LCOV - code coverage report
Current view: top level - libdw - libdw.h (source / functions) Hit Total Coverage
Test: elfutils-0.189 Lines: 4 4 100.0 %
Date: 2023-08-28 19:26:08 Functions: 0 0 -
Legend: Lines: hit not hit | Branches: + taken - not taken # not executed Branches: 3 4 75.0 %

           Branch data     Line data    Source code
       1                 :            : /* Interfaces for libdw.
       2                 :            :    Copyright (C) 2002-2010, 2013, 2014, 2016, 2018 Red Hat, Inc.
       3                 :            :    This file is part of elfutils.
       4                 :            : 
       5                 :            :    This file is free software; you can redistribute it and/or modify
       6                 :            :    it under the terms of either
       7                 :            : 
       8                 :            :      * the GNU Lesser General Public License as published by the Free
       9                 :            :        Software Foundation; either version 3 of the License, or (at
      10                 :            :        your option) any later version
      11                 :            : 
      12                 :            :    or
      13                 :            : 
      14                 :            :      * the GNU General Public License as published by the Free
      15                 :            :        Software Foundation; either version 2 of the License, or (at
      16                 :            :        your option) any later version
      17                 :            : 
      18                 :            :    or both in parallel, as here.
      19                 :            : 
      20                 :            :    elfutils is distributed in the hope that it will be useful, but
      21                 :            :    WITHOUT ANY WARRANTY; without even the implied warranty of
      22                 :            :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      23                 :            :    General Public License for more details.
      24                 :            : 
      25                 :            :    You should have received copies of the GNU General Public License and
      26                 :            :    the GNU Lesser General Public License along with this program.  If
      27                 :            :    not, see <http://www.gnu.org/licenses/>.  */
      28                 :            : 
      29                 :            : #ifndef _LIBDW_H
      30                 :            : #define _LIBDW_H        1
      31                 :            : 
      32                 :            : #include <gelf.h>
      33                 :            : #include <stdbool.h>
      34                 :            : #include <stddef.h>
      35                 :            : #include <stdint.h>
      36                 :            : 
      37                 :            : /* Mode for the session.  */
      38                 :            : typedef enum
      39                 :            :   {
      40                 :            :     DWARF_C_READ,               /* Read .. */
      41                 :            :     DWARF_C_RDWR,               /* Read and write .. */
      42                 :            :     DWARF_C_WRITE,              /* Write .. */
      43                 :            :   }
      44                 :            : Dwarf_Cmd;
      45                 :            : 
      46                 :            : 
      47                 :            : /* Callback results.  */
      48                 :            : enum
      49                 :            : {
      50                 :            :   DWARF_CB_OK = 0,
      51                 :            :   DWARF_CB_ABORT
      52                 :            : };
      53                 :            : 
      54                 :            : 
      55                 :            : /* Error values.  */
      56                 :            : enum
      57                 :            :   {
      58                 :            :     DW_TAG_invalid = 0
      59                 :            : #define DW_TAG_invalid  DW_TAG_invalid
      60                 :            :   };
      61                 :            : 
      62                 :            : 
      63                 :            : /* Type for offset in DWARF file.  */
      64                 :            : typedef GElf_Off Dwarf_Off;
      65                 :            : 
      66                 :            : /* Type for address in DWARF file.  */
      67                 :            : typedef GElf_Addr Dwarf_Addr;
      68                 :            : 
      69                 :            : /* Integer types.  Big enough to hold any numeric value.  */
      70                 :            : typedef GElf_Xword Dwarf_Word;
      71                 :            : typedef GElf_Sxword Dwarf_Sword;
      72                 :            : /* For the times we know we do not need that much.  */
      73                 :            : typedef GElf_Half Dwarf_Half;
      74                 :            : 
      75                 :            : 
      76                 :            : /* DWARF abbreviation record.  */
      77                 :            : typedef struct Dwarf_Abbrev Dwarf_Abbrev;
      78                 :            : 
      79                 :            : /* Returned to show the last DIE has be returned.  */
      80                 :            : #define DWARF_END_ABBREV ((Dwarf_Abbrev *) -1l)
      81                 :            : 
      82                 :            : /* Source code line information for CU.  */
      83                 :            : typedef struct Dwarf_Lines_s Dwarf_Lines;
      84                 :            : 
      85                 :            : /* One source code line information.  */
      86                 :            : typedef struct Dwarf_Line_s Dwarf_Line;
      87                 :            : 
      88                 :            : /* Source file information.  */
      89                 :            : typedef struct Dwarf_Files_s Dwarf_Files;
      90                 :            : 
      91                 :            : /* One address range record.  */
      92                 :            : typedef struct Dwarf_Arange_s Dwarf_Arange;
      93                 :            : 
      94                 :            : /* Address ranges of a file.  */
      95                 :            : typedef struct Dwarf_Aranges_s Dwarf_Aranges;
      96                 :            : 
      97                 :            : /* CU representation.  */
      98                 :            : struct Dwarf_CU;
      99                 :            : typedef struct Dwarf_CU Dwarf_CU;
     100                 :            : 
     101                 :            : /* Macro information.  */
     102                 :            : typedef struct Dwarf_Macro_s Dwarf_Macro;
     103                 :            : 
     104                 :            : /* Attribute representation.  */
     105                 :            : typedef struct
     106                 :            : {
     107                 :            :   unsigned int code;
     108                 :            :   unsigned int form;
     109                 :            :   unsigned char *valp;
     110                 :            :   struct Dwarf_CU *cu;
     111                 :            : } Dwarf_Attribute;
     112                 :            : 
     113                 :            : 
     114                 :            : /* Data block representation.  */
     115                 :            : typedef struct
     116                 :            : {
     117                 :            :   Dwarf_Word length;
     118                 :            :   unsigned char *data;
     119                 :            : } Dwarf_Block;
     120                 :            : 
     121                 :            : 
     122                 :            : /* DIE information.  */
     123                 :            : typedef struct
     124                 :            : {
     125                 :            :   /* The offset can be computed from the address.  */
     126                 :            :   void *addr;
     127                 :            :   struct Dwarf_CU *cu;
     128                 :            :   Dwarf_Abbrev *abbrev;
     129                 :            :   // XXX We'll see what other information will be needed.
     130                 :            :   long int padding__;
     131                 :            : } Dwarf_Die;
     132                 :            : 
     133                 :            : /* Returned to show the last DIE has be returned.  */
     134                 :            : #define DWARF_END_DIE ((Dwarf_Die *) -1l)
     135                 :            : 
     136                 :            : 
     137                 :            : /* Global symbol information.  */
     138                 :            : typedef struct
     139                 :            : {
     140                 :            :   Dwarf_Off cu_offset;
     141                 :            :   Dwarf_Off die_offset;
     142                 :            :   const char *name;
     143                 :            : } Dwarf_Global;
     144                 :            : 
     145                 :            : 
     146                 :            : /* One operation in a DWARF location expression.
     147                 :            :    A location expression is an array of these.  */
     148                 :            : typedef struct
     149                 :            : {
     150                 :            :   uint8_t atom;                 /* Operation */
     151                 :            :   Dwarf_Word number;            /* Operand */
     152                 :            :   Dwarf_Word number2;           /* Possible second operand */
     153                 :            :   Dwarf_Word offset;            /* Offset in location expression */
     154                 :            : } Dwarf_Op;
     155                 :            : 
     156                 :            : 
     157                 :            : /* This describes one Common Information Entry read from a CFI section.
     158                 :            :    Pointers here point into the DATA->d_buf block passed to dwarf_next_cfi.  */
     159                 :            : typedef struct
     160                 :            : {
     161                 :            :   Dwarf_Off CIE_id;      /* Always DW_CIE_ID_64 in Dwarf_CIE structures.  */
     162                 :            : 
     163                 :            :   /* Instruction stream describing initial state used by FDEs.  If
     164                 :            :      we did not understand the whole augmentation string and it did
     165                 :            :      not use 'z', then there might be more augmentation data here
     166                 :            :      (and in FDEs) before the actual instructions.  */
     167                 :            :   const uint8_t *initial_instructions;
     168                 :            :   const uint8_t *initial_instructions_end;
     169                 :            : 
     170                 :            :   Dwarf_Word code_alignment_factor;
     171                 :            :   Dwarf_Sword data_alignment_factor;
     172                 :            :   Dwarf_Word return_address_register;
     173                 :            : 
     174                 :            :   const char *augmentation;     /* Augmentation string.  */
     175                 :            : 
     176                 :            :   /* Augmentation data, might be NULL.  The size is correct only if
     177                 :            :      we understood the augmentation string sufficiently.  */
     178                 :            :   const uint8_t *augmentation_data;
     179                 :            :   size_t augmentation_data_size;
     180                 :            :   size_t fde_augmentation_data_size;
     181                 :            : } Dwarf_CIE;
     182                 :            : 
     183                 :            : /* This describes one Frame Description Entry read from a CFI section.
