;; At the moment we emit an undef as soon as we encounter "dangling" variadic | |
;; dbg_value nodes. This does not reduce correctness but does reduce coverage. | |
;; We should make variadic dbg_values work in the same way as their | |
;; non-variadic counterparts here. | |
;; FIXME: When dangling nodes for a variadic dbg_value are found, we should be | |
;; able to recover the value in some cases. | |
; RUN: llc %s -start-after=codegenprepare -stop-before=finalize-isel -o - -experimental-debug-variable-locations=false | FileCheck %s | |
;; Check that dangling debug info in the SelectionDAG build phase is handled | |
;; in the same way for variadic dbg_value ndoes as non-variadics. | |
;; Generated from the following source with -g -O2. Second dbg.value modified | |
;; to be variadic by hand: | |
;; void a(char*); | |
;; void b() { | |
;; char *c = "abc"; | |
;; char *d = "abc"; | |
;; a("abc"); | |
;; } | |
; CHECK: ![[C:[0-9]+]] = !DILocalVariable(name: "c", | |
; CHECK: ![[D:[0-9]+]] = !DILocalVariable(name: "d", | |
; CHECK-DAG: DBG_VALUE %[[VREG:[0-9]]], $noreg, ![[C]], !DIExpression(), debug-location | |
; CHECK-DAG: DBG_VALUE_LIST ![[D]], !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_stack_value), $noreg, debug-location | |
target triple = "x86_64-unknown-linux-gnu" | |
@.str = private unnamed_addr constant [4 x i8] c"abc\00", align 1 | |
define dso_local void @b() local_unnamed_addr !dbg !7 { | |
entry: | |
call void @llvm.dbg.value(metadata ptr @.str, metadata !11, metadata !DIExpression()), !dbg !15 | |
call void @llvm.dbg.value(metadata !DIArgList(ptr @.str), metadata !14, metadata !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_stack_value)), !dbg !15 | |
tail call void @a(ptr @.str) #3, !dbg !16 | |
ret void, !dbg !17 | |
} | |
declare !dbg !18 dso_local void @a(ptr) local_unnamed_addr | |
declare void @llvm.dbg.value(metadata, metadata, metadata) | |
!llvm.dbg.cu = !{!0} | |
!llvm.module.flags = !{!3, !4, !5} | |
!llvm.ident = !{!6} | |
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 11.0.0)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: false, nameTableKind: None) | |
!1 = !DIFile(filename: "test.c", directory: "/") | |
!2 = !{} | |
!3 = !{i32 7, !"Dwarf Version", i32 4} | |
!4 = !{i32 2, !"Debug Info Version", i32 3} | |
!5 = !{i32 1, !"wchar_size", i32 4} | |
!6 = !{!"clang version 11.0.0"} | |
!7 = distinct !DISubprogram(name: "b", scope: !1, file: !1, line: 2, type: !8, scopeLine: 2, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !10) | |
!8 = !DISubroutineType(types: !9) | |
!9 = !{null} | |
!10 = !{!11, !14} | |
!11 = !DILocalVariable(name: "c", scope: !7, file: !1, line: 3, type: !12) | |
!12 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !13, size: 64) | |
!13 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char) | |
!14 = !DILocalVariable(name: "d", scope: !7, file: !1, line: 4, type: !12) | |
!15 = !DILocation(line: 0, scope: !7) | |
!16 = !DILocation(line: 5, column: 3, scope: !7) | |
!17 = !DILocation(line: 6, column: 1, scope: !7) | |
!18 = !DISubprogram(name: "a", scope: !1, file: !1, line: 1, type: !19, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized, retainedNodes: !2) | |
!19 = !DISubroutineType(types: !20) | |
!20 = !{null, !12} |