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Remove MCObjectDisassembler.cpp as it is untested and unused.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214437 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eric Christopher
parent
36daac3759
commit
e8a696fa79
@ -1,574 +0,0 @@
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//===- lib/MC/MCObjectDisassembler.cpp ------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/MC/MCObjectDisassembler.h"
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#include "llvm/ADT/SetVector.h"
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#include "llvm/ADT/SmallPtrSet.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/ADT/Twine.h"
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#include "llvm/MC/MCAnalysis/MCAtom.h"
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#include "llvm/MC/MCAnalysis/MCFunction.h"
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#include "llvm/MC/MCAnalysis/MCModule.h"
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#include "llvm/MC/MCAnalysis/MCObjectSymbolizer.h"
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#include "llvm/MC/MCDisassembler.h"
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#include "llvm/MC/MCInstrAnalysis.h"
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#include "llvm/Object/MachO.h"
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#include "llvm/Object/ObjectFile.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/MachO.h"
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#include "llvm/Support/MemoryObject.h"
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#include "llvm/Support/StringRefMemoryObject.h"
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#include "llvm/Support/raw_ostream.h"
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#include <map>
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using namespace llvm;
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using namespace object;
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#define DEBUG_TYPE "mc"
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MCObjectDisassembler::MCObjectDisassembler(const ObjectFile &Obj,
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const MCDisassembler &Dis,
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const MCInstrAnalysis &MIA)
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: Obj(Obj), Dis(Dis), MIA(MIA), MOS(nullptr) {}
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uint64_t MCObjectDisassembler::getEntrypoint() {
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for (const SymbolRef &Symbol : Obj.symbols()) {
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StringRef Name;
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Symbol.getName(Name);
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if (Name == "main" || Name == "_main") {
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uint64_t Entrypoint;
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Symbol.getAddress(Entrypoint);
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return getEffectiveLoadAddr(Entrypoint);
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}
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}
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return 0;
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}
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ArrayRef<uint64_t> MCObjectDisassembler::getStaticInitFunctions() {
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return ArrayRef<uint64_t>();
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}
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ArrayRef<uint64_t> MCObjectDisassembler::getStaticExitFunctions() {
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return ArrayRef<uint64_t>();
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}
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MemoryObject *MCObjectDisassembler::getRegionFor(uint64_t Addr) {
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// FIXME: Keep track of object sections.
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return FallbackRegion.get();
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}
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uint64_t MCObjectDisassembler::getEffectiveLoadAddr(uint64_t Addr) {
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return Addr;
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}
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uint64_t MCObjectDisassembler::getOriginalLoadAddr(uint64_t Addr) {
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return Addr;
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}
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MCModule *MCObjectDisassembler::buildEmptyModule() {
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MCModule *Module = new MCModule;
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Module->Entrypoint = getEntrypoint();
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return Module;
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}
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MCModule *MCObjectDisassembler::buildModule(bool withCFG) {
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MCModule *Module = buildEmptyModule();
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buildSectionAtoms(Module);
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if (withCFG)
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buildCFG(Module);
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return Module;
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}
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void MCObjectDisassembler::buildSectionAtoms(MCModule *Module) {
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for (const SectionRef &Section : Obj.sections()) {
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bool isText;
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Section.isText(isText);
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bool isData;
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Section.isData(isData);
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if (!isData && !isText)
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continue;
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uint64_t StartAddr;
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Section.getAddress(StartAddr);
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uint64_t SecSize;
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Section.getSize(SecSize);
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if (StartAddr == UnknownAddressOrSize || SecSize == UnknownAddressOrSize)
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continue;
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StartAddr = getEffectiveLoadAddr(StartAddr);
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StringRef Contents;
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Section.getContents(Contents);
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StringRefMemoryObject memoryObject(Contents, StartAddr);
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// We don't care about things like non-file-backed sections yet.
