Documentation
¶
Overview ¶
Package dwarf generates DWARF debugging information. DWARF generation is split between the compiler and the linker, this package contains the shared code.
Index ¶
- Constants
- func AppendSleb128(b []byte, v int64) []byte
- func AppendUleb128(b []byte, v uint64) []byte
- func GetAbbrev() []byte
- func HasChildren(die *DWDie) bool
- func PutAttrs(ctxt Context, s Sym, abbrev int, attr *DWAttr)
- func PutFunc(ctxt Context, s Sym, name string, external bool, startPC Sym, size int64, ...)
- func Sleb128put(ctxt Context, s Sym, v int64)
- func Uleb128put(ctxt Context, s Sym, v int64)
- type Context
- type DWAttr
- type DWDie
- type Sym
- type Var
Constants ¶
View Source
const ( DW_AT_go_kind = 0x2900 DW_AT_go_key = 0x2901 DW_AT_go_elem = 0x2902 DW_AT_internal_location = 253 // params and locals; not emitted )
Go-specific type attributes.
View Source
const ( DW_ABRV_NULL = iota DW_ABRV_COMPUNIT DW_ABRV_FUNCTION DW_ABRV_VARIABLE DW_ABRV_AUTO DW_ABRV_PARAM DW_ABRV_STRUCTFIELD DW_ABRV_FUNCTYPEPARAM DW_ABRV_DOTDOTDOT DW_ABRV_ARRAYRANGE DW_ABRV_NULLTYPE DW_ABRV_BASETYPE DW_ABRV_ARRAYTYPE DW_ABRV_CHANTYPE DW_ABRV_FUNCTYPE DW_ABRV_IFACETYPE DW_ABRV_MAPTYPE DW_ABRV_PTRTYPE DW_ABRV_BARE_PTRTYPE // only for void*, no DW_AT_type attr to please gdb 6. DW_ABRV_SLICETYPE DW_ABRV_STRINGTYPE DW_ABRV_STRUCTTYPE DW_ABRV_TYPEDECL DW_NABRV )
Index into the abbrevs table below. Keep in sync with ispubname() and ispubtype() below. ispubtype considers >= NULLTYPE public
View Source
const ( DW_TAG_array_type = 0x01 DW_TAG_class_type = 0x02 DW_TAG_entry_point = 0x03 DW_TAG_enumeration_type = 0x04 DW_TAG_formal_parameter = 0x05 DW_TAG_imported_declaration = 0x08 DW_TAG_label = 0x0a DW_TAG_lexical_block = 0x0b DW_TAG_member = 0x0d DW_TAG_pointer_type = 0x0f DW_TAG_reference_type = 0x10 DW_TAG_compile_unit = 0x11 DW_TAG_string_type = 0x12 DW_TAG_structure_type = 0x13 DW_TAG_subroutine_type = 0x15 DW_TAG_typedef = 0x16 DW_TAG_union_type = 0x17 DW_TAG_unspecified_parameters = 0x18 DW_TAG_variant = 0x19 DW_TAG_common_block = 0x1a DW_TAG_common_inclusion = 0x1b DW_TAG_inheritance = 0x1c DW_TAG_inlined_subroutine = 0x1d DW_TAG_module = 0x1e DW_TAG_ptr_to_member_type = 0x1f DW_TAG_set_type = 0x20 DW_TAG_subrange_type = 0x21 DW_TAG_with_stmt = 0x22 DW_TAG_access_declaration = 0x23 DW_TAG_base_type = 0x24 DW_TAG_catch_block = 0x25 DW_TAG_const_type = 0x26 DW_TAG_constant = 0x27 DW_TAG_enumerator = 0x28 DW_TAG_file_type = 0x29 DW_TAG_friend = 0x2a DW_TAG_namelist = 0x2b DW_TAG_namelist_item = 0x2c DW_TAG_packed_type = 0x2d DW_TAG_subprogram = 0x2e DW_TAG_template_type_parameter = 0x2f DW_TAG_template_value_parameter = 0x30 DW_TAG_thrown_type = 0x31 DW_TAG_try_block = 0x32 DW_TAG_variant_part = 0x33 DW_TAG_variable = 0x34 DW_TAG_volatile_type = 0x35 // Dwarf3 DW_TAG_dwarf_procedure = 0x36 DW_TAG_restrict_type = 0x37 DW_TAG_interface_type = 0x38 DW_TAG_namespace = 0x39 DW_TAG_imported_module = 0x3a DW_TAG_unspecified_type = 0x3b DW_TAG_partial_unit = 0x3c DW_TAG_imported_unit = 0x3d DW_TAG_condition = 0x3f // Dwarf4 DW_TAG_type_unit = 0x41 DW_TAG_rvalue_reference_type = 0x42 DW_TAG_template_alias = 0x43 // User defined DW_TAG_lo_user = 0x4080 DW_TAG_hi_user = 0xffff )
