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fd55eae84d
libctf supports dynamic upgrading of the type table as file format versions change, but before now has not supported changes to the CTF header. Doing this is complicated by the baroque storage method used: the CTF header is kept prepended to the rest of the CTF data, just as when read from the file, and written out from there, and is endian-flipped in place. This makes accessing it needlessly hard and makes it almost impossible to make the header larger if we add fields. The general storage machinery around the malloced ctf pointer (the 'ctf_base') is also overcomplicated: the pointer is sometimes malloced locally and sometimes assigned from a parameter, so freeing it requires checking to see if that parameter was used, needlessly coupling ctf_bufopen and ctf_file_close together. So split the header out into a new ctf_file_t.ctf_header, which is written out explicitly: squeeze it out of the CTF buffer whenever we reallocate it, and use ctf_file_t.ctf_buf to skip past the header when we do not need to reallocate (when no upgrading or endian-flipping is required). We now track whether the CTF base can be freed explicitly via a new ctf_dynbase pointer which is non-NULL only when freeing is possible. With all this done, we can upgrade the header on the fly and add new fields as desired, via a new upgrade_header function in ctf-open. As with other forms of upgrading, libctf upgrades older headers automatically to the latest supported version at open time. For a first use of this field, we add a new string field cth_cuname, and a corresponding setter/getter pair ctf_cuname_set and ctf_cuname: this is used by debuggers to determine whether a CTF section's types relate to a single compilation unit, or to all compilation units in the program. (Types with ambiguous definitions in different CUs have only one of these types placed in the top-level shared .ctf container: the rest are placed in much smaller per-CU containers, which have the shared container as their parent. Since CTF must be useful in the absence of DWARF, we store the names of the relevant CUs ourselves, so the debugger can look them up.) v5: fix tabdamage. include/ * ctf-api.h (ctf_cuname): New function. (ctf_cuname_set): Likewise. * ctf.h: Improve comment around upgrading, no longer implying that v2 is the target of upgrades (it is v3 now). (ctf_header_v2_t): New, old-format header for backward compatibility. (ctf_header_t): Add cth_cuname: this is the first of several header changes in format v3. libctf/ * ctf-impl.h (ctf_file_t): New fields ctf_header, ctf_dynbase, ctf_cuname, ctf_dyncuname: ctf_base and ctf_buf are no longer const. * ctf-open.c (ctf_set_base): Preserve the gap between ctf_buf and ctf_base: do not assume that it is always sizeof (ctf_header_t). Print out ctf_cuname: only print out ctf_parname if set. (ctf_free_base): Removed, ctf_base is no longer freed: free ctf_dynbase instead. (ctf_set_version): Fix spacing. (upgrade_header): New, in-place header upgrading. (upgrade_types): Rename to... (upgrade_types_v1): ... this. Free ctf_dynbase, not ctf_base. No longer track old and new headers separately. No longer allow for header sizes explicitly: squeeze the headers out on upgrade (they are preserved in fp->ctf_header). Set ctf_dynbase, ctf_base and ctf_buf explicitly. Use ctf_free, not ctf_free_base. (upgrade_types): New, also handle ctf_parmax updating. (flip_header): Flip ctf_cuname. (flip_types): Flip BUF explicitly rather than deriving BUF from BASE. (ctf_bufopen): Store the header in fp->ctf_header. Correct minimum required alignment of objtoff and funcoff. No longer store it in the ctf_buf unless that buf is derived unmodified from the input. Set ctf_dynbase where ctf_base is dynamically allocated. Drop locals that duplicate fields in ctf_file: move allocation of ctf_file further up instead. Call upgrade_header as needed. Move version-specific ctf_parmax initialization into upgrade_types. More concise error handling. (ctf_file_close): No longer test for null pointers before freeing. Free ctf_dyncuname, ctf_dynbase, and ctf_header. Do not call ctf_free_base. (ctf_cuname): New. (ctf_cuname_set): New. * ctf-create.c (ctf_update): Populate ctf_cuname. (ctf_gzwrite): Write out the header explicitly. Remove obsolescent comment. (ctf_write): Likewise. (ctf_compress_write): Get the header from ctf_header, not ctf_base. Fix the compression length: fp->ctf_size never counted the CTF header. Simplify the compress call accordingly.
