| File: | src/gnu/usr.bin/binutils/gdb/tui/tui-disasm.c |
| Warning: | line 202, column 3 Value stored to 'line_width' is never read |
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| 1 | /* Disassembly display. |
| 2 | |
| 3 | Copyright 1998, 1999, 2000, 2001, 2002, 2003, 2004 Free Software |
| 4 | Foundation, Inc. |
| 5 | |
| 6 | Contributed by Hewlett-Packard Company. |
| 7 | |
| 8 | This file is part of GDB. |
| 9 | |
| 10 | This program is free software; you can redistribute it and/or modify |
| 11 | it under the terms of the GNU General Public License as published by |
| 12 | the Free Software Foundation; either version 2 of the License, or |
| 13 | (at your option) any later version. |
| 14 | |
| 15 | This program is distributed in the hope that it will be useful, |
| 16 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | GNU General Public License for more details. |
| 19 | |
| 20 | You should have received a copy of the GNU General Public License |
| 21 | along with this program; if not, write to the Free Software |
| 22 | Foundation, Inc., 59 Temple Place - Suite 330, |
| 23 | Boston, MA 02111-1307, USA. */ |
| 24 | |
| 25 | #include "defs.h" |
| 26 | #include "symtab.h" |
| 27 | #include "breakpoint.h" |
| 28 | #include "frame.h" |
| 29 | #include "value.h" |
| 30 | #include "source.h" |
| 31 | #include "disasm.h" |
| 32 | #include "gdb_string.h" |
| 33 | #include "tui/tui.h" |
| 34 | #include "tui/tui-data.h" |
| 35 | #include "tui/tui-win.h" |
| 36 | #include "tui/tui-layout.h" |
| 37 | #include "tui/tui-winsource.h" |
| 38 | #include "tui/tui-stack.h" |
| 39 | #include "tui/tui-file.h" |
| 40 | |
| 41 | #include "gdb_curses.h" |
| 42 | |
| 43 | struct tui_asm_line |
| 44 | { |
| 45 | CORE_ADDR addr; |
| 46 | char* addr_string; |
| 47 | char* insn; |
| 48 | }; |
| 49 | |
| 50 | /* Function to set the disassembly window's content. |
| 51 | Disassemble count lines starting at pc. |
| 52 | Return address of the count'th instruction after pc. */ |
| 53 | static CORE_ADDR |
| 54 | tui_disassemble (struct tui_asm_line* asm_lines, CORE_ADDR pc, int count) |
| 55 | { |
| 56 | struct ui_file *gdb_dis_out; |
| 57 | |
| 58 | /* now init the ui_file structure */ |
| 59 | gdb_dis_out = tui_sfileopen (256); |
| 60 | |
| 61 | /* Now construct each line */ |
| 62 | for (; count > 0; count--, asm_lines++) |
| 63 | { |
| 64 | if (asm_lines->addr_string) |
| 65 | xfree (asm_lines->addr_string); |
| 66 | if (asm_lines->insn) |
| 67 | xfree (asm_lines->insn); |
| 68 | |
| 69 | print_address (pc, gdb_dis_out); |
| 70 | asm_lines->addr = pc; |
| 71 | asm_lines->addr_string = xstrdup (tui_file_get_strbuf (gdb_dis_out)); |
| 72 | |
| 73 | ui_file_rewind (gdb_dis_out); |
| 74 | |
| 75 | pc = pc + gdb_print_insn (pc, gdb_dis_out); |
| 76 | |
| 77 | asm_lines->insn = xstrdup (tui_file_get_strbuf (gdb_dis_out)); |
| 78 | |
| 79 | /* reset the buffer to empty */ |
| 80 | ui_file_rewind (gdb_dis_out); |
| 81 | } |
