libctf: core type lookup

Finally we get to the functions used to actually look up and enumerate
properties of types in a container (names, sizes, members, what type a
pointer or cv-qual references, determination of whether two types are
assignment-compatible, etc).

With a very few exceptions these do not work for types newly added via
ctf_add_*(): they only work on types in read-only containers, or types
added before the most recent call to ctf_update().

This also adds support for lookup of "variables" (string -> type ID
mappings) and for generation of C type names corresponding to a type ID.

libctf/
	* ctf-decl.c: New file.
	* ctf-types.c: Likewise.
	* ctf-impl.h: New declarations.

include/
	* ctf-api.h (ctf_visit_f): New definition.
	(ctf_member_f): Likewise.
	(ctf_enum_f): Likewise.
	(ctf_variable_f): Likewise.
	(ctf_type_f): Likewise.
	(ctf_type_isparent): Likewise.
	(ctf_type_ischild): Likewise.
	(ctf_type_resolve): Likewise.
	(ctf_type_aname): Likewise.
	(ctf_type_lname): Likewise.
	(ctf_type_name): Likewise.
	(ctf_type_sizee): Likewise.
	(ctf_type_align): Likewise.
	(ctf_type_kind): Likewise.
	(ctf_type_reference): Likewise.
	(ctf_type_pointer): Likewise.
	(ctf_type_encoding): Likewise.
	(ctf_type_visit): Likewise.
	(ctf_type_cmp): Likewise.
	(ctf_type_compat): Likewise.
	(ctf_member_info): Likewise.
	(ctf_array_info): Likewise.
	(ctf_enum_name): Likewise.
	(ctf_enum_value): Likewise.
	(ctf_member_iter): Likewise.
	(ctf_enum_iter): Likewise.
	(ctf_type_iter): Likewise.
	(ctf_variable_iter): Likewise.
This commit is contained in:
Nick Alcock 2019-04-24 11:03:37 +01:00
parent 143dce8481
commit 316afdb130
6 changed files with 1299 additions and 0 deletions

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@ -1,3 +1,34 @@
2019-05-28 Nick Alcock <nick.alcock@oracle.com>
* ctf-api.h (ctf_visit_f): New definition.
(ctf_member_f): Likewise.
(ctf_enum_f): Likewise.
(ctf_variable_f): Likewise.
(ctf_type_f): Likewise.
(ctf_type_isparent): Likewise.
(ctf_type_ischild): Likewise.
(ctf_type_resolve): Likewise.
(ctf_type_aname): Likewise.
(ctf_type_lname): Likewise.
(ctf_type_name): Likewise.
(ctf_type_sizee): Likewise.
(ctf_type_align): Likewise.
(ctf_type_kind): Likewise.
(ctf_type_reference): Likewise.
(ctf_type_pointer): Likewise.
(ctf_type_encoding): Likewise.
(ctf_type_visit): Likewise.
(ctf_type_cmp): Likewise.
(ctf_type_compat): Likewise.
(ctf_member_info): Likewise.
(ctf_array_info): Likewise.
(ctf_enum_name): Likewise.
(ctf_enum_value): Likewise.
(ctf_member_iter): Likewise.
(ctf_enum_iter): Likewise.
(ctf_type_iter): Likewise.
(ctf_variable_iter): Likewise.
2019-05-28 Nick Alcock <nick.alcock@oracle.com>
* ctf-api.h (struct bfd): New forward.

