//===- 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 is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
//===----------------------------------------------------------------------===//
//
// This file implements several methods that are used to extract functions,
//===----------------------------------------------------------------------===//
#include "BugDriver.h"
-#include "llvm/Constant.h"
+#include "llvm/Constants.h"
+#include "llvm/DerivedTypes.h"
+#include "llvm/LLVMContext.h"
#include "llvm/Module.h"
#include "llvm/PassManager.h"
#include "llvm/Pass.h"
-#include "llvm/Type.h"
#include "llvm/Analysis/Verifier.h"
+#include "llvm/Assembly/Writer.h"
#include "llvm/Transforms/IPO.h"
#include "llvm/Transforms/Scalar.h"
#include "llvm/Transforms/Utils/Cloning.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/FileUtilities.h"
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/System/Path.h"
+#include "llvm/System/Signals.h"
#include <set>
using namespace llvm;
namespace llvm {
bool DisableSimplifyCFG = false;
+ extern cl::opt<std::string> OutputPrefix;
} // End llvm namespace
namespace {
Instruction *TheInst = RI; // Got the corresponding instruction!
// If this instruction produces a value, replace any users with null values
- if (TheInst->getType() != Type::VoidTy)
+ if (!TheInst->getType()->isVoidTy())
TheInst->replaceAllUsesWith(Constant::getNullValue(TheInst->getType()));
// Remove the instruction from the program.
TheInst->getParent()->getInstList().erase(TheInst);
+
+ //writeProgramToFile("current.bc", Result);
+
// Spiff up the output a little bit.
PassManager Passes;
// Make sure that the appropriate target data is always used...
- Passes.add(new TargetData("bugpoint", Result));
+ Passes.add(new TargetData(Result));
/// FIXME: If this used runPasses() like the methods below, we could get rid
/// of the -disable-* options!
/// 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...
+/// before handing it to the user.
///
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()));
+ CleanupPasses.push_back(getPI(createDeadTypeEliminationPass()));
+
Module *New = runPassesOn(M, CleanupPasses);
if (New == 0) {
- std::cerr << "Final cleanups failed. Sorry. :( Please report a bug!\n";
+ errs() << "Final cleanups failed. Sorry. :( Please report a bug!\n";
+ return M;
}
delete M;
return New;
Module *NewM = runPassesOn(M, LoopExtractPasses);
if (NewM == 0) {
- Module *Old = swapProgramIn(M);
- std::cout << "*** Loop extraction failed: ";
- EmitProgressBytecode("loopextraction", true);
- std::cout << "*** Sorry. :( Please report a bug!\n";
- swapProgramIn(Old);
+ outs() << "*** Loop extraction failed: ";
+ EmitProgressBitcode(M, "loopextraction", true);
+ outs() << "*** Sorry. :( Please report a bug!\n";
return 0;
}
for (unsigned i = 0, e = M->size(); i != e; ++i)
++MI;
}
-
+
return NewM;
}
void llvm::DeleteFunctionBody(Function *F) {
// delete the body of the function...
F->deleteBody();
- assert(F->isExternal() && "This didn't make the function external!");
+ assert(F->isDeclaration() && "This didn't make the function external!");
+}
+
+/// GetTorInit - Given a list of entries for static ctors/dtors, return them
+/// as a constant array.
+static Constant *GetTorInit(std::vector<std::pair<Function*, int> > &TorList) {
+ assert(!TorList.empty() && "Don't create empty tor list!");
+ std::vector<Constant*> ArrayElts;
+ for (unsigned i = 0, e = TorList.size(); i != e; ++i) {
+ std::vector<Constant*> Elts;
+ Elts.push_back(ConstantInt::get(
+ Type::getInt32Ty(TorList[i].first->getContext()), TorList[i].second));
+ Elts.push_back(TorList[i].first);
+ ArrayElts.push_back(ConstantStruct::get(TorList[i].first->getContext(),
+ Elts, false));
+ }
+ return ConstantArray::get(ArrayType::get(ArrayElts[0]->getType(),
+ ArrayElts.size()),
+ ArrayElts);
}
+/// SplitStaticCtorDtor - A module was recently split into two parts, M1/M2, and
+/// M1 has all of the global variables. If M2 contains any functions that are
+/// static ctors/dtors, we need to add an llvm.global_[cd]tors global to M2, and
+/// prune appropriate entries out of M1s list.
