X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FMC%2FMCContext.cpp;h=1a7df6041e68652bdd543d825db67b0ade3c0d3b;hb=50e75bfc29269def44981ab5f109334d95f55007;hp=78d6a77dfb8aecbe203c10c28a60f2632420e945;hpb=1a5c28f4715d84d0302581a67e193d7a358bba17;p=oota-llvm.git diff --git a/lib/MC/MCContext.cpp b/lib/MC/MCContext.cpp index 78d6a77dfb8..1a7df6041e6 100644 --- a/lib/MC/MCContext.cpp +++ b/lib/MC/MCContext.cpp @@ -8,27 +8,143 @@ //===----------------------------------------------------------------------===// #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/MemoryBuffer.h" +#include "llvm/Support/Signals.h" +#include "llvm/Support/SourceMgr.h" using namespace llvm; -MCContext::MCContext(const MCAsmInfo &mai) : MAI(mai), NextUniqueID(0) { +typedef StringMap MachOUniqueMapTy; +typedef StringMap ELFUniqueMapTy; +typedef StringMap COFFUniqueMapTy; + + +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), + CompilationDir(llvm::sys::Path::GetCurrentDirectory().str()), + CurrentDwarfLoc(0,0,0,DWARF2_FLAG_IS_STMT,0,0), + DwarfLocSeen(false), GenDwarfForAssembly(false), GenDwarfFileNumber(0), + AllowTemporaryLabels(true), DwarfCompileUnitID(0), AutoReset(DoAutoReset) { + + MachOUniquingMap = 0; + ELFUniquingMap = 0; + COFFUniquingMap = 0; + + SecureLogFile = getenv("AS_SECURE_LOG_FILE"); + SecureLog = 0; + SecureLogUsed = false; + + if (SrcMgr && SrcMgr->getNumBuffers() > 0) + MainFileName = SrcMgr->getMemoryBuffer(0)->getBufferIdentifier(); + else + MainFileName = ""; } 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(); + MCDwarfFiles.clear(); + MCDwarfDirs.clear(); + MCGenDwarfLabelEntries.clear(); + DwarfDebugFlags = StringRef(); + MCLineSections.clear(); + MCLineSectionOrder.clear(); + DwarfCompileUnitID = 0; + MCLineTableSymbols.clear(); + CurrentDwarfLoc = MCDwarfLoc(0,0,0,DWARF2_FLAG_IS_STMT,0,0); + + // If we have the MachO uniquing map, free it. + delete (MachOUniqueMapTy*)MachOUniquingMap; + delete (ELFUniqueMapTy*)ELFUniquingMap; + delete (COFFUniqueMapTy*)COFFUniquingMap; + MachOUniquingMap = 0; + ELFUniquingMap = 0; + COFFUniquingMap = 0; + + 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) { @@ -37,26 +153,235 @@ MCSymbol *MCContext::GetOrCreateSymbol(const Twine &Name) { return GetOrCreateSymbol(NameSV.str()); } +MCSymbol *MCContext::CreateTempSymbol() { + SmallString<128> NameSV; + raw_svector_ostream(NameSV) + << MAI.getPrivateGlobalPrefix() << "tmp" << NextUniqueID++; + return CreateSymbol(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); +unsigned MCContext::NextInstance(int64_t LocalLabelVal) { + MCLabel *&Label = Instances[LocalLabelVal]; + if (!Label) + Label = new (*this) MCLabel(0); + return Label->incInstance(); } -MCSymbol *MCContext::GetOrCreateTemporarySymbol(const Twine &Name) { - SmallString<128> NameSV; - Name.toVector(NameSV); - return GetOrCreateTemporarySymbol(NameSV.str()); +unsigned MCContext::GetInstance(int64_t LocalLabelVal) { + MCLabel *&Label = Instances[LocalLabelVal]; + if (!Label) + Label = new (*this) MCLabel(0); + return Label->getInstance(); } +MCSymbol *MCContext::CreateDirectionalLocalSymbol(int64_t LocalLabelVal) { + return GetOrCreateSymbol(Twine(MAI.getPrivateGlobalPrefix()) + + Twine(LocalLabelVal) + + "\2" + + Twine(NextInstance(LocalLabelVal))); +} +MCSymbol *MCContext::GetDirectionalLocalSymbol(int64_t LocalLabelVal, + int bORf) { + return GetOrCreateSymbol(Twine(MAI.getPrivateGlobalPrefix()) + + Twine(LocalLabelVal) + + "\2" + + Twine(GetInstance(LocalLabelVal) + bORf)); +} 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. + + // Create the map if it doesn't already exist. + if (MachOUniquingMap == 0) + MachOUniquingMap = new MachOUniqueMapTy(); + MachOUniqueMapTy &Map = *(MachOUniqueMapTy*)MachOUniquingMap; + + // 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 = Map[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, ""); +} + +const MCSectionELF *MCContext:: +getELFSection(StringRef Section, unsigned Type, unsigned Flags, + SectionKind Kind, unsigned EntrySize, StringRef Group) { + if (ELFUniquingMap == 0) + ELFUniquingMap = new ELFUniqueMapTy(); + ELFUniqueMapTy &Map = *(ELFUniqueMapTy*)ELFUniquingMap; + + // Do the lookup, if we have a hit, return it. + StringMapEntry &Entry = Map.GetOrCreateValue(Section); + if (Entry.getValue()) return Entry.getValue(); + + // Possibly refine the entry size first. + if (!EntrySize) { + EntrySize = MCSectionELF::DetermineEntrySize(Kind); + } + + MCSymbol *GroupSym = NULL; + if (!Group.empty()) + GroupSym = GetOrCreateSymbol(Group); + + MCSectionELF *Result = new (*this) MCSectionELF(Entry.getKey(), Type, Flags, + Kind, EntrySize, GroupSym); + Entry.setValue(Result); + return Result; +} + +const MCSectionELF *MCContext::CreateELFGroupSection() { + MCSectionELF *Result = + new (*this) MCSectionELF(".group", ELF::SHT_GROUP, 0, + SectionKind::getReadOnly(), 4, NULL); + return Result; +} + +const MCSection *MCContext::getCOFFSection(StringRef Section, + unsigned Characteristics, + int Selection, + SectionKind Kind) { + if (COFFUniquingMap == 0) + COFFUniquingMap = new COFFUniqueMapTy(); + COFFUniqueMapTy &Map = *(COFFUniqueMapTy*)COFFUniquingMap; + + // Do the lookup, if we have a hit, return it. + StringMapEntry &Entry = Map.GetOrCreateValue(Section); + if (Entry.getValue()) return Entry.getValue(); + + MCSectionCOFF *Result = new (*this) MCSectionCOFF(Entry.getKey(), + Characteristics, + Selection, Kind); + + Entry.setValue(Result); + return Result; +} + +//===----------------------------------------------------------------------===// +// 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) { + // TODO: a FileNumber of zero says to use the next available file number. + // Note: in GenericAsmParser::ParseDirectiveFile() FileNumber was checked + // to not be less than one. This needs to be change to be not less than zero. + + // Make space for this FileNumber in the MCDwarfFiles vector if needed. + if (FileNumber >= MCDwarfFiles.size()) { + MCDwarfFiles.resize(FileNumber + 1); + } else { + MCDwarfFile *&ExistingFile = MCDwarfFiles[FileNumber]; + if (ExistingFile) + // It is an error to use see the same number more than once. + return 0; + } + + // Get the new MCDwarfFile slot for this FileNumber. + MCDwarfFile *&File = MCDwarfFiles[FileNumber]; + + if (Directory.empty()) { + // Separate the directory part from the basename of the FileName. + StringRef tFileName = sys::path::filename(FileName); + if (!tFileName.empty()) { + Directory = sys::path::parent_path(FileName); + if (!Directory.empty()) + FileName = tFileName; + } + } + + // Find or make a entry in the MCDwarfDirs vector for this Directory. + // Capture directory name. + unsigned DirIndex; + if (Directory.empty()) { + // For FileNames with no directories a DirIndex of 0 is used. + DirIndex = 0; + } else { + DirIndex = 0; + for (unsigned End = MCDwarfDirs.size(); DirIndex < End; DirIndex++) { + if (Directory == MCDwarfDirs[DirIndex]) + break; + } + if (DirIndex >= MCDwarfDirs.size()) { + char *Buf = static_cast(Allocate(Directory.size())); + memcpy(Buf, Directory.data(), Directory.size()); + MCDwarfDirs.push_back(StringRef(Buf, Directory.size())); + } + // The DirIndex is one based, as DirIndex of 0 is used for FileNames with + // no directories. MCDwarfDirs[] is unlike MCDwarfFiles[] in that the + // directory names are stored at MCDwarfDirs[DirIndex-1] where FileNames + // are stored at MCDwarfFiles[FileNumber].Name . + DirIndex++; + } + + // Now make the MCDwarfFile entry and place it in the slot in the MCDwarfFiles + // vector. + char *Buf = static_cast(Allocate(FileName.size())); + memcpy(Buf, FileName.data(), FileName.size()); + File = new (*this) MCDwarfFile(StringRef(Buf, FileName.size()), DirIndex); + + // return the allocated FileNumber. + return FileNumber; +} + +/// isValidDwarfFileNumber - takes a dwarf file number and returns true if it +/// currently is assigned and false otherwise. +bool MCContext::isValidDwarfFileNumber(unsigned FileNumber) { + if(FileNumber == 0 || FileNumber >= MCDwarfFiles.size()) + return false; + + return MCDwarfFiles[FileNumber] != 0; +} + +void MCContext::FatalError(SMLoc Loc, const Twine &Msg) { + // 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); + + // 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); +}