dwarf_defs.go raw

   1  // Copyright 2010 The Go Authors. All rights reserved.
   2  // Use of this source code is governed by a BSD-style
   3  // license that can be found in the LICENSE file.
   4  
   5  package dwarf
   6  
   7  // Cut, pasted, tr-and-awk'ed from tables in
   8  // http://dwarfstd.org/doc/Dwarf3.pdf
   9  
  10  // Table 18
  11  const (
  12  	DW_TAG_array_type               = 0x01
  13  	DW_TAG_class_type               = 0x02
  14  	DW_TAG_entry_point              = 0x03
  15  	DW_TAG_enumeration_type         = 0x04
  16  	DW_TAG_formal_parameter         = 0x05
  17  	DW_TAG_imported_declaration     = 0x08
  18  	DW_TAG_label                    = 0x0a
  19  	DW_TAG_lexical_block            = 0x0b
  20  	DW_TAG_member                   = 0x0d
  21  	DW_TAG_pointer_type             = 0x0f
  22  	DW_TAG_reference_type           = 0x10
  23  	DW_TAG_compile_unit             = 0x11
  24  	DW_TAG_string_type              = 0x12
  25  	DW_TAG_structure_type           = 0x13
  26  	DW_TAG_subroutine_type          = 0x15
  27  	DW_TAG_typedef                  = 0x16
  28  	DW_TAG_union_type               = 0x17
  29  	DW_TAG_unspecified_parameters   = 0x18
  30  	DW_TAG_variant                  = 0x19
  31  	DW_TAG_common_block             = 0x1a
  32  	DW_TAG_common_inclusion         = 0x1b
  33  	DW_TAG_inheritance              = 0x1c
  34  	DW_TAG_inlined_subroutine       = 0x1d
  35  	DW_TAG_module                   = 0x1e
  36  	DW_TAG_ptr_to_member_type       = 0x1f
  37  	DW_TAG_set_type                 = 0x20
  38  	DW_TAG_subrange_type            = 0x21
  39  	DW_TAG_with_stmt                = 0x22
  40  	DW_TAG_access_declaration       = 0x23
  41  	DW_TAG_base_type                = 0x24
  42  	DW_TAG_catch_block              = 0x25
  43  	DW_TAG_const_type               = 0x26
  44  	DW_TAG_constant                 = 0x27
  45  	DW_TAG_enumerator               = 0x28
  46  	DW_TAG_file_type                = 0x29
  47  	DW_TAG_friend                   = 0x2a
  48  	DW_TAG_namelist                 = 0x2b
  49  	DW_TAG_namelist_item            = 0x2c
  50  	DW_TAG_packed_type              = 0x2d
  51  	DW_TAG_subprogram               = 0x2e
  52  	DW_TAG_template_type_parameter  = 0x2f
  53  	DW_TAG_template_value_parameter = 0x30
  54  	DW_TAG_thrown_type              = 0x31
  55  	DW_TAG_try_block                = 0x32
  56  	DW_TAG_variant_part             = 0x33
  57  	DW_TAG_variable                 = 0x34
  58  	DW_TAG_volatile_type            = 0x35
  59  	// Dwarf3
  60  	DW_TAG_dwarf_procedure  = 0x36
  61  	DW_TAG_restrict_type    = 0x37
  62  	DW_TAG_interface_type   = 0x38
  63  	DW_TAG_namespace        = 0x39
  64  	DW_TAG_imported_module  = 0x3a
  65  	DW_TAG_unspecified_type = 0x3b
  66  	DW_TAG_partial_unit     = 0x3c
  67  	DW_TAG_imported_unit    = 0x3d
  68  	DW_TAG_condition        = 0x3f
  69  	DW_TAG_shared_type      = 0x40
  70  	// Dwarf4
  71  	DW_TAG_type_unit             = 0x41
  72  	DW_TAG_rvalue_reference_type = 0x42
  73  	DW_TAG_template_alias        = 0x43
  74  
  75  	// User defined
  76  	DW_TAG_lo_user = 0x4080
  77  	DW_TAG_hi_user = 0xffff
  78  )
  79  
  80  // Table 19
  81  const (
  82  	DW_CHILDREN_no  = 0x00
  83  	DW_CHILDREN_yes = 0x01
  84  )
  85  
  86  // Not from the spec, but logically belongs here
  87  const (
  88  	DW_CLS_ADDRESS = 0x01 + iota
  89  	DW_CLS_BLOCK
  90  	DW_CLS_CONSTANT
  91  	DW_CLS_FLAG
  92  	DW_CLS_PTR // lineptr, loclistptr, macptr, rangelistptr
  93  	DW_CLS_REFERENCE
  94  	DW_CLS_ADDRLOC
  95  	DW_CLS_STRING
  96  
  97  	// Go-specific internal hackery.
