/* Cache and manage frames for GDB, the GNU debugger.
- Copyright 1986, 1987, 1989, 1991, 1994, 1995, 1996, 1998, 2000,
- 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
+ Copyright (C) 1986, 1987, 1989, 1991, 1994, 1995, 1996, 1998, 2000, 2001,
+ 2002, 2003, 2004, 2007 Free Software Foundation, Inc.
This file is part of GDB.
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. */
+ Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301, USA. */
#include "defs.h"
#include "frame.h"
#include "frame-base.h"
#include "command.h"
#include "gdbcmd.h"
+#include "observer.h"
+#include "objfiles.h"
+#include "exceptions.h"
+
+static struct frame_info *get_prev_frame_1 (struct frame_info *this_frame);
/* We keep a cache of stack frames, each of which is a "struct
frame_info". The innermost one gets allocated (in
increases. This is a cached value. It could just as easily be
computed by counting back from the selected frame to the inner
most frame. */
- /* NOTE: cagney/2002-04-05: Perhaphs a level of ``-1'' should be
+ /* NOTE: cagney/2002-04-05: Perhaps a level of ``-1'' should be
reserved to indicate a bogus frame - one that has been created
just to keep GDB happy (GDB always needs a frame). For the
moment leave this as speculation. */
int level;
- /* The frame's type. */
- /* FIXME: cagney/2003-04-02: Should instead be returning
- ->unwind->type. Unfortunately, legacy code is still explicitly
- setting the type using the method deprecated_set_frame_type.
- Eliminate that method and this field can be eliminated. */
- enum frame_type type;
-
- /* For each register, address of where it was saved on entry to the
- frame, or zero if it was not saved on entry to this frame. This
- includes special registers such as pc and fp saved in special
- ways in the stack frame. The SP_REGNUM is even more special, the
- address here is the sp for the previous frame, not the address
- where the sp was saved. */
- /* Allocated by frame_saved_regs_zalloc () which is called /
- initialized by DEPRECATED_FRAME_INIT_SAVED_REGS(). */
- CORE_ADDR *saved_regs; /*NUM_REGS + NUM_PSEUDO_REGS*/
-
- /* Anything extra for this structure that may have been defined in
- the machine dependent files. */
- /* Allocated by frame_extra_info_zalloc () which is called /
- initialized by DEPRECATED_INIT_EXTRA_FRAME_INFO */
- struct frame_extra_info *extra_info;
-
/* The frame's low-level unwinder and corresponding cache. The
low-level unwinder is responsible for unwinding register values
for the previous frame. The low-level unwind methods are
- selected based on the presence, or otherwize, of register unwind
+ selected based on the presence, or otherwise, of register unwind
information such as CFI. */
void *prologue_cache;
const struct frame_unwind *unwind;
struct frame_info *next; /* down, inner, younger */
int prev_p;
struct frame_info *prev; /* up, outer, older */
+
+ /* The reason why we could not set PREV, or UNWIND_NO_REASON if we
+ could. Only valid when PREV_P is set. */
+ enum unwind_stop_reason stop_reason;
};
/* Flag to control debugging. */
static int frame_debug;
+static void
+show_frame_debug (struct ui_file *file, int from_tty,
+ struct cmd_list_element *c, const char *value)
+{
+ fprintf_filtered (file, _("Frame debugging is %s.\n"), value);
+}
/* Flag to indicate whether backtraces should stop at main et.al. */
static int backtrace_past_main;
-static unsigned int backtrace_limit = UINT_MAX;
+static void
+show_backtrace_past_main (struct ui_file *file, int from_tty,
+ struct cmd_list_element *c, const char *value)
+{
+ fprintf_filtered (file, _("\
+Whether backtraces should continue past \"main\" is %s.\n"),
+ value);
+}
+
+static int backtrace_past_entry;
+static void
+show_backtrace_past_entry (struct ui_file *file, int from_tty,
+ struct cmd_list_element *c, const char *value)
+{
+ fprintf_filtered (file, _("\
+Whether backtraces should continue past the entry point of a program is %s.\n"),
+ value);
+}
+static int backtrace_limit = INT_MAX;
+static void
+show_backtrace_limit (struct ui_file *file, int from_tty,
+ struct cmd_list_element *c, const char *value)
+{
+ fprintf_filtered (file, _("\
+An upper bound on the number of backtrace levels is %s.\n"),
+ value);
+}
+
+
+static void
+fprint_field (struct ui_file *file, const char *name, int p, CORE_ADDR addr)
+{
+ if (p)
+ fprintf_unfiltered (file, "%s=0x%s", name, paddr_nz (addr));
+ else
+ fprintf_unfiltered (file, "!%s", name);
+}
void
fprint_frame_id (struct ui_file *file, struct frame_id id)
{
- fprintf_unfiltered (file, "{stack=0x%s,code=0x%s,special=0x%s}",
- paddr_nz (id.stack_addr),
- paddr_nz (id.code_addr),
- paddr_nz (id.special_addr));
+ fprintf_unfiltered (file, "{");
+ fprint_field (file, "stack", id.stack_addr_p, id.stack_addr);
+ fprintf_unfiltered (file, ",");
+ fprint_field (file, "code", id.code_addr_p, id.code_addr);
+ fprintf_unfiltered (file, ",");
+ fprint_field (file, "special", id.special_addr_p, id.special_addr);
+ fprintf_unfiltered (file, "}");
}
static void
{
switch (type)
{
- case UNKNOWN_FRAME:
- fprintf_unfiltered (file, "UNKNOWN_FRAME");
- return;
case NORMAL_FRAME:
fprintf_unfiltered (file, "NORMAL_FRAME");
return;
fprintf_unfiltered (file, "level=%d", fi->level);
fprintf_unfiltered (file, ",");
fprintf_unfiltered (file, "type=");
- fprint_frame_type (file, fi->type);
+ if (fi->unwind != NULL)
+ fprint_frame_type (file, fi->unwind->type);
+ else
+ fprintf_unfiltered (file, "<unknown>");
fprintf_unfiltered (file, ",");
fprintf_unfiltered (file, "unwind=");
if (fi->unwind != NULL)
}
if (!fi->this_id.p)
{
- gdb_assert (!legacy_frame_p (current_gdbarch));
if (frame_debug)
fprintf_unfiltered (gdb_stdlog, "{ get_frame_id (fi=%d) ",
fi->level);
/* Find the unwinder. */
if (fi->unwind == NULL)
- {
- fi->unwind = frame_unwind_find_by_frame (fi->next,
- &fi->prologue_cache);
- /* FIXME: cagney/2003-04-02: Rather than storing the frame's
- type in the frame, the unwinder's type should be returned
- directly. Unfortunately, legacy code, called by
- legacy_get_prev_frame, explicitly set the frames type
- using the method deprecated_set_frame_type(). */
- fi->type = fi->unwind->type;
- }
+ fi->unwind = frame_unwind_find_by_frame (fi->next,
+ &fi->prologue_cache);
/* Find THIS frame's ID. */
fi->unwind->this_id (fi->next, &fi->prologue_cache, &fi->this_id.value);
fi->this_id.p = 1;
return fi->this_id.value;
}
+struct frame_id
+frame_unwind_id (struct frame_info *next_frame)
+{
+ /* Use prev_frame, and not get_prev_frame. The latter will truncate
+ the frame chain, leading to this function unintentionally
+ returning a null_frame_id (e.g., when a caller requests the frame
+ ID of "main()"s caller. */
+ return get_frame_id (get_prev_frame_1 (next_frame));
+}
+
const struct frame_id null_frame_id; /* All zeros. */
struct frame_id
frame_id_build_special (CORE_ADDR stack_addr, CORE_ADDR code_addr,
CORE_ADDR special_addr)
{
- struct frame_id id;
+ struct frame_id id = null_frame_id;
id.stack_addr = stack_addr;
+ id.stack_addr_p = 1;
id.code_addr = code_addr;
+ id.code_addr_p = 1;
id.special_addr = special_addr;
+ id.special_addr_p = 1;
return id;
}
struct frame_id
frame_id_build (CORE_ADDR stack_addr, CORE_ADDR code_addr)
{
- return frame_id_build_special (stack_addr, code_addr, 0);
+ struct frame_id id = null_frame_id;
+ id.stack_addr = stack_addr;
+ id.stack_addr_p = 1;
+ id.code_addr = code_addr;
+ id.code_addr_p = 1;
+ return id;
+}
+
+struct frame_id
+frame_id_build_wild (CORE_ADDR stack_addr)
+{
+ struct frame_id id = null_frame_id;
+ id.stack_addr = stack_addr;
+ id.stack_addr_p = 1;
+ return id;
}
int
frame_id_p (struct frame_id l)
{
int p;
- /* The .code can be NULL but the .stack cannot. */
- p = (l.stack_addr != 0);
+ /* The frame is valid iff it has a valid stack address. */
+ p = l.stack_addr_p;
if (frame_debug)
{
fprintf_unfiltered (gdb_stdlog, "{ frame_id_p (l=");
frame_id_eq (struct frame_id l, struct frame_id r)
{
int eq;
- if (l.stack_addr == 0 || r.stack_addr == 0)
- /* Like a NaN, if either ID is invalid, the result is false. */
+ if (!l.stack_addr_p || !r.stack_addr_p)
+ /* Like a NaN, if either ID is invalid, the result is false.
+ Note that a frame ID is invalid iff it is the null frame ID. */
eq = 0;
else if (l.stack_addr != r.stack_addr)
/* If .stack addresses are different, the frames are different. */
eq = 0;
- else if (l.code_addr == 0 || r.code_addr == 0)
- /* A zero code addr is a wild card, always succeed. */
+ else if (!l.code_addr_p || !r.code_addr_p)
+ /* An invalid code addr is a wild card, always succeed. */
eq = 1;
else if (l.code_addr != r.code_addr)
/* If .code addresses are different, the frames are different. */
eq = 0;
- else if (l.special_addr == 0 || r.special_addr == 0)
- /* A zero special addr is a wild card (or unused), always succeed. */
+ else if (!l.special_addr_p || !r.special_addr_p)
+ /* An invalid special addr is a wild card (or unused), always succeed. */
eq = 1;
else if (l.special_addr == r.special_addr)
/* Frames are equal. */
frame_id_inner (struct frame_id l, struct frame_id r)
{
int inner;
- if (l.stack_addr == 0 || r.stack_addr == 0)
+ if (!l.stack_addr_p || !r.stack_addr_p)
/* Like NaN, any operation involving an invalid ID always fails. */
inner = 0;
else
if (frame_id_inner (id, this))
/* Gone to far. */
return NULL;
- /* Either, we're not yet gone far enough out along the frame
- chain (inner(this,id), or we're comparing frameless functions
+ /* Either we're not yet gone far enough out along the frame
+ chain (inner(this,id)), or we're comparing frameless functions
(same .base, different .func, no test available). Struggle
on until we've definitly gone to far. */
}
if (!this_frame->prev_pc.p)
{
CORE_ADDR pc;
- if (gdbarch_unwind_pc_p (current_gdbarch))
+ if (this_frame->unwind == NULL)
+ this_frame->unwind
+ = frame_unwind_find_by_frame (this_frame->next,
+ &this_frame->prologue_cache);
+ if (this_frame->unwind->prev_pc != NULL)
+ /* A per-frame unwinder, prefer it. */
+ pc = this_frame->unwind->prev_pc (this_frame->next,
+ &this_frame->prologue_cache);
+ else if (gdbarch_unwind_pc_p (current_gdbarch))
{
/* The right way. The `pure' way. The one true way. This
method depends solely on the register-unwind code to
different ways that a PC could be unwound. */
pc = gdbarch_unwind_pc (current_gdbarch, this_frame);
}
- else if (this_frame->level < 0)
- {
- /* FIXME: cagney/2003-03-06: Old code and and a sentinel
- frame. Do like was always done. Fetch the PC's value
- direct from the global registers array (via read_pc).
