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 /* If the debugger needs to provide the CTF library with a set of raw buffers
  49    for use as the CTF data, symbol table, and string table, it can do so by
  50    filling in ctf_sect_t structures and passing them to ctf_bufopen().
  51
  52    The contents of this structure must always be in native endianness (no
  53    byteswapping is performed).  */
  54
  55 typedef struct ctf_sect
  56 {
  57   const char *cts_name;           /* Section name (if any).  */
  58   unsigned long cts_type;         /* Section type (ELF SHT_... value).  */
  59   unsigned long cts_flags;        /* Section flags (ELF SHF_... value).  */
  60   const void *cts_data;           /* Pointer to section data.  */
  61   size_t cts_size;                /* Size of data in bytes.  */
  62   size_t cts_entsize;             /* Size of each section entry (symtab only).  */
  63   off64_t cts_offset;             /* File offset of this section (if any).  */
  64 } ctf_sect_t;
  65
  66 /* Symbolic names for CTF sections.  */
  67
  68 typedef enum ctf_sect_names
  69   {
  70    CTF_SECT_HEADER,
  71    CTF_SECT_LABEL,
  72    CTF_SECT_OBJT,
  73    CTF_SECT_FUNC,
  74    CTF_SECT_VAR,
  75    CTF_SECT_TYPE,
  76    CTF_SECT_STR
  77   } ctf_sect_names_t;
  78
  79 /* Encoding information for integers, floating-point values, and certain other
  80    intrinsics can be obtained by calling ctf_type_encoding(), below.  The flags
  81    field will contain values appropriate for the type defined in <ctf.h>.  */
  82
  83 typedef struct ctf_encoding
  84 {
  85   uint32_t cte_format;           /* Data format (CTF_INT_* or CTF_FP_* flags).  */
  86   uint32_t cte_offset;           /* Offset of value in bits.  */
  87   uint32_t cte_bits;             /* Size of storage in bits.  */
  88 } ctf_encoding_t;
  89
  90 typedef struct ctf_membinfo
  91 {
  92   ctf_id_t ctm_type;            /* Type of struct or union member.  */
  93   unsigned long ctm_offset;     /* Offset of member in bits.  */
  94 } ctf_membinfo_t;
  95
  96 typedef struct ctf_arinfo
  97 {
  98   ctf_id_t ctr_contents;        /* Type of array contents.  */
  99   ctf_id_t ctr_index;           /* Type of array index.  */
 100   uint32_t ctr_nelems;          /* Number of elements.  */
 101 } ctf_arinfo_t;
 102
 103 typedef struct ctf_funcinfo
 104 {
 105   ctf_id_t ctc_return;          /* Function return type.  */
 106   uint32_t ctc_argc;            /* Number of typed arguments to function.  */
 107   uint32_t ctc_flags;           /* Function attributes (see below).  */
 108 } ctf_funcinfo_t;
 109
 110 typedef struct ctf_lblinfo
 111 {
 112   ctf_id_t ctb_type;            /* Last type associated with the label.  */
 113 } ctf_lblinfo_t;
 114
 115 typedef struct ctf_snapshot_id
 116 {
 117   unsigned long dtd_id;         /* Highest DTD ID at time of snapshot.  */
 118   unsigned long snapshot_id;    /* Snapshot id at time of snapshot.  */
 119 } ctf_snapshot_id_t;
 120
 121 #define CTF_FUNC_VARARG 0x1     /* Function arguments end with varargs.  */
 122
 123 /* Functions that return integer status or a ctf_id_t use the following value
 124    to indicate failure.  ctf_errno() can be used to obtain an error code.  */
 125 #define CTF_ERR (-1L)
 126
 127 #define ECTF_BASE       1000    /* Base value for libctf errnos.  */
 128
 129
 130 enum
 131   {
 132    ECTF_FMT = ECTF_BASE,        /* File is not in CTF or ELF format.  */
 133    ECTF_BFDERR,                 /* BFD error.  */
 134    ECTF_CTFVERS,                /* CTF version is more recent than libctf.  */
 135    ECTF_BFD_AMBIGUOUS,          /* Ambiguous BFD target.  */
 136    ECTF_SYMTAB,                 /* Symbol table uses invalid entry size.  */
 137    ECTF_SYMBAD,                 /* Symbol table data buffer invalid.  */
 138    ECTF_STRBAD,                 /* String table data buffer invalid.  */
