https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=233716
http://sources.redhat.com/ml/gdb-patches/2007-03/msg00129.html
2007-03-12 Jan Kratochvil <jan.kratochvil@redhat.com>
* gdbtypes.h (TYPE_FLAG_STUB_SUPPORTED, TYPE_STUB_SUPPORTED): New
macros.
(TYPE_IS_OPAQUE): Empty vs. opaque structures are now
distinct on the TYPE_STUB_SUPPORTED debug targets.
* dwarf2read.c (read_structure_type): Set TYPE_FLAG_STUB_SUPPORTED.
* dwarfread.c (struct_type): New comment on TYPE_FLAG_STUB_SUPPORTED.
2007-03-12 Jan Kratochvil <jan.kratochvil@redhat.com>
* gdb.base/type-opaque-lib.c, gdb.base/type-opaque-main.c,
gdb.base/type-opaque.exp: New files.
--- ./gdb/dwarf2read.c 12 Feb 2007 15:19:31 -0000 1.215
+++ ./gdb/dwarf2read.c 12 Mar 2007 21:33:06 -0000
@@ -3879,6 +3879,7 @@ read_structure_type (struct die_info *di
TYPE_LENGTH (type) = 0;
}
+ TYPE_FLAGS (type) |= TYPE_FLAG_STUB_SUPPORTED;
if (die_is_declaration (die, cu))
TYPE_FLAGS (type) |= TYPE_FLAG_STUB;
--- ./gdb/dwarfread.c 12 Feb 2007 15:19:31 -0000 1.47
+++ ./gdb/dwarfread.c 12 Mar 2007 21:33:07 -0000
@@ -1083,7 +1083,10 @@ struct_type (struct dieinfo *dip, char *
not even have any fields, if this DIE was generated due to a reference
to an anonymous structure or union. In this case, TYPE_FLAG_STUB is
set, which clues gdb in to the fact that it needs to search elsewhere
- for the full structure definition. */
+ for the full structure definition.
+ As such opaque reference is not distinguishable from an empty STRUCT
+ definition as DWARF1 is missing DW_AT_declaration we cannot set
+ TYPE_FLAG_STUB_SUPPORTED here. */
if (nfields == 0)
{
TYPE_FLAGS (type) |= TYPE_FLAG_STUB;
--- ./gdb/gdbtypes.h 29 Jan 2007 17:31:06 -0000 1.68
+++ ./gdb/gdbtypes.h 12 Mar 2007 21:33:08 -0000
@@ -319,6 +319,14 @@ enum type_code
#define TYPE_FLAG_FIXED_INSTANCE (1 << 15)
+/* This debug target supports TYPE_STUB(t). In the unsupported case we have to
+ rely on NFIELDS to be zero etc., see TYPE_IS_OPAQUE ().
+ TYPE_STUB(t) with !TYPE_STUB_SUPPORTED(t) may exist if we only guessed
+ the TYPE_STUB(t) value (see dwarfread.c). */
+
+#define TYPE_FLAG_STUB_SUPPORTED (1 << 16)
+#define TYPE_STUB_SUPPORTED(t) (TYPE_FLAGS (t) & TYPE_FLAG_STUB_SUPPORTED)
+
/* Array bound type. */
enum array_bound_type
{
@@ -969,7 +977,8 @@ extern void allocate_cplus_struct_type (
#define TYPE_IS_OPAQUE(thistype) (((TYPE_CODE (thistype) == TYPE_CODE_STRUCT) || \
(TYPE_CODE (thistype) == TYPE_CODE_UNION)) && \
(TYPE_NFIELDS (thistype) == 0) && \
- (TYPE_CPLUS_SPECIFIC (thistype) && (TYPE_NFN_FIELDS (thistype) == 0)))
+ (TYPE_CPLUS_SPECIFIC (thistype) && (TYPE_NFN_FIELDS (thistype) == 0)) && \
+ (TYPE_STUB (thistype) || !TYPE_STUB_SUPPORTED (thistype)))
struct builtin_type
{
--- /dev/null 1 Jan 1970 00:00:00 -0000
+++ ./gdb/testsuite/gdb.base/type-opaque-lib.c 12 Mar 2007 21:33:09 -0000
@@ -0,0 +1,56 @@
+/* Test resolving of an opaque type from the loaded shared library.
+
+ Copyright 2007, Free Software Foundation, Inc.
+
+ This file is part of GDB.
+
+ 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 2 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, write to the Free Software
+ Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+struct struct_libtype_opaque
+{
+ int libfield_opaque;
+};
+struct struct_libtype_opaque struct_libtype_opaque_use;
+
+struct struct_libtype_empty
+{
+ int libfield_empty;
+};
+struct struct_libtype_empty struct_libtype_empty_use;
+
+struct struct_libtype_filled
+{
+ int libfield_filled;
+};
+struct struct_libtype_filled struct_libtype_filled_use;
+
+union union_libtype_opaque
+{
+ int libfield_opaque;
+};
+union union_libtype_opaque union_libtype_opaque_use;
+
+union union_libtype_empty
+{
+ int libfield_empty;
+};
+union union_libtype_empty union_libtype_empty_use;
+
+union union_libtype_filled
+{
+ int libfield_filled;
+};
+union union_libtype_filled union_libtype_filled_use;
--- /dev/null 1 Jan 1970 00:00:00 -0000
+++ ./gdb/testsuite/gdb.base/type-opaque-main.c 12 Mar 2007 21:33:09 -0000
@@ -0,0 +1,56 @@
+/* Test resolving of an opaque type from the loaded shared library.