- This assumes that this frame belongs to the current
- global register cache. The assumption is dangerous. */
- pc = read_pc ();
- }
- else if (DEPRECATED_FRAME_SAVED_PC_P ())
- {
- /* FIXME: cagney/2003-03-06: Old code, but not a sentinel
- frame. Do like was always done. Note that this method,
- unlike unwind_pc(), tries to handle all the different
- frame cases directly. It fails. */
- pc = DEPRECATED_FRAME_SAVED_PC (this_frame);
- }
else
- internal_error (__FILE__, __LINE__, "No gdbarch_unwind_pc method");
+ internal_error (__FILE__, __LINE__, _("No unwind_pc method"));
this_frame->prev_pc.value = pc;
this_frame->prev_pc.p = 1;
if (frame_debug)
}
CORE_ADDR
-frame_func_unwind (struct frame_info *fi)
+frame_func_unwind (struct frame_info *fi, enum frame_type this_type)
{
if (!fi->prev_func.p)
{
/* Make certain that this, and not the adjacent, function is
found. */
- CORE_ADDR addr_in_block = frame_unwind_address_in_block (fi);
+ CORE_ADDR addr_in_block = frame_unwind_address_in_block (fi, this_type);
fi->prev_func.p = 1;
fi->prev_func.addr = get_pc_function_start (addr_in_block);
if (frame_debug)
CORE_ADDR
get_frame_func (struct frame_info *fi)
{
- return frame_func_unwind (fi->next);
+ return frame_func_unwind (fi->next, get_frame_type (fi));
}
static int
-do_frame_unwind_register (void *src, int regnum, void *buf)
+do_frame_register_read (void *src, int regnum, gdb_byte *buf)
{
- frame_unwind_register (src, regnum, buf);
+ frame_register_read (src, regnum, buf);
return 1;
}
+struct regcache *
+frame_save_as_regcache (struct frame_info *this_frame)
+{
+ struct regcache *regcache = regcache_xmalloc (current_gdbarch);
+ struct cleanup *cleanups = make_cleanup_regcache_xfree (regcache);
+ regcache_save (regcache, do_frame_register_read, this_frame);
+ discard_cleanups (cleanups);
+ return regcache;
+}
+
void
frame_pop (struct frame_info *this_frame)
{
- struct regcache *scratch_regcache;
- struct cleanup *cleanups;
+ /* Make a copy of all the register values unwound from this frame.
+ Save them in a scratch buffer so that there isn't a race between
+ trying to extract the old values from the current_regcache while
+ at the same time writing new values into that same cache. */
+ struct regcache *scratch
+ = frame_save_as_regcache (get_prev_frame_1 (this_frame));
+ struct cleanup *cleanups = make_cleanup_regcache_xfree (scratch);
+
+ /* FIXME: cagney/2003-03-16: It should be possible to tell the
+ target's register cache that it is about to be hit with a burst
+ register transfer and that the sequence of register writes should
+ be batched. The pair target_prepare_to_store() and
+ target_store_registers() kind of suggest this functionality.
+ Unfortunately, they don't implement it. Their lack of a formal
+ definition can lead to targets writing back bogus values
+ (arguably a bug in the target code mind). */
+ /* Now copy those saved registers into the current regcache.
+ Here, regcache_cpy() calls regcache_restore(). */
+ regcache_cpy (current_regcache, scratch);
+ do_cleanups (cleanups);
- if (DEPRECATED_POP_FRAME_P ())
- {
- /* A legacy architecture that has implemented a custom pop
- function. All new architectures should instead be using the
- generic code below. */
- DEPRECATED_POP_FRAME;
- }
- else
- {
- /* Make a copy of all the register values unwound from this
- frame. Save them in a scratch buffer so that there isn't a
- race betweening trying to extract the old values from the
- current_regcache while, at the same time writing new values
- into that same cache. */
- struct regcache *scratch = regcache_xmalloc (current_gdbarch);
- struct cleanup *cleanups = make_cleanup_regcache_xfree (scratch);
- regcache_save (scratch, do_frame_unwind_register, this_frame);
- /* FIXME: cagney/2003-03-16: It should be possible to tell the
- target's register cache that it is about to be hit with a
- burst register transfer and that the sequence of register
- writes should be batched. The pair target_prepare_to_store()
- and target_store_registers() kind of suggest this
- functionality. Unfortunately, they don't implement it. Their
- lack of a formal definition can lead to targets writing back
- bogus values (arguably a bug in the target code mind). */
- /* Now copy those saved registers into the current regcache.
- Here, regcache_cpy() calls regcache_restore(). */
- regcache_cpy (current_regcache, scratch);
- do_cleanups (cleanups);
- }
/* We've made right mess of GDB's local state, just discard
everything. */
flush_cached_frames ();
void
frame_register_unwind (struct frame_info *frame, int regnum,
int *optimizedp, enum lval_type *lvalp,
- CORE_ADDR *addrp, int *realnump, void *bufferp)
+ CORE_ADDR *addrp, int *realnump, gdb_byte *bufferp)
{
struct frame_unwind_cache *cache;
/* NOTE: cagney/2002-11-27: A program trying to unwind a NULL frame
is broken. There is always a frame. If there, for some reason,
- isn't, there is some pretty busted code as it should have
+ isn't a frame, there is some pretty busted code as it should have
detected the problem before calling here. */
gdb_assert (frame != NULL);
/* Find the unwinder. */
if (frame->unwind == NULL)
- {
- frame->unwind = frame_unwind_find_by_frame (frame->next,
- &frame->prologue_cache);
- /* FIXME: cagney/2003-04-02: Rather than storing the frame's
- type in the frame, the unwinder's type should be returned
- directly. Unfortunately, legacy code, called by
- legacy_get_prev_frame, explicitly set the frames type using
- the method deprecated_set_frame_type(). */
- frame->type = frame->unwind->type;
- }
+ frame->unwind = frame_unwind_find_by_frame (frame->next,
+ &frame->prologue_cache);
/* Ask this frame to unwind its register. See comment in
- "frame-unwind.h" for why NEXT frame and this unwind cace are
+ "frame-unwind.h" for why NEXT frame and this unwind cache are
passed in. */
frame->unwind->prev_register (frame->next, &frame->prologue_cache, regnum,
optimizedp, lvalp, addrp, realnump, bufferp);
void
frame_register (struct frame_info *frame, int regnum,
int *optimizedp, enum lval_type *lvalp,
- CORE_ADDR *addrp, int *realnump, void *bufferp)
+ CORE_ADDR *addrp, int *realnump, gdb_byte *bufferp)
{
/* Require all but BUFFERP to be valid. A NULL BUFFERP indicates
that the value proper does not need to be fetched. */
gdb_assert (realnump != NULL);
/* gdb_assert (bufferp != NULL); */
- /* Ulgh! Old code that, for lval_register, sets ADDRP to the offset
- of the register in the register cache. It should instead return
- the REGNUM corresponding to that register. Translate the . */
- if (DEPRECATED_GET_SAVED_REGISTER_P ())
- {
- DEPRECATED_GET_SAVED_REGISTER (bufferp, optimizedp, addrp, frame,
- regnum, lvalp);
- /* Compute the REALNUM if the caller wants it. */
- if (*lvalp == lval_register)
- {
- int regnum;
- for (regnum = 0; regnum < NUM_REGS + NUM_PSEUDO_REGS; regnum++)
- {
- if (*addrp == register_offset_hack (current_gdbarch, regnum))
- {
- *realnump = regnum;
- return;
- }
- }
- internal_error (__FILE__, __LINE__,
- "Failed to compute the register number corresponding"
- " to 0x%s", paddr_d (*addrp));
- }
- *realnump = -1;
- return;
- }
-
/* Obtain the register value by unwinding the register from the next
(more inner frame). */
gdb_assert (frame != NULL && frame->next != NULL);
}
void
-frame_unwind_register (struct frame_info *frame, int regnum, void *buf)
+frame_unwind_register (struct frame_info *frame, int regnum, gdb_byte *buf)
{
int optimized;
CORE_ADDR addr;
void
get_frame_register (struct frame_info *frame,
- int regnum, void *buf)
+ int regnum, gdb_byte *buf)
{
frame_unwind_register (frame->next, regnum, buf);
}
LONGEST
frame_unwind_register_signed (struct frame_info *frame, int regnum)
{
- char buf[MAX_REGISTER_SIZE];
+ gdb_byte buf[MAX_REGISTER_SIZE];
frame_unwind_register (frame, regnum, buf);
- return extract_signed_integer (buf, DEPRECATED_REGISTER_VIRTUAL_SIZE (regnum));
+ return extract_signed_integer (buf, register_size (get_frame_arch (frame),
+ regnum));
}
LONGEST
ULONGEST
frame_unwind_register_unsigned (struct frame_info *frame, int regnum)
{
- char buf[MAX_REGISTER_SIZE];
+ gdb_byte buf[MAX_REGISTER_SIZE];
frame_unwind_register (frame, regnum, buf);
- return extract_unsigned_integer (buf, DEPRECATED_REGISTER_VIRTUAL_SIZE (regnum));
+ return extract_unsigned_integer (buf, register_size (get_frame_arch (frame),
+ regnum));
}
ULONGEST
frame_unwind_unsigned_register (struct frame_info *frame, int regnum,
ULONGEST *val)
{
- char buf[MAX_REGISTER_SIZE];
+ gdb_byte buf[MAX_REGISTER_SIZE];
frame_unwind_register (frame, regnum, buf);
- (*val) = extract_unsigned_integer (buf, DEPRECATED_REGISTER_VIRTUAL_SIZE (regnum));
+ (*val) = extract_unsigned_integer (buf,
+ register_size (get_frame_arch (frame),
+ regnum));
}
void
-put_frame_register (struct frame_info *frame, int regnum, const void *buf)
+put_frame_register (struct frame_info *frame, int regnum,
+ const gdb_byte *buf)
{
struct gdbarch *gdbarch = get_frame_arch (frame);
int realnum;
CORE_ADDR addr;
frame_register (frame, regnum, &optim, &lval, &addr, &realnum, NULL);
if (optim)
- error ("Attempt to assign to a value that was optimized out.");
+ error (_("Attempt to assign to a value that was optimized out."));
switch (lval)
{
case lval_memory:
{
/* FIXME: write_memory doesn't yet take constant buffers.
Arrrg! */
- char tmp[MAX_REGISTER_SIZE];
+ gdb_byte tmp[MAX_REGISTER_SIZE];
memcpy (tmp, buf, register_size (gdbarch, regnum));
write_memory (addr, tmp, register_size (gdbarch, regnum));
break;
regcache_cooked_write (current_regcache, realnum, buf);
break;
default:
- error ("Attempt to assign to an unmodifiable value.");
+ error (_("Attempt to assign to an unmodifiable value."));
}
}
/* frame_register_read ()
Find and return the value of REGNUM for the specified stack frame.
- The number of bytes copied is DEPRECATED_REGISTER_RAW_SIZE
- (REGNUM).
+ The number of bytes copied is REGISTER_SIZE (REGNUM).
Returns 0 if the register value could not be found. */
int
-frame_register_read (struct frame_info *frame, int regnum, void *myaddr)
+frame_register_read (struct frame_info *frame, int regnum,
+ gdb_byte *myaddr)
{
int optimized;
enum lval_type lval;
int realnum;
frame_register (frame, regnum, &optimized, &lval, &addr, &realnum, myaddr);
- /* FIXME: cagney/2002-05-15: This test, is just bogus.
+ /* FIXME: cagney/2002-05-15: This test is just bogus.