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if (Contents.size() != SecSize || !SecSize)
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continue;
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uint64_t EndAddr = StartAddr + SecSize - 1;
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StringRef SecName;
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Section.getName(SecName);
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if (isText) {
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MCTextAtom *Text = nullptr;
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MCDataAtom *InvalidData = nullptr;
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uint64_t InstSize;
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for (uint64_t Index = 0; Index < SecSize; Index += InstSize) {
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const uint64_t CurAddr = StartAddr + Index;
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MCInst Inst;
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if (Dis.getInstruction(Inst, InstSize, memoryObject, CurAddr, nulls(),
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nulls())) {
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if (!Text) {
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Text = Module->createTextAtom(CurAddr, CurAddr);
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Text->setName(SecName);
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}
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Text->addInst(Inst, InstSize);
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InvalidData = nullptr;
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} else {
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assert(InstSize && "getInstruction() consumed no bytes");
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if (!InvalidData) {
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Text = nullptr;
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InvalidData = Module->createDataAtom(CurAddr, CurAddr+InstSize - 1);
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}
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for (uint64_t I = 0; I < InstSize; ++I)
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InvalidData->addData(Contents[Index+I]);
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}
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}
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} else {
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MCDataAtom *Data = Module->createDataAtom(StartAddr, EndAddr);
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Data->setName(SecName);
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for (uint64_t Index = 0; Index < SecSize; ++Index)
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Data->addData(Contents[Index]);
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}
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}
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}
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namespace {
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struct BBInfo;
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typedef SmallPtrSet<BBInfo*, 2> BBInfoSetTy;
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struct BBInfo {
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MCTextAtom *Atom;
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MCBasicBlock *BB;
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BBInfoSetTy Succs;
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BBInfoSetTy Preds;
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MCObjectDisassembler::AddressSetTy SuccAddrs;
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BBInfo() : Atom(nullptr), BB(nullptr) {}
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void addSucc(BBInfo &Succ) {
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Succs.insert(&Succ);
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Succ.Preds.insert(this);
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}
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};
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}
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static void RemoveDupsFromAddressVector(MCObjectDisassembler::AddressSetTy &V) {
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std::sort(V.begin(), V.end());
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V.erase(std::unique(V.begin(), V.end()), V.end());
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}
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void MCObjectDisassembler::buildCFG(MCModule *Module) {
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typedef std::map<uint64_t, BBInfo> BBInfoByAddrTy;
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BBInfoByAddrTy BBInfos;
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AddressSetTy Splits;
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AddressSetTy Calls;
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for (const SymbolRef &Symbol : Obj.symbols()) {
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SymbolRef::Type SymType;
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Symbol.getType(SymType);
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if (SymType == SymbolRef::ST_Function) {
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uint64_t SymAddr;
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Symbol.getAddress(SymAddr);
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SymAddr = getEffectiveLoadAddr(SymAddr);
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Calls.push_back(SymAddr);
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Splits.push_back(SymAddr);
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}
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}
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assert(Module->func_begin() == Module->func_end()
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&& "Module already has a CFG!");
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// First, determine the basic block boundaries and call targets.
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for (MCModule::atom_iterator AI = Module->atom_begin(),
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AE = Module->atom_end();
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AI != AE; ++AI) {
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MCTextAtom *TA = dyn_cast<MCTextAtom>(*AI);
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if (!TA) continue;
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Calls.push_back(TA->getBeginAddr());
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BBInfos[TA->getBeginAddr()].Atom = TA;
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for (MCTextAtom::const_iterator II = TA->begin(), IE = TA->end();
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II != IE; ++II) {
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if (MIA.isTerminator(II->Inst))
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Splits.push_back(II->Address + II->Size);
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uint64_t Target;
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if (MIA.evaluateBranch(II->Inst, II->Address, II->Size, Target)) {
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if (MIA.isCall(II->Inst))
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Calls.push_back(Target);
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Splits.push_back(Target);
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}
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}
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}
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RemoveDupsFromAddressVector(Splits);
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RemoveDupsFromAddressVector(Calls);
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// Split text atoms into basic block atoms.
