gdb/mi/mi-cmd-stack.c - binutils-gdb - Git at Google

 /* MI Command Set - stack commands.
    Copyright (C) 2000-2021 Free Software Foundation, Inc.
    Contributed by Cygnus Solutions (a Red Hat company).

    This file is part of GDB.

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

 #include "defs.h"
 #include "target.h"
 #include "frame.h"
 #include "value.h"
 #include "mi-cmds.h"
 #include "ui-out.h"
 #include "symtab.h"
 #include "block.h"
 #include "stack.h"
 #include "dictionary.h"
 #include "language.h"
 #include "valprint.h"
 #include "utils.h"
 #include "mi-getopt.h"
 #include "extension.h"
 #include <ctype.h>
 #include "mi-parse.h"
 #include "gdbsupport/gdb_optional.h"
 #include "safe-ctype.h"

 enum what_to_list { locals, arguments, all };

 static void list_args_or_locals (const frame_print_options &fp_opts,
 				 enum what_to_list what,
 				 enum print_values values,
 				 struct frame_info *fi,
 				 int skip_unavailable);

 /* True if we want to allow Python-based frame filters.  */
 static int frame_filters = 0;

 void
 mi_cmd_enable_frame_filters (const char *command, char **argv, int argc)
 {
   if (argc != 0)
     error (_("-enable-frame-filters: no arguments allowed"));
   frame_filters = 1;
 }

 /* Like apply_ext_lang_frame_filter, but take a print_values */

 static enum ext_lang_bt_status
 mi_apply_ext_lang_frame_filter (struct frame_info *frame,
 				frame_filter_flags flags,
 				enum print_values print_values,
 				struct ui_out *out,
 				int frame_low, int frame_high)
 {
   /* ext_lang_frame_args's MI options are compatible with MI print
      values.  */
   return apply_ext_lang_frame_filter (frame, flags,
 				      (enum ext_lang_frame_args) print_values,
 				      out,
 				      frame_low, frame_high);
 }

 /* Print a list of the stack frames.  Args can be none, in which case
    we want to print the whole backtrace, or a pair of numbers
    specifying the frame numbers at which to start and stop the
    display.  If the two numbers are equal, a single frame will be
    displayed.  */

 void
 mi_cmd_stack_list_frames (const char *command, char **argv, int argc)
 {
   int frame_low;
   int frame_high;
   int i;
   struct frame_info *fi;
   enum ext_lang_bt_status result = EXT_LANG_BT_ERROR;
   int raw_arg = 0;
   int oind = 0;
   enum opt
     {
       NO_FRAME_FILTERS
     };
   static const struct mi_opt opts[] =
     {
       {"-no-frame-filters", NO_FRAME_FILTERS, 0},
       { 0, 0, 0 }
     };

   /* Parse arguments.  In this instance we are just looking for
      --no-frame-filters.  */
   while (1)
     {
       char *oarg;
       int opt = mi_getopt ("-stack-list-frames", argc, argv,
 			   opts, &oind, &oarg);
       if (opt < 0)
 	break;
       switch ((enum opt) opt)
 	{
 	case NO_FRAME_FILTERS:
 	  raw_arg = oind;
 	  break;
 	}
     }

   /* After the last option is parsed, there should either be low -
      high range, or no further arguments.  */
   if ((argc - oind != 0) && (argc - oind != 2))
     error (_("-stack-list-frames: Usage: [--no-frame-filters] [FRAME_LOW FRAME_HIGH]"));

   /* If there is a range, set it.  */
   if (argc - oind == 2)
     {
       frame_low = atoi (argv[0 + oind]);
       frame_high = atoi (argv[1 + oind]);
     }
   else
     {
       /* Called with no arguments, it means we want the whole
 	 backtrace.  */
       frame_low = -1;
       frame_high = -1;
     }

   /* Let's position fi on the frame at which to start the
      display. Could be the innermost frame if the whole stack needs
      displaying, or if frame_low is 0.  */
   for (i = 0, fi = get_current_frame ();
        fi && i < frame_low;
        i++, fi = get_prev_frame (fi));

   if (fi == NULL)
     error (_("-stack-list-frames: Not enough frames in stack."));

   ui_out_emit_list list_emitter (current_uiout, "stack");

   if (! raw_arg && frame_filters)
     {
       frame_filter_flags flags = PRINT_LEVEL | PRINT_FRAME_INFO;
       int py_frame_low = frame_low;

       /* We cannot pass -1 to frame_low, as that would signify a
       relative backtrace from the tail of the stack.  So, in the case
       of frame_low == -1, assign and increment it.  */
       if (py_frame_low == -1)
 	py_frame_low++;

       result = apply_ext_lang_frame_filter (get_current_frame (), flags,
 					    NO_VALUES,  current_uiout,
 					    py_frame_low, frame_high);
     }

   /* Run the inbuilt backtrace if there are no filters registered, or
      if "--no-frame-filters" has been specified from the command.  */
   if (! frame_filters || raw_arg  || result == EXT_LANG_BT_NO_FILTERS)
     {
       /* Now let's print the frames up to frame_high, or until there are
 	 frames in the stack.  */
       for (;
 	   fi && (i <= frame_high || frame_high == -1);
 	   i++, fi = get_prev_frame (fi))
 	{
 	  QUIT;
 	  /* Print the location and the address always, even for level 0.
 	     If args is 0, don't print the arguments.  */
 	  print_frame_info (user_frame_print_options,
 			    fi, 1, LOC_AND_ADDRESS, 0 /* args */, 0);
 	}
     }
 }

 void
 mi_cmd_stack_info_depth (const char *command, char **argv, int argc)
 {
   int frame_high;
   int i;
   struct frame_info *fi;

   if (argc > 1)
     error (_("-stack-info-depth: Usage: [MAX_DEPTH]"));

   if (argc == 1)
     frame_high = atoi (argv[0]);
   else
     /* Called with no arguments, it means we want the real depth of
        the stack.  */
     frame_high = -1;

   for (i = 0, fi = get_current_frame ();
        fi && (i < frame_high || frame_high == -1);
        i++, fi = get_prev_frame (fi))
     QUIT;

