1319 lines
35 KiB
C
1319 lines
35 KiB
C
/* Print and select stack frames for GDB, the GNU debugger.
|
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Copyright 1986, 1987, 1989, 1991, 1992, 1993 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include "defs.h"
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#include "value.h"
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#include "symtab.h"
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#include "gdbtypes.h"
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#include "expression.h"
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#include "language.h"
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#include "frame.h"
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#include "gdbcmd.h"
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#include "gdbcore.h"
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#include "target.h"
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#include "breakpoint.h"
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#include "demangle.h"
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#include "inferior.h"
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static void
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return_command PARAMS ((char *, int));
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static void
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down_command PARAMS ((char *, int));
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static void
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down_silently_command PARAMS ((char *, int));
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static void
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up_command PARAMS ((char *, int));
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static void
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up_silently_command PARAMS ((char *, int));
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static void
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frame_command PARAMS ((char *, int));
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static void
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select_frame_command PARAMS ((char *, int));
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static void
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args_info PARAMS ((char *, int));
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static void
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print_frame_arg_vars PARAMS ((FRAME, FILE *));
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static void
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catch_info PARAMS ((char *, int));
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static void
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locals_info PARAMS ((char *, int));
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static void
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print_frame_label_vars PARAMS ((FRAME, int, FILE *));
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static void
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print_frame_local_vars PARAMS ((FRAME, FILE *));
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static int
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print_block_frame_labels PARAMS ((struct block *, int *, FILE *));
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static int
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print_block_frame_locals PARAMS ((struct block *, FRAME, FILE *));
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static void
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backtrace_command PARAMS ((char *, int));
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static FRAME
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parse_frame_specification PARAMS ((char *));
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static void
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frame_info PARAMS ((char *, int));
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extern int addressprint; /* Print addresses, or stay symbolic only? */
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extern int info_verbose; /* Verbosity of symbol reading msgs */
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extern int lines_to_list; /* # of lines "list" command shows by default */
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/* The "selected" stack frame is used by default for local and arg access.
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May be zero, for no selected frame. */
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FRAME selected_frame;
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/* Level of the selected frame:
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0 for innermost, 1 for its caller, ...
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or -1 for frame specified by address with no defined level. */
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int selected_frame_level;
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/* Nonzero means print the full filename and linenumber
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when a frame is printed, and do so in a format programs can parse. */
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int frame_file_full_name = 0;
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/* Print a stack frame briefly. FRAME should be the frame id
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and LEVEL should be its level in the stack (or -1 for level not defined).
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This prints the level, the function executing, the arguments,
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and the file name and line number.
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If the pc is not at the beginning of the source line,
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the actual pc is printed at the beginning.
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If SOURCE is 1, print the source line as well.
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If SOURCE is -1, print ONLY the source line. */
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void
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print_stack_frame (frame, level, source)
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FRAME frame;
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int level;
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int source;
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{
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struct frame_info *fi;
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fi = get_frame_info (frame);
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print_frame_info (fi, level, source, 1);
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}
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struct print_args_args {
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struct symbol *func;
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struct frame_info *fi;
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};
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static int print_args_stub PARAMS ((char *));
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/* Pass the args the way catch_errors wants them. */
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static int
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print_args_stub (args)
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char *args;
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{
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int numargs;
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struct print_args_args *p = (struct print_args_args *)args;
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FRAME_NUM_ARGS (numargs, (p->fi));
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print_frame_args (p->func, p->fi, numargs, stdout);
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return 0;
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}
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void
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print_frame_info (fi, level, source, args)
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struct frame_info *fi;
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register int level;
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int source;
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int args;
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{
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struct symtab_and_line sal;
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struct symbol *func;
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register char *funname = 0;
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enum language funlang = language_unknown;
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int numargs;
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if (PC_IN_CALL_DUMMY (fi->pc, read_register (SP_REGNUM), fi->frame))
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{
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/* Do this regardless of SOURCE because we don't have any source
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to list for this frame. */
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if (level >= 0)
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printf_filtered ("#%-2d ", level);
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printf_filtered ("<function called from gdb>\n");
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return;
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}
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if (fi->signal_handler_caller)
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{
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/* Do this regardless of SOURCE because we don't have any source
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to list for this frame. */
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if (level >= 0)
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printf_filtered ("#%-2d ", level);
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printf_filtered ("<signal handler called>\n");
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return;
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}
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sal = find_pc_line (fi->pc, fi->next_frame);
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func = find_pc_function (fi->pc);
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if (func)
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{
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/* In certain pathological cases, the symtabs give the wrong
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function (when we are in the first function in a file which
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is compiled without debugging symbols, the previous function
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is compiled with debugging symbols, and the "foo.o" symbol
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that is supposed to tell us where the file with debugging symbols
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ends has been truncated by ar because it is longer than 15
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characters).
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So look in the minimal symbol tables as well, and if it comes
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up with a larger address for the function use that instead.
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I don't think this can ever cause any problems; there shouldn't
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be any minimal symbols in the middle of a function.
