X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FMC%2FMCContext.cpp;h=7702da3540ca56b1a28a895c6ae657a4dc3eee42;hb=0a15e20ba2dd11dfbc3a38418047cea19674f356;hp=78d6a77dfb8aecbe203c10c28a60f2632420e945;hpb=1a5c28f4715d84d0302581a67e193d7a358bba17;p=oota-llvm.git diff --git a/lib/MC/MCContext.cpp b/lib/MC/MCContext.cpp index 78d6a77dfb8..7702da3540c 100644 --- a/lib/MC/MCContext.cpp +++ b/lib/MC/MCContext.cpp @@ -8,55 +8,374 @@ //===----------------------------------------------------------------------===// #include "llvm/MC/MCContext.h" -#include "llvm/MC/MCAsmInfo.h" -#include "llvm/MC/MCSection.h" -#include "llvm/MC/MCSymbol.h" #include "llvm/ADT/SmallString.h" #include "llvm/ADT/Twine.h" +#include "llvm/MC/MCAsmInfo.h" +#include "llvm/MC/MCDwarf.h" +#include "llvm/MC/MCLabel.h" +#include "llvm/MC/MCObjectFileInfo.h" +#include "llvm/MC/MCRegisterInfo.h" +#include "llvm/MC/MCSectionCOFF.h" +#include "llvm/MC/MCSectionELF.h" +#include "llvm/MC/MCSectionMachO.h" +#include "llvm/MC/MCSymbol.h" +#include "llvm/Support/ELF.h" +#include "llvm/Support/ErrorHandling.h" +#include "llvm/Support/FileSystem.h" +#include "llvm/Support/MemoryBuffer.h" +#include "llvm/Support/Signals.h" +#include "llvm/Support/SourceMgr.h" +#include + using namespace llvm; -MCContext::MCContext(const MCAsmInfo &mai) : MAI(mai), NextUniqueID(0) { +MCContext::MCContext(const MCAsmInfo *mai, const MCRegisterInfo *mri, + const MCObjectFileInfo *mofi, const SourceMgr *mgr, + bool DoAutoReset) + : SrcMgr(mgr), MAI(mai), MRI(mri), MOFI(mofi), Allocator(), + Symbols(Allocator), UsedNames(Allocator), NextUniqueID(0), + CurrentDwarfLoc(0, 0, 0, DWARF2_FLAG_IS_STMT, 0, 0), DwarfLocSeen(false), + GenDwarfForAssembly(false), GenDwarfFileNumber(0), DwarfVersion(4), + AllowTemporaryLabels(true), DwarfCompileUnitID(0), + AutoReset(DoAutoReset) { + + std::error_code EC = llvm::sys::fs::current_path(CompilationDir); + if (EC) + CompilationDir.clear(); + + SecureLogFile = getenv("AS_SECURE_LOG_FILE"); + SecureLog = nullptr; + SecureLogUsed = false; + + if (SrcMgr && SrcMgr->getNumBuffers()) + MainFileName = + SrcMgr->getMemoryBuffer(SrcMgr->getMainFileID())->getBufferIdentifier(); } MCContext::~MCContext() { - // NOTE: The sections are all allocated out of a bump pointer allocator, + + if (AutoReset) + reset(); + + // NOTE: The symbols are all allocated out of a bump pointer allocator, // we don't need to free them here. + + // If the stream for the .secure_log_unique directive was created free it. + delete (raw_ostream*)SecureLog; +} + +//===----------------------------------------------------------------------===// +// Module Lifetime Management +//===----------------------------------------------------------------------===// + +void MCContext::reset() { + UsedNames.clear(); + Symbols.clear(); + Allocator.Reset(); + Instances.clear(); + MCDwarfLineTablesCUMap.clear(); + MCGenDwarfLabelEntries.clear(); + DwarfDebugFlags = StringRef(); + DwarfCompileUnitID = 0; + CurrentDwarfLoc = MCDwarfLoc(0,0,0,DWARF2_FLAG_IS_STMT,0,0); + + MachOUniquingMap.clear(); + ELFUniquingMap.clear(); + COFFUniquingMap.clear(); + + NextUniqueID = 0; + AllowTemporaryLabels = true; + DwarfLocSeen = false; + GenDwarfForAssembly = false; + GenDwarfFileNumber = 0; } +//===----------------------------------------------------------------------===// +// Symbol Manipulation +//===----------------------------------------------------------------------===// + MCSymbol *MCContext::GetOrCreateSymbol(StringRef Name) { assert(!Name.empty() && "Normal symbols cannot be unnamed!"); - MCSymbol *&Entry = Symbols[Name]; - if (Entry) return Entry; - return Entry = new (*this) MCSymbol(Name, false); + // Do the lookup and get the entire StringMapEntry. We want access to the + // key if we are creating the entry. + StringMapEntry &Entry = Symbols.GetOrCreateValue(Name); + MCSymbol *Sym = Entry.getValue(); + + if (Sym) + return Sym; + + Sym = CreateSymbol(Name); + Entry.setValue(Sym); + return Sym; +} + +MCSymbol *MCContext::CreateSymbol(StringRef Name) { + // Determine whether this is an assembler temporary or normal label, if used. + bool isTemporary = false; + if (AllowTemporaryLabels) + isTemporary = Name.startswith(MAI->getPrivateGlobalPrefix()); + + StringMapEntry *NameEntry = &UsedNames.GetOrCreateValue(Name); + if (NameEntry->getValue()) { + assert(isTemporary && "Cannot rename non-temporary symbols"); + SmallString<128> NewName = Name; + do { + NewName.resize(Name.size()); + raw_svector_ostream(NewName) << NextUniqueID++; + NameEntry = &UsedNames.GetOrCreateValue(NewName); + } while (NameEntry->getValue()); + } + NameEntry->setValue(true); + + // Ok, the entry doesn't already exist. Have the MCSymbol object itself refer + // to the copy of the string that is embedded in the UsedNames entry. + MCSymbol *Result = new (*this) MCSymbol(NameEntry->getKey(), isTemporary); + + return Result; } MCSymbol *MCContext::GetOrCreateSymbol(const Twine &Name) { SmallString<128> NameSV; - Name.toVector(NameSV); - return GetOrCreateSymbol(NameSV.str()); + return GetOrCreateSymbol(Name.toStringRef(NameSV)); } - -MCSymbol *MCContext::GetOrCreateTemporarySymbol(StringRef Name) { - // If there is no name, create a new anonymous symbol. - if (Name.empty()) - return GetOrCreateTemporarySymbol(Twine(MAI.getPrivateGlobalPrefix()) + - "tmp" + Twine(NextUniqueID++)); - - // Otherwise create as usual. - MCSymbol *&Entry = Symbols[Name]; - if (Entry) return Entry; - return Entry = new (*this) MCSymbol(Name, true); +MCSymbol *MCContext::CreateLinkerPrivateTempSymbol() { + SmallString<128> NameSV; + raw_svector_ostream(NameSV) + << MAI->getLinkerPrivateGlobalPrefix() << "tmp" << NextUniqueID++; + return CreateSymbol(NameSV); } -MCSymbol *MCContext::GetOrCreateTemporarySymbol(const Twine &Name) { +MCSymbol *MCContext::CreateTempSymbol() { SmallString<128> NameSV; - Name.toVector(NameSV); - return GetOrCreateTemporarySymbol(NameSV.str()); + raw_svector_ostream(NameSV) + << MAI->getPrivateGlobalPrefix() << "tmp" << NextUniqueID++; + return CreateSymbol(NameSV); } +unsigned MCContext::NextInstance(unsigned LocalLabelVal) { + MCLabel *&Label = Instances[LocalLabelVal]; + if (!Label) + Label = new (*this) MCLabel(0); + return Label->incInstance(); +} + +unsigned MCContext::GetInstance(unsigned LocalLabelVal) { + MCLabel *&Label = Instances[LocalLabelVal]; + if (!Label) + Label = new (*this) MCLabel(0); + return Label->getInstance(); +} + +MCSymbol *MCContext::getOrCreateDirectionalLocalSymbol(unsigned LocalLabelVal, + unsigned Instance) { + MCSymbol *&Sym = LocalSymbols[std::make_pair(LocalLabelVal, Instance)]; + if (!Sym) + Sym = CreateTempSymbol(); + return Sym; +} + +MCSymbol *MCContext::CreateDirectionalLocalSymbol(unsigned LocalLabelVal) { + unsigned Instance = NextInstance(LocalLabelVal); + return