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[Clang][DebugInfo] typedef in template class given wrong scope #91451

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OCHyams opened this issue May 8, 2024 · 3 comments
Open

[Clang][DebugInfo] typedef in template class given wrong scope #91451

OCHyams opened this issue May 8, 2024 · 3 comments
Labels
clang:codegen debuginfo

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@OCHyams
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OCHyams commented May 8, 2024

Clang trunk built at d4cf20c (19.0)

Godbolt version of example below https://godbolt.org/z/7esxK8dbY

$ cat test.cpp

struct X {
  typedef int inside;
  inside i;
};

template <typename T = int>
struct Y {
  typedef int outside;
  outside o;
};

X x;
Y<> y;

The DIE for outside is scoped to DW_TAG_compile_unit (0x0000000b) while the DIE for inside is scoped to its enclosing DW_TAG_structure_type (0x00000033). outside should be scoped to the DW_TAG_structure_type DIE for Y<int> (0x00000070).

$ clang -O0 -g test.cpp -o - | llvm-dwarfdump -

0x00000000: Compile Unit: length = 0x00000097, format = DWARF32, version = 0x0004, abbr_offset = 0x0000, addr_size = 0x08 (next unit at 0x0000009b)

0x0000000b: DW_TAG_compile_unit
              DW_AT_producer	("clang version 19.0.0git (https://github.com/llvm/llvm-project.git d4cf20ca37160cb062a9db773d0e6255d6bbc31a)")
              DW_AT_language	(DW_LANG_C_plus_plus_14)
              DW_AT_name	("test.cpp")
              DW_AT_stmt_list	(0x00000000)
              DW_AT_comp_dir	("/")

0x0000001e:   DW_TAG_variable
                DW_AT_name	("x")
                DW_AT_type	(0x00000033 "X")
                DW_AT_external	(true)
                DW_AT_decl_file	("test.cpp")
                DW_AT_decl_line	(12)
                DW_AT_location	(DW_OP_addr 0x0)

0x00000033:   DW_TAG_structure_type
                DW_AT_calling_convention	(DW_CC_pass_by_value)
                DW_AT_name	("X")
                DW_AT_byte_size	(0x04)
                DW_AT_decl_file	("test.cpp")
                DW_AT_decl_line	(1)

0x0000003c:     DW_TAG_member
                  DW_AT_name	("i")
                  DW_AT_type	(0x00000048 "inside")
                  DW_AT_decl_file	("test.cpp")
                  DW_AT_decl_line	(3)
                  DW_AT_data_member_location	(0x00)

0x00000048:     DW_TAG_typedef
                  DW_AT_type	(0x00000054 "int")
                  DW_AT_name	("inside")
                  DW_AT_decl_file	("test.cpp")
                  DW_AT_decl_line	(2)

0x00000053:     NULL

0x00000054:   DW_TAG_base_type
                DW_AT_name	("int")
                DW_AT_encoding	(DW_ATE_signed)
                DW_AT_byte_size	(0x04)

0x0000005b:   DW_TAG_variable
                DW_AT_name	("y")
                DW_AT_type	(0x00000070 "Y<int>")
                DW_AT_external	(true)
                DW_AT_decl_file	("test.cpp")
                DW_AT_decl_line	(13)
                DW_AT_location	(DW_OP_addr 0x0)

0x00000070:   DW_TAG_structure_type
                DW_AT_calling_convention	(DW_CC_pass_by_value)
                DW_AT_name	("Y<int>")
                DW_AT_byte_size	(0x04)
                DW_AT_decl_file	("test.cpp")
                DW_AT_decl_line	(7)

0x00000079:     DW_TAG_template_type_parameter
                  DW_AT_type	(0x00000054 "int")
                  DW_AT_name	("T")
                  DW_AT_default_value	(true)

