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[lldb/DWARF] Respect member layout for types parsed through declarations (#110648) #9710

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Merged
merged 1 commit into from
Dec 10, 2024
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[lldb/DWARF] Respect member layout for types parsed through declarations (#110648) #9710

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12 changes: 4 additions & 8 deletions lldb/source/Plugins/SymbolFile/DWARF/DWARFASTParserClang.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2356,14 +2356,10 @@ bool DWARFASTParserClang::CompleteRecordType(const DWARFDIE &die,
TypeSystemClang::BuildIndirectFields(clang_type);
TypeSystemClang::CompleteTagDeclarationDefinition(clang_type);

if (type)
layout_info.bit_size = type->GetByteSize(nullptr).value_or(0) * 8;
if (layout_info.bit_size == 0)
layout_info.bit_size =
die.GetAttributeValueAsUnsigned(DW_AT_byte_size, 0) * 8;
if (layout_info.alignment == 0)
layout_info.alignment =
die.GetAttributeValueAsUnsigned(llvm::dwarf::DW_AT_alignment, 0) * 8;
layout_info.bit_size =
die.GetAttributeValueAsUnsigned(DW_AT_byte_size, 0) * 8;
layout_info.alignment =
die.GetAttributeValueAsUnsigned(llvm::dwarf::DW_AT_alignment, 0) * 8;

clang::CXXRecordDecl *record_decl =
m_ast.GetAsCXXRecordDecl(clang_type.GetOpaqueQualType());
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132 changes: 132 additions & 0 deletions lldb/test/Shell/SymbolFile/DWARF/x86/DW_AT_declaration-unusual-layout.s
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Original file line number Diff line number Diff line change
@@ -0,0 +1,132 @@
## Test that lldb respects the layout defined in DWARF even when starting out
## with a declaration of the class.

# RUN: split-file %s %t
# RUN: llvm-mc --triple x86_64-pc-linux %t/asm --filetype=obj -o %t.o
# RUN: %lldb -s %t/commands -o exit %t.o 2>&1 | FileCheck %s

#--- commands
target var a -fx
# CHECK-LABEL: target var a
# CHECK: (A) a = (i = 0xbaadf00d)

#--- asm
.data
.p2align 4
.long 0
a:
.long 0xdeadbeef
.long 0xbaadf00d

.section .debug_abbrev,"",@progbits
.byte 1 # Abbreviation Code
.byte 17 # DW_TAG_compile_unit
.byte 1 # DW_CHILDREN_yes
.byte 37 # DW_AT_producer
.byte 8 # DW_FORM_string
.byte 0 # EOM(1)
.byte 0 # EOM(2)
.byte 2 # Abbreviation Code
.byte 52 # DW_TAG_variable
.byte 0 # DW_CHILDREN_no
.byte 3 # DW_AT_name
.byte 8 # DW_FORM_string
.byte 73 # DW_AT_type
.byte 19 # DW_FORM_ref4
.byte 2 # DW_AT_location
.byte 24 # DW_FORM_exprloc
.byte 0 # EOM(1)
.byte 0 # EOM(2)
.byte 3 # Abbreviation Code
.byte 19 # DW_TAG_structure_type
.byte 0 # DW_CHILDREN_no
.byte 3 # DW_AT_name
.byte 8 # DW_FORM_string
.byte 60 # DW_AT_declaration
.byte 25 # DW_FORM_flag_present
.byte 0 # EOM(1)
.byte 0 # EOM(2)
.byte 4 # Abbreviation Code
.byte 19 # DW_TAG_structure_type
.byte 1 # DW_CHILDREN_yes
.byte 3 # DW_AT_name
.byte 8 # DW_FORM_string
.byte 11 # DW_AT_byte_size
.byte 11 # DW_FORM_data1
.byte 0 # EOM(1)
.byte 0 # EOM(2)
.byte 5 # Abbreviation Code
.byte 13 # DW_TAG_member
.byte 0 # DW_CHILDREN_no
.byte 3 # DW_AT_name
.byte 8 # DW_FORM_string
.byte 73 # DW_AT_type
.byte 19 # DW_FORM_ref4
.byte 56 # DW_AT_data_member_location
.byte 11 # DW_FORM_data1
.byte 0 # EOM(1)
.byte 0 # EOM(2)
.byte 6 # Abbreviation Code
.byte 36 # DW_TAG_base_type
.byte 0 # DW_CHILDREN_no
.byte 3 # DW_AT_name
.byte 8 # DW_FORM_string
.byte 62 # DW_AT_encoding
.byte 11 # DW_FORM_data1
.byte 11 # DW_AT_byte_size
.byte 11 # DW_FORM_data1
.byte 0 # EOM(1)
.byte 0 # EOM(2)
.byte 0 # EOM(3)