391 lines
16 KiB
C
391 lines
16 KiB
C
/* Public API to libctf.
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Copyright (C) 2019 Free Software Foundation, Inc.
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This file is part of libctf.
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libctf is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; see the file COPYING. If not see
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<http://www.gnu.org/licenses/>. */
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/* This header file defines the interfaces available from the CTF debugger
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library, libctf. This API can be used by a debugger to operate on data in
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the Compact ANSI-C Type Format (CTF). */
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#ifndef _CTF_API_H
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#define _CTF_API_H
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#include <sys/param.h>
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#include <sys/types.h>
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#include <ctf.h>
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#include <zlib.h>
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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/* Clients can open one or more CTF containers and obtain a pointer to an
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opaque ctf_file_t. Types are identified by an opaque ctf_id_t token.
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They can also open or create read-only archives of CTF containers in a
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ctf_archive_t.
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These opaque definitions allow libctf to evolve without breaking clients. */
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typedef struct ctf_file ctf_file_t;
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typedef struct ctf_archive_internal ctf_archive_t;
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typedef unsigned long ctf_id_t;
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/* This opaque definition allows libctf to accept BFD data structures without
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importing all the BFD noise into users' namespaces. */
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struct bfd;
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/* If the debugger needs to provide the CTF library with a set of raw buffers
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for use as the CTF data, symbol table, and string table, it can do so by
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filling in ctf_sect_t structures and passing them to ctf_bufopen().
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The contents of this structure must always be in native endianness (no
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byteswapping is performed). */
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typedef struct ctf_sect
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{
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const char *cts_name; /* Section name (if any). */
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const void *cts_data; /* Pointer to section data. */
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size_t cts_size; /* Size of data in bytes. */
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size_t cts_entsize; /* Size of each section entry (symtab only). */
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} ctf_sect_t;
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/* Symbolic names for CTF sections. */
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typedef enum ctf_sect_names
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{
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CTF_SECT_HEADER,
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CTF_SECT_LABEL,
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CTF_SECT_OBJT,
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CTF_SECT_FUNC,
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CTF_SECT_VAR,
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CTF_SECT_TYPE,
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CTF_SECT_STR
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} ctf_sect_names_t;
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/* Encoding information for integers, floating-point values, and certain other
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intrinsics can be obtained by calling ctf_type_encoding(), below. The flags
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field will contain values appropriate for the type defined in <ctf.h>. */
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typedef struct ctf_encoding
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{
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uint32_t cte_format; /* Data format (CTF_INT_* or CTF_FP_* flags). */
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uint32_t cte_offset; /* Offset of value in bits. */
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uint32_t cte_bits; /* Size of storage in bits. */
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} ctf_encoding_t;
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typedef struct ctf_membinfo
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{
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ctf_id_t ctm_type; /* Type of struct or union member. */
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unsigned long ctm_offset; /* Offset of member in bits. */
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} ctf_membinfo_t;
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typedef struct ctf_arinfo
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{
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ctf_id_t ctr_contents; /* Type of array contents. */
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ctf_id_t ctr_index; /* Type of array index. */
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uint32_t ctr_nelems; /* Number of elements. */
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} ctf_arinfo_t;
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typedef struct ctf_funcinfo
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{
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ctf_id_t ctc_return; /* Function return type. */
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uint32_t ctc_argc; /* Number of typed arguments to function. */
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uint32_t ctc_flags; /* Function attributes (see below). */
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} ctf_funcinfo_t;
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typedef struct ctf_lblinfo
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{
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ctf_id_t ctb_type; /* Last type associated with the label. */
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} ctf_lblinfo_t;
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typedef struct ctf_snapshot_id
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{
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unsigned long dtd_id; /* Highest DTD ID at time of snapshot. */
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unsigned long snapshot_id; /* Snapshot id at time of snapshot. */
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} ctf_snapshot_id_t;
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#define CTF_FUNC_VARARG 0x1 /* Function arguments end with varargs. */
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/* Functions that return a ctf_id_t use the following value to indicate failure.
