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authorXin LI <delphij@FreeBSD.org>2013-08-23 23:21:24 +0000
committerXin LI <delphij@FreeBSD.org>2013-08-23 23:21:24 +0000
commit3f0164abf32b9b761e0a2cb4bdca3a8b84f156d4 (patch)
treead32c6f1bbf74e601fd4395f5a07217ce6a2de60 /cddl/contrib/opensolaris/common
parent2adf57829e4883498a3534ae7a11d63bdd7aaaee (diff)
parentd5c2dea67b865ff920561f44fe5ac092ccdf581f (diff)
downloadsrc-3f0164abf32b9b761e0a2cb4bdca3a8b84f156d4.tar.gz
src-3f0164abf32b9b761e0a2cb4bdca3a8b84f156d4.zip
MFV r254422:
Illumos DTrace issues: 3089 want ::typedef 3094 libctf should support removing a dynamic type 3095 libctf does not validate arrays correctly 3096 libctf does not validate function types correctly
Notes
Notes: svn path=/head/; revision=254744
Diffstat (limited to 'cddl/contrib/opensolaris/common')
-rw-r--r--cddl/contrib/opensolaris/common/ctf/ctf_create.c190
-rw-r--r--cddl/contrib/opensolaris/common/ctf/ctf_error.c7
-rw-r--r--cddl/contrib/opensolaris/common/ctf/ctf_impl.h10
-rw-r--r--cddl/contrib/opensolaris/common/ctf/ctf_open.c13
4 files changed, 204 insertions, 16 deletions
diff --git a/cddl/contrib/opensolaris/common/ctf/ctf_create.c b/cddl/contrib/opensolaris/common/ctf/ctf_create.c
index a4f3df34e8cf..239d166f4412 100644
--- a/cddl/contrib/opensolaris/common/ctf/ctf_create.c
+++ b/cddl/contrib/opensolaris/common/ctf/ctf_create.c
@@ -24,13 +24,15 @@
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
-
-#pragma ident "%Z%%M% %I% %E% SMI"
+/*
+ * Copyright (c) 2013, Joyent, Inc. All rights reserved.
+ */
#include <sys/sysmacros.h>
#include <sys/param.h>
#include <sys/mman.h>
#include <ctf_impl.h>
+#include <sys/debug.h>
/*
* This static string is used as the template for initially populating a
@@ -167,6 +169,51 @@ ctf_copy_membnames(ctf_dtdef_t *dtd, uchar_t *s)
}
/*
+ * Only types of dyanmic CTF containers contain reference counts. These
+ * containers are marked RD/WR. Because of that we basically make this a no-op
+ * for compatability with non-dynamic CTF sections. This is also a no-op for
+ * types which are not dynamic types. It is the responsibility of the caller to
+ * make sure it is a valid type. We help that caller out on debug builds.
+ *
+ * Note that the reference counts are not maintained for types that are not
+ * within this container. In other words if we have a type in a parent, that
+ * will not have its reference count increased. On the flip side, the parent
+ * will not be allowed to remove dynamic types if it has children.
+ */
+static void
+ctf_ref_inc(ctf_file_t *fp, ctf_id_t tid)
+{
+ ctf_dtdef_t *dtd = ctf_dtd_lookup(fp, tid);
+
+ if (dtd == NULL)
+ return;
+
+ if (!(fp->ctf_flags & LCTF_RDWR))
+ return;
+
+ dtd->dtd_ref++;
+}
+
+/*
+ * Just as with ctf_ref_inc, this is a no-op on non-writeable containers and the
+ * caller should ensure that this is already a valid type.
+ */
+static void
+ctf_ref_dec(ctf_file_t *fp, ctf_id_t tid)
+{
+ ctf_dtdef_t *dtd = ctf_dtd_lookup(fp, tid);
+
+ if (dtd == NULL)
+ return;
+
+ if (!(fp->ctf_flags & LCTF_RDWR))
+ return;
+
+ ASSERT(dtd->dtd_ref >= 1);
+ dtd->dtd_ref--;
+}
+
+/*
* If the specified CTF container is writable and has been modified, reload
* this container with the updated type definitions. In order to make this
* code and the rest of libctf as simple as possible, we perform updates by
@@ -180,6 +227,10 @@ ctf_copy_membnames(ctf_dtdef_t *dtd, uchar_t *s)
* ctf_bufopen() will return a new ctf_file_t, but we want to keep the fp
* constant for the caller, so after ctf_bufopen() returns, we use bcopy to
* swap the interior of the old and new ctf_file_t's, and then free the old.
