include/ctf-api.h

   1 /* Public API to libctf.
   2    Copyright (C) 2019 Free Software Foundation, Inc.
   3
   4    This file is part of libctf.
   5
   6    libctf is free software; you can redistribute it and/or modify it under
   7    the terms of the GNU General Public License as published by the Free
   8    Software Foundation; either version 3, or (at your option) any later
   9    version.
  10
  11    This program is distributed in the hope that it will be useful, but
  12    WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  14    See the GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; see the file COPYING.  If not see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 /* This header file defines the interfaces available from the CTF debugger
  21    library, libctf.  This API can be used by a debugger to operate on data in
  22    the Compact ANSI-C Type Format (CTF).  */
  23
  24 #ifndef _CTF_API_H
  25 #define _CTF_API_H
  26
  27 #include <sys/param.h>
  28 #include <sys/types.h>
  29 #include <ctf.h>
  30 #include <zlib.h>
  31
  32 #ifdef  __cplusplus
  33 extern "C"
  34   {
  35 #endif
  36
  37 /* Clients can open one or more CTF containers and obtain a pointer to an
  38    opaque ctf_file_t.  Types are identified by an opaque ctf_id_t token.
  39    They can also open or create read-only archives of CTF containers in a
  40    ctf_archive_t.
  41
  42    These opaque definitions allow libctf to evolve without breaking clients.  */
  43
  44 typedef struct ctf_file ctf_file_t;
  45 typedef struct ctf_archive_internal ctf_archive_t;
  46 typedef long ctf_id_t;
  47
  48 /* This opaque definition allows libctf to accept BFD data structures without
  49    importing all the BFD noise into users' namespaces.  */
  50
  51 struct bfd;
  52
  53 /* If the debugger needs to provide the CTF library with a set of raw buffers
  54    for use as the CTF data, symbol table, and string table, it can do so by
  55    filling in ctf_sect_t structures and passing them to ctf_bufopen().
  56
  57    The contents of this structure must always be in native endianness (no
  58    byteswapping is performed).  */
  59
  60 typedef struct ctf_sect
  61 {
  62   const char *cts_name;           /* Section name (if any).  */
  63   unsigned long cts_type;         /* Section type (ELF SHT_... value).  */
  64   unsigned long cts_flags;        /* Section flags (ELF SHF_... value).  */
  65   const void *cts_data;           /* Pointer to section data.  */
  66   size_t cts_size;                /* Size of data in bytes.  */
  67   size_t cts_entsize;             /* Size of each section entry (symtab only).  */
  68   off64_t cts_offset;             /* File offset of this section (if any).  */
  69 } ctf_sect_t;
  70
  71 /* Symbolic names for CTF sections.  */
  72
  73 typedef enum ctf_sect_names
  74   {
  75    CTF_SECT_HEADER,
  76    CTF_SECT_LABEL,
  77    CTF_SECT_OBJT,
  78    CTF_SECT_FUNC,
  79    CTF_SECT_VAR,
  80    CTF_SECT_TYPE,
  81    CTF_SECT_STR
  82   } ctf_sect_names_t;
  83
  84 /* Encoding information for integers, floating-point values, and certain other
  85    intrinsics can be obtained by calling ctf_type_encoding(), below.  The flags
  86    field will contain values appropriate for the type defined in <ctf.h>.  */
  87
  88 typedef struct ctf_encoding
  89 {
  90   uint32_t cte_format;           /* Data format (CTF_INT_* or CTF_FP_* flags).  */
  91   uint32_t cte_offset;           /* Offset of value in bits.  */
  92   uint32_t cte_bits;             /* Size of storage in bits.  */
  93 } ctf_encoding_t;
  94
  95 typedef struct ctf_membinfo
  96 {
  97   ctf_id_t ctm_type;            /* Type of struct or union member.  */
  98   unsigned long ctm_offset;     /* Offset of member in bits.  */