  98  	DW_CLS_GO_TYPEREF
  99  )
 100  
 101  // Table 20
 102  const (
 103  	DW_AT_sibling              = 0x01 // reference
 104  	DW_AT_location             = 0x02 // block, loclistptr
 105  	DW_AT_name                 = 0x03 // string
 106  	DW_AT_ordering             = 0x09 // constant
 107  	DW_AT_byte_size            = 0x0b // block, constant, reference
 108  	DW_AT_bit_offset           = 0x0c // block, constant, reference
 109  	DW_AT_bit_size             = 0x0d // block, constant, reference
 110  	DW_AT_stmt_list            = 0x10 // lineptr
 111  	DW_AT_low_pc               = 0x11 // address
 112  	DW_AT_high_pc              = 0x12 // address
 113  	DW_AT_language             = 0x13 // constant
 114  	DW_AT_discr                = 0x15 // reference
 115  	DW_AT_discr_value          = 0x16 // constant
 116  	DW_AT_visibility           = 0x17 // constant
 117  	DW_AT_import               = 0x18 // reference
 118  	DW_AT_string_length        = 0x19 // block, loclistptr
 119  	DW_AT_common_reference     = 0x1a // reference
 120  	DW_AT_comp_dir             = 0x1b // string
 121  	DW_AT_const_value          = 0x1c // block, constant, string
 122  	DW_AT_containing_type      = 0x1d // reference
 123  	DW_AT_default_value        = 0x1e // reference
 124  	DW_AT_inline               = 0x20 // constant
 125  	DW_AT_is_optional          = 0x21 // flag
 126  	DW_AT_lower_bound          = 0x22 // block, constant, reference
 127  	DW_AT_producer             = 0x25 // string
 128  	DW_AT_prototyped           = 0x27 // flag
 129  	DW_AT_return_addr          = 0x2a // block, loclistptr
 130  	DW_AT_start_scope          = 0x2c // constant
 131  	DW_AT_bit_stride           = 0x2e // constant
 132  	DW_AT_upper_bound          = 0x2f // block, constant, reference
 133  	DW_AT_abstract_origin      = 0x31 // reference
 134  	DW_AT_accessibility        = 0x32 // constant
 135  	DW_AT_address_class        = 0x33 // constant
 136  	DW_AT_artificial           = 0x34 // flag
 137  	DW_AT_base_types           = 0x35 // reference
 138  	DW_AT_calling_convention   = 0x36 // constant
 139  	DW_AT_count                = 0x37 // block, constant, reference
 140  	DW_AT_data_member_location = 0x38 // block, constant, loclistptr
 141  	DW_AT_decl_column          = 0x39 // constant
 142  	DW_AT_decl_file            = 0x3a // constant
 143  	DW_AT_decl_line            = 0x3b // constant
 144  	DW_AT_declaration          = 0x3c // flag
 145  	DW_AT_discr_list           = 0x3d // block
 146  	DW_AT_encoding             = 0x3e // constant
 147  	DW_AT_external             = 0x3f // flag
 148  	DW_AT_frame_base           = 0x40 // block, loclistptr
 149  	DW_AT_friend               = 0x41 // reference
 150  	DW_AT_identifier_case      = 0x42 // constant
 151  	DW_AT_macro_info           = 0x43 // macptr
 152  	DW_AT_namelist_item        = 0x44 // block
 153  	DW_AT_priority             = 0x45 // reference
 154  	DW_AT_segment              = 0x46 // block, loclistptr
 155  	DW_AT_specification        = 0x47 // reference
 156  	DW_AT_static_link          = 0x48 // block, loclistptr