0x00000082:     DW_TAG_member
                  DW_AT_name	("o")
                  DW_AT_type	(0x0000008f "outside")
                  DW_AT_decl_file	("test.cpp")
                  DW_AT_decl_line	(9)
                  DW_AT_data_member_location	(0x00)

0x0000008e:     NULL

0x0000008f:   DW_TAG_typedef
                DW_AT_type	(0x00000054 "int")
                DW_AT_name	("outside")
                DW_AT_decl_file	("test.cpp")
                DW_AT_decl_line	(8)

0x0000009a:   NULL

Looking at the IR produced by Clang:

$ clang -O0 -g test.cpp -emit-llvm -S -o -

source_filename = "test.cpp"
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

%struct.X = type { i32 }
%struct.Y = type { i32 }

@x = dso_local global %struct.X zeroinitializer, align 4, !dbg !0
@y = dso_local global %struct.Y zeroinitializer, align 4, !dbg !5

!llvm.dbg.cu = !{!2}
!llvm.module.flags = !{!19, !20, !21, !22, !23, !24, !25}
!llvm.ident = !{!26}

!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
!1 = distinct !DIGlobalVariable(name: "x", scope: !2, file: !7, line: 12, type: !15, isLocal: false, isDefinition: true)
!2 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !3, producer: "clang version 19.0.0git (https://github.com/llvm/llvm-project.git d4cf20ca37160cb062a9db773d0e6255d6bbc31a)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, globals: !4, splitDebugInlining: false, nameTableKind: None)
!3 = !DIFile(filename: "test.cpp")
!4 = !{!0, !5}
!5 = !DIGlobalVariableExpression(var: !6, expr: !DIExpression())
!6 = distinct !DIGlobalVariable(name: "y", scope: !2, file: !7, line: 13, type: !8, isLocal: false, isDefinition: true)
!7 = !DIFile(filename: "example.cpp"test.cpp)
!8 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "Y<int>", file: !7, line: 7, size: 32, flags: DIFlagTypePassByValue, elements: !9, templateParams: !13, identifier: "_ZTS1YIiE")
!9 = !{!10}
!10 = !DIDerivedType(tag: DW_TAG_member, name: "o", scope: !8, file: !7, line: 9, baseType: !11, size: 32)
!11 = !DIDerivedType(tag: DW_TAG_typedef, name: "outside", file: !7, line: 8, baseType: !12)
!12 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!13 = !{!14}
!14 = !DITemplateTypeParameter(name: "T", type: !12, defaulted: true)
!15 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "X", file: !7, line: 1, size: 32, flags: DIFlagTypePassByValue, elements: !16, identifier: "_ZTS1X")
!16 = !{!17}
!17 = !DIDerivedType(tag: DW_TAG_member, name: "i", scope: !15, file: !7, line: 3, baseType: !18, size: 32)
!18 = !DIDerivedType(tag: DW_TAG_typedef, name: "inside", scope: !15, file: !7, line: 2, baseType: !12)
!19 = !{i32 7, !"Dwarf Version", i32 4}
!20 = !{i32 2, !"Debug Info Version", i32 3}
!21 = !{i32 1, !"wchar_size", i32 4}
!22 = !{i32 8, !"PIC Level", i32 2}
!23 = !{i32 7, !"PIE Level", i32 2}
!24 = !{i32 7, !"uwtable", i32 2}
!25 = !{i32 7, !"frame-pointer", i32 2}
!26 = !{!"clang version 19.0.0git (https://github.com/llvm/llvm-project.git d4cf20ca37160cb062a9db773d0e6255d6bbc31a)"}

inside has a scope field pointing to X.

!15 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "X", ...)
!18 = !DIDerivedType(tag: DW_TAG_typedef, name: "inside", scope: !15, file: !7, line: 2, baseType: !12)

outside has no scope field.