  99 } ctf_membinfo_t;
 100
 101 typedef struct ctf_arinfo
 102 {
 103   ctf_id_t ctr_contents;        /* Type of array contents.  */
 104   ctf_id_t ctr_index;           /* Type of array index.  */
 105   uint32_t ctr_nelems;          /* Number of elements.  */
 106 } ctf_arinfo_t;
 107
 108 typedef struct ctf_funcinfo
 109 {
 110   ctf_id_t ctc_return;          /* Function return type.  */
 111   uint32_t ctc_argc;            /* Number of typed arguments to function.  */
 112   uint32_t ctc_flags;           /* Function attributes (see below).  */
 113 } ctf_funcinfo_t;
 114
 115 typedef struct ctf_lblinfo
 116 {
 117   ctf_id_t ctb_type;            /* Last type associated with the label.  */
 118 } ctf_lblinfo_t;
 119
 120 typedef struct ctf_snapshot_id
 121 {
 122   unsigned long dtd_id;         /* Highest DTD ID at time of snapshot.  */
 123   unsigned long snapshot_id;    /* Snapshot id at time of snapshot.  */
 124 } ctf_snapshot_id_t;
 125
 126 #define CTF_FUNC_VARARG 0x1     /* Function arguments end with varargs.  */
 127
 128 /* Functions that return integer status or a ctf_id_t use the following value
 129    to indicate failure.  ctf_errno() can be used to obtain an error code.  */
 130 #define CTF_ERR (-1L)
 131
 132 #define ECTF_BASE       1000    /* Base value for libctf errnos.  */
 133
 134
 135 enum
 136   {
 137    ECTF_FMT = ECTF_BASE,        /* File is not in CTF or ELF format.  */
 138    ECTF_BFDERR,                 /* BFD error.  */
 139    ECTF_CTFVERS,                /* CTF version is more recent than libctf.  */
 140    ECTF_BFD_AMBIGUOUS,          /* Ambiguous BFD target.  */
 141    ECTF_SYMTAB,                 /* Symbol table uses invalid entry size.  */
 142    ECTF_SYMBAD,                 /* Symbol table data buffer invalid.  */
 143    ECTF_STRBAD,                 /* String table data buffer invalid.  */
 144    ECTF_CORRUPT,                /* File data corruption detected.  */
 145    ECTF_NOCTFDATA,              /* ELF file does not contain CTF data.  */
 146    ECTF_NOCTFBUF,               /* Buffer does not contain CTF data.  */
 147    ECTF_NOSYMTAB,               /* Symbol table data is not available.  */
 148    ECTF_NOPARENT,               /* Parent CTF container is not available.  */
 149    ECTF_DMODEL,                 /* Data model mismatch.  */
 150    ECTF_UNUSED,                 /* Unused error.  */
 151    ECTF_ZALLOC,                 /* Failed to allocate (de)compression buffer.  */
 152    ECTF_DECOMPRESS,             /* Failed to decompress CTF data.  */
 153    ECTF_STRTAB,                 /* String table for this string is missing.  */
 154    ECTF_BADNAME,                /* String offset is corrupt w.r.t. strtab.  */
 155    ECTF_BADID,                  /* Invalid type ID number.  */
 156    ECTF_NOTSOU,                 /* Type is not a struct or union.  */
 157    ECTF_NOTENUM,                /* Type is not an enum.  */
 158    ECTF_NOTSUE,                 /* Type is not a struct, union, or enum.  */
 159    ECTF_NOTINTFP,               /* Type is not an integer, float, or enum.  */
 160    ECTF_NOTARRAY,               /* Type is not an array.  */
 161    ECTF_NOTREF,                 /* Type does not reference another type.  */
 162    ECTF_NAMELEN,                /* Buffer is too small to hold type name.  */
 163    ECTF_NOTYPE,                 /* No type found corresponding to name.  */
 164    ECTF_SYNTAX,                 /* Syntax error in type name.  */
 165    ECTF_NOTFUNC,                /* Symtab entry does not refer to a function.  */
 166    ECTF_NOFUNCDAT,              /* No func info available for function.  */
 167    ECTF_NOTDATA,                /* Symtab entry does not refer to a data obj.  */