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for (AddressSetTy::const_iterator SI = Splits.begin(), SE = Splits.end();
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SI != SE; ++SI) {
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MCAtom *A = Module->findAtomContaining(*SI);
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if (!A) continue;
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MCTextAtom *TA = cast<MCTextAtom>(A);
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if (TA->getBeginAddr() == *SI)
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continue;
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MCTextAtom *NewAtom = TA->split(*SI);
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BBInfos[NewAtom->getBeginAddr()].Atom = NewAtom;
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StringRef BBName = TA->getName();
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BBName = BBName.substr(0, BBName.find_last_of(':'));
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NewAtom->setName((BBName + ":" + utohexstr(*SI)).str());
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}
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// Compute succs/preds.
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for (MCModule::atom_iterator AI = Module->atom_begin(),
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AE = Module->atom_end();
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AI != AE; ++AI) {
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MCTextAtom *TA = dyn_cast<MCTextAtom>(*AI);
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if (!TA) continue;
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BBInfo &CurBB = BBInfos[TA->getBeginAddr()];
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const MCDecodedInst &LI = TA->back();
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if (MIA.isBranch(LI.Inst)) {
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uint64_t Target;
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if (MIA.evaluateBranch(LI.Inst, LI.Address, LI.Size, Target))
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CurBB.addSucc(BBInfos[Target]);
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if (MIA.isConditionalBranch(LI.Inst))
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CurBB.addSucc(BBInfos[LI.Address + LI.Size]);
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} else if (!MIA.isTerminator(LI.Inst))
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CurBB.addSucc(BBInfos[LI.Address + LI.Size]);
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}
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// Create functions and basic blocks.
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for (AddressSetTy::const_iterator CI = Calls.begin(), CE = Calls.end();
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CI != CE; ++CI) {
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BBInfo &BBI = BBInfos[*CI];
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if (!BBI.Atom) continue;
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MCFunction &MCFN = *Module->createFunction(BBI.Atom->getName());
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// Create MCBBs.
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SmallSetVector<BBInfo*, 16> Worklist;
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Worklist.insert(&BBI);
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for (size_t wi = 0; wi < Worklist.size(); ++wi) {
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BBInfo *BBI = Worklist[wi];
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if (!BBI->Atom)
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continue;
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BBI->BB = &MCFN.createBlock(*BBI->Atom);
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// Add all predecessors and successors to the worklist.
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for (BBInfoSetTy::iterator SI = BBI->Succs.begin(), SE = BBI->Succs.end();
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SI != SE; ++SI)
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Worklist.insert(*SI);
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for (BBInfoSetTy::iterator PI = BBI->Preds.begin(), PE = BBI->Preds.end();
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PI != PE; ++PI)
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Worklist.insert(*PI);
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}
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// Set preds/succs.
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for (size_t wi = 0; wi < Worklist.size(); ++wi) {
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BBInfo *BBI = Worklist[wi];
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MCBasicBlock *MCBB = BBI->BB;
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if (!MCBB)
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continue;
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for (BBInfoSetTy::iterator SI = BBI->Succs.begin(), SE = BBI->Succs.end();
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SI != SE; ++SI)
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if ((*SI)->BB)
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MCBB->addSuccessor((*SI)->BB);
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for (BBInfoSetTy::iterator PI = BBI->Preds.begin(), PE = BBI->Preds.end();
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PI != PE; ++PI)
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if ((*PI)->BB)
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MCBB->addPredecessor((*PI)->BB);
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}
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}
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}
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// Basic idea of the disassembly + discovery:
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//
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// start with the wanted address, insert it in the worklist
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// while worklist not empty, take next address in the worklist:
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// - check if atom exists there
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// - if middle of atom:
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// - split basic blocks referencing the atom
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// - look for an already encountered BBInfo (using a map<atom, bbinfo>)
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// - if there is, split it (new one, fallthrough, move succs, etc..)
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// - if start of atom: nothing else to do
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// - if no atom: create new atom and new bbinfo
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// - look at the last instruction in the atom, add succs to worklist
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// for all elements in the worklist:
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// - create basic block, update preds/succs, etc..
