1 files changed, 59 insertions, 0 deletions
diff --git a/llvm/test/DebugInfo/Generic/debug-var-slot.ll b/llvm/test/DebugInfo/Generic/debug-var-slot.ll
new file mode 100644
index 00000000000..bed1d90f6e5
--- /dev/null
+++ b/llvm/test/DebugInfo/Generic/debug-var-slot.ll
@@ -0,0 +1,59 @@
+; After adding new debug instruction for labels, it is possible to have
+; debug instructions before DBG_VALUE. When querying DBG_VALUE's slot
+; index using previous instruction and the previous instruction is debug
+; instruction, it will trigger an assertion as using debug instruction
+; to get slot index. This test is to emulate the case when DBG_VALUE's
+; previous instruction is DBG_LABEL in LiveDebugVariables pass.
+;
+; RUN: llc < %s -stop-after=livedebugvars -debug 2>&1 | FileCheck %s
+;
+; CHECK: COMPUTING LIVE DEBUG VARIABLES: foo
+; CHECK: DEBUG VARIABLES
+; CHECK-NEXT: "local_var,7"
+
+source_filename = "debug-var-slot.c"
+
+define dso_local i32 @foo(i32 %a, i32 %b) !dbg !6 {
+entry:
+  %a.addr = alloca i32, align 4
+  %b.addr = alloca i32, align 4
+  %sum = alloca i32, align 4
+  store i32 %a, i32* %a.addr, align 4
+  store i32 %b, i32* %b.addr, align 4
+  br label %top
+
+top:
+  call void @llvm.dbg.label(metadata !10), !dbg !13
+  call void @llvm.dbg.value(metadata i32 %0, metadata !12, metadata !DIExpression()), !dbg !14
+  %0 = load i32, i32* %a.addr, align 4
+  %1 = load i32, i32* %a.addr, align 4
+  %2 = load i32, i32* %b.addr, align 4
+  %add = add nsw i32 %1, %2
+  store i32 %add, i32* %sum, align 4
+  br label %done
+
+done:
+  %3 = load i32, i32* %sum, align 4
+  ret i32 %3, !dbg !15
+}
+
+declare void @llvm.dbg.label(metadata)
+declare void @llvm.dbg.value(metadata, metadata, metadata)
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!4}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, isOptimized: true, emissionKind: FullDebug, enums: !2)
+!1 = !DIFile(filename: "debug-var-slot.c", directory: "./")
+!2 = !{}
+!4 = !{i32 2, !"Debug Info Version", i32 3}
+!6 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 1, type: !7, isLocal: false, isDefinition: true, scopeLine: 2, isOptimized: true, unit: !0, retainedNodes: !2)
+!7 = !DISubroutineType(types: !8)
+!8 = !{!9, !9, !9}
+!9 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+!10 = !DILabel(scope: !6, name: "top", file: !1, line: 4)
+!11 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+!12 = !DILocalVariable(name: "local_var", scope: !6, file: !1, line: 7, type: !11)
+!13 = !DILocation(line: 4, column: 1, scope: !6)
+!14 = !DILocation(line: 7, column: 1, scope: !6)
+!15 = !DILocation(line: 8, column: 3, scope: !6)