Fix emission of debug data for global variables. getContext() on DIGlobalVariables is not valid any more.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@140539 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 60 insertions, 2 deletions

diff --git a/include/llvm/Analysis/DebugInfo.h b/include/llvm/Analysis/DebugInfo.h
index b0cf17a..1022302 100644
--- a/include/llvm/Analysis/DebugInfo.h
+++ b/include/llvm/Analysis/DebugInfo.h
@@ -579,6 +579,17 @@ namespace llvm {
       DIFile F = getFieldAs<DIFile>(6); 
       return F.getCompileUnit();
     }
+    StringRef getFilename() const {
+      if (getVersion() <= llvm::LLVMDebugVersion10)
+        return getContext().getFilename();
+      return getFieldAs<DIFile>(6).getFilename();
+    } 
+    StringRef getDirectory() const {
+      if (getVersion() <= llvm::LLVMDebugVersion10)
+        return getContext().getDirectory();
+      return getFieldAs<DIFile>(6).getDirectory();
+
+    } 
 
     unsigned getLineNumber() const      { return getUnsignedField(7); }
     DIType getType() const              { return getFieldAs<DIType>(8); }
diff --git a/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp b/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
index 1e1ddca..7f294d3 100644
--- a/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
@@ -135,8 +135,8 @@ void CompileUnit::addSourceLine(DIE *Die, DIGlobalVariable G) {
   unsigned Line = G.getLineNumber();
   if (Line == 0)
     return;
-  unsigned FileID = DD->GetOrCreateSourceID(G.getContext().getFilename(),
-                                            G.getContext().getDirectory());
+  unsigned FileID = DD->GetOrCreateSourceID(G.getFilename(),
+                                            G.getDirectory());
   assert(FileID && "Invalid file id");
   addUInt(Die, dwarf::DW_AT_decl_file, 0, FileID);
   addUInt(Die, dwarf::DW_AT_decl_line, 0, Line);
diff --git a/test/DebugInfo/2011-09-26-GlobalVarContext.ll b/test/DebugInfo/2011-09-26-GlobalVarContext.ll
new file mode 100644
index 0000000..09c074d
--- /dev/null
+++ b/test/DebugInfo/2011-09-26-GlobalVarContext.ll
@@ -0,0 +1,47 @@
+; RUN: llc -asm-verbose %s -o - | FileCheck %s
+
+; ModuleID = 'test.c'
+
+@GLOBAL = common global i32 0, align 4
+
+define i32 @f() nounwind {
+  %LOCAL = alloca i32, align 4
+  call void @llvm.dbg.declare(metadata !{i32* %LOCAL}, metadata !15), !dbg !17
+  %1 = load i32* @GLOBAL, align 4, !dbg !18
+  store i32 %1, i32* %LOCAL, align 4, !dbg !18
+  %2 = load i32* @GLOBAL, align 4, !dbg !19
+  ret i32 %2, !dbg !19
+}
+
+declare void @llvm.dbg.declare(metadata, metadata) nounwind readnone
+
+!llvm.dbg.cu = !{!0}
+
+!0 = metadata !{i32 720913, i32 0, i32 12, metadata !"test.c", metadata !"/work/llvm/vanilla/test/DebugInfo", metadata !"clang version 3.0 (trunk)", i1 true, i1 false, metadata !"", i32 0, metadata !1, metadata !1, metadata !3, metadata !12} ; [ DW_TAG_compile_unit ]
+!1 = metadata !{metadata !2}
+!2 = metadata !{i32 0}
+!3 = metadata !{metadata !4}
+!4 = metadata !{metadata !5}
+!5 = metadata !{i32 720942, i32 0, metadata !6, metadata !"f", metadata !"f", metadata !"", metadata !6, i32 3, metadata !7, i1 false, i1 true, i32 0, i32 0, i32 0, i32 0, i1 false, i32 ()* @f, null, null, metadata !10} ; [ DW_TAG_subprogram ]
+!6 = metadata !{i32 720937, metadata !"test.c", metadata !"/work/llvm/vanilla/test/DebugInfo", null} ; [ DW_TAG_file_type ]
+!7 = metadata !{i32 720917, i32 0, metadata !"", i32 0, i32 0, i64 0, i64 0, i32 0, i32 0, i32 0, metadata !8, i32 0, i32 0} ; [ DW_TAG_subroutine_type ]
+!8 = metadata !{metadata !9}
+!9 = metadata !{i32 720932, null, metadata !"int", null, i32 0, i64 32, i64 32, i64 0, i32 0, i32 5} ; [ DW_TAG_base_type ]
+!10 = metadata !{metadata !11}
+!11 = metadata !{i32 720932}                      ; [ DW_TAG_base_type ]
+!12 = metadata !{metadata !13}
+!13 = metadata !{metadata !14}
+!14 = metadata !{i32 720948, i32 0, null, metadata !"GLOBAL", metadata !"GLOBAL", metadata !"", metadata !6, i32 1, metadata !9, i32 0, i32 1, i32* @GLOBAL} ; [ DW_TAG_variable ]
+!15 = metadata !{i32 721152, metadata !16, metadata !"LOCAL", metadata !6, i32 4, metadata !9, i32 0, i32 0} ; [ DW_TAG_auto_variable ]
+!16 = metadata !{i32 720907, metadata !5, i32 3, i32 9, metadata !6, i32 0} ; [ DW_TAG_lexical_block ]
+!17 = metadata !{i32 4, i32 9, metadata !16, null}
+!18 = metadata !{i32 4, i32 23, metadata !16, null}
+!19 = metadata !{i32 5, i32 5, metadata !16, null}
+
+; CHECK: .ascii	 "GLOBAL"               # DW_AT_name
+; CHECK: .byte	1                       # DW_AT_decl_file
+; CHECK: .byte	1                       # DW_AT_decl_line
+
+; CHECK: .ascii	 "LOCAL"                # DW_AT_name
+; CHECK: .byte	1                       # DW_AT_decl_file
+; CHECK: .byte	4                       # DW_AT_decl_line