getOrCreateDirectionalLocalSymbol(LocalLabelVal, Instance); +} + +MCSymbol *MCContext::GetDirectionalLocalSymbol(unsigned LocalLabelVal, + bool Before) { + unsigned Instance = GetInstance(LocalLabelVal); + if (!Before) + ++Instance; + return getOrCreateDirectionalLocalSymbol(LocalLabelVal, Instance); +} MCSymbol *MCContext::LookupSymbol(StringRef Name) const { return Symbols.lookup(Name); } + +MCSymbol *MCContext::LookupSymbol(const Twine &Name) const { + SmallString<128> NameSV; + Name.toVector(NameSV); + return LookupSymbol(NameSV.str()); +} + +//===----------------------------------------------------------------------===// +// Section Management +//===----------------------------------------------------------------------===// + +const MCSectionMachO *MCContext:: +getMachOSection(StringRef Segment, StringRef Section, + unsigned TypeAndAttributes, + unsigned Reserved2, SectionKind Kind) { + + // We unique sections by their segment/section pair. The returned section + // may not have the same flags as the requested section, if so this should be + // diagnosed by the client as an error. + + // Form the name to look up. + SmallString<64> Name; + Name += Segment; + Name.push_back(','); + Name += Section; + + // Do the lookup, if we have a hit, return it. + const MCSectionMachO *&Entry = MachOUniquingMap[Name.str()]; + if (Entry) return Entry; + + // Otherwise, return a new section. + return Entry = new (*this) MCSectionMachO(Segment, Section, TypeAndAttributes, + Reserved2, Kind); +} + +const MCSectionELF *MCContext:: +getELFSection(StringRef Section, unsigned Type, unsigned Flags, + SectionKind Kind) { + return getELFSection(Section, Type, Flags, Kind, 0, ""); +} + +void MCContext::renameELFSection(const MCSectionELF *Section, StringRef Name) { + StringRef GroupName; + if (const MCSymbol *Group = Section->getGroup()) + GroupName = Group->getName(); + + ELFUniquingMap.erase(SectionGroupPair(Section->getSectionName(), GroupName)); + auto I = + ELFUniquingMap.insert(std::make_pair(SectionGroupPair(Name, GroupName), + Section)).first; + StringRef CachedName = I->first.first; + const_cast(Section)->setSectionName(CachedName); +} + +const MCSectionELF *MCContext:: +getELFSection(StringRef Section, unsigned Type, unsigned Flags, + SectionKind Kind, unsigned EntrySize, StringRef Group) { + // Do the lookup, if we have a hit, return it. + auto IterBool = ELFUniquingMap.insert( + std::make_pair(SectionGroupPair(Section, Group), nullptr)); + auto &Entry = *IterBool.first; + if (!IterBool.second) return Entry.second; + + // Possibly refine the entry size first. + if (!EntrySize) { + EntrySize = MCSectionELF::DetermineEntrySize(Kind); + } + + MCSymbol *GroupSym = nullptr; + if (!Group.empty()) + GroupSym = GetOrCreateSymbol(Group); + + StringRef CachedName = Entry.first.first; + MCSectionELF *Result = new (*this) + MCSectionELF(CachedName, Type, Flags, Kind, EntrySize, GroupSym); + Entry.second = Result; + return Result; +} + +const MCSectionELF *MCContext::CreateELFGroupSection() { + MCSectionELF *Result = + new (*this) MCSectionELF(".group", ELF::SHT_GROUP, 0, + SectionKind::getReadOnly(), 4, nullptr); + return Result; +} + +const MCSectionCOFF *MCContext::getCOFFSection(StringRef Section, + unsigned Characteristics, + SectionKind Kind, + StringRef COMDATSymName, + int Selection) { + // Do the lookup, if we have a hit, return it. + + SectionGroupTriple T(Section, COMDATSymName, Selection); + auto