 157  	DW_AT_type                 = 0x49 // reference
 158  	DW_AT_use_location         = 0x4a // block, loclistptr
 159  	DW_AT_variable_parameter   = 0x4b // flag
 160  	DW_AT_virtuality           = 0x4c // constant
 161  	DW_AT_vtable_elem_location = 0x4d // block, loclistptr
 162  	// Dwarf3
 163  	DW_AT_allocated      = 0x4e // block, constant, reference
 164  	DW_AT_associated     = 0x4f // block, constant, reference
 165  	DW_AT_data_location  = 0x50 // block
 166  	DW_AT_byte_stride    = 0x51 // block, constant, reference
 167  	DW_AT_entry_pc       = 0x52 // address
 168  	DW_AT_use_UTF8       = 0x53 // flag
 169  	DW_AT_extension      = 0x54 // reference
 170  	DW_AT_ranges         = 0x55 // rangelistptr
 171  	DW_AT_trampoline     = 0x56 // address, flag, reference, string
 172  	DW_AT_call_column    = 0x57 // constant
 173  	DW_AT_call_file      = 0x58 // constant
 174  	DW_AT_call_line      = 0x59 // constant
 175  	DW_AT_description    = 0x5a // string
 176  	DW_AT_binary_scale   = 0x5b // constant
 177  	DW_AT_decimal_scale  = 0x5c // constant
 178  	DW_AT_small          = 0x5d // reference
 179  	DW_AT_decimal_sign   = 0x5e // constant
 180  	DW_AT_digit_count    = 0x5f // constant
 181  	DW_AT_picture_string = 0x60 // string
 182  	DW_AT_mutable        = 0x61 // flag
 183  	DW_AT_threads_scaled = 0x62 // flag
 184  	DW_AT_explicit       = 0x63 // flag
 185  	DW_AT_object_pointer = 0x64 // reference
 186  	DW_AT_endianity      = 0x65 // constant
 187  	DW_AT_elemental      = 0x66 // flag
 188  	DW_AT_pure           = 0x67 // flag
 189  	DW_AT_recursive      = 0x68 // flag
 190  
 191  	DW_AT_lo_user = 0x2000 // ---
 192  	DW_AT_hi_user = 0x3fff // ---
 193  )
 194  
 195  // Table 21
 196  const (
 197  	DW_FORM_addr      = 0x01 // address
 198  	DW_FORM_block2    = 0x03 // block
 199  	DW_FORM_block4    = 0x04 // block
 200  	DW_FORM_data2     = 0x05 // constant
 201  	DW_FORM_data4     = 0x06 // constant, lineptr, loclistptr, macptr, rangelistptr
 202  	DW_FORM_data8     = 0x07 // constant, lineptr, loclistptr, macptr, rangelistptr
 203  	DW_FORM_string    = 0x08 // string
 204  	DW_FORM_block     = 0x09 // block
 205  	DW_FORM_block1    = 0x0a // block
 206  	DW_FORM_data1     = 0x0b // constant
 207  	DW_FORM_flag      = 0x0c // flag
 208  	DW_FORM_sdata     = 0x0d // constant
 209  	DW_FORM_strp      = 0x0e // string
 210  	DW_FORM_udata     = 0x0f // constant
 211  	DW_FORM_ref_addr  = 0x10 // reference
 212  	DW_FORM_ref1      = 0x11 // reference
 213  	DW_FORM_ref2      = 0x12 // reference
 214  	DW_FORM_ref4      = 0x13 // reference
 215  	DW_FORM_ref8      = 0x14 // reference
 216  	DW_FORM_ref_udata = 0x15 // reference
 217  	DW_FORM_indirect  = 0x16 // (see Section 7.5.3)
 218  	// Dwarf4
 219  	DW_FORM_sec_offset   = 0x17 // lineptr, loclistptr, macptr, rangelistptr
 220  	DW_FORM_exprloc      = 0x18 // exprloc
 221  	DW_FORM_flag_present = 0x19 // flag
 222  	DW_FORM_ref_sig8     = 0x20 // reference
 223  	// Pseudo-form: expanded to data4 on IOS, udata elsewhere.
