diff --git a/lldb/source/Plugins/SymbolFile/DWARF/DWARFUnit.h b/lldb/source/Plugins/SymbolFile/DWARF/DWARFUnit.h --- a/lldb/source/Plugins/SymbolFile/DWARF/DWARFUnit.h +++ b/lldb/source/Plugins/SymbolFile/DWARF/DWARFUnit.h @@ -65,6 +65,7 @@ } uint64_t GetTypeHash() const { return m_type_hash; } dw_offset_t GetTypeOffset() const { return m_type_offset; } + uint64_t GetDWOId() const { return m_dwo_id; } bool IsTypeUnit() const { return m_unit_type == DW_UT_type || m_unit_type == DW_UT_split_type; } @@ -88,6 +89,7 @@ virtual ~DWARFUnit(); bool IsDWOUnit() { return m_is_dwo; } + uint64_t GetDWOId(); void ExtractUnitDIEIfNeeded(); void ExtractDIEsIfNeeded(); @@ -333,6 +335,8 @@ const DIERef::Section m_section; bool m_is_dwo; + /// Value of DW_AT_GNU_dwo_id (v4) or dwo_id from CU header (v5). + uint64_t m_dwo_id; private: void ParseProducerInfo(); diff --git a/lldb/source/Plugins/SymbolFile/DWARF/DWARFUnit.cpp b/lldb/source/Plugins/SymbolFile/DWARF/DWARFUnit.cpp --- a/lldb/source/Plugins/SymbolFile/DWARF/DWARFUnit.cpp +++ b/lldb/source/Plugins/SymbolFile/DWARF/DWARFUnit.cpp @@ -34,7 +34,8 @@ const DWARFAbbreviationDeclarationSet &abbrevs, DIERef::Section section, bool is_dwo) : UserID(uid), m_dwarf(dwarf), m_header(header), m_abbrevs(&abbrevs), - m_cancel_scopes(false), m_section(section), m_is_dwo(is_dwo) {} + m_cancel_scopes(false), m_section(section), m_is_dwo(is_dwo), + m_dwo_id(header.GetDWOId()) {} DWARFUnit::~DWARFUnit() = default; @@ -284,6 +285,11 @@ SetStrOffsetsBase(baseOffset); } +uint64_t DWARFUnit::GetDWOId() { + ExtractUnitDIEIfNeeded(); + return m_dwo_id; +} + // m_die_array_mutex must be already held as read/write. void DWARFUnit::AddUnitDIE(const DWARFDebugInfoEntry &cu_die) { llvm::Optional addr_base, gnu_addr_base, ranges_base, @@ -337,6 +343,9 @@ case DW_AT_GNU_ranges_base: gnu_ranges_base = form_value.Unsigned(); break; + case DW_AT_GNU_dwo_id: + m_dwo_id = form_value.Unsigned(); + break; } } @@ -350,9 +359,8 @@ if (!dwo_symbol_file) return; - uint64_t main_dwo_id = - cu_die.GetAttributeValueAsUnsigned(this, DW_AT_GNU_dwo_id, 0); - DWARFUnit *dwo_cu = dwo_symbol_file->GetDWOCompileUnitForHash(main_dwo_id); + DWARFUnit *dwo_cu = dwo_symbol_file->GetDWOCompileUnitForHash(m_dwo_id); + if (!dwo_cu) return; // Can't fetch the compile unit from the dwo file. dwo_cu->SetUserData(this); @@ -788,7 +796,8 @@ header.m_unit_type = data.GetU8(offset_ptr); header.m_addr_size = data.GetU8(offset_ptr); header.m_abbr_offset = data.GetDWARFOffset(offset_ptr); - if (header.m_unit_type == llvm::dwarf::DW_UT_skeleton) + if (header.m_unit_type == llvm::dwarf::DW_UT_skeleton || + header.m_unit_type == llvm::dwarf::DW_UT_split_compile) header.m_dwo_id = data.GetU64(offset_ptr); } else { header.m_abbr_offset = data.GetDWARFOffset(offset_ptr); diff --git a/lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARFDwo.cpp b/lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARFDwo.cpp --- a/lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARFDwo.cpp +++ b/lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARFDwo.cpp @@ -49,8 +49,7 @@ DWARFCompileUnit *cu = FindSingleCompileUnit(); if (!cu) return nullptr; - if (hash != - cu->GetUnitDIEOnly().GetAttributeValueAsUnsigned(DW_AT_GNU_dwo_id, 0)) + if (hash != cu->GetDWOId()) return nullptr; return cu; } diff --git a/lldb/test/Shell/SymbolFile/DWARF/dwarf5-split.s b/lldb/test/Shell/SymbolFile/DWARF/dwarf5-split.s new file mode 100644 --- /dev/null +++ b/lldb/test/Shell/SymbolFile/DWARF/dwarf5-split.s @@ -0,0 +1,235 @@ +## This test checks that lldb reads debug info from a dwp file when the dwo_id +## is in a DWARF5 CU header instead of a DW_AT_GNU_dwo_id attribute. + +# RUN: llvm-mc --filetype=obj --triple x86_64 %s -o %t --defsym MAIN=1 +# RUN: llvm-mc --filetype=obj --triple x86_64 %s -o %t.dwp +# RUN: %lldb %t -o "target variable i" -b | FileCheck %s +# CHECK: (int) i = 42 + +.ifdef MAIN +## Main file + .text + .globl main # -- Begin function main +main: # @main +.Lfunc_begin0: + pushq %rbp + movq %rsp, %rbp + xorl %eax, %eax + popq %rbp + retq +.Lfunc_end0: + # -- End function + .data +i: + .long 42 # 0x2a + + + .section .debug_abbrev,"",@progbits + .byte 1 # Abbreviation Code + .byte 74 # DW_TAG_skeleton_unit + .byte 0 # DW_CHILDREN_no + .byte 118 # DW_AT_dwo_name + .byte 8 # DW_FORM_string + .byte 17 # DW_AT_low_pc + .byte 27 # DW_FORM_addrx + .byte 18 # DW_AT_high_pc + .byte 6 # DW_FORM_data4 + .byte 115 # DW_AT_addr_base + .byte 23 # DW_FORM_sec_offset + .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 5 # DWARF version number + .byte 4 # DWARF Unit Type + .byte 8 # Address Size (in bytes) + .long .debug_abbrev # Offset Into Abbrev. Section + .quad 1026699901672188186 # dwo_id + .byte 1 # Abbrev [1] 0x14:0x14 DW_TAG_skeleton_unit + .asciz "hello.dwo" # DW_AT_dwo_name + .byte 1 # DW_AT_low_pc + .long .Lfunc_end0-.Lfunc_begin0 # DW_AT_high_pc + .long .Laddr_table_base0 # DW_AT_addr_base +.Ldebug_info_end0: + + .section .debug_addr,"",@progbits + .long .Ldebug_addr_end0-.Ldebug_addr_start0 # Length of contribution +.Ldebug_addr_start0: + .short 5 # DWARF version number + .byte 8 # Address size + .byte 0 # Segment selector size +.Laddr_table_base0: + .quad i + .quad .Lfunc_begin0 +.Ldebug_addr_end0: + +.else +## DWP file + .section .debug_str_offsets.dwo,"e",@progbits + .long 28 + .short 5 + .short 0 + + + .section .debug_str.dwo,"eMS",@progbits,1 +.Linfo_string0: + .asciz "i" +.Linfo_string1: + .asciz "int" +.Linfo_string2: + .asciz "main" +.Linfo_string3: + .asciz "hand-tuned clang output" +.Linfo_string4: + .asciz "hello.c" +.Linfo_string5: + .asciz "hello.dwo" + + + .section .debug_str_offsets.dwo,"e",@progbits + .long .Linfo_string0-.debug_str.dwo + .long .Linfo_string1-.debug_str.dwo + .long .Linfo_string2-.debug_str.dwo + .long .Linfo_string3-.debug_str.dwo + .long .Linfo_string4-.debug_str.dwo + .long .Linfo_string5-.debug_str.dwo +.Lstr_offsets_end: + + + .section .debug_info.dwo,"e",@progbits + .long .Ldebug_info_dwo_end0-.Ldebug_info_dwo_start0 # Length of Unit +.Ldebug_info_dwo_start0: + .short 5 # DWARF version number + .byte 5 # DWARF Unit Type + .byte 8 # Address Size (in