     184                 :            :    Pointers here point into the DATA->d_buf block passed to dwarf_next_cfi.  */
     185                 :            : typedef struct
     186                 :            : {
     187                 :            :   /* Section offset of CIE this FDE refers to.  This will never be
     188                 :            :      DW_CIE_ID_64 in an FDE.  If this value is DW_CIE_ID_64, this is
     189                 :            :      actually a Dwarf_CIE structure.  */
     190                 :            :   Dwarf_Off CIE_pointer;
     191                 :            : 
     192                 :            :   /* We can't really decode anything further without looking up the CIE
     193                 :            :      and checking its augmentation string.  Here follows the encoded
     194                 :            :      initial_location and address_range, then any augmentation data,
     195                 :            :      then the instruction stream.  This FDE describes PC locations in
     196                 :            :      the byte range [initial_location, initial_location+address_range).
     197                 :            :      When the CIE augmentation string uses 'z', the augmentation data is
     198                 :            :      a DW_FORM_block (self-sized).  Otherwise, when we understand the
     199                 :            :      augmentation string completely, fde_augmentation_data_size gives
     200                 :            :      the number of bytes of augmentation data before the instructions.  */
     201                 :            :   const uint8_t *start;
     202                 :            :   const uint8_t *end;
     203                 :            : } Dwarf_FDE;
     204                 :            : 
     205                 :            : /* Each entry in a CFI section is either a CIE described by Dwarf_CIE or
     206                 :            :    an FDE described by Dward_FDE.  Check CIE_id to see which you have.  */
     207                 :            : typedef union
     208                 :            : {
     209                 :            :   Dwarf_Off CIE_id;      /* Always DW_CIE_ID_64 in Dwarf_CIE structures.  */
     210                 :            :   Dwarf_CIE cie;
     211                 :            :   Dwarf_FDE fde;
     212                 :            : } Dwarf_CFI_Entry;
     213                 :            : 
     214                 :            : /* Same as DW_CIE_ID_64 from dwarf.h to keep libdw.h independent.  */
     215                 :            : #define LIBDW_CIE_ID 0xffffffffffffffffULL
     216                 :            : #define dwarf_cfi_cie_p(entry)  ((entry)->cie.CIE_id == LIBDW_CIE_ID)
     217                 :            : 
     218                 :            : /* Opaque type representing a frame state described by CFI.  */
     219                 :            : typedef struct Dwarf_Frame_s Dwarf_Frame;
     220                 :            : 
     221                 :            : /* Opaque type representing a CFI section found in a DWARF or ELF file.  */
     222                 :            : typedef struct Dwarf_CFI_s Dwarf_CFI;
     223                 :            : 
     224                 :            : 
     225                 :            : /* Handle for debug sessions.  */
     226                 :            : typedef struct Dwarf Dwarf;
     227                 :            : 
     228                 :            : 
     229                 :            : /* Out-Of-Memory handler.  */
     230                 :            : typedef void (*__noreturn_attribute__ Dwarf_OOM) (void);
     231                 :            : 
     232                 :            : 
     233                 :            : #ifdef __cplusplus
     234                 :            : extern "C" {
     235                 :            : #endif
     236                 :            : 
     237                 :            : /* Create a handle for a new debug session.  */
     238                 :            : extern Dwarf *dwarf_begin (int fildes, Dwarf_Cmd cmd);
     239                 :            : 
     240                 :            : /* Create a handle for a new debug session for an ELF file.  */
     241                 :            : extern Dwarf *dwarf_begin_elf (Elf *elf, Dwarf_Cmd cmd, Elf_Scn *scngrp);
     242                 :            : 
     243                 :            : /* Retrieve ELF descriptor used for DWARF access.  */
     244                 :            : extern Elf *dwarf_getelf (Dwarf *dwarf);
     245                 :            : 
     246                 :            : /* Retrieve DWARF descriptor used for a Dwarf_Die or Dwarf_Attribute.
     247                 :            :    A Dwarf_Die or a Dwarf_Attribute is associated with a particular
     248                 :            :    Dwarf_CU handle.  This function returns the DWARF descriptor for
     249                 :            :    that Dwarf_CU.  */
     250                 :            : extern Dwarf *dwarf_cu_getdwarf (Dwarf_CU *cu);
     251                 :            : 
     252                 :            : /* Retrieves the DWARF descriptor for debugaltlink data.  Returns NULL
     253                 :            :    if no alternate debug data has been supplied yet.  libdw will try
     254                 :            :    to set the alt file on first use of an alt FORM if not yet explicitly
     255                 :            :    provided by dwarf_setalt.  */
     256                 :            : extern Dwarf *dwarf_getalt (Dwarf *main);
     257                 :            : 
     258                 :            : /* Provides the data referenced by the .gnu_debugaltlink section.  The
     259                 :            :    caller should check that MAIN and ALT match (i.e., they have the
     260                 :            :    same build ID).  It is the responsibility of the caller to ensure
     261                 :            :    that the data referenced by ALT stays valid while it is used by
     262                 :            :    MAIN, until dwarf_setalt is called on MAIN with a different
     263                 :            :    descriptor, or dwarf_end.  Must be called before inspecting DIEs
     264                 :            :    that might have alt FORMs.  Otherwise libdw will try to set the
     265                 :            :    alt file itself on first use.  */
     266                 :            : extern void dwarf_setalt (Dwarf *main, Dwarf *alt);
     267                 :            : 
     268                 :            : /* Release debugging handling context.  */
     269                 :            : extern int dwarf_end (Dwarf *dwarf);
     270                 :            : 
     271                 :            : 
     272                 :            : /* Read the header for the DWARF CU.  */
     273                 :            : extern int dwarf_nextcu (Dwarf *dwarf, Dwarf_Off off, Dwarf_Off *next_off,
     274                 :            :                          size_t *header_sizep, Dwarf_Off *abbrev_offsetp,
     275                 :            :                          uint8_t *address_sizep, uint8_t *offset_sizep)
     276                 :            :      __nonnull_attribute__ (3);
     277                 :            : 
     278                 :            : /* Read the header of a DWARF CU or type unit.  If TYPE_SIGNATUREP is not
     279                 :            :    null, this reads a type unit from the .debug_types section; otherwise
     280                 :            :    this reads a CU from the .debug_info section.  */
     281                 :            : extern int dwarf_next_unit (Dwarf *dwarf, Dwarf_Off off, Dwarf_Off *next_off,
     282                 :            :                             size_t *header_sizep, Dwarf_Half *versionp,
     283                 :            :                             Dwarf_Off *abbrev_offsetp,
     284                 :            :                             uint8_t *address_sizep, uint8_t *offset_sizep,
     285                 :            :                             uint64_t *type_signaturep, Dwarf_Off *type_offsetp)
     286                 :            :      __nonnull_attribute__ (3);
     287                 :            : 
     288                 :            : 
     289                 :            : /* Gets the next Dwarf_CU (unit), version, unit type and if available
     290                 :            :    the CU DIE and sub (type) DIE of the unit.  Returns 0 on success,
     291                 :            :    -1 on error or 1 if there are no more units.  To start iterating
     292                 :            :    provide NULL for CU.  If version < 5 the unit type is set from the
     293                 :            :    CU DIE if available (DW_UT_compile for DW_TAG_compile_unit,
     294                 :            :    DW_UT_type for DW_TAG_type_unit or DW_UT_partial for
     295                 :            :    DW_TAG_partial_unit), otherwise it is set to zero.  If unavailable
     296                 :            :    (the version or unit type is unknown) the CU DIE is cleared.
     297                 :            :    Likewise if the sub DIE isn't isn't available (the unit type is not
     298                 :            :    DW_UT_type or DW_UT_split_type) the sub DIE tag is cleared.  */
     299                 :            : extern int dwarf_get_units (Dwarf *dwarf, Dwarf_CU *cu, Dwarf_CU **next_cu,
     300                 :            :                             Dwarf_Half *version, uint8_t *unit_type,
     301                 :            :                             Dwarf_Die *cudie, Dwarf_Die *subdie)
     302                 :            :      __nonnull_attribute__ (3);
     303                 :            : 
     304                 :            : /* Provides information and DIEs associated with the given Dwarf_CU
     305                 :            :    unit.  Returns -1 on error, zero on success. Arguments not needed
     306                 :            :    may be NULL.  If they are NULL and aren't known yet, they won't be
     307                 :            :    looked up.  If the subdie doesn't exist for this unit_type it will
     308                 :            :    be cleared.  If there is no unit_id for this unit type it will be
     309                 :            :    set to zero.  */
     310                 :            : extern int dwarf_cu_info (Dwarf_CU *cu,
     311                 :            :                           Dwarf_Half *version, uint8_t *unit_type,
     312                 :            :                           Dwarf_Die *cudie, Dwarf_Die *subdie,
     313                 :            :                           uint64_t *unit_id,
     314                 :            :                           uint8_t *address_size, uint8_t *offset_size);
     315                 :            : 
     316                 :            : /* Decode one DWARF CFI entry (CIE or FDE) from the raw section data.
