X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FMC%2FMCContext.cpp;h=3b45d1670d2c6440e112fc9a1b931635823d5974;hb=6079f00035e029f12e4be0281aa2cbfbb4817141;hp=11370642530a1947e8a8ca127dae9540b62cacfe;hpb=3472766f9eb7d66f234c390ce1b3a8b76f0ee9ce;p=oota-llvm.git diff --git a/lib/MC/MCContext.cpp b/lib/MC/MCContext.cpp index 11370642530..3b45d1670d2 100644 --- a/lib/MC/MCContext.cpp +++ b/lib/MC/MCContext.cpp @@ -8,22 +8,48 @@ //===----------------------------------------------------------------------===// #include "llvm/MC/MCContext.h" +#include "llvm/ADT/SmallString.h" +#include "llvm/ADT/Twine.h" #include "llvm/MC/MCAsmInfo.h" -#include "llvm/MC/MCSectionMachO.h" -#include "llvm/MC/MCSectionELF.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/MC/MCLabel.h" -#include "llvm/ADT/SmallString.h" -#include "llvm/ADT/Twine.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; +typedef std::pair SectionGroupPair; + typedef StringMap MachOUniqueMapTy; -typedef StringMap ELFUniqueMapTy; -typedef StringMap COFFUniqueMapTy; +typedef std::map ELFUniqueMapTy; +typedef std::map 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), + CurrentDwarfLoc(0,0,0,DWARF2_FLAG_IS_STMT,0,0), + DwarfLocSeen(false), GenDwarfForAssembly(false), GenDwarfFileNumber(0), + AllowTemporaryLabels(true), DwarfCompileUnitID(0), AutoReset(DoAutoReset) { + + error_code EC = llvm::sys::fs::current_path(CompilationDir); + assert(!EC && "Could not determine the current directory"); + (void)EC; -MCContext::MCContext(const MCAsmInfo &mai) : MAI(mai), NextUniqueID(0) { MachOUniquingMap = 0; ELFUniquingMap = 0; COFFUniquingMap = 0; @@ -31,19 +57,57 @@ MCContext::MCContext(const MCAsmInfo &mai) : MAI(mai), NextUniqueID(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() { + + 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(); + MCDwarfFilesCUMap.clear(); + MCDwarfDirsCUMap.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; - // If the stream for the .secure_log_unique directive was created free it. - delete (raw_ostream*)SecureLog; + NextUniqueID = 0; + AllowTemporaryLabels = true; + DwarfLocSeen = false; + GenDwarfForAssembly = false; + GenDwarfFileNumber = 0; } //===----------------------------------------------------------------------===// @@ -52,20 +116,43 @@ MCContext::~MCContext() { MCSymbol *MCContext::GetOrCreateSymbol(StringRef Name) { assert(!Name.empty() && "Normal symbols cannot be unnamed!"); - - // Determine whether this is an assembler temporary or normal label. - bool isTemporary = Name.startswith(MAI.getPrivateGlobalPrefix()); - + // 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); - if (Entry.getValue()) return Entry.getValue(); + 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 StringMapEntry. - MCSymbol *Result = new (*this) MCSymbol(Entry.getKey(), isTemporary); - Entry.setValue(Result); - return Result; + // 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) { @@ -75,8 +162,10 @@ MCSymbol *MCContext::GetOrCreateSymbol(const Twine &Name) { } MCSymbol *MCContext::CreateTempSymbol() { - return GetOrCreateSymbol(Twine(MAI.getPrivateGlobalPrefix()) + - "tmp" + Twine(NextUniqueID++)); + SmallString<128> NameSV; + raw_svector_ostream(NameSV) + << MAI->getPrivateGlobalPrefix() << "tmp" << NextUniqueID++; + return CreateSymbol(NameSV); } unsigned MCContext::NextInstance(int64_t LocalLabelVal) { @@ -94,14 +183,14 @@ unsigned MCContext::GetInstance(int64_t LocalLabelVal) { } MCSymbol *MCContext::CreateDirectionalLocalSymbol(int64_t LocalLabelVal) { - return GetOrCreateSymbol(Twine(MAI.getPrivateGlobalPrefix()) + + return GetOrCreateSymbol(Twine(MAI->getPrivateGlobalPrefix()) + Twine(LocalLabelVal) + "\2" + Twine(NextInstance(LocalLabelVal))); } MCSymbol *MCContext::GetDirectionalLocalSymbol(int64_t LocalLabelVal, int bORf) { - return GetOrCreateSymbol(Twine(MAI.getPrivateGlobalPrefix()) + + return GetOrCreateSymbol(Twine(MAI->getPrivateGlobalPrefix()) + Twine(LocalLabelVal) + "\2" + Twine(GetInstance(LocalLabelVal) + bORf)); @@ -111,6 +200,12 @@ 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 //===----------------------------------------------------------------------===// @@ -119,65 +214,213 @@ 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 MCSection *MCContext:: +const MCSectionELF *MCContext:: getELFSection(StringRef Section, unsigned Type, unsigned Flags, - SectionKind Kind, bool IsExplicit) { + 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(); - - MCSectionELF *Result = new (*this) MCSectionELF(Entry.getKey(), Type, Flags, - Kind, IsExplicit); - Entry.setValue(Result); + std::pair Entry = Map.insert( + std::make_pair(SectionGroupPair(Section, Group), (MCSectionELF *)0)); + if (!Entry.second) return Entry.first->second; + + // 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.first->first.first, Type, Flags, Kind, EntrySize, GroupSym); + Entry.first->second = Result; return Result; } -const MCSection *MCContext::getCOFFSection(StringRef Section, - unsigned Characteristics, - int Selection, - SectionKind Kind) { +const MCSectionELF *MCContext::CreateELFGroupSection() { + MCSectionELF *Result = + new (*this) MCSectionELF(".group", ELF::SHT_GROUP, 0, + SectionKind::getReadOnly(), 4, NULL); + return Result; +} + +const MCSectionCOFF * +MCContext::getCOFFSection(StringRef Section, unsigned Characteristics, + SectionKind Kind, StringRef COMDATSymName, + int Selection, const MCSectionCOFF *Assoc) { 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); + + SectionGroupPair P(Section, COMDATSymName); + std::pair Entry = + Map.insert(std::make_pair(P, (MCSectionCOFF *)0)); + COFFUniqueMapTy::iterator Iter = Entry.first; + if (!Entry.second) + return Iter->second; + + const MCSymbol *COMDATSymbol = NULL; + if (!COMDATSymName.empty()) + COMDATSymbol = GetOrCreateSymbol(COMDATSymName); + + MCSectionCOFF *Result = + new (*this) MCSectionCOFF(Iter->first.first, Characteristics, + COMDATSymbol, Selection, Assoc, 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) { + if (COFFUniquingMap == 0) + COFFUniquingMap = new COFFUniqueMapTy(); + COFFUniqueMapTy &Map = *(COFFUniqueMapTy*)COFFUniquingMap; + + SectionGroupPair P(Section, ""); + COFFUniqueMapTy::iterator Iter = Map.find(P); + if (Iter == Map.end()) + return 0; + 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) { + // 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. + + SmallVectorImpl& MCDwarfFiles = MCDwarfFilesCUMap[CUID]; + SmallVectorImpl& MCDwarfDirs = MCDwarfDirsCUMap[CUID]; + // 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, unsigned CUID) { + SmallVectorImpl& MCDwarfFiles = MCDwarfFilesCUMap[CUID]; + 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); +}