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ctf_errno() can be used to obtain an error code. Functions that return
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a straight integral -1 also use ctf_errno(). */
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#define CTF_ERR ((ctf_id_t) -1L)
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#define ECTF_BASE 1000 /* Base value for libctf errnos. */
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enum
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{
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ECTF_FMT = ECTF_BASE, /* File is not in CTF or ELF format. */
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ECTF_BFDERR, /* BFD error. */
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ECTF_CTFVERS, /* CTF version is more recent than libctf. */
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ECTF_BFD_AMBIGUOUS, /* Ambiguous BFD target. */
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ECTF_SYMTAB, /* Symbol table uses invalid entry size. */
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ECTF_SYMBAD, /* Symbol table data buffer invalid. */
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ECTF_STRBAD, /* String table data buffer invalid. */
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ECTF_CORRUPT, /* File data corruption detected. */
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ECTF_NOCTFDATA, /* ELF file does not contain CTF data. */
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ECTF_NOCTFBUF, /* Buffer does not contain CTF data. */
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ECTF_NOSYMTAB, /* Symbol table data is not available. */
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ECTF_NOPARENT, /* Parent CTF container is not available. */
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ECTF_DMODEL, /* Data model mismatch. */
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ECTF_UNUSED, /* Unused error. */
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ECTF_ZALLOC, /* Failed to allocate (de)compression buffer. */
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ECTF_DECOMPRESS, /* Failed to decompress CTF data. */
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ECTF_STRTAB, /* String table for this string is missing. */
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ECTF_BADNAME, /* String offset is corrupt w.r.t. strtab. */
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ECTF_BADID, /* Invalid type ID number. */
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ECTF_NOTSOU, /* Type is not a struct or union. */
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ECTF_NOTENUM, /* Type is not an enum. */
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ECTF_NOTSUE, /* Type is not a struct, union, or enum. */
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ECTF_NOTINTFP, /* Type is not an integer, float, or enum. */
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ECTF_NOTARRAY, /* Type is not an array. */
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ECTF_NOTREF, /* Type does not reference another type. */
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ECTF_NAMELEN, /* Buffer is too small to hold type name. */
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ECTF_NOTYPE, /* No type found corresponding to name. */
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ECTF_SYNTAX, /* Syntax error in type name. */
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ECTF_NOTFUNC, /* Symbol entry or type is not a function. */
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ECTF_NOFUNCDAT, /* No func info available for function. */
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ECTF_NOTDATA, /* Symtab entry does not refer to a data obj. */
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ECTF_NOTYPEDAT, /* No type info available for object. */
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ECTF_NOLABEL, /* No label found corresponding to name. */
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ECTF_NOLABELDATA, /* File does not contain any labels. */
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ECTF_NOTSUP, /* Feature not supported. */
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ECTF_NOENUMNAM, /* Enum element name not found. */
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ECTF_NOMEMBNAM, /* Member name not found. */
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ECTF_RDONLY, /* CTF container is read-only. */
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ECTF_DTFULL, /* CTF type is full (no more members allowed). */
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ECTF_FULL, /* CTF container is full. */
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ECTF_DUPLICATE, /* Duplicate member or variable name. */
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ECTF_CONFLICT, /* Conflicting type definition present. */
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ECTF_OVERROLLBACK, /* Attempt to roll back past a ctf_update. */
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ECTF_COMPRESS, /* Failed to compress CTF data. */
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ECTF_ARCREATE, /* Error creating CTF archive. */
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ECTF_ARNNAME, /* Name not found in CTF archive. */
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ECTF_SLICEOVERFLOW, /* Overflow of type bitness or offset in slice. */
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ECTF_DUMPSECTUNKNOWN, /* Unknown section number in dump. */
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ECTF_DUMPSECTCHANGED /* Section changed in middle of dump. */
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};
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/* The CTF data model is inferred to be the caller's data model or the data
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model of the given object, unless ctf_setmodel() is explicitly called. */
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#define CTF_MODEL_ILP32 1 /* Object data model is ILP32. */
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#define CTF_MODEL_LP64 2 /* Object data model is LP64. */
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#ifdef _LP64
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# define CTF_MODEL_NATIVE CTF_MODEL_LP64
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#else
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# define CTF_MODEL_NATIVE CTF_MODEL_ILP32
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#endif
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/* Dynamic CTF containers can be created using ctf_create(). The ctf_add_*
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routines can be used to add new definitions to the dynamic container.