   current_uiout->field_signed ("depth", i);
 }

 /* Print a list of the locals for the current frame.  With argument of
    0, print only the names, with argument of 1 print also the
    values.  */

 void
 mi_cmd_stack_list_locals (const char *command, char **argv, int argc)
 {
   struct frame_info *frame;
   int raw_arg = 0;
   enum ext_lang_bt_status result = EXT_LANG_BT_ERROR;
   enum print_values print_value;
   int oind = 0;
   int skip_unavailable = 0;

   if (argc > 1)
     {
       enum opt
       {
 	NO_FRAME_FILTERS,
 	SKIP_UNAVAILABLE,
       };
       static const struct mi_opt opts[] =
 	{
 	  {"-no-frame-filters", NO_FRAME_FILTERS, 0},
 	  {"-skip-unavailable", SKIP_UNAVAILABLE, 0},
 	  { 0, 0, 0 }
 	};

       while (1)
 	{
 	  char *oarg;
 	  /* Don't parse 'print-values' as an option.  */
 	  int opt = mi_getopt ("-stack-list-locals", argc - 1, argv,
 			       opts, &oind, &oarg);

 	  if (opt < 0)
 	    break;
 	  switch ((enum opt) opt)
 	    {
 	    case NO_FRAME_FILTERS:
 	      raw_arg = oind;
 	      break;
 	    case SKIP_UNAVAILABLE:
 	      skip_unavailable = 1;
 	      break;
 	    }
 	}
     }

   /* After the last option is parsed, there should be only
      'print-values'.  */
   if (argc - oind != 1)
     error (_("-stack-list-locals: Usage: [--no-frame-filters] "
 	     "[--skip-unavailable] PRINT_VALUES"));

   frame = get_selected_frame (NULL);
   print_value = mi_parse_print_values (argv[oind]);

    if (! raw_arg && frame_filters)
      {
        frame_filter_flags flags = PRINT_LEVEL | PRINT_LOCALS;

        result = mi_apply_ext_lang_frame_filter (frame, flags, print_value,
 						current_uiout, 0, 0);
      }

    /* Run the inbuilt backtrace if there are no filters registered, or
       if "--no-frame-filters" has been specified from the command.  */
    if (! frame_filters || raw_arg  || result == EXT_LANG_BT_NO_FILTERS)
      {
        list_args_or_locals (user_frame_print_options,
 			    locals, print_value, frame,
 			    skip_unavailable);
      }
 }

 /* Print a list of the arguments for the current frame.  With argument
    of 0, print only the names, with argument of 1 print also the
    values.  */

 void
 mi_cmd_stack_list_args (const char *command, char **argv, int argc)
 {
   int frame_low;
   int frame_high;
   int i;
   struct frame_info *fi;
   enum print_values print_values;
   struct ui_out *uiout = current_uiout;
   int raw_arg = 0;
   int oind = 0;
   int skip_unavailable = 0;
   enum ext_lang_bt_status result = EXT_LANG_BT_ERROR;
   enum opt
   {
     NO_FRAME_FILTERS,
     SKIP_UNAVAILABLE,
   };
   static const struct mi_opt opts[] =
     {
       {"-no-frame-filters", NO_FRAME_FILTERS, 0},
       {"-skip-unavailable", SKIP_UNAVAILABLE, 0},
       { 0, 0, 0 }
     };

   while (1)
     {
       char *oarg;
       int opt = mi_getopt_allow_unknown ("-stack-list-args", argc, argv,
 					 opts, &oind, &oarg);

       if (opt < 0)
 	break;
       switch ((enum opt) opt)
 	{
 	case NO_FRAME_FILTERS:
 	  raw_arg = oind;
 	  break;
 	case SKIP_UNAVAILABLE:
 	  skip_unavailable = 1;
 	  break;
 	}
     }

   if (argc - oind != 1 && argc - oind != 3)
     error (_("-stack-list-arguments: Usage: "	\
 	     "[--no-frame-filters] [--skip-unavailable] "
 	     "PRINT_VALUES [FRAME_LOW FRAME_HIGH]"));

   if (argc - oind == 3)
     {
       frame_low = atoi (argv[1 + oind]);
       frame_high = atoi (argv[2 + oind]);
     }
   else
     {
       /* Called with no arguments, it means we want args for the whole
 	 backtrace.  */
       frame_low = -1;
       frame_high = -1;
     }

   print_values = mi_parse_print_values (argv[oind]);

   /* Let's position fi on the frame at which to start the
      display. Could be the innermost frame if the whole stack needs
      displaying, or if frame_low is 0.  */
   for (i = 0, fi = get_current_frame ();
        fi && i < frame_low;
        i++, fi = get_prev_frame (fi));

   if (fi == NULL)
     error (_("-stack-list-arguments: Not enough frames in stack."));

   ui_out_emit_list list_emitter (uiout, "stack-args");

   if (! raw_arg && frame_filters)
     {
       frame_filter_flags flags = PRINT_LEVEL | PRINT_ARGS;
       int py_frame_low = frame_low;

       /* We cannot pass -1 to frame_low, as that would signify a
       relative backtrace from the tail of the stack.  So, in the case
       of frame_low == -1, assign and increment it.  */
       if (py_frame_low == -1)
 	py_frame_low++;

       result = mi_apply_ext_lang_frame_filter (get_current_frame (), flags,
 					       print_values, current_uiout,
 					       py_frame_low, frame_high);
     }

      /* Run the inbuilt backtrace if there are no filters registered, or
       if "--no-frame-filters" has been specified from the command.  */
    if (! frame_filters || raw_arg  || result == EXT_LANG_BT_NO_FILTERS)
      {
       /* Now let's print the frames up to frame_high, or until there are
 	 frames in the stack.  */
       for (;
 	   fi && (i <= frame_high || frame_high == -1);
 	   i++, fi = get_prev_frame (fi))
 	{
 	  QUIT;
 	  ui_out_emit_tuple tuple_emitter (uiout, "frame");
 	  uiout->field_signed ("level", i);
 	  list_args_or_locals (user_frame_print_options,
 			       arguments, print_values, fi, skip_unavailable);
 	}
     }
 }

