[PATCH V5] CTF: multi-CU and archive support

Weimin Pan via Gdb-patches
2021-05-18T00:21:11Z

[Changes from V4:
- Treat CTF archives as CUs over dependencies to avoid over-expanding
psymtabs, as Tom Tromey pointed out.
- Avoid calling ctf_dict_close more than once on a dictionary.]

Now gdb is capable of debugging executable, which consists of multiple
compilation units (CUs) with the CTF debug info. An executable could
potentially have one or more archives, which, in CTF context, contain
conflicting types.

all changes were made in ctfread.c in which elfctf_build_psymtabs was
modified to handle archives, via the ctf archive iterator and its callback
build_ctf_archive_member and scan_partial_symbols was modified to scan
archives, which are treated as subfiles, to build the psymtabs.

Also changes were made to handle CTF's data object section and function
info section which now share the same format of their contents - an array
of type IDs. New functions ctf_psymtab_add_stt_entries, which is called by
ctf_psymtab_add_stt_obj and ctf_psymtab_add_stt_func, and add_stt_entries,
which is called by add_stt_obj and add_stt_func when setting up psymtabs
and full symtab, respectively.
---
gdb/ctfread.c | 311 +++++++++++++++++-------------
gdb/testsuite/gdb.ctf/cross-tu-cyclic-1.c | 18 ++
gdb/testsuite/gdb.ctf/cross-tu-cyclic-2.c | 16 ++
gdb/testsuite/gdb.ctf/cross-tu-cyclic-3.c | 3 +
gdb/testsuite/gdb.ctf/cross-tu-cyclic-4.c | 4 +
gdb/testsuite/gdb.ctf/cross-tu-cyclic.exp | 43 +++++
gdb/testsuite/gdb.ctf/ctf-a.c | 32 +++
gdb/testsuite/gdb.ctf/ctf-a.h | 22 +++
gdb/testsuite/gdb.ctf/ctf-b.c | 25 +++
gdb/testsuite/gdb.ctf/ctf-b.h | 22 +++
gdb/testsuite/gdb.ctf/ctf-c.c | 25 +++
gdb/testsuite/gdb.ctf/ctf-c.h | 21 ++
gdb/testsuite/gdb.ctf/multi.exp | 42 ++++
13 files changed, 453 insertions(+), 131 deletions(-)
create mode 100644 gdb/testsuite/gdb.ctf/cross-tu-cyclic-1.c
create mode 100644 gdb/testsuite/gdb.ctf/cross-tu-cyclic-2.c
create mode 100644 gdb/testsuite/gdb.ctf/cross-tu-cyclic-3.c
create mode 100644 gdb/testsuite/gdb.ctf/cross-tu-cyclic-4.c
create mode 100644 gdb/testsuite/gdb.ctf/cross-tu-cyclic.exp
create mode 100644 gdb/testsuite/gdb.ctf/ctf-a.c
create mode 100644 gdb/testsuite/gdb.ctf/ctf-a.h
create mode 100644 gdb/testsuite/gdb.ctf/ctf-b.c
create mode 100644 gdb/testsuite/gdb.ctf/ctf-b.h
create mode 100644 gdb/testsuite/gdb.ctf/ctf-c.c
create mode 100644 gdb/testsuite/gdb.ctf/ctf-c.h
create mode 100644 gdb/testsuite/gdb.ctf/multi.exp

diff --git a/gdb/ctfread.c b/gdb/ctfread.c
index 23e859a..1939f40 100644
--- a/gdb/ctfread.c
+++ b/gdb/ctfread.c
@@ -117,6 +117,7 @@ struct ctf_context
struct objfile *of;
psymtab_storage *partial_symtabs;
partial_symtab *pst;
+ ctf_archive_t *arc;
struct buildsym_compunit *builder;
};

@@ -166,6 +167,16 @@ struct ctf_field_info
std::vector<struct decl_field> nested_types_list;
};

+/* Data held for a translation unit. */
+
+struct ctf_per_tu_data
+{
+ ctf_dict_t *fp;
+ struct objfile *of;
+ ctf_archive_t *arc;
+ psymtab_storage *pss;
+ psymbol_functions *psf;
+};

