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gdb-msvc/gdb/tui/tui-stack.c

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Import GDB 9.2
2020-06-18 10:11:10 +02:00
/* TUI display locator.
Copyright (C) 1998-2020 Free Software Foundation, Inc.
Contributed by Hewlett-Packard Company.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "symtab.h"
#include "breakpoint.h"
#include "frame.h"
#include "command.h"
#include "inferior.h"
#include "target.h"
#include "top.h"
#include "gdb-demangle.h"
#include "source.h"
#include "tui/tui.h"
#include "tui/tui-data.h"
#include "tui/tui-stack.h"
#include "tui/tui-wingeneral.h"
#include "tui/tui-source.h"
#include "tui/tui-winsource.h"
#include "tui/tui-file.h"
#include "gdb_curses.h"
#define PROC_PREFIX "In: "
#define LINE_PREFIX "L"
#define PC_PREFIX "PC: "
/* Minimum/Maximum length of some fields displayed in the TUI status
line. */
#define MIN_LINE_WIDTH 4 /* Use at least 4 digits for line
numbers. */
#define MIN_PROC_WIDTH 12
#define MAX_TARGET_WIDTH 10
#define MAX_PID_WIDTH 19
static struct tui_locator_window _locator;
/* Accessor for the locator win info. Answers a pointer to the static
locator win info struct. */
struct tui_locator_window *
tui_locator_win_info_ptr (void)
{
return &_locator;
}
std::string
tui_locator_window::make_status_line () const
{
char line_buf[50];
int status_size;
int proc_width;
const char *pid_name;
int target_width;
int pid_width;
int line_width;
std::string pid_name_holder;
if (inferior_ptid == null_ptid)
pid_name = "No process";
else
{
pid_name_holder = target_pid_to_str (inferior_ptid);
pid_name = pid_name_holder.c_str ();
}
target_width = strlen (target_shortname);
if (target_width > MAX_TARGET_WIDTH)
target_width = MAX_TARGET_WIDTH;
pid_width = strlen (pid_name);
if (pid_width > MAX_PID_WIDTH)
pid_width = MAX_PID_WIDTH;
status_size = width;
/* Translate line number and obtain its size. */
if (line_no > 0)
xsnprintf (line_buf, sizeof (line_buf), "%d", line_no);
else
strcpy (line_buf, "??");
line_width = strlen (line_buf);
if (line_width < MIN_LINE_WIDTH)
line_width = MIN_LINE_WIDTH;
/* Translate PC address. */
std::string pc_out (gdbarch
? paddress (gdbarch, addr)
: "??");
const char *pc_buf = pc_out.c_str ();
int pc_width = pc_out.size ();
/* First determine the amount of proc name width we have available.
The +1 are for a space separator between fields.
The -1 are to take into account the \0 counted by sizeof. */
proc_width = (status_size
- (target_width + 1)
- (pid_width + 1)
- (sizeof (PROC_PREFIX) - 1 + 1)
- (sizeof (LINE_PREFIX) - 1 + line_width + 1)
- (sizeof (PC_PREFIX) - 1 + pc_width + 1)
- (tui_current_key_mode == TUI_SINGLE_KEY_MODE
? (sizeof (SINGLE_KEY) - 1 + 1)
: 0));
/* If there is no room to print the function name, try by removing
some fields. */
if (proc_width < MIN_PROC_WIDTH)
{
proc_width += target_width + 1;
target_width = 0;
if (proc_width < MIN_PROC_WIDTH)
{
proc_width += pid_width + 1;
pid_width = 0;
if (proc_width <= MIN_PROC_WIDTH)
{
proc_width += pc_width + sizeof (PC_PREFIX) - 1 + 1;
pc_width = 0;
if (proc_width < 0)
{
proc_width += line_width + sizeof (LINE_PREFIX) - 1 + 1;
line_width = 0;
if (proc_width < 0)
proc_width = 0;
}
}
}
}
/* Now create the locator line from the string version of the
elements. */
string_file string;
if (target_width > 0)
string.printf ("%*.*s ", -target_width, target_width, target_shortname);
if (pid_width > 0)
string.printf ("%*.*s ", -pid_width, pid_width, pid_name);
/* Show whether we are in SingleKey mode. */
if (tui_current_key_mode == TUI_SINGLE_KEY_MODE)
{
string.puts (SINGLE_KEY);
string.puts (" ");
}
/* Procedure/class name. */
if (proc_width > 0)
{
if (proc_name.size () > proc_width)
string.printf ("%s%*.*s* ", PROC_PREFIX,
1 - proc_width, proc_width - 1, proc_name.c_str ());
else
string.printf ("%s%*.*s ", PROC_PREFIX,
-proc_width, proc_width, proc_name.c_str ());
}
if (line_width > 0)
string.printf ("%s%*.*s ", LINE_PREFIX,
-line_width, line_width, line_buf);
if (pc_width > 0)
{
string.puts (PC_PREFIX);
string.puts (pc_buf);
}
if (string.size () < status_size)
string.puts (n_spaces (status_size - string.size ()));
else if (string.size () > status_size)
string.string ().erase (status_size, string.size ());
return std::move (string.string ());
}
/* Get a printable name for the function at the address. The symbol
name is demangled if demangling is turned on. Returns a pointer to