 /* Print a list of the local variables (including arguments) for the
    current frame.  ARGC must be 1 and ARGV[0] specify if only the names,
    or both names and values of the variables must be printed.  See
    parse_print_value for possible values.  */

 void
 mi_cmd_stack_list_variables (const char *command, char **argv, int argc)
 {
   struct frame_info *frame;
   int raw_arg = 0;
   enum ext_lang_bt_status result = EXT_LANG_BT_ERROR;
   enum print_values print_value;
   int oind = 0;
   int skip_unavailable = 0;

   if (argc > 1)
     {
       enum opt
       {
 	NO_FRAME_FILTERS,
 	SKIP_UNAVAILABLE,
       };
       static const struct mi_opt opts[] =
 	{
 	  {"-no-frame-filters", NO_FRAME_FILTERS, 0},
 	  {"-skip-unavailable", SKIP_UNAVAILABLE, 0},
 	  { 0, 0, 0 }
 	};

       while (1)
 	{
 	  char *oarg;
 	  /* Don't parse 'print-values' as an option.  */
 	  int opt = mi_getopt ("-stack-list-variables", argc - 1,
 			       argv, opts, &oind, &oarg);
 	  if (opt < 0)
 	    break;
 	  switch ((enum opt) opt)
 	    {
 	    case NO_FRAME_FILTERS:
 	      raw_arg = oind;
 	      break;
 	    case SKIP_UNAVAILABLE:
 	      skip_unavailable = 1;
 	      break;
 	    }
 	}
     }

   /* After the last option is parsed, there should be only
      'print-values'.  */
   if (argc - oind != 1)
     error (_("-stack-list-variables: Usage: [--no-frame-filters] " \
 	     "[--skip-unavailable] PRINT_VALUES"));

    frame = get_selected_frame (NULL);
    print_value = mi_parse_print_values (argv[oind]);

    if (! raw_arg && frame_filters)
      {
        frame_filter_flags flags = PRINT_LEVEL | PRINT_ARGS | PRINT_LOCALS;

        result = mi_apply_ext_lang_frame_filter (frame, flags,
 						print_value,
 						current_uiout, 0, 0);
      }

    /* Run the inbuilt backtrace if there are no filters registered, or
       if "--no-frame-filters" has been specified from the command.  */
    if (! frame_filters || raw_arg  || result == EXT_LANG_BT_NO_FILTERS)
      {
        list_args_or_locals (user_frame_print_options,
 			    all, print_value, frame,
 			    skip_unavailable);
      }
 }

 /* Print single local or argument.  ARG must be already read in.  For
    WHAT and VALUES see list_args_or_locals.

    Errors are printed as if they would be the parameter value.  Use
    zeroed ARG iff it should not be printed according to VALUES.  If
    SKIP_UNAVAILABLE is true, only print ARG if it is available.  */

 static void
 list_arg_or_local (const struct frame_arg *arg, enum what_to_list what,
 		   enum print_values values, int skip_unavailable)
 {
   struct ui_out *uiout = current_uiout;

   gdb_assert (!arg->val || !arg->error);
   gdb_assert ((values == PRINT_NO_VALUES && arg->val == NULL
 	       && arg->error == NULL)
 	      || values == PRINT_SIMPLE_VALUES
 	      || (values == PRINT_ALL_VALUES
 		  && (arg->val != NULL || arg->error != NULL)));
   gdb_assert (arg->entry_kind == print_entry_values_no
 	      || (arg->entry_kind == print_entry_values_only
 		  && (arg->val || arg->error)));

   if (skip_unavailable && arg->val != NULL
       && (value_entirely_unavailable (arg->val)
 	  /* A scalar object that does not have all bits available is
 	     also considered unavailable, because all bits contribute
 	     to its representation.  */
 	  || (val_print_scalar_type_p (value_type (arg->val))
 	      && !value_bytes_available (arg->val,
 					 value_embedded_offset (arg->val),
 					 TYPE_LENGTH (value_type (arg->val))))))
     return;

   gdb::optional<ui_out_emit_tuple> tuple_emitter;
   if (values != PRINT_NO_VALUES || what == all)
     tuple_emitter.emplace (uiout, nullptr);

   string_file stb;

   stb.puts (arg->sym->print_name ());
   if (arg->entry_kind == print_entry_values_only)
     stb.puts ("@entry");
   uiout->field_stream ("name", stb);

   if (what == all && SYMBOL_IS_ARGUMENT (arg->sym))
     uiout->field_signed ("arg", 1);

   if (values == PRINT_SIMPLE_VALUES)
     {
       check_typedef (arg->sym->type);
       type_print (arg->sym->type, "", &stb, -1);
       uiout->field_stream ("type", stb);
     }

   if (arg->val || arg->error)
     {
       if (arg->error)
 	stb.printf (_("<error reading variable: %s>"), arg->error.get ());
       else
 	{
 	  try
 	    {
 	      struct value_print_options opts;

 	      get_no_prettyformat_print_options (&opts);
 	      opts.deref_ref = 1;
 	      common_val_print (arg->val, &stb, 0, &opts,
 				language_def (arg->sym->language ()));
 	    }
 	  catch (const gdb_exception_error &except)
 	    {
 	      stb.printf (_("<error reading variable: %s>"),
 			  except.what ());
 	    }
 	}
       uiout->field_stream ("value", stb);
     }
 }