/* Local function prototypes */

@@ -245,10 +256,8 @@ struct ctf_tid_and_type
ids.tid = tid;
ids.type = typ;
slot = (struct ctf_tid_and_type **) htab_find_slot (htab, &ids, INSERT);
- if (*slot)
- complaint (_("An internal GDB problem: ctf_ id_t %ld type already set"),
- (tid));
- *slot = XOBNEW (&of->objfile_obstack, struct ctf_tid_and_type);
+ if (*slot == nullptr)
+ *slot = XOBNEW (&of->objfile_obstack, struct ctf_tid_and_type);
**slot = ids;
return typ;
}
@@ -510,7 +519,7 @@ struct ctf_tid_and_type
break;
}

- add_symbol_to_list (sym, ccp->builder->get_global_symbols ());
+ add_symbol_to_list (sym, ccp->builder->get_file_symbols ());
}

return sym;
@@ -1143,7 +1152,8 @@ struct ctf_tid_and_type
if (type)
{
sym = new_symbol (ccp, type, id);
- sym->compute_and_set_names (name, false, ccp->of->per_bfd);
+ if (sym)
+ sym->compute_and_set_names (name, false, ccp->of->per_bfd);
}
break;
case CTF_K_STRUCT:
@@ -1160,7 +1170,7 @@ struct ctf_tid_and_type
SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
sym->compute_and_set_names (name, false, ccp->of->per_bfd);
- add_symbol_to_list (sym, ccp->builder->get_global_symbols ());
+ add_symbol_to_list (sym, ccp->builder->get_file_symbols ());
break;
default:
complaint (_("ctf_add_var_cb: kind unsupported (%d)"), kind);
@@ -1173,81 +1183,48 @@ struct ctf_tid_and_type
return 0;
}

-/* Add an ELF STT_OBJ symbol with index IDX to the symbol table. */
+/* Add entries in either data objects or function info section, controlled
+ by FUNCTIONS. */

-static struct symbol *
-add_stt_obj (struct ctf_context *ccp, unsigned long idx)
+static void
+add_stt_entries (struct ctf_context *ccp, int functions)
{
- struct symbol *sym;
- struct type *type;
+ ctf_next_t *i = nullptr;
+ const char *tname;
ctf_id_t tid;
+ struct symbol *sym = nullptr;
+ struct type *type;

- if ((tid = ctf_lookup_by_symbol (ccp->fp, idx)) == CTF_ERR)
- return nullptr;
-
- type = fetch_tid_type (ccp, tid);
- if (type == nullptr)
- return nullptr;
-
- sym = new_symbol (ccp, type, tid);
-
- return sym;
+ while ((tid = ctf_symbol_next (ccp->fp, &i, &tname, functions)) != CTF_ERR)
+ {
+ type = get_tid_type (ccp->of, tid);
+ if (type == nullptr)
+ continue;
+ sym = new (&ccp->of->objfile_obstack) symbol;
+ OBJSTAT (ccp->of, n_syms++);
+ SYMBOL_TYPE (sym) = type;
+ SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
+ SYMBOL_ACLASS_INDEX (sym) = LOC_STATIC;
+ sym->compute_and_set_names (tname, false, ccp->of->per_bfd);
+ add_symbol_to_list (sym, ccp->builder->get_global_symbols ());
+ set_symbol_address (ccp->of, sym, tname);
+ }
}

-/* Add an ELF STT_FUNC symbol with index IDX to the symbol table. */
+/* Add entries in data objects section. */

-static struct symbol *
-add_stt_func (struct ctf_context *ccp, unsigned long idx)
+static void
+add_stt_obj (struct ctf_context *ccp)
{
- struct type *ftype, *atyp, *rettyp;
- struct symbol *sym;
- ctf_funcinfo_t finfo;
- ctf_id_t argv[32];
- uint32_t argc;
- ctf_id_t tid;
- struct type *void_type = objfile_type (ccp->of)->builtin_void;
-
- if (ctf_func_info (ccp->fp, idx, &finfo) == CTF_ERR)
- return nullptr;
-
- argc = finfo.ctc_argc;
- if (ctf_func_args (ccp->fp, idx, argc, argv) == CTF_ERR)
- return nullptr;
-
- gdb::unique_xmalloc_ptr<char> name (ctf_type_aname_raw (ccp->fp, idx));
- if (name == nullptr)
- return nullptr;
-
- tid = ctf_lookup_by_symbol (ccp->fp, idx);
- ftype = fetch_tid_type (ccp, tid);
- if ((finfo.ctc_flags & CTF_FUNC_VARARG) != 0)
- ftype->set_has_varargs (true);
- ftype->set_num_fields (argc);
-
- /* If argc is 0, it has a "void" type. */
- if (argc != 0)
- ftype->set_fields
- ((struct field *) TYPE_ZALLOC (ftype, argc * sizeof (struct field)));
-
- /* TYPE_FIELD_TYPE must never be NULL. Fill it with void_type, if failed
- to find the argument type. */
- for (int iparam = 0; iparam < argc; iparam++)
- {
- atyp = fetch_tid_type (ccp, argv[iparam]);
- if (atyp)
- ftype->field (iparam).set_type (atyp);
- else
- ftype->field (iparam).set_type (void_type);
- }
+ add_stt_entries (ccp, 0);
+}

