X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=gdb%2Fframe-unwind.c;h=079a411c205575f93f2a0e632d325a90d98f4399;hb=54a01e885b23df89e7e1e1585e896e0b7c53cf1d;hp=921d30b31d5dad23bb4e0af68de51be14756c122;hpb=b9362cc7a8079dd0809070cfd94e94097fa7b6d0;p=deliverable%2Fbinutils-gdb.git
diff --git a/gdb/frame-unwind.c b/gdb/frame-unwind.c
index 921d30b31d..079a411c20 100644
--- a/gdb/frame-unwind.c
+++ b/gdb/frame-unwind.c
@@ -1,12 +1,12 @@
/* Definitions for frame unwinder, for GDB, the GNU debugger.
- Copyright 2003 Free Software Foundation, Inc.
+ Copyright (C) 2003-2020 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
+ 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,
@@ -15,94 +15,298 @@
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. */
+ along with this program. If not, see . */
#include "defs.h"
#include "frame.h"
#include "frame-unwind.h"
-#include "gdb_assert.h"
#include "dummy-frame.h"
+#include "inline-frame.h"
+#include "value.h"
+#include "regcache.h"
+#include "gdb_obstack.h"
+#include "target.h"
+#include "gdbarch.h"
static struct gdbarch_data *frame_unwind_data;
-struct frame_unwind_table
+struct frame_unwind_table_entry
{
- frame_unwind_p_ftype **p;
- int middle;
- int nr;
+ const struct frame_unwind *unwinder;
+ struct frame_unwind_table_entry *next;
};
-/* Append a predicate to the end of the table. */
-static void
-append_predicate (struct frame_unwind_table *table, frame_unwind_p_ftype *p)
+struct frame_unwind_table
{
- table->p = xrealloc (table->p, ((table->nr + 1)
- * sizeof (frame_unwind_p_ftype *)));
- table->p[table->nr] = p;
- table->nr++;
-}
+ struct frame_unwind_table_entry *list;
+ /* The head of the OSABI part of the search list. */
+ struct frame_unwind_table_entry **osabi_head;
+};
static void *
-frame_unwind_init (struct gdbarch *gdbarch)
+frame_unwind_init (struct obstack *obstack)
{
- struct frame_unwind_table *table = XCALLOC (1, struct frame_unwind_table);
- append_predicate (table, dummy_frame_p);
+ struct frame_unwind_table *table
+ = OBSTACK_ZALLOC (obstack, struct frame_unwind_table);
+
+ /* Start the table out with a few default sniffers. OSABI code
+ can't override this. */
+ table->list = OBSTACK_ZALLOC (obstack, struct frame_unwind_table_entry);
+ table->list->unwinder = &dummy_frame_unwind;
+ table->list->next = OBSTACK_ZALLOC (obstack,
+ struct frame_unwind_table_entry);
+ table->list->next->unwinder = &inline_frame_unwind;
+ /* The insertion point for OSABI sniffers. */
+ table->osabi_head = &table->list->next->next;
return table;
}
-static void
-frame_unwind_free (struct gdbarch *gdbarch, void *data)
+void
+frame_unwind_prepend_unwinder (struct gdbarch *gdbarch,
+ const struct frame_unwind *unwinder)
{
- struct frame_unwind_table *table =
- gdbarch_data (gdbarch, frame_unwind_data);
- xfree (table->p);
- xfree (table);
+ struct frame_unwind_table *table
+ = (struct frame_unwind_table *) gdbarch_data (gdbarch, frame_unwind_data);
+ struct frame_unwind_table_entry *entry;
+
+ /* Insert the new entry at the start of the list. */
+ entry = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct frame_unwind_table_entry);
+ entry->unwinder = unwinder;
+ entry->next = (*table->osabi_head);
+ (*table->osabi_head) = entry;
}
void
-frame_unwind_append_predicate (struct gdbarch *gdbarch,
- frame_unwind_p_ftype *p)
+frame_unwind_append_unwinder (struct gdbarch *gdbarch,
+ const struct frame_unwind *unwinder)
+{
+ struct frame_unwind_table *table
+ = (struct frame_unwind_table *) gdbarch_data (gdbarch, frame_unwind_data);
+ struct frame_unwind_table_entry **ip;
+
+ /* Find the end of the list and insert the new entry there. */
+ for (ip = table->osabi_head; (*ip) != NULL; ip = &(*ip)->next);
+ (*ip) = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct frame_unwind_table_entry);
+ (*ip)->unwinder = unwinder;
+}
+
+/* Call SNIFFER from UNWINDER. If it succeeded set UNWINDER for
+ THIS_FRAME and return 1. Otherwise the function keeps THIS_FRAME
+ unchanged and returns 0. */
+
+static int
+frame_unwind_try_unwinder (struct frame_info *this_frame, void **this_cache,
+ const struct frame_unwind *unwinder)
{
- struct frame_unwind_table *table =
- gdbarch_data (gdbarch, frame_unwind_data);
- if (table == NULL)
+ int res = 0;
+
+ frame_prepare_for_sniffer (this_frame, unwinder);
+
+ try
{
- /* ULGH, called during architecture initialization. Patch
- things up. */
- table = frame_unwind_init (gdbarch);
- set_gdbarch_data (gdbarch, frame_unwind_data, table);
+ res = unwinder->sniffer (unwinder, this_frame, this_cache);
}
- append_predicate (table, p);
-}
-
-const struct frame_unwind *
-frame_unwind_find_by_pc (struct gdbarch *gdbarch, CORE_ADDR pc)
-{
- int i;
- struct frame_unwind_table *table =
- gdbarch_data (gdbarch, frame_unwind_data);
- if (!DEPRECATED_USE_GENERIC_DUMMY_FRAMES)
- /* Seriously old code. Don't even try to use this new mechanism.