 /* Print a list of the objects for the frame FI in a certain form,
    which is determined by VALUES.  The objects can be locals,
    arguments or both, which is determined by WHAT.  If SKIP_UNAVAILABLE
    is true, only print the arguments or local variables whose values
    are available.  */

 static void
 list_args_or_locals (const frame_print_options &fp_opts,
 		     enum what_to_list what, enum print_values values,
 		     struct frame_info *fi, int skip_unavailable)
 {
   const struct block *block;
   struct symbol *sym;
   struct block_iterator iter;
   struct type *type;
   const char *name_of_result;
   struct ui_out *uiout = current_uiout;

   block = get_frame_block (fi, 0);

   switch (what)
     {
     case locals:
       name_of_result = "locals";
       break;
     case arguments:
       name_of_result = "args";
       break;
     case all:
       name_of_result = "variables";
       break;
     default:
       internal_error (__FILE__, __LINE__,
 		      "unexpected what_to_list: %d", (int) what);
     }

   ui_out_emit_list list_emitter (uiout, name_of_result);

   while (block != 0)
     {
       ALL_BLOCK_SYMBOLS (block, iter, sym)
 	{
 	  int print_me = 0;

 	  switch (SYMBOL_CLASS (sym))
 	    {
 	    default:
 	    case LOC_UNDEF:	/* catches errors        */
 	    case LOC_CONST:	/* constant              */
 	    case LOC_TYPEDEF:	/* local typedef         */
 	    case LOC_LABEL:	/* local label           */
 	    case LOC_BLOCK:	/* local function        */
 	    case LOC_CONST_BYTES:	/* loc. byte seq.        */
 	    case LOC_UNRESOLVED:	/* unresolved static     */
 	    case LOC_OPTIMIZED_OUT:	/* optimized out         */
 	      print_me = 0;
 	      break;

 	    case LOC_ARG:	/* argument              */
 	    case LOC_REF_ARG:	/* reference arg         */
 	    case LOC_REGPARM_ADDR:	/* indirect register arg */
 	    case LOC_LOCAL:	/* stack local           */
 	    case LOC_STATIC:	/* static                */
 	    case LOC_REGISTER:	/* register              */
 	    case LOC_COMPUTED:	/* computed location     */
 	      if (what == all)
 		print_me = 1;
 	      else if (what == locals)
 		print_me = !SYMBOL_IS_ARGUMENT (sym);
 	      else
 		print_me = SYMBOL_IS_ARGUMENT (sym);
 	      break;
 	    }
 	  if (print_me)
 	    {
 	      struct symbol *sym2;
 	      struct frame_arg arg, entryarg;

 	      if (SYMBOL_IS_ARGUMENT (sym))
 		sym2 = lookup_symbol_search_name (sym->search_name (),
 						  block, VAR_DOMAIN).symbol;
 	      else
 		sym2 = sym;
 	      gdb_assert (sym2 != NULL);

 	      arg.sym = sym2;
 	      arg.entry_kind = print_entry_values_no;
 	      entryarg.sym = sym2;
 	      entryarg.entry_kind = print_entry_values_no;

 	      switch (values)
 		{
 		case PRINT_SIMPLE_VALUES:
 		  type = check_typedef (sym2->type);
 		  if (type->code () != TYPE_CODE_ARRAY
 		      && type->code () != TYPE_CODE_STRUCT
 		      && type->code () != TYPE_CODE_UNION)
 		    {
 		case PRINT_ALL_VALUES:
 		  if (SYMBOL_IS_ARGUMENT (sym))
 		    read_frame_arg (fp_opts, sym2, fi, &arg, &entryarg);
 		  else
 		    read_frame_local (sym2, fi, &arg);
 		    }
 		  break;
 		}

 	      if (arg.entry_kind != print_entry_values_only)
 		list_arg_or_local (&arg, what, values, skip_unavailable);
 	      if (entryarg.entry_kind != print_entry_values_no)
 		list_arg_or_local (&entryarg, what, values, skip_unavailable);
 	    }
 	}

       if (BLOCK_FUNCTION (block))
 	break;
       else
 	block = BLOCK_SUPERBLOCK (block);
     }
 }

 /* Read a frame specification from FRAME_EXP and return the selected frame.
    Call error() if the specification is in any way invalid (so this
    function never returns NULL).

    The frame specification is usually an integer level number, however if
    the number does not match a valid frame level then it will be treated as
    a frame address.  The frame address will then be used to find a matching
    frame in the stack.  If no matching frame is found then a new frame will
    be created.

    The use of FRAME_EXP as an address is undocumented in the GDB user
    manual, this feature is supported here purely for backward
    compatibility.  */

 static struct frame_info *
 parse_frame_specification (const char *frame_exp)
 {
   gdb_assert (frame_exp != NULL);

   /* NOTE: Parse and evaluate expression, but do not use
      functions such as parse_and_eval_long or
      parse_and_eval_address to also extract the value.
      Instead value_as_long and value_as_address are used.
      This avoids problems with expressions that contain
      side-effects.  */
   struct value *arg = parse_and_eval (frame_exp);

   /* Assume ARG is an integer, and try using that to select a frame.  */
   struct frame_info *fid;
   int level = value_as_long (arg);

   fid = find_relative_frame (get_current_frame (), &level);
   if (level == 0)
     /* find_relative_frame was successful.  */
     return fid;

   /* Convert the value into a corresponding address.  */
   CORE_ADDR addr = value_as_address (arg);

   /* Assume that ADDR is an address, use that to identify a frame with a
      matching ID.  */
   struct frame_id id = frame_id_build_wild (addr);

   /* If (s)he specifies the frame with an address, he deserves
      what (s)he gets.  Still, give the highest one that matches.
      (NOTE: cagney/2004-10-29: Why highest, or outer-most, I don't
      know).  */
   for (fid = get_current_frame ();
        fid != NULL;
        fid = get_prev_frame (fid))
     {
       if (frame_id_eq (id, get_frame_id (fid)))
 	{
 	  struct frame_info *prev_frame;

 	  while (1)
 	    {
 	      prev_frame = get_prev_frame (fid);
 	      if (!prev_frame
 		  || !frame_id_eq (id, get_frame_id (prev_frame)))
 		break;
 	      fid = prev_frame;
 	    }
 	  return fid;
 	}
     }

   /* We couldn't identify the frame as an existing frame, but
      perhaps we can create one with a single argument.  */
   return create_new_frame (addr, 0);
 }

 /* Implement the -stack-select-frame MI command.  */

 void
 mi_cmd_stack_select_frame (const char *command, char **argv, int argc)
 {
   if (argc == 0 || argc > 1)
     error (_("-stack-select-frame: Usage: FRAME_SPEC"));

   select_frame_for_mi (parse_frame_specification (argv[0]));
 }

 void
 mi_cmd_stack_info_frame (const char *command, char **argv, int argc)
 {
   if (argc > 0)
     error (_("-stack-info-frame: No arguments allowed"));

   print_frame_info (user_frame_print_options,
 		    get_selected_frame (NULL), 1, LOC_AND_ADDRESS, 0, 1);
 }
	/* MI Command Set - stack commands.
	Copyright (C) 2000-2021 Free Software Foundation, Inc.
	Contributed by Cygnus Solutions (a Red Hat company).

