diff options
Diffstat (limited to 'gdb/stack.c')
| -rw-r--r-- | gdb/stack.c | 2023 |
1 files changed, 2023 insertions, 0 deletions
diff --git a/gdb/stack.c b/gdb/stack.c new file mode 100644 index 0000000..4f41531 --- /dev/null +++ b/gdb/stack.c @@ -0,0 +1,2023 @@ +/* Print and select stack frames for GDB, the GNU debugger. + + Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, + 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002 Free Software + Foundation, Inc. + + This file is part of GDB. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (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, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include <ctype.h> +#include "defs.h" +#include "gdb_string.h" +#include "value.h" +#include "symtab.h" +#include "gdbtypes.h" +#include "expression.h" +#include "language.h" +#include "frame.h" +#include "gdbcmd.h" +#include "gdbcore.h" +#include "target.h" +#include "source.h" +#include "breakpoint.h" +#include "demangle.h" +#include "inferior.h" +#include "annotate.h" +#include "ui-out.h" + +/* Prototypes for exported functions. */ + +void args_info (char *, int); + +void locals_info (char *, int); + +void (*selected_frame_level_changed_hook) (int); + +void _initialize_stack (void); + +/* Prototypes for local functions. */ + +static void return_command (char *, int); + +static void down_command (char *, int); + +static void down_silently_base (char *); + +static void down_silently_command (char *, int); + +static void up_command (char *, int); + +static void up_silently_base (char *); + +static void up_silently_command (char *, int); + +void frame_command (char *, int); + +static void current_frame_command (char *, int); + +static void select_frame_command (char *, int); + +static void print_frame_arg_vars (struct frame_info *, struct ui_file *); + +static void catch_info (char *, int); + +static void args_plus_locals_info (char *, int); + +static void print_frame_label_vars (struct frame_info *, int, + struct ui_file *); + +static void print_frame_local_vars (struct frame_info *, int, + struct ui_file *); + +static int print_block_frame_labels (struct block *, int *, + struct ui_file *); + +static int print_block_frame_locals (struct block *, + struct frame_info *, + int, + struct ui_file *); + +static void print_frame (struct frame_info *fi, + int level, + int source, + int args, + struct symtab_and_line sal); + +static void print_frame_info_base (struct frame_info *, int, int, int); + +static void print_stack_frame_base (struct frame_info *, int, int); + +static void backtrace_command (char *, int); + +struct frame_info *parse_frame_specification (char *); + +static void frame_info (char *, int); + +extern int addressprint; /* Print addresses, or stay symbolic only? */ + +/* The "selected" stack frame is used by default for local and arg access. + May be zero, for no selected frame. */ + +struct frame_info *selected_frame; + +/* Level of the selected frame: + 0 for innermost, 1 for its caller, ... + or -1 for frame specified by address with no defined level. */ + +/* Level of the selected frame: 0 for innermost, 1 for its caller, ... + or -1 for NULL frame. */ + +int +frame_relative_level (struct frame_info *fi) +{ + if (fi == NULL) + return -1; + else + return fi->level; +} + +/* Zero means do things normally; we are interacting directly with the + user. One means print the full filename and linenumber when a + frame is printed, and do so in a format emacs18/emacs19.22 can + parse. Two means print similar annotations, but in many more + cases and in a slightly different syntax. */ + +int annotation_level = 0; + + +struct print_stack_frame_args + { + struct frame_info *fi; + int level; + int source; + int args; + }; + +static int print_stack_frame_base_stub (char *); + +/* Show and print the frame arguments. + Pass the args the way catch_errors wants them. */ +static int show_and_print_stack_frame_stub (void *args); +static int +show_and_print_stack_frame_stub (void *args) +{ + struct print_stack_frame_args *p = (struct print_stack_frame_args *) args; + + print_frame_info (p->fi, p->level, p->source, p->args); + + return 0; +} + +/* Show or print the frame arguments. + Pass the args the way catch_errors wants them. */ +static int print_stack_frame_stub (void *args); +static int +print_stack_frame_stub (void *args) +{ + struct print_stack_frame_args *p = (struct print_stack_frame_args *) args; + + print_frame_info_base (p->fi, p->level, p->source, p->args); + return 0; +} + +/* Print a stack frame briefly. FRAME_INFI should be the frame info + and LEVEL should be its level in the stack (or -1 for level not + defined). */ + +/* Pass the args the way catch_errors wants them. */ +static int +print_stack_frame_base_stub (char *args) +{ + struct print_stack_frame_args *p = (struct print_stack_frame_args *) args; + + print_frame_info_base (p->fi, p->level, p->source, p->args); + return 0; +} + +/* print the frame arguments to the terminal. + Pass the args the way catch_errors wants them. */ +static int print_only_stack_frame_stub (void *); +static int +print_only_stack_frame_stub (void *args) +{ + struct print_stack_frame_args *p = (struct print_stack_frame_args *) args; + + print_frame_info_base (p->fi, p->level, p->source, p->args); + return 0; +} + +/* Print a stack frame briefly. FRAME_INFI should be the frame info + and LEVEL should be its level in the stack (or -1 for level not defined). + This prints the level, the function executing, the arguments, + and the file name and line number. + If the pc is not at the beginning of the source line, + the actual pc is printed at the beginning. + + If SOURCE is 1, print