It indicates that the target failed to supply a value for a
register because it was "not available" at this time. Problem
return !optimized;
}
+int
+get_frame_register_bytes (struct frame_info *frame, int regnum,
+ CORE_ADDR offset, int len, gdb_byte *myaddr)
+{
+ struct gdbarch *gdbarch = get_frame_arch (frame);
+
+ /* Skip registers wholly inside of OFFSET. */
+ while (offset >= register_size (gdbarch, regnum))
+ {
+ offset -= register_size (gdbarch, regnum);
+ regnum++;
+ }
+
+ /* Copy the data. */
+ while (len > 0)
+ {
+ int curr_len = register_size (gdbarch, regnum) - offset;
+ if (curr_len > len)
+ curr_len = len;
+
+ if (curr_len == register_size (gdbarch, regnum))
+ {
+ if (!frame_register_read (frame, regnum, myaddr))
+ return 0;
+ }
+ else
+ {
+ gdb_byte buf[MAX_REGISTER_SIZE];
+ if (!frame_register_read (frame, regnum, buf))
+ return 0;
+ memcpy (myaddr, buf + offset, curr_len);
+ }
+
+ myaddr += curr_len;
+ len -= curr_len;
+ offset = 0;
+ regnum++;
+ }
+
+ return 1;
+}
+
+void
+put_frame_register_bytes (struct frame_info *frame, int regnum,
+ CORE_ADDR offset, int len, const gdb_byte *myaddr)
+{
+ struct gdbarch *gdbarch = get_frame_arch (frame);
+
+ /* Skip registers wholly inside of OFFSET. */
+ while (offset >= register_size (gdbarch, regnum))
+ {
+ offset -= register_size (gdbarch, regnum);
+ regnum++;
+ }
+
+ /* Copy the data. */
+ while (len > 0)
+ {
+ int curr_len = register_size (gdbarch, regnum) - offset;
+ if (curr_len > len)
+ curr_len = len;
+
+ if (curr_len == register_size (gdbarch, regnum))
+ {
+ put_frame_register (frame, regnum, myaddr);
+ }
+ else
+ {
+ gdb_byte buf[MAX_REGISTER_SIZE];
+ frame_register_read (frame, regnum, buf);
+ memcpy (buf + offset, myaddr, curr_len);
+ put_frame_register (frame, regnum, buf);
+ }
+
+ myaddr += curr_len;
+ len -= curr_len;
+ offset = 0;
+ regnum++;
+ }
+}
/* Map between a frame register number and its name. A frame register
space is a superset of the cooked register space --- it also
create_sentinel_frame (struct regcache *regcache)
{
struct frame_info *frame = FRAME_OBSTACK_ZALLOC (struct frame_info);
- frame->type = NORMAL_FRAME;
frame->level = -1;
/* Explicitly initialize the sentinel frame's cache. Provide it
with the underlying regcache. In the future additional
return data;
}
-CORE_ADDR *
-frame_saved_regs_zalloc (struct frame_info *fi)
-{
- fi->saved_regs = (CORE_ADDR *)
- frame_obstack_zalloc (SIZEOF_FRAME_SAVED_REGS);
- return fi->saved_regs;
-}
-
-CORE_ADDR *
-deprecated_get_frame_saved_regs (struct frame_info *fi)
-{
- return fi->saved_regs;
-}
-
/* Return the innermost (currently executing) stack frame. This is
split into two functions. The function unwind_to_current_frame()
is wrapped in catch exceptions so that, even when the unwind of the
unwind_to_current_frame (struct ui_out *ui_out, void *args)
{
struct frame_info *frame = get_prev_frame (args);
- /* A sentinel frame can fail to unwind, eg, because it's PC value
+ /* A sentinel frame can fail to unwind, e.g., because its PC value
lands in somewhere like start. */
if (frame == NULL)
return 1;
explicitly checks that ``print $pc'' with no registers prints "No
registers". */
if (!target_has_registers)
- error ("No registers.");
+ error (_("No registers."));
if (!target_has_stack)
- error ("No stack.");
+ error (_("No stack."));
if (!target_has_memory)
- error ("No memory.");
+ error (_("No memory."));
if (current_frame == NULL)
{
struct frame_info *sentinel_frame =
create_sentinel_frame (current_regcache);
if (catch_exceptions (uiout, unwind_to_current_frame, sentinel_frame,
- NULL, RETURN_MASK_ERROR) != 0)
+ RETURN_MASK_ERROR) != 0)
{
/* Oops! Fake a current frame? Is this useful? It has a PC
of zero, for instance. */
/* The "selected" stack frame is used by default for local and arg
access. May be zero, for no selected frame. */
-struct frame_info *deprecated_selected_frame;
+static struct frame_info *selected_frame;
-/* Return the selected frame. Always non-null (unless there isn't an
+/* Return the selected frame. Always non-NULL (unless there isn't an
inferior sufficient for creating a frame) in which case an error is
thrown. */
struct frame_info *
-get_selected_frame (void)
+get_selected_frame (const char *message)
{
- if (deprecated_selected_frame == NULL)
- /* Hey! Don't trust this. It should really be re-finding the
- last selected frame of the currently selected thread. This,
- though, is better than nothing. */
- select_frame (get_current_frame ());
+ if (selected_frame == NULL)
+ {
+ if (message != NULL && (!target_has_registers
+ || !target_has_stack
+ || !target_has_memory))
+ error (("%s"), message);
+ /* Hey! Don't trust this. It should really be re-finding the
+ last selected frame of the currently selected thread. This,
+ though, is better than nothing. */
+ select_frame (get_current_frame ());
+ }
/* There is always a frame. */
- gdb_assert (deprecated_selected_frame != NULL);
- return deprecated_selected_frame;
+ gdb_assert (selected_frame != NULL);
+ return selected_frame;
}
-/* This is a variant of get_selected_frame which can be called when
+/* This is a variant of get_selected_frame() which can be called when
the inferior does not have a frame; in that case it will return
- NULL instead of calling error (). */
+ NULL instead of calling error(). */
struct frame_info *
deprecated_safe_get_selected_frame (void)
{
if (!target_has_registers || !target_has_stack || !target_has_memory)
return NULL;
- return get_selected_frame ();
+ return get_selected_frame (NULL);
}
/* Select frame FI (or NULL - to invalidate the current frame). */
{
struct symtab *s;
- deprecated_selected_frame = fi;
- /* NOTE: cagney/2002-05-04: FI can be NULL. This occures when the
+ selected_frame = fi;
+ /* NOTE: cagney/2002-05-04: FI can be NULL. This occurs when the
frame is being invalidated. */
- if (selected_frame_level_changed_hook)
- selected_frame_level_changed_hook (frame_relative_level (fi));
+ if (deprecated_selected_frame_level_changed_hook)
+ deprecated_selected_frame_level_changed_hook (frame_relative_level (fi));
/* FIXME: kseitz/2002-08-28: It would be nice to call
- selected_frame_level_changed_event right here, but due to limitations
+ selected_frame_level_changed_event() right here, but due to limitations
in the current interfaces, we would end up flooding UIs with events
- because select_frame is used extensively internally.
+ because select_frame() is used extensively internally.
Once we have frame-parameterized frame (and frame-related) commands,
the event notification can be moved here, since this function will only
- be called when the users selected frame is being changed. */
+ be called when the user's selected frame is being changed. */
/* Ensure that symbols for this frame are read in. Also, determine the
source language of this frame, and switch to it if desired. */
if (fi)
{
/* We retrieve the frame's symtab by using the frame PC. However
- we cannot use the frame pc as is, because it usually points to
+ we cannot use the frame PC as-is, because it usually points to
the instruction following the "call", which is sometimes the
first instruction of another function. So we rely on
get_frame_address_in_block() which provides us with a PC which
}
}
}
-
-/* Return the register saved in the simplistic ``saved_regs'' cache.
- If the value isn't here AND a value is needed, try the next inner
- most frame. */
-
-static void
-legacy_saved_regs_prev_register (struct frame_info *next_frame,
- void **this_prologue_cache,
- int regnum, int *optimizedp,
- enum lval_type *lvalp, CORE_ADDR *addrp,
- int *realnump, void *bufferp)
-{
- /* HACK: New code is passed the next frame and this cache.
- Unfortunately, old code expects this frame. Since this is a
- backward compatibility hack, cheat by walking one level along the
- prologue chain to the frame the old code expects.
-
- Do not try this at home. Professional driver, closed course. */
- struct frame_info *frame = next_frame->prev;
- gdb_assert (frame != NULL);
-
- if (deprecated_get_frame_saved_regs (frame) == NULL)
- {
- /* If nothing's initialized the saved regs, do it now. */
- gdb_assert (DEPRECATED_FRAME_INIT_SAVED_REGS_P ());
- DEPRECATED_FRAME_INIT_SAVED_REGS (frame);
- gdb_assert (deprecated_get_frame_saved_regs (frame) != NULL);
- }
-
- if (deprecated_get_frame_saved_regs (frame) != NULL
- && deprecated_get_frame_saved_regs (frame)[regnum] != 0)
- {
- if (regnum == SP_REGNUM)
- {
- /* SP register treated specially. */
- *optimizedp = 0;
- *lvalp = not_lval;
- *addrp = 0;
- *realnump = -1;
- if (bufferp != NULL)
- /* NOTE: cagney/2003-05-09: In-lined store_address with
- it's body - store_unsigned_integer. */
- store_unsigned_integer (bufferp, DEPRECATED_REGISTER_RAW_SIZE (regnum),
- deprecated_get_frame_saved_regs (frame)[regnum]);
- }
- else
- {
- /* Any other register is saved in memory, fetch it but cache
- a local copy of its value. */
- *optimizedp = 0;
- *lvalp = lval_memory;
- *addrp = deprecated_get_frame_saved_regs (frame)[regnum];
- *realnump = -1;
- if (bufferp != NULL)
- {
-#if 1
- /* Save each register value, as it is read in, in a
- frame based cache. */
- void **regs = (*this_prologue_cache);
- if (regs == NULL)
- {
- int sizeof_cache = ((NUM_REGS + NUM_PSEUDO_REGS)
- * sizeof (void *));
- regs = frame_obstack_zalloc (sizeof_cache);
- (*this_prologue_cache) = regs;
- }
- if (regs[regnum] == NULL)
- {
- regs[regnum]
- = frame_obstack_zalloc (DEPRECATED_REGISTER_RAW_SIZE (regnum));
- read_memory (deprecated_get_frame_saved_regs (frame)[regnum], regs[regnum],
- DEPRECATED_REGISTER_RAW_SIZE (regnum));
- }
- memcpy (bufferp, regs[regnum], DEPRECATED_REGISTER_RAW_SIZE (regnum));
-#else
- /* Read the value in from memory. */
- read_memory (deprecated_get_frame_saved_regs (frame)[regnum], bufferp,
- DEPRECATED_REGISTER_RAW_SIZE (regnum));
-#endif
- }
- }
- return;
- }
-
- /* No luck. Assume this and the next frame have the same register
- value. Pass the unwind request down the frame chain to the next
- frame. Hopefully that frame will find the register's location. */
- frame_register_unwind (next_frame, regnum, optimizedp, lvalp, addrp,
- realnump, bufferp);
-}
-
-static void
-legacy_saved_regs_this_id (struct frame_info *next_frame,
- void **this_prologue_cache,
- struct frame_id *id)
-{
- /* A developer is trying to bring up a new architecture, help them
- by providing a default unwinder that refuses to unwind anything
- (the ID is always NULL). In the case of legacy code,
- legacy_get_prev_frame() will have previously set ->this_id.p, so
- this code won't be called. */
- (*id) = null_frame_id;
-}
-const struct frame_unwind legacy_saved_regs_unwinder = {
- /* Not really. It gets overridden by legacy_get_prev_frame. */
- UNKNOWN_FRAME,
- legacy_saved_regs_this_id,
- legacy_saved_regs_prev_register
-};
-const struct frame_unwind *legacy_saved_regs_unwind = &legacy_saved_regs_unwinder;
-
-
-/* Function: deprecated_generic_get_saved_register
- Find register number REGNUM relative to FRAME and put its (raw,
- target format) contents in *RAW_BUFFER.