+ *
+ * Note that the lists of dynamic types stays around and the resulting container
+ * is still writeable. Furthermore, the reference counts that are on the dtd's
+ * are still valid.
*/
int
ctf_update(ctf_file_t *fp)
@@ -432,6 +483,7 @@ ctf_dtd_delete(ctf_file_t *fp, ctf_dtdef_t *dtd)
ctf_dtdef_t *p, **q = &fp->ctf_dthash[h];
ctf_dmdef_t *dmd, *nmd;
size_t len;
+ int kind, i;
for (p = *q; p != NULL; p = p->dtd_hash) {
if (p != dtd)
@@ -443,7 +495,8 @@ ctf_dtd_delete(ctf_file_t *fp, ctf_dtdef_t *dtd)
if (p != NULL)
*q = p->dtd_hash;
- switch (CTF_INFO_KIND(dtd->dtd_data.ctt_info)) {
+ kind = CTF_INFO_KIND(dtd->dtd_data.ctt_info);
+ switch (kind) {
case CTF_K_STRUCT:
case CTF_K_UNION:
case CTF_K_ENUM:
@@ -454,14 +507,33 @@ ctf_dtd_delete(ctf_file_t *fp, ctf_dtdef_t *dtd)
ctf_free(dmd->dmd_name, len);
fp->ctf_dtstrlen -= len;
}
+ if (kind != CTF_K_ENUM)
+ ctf_ref_dec(fp, dmd->dmd_type);
nmd = ctf_list_next(dmd);
ctf_free(dmd, sizeof (ctf_dmdef_t));
}
break;
case CTF_K_FUNCTION:
+ ctf_ref_dec(fp, dtd->dtd_data.ctt_type);
+ for (i = 0; i < CTF_INFO_VLEN(dtd->dtd_data.ctt_info); i++)
+ if (dtd->dtd_u.dtu_argv[i] != 0)
+ ctf_ref_dec(fp, dtd->dtd_u.dtu_argv[i]);
ctf_free(dtd->dtd_u.dtu_argv, sizeof (ctf_id_t) *
CTF_INFO_VLEN(dtd->dtd_data.ctt_info));
break;
+ case CTF_K_ARRAY:
+ ctf_ref_dec(fp, dtd->dtd_u.dtu_arr.ctr_contents);
+ ctf_ref_dec(fp, dtd->dtd_u.dtu_arr.ctr_index);
+ break;
+ case CTF_K_TYPEDEF:
+ ctf_ref_dec(fp, dtd->dtd_data.ctt_type);
+ break;
+ case CTF_K_POINTER:
+ case CTF_K_VOLATILE:
+ case CTF_K_CONST:
+ case CTF_K_RESTRICT:
+ ctf_ref_dec(fp, dtd->dtd_data.ctt_type);
+ break;
}
if (dtd->dtd_name) {
@@ -495,7 +567,9 @@ ctf_dtd_lookup(ctf_file_t *fp, ctf_id_t type)
* Discard all of the dynamic type definitions that have been added to the
* container since the last call to ctf_update(). We locate such types by
* scanning the list and deleting elements that have type IDs greater than
- * ctf_dtoldid, which is set by ctf_update(), above.
+ * ctf_dtoldid, which is set by ctf_update(), above. Note that to work properly
+ * with our reference counting schemes, we must delete the dynamic list in
+ * reverse.