the source line as well. + If SOURCE is -1, print ONLY the source line. */ + +static void +print_stack_frame_base (struct frame_info *fi, int level, int source) +{ + struct print_stack_frame_args args; + + args.fi = fi; + args.level = level; + args.source = source; + args.args = 1; + + catch_errors (print_stack_frame_stub, &args, "", RETURN_MASK_ALL); +} + +/* Show and print a stack frame briefly. FRAME_INFI should be the frame info + and LEVEL should be its level in the stack (or -1 for level not defined). + This prints the level, the function executing, the arguments, + and the file name and line number. + If the pc is not at the beginning of the source line, + the actual pc is printed at the beginning. + + If SOURCE is 1, print the source line as well. + If SOURCE is -1, print ONLY the source line. */ + +void +show_and_print_stack_frame (struct frame_info *fi, int level, int source) +{ + struct print_stack_frame_args args; + + args.fi = fi; + args.level = level; + args.source = source; + args.args = 1; + + catch_errors (show_and_print_stack_frame_stub, &args, "", RETURN_MASK_ALL); +} + + +/* Show or print a stack frame briefly. FRAME_INFI should be the frame info + and LEVEL should be its level in the stack (or -1 for level not defined). + This prints the level, the function executing, the arguments, + and the file name and line number. + If the pc is not at the beginning of the source line, + the actual pc is printed at the beginning. + + If SOURCE is 1, print the source line as well. + If SOURCE is -1, print ONLY the source line. */ + +void +print_stack_frame (struct frame_info *fi, int level, int source) +{ + struct print_stack_frame_args args; + + args.fi = fi; + args.level = level; + args.source = source; + args.args = 1; + + catch_errors (print_stack_frame_stub, (char *) &args, "", RETURN_MASK_ALL); +} + +/* Print a stack frame briefly. FRAME_INFI should be the frame info + and LEVEL should be its level in the stack (or -1 for level not defined). + This prints the level, the function executing, the arguments, + and the file name and line number. + If the pc is not at the beginning of the source line, + the actual pc is printed at the beginning. + + If SOURCE is 1, print the source line as well. + If SOURCE is -1, print ONLY the source line. */ + +void +print_only_stack_frame (struct frame_info *fi, int level, int source) +{ + struct print_stack_frame_args args; + + args.fi = fi; + args.level = level; + args.source = source; + args.args = 1; + + catch_errors (print_only_stack_frame_stub, &args, "", RETURN_MASK_ALL); +} + +struct print_args_args +{ + struct symbol *func; + struct frame_info *fi; + struct ui_file *stream; +}; + +static int print_args_stub (PTR); + +/* Pass the args the way catch_errors wants them. */ + +static int +print_args_stub (PTR args) +{ + int numargs; + struct print_args_args *p = (struct print_args_args *) args; + + numargs = FRAME_NUM_ARGS (p->fi); + print_frame_args (p->func, p->fi, numargs, p->stream); + return 0; +} + +/* Print information about a frame for frame "fi" at level "level". + Used in "where" output, also used to emit breakpoint or step + messages. + LEVEL is the level of the frame, or -1 if it is the + innermost frame but we don't want to print the level. + The meaning of the SOURCE argument is: + SRC_LINE: Print only source line + LOCATION: Print only location + LOC_AND_SRC: Print location and source line. */ + +static void +print_frame_info_base (struct frame_info *fi, int level, int source, int args) +{ + struct symtab_and_line sal; + int source_print; + int location_print; + +#if 0 + char buf[MAX_REGISTER_RAW_SIZE]; + CORE_ADDR sp; + + /* On the 68k, this spends too much time in m68k_find_saved_regs. */ + + /* Get the value of SP_REGNUM relative to the frame. */ + get_saved_register (buf, (int *) NULL, (CORE_ADDR *) NULL, + FRAME_INFO_ID (fi), SP_REGNUM, (enum lval_type *) NULL); + sp = extract_address (buf, REGISTER_RAW_SIZE (SP_REGNUM)); + + /* This is not a perfect test, because if a function alloca's some + memory, puts some code there, and then jumps into it, then the test + will succeed even though there is no call dummy. Probably best is + to check for a bp_call_dummy breakpoint. */ + if (PC_IN_CALL_DUMMY (fi->pc, sp, fi->frame)) +#else + if (frame_in_dummy (fi)) +#endif + { + annotate_frame_begin (level == -1 ? 0 : level, fi->pc); + + /* Do this regardless of SOURCE because we don't have any source + to list for this frame. */ + if (level >= 0) + printf_filtered ("#%-2d ", level); + annotate_function_call (); + printf_filtered ("<function called from gdb>\n"); + annotate_frame_end (); + return; + } + if (fi->signal_handler_caller) + { + annotate_frame_begin (level == -1 ? 0 : level, fi->pc); + + /* Do this regardless of SOURCE because we don't have any source + to list for this frame. */ + if (level >= 0) + printf_filtered ("#%-2d ", level); + annotate_signal_handler_caller (); + printf_filtered ("<signal handler called>\n"); + annotate_frame_end (); + return; + } + + /* If fi is not the innermost frame, that normally means that fi->pc + points to *after* the call instruction, and we want to get the line + containing the call, never the next line. But if the next frame is + a signal_handler_caller or a dummy frame, then the next frame was + not entered as the result of a call, and we want to get the line + containing fi->pc. */ + sal = + find_pc_line (fi->pc, + fi->next != NULL + && !fi->next->signal_handler_caller + && !frame_in_dummy (fi->next)); + + location_print = (source == LOCATION + || source == LOC_AND_ADDRESS + || source == SRC_AND_LOC); + + if (location_print || !sal.symtab) + print_frame (fi, level, source, args, sal); + + source_print = (source == SRC_LINE || source == SRC_AND_LOC); + + if (sal.symtab) + set_current_source_symtab_and_line (&sal); + + if (source_print && sal.symtab) + { + struct symtab_and_line cursal; + int done = 0; + int mid_statement = (source == SRC_LINE) && (fi->pc != sal.pc); + + if (annotation_level) + done = identify_source_line (sal.symtab, sal.line, mid_statement, + fi->pc); + if (!done) + { + if (print_frame_info_listing_hook) + print_frame_info_listing_hook (sal.symtab, sal.line, sal.line + 1, 0); + else + { + /* We used to do this earlier, but that is clearly + wrong. This function is used by many different + parts of gdb, including normal_stop in infrun.c, + which uses this to print out the current PC + when we stepi/nexti into the middle of a source + line. Only the command line really wants this + behavior. Other UIs probably would like the + ability to decide for themselves if it is desired. */ + if (addressprint && mid_statement) + { + ui_out_field_core_addr (uiout, "addr", fi->pc); + ui_out_text (uiout, "\t"); + } + + print_source_lines (sal.symtab, sal.line, sal.line + 1, 0); + } + } + cursal = get_current_or_default_source_symtab_and_line (); + cursal.line = max (sal.line - get_lines_to_list () / 2, 1); + set_current_source_symtab_and_line (&cursal); + } + + if (source != 0) + set_default_breakpoint (1, fi->pc, sal.symtab, sal.line); + + annotate_frame_end (); + + gdb_flush (gdb_stdout); +} + +static void +print_frame (struct frame_info *fi, + int level, + int source, + int args, + struct symtab_and_line sal) +{ + struct symbol *func; + register char *funname = 0; + enum language funlang = language_unknown; + struct ui_stream *stb; + struct cleanup *old_chain; + struct cleanup *list_chain; + + stb = ui_out_stream_new (uiout); + old_chain = make_cleanup_ui_out_stream_delete (stb); + + func = find_pc_function (frame_address_in_block (fi)); + if (func) + { + /* In certain pathological cases, the symtabs give the wrong + function (when we are in the first function in a file which + is compiled without debugging symbols, the previous function + is compiled with debugging symbols, and the "foo.o" symbol + that is supposed to tell us where the file with debugging symbols + ends has been truncated by ar because it is longer than 15 + characters). This also occurs if the user uses asm() to create + a function but not stabs for it (in a file compiled -g). + + So look in the minimal symbol tables as well, and if it comes + up with a larger address for the function use that instead. + I don't think this can ever cause any problems; there shouldn't + be any minimal symbols in the middle of a function; if this is + ever changed many parts of GDB will need to be changed (and we'll + create a find_pc_minimal_function or some such). */ + + struct minimal_symbol *msymbol = lookup_minimal_symbol_by_pc (frame_address_in_block (fi)); + if (msymbol != NULL + && (SYMBOL_VALUE_ADDRESS (msymbol) + > BLOCK_START (SYMBOL_BLOCK_VALUE (func)))) + { +#if 0 + /* There is no particular reason to think the line number + information is wrong. Someone might have just put in + a label with asm() but left the line numbers alone. */ + /* In this case we have no way of knowing the source file + and line number, so don't print them. */ + sal.symtab = 0; +#endif + /* We also don't know anything about the function besides + its address and name. */ + func = 0; + funname = SYMBOL_NAME (msymbol); + funlang = SYMBOL_LANGUAGE (msymbol); + } + else + { + /* I'd like to use SYMBOL_SOURCE_NAME() here, to display the + demangled name that we already have stored in the symbol + table, but we stored a version with DMGL_PARAMS turned + on, and here we don't want to display parameters. So call + the demangler again, with DMGL_ANSI only. (Yes, I know + that printf_symbol_filtered() will again try to demangle + the name on the fly, but the issue is that if + cplus_demangle() fails here, it'll fail there too. So we + want to catch the failure ("demangled==NULL" case below) + here, while we still have our hands on the function + symbol.) */ + char *demangled; + funname = SYMBOL_NAME (func); + funlang = SYMBOL_LANGUAGE (func); + if (funlang == language_cplus) + { + demangled = cplus_demangle (funname, DMGL_ANSI); + if (demangled == NULL) + /* If the demangler fails, try the demangled name from + the symbol table. This'll have parameters, but + that's preferable to diplaying a mangled name. */ + funname = SYMBOL_SOURCE_NAME (func); + } + } + } + else + { + struct minimal_symbol *msymbol = lookup_minimal_symbol_by_pc (frame_address_in_block (fi)); + if (msymbol != NULL) + { + funname = SYMBOL_NAME (msymbol); + funlang = SYMBOL_LANGUAGE (msymbol); + } + } + + annotate_frame_begin (level == -1 ? 0 : level, fi->pc); + + list_chain = make_cleanup_ui_out_tuple_begin_end (uiout, "frame"); + + if (level >= 0) + { + ui_out_text (uiout, "#"); + ui_out_field_fmt (uiout, "level", "%-2d", level); + ui_out_spaces (uiout, 1); + } + if (addressprint) + if (fi->pc != sal.pc || !sal.symtab || source == LOC_AND_ADDRESS) + { + annotate_frame_address (); + ui_out_field_core_addr (uiout, "addr", fi->pc); + annotate_frame_address_end (); + ui_out_text (uiout, " in "); + } + annotate_frame_function_name (); + fprintf_symbol_filtered (stb->stream, funname ? funname : "??", funlang, + DMGL_ANSI); + ui_out_field_stream (uiout, "func", stb); + ui_out_wrap_hint (uiout, " "); + annotate_frame_args (); + + ui_out_text (uiout, " ("); + if (args) + { + struct print_args_args args; + struct cleanup *args_list_chain; + args.fi = fi; + args.func = func; + args.stream = gdb_stdout; + args_list_chain = make_cleanup_ui_out_list_begin_end (uiout, "args"); + catch_errors (print_args_stub, &args, "", RETURN_MASK_ALL); + /* FIXME: args must be a list. If one argument is a string it will + have " that will not be properly escaped. */ + /* Invoke ui_out_tuple_end. */ + do_cleanups (args_list_chain); + QUIT; + } + ui_out_text (uiout, ")"); + if (sal.symtab && sal.symtab->filename) + { + annotate_frame_source_begin (); + ui_out_wrap_hint (uiout, " "); + ui_out_text (uiout, " at "); + annotate_frame_source_file (); + ui_out_field_string (uiout, "file", sal.symtab->filename); + annotate_frame_source_file_end (); + ui_out_text (uiout, ":"); + annotate_frame_source_line (); + ui_out_field_int (uiout, "line", sal.line); + annotate_frame_source_end (); + } + +#ifdef PC_SOLIB + if (!funname || (!sal.symtab || !sal.symtab->filename)) + { + char *lib = PC_SOLIB (fi->pc); + if (lib) + { + annotate_frame_where (); + ui_out_wrap_hint (uiout, " "); + ui_out_text (uiout, " from "); + ui_out_field_string (uiout, "from", lib); + } + } +#endif /* PC_SOLIB */ + + /* do_cleanups will call ui_out_tuple_end() for us. */ + do_cleanups (list_chain); + ui_out_text (uiout, "\n"); + do_cleanups (old_chain); +} + + +/* Show or print the frame info. If this is the tui, it will be shown in + the source display */ +void +print_frame_info (struct frame_info *fi, register int level, int source, + int args) +{ + print_frame_info_base (fi, level, source, args); +} + +/* Show the frame info. If this is the tui, it will be shown in + the source display otherwise, nothing is done */ +void +show_stack_frame (struct frame_info *fi) +{ +} + + +/* Read a frame specification in whatever the appropriate format is. + Call error() if the specification is in any way invalid (i.e. + this function never returns NULL). */ + +struct frame_info * +parse_frame_specification (char *frame_exp) +{ + int numargs = 0; +#define MAXARGS 4 + CORE_ADDR args[MAXARGS]; + int level; + + if (frame_exp) + { + char *addr_string, *p; + struct cleanup *tmp_cleanup; + + while (*frame_exp == ' ') + frame_exp++; + + while (*frame_exp) + { + if (numargs > MAXARGS) + error ("Too many args in frame specification"); + /* Parse an argument. */ + for (p = frame_exp; *p && *p != ' '; p++) + ; + addr_string = savestring (frame_exp, p - frame_exp); + + { + struct value *vp; + + tmp_cleanup = make_cleanup (xfree, addr_string); + + /* NOTE: we call parse_and_eval and then both + value_as_long and value_as_address rather than calling + parse_and_eval_long and parse_and_eval_address because + of the issue of potential side effects from evaluating + the expression. */ + vp = parse_and_eval (addr_string); + if (numargs == 0) + level = value_as_long (vp); + + args[numargs++] = value_as_address (vp); + do_cleanups (tmp_cleanup); + } + + /* Skip spaces, move to possible next arg. */ + while (*p == ' ') + p++; + frame_exp = p; + } + } + + switch (numargs) + { + case 0: + if (selected_frame == NULL) + error ("No selected frame."); + return selected_frame; + /* NOTREACHED */ + case 1: + { + struct frame_info *fid = + find_relative_frame (get_current_frame (), &level); + struct frame_info *tfid; + + if (level == 0) + /* find_relative_frame was successful */ + return fid; + + /* If SETUP_ARBITRARY_FRAME is defined, then frame specifications + take at least 2 addresses. It is important to detect this case + here so that "frame 100" does not give a confusing error message + like "frame specification requires two addresses". This of course + does not solve the "frame 100" problem for machines on which + a frame specification can be made with one address. To solve + that, we need a new syntax for a specifying a frame by address. + I think the cleanest syntax is $frame(0x45) ($frame(0x23,0x45) for + two args, etc.), but people might think that is too much typing, + so I guess *0x23,0x45 would be a possible alternative (commas + really should be used instead of spaces to delimit; using spaces + normally works in an expression). */ +#ifdef SETUP_ARBITRARY_FRAME + error ("No frame %s", paddr_d (args[0])); +#endif + + /* If (s)he specifies the frame with an address, he deserves what + (s)he gets. Still, give the highest one that matches. */ + + for (fid = get_current_frame (); + fid && fid->frame != args[0]; + fid = get_prev_frame (fid)) + ; + + if (fid) + while ((tfid = get_prev_frame (fid)) && + (tfid->frame == args[0])) + fid = tfid; + + /* We couldn't identify the frame as an existing frame, but + perhaps we can create one with a single argument. */ + } + + default: +#ifdef SETUP_ARBITRARY_FRAME + return SETUP_ARBITRARY_FRAME (numargs, args); +#else + /* Usual case. Do it here rather than have everyone supply + a SETUP_ARBITRARY_FRAME that does this. */ + if (numargs == 1) + return create_new_frame (args[0], 0); + error ("Too many args in frame specification"); +#endif + /* NOTREACHED */ + } + /* NOTREACHED */ +} + +/* FRAME_ARGS_ADDRESS_CORRECT is just like FRAME_ARGS_ADDRESS except + that if it is unsure about the answer, it returns 0 + instead of guessing (this happens on the VAX and i960, for example). + + On most machines, we never have to guess about the args address, + so FRAME_ARGS_ADDRESS{,_CORRECT} are the same. */ +#if !defined (FRAME_ARGS_ADDRESS_CORRECT) +#define FRAME_ARGS_ADDRESS_CORRECT FRAME_ARGS_ADDRESS +#endif + +/* Print verbosely the selected frame or the frame at address ADDR. + This means absolutely all information in the frame is printed. */ + +static void +frame_info (char *addr_exp, int from_tty) +{ + struct frame_info *fi; + struct symtab_and_line sal; + struct symbol *func; + struct symtab *s; + struct frame_info *calling_frame_info; + int