-
- Set *OPTIMIZED if the variable was optimized out (and thus can't be
- fetched). Note that this is never set to anything other than zero
- in this implementation.
-
- Set *LVAL to lval_memory, lval_register, or not_lval, depending on
- whether the value was fetched from memory, from a register, or in a
- strange and non-modifiable way (e.g. a frame pointer which was
- calculated rather than fetched). We will use not_lval for values
- fetched from generic dummy frames.
-
- Set *ADDRP to the address, either in memory or as a
- DEPRECATED_REGISTER_BYTE offset into the registers array. If the
- value is stored in a dummy frame, set *ADDRP to zero.
-
- The argument RAW_BUFFER must point to aligned memory. */
-
-void
-deprecated_generic_get_saved_register (char *raw_buffer, int *optimized,
- CORE_ADDR *addrp,
- struct frame_info *frame, int regnum,
- enum lval_type *lval)
-{
- if (!target_has_registers)
- error ("No registers.");
-
- /* Normal systems don't optimize out things with register numbers. */
- if (optimized != NULL)
- *optimized = 0;
-
- if (addrp) /* default assumption: not found in memory */
- *addrp = 0;
-
- /* Note: since the current frame's registers could only have been
- saved by frames INTERIOR TO the current frame, we skip examining
- the current frame itself: otherwise, we would be getting the
- previous frame's registers which were saved by the current frame. */
-
- if (frame != NULL)
- {
- for (frame = get_next_frame (frame);
- frame_relative_level (frame) >= 0;
- frame = get_next_frame (frame))
- {
- if (get_frame_type (frame) == DUMMY_FRAME)
- {
- if (lval) /* found it in a CALL_DUMMY frame */
- *lval = not_lval;
- if (raw_buffer)
- /* FIXME: cagney/2002-06-26: This should be via the
- gdbarch_register_read() method so that it, on the
- fly, constructs either a raw or pseudo register
- from the raw register cache. */
- regcache_raw_read
- (deprecated_find_dummy_frame_regcache (get_frame_pc (frame),
- get_frame_base (frame)),
- regnum, raw_buffer);
- return;
- }
-
- DEPRECATED_FRAME_INIT_SAVED_REGS (frame);
- if (deprecated_get_frame_saved_regs (frame) != NULL
- && deprecated_get_frame_saved_regs (frame)[regnum] != 0)
- {
- if (lval) /* found it saved on the stack */
- *lval = lval_memory;
- if (regnum == SP_REGNUM)
- {
- if (raw_buffer) /* SP register treated specially */
- /* NOTE: cagney/2003-05-09: In-line store_address
- with it's body - store_unsigned_integer. */
- store_unsigned_integer (raw_buffer,
- DEPRECATED_REGISTER_RAW_SIZE (regnum),
- deprecated_get_frame_saved_regs (frame)[regnum]);
- }
- else
- {
- if (addrp) /* any other register */
- *addrp = deprecated_get_frame_saved_regs (frame)[regnum];
- if (raw_buffer)
- read_memory (deprecated_get_frame_saved_regs (frame)[regnum], raw_buffer,
- DEPRECATED_REGISTER_RAW_SIZE (regnum));
- }
- return;
- }
- }
- }
-
- /* If we get thru the loop to this point, it means the register was
- not saved in any frame. Return the actual live-register value. */
-
- if (lval) /* found it in a live register */
- *lval = lval_register;
- if (addrp)
- *addrp = DEPRECATED_REGISTER_BYTE (regnum);
- if (raw_buffer)
- deprecated_read_register_gen (regnum, raw_buffer);
-}
-
-/* Determine the frame's type based on its PC. */
-
-static enum frame_type
-frame_type_from_pc (CORE_ADDR pc)
-{
- if (DEPRECATED_USE_GENERIC_DUMMY_FRAMES
- && deprecated_pc_in_call_dummy (pc, 0, 0))
- return DUMMY_FRAME;
- else
- {
- char *name;
- find_pc_partial_function (pc, &name, NULL, NULL);
- if (PC_IN_SIGTRAMP (pc, name))
- return SIGTRAMP_FRAME;
- else
- return NORMAL_FRAME;
- }
-}
-
/* Create an arbitrary (i.e. address specified by user) or innermost frame.
Always returns a non-NULL value. */
paddr_nz (addr), paddr_nz (pc));
}
- fi = frame_obstack_zalloc (sizeof (struct frame_info));
+ fi = FRAME_OBSTACK_ZALLOC (struct frame_info);
fi->next = create_sentinel_frame (current_regcache);
/* Select/initialize both the unwind function and the frame's type
based on the PC. */
fi->unwind = frame_unwind_find_by_frame (fi->next, &fi->prologue_cache);
- if (fi->unwind->type != UNKNOWN_FRAME)
- fi->type = fi->unwind->type;
- else
- fi->type = frame_type_from_pc (pc);
fi->this_id.p = 1;
deprecated_update_frame_base_hack (fi, addr);
deprecated_update_frame_pc_hack (fi, pc);
- if (DEPRECATED_INIT_EXTRA_FRAME_INFO_P ())
- DEPRECATED_INIT_EXTRA_FRAME_INFO (0, fi);
-
if (frame_debug)
{
fprintf_unfiltered (gdb_stdlog, "-> ");
return NULL;
}
+/* Observer for the target_changed event. */
+
+void
+frame_observer_target_changed (struct target_ops *target)
+{
+ flush_cached_frames ();
+}
+
/* Flush the entire frame cache. */
void
}
}
-/* Create the previous frame using the deprecated methods
- INIT_EXTRA_INFO, INIT_FRAME_PC and INIT_FRAME_PC_FIRST. */
+/* Find where a register is saved (in memory or another register).
+ The result of frame_register_unwind is just where it is saved
+ relative to this particular frame. */
-static struct frame_info *
-legacy_get_prev_frame (struct frame_info *this_frame)
+static void
+frame_register_unwind_location (struct frame_info *this_frame, int regnum,
+ int *optimizedp, enum lval_type *lvalp,
+ CORE_ADDR *addrp, int *realnump)
{
- CORE_ADDR address = 0;
- struct frame_info *prev;
- int fromleaf;
+ gdb_assert (this_frame == NULL || this_frame->level >= 0);
- /* Don't frame_debug print legacy_get_prev_frame() here, just
- confuses the output. */
+ while (this_frame != NULL)
+ {
+ frame_register_unwind (this_frame, regnum, optimizedp, lvalp,
+ addrp, realnump, NULL);
- /* Allocate the new frame.
+ if (*optimizedp)
+ break;
- There is no reason to worry about memory leaks, should the
- remainder of the function fail. The allocated memory will be
- quickly reclaimed when the frame cache is flushed, and the `we've
- been here before' check, in get_prev_frame will stop repeated
- memory allocation calls. */
- prev = FRAME_OBSTACK_ZALLOC (struct frame_info);
- prev->level = this_frame->level + 1;
-
- /* Do not completely wire it in to the frame chain. Some (bad) code
- in INIT_FRAME_EXTRA_INFO tries to look along frame->prev to pull
- some fancy tricks (of course such code is, by definition,
- recursive).
-
- On the other hand, methods, such as get_frame_pc() and
- get_frame_base() rely on being able to walk along the frame
- chain. Make certain that at least they work by providing that
- link. Of course things manipulating prev can't go back. */
- prev->next = this_frame;
-
- /* NOTE: cagney/2002-11-18: Should have been correctly setting the
- frame's type here, before anything else, and not last, at the
- bottom of this function. The various
- DEPRECATED_INIT_EXTRA_FRAME_INFO, DEPRECATED_INIT_FRAME_PC,
- DEPRECATED_INIT_FRAME_PC_FIRST and
- DEPRECATED_FRAME_INIT_SAVED_REGS methods are full of work-arounds
- that handle the frame not being correctly set from the start.
- Unfortunately those same work-arounds rely on the type defaulting
- to NORMAL_FRAME. Ulgh! The new frame code does not have this
- problem. */
- prev->type = UNKNOWN_FRAME;
-
- /* A legacy frame's ID is always computed here. Mark it as valid. */
- prev->this_id.p = 1;
-
- /* Handle sentinel frame unwind as a special case. */
- if (this_frame->level < 0)
- {
- /* Try to unwind the PC. If that doesn't work, assume we've reached
- the oldest frame and simply return. Is there a better sentinal
- value? The unwound PC value is then used to initialize the new
- previous frame's type.
-
- Note that the pc-unwind is intentionally performed before the
- frame chain. This is ok since, for old targets, both
- frame_pc_unwind (nee, DEPRECATED_FRAME_SAVED_PC) and
- DEPRECATED_FRAME_CHAIN()) assume THIS_FRAME's data structures
- have already been initialized (using
- DEPRECATED_INIT_EXTRA_FRAME_INFO) and hence the call order
- doesn't matter.
-
- By unwinding the PC first, it becomes possible to, in the case of
- a dummy frame, avoid also unwinding the frame ID. This is
- because (well ignoring the PPC) a dummy frame can be located
- using THIS_FRAME's frame ID. */
-
- deprecated_update_frame_pc_hack (prev, frame_pc_unwind (this_frame));
- if (get_frame_pc (prev) == 0)
- {
- /* The allocated PREV_FRAME will be reclaimed when the frame
- obstack is next purged. */
- if (frame_debug)
- {
- fprintf_unfiltered (gdb_stdlog, "-> ");
- fprint_frame (gdb_stdlog, NULL);
- fprintf_unfiltered (gdb_stdlog,
- " // unwound legacy PC zero }\n");
- }
- return NULL;
- }
+ if (*lvalp != lval_register)
+ break;
- /* Set the unwind functions based on that identified PC. Ditto
- for the "type" but strongly prefer the unwinder's frame type. */
- prev->unwind = frame_unwind_find_by_frame (prev->next,
- &prev->prologue_cache);
- if (prev->unwind->type == UNKNOWN_FRAME)
- prev->type = frame_type_from_pc (get_frame_pc (prev));
- else
- prev->type = prev->unwind->type;
+ regnum = *realnump;
+ this_frame = get_next_frame (this_frame);
+ }
+}
- /* Find the prev's frame's ID. */
- if (prev->type == DUMMY_FRAME
- && gdbarch_unwind_dummy_id_p (current_gdbarch))
- {
- /* When unwinding a normal frame, the stack structure is
- determined by analyzing the frame's function's code (be
- it using brute force prologue analysis, or the dwarf2
- CFI). In the case of a dummy frame, that simply isn't
- possible. The The PC is either the program 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. */
- prev->this_id.value = gdbarch_unwind_dummy_id (current_gdbarch,
- this_frame);
- }
- else
- {
- /* We're unwinding a sentinel frame, the PC of which is
- pointing at a stack dummy. Fake up the dummy frame's ID
- using the same sequence as is found a traditional
- unwinder. Once all architectures supply the
- unwind_dummy_id method, this code can go away. */
- prev->this_id.value = frame_id_build (deprecated_read_fp (),
- read_pc ());
- }
+/* Return a "struct frame_info" corresponding to the frame that called
+ THIS_FRAME. Returns NULL if there is no such frame.