a static area holding the result. */
static char*
tui_get_function_from_frame (struct frame_info *fi)
{
static char name[256];
string_file stream;
print_address_symbolic (get_frame_arch (fi), get_frame_pc (fi),
&stream, demangle, "");
/* Use simple heuristics to isolate the function name. The symbol
can be demangled and we can have function parameters. Remove
them because the status line is too short to display them. */
const char *d = stream.c_str ();
if (*d == '<')
d++;
strncpy (name, d, sizeof (name) - 1);
name[sizeof (name) - 1] = 0;
char *p = strchr (name, '(');
if (!p)
p = strchr (name, '>');
if (p)
*p = 0;
p = strchr (name, '+');
if (p)
*p = 0;
return name;
}
void
tui_locator_window::rerender ()
{
if (handle != NULL)
{
std::string string = make_status_line ();
scrollok (handle.get (), FALSE);
wmove (handle.get (), 0, 0);
/* We ignore the return value from wstandout and wstandend, casting
them to void in order to avoid a compiler warning. The warning
itself was introduced by a patch to ncurses 5.7 dated 2009-08-29,
changing these macro to expand to code that causes the compiler
to generate an unused-value warning. */
(void) wstandout (handle.get ());
waddstr (handle.get (), string.c_str ());
wclrtoeol (handle.get ());
(void) wstandend (handle.get ());
refresh_window ();
wmove (handle.get (), 0, 0);
}
}
/* See tui-stack.h. */
void
tui_locator_window::set_locator_fullname (const char *fullname)
{
full_name = fullname;
rerender ();
}
/* See tui-stack.h. */
bool
tui_locator_window::set_locator_info (struct gdbarch *gdbarch_in,
const char *fullname,
const char *procname,
int lineno,
CORE_ADDR addr_in)
{
bool locator_changed_p = false;
if (procname == NULL)
procname = "";
if (fullname == NULL)
fullname = "";
locator_changed_p |= proc_name != procname;
locator_changed_p |= lineno != line_no;
locator_changed_p |= addr_in != addr;
locator_changed_p |= gdbarch_in != gdbarch;
locator_changed_p |= full_name != fullname;
proc_name = procname;
line_no = lineno;
addr = addr_in;
gdbarch = gdbarch_in;
set_locator_fullname (fullname);
return locator_changed_p;
}
/* Update only the full_name portion of the locator. */
void
tui_update_locator_fullname (const char *fullname)
{
struct tui_locator_window *locator = tui_locator_win_info_ptr ();
locator->set_locator_fullname (fullname);
}
/* Function to print the frame information for the TUI. The windows are
refreshed only if frame information has changed since the last refresh.
Return 1 if frame information has changed (and windows subsequently
refreshed), 0 otherwise. */
int
tui_show_frame_info (struct frame_info *fi)
{
bool locator_changed_p;
struct tui_locator_window *locator = tui_locator_win_info_ptr ();
if (fi)
{
CORE_ADDR pc;
symtab_and_line sal = find_frame_sal (fi);
const char *fullname = nullptr;
if (sal.symtab != nullptr)
fullname = symtab_to_fullname (sal.symtab);
if (get_frame_pc_if_available (fi, &pc))
locator_changed_p
= locator->set_locator_info (get_frame_arch (fi),
(sal.symtab == 0
? "??" : fullname),
tui_get_function_from_frame (fi),
sal.line,
pc);
else
locator_changed_p
= locator->set_locator_info (get_frame_arch (fi),
"??", _("<unavailable>"), sal.line, 0);
/* If the locator information has not changed, then frame information has
not changed. If frame information has not changed, then the windows'
contents will not change. So don't bother refreshing the windows. */
if (!locator_changed_p)
return 0;
for (struct tui_source_window_base *win_info : tui_source_windows ())
{
win_info->maybe_update (fi, sal, locator->line_no, locator->addr);
win_info->update_exec_info ();
}
return 1;
}
else
{
locator_changed_p
= locator->set_locator_info (NULL, NULL, NULL, 0, (CORE_ADDR) 0);
if (!locator_changed_p)
return 0;
for (struct tui_source_window_base *win_info : tui_source_windows ())
{
win_info->erase_source_content ();
win_info->update_exec_info ();
}
return 1;
}
}
void
tui_show_locator_content ()
{
struct tui_locator_window *locator = tui_locator_win_info_ptr ();
locator->rerender ();
}
/* Command to update the display with the current execution point. */
static void
tui_update_command (const char *arg, int from_tty)
{
execute_command ("frame 0", from_tty);
}
/* Function to initialize gdb commands, for tui window stack
manipulation. */
void
_initialize_tui_stack (void)
{
add_com ("update", class_tui, tui_update_command,
_("Update the source window and locator to "
"display the current execution point."));
}