!11 = !DIDerivedType(tag: DW_TAG_typedef, name: "outside", file: !7, line: 8, baseType: !12)
@github-actions github-actions bot added the clang Clang issues not falling into any other category label May 8, 2024
@OCHyams
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OCHyams commented May 8, 2024

Unknown if it has the same root cause as #44229

@OCHyams OCHyams mentioned this issue May 8, 2024
Merged
@EugeneZelenko EugeneZelenko added clang:codegen debuginfo and removed clang Clang issues not falling into any other category labels May 8, 2024
@llvmbot
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llvmbot commented May 8, 2024

@llvm/issue-subscribers-debuginfo

Author: Orlando Cazalet-Hyams (OCHyams)

Clang trunk built at d4cf20c (19.0)

Godbolt version of example below https://godbolt.org/z/7esxK8dbY

$ cat test.cpp

struct X {
  typedef int inside;
  inside i;
};

template &lt;typename T = int&gt;
struct Y {
  typedef int outside;
  outside o;
};

X x;
Y&lt;&gt; y;

The DIE for outside is scoped to DW_TAG_compile_unit (0x0000000b) while the DIE for inside is scoped to its enclosing DW_TAG_structure_type (0x00000033). outside should be scoped to the DW_TAG_structure_type DIE for Y&lt;int&gt; (0x00000070).

$ clang -O0 -g test.cpp -o - | llvm-dwarfdump -

0x00000000: Compile Unit: length = 0x00000097, format = DWARF32, version = 0x0004, abbr_offset = 0x0000, addr_size = 0x08 (next unit at 0x0000009b)

0x0000000b: DW_TAG_compile_unit
              DW_AT_producer	("clang version 19.0.0git (https://github.com/llvm/llvm-project.git d4cf20ca37160cb062a9db773d0e6255d6bbc31a)")
              DW_AT_language	(DW_LANG_C_plus_plus_14)
              DW_AT_name	("test.cpp")
              DW_AT_stmt_list	(0x00000000)
              DW_AT_comp_dir	("/")

0x0000001e:   DW_TAG_variable
                DW_AT_name	("x")
                DW_AT_type	(0x00000033 "X")
                DW_AT_external	(true)
                DW_AT_decl_file	("test.cpp")
                DW_AT_decl_line	(12)
                DW_AT_location	(DW_OP_addr 0x0)

0x00000033:   DW_TAG_structure_type
                DW_AT_calling_convention	(DW_CC_pass_by_value)
                DW_AT_name	("X")
                DW_AT_byte_size	(0x04)
                DW_AT_decl_file	("test.cpp")
                DW_AT_decl_line	(1)

0x0000003c:     DW_TAG_member
                  DW_AT_name	("i")
                  DW_AT_type	(0x00000048 "inside")
                  DW_AT_decl_file	("test.cpp")
                  DW_AT_decl_line	(3)
                  DW_AT_data_member_location	(0x00)

0x00000048:     DW_TAG_typedef
                  DW_AT_type	(0x00000054 "int")
                  DW_AT_name	("inside")
                  DW_AT_decl_file	("test.cpp")
                  DW_AT_decl_line	(2)

0x00000053:     NULL

0x00000054:   DW_TAG_base_type
                DW_AT_name	("int")
                DW_AT_encoding	(DW_ATE_signed)
                DW_AT_byte_size	(0x04)

0x0000005b:   DW_TAG_variable
                DW_AT_name	("y")
                DW_AT_type	(0x00000070 "Y&lt;int&gt;")
                DW_AT_external	(true)
                DW_AT_decl_file	("test.cpp")
                DW_AT_decl_line	(13)
                DW_AT_location	(DW_OP_addr 0x0)

0x00000070:   DW_TAG_structure_type
                DW_AT_calling_convention	(DW_CC_pass_by_value)
                DW_AT_name	("Y&lt;int&gt;")
                DW_AT_byte_size	(0x04)
                DW_AT_decl_file	("test.cpp")
                DW_AT_decl_line	(7)

0x00000079:     DW_TAG_template_type_parameter
                  DW_AT_type	(0x00000054 "int")
                  DW_AT_name	("T")
                  DW_AT_default_value	(true)

