dwarf

package
Version: v0.0.0-...-984e81f Latest Latest
Warning

This package is not in the latest version of its module.

Go to latest
Published: Jan 20, 2018 License: BSD-3-Clause Imports: 4 Imported by: 0

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

View Source
const (
	DW_AT_go_kind = 0x2900
	DW_AT_go_key  = 0x2901
	DW_AT_go_elem = 0x2902
	// Attribute for DW_TAG_member of a struct type.
	// Nonzero value indicates the struct field is an embedded field.
	DW_AT_go_embedded_field = 0x2903

	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_FUNCTION_ABSTRACT
	DW_ABRV_FUNCTION_CONCRETE
	DW_ABRV_INLINED_SUBROUTINE
	DW_ABRV_INLINED_SUBROUTINE_RANGES
	DW_ABRV_VARIABLE
	DW_ABRV_INT_CONSTANT
	DW_ABRV_AUTO
	DW_ABRV_AUTO_LOCLIST
	DW_ABRV_AUTO_ABSTRACT
	DW_ABRV_AUTO_CONCRETE
	DW_ABRV_AUTO_CONCRETE_LOCLIST
	DW_ABRV_PARAM
	DW_ABRV_PARAM_LOCLIST
	DW_ABRV_PARAM_ABSTRACT
	DW_ABRV_PARAM_CONCRETE
	DW_ABRV_PARAM_CONCRETE_LOCLIST
	DW_ABRV_LEXICAL_BLOCK_RANGES
	DW_ABRV_LEXICAL_BLOCK_SIMPLE
	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() in ld/dwarf.go. 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
	DW_TAG_shared_type      = 0x40
	// 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

View Source
const (
	DW_CHILDREN_no  = 0x00
	DW_CHILDREN_yes = 0x01
)

Table 19

View Source
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

View Source
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)
	// Dwarf4
	DW_FORM_sec_offset   = 0x17 // lineptr, loclistptr, macptr, rangelistptr
	DW_FORM_exprloc      = 0x18 // exprloc
	DW_FORM_flag_present = 0x19 // flag
	DW_FORM_ref_sig8     = 0x20 // reference
)

Table 21

View Source
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

View Source
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

View Source
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

View Source
const (
	DW_ACCESS_public    = 0x01
	DW_ACCESS_protected = 0x02
	DW_ACCESS_private   = 0x03
)

Table 28

View Source
const (
	DW_VIS_local     = 0x01
	DW_VIS_exported  = 0x02
	DW_VIS_qualified = 0x03
)

Table 29

View Source
const (
	DW_VIRTUALITY_none         = 0x00
	DW_VIRTUALITY_virtual      = 0x01
	DW_VIRTUALITY_pure_virtual = 0x02
)

Table 30

View Source
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

View Source
const (
	DW_ID_case_sensitive   = 0x00
	DW_ID_up_case          = 0x01
	DW_ID_down_case        = 0x02
	DW_ID_case_insensitive = 0x03
)

Table 32

View Source
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

View Source
const (
	DW_INL_not_inlined          = 0x00
	DW_INL_inlined              = 0x01
	DW_INL_declared_not_inlined = 0x02
	DW_INL_declared_inlined     = 0x03
)

Table 34

View Source
const (
	DW_ORD_row_major = 0x00
	DW_ORD_col_major = 0x01
)

Table 35

View Source
const (
	DW_DSC_label = 0x00
	DW_DSC_range = 0x01
)

Table 36

View Source
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

View Source
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

View Source
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

View Source
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.

View Source
const AbstractFuncSuffix = "$abstract"

Used to form the symbol name assigned to the DWARF 'abstract subprogram" info entry for a function

View Source
const CUInfoPrefix = "go.cuinfo."

CUInfoPrefix is the prefix for symbols containing information to populate the DWARF compilation unit info entries.

View Source
const ConstInfoPrefix = "go.constinfo."

