dwarf_defs.go

     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  	DW_AT_addr_base      = 0x73 // addrptr
   191  
   192  	DW_AT_lo_user = 0x2000 // ---
   193  	DW_AT_hi_user = 0x3fff // ---
   194  )
   195  
   196  // Table 21
   197  const (
   198  	DW_FORM_addr      = 0x01 // address
   199  	DW_FORM_block2    = 0x03 // block
   200  	DW_FORM_block4    = 0x04 // block
   201  	DW_FORM_data2     = 0x05 // constant
   202  	DW_FORM_data4     = 0x06 // constant, lineptr, loclistptr, macptr, rangelistptr
   203  	DW_FORM_data8     = 0x07 // constant, lineptr, loclistptr, macptr, rangelistptr
   204  	DW_FORM_string    = 0x08 // string
   205  	DW_FORM_block     = 0x09 // block
   206  	DW_FORM_block1    = 0x0a // block
   207  	DW_FORM_data1     = 0x0b // constant
   208  	DW_FORM_flag      = 0x0c // flag
   209  	DW_FORM_sdata     = 0x0d // constant
   210  	DW_FORM_strp      = 0x0e // string
   211  	DW_FORM_udata     = 0x0f // constant
   212  	DW_FORM_ref_addr  = 0x10 // reference
   213  	DW_FORM_ref1      = 0x11 // reference
   214  	DW_FORM_ref2      = 0x12 // reference
   215  	DW_FORM_ref4      = 0x13 // reference
   216  	DW_FORM_ref8      = 0x14 // reference
   217  	DW_FORM_ref_udata = 0x15 // reference
   218  	DW_FORM_indirect  = 0x16 // (see Section 7.5.3)
   219  	// Dwarf4
   220  	DW_FORM_sec_offset   = 0x17 // lineptr, loclistptr, macptr, rangelistptr
   221  	DW_FORM_exprloc      = 0x18 // exprloc
   222  	DW_FORM_flag_present = 0x19 // flag
   223  	// Dwarf5
   224  	DW_FORM_addrx = 0x1b
   225  	// Pseudo-form: expanded to data4 on IOS, udata elsewhere.
   226  	DW_FORM_udata_pseudo = 0x99
   227  	// Pseudo-form: expands to DW_FORM_addrx in DWARF5, DW_FORM_addr in DWARF4
   228  	DW_FORM_lo_pc_pseudo = 0x9a
   229  	// Pseudo-form: expands to DW_FORM_udata in DWARF5, DW_FORM_addr in DWARF4
   230  	DW_FORM_hi_pc_pseudo = 0x9b
   231  )
   232  
   233  // Table 24 (#operands, notes)