- /* Check that the unwound ID is valid. */
- if (!frame_id_p (prev->this_id.value))
- {
- if (frame_debug)
- {
- fprintf_unfiltered (gdb_stdlog, "-> ");
- fprint_frame (gdb_stdlog, NULL);
- fprintf_unfiltered (gdb_stdlog,
- " // unwound legacy ID invalid }\n");
- }
- return NULL;
- }
+ Unlike get_prev_frame, this function always tries to unwind the
+ frame. */
- /* Check that the new frame isn't inner to (younger, below,
- next) the old frame. If that happens the frame unwind is
- going backwards. */
- /* FIXME: cagney/2003-02-25: Ignore the sentinel frame since
- that doesn't have a valid frame ID. Should instead set the
- sentinel frame's frame ID to a `sentinel'. Leave it until
- after the switch to storing the frame ID, instead of the
- frame base, in the frame object. */
-
- /* Link it in. */
- this_frame->prev = prev;
-
- /* FIXME: cagney/2002-01-19: This call will go away. Instead of
- initializing extra info, all frames will use the frame_cache
- (passed to the unwind functions) to store additional frame
- info. Unfortunately legacy targets can't use
- legacy_get_prev_frame() to unwind the sentinel frame and,
- consequently, are forced to take this code path and rely on
- the below call to DEPRECATED_INIT_EXTRA_FRAME_INFO to
- initialize the inner-most frame. */
- if (DEPRECATED_INIT_EXTRA_FRAME_INFO_P ())
- {
- DEPRECATED_INIT_EXTRA_FRAME_INFO (0, prev);
- }
+static struct frame_info *
+get_prev_frame_1 (struct frame_info *this_frame)
+{
+ struct frame_info *prev_frame;
+ struct frame_id this_id;
+
+ gdb_assert (this_frame != NULL);
- if (prev->type == NORMAL_FRAME)
- prev->this_id.value.code_addr
- = get_pc_function_start (prev->this_id.value.code_addr);
+ if (frame_debug)
+ {
+ fprintf_unfiltered (gdb_stdlog, "{ get_prev_frame_1 (this_frame=");
+ if (this_frame != NULL)
+ fprintf_unfiltered (gdb_stdlog, "%d", this_frame->level);
+ else
+ fprintf_unfiltered (gdb_stdlog, "<NULL>");
+ fprintf_unfiltered (gdb_stdlog, ") ");
+ }
+ /* Only try to do the unwind once. */
+ if (this_frame->prev_p)
+ {
if (frame_debug)
{
fprintf_unfiltered (gdb_stdlog, "-> ");
- fprint_frame (gdb_stdlog, prev);
- fprintf_unfiltered (gdb_stdlog, " } // legacy innermost frame\n");
+ fprint_frame (gdb_stdlog, this_frame->prev);
+ fprintf_unfiltered (gdb_stdlog, " // cached \n");
}
- return prev;
+ return this_frame->prev;
}
+ this_frame->prev_p = 1;
+ this_frame->stop_reason = UNWIND_NO_REASON;
- /* This code only works on normal frames. A sentinel frame, where
- the level is -1, should never reach this code. */
- gdb_assert (this_frame->level >= 0);
-
- /* On some machines it is possible to call a function without
- setting up a stack frame for it. On these machines, we
- define this macro to take two args; a frameinfo pointer
- identifying a frame and a variable to set or clear if it is
- or isn't leafless. */
-
- /* Still don't want to worry about this except on the innermost
- frame. This macro will set FROMLEAF if THIS_FRAME is a frameless
- function invocation. */
- if (this_frame->level == 0)
- /* FIXME: 2002-11-09: Frameless functions can occure anywhere in
- the frame chain, not just the inner most frame! The generic,
- per-architecture, frame code should handle this and the below
- should simply be removed. */
- fromleaf = (DEPRECATED_FRAMELESS_FUNCTION_INVOCATION_P ()
- && DEPRECATED_FRAMELESS_FUNCTION_INVOCATION (this_frame));
- else
- fromleaf = 0;
-
- if (fromleaf)
- /* A frameless inner-most frame. The `FP' (which isn't an
- architecture frame-pointer register!) of the caller is the same
- as the callee. */
- /* FIXME: 2002-11-09: There isn't any reason to special case this
- edge condition. Instead the per-architecture code should hande
- it locally. */
- /* FIXME: cagney/2003-06-16: This returns the inner most stack
- address for the previous frame, that, however, is wrong. It
- should be the inner most stack address for the previous to
- previous frame. This is because it is the previous to previous
- frame's innermost stack address that is constant through out
- the lifetime of the previous frame (trust me :-). */
- address = get_frame_base (this_frame);
- else
+ /* Check that this frame's ID was valid. If it wasn't, don't try to
+ unwind to the prev frame. Be careful to not apply this test to
+ the sentinel frame. */
+ this_id = get_frame_id (this_frame);
+ if (this_frame->level >= 0 && !frame_id_p (this_id))
{
- /* Two macros defined in tm.h specify the machine-dependent
- actions to be performed here.
-
- First, get the frame's chain-pointer.
-
- If that is zero, the frame is the outermost frame or a leaf
- called by the outermost frame. This means that if start
- calls main without a frame, we'll return 0 (which is fine
- anyway).
-
- Nope; there's a problem. This also returns when the current
- routine is a leaf of main. This is unacceptable. We move
- this to after the ffi test; I'd rather have backtraces from
- start go curfluy than have an abort called from main not show
- main. */
- if (DEPRECATED_FRAME_CHAIN_P ())
- address = DEPRECATED_FRAME_CHAIN (this_frame);
- else
- {
- /* Someone is part way through coverting an old architecture
- to the new frame code. Implement FRAME_CHAIN the way the
- new frame will. */
- /* Find PREV frame's unwinder. */
- prev->unwind = frame_unwind_find_by_frame (this_frame,
- &prev->prologue_cache);
- /* FIXME: cagney/2003-04-02: Rather than storing the frame's
- type in the frame, the unwinder's type should be returned
- directly. Unfortunately, legacy code, called by
- legacy_get_prev_frame, explicitly set the frames type
- using the method deprecated_set_frame_type(). */
- prev->type = prev->unwind->type;
- /* Find PREV frame's ID. */
- prev->unwind->this_id (this_frame,
- &prev->prologue_cache,
- &prev->this_id.value);
- prev->this_id.p = 1;
- address = prev->this_id.value.stack_addr;
- }
-
- if (!legacy_frame_chain_valid (address, this_frame))
+ if (frame_debug)
{
- if (frame_debug)
- {
- fprintf_unfiltered (gdb_stdlog, "-> ");
- fprint_frame (gdb_stdlog, NULL);
- fprintf_unfiltered (gdb_stdlog,
- " // legacy frame chain invalid }\n");
- }
- return NULL;
+ fprintf_unfiltered (gdb_stdlog, "-> ");
+ fprint_frame (gdb_stdlog, NULL);
+ fprintf_unfiltered (gdb_stdlog, " // this ID is NULL }\n");
}
+ this_frame->stop_reason = UNWIND_NULL_ID;
+ return NULL;
}
- if (address == 0)
+
+ /* Check that this frame's ID isn't inner to (younger, below, next)
+ the next frame. This happens when a frame unwind goes backwards.
+ Exclude signal trampolines (due to sigaltstack the frame ID can
+ go backwards) and sentinel frames (the test is meaningless). */
+ if (this_frame->next->level >= 0
+ && this_frame->next->unwind->type != SIGTRAMP_FRAME
+ && frame_id_inner (this_id, get_frame_id (this_frame->next)))
{
if (frame_debug)
{
fprintf_unfiltered (gdb_stdlog, "-> ");
fprint_frame (gdb_stdlog, NULL);
- fprintf_unfiltered (gdb_stdlog,
- " // legacy frame chain NULL }\n");
+ fprintf_unfiltered (gdb_stdlog, " // this frame ID is inner }\n");
}
+ this_frame->stop_reason = UNWIND_INNER_ID;
return NULL;
}
- /* Link in the already allocated prev frame. */
- this_frame->prev = prev;
- deprecated_update_frame_base_hack (prev, address);
-
- /* This change should not be needed, FIXME! We should determine
- whether any targets *need* DEPRECATED_INIT_FRAME_PC to happen
- after DEPRECATED_INIT_EXTRA_FRAME_INFO and come up with a simple
- way to express what goes on here.
-
- DEPRECATED_INIT_EXTRA_FRAME_INFO is called from two places:
- create_new_frame (where the PC is already set up) and here (where
- it isn't). DEPRECATED_INIT_FRAME_PC is only called from here,
- always after DEPRECATED_INIT_EXTRA_FRAME_INFO.
-
- The catch is the MIPS, where DEPRECATED_INIT_EXTRA_FRAME_INFO
- requires the PC value (which hasn't been set yet). Some other
- machines appear to require DEPRECATED_INIT_EXTRA_FRAME_INFO
- before they can do DEPRECATED_INIT_FRAME_PC. Phoo.
-
- We shouldn't need DEPRECATED_INIT_FRAME_PC_FIRST to add more
- complication to an already overcomplicated part of GDB.
- gnu@cygnus.com, 15Sep92.
-
- Assuming that some machines need DEPRECATED_INIT_FRAME_PC after
- DEPRECATED_INIT_EXTRA_FRAME_INFO, one possible scheme:
-
- SETUP_INNERMOST_FRAME(): Default version is just create_new_frame
- (deprecated_read_fp ()), read_pc ()). Machines with extra frame
- info would do that (or the local equivalent) and then set the
- extra fields.
-
- SETUP_ARBITRARY_FRAME(argc, argv): Only change here is that
- create_new_frame would no longer init extra frame info;
- SETUP_ARBITRARY_FRAME would have to do that.
-
- INIT_PREV_FRAME(fromleaf, prev) Replace
- DEPRECATED_INIT_EXTRA_FRAME_INFO and DEPRECATED_INIT_FRAME_PC.
- This should also return a flag saying whether to keep the new
- frame, or whether to discard it, because on some machines (e.g.
- mips) it is really awkward to have DEPRECATED_FRAME_CHAIN_VALID
- called BEFORE DEPRECATED_INIT_EXTRA_FRAME_INFO (there is no good
- way to get information deduced in DEPRECATED_FRAME_CHAIN_VALID
- into the extra fields of the new frame). std_frame_pc(fromleaf,
- prev)
-
- This is the default setting for INIT_PREV_FRAME. It just does
- what the default DEPRECATED_INIT_FRAME_PC does. Some machines
- will call it from INIT_PREV_FRAME (either at the beginning, the
- end, or in the middle). Some machines won't use it.
-
- kingdon@cygnus.com, 13Apr93, 31Jan94, 14Dec94. */
-
- /* NOTE: cagney/2002-11-09: Just ignore the above! There is no
- reason for things to be this complicated.
-
- The trick is to assume that there is always a frame. Instead of
- special casing the inner-most frame, create fake frame
- (containing the hardware registers) that is inner to the
- user-visible inner-most frame (...) and then unwind from that.
- That way architecture code can use use the standard
- frame_XX_unwind() functions and not differentiate between the
- inner most and any other case.
-
- Since there is always a frame to unwind from, there is always
- somewhere (THIS_FRAME) to store all the info needed to construct
- a new (previous) frame without having to first create it. This
- means that the convolution below - needing to carefully order a
- frame's initialization - isn't needed.