.section .debug_info,"",@progbits
.Lcu_begin0:
.long .Ldebug_info_end0-.Ldebug_info_start0 # Length of Unit
.Ldebug_info_start0:
.short 4 # DWARF version number
.long .debug_abbrev # Offset Into Abbrev. Section
.byte 8 # Address Size (in bytes)
.byte 1 # Abbrev [1] DW_TAG_compile_unit
.asciz "Hand-written DWARF" # DW_AT_producer

.byte 2 # Abbrev [2] DW_TAG_variable
.asciz "a" # DW_AT_name
.long .LA_decl-.Lcu_begin0 # DW_AT_type
.byte 9 # DW_AT_location
.byte 3
.quad a
.LA_decl:
.byte 3 # Abbrev [3] DW_TAG_structure_type
.asciz "A" # DW_AT_name
# DW_AT_declaration
.byte 0 # End Of Children Mark
.Ldebug_info_end0:

.Lcu_begin1:
.long .Ldebug_info_end1-.Ldebug_info_start1 # Length of Unit
.Ldebug_info_start1:
.short 4 # DWARF version number
.long .debug_abbrev # Offset Into Abbrev. Section
.byte 8 # Address Size (in bytes)
.byte 1 # Abbrev [1] DW_TAG_compile_unit
.asciz "Hand-written DWARF" # DW_AT_producer

.byte 4 # Abbrev [4] DW_TAG_structure_type
.asciz "A" # DW_AT_name
# DW_AT_declaration
.byte 8 # DW_AT_byte_size
.byte 5 # Abbrev [5] DW_TAG_member
.asciz "i" # DW_AT_name
.long .Lint-.Lcu_begin1 # DW_AT_type
## NB: empty padding before this member
.byte 4 # DW_AT_data_member_location
.byte 0 # End Of Children Mark

.Lint:
.byte 6 # Abbrev [6] DW_TAG_base_type
.asciz "int" # DW_AT_name
.byte 5 # DW_AT_encoding
.byte 4 # DW_AT_byte_size

.byte 0 # End Of Children Mark
.Ldebug_info_end1:
3 changes: 3 additions & 0 deletions lldb/test/Shell/SymbolFile/DWARF/x86/DW_AT_declaration-with-children.s
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Original file line number Diff line number Diff line change
Expand Up @@ -105,6 +105,8 @@ c1:
.byte 1 # DW_CHILDREN_yes
.byte 3 # DW_AT_name
.byte 8 # DW_FORM_string
.byte 11 # DW_AT_byte_size
.byte 11 # DW_FORM_data1
.byte 0 # EOM(1)
.byte 0 # EOM(2)
.byte 7 # Abbreviation Code
Expand Down Expand Up @@ -251,6 +253,7 @@ c1:
.LB1:
.byte 6 # Abbrev [6] DW_TAG_class_type
.asciz "B1" # DW_AT_name
.byte 8 # DW_AT_byte_size
.byte 7 # Abbrev [5] 0x58:0xc DW_TAG_member
.asciz "ptr" # DW_AT_name
.long .LAptr # DW_AT_type
Expand Down