llvm/test/tools/llvm-symbolizer/split-dwarf-zero-signature-not-found.s

   1 ## This test checks that looking up a zero hash in the .debug_cu_index hash
   2 ## table works correctly when there's no CU with signature = 0.
   3 ##
   4 ## LLVM used to check just the signature bits to decide if the hash lookup ended
   5 ## at a match or at an empty slot. This is wrong when signature = 0 because
   6 ## empty slots have all zeros in the signature field too, and LLVM would return
   7 ## the empty slot as a valid result.
   8
   9 # REQUIRES: x86-registered-target
  10
  11 # RUN: llvm-mc --filetype=obj --triple x86_64 %s -o %t --defsym MAIN=0
  12 # RUN: llvm-mc --filetype=obj --triple x86_64 %s -o %t.dwp
  13 # RUN: llvm-symbolizer --obj=%t --dwp=%t.dwp 0x0 | FileCheck %s
  14
  15 ## This expected output is very uninteresting, but it's better than a crash.
  16 # CHECK: ??:0:0
  17
  18         .section        .debug_abbrev,"",@progbits
  19         .byte   1                       # Abbreviation Code
  20         .byte   17                      # DW_TAG_compile_unit
  21         .byte   0                       # DW_CHILDREN_no
  22         .ascii  "\260B"                 # DW_AT_GNU_dwo_name
  23         .byte   8                       # DW_FORM_string
  24         .ascii  "\261B"                 # DW_AT_GNU_dwo_id
  25         .byte   7                       # DW_FORM_data8
  26         .ascii  "\263B"                 # DW_AT_GNU_addr_base
  27         .byte   23                      # DW_FORM_sec_offset
  28         .byte   85                      # DW_AT_ranges
  29         .byte   23                      # DW_FORM_sec_offset
  30         .byte   0                       # EOM(1)
  31         .byte   0                       # EOM(2)
  32         .byte   0                       # EOM(3)
  33
  34 ## Create two CUs, with dwo_ids 0 and 1 respectively.
  35 .ifdef MAIN
  36 .irpc I,01
  37         .data
  38 A\I:
  39         .long \I
  40
  41         .text
  42 F\I:
  43         nop
  44
  45         .section        .debug_info,"",@progbits
  46 .Lcu_begin\I:
  47         .long   .Ldebug_info_end\I-.Ldebug_info_start\I # Length of Unit
  48 .Ldebug_info_start\I:
  49         .short  4                       # DWARF version number
  50         .long   .debug_abbrev           # Offset Into Abbrev. Section
  51         .byte   8                       # Address Size (in bytes)
  52         .byte   1                       # Abbrev [1] 0xb:0x25 DW_TAG_compile_unit
  53         .asciz  "A.dwo"                 # DW_AT_GNU_dwo_name
  54         .quad   \I                      # DW_AT_GNU_dwo_id
  55         .long   .debug_addr             # DW_AT_GNU_addr_base
  56         .long   .Lranges\I              # DW_AT_ranges
  57 .Ldebug_info_end\I:
  58
  59         .section        .debug_addr,"",@progbits
  60         .quad   A\I
  61         .quad   F\I
  62
  63         .section        .debug_ranges,"",@progbits
  64 .Lranges\I:
  65         .quad   F\I
  66         .quad   F\I+1
  67         .quad   0
  68         .quad   0
  69 .endr
  70 .else
  71 ## Deliberately omit compile unit 0 in the DWP. We want to check the case where
  72 ## a signature = 0 matches an empty hash slot in .debug_cu_index and the index
  73 ## in the parallel table has to be checked.
  74         .section        .debug_abbrev.dwo,"e",@progbits
  75 .Labbrev1:
  76         .byte   1                       # Abbreviation Code
  77         .byte   17                      # DW_TAG_compile_unit
  78         .byte   0                       # DW_CHILDREN_no
  79         .byte   37                      # DW_AT_producer
  80         .byte   8                       # DW_FORM_string
  81         .byte   3                       # DW_AT_name
  82         .byte   8                       # DW_FORM_string
  83         .byte   0                       # EOM(1)
  84         .byte   0                       # EOM(2)
  85         .byte   0                       # EOM(3)
  86 .Labbrev_end1:
  87
  88         .section        .debug_info.dwo,"e",@progbits
  89 .Lcu_begin1:
  90         .long   .Ldebug_info_end1-.Ldebug_info_start1 # Length of Unit
  91 .Ldebug_info_start1:
  92         .short  4                       # DWARF version number
  93         .long   0                       # Offset Into Abbrev. Section
  94         .byte   8                       # Address Size (in bytes)
  95         .byte   1                       # Abbrev DW_TAG_compile_unit
  96         .asciz  "Hand-written DWARF"    # DW_AT_producer
  97         .byte   '1', '.', 'c', 0        # DW_AT_name
  98 .Ldebug_info_end1:
  99
 100         .section        .debug_cu_index,"",@progbits
 101         .long   2                       # DWARF version number
 102         .long   2                       # Section count
 103         .long   1                       # Unit count
 104         .long   8                       # Slot count
 105
 106         .quad   1, 0, 0, 0, 0, 0, 0, 0  # Hash table
 107         .long   1, 0, 0, 0, 0, 0, 0, 0  # Index table
 108
 109         .long   1                       # DW_SECT_INFO
 110         .long   3                       # DW_SECT_ABBREV
 111
 112         .long .Lcu_begin1-.debug_info.dwo
 113         .long .Labbrev1-.debug_abbrev.dwo
 114
 115         .long .Ldebug_info_end1-.Lcu_begin1
 116         .long .Labbrev_end1-.Labbrev1
 117
 118 .endif