//===----------------------------------------------------------------------===//
#include "llvm/MC/MCContext.h"
-#include "llvm/MC/MCSection.h"
-#include "llvm/MC/MCSymbol.h"
-#include "llvm/MC/MCValue.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 <map>
+
using namespace llvm;
-MCContext::MCContext() {
+typedef std::pair<std::string, std::string> SectionGroupPair;
+
+typedef StringMap<const MCSectionMachO*> MachOUniqueMapTy;
+typedef std::map<SectionGroupPair, const MCSectionELF *> ELFUniqueMapTy;
+typedef std::map<SectionGroupPair, const MCSectionCOFF *> 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);
+ if (EC)
+ CompilationDir.clear();
+
+ 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;
}
-MCSymbol *MCContext::CreateSymbol(StringRef Name) {
- assert(Name[0] != '\0' && "Normal symbols cannot be unnamed!");
+//===----------------------------------------------------------------------===//
+// Module Lifetime Management
+//===----------------------------------------------------------------------===//
- // Create and bind the symbol, and ensure that names are unique.
- MCSymbol *&Entry = Symbols[Name];
- assert(!Entry && "Duplicate symbol definition!");
- return Entry = new (*this) MCSymbol(Name, false);
+void MCContext::reset() {
+ UsedNames.clear();
+ Symbols.clear();
+ Allocator.Reset();
+ Instances.clear();
+ MCDwarfFileTablesCUMap.clear();
+ MCGenDwarfLabelEntries.clear();
+ DwarfDebugFlags = StringRef();
+ DwarfCompileUnitID = 0;
+ 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) {
- MCSymbol *&Entry = Symbols[Name];
- if (Entry) return Entry;
+ assert(!Name.empty() && "Normal symbols cannot be unnamed!");
+
+ // Do the lookup and get the entire StringMapEntry. We want access to the
+ // key if we are creating the entry.
+ StringMapEntry<MCSymbol*> &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());
- return Entry = new (*this) MCSymbol(Name, false);
+ StringMapEntry<bool> *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::CreateTempSymbol() {
+ SmallString<128> NameSV;
+ 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::CreateTemporarySymbol(StringRef Name) {
- // If unnamed, just create a symbol.
- if (Name.empty())
- new (*this) MCSymbol("", true);
-
- // Otherwise create as usual.
- MCSymbol *&Entry = Symbols[Name];
- assert(!Entry && "Duplicate symbol definition!");
- return Entry = new (*this) MCSymbol(Name, true);
+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.
+
+ // 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.
+ std::pair<ELFUniqueMapTy::iterator, bool> 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 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.
+
+ SectionGroupPair P(Section, COMDATSymName);
+ std::pair<COFFUniqueMapTy::iterator, bool> 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) {
+ MCDwarfFileTable &Table = MCDwarfFileTablesCUMap[CUID];
+ SmallVectorImpl<MCDwarfFile>& MCDwarfFiles = Table.getMCDwarfFiles();
+ SmallVectorImpl<StringRef>& MCDwarfDirs = Table.getMCDwarfDirs();
+ // Make space for this FileNumber in the MCDwarfFiles vector if needed.
+ if (FileNumber >= MCDwarfFiles.size()) {
+ MCDwarfFiles.resize(FileNumber + 1);
+ }
+
+ // Get the new MCDwarfFile slot for this FileNumber.
+ MCDwarfFile &File = MCDwarfFiles[FileNumber];
+
+ // It is an error to use see the same number more than once.
+ if (!File.Name.empty())
+ return 0;
+
+ 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 an 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<char *>(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++;
+ }
+
+ File.Name = FileName;
+ File.DirIndex = 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) {
+ const SmallVectorImpl<MCDwarfFile>& MCDwarfFiles = getMCDwarfFiles(CUID);
+ if(FileNumber == 0 || FileNumber >= MCDwarfFiles.size())
+ return false;
+
+ return !MCDwarfFiles[FileNumber].Name.empty();
+}
+
+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);
+}
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