1. ARM/MC/ELF: A few more ELF relocs for .o

2. Fixed EmitLocalCommonSymbol for ELF (Yes, they exist. :)
   Test added.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121951 91177308-0d34-0410-b5e6-96231b3b80d8

lib/MC/ELFObjectWriter.cpp

@@ -1565,8 +1565,12 @@ unsigned ARMELFObjectWriter::GetRelocType(const MCValue &Target,
         Type = ELF::R_ARM_GOT_BREL; break;
       case MCSymbolRefExpr::VK_ARM_TLSGD:
         Type = ELF::R_ARM_TLS_GD32; break;
+      case MCSymbolRefExpr::VK_ARM_TPOFF:
+        Type = ELF::R_ARM_TLS_LE32; break;
       case MCSymbolRefExpr::VK_ARM_GOTTPOFF:
         Type = ELF::R_ARM_TLS_IE32; break;
+      case MCSymbolRefExpr::VK_None:
+        Type = ELF::R_ARM_ABS32; break;
       case MCSymbolRefExpr::VK_ARM_GOTOFF:
         Type = ELF::R_ARM_GOTOFF32; break;
       } break;
@@ -1579,6 +1583,8 @@ unsigned ARMELFObjectWriter::GetRelocType(const MCValue &Target,
     case ARM::fixup_arm_thumb_br:
       assert(0 && "Unimplemented"); break;
     case ARM::fixup_arm_branch:
+      // FIXME: Differentiate between R_ARM_CALL and
+      // R_ARM_JUMP24 (latter used for conditional jumps)
       Type = ELF::R_ARM_CALL; break;
     case ARM::fixup_arm_movt_hi16: 
       Type = ELF::R_ARM_MOVT_ABS; break;

lib/MC/MCELFStreamer.cpp

@@ -113,9 +113,8 @@ public:
      SD.setSize(Value);
   }
 
-  virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size) {
+  virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size);
-    assert(0 && "ELF doesn't support this directive");
+
-  }
   virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol = 0,
                             unsigned Size = 0, unsigned ByteAlignment = 0) {
     assert(0 && "ELF doesn't support this directive");
@@ -362,6 +361,16 @@ void MCELFStreamer::EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
   SD.setSize(MCConstantExpr::Create(Size, getContext()));
 }
 
+void MCELFStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size) {
+  // FIXME: Should this be caught and done earlier?
+  MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
+  SetBinding(SD, ELF::STB_LOCAL);
+  SD.setExternal(false);
+  BindingExplicitlySet.insert(Symbol);
+  // FIXME: ByteAlignment is not needed here, but is required.
+  EmitCommonSymbol(Symbol, Size, 1);
+}
+
 void MCELFStreamer::EmitBytes(StringRef Data, unsigned AddrSpace) {
   // TODO: This is exactly the same as WinCOFFStreamer. Consider merging into
   // MCObjectStreamer.

test/CodeGen/ARM/2010-12-15-elf-lcomm.ll

@@ -0,0 +1,35 @@
+; RUN: llc  %s -mtriple=armv7-linux-gnueabi -arm-use-movt -filetype=obj -o - | \
+; RUN:    elf-dump --dump-section-data | FileCheck  -check-prefix=OBJ %s
+; RUN: llc  %s -mtriple=armv7-linux-gnueabi -arm-use-movt -o - | \
+; RUN:    FileCheck  -check-prefix=ASM %s
+
+
+@dummy = internal global i32 666
+@array00 = internal global [20 x i32] zeroinitializer
+@sum = internal global i32 55
+@STRIDE = internal global i32 8
+
+; ASM:          .type   array00,%object         @ @array00
+; ASM-NEXT:     .lcomm  array00,80              @ @array00
+; ASM-NEXT:     .type   _MergedGlobals,%object  @ @_MergedGlobals
+
+
+
+; OBJ:          Section 0x00000003
+; OBJ-NEXT:     '.bss'
+
+; OBJ:          'array00'
+; OBJ-NEXT:     'st_value', 0x00000000
+; OBJ-NEXT:     'st_size', 0x00000050
+; OBJ-NEXT:     'st_bind', 0x00000000
+; OBJ-NEXT:     'st_type', 0x00000001
+; OBJ-NEXT:     'st_other', 0x00000000
+; OBJ-NEXT:     'st_shndx', 0x00000003
+
+define i32 @main(i32 %argc) nounwind {
+  %1 = load i32* @sum, align 4
+  %2 = getelementptr  [20 x i32]* @array00, i32 0, i32 %argc
+  %3 = load i32* %2, align 4
+  %4 = add i32 %1, %3
+  ret i32 %4;
+}