llvm/test/DebugInfo/X86/single-location-2.mir

# RUN: llc %s --start-after=livedebugvalues -filetype=obj -o - \
# RUN:     | llvm-dwarfdump - -name local* -regex \
# RUN:     | FileCheck %s
#
## This tests certain single location detection functionality. The Test MIR
## is hand written. 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, splitDebugInlining: false, nameTableKind: None)
  !1 = !DIFile(filename: "example.c", directory: "/")
  !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)
  !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)
  !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)
  !27 = !DILocalVariable(name: "tmp",    scope: !14, file: !1, line: 2, 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 tmp;    } // scope fun:block !14, var localb !27, debug-location !18
    ;;   { int localc; } // scope fun:block !24, var localc !25, debug-location !26
    ;; }
    ;;
    ;; (1) Check that frame-setup instructions are not counted against
    ;;     locations being valid throughout the function call.
    ;
    ; CHECK:      DW_TAG_variable
    ; CHECK-NEXT:   DW_AT_location (DW_OP_reg5 RDI)
    ; CHECK-NEXT:   DW_AT_name ("locala")
    $rbp = frame-setup MOV64rr $rsp
    DBG_VALUE $edi, $noreg, !12, !DIExpression(), debug-location !15
    $eax = MOV32ri 0, debug-location !15

    ;; (2) The scope block ends with a meta instruction. A location range ends
    ;;     with the final non-meta instruction in the scope. Check that
    ;;     location is considered valid throughout.
    ;
    ; CHECK:      DW_TAG_variable
    ; CHECK-NEXT:   DW_AT_location (DW_OP_reg2 RCX)
    ; CHECK-NEXT:   DW_AT_name ("localb")
    ;
    ;; start scope, start location range
    DBG_VALUE $ecx, $noreg, !13, !DIExpression(), debug-location !18
    ;; end location range
    $ecx = MOV32ri 1, debug-location !18
    ;; end scope
    DBG_VALUE $noreg, $noreg, !27, !DIExpression(), debug-location !18

    ;; (3) The final instruction in the scope closes a location range. Check
    ;;     that location is considered valid throughout.
    ;
    ; CHECK:      DW_TAG_variable
    ; CHECK-NEXT:   DW_AT_location (DW_OP_reg4 RSI)
    ; CHECK-NEXT:   DW_AT_name ("localc")
    ;
    ;; start scope, start location range
    DBG_VALUE $esi, $noreg, !25, !DIExpression(), debug-location !26
    ;; end scope, end location range
    $esi = MOV32ri 2, debug-location !26

    RET64 debug-location !15
...