| 82 | ui_file_delete (gdb_dis_out); |
| 83 | return pc; |
| 84 | } |
| 85 | |
| 86 | /* Find the disassembly address that corresponds to FROM lines |
| 87 | above or below the PC. Variable sized instructions are taken |
| 88 | into account by the algorithm. */ |
| 89 | static CORE_ADDR |
| 90 | tui_find_disassembly_address (CORE_ADDR pc, int from) |
| 91 | { |
| 92 | CORE_ADDR new_low; |
| 93 | int max_lines; |
| 94 | int i; |
| 95 | struct tui_asm_line* asm_lines; |
| 96 | |
| 97 | max_lines = (from > 0) ? from : - from; |
| 98 | if (max_lines <= 1) |
| 99 | return pc; |
| 100 | |
| 101 | asm_lines = (struct tui_asm_line*) alloca (sizeof (struct tui_asm_line)__builtin_alloca(sizeof (struct tui_asm_line) * max_lines) |
| 102 | * max_lines)__builtin_alloca(sizeof (struct tui_asm_line) * max_lines); |
| 103 | memset (asm_lines, 0, sizeof (struct tui_asm_line) * max_lines); |
| 104 | |
| 105 | new_low = pc; |
| 106 | if (from > 0) |
| 107 | { |
| 108 | tui_disassemble (asm_lines, pc, max_lines); |
| 109 | new_low = asm_lines[max_lines - 1].addr; |
| 110 | } |
| 111 | else |
| 112 | { |
| 113 | CORE_ADDR last_addr; |
| 114 | int pos; |
| 115 | struct minimal_symbol* msymbol; |
| 116 | |
| 117 | /* Find backward an address which is a symbol |
| 118 | and for which disassembling from that address will fill |
| 119 | completely the window. */ |
| 120 | pos = max_lines - 1; |
| 121 | do { |
| 122 | new_low -= 1 * max_lines; |
| 123 | msymbol = lookup_minimal_symbol_by_pc_section (new_low, 0); |
| 124 | |
| 125 | if (msymbol) |
| 126 | new_low = SYMBOL_VALUE_ADDRESS (msymbol)(msymbol)->ginfo.value.address; |
| 127 | else |
| 128 | new_low += 1 * max_lines; |
| 129 | |
| 130 | tui_disassemble (asm_lines, new_low, max_lines); |
| 131 | last_addr = asm_lines[pos].addr; |
| 132 | } while (last_addr > pc && msymbol); |
| 133 | |
| 134 | /* Scan forward disassembling one instruction at a time |
| 135 | until the last visible instruction of the window |
| 136 | matches the pc. We keep the disassembled instructions |
| 137 | in the 'lines' window and shift it downward (increasing |
| 138 | its addresses). */ |
| 139 | if (last_addr < pc) |
| 140 | do |
| 141 | { |
| 142 | CORE_ADDR next_addr; |
| 143 | |
| 144 | pos++; |
| 145 | if (pos >= max_lines) |
| 146 | pos = 0; |
| 147 | |
| 148 | next_addr = tui_disassemble (&asm_lines[pos], last_addr, 1); |
| 149 | |
| 150 | /* If there are some problems while disassembling exit. */ |
| 151 | if (next_addr <= last_addr) |
| 152 | break; |
| 153 | last_addr = next_addr; |
| 154 | } while (last_addr <= pc); |
| 155 | pos++; |
| 156 | if (pos >= max_lines) |
| 157 | pos = 0; |
| 158 | new_low = asm_lines[pos].addr; |
| 159 | } |
| 160 | for (i = 0; i < max_lines; i++) |
| 161 | { |
| 162 | xfree (asm_lines[i].addr_string); |
| 163 | xfree (asm_lines[i].insn); |
| 164 | } |
| 165 | return new_low; |
| 166 | } |
| 167 | |
| 168 | /* Function to set the disassembly window's content. */ |
| 169 | enum tui_status |