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//
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MCBasicBlock *MCObjectDisassembler::getBBAt(MCModule *Module, MCFunction *MCFN,
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uint64_t BBBeginAddr,
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AddressSetTy &CallTargets,
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AddressSetTy &TailCallTargets) {
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typedef std::map<uint64_t, BBInfo> BBInfoByAddrTy;
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typedef SmallSetVector<uint64_t, 16> AddrWorklistTy;
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BBInfoByAddrTy BBInfos;
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AddrWorklistTy Worklist;
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Worklist.insert(BBBeginAddr);
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for (size_t wi = 0; wi < Worklist.size(); ++wi) {
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const uint64_t BeginAddr = Worklist[wi];
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BBInfo *BBI = &BBInfos[BeginAddr];
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MCTextAtom *&TA = BBI->Atom;
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assert(!TA && "Discovered basic block already has an associated atom!");
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// Look for an atom at BeginAddr.
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if (MCAtom *A = Module->findAtomContaining(BeginAddr)) {
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// FIXME: We don't care about mixed atoms, see above.
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TA = cast<MCTextAtom>(A);
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// The found atom doesn't begin at BeginAddr, we have to split it.
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if (TA->getBeginAddr() != BeginAddr) {
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// FIXME: Handle overlapping atoms: middle-starting instructions, etc..
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MCTextAtom *NewTA = TA->split(BeginAddr);
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// Look for an already encountered basic block that needs splitting
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BBInfoByAddrTy::iterator It = BBInfos.find(TA->getBeginAddr());
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if (It != BBInfos.end() && It->second.Atom) {
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BBI->SuccAddrs = It->second.SuccAddrs;
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It->second.SuccAddrs.clear();
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It->second.SuccAddrs.push_back(BeginAddr);
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}
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TA = NewTA;
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}
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BBI->Atom = TA;
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} else {
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// If we didn't find an atom, then we have to disassemble to create one!
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MemoryObject *Region = getRegionFor(BeginAddr);
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if (!Region)
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llvm_unreachable(("Couldn't find suitable region for disassembly at " +
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utostr(BeginAddr)).c_str());
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uint64_t InstSize;
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uint64_t EndAddr = Region->getBase() + Region->getExtent();
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// We want to stop before the next atom and have a fallthrough to it.
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if (MCTextAtom *NextAtom =
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cast_or_null<MCTextAtom>(Module->findFirstAtomAfter(BeginAddr)))
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EndAddr = std::min(EndAddr, NextAtom->getBeginAddr());
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for (uint64_t Addr = BeginAddr; Addr < EndAddr; Addr += InstSize) {
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MCInst Inst;
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if (Dis.getInstruction(Inst, InstSize, *Region, Addr, nulls(),
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nulls())) {
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if (!TA)
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TA = Module->createTextAtom(Addr, Addr);
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TA->addInst(Inst, InstSize);
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} else {
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// We don't care about splitting mixed atoms either.
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llvm_unreachable("Couldn't disassemble instruction in atom.");
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}
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uint64_t BranchTarget;
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if (MIA.evaluateBranch(Inst, Addr, InstSize, BranchTarget)) {
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if (MIA.isCall(Inst))
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CallTargets.push_back(BranchTarget);
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}
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if (MIA.isTerminator(Inst))
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break;
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}
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BBI->Atom = TA;
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}
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assert(TA && "Couldn't disassemble atom, none was created!");
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assert(TA->begin() != TA->end() && "Empty atom!");
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MemoryObject *Region = getRegionFor(TA->getBeginAddr());
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assert(Region && "Couldn't find region for already disassembled code!");
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uint64_t EndRegion = Region->getBase() + Region->getExtent();
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// Now we have a basic block atom, add successors.
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// Add the fallthrough block.
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if ((MIA.isConditionalBranch(TA->back().Inst) ||
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!MIA.isTerminator(TA->back().Inst)) &&
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(TA->getEndAddr() + 1 < EndRegion)) {
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BBI->SuccAddrs.push_back(TA->getEndAddr() + 1);
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Worklist.insert(TA->getEndAddr() + 1);
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}
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// If the terminator is a branch, add the target block.