Table 18
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const ( DW_CHILDREN_no = 0x00 DW_CHILDREN_yes = 0x01 )
Table 19
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const ( DW_CLS_ADDRESS = 0x01 + iota DW_CLS_BLOCK DW_CLS_CONSTANT DW_CLS_FLAG DW_CLS_PTR // lineptr, loclistptr, macptr, rangelistptr DW_CLS_REFERENCE DW_CLS_ADDRLOC DW_CLS_STRING )
Not from the spec, but logically belongs here
View Source
const ( DW_AT_sibling = 0x01 // reference DW_AT_location = 0x02 // block, loclistptr DW_AT_name = 0x03 // string DW_AT_ordering = 0x09 // constant DW_AT_byte_size = 0x0b // block, constant, reference DW_AT_bit_offset = 0x0c // block, constant, reference DW_AT_bit_size = 0x0d // block, constant, reference DW_AT_stmt_list = 0x10 // lineptr DW_AT_low_pc = 0x11 // address DW_AT_high_pc = 0x12 // address DW_AT_language = 0x13 // constant DW_AT_discr = 0x15 // reference DW_AT_discr_value = 0x16 // constant DW_AT_visibility = 0x17 // constant DW_AT_import = 0x18 // reference DW_AT_string_length = 0x19 // block, loclistptr DW_AT_common_reference = 0x1a // reference DW_AT_comp_dir = 0x1b // string DW_AT_const_value = 0x1c // block, constant, string DW_AT_containing_type = 0x1d // reference DW_AT_default_value = 0x1e // reference DW_AT_inline = 0x20 // constant DW_AT_is_optional = 0x21 // flag DW_AT_lower_bound = 0x22 // block, constant, reference DW_AT_producer = 0x25 // string DW_AT_prototyped = 0x27 // flag DW_AT_return_addr = 0x2a // block, loclistptr DW_AT_start_scope = 0x2c // constant DW_AT_bit_stride = 0x2e // constant DW_AT_upper_bound = 0x2f // block, constant, reference DW_AT_abstract_origin = 0x31 // reference DW_AT_accessibility = 0x32 // constant DW_AT_address_class = 0x33 // constant DW_AT_artificial = 0x34 // flag DW_AT_base_types = 0x35 // reference DW_AT_calling_convention = 0x36 // constant DW_AT_count = 0x37 // block, constant, reference DW_AT_data_member_location = 0x38 // block, constant, loclistptr DW_AT_decl_column = 0x39 // constant DW_AT_decl_file = 0x3a // constant DW_AT_decl_line = 0x3b // constant DW_AT_declaration = 0x3c // flag DW_AT_discr_list = 0x3d // block DW_AT_encoding = 0x3e // constant DW_AT_external = 0x3f // flag DW_AT_frame_base = 0x40 // block, loclistptr DW_AT_friend = 0x41 // reference DW_AT_identifier_case = 0x42 // constant DW_AT_macro_info = 0x43 // macptr DW_AT_namelist_item = 0x44 // block DW_AT_priority = 0x45 // reference DW_AT_segment = 0x46 // block, loclistptr DW_AT_specification = 0x47 // reference DW_AT_static_link = 0x48 // block, loclistptr DW_AT_type = 0x49 // reference DW_AT_use_location = 0x4a // block, loclistptr DW_AT_variable_parameter = 0x4b // flag DW_AT_virtuality = 0x4c // constant DW_AT_vtable_elem_location = 0x4d // block, loclistptr // Dwarf3 DW_AT_allocated = 0x4e // block, constant, reference DW_AT_associated = 0x4f // block, constant, reference DW_AT_data_location = 0x50 // block DW_AT_byte_stride = 0x51 // block, constant, reference DW_AT_entry_pc = 0x52 // address DW_AT_use_UTF8 = 0x53 // flag DW_AT_extension = 0x54 // reference DW_AT_ranges = 0x55 // rangelistptr DW_AT_trampoline = 0x56 // address, flag, reference, string DW_AT_call_column = 0x57 // constant DW_AT_call_file = 0x58 // constant DW_AT_call_line = 0x59 // constant DW_AT_description = 0x5a // string DW_AT_binary_scale = 0x5b // constant DW_AT_decimal_scale = 0x5c // constant DW_AT_small = 0x5d // reference DW_AT_decimal_sign = 0x5e // constant DW_AT_digit_count = 0x5f // constant DW_AT_picture_string = 0x60 // string DW_AT_mutable = 0x61 // flag DW_AT_threads_scaled = 0x62 // flag DW_AT_explicit = 0x63 // flag DW_AT_object_pointer = 0x64 // reference DW_AT_endianity = 0x65 // constant DW_AT_elemental = 0x66 // flag DW_AT_pure = 0x67 // flag DW_AT_recursive = 0x68 // flag DW_AT_lo_user = 0x2000 // --- DW_AT_hi_user = 0x3fff // --- )
Table 20
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const ( DW_FORM_addr = 0x01 // address DW_FORM_block2 = 0x03 // block DW_FORM_block4 = 0x04 // block DW_FORM_data2 = 0x05 // constant DW_FORM_data4 = 0x06 // constant, lineptr, loclistptr, macptr, rangelistptr DW_FORM_data8 = 0x07 // constant, lineptr, loclistptr, macptr, rangelistptr DW_FORM_string = 0x08 // string DW_FORM_block = 0x09 // block DW_FORM_block1 = 0x0a // block DW_FORM_data1 = 0x0b // constant DW_FORM_flag = 0x0c // flag DW_FORM_sdata = 0x0d // constant DW_FORM_strp = 0x0e // string DW_FORM_udata = 0x0f // constant DW_FORM_ref_addr = 0x10 // reference DW_FORM_ref1 = 0x11 // reference DW_FORM_ref2 = 0x12 // reference DW_FORM_ref4 = 0x13 // reference DW_FORM_ref8 = 0x14 // reference DW_FORM_ref_udata = 0x15 // reference DW_FORM_indirect = 0x16 // (see Section 7.5.3) )
Table 21
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const ( DW_OP_addr = 0x03 // 1 constant address (size target specific) DW_OP_deref = 0x06 // 0 DW_OP_const1u = 0x08 // 1 1-byte constant DW_OP_const1s = 0x09 // 1 1-byte constant DW_OP_const2u = 0x0a // 1 2-byte constant DW_OP_const2s = 0x0b // 1 2-byte constant DW_OP_const4u = 0x0c // 1 4-byte constant DW_OP_const4s = 0x0d // 1 4-byte constant DW_OP_const8u = 0x0e // 1 8-byte constant DW_OP_const8s = 0x0f // 1 8-byte constant DW_OP_constu = 0x10 // 1 ULEB128 constant DW_OP_consts = 0x11 // 1 SLEB128 