Index: llvm/trunk/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp =================================================================== --- llvm/trunk/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp +++ llvm/trunk/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp @@ -865,10 +865,9 @@ llvm_unreachable("DbgEntity must be DbgVariable or DbgLabel."); } - if (Label) { - const MCSymbol *Sym = Label->getSymbol(); - addLabelAddress(*Die, dwarf::DW_AT_low_pc, Sym); - } + if (Label) + if (const auto *Sym = Label->getSymbol()) + addLabelAddress(*Die, dwarf::DW_AT_low_pc, Sym); } DbgEntity *DwarfCompileUnit::getExistingAbstractEntity(const DINode *Node) { Index: llvm/trunk/test/DebugInfo/Generic/debug-label-unreached.ll =================================================================== --- llvm/trunk/test/DebugInfo/Generic/debug-label-unreached.ll +++ llvm/trunk/test/DebugInfo/Generic/debug-label-unreached.ll @@ -0,0 +1,39 @@ +; Test unreachable llvm.dbg.label +; +; RUN: llc -filetype=obj -split-dwarf-file debug.dwo -o - %s | llvm-dwarfdump -v - | FileCheck %s +; +; CHECK: .debug_info.dwo contents: +; CHECK: DW_TAG_label +; CHECK-NEXT: DW_AT_name {{.*}}"done" +; CHECK-NOT: {{DW_TAG|NULL}} +; CHECK: DW_AT_low_pc +; CHECK: DW_TAG_label +; CHECK-NEXT: DW_AT_name {{.*}}"removed" +; CHECK-NOT: DW_AT_low_pc +source_filename = "debug-label-unreached.c" + +define dso_local i32 @foo(i32 %a, i32 %b) !dbg !8 { +entry: + %sum = add nsw i32 %a, %b, !dbg !12 + call void @llvm.dbg.label(metadata !11), !dbg !12 + ret i32 %sum, !dbg !13 +} + +declare void @llvm.dbg.label(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-label-unreached.c", directory: "./") +!2 = !{} +!4 = !{i32 2, !"Debug Info Version", i32 3} +!5 = !DISubroutineType(types: !6) +!6 = !{!7} +!7 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) +!8 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 8, type: !5, isLocal: false, isDefinition: true, scopeLine: 9, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !9) +!9 = !{!10, !11} +!10 = !DILabel(scope: !8, name: "removed", file: !1, line: 11) +!11 = !DILabel(scope: !8, name: "done", file: !1, line: 13) +!12 = !DILocation(line: 13, column: 1, scope: !8) +!13 = !DILocation(line: 14, column: 5, scope: !8)