 224  	DW_FORM_udata_pseudo = 0x99
 225  )
 226  
 227  // Table 24 (#operands, notes)
 228  const (
 229  	DW_OP_addr                = 0x03 // 1 constant address (size target specific)
 230  	DW_OP_deref               = 0x06 // 0
 231  	DW_OP_const1u             = 0x08 // 1 1-byte constant
 232  	DW_OP_const1s             = 0x09 // 1 1-byte constant
 233  	DW_OP_const2u             = 0x0a // 1 2-byte constant
 234  	DW_OP_const2s             = 0x0b // 1 2-byte constant
 235  	DW_OP_const4u             = 0x0c // 1 4-byte constant
 236  	DW_OP_const4s             = 0x0d // 1 4-byte constant
 237  	DW_OP_const8u             = 0x0e // 1 8-byte constant
 238  	DW_OP_const8s             = 0x0f // 1 8-byte constant
 239  	DW_OP_constu              = 0x10 // 1 ULEB128 constant
 240  	DW_OP_consts              = 0x11 // 1 SLEB128 constant
 241  	DW_OP_dup                 = 0x12 // 0
 242  	DW_OP_drop                = 0x13 // 0
 243  	DW_OP_over                = 0x14 // 0
 244  	DW_OP_pick                = 0x15 // 1 1-byte stack index
 245  	DW_OP_swap                = 0x16 // 0
 246  	DW_OP_rot                 = 0x17 // 0
 247  	DW_OP_xderef              = 0x18 // 0
 248  	DW_OP_abs                 = 0x19 // 0
 249  	DW_OP_and                 = 0x1a // 0
 250  	DW_OP_div                 = 0x1b // 0
 251  	DW_OP_minus               = 0x1c // 0
 252  	DW_OP_mod                 = 0x1d // 0
 253  	DW_OP_mul                 = 0x1e // 0
 254  	DW_OP_neg                 = 0x1f // 0
 255  	DW_OP_not                 = 0x20 // 0
 256  	DW_OP_or                  = 0x21 // 0
 257  	DW_OP_plus                = 0x22 // 0
 258  	DW_OP_plus_uconst         = 0x23 // 1 ULEB128 addend
 259  	DW_OP_shl                 = 0x24 // 0
 260  	DW_OP_shr                 = 0x25 // 0
 261  	DW_OP_shra                = 0x26 // 0
 262  	DW_OP_xor                 = 0x27 // 0
 263  	DW_OP_skip                = 0x2f // 1 signed 2-byte constant
 264  	DW_OP_bra                 = 0x28 // 1 signed 2-byte constant
 265  	DW_OP_eq                  = 0x29 // 0
 266  	DW_OP_ge                  = 0x2a // 0
 267  	DW_OP_gt                  = 0x2b // 0
 268  	DW_OP_le                  = 0x2c // 0
 269  	DW_OP_lt                  = 0x2d // 0
 270  	DW_OP_ne                  = 0x2e // 0
 271  	DW_OP_lit0                = 0x30 // 0 ...
 272  	DW_OP_lit31               = 0x4f // 0 literals 0..31 = (DW_OP_lit0 + literal)
 273  	DW_OP_reg0                = 0x50 // 0 ..
 274  	DW_OP_reg31               = 0x6f // 0 reg 0..31 = (DW_OP_reg0 + regnum)
 275  	DW_OP_breg0               = 0x70 // 1 ...
 276  	DW_OP_breg31              = 0x8f // 1 SLEB128 offset base register 0..31 = (DW_OP_breg0 + regnum)
 277  	DW_OP_regx                = 0x90 // 1 ULEB128 register
 278  	DW_OP_fbreg               = 0x91 // 1 SLEB128 offset
 279  	DW_OP_bregx               = 0x92 // 2 ULEB128 register followed by SLEB128 offset
 280  	DW_OP_piece               = 0x93 // 1 ULEB128 size of piece addressed
 281  	DW_OP_deref_size          = 0x94 // 1 1-byte size of data retrieved
 282  	DW_OP_xderef_size         = 0x95 // 1 1-byte size of data retrieved
 283  	DW_OP_nop                 = 0x96 // 0
 284  	DW_OP_push_object_address = 0x97 // 0