- sym = new_symbol (ccp, ftype, tid);
- rettyp = fetch_tid_type (ccp, finfo.ctc_return);
- if (rettyp != nullptr)
- SYMBOL_TYPE (sym) = rettyp;
- else
- SYMBOL_TYPE (sym) = void_type;
+/* Add entries in function info section. */

- return sym;
+static void
+add_stt_func (struct ctf_context *ccp)
+{
+ add_stt_entries (ccp, 1);
}

/* Get text segment base for OBJFILE, TSIZE contains the segment size. */
@@ -1317,12 +1294,71 @@ struct ctf_tid_and_type
ctf_errmsg (ctf_errno (ccp->fp)));
}

+/* Add entries in either data objects or function info section, controlled
+ by FUNCTIONS, to psymtab. */
+
+static void
+ctf_psymtab_add_stt_entries (ctf_dict_t *cfp, ctf_psymtab *pst,
+ struct objfile *of, int functions)
+{
+ ctf_next_t *i = nullptr;
+ ctf_id_t tid;
+ const char *tname;
+
+ while ((tid = ctf_symbol_next (cfp, &i, &tname, functions)) != CTF_ERR)
+ {
+ uint32_t kind = ctf_type_kind (cfp, tid);
+ address_class aclass;
+ domain_enum tdomain;
+ switch (kind)
+ {
+ case CTF_K_STRUCT:
+ case CTF_K_UNION:
+ case CTF_K_ENUM:
+ tdomain = STRUCT_DOMAIN;
+ break;
+ default:
+ tdomain = VAR_DOMAIN;
+ break;
+ }
+
+ if (kind == CTF_K_FUNCTION)
+ aclass = LOC_STATIC;
+ else if (kind == CTF_K_CONST)
+ aclass = LOC_CONST;
+ else
+ aclass = LOC_TYPEDEF;
+
+ pst->add_psymbol (tname, true,
+ tdomain, aclass, -1,
+ psymbol_placement::GLOBAL,
+ 0, language_c, pst->context->partial_symtabs, of);
+ }
+}
+
+/* Add entries in data objects section to psymtab. */
+
+static void
+ctf_psymtab_add_stt_obj (ctf_dict_t *cfp, ctf_psymtab *pst,
+ struct objfile *of)
+{
+ ctf_psymtab_add_stt_entries (cfp, pst, of, 0);
+}
+
+/* Add entries in function info section to psymtab. */
+
+static void
+ctf_psymtab_add_stt_func (ctf_dict_t *cfp, ctf_psymtab *pst,
+ struct objfile *of)
+{
+ ctf_psymtab_add_stt_entries (cfp, pst, of, 1);
+}
+
/* Read in full symbols for PST, and anything it depends on. */

void
ctf_psymtab::expand_psymtab (struct objfile *objfile)
{
- struct symbol *sym;
struct ctf_context *ccp;

gdb_assert (!readin);
@@ -1341,21 +1377,8 @@ struct ctf_tid_and_type
ctf_errmsg (ctf_errno (ccp->fp)));