	This file is part of GDB.

	This program is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 3 of the License, or
	(at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program. If not, see <http://www.gnu.org/licenses/>. */

	#include "defs.h"
	#include "target.h"
	#include "frame.h"
	#include "value.h"
	#include "mi-cmds.h"
	#include "ui-out.h"
	#include "symtab.h"
	#include "block.h"
	#include "stack.h"
	#include "dictionary.h"
	#include "language.h"
	#include "valprint.h"
	#include "utils.h"
	#include "mi-getopt.h"
	#include "extension.h"
	#include <ctype.h>
	#include "mi-parse.h"
	#include "gdbsupport/gdb_optional.h"
	#include "safe-ctype.h"

	enum what_to_list { locals, arguments, all };

	static void list_args_or_locals (const frame_print_options &fp_opts,
	enum what_to_list what,
	enum print_values values,
	struct frame_info *fi,
	int skip_unavailable);

	/* True if we want to allow Python-based frame filters. */
	static int frame_filters = 0;

	void
	mi_cmd_enable_frame_filters (const char command, char *argv, int argc)
	{
	if (argc != 0)
	error (_("-enable-frame-filters: no arguments allowed"));
	frame_filters = 1;
	}

	/* Like apply_ext_lang_frame_filter, but take a print_values */

	static enum ext_lang_bt_status
	mi_apply_ext_lang_frame_filter (struct frame_info *frame,
	frame_filter_flags flags,
	enum print_values print_values,
	struct ui_out *out,
	int frame_low, int frame_high)
	{
	/* ext_lang_frame_args's MI options are compatible with MI print
	values. */
	return apply_ext_lang_frame_filter (frame, flags,
	(enum ext_lang_frame_args) print_values,
	out,
	frame_low, frame_high);
	}

	/* Print a list of the stack frames. Args can be none, in which case
	we want to print the whole backtrace, or a pair of numbers
	specifying the frame numbers at which to start and stop the
	display. If the two numbers are equal, a single frame will be
	displayed. */

	void
	mi_cmd_stack_list_frames (const char command, char *argv, int argc)
	{
	int frame_low;
	int frame_high;
	int i;
	struct frame_info *fi;
	enum ext_lang_bt_status result = EXT_LANG_BT_ERROR;
	int raw_arg = 0;
	int oind = 0;
	enum opt
	{
	NO_FRAME_FILTERS
	};
	static const struct mi_opt opts[] =
	{
	{"-no-frame-filters", NO_FRAME_FILTERS, 0},
	{ 0, 0, 0 }
	};

	/* Parse arguments. In this instance we are just looking for
	--no-frame-filters. */
	while (1)
	{
	char *oarg;
	int opt = mi_getopt ("-stack-list-frames", argc, argv,
	opts, &oind, &oarg);
	if (opt < 0)
	break;
	switch ((enum opt) opt)
	{
	case NO_FRAME_FILTERS:
	raw_arg = oind;
	break;
	}
	}

	/* After the last option is parsed, there should either be low -
	high range, or no further arguments. */
	if ((argc - oind != 0) && (argc - oind != 2))
	error (_("-stack-list-frames: Usage: [--no-frame-filters] [FRAME_LOW FRAME_HIGH]"));

	/* If there is a range, set it. */
	if (argc - oind == 2)
	{
	frame_low = atoi (argv[0 + oind]);
	frame_high = atoi (argv[1 + oind]);
	}
	else
	{
	/* Called with no arguments, it means we want the whole
	backtrace. */
	frame_low = -1;
	frame_high = -1;
	}

	/* Let's position fi on the frame at which to start the
	display. Could be the innermost frame if the whole stack needs
	displaying, or if frame_low is 0. */
	for (i = 0, fi = get_current_frame ();
	fi && i < frame_low;
	i++, fi = get_prev_frame (fi));

	if (fi == NULL)
	error (_("-stack-list-frames: Not enough frames in stack."));

	ui_out_emit_list list_emitter (current_uiout, "stack");

	if (! raw_arg && frame_filters)
	{
	frame_filter_flags flags = PRINT_LEVEL \| PRINT_FRAME_INFO;
	int py_frame_low = frame_low;

	/* We cannot pass -1 to frame_low, as that would signify a
	relative backtrace from the tail of the stack. So, in the case
	of frame_low == -1, assign and increment it. */
	if (py_frame_low == -1)
	py_frame_low++;

	result = apply_ext_lang_frame_filter (get_current_frame (), flags,
	NO_VALUES, current_uiout,
	py_frame_low, frame_high);
	}

