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>
251 lines
11 KiB
ArmAsm
251 lines
11 KiB
ArmAsm
# REQUIRES: x86
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# RUN: llvm-mc -filetype=obj -triple=x86_64 %s -o %t.o
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# RUN: not ld.lld --debug-names %t.o -o /dev/null 2>&1 | \
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# RUN: FileCheck -DFILE=%t.o --implicit-check-not=error: %s
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# CHECK: error: [[FILE]]:(.debug_names): found DWARF64, which is currently unsupported
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.ifdef GEN
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//--- a.cc
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struct t1 {};
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extern "C" void _start(t1) {}
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//--- gen
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clang --target=x86_64-linux -S -g -gpubnames -gdwarf64 a.cc -o -
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.endif
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.text
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.file "a.cc"
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.globl _start # -- Begin function _start
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.p2align 4, 0x90
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.type _start,@function
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_start: # @_start
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.Lfunc_begin0:
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.file 0 "/proc/self/cwd" "a.cc" md5 0x6835f89a7d36054002b51e54e47d852e
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.loc 0 2 0 # a.cc:2:0
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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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.Ltmp0:
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.loc 0 2 29 prologue_end epilogue_begin # a.cc:2:29
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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 _start, .Lfunc_end0-_start
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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 1 # Abbreviation Code
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.byte 17 # DW_TAG_compile_unit
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.byte 1 # DW_CHILDREN_yes
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.byte 37 # DW_AT_producer
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.byte 37 # DW_FORM_strx1
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.byte 19 # DW_AT_language
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.byte 5 # DW_FORM_data2
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.byte 3 # DW_AT_name
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.byte 37 # DW_FORM_strx1
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.byte 114 # DW_AT_str_offsets_base
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.byte 23 # DW_FORM_sec_offset
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.byte 16 # DW_AT_stmt_list
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.byte 23 # DW_FORM_sec_offset
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.byte 27 # DW_AT_comp_dir
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.byte 37 # DW_FORM_strx1
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.byte 17 # DW_AT_low_pc
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.byte 27 # DW_FORM_addrx
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.byte 18 # DW_AT_high_pc
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.byte 6 # DW_FORM_data4
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.byte 115 # DW_AT_addr_base
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.byte 23 # DW_FORM_sec_offset
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.byte 0 # EOM(1)
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.byte 0 # EOM(2)
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.byte 2 # Abbreviation Code
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.byte 46 # DW_TAG_subprogram
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.byte 1 # DW_CHILDREN_yes
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.byte 17 # DW_AT_low_pc
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.byte 27 # DW_FORM_addrx
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.byte 18 # DW_AT_high_pc
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.byte 6 # DW_FORM_data4
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.byte 64 # DW_AT_frame_base
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.byte 24 # DW_FORM_exprloc
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.byte 3 # DW_AT_name
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.byte 37 # DW_FORM_strx1
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.byte 58 # DW_AT_decl_file
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.byte 11 # DW_FORM_data1
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.byte 59 # DW_AT_decl_line
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.byte 11 # DW_FORM_data1
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.byte 63 # DW_AT_external
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.byte 25 # DW_FORM_flag_present
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.byte 0 # EOM(1)
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.byte 0 # EOM(2)
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.byte 3 # Abbreviation Code
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.byte 5 # DW_TAG_formal_parameter
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.byte 0 # DW_CHILDREN_no
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.byte 2 # DW_AT_location
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.byte 24 # DW_FORM_exprloc
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.byte 58 # DW_AT_decl_file
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.byte 11 # DW_FORM_data1
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.byte 59 # DW_AT_decl_line
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.byte 11 # DW_FORM_data1
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.byte 73 # DW_AT_type
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.byte 19 # DW_FORM_ref4
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.byte 0 # EOM(1)
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.byte 0 # EOM(2)
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.byte 4 # Abbreviation Code
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.byte 19 # DW_TAG_structure_type
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.byte 0 # DW_CHILDREN_no
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.byte 54 # DW_AT_calling_convention
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.byte 11 # DW_FORM_data1
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.byte 3 # DW_AT_name
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.byte 37 # DW_FORM_strx1
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.byte 11 # DW_AT_byte_size
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.byte 11 # DW_FORM_data1
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.byte 58 # DW_AT_decl_file
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.byte 11 # DW_FORM_data1
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.byte 59 # DW_AT_decl_line
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.byte 11 # DW_FORM_data1
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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 4294967295 # DWARF64 Mark
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.quad .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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.quad .debug_abbrev # Offset Into Abbrev. Section
