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https://github.com/c64scene-ar/llvm-6502.git
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This patch replaces the SymbolTable class with ValueSymbolTable which does not support types planes. This means that all symbol names in LLVM must now be unique. The patch addresses the necessary changes to deal with this and removes code no longer needed as a result. This completes the bulk of the changes for this PR. Some cleanup patches will follow. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33918 91177308-0d34-0410-b5e6-96231b3b80d8
365 lines
14 KiB
C++
365 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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EmitProgressBytecode("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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};
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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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EmitProgressBytecode("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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