0x00000082:     DW_TAG_member
                  DW_AT_name	("o")
                  DW_AT_type	(0x0000008f "outside")
                  DW_AT_decl_file	("test.cpp")
                  DW_AT_decl_line	(9)
                  DW_AT_data_member_location	(0x00)

0x0000008e:     NULL

0x0000008f:   DW_TAG_typedef
                DW_AT_type	(0x00000054 "int")
                DW_AT_name	("outside")
                DW_AT_decl_file	("test.cpp")
                DW_AT_decl_line	(8)

0x0000009a:   NULL

Looking at the IR produced by Clang:

$ clang -O0 -g test.cpp -emit-llvm -S -o -

source_filename = "test.cpp"
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

%struct.X = type { i32 }
%struct.Y = type { i32 }

@<!-- -->x = dso_local global %struct.X zeroinitializer, align 4, !dbg !0
@<!-- -->y = dso_local global %struct.Y zeroinitializer, align 4, !dbg !5

!llvm.dbg.cu = !{!2}
!llvm.module.flags = !{!19, !20, !21, !22, !23, !24, !25}
!llvm.ident = !{!26}

!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
!1 = distinct !DIGlobalVariable(name: "x", scope: !2, file: !7, line: 12, type: !15, isLocal: false, isDefinition: true)
!2 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !3, producer: "clang version 19.0.0git (https://github.com/llvm/llvm-project.git d4cf20ca37160cb062a9db773d0e6255d6bbc31a)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, globals: !4, splitDebugInlining: false, nameTableKind: None)
!3 = !DIFile(filename: "test.cpp")
!4 = !{!0, !5}
!5 = !DIGlobalVariableExpression(var: !6, expr: !DIExpression())
!6 = distinct !DIGlobalVariable(name: "y", scope: !2, file: !7, line: 13, type: !8, isLocal: false, isDefinition: true)
!7 = !DIFile(filename: "example.cpp"test.cpp)
!8 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "Y&lt;int&gt;", file: !7, line: 7, size: 32, flags: DIFlagTypePassByValue, elements: !9, templateParams: !13, identifier: "_ZTS1YIiE")
!9 = !{!10}
!10 = !DIDerivedType(tag: DW_TAG_member, name: "o", scope: !8, file: !7, line: 9, baseType: !11, size: 32)
!11 = !DIDerivedType(tag: DW_TAG_typedef, name: "outside", file: !7, line: 8, baseType: !12)
!12 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!13 = !{!14}
!14 = !DITemplateTypeParameter(name: "T", type: !12, defaulted: true)
!15 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "X", file: !7, line: 1, size: 32, flags: DIFlagTypePassByValue, elements: !16, identifier: "_ZTS1X")
!16 = !{!17}
!17 = !DIDerivedType(tag: DW_TAG_member, name: "i", scope: !15, file: !7, line: 3, baseType: !18, size: 32)
!18 = !DIDerivedType(tag: DW_TAG_typedef, name: "inside", scope: !15, file: !7, line: 2, baseType: !12)
!19 = !{i32 7, !"Dwarf Version", i32 4}
!20 = !{i32 2, !"Debug Info Version", i32 3}
!21 = !{i32 1, !"wchar_size", i32 4}
!22 = !{i32 8, !"PIC Level", i32 2}
!23 = !{i32 7, !"PIE Level", i32 2}
!24 = !{i32 7, !"uwtable", i32 2}
!25 = !{i32 7, !"frame-pointer", i32 2}
!26 = !{!"clang version 19.0.0git (https://github.com/llvm/llvm-project.git d4cf20ca37160cb062a9db773d0e6255d6bbc31a)"}

inside has a scope field pointing to X.

!15 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "X", ...)
!18 = !DIDerivedType(tag: DW_TAG_typedef, name: "inside", scope: !15, file: !7, line: 2, baseType: !12)

outside has no scope field.