/* Add entries in data objects and function info sections. */
- for (unsigned long i = 0; ; i++)
- {
- sym = add_stt_obj (ccp, i);
- if (sym == nullptr)
- {
- if (ctf_errno (ccp->fp) == EINVAL
- || ctf_errno (ccp->fp) == ECTF_NOSYMTAB)
- break;
- sym = add_stt_func (ccp, i);
- }
- if (sym == nullptr)
- continue;
-
- set_symbol_address (ccp->of, sym, sym->linkage_name ());
- }
+ add_stt_obj (ccp);
+ add_stt_func (ccp);

readin = true;
}
@@ -1409,6 +1432,7 @@ struct ctf_tid_and_type

static ctf_psymtab *
create_partial_symtab (const char *name,
+ ctf_archive_t *arc,
ctf_dict_t *cfp,
psymtab_storage *partial_symtabs,
struct objfile *objfile)
@@ -1419,11 +1443,12 @@ struct ctf_tid_and_type
pst = new ctf_psymtab (name, partial_symtabs, objfile->per_bfd, 0);

ccx = XOBNEW (&objfile->objfile_obstack, struct ctf_context);
+ ccx->arc = arc;
ccx->fp = cfp;
+ ctf_ref (cfp);
ccx->of = objfile;
ccx->partial_symtabs = partial_symtabs;
ccx->pst = pst;
- ccx->builder = nullptr;
pst->context = ccx;

return pst;
@@ -1486,7 +1511,7 @@ struct ctf_tid_and_type

ccp->pst->add_psymbol (name, false,
domain, aclass, section,
- psymbol_placement::GLOBAL,
+ psymbol_placement::STATIC,
0, language_c, ccp->partial_symtabs, ccp->of);

return 0;
@@ -1506,18 +1531,46 @@ struct ctf_tid_and_type
return 0;
}

+/* Start a subfile for CTF. FNAME is the name of the archive. */
+
+static void
+ctf_start_archive (struct ctf_context *ccx, struct objfile *of,
+ const char *fname)
+{
+ if (ccx->builder == nullptr)
+ {
+ ccx->builder = new buildsym_compunit (of,
+ of->original_name, nullptr, language_c, 0);
+ ccx->builder->record_debugformat ("ctf");
+ }
+ ccx->builder->start_subfile (fname);
+}
+
/* Setup partial_symtab's describing each source file for which
debugging information is available. */

static void
scan_partial_symbols (ctf_dict_t *cfp, psymtab_storage *partial_symtabs,
- struct objfile *of)
+ struct ctf_per_tu_data *tup, const char *fname)
{
- bfd *abfd = of->obfd;
- const char *name = bfd_get_filename (abfd);
- ctf_psymtab *pst = create_partial_symtab (name, cfp, partial_symtabs, of);
+ struct objfile *of = tup->of;
+ bool isparent = false;
+
+ if (strcmp (fname, ".ctf") == 0)
+ {
+ fname = bfd_get_filename (of->obfd);
+ isparent = true;
+ }
+
+ ctf_psymtab *pst = create_partial_symtab (fname, tup->arc, cfp,
+ partial_symtabs, of);

struct ctf_context *ccx = pst->context;
+ if (isparent == false)
+ {
+ ctf_start_archive (ccx, of, fname);
+ ccx->pst = pst;
+ }

if (ctf_type_iter (cfp, ctf_psymtab_type_cb, ccx) == CTF_ERR)
complaint (_("ctf_type_iter scan_partial_symbols failed - %s"),
@@ -1530,46 +1583,33 @@ struct ctf_tid_and_type
/* Scan CTF object and function sections which correspond to each
STT_FUNC or STT_OBJECT entry in the symbol table,
pick up what init_symtab has done. */
- for (unsigned long idx = 0; ; idx++)
- {
- ctf_id_t tid;
- if ((tid = ctf_lookup_by_symbol (cfp, idx)) == CTF_ERR)
- {
- if (ctf_errno (cfp) == EINVAL || ctf_errno (cfp) == ECTF_NOSYMTAB)
- break; // Done, reach end of the section.
- else
- continue;
- }
- const char *tname = ctf_type_name_raw (cfp, tid);
- uint32_t kind = ctf_type_kind (cfp, tid);
- address_class aclass;
- domain_enum tdomain;
- switch (kind)
- {
- case CTF_K_STRUCT:
- case CTF_K_UNION:
- case CTF_K_ENUM:
- tdomain = STRUCT_DOMAIN;
- break;
- default:
- tdomain = VAR_DOMAIN;
- break;
- }
+ ctf_psymtab_add_stt_obj (cfp, pst, of);
+ ctf_psymtab_add_stt_func (cfp, pst, of);