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FIXME: (Not necessarily true. What about text labels) */
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struct minimal_symbol *msymbol = lookup_minimal_symbol_by_pc (fi->pc);
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if (msymbol != NULL
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&& (SYMBOL_VALUE_ADDRESS (msymbol)
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> BLOCK_START (SYMBOL_BLOCK_VALUE (func))))
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{
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/* In this case we have no way of knowing the source file
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and line number, so don't print them. */
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sal.symtab = 0;
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/* We also don't know anything about the function besides
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its address and name. */
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func = 0;
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funname = SYMBOL_NAME (msymbol);
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funlang = SYMBOL_LANGUAGE (msymbol);
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}
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else
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{
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funname = SYMBOL_NAME (func);
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funlang = SYMBOL_LANGUAGE (func);
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}
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}
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else
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{
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register struct minimal_symbol *msymbol = lookup_minimal_symbol_by_pc (fi->pc);
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if (msymbol != NULL)
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{
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funname = SYMBOL_NAME (msymbol);
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funlang = SYMBOL_LANGUAGE (msymbol);
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}
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}
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if (source >= 0 || !sal.symtab)
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{
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if (level >= 0)
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printf_filtered ("#%-2d ", level);
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if (addressprint)
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if (fi->pc != sal.pc || !sal.symtab)
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printf_filtered ("%s in ", local_hex_string(fi->pc));
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fprintf_symbol_filtered (stdout, funname ? funname : "??", funlang,
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DMGL_NO_OPTS);
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wrap_here (" ");
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fputs_filtered (" (", stdout);
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if (args)
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{
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struct print_args_args args;
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args.fi = fi;
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args.func = func;
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catch_errors (print_args_stub, (char *)&args, "");
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}
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printf_filtered (")");
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if (sal.symtab && sal.symtab->filename)
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{
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wrap_here (" ");
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printf_filtered (" at %s:%d", sal.symtab->filename, sal.line);
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}
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#ifdef PC_LOAD_SEGMENT
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/* If we couldn't print out function name but if can figure out what
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load segment this pc value is from, at least print out some info
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about its load segment. */
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if (!funname) {
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wrap_here (" ");
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printf_filtered (" from %s", PC_LOAD_SEGMENT (fi->pc));
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}
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#endif
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printf_filtered ("\n");
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}
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if ((source != 0) && sal.symtab)
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{
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int done = 0;
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int mid_statement = source < 0 && fi->pc != sal.pc;
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if (frame_file_full_name)
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done = identify_source_line (sal.symtab, sal.line, mid_statement,
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fi->pc);
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if (!done)
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{
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if (addressprint && mid_statement)
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printf_filtered ("%s\t", local_hex_string(fi->pc));
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print_source_lines (sal.symtab, sal.line, sal.line + 1, 0);
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}
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current_source_line = max (sal.line - lines_to_list/2, 1);
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}
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if (source != 0)
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set_default_breakpoint (1, fi->pc, sal.symtab, sal.line);
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fflush (stdout);
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}
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/*
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* Read a frame specification in whatever the appropriate format is.
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* Call error() if the specification is in any way invalid (i.e.
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* this function never returns NULL).
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*/
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static FRAME
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parse_frame_specification (frame_exp)
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char *frame_exp;
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{
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int numargs = 0;
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int arg1, arg2, arg3;
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#define MAXARGS 4
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int args[MAXARGS];
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if (frame_exp)
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{
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char *addr_string, *p;
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struct cleanup *tmp_cleanup;
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while (*frame_exp == ' ') frame_exp++;
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while (*frame_exp)
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{
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if (numargs > MAXARGS)
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error ("Too many args in frame specification");
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/* Parse an argument. */
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for (p = frame_exp; *p && *p != ' '; p++)
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;
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addr_string = savestring(frame_exp, p - frame_exp);
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{
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tmp_cleanup = make_cleanup (free, addr_string);
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args[numargs++] = parse_and_eval_address (addr_string);
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do_cleanups (tmp_cleanup);
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}
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/* Skip spaces, move to possible next arg. */
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while (*p == ' ') p++;
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frame_exp = p;
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}
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}
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switch (numargs)
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{
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case 0:
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if (selected_frame == NULL)
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error ("No selected frame.");
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return selected_frame;
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/* NOTREACHED */
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case 1:
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{
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int level = args[0];
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FRAME fid = find_relative_frame (get_current_frame (), &level);
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FRAME tfid;
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if (level == 0)
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/* find_relative_frame was successful */
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return fid;
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/* If (s)he specifies the frame with an address, he deserves what
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(s)he gets. Still, give the highest one that matches. */
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for (fid = get_current_frame ();
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fid && FRAME_FP (fid) != args[0];
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fid = get_prev_frame (fid))
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||
;
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||
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if (fid)
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while ((tfid = get_prev_frame (fid)) &&
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(FRAME_FP (tfid) == args[0]))
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fid = tfid;
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/* We couldn't identify the frame as an existing frame, but
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perhaps we can create one with a single argument.
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Fall through to default case; it's up to SETUP_ARBITRARY_FRAME
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||
to complain if it doesn't like a single arg. */
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||
}
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||
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default:
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#ifdef SETUP_ARBITRARY_FRAME
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return SETUP_ARBITRARY_FRAME (numargs, args);
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#else
|
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/* Usual case. Do it here rather than have everyone supply
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a SETUP_ARBITRARY_FRAME that does this. */
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if (numargs == 1)
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return create_new_frame (args[0], 0);
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||
error ("Too many args in frame specification");
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||
#endif
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/* NOTREACHED */
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||
}
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/* NOTREACHED */
|
||
}
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||
|
||
/* FRAME_ARGS_ADDRESS_CORRECT is just like FRAME_ARGS_ADDRESS except
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||
that if it is unsure about the answer, it returns 0
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||
instead of guessing (this happens on the VAX and i960, for example).
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||
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On most machines, we never have to guess about the args address,
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so FRAME_ARGS_ADDRESS{,_CORRECT} are the same. */
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||
#if !defined (FRAME_ARGS_ADDRESS_CORRECT)
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#define FRAME_ARGS_ADDRESS_CORRECT FRAME_ARGS_ADDRESS
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#endif
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||
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||
/* Print verbosely the selected frame or the frame at address ADDR.
