/* TUI display registers in window. Copyright (C) 1998-2022 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 . */ #include "defs.h" #include "arch-utils.h" #include "tui/tui.h" #include "tui/tui-data.h" #include "symtab.h" #include "gdbtypes.h" #include "gdbcmd.h" #include "frame.h" #include "regcache.h" #include "inferior.h" #include "target.h" #include "tui/tui-layout.h" #include "tui/tui-win.h" #include "tui/tui-wingeneral.h" #include "tui/tui-file.h" #include "tui/tui-regs.h" #include "tui/tui-io.h" #include "reggroups.h" #include "valprint.h" #include "completer.h" #include "gdb_curses.h" /* A subclass of string_file that expands tab characters. */ class tab_expansion_file : public string_file { public: tab_expansion_file () = default; void write (const char *buf, long length_buf) override; private: int m_column = 0; }; void tab_expansion_file::write (const char *buf, long length_buf) { for (long i = 0; i < length_buf; ++i) { if (buf[i] == '\t') { do { string_file::write (" ", 1); ++m_column; } while ((m_column % 8) != 0); } else { string_file::write (&buf[i], 1); if (buf[i] == '\n') m_column = 0; else ++m_column; } } } /* Get the register from the frame and return a printable representation of it. */ static std::string tui_register_format (frame_info_ptr frame, int regnum) { struct gdbarch *gdbarch = get_frame_arch (frame); /* Expand tabs into spaces, since ncurses on MS-Windows doesn't. */ tab_expansion_file stream; scoped_restore save_pagination = make_scoped_restore (&pagination_enabled, 0); scoped_restore save_stdout = make_scoped_restore (&gdb_stdout, &stream); gdbarch_print_registers_info (gdbarch, &stream, frame, regnum, 1); /* Remove the possible \n. */ std::string str = stream.release (); if (!str.empty () && str.back () == '\n') str.resize (str.size () - 1); return str; } /* Get the register value from the given frame and format it for the display. When changep is set, check if the new register value has changed with respect to the previous call. */ static void tui_get_register (frame_info_ptr frame, struct tui_data_item_window *data, int regnum, bool *changedp) { if (changedp) *changedp = false; if (target_has_registers ()) { std::string new_content = tui_register_format (frame, regnum); if (changedp != NULL && data->content != new_content) *changedp = true; data->content = std::move (new_content); } } /* See tui-regs.h. */ int tui_data_window::last_regs_line_no () const { int num_lines = m_regs_content.size () / m_regs_column_count; if (m_regs_content.size () % m_regs_column_count) num_lines++; return num_lines; } /* See tui-regs.h. */ int tui_data_window::line_from_reg_element_no (int element_no) const { if (element_no < m_regs_content.size ()) { int i, line = (-1); i = 1; while (line == (-1)) { if (element_no < m_regs_column_count * i) line = i - 1; else i++; } return line; } else return (-1); } /* See tui-regs.h. */ int tui_data_window::first_reg_element_no_inline (int line_no) const { if (line_no * m_regs_column_count <= m_regs_content.size ()) return ((line_no + 1) * m_regs_column_count) - m_regs_column_count; else return (-1); } /* Show the registers of the given group in the data window and refresh the window. */ void tui_data_window::show_registers (const reggroup *group) { if (group == 0) group = general_reggroup; if (target_has_registers () && target_has_stack () && target_has_memory ()) { show_register_group (group, get_selected_frame (NULL), group == m_current_group); /* Clear all notation of changed values. */ for (auto &&data_item_win : m_regs_content) data_item_win.highlight = false; m_current_group = group; } else { m_current_group = 0; m_regs_content.clear (); } rerender (); } /* Set the data window to display the registers of the register group using the given frame. Values are refreshed only when refresh_values_only is true. */ void tui_data_window::show_register_group (const reggroup *group, frame_info_ptr frame, bool refresh_values_only) { struct gdbarch *gdbarch = get_frame_arch (frame); int nr_regs; int regnum, pos; /* Make a new title showing which group we display. */ title = string_printf ("Register group: %s", group->name ()); /* See how many registers must be displayed. */ nr_regs = 0; for (regnum = 0; regnum < gdbarch_num_cooked_regs (gdbarch); regnum++) { const char *name; /* Must be in the group. */ if (!gdbarch_register_reggroup_p (gdbarch, regnum, group)) continue; /* If the register name is empty, it is undefined for this processor, so don't display anything. */ name = gdbarch_register_name (gdbarch, regnum); if (*name == '\0') continue; nr_regs++; } m_regs_content.resize (nr_regs); /* Now set the register names and values. */ pos = 0; for (regnum = 0; regnum < gdbarch_num_cooked_regs (gdbarch); regnum++) { struct tui_data_item_window *data_item_win; const char *name; /* Must be in the group. */ if (!gdbarch_register_reggroup_p (gdbarch, regnum, group)) continue; /* If the register name is empty, it is