constant DW_OP_dup = 0x12 // 0 DW_OP_drop = 0x13 // 0 DW_OP_over = 0x14 // 0 DW_OP_pick = 0x15 // 1 1-byte stack index DW_OP_swap = 0x16 // 0 DW_OP_rot = 0x17 // 0 DW_OP_xderef = 0x18 // 0 DW_OP_abs = 0x19 // 0 DW_OP_and = 0x1a // 0 DW_OP_div = 0x1b // 0 DW_OP_minus = 0x1c // 0 DW_OP_mod = 0x1d // 0 DW_OP_mul = 0x1e // 0 DW_OP_neg = 0x1f // 0 DW_OP_not = 0x20 // 0 DW_OP_or = 0x21 // 0 DW_OP_plus = 0x22 // 0 DW_OP_plus_uconst = 0x23 // 1 ULEB128 addend DW_OP_shl = 0x24 // 0 DW_OP_shr = 0x25 // 0 DW_OP_shra = 0x26 // 0 DW_OP_xor = 0x27 // 0 DW_OP_skip = 0x2f // 1 signed 2-byte constant DW_OP_bra = 0x28 // 1 signed 2-byte constant DW_OP_eq = 0x29 // 0 DW_OP_ge = 0x2a // 0 DW_OP_gt = 0x2b // 0 DW_OP_le = 0x2c // 0 DW_OP_lt = 0x2d // 0 DW_OP_ne = 0x2e // 0 DW_OP_lit0 = 0x30 // 0 ... DW_OP_lit31 = 0x4f // 0 literals 0..31 = (DW_OP_lit0 + literal) DW_OP_reg0 = 0x50 // 0 .. DW_OP_reg31 = 0x6f // 0 reg 0..31 = (DW_OP_reg0 + regnum) DW_OP_breg0 = 0x70 // 1 ... DW_OP_breg31 = 0x8f // 1 SLEB128 offset base register 0..31 = (DW_OP_breg0 + regnum) DW_OP_regx = 0x90 // 1 ULEB128 register DW_OP_fbreg = 0x91 // 1 SLEB128 offset DW_OP_bregx = 0x92 // 2 ULEB128 register followed by SLEB128 offset DW_OP_piece = 0x93 // 1 ULEB128 size of piece addressed DW_OP_deref_size = 0x94 // 1 1-byte size of data retrieved DW_OP_xderef_size = 0x95 // 1 1-byte size of data retrieved DW_OP_nop = 0x96 // 0 DW_OP_push_object_address = 0x97 // 0 DW_OP_call2 = 0x98 // 1 2-byte offset of DIE DW_OP_call4 = 0x99 // 1 4-byte offset of DIE DW_OP_call_ref = 0x9a // 1 4- or 8-byte offset of DIE DW_OP_form_tls_address = 0x9b // 0 DW_OP_call_frame_cfa = 0x9c // 0 DW_OP_bit_piece = 0x9d // 2 DW_OP_lo_user = 0xe0 DW_OP_hi_user = 0xff )
Table 24 (#operands, notes)
View Source
const ( DW_ATE_address = 0x01 DW_ATE_boolean = 0x02 DW_ATE_complex_float = 0x03 DW_ATE_float = 0x04 DW_ATE_signed = 0x05 DW_ATE_signed_char = 0x06 DW_ATE_unsigned = 0x07 DW_ATE_unsigned_char = 0x08 DW_ATE_imaginary_float = 0x09 DW_ATE_packed_decimal = 0x0a DW_ATE_numeric_string = 0x0b DW_ATE_edited = 0x0c DW_ATE_signed_fixed = 0x0d DW_ATE_unsigned_fixed = 0x0e DW_ATE_decimal_float = 0x0f DW_ATE_lo_user = 0x80 DW_ATE_hi_user = 0xff )
Table 25
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const ( DW_DS_unsigned = 0x01 DW_DS_leading_overpunch = 0x02 DW_DS_trailing_overpunch = 0x03 DW_DS_leading_separate = 0x04 DW_DS_trailing_separate = 0x05 )
Table 26
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const ( DW_END_default = 0x00 DW_END_big = 0x01 DW_END_little = 0x02 DW_END_lo_user = 0x40 DW_END_hi_user = 0xff )
Table 27
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const ( DW_ACCESS_public = 0x01 DW_ACCESS_protected = 0x02 DW_ACCESS_private = 0x03 )
Table 28
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const ( DW_VIS_local = 0x01 DW_VIS_exported = 0x02 DW_VIS_qualified = 0x03 )