 168    ECTF_NOTYPEDAT,              /* No type info available for object.  */
 169    ECTF_NOLABEL,                /* No label found corresponding to name.  */
 170    ECTF_NOLABELDATA,            /* File does not contain any labels.  */
 171    ECTF_NOTSUP,                 /* Feature not supported.  */
 172    ECTF_NOENUMNAM,              /* Enum element name not found.  */
 173    ECTF_NOMEMBNAM,              /* Member name not found.  */
 174    ECTF_RDONLY,                 /* CTF container is read-only.  */
 175    ECTF_DTFULL,                 /* CTF type is full (no more members allowed).  */
 176    ECTF_FULL,                   /* CTF container is full.  */
 177    ECTF_DUPLICATE,              /* Duplicate member or variable name.  */
 178    ECTF_CONFLICT,               /* Conflicting type definition present.  */
 179    ECTF_OVERROLLBACK,           /* Attempt to roll back past a ctf_update.  */
 180    ECTF_COMPRESS,               /* Failed to compress CTF data.  */
 181    ECTF_ARCREATE,               /* Error creating CTF archive.  */
 182    ECTF_ARNNAME,                /* Name not found in CTF archive.  */
 183    ECTF_SLICEOVERFLOW,          /* Overflow of type bitness or offset in slice.  */
 184    ECTF_DUMPSECTUNKNOWN,        /* Unknown section number in dump.  */
 185    ECTF_DUMPSECTCHANGED         /* Section changed in middle of dump.  */
 186   };
 187
 188 /* The CTF data model is inferred to be the caller's data model or the data
 189    model of the given object, unless ctf_setmodel() is explicitly called.  */
 190 #define CTF_MODEL_ILP32 1       /* Object data model is ILP32.  */
 191 #define CTF_MODEL_LP64  2       /* Object data model is LP64.  */
 192 #ifdef _LP64
 193 # define CTF_MODEL_NATIVE CTF_MODEL_LP64
 194 #else
 195 # define CTF_MODEL_NATIVE CTF_MODEL_ILP32
 196 #endif
 197
 198 /* Dynamic CTF containers can be created using ctf_create().  The ctf_add_*
 199    routines can be used to add new definitions to the dynamic container.
 200    New types are labeled as root or non-root to determine whether they are
 201    visible at the top-level program scope when subsequently doing a lookup.  */
 202
 203 #define CTF_ADD_NONROOT 0       /* Type only visible in nested scope.  */
 204 #define CTF_ADD_ROOT    1       /* Type visible at top-level scope.  */
 205
 206 /* These typedefs are used to define the signature for callback functions
 207    that can be used with the iteration and visit functions below.  */
 208
 209 typedef int ctf_visit_f (const char *name, ctf_id_t type, unsigned long offset,
 210                          int depth, void *arg);
 211 typedef int ctf_member_f (const char *name, ctf_id_t membtype,
 212                           unsigned long offset, void *arg);
 213 typedef int ctf_enum_f (const char *name, int val, void *arg);
 214 typedef int ctf_variable_f (const char *name, ctf_id_t type, void *arg);
 215 typedef int ctf_type_f (ctf_id_t type, void *arg);
 216 typedef int ctf_archive_member_f (ctf_file_t *fp, const char *name, void *arg);
 217 typedef int ctf_archive_raw_member_f (const char *name, const void *content,
 218                                       size_t len, void *arg);
 219
 220 /* Opening.  These mostly return an abstraction over both CTF files and CTF
 221    archives: so they can be used to open both.  CTF files will appear to be an
 222    archive with one member named '.ctf'.  The low-level functions
 223    ctf_simple_open() and ctf_bufopen() return ctf_file_t's directly, and cannot
 224    be used on CTF archives.  */
 225
 226 extern ctf_archive_t *ctf_bfdopen (struct bfd *, int *);
 227 extern ctf_archive_t *ctf_bfdopen_ctfsect (struct bfd *, const ctf_sect_t *,
 228                                            int *);
