llvm/test/tools/llvm-dwarfdump/X86/debug-abbrev.s

   1 ## Show that llvm-dwarfdump prints a range of different structures in the
   2 ## .debug_abbrev section when requested. As well as basic cases, this test also
   3 ## shows how llvm-dwarfdump handles unknown tag, attribute and form values.
   4
   5 # RUN: llvm-mc %s -filetype obj -triple x86_64-pc-linux -o %t.o
   6 # RUN: llvm-dwarfdump --debug-abbrev %t.o | FileCheck %s --match-full-lines
   7
   8 # CHECK:      .debug_abbrev contents:
   9 # CHECK-NEXT: Abbrev table for offset: 0x00000000
  10 # CHECK-NEXT: [66] DW_TAG_compile_unit        DW_CHILDREN_yes
  11 # CHECK-NEXT:         DW_AT_name      DW_FORM_string
  12 # CHECK-NEXT:         DW_AT_stmt_list DW_FORM_data2
  13 # CHECK-EMPTY:
  14 # CHECK-NEXT: [128] DW_TAG_unknown_ffff       DW_CHILDREN_no
  15 # CHECK-NEXT:         DW_AT_unknown_5 DW_FORM_unknown_2
  16 # CHECK-EMPTY:
  17 # CHECK-NEXT: [66] DW_TAG_unknown_4080        DW_CHILDREN_no
  18 # CHECK-EMPTY:
  19 # CHECK-NEXT: [1] DW_TAG_unknown_4000 DW_CHILDREN_no
  20 # CHECK-NEXT:         DW_AT_unknown_2000      DW_FORM_unknown_ffff
  21 # CHECK-NEXT:         DW_AT_unknown_3fff      DW_FORM_unknown_7f
  22 # CHECK-NEXT:         DW_AT_unknown_1fff      DW_FORM_block2
  23 # CHECK-NEXT:         DW_AT_unknown_4000      DW_FORM_block4
  24 # CHECK-EMPTY:
  25 # CHECK-NEXT: [2] DW_TAG_unknown_407f DW_CHILDREN_no
  26 # CHECK-EMPTY:
  27 # CHECK-NEXT: Abbrev table for offset: 0x00000038
  28 # CHECK-NEXT: [66] DW_TAG_entry_point DW_CHILDREN_no
  29 # CHECK-NEXT:         DW_AT_elemental DW_FORM_flag_present
  30
  31 ## All values in this assembly are intended to be arbitrary, except where
  32 ## specified.
  33 .section .debug_abbrev,"",@progbits
  34     .byte 0x42 ## Abbreviation Code
  35     ## Known tag with children and known attributes and forms.
  36     .byte 0x11 ## DW_TAG_compile_unit
  37     .byte 0x01 ## DW_CHILDREN_yes
  38         .byte 0x03 ## DW_AT_name
  39         .byte 0x08 ## DW_FORM_string (valid form for DW_AT_name).
  40         .byte 0x10 ## DW_AT_stmt_list
  41         .byte 0x05 ## DW_FORM_data2 (invalid form for DW_AT_stmt_list).
  42         .byte 0, 0 ## End of attributes
  43
  44     ## Tag without children and reserved form/attribute values.
  45     .byte 0x80, 0x01       ## Multi-byte Abbreviation Code
  46     .byte 0xFF, 0xFF, 0x03 ## 0xFFFF == DW_TAG_hi_user
  47     .byte 0x00             ## DW_CHILDREN_no
  48         ## Reserved attribute and form.
  49         .byte 0x05 ## Reserved DW_AT_*
  50         .byte 0x02 ## Reserved DW_FORM_*
  51         .byte 0, 0 ## End of attributes.
  52
  53     ## Tag with no attributes.
  54     .byte 0x42             ## Abbreviation Code (duplicate)
  55     .byte 0x80, 0x81, 0x01 ## 0x4080 == DW_TAG_lo_user
  56     .byte 0x00             ## DW_CHILDREN_no
  57         .byte 0, 0         ## End of attributes.
  58
  59     ## Tag with attributes/forms with unknown values/values in user-defined ranges.
  60     .byte 0x01                 ## Abbreviation Code
  61     ## FIXME: https://bugs.llvm.org/show_bug.cgi?id=44258 means that 0x80, 0x80, 0x04
  62     ## results in a failure to parse correctly, whilst the following tag value is
  63     ## interpreted incorrectly as 0x4000.
  64     .byte 0x80, 0x80, 0x05     ## 0x10001 == DW_TAG_hi_user + 2
  65     .byte 0x00                 ## DW_CHILDREN_no
  66         .byte 0x80, 0x40       ## 0x2000 == DW_AT_lo_user
  67         .byte 0xFF, 0xFF, 0x03 ## 0xFFFF == Unknown multi-byte form.
  68         .byte 0xFF, 0x7F       ## DW_AT_hi_user
  69         .byte 0x7F             ## Unknown single-byte form.
  70         .byte 0xFF, 0x3F       ## DW_AT_lo_user - 1
  71         .byte 0x03             ## DW_FORM_block2
  72         .byte 0x80, 0x80, 0x01 ## DW_AT_hi_user + 1
  73         .byte 0x04             ## DW_FORM_block4
  74         .byte 0, 0             ## End of attributes.
  75
  76     ## Tag with invalid children encoding.
  77     .byte 0x02             ## Abbreviation Code
  78     .byte 0xFF, 0x80, 0x01 ## 0x407F == DW_TAG_lo_user - 1
  79     .byte 0x02 ## Invalid children encoding (interpreted as DW_CHILDREN_no).
  80         .byte 0, 0         ## End of attributes.
  81
  82     .byte 0 ## End of first abbreviation set.
  83
  84     ## Second .debug_abbrev set.
  85     .byte 0x42 ## Abbreviation Code (duplicate in different unit)
  86     .byte 0x03 ## DW_TAG_entry_point
  87     .byte 0x00 ## DW_CHILDREN_no
  88         .byte 0x66 ## DW_AT_elemental
  89         .byte 0x19 ## DW_FORM_flag_present
  90         .byte 0, 0 ## End of attributes.
  91
  92     .byte 0 # End of second abbreviation set.