+static void SplitStaticCtorDtor(const char *GlobalName, Module *M1, Module *M2,
+ ValueMap<const Value*, Value*> &VMap) {
+ GlobalVariable *GV = M1->getNamedGlobal(GlobalName);
+ if (!GV || GV->isDeclaration() || GV->hasLocalLinkage() ||
+ !GV->use_empty()) return;
+
+ std::vector<std::pair<Function*, int> > M1Tors, M2Tors;
+ ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
+ if (!InitList) return;
+
+ for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
+ if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
+ if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
+
+ if (CS->getOperand(1)->isNullValue())
+ break; // Found a null terminator, stop here.
+
+ ConstantInt *CI = dyn_cast<ConstantInt>(CS->getOperand(0));
+ int Priority = CI ? CI->getSExtValue() : 0;
+
+ Constant *FP = CS->getOperand(1);
+ if (ConstantExpr *CE = dyn_cast<ConstantExpr>(FP))
+ if (CE->isCast())
+ FP = CE->getOperand(0);
+ if (Function *F = dyn_cast<Function>(FP)) {
+ if (!F->isDeclaration())
+ M1Tors.push_back(std::make_pair(F, Priority));
+ else {
+ // Map to M2's version of the function.
+ F = cast<Function>(VMap[F]);
+ M2Tors.push_back(std::make_pair(F, Priority));
+ }
+ }
+ }
+ }
+
+ GV->eraseFromParent();
+ if (!M1Tors.empty()) {
+ Constant *M1Init = GetTorInit(M1Tors);
+ new GlobalVariable(*M1, M1Init->getType(), false,
+ GlobalValue::AppendingLinkage,
+ M1Init, GlobalName);
+ }
+
+ GV = M2->getNamedGlobal(GlobalName);
+ assert(GV && "Not a clone of M1?");
+ assert(GV->use_empty() && "llvm.ctors shouldn't have uses!");
+
+ GV->eraseFromParent();
+ if (!M2Tors.empty()) {
+ Constant *M2Init = GetTorInit(M2Tors);
+ new GlobalVariable(*M2, M2Init->getType(), false,
+ GlobalValue::AppendingLinkage,
+ M2Init, GlobalName);
+ }
+}
+
+
/// 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) {
+Module *
+llvm::SplitFunctionsOutOfModule(Module *M,
+ const std::vector<Function*> &F,
+ ValueMap<const Value*, Value*> &VMap) {
// 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)
+ for (Module::global_iterator I = M->global_begin(), E = M->global_end();
+ I != E; ++I) {
+ if (I->hasName() && I->getName()[0] == '\01')
+ I->setName(I->getName().substr(1));
I->setLinkage(GlobalValue::ExternalLinkage);
+ }
- Module *New = CloneModule(M);
+ ValueMap<const Value*, Value*> NewVMap;
+ Module *New = CloneModule(M, NewVMap);
// Make sure global initializers exist only in the safe module (CBE->.so)
- for (Module::giterator I = New->gbegin(), E = New->gend(); I != E; ++I)
+ for (Module::global_iterator I = New->global_begin(), E = New->global_end();
+ I != E; ++I)
I->setInitializer(0); // Delete the initializer to make it external
// Remove the Test functions from the Safe module
- std::set<std::pair<std::string, const PointerType*> > TestFunctions;
+ std::set<Function *> TestFunctions;
for (unsigned i = 0, e = F.size(); i != e; ++i) {
- TestFunctions.insert(std::make_pair(F[i]->getName(), F[i]->getType()));
- 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!");
+ Function *TNOF = cast<Function>(VMap[F[i]]);
+ DEBUG(errs() << "Removing function ");
+ DEBUG(WriteAsOperand(errs(), TNOF, false));
+ DEBUG(errs() << "\n");
+ TestFunctions.insert(cast<Function>(NewVMap[TNOF]));
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)
- if (!TestFunctions.count(std::make_pair(I->getName(), I->getType())))
+ if (!TestFunctions.count(I))
DeleteFunctionBody(I);
+
+
+ // Make sure that there is a global ctor/dtor array in both halves of the
+ // module if they both have static ctor/dtor functions.
+ SplitStaticCtorDtor("llvm.global_ctors", M, New, NewVMap);
+ SplitStaticCtorDtor("llvm.global_dtors", M, New, NewVMap);
+
return New;
}
// Basic Block Extraction Code
//===----------------------------------------------------------------------===//
-namespace {
- std::vector<BasicBlock*> BlocksToNotExtract;
-
- /// BlockExtractorPass - This pass is used by bugpoint to extract all blocks
- /// from the module into their own functions except for those specified by the
- /// BlocksToNotExtract list.