i, count, numregs; + char *funname = 0; + enum language funlang = language_unknown; + + if (!target_has_stack) + error ("No stack."); + + fi = parse_frame_specification (addr_exp); + if (fi == NULL) + error ("Invalid frame specified."); + + sal = find_pc_line (fi->pc, + fi->next != NULL + && !fi->next->signal_handler_caller + && !frame_in_dummy (fi->next)); + func = get_frame_function (fi); + s = find_pc_symtab (fi->pc); + if (func) + { + /* I'd like to use SYMBOL_SOURCE_NAME() here, to display + * the demangled name that we already have stored in + * the symbol table, but we stored a version with + * DMGL_PARAMS turned on, and here we don't want + * to display parameters. So call the demangler again, + * with DMGL_ANSI only. RT + * (Yes, I know that printf_symbol_filtered() will + * again try to demangle the name on the fly, but + * the issue is that if cplus_demangle() fails here, + * it'll fail there too. So we want to catch the failure + * ("demangled==NULL" case below) here, while we still + * have our hands on the function symbol.) + */ + char *demangled; + funname = SYMBOL_NAME (func); + funlang = SYMBOL_LANGUAGE (func); + if (funlang == language_cplus) + { + demangled = cplus_demangle (funname, DMGL_ANSI); + /* If the demangler fails, try the demangled name + * from the symbol table. This'll have parameters, + * but that's preferable to diplaying a mangled name. + */ + if (demangled == NULL) + funname = SYMBOL_SOURCE_NAME (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_info = get_prev_frame (fi); + + if (!addr_exp && frame_relative_level (selected_frame) >= 0) + { + printf_filtered ("Stack level %d, frame at ", + frame_relative_level (selected_frame)); + print_address_numeric (fi->frame, 1, gdb_stdout); + printf_filtered (":\n"); + } + else + { + printf_filtered ("Stack frame at "); + print_address_numeric (fi->frame, 1, gdb_stdout); + printf_filtered (":\n"); + } + printf_filtered (" %s = ", REGISTER_NAME (PC_REGNUM)); + print_address_numeric (fi->pc, 1, gdb_stdout); + + wrap_here (" "); + if (funname) + { + printf_filtered (" in "); + fprintf_symbol_filtered (gdb_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 ", REGISTER_NAME (PC_REGNUM)); + print_address_numeric (FRAME_SAVED_PC (fi), 1, gdb_stdout); + printf_filtered ("\n"); + + { + int frameless; + frameless = FRAMELESS_FUNCTION_INVOCATION (fi); + if (frameless) + printf_filtered (" (FRAMELESS),"); + } + + if (calling_frame_info) + { + printf_filtered (" called by frame at "); + print_address_numeric (calling_frame_info->frame, 1, gdb_stdout); + } + if (fi->next && calling_frame_info) + puts_filtered (","); + wrap_here (" "); + if (fi->next) + { + printf_filtered (" caller of frame at "); + print_address_numeric (fi->next->frame, 1, gdb_stdout); + } + if (fi->next || calling_frame_info) + 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 "); + print_address_numeric (arg_list, 1, gdb_stdout); + printf_filtered (","); + + numargs = FRAME_NUM_ARGS (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, gdb_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 "); + print_address_numeric (arg_list, 1, gdb_stdout); + printf_filtered (","); + } + } + + if (fi->saved_regs == NULL) + FRAME_INIT_SAVED_REGS (fi); + /* Print as much information as possible on the location of all the + registers. */ + { + enum lval_type lval; + int optimized; + CORE_ADDR addr; + int realnum; + int count; + int i; + int need_nl = 1; + + /* The sp is special; what's displayed isn't the save address, but + the value of the previous frame's sp. This is a legacy thing, + at one stage the frame cached the previous frame's SP instead + of its address, hence it was easiest to just display the cached + value. */ + if (SP_REGNUM >= 0) + { + /* Find out the location of the saved stack pointer with out + actually evaluating it. */ + frame_register_unwind (fi, SP_REGNUM, &optimized, &lval, &addr, + &realnum, NULL); + if (!optimized && lval == not_lval) + { + void *value = alloca (MAX_REGISTER_RAW_SIZE); + CORE_ADDR sp; + frame_register_unwind (fi, SP_REGNUM, &optimized, &lval, &addr, + &realnum, value); + sp = extract_address (value, REGISTER_RAW_SIZE (SP_REGNUM)); + printf_filtered (" Previous frame's sp is "); + print_address_numeric (sp, 1, gdb_stdout); + printf_filtered ("\n"); + need_nl = 0; + } + else if (!optimized && lval == lval_memory) + { + printf_filtered (" Previous frame's sp at "); + print_address_numeric (addr, 1, gdb_stdout); + printf_filtered ("\n"); + need_nl = 0; + } + else if (!optimized && lval == lval_register) + { + printf_filtered (" Previous frame's sp in %s\n", + REGISTER_NAME (realnum)); + need_nl = 0; + } + /* else keep quiet. */ + } + + count = 0; + numregs = NUM_REGS + NUM_PSEUDO_REGS; + for (i = 0; i < numregs; i++) + if (i != SP_REGNUM) + { + /* Find out the location of the saved register without + fetching the corresponding value. */ + frame_register_unwind (fi, i, &optimized, &lval, &addr, &realnum, + NULL); + /* For moment, only display registers that were saved on the + stack. */ + if (!optimized && lval == lval_memory) + { + if (count == 0) + puts_filtered (" Saved registers:\n "); + else + puts_filtered (","); + wrap_here (" "); + printf_filtered (" %s at ", REGISTER_NAME (i)); + print_address_numeric (addr, 1, gdb_stdout); + count++; + } + } + if (count || need_nl) + puts_filtered ("\n"); + } +} + +#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 (char *count_exp, int from_tty) +{ + int count = parse_and_eval_long (count_exp); + + if (count < 0) + error ("Negative argument not meaningful as backtrace limit."); + + backtrace_limit = count; +} + +static void +backtrace_limit_info (char *arg, int from_tty) +{ + if (arg) + error ("\"Info backtrace-limit\" takes no arguments."); + + printf_unfiltered ("Backtrace limit: %d.