Support/FileUtilities.h"
+using namespace llvm;
+
+namespace llvm {
+ bool DisableSimplifyCFG = false;
+} // End llvm namespace
namespace {
cl::opt<bool>
- NoADCE("disable-adce",
- cl::desc("Do not use the -adce pass to reduce testcases"));
- cl::opt<bool>
NoDCE ("disable-dce",
cl::desc("Do not use the -dce pass to reduce testcases"));
- cl::opt<bool>
- NoSCFG("disable-simplifycfg",
+ cl::opt<bool, true>
+ NoSCFG("disable-simplifycfg", cl::location(DisableSimplifyCFG),
cl::desc("Do not use the -simplifycfg pass to reduce testcases"));
}
/// series of cleanup passes (ADCE and SimplifyCFG) to eliminate any code which
/// depends on the value. The modified module is then returned.
///
-Module *BugDriver::deleteInstructionFromProgram(Instruction *I,
+Module *BugDriver::deleteInstructionFromProgram(const Instruction *I,
unsigned Simplification) const {
Module *Result = CloneModule(Program);
- BasicBlock *PBB = I->getParent();
- Function *PF = PBB->getParent();
+ const BasicBlock *PBB = I->getParent();
+ const Function *PF = PBB->getParent();
Module::iterator RFI = Result->begin(); // Get iterator to corresponding fn
- std::advance(RFI, std::distance(Program->begin(), Module::iterator(PF)));
+ std::advance(RFI, std::distance(PF->getParent()->begin(),
+ Module::const_iterator(PF)));
Function::iterator RBI = RFI->begin(); // Get iterator to corresponding BB
- std::advance(RBI, std::distance(PF->begin(), Function::iterator(PBB)));
+ std::advance(RBI, std::distance(PF->begin(), Function::const_iterator(PBB)));
BasicBlock::iterator RI = RBI->begin(); // Get iterator to corresponding inst
- std::advance(RI, std::distance(PBB->begin(), BasicBlock::iterator(I)));
- I = RI; // Got the corresponding instruction!
+ std::advance(RI, std::distance(PBB->begin(), BasicBlock::const_iterator(I)));
+ Instruction *TheInst = RI; // Got the corresponding instruction!
// If this instruction produces a value, replace any users with null values
- if (I->getType() != Type::VoidTy)
- I->replaceAllUsesWith(Constant::getNullValue(I->getType()));
+ if (TheInst->getType() != Type::VoidTy)
+ TheInst->replaceAllUsesWith(Constant::getNullValue(TheInst->getType()));
// Remove the instruction from the program.
- I->getParent()->getInstList().erase(I);
+ TheInst->getParent()->getInstList().erase(TheInst);
// Spiff up the output a little bit.
PassManager Passes;
- if (Simplification > 2 && !NoADCE)
- Passes.add(createAggressiveDCEPass()); // Remove dead code...
- //Passes.add(createInstructionCombiningPass());
+ // Make sure that the appropriate target data is always used...
+ Passes.add(new TargetData("bugpoint", Result));
+
if (Simplification > 1 && !NoDCE)
Passes.add(createDeadCodeEliminationPass());
- if (Simplification && !NoSCFG)
+ if (Simplification && !DisableSimplifyCFG)
Passes.add(createCFGSimplificationPass()); // Delete dead control flow
Passes.add(createVerifierPass());
return Result;
}
+static const PassInfo *getPI(Pass *P) {
+ const PassInfo *PI = P->getPassInfo();
+ delete P;
+ return PI;
+}
+
/// performFinalCleanups - This method clones the current Program and performs
/// a series of cleanups intended to get rid of extra cruft on the module
/// before handing it to the user...