*/
int
ctf_discard(ctf_file_t *fp)
@@ -508,11 +582,11 @@ ctf_discard(ctf_file_t *fp)
if (!(fp->ctf_flags & LCTF_DIRTY))
return (0); /* no update required */
- for (dtd = ctf_list_next(&fp->ctf_dtdefs); dtd != NULL; dtd = ntd) {
+ for (dtd = ctf_list_prev(&fp->ctf_dtdefs); dtd != NULL; dtd = ntd) {
if (dtd->dtd_type <= fp->ctf_dtoldid)
continue; /* skip types that have been committed */
- ntd = ctf_list_next(dtd);
+ ntd = ctf_list_prev(dtd);
ctf_dtd_delete(fp, dtd);
}
@@ -614,6 +688,8 @@ ctf_add_reftype(ctf_file_t *fp, uint_t flag, ctf_id_t ref, uint_t kind)
if ((type = ctf_add_generic(fp, flag, NULL, &dtd)) == CTF_ERR)
return (CTF_ERR); /* errno is set for us */
+ ctf_ref_inc(fp, ref);
+
dtd->dtd_data.ctt_info = CTF_TYPE_INFO(kind, flag, 0);
dtd->dtd_data.ctt_type = (ushort_t)ref;
@@ -645,16 +721,29 @@ ctf_add_array(ctf_file_t *fp, uint_t flag, const ctf_arinfo_t *arp)
{
ctf_dtdef_t *dtd;
ctf_id_t type;
+ ctf_file_t *fpd;
if (arp == NULL)
return (ctf_set_errno(fp, EINVAL));
+ fpd = fp;
+ if (ctf_lookup_by_id(&fpd, arp->ctr_contents) == NULL &&
+ ctf_dtd_lookup(fp, arp->ctr_contents) == NULL)
+ return (ctf_set_errno(fp, ECTF_BADID));
+
+ fpd = fp;
+ if (ctf_lookup_by_id(&fpd, arp->ctr_index) == NULL &&
+ ctf_dtd_lookup(fp, arp->ctr_index) == NULL)
+ return (ctf_set_errno(fp, ECTF_BADID));
+
if ((type = ctf_add_generic(fp, flag, NULL, &dtd)) == CTF_ERR)
return (CTF_ERR); /* errno is set for us */
dtd->dtd_data.ctt_info = CTF_TYPE_INFO(CTF_K_ARRAY, flag, 0);
dtd->dtd_data.ctt_size = 0;
dtd->dtd_u.dtu_arr = *arp;
+ ctf_ref_inc(fp, arp->ctr_contents);
+ ctf_ref_inc(fp, arp->ctr_index);
return (type);
}
@@ -662,6 +751,7 @@ ctf_add_array(ctf_file_t *fp, uint_t flag, const ctf_arinfo_t *arp)
int
ctf_set_array(ctf_file_t *fp, ctf_id_t type, const ctf_arinfo_t *arp)
{
+ ctf_file_t *fpd;
ctf_dtdef_t *dtd = ctf_dtd_lookup(fp, type);
if (!(fp->ctf_flags & LCTF_RDWR))
@@ -670,8 +760,22 @@ ctf_set_array(ctf_file_t *fp, ctf_id_t type, const ctf_arinfo_t *arp)
if (dtd == NULL || CTF_INFO_KIND(dtd->dtd_data.ctt_info) != CTF_K_ARRAY)
return (ctf_set_errno(fp, ECTF_BADID));
+ fpd = fp;
+ if (ctf_lookup_by_id(&fpd, arp->ctr_contents) == NULL &&
+ ctf_dtd_lookup(fp, arp->ctr_contents) == NULL)
+ return (ctf_set_errno(fp, ECTF_BADID));
+
+ fpd = fp;
+ if (ctf_lookup_by_id(&fpd, arp->ctr_index) == NULL &&
+ ctf_dtd_lookup(fp, arp->ctr_index) == NULL)
+ return (ctf_set_errno(fp, ECTF_BADID));
+
+ ctf_ref_dec(fp, dtd->dtd_u.dtu_arr.ctr_contents);
+ ctf_ref_dec(fp, dtd->dtd_u.dtu_arr.ctr_index);
fp->ctf_flags |= LCTF_DIRTY;
dtd->dtd_u.dtu_arr = *arp;
+ ctf_ref_inc(fp, arp->ctr_contents);
+ ctf_ref_inc(fp, arp->ctr_index);
return (0);
}
@@ -683,7 +787,9 @@ ctf_add_function(ctf_file_t *fp, uint_t flag,
ctf_dtdef_t *dtd;
ctf_id_t type;
uint_t vlen;
+ int i;
ctf_id_t *vdat = NULL;
+ ctf_file_t *fpd;
if (ctc == NULL || (ctc->ctc_flags & ~CTF_FUNC_VARARG) != 0 ||
(ctc->ctc_argc != 0 && argv == NULL))
@@ -696,6 +802,18 @@ ctf_add_function(ctf_file_t *fp, uint_t flag,
if (vlen > CTF_MAX_VLEN)
return (ctf_set_errno(fp, EOVERFLOW));
+ fpd = fp;
+ if (ctf_lookup_by_id(&fpd, ctc->ctc_return) == NULL &&
+ ctf_dtd_lookup(fp, ctc->ctc_return) == NULL)
+ return (ctf_set_errno(fp, ECTF_BADID));
+
+ for (i = 0; i < ctc->ctc_argc; i++) {
+ fpd = fp;
