If a scope has only one instruction then first instruction is also the last instruction.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92736 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 19 insertions, 1 deletions

diff --git a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
index 61536d5..134a497 100644
--- a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
@@ -218,7 +218,7 @@ public:
     
     // Use the end of last child scope as end of this scope.
     SmallVector<DbgScope *, 4> &Scopes = getScopes();
-    const MachineInstr *LastInsn = NULL;
+    const MachineInstr *LastInsn = getFirstInsn();
     unsigned LIndex = 0;
     if (Scopes.empty()) {
       assert (getLastInsn() && "Inner most scope does not have last insn!");
diff --git a/test/DebugInfo/2010-01-05-DbgScope.ll b/test/DebugInfo/2010-01-05-DbgScope.ll
new file mode 100644
index 0000000..8cf20e3
--- /dev/null
+++ b/test/DebugInfo/2010-01-05-DbgScope.ll
@@ -0,0 +1,18 @@
+; RUN: llc < %s -o /dev/null
+; PR 5942
+define i8* @foo() nounwind {
+entry:
+  %0 = load i32* undef, align 4, !dbg !0          ; <i32> [#uses=1]
+  %1 = inttoptr i32 %0 to i8*, !dbg !0            ; <i8*> [#uses=1]
+  ret i8* %1, !dbg !10
+
+}
+
+!0 = metadata !{i32 571, i32 3, metadata !1, null}
+!1 = metadata !{i32 458763, metadata !2}; [DW_TAG_lexical_block ]
+!2 = metadata !{i32 458798, i32 0, metadata !3, metadata !"foo", metadata !"foo", metadata !"foo", metadata !3, i32 561, metadata !4, i1 false, i1 true}; [DW_TAG_subprogram ]
+!3 = metadata !{i32 458769, i32 0, i32 12, metadata !"hashtab.c", metadata !"/usr/src/gnu/usr.bin/cc/cc_tools/../../../../contrib/gcclibs/libiberty", metadata !"clang 1.1", i1 true, i1 false, metadata !"", i32 0}; [DW_TAG_compile_unit ]
+!4 = metadata !{i32 458773, metadata !3, metadata !"", null, i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !5, i32 0}; [DW_TAG_subroutine_type ]
+!5 = metadata !{metadata !6}
+!6 = metadata !{i32 458788, metadata !3, metadata !"char", metadata !3, i32 0, i64 8, i64 8, i64 0, i32 0, i32 6} ; [ DW_TAG_base_type ]
+!10 = metadata !{i32 588, i32 1, metadata !2, null}