Add an assert.

[oota-llvm.git] / lib / MC / MCContext.cpp

diff --git a/lib/MC/MCContext.cpp b/lib/MC/MCContext.cpp
index 7470e8d0031c39e9c478441aaf55492ca849d13c..053639c517f9b76e1388497854a150b5896d0046 100644 (file)
--- a/lib/MC/MCContext.cpp
+++ b/lib/MC/MCContext.cpp
@@ -24,7 +24,8 @@ typedef StringMap<const MCSectionELF*> ELFUniqueMapTy;
 typedef StringMap<const MCSectionCOFF*> COFFUniqueMapTy;
 
 
-MCContext::MCContext(const MCAsmInfo &mai) : MAI(mai), NextUniqueID(0) {
+MCContext::MCContext(const MCAsmInfo &mai) : MAI(mai), NextUniqueID(0),
+                     CurrentDwarfLoc(0,0,0,DWARF2_FLAG_IS_STMT,0,0) {
   MachOUniquingMap = 0;
   ELFUniquingMap = 0;
   COFFUniquingMap = 0;
@@ -32,6 +33,8 @@ MCContext::MCContext(const MCAsmInfo &mai) : MAI(mai), NextUniqueID(0) {
   SecureLogFile = getenv("AS_SECURE_LOG_FILE");
   SecureLog = 0;
   SecureLogUsed = false;
+
+  DwarfLocSeen = false;
 }
 
 MCContext::~MCContext() {
@@ -145,10 +148,15 @@ getMachOSection(StringRef Segment, StringRef Section,
                                             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;
@@ -157,12 +165,28 @@ getELFSection(StringRef Section, unsigned Type, unsigned Flags,
   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, IsExplicit);
+                                                  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,
@@ -213,7 +237,6 @@ unsigned MCContext::GetDwarfFile(StringRef FileName, unsigned FileNumber) {
   std::pair<StringRef, StringRef> Slash = FileName.rsplit('/');
 
   // Find or make a entry in the MCDwarfDirs vector for this Directory.
-  StringRef Directory;
   StringRef Name;
   unsigned DirIndex;
   // Capture directory name.
@@ -221,24 +244,39 @@ unsigned MCContext::GetDwarfFile(StringRef FileName, unsigned FileNumber) {
     Name = Slash.first;
     DirIndex = 0; // For FileNames with no directories a DirIndex of 0 is used.
   } else {
-    Directory = Slash.first;
+    StringRef Directory = Slash.first;
     Name = Slash.second;
-    for (DirIndex = 1; DirIndex < MCDwarfDirs.size(); DirIndex++) {
-      std::string *&Dir = MCDwarfDirs[DirIndex];
-      if (Directory == *Dir)
-       break;
+    for (DirIndex = 0; DirIndex < MCDwarfDirs.size(); DirIndex++) {
+      if (Directory == MCDwarfDirs[DirIndex])
+        break;
     }
     if (DirIndex >= MCDwarfDirs.size()) {
-      MCDwarfDirs.resize(DirIndex + 1);
-      std::string *&NewDir = MCDwarfDirs[DirIndex];
-      NewDir = new (*this) std::string(Directory);
+      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.
-  File = new (*this) MCDwarfFile(Name, DirIndex);
+  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;
+}