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||
This means absolutely all information in the frame is printed. */
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||
|
||
static void
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||
frame_info (addr_exp, from_tty)
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||
char *addr_exp;
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||
int from_tty;
|
||
{
|
||
FRAME frame;
|
||
struct frame_info *fi;
|
||
struct frame_saved_regs fsr;
|
||
struct symtab_and_line sal;
|
||
struct symbol *func;
|
||
struct symtab *s;
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||
FRAME calling_frame;
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||
int i, count;
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||
char *funname = 0;
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||
enum language funlang = language_unknown;
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||
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if (!target_has_stack)
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error ("No stack.");
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||
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||
frame = parse_frame_specification (addr_exp);
|
||
if (!frame)
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||
error ("Invalid frame specified.");
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||
|
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fi = get_frame_info (frame);
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sal = find_pc_line (fi->pc, fi->next_frame);
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||
func = get_frame_function (frame);
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||
s = find_pc_symtab(fi->pc);
|
||
if (func)
|
||
{
|
||
funname = SYMBOL_NAME (func);
|
||
funlang = SYMBOL_LANGUAGE (func);
|
||
}
|
||
else
|
||
{
|
||
register struct minimal_symbol *msymbol = lookup_minimal_symbol_by_pc (fi->pc);
|
||
if (msymbol != NULL)
|
||
{
|
||
funname = SYMBOL_NAME (msymbol);
|
||
funlang = SYMBOL_LANGUAGE (msymbol);
|
||
}
|
||
}
|
||
calling_frame = get_prev_frame (frame);
|
||
|
||
if (!addr_exp && selected_frame_level >= 0) {
|
||
printf_filtered ("Stack level %d, frame at %s:\n",
|
||
selected_frame_level,
|
||
local_hex_string(FRAME_FP(frame)));
|
||
} else {
|
||
printf_filtered ("Stack frame at %s:\n",
|
||
local_hex_string(FRAME_FP(frame)));
|
||
}
|
||
printf_filtered (" %s = %s",
|
||
reg_names[PC_REGNUM],
|
||
local_hex_string(fi->pc));
|
||
|
||
wrap_here (" ");
|
||
if (funname)
|
||
{
|
||
printf_filtered (" in ");
|
||
fprintf_symbol_filtered (stdout, funname, funlang,
|
||
DMGL_ANSI | DMGL_PARAMS);
|
||
}
|
||
wrap_here (" ");
|
||
if (sal.symtab)
|
||
printf_filtered (" (%s:%d)", sal.symtab->filename, sal.line);
|
||
puts_filtered ("; ");
|
||
wrap_here (" ");
|
||
printf_filtered ("saved %s %s\n", reg_names[PC_REGNUM],
|
||
local_hex_string(FRAME_SAVED_PC (frame)));
|
||
|
||
{
|
||
int frameless = 0;
|
||
#ifdef FRAMELESS_FUNCTION_INVOCATION
|
||
FRAMELESS_FUNCTION_INVOCATION (fi, frameless);
|
||
#endif
|
||
if (frameless)
|
||
printf_filtered (" (FRAMELESS),");
|
||
}
|
||
|
||
if (calling_frame)
|
||
printf_filtered (" called by frame at %s",
|
||
local_hex_string(FRAME_FP (calling_frame)));
|
||
if (fi->next_frame && calling_frame)
|
||
puts_filtered (",");
|
||
wrap_here (" ");
|
||
if (fi->next_frame)
|
||
printf_filtered (" caller of frame at %s", local_hex_string(fi->next_frame));
|
||
if (fi->next_frame || calling_frame)
|
||
puts_filtered ("\n");
|
||
if (s)
|
||
printf_filtered(" source language %s.\n", language_str(s->language));
|
||
|
||
#ifdef PRINT_EXTRA_FRAME_INFO
|
||
PRINT_EXTRA_FRAME_INFO (fi);
|
||
#endif
|
||
|
||
{
|
||
/* Address of the argument list for this frame, or 0. */
|
||
CORE_ADDR arg_list = FRAME_ARGS_ADDRESS_CORRECT (fi);
|
||
/* Number of args for this frame, or -1 if unknown. */
|
||
int numargs;
|
||
|
||
if (arg_list == 0)
|
||
printf_filtered (" Arglist at unknown address.\n");
|
||
else
|
||
{
|
||
printf_filtered (" Arglist at %s,", local_hex_string(arg_list));
|
||
|
||
FRAME_NUM_ARGS (numargs, fi);
|
||
if (numargs < 0)
|
||
puts_filtered (" args: ");
|
||
else if (numargs == 0)
|
||
puts_filtered (" no args.");
|
||
else if (numargs == 1)
|
||
