Add support for the GNU V3 C++ ABI.
(Includes changes by Dan Berlin.) * gnu-v3-abi.c: New file. * minsyms.c: #include "value.h" and "cp-abi.h". (install_minimal_symbols): Check the minimal symbol table for symbols that look mangled in the V3 style, and select the V3 ABI if we find any. * Makefile.in (SFILES): Add gnu-v3-abi.c. (COMMON_OBS): Add gnu-v3-abi.o. (gnu-v3-abi.o): Add new rule. (minsyms.o): Depend on $(cp_abi_h) and $(value_h).
This commit is contained in:
parent
506eee2253
commit
7ed49443c2
4 changed files with 393 additions and 4 deletions
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@ -1,3 +1,18 @@
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2001-05-22 Jim Blandy <jimb@redhat.com>
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Add support for the GNU V3 C++ ABI.
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(Includes changes by Dan Berlin.)
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* gnu-v3-abi.c: New file.
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* minsyms.c: #include "value.h" and "cp-abi.h".
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(install_minimal_symbols): Check the minimal symbol table for
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symbols that look mangled in the V3 style, and select the V3 ABI
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if we find any.
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* Makefile.in (SFILES): Add gnu-v3-abi.c.
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(COMMON_OBS): Add gnu-v3-abi.o.
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(gnu-v3-abi.o): Add new rule.
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(minsyms.o): Depend on $(cp_abi_h) and $(value_h).
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2001-05-21 Jim Blandy <jimb@redhat.com>
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* values.c (value_primitive_field): If we're extracting a base
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@ -541,7 +541,7 @@ SFILES = ax-general.c ax-gdb.c bcache.c blockframe.c breakpoint.c \
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tui/tui-file.h tui/tui-file.c \
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ui-file.h ui-file.c \
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frame.c \
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gnu-v2-abi.c hpacc-abi.c cp-abi.c
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gnu-v2-abi.c gnu-v3-abi.c hpacc-abi.c cp-abi.c
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LINTFILES = $(SFILES) $(YYFILES) $(CONFIG_SRCS) init.c
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@ -695,7 +695,7 @@ COMMON_OBS = version.o blockframe.o breakpoint.o findvar.o regcache.o \
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nlmread.o serial.o mdebugread.o os9kread.o top.o utils.o \
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ui-file.o tui-file.o \
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frame.o \
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gnu-v2-abi.o hpacc-abi.o cp-abi.o
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gnu-v2-abi.o gnu-v3-abi.o hpacc-abi.o cp-abi.o
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OBS = $(COMMON_OBS) $(ANNOTATE_OBS)
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@ -1495,6 +1495,8 @@ gnu-nat.o: process_reply_S.h exc_request_S.h notify_S.h msg_reply_S.h \
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gnu-v2-abi.o: gnu-v2-abi.c $(defs_h) $(gdb_string_h) $(symtab_h) \
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$(gdbtypes_h) $(value_h) $(demangle_h) $(cp_abi_h)
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gnu-v3-abi.o: gnu-v2-abi.c $(defs_h) $(value_h) $(cp_abi_h) $(demangle_h)
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h8300-tdep.o: h8300-tdep.c $(defs_h) $(frame_h) $(symtab_h) $(regcache_h)
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h8500-tdep.o: h8500-tdep.c $(bfd_h) $(dis-asm_h) $(defs_h) \
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@ -1679,7 +1681,7 @@ os9kread.o: os9kread.c buildsym.h complaints.h $(bfd_h) $(defs_h) \
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mem-break.o: mem-break.c $(defs_h)
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minsyms.o: minsyms.c $(bfd_h) $(defs_h) objfiles.h symfile.h \
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$(symtab_h) $(gdb_string_h)
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$(symtab_h) $(gdb_string_h) $(value_h) $(cp_abi_h)
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mips-nat.o: mips-nat.c $(defs_h) $(gdbcore_h) $(inferior_h) $(regcache_h)
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355
gdb/gnu-v3-abi.c
Normal file
355
gdb/gnu-v3-abi.c
Normal file
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@ -0,0 +1,355 @@
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/* Abstraction of GNU v3 abi.