| 170 | tui_set_disassem_content (CORE_ADDR pc) |
| 171 | { |
| 172 | enum tui_status ret = TUI_FAILURE; |
| 173 | int i; |
| 174 | int offset = TUI_DISASM_WINtui_win_list[DISASSEM_WIN]->detail.source_info.horizontal_offset; |
| 175 | int line_width, max_lines; |
| 176 | CORE_ADDR cur_pc; |
| 177 | struct tui_gen_win_info * locator = tui_locator_win_info_ptr (); |
| 178 | int tab_len = tui_default_tab_len (); |
| 179 | struct tui_asm_line* asm_lines; |
| 180 | int insn_pos; |
| 181 | int addr_size, max_size; |
| 182 | char* line; |
| 183 | |
| 184 | if (pc == 0) |
| 185 | return TUI_FAILURE; |
| 186 | |
| 187 | ret = tui_alloc_source_buffer (TUI_DISASM_WINtui_win_list[DISASSEM_WIN]); |
| 188 | if (ret != TUI_SUCCESS) |
| 189 | return ret; |
| 190 | |
| 191 | TUI_DISASM_WINtui_win_list[DISASSEM_WIN]->detail.source_info.start_line_or_addr.addr = pc; |
| 192 | cur_pc = (CORE_ADDR) |
| 193 | (((struct tui_win_element *) locator->content[0])->which_element.locator.addr); |
| 194 | |
| 195 | max_lines = TUI_DISASM_WINtui_win_list[DISASSEM_WIN]->generic.height - 2; /* account for hilite */ |
| 196 | |
| 197 | /* Get temporary table that will hold all strings (addr & insn). */ |
| 198 | asm_lines = (struct tui_asm_line*) alloca (sizeof (struct tui_asm_line)__builtin_alloca(sizeof (struct tui_asm_line) * max_lines) |
| 199 | * max_lines)__builtin_alloca(sizeof (struct tui_asm_line) * max_lines); |
| 200 | memset (asm_lines, 0, sizeof (struct tui_asm_line) * max_lines); |
| 201 | |
| 202 | line_width = TUI_DISASM_WINtui_win_list[DISASSEM_WIN]->generic.width - 1; |
Value stored to 'line_width' is never read | |
| 203 | |
| 204 | tui_disassemble (asm_lines, pc, max_lines); |
| 205 | |
| 206 | /* See what is the maximum length of an address and of a line. */ |
| 207 | addr_size = 0; |
| 208 | max_size = 0; |
| 209 | for (i = 0; i < max_lines; i++) |
| 210 | { |
| 211 | size_t len = strlen (asm_lines[i].addr_string); |
| 212 | if (len > addr_size) |
| 213 | addr_size = len; |
| 214 | |
| 215 | len = strlen (asm_lines[i].insn) + tab_len; |
| 216 | if (len > max_size) |
| 217 | max_size = len; |
| 218 | } |
| 219 | max_size += addr_size + tab_len; |
| 220 | |
| 221 | /* Allocate memory to create each line. */ |
| 222 | line = (char*) alloca (max_size)__builtin_alloca(max_size); |
| 223 | insn_pos = (1 + (addr_size / tab_len)) * tab_len; |
| 224 | |
| 225 | /* Now construct each line */ |
| 226 | for (i = 0; i < max_lines; i++) |
| 227 | { |
| 228 | struct tui_win_element * element; |
| 229 | struct tui_source_element* src; |
| 230 | int cur_len; |
| 231 | |
| 232 | element = (struct tui_win_element *) TUI_DISASM_WINtui_win_list[DISASSEM_WIN]->generic.content[i]; |
| 233 | src = &element->which_element.source; |
| 234 | strcpy (line, asm_lines[i].addr_string); |
| 235 | cur_len = strlen (line); |
| 236 | |
| 237 | /* Add spaces to make the instructions start on the same column */ |
| 238 | while (cur_len < insn_pos) |
| 239 | { |