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@ -206,6 +206,13 @@ enum
/* These typedefs are used to define the signature for callback functions
that can be used with the iteration and visit functions below. */
typedef int ctf_visit_f (const char *name, ctf_id_t type, unsigned long offset,
int depth, void *arg);
typedef int ctf_member_f (const char *name, ctf_id_t membtype,
unsigned long offset, void *arg);
typedef int ctf_enum_f (const char *name, int val, void *arg);
typedef int ctf_variable_f (const char *name, ctf_id_t type, void *arg);
typedef int ctf_type_f (ctf_id_t type, void *arg);
typedef int ctf_archive_member_f (ctf_file_t *fp, const char *name, void *arg);
typedef int ctf_archive_raw_member_f (const char *name, const void *content,
size_t len, void *arg);
@ -250,6 +257,8 @@ extern int ctf_arc_write (const char *, ctf_file_t **, size_t,
extern ctf_file_t *ctf_parent_file (ctf_file_t *);
extern const char *ctf_parent_name (ctf_file_t *);
extern void ctf_parent_name_set (ctf_file_t *, const char *);
extern int ctf_type_isparent (ctf_file_t *, ctf_id_t);
extern int ctf_type_ischild (ctf_file_t *, ctf_id_t);
extern int ctf_import (ctf_file_t *, ctf_file_t *);
extern int ctf_setmodel (ctf_file_t *, int);
@ -260,6 +269,32 @@ extern void *ctf_getspecific (ctf_file_t *);
extern int ctf_errno (ctf_file_t *);
extern const char *ctf_errmsg (int);
extern ctf_id_t ctf_type_resolve (ctf_file_t *, ctf_id_t);
extern char *ctf_type_aname (ctf_file_t *, ctf_id_t);
extern ssize_t ctf_type_lname (ctf_file_t *, ctf_id_t, char *, size_t);
extern char *ctf_type_name (ctf_file_t *, ctf_id_t, char *, size_t);
extern ssize_t ctf_type_size (ctf_file_t *, ctf_id_t);
extern ssize_t ctf_type_align (ctf_file_t *, ctf_id_t);
extern int ctf_type_kind (ctf_file_t *, ctf_id_t);
extern ctf_id_t ctf_type_reference (ctf_file_t *, ctf_id_t);
extern ctf_id_t ctf_type_pointer (ctf_file_t *, ctf_id_t);
extern int ctf_type_encoding (ctf_file_t *, ctf_id_t, ctf_encoding_t *);
extern int ctf_type_visit (ctf_file_t *, ctf_id_t, ctf_visit_f *, void *);
extern int ctf_type_cmp (ctf_file_t *, ctf_id_t, ctf_file_t *, ctf_id_t);
extern int ctf_type_compat (ctf_file_t *, ctf_id_t, ctf_file_t *, ctf_id_t);
extern int ctf_member_info (ctf_file_t *, ctf_id_t, const char *,
ctf_membinfo_t *);
extern int ctf_array_info (ctf_file_t *, ctf_id_t, ctf_arinfo_t *);
extern const char *ctf_enum_name (ctf_file_t *, ctf_id_t, int);
extern int ctf_enum_value (ctf_file_t *, ctf_id_t, const char *, int *);
extern int ctf_member_iter (ctf_file_t *, ctf_id_t, ctf_member_f *, void *);
extern int ctf_enum_iter (ctf_file_t *, ctf_id_t, ctf_enum_f *, void *);
extern int ctf_type_iter (ctf_file_t *, ctf_type_f *, void *);
extern int ctf_variable_iter (ctf_file_t *, ctf_variable_f *, void *);
extern int ctf_archive_iter (const ctf_archive_t *, ctf_archive_member_f *,
void *);
/* This function alone does not currently operate on CTF files masquerading
@ -268,6 +303,7 @@ extern int ctf_archive_iter (const ctf_archive_t *, ctf_archive_member_f *,
to deal with non-archives at all. */
extern int ctf_archive_raw_iter (const ctf_archive_t *,
ctf_archive_raw_member_f *, void *);
extern ctf_id_t ctf_add_array (ctf_file_t *, uint32_t,
const ctf_arinfo_t *);
extern ctf_id_t ctf_add_const (ctf_file_t *, uint32_t, ctf_id_t);

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@ -1,3 +1,9 @@
2019-05-28 Nick Alcock <nick.alcock@oracle.com>
* ctf-decl.c: New file.
* ctf-types.c: Likewise.
* ctf-impl.h: New declarations.
2019-05-28 Nick Alcock <nick.alcock@oracle.com>
* ctf-open-bfd.c: New file.

