/* Code dealing with dummy stack frames, for GDB, the GNU debugger.
- Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
- 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004 Free
- Software Foundation, Inc.
+ Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
+ 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2007, 2008
+ 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,
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 <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "command.h"
#include "gdbcmd.h"
#include "gdb_string.h"
-
-static int pc_in_dummy_frame (CORE_ADDR pc);
+#include "observer.h"
/* Dummy frame. This saves the processor state just prior to setting
up the inferior function call. Older targets save the registers
struct dummy_frame
{
struct dummy_frame *next;
-
- /* These values belong to the caller (the previous frame, the frame
- that this unwinds back to). */
- CORE_ADDR pc;
- CORE_ADDR top;
+ /* This frame's ID. Must match the value returned by
+ gdbarch_dummy_id. */
struct frame_id id;
+ /* The caller's regcache. */
struct regcache *regcache;
-
- /* Address range of the call dummy code. Look for PC in the range
- [LO..HI) (after allowing for DECR_PC_AFTER_BREAK). */
- CORE_ADDR call_lo;
- CORE_ADDR call_hi;
};
static struct dummy_frame *dummy_frame_stack = NULL;
-/* Function: pc_in_call_dummy (pc)
+/* Function: deprecated_pc_in_call_dummy (pc)
- Return true if the PC falls in a dummy frame created by gdb for an
- inferior call. The code below which allows DECR_PC_AFTER_BREAK is
- for infrun.c, which may give the function a PC without that
- subtracted out. */
-
-int
-deprecated_pc_in_call_dummy (CORE_ADDR pc)
-{
- return pc_in_dummy_frame (pc);
-}
-
-/* Return non-zero if the PC falls in a dummy frame.
-
- The code below which allows DECR_PC_AFTER_BREAK is for infrun.c,
- which may give the function a PC without that subtracted out.
+ Return non-zero if the PC falls in a dummy frame created by gdb for
+ an inferior call. The code below which allows gdbarch_decr_pc_after_break
+ is for infrun.c, which may give the function a PC without that
+ subtracted out.
FIXME: cagney/2002-11-23: This is silly. Surely "infrun.c" can
figure out what the real PC (as in the resume address) is BEFORE
- calling this function. */
+ calling this function.
+
+ NOTE: cagney/2004-08-02: I'm pretty sure that, with the introduction of
+ infrun.c:adjust_pc_after_break (thanks), this function is now
+ always called with a correctly adjusted PC!
-static int
-pc_in_dummy_frame (CORE_ADDR pc)
+ NOTE: cagney/2004-08-02: Code should not need to call this. */
+
+int
+deprecated_pc_in_call_dummy (CORE_ADDR pc)
{
struct dummy_frame *dummyframe;
for (dummyframe = dummy_frame_stack;
dummyframe != NULL;
dummyframe = dummyframe->next)
{
- if ((pc >= dummyframe->call_lo)
- && (pc < dummyframe->call_hi + DECR_PC_AFTER_BREAK))
+ if ((pc >= dummyframe->id.code_addr)
+ && (pc <= dummyframe->id.code_addr
+ + gdbarch_decr_pc_after_break (current_gdbarch)))
return 1;
}
return 0;
{
struct dummy_frame *dummy_frame;
- /* Check to see if there are stale dummy frames, perhaps left over
- from when a longjump took us out of a function that was called by
- the debugger. */
- dummy_frame = dummy_frame_stack;
- while (dummy_frame)
- /* FIXME: cagney/2004-08-02: Should just test IDs. */
- if (gdbarch_inner_than (current_gdbarch, dummy_frame->top,
- dummy_id->stack_addr))
- /* Stale -- destroy! */
- {
- dummy_frame_stack = dummy_frame->next;
- regcache_xfree (dummy_frame->regcache);
