//===----------------------------------------------------------------------===//
#include "llvm/MC/MCContext.h"
-#include "llvm/MC/MCSection.h"
+#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/MC/MCSectionMachO.h"
+#include "llvm/MC/MCSectionELF.h"
+#include "llvm/MC/MCSectionCOFF.h"
#include "llvm/MC/MCSymbol.h"
+#include "llvm/MC/MCLabel.h"
+#include "llvm/MC/MCDwarf.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/Twine.h"
using namespace llvm;
-MCContext::MCContext() {
+typedef StringMap<const MCSectionMachO*> MachOUniqueMapTy;
+typedef StringMap<const MCSectionELF*> ELFUniqueMapTy;
+typedef StringMap<const MCSectionCOFF*> COFFUniqueMapTy;
+
+
+MCContext::MCContext(const MCAsmInfo &mai) : MAI(mai), NextUniqueID(0),
+ CurrentDwarfLoc(0,0,0,0,0,0) {
+ MachOUniquingMap = 0;
+ ELFUniquingMap = 0;
+ COFFUniquingMap = 0;
+
+ SecureLogFile = getenv("AS_SECURE_LOG_FILE");
+ SecureLog = 0;
+ SecureLogUsed = false;
+
+ DwarfLocSeen = false;
}
MCContext::~MCContext() {
- // NOTE: The sections are all allocated out of a bump pointer allocator,
+ // NOTE: The symbols are all allocated out of a bump pointer allocator,
// we don't need to free them here.
+
+ // If we have the MachO uniquing map, free it.
+ delete (MachOUniqueMapTy*)MachOUniquingMap;
+ delete (ELFUniqueMapTy*)ELFUniquingMap;
+ delete (COFFUniqueMapTy*)COFFUniquingMap;
+
+ // If the stream for the .secure_log_unique directive was created free it.
+ delete (raw_ostream*)SecureLog;
}
+//===----------------------------------------------------------------------===//
+// Symbol Manipulation
+//===----------------------------------------------------------------------===//
+
MCSymbol *MCContext::GetOrCreateSymbol(StringRef Name) {
assert(!Name.empty() && "Normal symbols cannot be unnamed!");
- MCSymbol *&Entry = Symbols[Name];
- if (Entry) return Entry;
+
+ // 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<MCSymbol*> &Entry = Symbols.GetOrCreateValue(Name);
+ if (Entry.getValue()) return Entry.getValue();
- return Entry = new (*this) MCSymbol(Name, false);
+ // 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;
}
MCSymbol *MCContext::GetOrCreateSymbol(const Twine &Name) {
return GetOrCreateSymbol(NameSV.str());
}
+MCSymbol *MCContext::CreateTempSymbol() {
+ return GetOrCreateSymbol(Twine(MAI.getPrivateGlobalPrefix()) +
+ "tmp" + Twine(NextUniqueID++));
+}
-MCSymbol *MCContext::GetOrCreateTemporarySymbol(StringRef Name) {
- // 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);
}
+
+//===----------------------------------------------------------------------===//
+// 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<const MCSectionELF*> &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", MCSectionELF::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<const MCSectionCOFF*> &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 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];
+
+ // Separate the directory part from the basename of the FileName.
+ std::pair<StringRef, StringRef> Slash = FileName.rsplit('/');
+
+ // Find or make a entry in the MCDwarfDirs vector for this Directory.
+ StringRef Name;
+ unsigned DirIndex;
+ // Capture directory name.
+ if (Slash.second.empty()) {
+ Name = Slash.first;
+ DirIndex = 0; // For FileNames with no directories a DirIndex of 0 is used.
+ } else {
+ StringRef Directory = Slash.first;
+ Name = Slash.second;
+ for (DirIndex = 0; DirIndex < MCDwarfDirs.size(); 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++;
+ }
+
+ // Now make the MCDwarfFile entry and place it in the slot in the MCDwarfFiles
+ // vector.
+ char *Buf = static_cast<char *>(Allocate(Name.size()));
+ memcpy(Buf, Name.data(), Name.size());
+ File = new (*this) MCDwarfFile(StringRef(Buf, Name.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;
+}
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