Table 29
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const ( DW_VIRTUALITY_none = 0x00 DW_VIRTUALITY_virtual = 0x01 DW_VIRTUALITY_pure_virtual = 0x02 )
Table 30
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const ( DW_LANG_C89 = 0x0001 DW_LANG_C = 0x0002 DW_LANG_Ada83 = 0x0003 DW_LANG_C_plus_plus = 0x0004 DW_LANG_Cobol74 = 0x0005 DW_LANG_Cobol85 = 0x0006 DW_LANG_Fortran77 = 0x0007 DW_LANG_Fortran90 = 0x0008 DW_LANG_Pascal83 = 0x0009 DW_LANG_Modula2 = 0x000a // Dwarf3 DW_LANG_Java = 0x000b DW_LANG_C99 = 0x000c DW_LANG_Ada95 = 0x000d DW_LANG_Fortran95 = 0x000e DW_LANG_PLI = 0x000f DW_LANG_ObjC = 0x0010 DW_LANG_ObjC_plus_plus = 0x0011 DW_LANG_UPC = 0x0012 DW_LANG_D = 0x0013 // Dwarf4 DW_LANG_Python = 0x0014 // Dwarf5 DW_LANG_Go = 0x0016 DW_LANG_lo_user = 0x8000 DW_LANG_hi_user = 0xffff )
Table 31
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const ( DW_ID_case_sensitive = 0x00 DW_ID_up_case = 0x01 DW_ID_down_case = 0x02 DW_ID_case_insensitive = 0x03 )
Table 32
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const ( DW_CC_normal = 0x01 DW_CC_program = 0x02 DW_CC_nocall = 0x03 DW_CC_lo_user = 0x40 DW_CC_hi_user = 0xff )
Table 33
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const ( DW_INL_not_inlined = 0x00 DW_INL_inlined = 0x01 DW_INL_declared_not_inlined = 0x02 DW_INL_declared_inlined = 0x03 )
Table 34
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const ( DW_ORD_row_major = 0x00 DW_ORD_col_major = 0x01 )
Table 35
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const ( DW_DSC_label = 0x00 DW_DSC_range = 0x01 )
Table 36
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const ( DW_LNS_copy = 0x01 DW_LNS_advance_pc = 0x02 DW_LNS_advance_line = 0x03 DW_LNS_set_file = 0x04 DW_LNS_set_column = 0x05 DW_LNS_negate_stmt = 0x06 DW_LNS_set_basic_block = 0x07 DW_LNS_const_add_pc = 0x08 DW_LNS_fixed_advance_pc = 0x09 // Dwarf3 DW_LNS_set_prologue_end = 0x0a DW_LNS_set_epilogue_begin = 0x0b DW_LNS_set_isa = 0x0c )
Table 37
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const ( DW_LNE_end_sequence = 0x01 DW_LNE_set_address = 0x02 DW_LNE_define_file = 0x03 DW_LNE_lo_user = 0x80 DW_LNE_hi_user = 0xff )
Table 38
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const ( DW_MACINFO_define = 0x01 DW_MACINFO_undef = 0x02 DW_MACINFO_start_file = 0x03 DW_MACINFO_end_file = 0x04 DW_MACINFO_vendor_ext = 0xff )
Table 39