- xfree (dummy_frame);
- dummy_frame = dummy_frame_stack;
- }
- else
- dummy_frame = dummy_frame->next;
-
dummy_frame = XZALLOC (struct dummy_frame);
dummy_frame->regcache = caller_regcache;
dummy_frame->id = (*dummy_id);
- /* FIXME: cagney/2004-08-02: Retain for compatibility - trust the
- ID. */
- dummy_frame->pc = dummy_id->code_addr;
- dummy_frame->top = dummy_id->stack_addr;
- dummy_frame->call_lo = dummy_id->code_addr + 0;
- dummy_frame->call_hi = dummy_id->code_addr + 1;
dummy_frame->next = dummy_frame_stack;
dummy_frame_stack = dummy_frame;
}
+/* Pop the dummy frame with ID dummy_id from the dummy-frame stack. */
+
+void
+dummy_frame_pop (struct frame_id dummy_id)
+{
+ struct dummy_frame **dummy_ptr;
+
+ for (dummy_ptr = &dummy_frame_stack;
+ (*dummy_ptr) != NULL;
+ dummy_ptr = &(*dummy_ptr)->next)
+ {
+ struct dummy_frame *dummy = *dummy_ptr;
+ if (frame_id_eq (dummy->id, dummy_id))
+ {
+ *dummy_ptr = dummy->next;
+ regcache_xfree (dummy->regcache);
+ xfree (dummy);
+ break;
+ }
+ }
+}
+
+/* There may be stale dummy frames, perhaps left over from when a longjump took us
+ out of a function that was called by the debugger. Clean them up at least once
+ whenever we start a new inferior. */
+
+static void
+cleanup_dummy_frames (struct target_ops *target, int from_tty)
+{
+ struct dummy_frame *dummy, *next;
+
+ for (dummy = dummy_frame_stack; dummy; dummy = next)
+ {
+ next = dummy->next;
+ regcache_xfree (dummy->regcache);
+ xfree (dummy);
+ }
+
+ dummy_frame_stack = NULL;
+}
+
/* Return the dummy frame cache, it contains both the ID, and a
pointer to the regcache. */
struct dummy_frame_cache
int
dummy_frame_sniffer (const struct frame_unwind *self,
- struct frame_info *next_frame,
+ struct frame_info *this_frame,
void **this_prologue_cache)
{
struct dummy_frame *dummyframe;
entry point, or some random address on the stack. Trying to use
that PC to apply standard frame ID unwind techniques is just
asking for trouble. */
- /* Use an architecture specific method to extract the prev's dummy
- ID from the next frame. Note that this method uses
- frame_register_unwind to obtain the register values needed to
- determine the dummy frame's ID. */
- this_id = gdbarch_unwind_dummy_id (get_frame_arch (next_frame), next_frame);
-
- /* Use that ID to find the corresponding cache entry. */
- for (dummyframe = dummy_frame_stack;
- dummyframe != NULL;
- dummyframe = dummyframe->next)
+
+ /* Don't bother unles there is at least one dummy frame. */
+ if (dummy_frame_stack != NULL)
{
- /* Does the PC fall within the dummy frame's breakpoint
- instruction. If not, discard this one. */
- if (!(this_id.code_addr >= dummyframe->call_lo
- && this_id.code_addr < dummyframe->call_hi))
- continue;
- /* Does the FP match? "infcall.c" explicitly saved the
- top-of-stack before the inferior function call, assume
- unwind_dummy_id() returns that same stack value. */
- if (this_id.stack_addr != dummyframe->top)
- continue;
- /* The FP matches this dummy frame. */
- {
- struct dummy_frame_cache *cache;
- cache = FRAME_OBSTACK_ZALLOC (struct dummy_frame_cache);
- cache->prev_regcache = dummyframe->regcache;
- cache->this_id = this_id;
- (*this_prologue_cache) = cache;
- return 1;
- }
+ /* Use an architecture specific method to extract this frame's
+ dummy ID, assuming it is a dummy frame. */
+ this_id = gdbarch_dummy_id (get_frame_arch (this_frame), this_frame);
+
+ /* Use that ID to find the corresponding cache entry. */
+ for (dummyframe = dummy_frame_stack;
+ dummyframe != NULL;
+ dummyframe = dummyframe->next)
