trim-var-locs.mir
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# RUN: llc %s --start-after=livedebugvalues -filetype=obj -o - \
# RUN: | llvm-dwarfdump - -name local* -regex \
# RUN: | FileCheck %s
#
# Test that the -trim-var-locs option (enabled by default) works correctly.
# Test directives and comments inline.
--- |
target triple = "x86_64-unknown-linux-gnu"
define dso_local i32 @fun() local_unnamed_addr !dbg !7 {
entry:
ret i32 0
}
!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: "example.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"}
!8 = !DISubroutineType(types: !9)
!9 = !{!10}
!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!11 = !{!12, !13, !25}
!22 = !DISubroutineType(types: !23)
!23 = !{!10, !10}
; --- Important metadata ---
!7 = distinct !DISubprogram(name: "fun", scope: !1, file: !1, line: 2, type: !8, scopeLine: 2, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !11)
!24 = distinct !DILexicalBlock(scope: !7, file: !1, line: 9, column: 3)
!14 = distinct !DILexicalBlock(scope: !7, file: !1, line: 4, column: 3)
!12 = !DILocalVariable(name: "locala", scope: !7, file: !1, line: 1, type: !10)
!13 = !DILocalVariable(name: "localb", scope: !14, file: !1, line: 2, type: !10)
!25 = !DILocalVariable(name: "localc", scope: !24, file: !1, line: 3, type: !10)
!15 = !DILocation(line: 1, column: 0, scope: !7)
!18 = !DILocation(line: 2, column: 1, scope: !14)
!26 = !DILocation(line: 3, column: 1, scope: !24)
...
---
name: fun
body: |
bb.0.entry:
; This is the scope and variable structure:
; int fun() { // scope fun !7
; int locala; // scope fun !7, var locala !12, debug-location !15
; { int localb; } // scope fun:block !14, var localb !13, debug-location !18
; { int localc; } // scope fun:block !24, var localc !25, debug-location !26
; }
;
; (1) Check that a variable location range found in implied scope fun !7 is
; not trimmed.
;
; CHECK: DW_TAG_variable
; CHECK-NEXT: DW_AT_location
; CHECK-NEXT: DW_OP_reg0 RAX
; CHECK-NEXT: DW_AT_name ("locala")
;
; scope fun !7 is implied as we're in function fun and haven't seen a debug-location
$eax = MOV32ri 0
; locala range 1 start in implicit scope fun !7
DBG_VALUE $eax, $noreg, !12, !DIExpression(), debug-location !15
$edi = MOV32ri 1
; locala range 1 clobber in implicit scope fun !7
$eax = MOV32ri 2
; scope fun !7 explicit start
$edi = MOV32ri 3, debug-location !15
; (2) Check that a variable location range found outside lexical block is
; trimmed. See check directives for (3).
;
; localb range 1 start in scope fun !7 (outside block !14).
DBG_VALUE $eax, $noreg, !13, !DIExpression(), debug-location !18
; localb range 1 clobber in scope fun !7
$edi = MOV32ri 4, debug-location !15
; (3) Check that a variable location range which overlaps the entire lexical
; block is not trimmed.
;
; CHECK: DW_TAG_variable
; CHECK-NEXT: DW_AT_location (DW_OP_reg5 RDI)
; CHECK-NEXT: DW_AT_name ("localb")
;
; localb range 2 clobber in scope fun !7 (outside block !14)
DBG_VALUE $edi, $noreg, !13, !DIExpression(), debug-location !18
; scope block !14 start (and only instruction)
$edi = MOV32ri 5, debug-location !18
; (4) Check that a variable location range in scope fun !7 (outside block
; !14) is trimmed. See check directives for (3).
;
; localb range 3 starts after scope !14 (prev instr is last in scope)
DBG_VALUE $rax, $noreg, !13, !DIExpression(), debug-location !18
; scope block !14 end
$edi = MOV32ri 6, debug-location !15
; (5) Check that a variable location range found between disjoint scope
; ranges is trimmed.
;
; CHECK: DW_TAG_variable
; CHECK-NOT: DW_AT_location
; CHECK-NEXT: DW_AT_name ("localc")
;
; scope fun !7
$edi = MOV32ri 6, debug-location !15
; scope block !24 start and end range 1
$edi = MOV32ri 7, debug-location !26
; localc range 1 start in scope !7
DBG_VALUE $edi, $noreg, !25, !DIExpression(), debug-location !18
; localc range 1 clobber in scope !7
$edi = MOV32ri 8, debug-location !15
; scope block !24 start and end range 2
$edi = MOV32ri 9, debug-location !26
; scope fun !7
RETQ debug-location !15
...