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New types are labeled as root or non-root to determine whether they are
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visible at the top-level program scope when subsequently doing a lookup. */
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#define CTF_ADD_NONROOT 0 /* Type only visible in nested scope. */
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#define CTF_ADD_ROOT 1 /* Type visible at top-level scope. */
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/* These typedefs are used to define the signature for callback functions
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that can be used with the iteration and visit functions below. */
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typedef int ctf_visit_f (const char *name, ctf_id_t type, unsigned long offset,
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int depth, void *arg);
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typedef int ctf_member_f (const char *name, ctf_id_t membtype,
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unsigned long offset, void *arg);
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typedef int ctf_enum_f (const char *name, int val, void *arg);
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typedef int ctf_variable_f (const char *name, ctf_id_t type, void *arg);
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typedef int ctf_type_f (ctf_id_t type, void *arg);
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typedef int ctf_label_f (const char *name, const ctf_lblinfo_t *info,
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void *arg);
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typedef int ctf_archive_member_f (ctf_file_t *fp, const char *name, void *arg);
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typedef int ctf_archive_raw_member_f (const char *name, const void *content,
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size_t len, void *arg);
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typedef char *ctf_dump_decorate_f (ctf_sect_names_t sect,
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char *line, void *arg);
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typedef struct ctf_dump_state ctf_dump_state_t;
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/* Opening. These mostly return an abstraction over both CTF files and CTF
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archives: so they can be used to open both. CTF files will appear to be an
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archive with one member named '.ctf'. The low-level functions
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ctf_simple_open() and ctf_bufopen() return ctf_file_t's directly, and cannot
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be used on CTF archives. */
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extern ctf_archive_t *ctf_bfdopen (struct bfd *, int *);
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extern ctf_archive_t *ctf_bfdopen_ctfsect (struct bfd *, const ctf_sect_t *,
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int *);
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extern ctf_archive_t *ctf_fdopen (int fd, const char *filename,
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const char *target, int *errp);
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extern ctf_archive_t *ctf_open (const char *filename,
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const char *target, int *errp);
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extern void ctf_close (ctf_archive_t *);
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extern ctf_sect_t ctf_getdatasect (const ctf_file_t *);
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extern ctf_archive_t *ctf_get_arc (const ctf_file_t *);
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extern ctf_archive_t *ctf_arc_open (const char *, int *);
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extern void ctf_arc_close (ctf_archive_t *);
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extern ctf_file_t *ctf_arc_open_by_name (const ctf_archive_t *,
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const char *, int *);
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extern ctf_file_t *ctf_arc_open_by_name_sections (const ctf_archive_t *,
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const ctf_sect_t *,
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const ctf_sect_t *,
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const char *, int *);
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/* The next functions return or close real CTF files, or write out CTF archives,
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not opaque containers around either. */
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extern ctf_file_t *ctf_simple_open (const char *, size_t, const char *, size_t,
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size_t, const char *, size_t, int *);
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extern ctf_file_t *ctf_bufopen (const ctf_sect_t *, const ctf_sect_t *,
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const ctf_sect_t *, int *);
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extern void ctf_file_close (ctf_file_t *);
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extern int ctf_arc_write (const char *, ctf_file_t **, size_t,
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const char **, size_t);
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extern const char *ctf_cuname (ctf_file_t *);
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extern void ctf_cuname_set (ctf_file_t *, const char *);