     317                 :            :    The E_IDENT from the originating ELF file indicates the address
     318                 :            :    size and byte order used in the CFI section contained in DATA;
     319                 :            :    EH_FRAME_P should be true for .eh_frame format and false for
     320                 :            :    .debug_frame format.  OFFSET is the byte position in the section
     321                 :            :    to start at; on return *NEXT_OFFSET is filled in with the byte
     322                 :            :    position immediately after this entry.
     323                 :            : 
     324                 :            :    On success, returns 0 and fills in *ENTRY; use dwarf_cfi_cie_p to
     325                 :            :    see whether ENTRY->cie or ENTRY->fde is valid.
     326                 :            : 
     327                 :            :    On errors, returns -1.  Some format errors will permit safely
     328                 :            :    skipping to the next CFI entry though the current one is unusable.
     329                 :            :    In that case, *NEXT_OFF will be updated before a -1 return.
     330                 :            : 
     331                 :            :    If there are no more CFI entries left in the section,
     332                 :            :    returns 1 and sets *NEXT_OFFSET to (Dwarf_Off) -1.  */
     333                 :            : extern int dwarf_next_cfi (const unsigned char e_ident[],
     334                 :            :                            Elf_Data *data, bool eh_frame_p,
     335                 :            :                            Dwarf_Off offset, Dwarf_Off *next_offset,
     336                 :            :                            Dwarf_CFI_Entry *entry)
     337                 :            :   __nonnull_attribute__ (1, 2, 5, 6);
     338                 :            : 
     339                 :            : /* Use the CFI in the DWARF .debug_frame section.
     340                 :            :    Returns NULL if there is no such section (not an error).
     341                 :            :    The pointer returned can be used until dwarf_end is called on DWARF,
     342                 :            :    and must not be passed to dwarf_cfi_end.
     343                 :            :    Calling this more than once returns the same pointer.  */
     344                 :            : extern Dwarf_CFI *dwarf_getcfi (Dwarf *dwarf);
     345                 :            : 
     346                 :            : /* Use the CFI in the ELF file's exception-handling data.
     347                 :            :    Returns NULL if there is no such data.
     348                 :            :    The pointer returned can be used until elf_end is called on ELF,
     349                 :            :    and must be passed to dwarf_cfi_end before then.
     350                 :            :    Calling this more than once allocates independent data structures.  */
     351                 :            : extern Dwarf_CFI *dwarf_getcfi_elf (Elf *elf);
     352                 :            : 
     353                 :            : /* Release resources allocated by dwarf_getcfi_elf.  */
     354                 :            : extern int dwarf_cfi_end (Dwarf_CFI *cache);
     355                 :            : 
     356                 :            : 
     357                 :            : /* Return DIE at given offset in .debug_info section.  */
     358                 :            : extern Dwarf_Die *dwarf_offdie (Dwarf *dbg, Dwarf_Off offset,
     359                 :            :                                 Dwarf_Die *result) __nonnull_attribute__ (3);
     360                 :            : 
     361                 :            : /* Return DIE at given offset in .debug_types section.  */
     362                 :            : extern Dwarf_Die *dwarf_offdie_types (Dwarf *dbg, Dwarf_Off offset,
     363                 :            :                                       Dwarf_Die *result)
     364                 :            :      __nonnull_attribute__ (3);
     365                 :            : 
     366                 :            : /* Return offset of DIE.  */
     367                 :            : extern Dwarf_Off dwarf_dieoffset (Dwarf_Die *die);
     368                 :            : 
     369                 :            : /* Return offset of DIE in CU.  */
     370                 :            : extern Dwarf_Off dwarf_cuoffset (Dwarf_Die *die);
     371                 :            : 
     372                 :            : /* Return CU DIE containing given DIE.  */
     373                 :            : extern Dwarf_Die *dwarf_diecu (Dwarf_Die *die, Dwarf_Die *result,
     374                 :            :                                uint8_t *address_sizep, uint8_t *offset_sizep)
     375                 :            :      __nonnull_attribute__ (2);
     376                 :            : 
     377                 :            : /* Given a Dwarf_Die addr returns a (reconstructed) Dwarf_Die, or NULL
     378                 :            :    if the given addr didn't come from a valid Dwarf_Die.  In particular
     379                 :            :    it will make sure that the correct Dwarf_CU pointer is set for the
     380                 :            :    Dwarf_Die, the Dwarf_Abbrev pointer will not be set up yet (it will
     381                 :            :    only be once the Dwarf_Die is used to read attributes, children or
     382                 :            :    siblings).  This functions can be used to keep a reference to a
     383                 :            :    Dwarf_Die which you want to refer to later.  The addr, and the result
     384                 :            :    of this function, is only valid while the associated Dwarf is valid.  */
     385                 :            : extern Dwarf_Die *dwarf_die_addr_die (Dwarf *dbg, void *addr,
     386                 :            :                                       Dwarf_Die *result)
     387                 :            :      __nonnull_attribute__ (3);
     388                 :            : 
     389                 :            : /* Return the CU DIE and the header info associated with a Dwarf_Die
     390                 :            :    or Dwarf_Attribute.  A Dwarf_Die or a Dwarf_Attribute is associated
     391                 :            :    with a particular Dwarf_CU handle.  This function returns the CU or
     392                 :            :    type unit DIE and header information for that Dwarf_CU.  The
     393                 :            :    returned DIE is either a compile_unit, partial_unit or type_unit.
     394                 :            :    If it is a type_unit, then the type signature and type offset are
     395                 :            :    also provided, otherwise type_offset will be set to zero.  See also
     396                 :            :    dwarf_diecu and dwarf_next_unit.  */
     397                 :            : extern Dwarf_Die *dwarf_cu_die (Dwarf_CU *cu, Dwarf_Die *result,
     398                 :            :                                 Dwarf_Half *versionp,
     399                 :            :                                 Dwarf_Off *abbrev_offsetp,
     400                 :            :                                 uint8_t *address_sizep,
     401                 :            :                                 uint8_t *offset_sizep,
     402                 :            :                                 uint64_t *type_signaturep,
     403                 :            :                                 Dwarf_Off *type_offsetp)
     404                 :            :      __nonnull_attribute__ (2);
     405                 :            : 
     406                 :            : /* Return CU DIE containing given address.  */
     407                 :            : extern Dwarf_Die *dwarf_addrdie (Dwarf *dbg, Dwarf_Addr addr,
     408                 :            :                                  Dwarf_Die *result) __nonnull_attribute__ (3);
     409                 :            : 
     410                 :            : /* Return child of current DIE.  */
     411                 :            : extern int dwarf_child (Dwarf_Die *die, Dwarf_Die *result)
     412                 :            :      __nonnull_attribute__ (2);
     413                 :            : 
     414                 :            : /* Locates the first sibling of DIE and places it in RESULT.
     415                 :            :    Returns 0 if a sibling was found, -1 if something went wrong.
     416                 :            :    Returns 1 if no sibling could be found and, if RESULT is not
     417                 :            :    the same as DIE, it sets RESULT->addr to the address of the
     418                 :            :    (non-sibling) DIE that follows this one, or NULL if this DIE
     419                 :            :    was the last one in the compilation unit.  */
     420                 :            : extern int dwarf_siblingof (Dwarf_Die *die, Dwarf_Die *result)
     421                 :            :      __nonnull_attribute__ (2);
     422                 :            : 
     423                 :            : /* For type aliases and qualifier type DIEs, which don't modify or
     424                 :            :    change the structural layout of the underlying type, follow the
     425                 :            :    DW_AT_type attribute (recursively) and return the underlying type
     426                 :            :    Dwarf_Die.
     427                 :            : 
     428                 :            :    Returns 0 when RESULT contains a Dwarf_Die (possibly equal to the
     429                 :            :    given DIE) that isn't a type alias or qualifier type.  Returns 1
     430                 :            :    when RESULT contains a type alias or qualifier Dwarf_Die that
     431                 :            :    couldn't be peeled further (it doesn't have a DW_TAG_type
     432                 :            :    attribute).  Returns -1 when an error occurred.
     433                 :            : 
     434                 :            :    The current DWARF specification defines one type alias tag
     435                 :            :    (DW_TAG_typedef) and seven modifier/qualifier type tags
     436                 :            :    (DW_TAG_const_type, DW_TAG_volatile_type, DW_TAG_restrict_type,
     437                 :            :    DW_TAG_atomic_type, DW_TAG_immutable_type, DW_TAG_packed_type and
     438                 :            :    DW_TAG_shared_type).  This function won't peel modifier type
     439                 :            :    tags that change the way the underlying type is accessed such
     440                 :            :    as the pointer or reference type tags (DW_TAG_pointer_type,
     441                 :            :    DW_TAG_reference_type or DW_TAG_rvalue_reference_type).
