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 * 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 * 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 "\\{\[ \t\r\n\]*\[ \t\r\n\]*\\}.*$gdb_prompt $" { + pass $name + } + -re "libfield_empty.*$gdb_prompt $" { + fail $name + } + } + + + # <1>: Abbrev Number: 3 (DW_TAG_structure_type) + # DW_AT_sibling : + # DW_AT_name : libtype_filled + # DW_AT_byte_size : 4 + # DW_AT_decl_file : 1 + # DW_AT_decl_line : 29 + # <2>: Abbrev Number: 4 (DW_TAG_member) + # DW_AT_name : mainfield_filled + # DW_AT_decl_file : 1 + # DW_AT_decl_line : 30 + # DW_AT_type : + # 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