   234  const (
   235  	DW_OP_addr                = 0x03 // 1 constant address (size target specific)
   236  	DW_OP_deref               = 0x06 // 0
   237  	DW_OP_const1u             = 0x08 // 1 1-byte constant
   238  	DW_OP_const1s             = 0x09 // 1 1-byte constant
   239  	DW_OP_const2u             = 0x0a // 1 2-byte constant
   240  	DW_OP_const2s             = 0x0b // 1 2-byte constant
   241  	DW_OP_const4u             = 0x0c // 1 4-byte constant
   242  	DW_OP_const4s             = 0x0d // 1 4-byte constant
   243  	DW_OP_const8u             = 0x0e // 1 8-byte constant
   244  	DW_OP_const8s             = 0x0f // 1 8-byte constant
   245  	DW_OP_constu              = 0x10 // 1 ULEB128 constant
   246  	DW_OP_consts              = 0x11 // 1 SLEB128 constant
   247  	DW_OP_dup                 = 0x12 // 0
   248  	DW_OP_drop                = 0x13 // 0
   249  	DW_OP_over                = 0x14 // 0
   250  	DW_OP_pick                = 0x15 // 1 1-byte stack index
   251  	DW_OP_swap                = 0x16 // 0
   252  	DW_OP_rot                 = 0x17 // 0
   253  	DW_OP_xderef              = 0x18 // 0
   254  	DW_OP_abs                 = 0x19 // 0
   255  	DW_OP_and                 = 0x1a // 0
   256  	DW_OP_div                 = 0x1b // 0
   257  	DW_OP_minus               = 0x1c // 0
   258  	DW_OP_mod                 = 0x1d // 0
   259  	DW_OP_mul                 = 0x1e // 0
   260  	DW_OP_neg                 = 0x1f // 0
   261  	DW_OP_not                 = 0x20 // 0
   262  	DW_OP_or                  = 0x21 // 0
   263  	DW_OP_plus                = 0x22 // 0
   264  	DW_OP_plus_uconst         = 0x23 // 1 ULEB128 addend
   265  	DW_OP_shl                 = 0x24 // 0
   266  	DW_OP_shr                 = 0x25 // 0
   267  	DW_OP_shra                = 0x26 // 0
   268  	DW_OP_xor                 = 0x27 // 0
   269  	DW_OP_skip                = 0x2f // 1 signed 2-byte constant
   270  	DW_OP_bra                 = 0x28 // 1 signed 2-byte constant
   271  	DW_OP_eq                  = 0x29 // 0
   272  	DW_OP_ge                  = 0x2a // 0
   273  	DW_OP_gt                  = 0x2b // 0
   274  	DW_OP_le                  = 0x2c // 0
   275  	DW_OP_lt                  = 0x2d // 0
   276  	DW_OP_ne                  = 0x2e // 0
   277  	DW_OP_lit0                = 0x30 // 0 ...
   278  	DW_OP_lit31               = 0x4f // 0 literals 0..31 = (DW_OP_lit0 + literal)
   279  	DW_OP_reg0                = 0x50 // 0 ..
   280  	DW_OP_reg31               = 0x6f // 0 reg 0..31 = (DW_OP_reg0 + regnum)
   281  	DW_OP_breg0               = 0x70 // 1 ...
   282  	DW_OP_breg31              = 0x8f // 1 SLEB128 offset base register 0..31 = (DW_OP_breg0 + regnum)
   283  	DW_OP_regx                = 0x90 // 1 ULEB128 register
   284  	DW_OP_fbreg               = 0x91 // 1 SLEB128 offset
   285  	DW_OP_bregx               = 0x92 // 2 ULEB128 register followed by SLEB128 offset
   286  	DW_OP_piece               = 0x93 // 1 ULEB128 size of piece addressed
   287  	DW_OP_deref_size          = 0x94 // 1 1-byte size of data retrieved
   288  	DW_OP_xderef_size         = 0x95 // 1 1-byte size of data retrieved
   289  	DW_OP_nop                 = 0x96 // 0
   290  	DW_OP_push_object_address = 0x97 // 0
   291  	DW_OP_call2               = 0x98 // 1 2-byte offset of DIE
   292  	DW_OP_call4               = 0x99 // 1 4-byte offset of DIE
   293  	DW_OP_call_ref            = 0x9a // 1 4- or 8-byte offset of DIE
   294  	DW_OP_form_tls_address    = 0x9b // 0
   295  	DW_OP_call_frame_cfa      = 0x9c // 0
   296  	DW_OP_bit_piece           = 0x9d // 2
   297  	DW_OP_lo_user             = 0xe0
   298  	DW_OP_hi_user             = 0xff
   299  )
   300  
   301  // Table 25
   302  const (
   303  	DW_ATE_address         = 0x01
   304  	DW_ATE_boolean         = 0x02
   305  	DW_ATE_complex_float   = 0x03
   306  	DW_ATE_float           = 0x04
   307  	DW_ATE_signed          = 0x05
   308  	DW_ATE_signed_char     = 0x06
   309  	DW_ATE_unsigned        = 0x07
   310  	DW_ATE_unsigned_char   = 0x08
   311  	DW_ATE_imaginary_float = 0x09
   312  	DW_ATE_packed_decimal  = 0x0a
   313  	DW_ATE_numeric_string  = 0x0b
   314  	DW_ATE_edited          = 0x0c
   315  	DW_ATE_signed_fixed    = 0x0d
   316  	DW_ATE_unsigned_fixed  = 0x0e
   317  	DW_ATE_decimal_float   = 0x0f
