Looks like OS X assemblers (including MC) don't like

foo:
bar = foo
.quad bar

Avoid producing it. Fixes PR9951.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131687 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/MC/MCStreamer.cpp b/lib/MC/MCStreamer.cpp
index 8aaad5ee0d15a366a45c872659aa71d7d0e59a85..4e4cb8c4ce4db788765f6a6f188d34c7076204a1 100644 (file)
--- a/lib/MC/MCStreamer.cpp
+++ b/lib/MC/MCStreamer.cpp
@@ -43,7 +43,8 @@ const MCExpr *MCStreamer::BuildSymbolDiff(MCContext &Context,
 }
 
 const MCExpr *MCStreamer::ForceExpAbs(const MCExpr* Expr) {
-  if (Context.getAsmInfo().hasAggressiveSymbolFolding())
+  if (Context.getAsmInfo().hasAggressiveSymbolFolding() ||
+      isa<MCSymbolRefExpr>(Expr))
     return Expr;
 
   MCSymbol *ABS = Context.CreateTempSymbol();

diff --git a/test/DebugInfo/pr9951.ll b/test/DebugInfo/pr9951.ll
new file mode 100644 (file)
index 0000000..7716cd7
--- /dev/null
+++ b/test/DebugInfo/pr9951.ll
@@ -0,0 +1,23 @@
+; RUN: llc -mtriple x86_64-apple-darwin10.0.0 -disable-cfi %s -o - | FileCheck %s
+
+define i32 @f() nounwind {
+entry:
+  ret i32 42
+}
+
+!llvm.dbg.sp = !{!0}
+
+!0 = metadata !{i32 589870, i32 0, metadata !1, metadata !"f", metadata !"f", metadata !"", metadata !1, i32 1, metadata !3, i1 false, i1 true, i32 0, i32 0, i32 0, i32 256, i1 false, i32 ()* @f, null, null} ; [ DW_TAG_subprogram ]
+!1 = metadata !{i32 589865, metadata !"/home/espindola/llvm/test.c", metadata !"/home/espindola/llvm/build-rust2", metadata !2} ; [ DW_TAG_file_type ]
+!2 = metadata !{i32 589841, i32 0, i32 12, metadata !"/home/espindola/llvm/test.c", metadata !"/home/espindola/llvm/build-rust2", metadata !"clang version 3.0 ()", i1 true, i1 false, metadata !"", i32 0} ; [ DW_TAG_compile_unit ]
+!3 = metadata !{i32 589845, metadata !1, metadata !"", metadata !1, i32 0, i64 0, i64 0, i32 0, i32 0, i32 0, metadata !4, i32 0, i32 0} ; [ DW_TAG_subroutine_type ]
+!4 = metadata !{metadata !5}
+!5 = metadata !{i32 589860, metadata !2, metadata !"int", null, i32 0, i64 32, i64 32, i64 0, i32 0, i32 5} ; [ DW_TAG_base_type ]
+
+
+; CHECK:      _f:                                     ## @f
+; CHECK-NEXT: Ltmp0:
+
+; CHECK:      Ltmp9 = (Ltmp3-Ltmp2)-0
+; CHECK-NEXT:  .long   Ltmp9
+; CHECK-NEXT:  .quad   Ltmp0