llvm-nm should show a symbol type of T for symbols in the (__TEXT_EXE…

…C,__text) section.

When a the Apple link editor builds a kext bundle file type and the 
value of the -miphoneos-version-min argument is significantly current
(like 11.0) then the (__TEXT,__text) section is changed to the
(__TEXT_EXEC,__text) section.  So it would be nice for llvm-nm to
show symbols in that section with a type of T instead of the generic
type of S for some section other than text, data, etc.

rdar://36262205


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@323836 91177308-0d34-0410-b5e6-96231b3b80d8

test/tools/llvm-nm/AArch64/lit.local.cfg

@@ -0,0 +1,2 @@
+if not 'AArch64' in config.root.targets:
+    config.unsupported = True

test/tools/llvm-nm/AArch64/macho-kextbundle.test

@@ -0,0 +1,4 @@
+RUN: llvm-nm %p/Inputs/kextbundle.macho-aarch64 | FileCheck %s
+
+CHECK: 0000000000004014 s _bar.stub
+CHECK: 0000000000004000 T _foo

tools/llvm-nm/llvm-nm.cpp

@@ -1004,6 +1004,10 @@ static char getSymbolNMTypeChar(MachOObjectFile &Obj, basic_symbol_iterator I) {
     StringRef SectionName;
     Obj.getSectionName(Ref, SectionName);
     StringRef SegmentName = Obj.getSectionFinalSegmentName(Ref);
+    if (Obj.is64Bit() && 
+        Obj.getHeader64().filetype == MachO::MH_KEXT_BUNDLE &&
+        SegmentName == "__TEXT_EXEC" && SectionName == "__text")
+      return 't';
     if (SegmentName == "__TEXT" && SectionName == "__text")
       return 't';
     if (SegmentName == "__DATA" && SectionName == "__data")