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Contributed by Jim Blandy <jimb@redhat.com>
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Copyright 2001 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "defs.h"
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#include "value.h"
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#include "cp-abi.h"
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#include "demangle.h"
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struct cp_abi_ops gnu_v3_abi_ops;
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static int
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gnuv3_is_vtable_name (const char *name)
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{
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return strncmp (name, "_ZTV", 4) == 0;
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}
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static int
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gnuv3_is_operator_name (const char *name)
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{
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return strncmp (name, "operator", 8) == 0;
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}
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/* To help us find the components of a vtable, we build ourselves a
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GDB type object representing the vtable structure. Following the
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V3 ABI, it goes something like this:
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struct gdb_gnu_v3_abi_vtable {
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/ * An array of virtual call and virtual base offsets. The real
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length of this array depends on the class hierarchy; we use
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negative subscripts to access the elements. Yucky, but
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better than the alternatives. * /
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ptrdiff_t vcall_and_vbase_offsets[0];
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/ * The offset from a virtual pointer referring to this table
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to the top of the complete object. * /
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ptrdiff_t offset_to_top;
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/ * The type_info pointer for this class. This is really a
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std::type_info *, but GDB doesn't really look at the
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type_info object itself, so we don't bother to get the type
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exactly right. * /
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void *type_info;
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/ * Virtual table pointers in objects point here. * /
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/ * Virtual function pointers. Like the vcall/vbase array, the
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real length of this table depends on the class hierarchy. * /
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void (*virtual_functions[0]) ();
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};
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The catch, of course, is that the exact layout of this table
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depends on the ABI --- word size, endianness, alignment, etc. So
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the GDB type object is actually a per-architecture kind of thing.
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vtable_type_gdbarch_data is a gdbarch per-architecture data pointer
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which refers to the struct type * for this structure, laid out
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appropriately for the architecture. */
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struct gdbarch_data *vtable_type_gdbarch_data;
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/* Human-readable names for the numbers of the fields above. */
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enum {
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vtable_field_vcall_and_vbase_offsets,
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vtable_field_offset_to_top,
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vtable_field_type_info,
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vtable_field_virtual_functions
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};
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/* Return a GDB type representing `struct gdb_gnu_v3_abi_vtable',
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described above, laid out appropriately for ARCH.
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We use this function as the gdbarch per-architecture data
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initialization function. We assume that the gdbarch framework
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calls the per-architecture data initialization functions after it
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sets current_gdbarch to the new architecture. */
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static void *
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build_gdb_vtable_type (struct gdbarch *arch)
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{
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struct type *t;
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struct field *field_list, *field;
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int offset;
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struct type *void_ptr_type
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= lookup_pointer_type (builtin_type_void);
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struct type *ptr_to_void_fn_type
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= lookup_pointer_type (lookup_function_type (builtin_type_void));
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/* ARCH can't give us the true ptrdiff_t type, so we guess. */
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struct type *ptrdiff_type
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= init_type (TYPE_CODE_INT, TARGET_PTR_BIT / TARGET_CHAR_BIT, 0,
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"ptrdiff_t", 0);
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/* We assume no padding is necessary, since GDB doesn't know
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anything about alignment at the moment. If this assumption bites
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us, we should add a gdbarch method which, given a type, returns
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the alignment that type requires, and then use that here. */
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/* Build the field list. */
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field_list = xmalloc (sizeof (struct field [4]));
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memset (field_list, 0, sizeof (struct field [4]));
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field = &field_list[0];
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offset = 0;
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/* ptrdiff_t vcall_and_vbase_offsets[0]; */
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FIELD_NAME (*field) = "vcall_and_vbase_offsets";
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FIELD_TYPE (*field)
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= create_array_type (0, ptrdiff_type,
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create_range_type (0, builtin_type_int, 0, -1));
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FIELD_BITPOS (*field) = offset * TARGET_CHAR_BIT;
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offset += TYPE_LENGTH (FIELD_TYPE (*field));
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field++;
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/* ptrdiff_t offset_to_top; */
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FIELD_NAME (*field) = "offset_to_top";
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FIELD_TYPE (*field) = ptrdiff_type;
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FIELD_BITPOS (*field) = offset * TARGET_CHAR_BIT;
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offset += TYPE_LENGTH (FIELD_TYPE (*field));