+
+ Copyright 2007, Free Software Foundation, Inc.
+
+ This file is part of GDB.
+
+ 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 2 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, write to the Free Software
+ Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+struct struct_libtype_opaque;
+
+struct struct_libtype_empty
+ {
+ };
+
+struct struct_libtype_filled
+ {
+ long mainfield_filled;
+ };
+
+union union_libtype_opaque;
+
+union union_libtype_empty
+ {
+ };
+
+union union_libtype_filled
+ {
+ long mainfield_filled;
+ };
+
+int main (void)
+{
+ volatile struct struct_libtype_opaque *pointer_struct_opaque = (void *) 0;
+ volatile struct struct_libtype_empty *pointer_struct_empty = (void *) 0;
+ volatile struct struct_libtype_filled *pointer_struct_filled = (void *) 0;
+ volatile union union_libtype_opaque *pointer_union_opaque = (void *) 0;
+ volatile union union_libtype_empty *pointer_union_empty = (void *) 0;
+ volatile union union_libtype_filled *pointer_union_filled = (void *) 0;
+
+ return (long) pointer_struct_opaque + (long) pointer_struct_empty
+ + (long) pointer_struct_filled + (long) pointer_union_opaque
+ + (long) pointer_union_empty + (long) pointer_union_filled;
+}
--- /dev/null 1 Jan 1970 00:00:00 -0000
+++ ./gdb/testsuite/gdb.base/type-opaque.exp 12 Mar 2007 21:33:09 -0000
@@ -0,0 +1,134 @@
+# Copyright 2004, 2007 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 2 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, write to the Free Software
+# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+
+# Please email any bugs, comments, and/or additions to this file to:
+# bug-gdb@prep.ai.mit.edu
+
+# Test resolving of an opaque type from the loaded shared library.
+
+if $tracelevel then {
+ strace $tracelevel
+}
+
+set testfile type-opaque-main
+set libfile type-opaque-lib
+set srcfile ${testfile}.c
+set binfile ${objdir}/${subdir}/${testfile}
+
+set libsrc "${srcdir}/${subdir}/${libfile}.c"
+set libobj "${objdir}/${subdir}/${libfile}.so"
+set execsrc "${srcdir}/${subdir}/${srcfile}"
+
+remote_exec build "rm -f ${binfile}"
+
+# Are we on a target board? No support for downloading shared libraries
+# to a target yet.
+if ![isnative] then {
+ return 0
+}
+
+# get the value of gcc_compiled
+if [get_compiler_info ${binfile}] {
+ return -1
+}
+
+if { [gdb_compile_shlib $libsrc $libobj {debug}] != ""
+ || [gdb_compile $execsrc ${binfile} executable \
+ [list debug shlib=${libobj}]] != "" } {
+ return -1
+}
+
+gdb_exit
+gdb_start
+gdb_reinitialize_dir $srcdir/$subdir
+gdb_load ${binfile}
+
+if ![runto_main] then {
+ fail "Can't run to main"
+ return 0
+}
+
+
+# DWARF3: An incomplete structure, union or class type is represented by
+# a structure, union or class entry that does not have a byte size attribute
+# and that has a DW_AT_declaration attribute.
+
+
+proc body { struct } {
+ global gdb_prompt
+
+
+ # <1><15f>: Abbrev Number: 8 (DW_TAG_structure_type)
+ # DW_AT_name : libtype_opaque
+ # DW_AT_declaration : 1
+
+ set name "opaque $struct type resolving"
+ gdb_test_multiple "ptype pointer_${struct}_opaque" $name \
+ {
+ -re "libfield_opaque.*$gdb_prompt $" {
+ pass $name
+ }
+ }
+
+
+ # <1><9e>: Abbrev Number: 2 (DW_TAG_structure_type)
+ # DW_AT_name : libtype_empty
+ # DW_AT_byte_size : 0
+ # DW_AT_decl_file : 1
+ # DW_AT_decl_line : 25
+
+ set name "empty $struct type resolving"
+ gdb_test_multiple "ptype pointer_${struct}_empty" $name \
+ {
+ -re "\\{\[ \t\r\n\]*<no data fields>\[ \t\r\n\]*\\}.*$gdb_prompt $" {
+ pass $name
+ }
+ -re "libfield_empty.*$gdb_prompt $" {
+ fail $name
+ }
+ }
+
+
+ # <1><b0>: Abbrev Number: 3 (DW_TAG_structure_type)
+ # DW_AT_sibling : <e3>
+ # DW_AT_name : libtype_filled
+ # DW_AT_byte_size : 4
+ # DW_AT_decl_file : 1
+ # DW_AT_decl_line : 29
+ # <2><c7>: Abbrev Number: 4 (DW_TAG_member)
+ # DW_AT_name : mainfield_filled
+ # DW_AT_decl_file : 1
+ # DW_AT_decl_line : 30
+ # DW_AT_type : <e3>
+ # DW_AT_data_member_location: 2 byte block: 23 0 (DW_OP_plus_uconst: 0)
+
+ set name "filled $struct type resolving"
+ gdb_test_multiple "ptype pointer_${struct}_filled" $name \
+ {
+ -re "mainfield_filled.*$gdb_prompt $" {
+ pass $name
+ }
+ -re "libfield_filled.*$gdb_prompt $" {
+ fail $name
+ }
+ }
+
+
+}
+
+
+body struct
+body union