!11 = !DIDerivedType(tag: DW_TAG_typedef, name: "outside", file: !7, line: 8, baseType: !12)

@llvmbot
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llvmbot commented May 8, 2024

@llvm/issue-subscribers-clang-codegen

Author: Orlando Cazalet-Hyams (OCHyams)

Clang trunk built at d4cf20c (19.0)

Godbolt version of example below https://godbolt.org/z/7esxK8dbY

$ cat test.cpp

struct X {
  typedef int inside;
  inside i;
};

template &lt;typename T = int&gt;
struct Y {
  typedef int outside;
  outside o;
};

X x;
Y&lt;&gt; y;

The DIE for outside is scoped to DW_TAG_compile_unit (0x0000000b) while the DIE for inside is scoped to its enclosing DW_TAG_structure_type (0x00000033). outside should be scoped to the DW_TAG_structure_type DIE for Y&lt;int&gt; (0x00000070).

$ clang -O0 -g test.cpp -o - | llvm-dwarfdump -

0x00000000: Compile Unit: length = 0x00000097, format = DWARF32, version = 0x0004, abbr_offset = 0x0000, addr_size = 0x08 (next unit at 0x0000009b)

0x0000000b: DW_TAG_compile_unit
              DW_AT_producer	("clang version 19.0.0git (https://github.com/llvm/llvm-project.git d4cf20ca37160cb062a9db773d0e6255d6bbc31a)")
              DW_AT_language	(DW_LANG_C_plus_plus_14)
              DW_AT_name	("test.cpp")
              DW_AT_stmt_list	(0x00000000)
              DW_AT_comp_dir	("/")

0x0000001e:   DW_TAG_variable
                DW_AT_name	("x")
                DW_AT_type	(0x00000033 "X")
                DW_AT_external	(true)
                DW_AT_decl_file	("test.cpp")
                DW_AT_decl_line	(12)
                DW_AT_location	(DW_OP_addr 0x0)

0x00000033:   DW_TAG_structure_type
                DW_AT_calling_convention	(DW_CC_pass_by_value)
                DW_AT_name	("X")
                DW_AT_byte_size	(0x04)
                DW_AT_decl_file	("test.cpp")
                DW_AT_decl_line	(1)

0x0000003c:     DW_TAG_member
                  DW_AT_name	("i")
                  DW_AT_type	(0x00000048 "inside")
                  DW_AT_decl_file	("test.cpp")
                  DW_AT_decl_line	(3)
                  DW_AT_data_member_location	(0x00)

0x00000048:     DW_TAG_typedef
                  DW_AT_type	(0x00000054 "int")
                  DW_AT_name	("inside")
                  DW_AT_decl_file	("test.cpp")
                  DW_AT_decl_line	(2)

0x00000053:     NULL

0x00000054:   DW_TAG_base_type
                DW_AT_name	("int")
                DW_AT_encoding	(DW_ATE_signed)
                DW_AT_byte_size	(0x04)

0x0000005b:   DW_TAG_variable
                DW_AT_name	("y")
                DW_AT_type	(0x00000070 "Y&lt;int&gt;")
                DW_AT_external	(true)
                DW_AT_decl_file	("test.cpp")
                DW_AT_decl_line	(13)
                DW_AT_location	(DW_OP_addr 0x0)

0x00000070:   DW_TAG_structure_type
                DW_AT_calling_convention	(DW_CC_pass_by_value)
                DW_AT_name	("Y&lt;int&gt;")
                DW_AT_byte_size	(0x04)
                DW_AT_decl_file	("test.cpp")
                DW_AT_decl_line	(7)

0x00000079:     DW_TAG_template_type_parameter
                  DW_AT_type	(0x00000054 "int")
                  DW_AT_name	("T")
                  DW_AT_default_value	(true)