     442                 :            : 
     443                 :            :    A future version of this function might peel other alias or
     444                 :            :    qualifier type tags if a future DWARF version or GNU extension
     445                 :            :    defines other type aliases or qualifier type tags that don't modify,
     446                 :            :    change the structural layout or the way to access the underlying type.  */
     447                 :            : extern int dwarf_peel_type (Dwarf_Die *die, Dwarf_Die *result)
     448                 :            :     __nonnull_attribute__ (2);
     449                 :            : 
     450                 :            : /* Check whether the DIE has children.  */
     451                 :            : extern int dwarf_haschildren (Dwarf_Die *die) __nonnull_attribute__ (1);
     452                 :            : 
     453                 :            : /* Walks the attributes of DIE, starting at the one OFFSET bytes in,
     454                 :            :    calling the CALLBACK function for each one.  Stops if the callback
     455                 :            :    function ever returns a value other than DWARF_CB_OK and returns the
     456                 :            :    offset of the offending attribute.  If the end of the attributes
     457                 :            :    is reached 1 is returned.  If something goes wrong -1 is returned and
     458                 :            :    the dwarf error number is set.  */
     459                 :            : extern ptrdiff_t dwarf_getattrs (Dwarf_Die *die,
     460                 :            :                                  int (*callback) (Dwarf_Attribute *, void *),
     461                 :            :                                  void *arg, ptrdiff_t offset)
     462                 :            :      __nonnull_attribute__ (2);
     463                 :            : 
     464                 :            : /* Return tag of given DIE.  */
     465                 :            : extern int dwarf_tag (Dwarf_Die *die) __nonnull_attribute__ (1);
     466                 :            : 
     467                 :            : 
     468                 :            : /* Return specific attribute of DIE.  */
     469                 :            : extern Dwarf_Attribute *dwarf_attr (Dwarf_Die *die, unsigned int search_name,
     470                 :            :                                     Dwarf_Attribute *result)
     471                 :            :      __nonnull_attribute__ (3);
     472                 :            : 
     473                 :            : /* Check whether given DIE has specific attribute.  */
     474                 :            : extern int dwarf_hasattr (Dwarf_Die *die, unsigned int search_name);
     475                 :            : 
     476                 :            : /* These are the same as dwarf_attr and dwarf_hasattr, respectively,
     477                 :            :    but they resolve an indirect attribute through
     478                 :            :    DW_AT_abstract_origin, DW_AT_specification or, if the DIE is a
     479                 :            :    top-level split CU, the skeleton DIE.  Note that the attribute
     480                 :            :    might come from a DIE in a different CU (possibly from a different
     481                 :            :    Dwarf file).  In that case all attribute information needs to be
     482                 :            :    resolved through the CU associated with the returned
     483                 :            :    Dwarf_Attribute.  The dwarf_form functions already do this
     484                 :            :    automatically.  */
     485                 :            : extern Dwarf_Attribute *dwarf_attr_integrate (Dwarf_Die *die,
     486                 :            :                                               unsigned int search_name,
     487                 :            :                                               Dwarf_Attribute *result)
     488                 :            :      __nonnull_attribute__ (3);
     489                 :            : extern int dwarf_hasattr_integrate (Dwarf_Die *die, unsigned int search_name);
     490                 :            : 
     491                 :            : 
     492                 :            : 
     493                 :            : 
     494                 :            : /* Check whether given attribute has specific form.  */
     495                 :            : extern int dwarf_hasform (Dwarf_Attribute *attr, unsigned int search_form);
     496                 :            : 
     497                 :            : /* Return attribute code of given attribute.  */
     498                 :            : extern unsigned int dwarf_whatattr (Dwarf_Attribute *attr);
     499                 :            : 
     500                 :            : /* Return form code of given attribute.  */
     501                 :            : extern unsigned int dwarf_whatform (Dwarf_Attribute *attr);
     502                 :            : 
     503                 :            : 
     504                 :            : /* Return string associated with given attribute.  */
     505                 :            : extern const char *dwarf_formstring (Dwarf_Attribute *attrp);
     506                 :            : 
     507                 :            : /* Return unsigned constant represented by attribute.  */
     508                 :            : extern int dwarf_formudata (Dwarf_Attribute *attr, Dwarf_Word *return_uval)
     509                 :            :      __nonnull_attribute__ (2);
     510                 :            : 
     511                 :            : /* Return signed constant represented by attribute.  */
     512                 :            : extern int dwarf_formsdata (Dwarf_Attribute *attr, Dwarf_Sword *return_uval)
     513                 :            :      __nonnull_attribute__ (2);
     514                 :            : 
     515                 :            : /* Return address represented by attribute.  */
     516                 :            : extern int dwarf_formaddr (Dwarf_Attribute *attr, Dwarf_Addr *return_addr)
     517                 :            :      __nonnull_attribute__ (2);
     518                 :            : 
     519                 :            : /* This function is deprecated.  Always use dwarf_formref_die instead.
     520                 :            :    Return reference offset represented by attribute.  */
     521                 :            : extern int dwarf_formref (Dwarf_Attribute *attr, Dwarf_Off *return_offset)
     522                 :            :      __nonnull_attribute__ (2) __deprecated_attribute__;
     523                 :            : 
     524                 :            : /* Look up the DIE in a reference-form attribute.  */
     525                 :            : extern Dwarf_Die *dwarf_formref_die (Dwarf_Attribute *attr, Dwarf_Die *die_mem)
     526                 :            :      __nonnull_attribute__ (2);
     527                 :            : 
     528                 :            : /* Return block represented by attribute.  */
     529                 :            : extern int dwarf_formblock (Dwarf_Attribute *attr, Dwarf_Block *return_block)
     530                 :            :      __nonnull_attribute__ (2);
     531                 :            : 
     532                 :            : /* Return flag represented by attribute.  */
     533                 :            : extern int dwarf_formflag (Dwarf_Attribute *attr, bool *return_bool)
     534                 :            :      __nonnull_attribute__ (2);
     535                 :            : 
     536                 :            : 
     537                 :            : /* Simplified attribute value access functions.  */
     538                 :            : 
     539                 :            : /* Return string in name attribute of DIE.  */
     540                 :            : extern const char *dwarf_diename (Dwarf_Die *die);
     541                 :            : 
     542                 :            : /* Return high PC attribute of DIE.  */
     543                 :            : extern int dwarf_highpc (Dwarf_Die *die, Dwarf_Addr *return_addr)
     544                 :            :      __nonnull_attribute__ (2);
     545                 :            : 
     546                 :            : /* Return low PC attribute of DIE.  */
     547                 :            : extern int dwarf_lowpc (Dwarf_Die *die, Dwarf_Addr *return_addr)
     548                 :            :      __nonnull_attribute__ (2);
     549                 :            : 
     550                 :            : /* Return entry_pc or low_pc attribute of DIE.  */
     551                 :            : extern int dwarf_entrypc (Dwarf_Die *die, Dwarf_Addr *return_addr)
     552                 :            :      __nonnull_attribute__ (2);
     553                 :            : 
     554                 :            : /* Return 1 if DIE's lowpc/highpc or ranges attributes match the PC address,
     555                 :            :    0 if not, or -1 for errors.  */
     556                 :            : extern int dwarf_haspc (Dwarf_Die *die, Dwarf_Addr pc);
     557                 :            : 
     558                 :            : /* Enumerate the PC address ranges covered by this DIE, covering all
     559                 :            :    addresses where dwarf_haspc returns true.  In the first call OFFSET
     560                 :            :    should be zero and *BASEP need not be initialized.  Returns -1 for
     561                 :            :    errors, zero when there are no more address ranges to report, or a
     562                 :            :    nonzero OFFSET value to pass to the next call.  Each subsequent call
     563                 :            :    must preserve *BASEP from the prior call.  Successful calls fill in
     564                 :            :    *STARTP and *ENDP with a contiguous address range.  */
     565                 :            : extern ptrdiff_t dwarf_ranges (Dwarf_Die *die,
     566                 :            :                                ptrdiff_t offset, Dwarf_Addr *basep,
     567                 :            :                                Dwarf_Addr *startp, Dwarf_Addr *endp);
     568                 :            : 
     569                 :            : 
     570                 :            : /* Return byte size attribute of DIE.  */
     571                 :            : extern int dwarf_bytesize (Dwarf_Die *die);
     572                 :            : 
     573                 :            : /* Return bit size attribute of DIE.  */
     574                 :            : extern int dwarf_bitsize (Dwarf_Die *die);
     575                 :            : 
     576                 :            : /* Return bit offset attribute of DIE.  */
     577                 :            : extern int dwarf_bitoffset (Dwarf_Die *die);
     578                 :            : 
     579                 :            : /* Return array order attribute of DIE.  */
     580                 :            : extern int dwarf_arrayorder (Dwarf_Die *die);
     581                 :            : 
     582                 :            : /* Return source language attribute of DIE.  */
     583                 :            : extern int dwarf_srclang (Dwarf_Die *die);
     584                 :            : 
     585                 :            : 
     586                 :            : /* Get abbreviation at given offset for given DIE.  */
     587                 :            : extern Dwarf_Abbrev *dwarf_getabbrev (Dwarf_Die *die, Dwarf_Off offset,
     588                 :            :                                       size_t *lengthp);
     589                 :            : 
     590                 :            : /* Get abbreviation at given offset in .debug_abbrev section.  */
     591                 :            : extern int dwarf_offabbrev (Dwarf *dbg, Dwarf_Off offset, size_t *lengthp,
     592                 :            :                             Dwarf_Abbrev *abbrevp)
     593                 :            :      __nonnull_attribute__ (4);
     594                 :            : 
     595                 :            : /* Get abbreviation code.  */
     596                 :            : extern unsigned int dwarf_getabbrevcode (Dwarf_Abbrev *abbrev);
     597                 :            : 
     598                 :            : /* Get abbreviation tag.  */
     599                 :            : extern unsigned int dwarf_getabbrevtag (Dwarf_Abbrev *abbrev);
     600                 :            : 
     601                 :            : /* Return true if abbreviation is children flag set.  */
     602                 :            : extern int dwarf_abbrevhaschildren (Dwarf_Abbrev *abbrev);
     603                 :            : 
     604                 :            : /* Get number of attributes of abbreviation.  */
     605                 :            : extern int dwarf_getattrcnt (Dwarf_Abbrev *abbrev, size_t *attrcntp)
     606                 :            :      __nonnull_attribute__ (2);
     607                 :            : 
     608                 :            : /* Get specific attribute of abbreviation.  */
     609                 :            : extern int dwarf_getabbrevattr (Dwarf_Abbrev *abbrev, size_t idx,
     610                 :            :                                 unsigned int *namep, unsigned int *formp,
     611                 :            :                                 Dwarf_Off *offset);
     612                 :            : 
     613                 :            : /* Get specific attribute of abbreviation and any data encoded with it.