puts_filtered (" 1 arg: ");
|
||
else
|
||
printf_filtered (" %d args: ", numargs);
|
||
print_frame_args (func, fi, numargs, stdout);
|
||
puts_filtered ("\n");
|
||
}
|
||
}
|
||
{
|
||
/* Address of the local variables for this frame, or 0. */
|
||
CORE_ADDR arg_list = FRAME_LOCALS_ADDRESS (fi);
|
||
|
||
if (arg_list == 0)
|
||
printf_filtered (" Locals at unknown address,");
|
||
else
|
||
printf_filtered (" Locals at %s,", local_hex_string(arg_list));
|
||
}
|
||
|
||
#if defined (FRAME_FIND_SAVED_REGS)
|
||
get_frame_saved_regs (fi, &fsr);
|
||
/* The sp is special; what's returned isn't the save address, but
|
||
actually the value of the previous frame's sp. */
|
||
printf_filtered (" Previous frame's sp is %s\n",
|
||
local_hex_string(fsr.regs[SP_REGNUM]));
|
||
count = 0;
|
||
for (i = 0; i < NUM_REGS; i++)
|
||
if (fsr.regs[i] && i != SP_REGNUM)
|
||
{
|
||
if (count == 0)
|
||
puts_filtered (" Saved registers:\n ");
|
||
else
|
||
puts_filtered (",");
|
||
wrap_here (" ");
|
||
printf_filtered (" %s at %s", reg_names[i],
|
||
local_hex_string(fsr.regs[i]));
|
||
count++;
|
||
}
|
||
if (count)
|
||
puts_filtered ("\n");
|
||
#endif /* Have FRAME_FIND_SAVED_REGS. */
|
||
}
|
||
|
||
#if 0
|
||
/* Set a limit on the number of frames printed by default in a
|
||
backtrace. */
|
||
|
||
static int backtrace_limit;
|
||
|
||
static void
|
||
set_backtrace_limit_command (count_exp, from_tty)
|
||
char *count_exp;
|
||
int from_tty;
|
||
{
|
||
int count = parse_and_eval_address (count_exp);
|
||
|
||
if (count < 0)
|
||
error ("Negative argument not meaningful as backtrace limit.");
|
||
|
||
backtrace_limit = count;
|
||
}
|
||
|
||
static void
|
||
backtrace_limit_info (arg, from_tty)
|
||
char *arg;
|
||
int from_tty;
|
||
{
|
||
if (arg)
|
||
error ("\"Info backtrace-limit\" takes no arguments.");
|
||
|
||
printf ("Backtrace limit: %d.\n", backtrace_limit);
|
||
}
|
||
#endif
|
||
|
||
/* Print briefly all stack frames or just the innermost COUNT frames. */
|
||
|
||
static void
|
||
backtrace_command (count_exp, from_tty)
|
||
char *count_exp;
|
||
int from_tty;
|
||
{
|
||
struct frame_info *fi;
|
||
register int count;
|
||
register FRAME frame;
|
||
register int i;
|
||
register FRAME trailing;
|
||
register int trailing_level;
|
||
|
||
if (!target_has_stack)
|
||
error ("No stack.");
|
||
|
||
/* The following code must do two things. First, it must
|
||
set the variable TRAILING to the frame from which we should start
|
||
printing. Second, it must set the variable count to the number
|
||
of frames which we should print, or -1 if all of them. */
|
||
trailing = get_current_frame ();
|
||
trailing_level = 0;
|
||
if (count_exp)
|
||
{
|
||
count = parse_and_eval_address (count_exp);
|
||
if (count < 0)
|
||
{
|
||
FRAME current;
|
||
|
||
count = -count;
|
||
|
||
current = trailing;
|
||
while (current && count--)
|
||
{
|
||
QUIT;
|
||
current = get_prev_frame (current);
|
||
}
|
||
|
||
/* Will stop when CURRENT reaches the top of the stack. TRAILING
|
||
will be COUNT below it. */
|
||
while (current)
|
||
{
|
||
QUIT;
|
||
trailing = get_prev_frame (trailing);
|
||
current = get_prev_frame (current);
|
||
trailing_level++;
|
||
}
|
||
|
||
count = -1;
|
||
}
|
||
}
|
||
else
|
||
count = -1;
|
||
|
||
if (info_verbose)
|
||
{
|
||
struct partial_symtab *ps;
|
||
|
||
/* Read in symbols for all of the frames. Need to do this in
|
||
a separate pass so that "Reading in symbols for xxx" messages
|
||
don't screw up the appearance of the backtrace. Also
|
||
if people have strong opinions against reading symbols for
|
||
backtrace this may have to be an option. */
|
||
i = count;
|
||
for (frame = trailing;
|
||
frame != NULL && i--;
|
||
frame = get_prev_frame (frame))
|
||
{
|
||
QUIT;
|
||
fi = get_frame_info (frame);
|
||
ps = find_pc_psymtab (fi->pc);
|
||
if (ps)
|
||
PSYMTAB_TO_SYMTAB (ps); /* Force syms to come in */
|
||
}
|
||
}
|
||
|
||
for (i = 0, frame = trailing;
|
||
frame && count--;
|
||
i++, frame = get_prev_frame (frame))
|
||
{
|
||
QUIT;
|
||
fi = get_frame_info (frame);
|
||
print_frame_info (fi, trailing_level + i, 0, 1);
|
||
}
|
||
|
||
/* If we've stopped before the end, mention that. */
|
||
if (frame && from_tty)
|
||
printf_filtered ("(More stack frames follow...)\n");
|
||
}
|
||
|
||
/* Print the local variables of a block B active in FRAME.