+ if (ctf_lookup_by_id(&fpd, argv[i]) == NULL &&
+ ctf_dtd_lookup(fp, argv[i]) == NULL)
+ return (ctf_set_errno(fp, ECTF_BADID));
+ }
+
if (vlen != 0 && (vdat = ctf_alloc(sizeof (ctf_id_t) * vlen)) == NULL)
return (ctf_set_errno(fp, EAGAIN));
@@ -707,6 +825,10 @@ ctf_add_function(ctf_file_t *fp, uint_t flag,
dtd->dtd_data.ctt_info = CTF_TYPE_INFO(CTF_K_FUNCTION, flag, vlen);
dtd->dtd_data.ctt_type = (ushort_t)ctc->ctc_return;
+ ctf_ref_inc(fp, ctc->ctc_return);
+ for (i = 0; i < ctc->ctc_argc; i++)
+ ctf_ref_inc(fp, argv[i]);
+
bcopy(argv, vdat, sizeof (ctf_id_t) * ctc->ctc_argc);
if (ctc->ctc_flags & CTF_FUNC_VARARG)
vdat[vlen - 1] = 0; /* add trailing zero to indicate varargs */
@@ -825,8 +947,11 @@ ctf_add_typedef(ctf_file_t *fp, uint_t flag, const char *name, ctf_id_t ref)
{
ctf_dtdef_t *dtd;
ctf_id_t type;
+ ctf_file_t *fpd;
- if (ref == CTF_ERR || ref < 0 || ref > CTF_MAX_TYPE)
+ fpd = fp;
+ if (ref == CTF_ERR || (ctf_lookup_by_id(&fpd, ref) == NULL &&
+ ctf_dtd_lookup(fp, ref) == NULL))
return (ctf_set_errno(fp, EINVAL));
if ((type = ctf_add_generic(fp, flag, name, &dtd)) == CTF_ERR)
@@ -834,6 +959,7 @@ ctf_add_typedef(ctf_file_t *fp, uint_t flag, const char *name, ctf_id_t ref)
dtd->dtd_data.ctt_info = CTF_TYPE_INFO(CTF_K_TYPEDEF, flag, 0);
dtd->dtd_data.ctt_type = (ushort_t)ref;
+ ctf_ref_inc(fp, ref);
return (type);
}
@@ -1008,6 +1134,45 @@ ctf_add_member(ctf_file_t *fp, ctf_id_t souid, const char *name, ctf_id_t type)
if (s != NULL)
fp->ctf_dtstrlen += strlen(s) + 1;
+ ctf_ref_inc(fp, type);
+ fp->ctf_flags |= LCTF_DIRTY;
+ return (0);
+}
+
+/*
+ * This removes a type from the dynamic section. This will fail if the type is
+ * referenced by another type. Note that the CTF ID is never reused currently by
+ * CTF. Note that if this container is a parent container then we just outright
+ * refuse to remove the type. There currently is no notion of searching for the
+ * ctf_dtdef_t in parent containers. If there is, then this constraint could
+ * become finer grained.
+ */
+int
+ctf_delete_type(ctf_file_t *fp, ctf_id_t type)
+{
+ ctf_file_t *fpd;
+ ctf_dtdef_t *dtd = ctf_dtd_lookup(fp, type);
+
+ if (!(fp->ctf_flags & LCTF_RDWR))
+ return (ctf_set_errno(fp, ECTF_RDONLY));
+
+ /*
+ * We want to give as useful an errno as possible. That means that we
+ * want to distinguish between a type which does not exist and one for
+ * which the type is not dynamic.
+ */
+ fpd = fp;
+ if (ctf_lookup_by_id(&fpd, type) == NULL &&
+ ctf_dtd_lookup(fp, type) == NULL)
+ return (CTF_ERR); /* errno is set for us */
+
+ if (dtd == NULL)
+ return (ctf_set_errno(fp, ECTF_NOTDYN));
+
+ if (dtd->dtd_ref != 0 || fp->ctf_refcnt > 1)
+ return (ctf_set_errno(fp, ECTF_REFERENCED));
+
+ ctf_dtd_delete(fp, dtd);
fp->ctf_flags |= LCTF_DIRTY;
return (0);
}
@@ -1103,6 +1268,9 @@ ctf_add_type(ctf_file_t *dst_fp, ctf_file_t *src_fp, ctf_id_t src_type)
ctf_hash_t *hp;
ctf_helem_t *hep;
+ if (dst_fp == src_fp)
+ return (src_type);
+
if (!(dst_fp->ctf_flags & LCTF_RDWR))
return (ctf_set_errno(dst_fp, ECTF_RDONLY));
@@ -1313,6 +1481,14 @@ ctf_add_type(ctf_file_t *dst_fp, ctf_file_t *src_fp, ctf_id_t src_type)
if (errs)
return (CTF_ERR); /* errno is set for us */
+
+ /*
+ * Now that we know that we can't fail, we go through and bump
+ * all the reference counts on the member types.