     614                 :            :    Specifically for DW_FORM_implicit_const data will be set to the
     615                 :            :    constant value associated.  */
     616                 :            : extern int dwarf_getabbrevattr_data (Dwarf_Abbrev *abbrev, size_t idx,
     617                 :            :                                      unsigned int *namep, unsigned int *formp,
     618                 :            :                                      Dwarf_Sword *datap, Dwarf_Off *offset);
     619                 :            : 
     620                 :            : /* Get string from-debug_str section.  */
     621                 :            : extern const char *dwarf_getstring (Dwarf *dbg, Dwarf_Off offset,
     622                 :            :                                     size_t *lenp);
     623                 :            : 
     624                 :            : 
     625                 :            : /* Get public symbol information.  */
     626                 :            : extern ptrdiff_t dwarf_getpubnames (Dwarf *dbg,
     627                 :            :                                     int (*callback) (Dwarf *, Dwarf_Global *,
     628                 :            :                                                      void *),
     629                 :            :                                     void *arg, ptrdiff_t offset)
     630                 :            :      __nonnull_attribute__ (2);
     631                 :            : 
     632                 :            : 
     633                 :            : /* Get source file information for CU.  */
     634                 :            : extern int dwarf_getsrclines (Dwarf_Die *cudie, Dwarf_Lines **lines,
     635                 :            :                               size_t *nlines) __nonnull_attribute__ (2, 3);
     636                 :            : 
     637                 :            : /* Return one of the source lines of the CU.  */
     638                 :            : extern Dwarf_Line *dwarf_onesrcline (Dwarf_Lines *lines, size_t idx);
     639                 :            : 
     640                 :            : /* Get the file source files used in the CU.  */
     641                 :            : extern int dwarf_getsrcfiles (Dwarf_Die *cudie, Dwarf_Files **files,
     642                 :            :                               size_t *nfiles)
     643                 :            :      __nonnull_attribute__ (2);
     644                 :            : 
     645                 :            : 
     646                 :            : /* Get source for address in CU.  */
     647                 :            : extern Dwarf_Line *dwarf_getsrc_die (Dwarf_Die *cudie, Dwarf_Addr addr);
     648                 :            : 
     649                 :            : /* Get source for file and line number.  */
     650                 :            : extern int dwarf_getsrc_file (Dwarf *dbg, const char *fname, int line, int col,
     651                 :            :                               Dwarf_Line ***srcsp, size_t *nsrcs)
     652                 :            :      __nonnull_attribute__ (2, 5, 6);
     653                 :            : 
     654                 :            : 
     655                 :            : /* Return line address.  */
     656                 :            : extern int dwarf_lineaddr (Dwarf_Line *line, Dwarf_Addr *addrp);
     657                 :            : 
     658                 :            : /* Return line VLIW operation index.  */
     659                 :            : extern int dwarf_lineop_index (Dwarf_Line *line, unsigned int *op_indexp);
     660                 :            : 
     661                 :            : /* Return line number.  */
     662                 :            : extern int dwarf_lineno (Dwarf_Line *line, int *linep)
     663                 :            :      __nonnull_attribute__ (2);
     664                 :            : 
     665                 :            : /* Return column in line.  */
     666                 :            : extern int dwarf_linecol (Dwarf_Line *line, int *colp)
     667                 :            :      __nonnull_attribute__ (2);
     668                 :            : 
     669                 :            : /* Return true if record is for beginning of a statement.  */
     670                 :            : extern int dwarf_linebeginstatement (Dwarf_Line *line, bool *flagp)
     671                 :            :      __nonnull_attribute__ (2);
     672                 :            : 
     673                 :            : /* Return true if record is for end of sequence.  */
     674                 :            : extern int dwarf_lineendsequence (Dwarf_Line *line, bool *flagp)
     675                 :            :      __nonnull_attribute__ (2);
     676                 :            : 
     677                 :            : /* Return true if record is for beginning of a basic block.  */
     678                 :            : extern int dwarf_lineblock (Dwarf_Line *line, bool *flagp)
     679                 :            :      __nonnull_attribute__ (2);
     680                 :            : 
     681                 :            : /* Return true if record is for end of prologue.  */
     682                 :            : extern int dwarf_lineprologueend (Dwarf_Line *line, bool *flagp)
     683                 :            :      __nonnull_attribute__ (2);
     684                 :            : 
     685                 :            : /* Return true if record is for beginning of epilogue.  */
     686                 :            : extern int dwarf_lineepiloguebegin (Dwarf_Line *line, bool *flagp)
     687                 :            :      __nonnull_attribute__ (2);
     688                 :            : 
     689                 :            : /* Return instruction-set architecture in this record.  */
     690                 :            : extern int dwarf_lineisa (Dwarf_Line *line, unsigned int *isap)
     691                 :            :      __nonnull_attribute__ (2);
     692                 :            : 
     693                 :            : /* Return code path discriminator in this record.  */
     694                 :            : extern int dwarf_linediscriminator (Dwarf_Line *line, unsigned int *discp)
     695                 :            :      __nonnull_attribute__ (2);
     696                 :            : 
     697                 :            : 
     698                 :            : /* Find line information for address.  The returned string is NULL when
     699                 :            :    an error occurred, or the file path.  The file path is either absolute
     700                 :            :    or relative to the compilation directory.  See dwarf_decl_file.  */
     701                 :            : extern const char *dwarf_linesrc (Dwarf_Line *line,
     702                 :            :                                   Dwarf_Word *mtime, Dwarf_Word *length);
     703                 :            : 
     704                 :            : /* Return the caller of this line if inlined.  If not inlined,
     705                 :            :    return NULL.  */
     706                 :            : extern Dwarf_Line *dwarf_linecontext (Dwarf_Lines *lines, Dwarf_Line *line);
     707                 :            : 
     708                 :            : /* Return the function name in this line record. If this line is
     709                 :            :    inlined, this is the name of the function that was inlined. If this line
     710                 :            :    is not inlined, return NULL.  */
     711                 :            : extern const char *dwarf_linefunctionname (Dwarf *dbg, Dwarf_Line *line);
     712                 :            : 
     713                 :            : /* Return file information.  The returned string is NULL when
     714                 :            :    an error occurred, or the file path.  The file path is either absolute
     715                 :            :    or relative to the compilation directory.  See dwarf_decl_file.  */
     716                 :            : extern const char *dwarf_filesrc (Dwarf_Files *file, size_t idx,
     717                 :            :                                   Dwarf_Word *mtime, Dwarf_Word *length);
     718                 :            : 
     719                 :            : /* Return the Dwarf_Files and index associated with the given Dwarf_Line.  */
     720                 :            : extern int dwarf_line_file (Dwarf_Line *line,
     721                 :            :                             Dwarf_Files **files, size_t *idx)
     722                 :            :     __nonnull_attribute__ (2, 3);
     723                 :            : 
     724                 :            : /* Return the directory list used in the file information extracted.
     725                 :            :    (*RESULT)[0] is the CU's DW_AT_comp_dir value, and may be null.