-
- The irony here though, is that DEPRECATED_FRAME_CHAIN(), at least
- for a more up-to-date architecture, always calls
- FRAME_SAVED_PC(), and FRAME_SAVED_PC() computes the PC but
- without first needing the frame! Instead of the convolution
- below, we could have simply called FRAME_SAVED_PC() and been done
- with it! Note that FRAME_SAVED_PC() is being superseed by
- frame_pc_unwind() and that function does have somewhere to cache
- that PC value. */
-
- if (DEPRECATED_INIT_FRAME_PC_FIRST_P ())
- deprecated_update_frame_pc_hack (prev,
- DEPRECATED_INIT_FRAME_PC_FIRST (fromleaf,
- prev));
-
- if (DEPRECATED_INIT_EXTRA_FRAME_INFO_P ())
- DEPRECATED_INIT_EXTRA_FRAME_INFO (fromleaf, prev);
-
- /* This entry is in the frame queue now, which is good since
- FRAME_SAVED_PC may use that queue to figure out its value (see
- tm-sparc.h). We want the pc saved in the inferior frame. */
- if (DEPRECATED_INIT_FRAME_PC_P ())
- deprecated_update_frame_pc_hack (prev,
- DEPRECATED_INIT_FRAME_PC (fromleaf,
- prev));
-
- /* If ->frame and ->pc are unchanged, we are in the process of
- getting ourselves into an infinite backtrace. Some architectures
- check this in DEPRECATED_FRAME_CHAIN or thereabouts, but it seems
- like there is no reason this can't be an architecture-independent
- check. */
- if (get_frame_base (prev) == get_frame_base (this_frame)
- && get_frame_pc (prev) == get_frame_pc (this_frame))
+ /* Check that this and the next frame are not identical. If they
+ are, there is most likely a stack cycle. As with the inner-than
+ test above, avoid comparing the inner-most and sentinel frames. */
+ if (this_frame->level > 0
+ && frame_id_eq (this_id, get_frame_id (this_frame->next)))
{
- this_frame->prev = NULL;
- obstack_free (&frame_cache_obstack, prev);
if (frame_debug)
{
fprintf_unfiltered (gdb_stdlog, "-> ");
fprint_frame (gdb_stdlog, NULL);
- fprintf_unfiltered (gdb_stdlog,
- " // legacy this.id == prev.id }\n");
+ fprintf_unfiltered (gdb_stdlog, " // this frame has same ID }\n");
}
+ this_frame->stop_reason = UNWIND_SAME_ID;
return NULL;
}
- /* Initialize the code used to unwind the frame PREV based on the PC
- (and probably other architectural information). The PC lets you
- check things like the debug info at that point (dwarf2cfi?) and
- use that to decide how the frame should be unwound.
+ /* Check that this and the next frame do not unwind the PC register
+ to the same memory location. If they do, then even though they
+ have different frame IDs, the new frame will be bogus; two
+ functions can't share a register save slot for the PC. This can
+ happen when the prologue analyzer finds a stack adjustment, but
+ no PC save.
+
+ This check does assume that the "PC register" is roughly a
+ traditional PC, even if the gdbarch_unwind_pc method adjusts
+ it (we do not rely on the value, only on the unwound PC being
+ dependent on this value). A potential improvement would be
+ to have the frame prev_pc method and the gdbarch unwind_pc
+ method set the same lval and location information as
+ frame_register_unwind. */
+ if (this_frame->level > 0
+ && PC_REGNUM >= 0
+ && get_frame_type (this_frame) == NORMAL_FRAME
+ && get_frame_type (this_frame->next) == NORMAL_FRAME)
+ {
+ int optimized, realnum;
+ enum lval_type lval, nlval;
+ CORE_ADDR addr, naddr;
- If there isn't a FRAME_CHAIN, the code above will have already
- done this. */
- if (prev->unwind == NULL)
- prev->unwind = frame_unwind_find_by_frame (prev->next,
- &prev->prologue_cache);
+ frame_register_unwind_location (this_frame, PC_REGNUM, &optimized,
+ &lval, &addr, &realnum);
+ frame_register_unwind_location (get_next_frame (this_frame), PC_REGNUM,
+ &optimized, &nlval, &naddr, &realnum);
- /* If the unwinder provides a frame type, use it. Otherwize
- continue on to that heuristic mess. */
- if (prev->unwind->type != UNKNOWN_FRAME)
- {
- prev->type = prev->unwind->type;
- if (prev->type == NORMAL_FRAME)
- /* FIXME: cagney/2003-06-16: would get_frame_pc() be better? */
- prev->this_id.value.code_addr
- = get_pc_function_start (prev->this_id.value.code_addr);
- if (frame_debug)
+ if (lval == lval_memory && lval == nlval && addr == naddr)
{
- fprintf_unfiltered (gdb_stdlog, "-> ");
- fprint_frame (gdb_stdlog, prev);
- fprintf_unfiltered (gdb_stdlog, " } // legacy with unwound type\n");
+ if (frame_debug)
+ {
+ fprintf_unfiltered (gdb_stdlog, "-> ");
+ fprint_frame (gdb_stdlog, NULL);
+ fprintf_unfiltered (gdb_stdlog, " // no saved PC }\n");
+ }
+
+ this_frame->stop_reason = UNWIND_NO_SAVED_PC;
+ this_frame->prev = NULL;
+ return NULL;
}
- return prev;
}
- /* NOTE: cagney/2002-11-18: The code segments, found in
- create_new_frame and get_prev_frame(), that initializes the
- frames type is subtly different. The latter only updates ->type
- when it encounters a SIGTRAMP_FRAME or DUMMY_FRAME. This stops
- get_prev_frame() overriding the frame's type when the INIT code
- has previously set it. This is really somewhat bogus. The
- initialization, as seen in create_new_frame(), should occur
- before the INIT function has been called. */
- if (DEPRECATED_USE_GENERIC_DUMMY_FRAMES
- && deprecated_pc_in_call_dummy (get_frame_pc (prev), 0, 0))
- prev->type = DUMMY_FRAME;
- else
- {
- /* FIXME: cagney/2002-11-10: This should be moved to before the
- INIT code above so that the INIT code knows what the frame's
- type is (in fact, for a [generic] dummy-frame, the type can
- be set and then the entire initialization can be skipped.
- Unforunatly, its the INIT code that sets the PC (Hmm, catch
- 22). */
- char *name;
- find_pc_partial_function (get_frame_pc (prev), &name, NULL, NULL);
- if (PC_IN_SIGTRAMP (get_frame_pc (prev), name))
- prev->type = SIGTRAMP_FRAME;
- /* FIXME: cagney/2002-11-11: Leave prev->type alone. Some
- architectures are forcing the frame's type in INIT so we
- don't want to override it here. Remember, NORMAL_FRAME == 0,
- so it all works (just :-/). Once this initialization is
- moved to the start of this function, all this nastness will
- go away. */
- }
+ /* Allocate the new frame but do not wire it in to the frame chain.
+ Some (bad) code in INIT_FRAME_EXTRA_INFO tries to look along
+ frame->next to pull some fancy tricks (of course such code is, by
+ definition, recursive). Try to prevent it.
+
+ There is no reason to worry about memory leaks, should the
+ remainder of the function fail. The allocated memory will be
+ quickly reclaimed when the frame cache is flushed, and the `we've
+ been here before' check above will stop repeated memory
+ allocation calls. */
+ prev_frame = FRAME_OBSTACK_ZALLOC (struct frame_info);
+ prev_frame->level = this_frame->level + 1;
+
+ /* Don't yet compute ->unwind (and hence ->type). It is computed
+ on-demand in get_frame_type, frame_register_unwind, and
+ get_frame_id. */
+
+ /* Don't yet compute the frame's ID. It is computed on-demand by
+ get_frame_id(). */
+
+ /* The unwound frame ID is validate at the start of this function,
+ as part of the logic to decide if that frame should be further
+ unwound, and not here while the prev frame is being created.
+ Doing this makes it possible for the user to examine a frame that
+ has an invalid frame ID.
+
+ Some very old VAX code noted: [...] For the sake of argument,
+ suppose that the stack is somewhat trashed (which is one reason
+ that "info frame" exists). So, return 0 (indicating we don't
+ know the address of the arglist) if we don't know what frame this
+ frame calls. */
- if (prev->type == NORMAL_FRAME)
- prev->this_id.value.code_addr
- = get_pc_function_start (prev->this_id.value.code_addr);
+ /* Link it in. */
+ this_frame->prev = prev_frame;
+ prev_frame->next = this_frame;
if (frame_debug)
{
fprintf_unfiltered (gdb_stdlog, "-> ");
- fprint_frame (gdb_stdlog, prev);
- fprintf_unfiltered (gdb_stdlog, " } // legacy with confused type\n");
+ fprint_frame (gdb_stdlog, prev_frame);
+ fprintf_unfiltered (gdb_stdlog, " }\n");
}
- return prev;
+ return prev_frame;
}
-/* Return a structure containing various interesting information
- about the frame that called THIS_FRAME. Returns NULL
- if there is no such frame.
-
- This function tests some target-independent conditions that should
- terminate the frame chain, such as unwinding past main(). It
- should not contain any target-dependent tests, such as checking
- whether the program-counter is zero. */
+/* Debug routine to print a NULL frame being returned. */
-struct frame_info *
-get_prev_frame (struct frame_info *this_frame)
+static void
+frame_debug_got_null_frame (struct ui_file *file,
+ struct frame_info *this_frame,
+ const char *reason)
{
- struct frame_info *prev_frame;
-
if (frame_debug)
{
fprintf_unfiltered (gdb_stdlog, "{ get_prev_frame (this_frame=");
fprintf_unfiltered (gdb_stdlog, "%d", this_frame->level);
else
fprintf_unfiltered (gdb_stdlog, "<NULL>");
- fprintf_unfiltered (gdb_stdlog, ") ");
+ fprintf_unfiltered (gdb_stdlog, ") -> // %s}\n", reason);
}
+}
+
+/* Is this (non-sentinel) frame in the "main"() function? */
+
+static int
+inside_main_func (struct frame_info *this_frame)
+{
+ struct minimal_symbol *msymbol;
+ CORE_ADDR maddr;
+
+ if (symfile_objfile == 0)
+ return 0;
+ msymbol = lookup_minimal_symbol (main_name (), NULL, symfile_objfile);
+ if (msymbol == NULL)
+ return 0;
+ /* Make certain that the code, and not descriptor, address is
+ returned. */
+ maddr = gdbarch_convert_from_func_ptr_addr (current_gdbarch,
+ SYMBOL_VALUE_ADDRESS (msymbol),
+ ¤t_target);
+ return maddr == get_frame_func (this_frame);
+}
+
+/* Test whether THIS_FRAME is inside the process entry point function. */
+
+static int
+inside_entry_func (struct frame_info *this_frame)
+{
+ return (get_frame_func (this_frame) == entry_point_address ());
+}
+
+/* Return a structure containing various interesting information about
+ the frame that called THIS_FRAME. Returns NULL if there is entier
+ no such frame or the frame fails any of a set of target-independent
+ condition that should terminate the frame chain (e.g., as unwinding
+ past main()).
+
+ This function should not contain target-dependent tests, such as
+ checking whether the program-counter is zero. */
+
+struct frame_info *
+get_prev_frame (struct frame_info *this_frame)
+{
+ struct frame_info *prev_frame;
/* Return the inner-most frame, when the caller passes in NULL. */
/* NOTE: cagney/2002-11-09: Not sure how this would happen. The
while (1) { frame = get_prev_frame (frame); .... }. Ulgh! Why
it couldn't be written better, I don't know.
