ARM: Enable use of relocation type tlsldo in debug info for tls data.

This fixes PR18554.

Reviewers: Renato Golin, Keith Walker


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200826 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/ARM/ARMTargetObjectFile.cpp

@@ -51,3 +51,9 @@ getTTypeGlobalReference(const GlobalValue *GV, Mangler *Mang,
                                  MCSymbolRefExpr::VK_ARM_TARGET2,
                                  getContext());
 }
+
+const MCExpr *ARMElfTargetObjectFile::
+getDebugThreadLocalSymbol(const MCSymbol *Sym) const {
+  return MCSymbolRefExpr::Create(Sym, MCSymbolRefExpr::VK_ARM_TLSLDO,
+                                 getContext());
+}

lib/Target/ARM/ARMTargetObjectFile.h

@@ -36,6 +36,9 @@ class ARMElfTargetObjectFile : public TargetLoweringObjectFileELF {
   virtual const MCSection *getAttributesSection() const {
     return AttributesSection;
   }
+
+  /// \brief Describe a TLS variable address within debug info.
+  virtual const MCExpr *getDebugThreadLocalSymbol(const MCSymbol *Sym) const;
 };
 
 } // end namespace llvm

test/DebugInfo/ARM/tls.ll

@@ -0,0 +1,28 @@
+; RUN: llc -O0 -filetype=asm -mtriple=armv7-linux-gnuehabi < %s | FileCheck %s
+;
+; Generated with clang with source
+; __thread int x;
+
+@x = thread_local global i32 0, align 4
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!7, !8}
+!llvm.ident = !{!9}
+
+; 6 byte of data
+; CHECK: .byte 6 @ DW_AT_location
+; DW_OP_const4u
+; CHECK: .byte 12
+; The debug relocation of the address of the tls variable
+; CHECK: .long x(tlsldo)
+
+!0 = metadata !{i32 786449, metadata !1, i32 12, metadata !"clang version 3.5 ", i1 false, metadata !"", i32 0, metadata !2, metadata !2, metadata !2, metadata !3, metadata !2, metadata !""} ; [ DW_TAG_compile_unit ] [/tmp/tls.c] [DW_LANG_C99]
+!1 = metadata !{metadata !"tls.c", metadata !"/tmp"}
+!2 = metadata !{}
+!3 = metadata !{metadata !4}
+!4 = metadata !{i32 786484, i32 0, null, metadata !"x", metadata !"x", metadata !"", metadata !5, i32 1, metadata !6, i32 0, i32 1, i32* @x, null} ; [ DW_TAG_variable ] [x] [line 1] [def]
+!5 = metadata !{i32 786473, metadata !1}          ; [ DW_TAG_file_type ] [/tmp/tls.c]
+!6 = metadata !{i32 786468, null, null, metadata !"int", i32 0, i64 32, i64 32, i64 0, i32 0, i32 5} ; [ DW_TAG_base_type ] [int] [line 0, size 32, align 32, offset 0, enc DW_ATE_signed]
+!7 = metadata !{i32 2, metadata !"Dwarf Version", i32 4}
+!8 = metadata !{i32 1, metadata !"Debug Info Version", i32 1}
+!9 = metadata !{metadata !"clang version 3.5 "}