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16711b431b
`clang -g -gpubnames` (with optional -gsplit-dwarf) creates the
`.debug_names` section ("per-CU" index). By default lld concatenates
input `.debug_names` sections into an output `.debug_names` section.
LLDB can consume the concatenated section but the lookup performance is
not good.
This patch adds --debug-names to create a per-module index by combining
the per-CU indexes into a single index that covers the entire load
module. The produced `.debug_names` is a replacement for `.gdb_index`.
Type units (-fdebug-types-section) are not handled yet.
Co-authored-by: Fangrui Song <i@maskray.me>
---------
Co-authored-by: Fangrui Song <i@maskray.me>
153 lines
6.2 KiB
ArmAsm
153 lines
6.2 KiB
ArmAsm
# This file was generated by:
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# clang++ -g -O0 -S -fdebug-compilation-dir='/proc/self/cwd' -gpubnames a.cpp
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# Then manually changing the first .debug_names abbrev, so that the
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# DW_IDX_die_offset uses DW_FORM_flag_present (invalid) & the DW_IDX_parent
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# uses DW_FORM_ref4. Also updated the sizes of the values in the entry
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# that uses the abbrev, to match the sizes of the forms.
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# Contents of a.cpp
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# int main (int argc, char **argv) { }
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# REQUIRES: x86
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# RUN: llvm-mc -filetype=obj -triple=x86_64 %s -o %t1.o
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# RUN: not ld.lld --debug-names %t1.o -o /dev/null 2>&1 \
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# RUN: | FileCheck -DFILE=%t1.o --implicit-check-not=error: %s
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# CHECK: error: [[FILE]]:(.debug_names): unrecognized form encoding 25 in abbrev table
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.text
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.globl main # -- Begin function main
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.p2align 4, 0x90
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.type main,@function
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main: # @main
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.Lfunc_begin0:
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.cfi_startproc
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# %bb.0: # %entry
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pushq %rbp
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.cfi_def_cfa_offset 16
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.cfi_offset %rbp, -16
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movq %rsp, %rbp
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.cfi_def_cfa_register %rbp
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movl %edi, -4(%rbp)
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movq %rsi, -16(%rbp)
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.Ltmp0:
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xorl %eax, %eax
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popq %rbp
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.cfi_def_cfa %rsp, 8
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retq
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.Ltmp1:
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.Lfunc_end0:
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.size main, .Lfunc_end0-main
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.cfi_endproc
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# -- End function
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.section .debug_abbrev,"",@progbits
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.byte 0 # EOM(1)
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.byte 0 # EOM(2)
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.byte 0 # EOM(3)
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.section .debug_info,"",@progbits
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.Lcu_begin0:
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.long .Ldebug_info_end0-.Ldebug_info_start0 # Length of Unit
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.Ldebug_info_start0:
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.short 5 # DWARF version number
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.byte 1 # DWARF Unit Type
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.byte 8 # Address Size (in bytes)
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.long .debug_abbrev # Offset Into Abbrev. Section
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.Ldebug_info_end0:
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.section .debug_str_offsets,"",@progbits
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.long 36 # Length of String Offsets Set
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.short 5
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.short 0
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.Lstr_offsets_base0:
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.section .debug_str,"MS",@progbits,1
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.Linfo_string0:
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.asciz "clang version 19.0.0git (git@github.com:llvm/llvm-project.git 53b14cd9ce2b57da73d173fc876d2e9e199f5640)" # string offset=0
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.Linfo_string1:
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.asciz "a.cpp" # string offset=104
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.Linfo_string2:
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.asciz "/proc/self/cwd" # string offset=110
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.Linfo_string3:
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.asciz "main" # string offset=125
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.Linfo_string4:
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.asciz "int" # string offset=130
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.Linfo_string5:
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.asciz "argc" # string offset=134
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.Linfo_string6:
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.asciz "argv" # string offset=139
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.Linfo_string7:
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.asciz "char" # string offset=144
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.Laddr_table_base0:
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.quad .Lfunc_begin0
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.Ldebug_addr_end0:
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.section .debug_names,"",@progbits
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.long .Lnames_end0-.Lnames_start0 # Header: unit length
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.Lnames_start0:
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.short 5 # Header: version
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.short 0 # Header: padding
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.long 1 # Header: compilation unit count
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.long 0 # Header: local type unit count
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.long 0 # Header: foreign type unit count
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.long 3 # Header: bucket count
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.long 3 # Header: name count
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.long .Lnames_abbrev_end0-.Lnames_abbrev_start0 # Header: abbreviation table size
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.long 8 # Header: augmentation string size
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.ascii "LLVM0700" # Header: augmentation string
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.long .Lcu_begin0 # Compilation unit 0
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.long 0 # Bucket 0
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.long 1 # Bucket 1
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.long 2 # Bucket 2
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.long 2090499946 # Hash in Bucket 1
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.long 193495088 # Hash in Bucket 2
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.long 2090147939 # Hash in Bucket 2
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.long .Linfo_string3 # String in Bucket 1: main
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.long .Linfo_string4 # String in Bucket 2: int
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.long .Linfo_string7 # String in Bucket 2: char
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.long .Lnames0-.Lnames_entries0 # Offset in Bucket 1
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.long .Lnames1-.Lnames_entries0 # Offset in Bucket 2
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.long .Lnames2-.Lnames_entries0 # Offset in Bucket 2
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.Lnames_abbrev_start0:
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.byte 1 # Abbrev code
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.byte 46 # DW_TAG_subprogram
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.byte 3 # DW_IDX_die_offset
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.byte 25 # DW_FORM_flag_present
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.byte 4 # DW_IDX_parent
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.byte 19 # DW_FORM_ref4
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.byte 0 # End of abbrev
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.byte 0 # End of abbrev
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.byte 2 # Abbrev code
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.byte 36 # DW_TAG_base_type
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.byte 3 # DW_IDX_die_offset
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.byte 19 # DW_FORM_ref4
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.byte 4 # DW_IDX_parent
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.byte 25 # DW_FORM_flag_present
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.byte 0 # End of abbrev
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.byte 0 # End of abbrev
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.byte 0 # End of abbrev list
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.Lnames_abbrev_end0:
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.Lnames_entries0:
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.Lnames0:
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.L1:
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.byte 1 # Abbreviation code
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.byte 35 # DW_IDX_die_offset
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.long 0 # DW_IDX_parent
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# End of list: main
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.Lnames1:
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.L0:
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.byte 2 # Abbreviation code
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.long 73 # DW_IDX_die_offset
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.byte 0 # DW_IDX_parent
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# End of list: int
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.Lnames2:
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.L2:
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.byte 2 # Abbreviation code
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.long 87 # DW_IDX_die_offset
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.byte 0 # DW_IDX_parent
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# End of list: char
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.p2align 2, 0x0
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.Lnames_end0:
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.ident "clang version 19.0.0git (git@github.com:llvm/llvm-project.git 53b14cd9ce2b57da73d173fc876d2e9e199f5640)"
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.section ".note.GNU-stack","",@progbits
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.addrsig
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.section .debug_line,"",@progbits
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.Lline_table_start0:
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