 139    ECTF_CORRUPT,                /* File data corruption detected.  */
 140    ECTF_NOCTFDATA,              /* ELF file does not contain CTF data.  */
 141    ECTF_NOCTFBUF,               /* Buffer does not contain CTF data.  */
 142    ECTF_NOSYMTAB,               /* Symbol table data is not available.  */
 143    ECTF_NOPARENT,               /* Parent CTF container is not available.  */
 144    ECTF_DMODEL,                 /* Data model mismatch.  */
 145    ECTF_UNUSED,                 /* Unused error.  */
 146    ECTF_ZALLOC,                 /* Failed to allocate (de)compression buffer.  */
 147    ECTF_DECOMPRESS,             /* Failed to decompress CTF data.  */
 148    ECTF_STRTAB,                 /* String table for this string is missing.  */
 149    ECTF_BADNAME,                /* String offset is corrupt w.r.t. strtab.  */
 150    ECTF_BADID,                  /* Invalid type ID number.  */
 151    ECTF_NOTSOU,                 /* Type is not a struct or union.  */
 152    ECTF_NOTENUM,                /* Type is not an enum.  */
 153    ECTF_NOTSUE,                 /* Type is not a struct, union, or enum.  */
 154    ECTF_NOTINTFP,               /* Type is not an integer, float, or enum.  */
 155    ECTF_NOTARRAY,               /* Type is not an array.  */
 156    ECTF_NOTREF,                 /* Type does not reference another type.  */
 157    ECTF_NAMELEN,                /* Buffer is too small to hold type name.  */
 158    ECTF_NOTYPE,                 /* No type found corresponding to name.  */
 159    ECTF_SYNTAX,                 /* Syntax error in type name.  */
 160    ECTF_NOTFUNC,                /* Symtab entry does not refer to a function.  */
 161    ECTF_NOFUNCDAT,              /* No func info available for function.  */
 162    ECTF_NOTDATA,                /* Symtab entry does not refer to a data obj.  */
 163    ECTF_NOTYPEDAT,              /* No type info available for object.  */
 164    ECTF_NOLABEL,                /* No label found corresponding to name.  */
 165    ECTF_NOLABELDATA,            /* File does not contain any labels.  */
 166    ECTF_NOTSUP,                 /* Feature not supported.  */
 167    ECTF_NOENUMNAM,              /* Enum element name not found.  */
 168    ECTF_NOMEMBNAM,              /* Member name not found.  */
 169    ECTF_RDONLY,                 /* CTF container is read-only.  */
 170    ECTF_DTFULL,                 /* CTF type is full (no more members allowed).  */
 171    ECTF_FULL,                   /* CTF container is full.  */
 172    ECTF_DUPLICATE,              /* Duplicate member or variable name.  */
 173    ECTF_CONFLICT,               /* Conflicting type definition present.  */
 174    ECTF_OVERROLLBACK,           /* Attempt to roll back past a ctf_update.  */
 175    ECTF_COMPRESS,               /* Failed to compress CTF data.  */
 176    ECTF_ARCREATE,               /* Error creating CTF archive.  */
 177    ECTF_ARNNAME,                /* Name not found in CTF archive.  */
 178    ECTF_SLICEOVERFLOW,          /* Overflow of type bitness or offset in slice.  */
 179    ECTF_DUMPSECTUNKNOWN,        /* Unknown section number in dump.  */
 180    ECTF_DUMPSECTCHANGED         /* Section changed in middle of dump.  */
 181   };
 182
 183 /* The CTF data model is inferred to be the caller's data model or the data
 184    model of the given object, unless ctf_setmodel() is explicitly called.  */
 185 #define CTF_MODEL_ILP32 1       /* Object data model is ILP32.  */
 186 #define CTF_MODEL_LP64  2       /* Object data model is LP64.  */
 187 #ifdef _LP64
 188 # define CTF_MODEL_NATIVE CTF_MODEL_LP64
 189 #else
 190 # define CTF_MODEL_NATIVE CTF_MODEL_ILP32
 191 #endif
 192
 193 /* Dynamic CTF containers can be created using ctf_create().  The ctf_add_*
 194    routines can be used to add new definitions to the dynamic container.