 229 extern ctf_archive_t *ctf_fdopen (int fd, const char *filename,
 230                                   const char *target, int *errp);
 231 extern ctf_archive_t *ctf_open (const char *filename,
 232                                 const char *target, int *errp);
 233 extern void ctf_close (ctf_archive_t *);
 234 extern ctf_sect_t ctf_getdatasect (const ctf_file_t *);
 235 extern ctf_archive_t *ctf_get_arc (const ctf_file_t *);
 236 extern ctf_archive_t *ctf_arc_open (const char *, int *);
 237 extern void ctf_arc_close (ctf_archive_t *);
 238 extern ctf_file_t *ctf_arc_open_by_name (const ctf_archive_t *,
 239                                          const char *, int *);
 240 extern ctf_file_t *ctf_arc_open_by_name_sections (const ctf_archive_t *,
 241                                                   const ctf_sect_t *,
 242                                                   const ctf_sect_t *,
 243                                                   const char *, int *);
 244
 245 /* The next functions return or close real CTF files, or write out CTF archives,
 246    not opaque containers around either.  */
 247
 248 extern ctf_file_t *ctf_simple_open (const char *, size_t, const char *, size_t,
 249                                    size_t, const char *, size_t, int *);
 250 extern ctf_file_t *ctf_bufopen (const ctf_sect_t *, const ctf_sect_t *,
 251                                 const ctf_sect_t *, int *);
 252 extern void ctf_file_close (ctf_file_t *);
 253
 254 extern int ctf_arc_write (const char *, ctf_file_t **, size_t,
 255                           const char **, size_t);
 256
 257 extern ctf_file_t *ctf_parent_file (ctf_file_t *);
 258 extern const char *ctf_parent_name (ctf_file_t *);
 259 extern void ctf_parent_name_set (ctf_file_t *, const char *);
 260 extern int ctf_type_isparent (ctf_file_t *, ctf_id_t);
 261 extern int ctf_type_ischild (ctf_file_t *, ctf_id_t);
 262
 263 extern int ctf_import (ctf_file_t *, ctf_file_t *);
 264 extern int ctf_setmodel (ctf_file_t *, int);
 265 extern int ctf_getmodel (ctf_file_t *);
 266
 267 extern void ctf_setspecific (ctf_file_t *, void *);
 268 extern void *ctf_getspecific (ctf_file_t *);
 269
 270 extern int ctf_errno (ctf_file_t *);
 271 extern const char *ctf_errmsg (int);
 272
 273 extern ctf_id_t ctf_type_resolve (ctf_file_t *, ctf_id_t);
 274 extern char *ctf_type_aname (ctf_file_t *, ctf_id_t);
 275 extern ssize_t ctf_type_lname (ctf_file_t *, ctf_id_t, char *, size_t);
 276 extern char *ctf_type_name (ctf_file_t *, ctf_id_t, char *, size_t);
 277 extern ssize_t ctf_type_size (ctf_file_t *, ctf_id_t);
 278 extern ssize_t ctf_type_align (ctf_file_t *, ctf_id_t);
 279 extern int ctf_type_kind (ctf_file_t *, ctf_id_t);
 280 extern ctf_id_t ctf_type_reference (ctf_file_t *, ctf_id_t);
 281 extern ctf_id_t ctf_type_pointer (ctf_file_t *, ctf_id_t);
 282 extern int ctf_type_encoding (ctf_file_t *, ctf_id_t, ctf_encoding_t *);
 283 extern int ctf_type_visit (ctf_file_t *, ctf_id_t, ctf_visit_f *, void *);
 284 extern int ctf_type_cmp (ctf_file_t *, ctf_id_t, ctf_file_t *, ctf_id_t);
 285 extern int ctf_type_compat (ctf_file_t *, ctf_id_t, ctf_file_t *, ctf_id_t);
 286
 287 extern int ctf_member_info (ctf_file_t *, ctf_id_t, const char *,
 288                             ctf_membinfo_t *);
 289 extern int ctf_array_info (ctf_file_t *, ctf_id_t, ctf_arinfo_t *);
 290
 291 extern const char *ctf_enum_name (ctf_file_t *, ctf_id_t, int);
 292 extern int ctf_enum_value (ctf_file_t *, ctf_id_t, const char *, int *);
 293
 294 extern int ctf_member_iter (ctf_file_t *, ctf_id_t, ctf_member_f *, void *);
 295 extern int ctf_enum_iter (ctf_file_t *, ctf_id_t, ctf_enum_f *, void *);
 296 extern int ctf_type_iter (ctf_file_t *, ctf_type_f *, void *);
 297 extern int ctf_variable_iter (ctf_file_t *, ctf_variable_f *, void *);