- if (kind == CTF_K_FUNCTION)
- aclass = LOC_STATIC;
- else if (kind == CTF_K_CONST)
- aclass = LOC_CONST;
- else
- aclass = LOC_TYPEDEF;
+ pst->end ();
+}

- pst->add_psymbol (tname, false,
- tdomain, aclass, -1,
- psymbol_placement::STATIC,
- 0, language_c, partial_symtabs, of);
+/* Callback to build the psymtab for archive member NAME. */
+
+static int
+build_ctf_archive_member (ctf_dict_t *ctf, const char *name, void *arg)
+{
+ struct ctf_per_tu_data *tup = (struct ctf_per_tu_data *) arg;
+ ctf_dict_t *parent = tup->fp;
+
+ if (strcmp (name, ".ctf") != 0)
+ ctf_import (ctf, parent);
+
+ if (info_verbose)
+ {
+ printf_filtered (_("Scanning archive member %s..."), name);
+ gdb_flush (gdb_stdout);
}

- pst->end ();
+ psymtab_storage *pss = tup->psf->get_partial_symtabs ().get ();
+ scan_partial_symbols (ctf, pss, tup, name);
+
+ return 0;
}

/* Read CTF debugging information from a BFD section. This is
@@ -1579,6 +1619,7 @@ struct ctf_tid_and_type
void
elfctf_build_psymtabs (struct objfile *of)
{
+ struct ctf_per_tu_data pcu;
bfd *abfd = of->obfd;
int err;

@@ -1593,10 +1634,18 @@ struct ctf_tid_and_type
bfd_get_filename (abfd), ctf_errmsg (err));
ctf_dict_key.emplace (of, fp);

+ pcu.fp = fp;
+ pcu.of = of;
+ pcu.arc = arc;
+
psymbol_functions *psf = new psymbol_functions ();
psymtab_storage *partial_symtabs = psf->get_partial_symtabs ().get ();
of->qf.emplace_front (psf);
- scan_partial_symbols (fp, partial_symtabs, of);
+ pcu.psf = psf;
+
+ if (ctf_archive_iter (arc, build_ctf_archive_member, &pcu) < 0)
+ error (_("ctf_archive_iter failed in input file %s: - %s"),
+ bfd_get_filename (abfd), ctf_errmsg (err));
}