 285  	DW_OP_call2               = 0x98 // 1 2-byte offset of DIE
 286  	DW_OP_call4               = 0x99 // 1 4-byte offset of DIE
 287  	DW_OP_call_ref            = 0x9a // 1 4- or 8-byte offset of DIE
 288  	DW_OP_form_tls_address    = 0x9b // 0
 289  	DW_OP_call_frame_cfa      = 0x9c // 0
 290  	DW_OP_bit_piece           = 0x9d // 2
 291  	DW_OP_lo_user             = 0xe0
 292  	DW_OP_hi_user             = 0xff
 293  )
 294  
 295  // Table 25
 296  const (
 297  	DW_ATE_address         = 0x01
 298  	DW_ATE_boolean         = 0x02
 299  	DW_ATE_complex_float   = 0x03
 300  	DW_ATE_float           = 0x04
 301  	DW_ATE_signed          = 0x05
 302  	DW_ATE_signed_char     = 0x06
 303  	DW_ATE_unsigned        = 0x07
 304  	DW_ATE_unsigned_char   = 0x08
 305  	DW_ATE_imaginary_float = 0x09
 306  	DW_ATE_packed_decimal  = 0x0a
 307  	DW_ATE_numeric_string  = 0x0b
 308  	DW_ATE_edited          = 0x0c
 309  	DW_ATE_signed_fixed    = 0x0d
 310  	DW_ATE_unsigned_fixed  = 0x0e
 311  	DW_ATE_decimal_float   = 0x0f
 312  	DW_ATE_lo_user         = 0x80
 313  	DW_ATE_hi_user         = 0xff
 314  )
 315  
 316  // Table 26
 317  const (
 318  	DW_DS_unsigned           = 0x01
 319  	DW_DS_leading_overpunch  = 0x02
 320  	DW_DS_trailing_overpunch = 0x03
 321  	DW_DS_leading_separate   = 0x04
 322  	DW_DS_trailing_separate  = 0x05
 323  )
 324  
 325  // Table 27
 326  const (
 327  	DW_END_default = 0x00
 328  	DW_END_big     = 0x01
 329  	DW_END_little  = 0x02
 330  	DW_END_lo_user = 0x40
 331  	DW_END_hi_user = 0xff
 332  )
 333  
 334  // Table 28
 335  const (
 336  	DW_ACCESS_public    = 0x01
 337  	DW_ACCESS_protected = 0x02
 338  	DW_ACCESS_private   = 0x03
 339  )
 340  
 341  // Table 29
 342  const (
 343  	DW_VIS_local     = 0x01
 344  	DW_VIS_exported  = 0x02
 345  	DW_VIS_qualified = 0x03
 346  )
 347  
 348  // Table 30
 349  const (
 350  	DW_VIRTUALITY_none         = 0x00
 351  	DW_VIRTUALITY_virtual      = 0x01
 352  	DW_VIRTUALITY_pure_virtual = 0x02
 353  )
 354  
 355  // Table 31
 356  const (
 357  	DW_LANG_C89         = 0x0001
 358  	DW_LANG_C           = 0x0002
 359  	DW_LANG_Ada83       = 0x0003
 360  	DW_LANG_C_plus_plus = 0x0004
 361  	DW_LANG_Cobol74     = 0x0005
 362  	DW_LANG_Cobol85     = 0x0006
 363  	DW_LANG_Fortran77   = 0x0007
 364  	DW_LANG_Fortran90   = 0x0008
 365  	DW_LANG_Pascal83    = 0x0009
 366  	DW_LANG_Modula2     = 0x000a
 367  	// Dwarf3
 368  	DW_LANG_Java           = 0x000b
 369  	DW_LANG_C99            = 0x000c
 370  	DW_LANG_Ada95          = 0x000d
 371  	DW_LANG_Fortran95      = 0x000e
 372  	DW_LANG_PLI            = 0x000f
 373  	DW_LANG_ObjC           = 0x0010
 374  	DW_LANG_ObjC_plus_plus = 0x0011
 375  	DW_LANG_UPC            = 0x0012
 376  	DW_LANG_D              = 0x0013
 377  	// Dwarf4
 378  	DW_LANG_Python = 0x0014
 379  	// Dwarf5
 380  	DW_LANG_Go = 0x0016
 381  
 382  	DW_LANG_lo_user = 0x8000
 383  	DW_LANG_hi_user = 0xffff
 384  )
 385  
 386  // Table 32
 387  const (
 388  	DW_ID_case_sensitive   = 0x00
 389  	DW_ID_up_case          = 0x01
 390  	DW_ID_down_case        = 0x02
 391  	DW_ID_case_insensitive = 0x03
 392  )
 393  
 394  // Table 33
 395  const (
 396  	DW_CC_normal  = 0x01
