lldb/test/Shell/SymbolFile/DWARF/x86/DW_AT_const_value.s

   1 # Test handling of (optimized-out/location-less) variables whose value is
   2 # specified by DW_AT_const_value
   3
   4 # RUN: llvm-mc -filetype=obj -triple x86_64-pc-linux %s -o %t
   5 # RUN: %lldb %t \
   6 # RUN:   -o "target variable udata data1 data2 data4 data8 string strp ref4 udata_ptr" \
   7 # RUN:   -o exit | FileCheck %s
   8
   9 # CHECK-LABEL: target variable
  10 ## Variable specified via DW_FORM_udata. This is typical for clang (10).
  11 # CHECK: (unsigned long) udata = 4742474247424742
  12 ## Variables specified via fixed-size forms. This is typical for gcc (9).
  13 # CHECK: (unsigned long) data1 = 47
  14 # CHECK: (unsigned long) data2 = 4742
  15 # CHECK: (unsigned long) data4 = 47424742
  16 # CHECK: (unsigned long) data8 = 4742474247424742
  17 ## Variables specified using string forms. This behavior purely speculative -- I
  18 ## don't know of any compiler that would represent character strings this way.
  19 # CHECK: (char[7]) string = "string"
  20 # CHECK: (char[7]) strp = "strp"
  21 ## Bogus attribute form. Let's make sure we don't crash at least.
  22 # CHECK: (char[7]) ref4 = <empty constant data>
  23 ## A variable of pointer type.
  24 # CHECK: (unsigned long *) udata_ptr = 0xdeadbeefbaadf00d
  25
  26         .section        .debug_abbrev,"",@progbits
  27         .byte   1                       # Abbreviation Code
  28         .byte   17                      # DW_TAG_compile_unit
  29         .byte   1                       # DW_CHILDREN_yes
  30         .byte   37                      # DW_AT_producer
  31         .byte   8                       # DW_FORM_string
  32         .byte   3                       # DW_AT_name
  33         .byte   8                       # DW_FORM_string
  34         .byte   0                       # EOM(1)
  35         .byte   0                       # EOM(2)
  36         .byte   2                       # Abbreviation Code
  37         .byte   15                      # DW_TAG_pointer_type
  38         .byte   0                       # DW_CHILDREN_no
  39         .byte   73                      # DW_AT_type
  40         .byte   19                      # DW_FORM_ref4
  41         .byte   0                       # EOM(1)
  42         .byte   0                       # EOM(2)
  43         .byte   4                       # Abbreviation Code
  44         .byte   1                       # DW_TAG_array_type
  45         .byte   1                       # DW_CHILDREN_yes
  46         .byte   73                      # DW_AT_type
  47         .byte   19                      # DW_FORM_ref4
  48         .byte   0                       # EOM(1)
  49         .byte   0                       # EOM(2)
  50         .byte   5                       # Abbreviation Code
  51         .byte   33                      # DW_TAG_subrange_type
  52         .byte   0                       # DW_CHILDREN_no
  53         .byte   73                      # DW_AT_type
  54         .byte   19                      # DW_FORM_ref4
  55         .byte   55                      # DW_AT_count
  56         .byte   11                      # DW_FORM_data1
  57         .byte   0                       # EOM(1)
  58         .byte   0                       # EOM(2)
  59         .byte   6                       # Abbreviation Code
  60         .byte   36                      # DW_TAG_base_type
  61         .byte   0                       # DW_CHILDREN_no
  62         .byte   3                       # DW_AT_name
  63         .byte   8                       # DW_FORM_string
  64         .byte   11                      # DW_AT_byte_size
  65         .byte   11                      # DW_FORM_data1
  66         .byte   62                      # DW_AT_encoding
  67         .byte   11                      # DW_FORM_data1
  68         .byte   0                       # EOM(1)
  69         .byte   0                       # EOM(2)
  70 .macro var code, form
  71         .byte   \code                   # Abbreviation Code
  72         .byte   52                      # DW_TAG_variable
  73         .byte   0                       # DW_CHILDREN_no
  74         .byte   3                       # DW_AT_name
  75         .byte   8                       # DW_FORM_string
  76         .byte   73                      # DW_AT_type
  77         .byte   19                      # DW_FORM_ref4
  78         .byte   28                      # DW_AT_const_value
  79         .byte   \form
  80         .byte   0                       # EOM(1)
  81         .byte   0                       # EOM(2)
  82 .endm
  83         var 10, 0xf                     # DW_FORM_udata