#else
diff --git a/gdb/testsuite/gdb.ctf/cross-tu-cyclic-1.c b/gdb/testsuite/gdb.ctf/cross-tu-cyclic-1.c
new file mode 100644
index 0000000..fe52b9e
--- /dev/null
+++ b/gdb/testsuite/gdb.ctf/cross-tu-cyclic-1.c
@@ -0,0 +1,18 @@
+struct A;
+struct B
+{
+ int foo;
+ struct A *bar;
+};
+
+struct A
+{
+ long a;
+ struct B *foo;
+};
+
+static struct A *foo __attribute__((used));
+
+int main()
+{
+}
diff --git a/gdb/testsuite/gdb.ctf/cross-tu-cyclic-2.c b/gdb/testsuite/gdb.ctf/cross-tu-cyclic-2.c
new file mode 100644
index 0000000..aa2d177
--- /dev/null
+++ b/gdb/testsuite/gdb.ctf/cross-tu-cyclic-2.c
@@ -0,0 +1,16 @@
+struct B;
+struct A
+{
+ long a;
+ struct B *foo;
+ struct C *bar;
+};
+
+struct C
+{
+ struct B *foo;
+ int b;
+};
+
+static struct C *foo __attribute__((used));
+static struct A *bar __attribute__((used));
diff --git a/gdb/testsuite/gdb.ctf/cross-tu-cyclic-3.c b/gdb/testsuite/gdb.ctf/cross-tu-cyclic-3.c
new file mode 100644
index 0000000..19947e8
--- /dev/null
+++ b/gdb/testsuite/gdb.ctf/cross-tu-cyclic-3.c
@@ -0,0 +1,3 @@
+struct A { struct B *foo; };
+static struct A *a __attribute__((__used__));
+static struct A *conflicty __attribute__((__used__));
diff --git a/gdb/testsuite/gdb.ctf/cross-tu-cyclic-4.c b/gdb/testsuite/gdb.ctf/cross-tu-cyclic-4.c
new file mode 100644
index 0000000..6e0c957
--- /dev/null
+++ b/gdb/testsuite/gdb.ctf/cross-tu-cyclic-4.c
@@ -0,0 +1,4 @@
+struct A { struct B *foo; };
+struct B { struct B *next; };
+static struct A *a __attribute__((__used__));
+static struct B *conflicty __attribute__((__used__));
diff --git a/gdb/testsuite/gdb.ctf/cross-tu-cyclic.exp b/gdb/testsuite/gdb.ctf/cross-tu-cyclic.exp
new file mode 100644
index 0000000..b6e640e
--- /dev/null
+++ b/gdb/testsuite/gdb.ctf/cross-tu-cyclic.exp
@@ -0,0 +1,43 @@
+# Copyright 2021 Free Software Foundation, Inc.
+
+# This program 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 of the License, 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. If not, see <http://www.gnu.org/licenses/>.
+
+# This file is a subset of ptype.exp written by Rob Savoye. (rob@cygnus.com)
+
+if [skip_ctf_tests] {
+ unsupported "no CTF debug format support, or CTF disabled in GDB"
+ return 0
+}
+
+standard_testfile cross-tu-cyclic-1.c cross-tu-cyclic-2.c \
+ cross-tu-cyclic-3.c cross-tu-cyclic-4.c
+
+# Using `-gt` generates full-fledged CTF debug information.
+set opts "additional_flags=-gt -Wl,--export-dynamic"
+if { [prepare_for_testing "failed to prepare" ${testfile} \
+ [list $srcfile $srcfile2 $srcfile3 $srcfile4] \
+ [list $opts nowarnings]] } {
+ return 0
+}
+
+# Create and source the file that provides information about the compiler
+# used to compile the test case.
+if [get_compiler_info] {
+ return -1
+}
+
+# Same thing with struct and union.
+gdb_test "ptype struct A" "type = struct A \{\[\r\n\]+\[ \t\]+struct B \\*foo;\[\r\n\]+\}.*" "ptype structure A"
+gdb_test "ptype struct B" "type = struct B \{\[\r\n\]+\[ \t\]+struct B \\*next;\[\r\n\]+\}.*" "ptype structure B"
+gdb_test "ptype struct C" "type = struct C \{\[\r\n\]+\[ \t\]+struct B \\*foo;\[\r\n\]+\[ \t\]+int b;\[\r\n\]+\}.*" "ptype structure C"
diff --git a/gdb/testsuite/gdb.ctf/ctf-a.c b/gdb/testsuite/gdb.ctf/ctf-a.c
new file mode 100644
index 0000000..9aa2a8f
--- /dev/null
+++ b/gdb/testsuite/gdb.ctf/ctf-a.c
@@ -0,0 +1,32 @@
+/* This test program is part of GDB, the GNU debugger.
+
+ Copyright 2021 Free Software Foundation, Inc.
+
+ This program 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 of the License, 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. If not, see <http://www.gnu.org/licenses/>. */
+
+#include "ctf-a.h"
+
+static struct A a __attribute__((used));
+
+extern struct C *foo ();
+extern int bar ();
+
+int main ()
+{
+ struct C *cp;
+ cp = foo ();
+ if (cp)
+ return bar ();
+ return 0;
+}
diff --git a/gdb/testsuite/gdb.ctf/ctf-a.h b/gdb/testsuite/gdb.ctf/ctf-a.h
new file mode 100644
index 0000000..297d740
--- /dev/null
+++ b/gdb/testsuite/gdb.ctf/ctf-a.h
@@ -0,0 +1,22 @@
+/* This test program is part of GDB, the GNU debugger.
