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[/] [openrisc/] [trunk/] [gnu-old/] [gdb-6.8/] [gdb/] [dummy-frame.c] - Diff between revs 157 and 816

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/* Code dealing with dummy stack frames, for GDB, the GNU debugger.
/* Code dealing with dummy stack frames, for GDB, the GNU debugger.
 
 
   Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
   Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
   1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2007, 2008
   1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2007, 2008
   Free Software Foundation, Inc.
   Free Software Foundation, Inc.
 
 
   This file is part of GDB.
   This file is part of GDB.
 
 
   This program is free software; you can redistribute it and/or modify
   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
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.
   (at your option) any later version.
 
 
   This program is distributed in the hope that it will be useful,
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   GNU General Public License for more details.
 
 
   You should have received a copy of the GNU General Public License
   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 
 
 
#include "defs.h"
#include "defs.h"
#include "dummy-frame.h"
#include "dummy-frame.h"
#include "regcache.h"
#include "regcache.h"
#include "frame.h"
#include "frame.h"
#include "inferior.h"
#include "inferior.h"
#include "gdb_assert.h"
#include "gdb_assert.h"
#include "frame-unwind.h"
#include "frame-unwind.h"
#include "command.h"
#include "command.h"
#include "gdbcmd.h"
#include "gdbcmd.h"
#include "gdb_string.h"
#include "gdb_string.h"
 
 
/* Dummy frame.  This saves the processor state just prior to setting
/* Dummy frame.  This saves the processor state just prior to setting
   up the inferior function call.  Older targets save the registers
   up the inferior function call.  Older targets save the registers
   on the target stack (but that really slows down function calls).  */
   on the target stack (but that really slows down function calls).  */
 
 
struct dummy_frame
struct dummy_frame
{
{
  struct dummy_frame *next;
  struct dummy_frame *next;
  /* This frame's ID.  Must match the value returned by
  /* This frame's ID.  Must match the value returned by
     gdbarch_unwind_dummy_id.  */
     gdbarch_unwind_dummy_id.  */
  struct frame_id id;
  struct frame_id id;
  /* The caller's regcache.  */
  /* The caller's regcache.  */
  struct regcache *regcache;
  struct regcache *regcache;
};
};
 
 
static struct dummy_frame *dummy_frame_stack = NULL;
static struct dummy_frame *dummy_frame_stack = NULL;
 
 
/* Function: deprecated_pc_in_call_dummy (pc)
/* Function: deprecated_pc_in_call_dummy (pc)
 
 
   Return non-zero if the PC falls in a dummy frame created by gdb for
   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
   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
   is for infrun.c, which may give the function a PC without that
   subtracted out.
   subtracted out.
 
 
   FIXME: cagney/2002-11-23: This is silly.  Surely "infrun.c" can
   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
   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
   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
   infrun.c:adjust_pc_after_break (thanks), this function is now
   always called with a correctly adjusted PC!
   always called with a correctly adjusted PC!
 
 
   NOTE: cagney/2004-08-02: Code should not need to call this.  */
   NOTE: cagney/2004-08-02: Code should not need to call this.  */
 
 
int
int
deprecated_pc_in_call_dummy (CORE_ADDR pc)
deprecated_pc_in_call_dummy (CORE_ADDR pc)
{
{
  struct dummy_frame *dummyframe;
  struct dummy_frame *dummyframe;
  for (dummyframe = dummy_frame_stack;
  for (dummyframe = dummy_frame_stack;
       dummyframe != NULL;
       dummyframe != NULL;
       dummyframe = dummyframe->next)
       dummyframe = dummyframe->next)
    {
    {
      if ((pc >= dummyframe->id.code_addr)
      if ((pc >= dummyframe->id.code_addr)
          && (pc <= dummyframe->id.code_addr
          && (pc <= dummyframe->id.code_addr
                    + gdbarch_decr_pc_after_break (current_gdbarch)))
                    + gdbarch_decr_pc_after_break (current_gdbarch)))
        return 1;
        return 1;
    }
    }
  return 0;
  return 0;
}
}
 
