llvm-nm: Don't print mapping symbols.

This matches the behavior of gnu nm. Fixes pr23930.

llvm-svn: 240695

2 files changed, 20 insertions, 0 deletions

diff --git a/llvm/include/llvm/Object/ELFObjectFile.h b/llvm/include/llvm/Object/ELFObjectFile.h
index 8ecfa71ff2e..9ace1b06a65 100644
--- a/llvm/include/llvm/Object/ELFObjectFile.h
+++ b/llvm/include/llvm/Object/ELFObjectFile.h
@@ -394,6 +394,15 @@ uint32_t ELFObjectFile<ELFT>::getSymbolFlags(DataRefImpl Symb) const {
       EIter == EF.begin_symbols() || EIter == EF.begin_dynamic_symbols())
     Result |= SymbolRef::SF_FormatSpecific;
 
+  if (EF.getHeader()->e_machine == ELF::EM_ARM) {
+    if (ErrorOr<StringRef> NameOrErr = EF.getSymbolName(EIter)) {
+      StringRef Name = *NameOrErr;
+      if (Name.startswith("$d") || Name.startswith("$t") ||
+          Name.startswith("$a"))
+        Result |= SymbolRef::SF_FormatSpecific;
+    }
+  }
+
   if (ESym->st_shndx == ELF::SHN_UNDEF)
     Result |= SymbolRef::SF_Undefined;
 
diff --git a/llvm/test/Object/ARM/nm-mapping-symbol.s b/llvm/test/Object/ARM/nm-mapping-symbol.s
new file mode 100644
index 00000000000..485c1cc39d7
--- /dev/null
+++ b/llvm/test/Object/ARM/nm-mapping-symbol.s
@@ -0,0 +1,11 @@
+// RUN: llvm-mc %s -o %t.o -filetype=obj -triple=armv7-pc-linux
+// RUN: llvm-readobj -t %t.o | FileCheck %s
+// RUN: llvm-nm %t.o | FileCheck -allow-empty --check-prefix=NM %s
+
+// Test that nm doesn't print the mapping symbols
+
+// CHECK: Name: $d.0
+// NM-NOT: $d.0
+
+        .section        .foobar,"",%progbits
+        .asciz  "foo"