     726                 :            :    (*RESULT)[0..*NDIRS-1] are the compile-time include directory path
     727                 :            :    encoded by the compiler.  */
     728                 :            : extern int dwarf_getsrcdirs (Dwarf_Files *files,
     729                 :            :                              const char *const **result, size_t *ndirs)
     730                 :            :   __nonnull_attribute__ (2, 3);
     731                 :            : 
     732                 :            : /* Iterates through the debug line units.  Returns 0 on success, -1 on
     733                 :            :    error or 1 if there are no more units.  To start iterating use zero
     734                 :            :    for OFF and set *CU to NULL.  On success NEXT_OFF will be set to
     735                 :            :    the next offset to use.  The *CU will be set if this line table
     736                 :            :    needed a specific CU and needs to be given when calling
     737                 :            :    dwarf_next_lines again (to help dwarf_next_lines quickly find the
     738                 :            :    next CU).  *CU might be set to NULL when it couldn't be found (the
     739                 :            :    compilation directory entry will be the empty string in that case)
     740                 :            :    or for DWARF 5 or later tables, which are self contained.  SRCFILES
     741                 :            :    and SRCLINES may be NULL if the caller is not interested in the
     742                 :            :    actual line or file table.  On success and when not NULL, NFILES
     743                 :            :    and NLINES will be set to the number of files in the file table and
     744                 :            :    number of lines in the line table.  */
     745                 :            : extern int dwarf_next_lines (Dwarf *dwarf, Dwarf_Off off,
     746                 :            :                              Dwarf_Off *next_off, Dwarf_CU **cu,
     747                 :            :                              Dwarf_Files **srcfiles, size_t *nfiles,
     748                 :            :                              Dwarf_Lines **srclines, size_t *nlines)
     749                 :            :   __nonnull_attribute__ (3,4);
     750                 :            : 
     751                 :            : /* Return location expression, decoded as a list of operations.  */
     752                 :            : extern int dwarf_getlocation (Dwarf_Attribute *attr, Dwarf_Op **expr,
     753                 :            :                               size_t *exprlen) __nonnull_attribute__ (2, 3);
     754                 :            : 
     755                 :            : /* Return location expressions.  If the attribute uses a location list,
     756                 :            :    ADDRESS selects the relevant location expressions from the list.
     757                 :            :    There can be multiple matches, resulting in multiple expressions to
     758                 :            :    return.  EXPRS and EXPRLENS are parallel arrays of NLOCS slots to
     759                 :            :    fill in.  Returns the number of locations filled in, or -1 for
     760                 :            :    errors.  If EXPRS is a null pointer, stores nothing and returns the
     761                 :            :    total number of locations.  A return value of zero means that the
     762                 :            :    location list indicated no value is accessible.  */
     763                 :            : extern int dwarf_getlocation_addr (Dwarf_Attribute *attr, Dwarf_Addr address,
     764                 :            :                                    Dwarf_Op **exprs, size_t *exprlens,
     765                 :            :                                    size_t nlocs);
     766                 :            : 
     767                 :            : /* Enumerate the locations ranges and descriptions covered by the
     768                 :            :    given attribute.  In the first call OFFSET should be zero and
     769                 :            :    *BASEP need not be initialized.  Returns -1 for errors, zero when
     770                 :            :    there are no more locations to report, or a nonzero OFFSET
     771                 :            :    value to pass to the next call.  Each subsequent call must preserve
     772                 :            :    *BASEP from the prior call.  Successful calls fill in *STARTP and
     773                 :            :    *ENDP with a contiguous address range and *EXPR with a pointer to
     774                 :            :    an array of operations with length *EXPRLEN.  If the attribute
     775                 :            :    describes a single location description and not a location list the
     776                 :            :    first call (with OFFSET zero) will return the location description
     777                 :            :    in *EXPR with *STARTP set to zero and *ENDP set to minus one.  */
     778                 :            : extern ptrdiff_t dwarf_getlocations (Dwarf_Attribute *attr,
     779                 :            :                                      ptrdiff_t offset, Dwarf_Addr *basep,
     780                 :            :                                      Dwarf_Addr *startp, Dwarf_Addr *endp,
     781                 :            :                                      Dwarf_Op **expr, size_t *exprlen);
     782                 :            : 
     783                 :            : /* Return the block associated with a DW_OP_implicit_value operation.
     784                 :            :    The OP pointer must point into an expression that dwarf_getlocation
     785                 :            :    or dwarf_getlocation_addr has returned given the same ATTR.  */
     786                 :            : extern int dwarf_getlocation_implicit_value (Dwarf_Attribute *attr,
     787                 :            :                                              const Dwarf_Op *op,
     788                 :            :                                              Dwarf_Block *return_block)
     789                 :            :   __nonnull_attribute__ (2, 3);
     790                 :            : 
     791                 :            : /* Return the attribute indicated by a DW_OP_GNU_implicit_pointer operation.
     792                 :            :    The OP pointer must point into an expression that dwarf_getlocation
     793                 :            :    or dwarf_getlocation_addr has returned given the same ATTR.
     794                 :            :    The result is the DW_AT_location or DW_AT_const_value attribute
     795                 :            :    of the OP->number DIE.  */
     796                 :            : extern int dwarf_getlocation_implicit_pointer (Dwarf_Attribute *attr,
     797                 :            :                                                const Dwarf_Op *op,
     798                 :            :                                                Dwarf_Attribute *result)
     799                 :            :   __nonnull_attribute__ (2, 3);
     800                 :            : 
     801                 :            : /* Return the DIE associated with an operation such as
     802                 :            :    DW_OP_GNU_implicit_pointer, DW_OP_GNU_parameter_ref, DW_OP_GNU_convert,
     803                 :            :    DW_OP_GNU_reinterpret, DW_OP_GNU_const_type, DW_OP_GNU_regval_type or
     804                 :            :    DW_OP_GNU_deref_type.  The OP pointer must point into an expression that
     805                 :            :    dwarf_getlocation or dwarf_getlocation_addr has returned given the same
     806                 :            :    ATTR.  The RESULT is a DIE that expresses a type or value needed by the
     807                 :            :    given OP.  */
     808                 :            : extern int dwarf_getlocation_die (Dwarf_Attribute *attr,
     809                 :            :                                   const Dwarf_Op *op,
     810                 :            :                                   Dwarf_Die *result)
     811                 :            :   __nonnull_attribute__ (2, 3);
     812                 :            : 
     813                 :            : /* Return the attribute expressing a value associated with an operation such
     814                 :            :    as DW_OP_implicit_value, DW_OP_GNU_entry_value or DW_OP_GNU_const_type.
     815                 :            :    The OP pointer must point into an expression that dwarf_getlocation
     816                 :            :    or dwarf_getlocation_addr has returned given the same ATTR.
     817                 :            :    The RESULT is a value expressed by an attribute such as DW_AT_location
     818                 :            :    or DW_AT_const_value.  */
     819                 :            : extern int dwarf_getlocation_attr (Dwarf_Attribute *attr,
     820                 :            :                                    const Dwarf_Op *op,
     821                 :            :                                    Dwarf_Attribute *result)
     822                 :            :   __nonnull_attribute__ (2, 3);
     823                 :            : 
     824                 :            : 
     825                 :            : /* Compute the byte-size of a type DIE according to DWARF rules.
     826                 :            :    For most types, this is just DW_AT_byte_size.
     827                 :            :    For DW_TAG_array_type it can apply much more complex rules.  */
     828                 :            : extern int dwarf_aggregate_size (Dwarf_Die *die, Dwarf_Word *size);
     829                 :            : 
     830                 :            : /* Given a language code, as returned by dwarf_srclan, get the default
     831                 :            :    lower bound for a subrange type without a lower bound attribute.
     832                 :            :    Returns zero on success or -1 on failure when the given language
     833                 :            :    wasn't recognized.  */
     834                 :            : extern int dwarf_default_lower_bound (int lang, Dwarf_Sword *result)
     835                 :            :   __nonnull_attribute__ (2);
     836                 :            : 
     837                 :            : /* Return scope DIEs containing PC address.
     838                 :            :    Sets *SCOPES to a malloc'd array of Dwarf_Die structures,
     839                 :            :    and returns the number of elements in the array.
     840                 :            :    (*SCOPES)[0] is the DIE for the innermost scope containing PC,
     841                 :            :    (*SCOPES)[1] is the DIE for the scope containing that scope, and so on.
     842                 :            :    Returns -1 for errors or 0 if no scopes match PC.  */
     843                 :            : extern int dwarf_getscopes (Dwarf_Die *cudie, Dwarf_Addr pc,
     844                 :            :                             Dwarf_Die **scopes);
     845                 :            : 
     846                 :            : /* Return scope DIEs containing the given DIE.
     847                 :            :    Sets *SCOPES to a malloc'd array of Dwarf_Die structures,
     848                 :            :    and returns the number of elements in the array.
     849                 :            :    (*SCOPES)[0] is a copy of DIE.