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extern ctf_file_t *ctf_parent_file (ctf_file_t *);
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extern const char *ctf_parent_name (ctf_file_t *);
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extern void ctf_parent_name_set (ctf_file_t *, const char *);
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extern int ctf_type_isparent (ctf_file_t *, ctf_id_t);
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extern int ctf_type_ischild (ctf_file_t *, ctf_id_t);
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extern int ctf_import (ctf_file_t *, ctf_file_t *);
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extern int ctf_setmodel (ctf_file_t *, int);
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extern int ctf_getmodel (ctf_file_t *);
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extern void ctf_setspecific (ctf_file_t *, void *);
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extern void *ctf_getspecific (ctf_file_t *);
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extern int ctf_errno (ctf_file_t *);
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extern const char *ctf_errmsg (int);
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extern int ctf_version (int);
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extern int ctf_func_info (ctf_file_t *, unsigned long, ctf_funcinfo_t *);
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extern int ctf_func_args (ctf_file_t *, unsigned long, uint32_t, ctf_id_t *);
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extern int ctf_func_type_info (ctf_file_t *, ctf_id_t, ctf_funcinfo_t *);
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extern int ctf_func_type_args (ctf_file_t *, ctf_id_t, uint32_t, ctf_id_t *);
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extern ctf_id_t ctf_lookup_by_name (ctf_file_t *, const char *);
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extern ctf_id_t ctf_lookup_by_symbol (ctf_file_t *, unsigned long);
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extern ctf_id_t ctf_lookup_variable (ctf_file_t *, const char *);
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extern ctf_id_t ctf_type_resolve (ctf_file_t *, ctf_id_t);
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extern char *ctf_type_aname (ctf_file_t *, ctf_id_t);
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extern char *ctf_type_aname_raw (ctf_file_t *, ctf_id_t);
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extern ssize_t ctf_type_lname (ctf_file_t *, ctf_id_t, char *, size_t);
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extern char *ctf_type_name (ctf_file_t *, ctf_id_t, char *, size_t);
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extern ssize_t ctf_type_size (ctf_file_t *, ctf_id_t);
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extern ssize_t ctf_type_align (ctf_file_t *, ctf_id_t);
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extern int ctf_type_kind (ctf_file_t *, ctf_id_t);
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extern ctf_id_t ctf_type_reference (ctf_file_t *, ctf_id_t);
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extern ctf_id_t ctf_type_pointer (ctf_file_t *, ctf_id_t);
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extern int ctf_type_encoding (ctf_file_t *, ctf_id_t, ctf_encoding_t *);
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extern int ctf_type_visit (ctf_file_t *, ctf_id_t, ctf_visit_f *, void *);
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extern int ctf_type_cmp (ctf_file_t *, ctf_id_t, ctf_file_t *, ctf_id_t);
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extern int ctf_type_compat (ctf_file_t *, ctf_id_t, ctf_file_t *, ctf_id_t);
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extern int ctf_member_info (ctf_file_t *, ctf_id_t, const char *,
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ctf_membinfo_t *);
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extern int ctf_array_info (ctf_file_t *, ctf_id_t, ctf_arinfo_t *);
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extern const char *ctf_enum_name (ctf_file_t *, ctf_id_t, int);
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extern int ctf_enum_value (ctf_file_t *, ctf_id_t, const char *, int *);
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extern void ctf_label_set (ctf_file_t *, const char *);
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extern const char *ctf_label_get (ctf_file_t *);
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extern const char *ctf_label_topmost (ctf_file_t *);
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extern int ctf_label_info (ctf_file_t *, const char *, ctf_lblinfo_t *);
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extern int ctf_member_iter (ctf_file_t *, ctf_id_t, ctf_member_f *, void *);
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extern int ctf_enum_iter (ctf_file_t *, ctf_id_t, ctf_enum_f *, void *);
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extern int ctf_type_iter (ctf_file_t *, ctf_type_f *, void *);
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extern int ctf_label_iter (ctf_file_t *, ctf_label_f *, void *);
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extern int ctf_variable_iter (ctf_file_t *, ctf_variable_f *, void *);
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extern int ctf_archive_iter (const ctf_archive_t *, ctf_archive_member_f *,
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void *);
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/* This function alone does not currently operate on CTF files masquerading
