| File: | src/gnu/usr.bin/binutils/gdb/disasm.c |
| Warning: | line 308, column 3 Value stored to 'num_displayed' is never read |
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| 1 | /* Disassemble support for GDB. |
| 2 | |
| 3 | Copyright 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 2 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program; if not, write to the Free Software |
| 19 | Foundation, Inc., 59 Temple Place - Suite 330, |
| 20 | Boston, MA 02111-1307, USA. */ |
| 21 | |
| 22 | #include "defs.h" |
| 23 | #include "target.h" |
| 24 | #include "value.h" |
| 25 | #include "ui-out.h" |
| 26 | #include "gdb_string.h" |
| 27 | #include "disasm.h" |
| 28 | #include "gdbcore.h" |
| 29 | #include "dis-asm.h" |
| 30 | |
| 31 | /* Disassemble functions. |
| 32 | FIXME: We should get rid of all the duplicate code in gdb that does |
| 33 | the same thing: disassemble_command() and the gdbtk variation. */ |
| 34 | |
| 35 | /* This Structure is used to store line number information. |
| 36 | We need a different sort of line table from the normal one cuz we can't |
| 37 | depend upon implicit line-end pc's for lines to do the |
| 38 | reordering in this function. */ |
| 39 | |
| 40 | struct dis_line_entry |
| 41 | { |
| 42 | int line; |
| 43 | CORE_ADDR start_pc; |
| 44 | CORE_ADDR end_pc; |
| 45 | }; |
| 46 | |
| 47 | /* Like target_read_memory, but slightly different parameters. */ |
| 48 | static int |
| 49 | dis_asm_read_memory (bfd_vma memaddr, bfd_byte *myaddr, unsigned int len, |
| 50 | struct disassemble_info *info) |
| 51 | { |
| 52 | return target_read_memory (memaddr, (char *) myaddr, len); |
| 53 | } |
| 54 | |
| 55 | /* Like memory_error with slightly different parameters. */ |
| 56 | static void |
| 57 | dis_asm_memory_error (int status, bfd_vma memaddr, |
| 58 | struct disassemble_info *info) |
| 59 | { |
| 60 | memory_error (status, memaddr); |
| 61 | } |
| 62 | |
| 63 | /* Like print_address with slightly different parameters. */ |
| 64 | static void |
| 65 | dis_asm_print_address (bfd_vma addr, struct disassemble_info *info) |
| 66 | { |
| 67 | print_address (addr, info->stream); |
| 68 | } |
| 69 | |
| 70 | static int |
| 71 | compare_lines (const void *mle1p, const void *mle2p) |
| 72 | { |
| 73 | struct dis_line_entry *mle1, *mle2; |
| 74 | int val; |
| 75 | |
| 76 | mle1 = (struct dis_line_entry *) mle1p; |
| 77 | mle2 = (struct dis_line_entry *) mle2p; |
| 78 | |
| 79 | val = mle1->line - mle2->line; |
| 80 | |
| 81 | if (val != 0) |
| 82 | return val; |
| 83 | |
| 84 | return mle1->start_pc - mle2->start_pc; |
| 85 | } |
| 86 | |
| 87 | static int |
| 88 | dump_insns (struct ui_out *uiout, struct disassemble_info * di, |
| 89 | CORE_ADDR low, CORE_ADDR high, |
| 90 | int how_many, struct ui_stream *stb) |
| 91 | { |
| 92 | int num_displayed = 0; |
| 93 | CORE_ADDR pc; |
| 94 | |
| 95 | /* parts of the symbolic representation of the address */ |
| 96 | int unmapped; |
| 97 | int offset; |
| 98 | int line; |
| 99 | struct cleanup *ui_out_chain; |
| 100 | |
| 101 | for (pc = low; pc < high;) |
| 102 | { |
| 103 | char *filename = NULL((void*)0); |
| 104 | char *name = NULL((void*)0); |
| 105 | |
| 106 | QUIT{ if (quit_flag) quit (); if (deprecated_interactive_hook) deprecated_interactive_hook (); }; |
| 107 | if (how_many >= 0) |
| 108 | { |
| 109 | if (num_displayed >= how_many) |
| 110 | break; |
| 111 | else |
| 112 | num_displayed++; |
| 113 | } |
| 114 | ui_out_chain = make_cleanup_ui_out_tuple_begin_end (uiout, NULL((void*)0)); |
| 115 | ui_out_field_core_addr (uiout, "address", pc); |
| 116 | |
| 117 | if (!build_address_symbolic (pc, 0, &name, &offset, &filename, |