 
/* Push the caller's state, along with the dummy frame info, onto a
/* Push the caller's state, along with the dummy frame info, onto a
   dummy-frame stack.  */
   dummy-frame stack.  */
 
 
void
void
dummy_frame_push (struct regcache *caller_regcache,
dummy_frame_push (struct regcache *caller_regcache,
                  const struct frame_id *dummy_id)
                  const struct frame_id *dummy_id)
{
{
  struct gdbarch *gdbarch = get_regcache_arch (caller_regcache);
  struct gdbarch *gdbarch = get_regcache_arch (caller_regcache);
  struct dummy_frame *dummy_frame;
  struct dummy_frame *dummy_frame;
 
 
  /* Check to see if there are stale dummy frames, perhaps left over
  /* 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
     from when a longjump took us out of a function that was called by
     the debugger.  */
     the debugger.  */
  dummy_frame = dummy_frame_stack;
  dummy_frame = dummy_frame_stack;
  while (dummy_frame)
  while (dummy_frame)
    /* FIXME: cagney/2004-08-02: Should just test IDs.  */
    /* FIXME: cagney/2004-08-02: Should just test IDs.  */
    if (frame_id_inner (gdbarch, dummy_frame->id, (*dummy_id)))
    if (frame_id_inner (gdbarch, dummy_frame->id, (*dummy_id)))
      /* Stale -- destroy!  */
      /* Stale -- destroy!  */
      {
      {
        dummy_frame_stack = dummy_frame->next;
        dummy_frame_stack = dummy_frame->next;
        regcache_xfree (dummy_frame->regcache);
        regcache_xfree (dummy_frame->regcache);
        xfree (dummy_frame);
        xfree (dummy_frame);
        dummy_frame = dummy_frame_stack;
        dummy_frame = dummy_frame_stack;
      }
      }
    else
    else
      dummy_frame = dummy_frame->next;
      dummy_frame = dummy_frame->next;
 
 
  dummy_frame = XZALLOC (struct dummy_frame);
  dummy_frame = XZALLOC (struct dummy_frame);
  dummy_frame->regcache = caller_regcache;
  dummy_frame->regcache = caller_regcache;
  dummy_frame->id = (*dummy_id);
  dummy_frame->id = (*dummy_id);
  dummy_frame->next = dummy_frame_stack;
  dummy_frame->next = dummy_frame_stack;
  dummy_frame_stack = dummy_frame;
  dummy_frame_stack = dummy_frame;
}
}
 
 
/* Return the dummy frame cache, it contains both the ID, and a
/* Return the dummy frame cache, it contains both the ID, and a
   pointer to the regcache.  */
   pointer to the regcache.  */
struct dummy_frame_cache
struct dummy_frame_cache
{
{
  struct frame_id this_id;
  struct frame_id this_id;
  struct regcache *prev_regcache;
  struct regcache *prev_regcache;
};
};
 
 
int
int
dummy_frame_sniffer (const struct frame_unwind *self,
dummy_frame_sniffer (const struct frame_unwind *self,
                     struct frame_info *next_frame,
                     struct frame_info *next_frame,
                     void **this_prologue_cache)
                     void **this_prologue_cache)
{
{
  struct dummy_frame *dummyframe;
  struct dummy_frame *dummyframe;
  struct frame_id this_id;
  struct frame_id this_id;
 
 
  /* When unwinding a normal frame, the stack structure is determined
  /* When unwinding a normal frame, the stack structure is determined
     by analyzing the frame's function's code (be it using brute force
     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
     prologue analysis, or the dwarf2 CFI).  In the case of a dummy
     frame, that simply isn't possible.  The PC is either the program
     frame, that simply isn't possible.  The PC is either the program
     entry point, or some random address on the stack.  Trying to use
     entry point, or some random address on the stack.  Trying to use
     that PC to apply standard frame ID unwind techniques is just
     that PC to apply standard frame ID unwind techniques is just
     asking for trouble.  */
     asking for trouble.  */
 