bytes) + .long 0 # Offset Into Abbrev. Section + .quad 1026699901672188186 # dwo_id + .byte 1 # Abbrev [1] 0x14:0x25 DW_TAG_compile_unit + .byte 3 # DW_AT_producer + .short 12 # DW_AT_language + .byte 4 # DW_AT_name + .byte 5 # DW_AT_dwo_name + .byte 2 # Abbrev [2] 0x1a:0xb DW_TAG_variable + .byte 0 # DW_AT_name + .long 37 # DW_AT_type + # DW_AT_external + .byte 0 # DW_AT_decl_file + .byte 2 # DW_AT_decl_line + .byte 2 # DW_AT_location + .byte 161 + .byte 0 + .byte 3 # Abbrev [3] 0x25:0x4 DW_TAG_base_type + .byte 1 # DW_AT_name + .byte 5 # DW_AT_encoding + .byte 4 # DW_AT_byte_size + .byte 4 # Abbrev [4] 0x29:0xf DW_TAG_subprogram + .byte 1 # DW_AT_low_pc + .long 8 # DW_AT_high_pc + .byte 1 # DW_AT_frame_base + .byte 86 + .byte 2 # DW_AT_name + .byte 0 # DW_AT_decl_file + .byte 3 # DW_AT_decl_line + .long 37 # DW_AT_type + # DW_AT_external + .byte 0 # End Of Children Mark +.Ldebug_info_dwo_end0: + + + .section .debug_abbrev.dwo,"e",@progbits + .byte 1 # Abbreviation Code + .byte 17 # DW_TAG_compile_unit + .byte 1 # DW_CHILDREN_yes + .byte 37 # DW_AT_producer + .byte 37 # DW_FORM_strx1 + .byte 19 # DW_AT_language + .byte 5 # DW_FORM_data2 + .byte 3 # DW_AT_name + .byte 37 # DW_FORM_strx1 + .byte 118 # DW_AT_dwo_name + .byte 37 # DW_FORM_strx1 + .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 37 # DW_FORM_strx1 + .byte 73 # DW_AT_type + .byte 19 # DW_FORM_ref4 + .byte 63 # DW_AT_external + .byte 25 # DW_FORM_flag_present + .byte 58 # DW_AT_decl_file + .byte 11 # DW_FORM_data1 + .byte 59 # DW_AT_decl_line + .byte 11 # DW_FORM_data1 + .byte 2 # DW_AT_location + .byte 24 # DW_FORM_exprloc + .byte 0 # EOM(1) + .byte 0 # EOM(2) + .byte 3 # Abbreviation Code + .byte 36 # DW_TAG_base_type + .byte 0 # DW_CHILDREN_no + .byte 3 # DW_AT_name + .byte 37 # DW_FORM_strx1 + .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 4 # Abbreviation Code + .byte 46 # DW_TAG_subprogram + .byte 0 # DW_CHILDREN_no + .byte 17 # DW_AT_low_pc + .byte 27 # DW_FORM_addrx + .byte 18 # DW_AT_high_pc + .byte 6 # DW_FORM_data4 + .byte 64 # DW_AT_frame_base + .byte 24 # DW_FORM_exprloc + .byte 3 # DW_AT_name + .byte 37 # DW_FORM_strx1 + .byte 58 # DW_AT_decl_file + .byte 11 # DW_FORM_data1 + .byte 59 # DW_AT_decl_line + .byte 11 # DW_FORM_data1 + .byte 73 # DW_AT_type + .byte 19 # DW_FORM_ref4 + .byte 63 # DW_AT_external + .byte 25 # DW_FORM_flag_present + .byte 0 # EOM(1) + .byte 0 # EOM(2) + .byte 0 # EOM(3) +.Ldebug_abbrev_end: + +.section .debug_cu_index,"",@progbits +.short 5 # DWARF version number +.short 0 # Reserved +.long 3 # Section count +.long 1 # Unit count +.long 2 # Slot count + +.quad 1026699901672188186, 0 # Hash table +.long 1, 0 # Index table + +## Table header +.long 1 # DW_SECT_INFO +.long 3 # DW_SECT_ABBREV +.long 6 # DW_SECT_STR_OFFSETS + +## Offsets +.long 0 # offset into .debug_info.dwo +.long 0 # offset into .debug_abbrev.dwo +.long 0 # offset into .debug_str_offsets.dwo + +## Sizes +.long .Ldebug_info_dwo_end0 - .debug_info.dwo +.long .Ldebug_abbrev_end - .debug_abbrev.dwo +.long .Lstr_offsets_end - .debug_str_offsets.dwo + +.endif