ConstInfoPrefix is the prefix for all symbols containing DWARF info entries that contain constants.

View Source
const InfoPrefix = "go.info."

InfoPrefix is the prefix for all the symbols containing DWARF info entries.

View Source
const LocPrefix = "go.loc."

RangePrefix is the prefix for all the symbols containing DWARF location lists.

View Source
const RangePrefix = "go.range."

RangePrefix is the prefix for all the symbols containing DWARF range lists.

Variables

This section is empty.

Functions

func AppendSleb128

func AppendSleb128(b []byte, v int64) []byte

AppendSleb128 appends v to b using DWARF's signed LEB128 encoding.

func AppendUleb128

func AppendUleb128(b []byte, v uint64) []byte

AppendUleb128 appends v to b using DWARF's unsigned LEB128 encoding.

func EnableLogging

func EnableLogging(doit bool)

func GetAbbrev

func GetAbbrev() []byte

GetAbbrev returns the contents of the .debug_abbrev section.

func HasChildren

func HasChildren(die *DWDie) bool

HasChildren returns true if 'die' uses an abbrev that supports children.

func PutAbstractFunc

func PutAbstractFunc(ctxt Context, s *FnState) error

Emit DWARF attributes and child DIEs for an 'abstract' subprogram. The abstract subprogram DIE for a function contains its location-independent attributes (name, type, etc). Other instances of the function (any inlined copy of it, or the single out-of-line 'concrete' instance) will contain a pointer back to this abstract DIE (as a space-saving measure, so that name/type etc doesn't have to be repeated for each inlined copy).

func PutAttrs

func PutAttrs(ctxt Context, s Sym, abbrev int, attr *DWAttr)

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 PutConcreteFunc

func PutConcreteFunc(ctxt Context, s *FnState) error

Emit DWARF attributes and child DIEs for a 'concrete' subprogram, meaning the out-of-line copy of a function that was inlined at some point during the compilation of its containing package. The first attribute for a concrete DIE is a reference to the 'abstract' DIE for the function (which holds location-independent attributes such as name, type), then the remainder of the attributes are specific to this instance (location, frame base, etc).

func PutDefaultFunc

func PutDefaultFunc(ctxt Context, s *FnState) error

Emit DWARF attributes and child DIEs for a subprogram. Here 'default' implies that the function in question was not inlined when its containing package was compiled (hence there is no need to emit an abstract version for it to use as a base for inlined routine records).

func PutInlinedFunc

func PutInlinedFunc(ctxt Context, s *FnState, callersym Sym, callIdx int) error

Emit DWARF attributes and child DIEs for an inlined subroutine. The first attribute of an inlined subroutine DIE is a reference back to its corresponding 'abstract' DIE (containing location-independent attributes such as name, type, etc). Inlined subroutine DIEs can have other inlined subroutine DIEs as children.

func PutIntConst

func PutIntConst(ctxt Context, info, typ Sym, name string, val int64)

PutIntConst writes a DIE for an integer constant

func PutRanges

func PutRanges(ctxt Context, sym Sym, base Sym, ranges []Range)

PutRanges writes a range table to sym. All addresses in ranges are relative to some base address. If base is not nil, then they're relative to the start of base. If base is nil, then the caller must arrange a base address some other way (such as a DW_AT_low_pc attribute).

func Sleb128put

func Sleb128put(ctxt Context, s Sym, v int64)

Sleb128put appends v to s using DWARF's signed LEB128 encoding.

func Uleb128put

func Uleb128put(ctxt Context, s Sym, v int64)

Uleb128put 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)
	AddCURelativeAddress(s Sym, t interface{}, ofs int64)
	AddSectionOffset(s Sym, size int, t interface{}, ofs int64)
	CurrentOffset(s Sym) int64
	RecordDclReference(from Sym, to Sym, dclIdx int, inlIndex int)
	RecordChildDieOffsets(s Sym, vars []*Var, offsets []int32)
	AddString(s Sym, v string)
	AddFileRef(s Sym, f interface{})
	Logf(format string, args ...interface{})
}