+ {
+ if (frame_id_eq (dummyframe->id, this_id))
+ {
+ struct dummy_frame_cache *cache;
+ cache = FRAME_OBSTACK_ZALLOC (struct dummy_frame_cache);
+ cache->prev_regcache = dummyframe->regcache;
+ cache->this_id = this_id;
+ (*this_prologue_cache) = cache;
+ return 1;
+ }
+ }
}
return 0;
}
/* Given a call-dummy dummy-frame, return the registers. Here the
register value is taken from the local copy of the register buffer. */
-static void
-dummy_frame_prev_register (struct frame_info *next_frame,
+static struct value *
+dummy_frame_prev_register (struct frame_info *this_frame,
void **this_prologue_cache,
- int regnum, int *optimized,
- enum lval_type *lvalp, CORE_ADDR *addrp,
- int *realnum, void *bufferp)
+ int regnum)
{
- /* The dummy-frame sniffer always fills in the cache. */
struct dummy_frame_cache *cache = (*this_prologue_cache);
+ struct gdbarch *gdbarch = get_frame_arch (this_frame);
+ struct value *reg_val;
+
+ /* The dummy-frame sniffer always fills in the cache. */
gdb_assert (cache != NULL);
/* Describe the register's location. Generic dummy frames always
have the register value in an ``expression''. */
- *optimized = 0;
- *lvalp = not_lval;
- *addrp = 0;
- *realnum = -1;
-
- /* If needed, find and return the value of the register. */
- if (bufferp != NULL)
- {
- /* Return the actual value. */
- /* Use the regcache_cooked_read() method so that it, on the fly,
- constructs either a raw or pseudo register from the raw
- register cache. */
- regcache_cooked_read (cache->prev_regcache, regnum, bufferp);
- }
+ reg_val = value_zero (register_type (gdbarch, regnum), not_lval);
+
+ /* Use the regcache_cooked_read() method so that it, on the fly,
+ constructs either a raw or pseudo register from the raw
+ register cache. */
+ regcache_cooked_read (cache->prev_regcache, regnum,
+ value_contents_writeable (reg_val));
+ return reg_val;
}
-/* Assuming that THIS frame is a dummy (remember, the NEXT and not
- THIS frame is passed in), return the ID of THIS frame. That ID is
+/* Assuming that THIS frame is a dummy, return the ID of THIS frame. That ID is
determined by examining the NEXT frame's unwound registers using
- the method unwind_dummy_id(). As a side effect, THIS dummy frame's
+ the method dummy_id(). As a side effect, THIS dummy frame's
dummy cache is located and and saved in THIS_PROLOGUE_CACHE. */
static void
-dummy_frame_this_id (struct frame_info *next_frame,
+dummy_frame_this_id (struct frame_info *this_frame,
void **this_prologue_cache,
struct frame_id *this_id)
{
{
gdb_print_host_address (s, file);
fprintf_unfiltered (file, ":");
- fprintf_unfiltered (file, " pc=0x%s", paddr (s->pc));
- fprintf_unfiltered (file, " top=0x%s", paddr (s->top));
fprintf_unfiltered (file, " id=");
fprint_frame_id (file, s->id);
- fprintf_unfiltered (file, " call_lo=0x%s", paddr (s->call_lo));
- fprintf_unfiltered (file, " call_hi=0x%s", paddr (s->call_hi));
fprintf_unfiltered (file, "\n");
}
}
{
struct ui_file *file = gdb_fopen (args, "w");
if (file == NULL)
- perror_with_name ("maintenance print dummy-frames");
+ perror_with_name (_("maintenance print dummy-frames"));
fprint_dummy_frames (file);
ui_file_delete (file);
}
_initialize_dummy_frame (void)
{
add_cmd ("dummy-frames", class_maintenance, maintenance_print_dummy_frames,
- "Print the contents of the internal dummy-frame stack.",
+ _("Print the contents of the internal dummy-frame stack."),
&maintenanceprintlist);
+ observer_attach_inferior_created (cleanup_dummy_frames);
}
projects / deliverable / binutils-gdb.git / blobdiff