| 240 | strcat (line, " "); |
| 241 | cur_len++; |
| 242 | } |
| 243 | |
| 244 | strcat (line, asm_lines[i].insn); |
| 245 | |
| 246 | /* Now copy the line taking the offset into account */ |
| 247 | if (strlen (line) > offset) |
| 248 | strcpy (src->line, &line[offset]); |
| 249 | else |
| 250 | src->line[0] = '\0'; |
| 251 | |
| 252 | src->line_or_addr.addr = asm_lines[i].addr; |
| 253 | src->is_exec_point = asm_lines[i].addr == cur_pc; |
| 254 | |
| 255 | /* See whether there is a breakpoint installed. */ |
| 256 | src->has_break = (!src->is_exec_point |
| 257 | && breakpoint_here_p (pc) != no_breakpoint_here); |
| 258 | |
| 259 | xfree (asm_lines[i].addr_string); |
| 260 | xfree (asm_lines[i].insn); |
| 261 | } |
| 262 | TUI_DISASM_WINtui_win_list[DISASSEM_WIN]->generic.content_size = i; |
| 263 | return TUI_SUCCESS; |
| 264 | } |
| 265 | |
| 266 | |
| 267 | /* Function to display the disassembly window with disassembled code. */ |
| 268 | void |
| 269 | tui_show_disassem (CORE_ADDR start_addr) |
| 270 | { |
| 271 | struct symtab *s = find_pc_symtab (start_addr); |
| 272 | struct tui_win_info * win_with_focus = tui_win_with_focus (); |
| 273 | union tui_line_or_address val; |
| 274 | |
| 275 | val.addr = start_addr; |
| 276 | tui_add_win_to_layout (DISASSEM_WIN); |
| 277 | tui_update_source_window (TUI_DISASM_WINtui_win_list[DISASSEM_WIN], s, val, FALSE0); |
| 278 | /* |
| 279 | ** if the focus was in the src win, put it in the asm win, if the |
| 280 | ** source view isn't split |
| 281 | */ |
| 282 | if (tui_current_layout () != SRC_DISASSEM_COMMAND && win_with_focus == TUI_SRC_WINtui_win_list[SRC_WIN]) |
| 283 | tui_set_win_focus_to (TUI_DISASM_WINtui_win_list[DISASSEM_WIN]); |
| 284 | |
| 285 | return; |
| 286 | } |
| 287 | |
| 288 | |
| 289 | /* Function to display the disassembly window. */ |
| 290 | void |
| 291 | tui_show_disassem_and_update_source (CORE_ADDR start_addr) |
| 292 | { |
| 293 | struct symtab_and_line sal; |
| 294 | |
| 295 | tui_show_disassem (start_addr); |
| 296 | if (tui_current_layout () == SRC_DISASSEM_COMMAND) |
| 297 | { |
| 298 | union tui_line_or_address val; |
| 299 | |
| 300 | /* |
| 301 | ** Update what is in the source window if it is displayed too, |
| 302 | ** note that it follows what is in the disassembly window and visa-versa |
| 303 | */ |
| 304 | sal = find_pc_line (start_addr, 0); |
| 305 | val.line_no = sal.line; |
| 306 | tui_update_source_window (TUI_SRC_WINtui_win_list[SRC_WIN], sal.symtab, val, TRUE1); |
| 307 | if (sal.symtab) |
| 308 | { |
| 309 | set_current_source_symtab_and_line (&sal); |
| 310 | tui_update_locator_filename (sal.symtab->filename); |
| 311 | } |
| 312 | else |
| 313 | tui_update_locator_filename ("?"); |
| 314 | } |
| 315 | |
| 316 | return; |
| 317 | } |
| 318 | |
| 319 | CORE_ADDR |
| 320 | tui_get_begin_asm_address (void) |
| 321 | { |
| 322 | struct tui_gen_win_info * locator; |
| 323 | struct tui_locator_element * element; |
| 324 | CORE_ADDR addr; |