   318  	DW_ATE_lo_user         = 0x80
   319  	DW_ATE_hi_user         = 0xff
   320  )
   321  
   322  // Table 26
   323  const (
   324  	DW_DS_unsigned           = 0x01
   325  	DW_DS_leading_overpunch  = 0x02
   326  	DW_DS_trailing_overpunch = 0x03
   327  	DW_DS_leading_separate   = 0x04
   328  	DW_DS_trailing_separate  = 0x05
   329  )
   330  
   331  // Table 27
   332  const (
   333  	DW_END_default = 0x00
   334  	DW_END_big     = 0x01
   335  	DW_END_little  = 0x02
   336  	DW_END_lo_user = 0x40
   337  	DW_END_hi_user = 0xff
   338  )
   339  
   340  // Table 28
   341  const (
   342  	DW_ACCESS_public    = 0x01
   343  	DW_ACCESS_protected = 0x02
   344  	DW_ACCESS_private   = 0x03
   345  )
   346  
   347  // Table 29
   348  const (
   349  	DW_VIS_local     = 0x01
   350  	DW_VIS_exported  = 0x02
   351  	DW_VIS_qualified = 0x03
   352  )
   353  
   354  // Table 30
   355  const (
   356  	DW_VIRTUALITY_none         = 0x00
   357  	DW_VIRTUALITY_virtual      = 0x01
   358  	DW_VIRTUALITY_pure_virtual = 0x02
   359  )
   360  
   361  // Table 31
   362  const (
   363  	DW_LANG_C89         = 0x0001
   364  	DW_LANG_C           = 0x0002
   365  	DW_LANG_Ada83       = 0x0003
   366  	DW_LANG_C_plus_plus = 0x0004
   367  	DW_LANG_Cobol74     = 0x0005
   368  	DW_LANG_Cobol85     = 0x0006
   369  	DW_LANG_Fortran77   = 0x0007
   370  	DW_LANG_Fortran90   = 0x0008
   371  	DW_LANG_Pascal83    = 0x0009
   372  	DW_LANG_Modula2     = 0x000a
   373  	// Dwarf3
   374  	DW_LANG_Java           = 0x000b
   375  	DW_LANG_C99            = 0x000c
   376  	DW_LANG_Ada95          = 0x000d
   377  	DW_LANG_Fortran95      = 0x000e
   378  	DW_LANG_PLI            = 0x000f
   379  	DW_LANG_ObjC           = 0x0010
   380  	DW_LANG_ObjC_plus_plus = 0x0011
   381  	DW_LANG_UPC            = 0x0012
   382  	DW_LANG_D              = 0x0013
   383  	// Dwarf4
   384  	DW_LANG_Python = 0x0014
   385  	// Dwarf5
   386  	DW_LANG_Go = 0x0016
   387  
   388  	DW_LANG_lo_user = 0x8000
   389  	DW_LANG_hi_user = 0xffff
   390  )
   391  
   392  // Table 32
   393  const (
   394  	DW_ID_case_sensitive   = 0x00
   395  	DW_ID_up_case          = 0x01
   396  	DW_ID_down_case        = 0x02
   397  	DW_ID_case_insensitive = 0x03
   398  )
   399  
   400  // Table 33
   401  const (
   402  	DW_CC_normal  = 0x01
   403  	DW_CC_program = 0x02
   404  	DW_CC_nocall  = 0x03
   405  	DW_CC_lo_user = 0x40
   406  	DW_CC_hi_user = 0xff
   407  )
   408  
   409  // Table 34
   410  const (
   411  	DW_INL_not_inlined          = 0x00
   412  	DW_INL_inlined              = 0x01
   413  	DW_INL_declared_not_inlined = 0x02
   414  	DW_INL_declared_inlined     = 0x03
   415  )
   416  
   417  // Table 35
   418  const (
   419  	DW_ORD_row_major = 0x00
   420  	DW_ORD_col_major = 0x01
   421  )
   422  
   423  // Table 36
   424  const (
   425  	DW_DSC_label = 0x00
   426  	DW_DSC_range = 0x01
   427  )
   428  
   429  // Table 37
   430  const (
   431  	DW_LNS_copy             = 0x01
   432  	DW_LNS_advance_pc       = 0x02
   433  	DW_LNS_advance_line     = 0x03
   434  	DW_LNS_set_file         = 0x04
   435  	DW_LNS_set_column       = 0x05
   436  	DW_LNS_negate_stmt      = 0x06
   437  	DW_LNS_set_basic_block  = 0x07
   438  	DW_LNS_const_add_pc     = 0x08
   439  	DW_LNS_fixed_advance_pc = 0x09
   440  	// Dwarf3
   441  	DW_LNS_set_prologue_end   = 0x0a
   442  	DW_LNS_set_epilogue_begin = 0x0b
   443  	DW_LNS_set_isa            = 0x0c
   444  )
   445  
   446  // Table 38
   447  const (
   448  	DW_LNE_end_sequence = 0x01
   449  	DW_LNE_set_address  = 0x02
   450  	DW_LNE_define_file  = 0x03
   451  	DW_LNE_lo_user      = 0x80
   452  	DW_LNE_hi_user      = 0xff
   453  )
   454  
   455  // Table 7.25 (DWARF version 5), containing the encodings for the
   456  // .debug_rnglists entry formats.
   457  const (
   458  	DW_RLE_end_of_list   = 0x0
   459  	DW_RLE_base_addressx = 0x1
   460  	DW_RLE_startx_endx   = 0x2
   461  	DW_RLE_startx_length = 0x3
   462  	DW_RLE_offset_pair   = 0x4
   463  	DW_RLE_base_address  = 0x5
   464  	DW_RLE_start_end     = 0x6
   465  	DW_RLE_start_length  = 0x7
   466  )
   467  
   468  // Table 7.10 (DWARF version 5), containing the encodings for the
   469  // .debug_loclists entry formats.