- (Note: The variable USE_GENERIC_DUMMY_FRAMES is deprecated, not
- the dummy frame mechanism. All architectures should be using
- generic dummy frames). */
- return legacy_saved_regs_unwind;
- for (i = 0; i < table->nr; i++)
+ catch (const gdb_exception &ex)
+ {
+ /* Catch all exceptions, caused by either interrupt or error.
+ Reset *THIS_CACHE. */
+ *this_cache = NULL;
+ frame_cleanup_after_sniffer (this_frame);
+
+ if (ex.error == NOT_AVAILABLE_ERROR)
+ {
+ /* This usually means that not even the PC is available,
+ thus most unwinders aren't able to determine if they're
+ the best fit. Keep trying. Fallback prologue unwinders
+ should always accept the frame. */
+ return 0;
+ }
+ throw;
+ }
+
+ if (res)
+ return 1;
+ else
{
- const struct frame_unwind *desc = table->p[i] (pc);
- if (desc != NULL)
- return desc;
+ /* Don't set *THIS_CACHE to NULL here, because sniffer has to do
+ so. */
+ frame_cleanup_after_sniffer (this_frame);
+ return 0;
}
- return legacy_saved_regs_unwind;
+ gdb_assert_not_reached ("frame_unwind_try_unwinder");
+}
+
+/* Iterate through sniffers for THIS_FRAME frame until one returns with an
+ unwinder implementation. THIS_FRAME->UNWIND must be NULL, it will get set
+ by this function. Possibly initialize THIS_CACHE. */
+
+void
+frame_unwind_find_by_frame (struct frame_info *this_frame, void **this_cache)
+{
+ struct gdbarch *gdbarch = get_frame_arch (this_frame);
+ struct frame_unwind_table *table
+ = (struct frame_unwind_table *) gdbarch_data (gdbarch, frame_unwind_data);
+ struct frame_unwind_table_entry *entry;
+ const struct frame_unwind *unwinder_from_target;
+
+ unwinder_from_target = target_get_unwinder ();
+ if (unwinder_from_target != NULL
+ && frame_unwind_try_unwinder (this_frame, this_cache,
+ unwinder_from_target))
+ return;
+
+ unwinder_from_target = target_get_tailcall_unwinder ();
+ if (unwinder_from_target != NULL
+ && frame_unwind_try_unwinder (this_frame, this_cache,
+ unwinder_from_target))
+ return;
+
+ for (entry = table->list; entry != NULL; entry = entry->next)
+ if (frame_unwind_try_unwinder (this_frame, this_cache, entry->unwinder))
+ return;
+
+ internal_error (__FILE__, __LINE__, _("frame_unwind_find_by_frame failed"));
+}
+
+/* A default frame sniffer which always accepts the frame. Used by
+ fallback prologue unwinders. */
+
+int
+default_frame_sniffer (const struct frame_unwind *self,
+ struct frame_info *this_frame,
+ void **this_prologue_cache)
+{
+ return 1;
+}
+
+/* The default frame unwinder stop_reason callback. */
+
+enum unwind_stop_reason
+default_frame_unwind_stop_reason (struct frame_info *this_frame,
+ void **this_cache)
+{
+ struct frame_id this_id = get_frame_id (this_frame);
+
+ if (frame_id_eq (this_id, outer_frame_id))
+ return UNWIND_OUTERMOST;
+ else
+ return UNWIND_NO_REASON;
}
-extern initialize_file_ftype _initialize_frame_unwind; /* -Wmissing-prototypes */
+/* See frame-unwind.h. */
+
+CORE_ADDR
+default_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame)
+{
+ int pc_regnum = gdbarch_pc_regnum (gdbarch);
+ CORE_ADDR pc = frame_unwind_register_unsigned (next_frame, pc_regnum);
+ pc = gdbarch_addr_bits_remove (gdbarch, pc);
+ return pc;
+}
+
+/* See frame-unwind.h. */
+
+CORE_ADDR