 
  /* Don't bother unles there is at least one dummy frame.  */
  /* Don't bother unles there is at least one dummy frame.  */
  if (dummy_frame_stack != NULL)
  if (dummy_frame_stack != NULL)
    {
    {
      /* Use an architecture specific method to extract the prev's
      /* Use an architecture specific method to extract the prev's
         dummy ID from the next frame.  Note that this method uses
         dummy ID from the next frame.  Note that this method uses
         frame_register_unwind to obtain the register values needed to
         frame_register_unwind to obtain the register values needed to
         determine the dummy frame's ID.  */
         determine the dummy frame's ID.  */
      this_id = gdbarch_unwind_dummy_id (get_frame_arch (next_frame),
      this_id = gdbarch_unwind_dummy_id (get_frame_arch (next_frame),
                                         next_frame);
                                         next_frame);
 
 
      /* Use that ID to find the corresponding cache entry.  */
      /* Use that ID to find the corresponding cache entry.  */
      for (dummyframe = dummy_frame_stack;
      for (dummyframe = dummy_frame_stack;
           dummyframe != NULL;
           dummyframe != NULL;
           dummyframe = dummyframe->next)
           dummyframe = dummyframe->next)
        {
        {
          if (frame_id_eq (dummyframe->id, this_id))
          if (frame_id_eq (dummyframe->id, this_id))
            {
            {
              struct dummy_frame_cache *cache;
              struct dummy_frame_cache *cache;
              cache = FRAME_OBSTACK_ZALLOC (struct dummy_frame_cache);
              cache = FRAME_OBSTACK_ZALLOC (struct dummy_frame_cache);
              cache->prev_regcache = dummyframe->regcache;
              cache->prev_regcache = dummyframe->regcache;
              cache->this_id = this_id;
              cache->this_id = this_id;
              (*this_prologue_cache) = cache;
              (*this_prologue_cache) = cache;
              return 1;
              return 1;
            }
            }
        }
        }
    }
    }
  return 0;
  return 0;
}
}
 
 
/* Given a call-dummy dummy-frame, return the registers.  Here the
/* Given a call-dummy dummy-frame, return the registers.  Here the
   register value is taken from the local copy of the register buffer.  */
   register value is taken from the local copy of the register buffer.  */
 
 
static void
static void
dummy_frame_prev_register (struct frame_info *next_frame,
dummy_frame_prev_register (struct frame_info *next_frame,
                           void **this_prologue_cache,
                           void **this_prologue_cache,
                           int regnum, int *optimized,
                           int regnum, int *optimized,
                           enum lval_type *lvalp, CORE_ADDR *addrp,
                           enum lval_type *lvalp, CORE_ADDR *addrp,
                           int *realnum, gdb_byte *bufferp)
                           int *realnum, gdb_byte *bufferp)
{
{
  /* The dummy-frame sniffer always fills in the cache.  */
  /* The dummy-frame sniffer always fills in the cache.  */
  struct dummy_frame_cache *cache = (*this_prologue_cache);
  struct dummy_frame_cache *cache = (*this_prologue_cache);
  gdb_assert (cache != NULL);
  gdb_assert (cache != NULL);
 
 
  /* Describe the register's location.  Generic dummy frames always
  /* Describe the register's location.  Generic dummy frames always
     have the register value in an ``expression''.  */
     have the register value in an ``expression''.  */
  *optimized = 0;
  *optimized = 0;
  *lvalp = not_lval;
  *lvalp = not_lval;
  *addrp = 0;
  *addrp = 0;
  *realnum = -1;
  *realnum = -1;
 
 
  /* If needed, find and return the value of the register.  */
  /* If needed, find and return the value of the register.  */
  if (bufferp != NULL)
  if (bufferp != NULL)
    {
    {
      /* Return the actual value.  */
      /* Return the actual value.  */
      /* Use the regcache_cooked_read() method so that it, on the fly,
      /* Use the regcache_cooked_read() method so that it, on the fly,
         constructs either a raw or pseudo register from the raw
         constructs either a raw or pseudo register from the raw
         register cache.  */
         register cache.  */
      regcache_cooked_read (cache->prev_regcache, regnum, bufferp);
      regcache_cooked_read (cache->prev_regcache, regnum, bufferp);
    }
    }
}
}
 