 195    New types are labeled as root or non-root to determine whether they are
 196    visible at the top-level program scope when subsequently doing a lookup.  */
 197
 198 #define CTF_ADD_NONROOT 0       /* Type only visible in nested scope.  */
 199 #define CTF_ADD_ROOT    1       /* Type visible at top-level scope.  */
 200
 201 extern ctf_file_t *ctf_simple_open (const char *, size_t, const char *, size_t,
 202                                    size_t, const char *, size_t, int *);
 203 extern ctf_file_t *ctf_bufopen (const ctf_sect_t *, const ctf_sect_t *,
 204                                 const ctf_sect_t *, int *);
 205
 206 extern int ctf_errno (ctf_file_t *);
 207 extern const char *ctf_errmsg (int);
 208 extern ctf_id_t ctf_add_array (ctf_file_t *, uint32_t,
 209                                const ctf_arinfo_t *);
 210 extern ctf_id_t ctf_add_const (ctf_file_t *, uint32_t, ctf_id_t);
 211 extern ctf_id_t ctf_add_enum_encoded (ctf_file_t *, uint32_t, const char *,
 212                                       const ctf_encoding_t *);
 213 extern ctf_id_t ctf_add_enum (ctf_file_t *, uint32_t, const char *);
 214 extern ctf_id_t ctf_add_float (ctf_file_t *, uint32_t,
 215                                const char *, const ctf_encoding_t *);
 216 extern ctf_id_t ctf_add_forward (ctf_file_t *, uint32_t, const char *,
 217                                  uint32_t);
 218 extern ctf_id_t ctf_add_function (ctf_file_t *, uint32_t,
 219                                   const ctf_funcinfo_t *, const ctf_id_t *);
 220 extern ctf_id_t ctf_add_integer (ctf_file_t *, uint32_t, const char *,
 221                                  const ctf_encoding_t *);
 222 extern ctf_id_t ctf_add_slice (ctf_file_t *, uint32_t, ctf_id_t, const ctf_encoding_t *);
 223 extern ctf_id_t ctf_add_pointer (ctf_file_t *, uint32_t, ctf_id_t);
 224 extern ctf_id_t ctf_add_type (ctf_file_t *, ctf_file_t *, ctf_id_t);
 225 extern ctf_id_t ctf_add_typedef (ctf_file_t *, uint32_t, const char *,
 226                                  ctf_id_t);
 227 extern ctf_id_t ctf_add_restrict (ctf_file_t *, uint32_t, ctf_id_t);
 228 extern ctf_id_t ctf_add_struct (ctf_file_t *, uint32_t, const char *);
 229 extern ctf_id_t ctf_add_union (ctf_file_t *, uint32_t, const char *);
 230 extern ctf_id_t ctf_add_struct_sized (ctf_file_t *, uint32_t, const char *,
 231                                       size_t);
 232 extern ctf_id_t ctf_add_union_sized (ctf_file_t *, uint32_t, const char *,
 233                                      size_t);
 234 extern ctf_id_t ctf_add_volatile (ctf_file_t *, uint32_t, ctf_id_t);
 235
 236 extern int ctf_add_enumerator (ctf_file_t *, ctf_id_t, const char *, int);
 237 extern int ctf_add_member (ctf_file_t *, ctf_id_t, const char *, ctf_id_t);
 238 extern int ctf_add_member_offset (ctf_file_t *, ctf_id_t, const char *,
 239                                   ctf_id_t, unsigned long);
 240 extern int ctf_add_member_encoded (ctf_file_t *, ctf_id_t, const char *,
 241                                    ctf_id_t, unsigned long,
 242                                    const ctf_encoding_t);
 243
 244 extern int ctf_add_variable (ctf_file_t *, const char *, ctf_id_t);
 245
 246 extern int ctf_set_array (ctf_file_t *, ctf_id_t, const ctf_arinfo_t *);
 247
 248 extern ctf_file_t *ctf_create (int *);
 249 extern int ctf_update (ctf_file_t *);
 250 extern ctf_snapshot_id_t ctf_snapshot (ctf_file_t *);
 251 extern int ctf_rollback (ctf_file_t *, ctf_snapshot_id_t);
 252 extern int ctf_discard (ctf_file_t *);
 253 extern int ctf_write (ctf_file_t *, int);
 254 extern int ctf_gzwrite (ctf_file_t * fp, gzFile fd);
 255 extern int ctf_compress_write (ctf_file_t * fp, int fd);
 256
 257 extern void ctf_setdebug (int debug);
 258 extern int ctf_getdebug (void);
 259
 260 #ifdef  __cplusplus
 261 }
 262 #endif
 263
 264 #endif                          /* _CTF_API_H */