	/* Run the inbuilt backtrace if there are no filters registered, or
	if "--no-frame-filters" has been specified from the command. */
	if (! frame_filters \|\| raw_arg \|\| result == EXT_LANG_BT_NO_FILTERS)
	{
	/* Now let's print the frames up to frame_high, or until there are
	frames in the stack. */
	for (;
	fi && (i <= frame_high \|\| frame_high == -1);
	i++, fi = get_prev_frame (fi))
	{
	QUIT;
	/* Print the location and the address always, even for level 0.
	If args is 0, don't print the arguments. */
	print_frame_info (user_frame_print_options,
	fi, 1, LOC_AND_ADDRESS, 0 /* args */, 0);
	}
	}
	}

	void
	mi_cmd_stack_info_depth (const char command, char *argv, int argc)
	{
	int frame_high;
	int i;
	struct frame_info *fi;

	if (argc > 1)
	error (_("-stack-info-depth: Usage: [MAX_DEPTH]"));

	if (argc == 1)
	frame_high = atoi (argv[0]);
	else
	/* Called with no arguments, it means we want the real depth of
	the stack. */
	frame_high = -1;

	for (i = 0, fi = get_current_frame ();
	fi && (i < frame_high \|\| frame_high == -1);
	i++, fi = get_prev_frame (fi))
	QUIT;

	current_uiout->field_signed ("depth", i);
	}

	/* Print a list of the locals for the current frame. With argument of
	0, print only the names, with argument of 1 print also the
	values. */

	void
	mi_cmd_stack_list_locals (const char command, char *argv, int argc)
	{
	struct frame_info *frame;
	int raw_arg = 0;
	enum ext_lang_bt_status result = EXT_LANG_BT_ERROR;
	enum print_values print_value;
	int oind = 0;
	int skip_unavailable = 0;

	if (argc > 1)
	{
	enum opt
	{
	NO_FRAME_FILTERS,
	SKIP_UNAVAILABLE,
	};
	static const struct mi_opt opts[] =
	{
	{"-no-frame-filters", NO_FRAME_FILTERS, 0},
	{"-skip-unavailable", SKIP_UNAVAILABLE, 0},
	{ 0, 0, 0 }
	};

	while (1)
	{
	char *oarg;
	/* Don't parse 'print-values' as an option. */
	int opt = mi_getopt ("-stack-list-locals", argc - 1, argv,
	opts, &oind, &oarg);

	if (opt < 0)
	break;
	switch ((enum opt) opt)
	{
	case NO_FRAME_FILTERS:
	raw_arg = oind;
	break;
	case SKIP_UNAVAILABLE:
	skip_unavailable = 1;
	break;
	}
	}
	}

	/* After the last option is parsed, there should be only
	'print-values'. */
	if (argc - oind != 1)
	error (_("-stack-list-locals: Usage: [--no-frame-filters] "
	"[--skip-unavailable] PRINT_VALUES"));

	frame = get_selected_frame (NULL);
	print_value = mi_parse_print_values (argv[oind]);

	if (! raw_arg && frame_filters)
	{
	frame_filter_flags flags = PRINT_LEVEL \| PRINT_LOCALS;

	result = mi_apply_ext_lang_frame_filter (frame, flags, print_value,
	current_uiout, 0, 0);
	}

	/* Run the inbuilt backtrace if there are no filters registered, or
	if "--no-frame-filters" has been specified from the command. */
	if (! frame_filters \|\| raw_arg \|\| result == EXT_LANG_BT_NO_FILTERS)
	{
	list_args_or_locals (user_frame_print_options,
	locals, print_value, frame,
	skip_unavailable);
	}
	}

	/* Print a list of the arguments for the current frame. With argument
	of 0, print only the names, with argument of 1 print also the
	values. */

	void
	mi_cmd_stack_list_args (const char command, char *argv, int argc)
	{
	int frame_low;
	int frame_high;
	int i;
	struct frame_info *fi;
	enum print_values print_values;
	struct ui_out *uiout = current_uiout;
	int raw_arg = 0;
	int oind = 0;
	int skip_unavailable = 0;
	enum ext_lang_bt_status result = EXT_LANG_BT_ERROR;
	enum opt
	{
	NO_FRAME_FILTERS,
	SKIP_UNAVAILABLE,
	};
	static const struct mi_opt opts[] =
	{
	{"-no-frame-filters", NO_FRAME_FILTERS, 0},
	{"-skip-unavailable", SKIP_UNAVAILABLE, 0},
	{ 0, 0, 0 }
	};

	while (1)
	{
	char *oarg;
	int opt = mi_getopt_allow_unknown ("-stack-list-args", argc, argv,
	opts, &oind, &oarg);

	if (opt < 0)
	break;
	switch ((enum opt) opt)
	{
	case NO_FRAME_FILTERS:
	raw_arg = oind;
	break;
	case SKIP_UNAVAILABLE:
	skip_unavailable = 1;
	break;
	}
	}

	if (argc - oind != 1 && argc - oind != 3)
	error (_("-stack-list-arguments: Usage: " \
	"[--no-frame-filters] [--skip-unavailable] "
	"PRINT_VALUES [FRAME_LOW FRAME_HIGH]"));

	if (argc - oind == 3)
	{
	frame_low = atoi (argv[1 + oind]);
	frame_high = atoi (argv[2 + oind]);
	}
	else
	{
	/* Called with no arguments, it means we want args for the whole
	backtrace. */
	frame_low = -1;
	frame_high = -1;
	}

	print_values = mi_parse_print_values (argv[oind]);

	/* Let's position fi on the frame at which to start the
	display. Could be the innermost frame if the whole stack needs
	displaying, or if frame_low is 0. */
	for (i = 0, fi = get_current_frame ();
	fi && i < frame_low;
	i++, fi = get_prev_frame (fi));

	if (fi == NULL)
	error (_("-stack-list-arguments: Not enough frames in stack."));

	ui_out_emit_list list_emitter (uiout, "stack-args");

	if (! raw_arg && frame_filters)
	{
	frame_filter_flags flags = PRINT_LEVEL \| PRINT_ARGS;
	int py_frame_low = frame_low;

	/* We cannot pass -1 to frame_low, as that would signify a
	relative backtrace from the tail of the stack. So, in the case
	of frame_low == -1, assign and increment it. */
	if (py_frame_low == -1)
	py_frame_low++;

	result = mi_apply_ext_lang_frame_filter (get_current_frame (), flags,
	print_values, current_uiout,
	py_frame_low, frame_high);
	}

	/* Run the inbuilt backtrace if there are no filters registered, or
	if "--no-frame-filters" has been specified from the command. */
	if (! frame_filters \|\| raw_arg \|\| result == EXT_LANG_BT_NO_FILTERS)
	{
	/* Now let's print the frames up to frame_high, or until there are
	frames in the stack. */
	for (;
	fi && (i <= frame_high \|\| frame_high == -1);
	i++, fi = get_prev_frame (fi))
	{
	QUIT;
	ui_out_emit_tuple tuple_emitter (uiout, "frame");
	uiout->field_signed ("level", i);
	list_args_or_locals (user_frame_print_options,
	arguments, print_values, fi, skip_unavailable);
	}
	}
	}

