Revert "Add a funciton to get the segment name of a section."

This reverts commit r170095 since it appears to be breaking the bots.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@170105 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Object/MachO.h

@@ -44,11 +44,6 @@ public:
   virtual unsigned getArch() const;
   virtual StringRef getLoadName() const;
 
-  // In a MachO file, sections have a segment name. This is used in the .o
-  // files. They have a single segment, but this field specifies which segment
-  // a section should be put in in the final object.
-  error_code getSectionFinalSegmentName(DataRefImpl Sec, StringRef &Res) const;
-
   MachOObject *getObject() { return MachOObj.get(); }
 
   static inline bool classof(const Binary *v) {

lib/Object/MachOObjectFile.cpp

@@ -473,43 +473,28 @@ static bool is64BitLoadCommand(const MachOObject *MachOObj, DataRefImpl DRI) {
   return false;
 }
 
-static StringRef parseSegmentOrSectionName(const char *P) {
-  if (P[15] == 0)
-    // Null terminated.
-    return P;
-  // Not null terminated, so this is a 16 char string.
-  return StringRef(P, 16);
-}
-
 error_code MachOObjectFile::getSectionName(DataRefImpl DRI,
                                            StringRef &Result) const {
+  // FIXME: thread safety.
+  static char result[34];
   if (is64BitLoadCommand(MachOObj.get(), DRI)) {
     LoadCommandInfo LCI = MachOObj->getLoadCommandInfo(DRI.d.a);
     InMemoryStruct<macho::Section64> Sect;
     MachOObj->ReadSection64(LCI, DRI.d.b, Sect);
-    Result = parseSegmentOrSectionName(Sect->Name);
+
+    strcpy(result, Sect->SegmentName);
+    strcat(result, ",");
+    strcat(result, Sect->Name);
   } else {
     LoadCommandInfo LCI = MachOObj->getLoadCommandInfo(DRI.d.a);
     InMemoryStruct<macho::Section> Sect;
     MachOObj->ReadSection(LCI, DRI.d.b, Sect);
-    Result = parseSegmentOrSectionName(Sect->Name);
-  }
-  return object_error::success;
-}
 
-error_code MachOObjectFile::getSectionFinalSegmentName(DataRefImpl Sec,
+    strcpy(result, Sect->SegmentName);
-                                                       StringRef &Res) const {
+    strcat(result, ",");
-  if (is64BitLoadCommand(MachOObj.get(), Sec)) {
+    strcat(result, Sect->Name);
-    LoadCommandInfo LCI = MachOObj->getLoadCommandInfo(Sec.d.a);
-    InMemoryStruct<macho::Section64> Sect;
-    MachOObj->ReadSection64(LCI, Sec.d.b, Sect);
-    Res = parseSegmentOrSectionName(Sect->SegmentName);
-  } else {
-    LoadCommandInfo LCI = MachOObj->getLoadCommandInfo(Sec.d.a);
-    InMemoryStruct<macho::Section> Sect;
-    MachOObj->ReadSection(LCI, Sec.d.b, Sect);
-    Res = parseSegmentOrSectionName(Sect->SegmentName);
   }
+  Result = StringRef(result);
   return object_error::success;
 }
 

tools/llvm-objdump/MachODump.cpp

@@ -334,15 +334,9 @@ void llvm::DisassembleInputMachO(StringRef Filename) {
   for (unsigned SectIdx = 0; SectIdx != Sections.size(); SectIdx++) {
     StringRef SectName;
     if (Sections[SectIdx].getName(SectName) ||
-        SectName != "__text")
+        SectName.compare("__TEXT,__text"))
       continue; // Skip non-text sections
 
-    StringRef SegmentName;
-    DataRefImpl DR = Sections[SectIdx].getRawDataRefImpl();
-    if (MachOOF->getSectionFinalSegmentName(DR, SegmentName) ||
-        SegmentName != "__TEXT")
-      continue;
-
     // Insert the functions from the function starts segment into our map.
     uint64_t VMAddr;
     Sections[SectIdx].getAddress(VMAddr);

tools/llvm-objdump/llvm-objdump.cpp

@@ -28,7 +28,6 @@
 #include "llvm/MC/MCSubtargetInfo.h"
 #include "llvm/Object/Archive.h"
 #include "llvm/Object/COFF.h"
-#include "llvm/Object/MachO.h"
 #include "llvm/Object/ObjectFile.h"
 #include "llvm/Support/Casting.h"
 #include "llvm/Support/CommandLine.h"
@@ -73,9 +72,9 @@ static cl::opt<bool>
 SymbolTable("t", cl::desc("Display the symbol table"));
 
 static cl::opt<bool>
-MachOOpt("macho", cl::desc("Use MachO specific object file parser"));
+MachO("macho", cl::desc("Use MachO specific object file parser"));
 static cl::alias
-MachOm("m", cl::desc("Alias for --macho"), cl::aliasopt(MachOOpt));
+MachOm("m", cl::desc("Alias for --macho"), cl::aliasopt(MachO));
 
 cl::opt<std::string>
 llvm::TripleName("triple", cl::desc("Target triple to disassemble for, "
@@ -568,13 +567,6 @@ static void PrintSymbolTable(const ObjectFile *o) {
       else if (Section == o->end_sections())
         outs() << "*UND*";
       else {
-        if (const MachOObjectFile *MachO = dyn_cast<const MachOObjectFile>(o)) {
-          StringRef SegmentName;
-          DataRefImpl DR = Section->getRawDataRefImpl();
-          if (error(MachO->getSectionFinalSegmentName(DR, SegmentName)))
-            SegmentName = "";
-          outs() << SegmentName << ",";
-        }
         StringRef SectionName;
         if (error(Section->getName(SectionName)))
           SectionName = "";
@@ -648,7 +640,7 @@ static void DumpInput(StringRef file) {
     return;
   }
 
-  if (MachOOpt && Disassemble) {
+  if (MachO && Disassemble) {
     DisassembleInputMachO(file);
     return;
   }