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.byte 1 # Abbrev [1] 0x18:0x40 DW_TAG_compile_unit
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.byte 0 # DW_AT_producer
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.short 33 # DW_AT_language
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.byte 1 # DW_AT_name
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.quad .Lstr_offsets_base0 # DW_AT_str_offsets_base
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.quad .Lline_table_start0 # DW_AT_stmt_list
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.byte 2 # DW_AT_comp_dir
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.byte 0 # DW_AT_low_pc
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.long .Lfunc_end0-.Lfunc_begin0 # DW_AT_high_pc
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.quad .Laddr_table_base0 # DW_AT_addr_base
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.byte 2 # Abbrev [2] 0x3b:0x16 DW_TAG_subprogram
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.byte 0 # DW_AT_low_pc
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.long .Lfunc_end0-.Lfunc_begin0 # DW_AT_high_pc
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.byte 1 # DW_AT_frame_base
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.byte 86
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.byte 3 # DW_AT_name
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.byte 0 # DW_AT_decl_file
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.byte 2 # DW_AT_decl_line
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# DW_AT_external
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.byte 3 # Abbrev [3] 0x46:0xa DW_TAG_formal_parameter
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.byte 2 # DW_AT_location
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.byte 145
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.byte 127
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.byte 0 # DW_AT_decl_file
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.byte 2 # DW_AT_decl_line
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.long 81 # DW_AT_type
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.byte 0 # End Of Children Mark
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.byte 4 # Abbrev [4] 0x51:0x6 DW_TAG_structure_type
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.byte 5 # DW_AT_calling_convention
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.byte 4 # DW_AT_name
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.byte 1 # DW_AT_byte_size
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.byte 0 # DW_AT_decl_file
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.byte 1 # DW_AT_decl_line
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.byte 0 # End Of Children Mark
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.Ldebug_info_end0:
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.section .debug_str_offsets,"",@progbits
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.long 4294967295 # DWARF64 Mark
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.quad 44 # 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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.byte 0 # string offset=0
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.Linfo_string1:
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.asciz "a.cc" # string offset=1
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.Linfo_string2:
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.asciz "/proc/self/cwd" # string offset=6
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.Linfo_string3:
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.asciz "_start" # string offset=21
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.Linfo_string4:
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.asciz "t1" # string offset=28
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.section .debug_str_offsets,"",@progbits
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.quad .Linfo_string0
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.quad .Linfo_string1
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.quad .Linfo_string2
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.quad .Linfo_string3
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.quad .Linfo_string4
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.section .debug_addr,"",@progbits
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.long 4294967295 # DWARF64 Mark
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.quad .Ldebug_addr_end0-.Ldebug_addr_start0 # Length of contribution
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.Ldebug_addr_start0:
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.short 5 # DWARF version number
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.byte 8 # Address size
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.byte 0 # Segment selector size
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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 4294967295 # DWARF64 Mark
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.quad .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 2 # Header: bucket count
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.long 2 # 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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.quad .Lcu_begin0 # Compilation unit 0
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.long 1 # Bucket 0
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.long 0 # Bucket 1
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.long 5863786 # Hash in Bucket 0
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.long -304389582 # Hash in Bucket 0
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.quad .Linfo_string4 # String in Bucket 0: t1
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.quad .Linfo_string3 # String in Bucket 0: _start
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.quad .Lnames1-.Lnames_entries0 # Offset in Bucket 0
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.quad .Lnames0-.Lnames_entries0 # Offset in Bucket 0
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.Lnames_abbrev_start0:
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.byte 1 # Abbrev code
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.byte 19 # DW_TAG_structure_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 2 # 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 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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.Lnames1:
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.L1:
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.byte 1 # Abbreviation code
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.long 81 # DW_IDX_die_offset
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.byte 0 # DW_IDX_parent
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# End of list: t1
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.Lnames0:
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.L0:
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.byte 2 # Abbreviation code
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.long 59 # DW_IDX_die_offset
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.byte 0 # DW_IDX_parent
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# End of list: _start
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.p2align 2, 0x0
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.Lnames_end0:
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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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