|
||
Return 1 if any variables were printed; 0 otherwise. */
|
||
|
||
static int
|
||
print_block_frame_locals (b, frame, stream)
|
||
struct block *b;
|
||
register FRAME frame;
|
||
register FILE *stream;
|
||
{
|
||
int nsyms;
|
||
register int i;
|
||
register struct symbol *sym;
|
||
register int values_printed = 0;
|
||
|
||
nsyms = BLOCK_NSYMS (b);
|
||
|
||
for (i = 0; i < nsyms; i++)
|
||
{
|
||
sym = BLOCK_SYM (b, i);
|
||
if (SYMBOL_CLASS (sym) == LOC_LOCAL
|
||
|| SYMBOL_CLASS (sym) == LOC_REGISTER
|
||
|| SYMBOL_CLASS (sym) == LOC_STATIC)
|
||
{
|
||
values_printed = 1;
|
||
fputs_filtered (SYMBOL_SOURCE_NAME (sym), stream);
|
||
fputs_filtered (" = ", stream);
|
||
print_variable_value (sym, frame, stream);
|
||
fprintf_filtered (stream, "\n");
|
||
}
|
||
}
|
||
return values_printed;
|
||
}
|
||
|
||
/* Same, but print labels. */
|
||
|
||
static int
|
||
print_block_frame_labels (b, have_default, stream)
|
||
struct block *b;
|
||
int *have_default;
|
||
register FILE *stream;
|
||
{
|
||
int nsyms;
|
||
register int i;
|
||
register struct symbol *sym;
|
||
register int values_printed = 0;
|
||
|
||
nsyms = BLOCK_NSYMS (b);
|
||
|
||
for (i = 0; i < nsyms; i++)
|
||
{
|
||
sym = BLOCK_SYM (b, i);
|
||
if (STREQ (SYMBOL_NAME (sym), "default"))
|
||
{
|
||
if (*have_default)
|
||
continue;
|
||
*have_default = 1;
|
||
}
|
||
if (SYMBOL_CLASS (sym) == LOC_LABEL)
|
||
{
|
||
struct symtab_and_line sal;
|
||
sal = find_pc_line (SYMBOL_VALUE_ADDRESS (sym), 0);
|
||
values_printed = 1;
|
||
fputs_filtered (SYMBOL_SOURCE_NAME (sym), stream);
|
||
if (addressprint)
|
||
fprintf_filtered (stream, " %s",
|
||
local_hex_string(SYMBOL_VALUE_ADDRESS (sym)));
|
||
fprintf_filtered (stream, " in file %s, line %d\n",
|
||
sal.symtab->filename, sal.line);
|
||
}
|
||
}
|
||
return values_printed;
|
||
}
|
||
|
||
/* Print on STREAM all the local variables in frame FRAME,
|
||
including all the blocks active in that frame
|
||
at its current pc.
|
||
|
||
Returns 1 if the job was done,
|
||
or 0 if nothing was printed because we have no info
|
||
on the function running in FRAME. */
|
||
|
||
static void
|
||
print_frame_local_vars (frame, stream)
|
||
register FRAME frame;
|
||
register FILE *stream;
|
||
{
|
||
register struct block *block = get_frame_block (frame);
|
||
register int values_printed = 0;
|
||
|
||
if (block == 0)
|
||
{
|
||
fprintf_filtered (stream, "No symbol table info available.\n");
|
||
return;
|
||
}
|
||
|
||
while (block != 0)
|
||
{
|
||
if (print_block_frame_locals (block, frame, stream))
|
||
values_printed = 1;
|
||
/* After handling the function's top-level block, stop.
|
||
Don't continue to its superblock, the block of
|
||
per-file symbols. */
|
||
if (BLOCK_FUNCTION (block))
|
||
break;
|
||
block = BLOCK_SUPERBLOCK (block);
|
||
}
|
||
|
||
if (!values_printed)
|
||
{
|
||
fprintf_filtered (stream, "No locals.\n");
|
||
}
|
||
}
|
||
|
||
/* Same, but print labels. */
|
||
|
||
static void
|
||
print_frame_label_vars (frame, this_level_only, stream)
|
||
register FRAME frame;
|
||
int this_level_only;
|
||
register FILE *stream;
|
||
{
|
||
register struct blockvector *bl;
|
||
register struct block *block = get_frame_block (frame);
|
||
register int values_printed = 0;
|
||
int index, have_default = 0;
|
||
char *blocks_printed;
|
||
struct frame_info *fi = get_frame_info (frame);
|
||
CORE_ADDR pc = fi->pc;
|
||
|
||
if (block == 0)
|
||
{
|
||
fprintf_filtered (stream, "No symbol table info available.\n");
|
||
return;
|
||
}
|
||
|
||
bl = blockvector_for_pc (BLOCK_END (block) - 4, &index);
|
||
blocks_printed = (char *) alloca (BLOCKVECTOR_NBLOCKS (bl) * sizeof (char));
|
||
memset (blocks_printed, 0, BLOCKVECTOR_NBLOCKS (bl) * sizeof (char));
|
||
|
||
while (block != 0)
|
||
{
|
||
CORE_ADDR end = BLOCK_END (block) - 4;
|
||
int last_index;
|
||
|
||
if (bl != blockvector_for_pc (end, &index))
|
||
error ("blockvector blotch");
|
||
if (BLOCKVECTOR_BLOCK (bl, index) != block)
|
||
error ("blockvector botch");
|
||
last_index = BLOCKVECTOR_NBLOCKS (bl);
|
||
index += 1;
|
||
|
||
/* Don't print out blocks that have gone by. */
|
||
while (index < last_index
|
||
&& BLOCK_END (BLOCKVECTOR_BLOCK (bl, index)) < pc)
|
||
index++;
|
||
|
||
while (index < last_index
|
||
&& BLOCK_END (BLOCKVECTOR_BLOCK (bl, index)) < end)
|
||
{
|
||
if (blocks_printed[index] == 0)
|
||
{
|
||
if (print_block_frame_labels (BLOCKVECTOR_BLOCK (bl, index), &have_default, stream))
|
||
values_printed = 1;
|
||
blocks_printed[index] = 1;
|
||
}
|
||
index++;
|
||
}
|
||
if (have_default)
|
||
return;
|
||
if (values_printed && this_level_only)
|
||
return;
|
||
|
||
/* After handling the function's top-level block, stop.