195
libctf/ctf-decl.c Normal file
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@ -0,0 +1,195 @@
/* C declarator syntax glue.
Copyright (C) 2019 Free Software Foundation, Inc.
This file is part of libctf.
libctf is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; see the file COPYING. If not see
<http://www.gnu.org/licenses/>. */
/* CTF Declaration Stack
In order to implement ctf_type_name(), we must convert a type graph back
into a C type declaration. Unfortunately, a type graph represents a storage
class ordering of the type whereas a type declaration must obey the C rules
for operator precedence, and the two orderings are frequently in conflict.
For example, consider these CTF type graphs and their C declarations:
CTF_K_POINTER -> CTF_K_FUNCTION -> CTF_K_INTEGER : int (*)()
CTF_K_POINTER -> CTF_K_ARRAY -> CTF_K_INTEGER : int (*)[]
In each case, parentheses are used to raise operator * to higher lexical
precedence, so the string form of the C declaration cannot be constructed by
walking the type graph links and forming the string from left to right.
The functions in this file build a set of stacks from the type graph nodes
corresponding to the C operator precedence levels in the appropriate order.
The code in ctf_type_name() can then iterate over the levels and nodes in
lexical precedence order and construct the final C declaration string. */
#include <ctf-impl.h>
#include <string.h>
void
ctf_decl_init (ctf_decl_t *cd)
{
int i;
memset (cd, 0, sizeof (ctf_decl_t));
for (i = CTF_PREC_BASE; i < CTF_PREC_MAX; i++)
cd->cd_order[i] = CTF_PREC_BASE - 1;
cd->cd_qualp = CTF_PREC_BASE;
cd->cd_ordp = CTF_PREC_BASE;
}
void
ctf_decl_fini (ctf_decl_t *cd)
{
ctf_decl_node_t *cdp, *ndp;
int i;
for (i = CTF_PREC_BASE; i < CTF_PREC_MAX; i++)
{
for (cdp = ctf_list_next (&cd->cd_nodes[i]); cdp != NULL; cdp = ndp)
{
ndp = ctf_list_next (cdp);
ctf_free (cdp);
}
}
}
void
ctf_decl_push (ctf_decl_t *cd, ctf_file_t *fp, ctf_id_t type)
{
ctf_decl_node_t *cdp;
ctf_decl_prec_t prec;
uint32_t kind, n = 1;
int is_qual = 0;
const ctf_type_t *tp;
ctf_arinfo_t ar;
if ((tp = ctf_lookup_by_id (&fp, type)) == NULL)
{
cd->cd_err = fp->ctf_errno;
return;
}
switch (kind = LCTF_INFO_KIND (fp, tp->ctt_info))
{
case CTF_K_ARRAY:
(void) ctf_array_info (fp, type, &ar);
ctf_decl_push (cd, fp, ar.ctr_contents);
n = ar.ctr_nelems;
prec = CTF_PREC_ARRAY;
break;
case CTF_K_TYPEDEF:
if (ctf_strptr (fp, tp->ctt_name)[0] == '\0')
{
ctf_decl_push (cd, fp, tp->ctt_type);
return;
}
prec = CTF_PREC_BASE;
break;
case CTF_K_FUNCTION:
ctf_decl_push (cd, fp, tp->ctt_type);
prec = CTF_PREC_FUNCTION;
break;
case CTF_K_POINTER:
ctf_decl_push (cd, fp, tp->ctt_type);
prec = CTF_PREC_POINTER;
break;
case CTF_K_SLICE:
ctf_decl_push (cd, fp, ctf_type_reference (fp, type));
prec = CTF_PREC_BASE;
break;
case CTF_K_VOLATILE:
case CTF_K_CONST:
case CTF_K_RESTRICT:
ctf_decl_push (cd, fp, tp->ctt_type);
prec = cd->cd_qualp;
is_qual++;
break;
default:
prec = CTF_PREC_BASE;
}
if ((cdp = ctf_alloc (sizeof (ctf_decl_node_t))) == NULL)
{
cd->cd_err = EAGAIN;
return;
}
cdp->cd_type = type;
cdp->cd_kind = kind;
cdp->cd_n = n;
if (ctf_list_next (&cd->cd_nodes[prec]) == NULL)
cd->cd_order[prec] = cd->cd_ordp++;
/* Reset cd_qualp to the highest precedence level that we've seen so
far that can be qualified (CTF_PREC_BASE or CTF_PREC_POINTER). */
if (prec > cd->cd_qualp && prec < CTF_PREC_ARRAY)
cd->cd_qualp = prec;
/* C array declarators are ordered inside out so prepend them. Also by
convention qualifiers of base types precede the type specifier (e.g.
const int vs. int const) even though the two forms are equivalent. */
if (kind == CTF_K_ARRAY || (is_qual && prec == CTF_PREC_BASE))
ctf_list_prepend (&cd->cd_nodes[prec], cdp);
else
ctf_list_append (&cd->cd_nodes[prec], cdp);
}
_libctf_printflike_ (2, 3)
void ctf_decl_sprintf (ctf_decl_t *cd, const char *format, ...)
{
va_list ap;
char *str;
int n;
if (cd->cd_enomem)
return;
va_start (ap, format);
n = vasprintf (&str, format, ap);
va_end (ap);
if (n > 0)
cd->cd_buf = ctf_str_append (cd->cd_buf, str);
/* Sticky error condition. */
if (n < 0)
{
free (cd->cd_buf);
cd->cd_buf = NULL;
cd->cd_enomem = 1;
}
free (str);
}
char *ctf_decl_buf (ctf_decl_t *cd)
{
return cd->cd_buf;
}

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@ -324,6 +324,14 @@ extern void ctf_dvd_insert (ctf_file_t *, ctf_dvdef_t *);
extern void ctf_dvd_delete (ctf_file_t *, ctf_dvdef_t *);
extern ctf_dvdef_t *ctf_dvd_lookup (const ctf_file_t *, const char *);
extern void ctf_decl_init (ctf_decl_t *);
extern void ctf_decl_fini (ctf_decl_t *);
extern void ctf_decl_push (ctf_decl_t *, ctf_file_t *, ctf_id_t);
_libctf_printflike_ (2, 3)
extern void ctf_decl_sprintf (ctf_decl_t *, const char *, ...);
extern char *ctf_decl_buf (ctf_decl_t *cd);
extern const char *ctf_strraw (ctf_file_t *, uint32_t);
extern const char *ctf_strptr (ctf_file_t *, uint32_t);

1023
libctf/ctf-types.c Normal file

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