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if (MIA.isBranch(TA->back().Inst)) {
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uint64_t BranchTarget;
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if (MIA.evaluateBranch(TA->back().Inst, TA->back().Address,
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TA->back().Size, BranchTarget)) {
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StringRef ExtFnName;
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if (MOS)
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ExtFnName =
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MOS->findExternalFunctionAt(getOriginalLoadAddr(BranchTarget));
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if (!ExtFnName.empty()) {
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TailCallTargets.push_back(BranchTarget);
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CallTargets.push_back(BranchTarget);
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} else {
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BBI->SuccAddrs.push_back(BranchTarget);
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Worklist.insert(BranchTarget);
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}
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}
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}
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}
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for (size_t wi = 0, we = Worklist.size(); wi != we; ++wi) {
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const uint64_t BeginAddr = Worklist[wi];
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BBInfo *BBI = &BBInfos[BeginAddr];
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assert(BBI->Atom && "Found a basic block without an associated atom!");
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// Look for a basic block at BeginAddr.
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BBI->BB = MCFN->find(BeginAddr);
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if (BBI->BB) {
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// FIXME: check that the succs/preds are the same
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continue;
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}
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// If there was none, we have to create one from the atom.
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BBI->BB = &MCFN->createBlock(*BBI->Atom);
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}
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for (size_t wi = 0, we = Worklist.size(); wi != we; ++wi) {
|
||||
const uint64_t BeginAddr = Worklist[wi];
|
||||
BBInfo *BBI = &BBInfos[BeginAddr];
|
||||
MCBasicBlock *BB = BBI->BB;
|
||||
|
||||
RemoveDupsFromAddressVector(BBI->SuccAddrs);
|
||||
for (AddressSetTy::const_iterator SI = BBI->SuccAddrs.begin(),
|
||||
SE = BBI->SuccAddrs.end();
|
||||
SI != SE; ++SI) {
|
||||
MCBasicBlock *Succ = BBInfos[*SI].BB;
|
||||
BB->addSuccessor(Succ);
|
||||
Succ->addPredecessor(BB);
|
||||
}
|
||||
}
|
||||
|
||||
assert(BBInfos[Worklist[0]].BB &&
|
||||
"No basic block created at requested address?");
|
||||
|
||||
return BBInfos[Worklist[0]].BB;
|
||||
}
|
||||
|
||||
MCFunction *
|
||||
MCObjectDisassembler::createFunction(MCModule *Module, uint64_t BeginAddr,
|
||||
AddressSetTy &CallTargets,
|
||||
AddressSetTy &TailCallTargets) {
|
||||
// First, check if this is an external function.
|
||||
StringRef ExtFnName;
|
||||
if (MOS)
|
||||
ExtFnName = MOS->findExternalFunctionAt(getOriginalLoadAddr(BeginAddr));
|
||||
if (!ExtFnName.empty())
|
||||
return Module->createFunction(ExtFnName);
|
||||
|
||||
// If it's not, look for an existing function.
|
||||
for (MCModule::func_iterator FI = Module->func_begin(),
|
||||
FE = Module->func_end();
|
||||
FI != FE; ++FI) {
|
||||
if ((*FI)->empty())
|
||||
continue;
|
||||
// FIXME: MCModule should provide a findFunctionByAddr()
|
||||
if ((*FI)->getEntryBlock()->getInsts()->getBeginAddr() == BeginAddr)
|
||||
return FI->get();
|
||||
}
|
||||
|
||||
// Finally, just create a new one.
|
||||
MCFunction *MCFN = Module->createFunction("");
|
||||
getBBAt(Module, MCFN, BeginAddr, CallTargets, TailCallTargets);
|
||||
return MCFN;
|
||||
}
|
||||
|
||||
// MachO MCObjectDisassembler implementation.