     850                 :            :    (*SCOPES)[1] is the DIE for the scope containing that scope, and so on.
     851                 :            :    Returns -1 for errors or 0 if DIE is not found in any scope entry.  */
     852                 :            : extern int dwarf_getscopes_die (Dwarf_Die *die, Dwarf_Die **scopes);
     853                 :            : 
     854                 :            : 
     855                 :            : /* Search SCOPES[0..NSCOPES-1] for a variable called NAME.
     856                 :            :    Ignore the first SKIP_SHADOWS scopes that match the name.
     857                 :            :    If MATCH_FILE is not null, accept only declaration in that source file;
     858                 :            :    if MATCH_LINENO or MATCH_LINECOL are also nonzero, accept only declaration
     859                 :            :    at that line and column.
     860                 :            : 
     861                 :            :    If successful, fill in *RESULT with the DIE of the variable found,
     862                 :            :    and return N where SCOPES[N] is the scope defining the variable.
     863                 :            :    Return -1 for errors or -2 for no matching variable found.  */
     864                 :            : extern int dwarf_getscopevar (Dwarf_Die *scopes, int nscopes,
     865                 :            :                               const char *name, int skip_shadows,
     866                 :            :                               const char *match_file,
     867                 :            :                               int match_lineno, int match_linecol,
     868                 :            :                               Dwarf_Die *result);
     869                 :            : 
     870                 :            : 
     871                 :            : 
     872                 :            : /* Return list address ranges.  */
     873                 :            : extern int dwarf_getaranges (Dwarf *dbg, Dwarf_Aranges **aranges,
     874                 :            :                              size_t *naranges)
     875                 :            :      __nonnull_attribute__ (2);
     876                 :            : 
     877                 :            : /* Return one of the address range entries.  */
     878                 :            : extern Dwarf_Arange *dwarf_onearange (Dwarf_Aranges *aranges, size_t idx);
     879                 :            : 
     880                 :            : /* Return information in address range record.  */
     881                 :            : extern int dwarf_getarangeinfo (Dwarf_Arange *arange, Dwarf_Addr *addrp,
     882                 :            :                                 Dwarf_Word *lengthp, Dwarf_Off *offsetp);
     883                 :            : 
     884                 :            : /* Get address range which includes given address.  */
     885                 :            : extern Dwarf_Arange *dwarf_getarange_addr (Dwarf_Aranges *aranges,
     886                 :            :                                            Dwarf_Addr addr);
     887                 :            : 
     888                 :            : 
     889                 :            : 
     890                 :            : /* Get functions in CUDIE.  The given callback will be called for all
     891                 :            :    defining DW_TAG_subprograms in the CU DIE tree.  If the callback
     892                 :            :    returns DWARF_CB_ABORT the return value can be used as offset argument
     893                 :            :    to resume the function to find all remaining functions (this is not
     894                 :            :    really recommended, since it needs to rewalk the CU DIE tree first till
     895                 :            :    that offset is found again).  If the callback returns DWARF_CB_OK
     896                 :            :    dwarf_getfuncs will not return but keep calling the callback for each
     897                 :            :    function DIE it finds.  Pass zero for offset on the first call to walk
     898                 :            :    the full CU DIE tree.  If no more functions can be found and the callback
     899                 :            :    returned DWARF_CB_OK then the function returns zero.  */
     900                 :            : extern ptrdiff_t dwarf_getfuncs (Dwarf_Die *cudie,
     901                 :            :                                  int (*callback) (Dwarf_Die *, void *),
     902                 :            :                                  void *arg, ptrdiff_t offset);
     903                 :            : 
     904                 :            : 
     905                 :            : /* Return file name containing definition of the given declaration.
     906                 :            :    Of the DECL has an (indirect, see dwarf_attr_integrate) decl_file
     907                 :            :    attribute.  The returned file path is either absolute, or relative
     908                 :            :    to the compilation directory.  Given the decl DIE, the compilation
     909                 :            :    directory can be retrieved through:
     910                 :            :    dwarf_formstring (dwarf_attr (dwarf_diecu (decl, &cudie, NULL, NULL),
     911                 :            :                                  DW_AT_comp_dir, &attr));
     912                 :            :    Returns NULL if no decl_file could be found or an error occurred.  */
     913                 :            : extern const char *dwarf_decl_file (Dwarf_Die *decl);
     914                 :            : 
     915                 :            : /* Get line number of beginning of given declaration.  */
     916                 :            : extern int dwarf_decl_line (Dwarf_Die *decl, int *linep)
     917                 :            :      __nonnull_attribute__ (2);
     918                 :            : 
     919                 :            : /* Get column number of beginning of given declaration.  */
     920                 :            : extern int dwarf_decl_column (Dwarf_Die *decl, int *colp)
     921                 :            :      __nonnull_attribute__ (2);
     922                 :            : 
     923                 :            : 
     924                 :            : /* Return nonzero if given function is an abstract inline definition.  */
     925                 :            : extern int dwarf_func_inline (Dwarf_Die *func);
     926                 :            : 
     927                 :            : /* Find each concrete inlined instance of the abstract inline definition.  */
     928                 :            : extern int dwarf_func_inline_instances (Dwarf_Die *func,
     929                 :            :                                         int (*callback) (Dwarf_Die *, void *),
     930                 :            :                                         void *arg);
     931                 :            : 
     932                 :            : 
     933                 :            : /* Find the appropriate PC location or locations for function entry
     934                 :            :    breakpoints for the given DW_TAG_subprogram DIE.  Returns -1 for errors.
     935                 :            :    On success, returns the number of breakpoint locations (never zero)
     936                 :            :    and sets *BKPTS to a malloc'd vector of addresses.  */
     937                 :            : extern int dwarf_entry_breakpoints (Dwarf_Die *die, Dwarf_Addr **bkpts);
     938                 :            : 
     939                 :            : 
     940                 :            : /* Iterate through the macro unit referenced by CUDIE and call
     941                 :            :    CALLBACK for each macro information entry.  To start the iteration,
     942                 :            :    one would pass DWARF_GETMACROS_START for TOKEN.
     943                 :            : 
     944                 :            :    The iteration continues while CALLBACK returns DWARF_CB_OK.  If the
     945                 :            :    callback returns DWARF_CB_ABORT, the iteration stops and a
     946                 :            :    continuation token is returned, which can be used to restart the
     947                 :            :    iteration at the point where it ended.  Returns -1 for errors or 0
     948                 :            :    if there are no more macro entries.
     949                 :            : 
     950                 :            :    Note that the Dwarf_Macro pointer passed to the callback is only
     951                 :            :    valid for the duration of the callback invocation.
     952                 :            : 
     953                 :            :    For backward compatibility, a token of 0 is accepted for starting
     954                 :            :    the iteration as well, but in that case this interface will refuse
     955                 :            :    to serve opcode 0xff from .debug_macro sections.  Such opcode would
     956                 :            :    be considered invalid and would cause dwarf_getmacros to return
     957                 :            :    with error.  */
     958                 :            : #define DWARF_GETMACROS_START PTRDIFF_MIN
     959                 :            : extern ptrdiff_t dwarf_getmacros (Dwarf_Die *cudie,
     960                 :            :                                   int (*callback) (Dwarf_Macro *, void *),
     961                 :            :                                   void *arg, ptrdiff_t token)
     962                 :            :      __nonnull_attribute__ (2);
     963                 :            : 
     964                 :            : /* This is similar in operation to dwarf_getmacros, but selects the
     965                 :            :    unit to iterate through by offset instead of by CU, and always
     966                 :            :    iterates .debug_macro.  This can be used for handling
     967                 :            :    DW_MACRO_GNU_transparent_include's or similar opcodes.
     968                 :            : 
     969                 :            :    TOKEN value of DWARF_GETMACROS_START can be used to start the
     970                 :            :    iteration.
     971                 :            : 
     972                 :            :    It is not appropriate to obtain macro unit offset by hand from a CU
     973                 :            :    DIE and then request iteration through this interface.  The reason
     974                 :            :    for this is that if a dwarf_macro_getsrcfiles is later called,
     975                 :            :    there would be no way to figure out what DW_AT_comp_dir was present
     976                 :            :    on the CU DIE, and file names referenced in either the macro unit
     977                 :            :    itself, or the .debug_line unit that it references, might be wrong.