+ */
+ for (dmd = ctf_list_next(&dtd->dtd_u.dtu_members);
+ dmd != NULL; dmd = ctf_list_next(dmd))
+ ctf_ref_inc(dst_fp, dmd->dmd_type);
break;
}
diff --git a/cddl/contrib/opensolaris/common/ctf/ctf_error.c b/cddl/contrib/opensolaris/common/ctf/ctf_error.c
index 888c6c848b3f..fe3d0de0cb93 100644
--- a/cddl/contrib/opensolaris/common/ctf/ctf_error.c
+++ b/cddl/contrib/opensolaris/common/ctf/ctf_error.c
@@ -23,8 +23,9 @@
* Copyright 2003 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
-
-#pragma ident "%Z%%M% %I% %E% SMI"
+/*
+ * Copyright (c) 2012, Joyent, Inc.
+ */
#include <ctf_impl.h>
@@ -73,6 +74,8 @@ static const char *const _ctf_errlist[] = {
"Limit on number of dynamic types reached", /* ECTF_FULL */
"Duplicate member name definition", /* ECTF_DUPMEMBER */
"Conflicting type is already defined", /* ECTF_CONFLICT */
+ "Type has outstanding references", /* ECTF_REFERENCED */
+ "Type is not a dynamic type" /* ECTF_NOTDYN */
};
static const int _ctf_nerr = sizeof (_ctf_errlist) / sizeof (_ctf_errlist[0]);
diff --git a/cddl/contrib/opensolaris/common/ctf/ctf_impl.h b/cddl/contrib/opensolaris/common/ctf/ctf_impl.h
index 99990806a32e..f56fa6a00548 100644
--- a/cddl/contrib/opensolaris/common/ctf/ctf_impl.h
+++ b/cddl/contrib/opensolaris/common/ctf/ctf_impl.h
@@ -24,12 +24,13 @@
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
+/*
+ * Copyright (c) 2012, Joyent, Inc. All rights reserved.
+ */
#ifndef _CTF_IMPL_H
#define _CTF_IMPL_H
-#pragma ident "%Z%%M% %I% %E% SMI"
-
#include <sys/types.h>
#include <sys/errno.h>
#include <sys/sysmacros.h>
@@ -149,6 +150,7 @@ typedef struct ctf_dtdef {
char *dtd_name; /* name associated with definition (if any) */
ctf_id_t dtd_type; /* type identifier for this definition */
ctf_type_t dtd_data; /* type node (see <sys/ctf.h>) */
+ int dtd_ref; /* recfount for dyanmic types */
union {
ctf_list_t dtu_members; /* struct, union, or enum */
ctf_arinfo_t dtu_arr; /* array */
@@ -269,7 +271,9 @@ enum {
ECTF_DTFULL, /* CTF type is full (no more members allowed) */
ECTF_FULL, /* CTF container is full */
ECTF_DUPMEMBER, /* duplicate member name definition */
- ECTF_CONFLICT /* conflicting type definition present */
+ ECTF_CONFLICT, /* conflicting type definition present */
+ ECTF_REFERENCED, /* type has outstanding references */
+ ECTF_NOTDYN /* type is not a dynamic type */
};
extern ssize_t ctf_get_ctt_size(const ctf_file_t *, const ctf_type_t *,
diff --git a/cddl/contrib/opensolaris/common/ctf/ctf_open.c b/cddl/contrib/opensolaris/common/ctf/ctf_open.c
index e49a4cb32934..2148389fff80 100644
--- a/cddl/contrib/opensolaris/common/ctf/ctf_open.c
+++ b/cddl/contrib/opensolaris/common/ctf/ctf_open.c
@@ -24,8 +24,9 @@
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
-
-#pragma ident "%Z%%M% %I% %E% SMI"
+/*
+ * Copyright (c) 2012, Joyent, Inc. All rights reserved.
+ */
#include <ctf_impl.h>
#include <sys/mman.h>
@@ -810,8 +811,12 @@ ctf_close(ctf_file_t *fp)
if (fp->ctf_parent != NULL)
ctf_close(fp->ctf_parent);
- for (dtd = ctf_list_next(&fp->ctf_dtdefs); dtd != NULL; dtd = ntd) {
- ntd = ctf_list_next(dtd);
+ /*
+ * Note, to work properly with reference counting on the dynamic
+ * section, we must delete the list in reverse.
+ */
+ for (dtd = ctf_list_prev(&fp->ctf_dtdefs); dtd != NULL; dtd = ntd) {
+ ntd = ctf_list_prev(dtd);
ctf_dtd_delete(fp, dtd);
}