| 118 | &line, &unmapped)) |
| 119 | { |
| 120 | /* We don't care now about line, filename and |
| 121 | unmapped. But we might in the future. */ |
| 122 | ui_out_text (uiout, " <"); |
| 123 | ui_out_field_string (uiout, "func-name", name); |
| 124 | ui_out_text (uiout, "+"); |
| 125 | ui_out_field_int (uiout, "offset", offset); |
| 126 | ui_out_text (uiout, ">:\t"); |
| 127 | } |
| 128 | else |
| 129 | ui_out_text (uiout, ":\t"); |
| 130 | |
| 131 | if (filename != NULL((void*)0)) |
| 132 | xfree (filename); |
| 133 | if (name != NULL((void*)0)) |
| 134 | xfree (name); |
| 135 | |
| 136 | ui_file_rewind (stb->stream); |
| 137 | pc += TARGET_PRINT_INSN (pc, di)(gdbarch_print_insn (current_gdbarch, pc, di)); |
| 138 | ui_out_field_stream (uiout, "inst", stb); |
| 139 | ui_file_rewind (stb->stream); |
| 140 | do_cleanups (ui_out_chain); |
| 141 | ui_out_text (uiout, "\n"); |
| 142 | } |
| 143 | return num_displayed; |
| 144 | } |
| 145 | |
| 146 | /* The idea here is to present a source-O-centric view of a |
| 147 | function to the user. This means that things are presented |
| 148 | in source order, with (possibly) out of order assembly |
| 149 | immediately following. */ |
| 150 | static void |
| 151 | do_mixed_source_and_assembly (struct ui_out *uiout, |
| 152 | struct disassemble_info *di, int nlines, |
| 153 | struct linetable_entry *le, |
| 154 | CORE_ADDR low, CORE_ADDR high, |
| 155 | struct symtab *symtab, |
| 156 | int how_many, struct ui_stream *stb) |
| 157 | { |
| 158 | int newlines = 0; |
| 159 | struct dis_line_entry *mle; |
| 160 | struct symtab_and_line sal; |
| 161 | int i; |
| 162 | int out_of_order = 0; |
| 163 | int next_line = 0; |
| 164 | CORE_ADDR pc; |
| 165 | int num_displayed = 0; |
| 166 | struct cleanup *ui_out_chain; |
| 167 | struct cleanup *ui_out_tuple_chain = make_cleanup (null_cleanup, 0); |
| 168 | struct cleanup *ui_out_list_chain = make_cleanup (null_cleanup, 0); |
| 169 | |
| 170 | mle = (struct dis_line_entry *) alloca (nlines__builtin_alloca(nlines * sizeof (struct dis_line_entry)) |
| 171 | * sizeof (struct dis_line_entry))__builtin_alloca(nlines * sizeof (struct dis_line_entry)); |
| 172 | |
| 173 | /* Copy linetable entries for this function into our data |
| 174 | structure, creating end_pc's and setting out_of_order as |
| 175 | appropriate. */ |
| 176 | |
| 177 | /* First, skip all the preceding functions. */ |
| 178 | |
| 179 | for (i = 0; i < nlines - 1 && le[i].pc < low; i++); |
| 180 | |
| 181 | /* Now, copy all entries before the end of this function. */ |
| 182 | |
| 183 | for (; i < nlines - 1 && le[i].pc < high; i++) |
| 184 | { |
| 185 | if (le[i].line == le[i + 1].line && le[i].pc == le[i + 1].pc) |
| 186 | continue; /* Ignore duplicates */ |
| 187 | |
| 188 | /* Skip any end-of-function markers. */ |
| 189 | if (le[i].line == 0) |
| 190 | continue; |
| 191 | |
| 192 | mle[newlines].line = le[i].line; |
| 193 | if (le[i].line > le[i + 1].line) |
| 194 | out_of_order = 1; |
| 195 | mle[newlines].start_pc = le[i].pc; |
| 196 | mle[newlines].end_pc = le[i + 1].pc; |
| 197 | newlines++; |
| 198 | } |
| 199 | |
| 200 | /* If we're on the last line, and it's part of the function, |
| 201 | then we need to get the end pc in a special way. */ |
| 202 | |
| 203 | if (i == nlines - 1 && le[i].pc < high) |
| 204 | { |
| 205 | mle[newlines].line = le[i].line; |
| 206 | mle[newlines].start_pc = le[i].pc; |
| 207 | sal = find_pc_line (le[i].pc, 0); |
| 208 | mle[newlines].end_pc = sal.end; |
| 209 | newlines++; |
| 210 | } |
| 211 | |
| 212 | /* Now, sort mle by line #s (and, then by addresses within |
| 213 | lines). */ |
| 214 | |