|
||||
|
||||
MCMachOObjectDisassembler::MCMachOObjectDisassembler(
|
||||
const MachOObjectFile &MOOF, const MCDisassembler &Dis,
|
||||
const MCInstrAnalysis &MIA, uint64_t VMAddrSlide,
|
||||
uint64_t HeaderLoadAddress)
|
||||
: MCObjectDisassembler(MOOF, Dis, MIA), MOOF(MOOF),
|
||||
VMAddrSlide(VMAddrSlide), HeaderLoadAddress(HeaderLoadAddress) {
|
||||
|
||||
for (const SectionRef &Section : MOOF.sections()) {
|
||||
StringRef Name;
|
||||
Section.getName(Name);
|
||||
// FIXME: We should use the S_ section type instead of the name.
|
||||
if (Name == "__mod_init_func") {
|
||||
DEBUG(dbgs() << "Found __mod_init_func section!\n");
|
||||
Section.getContents(ModInitContents);
|
||||
} else if (Name == "__mod_exit_func") {
|
||||
DEBUG(dbgs() << "Found __mod_exit_func section!\n");
|
||||
Section.getContents(ModExitContents);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// FIXME: Only do the translations for addresses actually inside the object.
|
||||
uint64_t MCMachOObjectDisassembler::getEffectiveLoadAddr(uint64_t Addr) {
|
||||
return Addr + VMAddrSlide;
|
||||
}
|
||||
|
||||
uint64_t
|
||||
MCMachOObjectDisassembler::getOriginalLoadAddr(uint64_t EffectiveAddr) {
|
||||
return EffectiveAddr - VMAddrSlide;
|
||||
}
|
||||
|
||||
uint64_t MCMachOObjectDisassembler::getEntrypoint() {
|
||||
uint64_t EntryFileOffset = 0;
|
||||
|
||||
// Look for LC_MAIN.
|
||||
{
|
||||
uint32_t LoadCommandCount = MOOF.getHeader().ncmds;
|
||||
MachOObjectFile::LoadCommandInfo Load = MOOF.getFirstLoadCommandInfo();
|
||||
for (unsigned I = 0;; ++I) {
|
||||
if (Load.C.cmd == MachO::LC_MAIN) {
|
||||
EntryFileOffset =
|
||||
((const MachO::entry_point_command *)Load.Ptr)->entryoff;
|
||||
break;
|
||||
}
|
||||
|
||||
if (I == LoadCommandCount - 1)
|
||||
break;
|
||||
else
|
||||
Load = MOOF.getNextLoadCommandInfo(Load);
|
||||
}
|
||||
}
|
||||
|
||||
// If we didn't find anything, default to the common implementation.
|
||||
// FIXME: Maybe we could also look at LC_UNIXTHREAD and friends?
|
||||
if (EntryFileOffset)
|
||||
return MCObjectDisassembler::getEntrypoint();
|
||||
|
||||
return EntryFileOffset + HeaderLoadAddress;
|
||||
}
|
||||
|
||||
ArrayRef<uint64_t> MCMachOObjectDisassembler::getStaticInitFunctions() {
|
||||
// FIXME: We only handle 64bit mach-o
|
||||
assert(MOOF.is64Bit());
|
||||
|
||||
size_t EntrySize = 8;
|
||||
size_t EntryCount = ModInitContents.size() / EntrySize;
|
||||
return ArrayRef<uint64_t>(
|
||||
reinterpret_cast<const uint64_t *>(ModInitContents.data()), EntryCount);
|
||||
}
|
||||
|
||||
ArrayRef<uint64_t> MCMachOObjectDisassembler::getStaticExitFunctions() {
|
||||
// FIXME: We only handle 64bit mach-o
|
||||
assert(MOOF.is64Bit());
|
||||
|
||||
size_t EntrySize = 8;
|
||||
size_t EntryCount = ModExitContents.size() / EntrySize;
|
||||
return ArrayRef<uint64_t>(
|
||||
reinterpret_cast<const uint64_t *>(ModExitContents.data()), EntryCount);
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user