|
||
Don't continue to its superblock, the block of
|
||
per-file symbols. */
|
||
if (BLOCK_FUNCTION (block))
|
||
break;
|
||
block = BLOCK_SUPERBLOCK (block);
|
||
}
|
||
|
||
if (!values_printed && !this_level_only)
|
||
{
|
||
fprintf_filtered (stream, "No catches.\n");
|
||
}
|
||
}
|
||
|
||
/* ARGSUSED */
|
||
static void
|
||
locals_info (args, from_tty)
|
||
char *args;
|
||
int from_tty;
|
||
{
|
||
if (!selected_frame)
|
||
error ("No frame selected.");
|
||
print_frame_local_vars (selected_frame, stdout);
|
||
}
|
||
|
||
static void
|
||
catch_info (ignore, from_tty)
|
||
char *ignore;
|
||
int from_tty;
|
||
{
|
||
if (!selected_frame)
|
||
error ("No frame selected.");
|
||
print_frame_label_vars (selected_frame, 0, stdout);
|
||
}
|
||
|
||
static void
|
||
print_frame_arg_vars (frame, stream)
|
||
register FRAME frame;
|
||
register FILE *stream;
|
||
{
|
||
struct symbol *func = get_frame_function (frame);
|
||
register struct block *b;
|
||
int nsyms;
|
||
register int i;
|
||
register struct symbol *sym, *sym2;
|
||
register int values_printed = 0;
|
||
|
||
if (func == 0)
|
||
{
|
||
fprintf_filtered (stream, "No symbol table info available.\n");
|
||
return;
|
||
}
|
||
|
||
b = SYMBOL_BLOCK_VALUE (func);
|
||
nsyms = BLOCK_NSYMS (b);
|
||
|
||
for (i = 0; i < nsyms; i++)
|
||
{
|
||
sym = BLOCK_SYM (b, i);
|
||
if (SYMBOL_CLASS (sym) == LOC_ARG
|
||
|| SYMBOL_CLASS (sym) == LOC_LOCAL_ARG
|
||
|| SYMBOL_CLASS (sym) == LOC_REF_ARG
|
||
|| SYMBOL_CLASS (sym) == LOC_REGPARM
|
||
|| SYMBOL_CLASS (sym) == LOC_REGPARM_ADDR)
|
||
{
|
||
values_printed = 1;
|
||
fputs_filtered (SYMBOL_SOURCE_NAME (sym), stream);
|
||
fputs_filtered (" = ", stream);
|
||
|
||
/* We have to look up the symbol because arguments can have
|
||
two entries (one a parameter, one a local) and the one we
|
||
want is the local, which lookup_symbol will find for us.
|
||
This includes gcc1 (not gcc2) on the sparc when passing a
|
||
small structure and gcc2 when the argument type is float
|
||
and it is passed as a double and converted to float by
|
||
the prologue (in the latter case the type of the LOC_ARG
|
||
symbol is double and the type of the LOC_LOCAL symbol is
|
||
float). There are also LOC_ARG/LOC_REGISTER pairs which
|
||
are not combined in symbol-reading. */
|
||
|
||
sym2 = lookup_symbol (SYMBOL_NAME (sym),
|
||
b, VAR_NAMESPACE, (int *)NULL, (struct symtab **)NULL);
|
||
print_variable_value (sym2, frame, stream);
|
||
fprintf_filtered (stream, "\n");
|
||
}
|
||
}
|
||
|
||
if (!values_printed)
|
||
{
|
||
fprintf_filtered (stream, "No arguments.\n");
|
||
}
|
||
}
|
||
|
||
static void
|
||
args_info (ignore, from_tty)
|
||
char *ignore;
|
||
int from_tty;
|
||
{
|
||
if (!selected_frame)
|
||
error ("No frame selected.");
|
||
print_frame_arg_vars (selected_frame, stdout);
|
||
}
|
||
|
||
/* Select frame FRAME, and note that its stack level is LEVEL.
|
||
LEVEL may be -1 if an actual level number is not known. */
|
||
|
||
void
|
||
select_frame (frame, level)
|
||
FRAME frame;
|
||
int level;
|
||
{
|
||
register struct symtab *s;
|
||
|
||
selected_frame = frame;
|
||
selected_frame_level = level;
|
||
|
||
/* Ensure that symbols for this frame are read in. Also, determine the
|
||
source language of this frame, and switch to it if desired. */
|
||
if (frame)
|
||
{
|
||
s = find_pc_symtab (get_frame_info (frame)->pc);
|
||
if (s
|
||
&& s->language != current_language->la_language
|
||
&& s->language != language_unknown
|
||
&& language_mode == language_mode_auto) {
|
||
set_language(s->language);
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Store the selected frame and its level into *FRAMEP and *LEVELP.
|
||
If there is no selected frame, *FRAMEP is set to NULL. */
|
||
|
||
void
|
||
record_selected_frame (frameaddrp, levelp)
|
||
FRAME_ADDR *frameaddrp;
|
||
int *levelp;
|
||
{
|
||
*frameaddrp = selected_frame ? FRAME_FP (selected_frame) : 0;
|
||
*levelp = selected_frame_level;
|
||
}
|
||
|
||
/* Return the symbol-block in which the selected frame is executing.
|
||
Can return zero under various legitimate circumstances. */
|
||
|
||
struct block *
|
||
get_selected_block ()
|
||
{
|
||
if (!target_has_stack)
|
||
return 0;
|
||
|
||
if (!selected_frame)
|
||
return get_current_block ();
|
||
return get_frame_block (selected_frame);
|
||
}
|
||
|
||
/* Find a frame a certain number of levels away from FRAME.
|
||
LEVEL_OFFSET_PTR points to an int containing the number of levels.
|
||
Positive means go to earlier frames (up); negative, the reverse.
|
||
The int that contains the number of levels is counted toward
|
||
zero as the frames for those levels are found.