- NOTE: cagney/2003-01-11: I suspect what is happening is
+ NOTE: cagney/2003-01-11: I suspect what is happening in
block_innermost_frame() is, when the target has no state
- (registers, memory, ...), still calling this function. The
+ (registers, memory, ...), it is still calling this function. The
assumption being that this function will return NULL indicating
that a frame isn't possible, rather than checking that the target
has state and then calling get_current_frame() and
Per the above, this code shouldn't even be called with a NULL
THIS_FRAME. */
+ frame_debug_got_null_frame (gdb_stdlog, this_frame, "this_frame NULL");
return current_frame;
}
get_current_frame(). */
gdb_assert (this_frame != NULL);
- /* Make sure we pass an address within THIS_FRAME's code block to
- inside_main_func. Otherwise, we might stop unwinding at a
- function which has a call instruction as its last instruction if
- that function immediately precedes main(). */
+ /* tausq/2004-12-07: Dummy frames are skipped because it doesn't make much
+ sense to stop unwinding at a dummy frame. One place where a dummy
+ frame may have an address "inside_main_func" is on HPUX. On HPUX, the
+ pcsqh register (space register for the instruction at the head of the
+ instruction queue) cannot be written directly; the only way to set it
+ is to branch to code that is in the target space. In order to implement
+ frame dummies on HPUX, the called function is made to jump back to where
+ the inferior was when the user function was called. If gdb was inside
+ the main function when we created the dummy frame, the dummy frame will
+ point inside the main function. */
if (this_frame->level >= 0
+ && get_frame_type (this_frame) != DUMMY_FRAME
&& !backtrace_past_main
- && inside_main_func (get_frame_address_in_block (this_frame)))
- /* Don't unwind past main(), bug always unwind the sentinel frame.
- Note, this is done _before_ the frame has been marked as
- previously unwound. That way if the user later decides to
- allow unwinds past main(), that just happens. */
+ && inside_main_func (this_frame))
+ /* Don't unwind past main(). Note, this is done _before_ the
+ frame has been marked as previously unwound. That way if the
+ user later decides to enable unwinds past main(), that will
+ automatically happen. */
{
- if (frame_debug)
- fprintf_unfiltered (gdb_stdlog, "-> NULL // inside main func }\n");
+ frame_debug_got_null_frame (gdb_stdlog, this_frame, "inside main func");
return NULL;
}
- if (this_frame->level > backtrace_limit)
+ /* If the user's backtrace limit has been exceeded, stop. We must
+ add two to the current level; one of those accounts for backtrace_limit
+ being 1-based and the level being 0-based, and the other accounts for
+ the level of the new frame instead of the level of the current
+ frame. */
+ if (this_frame->level + 2 > backtrace_limit)
{
- error ("Backtrace limit of %d exceeded", backtrace_limit);
+ frame_debug_got_null_frame (gdb_stdlog, this_frame,
+ "backtrace limit exceeded");
+ return NULL;
}
/* If we're already inside the entry function for the main objfile,
then it isn't valid. Don't apply this test to a dummy frame -
- dummy frame PC's typically land in the entry func. Don't apply
+ dummy frame PCs typically land in the entry func. Don't apply
this test to the sentinel frame. Sentinel frames should always
be allowed to unwind. */
- /* NOTE: cagney/2003-02-25: Don't enable until someone has found
- hard evidence that this is needed. */
- /* NOTE: cagney/2003-07-07: Fixed a bug in inside_main_func - wasn't
- checking for "main" in the minimal symbols. With that fixed
- asm-source tests now stop in "main" instead of halting the
- backtrace in wierd and wonderful ways somewhere inside the entry
- file. Suspect that deprecated_inside_entry_file and
- inside_entry_func tests were added to work around that (now
- fixed) case. */
+ /* NOTE: cagney/2003-07-07: Fixed a bug in inside_main_func() -
+ wasn't checking for "main" in the minimal symbols. With that
+ fixed asm-source tests now stop in "main" instead of halting the
+ backtrace in weird and wonderful ways somewhere inside the entry
+ file. Suspect that tests for inside the entry file/func were
+ added to work around that (now fixed) case. */
/* NOTE: cagney/2003-07-15: danielj (if I'm reading it right)
suggested having the inside_entry_func test use the
- inside_main_func msymbol trick (along with entry_point_address I
- guess) to determine the address range of the start function.
+ inside_main_func() msymbol trick (along with entry_point_address()
+ I guess) to determine the address range of the start function.
That should provide a far better stopper than the current
heuristics. */
- /* NOTE: cagney/2003-07-15: Need to add a "set backtrace
- beyond-entry-func" command so that this can be selectively
- disabled. */
- if (0
-#if 0
- && backtrace_beyond_entry_func
-#endif
- && this_frame->type != DUMMY_FRAME && this_frame->level >= 0
+ /* NOTE: tausq/2004-10-09: this is needed if, for example, the compiler
+ applied tail-call optimizations to main so that a function called
+ from main returns directly to the caller of main. Since we don't
+ stop at main, we should at least stop at the entry point of the
+ application. */
+ if (!backtrace_past_entry
+ && get_frame_type (this_frame) != DUMMY_FRAME && this_frame->level >= 0
&& inside_entry_func (this_frame))
{
- if (frame_debug)
- {
- fprintf_unfiltered (gdb_stdlog, "-> ");
- fprint_frame (gdb_stdlog, NULL);
- fprintf_unfiltered (gdb_stdlog, "// inside entry func }\n");
- }
+ frame_debug_got_null_frame (gdb_stdlog, this_frame, "inside entry func");
return NULL;
}
- /* Only try to do the unwind once. */
- if (this_frame->prev_p)
- {
- if (frame_debug)
- {
- fprintf_unfiltered (gdb_stdlog, "-> ");
- fprint_frame (gdb_stdlog, this_frame->prev);
- fprintf_unfiltered (gdb_stdlog, " // cached \n");
- }
- return this_frame->prev;
- }
- this_frame->prev_p = 1;
-
- /* If we're inside the entry file, it isn't valid. Don't apply this
- test to a dummy frame - dummy frame PC's typically land in the
- entry file. Don't apply this test to the sentinel frame.
- Sentinel frames should always be allowed to unwind. */
- /* NOTE: drow/2002-12-25: should there be a way to disable this
- check? It assumes a single small entry file, and the way some
- debug readers (e.g. dbxread) figure out which object is the
- entry file is somewhat hokey. */
- /* NOTE: cagney/2003-01-10: If there is a way of disabling this test
- then it should probably be moved to before the ->prev_p test,
- above. */
- /* NOTE: vinschen/2003-04-01: Disabled. It turns out that the call
- to deprecated_inside_entry_file destroys a meaningful backtrace
- under some conditions. E. g. the backtrace tests in the
- asm-source testcase are broken for some targets. In this test
- the functions are all implemented as part of one file and the
- testcase is not necessarily linked with a start file (depending
- on the target). What happens is, that the first frame is printed
- normaly and following frames are treated as being inside the
- enttry file then. This way, only the #0 frame is printed in the
- backtrace output. */
- if (0
- && this_frame->type != DUMMY_FRAME && this_frame->level >= 0
- && deprecated_inside_entry_file (get_frame_pc (this_frame)))
- {
- if (frame_debug)
- {
- fprintf_unfiltered (gdb_stdlog, "-> ");
- fprint_frame (gdb_stdlog, NULL);
- fprintf_unfiltered (gdb_stdlog, " // inside entry file }\n");
- }
- return NULL;
- }
-
- /* If any of the old frame initialization methods are around, use
- the legacy get_prev_frame method. */
- if (legacy_frame_p (current_gdbarch))
- {
- prev_frame = legacy_get_prev_frame (this_frame);
- return prev_frame;
- }
-
- /* Check that this frame's ID was valid. If it wasn't, don't try to
- unwind to the prev frame. Be careful to not apply this test to
- the sentinel frame. */
- if (this_frame->level >= 0 && !frame_id_p (get_frame_id (this_frame)))
- {
- if (frame_debug)
- {
- fprintf_unfiltered (gdb_stdlog, "-> ");
- fprint_frame (gdb_stdlog, NULL);
- fprintf_unfiltered (gdb_stdlog, " // this ID is NULL }\n");
- }
- return NULL;
- }
-
- /* Check that this frame's ID isn't inner to (younger, below, next)
- the next frame. This happens when a frame unwind goes backwards.
- Since the sentinel frame doesn't really exist, don't compare the
- inner-most against that sentinel. */
+ /* Assume that the only way to get a zero PC is through something
+ like a SIGSEGV or a dummy frame, and hence that NORMAL frames
+ will never unwind a zero PC. */
if (this_frame->level > 0
- && frame_id_inner (get_frame_id (this_frame),
- get_frame_id (this_frame->next)))
- error ("Previous frame inner to this frame (corrupt stack?)");
-
- /* Check that this and the next frame are not identical. If they
- are, there is most likely a stack cycle. As with the inner-than
- test above, avoid comparing the inner-most and sentinel frames. */
- if (this_frame->level > 0
- && frame_id_eq (get_frame_id (this_frame),
- get_frame_id (this_frame->next)))
- error ("Previous frame identical to this frame (corrupt stack?)");
-
- /* Allocate the new frame but do not wire it in to the frame chain.
- Some (bad) code in INIT_FRAME_EXTRA_INFO tries to look along
- frame->next to pull some fancy tricks (of course such code is, by
- definition, recursive). Try to prevent it.
-
- There is no reason to worry about memory leaks, should the
- remainder of the function fail. The allocated memory will be
- quickly reclaimed when the frame cache is flushed, and the `we've
- been here before' check above will stop repeated memory
- allocation calls. */
- prev_frame = FRAME_OBSTACK_ZALLOC (struct frame_info);
- prev_frame->level = this_frame->level + 1;
-
- /* Don't yet compute ->unwind (and hence ->type). It is computed
- on-demand in get_frame_type, frame_register_unwind, and
- get_frame_id. */
-
- /* Don't yet compute the frame's ID. It is computed on-demand by
- get_frame_id(). */
-
- /* The unwound frame ID is validate at the start of this function,
- as part of the logic to decide if that frame should be further
- unwound, and not here while the prev frame is being created.
- Doing this makes it possible for the user to examine a frame that
- has an invalid frame ID.