- class BlockExtractorPass : public ModulePass {
- bool runOnModule(Module &M);
- };
- RegisterOpt<BlockExtractorPass>
- XX("extract-bbs", "Extract Basic Blocks From Module (for bugpoint use)");
-}
-
-bool BlockExtractorPass::runOnModule(Module &M) {
- std::set<BasicBlock*> TranslatedBlocksToNotExtract;
- for (unsigned i = 0, e = BlocksToNotExtract.size(); i != e; ++i) {
- BasicBlock *BB = BlocksToNotExtract[i];
- Function *F = BB->getParent();
-
- // Map the corresponding function in this module.
- Function *MF = M.getFunction(F->getName(), F->getFunctionType());
-
- // Figure out which index the basic block is in its function.
- Function::iterator BBI = MF->begin();
- std::advance(BBI, std::distance(F->begin(), Function::iterator(BB)));
- TranslatedBlocksToNotExtract.insert(BBI);
- }
-
- // Now that we know which blocks to not extract, figure out which ones we WANT
- // to extract.
- std::vector<BasicBlock*> BlocksToExtract;
- for (Module::iterator F = M.begin(), E = M.end(); F != E; ++F)
- for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB)
- if (!TranslatedBlocksToNotExtract.count(BB))
- BlocksToExtract.push_back(BB);
-
- for (unsigned i = 0, e = BlocksToExtract.size(); i != e; ++i)
- ExtractBasicBlock(BlocksToExtract[i]);
-
- return !BlocksToExtract.empty();
-}
-
/// ExtractMappedBlocksFromModule - Extract all but the specified basic blocks
/// into their own functions. The only detail is that M is actually a module
/// cloned from the one the BBs are in, so some mapping needs to be performed.
Module *BugDriver::ExtractMappedBlocksFromModule(const
std::vector<BasicBlock*> &BBs,
Module *M) {
- // Set the global list so that pass will be able to access it.
- BlocksToNotExtract = BBs;
+ sys::Path uniqueFilename(OutputPrefix + "-extractblocks");
+ std::string ErrMsg;
+ if (uniqueFilename.createTemporaryFileOnDisk(true, &ErrMsg)) {
+ outs() << "*** Basic Block extraction failed!\n";
+ errs() << "Error creating temporary file: " << ErrMsg << "\n";
+ EmitProgressBitcode(M, "basicblockextractfail", true);
+ return 0;
+ }
+ sys::RemoveFileOnSignal(uniqueFilename);
+
+ std::string ErrorInfo;
+ raw_fd_ostream BlocksToNotExtractFile(uniqueFilename.c_str(), ErrorInfo);
+ if (!ErrorInfo.empty()) {
+ outs() << "*** Basic Block extraction failed!\n";
+ errs() << "Error writing list of blocks to not extract: " << ErrorInfo
+ << "\n";
+ EmitProgressBitcode(M, "basicblockextractfail", true);
+ return 0;
+ }
+ for (std::vector<BasicBlock*>::const_iterator I = BBs.begin(), E = BBs.end();
+ I != E; ++I) {
+ BasicBlock *BB = *I;
+ // If the BB doesn't have a name, give it one so we have something to key
+ // off of.
+ if (!BB->hasName()) BB->setName("tmpbb");
+ BlocksToNotExtractFile << BB->getParent()->getNameStr() << " "
+ << BB->getName() << "\n";
+ }
+ BlocksToNotExtractFile.close();
+
+ std::string uniqueFN = "--extract-blocks-file=" + uniqueFilename.str();
+ const char *ExtraArg = uniqueFN.c_str();
std::vector<const PassInfo*> PI;
- PI.push_back(getPI(new BlockExtractorPass()));
- Module *Ret = runPassesOn(M, PI);
- BlocksToNotExtract.clear();
+ PI.push_back(getPI(createBlockExtractorPass()));
+ Module *Ret = runPassesOn(M, PI, false, 1, &ExtraArg);
+
+ uniqueFilename.eraseFromDisk(); // Free disk space
+
if (Ret == 0) {
- std::cout << "*** Basic Block extraction failed, please report a bug!\n";
- M = swapProgramIn(M);
- EmitProgressBytecode("basicblockextractfail", true);
- M = swapProgramIn(M);
+ outs() << "*** Basic Block extraction failed, please report a bug!\n";
+ EmitProgressBitcode(M, "basicblockextractfail", true);
}
return Ret;
}
projects / oota-llvm.git / blobdiff