undefined for this processor, so don't display anything. */ name = gdbarch_register_name (gdbarch, regnum); if (*name == '\0') continue; data_item_win = &m_regs_content[pos]; if (!refresh_values_only) { data_item_win->regno = regnum; data_item_win->highlight = false; } tui_get_register (frame, data_item_win, regnum, 0); pos++; } } /* See tui-regs.h. */ void tui_data_window::display_registers_from (int start_element_no) { int max_len = 0; for (auto &&data_item_win : m_regs_content) { int len = data_item_win.content.size (); if (len > max_len) max_len = len; } m_item_width = max_len + 1; int i; /* Mark register windows above the visible area. */ for (i = 0; i < start_element_no; i++) m_regs_content[i].y = 0; m_regs_column_count = (width - 2) / m_item_width; if (m_regs_column_count == 0) m_regs_column_count = 1; m_item_width = (width - 2) / m_regs_column_count; /* Now create each data "sub" window, and write the display into it. */ int cur_y = 1; while (i < m_regs_content.size () && cur_y <= height - 2) { for (int j = 0; j < m_regs_column_count && i < m_regs_content.size (); j++) { /* Create the window if necessary. */ m_regs_content[i].x = (m_item_width * j) + 1; m_regs_content[i].y = cur_y; m_regs_content[i].visible = true; m_regs_content[i].rerender (handle.get (), m_item_width); i++; /* Next register. */ } cur_y++; /* Next row. */ } /* Mark register windows below the visible area. */ for (; i < m_regs_content.size (); i++) m_regs_content[i].y = 0; refresh_window (); } /* See tui-regs.h. */ void tui_data_window::display_reg_element_at_line (int start_element_no, int start_line_no) { int element_no = start_element_no; if (start_element_no != 0 && start_line_no != 0) { int last_line_no, first_line_on_last_page; last_line_no = last_regs_line_no (); first_line_on_last_page = last_line_no - (height - 2); if (first_line_on_last_page < 0) first_line_on_last_page = 0; /* If the element_no causes us to scroll past the end of the registers, adjust what element to really start the display at. */ if (start_line_no > first_line_on_last_page) element_no = first_reg_element_no_inline (first_line_on_last_page); } display_registers_from (element_no); } /* See tui-regs.h. */ int tui_data_window::display_registers_from_line (int line_no) { int element_no; if (line_no < 0) line_no = 0; else { /* Make sure that we don't display off the end of the registers. */ if (line_no >= last_regs_line_no ()) { line_no = line_from_reg_element_no (m_regs_content.size () - 1); if (line_no < 0) line_no = 0; } } element_no = first_reg_element_no_inline (line_no); if (element_no < m_regs_content.size ()) display_reg_element_at_line (element_no, line_no); else line_no = (-1); return line_no; } /* Answer the index first element displayed. If none are displayed, then return (-1). */ int tui_data_window::first_data_item_displayed () { for (int i = 0; i < m_regs_content.size (); i++) { if (m_regs_content[i].visible) return i; } return -1; } /* See tui-regs.h. */ void tui_data_window::delete_data_content_windows () { for (auto &win : m_regs_content) win.visible = false; } void tui_data_window::erase_data_content (const char *prompt) { werase (handle.get ()); check_and_display_highlight_if_needed (); if (prompt != NULL) { int half_width = (width - 2) / 2; int x_pos; if (strlen (prompt) >= half_width) x_pos = 1; else x_pos = half_width - strlen (prompt); mvwaddstr (handle.get (), (height / 2), x_pos, (char *) prompt); } tui_wrefresh (handle.get ()); } /* See tui-regs.h. */ void tui_data_window::rerender () { if (m_regs_content.empty ()) erase_data_content (_("[ Register Values Unavailable ]")); else { erase_data_content (NULL); delete_data_content_windows (); display_registers_from (0); } } /* Scroll the data window vertically forward or backward. */ void tui_data_window::do_scroll_vertical (int num_to_scroll) { int first_element_no; int first_line = (-1); first_element_no = first_data_item_displayed (); if (first_element_no < m_regs_content.size ()) first_line = line_from_reg_element_no (first_element_no); else { /* Calculate the first line from the element number which is in the general data content. */ } if (first_line >= 0) { first_line += num_to_scroll; erase_data_content (NULL); delete_data_content_windows (); display_registers_from_line (first_line); } } /* This function check all displayed registers for changes in values, given a particular frame. If the values have changed, they are updated with the new value and highlighted. */ void tui_data_window::check_register_values (frame_info_ptr frame) { if (m_regs_content.empty ()) show_registers (m_current_group); else { for (auto &&data_item_win : m_regs_content) { int was_hilighted; was_hilighted = data_item_win.highlight; tui_get_register (frame, &data_item_win, data_item_win.regno, &data_item_win.highlight); /* Register windows whose y == 0 are outside the visible area. */ if ((data_item_win.highlight || was_hilighted) && data_item_win.y > 0) data_item_win.rerender (handle.get (), m_item_width); } } tui_wrefresh (handle.get ()); } /* Display a register in a window. If hilite is TRUE, then the value will be displayed in reverse video. */ void tui_data_item_window::rerender (WINDOW *handle, int field_width) { if (highlight) /* We ignore the return value, casting it 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 this macro to expand to code that causes the compiler to generate an unused-value warning. */ (void) wstandout (handle); mvwaddnstr (handle, y, x, content.c_str (), field_width - 1); if (content.size () < field_width) waddstr (handle, n_spaces (field_width - content.size ())); if (highlight) /* We ignore the return value, casting it 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 this macro to expand to code that causes the compiler to generate an unused-value warning. */ (void) wstandend (handle); } /* Helper for "tui reg next", returns the next register group after CURRENT_GROUP in the register group list for GDBARCH, with wrap around behaviour. If CURRENT_GROUP is nullptr (e.g. if the tui register window has only just been displayed and has no current group selected) or the currently selected register group can't be found (e.g. if the architecture has changed since the register window was last updated), then the first register group will be returned. */ static const reggroup * tui_reg_next (const reggroup *current_group, struct gdbarch *gdbarch) { const std::vector &groups = gdbarch_reggroups (gdbarch); auto it = std::find (groups.begin (), groups.end (), current_group); if (it != groups.end ()) it++; if (it == groups.end ()) return groups.front (); return *it; } /* Helper for "tui reg prev", returns the register group previous to CURRENT_GROUP in the register group list for GDBARCH, with wrap around behaviour. If CURRENT_GROUP is nullptr (e.g. if the tui register window has only just been displayed and has no current group selected) or the currently selected register group can't be found (e.g. if the architecture has changed since the register window was last updated), then the last register group will be returned. */ static const reggroup * tui_reg_prev (const reggroup *current_group, struct gdbarch *gdbarch) { const std::vector &groups = gdbarch_reggroups (gdbarch); auto it = std::find (groups.rbegin (), groups.rend (), current_group); if (it != groups.rend ()) it++; if (it == groups.rend ()) return groups.back (); return *it; } /* Implement the 'tui reg' command. Changes the register group displayed in the tui register window. Displays the tui register window if it is not already on display. */ static void tui_reg_command (const char *args, int from_tty) { struct gdbarch *gdbarch = get_current_arch (); if (args != NULL) { size_t len = strlen (args); /* Make sure the curses mode is enabled. */ tui_enable (); tui_suppress_output suppress; /* Make sure the register window is visible. If not, select an appropriate layout. We need to do this before trying to run the 'next' or 'prev' commands. */ if (TUI_DATA_WIN == NULL || !TUI_DATA_WIN->is_visible ()) tui_regs_layout (); const reggroup *match = nullptr; const reggroup *current_group = TUI_DATA_WIN->get_current_group (); if (strncmp (args, "next", len) == 0) match = tui_reg_next (current_group, gdbarch); else if (strncmp (args, "prev", len) == 0) match = tui_reg_prev (current_group, gdbarch); else { /* This loop matches on the initial part of a register group name. If this initial part in ARGS matches only one register group then the switch is made. */ for (const struct reggroup *group : gdbarch_reggroups (gdbarch)) { if (strncmp (group->name (), args, len) == 0) { if (match != NULL) error (_("ambiguous register group name '%s'"), args); match = group; } } } if (match == NULL) error (_("unknown register group '%s'"), args); TUI_DATA_WIN->show_registers (match); } else { gdb_printf (_("\"tui reg\" must be followed by the name of " "either a register group,\nor one of 'next' " "or 'prev'. Known register groups are:\n")); bool first = true; for (const struct reggroup *group : gdbarch_reggroups (gdbarch)) { if (!first) gdb_printf (", "); first = false; gdb_printf ("%s", group->name ()); } gdb_printf ("\n"); } } /* Complete names of register groups, and add the special "prev" and "next" names. */ static void tui_reggroup_completer (struct cmd_list_element *ignore, completion_tracker &tracker, const char *text, const char *word) { static const char * const extra[] = { "next", "prev", NULL }; reggroup_completer (ignore, tracker, text, word); complete_on_enum (tracker, extra, text, word); } void _initialize_tui_regs (); void _initialize_tui_regs () { struct cmd_list_element **tuicmd, *cmd; tuicmd = tui_get_cmd_list (); cmd = add_cmd ("reg", class_tui, tui_reg_command, _("\ TUI command to control the register window.\n\ Usage: tui reg NAME\n\ NAME is the name of the register group to display"), tuicmd); set_cmd_completer (cmd, tui_reggroup_completer); }