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field++;
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/* void *type_info; */
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FIELD_NAME (*field) = "type_info";
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FIELD_TYPE (*field) = void_ptr_type;
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FIELD_BITPOS (*field) = offset * TARGET_CHAR_BIT;
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offset += TYPE_LENGTH (FIELD_TYPE (*field));
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field++;
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/* void (*virtual_functions[0]) (); */
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FIELD_NAME (*field) = "virtual_functions";
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FIELD_TYPE (*field)
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= create_array_type (0, ptr_to_void_fn_type,
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create_range_type (0, builtin_type_int, 0, -1));
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FIELD_BITPOS (*field) = offset * TARGET_CHAR_BIT;
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offset += TYPE_LENGTH (FIELD_TYPE (*field));
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field++;
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/* We assumed in the allocation above that there were four fields. */
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if (field != field_list + 4)
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abort ();
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t = init_type (TYPE_CODE_STRUCT, offset, 0, 0, 0);
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TYPE_NFIELDS (t) = field - field_list;
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TYPE_FIELDS (t) = field_list;
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TYPE_TAG_NAME (t) = "gdb_gnu_v3_abi_vtable";
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return t;
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}
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/* Return the offset from the start of the imaginary `struct
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gdb_gnu_v3_abi_vtable' object to the vtable's "address point"
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(i.e., where objects' virtual table pointers point). */
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static int
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vtable_address_point_offset ()
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{
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struct type *vtable_type = gdbarch_data (vtable_type_gdbarch_data);
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return (TYPE_FIELD_BITPOS (vtable_type, vtable_field_virtual_functions)
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/ TARGET_CHAR_BIT);
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}
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static struct type *
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gnuv3_rtti_type (struct value *value,
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int *full_p, int *top_p, int *using_enc_p)
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{
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struct type *vtable_type = gdbarch_data (vtable_type_gdbarch_data);
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struct type *value_type = check_typedef (VALUE_TYPE (value));
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CORE_ADDR vtable_address;
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struct value *vtable;
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struct minimal_symbol *vtable_symbol;
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const char *vtable_symbol_name;
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const char *class_name;
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struct symbol *class_symbol;
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struct type *run_time_type;
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LONGEST offset_to_top;
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/* We only have RTTI for class objects. */
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if (TYPE_CODE (value_type) != TYPE_CODE_CLASS)
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return NULL;
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/* If we can't find the virtual table pointer for value_type, we
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can't find the RTTI. */
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fill_in_vptr_fieldno (value_type);
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if (TYPE_VPTR_FIELDNO (value_type) == -1)
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return NULL;
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/* Fetch VALUE's virtual table pointer, and tweak it to point at
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an instance of our imaginary gdb_gnu_v3_abi_vtable structure. */
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vtable_address
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= value_as_pointer (value_field (value, TYPE_VPTR_FIELDNO (value_type)));
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vtable = value_at_lazy (vtable_type,
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vtable_address - vtable_address_point_offset (),
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VALUE_BFD_SECTION (value));
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/* Find the linker symbol for this vtable. */
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vtable_symbol
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= lookup_minimal_symbol_by_pc (VALUE_ADDRESS (vtable)
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+ VALUE_OFFSET (vtable)
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+ VALUE_EMBEDDED_OFFSET (vtable));
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if (! vtable_symbol)
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return NULL;
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/* The symbol's demangled name should be something like "vtable for
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CLASS", where CLASS is the name of the run-time type of VALUE.
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If we didn't like this approach, we could instead look in the
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type_info object itself to get the class name. But this way
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should work just as well, and doesn't read target memory. */
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vtable_symbol_name = SYMBOL_DEMANGLED_NAME (vtable_symbol);
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if (strncmp (vtable_symbol_name, "vtable for ", 11))
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error ("can't find linker symbol for virtual table for `%s' value",
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TYPE_NAME (value_type));
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class_name = vtable_symbol_name + 11;
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/* Try to look up the class name as a type name. */
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class_symbol = lookup_symbol (class_name, 0, STRUCT_NAMESPACE, 0, 0);
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if (! class_symbol)
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error ("can't find class named `%s', as given by C++ RTTI", class_name);
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/* Make sure the type symbol is sane. (An earlier version of this
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code would find constructor functions, who have the same name as
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the class.) */
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if (SYMBOL_CLASS (class_symbol) != LOC_TYPEDEF
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|| TYPE_CODE (SYMBOL_TYPE (class_symbol)) != TYPE_CODE_CLASS)
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error ("C++ RTTI gives a class name of `%s', but that isn't a type name",
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class_name);
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/* This is the object's run-time type! */
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run_time_type = SYMBOL_TYPE (class_symbol);
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/* Get the offset from VALUE to the top of the complete object.