| 325 | |
| 326 | locator = tui_locator_win_info_ptr (); |
| 327 | element = &((struct tui_win_element *) locator->content[0])->which_element.locator; |
| 328 | |
| 329 | if (element->addr == 0) |
| 330 | { |
| 331 | struct minimal_symbol *main_symbol; |
| 332 | |
| 333 | /* Find address of the start of program. |
| 334 | Note: this should be language specific. */ |
| 335 | main_symbol = lookup_minimal_symbol ("main", NULL((void*)0), NULL((void*)0)); |
| 336 | if (main_symbol == 0) |
| 337 | main_symbol = lookup_minimal_symbol ("MAIN", NULL((void*)0), NULL((void*)0)); |
| 338 | if (main_symbol == 0) |
| 339 | main_symbol = lookup_minimal_symbol ("_start", NULL((void*)0), NULL((void*)0)); |
| 340 | if (main_symbol) |
| 341 | addr = SYMBOL_VALUE_ADDRESS (main_symbol)(main_symbol)->ginfo.value.address; |
| 342 | else |
| 343 | addr = 0; |
| 344 | } |
| 345 | else /* the target is executing */ |
| 346 | addr = element->addr; |
| 347 | |
| 348 | return addr; |
| 349 | } |
| 350 | |
| 351 | /* Determine what the low address will be to display in the TUI's |
| 352 | disassembly window. This may or may not be the same as the |
| 353 | low address input. */ |
| 354 | CORE_ADDR |
| 355 | tui_get_low_disassembly_address (CORE_ADDR low, CORE_ADDR pc) |
| 356 | { |
| 357 | int pos; |
| 358 | |
| 359 | /* Determine where to start the disassembly so that the pc is about in the |
| 360 | middle of the viewport. */ |
| 361 | pos = tui_default_win_viewport_height (DISASSEM_WIN, DISASSEM_COMMAND) / 2; |
| 362 | pc = tui_find_disassembly_address (pc, -pos); |
| 363 | |
| 364 | if (pc < low) |
| 365 | pc = low; |
| 366 | return pc; |
| 367 | } |
| 368 | |
| 369 | /* Scroll the disassembly forward or backward vertically. */ |
| 370 | void |
| 371 | tui_vertical_disassem_scroll (enum tui_scroll_direction scroll_direction, |
| 372 | int num_to_scroll) |
| 373 | { |
| 374 | if (TUI_DISASM_WINtui_win_list[DISASSEM_WIN]->generic.content != NULL((void*)0)) |
| 375 | { |
| 376 | CORE_ADDR pc; |
| 377 | tui_win_content content; |
| 378 | struct symtab *s; |
| 379 | union tui_line_or_address val; |
| 380 | int max_lines, dir; |
| 381 | struct symtab_and_line cursal = get_current_source_symtab_and_line (); |
| 382 | |
| 383 | content = (tui_win_content) TUI_DISASM_WINtui_win_list[DISASSEM_WIN]->generic.content; |
| 384 | if (cursal.symtab == (struct symtab *) NULL((void*)0)) |
| 385 | s = find_pc_symtab (get_frame_pc (deprecated_selected_frame)); |
| 386 | else |
| 387 | s = cursal.symtab; |
| 388 | |
| 389 | /* account for hilite */ |
| 390 | max_lines = TUI_DISASM_WINtui_win_list[DISASSEM_WIN]->generic.height - 2; |
| 391 | pc = content[0]->which_element.source.line_or_addr.addr; |
| 392 | dir = (scroll_direction == FORWARD_SCROLL) ? max_lines : - max_lines; |
| 393 | |
| 394 | val.addr = tui_find_disassembly_address (pc, dir); |
| 395 | tui_update_source_window_as_is (TUI_DISASM_WINtui_win_list[DISASSEM_WIN], s, val, FALSE0); |
| 396 | } |
| 397 | } |