1 files changed, 265 insertions, 0 deletions
diff --git a/contrib/llvm/lib/MC/MCContext.cpp b/contrib/llvm/lib/MC/MCContext.cpp
new file mode 100644
index 0000000..e5586a0
--- /dev/null
+++ b/contrib/llvm/lib/MC/MCContext.cpp
@@ -0,0 +1,265 @@
+//===- lib/MC/MCContext.cpp - Machine Code Context ------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/MC/MCContext.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;
+
+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) {
+  MachOUniquingMap = 0;
+  ELFUniquingMap = 0;
+  COFFUniquingMap = 0;
+
+  SecureLogFile = getenv("AS_SECURE_LOG_FILE");
+  SecureLog = 0;
+  SecureLogUsed = false;
+
+  DwarfLocSeen = false;
+}
+
+MCContext::~MCContext() {
+  // 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!");
+  
+  // 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();
+
+  // 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) {
+  SmallString<128> NameSV;
+  Name.toVector(NameSV);
+  return GetOrCreateSymbol(NameSV.str());
+}
+
+MCSymbol *MCContext::CreateTempSymbol() {
+  return GetOrCreateSymbol(Twine(MAI.getPrivateGlobalPrefix()) +
+                           "tmp" + Twine(NextUniqueID++));
+}
+
+unsigned MCContext::NextInstance(int64_t LocalLabelVal) {
+  MCLabel *&Label = Instances[LocalLabelVal];
+  if (!Label)
+    Label = new (*this) MCLabel(0);
+  return Label->incInstance();
+}
+
+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 MCSection *MCContext::
+getELFSection(StringRef Section, unsigned Type, unsigned Flags,
+              SectionKind Kind, bool IsExplicit, unsigned EntrySize) {
+  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();
+  
+  MCSectionELF *Result = new (*this) MCSectionELF(Entry.getKey(), Type, Flags,
+                                                  Kind, IsExplicit, EntrySize);
+  Entry.setValue(Result);
+  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;
+}
+
+/// ValidateDwarfFileNumber - takes a dwarf file number and returns true if it
+/// currently is assigned and false otherwise.
+bool MCContext::ValidateDwarfFileNumber(unsigned FileNumber) {
+  if(FileNumber == 0 || FileNumber >= MCDwarfFiles.size())
+    return false;
+
+  MCDwarfFile *&ExistingFile = MCDwarfFiles[FileNumber];
+  if (ExistingFile)
+    return true;
+  else
+    return false;
+}