 397  	DW_CC_program = 0x02
 398  	DW_CC_nocall  = 0x03
 399  	DW_CC_lo_user = 0x40
 400  	DW_CC_hi_user = 0xff
 401  )
 402  
 403  // Table 34
 404  const (
 405  	DW_INL_not_inlined          = 0x00
 406  	DW_INL_inlined              = 0x01
 407  	DW_INL_declared_not_inlined = 0x02
 408  	DW_INL_declared_inlined     = 0x03
 409  )
 410  
 411  // Table 35
 412  const (
 413  	DW_ORD_row_major = 0x00
 414  	DW_ORD_col_major = 0x01
 415  )
 416  
 417  // Table 36
 418  const (
 419  	DW_DSC_label = 0x00
 420  	DW_DSC_range = 0x01
 421  )
 422  
 423  // Table 37
 424  const (
 425  	DW_LNS_copy             = 0x01
 426  	DW_LNS_advance_pc       = 0x02
 427  	DW_LNS_advance_line     = 0x03
 428  	DW_LNS_set_file         = 0x04
 429  	DW_LNS_set_column       = 0x05
 430  	DW_LNS_negate_stmt      = 0x06
 431  	DW_LNS_set_basic_block  = 0x07
 432  	DW_LNS_const_add_pc     = 0x08
 433  	DW_LNS_fixed_advance_pc = 0x09
 434  	// Dwarf3
 435  	DW_LNS_set_prologue_end   = 0x0a
 436  	DW_LNS_set_epilogue_begin = 0x0b
 437  	DW_LNS_set_isa            = 0x0c
 438  )
 439  
 440  // Table 38
 441  const (
 442  	DW_LNE_end_sequence = 0x01
 443  	DW_LNE_set_address  = 0x02
 444  	DW_LNE_define_file  = 0x03
 445  	DW_LNE_lo_user      = 0x80
 446  	DW_LNE_hi_user      = 0xff
 447  )
 448  
 449  // Table 39
 450  const (
 451  	DW_MACINFO_define     = 0x01
 452  	DW_MACINFO_undef      = 0x02
 453  	DW_MACINFO_start_file = 0x03
 454  	DW_MACINFO_end_file   = 0x04
 455  	DW_MACINFO_vendor_ext = 0xff
 456  )
 457  
 458  // Table 40.
 459  const (
 460  	// operand,...
 461  	DW_CFA_nop              = 0x00
 462  	DW_CFA_set_loc          = 0x01 // address
 463  	DW_CFA_advance_loc1     = 0x02 // 1-byte delta
 464  	DW_CFA_advance_loc2     = 0x03 // 2-byte delta
 465  	DW_CFA_advance_loc4     = 0x04 // 4-byte delta
 466  	DW_CFA_offset_extended  = 0x05 // ULEB128 register, ULEB128 offset
 467  	DW_CFA_restore_extended = 0x06 // ULEB128 register
 468  	DW_CFA_undefined        = 0x07 // ULEB128 register
 469  	DW_CFA_same_value       = 0x08 // ULEB128 register
 470  	DW_CFA_register         = 0x09 // ULEB128 register, ULEB128 register
 471  	DW_CFA_remember_state   = 0x0a
 472  	DW_CFA_restore_state    = 0x0b
 473  
 474  	DW_CFA_def_cfa            = 0x0c // ULEB128 register, ULEB128 offset
 475  	DW_CFA_def_cfa_register   = 0x0d // ULEB128 register
 476  	DW_CFA_def_cfa_offset     = 0x0e // ULEB128 offset
 477  	DW_CFA_def_cfa_expression = 0x0f // BLOCK
 478  	DW_CFA_expression         = 0x10 // ULEB128 register, BLOCK
 479  	DW_CFA_offset_extended_sf = 0x11 // ULEB128 register, SLEB128 offset
 480  	DW_CFA_def_cfa_sf         = 0x12 // ULEB128 register, SLEB128 offset
 481  	DW_CFA_def_cfa_offset_sf  = 0x13 // SLEB128 offset
 482  	DW_CFA_val_offset         = 0x14 // ULEB128, ULEB128
 483  	DW_CFA_val_offset_sf      = 0x15 // ULEB128, SLEB128
 484  	DW_CFA_val_expression     = 0x16 // ULEB128, BLOCK
 485  
 486  	DW_CFA_lo_user = 0x1c
 487  	DW_CFA_hi_user = 0x3f
 488  
 489  	// Opcodes that take an addend operand.
 490  	DW_CFA_advance_loc = 0x1 << 6 // +delta
 491  	DW_CFA_offset      = 0x2 << 6 // +register (ULEB128 offset)
 492  	DW_CFA_restore     = 0x3 << 6 // +register
 493  )
 494