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NOTE: this is the reverse of the meaning of *TOP_P. */
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offset_to_top
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= value_as_long (value_field (vtable, vtable_field_offset_to_top));
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if (full_p)
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*full_p = (- offset_to_top == VALUE_EMBEDDED_OFFSET (value)
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&& (TYPE_LENGTH (VALUE_ENCLOSING_TYPE (value))
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>= TYPE_LENGTH (run_time_type)));
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if (top_p)
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*top_p = - offset_to_top;
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if (using_enc_p)
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*using_enc_p = 0;
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return run_time_type;
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}
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static struct value *
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gnuv3_virtual_fn_field (struct value **value_p,
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struct fn_field *f, int j,
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struct type *type, int offset)
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{
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struct type *vtable_type = gdbarch_data (vtable_type_gdbarch_data);
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struct value *value = *value_p;
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struct type *value_type = check_typedef (VALUE_TYPE (value));
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struct type *vfn_base;
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CORE_ADDR vtable_address;
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struct value *vtable;
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struct value *vfn;
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/* Some simple sanity checks. */
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if (TYPE_CODE (value_type) != TYPE_CODE_CLASS)
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error ("Only classes can have virtual functions.");
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/* Find the base class that defines this virtual function. */
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vfn_base = TYPE_FN_FIELD_FCONTEXT (f, j);
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if (! vfn_base)
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/* In programs compiled with G++ version 1, the debug info doesn't
|
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say which base class defined the virtual function. We'll guess
|
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it's the same base class that has our vtable; this is wrong for
|
||||
multiple inheritance, but it's better than nothing. */
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vfn_base = TYPE_VPTR_BASETYPE (type);
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/* This type may have been defined before its virtual function table
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was. If so, fill in the virtual function table entry for the
|
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type now. */
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if (TYPE_VPTR_FIELDNO (vfn_base) < 0)
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fill_in_vptr_fieldno (vfn_base);
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|
||||
/* Now that we know which base class is defining our virtual
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function, cast our value to that baseclass. This takes care of
|
||||
any necessary `this' adjustments. */
|
||||
if (vfn_base != value_type)
|
||||
/* It would be nicer to simply cast the value to the appropriate
|
||||
base class (and I think that is supposed to be legal), but
|
||||
value_cast only does the right magic when casting pointers. */
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value = value_ind (value_cast (vfn_base, value_addr (value)));
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|
||||
/* Now value is an object of the appropriate base type. Fetch its
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virtual table. */
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vtable_address
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= value_as_pointer (value_field (value, TYPE_VPTR_FIELDNO (vfn_base)));
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vtable = value_at_lazy (vtable_type,
|
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vtable_address - vtable_address_point_offset (),
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||||
VALUE_BFD_SECTION (value));
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/* Fetch the appropriate function pointer from the vtable. */
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||||
vfn = value_subscript (value_field (vtable, vtable_field_virtual_functions),
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||||
value_from_longest (builtin_type_int,
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TYPE_FN_FIELD_VOFFSET (f, j)));
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||||
/* Cast the function pointer to the appropriate type. */
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||||
vfn = value_cast (lookup_pointer_type (TYPE_FN_FIELD_TYPE (f, j)),
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vfn);
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return vfn;
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}
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static void
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init_gnuv3_ops (void)
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{
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vtable_type_gdbarch_data = register_gdbarch_data (build_gdb_vtable_type, 0);
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gnu_v3_abi_ops.shortname = "gnu-v3";
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gnu_v3_abi_ops.longname = "GNU G++ Version 3 ABI";
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gnu_v3_abi_ops.doc = "G++ Version 3 ABI";
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gnu_v3_abi_ops.is_destructor_name = is_gnu_v3_mangled_dtor;
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gnu_v3_abi_ops.is_constructor_name = is_gnu_v3_mangled_ctor;
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gnu_v3_abi_ops.is_vtable_name = gnuv3_is_vtable_name;
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gnu_v3_abi_ops.is_operator_name = gnuv3_is_operator_name;
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gnu_v3_abi_ops.rtti_type = gnuv3_rtti_type;
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gnu_v3_abi_ops.virtual_fn_field = gnuv3_virtual_fn_field;
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}
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void
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_initialize_gnu_v3_abi (void)
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{
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init_gnuv3_ops ();
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||||
|
||||
register_cp_abi (gnu_v3_abi_ops);
|
||||
}
|
|
@ -47,6 +47,8 @@
|
|||
#include "symfile.h"
|
||||
#include "objfiles.h"
|
||||
#include "demangle.h"
|
||||
#include "value.h"
|
||||
#include "cp-abi.h"
|
||||
|
||||
/* Accumulate the minimal symbols for each objfile in bunches of BUNCH_SIZE.
|
||||
At the end, copy them all into one newly allocated location on an objfile's
|
||||
|
@ -956,9 +958,24 @@ install_minimal_symbols (struct objfile *objfile)
|
|||
objfile->minimal_symbol_count = mcount;
|
||||
objfile->msymbols = msymbols;
|
||||
|
||||
/* Try to guess the appropriate C++ ABI by looking at the names
|
||||
of the minimal symbols in the table. */
|
||||
{
|
||||
int i;
|
||||
|
||||
for (i = 0; i < mcount; i++)
|
||||
{
|
||||
const char *name = SYMBOL_NAME (&objfile->msymbols[i]);
|
||||
if (name[0] == '_' && name[1] == 'Z')
|
||||
{
|
||||
switch_to_cp_abi ("gnu-v3");
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/* Now walk through all the minimal symbols, selecting the newly added
|
||||
ones and attempting to cache their C++ demangled names. */
|
||||
|
||||
for (; mcount-- > 0; msymbols++)
|
||||
SYMBOL_INIT_DEMANGLED_NAME (msymbols, &objfile->symbol_obstack);
|
||||
|
||||
|
|
Loading…
Reference in a new issue