\n", backtrace_limit); +} +#endif + +/* Print briefly all stack frames or just the innermost COUNT frames. */ + +static void backtrace_command_1 (char *count_exp, int show_locals, + int from_tty); +static void +backtrace_command_1 (char *count_exp, int show_locals, int from_tty) +{ + struct frame_info *fi; + register int count; + register int i; + register struct frame_info *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 (); + + /* The target can be in a state where there is no valid frames + (e.g., just connected). */ + if (trailing == NULL) + error ("No stack."); + + trailing_level = 0; + if (count_exp) + { + count = parse_and_eval_long (count_exp); + if (count < 0) + { + struct frame_info *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 (fi = trailing; + fi != NULL && i--; + fi = get_prev_frame (fi)) + { + QUIT; + ps = find_pc_psymtab (frame_address_in_block (fi)); + if (ps) + PSYMTAB_TO_SYMTAB (ps); /* Force syms to come in */ + } + } + + for (i = 0, fi = trailing; + fi && count--; + i++, fi = get_prev_frame (fi)) + { + QUIT; + + /* Don't use print_stack_frame; if an error() occurs it probably + means further attempts to backtrace would fail (on the other + hand, perhaps the code does or could be fixed to make sure + the frame->prev field gets set to NULL in that case). */ + print_frame_info_base (fi, trailing_level + i, 0, 1); + if (show_locals) + print_frame_local_vars (fi, 1, gdb_stdout); + } + + /* If we've stopped before the end, mention that. */ + if (fi && from_tty) + printf_filtered ("(More stack frames follow...)\n"); +} + +static void +backtrace_command (char *arg, int from_tty) +{ + struct cleanup *old_chain = (struct cleanup *) NULL; + char **argv = (char **) NULL; + int argIndicatingFullTrace = (-1), totArgLen = 0, argc = 0; + char *argPtr = arg; + + if (arg != (char *) NULL) + { + int i; + + argv = buildargv (arg); + old_chain = make_cleanup_freeargv (argv); + argc = 0; + for (i = 0; (argv[i] != (char *) NULL); i++) + { + unsigned int j; + + for (j = 0; (j < strlen (argv[i])); j++) + argv[i][j] = tolower (argv[i][j]); + + if (argIndicatingFullTrace < 0 && subset_compare (argv[i], "full")) + argIndicatingFullTrace = argc; + else + { + argc++; + totArgLen += strlen (argv[i]); + } + } + totArgLen += argc; + if (argIndicatingFullTrace >= 0) + { + if (totArgLen > 0) + { + argPtr = (char *) xmalloc (totArgLen + 1); + if (!argPtr) + nomem (0); + else + { + memset (argPtr, 0, totArgLen + 1); + for (i = 0; (i < (argc + 1)); i++) + { + if (i != argIndicatingFullTrace) + { + strcat (argPtr, argv[i]); + strcat (argPtr, " "); + } + } + } + } + else + argPtr = (char *) NULL; + } + } + + backtrace_command_1 (argPtr, (argIndicatingFullTrace >= 0), from_tty); + + if (argIndicatingFullTrace >= 0 && totArgLen > 0) + xfree (argPtr); + + if (old_chain) + do_cleanups (old_chain); +} + +static void backtrace_full_command (char *arg, int from_tty); +static void +backtrace_full_command (char *arg, int from_tty) +{ + backtrace_command_1 (arg, 1, from_tty); +} + + +/* 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 (struct block *b, register struct frame_info *fi, + int num_tabs, register struct ui_file *stream) +{ + register int i, j; + register struct symbol *sym; + register int values_printed = 0; + + ALL_BLOCK_SYMBOLS (b, i, sym) + { + switch (SYMBOL_CLASS (sym)) + { + case LOC_LOCAL: + case LOC_REGISTER: + case LOC_STATIC: + case LOC_BASEREG: + values_printed = 1; + for (j = 0; j < num_tabs; j++) + fputs_filtered ("\t", stream); + fputs_filtered (SYMBOL_SOURCE_NAME (sym), stream); + fputs_filtered (" = ", stream); + print_variable_value (sym, fi, stream); + fprintf_filtered (stream, "\n"); + break; + + default: + /* Ignore symbols which are not locals. */ + break; + } + } + return values_printed; +} + +/* Same, but print labels. */ + +static int +print_block_frame_labels (struct block *b, int *have_default, + register struct ui_file *stream) +{ + register int i; + register struct symbol *sym; + register int values_printed = 0; + + ALL_BLOCK_SYMBOLS (b, i, sym) + { + 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, " "); + print_address_numeric (SYMBOL_VALUE_ADDRESS (sym), 1, stream); + } + 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 (register struct frame_info *fi, register int num_tabs, + register struct ui_file *stream) +{ + register struct block *block = get_frame_block (fi, 0); + 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, fi, num_tabs, 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 (register struct frame_info *fi, int this_level_only, + register struct ui_file *stream) +{ + register struct blockvector *bl; + register struct block *block = get_frame_block (fi, 0); + register int values_printed = 0; + int index, have_default = 0; + char *blocks_printed; + 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 */ +void +locals_info (char *args, int from_tty) +{ + if (!selected_frame) + error ("No frame selected."); + print_frame_local_vars (selected_frame, 0, gdb_stdout); +} + +static void +catch_info (char *ignore, int from_tty) +{ + struct symtab_and_line *sal; + + /* Check for target support for exception handling */ + sal = target_enable_exception_callback (EX_EVENT_CATCH, 1); + if (sal) + { + /* Currently not handling this */ + /* Ideally, here we should interact with the C++ runtime + system to find the list of active handlers, etc. */ + fprintf_filtered (gdb_stdout, "Info catch not supported with this target/compiler combination.