 
/* Assuming that THIS frame is a dummy (remember, the NEXT and not
/* 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
   THIS frame is passed in), return the ID of THIS frame.  That ID is
   determined by examining the NEXT frame's unwound registers using
   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 unwind_dummy_id().  As a side effect, THIS dummy frame's
   dummy cache is located and and saved in THIS_PROLOGUE_CACHE.  */
   dummy cache is located and and saved in THIS_PROLOGUE_CACHE.  */
 
 
static void
static void
dummy_frame_this_id (struct frame_info *next_frame,
dummy_frame_this_id (struct frame_info *next_frame,
                     void **this_prologue_cache,
                     void **this_prologue_cache,
                     struct frame_id *this_id)
                     struct frame_id *this_id)
{
{
  /* The dummy-frame sniffer always fills in the cache.  */
  /* The dummy-frame sniffer always fills in the cache.  */
  struct dummy_frame_cache *cache = (*this_prologue_cache);
  struct dummy_frame_cache *cache = (*this_prologue_cache);
  gdb_assert (cache != NULL);
  gdb_assert (cache != NULL);
  (*this_id) = cache->this_id;
  (*this_id) = cache->this_id;
}
}
 
 
static const struct frame_unwind dummy_frame_unwinder =
static const struct frame_unwind dummy_frame_unwinder =
{
{
  DUMMY_FRAME,
  DUMMY_FRAME,
  dummy_frame_this_id,
  dummy_frame_this_id,
  dummy_frame_prev_register,
  dummy_frame_prev_register,
  NULL,
  NULL,
  dummy_frame_sniffer,
  dummy_frame_sniffer,
};
};
 
 
const struct frame_unwind *const dummy_frame_unwind = {
const struct frame_unwind *const dummy_frame_unwind = {
  &dummy_frame_unwinder
  &dummy_frame_unwinder
};
};
 
 
static void
static void
fprint_dummy_frames (struct ui_file *file)
fprint_dummy_frames (struct ui_file *file)
{
{
  struct dummy_frame *s;
  struct dummy_frame *s;
  for (s = dummy_frame_stack; s != NULL; s = s->next)
  for (s = dummy_frame_stack; s != NULL; s = s->next)
    {
    {
      gdb_print_host_address (s, file);
      gdb_print_host_address (s, file);
      fprintf_unfiltered (file, ":");
      fprintf_unfiltered (file, ":");
      fprintf_unfiltered (file, " id=");
      fprintf_unfiltered (file, " id=");
      fprint_frame_id (file, s->id);
      fprint_frame_id (file, s->id);
      fprintf_unfiltered (file, "\n");
      fprintf_unfiltered (file, "\n");
    }
    }
}
}
 
 
static void
static void
maintenance_print_dummy_frames (char *args, int from_tty)
maintenance_print_dummy_frames (char *args, int from_tty)
{
{
  if (args == NULL)
  if (args == NULL)
    fprint_dummy_frames (gdb_stdout);
    fprint_dummy_frames (gdb_stdout);
  else
  else
    {
    {
      struct ui_file *file = gdb_fopen (args, "w");
      struct ui_file *file = gdb_fopen (args, "w");
      if (file == NULL)
      if (file == NULL)
        perror_with_name (_("maintenance print dummy-frames"));
        perror_with_name (_("maintenance print dummy-frames"));
      fprint_dummy_frames (file);
      fprint_dummy_frames (file);
      ui_file_delete (file);
      ui_file_delete (file);
    }
    }
}
}
 
 
extern void _initialize_dummy_frame (void);
extern void _initialize_dummy_frame (void);
 
 
void
void
_initialize_dummy_frame (void)
_initialize_dummy_frame (void)
{
{
  add_cmd ("dummy-frames", class_maintenance, maintenance_print_dummy_frames,
  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);
           &maintenanceprintlist);
 
 
}
}
 
 

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