   470  const (
   471  	DW_LLE_end_of_list      = 0x0
   472  	DW_LLE_base_addressx    = 0x1
   473  	DW_LLE_startx_endx      = 0x2
   474  	DW_LLE_startx_length    = 0x3
   475  	DW_LLE_offset_pair      = 0x4
   476  	DW_LLE_default_location = 0x5
   477  	DW_LLE_base_address     = 0x6
   478  	DW_LLE_start_end        = 0x7
   479  	DW_LLE_start_length     = 0x8
   480  )
   481  
   482  // Table 7.27 (DWARF version 5), containing the encodings for the
   483  // line number header entry formats.
   484  const (
   485  	DW_LNCT_path            = 0x01
   486  	DW_LNCT_directory_index = 0x02
   487  	DW_LNCT_timestamp       = 0x03
   488  	DW_LNCT_size            = 0x04
   489  	DW_LNCT_md5             = 0x05
   490  	DW_LNCT_lo_user         = 0x2000
   491  	DW_LNCT_hi_user         = 0x3fff
   492  )
   493  
   494  // Table 7.2 (DWARF version 5), dwarf unit type encodings.
   495  const (
   496  	DW_UT_compile       = 0x01
   497  	DW_UT_type          = 0x02
   498  	DW_UT_partial       = 0x03
   499  	DW_UT_skeleton      = 0x04
   500  	DW_UT_split_compile = 0x05
   501  	DW_UT_split_type    = 0x06
   502  	DW_UT_lo_user       = 0x80
   503  	DW_UT_hi_user       = 0xff
   504  )
   505  
   506  // Table 39
   507  const (
   508  	DW_MACINFO_define     = 0x01
   509  	DW_MACINFO_undef      = 0x02
   510  	DW_MACINFO_start_file = 0x03
   511  	DW_MACINFO_end_file   = 0x04
   512  	DW_MACINFO_vendor_ext = 0xff
   513  )
   514  
   515  // Table 40.
   516  const (
   517  	// operand,...
   518  	DW_CFA_nop              = 0x00
   519  	DW_CFA_set_loc          = 0x01 // address
   520  	DW_CFA_advance_loc1     = 0x02 // 1-byte delta
   521  	DW_CFA_advance_loc2     = 0x03 // 2-byte delta
   522  	DW_CFA_advance_loc4     = 0x04 // 4-byte delta
   523  	DW_CFA_offset_extended  = 0x05 // ULEB128 register, ULEB128 offset
   524  	DW_CFA_restore_extended = 0x06 // ULEB128 register
   525  	DW_CFA_undefined        = 0x07 // ULEB128 register
   526  	DW_CFA_same_value       = 0x08 // ULEB128 register
   527  	DW_CFA_register         = 0x09 // ULEB128 register, ULEB128 register
   528  	DW_CFA_remember_state   = 0x0a
   529  	DW_CFA_restore_state    = 0x0b
   530  
   531  	DW_CFA_def_cfa            = 0x0c // ULEB128 register, ULEB128 offset
   532  	DW_CFA_def_cfa_register   = 0x0d // ULEB128 register
   533  	DW_CFA_def_cfa_offset     = 0x0e // ULEB128 offset
   534  	DW_CFA_def_cfa_expression = 0x0f // BLOCK
   535  	DW_CFA_expression         = 0x10 // ULEB128 register, BLOCK
   536  	DW_CFA_offset_extended_sf = 0x11 // ULEB128 register, SLEB128 offset
   537  	DW_CFA_def_cfa_sf         = 0x12 // ULEB128 register, SLEB128 offset
   538  	DW_CFA_def_cfa_offset_sf  = 0x13 // SLEB128 offset
   539  	DW_CFA_val_offset         = 0x14 // ULEB128, ULEB128
   540  	DW_CFA_val_offset_sf      = 0x15 // ULEB128, SLEB128
   541  	DW_CFA_val_expression     = 0x16 // ULEB128, BLOCK
   542  
   543  	DW_CFA_lo_user = 0x1c
   544  	DW_CFA_hi_user = 0x3f
   545  
   546  	// Opcodes that take an addend operand.
   547  	DW_CFA_advance_loc = 0x1 << 6 // +delta
   548  	DW_CFA_offset      = 0x2 << 6 // +register (ULEB128 offset)
   549  	DW_CFA_restore     = 0x3 << 6 // +register
   550  )
   551
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