53a483cee8
Now, if the offset overflow happens, we just silently ignore it. We will generate a bad dwp file, which will crash the gdb or make it undefined behavior, and hard to address the root cause. So, we need to produce some messages if overflow happens. Reviewed By: ayermolo, dblaikie, steven.zhang Differential Revision: https://reviews.llvm.org/D144565
217 lines
9.2 KiB
ArmAsm
217 lines
9.2 KiB
ArmAsm
# Note: This file is compiled from the following code, for
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# the purpose of creating an overflowed dwo section.
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# After being compiled from source, section `.debug_info.dwo`
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# is changed to have length (2^32 - 30) Bytes, and added
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# padding with `.fill` directive, so it is likely to
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# overflow when packed with other files.
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#
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# clang -g -S -gsplit-dwarf -gdwarf-5 hello.c
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#
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# #include <stdio.h>
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# void hello() {
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# printf("hello\n");
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# }
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.text
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.file "hello.c"
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.globl hello # -- Begin function hello
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.p2align 4, 0x90
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.type hello,@function
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hello: # @hello
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.Lfunc_begin0:
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.file 0 "/xxxx/xxxxxxxxxx/xxxxxxxx/hello" "hello.c" md5 0x0b447232502f439981a2fe9f11255f42
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.loc 0 3 0 # hello.c:3:0
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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 4 5 prologue_end # hello.c:4:5
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movabsq $.L.str, %rdi
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movb $0, %al
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callq printf
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.loc 0 5 1 # hello.c:5:1
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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 hello, .Lfunc_end0-hello
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.cfi_endproc
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# -- End function
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.type .L.str,@object # @.str
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.section .rodata.str1.1,"aMS",@progbits,1
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.L.str:
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.asciz "hello\n"
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.size .L.str, 7
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.section .debug_abbrev,"",@progbits
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.byte 1 # Abbreviation Code
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.byte 74 # DW_TAG_skeleton_unit
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.byte 0 # DW_CHILDREN_no
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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 114 # DW_AT_str_offsets_base
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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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.ascii "\264B" # DW_AT_GNU_pubnames
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.byte 25 # DW_FORM_flag_present
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.byte 118 # DW_AT_dwo_name
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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 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 4 # 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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.quad -94954012350180462
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.byte 1 # Abbrev [1] 0x14:0x14 DW_TAG_skeleton_unit
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.long .Lline_table_start0 # DW_AT_stmt_list
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.long .Lstr_offsets_base0 # DW_AT_str_offsets_base
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.byte 0 # DW_AT_comp_dir
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# DW_AT_GNU_pubnames
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.byte 1 # DW_AT_dwo_name
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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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.long .Laddr_table_base0 # DW_AT_addr_base
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.Ldebug_info_end0:
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.section .debug_str_offsets,"",@progbits
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.long 12
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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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.Lskel_string0:
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.asciz "/xxxx/xxxxxxxxxx/xxxxxxxx/hello" # string offset=0
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.Lskel_string1:
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.asciz "hello.dwo" # string offset=32
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.section .debug_str_offsets,"",@progbits
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.long .Lskel_string0
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.long .Lskel_string1
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.section .debug_str_offsets.dwo,"e",@progbits
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.long 20
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.short 5
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.short 0
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.section .debug_str.dwo,"eMS",@progbits,1
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.Linfo_string0:
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.asciz "hello" # string offset=0
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.Linfo_string1:
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.asciz "clang version 11.1.0 (https://github.com/llvm/llvm-project.git 1a0dc1e010bf5c8034bd4a53340fc0dc3e90549a)" # string offset=6
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.Linfo_string2:
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.asciz "hello.c" # string offset=111
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.Linfo_string3:
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.asciz "hello.dwo" # string offset=119
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.section .debug_str_offsets.dwo,"e",@progbits
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.long 0
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.long 6
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.long 111
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.long 119
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.section .debug_info.dwo,"e",@progbits
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.long .Ldebug_info_dwo_end0-.Ldebug_info_dwo_start0 # Length of Unit
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.Ldebug_info_dwo_start0:
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.short 5 # DWARF version number
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.byte 5 # DWARF Unit Type
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.byte 8 # Address Size (in bytes)
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.long 0 # Offset Into Abbrev. Section
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.quad -94954012350180462
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.byte 1 # Abbrev [1] 0x14:0x12 DW_TAG_compile_unit
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.byte 1 # DW_AT_producer
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.short 12 # DW_AT_language
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.byte 2 # DW_AT_name
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.byte 3 # DW_AT_dwo_name
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.byte 2 # Abbrev [2] 0x1a:0xb 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 0 # DW_AT_name
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.byte 0 # DW_AT_decl_file
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.byte 3 # DW_AT_decl_line
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# DW_AT_external
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.byte 0 # End Of Children Mark
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.fill 4294967233
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.Ldebug_info_dwo_end0:
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.section .debug_abbrev.dwo,"e",@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 118 # DW_AT_dwo_name
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.byte 37 # DW_FORM_strx1
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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 0 # DW_CHILDREN_no
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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 0 # EOM(3)
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.section .debug_addr,"",@progbits
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.long .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_gnu_pubnames,"",@progbits
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.long .LpubNames_end0-.LpubNames_begin0 # Length of Public Names Info
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.LpubNames_begin0:
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.short 2 # DWARF Version
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.long .Lcu_begin0 # Offset of Compilation Unit Info
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.long 40 # Compilation Unit Length
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.long 26 # DIE offset
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.byte 48 # Attributes: FUNCTION, EXTERNAL
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.asciz "hello" # External Name
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.long 0 # End Mark
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.LpubNames_end0:
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.section .debug_gnu_pubtypes,"",@progbits
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.long .LpubTypes_end0-.LpubTypes_begin0 # Length of Public Types Info
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.LpubTypes_begin0:
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.short 2 # DWARF Version
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.long .Lcu_begin0 # Offset of Compilation Unit Info
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.long 40 # Compilation Unit Length
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.long 0 # End Mark
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.LpubTypes_end0:
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.ident "clang version 11.1.0 (https://github.com/llvm/llvm-project.git 1a0dc1e010bf5c8034bd4a53340fc0dc3e90549a)"
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.section ".note.GNU-stack","",@progbits
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.addrsig
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.addrsig_sym printf
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.section .debug_line,"",@progbits
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.Lline_table_start0:
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