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.

type DWDie

type DWDie struct {
	Abbrev int
	Link   *DWDie
	Child  *DWDie
	Attr   *DWAttr
	Sym    Sym
}

DWDie represents a DWARF debug info entry.

type FnState

type FnState struct {
	Name       string
	Importpath string
	Info       Sym
	Filesym    Sym
	Loc        Sym
	Ranges     Sym
	Absfn      Sym
	StartPC    Sym
	Size       int64
	External   bool
	Scopes     []Scope
	InlCalls   InlCalls
}

This container is used by the PutFunc* variants below when creating the DWARF subprogram DIE(s) for a function.

type InlCall

type InlCall struct {
	// index into ctx.InlTree describing the call inlined here
	InlIndex int

	// Symbol of file containing inlined call site (really *obj.LSym).
	CallFile Sym

	// Line number of inlined call site.
	CallLine uint32

	// Dwarf abstract subroutine symbol (really *obj.LSym).
	AbsFunSym Sym

	// Indices of child inlines within Calls array above.
	Children []int

	// entries in this list are PAUTO's created by the inliner to
	// capture the promoted formals and locals of the inlined callee.
	InlVars []*Var

	// PC ranges for this inlined call.
	Ranges []Range

	// Root call (not a child of some other call).
	Root bool
}

type InlCalls

type InlCalls struct {
	Calls []InlCall
}

type Location

type Location struct {
	StartPC, EndPC int64
	Pieces         []Piece
}

A Location represents a variable's location at a particular PC range. It becomes a location list entry in the DWARF.

type Piece

type Piece struct {
	Length      int64
	StackOffset int32
	RegNum      int16
	Missing     bool
	OnStack     bool // if true, RegNum is unset.
}

A Piece represents the location of a particular part of a variable. It becomes part of a location list entry (a DW_OP_piece) in the DWARF.

type Range

type Range struct {
	Start, End int64
}

A Range represents a half-open interval [Start, End).

type Scope

type Scope struct {
	Parent int32
	Ranges []Range
	Vars   []*Var
}

A Scope represents a lexical scope. All variables declared within a scope will only be visible to instructions covered by the scope. Lexical scopes are contiguous in source files but can end up being compiled to discontiguous blocks of instructions in the executable. The Ranges field lists all the blocks of instructions that belong in this scope.

func (*Scope) UnifyRanges

func (s *Scope) UnifyRanges(c *Scope)

UnifyRanges merges the list of ranges of c into the list of ranges of s

type Sym

type Sym interface {
	Len() int64
}

Sym represents a symbol.

type Var

type Var struct {
	Name          string
	Abbrev        int // Either DW_ABRV_AUTO[_LOCLIST] or DW_ABRV_PARAM[_LOCLIST]
	IsReturnValue bool
	IsInlFormal   bool
	StackOffset   int32
	LocationList  []Location
	Scope         int32
	Type          Sym
	DeclFile      string
	DeclLine      uint
	DeclCol       uint
	InlIndex      int32 // subtract 1 to form real index into InlTree
	ChildIndex    int32 // child DIE index in abstract function
	IsInAbstract  bool  // variable exists in abstract function
}

A Var represents a local variable or a function parameter.

type VarsByOffset

type VarsByOffset []*Var

VarsByOffset attaches the methods of sort.Interface to []*Var, sorting in increasing StackOffset.

func (VarsByOffset) Len

func (s VarsByOffset) Len() int

func (VarsByOffset) Less

func (s VarsByOffset) Less(i, j int) bool

func (VarsByOffset) Swap

func (s VarsByOffset) Swap(i, j int)

Jump to

Keyboard shortcuts

? : This menu
/ : Search site
f or F : Jump to
y or Y : Canonical URL