	/* Print a list of the local variables (including arguments) for the
	current frame. ARGC must be 1 and ARGV[0] specify if only the names,
	or both names and values of the variables must be printed. See
	parse_print_value for possible values. */

	void
	mi_cmd_stack_list_variables (const char command, char *argv, int argc)
	{
	struct frame_info *frame;
	int raw_arg = 0;
	enum ext_lang_bt_status result = EXT_LANG_BT_ERROR;
	enum print_values print_value;
	int oind = 0;
	int skip_unavailable = 0;

	if (argc > 1)
	{
	enum opt
	{
	NO_FRAME_FILTERS,
	SKIP_UNAVAILABLE,
	};
	static const struct mi_opt opts[] =
	{
	{"-no-frame-filters", NO_FRAME_FILTERS, 0},
	{"-skip-unavailable", SKIP_UNAVAILABLE, 0},
	{ 0, 0, 0 }
	};

	while (1)
	{
	char *oarg;
	/* Don't parse 'print-values' as an option. */
	int opt = mi_getopt ("-stack-list-variables", argc - 1,
	argv, opts, &oind, &oarg);
	if (opt < 0)
	break;
	switch ((enum opt) opt)
	{
	case NO_FRAME_FILTERS:
	raw_arg = oind;
	break;
	case SKIP_UNAVAILABLE:
	skip_unavailable = 1;
	break;
	}
	}
	}

	/* After the last option is parsed, there should be only
	'print-values'. */
	if (argc - oind != 1)
	error (_("-stack-list-variables: Usage: [--no-frame-filters] " \
	"[--skip-unavailable] PRINT_VALUES"));

	frame = get_selected_frame (NULL);
	print_value = mi_parse_print_values (argv[oind]);

	if (! raw_arg && frame_filters)
	{
	frame_filter_flags flags = PRINT_LEVEL \| PRINT_ARGS \| PRINT_LOCALS;

	result = mi_apply_ext_lang_frame_filter (frame, flags,
	print_value,
	current_uiout, 0, 0);
	}

	/* Run the inbuilt backtrace if there are no filters registered, or
	if "--no-frame-filters" has been specified from the command. */
	if (! frame_filters \|\| raw_arg \|\| result == EXT_LANG_BT_NO_FILTERS)
	{
	list_args_or_locals (user_frame_print_options,
	all, print_value, frame,
	skip_unavailable);
	}
	}

	/* Print single local or argument. ARG must be already read in. For
	WHAT and VALUES see list_args_or_locals.

	Errors are printed as if they would be the parameter value. Use
	zeroed ARG iff it should not be printed according to VALUES. If
	SKIP_UNAVAILABLE is true, only print ARG if it is available. */

	static void
	list_arg_or_local (const struct frame_arg *arg, enum what_to_list what,
	enum print_values values, int skip_unavailable)
	{
	struct ui_out *uiout = current_uiout;

	gdb_assert (!arg->val \|\| !arg->error);
	gdb_assert ((values == PRINT_NO_VALUES && arg->val == NULL
	&& arg->error == NULL)
	\|\| values == PRINT_SIMPLE_VALUES
	\|\| (values == PRINT_ALL_VALUES
	&& (arg->val != NULL \|\| arg->error != NULL)));
	gdb_assert (arg->entry_kind == print_entry_values_no
	\|\| (arg->entry_kind == print_entry_values_only
	&& (arg->val \|\| arg->error)));

	if (skip_unavailable && arg->val != NULL
	&& (value_entirely_unavailable (arg->val)
	/* A scalar object that does not have all bits available is
	also considered unavailable, because all bits contribute
	to its representation. */
	\|\| (val_print_scalar_type_p (value_type (arg->val))
	&& !value_bytes_available (arg->val,
	value_embedded_offset (arg->val),
	TYPE_LENGTH (value_type (arg->val))))))
	return;

	gdb::optional<ui_out_emit_tuple> tuple_emitter;
	if (values != PRINT_NO_VALUES \|\| what == all)
	tuple_emitter.emplace (uiout, nullptr);

	string_file stb;

	stb.puts (arg->sym->print_name ());
	if (arg->entry_kind == print_entry_values_only)
	stb.puts ("@entry");
	uiout->field_stream ("name", stb);

	if (what == all && SYMBOL_IS_ARGUMENT (arg->sym))
	uiout->field_signed ("arg", 1);

	if (values == PRINT_SIMPLE_VALUES)
	{
	check_typedef (arg->sym->type);
	type_print (arg->sym->type, "", &stb, -1);
	uiout->field_stream ("type", stb);
	}

	if (arg->val \|\| arg->error)
	{
	if (arg->error)
	stb.printf (_("<error reading variable: %s>"), arg->error.get ());
	else
	{
	try
	{
	struct value_print_options opts;

	get_no_prettyformat_print_options (&opts);
	opts.deref_ref = 1;
	common_val_print (arg->val, &stb, 0, &opts,
	language_def (arg->sym->language ()));
	}
	catch (const gdb_exception_error &except)
	{
	stb.printf (_("<error reading variable: %s>"),
	except.what ());
	}
	}
	uiout->field_stream ("value", stb);
	}
	}