IterBool = COFFUniquingMap.insert(std::make_pair(T, nullptr)); + auto Iter = IterBool.first; + if (!IterBool.second) + return Iter->second; + + MCSymbol *COMDATSymbol = nullptr; + if (!COMDATSymName.empty()) + COMDATSymbol = GetOrCreateSymbol(COMDATSymName); + + StringRef CachedName = std::get<0>(Iter->first); + MCSectionCOFF *Result = new (*this) + MCSectionCOFF(CachedName, Characteristics, COMDATSymbol, Selection, Kind); + + Iter->second = Result; + return Result; +} + +const MCSectionCOFF * +MCContext::getCOFFSection(StringRef Section, unsigned Characteristics, + SectionKind Kind) { + return getCOFFSection(Section, Characteristics, Kind, "", 0); +} + +const MCSectionCOFF *MCContext::getCOFFSection(StringRef Section) { + SectionGroupTriple T(Section, "", 0); + auto Iter = COFFUniquingMap.find(T); + if (Iter == COFFUniquingMap.end()) + return nullptr; + return Iter->second; +} + +//===----------------------------------------------------------------------===// +// Dwarf Management +//===----------------------------------------------------------------------===// + +/// GetDwarfFile - takes a file name an number to place in the dwarf file and +/// directory tables. If the file number has already been allocated it is an +/// error and zero is returned and the client reports the error, else the +/// allocated file number is returned. The file numbers may be in any order. +unsigned MCContext::GetDwarfFile(StringRef Directory, StringRef FileName, + unsigned FileNumber, unsigned CUID) { + MCDwarfLineTable &Table = MCDwarfLineTablesCUMap[CUID]; + return Table.getFile(Directory, FileName, FileNumber); +} + +/// isValidDwarfFileNumber - takes a dwarf file number and returns true if it +/// currently is assigned and false otherwise. +bool MCContext::isValidDwarfFileNumber(unsigned FileNumber, unsigned CUID) { + const SmallVectorImpl& MCDwarfFiles = getMCDwarfFiles(CUID); + if(FileNumber == 0 || FileNumber >= MCDwarfFiles.size()) + return false; + + return !MCDwarfFiles[FileNumber].Name.empty(); +} + +/// finalizeDwarfSections - Emit end symbols for each non-empty code section. +/// Also remove empty sections from SectionStartEndSyms, to avoid generating +/// useless debug info for them. +void MCContext::finalizeDwarfSections(MCStreamer &MCOS) { + MCContext &context = MCOS.getContext(); + + auto sec = SectionStartEndSyms.begin(); + while (sec != SectionStartEndSyms.end()) { + assert(sec->second.first && "Start symbol must be set by now"); + MCOS.SwitchSection(sec->first); + if (MCOS.mayHaveInstructions()) { + MCSymbol *SectionEndSym = context.CreateTempSymbol(); + MCOS.EmitLabel(SectionEndSym); + sec->second.second = SectionEndSym; + ++sec; + } else { + MapVector >::iterator + to_erase = sec; + sec = SectionStartEndSyms.erase(to_erase); + } + } +} + +void MCContext::FatalError(SMLoc Loc, const Twine &Msg) const { + // If we have a source manager and a location, use it. Otherwise just + // use the generic report_fatal_error(). + if (!SrcMgr || Loc == SMLoc()) + report_fatal_error(Msg, false); + + // Use the source manager to print the message. + SrcMgr->PrintMessage(Loc, SourceMgr::DK_Error, Msg); + + // If we reached here, we are failing ungracefully. Run the interrupt handlers + // to make sure any special cleanups get done, in particular that we remove + // files registered with RemoveFileOnSignal. + sys::RunInterruptHandlers(); + exit(1); +}