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as archives, and returns -EINVAL: the raw data is no longer available. It is
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expected to be used only by archiving tools, in any case, which have no need
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to deal with non-archives at all. */
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extern int ctf_archive_raw_iter (const ctf_archive_t *,
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ctf_archive_raw_member_f *, void *);
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extern char *ctf_dump (ctf_file_t *, ctf_dump_state_t **state,
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ctf_sect_names_t sect, ctf_dump_decorate_f *,
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void *arg);
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extern ctf_id_t ctf_add_array (ctf_file_t *, uint32_t,
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const ctf_arinfo_t *);
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extern ctf_id_t ctf_add_const (ctf_file_t *, uint32_t, ctf_id_t);
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extern ctf_id_t ctf_add_enum_encoded (ctf_file_t *, uint32_t, const char *,
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const ctf_encoding_t *);
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extern ctf_id_t ctf_add_enum (ctf_file_t *, uint32_t, const char *);
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extern ctf_id_t ctf_add_float (ctf_file_t *, uint32_t,
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const char *, const ctf_encoding_t *);
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extern ctf_id_t ctf_add_forward (ctf_file_t *, uint32_t, const char *,
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uint32_t);
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extern ctf_id_t ctf_add_function (ctf_file_t *, uint32_t,
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const ctf_funcinfo_t *, const ctf_id_t *);
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extern ctf_id_t ctf_add_integer (ctf_file_t *, uint32_t, const char *,
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const ctf_encoding_t *);
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extern ctf_id_t ctf_add_slice (ctf_file_t *, uint32_t, ctf_id_t, const ctf_encoding_t *);
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extern ctf_id_t ctf_add_pointer (ctf_file_t *, uint32_t, ctf_id_t);
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extern ctf_id_t ctf_add_type (ctf_file_t *, ctf_file_t *, ctf_id_t);
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extern ctf_id_t ctf_add_typedef (ctf_file_t *, uint32_t, const char *,
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ctf_id_t);
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extern ctf_id_t ctf_add_restrict (ctf_file_t *, uint32_t, ctf_id_t);
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extern ctf_id_t ctf_add_struct (ctf_file_t *, uint32_t, const char *);
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extern ctf_id_t ctf_add_union (ctf_file_t *, uint32_t, const char *);
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extern ctf_id_t ctf_add_struct_sized (ctf_file_t *, uint32_t, const char *,
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size_t);
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extern ctf_id_t ctf_add_union_sized (ctf_file_t *, uint32_t, const char *,
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size_t);
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extern ctf_id_t ctf_add_volatile (ctf_file_t *, uint32_t, ctf_id_t);
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extern int ctf_add_enumerator (ctf_file_t *, ctf_id_t, const char *, int);
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extern int ctf_add_member (ctf_file_t *, ctf_id_t, const char *, ctf_id_t);
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extern int ctf_add_member_offset (ctf_file_t *, ctf_id_t, const char *,
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ctf_id_t, unsigned long);
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extern int ctf_add_member_encoded (ctf_file_t *, ctf_id_t, const char *,
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ctf_id_t, unsigned long,
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const ctf_encoding_t);
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extern int ctf_add_variable (ctf_file_t *, const char *, ctf_id_t);
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extern int ctf_set_array (ctf_file_t *, ctf_id_t, const ctf_arinfo_t *);
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extern ctf_file_t *ctf_create (int *);
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extern int ctf_update (ctf_file_t *);
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extern ctf_snapshot_id_t ctf_snapshot (ctf_file_t *);
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extern int ctf_rollback (ctf_file_t *, ctf_snapshot_id_t);
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extern int ctf_discard (ctf_file_t *);
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extern int ctf_write (ctf_file_t *, int);
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extern int ctf_gzwrite (ctf_file_t * fp, gzFile fd);
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extern int ctf_compress_write (ctf_file_t * fp, int fd);
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extern void ctf_setdebug (int debug);
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extern int ctf_getdebug (void);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _CTF_API_H */
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