+
+ Copyright 2021 Free Software Foundation, Inc.
+
+ This program 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 of the License, 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. If not, see <http://www.gnu.org/licenses/>. */
+
+struct A {
+ struct B *b;
+ struct A *next;
+};
+
diff --git a/gdb/testsuite/gdb.ctf/ctf-b.c b/gdb/testsuite/gdb.ctf/ctf-b.c
new file mode 100644
index 0000000..c3a8ce5
--- /dev/null
+++ b/gdb/testsuite/gdb.ctf/ctf-b.c
@@ -0,0 +1,25 @@
+/* This test program is part of GDB, the GNU debugger.
+
+ Copyright 2021 Free Software Foundation, Inc.
+
+ This program 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 of the License, 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. If not, see <http://www.gnu.org/licenses/>. */
+
+#include "ctf-b.h"
+
+static struct B b __attribute__((used));
+
+int bar ()
+{
+ return b.wombat;
+}
diff --git a/gdb/testsuite/gdb.ctf/ctf-b.h b/gdb/testsuite/gdb.ctf/ctf-b.h
new file mode 100644
index 0000000..9dbdd7d
--- /dev/null
+++ b/gdb/testsuite/gdb.ctf/ctf-b.h
@@ -0,0 +1,22 @@
+/* This test program is part of GDB, the GNU debugger.
+
+ Copyright 2021 Free Software Foundation, Inc.
+
+ This program 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 of the License, 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. If not, see <http://www.gnu.org/licenses/>. */
+
+struct B {
+ struct C *c;
+ int wombat;
+};
+
diff --git a/gdb/testsuite/gdb.ctf/ctf-c.c b/gdb/testsuite/gdb.ctf/ctf-c.c
new file mode 100644
index 0000000..b4051b3
--- /dev/null
+++ b/gdb/testsuite/gdb.ctf/ctf-c.c
@@ -0,0 +1,25 @@
+/* This test program is part of GDB, the GNU debugger.
+
+ Copyright 2021 Free Software Foundation, Inc.
+
+ This program 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 of the License, 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. If not, see <http://www.gnu.org/licenses/>. */
+
+#include "ctf-c.h"
+
+static struct C c __attribute__((used));
+
+struct C * foo ()
+{
+ return &c;
+}
diff --git a/gdb/testsuite/gdb.ctf/ctf-c.h b/gdb/testsuite/gdb.ctf/ctf-c.h
new file mode 100644
index 0000000..fb18157
--- /dev/null
+++ b/gdb/testsuite/gdb.ctf/ctf-c.h
@@ -0,0 +1,21 @@
+/* This test program is part of GDB, the GNU debugger.
+
+ Copyright 2021 Free Software Foundation, Inc.
+
+ This program 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 of the License, 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. If not, see <http://www.gnu.org/licenses/>. */
+
+struct C {
+ struct A *a;
+ int b;
+};
diff --git a/gdb/testsuite/gdb.ctf/multi.exp b/gdb/testsuite/gdb.ctf/multi.exp
new file mode 100644
index 0000000..973115e
--- /dev/null
+++ b/gdb/testsuite/gdb.ctf/multi.exp
@@ -0,0 +1,42 @@
+# Copyright 2021 Free Software Foundation, Inc.
+
+# This program 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 of the License, 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. If not, see <http://www.gnu.org/licenses/>.
+
+# This file is a subset of ptype.exp written by Rob Savoye. (rob@cygnus.com)
+
+if [skip_ctf_tests] {
+ unsupported "no CTF debug format support, or CTF disabled in GDB"
+ return 0
+}
+
+standard_testfile ctf-a.c ctf-b.c ctf-c.c
+
+# Using `-gt` generates full-fledged CTF debug information.
+set opts "additional_flags=-gt -Wl,--export-dynamic"
+if { [prepare_for_testing "failed to prepare" ${testfile} \
+ [list $srcfile $srcfile2 $srcfile3] \
+ [list $opts nowarnings]] } {
+ return 0
+}
+
+# Create and source the file that provides information about the compiler
+# used to compile the test case.
+if [get_compiler_info] {
+ return -1
+}
+
+# Same thing with struct and union.
+gdb_test "ptype struct A" "type = struct A \{\[\r\n\]+\[ \t\]+struct B \\*b;\[\r\n\]+\[ \t\]+struct A \\*next;\[\r\n\]+\}.*" "ptype structure A"
+gdb_test "ptype struct B" "type = struct B \{\[\r\n\]+\[ \t\]+struct C \\*c;\[\r\n\]+\[ \t\]+int \\wombat;\[\r\n\]+\}.*" "ptype structure B"
+gdb_test "ptype struct C" "type = struct C \{\[\r\n\]+\[ \t\]+struct A \\*a;\[\r\n\]+\[ \t\]+int b;\[\r\n\]+\}.*" "ptype structure C"
--
1.8.3.1