| 215 | if (out_of_order) |
| 216 | qsort (mle, newlines, sizeof (struct dis_line_entry), compare_lines); |
| 217 | |
| 218 | /* Now, for each line entry, emit the specified lines (unless |
| 219 | they have been emitted before), followed by the assembly code |
| 220 | for that line. */ |
| 221 | |
| 222 | ui_out_chain = make_cleanup_ui_out_list_begin_end (uiout, "asm_insns"); |
| 223 | |
| 224 | for (i = 0; i < newlines; i++) |
| 225 | { |
| 226 | /* Print out everything from next_line to the current line. */ |
| 227 | if (mle[i].line >= next_line) |
| 228 | { |
| 229 | if (next_line != 0) |
| 230 | { |
| 231 | /* Just one line to print. */ |
| 232 | if (next_line == mle[i].line) |
| 233 | { |
| 234 | ui_out_tuple_chain |
| 235 | = make_cleanup_ui_out_tuple_begin_end (uiout, |
| 236 | "src_and_asm_line"); |
| 237 | print_source_lines (symtab, next_line, mle[i].line + 1, 0); |
| 238 | } |
| 239 | else |
| 240 | { |
| 241 | /* Several source lines w/o asm instructions associated. */ |
| 242 | for (; next_line < mle[i].line; next_line++) |
| 243 | { |
| 244 | struct cleanup *ui_out_list_chain_line; |
| 245 | struct cleanup *ui_out_tuple_chain_line; |
| 246 | |
| 247 | ui_out_tuple_chain_line |
| 248 | = make_cleanup_ui_out_tuple_begin_end (uiout, |
| 249 | "src_and_asm_line"); |
| 250 | print_source_lines (symtab, next_line, next_line + 1, |
| 251 | 0); |
| 252 | ui_out_list_chain_line |
| 253 | = make_cleanup_ui_out_list_begin_end (uiout, |
| 254 | "line_asm_insn"); |
| 255 | do_cleanups (ui_out_list_chain_line); |
| 256 | do_cleanups (ui_out_tuple_chain_line); |
| 257 | } |
| 258 | /* Print the last line and leave list open for |
| 259 | asm instructions to be added. */ |
| 260 | ui_out_tuple_chain |
| 261 | = make_cleanup_ui_out_tuple_begin_end (uiout, |
| 262 | "src_and_asm_line"); |
| 263 | print_source_lines (symtab, next_line, mle[i].line + 1, 0); |
| 264 | } |
| 265 | } |
| 266 | else |
| 267 | { |
| 268 | ui_out_tuple_chain |
| 269 | = make_cleanup_ui_out_tuple_begin_end (uiout, "src_and_asm_line"); |
| 270 | print_source_lines (symtab, mle[i].line, mle[i].line + 1, 0); |
| 271 | } |
| 272 | |
| 273 | next_line = mle[i].line + 1; |
| 274 | ui_out_list_chain |
| 275 | = make_cleanup_ui_out_list_begin_end (uiout, "line_asm_insn"); |
| 276 | } |
| 277 | |
| 278 | num_displayed += dump_insns (uiout, di, mle[i].start_pc, mle[i].end_pc, |
| 279 | how_many, stb); |
| 280 | |
| 281 | /* When we've reached the end of the mle array, or we've seen the last |
| 282 | assembly range for this source line, close out the list/tuple. */ |
| 283 | if (i == (newlines - 1) || mle[i + 1].line > mle[i].line) |
| 284 | { |
| 285 | do_cleanups (ui_out_list_chain); |
| 286 | do_cleanups (ui_out_tuple_chain); |
| 287 | ui_out_tuple_chain = make_cleanup (null_cleanup, 0); |
| 288 | ui_out_list_chain = make_cleanup (null_cleanup, 0); |
| 289 | ui_out_text (uiout, "\n"); |
| 290 | } |
| 291 | if (how_many >= 0 && num_displayed >= how_many) |
| 292 | break; |
| 293 | } |
| 294 | do_cleanups (ui_out_chain); |
| 295 | } |
| 296 | |
| 297 | |
| 298 | static void |
| 299 | do_assembly_only (struct ui_out *uiout, struct disassemble_info * di, |
| 300 | CORE_ADDR low, CORE_ADDR high, |
| 301 | int how_many, struct ui_stream *stb) |
| 302 | { |
| 303 | int num_displayed = 0; |
| 304 | struct cleanup *ui_out_chain; |
| 305 | |
| 306 | ui_out_chain = make_cleanup_ui_out_list_begin_end (uiout, "asm_insns"); |
| 307 | |
| 308 | num_displayed = dump_insns (uiout, di, low, high, how_many, stb); |
Value stored to 'num_displayed' is never read | |
| 309 | |
| 310 | do_cleanups (ui_out_chain); |
| 311 | } |
| 312 | |