\n"); +#if 0 + if (!selected_frame) + error ("No frame selected."); +#endif + } + else + { + /* Assume g++ compiled code -- old v 4.16 behaviour */ + if (!selected_frame) + error ("No frame selected."); + + print_frame_label_vars (selected_frame, 0, gdb_stdout); + } +} + +static void +print_frame_arg_vars (register struct frame_info *fi, + register struct ui_file *stream) +{ + struct symbol *func = get_frame_function (fi); + register struct block *b; + 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); + ALL_BLOCK_SYMBOLS (b, i, sym) + { + switch (SYMBOL_CLASS (sym)) + { + case LOC_ARG: + case LOC_LOCAL_ARG: + case LOC_REF_ARG: + case LOC_REGPARM: + case LOC_REGPARM_ADDR: + case LOC_BASEREG_ARG: + 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, fi, stream); + fprintf_filtered (stream, "\n"); + break; + + default: + /* Don't worry about things which aren't arguments. */ + break; + } + } + if (!values_printed) + { + fprintf_filtered (stream, "No arguments.\n"); + } +} + +void +args_info (char *ignore, int from_tty) +{ + if (!selected_frame) + error ("No frame selected."); + print_frame_arg_vars (selected_frame, gdb_stdout); +} + + +static void +args_plus_locals_info (char *ignore, int from_tty) +{ + args_info (ignore, from_tty); + locals_info (ignore, from_tty); +} + + +/* Select frame FI (or NULL - to invalidate the current frame). */ + +void +select_frame (struct frame_info *fi) +{ + register struct symtab *s; + + selected_frame = fi; + /* NOTE: cagney/2002-05-04: FI can be NULL. This occures when the + frame is being invalidated. */ + if (selected_frame_level_changed_hook) + selected_frame_level_changed_hook (frame_relative_level (fi)); + + /* FIXME: kseitz/2002-08-28: It would be nice to call + selected_frame_level_changed_event right here, but due to limitations + in the current interfaces, we would end up flooding UIs with events + because select_frame is used extensively internally. + + Once we have frame-parameterized frame (and frame-related) commands, + the event notification can be moved here, since this function will only + be called when the users selected frame is being changed. */ + + /* Ensure that symbols for this frame are read in. Also, determine the + source language of this frame, and switch to it if desired. */ + if (fi) + { + s = find_pc_symtab (fi->pc); + if (s + && s->language != current_language->la_language + && s->language != language_unknown + && language_mode == language_mode_auto) + { + set_language (s->language); + } + } +} + + +/* Select frame FI. Also print the stack frame and show the source if + this is the tui version. */ +static void +select_and_print_frame (struct frame_info *fi) +{ + select_frame (fi); + if (fi) + { + print_stack_frame (fi, frame_relative_level (fi), 1); + } +} + +/* Return the symbol-block in which the selected frame is executing. + Can return zero under various legitimate circumstances. + + If ADDR_IN_BLOCK is non-zero, set *ADDR_IN_BLOCK to the relevant + code address within the block returned. We use this to decide + which macros are in scope. */ + +struct block * +get_selected_block (CORE_ADDR *addr_in_block) +{ + if (!target_has_stack) + return 0; + + if (!selected_frame) + return get_current_block (addr_in_block); + return get_frame_block (selected_frame, addr_in_block); +} + +/* 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. */ + +struct frame_info * +find_relative_frame (register struct frame_info *frame, + register int *level_offset_ptr) +{ + register struct frame_info *prev; + register struct frame_info *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 */ +void +select_frame_command_wrapper (char *level_exp, int from_tty) +{ + select_frame_command (level_exp, from_tty); +} + +static void +select_frame_command (char *level_exp, int from_tty) +{ + struct frame_info *frame; + int level = frame_relative_level (selected_frame); + + if (!target_has_stack) + error ("No stack."); + + frame = parse_frame_specification (level_exp); + + select_frame (frame); + if (level != frame_relative_level (selected_frame)) + selected_frame_level_changed_event (frame_relative_level (selected_frame)); +} + +/* The "frame" command. With no arg, print selected frame briefly. + With arg, behaves like select_frame and then prints the selected + frame. */ + +void +frame_command (char *level_exp, int from_tty) +{ + select_frame_command (level_exp, from_tty); + show_and_print_stack_frame (selected_frame, + frame_relative_level (selected_frame), 1); +} + +/* The XDB Compatibility command to print the current frame. */ + +static void +current_frame_command (char *level_exp, int from_tty) +{ + if (target_has_stack == 0 || selected_frame == 0) + error ("No stack."); + print_only_stack_frame (selected_frame, + frame_relative_level (selected_frame), 1); +} + +/* Select the frame up one or COUNT stack levels + from the previously selected frame, and print it briefly. */ + +/* ARGSUSED */ +static void +up_silently_base (char *count_exp) +{ + register struct frame_info *fi; + int count = 1, count1; + if (count_exp) + count = parse_and_eval_long (count_exp); + count1 = count; + + if (target_has_stack == 0 || selected_frame == 0) + error ("No stack."); + + fi = find_relative_frame (selected_frame, &count1); + if (count1 != 0 && count_exp == 0) + error ("Initial frame selected; you cannot go up."); + select_frame (fi); + selected_frame_level_changed_event (frame_relative_level (selected_frame)); +} + +static void +up_silently_command (char *count_exp, int from_tty) +{ + up_silently_base (count_exp); +} + +static void +up_command (char *count_exp, int from_tty) +{ + up_silently_base (count_exp); + show_and_print_stack_frame (selected_frame, + frame_relative_level (selected_frame), 