     978                 :            :    Use dwarf_getmacros.  */
     979                 :            : extern ptrdiff_t dwarf_getmacros_off (Dwarf *dbg, Dwarf_Off macoff,
     980                 :            :                                       int (*callback) (Dwarf_Macro *, void *),
     981                 :            :                                       void *arg, ptrdiff_t token)
     982                 :            :   __nonnull_attribute__ (3);
     983                 :            : 
     984                 :            : /* Get the source files used by the macro entry.  You shouldn't assume
     985                 :            :    that Dwarf_Files references will remain valid after MACRO becomes
     986                 :            :    invalid.  (Which is to say it's only valid within the
     987                 :            :    dwarf_getmacros* callback.)  Returns 0 for success or a negative
     988                 :            :    value in case of an error.  */
     989                 :            : extern int dwarf_macro_getsrcfiles (Dwarf *dbg, Dwarf_Macro *macro,
     990                 :            :                                     Dwarf_Files **files, size_t *nfiles)
     991                 :            :   __nonnull_attribute__ (2, 3, 4);
     992                 :            : 
     993                 :            : /* Return macro opcode.  That's a constant that can be either from
     994                 :            :    DW_MACINFO_* domain or DW_MACRO_GNU_* domain.  The two domains have
     995                 :            :    compatible values, so it's OK to use either of them for
     996                 :            :    comparisons.  The only differences is 0xff, which could be either
     997                 :            :    DW_MACINFO_vendor_ext or a vendor-defined DW_MACRO_* constant.  One
     998                 :            :    would need to look if the CU DIE which the iteration was requested
     999                 :            :    for has attribute DW_AT_macro_info, or either of DW_AT_GNU_macros
    1000                 :            :    or DW_AT_macros to differentiate the two interpretations.  */
    1001                 :            : extern int dwarf_macro_opcode (Dwarf_Macro *macro, unsigned int *opcodep)
    1002                 :            :      __nonnull_attribute__ (2);
    1003                 :            : 
    1004                 :            : /* Get number of parameters of MACRO and store it to *PARAMCNTP.  */
    1005                 :            : extern int dwarf_macro_getparamcnt (Dwarf_Macro *macro, size_t *paramcntp);
    1006                 :            : 
    1007                 :            : /* Get IDX-th parameter of MACRO (numbered from zero), and stores it
    1008                 :            :    to *ATTRIBUTE.  Returns 0 on success or -1 for errors.
    1009                 :            : 
    1010                 :            :    After a successful call, you can query ATTRIBUTE by dwarf_whatform
    1011                 :            :    to determine which of the dwarf_formX calls to make to get actual
    1012                 :            :    value out of ATTRIBUTE.  Note that calling dwarf_whatattr is not
    1013                 :            :    meaningful for pseudo-attributes formed this way.  */
    1014                 :            : extern int dwarf_macro_param (Dwarf_Macro *macro, size_t idx,
    1015                 :            :                               Dwarf_Attribute *attribute);
    1016                 :            : 
    1017                 :            : /* Return macro parameter with index 0.  This will return -1 if the
    1018                 :            :    parameter is not an integral value.  Use dwarf_macro_param for more
    1019                 :            :    general access.  */
    1020                 :            : extern int dwarf_macro_param1 (Dwarf_Macro *macro, Dwarf_Word *paramp)
    1021                 :            :      __nonnull_attribute__ (2);
    1022                 :            : 
    1023                 :            : /* Return macro parameter with index 1.  This will return -1 if the
    1024                 :            :    parameter is not an integral or string value.  Use
    1025                 :            :    dwarf_macro_param for more general access.  */
    1026                 :            : extern int dwarf_macro_param2 (Dwarf_Macro *macro, Dwarf_Word *paramp,
    1027                 :            :                                const char **strp);
    1028                 :            : 
    1029                 :            : /* Compute what's known about a call frame when the PC is at ADDRESS.
    1030                 :            :    Returns 0 for success or -1 for errors.
    1031                 :            :    On success, *FRAME is a malloc'd pointer.  */
    1032                 :            : extern int dwarf_cfi_addrframe (Dwarf_CFI *cache,
    1033                 :            :                                 Dwarf_Addr address, Dwarf_Frame **frame)
    1034                 :            :   __nonnull_attribute__ (3);
    1035                 :            : 
    1036                 :            : /* Return the DWARF register number used in FRAME to denote
    1037                 :            :    the return address in FRAME's caller frame.  The remaining
    1038                 :            :    arguments can be non-null to fill in more information.
    1039                 :            : 
    1040                 :            :    Fill [*START, *END) with the PC range to which FRAME's information applies.
    1041                 :            :    Fill in *SIGNALP to indicate whether this is a signal-handling frame.
    1042                 :            :    If true, this is the implicit call frame that calls a signal handler.
    1043                 :            :    This frame's "caller" is actually the interrupted state, not a call;
    1044                 :            :    its return address is an exact PC, not a PC after a call instruction.  */
    1045                 :            : extern int dwarf_frame_info (Dwarf_Frame *frame,
    1046                 :            :                              Dwarf_Addr *start, Dwarf_Addr *end, bool *signalp);
    1047                 :            : 
    1048                 :            : /* Return a DWARF expression that yields the Canonical Frame Address at
    1049                 :            :    this frame state.  Returns -1 for errors, or zero for success, with
    1050                 :            :    *NOPS set to the number of operations stored at *OPS.  That pointer
    1051                 :            :    can be used only as long as FRAME is alive and unchanged.  *NOPS is
    1052                 :            :    zero if the CFA cannot be determined here.  Note that if nonempty,
    1053                 :            :    *OPS is a DWARF expression, not a location description--append
    1054                 :            :    DW_OP_stack_value to a get a location description for the CFA.  */
    1055                 :            : extern int dwarf_frame_cfa (Dwarf_Frame *frame, Dwarf_Op **ops, size_t *nops)
    1056                 :            :   __nonnull_attribute__ (2);
    1057                 :            : 
    1058                 :            : /* Deliver a DWARF location description that yields the location or
    1059                 :            :    value of DWARF register number REGNO in the state described by FRAME.
    1060                 :            : 
    1061                 :            :    Returns -1 for errors or zero for success, setting *NOPS to the
    1062                 :            :    number of operations in the array stored at *OPS.  Note the last
    1063                 :            :    operation is DW_OP_stack_value if there is no mutable location but
    1064                 :            :    only a computable value.
    1065                 :            : 
    1066                 :            :    *NOPS zero with *OPS set to OPS_MEM means CFI says the caller's
    1067                 :            :    REGNO is "undefined", i.e. it's call-clobbered and cannot be recovered.
    1068                 :            : 
    1069                 :            :    *NOPS zero with *OPS set to a null pointer means CFI says the
    1070                 :            :    caller's REGNO is "same_value", i.e. this frame did not change it;
    1071                 :            :    ask the caller frame where to find it.
    1072                 :            : 
    1073                 :            :    For common simple expressions *OPS is OPS_MEM (which is a caller
    1074                 :            :    owned array for at least 3 Dwarf_Ops).  For arbitrary DWARF
    1075                 :            :    expressions in the CFI, *OPS is an internal pointer that can be
    1076                 :            :    used as long as the Dwarf_CFI used to create FRAME remains
    1077                 :            :    alive.  */
    1078                 :            : extern int dwarf_frame_register (Dwarf_Frame *frame, int regno,
    1079                 :            :                                  Dwarf_Op ops_mem[3],
    1080                 :            :                                  Dwarf_Op **ops, size_t *nops)
    1081                 :            :   __nonnull_attribute__ (3, 4, 5);
    1082                 :            : 
    1083                 :            : 
    1084                 :            : /* Return error code of last failing function call.  This value is kept
    1085                 :            :    separately for each thread.  */
    1086                 :            : extern int dwarf_errno (void);
    1087                 :            : 
    1088                 :            : /* Return error string for ERROR.  If ERROR is zero, return error string
    1089                 :            :    for most recent error or NULL is none occurred.  If ERROR is -1 the
    1090                 :            :    behaviour is similar to the last case except that not NULL but a legal
    1091                 :            :    string is returned.  */
    1092                 :            : extern const char *dwarf_errmsg (int err);
    1093                 :            : 
    1094                 :            : 
    1095                 :            : /* Register new Out-Of-Memory handler.  The old handler is returned.  */
    1096                 :            : extern Dwarf_OOM dwarf_new_oom_handler (Dwarf *dbg, Dwarf_OOM handler);
    1097                 :            : 
    1098                 :            : 
    1099                 :            : /* Inline optimizations.  */
    1100                 :            : #ifdef __OPTIMIZE__
    1101                 :            : /* Return attribute code of given attribute.  */
    1102                 :            : __libdw_extern_inline unsigned int
    1103                 :    3730867 : dwarf_whatattr (Dwarf_Attribute *attr)
    1104                 :            : {
    1105         [ +  - ]:    3730867 :   return attr == NULL ? 0 : attr->code;
    1106                 :            : }
    1107                 :            : 
    1108                 :            : /* Return attribute code of given attribute.  */
    1109                 :            : __libdw_extern_inline unsigned int
    1110                 :    9036862 : dwarf_whatform (Dwarf_Attribute *attr)
    1111                 :            : {
    1112         [ +  + ]:    9036862 :   return attr == NULL ? 0 : attr->form;
    1113                 :            : }
    1114                 :            : #endif  /* Optimize.  */
    1115                 :            : 
    1116                 :            : #ifdef __cplusplus
    1117                 :            : }
    1118                 :            : #endif
    1119                 :            : 
    1120                 :            : #endif  /* libdw.h */

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