	/* Print a list of the objects for the frame FI in a certain form,
	which is determined by VALUES. The objects can be locals,
	arguments or both, which is determined by WHAT. If SKIP_UNAVAILABLE
	is true, only print the arguments or local variables whose values
	are available. */

	static void
	list_args_or_locals (const frame_print_options &fp_opts,
	enum what_to_list what, enum print_values values,
	struct frame_info *fi, int skip_unavailable)
	{
	const struct block *block;
	struct symbol *sym;
	struct block_iterator iter;
	struct type *type;
	const char *name_of_result;
	struct ui_out *uiout = current_uiout;

	block = get_frame_block (fi, 0);

	switch (what)
	{
	case locals:
	name_of_result = "locals";
	break;
	case arguments:
	name_of_result = "args";
	break;
	case all:
	name_of_result = "variables";
	break;
	default:
	internal_error (__FILE__, __LINE__,
	"unexpected what_to_list: %d", (int) what);
	}

	ui_out_emit_list list_emitter (uiout, name_of_result);

	while (block != 0)
	{
	ALL_BLOCK_SYMBOLS (block, iter, sym)
	{
	int print_me = 0;

	switch (SYMBOL_CLASS (sym))
	{
	default:
	case LOC_UNDEF: /* catches errors */
	case LOC_CONST: /* constant */
	case LOC_TYPEDEF: /* local typedef */
	case LOC_LABEL: /* local label */
	case LOC_BLOCK: /* local function */
	case LOC_CONST_BYTES: /* loc. byte seq. */
	case LOC_UNRESOLVED: /* unresolved static */
	case LOC_OPTIMIZED_OUT: /* optimized out */
	print_me = 0;
	break;

	case LOC_ARG: /* argument */
	case LOC_REF_ARG: /* reference arg */
	case LOC_REGPARM_ADDR: /* indirect register arg */
	case LOC_LOCAL: /* stack local */
	case LOC_STATIC: /* static */
	case LOC_REGISTER: /* register */
	case LOC_COMPUTED: /* computed location */
	if (what == all)
	print_me = 1;
	else if (what == locals)
	print_me = !SYMBOL_IS_ARGUMENT (sym);
	else
	print_me = SYMBOL_IS_ARGUMENT (sym);
	break;
	}
	if (print_me)
	{
	struct symbol *sym2;
	struct frame_arg arg, entryarg;

	if (SYMBOL_IS_ARGUMENT (sym))
	sym2 = lookup_symbol_search_name (sym->search_name (),
	block, VAR_DOMAIN).symbol;
	else
	sym2 = sym;
	gdb_assert (sym2 != NULL);

	arg.sym = sym2;
	arg.entry_kind = print_entry_values_no;
	entryarg.sym = sym2;
	entryarg.entry_kind = print_entry_values_no;

	switch (values)
	{
	case PRINT_SIMPLE_VALUES:
	type = check_typedef (sym2->type);
	if (type->code () != TYPE_CODE_ARRAY
	&& type->code () != TYPE_CODE_STRUCT
	&& type->code () != TYPE_CODE_UNION)
	{
	case PRINT_ALL_VALUES:
	if (SYMBOL_IS_ARGUMENT (sym))
	read_frame_arg (fp_opts, sym2, fi, &arg, &entryarg);
	else
	read_frame_local (sym2, fi, &arg);
	}
	break;
	}

	if (arg.entry_kind != print_entry_values_only)
	list_arg_or_local (&arg, what, values, skip_unavailable);
	if (entryarg.entry_kind != print_entry_values_no)
	list_arg_or_local (&entryarg, what, values, skip_unavailable);
	}
	}

	if (BLOCK_FUNCTION (block))
	break;
	else
	block = BLOCK_SUPERBLOCK (block);
	}
	}

	/* Read a frame specification from FRAME_EXP and return the selected frame.
	Call error() if the specification is in any way invalid (so this
	function never returns NULL).

	The frame specification is usually an integer level number, however if
	the number does not match a valid frame level then it will be treated as
	a frame address. The frame address will then be used to find a matching
	frame in the stack. If no matching frame is found then a new frame will
	be created.

	The use of FRAME_EXP as an address is undocumented in the GDB user
	manual, this feature is supported here purely for backward
	compatibility. */

	static struct frame_info *
	parse_frame_specification (const char *frame_exp)
	{
	gdb_assert (frame_exp != NULL);

	/* NOTE: Parse and evaluate expression, but do not use
	functions such as parse_and_eval_long or
	parse_and_eval_address to also extract the value.
	Instead value_as_long and value_as_address are used.
	This avoids problems with expressions that contain
	side-effects. */
	struct value *arg = parse_and_eval (frame_exp);

	/* Assume ARG is an integer, and try using that to select a frame. */
	struct frame_info *fid;
	int level = value_as_long (arg);

	fid = find_relative_frame (get_current_frame (), &level);
	if (level == 0)
	/* find_relative_frame was successful. */
	return fid;

	/* Convert the value into a corresponding address. */
	CORE_ADDR addr = value_as_address (arg);

	/* Assume that ADDR is an address, use that to identify a frame with a
	matching ID. */
	struct frame_id id = frame_id_build_wild (addr);

	/* If (s)he specifies the frame with an address, he deserves
	what (s)he gets. Still, give the highest one that matches.
	(NOTE: cagney/2004-10-29: Why highest, or outer-most, I don't
	know). */
	for (fid = get_current_frame ();
	fid != NULL;
	fid = get_prev_frame (fid))
	{
	if (frame_id_eq (id, get_frame_id (fid)))
	{
	struct frame_info *prev_frame;

	while (1)
	{
	prev_frame = get_prev_frame (fid);
	if (!prev_frame
	\|\| !frame_id_eq (id, get_frame_id (prev_frame)))
	break;
	fid = prev_frame;
	}
	return fid;
	}
	}

	/* We couldn't identify the frame as an existing frame, but
	perhaps we can create one with a single argument. */
	return create_new_frame (addr, 0);
	}

	/* Implement the -stack-select-frame MI command. */

	void
	mi_cmd_stack_select_frame (const char command, char *argv, int argc)
	{
	if (argc == 0 \|\| argc > 1)
	error (_("-stack-select-frame: Usage: FRAME_SPEC"));

	select_frame_for_mi (parse_frame_specification (argv[0]));
	}

	void
	mi_cmd_stack_info_frame (const char command, char *argv, int argc)
	{
	if (argc > 0)
	error (_("-stack-info-frame: No arguments allowed"));

	print_frame_info (user_frame_print_options,
	get_selected_frame (NULL), 1, LOC_AND_ADDRESS, 0, 1);
	}