diff options
Diffstat (limited to 'gdb/stack.c')
| -rw-r--r-- | gdb/stack.c | 238 |
1 files changed, 126 insertions, 112 deletions
diff --git a/gdb/stack.c b/gdb/stack.c index 2c5145c..8ae4471 100644 --- a/gdb/stack.c +++ b/gdb/stack.c @@ -102,8 +102,6 @@ static void print_frame (struct frame_info *fi, 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? */ @@ -702,122 +700,149 @@ 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). */ + Call error() if the specification is in any way invalid (i.e. this + function never returns NULL). When SEPECTED_P is non-NULL set it's + target to indicate that the default selected frame was used. */ -struct frame_info * -parse_frame_specification (char *frame_exp) +static struct frame_info * +parse_frame_specification_1 (const char *frame_exp, const char *message, + int *selected_frame_p) { - int numargs = 0; -#define MAXARGS 4 - CORE_ADDR args[MAXARGS]; - int level; + int numargs; + struct value *args[4]; + CORE_ADDR addrs[ARRAY_SIZE (args)]; - if (frame_exp) + if (frame_exp == NULL) + numargs = 0; + else { - char *addr_string, *p; + char *addr_string; struct cleanup *tmp_cleanup; - while (*frame_exp == ' ') - frame_exp++; - - while (*frame_exp) + numargs = 0; + while (1) { - 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); - } + char *addr_string; + struct cleanup *cleanup; + const char *p; + + /* Skip leading white space, bail of EOL. */ + while (isspace (*frame_exp)) + frame_exp++; + if (!*frame_exp) + break; - /* Skip spaces, move to possible next arg. */ - while (*p == ' ') - p++; + /* Parse the argument, extract it, save it. */ + for (p = frame_exp; + *p && !isspace (*p); + p++); + addr_string = savestring (frame_exp, p - frame_exp); frame_exp = p; + cleanup = make_cleanup (xfree, addr_string); + + /* NOTE: Parse and evaluate expression, but do not use + functions such as parse_and_eval_long or + parse_and_eval_address to also extract the value. + Instead value_as_long and value_as_address are used. + This avoids problems with expressions that contain + side-effects. */ + if (numargs >= ARRAY_SIZE (args)) + error ("Too many args in frame specification"); + args[numargs++] = parse_and_eval (addr_string); + + do_cleanups (cleanup); } } - switch (numargs) + /* If no args, default to the selected frame. */ + if (numargs == 0) { - case 0: - if (deprecated_selected_frame == NULL) - error ("No selected frame."); - return deprecated_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 (selected_frame_p != NULL) + (*selected_frame_p) = 1; + return get_selected_frame (message); + } - /* If (s)he specifies the frame with an address, he deserves what - (s)he gets. Still, give the highest one that matches. */ + /* None of the remaining use the selected frame. */ + if (selected_frame_p != NULL) + (*selected_frame_p) = 1; - for (fid = get_current_frame (); - fid && get_frame_base (fid) != args[0]; - fid = get_prev_frame (fid)) - ; + /* Assume the single arg[0] is an integer, and try using that to + select a frame relative to current. */ + if (numargs == 1) + { + struct frame_info *fid; + int level = value_as_long (args[0]); + fid = find_relative_frame (get_current_frame (), &level); + if (level == 0) + /* find_relative_frame was successful */ + return fid; + } - if (fid) - while ((tfid = get_prev_frame (fid)) && - (get_frame_base (tfid) == args[0])) - fid = tfid; + /* Convert each value into a corresponding address. */ + { + int i; + for (i = 0; i < numargs; i++) + addrs[i] = value_as_address (args[0]); + } - /* We couldn't identify the frame as an existing frame, but - perhaps we can create one with a single argument. */ + /* Assume that the single arg[0] is an address, use that to identify + a frame with a matching ID. Should this also accept stack/pc or + stack/pc/special. */ + if (numargs == 1) + { + struct frame_id id = frame_id_build_wild (addrs[0]); + struct frame_info *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 (addrs[0])); +#endif + /* If (s)he specifies the frame with an address, he deserves + what (s)he gets. Still, give the highest one that matches. + (NOTE: cagney/2004-10-29: Why highest, or outer-most, I don't + know). */ + for (fid = get_current_frame (); + fid != NULL; + fid = get_prev_frame (fid)) + { + if (frame_id_eq (id, get_frame_id (fid))) + { + while (frame_id_eq (id, frame_unwind_id (fid))) + fid = get_prev_frame (fid); + return fid; + } + } } - default: + /* We couldn't identify the frame as an existing frame, but + perhaps we can create one with a single argument. */ #ifdef SETUP_ARBITRARY_FRAME - return SETUP_ARBITRARY_FRAME (numargs, args); + return SETUP_ARBITRARY_FRAME (numargs, addrs); #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"); + /* Usual case. Do it here rather than have everyone supply a + SETUP_ARBITRARY_FRAME that does this. */ + if (numargs == 1) + return create_new_frame (addrs[0], 0); + error ("Too many args in frame specification"); #endif - /* NOTREACHED */ - } - /* NOTREACHED */ +} + +struct frame_info * +parse_frame_specification (char *frame_exp) +{ + return parse_frame_specification_1 (frame_exp, NULL, NULL); } /* Print verbosely the selected frame or the frame at address ADDR. @@ -835,9 +860,9 @@ frame_info (char *addr_exp, int from_tty) char *funname = 0; enum language funlang = language_unknown; const char *pc_regname; + int selected_frame_p; - if (!target_has_stack) - error ("No stack."); + fi = parse_frame_specification_1 (addr_exp, "No stack.", &selected_frame_p); /* Name of the value returned by get_frame_pc(). Per comments, "pc" is not a good name. */ @@ -853,10 +878,6 @@ frame_info (char *addr_exp, int from_tty) get_frame_pc(). */ pc_regname = "pc"; - fi = parse_frame_specification (addr_exp); - if (fi == NULL) - error ("Invalid frame specified."); - find_frame_sal (fi, &sal); func = get_frame_function (fi); /* FIXME: cagney/2002-11-28: Why bother? Won't sal.symtab contain @@ -902,10 +923,10 @@ frame_info (char *addr_exp, int from_tty) } calling_frame_info = get_prev_frame (fi); - if (!addr_exp && frame_relative_level (deprecated_selected_frame) >= 0) + if (selected_frame_p && frame_relative_level (fi) >= 0) { printf_filtered ("Stack level %d, frame at ", - frame_relative_level (deprecated_selected_frame)); + frame_relative_level (fi)); print_address_numeric (get_frame_base (fi), 1, gdb_stdout); printf_filtered (":\n"); } @@ -1640,14 +1661,7 @@ find_relative_frame (struct frame_info *frame, void select_frame_command (char *level_exp, int from_tty) { - struct frame_info *frame; - - if (!target_has_stack) - error ("No stack."); - - frame = parse_frame_specification (level_exp); - - select_frame (frame); + select_frame (parse_frame_specification_1 (level_exp, "No stack.", NULL)); } /* The "frame" command. With no arg, print selected frame briefly. |