///
-Module *BugDriver::performFinalCleanups() const {
- Module *M = CloneModule(Program);
- PassManager CleanupPasses;
- CleanupPasses.add(createFunctionResolvingPass());
- CleanupPasses.add(createGlobalDCEPass());
- CleanupPasses.add(createDeadTypeEliminationPass());
- CleanupPasses.add(createVerifierPass());
- CleanupPasses.run(*M);
+Module *BugDriver::performFinalCleanups(Module *M, bool MayModifySemantics) {
+ // Make all functions external, so GlobalDCE doesn't delete them...
+ for (Module::iterator I = M->begin(), E = M->end(); I != E; ++I)
+ I->setLinkage(GlobalValue::ExternalLinkage);
+
+ std::vector<const PassInfo*> CleanupPasses;
+ CleanupPasses.push_back(getPI(createFunctionResolvingPass()));
+ CleanupPasses.push_back(getPI(createGlobalDCEPass()));
+ CleanupPasses.push_back(getPI(createDeadTypeEliminationPass()));
+
+ if (MayModifySemantics)
+ CleanupPasses.push_back(getPI(createDeadArgHackingPass()));
+ else
+ CleanupPasses.push_back(getPI(createDeadArgEliminationPass()));
+
+ std::swap(Program, M);
+ std::string Filename;
+ bool Failed = runPasses(CleanupPasses, Filename);
+ std::swap(Program, M);
+
+ if (Failed) {
+ std::cerr << "Final cleanups failed. Sorry. :(\n";
+ } else {
+ delete M;
+ M = ParseInputFile(Filename);
+ if (M == 0) {
+ std::cerr << getToolName() << ": Error reading bytecode file '"
+ << Filename << "'!\n";
+ exit(1);
+ }
+ removeFile(Filename);
+ }
return M;
}
+
+
+// DeleteFunctionBody - "Remove" the function by deleting all of its basic
+// blocks, making it external.
+//
+void llvm::DeleteFunctionBody(Function *F) {
+ // delete the body of the function...
+ F->deleteBody();
+ assert(F->isExternal() && "This didn't make the function external!");
+}
+
+/// SplitFunctionsOutOfModule - Given a module and a list of functions in the
+/// module, split the functions OUT of the specified module, and place them in
+/// the new module.
+///
+/// FIXME: this could be made DRAMATICALLY more efficient for large programs if
+/// we just MOVED functions from one module to the other, instead of cloning the
+/// whole module, then proceeding to delete an entire module's worth of stuff.
+///
+Module *llvm::SplitFunctionsOutOfModule(Module *M,
+ const std::vector<Function*> &F) {
+ // Make sure functions & globals are all external so that linkage
+ // between the two modules will work.
+ for (Module::iterator I = M->begin(), E = M->end(); I != E; ++I)
+ I->setLinkage(GlobalValue::ExternalLinkage);
+ for (Module::giterator I = M->gbegin(), E = M->gend(); I != E; ++I)
+ I->setLinkage(GlobalValue::ExternalLinkage);
+
+ Module *New = CloneModule(M);
+
+ // Make sure global initializers exist only in the safe module (CBE->.so)
+ for (Module::giterator I = New->gbegin(), E = New->gend(); I != E; ++I)
+ I->setInitializer(0); // Delete the initializer to make it external
+
+ // Remove the Test functions from the Safe module
+ for (unsigned i = 0, e = F.size(); i != e; ++i) {
+ Function *TNOF = M->getFunction(F[i]->getName(), F[i]->getFunctionType());
+ DEBUG(std::cerr << "Removing function " << F[i]->getName() << "\n");
+ assert(TNOF && "Function doesn't exist in module!");
+ DeleteFunctionBody(TNOF); // Function is now external in this module!
+ }
+
+ // Remove the Safe functions from the Test module
+ for (Module::iterator I = New->begin(), E = New->end(); I != E; ++I) {
+ bool funcFound = false;
+ for (std::vector<Function*>::const_iterator FI = F.begin(), Fe = F.end();
+ FI != Fe; ++FI)
+ if (I->getName() == (*FI)->getName()) funcFound = true;
+
+ if (!funcFound)
+ DeleteFunctionBody(I);
+ }
+ return New;
+}
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