Add r170095 back.

I cannot reproduce it the failures locally, so I will keep an eye at the ppc
bots. This patch does add the change to the "Disassembly of section" message,
but that is not what was failing on the bots.

Original message:

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

On MachO, sections also have segment names. When a tool looking at a .o file
prints a segment name, this is what they mean. In reality, a .o has only one
anonymous, segment.

This patch adds a MachO only function to fetch that segment name. I named it
getSectionFinalSegmentName since the main use for the name seems to be infor
the linker with segment this section should go to.

The patch also changes MachOObjectFile::getSectionName to return just the
section name instead of computing SegmentName,SectionName.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@170545 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 25 insertions, 10 deletions

diff --git a/lib/Object/MachOObjectFile.cpp b/lib/Object/MachOObjectFile.cpp
index 40f5390..3e29b2f 100644
--- a/lib/Object/MachOObjectFile.cpp
+++ b/lib/Object/MachOObjectFile.cpp
@@ -473,28 +473,43 @@ 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);
-
-    strcpy(result, Sect->SegmentName);
-    strcat(result, ",");
-    strcat(result, Sect->Name);
+    Result = parseSegmentOrSectionName(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;
+}
 
-    strcpy(result, Sect->SegmentName);
-    strcat(result, ",");
-    strcat(result, Sect->Name);
+error_code MachOObjectFile::getSectionFinalSegmentName(DataRefImpl Sec,
+                                                       StringRef &Res) const {
+  if (is64BitLoadCommand(MachOObj.get(), Sec)) {
+    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;
 }