1); +} + +/* Select the frame down one or COUNT stack levels + from the previously selected frame, and print it briefly. */ + +/* ARGSUSED */ +static void +down_silently_base (char *count_exp) +{ + register struct frame_info *frame; + int count = -1, count1; + if (count_exp) + count = -parse_and_eval_long (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) + { + + /* We only do this if count_exp is not specified. That way "down" + means to really go down (and let me know if that is + impossible), but "down 9999" can be used to mean go all the way + down without getting an error. */ + + error ("Bottom (i.e., innermost) frame selected; you cannot go down."); + } + + select_frame (frame); + selected_frame_level_changed_event (frame_relative_level (selected_frame)); +} + +/* ARGSUSED */ +static void +down_silently_command (char *count_exp, int from_tty) +{ + down_silently_base (count_exp); +} + +static void +down_command (char *count_exp, int from_tty) +{ + down_silently_base (count_exp); + show_and_print_stack_frame (selected_frame, + frame_relative_level (selected_frame), 1); +} + +void +return_command_wrapper (char *retval_exp, int from_tty) +{ + return_command (retval_exp, from_tty); +} + +static void +return_command (char *retval_exp, int from_tty) +{ + struct symbol *thisfun; + CORE_ADDR selected_frame_addr; + CORE_ADDR selected_frame_pc; + struct frame_info *frame; + struct value *return_value = NULL; + + if (selected_frame == NULL) + error ("No selected frame."); + thisfun = get_frame_function (selected_frame); + selected_frame_addr = FRAME_FP (selected_frame); + selected_frame_pc = selected_frame->pc; + + /* Compute the return value (if any -- possibly getting errors here). */ + + if (retval_exp) + { + struct type *return_type = NULL; + + return_value = parse_and_eval (retval_exp); + + /* Cast return value to the return type of the function. */ + if (thisfun != NULL) + return_type = TYPE_TARGET_TYPE (SYMBOL_TYPE (thisfun)); + if (return_type == NULL) + return_type = builtin_type_int; + return_value = value_cast (return_type, return_value); + + /* Make sure we have fully evaluated it, since + it might live in the stack frame we're about to pop. */ + if (VALUE_LAZY (return_value)) + value_fetch_lazy (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 = get_current_frame ())->frame + || selected_frame_pc != 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 we are at the end of a call dummy now, pop the dummy frame too. */ + + if (CALL_DUMMY_HAS_COMPLETED (read_pc(), read_sp (), + FRAME_FP (get_current_frame ()))) + POP_FRAME; + + /* If interactive, print the frame that is now current. */ + + if (from_tty) + frame_command ("0", 1); + else + select_frame_command ("0", 0); +} + +/* Sets the scope to input function name, provided that the + function is within the current stack frame */ + +struct function_bounds +{ + CORE_ADDR low, high; +}; + +static void func_command (char *arg, int from_tty); +static void +func_command (char *arg, int from_tty) +{ + struct frame_info *fp; + int found = 0; + struct symtabs_and_lines sals; + int i; + int level = 1; + struct function_bounds *func_bounds = (struct function_bounds *) NULL; + + if (arg != (char *) NULL) + return; + + fp = parse_frame_specification ("0"); + sals = decode_line_spec (arg, 1); + func_bounds = (struct function_bounds *) xmalloc ( + sizeof (struct function_bounds) * sals.nelts); + for (i = 0; (i < sals.nelts && !found); i++) + { + if (sals.sals[i].pc == (CORE_ADDR) 0 || + find_pc_partial_function (sals.sals[i].pc, + (char **) NULL, + &func_bounds[i].low, + &func_bounds[i].high) == 0) + { + func_bounds[i].low = + func_bounds[i].high = (CORE_ADDR) NULL; + } + } + + do + { + for (i = 0; (i < sals.nelts && !found); i++) + found = (fp->pc >= func_bounds[i].low && + fp->pc < func_bounds[i].high); + if (!found) + { + level = 1; + fp = find_relative_frame (fp, &level); + } + } + while (!found && level == 0); + + if (func_bounds) + xfree (func_bounds); + + if (!found) + printf_filtered ("'%s' not within current stack frame.\n", arg); + else if (fp != selected_frame) + select_and_print_frame (fp); +} + +/* Gets the language of the current frame. */ + +enum language +get_frame_language (void) +{ + register struct symtab *s; + enum language flang; /* The language of the current frame */ + + if (selected_frame) + { + s = find_pc_symtab (selected_frame->pc); + if (s) + flang = s->language; + else + flang = language_unknown; + } + else + flang = language_unknown; + + return flang; +} + +void +_initialize_stack (void) +{ +#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); + + if (xdb_commands) + { + add_com ("L", class_stack, current_frame_command, + "Print the current stack frame.\n"); + add_com_alias ("V", "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.\n\ +Use of the 'full' qualifier also prints the values of the local variables.\n"); + add_com_alias ("bt", "backtrace", class_stack, 0); + if (xdb_commands) + { + add_com_alias ("t", "backtrace", class_stack, 0); + add_com ("T", class_stack, backtrace_full_command, + "Print backtrace of all stack frames, or innermost COUNT frames \n\ +and the values of the local variables.\n\ +With a negative argument, print outermost -COUNT frames.\n\ +Usage: T <count>\n"); + } + + 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."); + if (xdb_commands) + add_com ("l", class_info, args_plus_locals_info, + "Argument and local variables of current stack frame."); + + if (dbx_commands) + add_com ("func", class_stack, func_command, + "Select the stack frame that contains <func>.\nUsage: func <name>\n"); + + 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 +} |