0x00000082:     DW_TAG_member
                  DW_AT_name	("o")
                  DW_AT_type	(0x0000008f "outside")
                  DW_AT_decl_file	("test.cpp")
                  DW_AT_decl_line	(9)
                  DW_AT_data_member_location	(0x00)

0x0000008e:     NULL

0x0000008f:   DW_TAG_typedef
                DW_AT_type	(0x00000054 "int")
                DW_AT_name	("outside")
                DW_AT_decl_file	("test.cpp")
                DW_AT_decl_line	(8)

0x0000009a:   NULL

Looking at the IR produced by Clang:

$ clang -O0 -g test.cpp -emit-llvm -S -o -

source_filename = "test.cpp"
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

%struct.X = type { i32 }
%struct.Y = type { i32 }

@<!-- -->x = dso_local global %struct.X zeroinitializer, align 4, !dbg !0
@<!-- -->y = dso_local global %struct.Y zeroinitializer, align 4, !dbg !5

!llvm.dbg.cu = !{!2}
!llvm.module.flags = !{!19, !20, !21, !22, !23, !24, !25}
!llvm.ident = !{!26}

!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
!1 = distinct !DIGlobalVariable(name: "x", scope: !2, file: !7, line: 12, type: !15, isLocal: false, isDefinition: true)
!2 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !3, producer: "clang version 19.0.0git (https://github.com/llvm/llvm-project.git d4cf20ca37160cb062a9db773d0e6255d6bbc31a)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, globals: !4, splitDebugInlining: false, nameTableKind: None)
!3 = !DIFile(filename: "test.cpp")
!4 = !{!0, !5}
!5 = !DIGlobalVariableExpression(var: !6, expr: !DIExpression())
!6 = distinct !DIGlobalVariable(name: "y", scope: !2, file: !7, line: 13, type: !8, isLocal: false, isDefinition: true)
!7 = !DIFile(filename: "example.cpp"test.cpp)
!8 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "Y&lt;int&gt;", file: !7, line: 7, size: 32, flags: DIFlagTypePassByValue, elements: !9, templateParams: !13, identifier: "_ZTS1YIiE")
!9 = !{!10}
!10 = !DIDerivedType(tag: DW_TAG_member, name: "o", scope: !8, file: !7, line: 9, baseType: !11, size: 32)
!11 = !DIDerivedType(tag: DW_TAG_typedef, name: "outside", file: !7, line: 8, baseType: !12)
!12 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!13 = !{!14}
!14 = !DITemplateTypeParameter(name: "T", type: !12, defaulted: true)
!15 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "X", file: !7, line: 1, size: 32, flags: DIFlagTypePassByValue, elements: !16, identifier: "_ZTS1X")
!16 = !{!17}
!17 = !DIDerivedType(tag: DW_TAG_member, name: "i", scope: !15, file: !7, line: 3, baseType: !18, size: 32)
!18 = !DIDerivedType(tag: DW_TAG_typedef, name: "inside", scope: !15, file: !7, line: 2, baseType: !12)
!19 = !{i32 7, !"Dwarf Version", i32 4}
!20 = !{i32 2, !"Debug Info Version", i32 3}
!21 = !{i32 1, !"wchar_size", i32 4}
!22 = !{i32 8, !"PIC Level", i32 2}
!23 = !{i32 7, !"PIE Level", i32 2}
!24 = !{i32 7, !"uwtable", i32 2}
!25 = !{i32 7, !"frame-pointer", i32 2}
!26 = !{!"clang version 19.0.0git (https://github.com/llvm/llvm-project.git d4cf20ca37160cb062a9db773d0e6255d6bbc31a)"}

inside has a scope field pointing to X.

!15 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "X", ...)
!18 = !DIDerivedType(tag: DW_TAG_typedef, name: "inside", scope: !15, file: !7, line: 2, baseType: !12)

outside has no scope field.

!11 = !DIDerivedType(tag: DW_TAG_typedef, name: "outside", file: !7, line: 8, baseType: !12)

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@EugeneZelenko @OCHyams @llvmbot