single-location.mir
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# RUN: llc -start-after=livedebugvalues --filetype=obj %s -o - \
# RUN: | llvm-dwarfdump -v - | FileCheck %s
#
# Generated at -O2, stopped after livedebugvalues, with some metadata removed
# by hand:
# int global;
# void ext();
# void fun(int p) {
# {
# int local = p;
# global = local;
# }
# ext();
# }
#
# The variable 'local' is available for the entirety of its enclosing scope so
# we expect to see a single location entry.
#
# Except for 'local', all DILocalVariable metadata has been removed.
#
# CHECK: DW_TAG_lexical_block [
# CHECK: DW_TAG_variable
# CHECK-NEXT: DW_AT_location [DW_FORM_exprloc] (DW_OP_reg5 RDI)
# CHECK-NEXT: DW_AT_name {{.*}} = "local"
--- |
target triple = "x86_64-unknown-linux-gnu"
@global = dso_local local_unnamed_addr global i32 0, align 4, !dbg !0
define dso_local void @fun(i32 %p) local_unnamed_addr !dbg !15 {
entry:
call void @llvm.dbg.value(metadata i32 %p, metadata !20, metadata !DIExpression()), !dbg !23
store i32 %p, i32* @global, align 4, !dbg !24
tail call void (...) @ext(), !dbg !29
ret void, !dbg !30
}
declare !dbg !6 dso_local void @ext(...) local_unnamed_addr
declare void @llvm.dbg.value(metadata, metadata, metadata)
!llvm.dbg.cu = !{!2}
!llvm.module.flags = !{!11, !12, !13}
!llvm.ident = !{!14}
!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
!1 = distinct !DIGlobalVariable(name: "global", scope: !2, file: !3, line: 1, type: !10, isLocal: false, isDefinition: true)
!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 11.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, retainedTypes: !5, globals: !9, splitDebugInlining: false, nameTableKind: None)
!3 = !DIFile(filename: "test.c", directory: "/")
!4 = !{}
!5 = !{!6}
!6 = !DISubprogram(name: "ext", scope: !3, file: !3, line: 2, type: !7, spFlags: DISPFlagOptimized, retainedNodes: !4)
!7 = !DISubroutineType(types: !8)
!8 = !{null, null}
!9 = !{!0}
!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!11 = !{i32 7, !"Dwarf Version", i32 4}
!12 = !{i32 2, !"Debug Info Version", i32 3}
!13 = !{i32 1, !"wchar_size", i32 4}
!14 = !{!"clang version 11.0.0"}
!15 = distinct !DISubprogram(name: "fun", scope: !3, file: !3, line: 3, type: !16, scopeLine: 3, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !18)
!16 = !DISubroutineType(types: !17)
!17 = !{null, !10}
!18 = !{!20}
!20 = !DILocalVariable(name: "local", scope: !21, file: !3, line: 5, type: !10)
!21 = distinct !DILexicalBlock(scope: !15, file: !3, line: 4, column: 3)
!22 = !DILocation(line: 0, scope: !15)
!23 = !DILocation(line: 0, scope: !21)
!24 = !DILocation(line: 6, column: 12, scope: !21)
!29 = !DILocation(line: 8, column: 3, scope: !15)
!30 = !DILocation(line: 9, column: 1, scope: !15)
...
---
name: fun
body: |
bb.0.entry:
liveins: $edi
DBG_VALUE $edi, $noreg, !20, !DIExpression(), debug-location !23
MOV32mr $rip, 1, $noreg, @global, $noreg, killed renamable $edi, debug-location !24 :: (store 4 into @global)
dead $eax = XOR32rr undef $eax, undef $eax, implicit-def dead $eflags, implicit-def $al, debug-location !29
TAILJMPd64 @ext, csr_64, implicit $rsp, implicit $ssp, implicit $rsp, implicit $ssp, implicit killed $al, debug-location !29
...