+default_unwind_sp (struct gdbarch *gdbarch, struct frame_info *next_frame)
+{
+ int sp_regnum = gdbarch_sp_regnum (gdbarch);
+ return frame_unwind_register_unsigned (next_frame, sp_regnum);
+}
+
+/* Helper functions for value-based register unwinding. These return
+ a (possibly lazy) value of the appropriate type. */
+
+/* Return a value which indicates that FRAME did not save REGNUM. */
+
+struct value *
+frame_unwind_got_optimized (struct frame_info *frame, int regnum)
+{
+ struct gdbarch *gdbarch = frame_unwind_arch (frame);
+ struct type *type = register_type (gdbarch, regnum);
+ struct value *val;
+
+ /* Return an lval_register value, so that we print it as
+ "". */
+ val = allocate_value_lazy (type);
+ set_value_lazy (val, 0);
+ mark_value_bytes_optimized_out (val, 0, TYPE_LENGTH (type));
+ VALUE_LVAL (val) = lval_register;
+ VALUE_REGNUM (val) = regnum;
+ VALUE_NEXT_FRAME_ID (val)
+ = get_frame_id (get_next_frame_sentinel_okay (frame));
+ return val;
+}
+
+/* Return a value which indicates that FRAME copied REGNUM into
+ register NEW_REGNUM. */
+
+struct value *
+frame_unwind_got_register (struct frame_info *frame,
+ int regnum, int new_regnum)
+{
+ return value_of_register_lazy (frame, new_regnum);
+}
+
+/* Return a value which indicates that FRAME saved REGNUM in memory at
+ ADDR. */
+
+struct value *
+frame_unwind_got_memory (struct frame_info *frame, int regnum, CORE_ADDR addr)
+{
+ struct gdbarch *gdbarch = frame_unwind_arch (frame);
+ struct value *v = value_at_lazy (register_type (gdbarch, regnum), addr);
+
+ set_value_stack (v, 1);
+ return v;
+}
+
+/* Return a value which indicates that FRAME's saved version of
+ REGNUM has a known constant (computed) value of VAL. */
+
+struct value *
+frame_unwind_got_constant (struct frame_info *frame, int regnum,
+ ULONGEST val)
+{
+ struct gdbarch *gdbarch = frame_unwind_arch (frame);
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ struct value *reg_val;
+
+ reg_val = value_zero (register_type (gdbarch, regnum), not_lval);
+ store_unsigned_integer (value_contents_writeable (reg_val),
+ register_size (gdbarch, regnum), byte_order, val);
+ return reg_val;
+}
+
+struct value *
+frame_unwind_got_bytes (struct frame_info *frame, int regnum, gdb_byte *buf)
+{
+ struct gdbarch *gdbarch = frame_unwind_arch (frame);
+ struct value *reg_val;
+
+ reg_val = value_zero (register_type (gdbarch, regnum), not_lval);
+ memcpy (value_contents_raw (reg_val), buf, register_size (gdbarch, regnum));
+ return reg_val;
+}
+
+/* Return a value which indicates that FRAME's saved version of REGNUM
+ has a known constant (computed) value of ADDR. Convert the
+ CORE_ADDR to a target address if necessary. */
+
+struct value *
+frame_unwind_got_address (struct frame_info *frame, int regnum,
+ CORE_ADDR addr)
+{
+ struct gdbarch *gdbarch = frame_unwind_arch (frame);
+ struct value *reg_val;
+
+ reg_val = value_zero (register_type (gdbarch, regnum), not_lval);
+ pack_long (value_contents_writeable (reg_val),
+ register_type (gdbarch, regnum), addr);
+ return reg_val;
+}
void
_initialize_frame_unwind (void)
{
- frame_unwind_data = register_gdbarch_data (frame_unwind_init,
- frame_unwind_free);
+ frame_unwind_data = gdbarch_data_register_pre_init (frame_unwind_init);
}