| 313 | /* Initialize the disassemble info struct ready for the specified |
| 314 | stream. */ |
| 315 | |
| 316 | static int |
| 317 | fprintf_disasm (void *stream, const char *format, ...) |
| 318 | { |
| 319 | va_list args; |
| 320 | va_start (args, format)__builtin_va_start(args, format); |
| 321 | vfprintf_filtered (stream, format, args); |
| 322 | va_end (args)__builtin_va_end(args); |
| 323 | /* Something non -ve. */ |
| 324 | return 0; |
| 325 | } |
| 326 | |
| 327 | static struct disassemble_info |
| 328 | gdb_disassemble_info (struct gdbarch *gdbarch, struct ui_file *file) |
| 329 | { |
| 330 | struct disassemble_info di; |
| 331 | init_disassemble_info (&di, file, fprintf_disasm); |
| 332 | di.flavour = bfd_target_unknown_flavour; |
| 333 | di.memory_error_func = dis_asm_memory_error; |
| 334 | di.print_address_func = dis_asm_print_address; |
| 335 | /* NOTE: cagney/2003-04-28: The original code, from the old Insight |
| 336 | disassembler had a local optomization here. By default it would |
| 337 | access the executable file, instead of the target memory (there |
| 338 | was a growing list of exceptions though). Unfortunately, the |
| 339 | heuristic was flawed. Commands like "disassemble &variable" |
| 340 | didn't work as they relied on the access going to the target. |
| 341 | Further, it has been supperseeded by trust-read-only-sections |
| 342 | (although that should be superseeded by target_trust..._p()). */ |
| 343 | di.read_memory_func = dis_asm_read_memory; |
| 344 | di.arch = gdbarch_bfd_arch_info (gdbarch)->arch; |
| 345 | di.mach = gdbarch_bfd_arch_info (gdbarch)->mach; |
| 346 | di.endian = gdbarch_byte_order (gdbarch); |
| 347 | return di; |
| 348 | } |
| 349 | |
| 350 | void |
| 351 | gdb_disassembly (struct ui_out *uiout, |
| 352 | char *file_string, |
| 353 | int line_num, |
| 354 | int mixed_source_and_assembly, |
| 355 | int how_many, CORE_ADDR low, CORE_ADDR high) |
| 356 | { |
| 357 | struct ui_stream *stb = ui_out_stream_new (uiout); |
| 358 | struct cleanup *cleanups = make_cleanup_ui_out_stream_delete (stb); |
| 359 | struct disassemble_info di = gdb_disassemble_info (current_gdbarch, stb->stream); |
| 360 | /* To collect the instruction outputted from opcodes. */ |
| 361 | struct symtab *symtab = NULL((void*)0); |
| 362 | struct linetable_entry *le = NULL((void*)0); |
| 363 | int nlines = -1; |
| 364 | |
| 365 | /* Assume symtab is valid for whole PC range */ |
| 366 | symtab = find_pc_symtab (low); |
| 367 | |
| 368 | if (symtab != NULL((void*)0) && symtab->linetable != NULL((void*)0)) |
| 369 | { |
| 370 | /* Convert the linetable to a bunch of my_line_entry's. */ |
| 371 | le = symtab->linetable->item; |
| 372 | nlines = symtab->linetable->nitems; |
| 373 | } |
| 374 | |
| 375 | if (!mixed_source_and_assembly || nlines <= 0 |
| 376 | || symtab == NULL((void*)0) || symtab->linetable == NULL((void*)0)) |
| 377 | do_assembly_only (uiout, &di, low, high, how_many, stb); |
| 378 | |
| 379 | else if (mixed_source_and_assembly) |
| 380 | do_mixed_source_and_assembly (uiout, &di, nlines, le, low, |
| 381 | high, symtab, how_many, stb); |
| 382 | |
| 383 | do_cleanups (cleanups); |
| 384 | gdb_flush (gdb_stdout); |
| 385 | } |
| 386 | |
| 387 | /* Print the instruction at address MEMADDR in debugged memory, |
| 388 | on STREAM. Returns length of the instruction, in bytes. */ |
| 389 | |
| 390 | int |
| 391 | gdb_print_insn (CORE_ADDR memaddr, struct ui_file *stream) |
| 392 | { |
| 393 | struct disassemble_info di = gdb_disassemble_info (current_gdbarch, stream); |
| 394 | return TARGET_PRINT_INSN (memaddr, &di)(gdbarch_print_insn (current_gdbarch, memaddr, &di)); |
| 395 | } |