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const ( // operand,... DW_CFA_nop = 0x00 DW_CFA_set_loc = 0x01 // address DW_CFA_advance_loc1 = 0x02 // 1-byte delta DW_CFA_advance_loc2 = 0x03 // 2-byte delta DW_CFA_advance_loc4 = 0x04 // 4-byte delta DW_CFA_offset_extended = 0x05 // ULEB128 register, ULEB128 offset DW_CFA_restore_extended = 0x06 // ULEB128 register DW_CFA_undefined = 0x07 // ULEB128 register DW_CFA_same_value = 0x08 // ULEB128 register DW_CFA_register = 0x09 // ULEB128 register, ULEB128 register DW_CFA_remember_state = 0x0a DW_CFA_restore_state = 0x0b DW_CFA_def_cfa = 0x0c // ULEB128 register, ULEB128 offset DW_CFA_def_cfa_register = 0x0d // ULEB128 register DW_CFA_def_cfa_offset = 0x0e // ULEB128 offset DW_CFA_def_cfa_expression = 0x0f // BLOCK DW_CFA_expression = 0x10 // ULEB128 register, BLOCK DW_CFA_offset_extended_sf = 0x11 // ULEB128 register, SLEB128 offset DW_CFA_def_cfa_sf = 0x12 // ULEB128 register, SLEB128 offset DW_CFA_def_cfa_offset_sf = 0x13 // SLEB128 offset DW_CFA_val_offset = 0x14 // ULEB128, ULEB128 DW_CFA_val_offset_sf = 0x15 // ULEB128, SLEB128 DW_CFA_val_expression = 0x16 // ULEB128, BLOCK DW_CFA_lo_user = 0x1c DW_CFA_hi_user = 0x3f // Opcodes that take an addend operand. DW_CFA_advance_loc = 0x1 << 6 // +delta DW_CFA_offset = 0x2 << 6 // +register (ULEB128 offset) DW_CFA_restore = 0x3 << 6 // +register )
Table 40.
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const InfoPrefix = "go.info."
InfoPrefix is the prefix for all the symbols containing DWARF info entries.
Variables ¶
This section is empty.
Functions ¶
func AppendSleb128 ¶
AppendSleb128 appends v to b using DWARF's signed LEB128 encoding.
func AppendUleb128 ¶
AppendUleb128 appends v to b using DWARF's unsigned LEB128 encoding.
func GetAbbrev ¶
func GetAbbrev() []byte
GetAbbrev returns the contents of the .debug_abbrev section.
func HasChildren ¶
HasChildren returns true if 'die' uses an abbrev that supports children.
func PutAttrs ¶
PutAttrs writes the attributes for a DIE to symbol 's'.
Note that we can (and do) add arbitrary attributes to a DIE, but only the ones actually listed in the Abbrev will be written out.
func PutFunc ¶
PutFunc writes a DIE for a function to s. It also writes child DIEs for each variable in vars.
func Sleb128put ¶
AppendUleb128 appends v to s using DWARF's signed LEB128 encoding.
func Uleb128put ¶
AppendUleb128 appends v to s using DWARF's unsigned LEB128 encoding.
Types ¶
type Context ¶
type Context interface {
PtrSize() int
AddInt(s Sym, size int, i int64)
AddBytes(s Sym, b []byte)
AddAddress(s Sym, t interface{}, ofs int64)
AddSectionOffset(s Sym, size int, t interface{}, ofs int64)
AddString(s Sym, v string)
SymValue(s Sym) int64
}
A Context specifies how to add data to a Sym.
type DWAttr ¶
type DWAttr struct {
Link *DWAttr
Atr uint16 // DW_AT_
Cls uint8 // DW_CLS_
Value int64
Data interface{}
}
DWAttr represents an attribute of a DWDie.
For DW_CLS_string and _block, value should contain the length, and data the data, for _reference, value is 0 and data is a DWDie* to the referenced instance, for all others, value is the whole thing and data is null.
Source Files
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