|
||
If the top or bottom frame is reached, that frame is returned,
|
||
but the final value of *LEVEL_OFFSET_PTR is nonzero and indicates
|
||
how much farther the original request asked to go. */
|
||
|
||
FRAME
|
||
find_relative_frame (frame, level_offset_ptr)
|
||
register FRAME frame;
|
||
register int* level_offset_ptr;
|
||
{
|
||
register FRAME prev;
|
||
register FRAME frame1;
|
||
|
||
/* Going up is simple: just do get_prev_frame enough times
|
||
or until initial frame is reached. */
|
||
while (*level_offset_ptr > 0)
|
||
{
|
||
prev = get_prev_frame (frame);
|
||
if (prev == 0)
|
||
break;
|
||
(*level_offset_ptr)--;
|
||
frame = prev;
|
||
}
|
||
/* Going down is just as simple. */
|
||
if (*level_offset_ptr < 0)
|
||
{
|
||
while (*level_offset_ptr < 0) {
|
||
frame1 = get_next_frame (frame);
|
||
if (!frame1)
|
||
break;
|
||
frame = frame1;
|
||
(*level_offset_ptr)++;
|
||
}
|
||
}
|
||
return frame;
|
||
}
|
||
|
||
/* The "select_frame" command. With no arg, NOP.
|
||
With arg LEVEL_EXP, select the frame at level LEVEL if it is a
|
||
valid level. Otherwise, treat level_exp as an address expression
|
||
and select it. See parse_frame_specification for more info on proper
|
||
frame expressions. */
|
||
|
||
/* ARGSUSED */
|
||
static void
|
||
select_frame_command (level_exp, from_tty)
|
||
char *level_exp;
|
||
int from_tty;
|
||
{
|
||
register FRAME frame, frame1;
|
||
unsigned int level = 0;
|
||
|
||
if (!target_has_stack)
|
||
error ("No stack.");
|
||
|
||
frame = parse_frame_specification (level_exp);
|
||
|
||
/* Try to figure out what level this frame is. But if there is
|
||
no current stack, don't error out -- let the user set one. */
|
||
frame1 = 0;
|
||
if (get_current_frame()) {
|
||
for (frame1 = get_prev_frame (0);
|
||
frame1 && frame1 != frame;
|
||
frame1 = get_prev_frame (frame1))
|
||
level++;
|
||
}
|
||
|
||
if (!frame1)
|
||
level = 0;
|
||
|
||
select_frame (frame, level);
|
||
}
|
||
|
||
/* The "frame" command. With no arg, print selected frame briefly.
|
||
With arg, behaves like select_frame and then prints the selected
|
||
frame. */
|
||
|
||
static void
|
||
frame_command (level_exp, from_tty)
|
||
char *level_exp;
|
||
int from_tty;
|
||
{
|
||
select_frame_command (level_exp, from_tty);
|
||
print_stack_frame (selected_frame, selected_frame_level, 1);
|
||
}
|
||
|
||
/* Select the frame up one or COUNT stack levels
|
||
from the previously selected frame, and print it briefly. */
|
||
|
||
/* ARGSUSED */
|
||
static void
|
||
up_silently_command (count_exp, from_tty)
|
||
char *count_exp;
|
||
int from_tty;
|
||
{
|
||
register FRAME frame;
|
||
int count = 1, count1;
|
||
if (count_exp)
|
||
count = parse_and_eval_address (count_exp);
|
||
count1 = count;
|
||
|
||
if (target_has_stack == 0 || selected_frame == 0)
|
||
error ("No stack.");
|
||
|
||
frame = find_relative_frame (selected_frame, &count1);
|
||
if (count1 != 0 && count_exp == 0)
|
||
error ("Initial frame selected; you cannot go up.");
|
||
select_frame (frame, selected_frame_level + count - count1);
|
||
}
|
||
|
||
static void
|
||
up_command (count_exp, from_tty)
|
||
char *count_exp;
|
||
int from_tty;
|
||
{
|
||
up_silently_command (count_exp, from_tty);
|
||
print_stack_frame (selected_frame, selected_frame_level, 1);
|
||
}
|
||
|
||
/* Select the frame down one or COUNT stack levels
|
||
from the previously selected frame, and print it briefly. */
|
||
|
||
/* ARGSUSED */
|
||
static void
|
||
down_silently_command (count_exp, from_tty)
|
||
char *count_exp;
|
||
int from_tty;
|
||
{
|
||
register FRAME frame;
|
||
int count = -1, count1;
|
||
if (count_exp)
|
||
count = - parse_and_eval_address (count_exp);
|
||
count1 = count;
|
||
|
||
if (target_has_stack == 0 || selected_frame == 0)
|
||
error ("No stack.");
|
||
|
||
frame = find_relative_frame (selected_frame, &count1);
|
||
if (count1 != 0 && count_exp == 0)
|
||
error ("Bottom (i.e., innermost) frame selected; you cannot go down.");
|
||
select_frame (frame, selected_frame_level + count - count1);
|
||
}
|
||
|
||
|
||
static void
|
||
down_command (count_exp, from_tty)
|
||
char *count_exp;
|
||
int from_tty;
|
||
{
|
||
down_silently_command (count_exp, from_tty);
|
||
print_stack_frame (selected_frame, selected_frame_level, 1);
|
||
}
|
||
|
||
static void
|
||
return_command (retval_exp, from_tty)
|
||
char *retval_exp;
|
||
int from_tty;
|
||
{
|
||
struct symbol *thisfun;
|
||
FRAME_ADDR selected_frame_addr;
|
||
CORE_ADDR selected_frame_pc;
|
||
FRAME frame;
|
||
value return_value;
|
||
|
||
if (selected_frame == NULL)
|
||
error ("No selected frame.");
|
||
thisfun = get_frame_function (selected_frame);
|
||
selected_frame_addr = FRAME_FP (selected_frame);
|
||
selected_frame_pc = (get_frame_info (selected_frame))->pc;
|
||
|
||
/* Compute the return value (if any -- possibly getting errors here).