 298 extern int ctf_archive_iter (const ctf_archive_t *, ctf_archive_member_f *,
 299                              void *);
 300 /* This function alone does not currently operate on CTF files masquerading
 301    as archives, and returns -EINVAL: the raw data is no longer available.  It is
 302    expected to be used only by archiving tools, in any case, which have no need
 303    to deal with non-archives at all.  */
 304 extern int ctf_archive_raw_iter (const ctf_archive_t *,
 305                                  ctf_archive_raw_member_f *, void *);
 306
 307 extern ctf_id_t ctf_add_array (ctf_file_t *, uint32_t,
 308                                const ctf_arinfo_t *);
 309 extern ctf_id_t ctf_add_const (ctf_file_t *, uint32_t, ctf_id_t);
 310 extern ctf_id_t ctf_add_enum_encoded (ctf_file_t *, uint32_t, const char *,
 311                                       const ctf_encoding_t *);
 312 extern ctf_id_t ctf_add_enum (ctf_file_t *, uint32_t, const char *);
 313 extern ctf_id_t ctf_add_float (ctf_file_t *, uint32_t,
 314                                const char *, const ctf_encoding_t *);
 315 extern ctf_id_t ctf_add_forward (ctf_file_t *, uint32_t, const char *,
 316                                  uint32_t);
 317 extern ctf_id_t ctf_add_function (ctf_file_t *, uint32_t,
 318                                   const ctf_funcinfo_t *, const ctf_id_t *);
 319 extern ctf_id_t ctf_add_integer (ctf_file_t *, uint32_t, const char *,
 320                                  const ctf_encoding_t *);
 321 extern ctf_id_t ctf_add_slice (ctf_file_t *, uint32_t, ctf_id_t, const ctf_encoding_t *);
 322 extern ctf_id_t ctf_add_pointer (ctf_file_t *, uint32_t, ctf_id_t);
 323 extern ctf_id_t ctf_add_type (ctf_file_t *, ctf_file_t *, ctf_id_t);
 324 extern ctf_id_t ctf_add_typedef (ctf_file_t *, uint32_t, const char *,
 325                                  ctf_id_t);
 326 extern ctf_id_t ctf_add_restrict (ctf_file_t *, uint32_t, ctf_id_t);
 327 extern ctf_id_t ctf_add_struct (ctf_file_t *, uint32_t, const char *);
 328 extern ctf_id_t ctf_add_union (ctf_file_t *, uint32_t, const char *);
 329 extern ctf_id_t ctf_add_struct_sized (ctf_file_t *, uint32_t, const char *,
 330                                       size_t);
 331 extern ctf_id_t ctf_add_union_sized (ctf_file_t *, uint32_t, const char *,
 332                                      size_t);
 333 extern ctf_id_t ctf_add_volatile (ctf_file_t *, uint32_t, ctf_id_t);
 334
 335 extern int ctf_add_enumerator (ctf_file_t *, ctf_id_t, const char *, int);
 336 extern int ctf_add_member (ctf_file_t *, ctf_id_t, const char *, ctf_id_t);
 337 extern int ctf_add_member_offset (ctf_file_t *, ctf_id_t, const char *,
 338                                   ctf_id_t, unsigned long);
 339 extern int ctf_add_member_encoded (ctf_file_t *, ctf_id_t, const char *,
 340                                    ctf_id_t, unsigned long,
 341                                    const ctf_encoding_t);
 342
 343 extern int ctf_add_variable (ctf_file_t *, const char *, ctf_id_t);
 344
 345 extern int ctf_set_array (ctf_file_t *, ctf_id_t, const ctf_arinfo_t *);
 346
 347 extern ctf_file_t *ctf_create (int *);
 348 extern int ctf_update (ctf_file_t *);
 349 extern ctf_snapshot_id_t ctf_snapshot (ctf_file_t *);
 350 extern int ctf_rollback (ctf_file_t *, ctf_snapshot_id_t);
 351 extern int ctf_discard (ctf_file_t *);
 352 extern int ctf_write (ctf_file_t *, int);
 353 extern int ctf_gzwrite (ctf_file_t * fp, gzFile fd);
 354 extern int ctf_compress_write (ctf_file_t * fp, int fd);
 355
 356 extern void ctf_setdebug (int debug);
 357 extern int ctf_getdebug (void);
 358
 359 #ifdef  __cplusplus
 360 }
 361 #endif
 362
 363 #endif                          /* _CTF_API_H */