-
- Some very old VAX code noted: [...] For the sake of argument,
- suppose that the stack is somewhat trashed (which is one reason
- that "info frame" exists). So, return 0 (indicating we don't
- know the address of the arglist) if we don't know what frame this
- frame calls. */
-
- /* Link it in. */
- this_frame->prev = prev_frame;
- prev_frame->next = this_frame;
-
- if (frame_debug)
+ && get_frame_type (this_frame) == NORMAL_FRAME
+ && get_frame_type (get_next_frame (this_frame)) == NORMAL_FRAME
+ && get_frame_pc (this_frame) == 0)
{
- fprintf_unfiltered (gdb_stdlog, "-> ");
- fprint_frame (gdb_stdlog, prev_frame);
- fprintf_unfiltered (gdb_stdlog, " }\n");
+ frame_debug_got_null_frame (gdb_stdlog, this_frame, "zero PC");
+ return NULL;
}
- return prev_frame;
+ return get_prev_frame_1 (this_frame);
}
CORE_ADDR
return frame_pc_unwind (frame->next);
}
-/* Return an address of that falls within the frame's code block. */
+/* Return an address that falls within NEXT_FRAME's caller's code
+ block, assuming that the caller is a THIS_TYPE frame. */
CORE_ADDR
-frame_unwind_address_in_block (struct frame_info *next_frame)
+frame_unwind_address_in_block (struct frame_info *next_frame,
+ enum frame_type this_type)
{
/* A draft address. */
CORE_ADDR pc = frame_pc_unwind (next_frame);
+ /* If NEXT_FRAME was called by a signal frame or dummy frame, then
+ we shold not adjust the unwound PC. These frames may not call
+ their next frame in the normal way; the operating system or GDB
+ may have pushed their resume address manually onto the stack, so
+ it may be the very first instruction. Even if the resume address
+ was not manually pushed, they expect to be returned to. */
+ if (this_type != NORMAL_FRAME)
+ return pc;
+
/* If THIS frame is not inner most (i.e., NEXT isn't the sentinel),
and NEXT is `normal' (i.e., not a sigtramp, dummy, ....) THIS
frame's PC ends up pointing at the instruction fallowing the
"call". Adjust that PC value so that it falls on the call
instruction (which, hopefully, falls within THIS frame's code
- block. So far it's proved to be a very good approximation. See
- get_frame_type for why ->type can't be used. */
+ block). So far it's proved to be a very good approximation. See
+ get_frame_type() for why ->type can't be used. */
if (next_frame->level >= 0
&& get_frame_type (next_frame) == NORMAL_FRAME)
--pc;
CORE_ADDR
get_frame_address_in_block (struct frame_info *this_frame)
{
- return frame_unwind_address_in_block (this_frame->next);
+ return frame_unwind_address_in_block (this_frame->next,
+ get_frame_type (this_frame));
}
static int
enum frame_type
get_frame_type (struct frame_info *frame)
{
- /* Some targets still don't use [generic] dummy frames. Catch them
- here. */
- if (!DEPRECATED_USE_GENERIC_DUMMY_FRAMES
- && deprecated_frame_in_dummy (frame))
- return DUMMY_FRAME;
-
- /* Some legacy code, e.g, mips_init_extra_frame_info() wants
- to determine the frame's type prior to it being completely
- initialized. Don't attempt to lazily initialize ->unwind for
- legacy code. It will be initialized in legacy_get_prev_frame(). */
- if (frame->unwind == NULL && !legacy_frame_p (current_gdbarch))
- {
- /* Initialize the frame's unwinder because it is that which
- provides the frame's type. */
- frame->unwind = frame_unwind_find_by_frame (frame->next,
- &frame->prologue_cache);
- /* FIXME: cagney/2003-04-02: Rather than storing the frame's
- type in the frame, the unwinder's type should be returned
- directly. Unfortunately, legacy code, called by
- legacy_get_prev_frame, explicitly set the frames type using
- the method deprecated_set_frame_type(). */
- frame->type = frame->unwind->type;
- }
- if (frame->type == UNKNOWN_FRAME)
- return NORMAL_FRAME;
- else
- return frame->type;
-}
-
-void
-deprecated_set_frame_type (struct frame_info *frame, enum frame_type type)
-{
- /* Arrrg! See comment in "frame.h". */
- frame->type = type;
-}
-
-struct frame_extra_info *
-get_frame_extra_info (struct frame_info *fi)
-{
- return fi->extra_info;
-}
-
-struct frame_extra_info *
-frame_extra_info_zalloc (struct frame_info *fi, long size)
-{
- fi->extra_info = frame_obstack_zalloc (size);
- return fi->extra_info;
+ if (frame->unwind == NULL)
+ /* Initialize the frame's unwinder because that's what
+ provides the frame's type. */
+ frame->unwind = frame_unwind_find_by_frame (frame->next,
+ &frame->prologue_cache);
+ return frame->unwind->type;
}
void
"{ deprecated_update_frame_pc_hack (frame=%d,pc=0x%s) }\n",
frame->level, paddr_nz (pc));
/* NOTE: cagney/2003-03-11: Some architectures (e.g., Arm) are
- maintaining a locally allocated frame object. Since such frame's
+ maintaining a locally allocated frame object. Since such frames
are not in the frame chain, it isn't possible to assume that the
frame has a next. Sigh. */
if (frame->next != NULL)
frame->this_id.value.stack_addr = base;
}
-struct frame_info *
-deprecated_frame_xmalloc_with_cleanup (long sizeof_saved_regs,
- long sizeof_extra_info)
-{
- struct frame_info *frame = XMALLOC (struct frame_info);
- memset (frame, 0, sizeof (*frame));
- frame->this_id.p = 1;
- make_cleanup (xfree, frame);
- if (sizeof_saved_regs > 0)
- {
- frame->saved_regs = xcalloc (1, sizeof_saved_regs);
- make_cleanup (xfree, frame->saved_regs);
- }
- if (sizeof_extra_info > 0)
- {
- frame->extra_info = xcalloc (1, sizeof_extra_info);
- make_cleanup (xfree, frame->extra_info);
- }
- return frame;
-}
-
/* Memory access methods. */
void
-get_frame_memory (struct frame_info *this_frame, CORE_ADDR addr, void *buf,
- int len)
+get_frame_memory (struct frame_info *this_frame, CORE_ADDR addr,
+ gdb_byte *buf, int len)
{
read_memory (addr, buf, len);
}
return read_memory_unsigned_integer (addr, len);
}
+int
+safe_frame_unwind_memory (struct frame_info *this_frame,
+ CORE_ADDR addr, gdb_byte *buf, int len)
+{
+ /* NOTE: read_memory_nobpt returns zero on success! */
+ return !read_memory_nobpt (addr, buf, len);
+}
+
/* Architecture method. */
struct gdbarch *
CORE_ADDR
frame_sp_unwind (struct frame_info *next_frame)
{
- /* Normality, an architecture that provides a way of obtaining any
+ /* Normality - an architecture that provides a way of obtaining any
frame inner-most address. */
if (gdbarch_unwind_sp_p (current_gdbarch))
return gdbarch_unwind_sp (current_gdbarch, next_frame);
/* Things are looking grim. If it's the inner-most frame and there
- is a TARGET_READ_SP then that can be used. */
+ is a TARGET_READ_SP, then that can be used. */
if (next_frame->level < 0 && TARGET_READ_SP_P ())
return TARGET_READ_SP ();
/* Now things are really are grim. Hope that the value returned by
frame_unwind_unsigned_register (next_frame, SP_REGNUM, &sp);
return sp;
}
- internal_error (__FILE__, __LINE__, "Missing unwind SP method");
+ internal_error (__FILE__, __LINE__, _("Missing unwind SP method"));
}
+/* Return the reason why we can't unwind past FRAME. */
-int
-legacy_frame_p (struct gdbarch *current_gdbarch)
+enum unwind_stop_reason
+get_frame_unwind_stop_reason (struct frame_info *frame)
{
- if (DEPRECATED_INIT_FRAME_PC_P ()
- || DEPRECATED_INIT_FRAME_PC_FIRST_P ()
- || DEPRECATED_INIT_EXTRA_FRAME_INFO_P ()
- || DEPRECATED_FRAME_CHAIN_P ())
- /* No question, it's a legacy frame. */
- return 1;
- if (gdbarch_unwind_dummy_id_p (current_gdbarch))
- /* No question, it's not a legacy frame (provided none of the
- deprecated methods checked above are present that is). */
- return 0;
- if (DEPRECATED_TARGET_READ_FP_P ()
- || DEPRECATED_FP_REGNUM >= 0)
- /* Assume it's legacy. If you're trying to convert a legacy frame
- target to the new mechanism, get rid of these. legacy
- get_prev_frame requires these when unwind_frame_id isn't
- available. */
- return 1;
- /* Default to assuming that it's brand new code, and hence not
- legacy. Force it down the non-legacy path so that the new code
- uses the new frame mechanism from day one. Dummy frame's won't
- work very well but we can live with that. */
- return 0;
+ /* If we haven't tried to unwind past this point yet, then assume
+ that unwinding would succeed. */
+ if (frame->prev_p == 0)
+ return UNWIND_NO_REASON;
+
+ /* Otherwise, we set a reason when we succeeded (or failed) to
+ unwind. */
+ return frame->stop_reason;
+}
+
+/* Return a string explaining REASON. */
+
+const char *
+frame_stop_reason_string (enum unwind_stop_reason reason)
+{
+ switch (reason)
+ {
+ case UNWIND_NULL_ID:
+ return _("unwinder did not report frame ID");
+
+ case UNWIND_INNER_ID:
+ return _("previous frame inner to this frame (corrupt stack?)");
+
+ case UNWIND_SAME_ID:
+ return _("previous frame identical to this frame (corrupt stack?)");
+
+ case UNWIND_NO_SAVED_PC:
+ return _("frame did not save the PC");
+
+ case UNWIND_NO_REASON:
+ case UNWIND_FIRST_ERROR:
+ default:
+ internal_error (__FILE__, __LINE__,
+ "Invalid frame stop reason");
+ }
}
extern initialize_file_ftype _initialize_frame; /* -Wmissing-prototypes */
{
obstack_init (&frame_cache_obstack);
- add_prefix_cmd ("backtrace", class_maintenance, set_backtrace_cmd, "\
+ observer_attach_target_changed (frame_observer_target_changed);
+
+ add_prefix_cmd ("backtrace", class_maintenance, set_backtrace_cmd, _("\
Set backtrace specific variables.\n\
-Configure backtrace variables such as the backtrace limit",
+Configure backtrace variables such as the backtrace limit"),
&set_backtrace_cmdlist, "set backtrace ",
0/*allow-unknown*/, &setlist);
- add_prefix_cmd ("backtrace", class_maintenance, show_backtrace_cmd, "\
+ add_prefix_cmd ("backtrace", class_maintenance, show_backtrace_cmd, _("\
Show backtrace specific variables\n\
-Show backtrace variables such as the backtrace limit",
+Show backtrace variables such as the backtrace limit"),
&show_backtrace_cmdlist, "show backtrace ",
0/*allow-unknown*/, &showlist);
add_setshow_boolean_cmd ("past-main", class_obscure,
- &backtrace_past_main, "\
-Set whether backtraces should continue past \"main\".\n\
-Normally the caller of \"main\" is not of interest, so GDB will terminate\n\
-the backtrace at \"main\". Set this variable if you need to see the rest\n\
-of the stack trace.", "\
-Show whether backtraces should continue past \"main\".\n\
+ &backtrace_past_main, _("\
+Set whether backtraces should continue past \"main\"."), _("\
+Show whether backtraces should continue past \"main\"."), _("\
Normally the caller of \"main\" is not of interest, so GDB will terminate\n\
the backtrace at \"main\". Set this variable if you need to see the rest\n\
-of the stack trace.",
- NULL, NULL, &set_backtrace_cmdlist,
+of the stack trace."),
+ NULL,
+ show_backtrace_past_main,
+ &set_backtrace_cmdlist,
&show_backtrace_cmdlist);
- add_setshow_uinteger_cmd ("limit", class_obscure,
- &backtrace_limit, "\
-Set an upper bound on the number of backtrace levels.\n\
+ add_setshow_boolean_cmd ("past-entry", class_obscure,
+ &backtrace_past_entry, _("\
+Set whether backtraces should continue past the entry point of a program."),
+ _("\
+Show whether backtraces should continue past the entry point of a program."),
+ _("\
+Normally there are no callers beyond the entry point of a program, so GDB\n\
+will terminate the backtrace there. Set this variable if you need to see \n\
+the rest of the stack trace."),
+ NULL,
+ show_backtrace_past_entry,
+ &set_backtrace_cmdlist,
+ &show_backtrace_cmdlist);
+
+ add_setshow_integer_cmd ("limit", class_obscure,
+ &backtrace_limit, _("\
+Set an upper bound on the number of backtrace levels."), _("\
+Show the upper bound on the number of backtrace levels."), _("\
No more than the specified number of frames can be displayed or examined.\n\
-Zero is unlimited.", "\
-Show the upper bound on the number of backtrace levels.",
- NULL, NULL, &set_backtrace_cmdlist,
- &show_backtrace_cmdlist);
+Zero is unlimited."),
+ NULL,
+ show_backtrace_limit,
+ &set_backtrace_cmdlist,
+ &show_backtrace_cmdlist);
/* Debug this files internals. */
- add_show_from_set (add_set_cmd ("frame", class_maintenance, var_zinteger,
- &frame_debug, "Set frame debugging.\n\
-When non-zero, frame specific internal debugging is enabled.", &setdebuglist),
- &showdebuglist);
+ add_setshow_zinteger_cmd ("frame", class_maintenance, &frame_debug, _("\
+Set frame debugging."), _("\
+Show frame debugging."), _("\
+When non-zero, frame specific internal debugging is enabled."),
+ NULL,
+ show_frame_debug,
+ &setdebuglist, &showdebuglist);
}
projects / deliverable / binutils-gdb.git / blobdiff