llvm/test/DebugInfo/X86/location-range.mir

# RUN: llc -start-after=livedebugvalues --filetype=obj %s -o - \
# RUN:     | llvm-dwarfdump -v --name local* --regex - | FileCheck %s
#
# Generated with opt -sroa, llc -stop-after=livedebugvalues, with some metadata
# removed by hand:
# long a, b, c;
# long funone() {
#   unsigned localone;
#   if (c)
#     return b;
#   // Location should start here.
#   localone = 0;
#   return a;
# }
#
# short funtwo() {
#   union {
#     char b[2];
#     short c;
#   } localtwo;
#   {
#     // Location should start here.
#     memcpy(localtwo.b, 0, 2);
#   }
#   return localtwo.c;
# }
#
# Check that the local variables each have a location range which reflects the
# fact that they're both unavailable at the start of the functions.
#
# CHECK:        DW_TAG_variable [
# CHECK-NEXT:     DW_AT_location [DW_FORM_sec_offset]
# CHECK-NEXT:         [0x{{[0-9a-z]+}}, 0x{{[0-9a-z]+}})
# CHECK-NEXT:     DW_AT_name {{.*}} = "localone"
#
# CHECK:        DW_TAG_variable [
# CHECK-NEXT:     DW_AT_location [DW_FORM_sec_offset]
# CHECK-NEXT:         [0x{{[0-9a-z]+}}, 0x{{[0-9a-z]+}})
# CHECK-NEXT:     DW_AT_name {{.*}} = "localtwo"

--- |
  target triple = "x86_64-unknown-linux-gnu"

  @c = dso_local global i64 0, align 8, !dbg !0
  @b = dso_local global i64 0, align 8, !dbg !9
  @a = dso_local global i64 0, align 8, !dbg !6

  define dso_local i64 @funone() !dbg !15 {
  entry:
    %0 = load i64, i64* @c, align 8, !dbg !21
    %tobool = icmp ne i64 %0, 0, !dbg !21
    br i1 %tobool, label %if.then, label %if.end, !dbg !27

  if.then:                                          ; preds = %entry
    %1 = load i64, i64* @b, align 8, !dbg !21
    br label %cleanup, !dbg !21

  if.end:                                           ; preds = %entry
    call void @llvm.dbg.value(metadata i32 0, metadata !19, metadata !DIExpression()), !dbg !27
    %2 = load i64, i64* @a, align 8, !dbg !27
    br label %cleanup, !dbg !27

  cleanup:                                          ; preds = %if.end, %if.then
    %retval.0 = phi i64 [ %1, %if.then ], [ %2, %if.end ], !dbg !27
    ret i64 %retval.0, !dbg !27
  }

  define dso_local signext i16 @funtwo() !dbg !34 {
  entry:
    %localtwo.sroa.0.0.copyload = load i16, i16* null, align 1, !dbg !48
    call void @llvm.dbg.value(metadata i16 %localtwo.sroa.0.0.copyload, metadata !39, metadata !DIExpression()), !dbg !51
    ret i16 %localtwo.sroa.0.0.copyload, !dbg !51
  }

  declare void @llvm.memcpy.p0i8.p0i8.i64(i8* noalias nocapture writeonly, i8* noalias nocapture readonly, i64, i1 immarg)
  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: "c", scope: !2, file: !3, line: 2, type: !8, 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, globals: !5, splitDebugInlining: false, nameTableKind: None)
  !3 = !DIFile(filename: "test.c", directory: "/")
  !4 = !{}
  !5 = !{!6, !9, !0}
  !6 = !DIGlobalVariableExpression(var: !7, expr: !DIExpression())
  !7 = distinct !DIGlobalVariable(name: "a", scope: !2, file: !3, line: 2, type: !8, isLocal: false, isDefinition: true)
  !8 = !DIBasicType(name: "long int", size: 64, encoding: DW_ATE_signed)
  !9 = !DIGlobalVariableExpression(var: !10, expr: !DIExpression())
  !10 = distinct !DIGlobalVariable(name: "b", scope: !2, file: !3, line: 2, type: !8, isLocal: false, isDefinition: true)
  !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: "funone", scope: !3, file: !3, line: 3, type: !16, scopeLine: 3, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !18)
  !16 = !DISubroutineType(types: !17)
  !17 = !{!8}
  !18 = !{!19}
  !19 = !DILocalVariable(name: "localone", scope: !15, file: !3, line: 4, type: !20)
  !20 = !DIBasicType(name: "unsigned int", size: 32, encoding: DW_ATE_unsigned)
  !21 = !DILocation(line: 5, column: 7, scope: !22)
  !22 = distinct !DILexicalBlock(scope: !15, file: !3, line: 5, column: 7)
  !27 = !DILocation(line: 5, column: 7, scope: !15)
  !34 = distinct !DISubprogram(name: "funtwo", scope: !3, file: !3, line: 13, type: !35, scopeLine: 13, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !38)
  !35 = !DISubroutineType(types: !36)
  !36 = !{!37}
  !37 = !DIBasicType(name: "short", size: 16, encoding: DW_ATE_signed)
  !38 = !{!39}
  !39 = !DILocalVariable(name: "localtwo", scope: !34, file: !3, line: 17, type: !40)
  !40 = distinct !DICompositeType(tag: DW_TAG_union_type, scope: !34, file: !3, line: 14, size: 16, elements: !41)
  !41 = !{!42, !47}
  !42 = !DIDerivedType(tag: DW_TAG_member, name: "b", scope: !40, file: !3, line: 15, baseType: !43, size: 16)
  !43 = !DICompositeType(tag: DW_TAG_array_type, baseType: !44, size: 16, elements: !45)
  !44 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char)
  !45 = !{!46}
  !46 = !DISubrange(count: 2)
  !47 = !DIDerivedType(tag: DW_TAG_member, name: "c", scope: !40, file: !3, line: 16, baseType: !37, size: 16)
  !48 = !DILocation(line: 20, column: 5, scope: !49)
  !49 = distinct !DILexicalBlock(scope: !34, file: !3, line: 18, column: 3)
  !51 = !DILocation(line: 22, column: 3, scope: !34)

...
---
name:            funone
body:             |
  bb.0.entry:
    successors: %bb.1(0x50000000), %bb.2(0x30000000)

    CMP64mi8 $rip, 1, $noreg, @c, $noreg, 0, implicit-def $eflags, debug-location !21 :: (dereferenceable load (s64) from @c)
    JCC_1 %bb.2, 4, implicit killed $eflags, debug-location !27

  bb.1.if.then:
    renamable $rax = MOV64rm $rip, 1, $noreg, @b, $noreg, debug-location !21 :: (dereferenceable load (s64) from @b)
    RET64 $rax, debug-location !27

  bb.2.if.end:
    DBG_VALUE 0, $noreg, !19, !DIExpression(), debug-location !27
    renamable $rax = MOV64rm $rip, 1, $noreg, @a, $noreg, debug-location !27 :: (dereferenceable load (s64) from @a)
    RET64 $rax, debug-location !27

...
---
name:            funtwo
body:             |
  bb.0.entry:
    $eax = MOVZX32rm16 $noreg, 1, $noreg, 0, $noreg, debug-location !48 :: (load (s16) from `i16* null`, align 1)
    DBG_VALUE $ax, $noreg, !39, !DIExpression(), debug-location !51
    RET64 $ax, debug-location !51

...