  84         var 11, 0xb                     # DW_FORM_data1
  85         var 12, 0x5                     # DW_FORM_data2
  86         var 13, 0x6                     # DW_FORM_data4
  87         var 14, 0x7                     # DW_FORM_data8
  88         var 15, 0x8                     # DW_FORM_string
  89         var 16, 0xe                     # DW_FORM_strp
  90         var 17, 0x13                    # DW_FORM_ref4
  91         .byte   0                       # EOM(3)
  92         .section        .debug_info,"",@progbits
  93 .Lcu_begin0:
  94         .long   .Ldebug_info_end0-.Ldebug_info_start0 # Length of Unit
  95 .Ldebug_info_start0:
  96         .short  4                       # DWARF version number
  97         .long   .debug_abbrev           # Offset Into Abbrev. Section
  98         .byte   8                       # Address Size (in bytes)
  99         .byte   1                       # Abbrev DW_TAG_compile_unit
 100         .asciz  "Hand-written DWARF"    # DW_AT_producer
 101         .asciz  "const.c"               # DW_AT_name
 102 .Lchar_arr:
 103         .byte   4                       # Abbrev DW_TAG_array_type
 104         .long   .Lchar-.Lcu_begin0      # DW_AT_type
 105         .byte   5                       # Abbrev DW_TAG_subrange_type
 106         .long   .Lulong-.Lcu_begin0     # DW_AT_type
 107         .byte   7                       # DW_AT_count
 108         .byte   0                       # End Of Children Mark
 109 .Lchar:
 110         .byte   6                       # Abbrev DW_TAG_base_type
 111         .asciz  "char"                  # DW_AT_name
 112         .byte   1                       # DW_AT_byte_size
 113         .byte   6                       # DW_AT_encoding
 114 .Lulong:
 115         .byte   6                       # Abbrev DW_TAG_base_type
 116         .asciz  "unsigned long"         # DW_AT_name
 117         .byte   8                       # DW_AT_byte_size
 118         .byte   7                       # DW_AT_encoding
 119 .Lulong_ptr:
 120         .byte   2                       # Abbrev DW_TAG_pointer_type
 121         .long   .Lulong-.Lcu_begin0     # DW_AT_type
 122
 123         .byte   10                      # Abbrev DW_TAG_variable
 124         .asciz  "udata"                 # DW_AT_name
 125         .long   .Lulong-.Lcu_begin0     # DW_AT_type
 126         .uleb128 4742474247424742       # DW_AT_const_value
 127
 128         .byte   11                      # Abbrev DW_TAG_variable
 129         .asciz  "data1"                 # DW_AT_name
 130         .long   .Lulong-.Lcu_begin0     # DW_AT_type
 131         .byte   47                      # DW_AT_const_value
 132
 133         .byte   12                      # Abbrev DW_TAG_variable
 134         .asciz  "data2"                 # DW_AT_name
 135         .long   .Lulong-.Lcu_begin0     # DW_AT_type
 136         .word   4742                    # DW_AT_const_value
 137
 138         .byte   13                      # Abbrev DW_TAG_variable
 139         .asciz  "data4"                 # DW_AT_name
 140         .long   .Lulong-.Lcu_begin0     # DW_AT_type
 141         .long   47424742                # DW_AT_const_value
 142
 143         .byte   14                      # Abbrev DW_TAG_variable
 144         .asciz  "data8"                 # DW_AT_name
 145         .long   .Lulong-.Lcu_begin0     # DW_AT_type
 146         .quad   4742474247424742        # DW_AT_const_value
 147
 148         .byte   15                      # Abbrev DW_TAG_variable
 149         .asciz  "string"                # DW_AT_name
 150         .long   .Lchar_arr-.Lcu_begin0  # DW_AT_type
 151         .asciz  "string"                # DW_AT_const_value
 152
 153         .byte   16                      # Abbrev DW_TAG_variable
 154         .asciz  "strp"                  # DW_AT_name
 155         .long   .Lchar_arr-.Lcu_begin0  # DW_AT_type
 156         .long   .Lstrp                  # DW_AT_const_value
 157
 158         .byte   17                      # Abbrev DW_TAG_variable
 159         .asciz  "ref4"                  # DW_AT_name
 160         .long   .Lchar_arr-.Lcu_begin0  # DW_AT_type
 161         .long   .Lulong-.Lcu_begin0     # DW_AT_const_value
 162
 163         .byte   10                      # Abbrev DW_TAG_variable
 164         .asciz  "udata_ptr"             # DW_AT_name
 165         .long   .Lulong_ptr-.Lcu_begin0 # DW_AT_type
 166         .uleb128 0xdeadbeefbaadf00d     # DW_AT_const_value
 167
 168         .byte   0                       # End Of Children Mark
 169 .Ldebug_info_end0:
 170
 171         .section        .debug_str,"MS",@progbits,1
 172 .Lstrp:
 173         .asciz "strp"