|
||
Call VALUE_CONTENTS to make sure we have fully evaluated it, since
|
||
it might live in the stack frame we're about to pop. */
|
||
|
||
if (retval_exp)
|
||
{
|
||
return_value = parse_and_eval (retval_exp);
|
||
VALUE_CONTENTS (return_value);
|
||
}
|
||
|
||
/* If interactive, require confirmation. */
|
||
|
||
if (from_tty)
|
||
{
|
||
if (thisfun != 0)
|
||
{
|
||
if (!query ("Make %s return now? ", SYMBOL_SOURCE_NAME (thisfun)))
|
||
{
|
||
error ("Not confirmed.");
|
||
/* NOTREACHED */
|
||
}
|
||
}
|
||
else
|
||
if (!query ("Make selected stack frame return now? "))
|
||
error ("Not confirmed.");
|
||
}
|
||
|
||
/* Do the real work. Pop until the specified frame is current. We
|
||
use this method because the selected_frame is not valid after
|
||
a POP_FRAME. The pc comparison makes this work even if the
|
||
selected frame shares its fp with another frame. */
|
||
|
||
while ( selected_frame_addr != FRAME_FP (frame = get_current_frame())
|
||
|| selected_frame_pc != (get_frame_info (frame))->pc )
|
||
POP_FRAME;
|
||
|
||
/* Then pop that frame. */
|
||
|
||
POP_FRAME;
|
||
|
||
/* Compute the return value (if any) and store in the place
|
||
for return values. */
|
||
|
||
if (retval_exp)
|
||
set_return_value (return_value);
|
||
|
||
/* If interactive, print the frame that is now current. */
|
||
|
||
if (from_tty)
|
||
frame_command ("0", 1);
|
||
}
|
||
|
||
/* Gets the language of the current frame. */
|
||
enum language
|
||
get_frame_language()
|
||
{
|
||
register struct symtab *s;
|
||
FRAME fr;
|
||
enum language flang; /* The language of the current frame */
|
||
|
||
fr = get_frame_info(selected_frame);
|
||
if(fr)
|
||
{
|
||
s = find_pc_symtab(fr->pc);
|
||
if(s)
|
||
flang = s->language;
|
||
else
|
||
flang = language_unknown;
|
||
}
|
||
else
|
||
flang = language_unknown;
|
||
|
||
return flang;
|
||
}
|
||
|
||
void
|
||
_initialize_stack ()
|
||
{
|
||
#if 0
|
||
backtrace_limit = 30;
|
||
#endif
|
||
|
||
add_com ("return", class_stack, return_command,
|
||
"Make selected stack frame return to its caller.\n\
|
||
Control remains in the debugger, but when you continue\n\
|
||
execution will resume in the frame above the one now selected.\n\
|
||
If an argument is given, it is an expression for the value to return.");
|
||
|
||
add_com ("up", class_stack, up_command,
|
||
"Select and print stack frame that called this one.\n\
|
||
An argument says how many frames up to go.");
|
||
add_com ("up-silently", class_support, up_silently_command,
|
||
"Same as the `up' command, but does not print anything.\n\
|
||
This is useful in command scripts.");
|
||
|
||
add_com ("down", class_stack, down_command,
|
||
"Select and print stack frame called by this one.\n\
|
||
An argument says how many frames down to go.");
|
||
add_com_alias ("do", "down", class_stack, 1);
|
||
add_com_alias ("dow", "down", class_stack, 1);
|
||
add_com ("down-silently", class_support, down_silently_command,
|
||
"Same as the `down' command, but does not print anything.\n\
|
||
This is useful in command scripts.");
|
||
|
||
add_com ("frame", class_stack, frame_command,
|
||
"Select and print a stack frame.\n\
|
||
With no argument, print the selected stack frame. (See also \"info frame\").\n\
|
||
An argument specifies the frame to select.\n\
|
||
It can be a stack frame number or the address of the frame.\n\
|
||
With argument, nothing is printed if input is coming from\n\
|
||
a command file or a user-defined command.");
|
||
|
||
add_com_alias ("f", "frame", class_stack, 1);
|
||
|
||
add_com ("select-frame", class_stack, select_frame_command,
|
||
"Select a stack frame without printing anything.\n\
|
||
An argument specifies the frame to select.\n\
|
||
It can be a stack frame number or the address of the frame.\n");
|
||
|
||
add_com ("backtrace", class_stack, backtrace_command,
|
||
"Print backtrace of all stack frames, or innermost COUNT frames.\n\
|
||
With a negative argument, print outermost -COUNT frames.");
|
||
add_com_alias ("bt", "backtrace", class_stack, 0);
|
||
add_com_alias ("where", "backtrace", class_alias, 0);
|
||
add_info ("stack", backtrace_command,
|
||
"Backtrace of the stack, or innermost COUNT frames.");
|
||
add_info_alias ("s", "stack", 1);
|
||
add_info ("frame", frame_info,
|
||
"All about selected stack frame, or frame at ADDR.");
|
||
add_info_alias ("f", "frame", 1);
|
||
add_info ("locals", locals_info,
|
||
"Local variables of current stack frame.");
|
||
add_info ("args", args_info,
|
||
"Argument variables of current stack frame.");
|
||
add_info ("catch", catch_info,
|
||
"Exceptions that can be caught in the current stack frame.");
|
||
|
||
#if 0
|
||
add_cmd ("backtrace-limit", class_stack, set_backtrace_limit_command,
|
||
"Specify maximum number of frames for \"backtrace\" to print by default.",
|
||
&setlist);
|
||
add_info ("backtrace-limit", backtrace_limit_info,
|
||
"The maximum number of frames for \"backtrace\" to print by default.");
|
||
#endif
|
||
}
|