Console.cpp

   1 /* Cycript - Remove Execution Server and Disassembler
   2  * Copyright (C) 2009  Jay Freeman (saurik)
   3 */
   4
   5 /* Modified BSD License {{{ */
   6 /*
   7  *        Redistribution and use in source and binary
   8  * forms, with or without modification, are permitted
   9  * provided that the following conditions are met:
  10  *
  11  * 1. Redistributions of source code must retain the
  12  *    above copyright notice, this list of conditions
  13  *    and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the
  15  *    above copyright notice, this list of conditions
  16  *    and the following disclaimer in the documentation
  17  *    and/or other materials provided with the
  18  *    distribution.
  19  * 3. The name of the author may not be used to endorse
  20  *    or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS''
  24  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
  25  * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  26  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE
  28  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  29  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  30  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  31  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  32  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
  34  * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  35  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  36  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  37 */
  38 /* }}} */
  39
  40 #define _GNU_SOURCE
  41
  42 #include "cycript.hpp"
  43
  44 #include <cstdio>
  45 #include <sstream>
  46
  47 #include <setjmp.h>
  48
  49 #include <readline/readline.h>
  50 #include <readline/history.h>
  51
  52 #include <sys/mman.h>
  53
  54 #include <errno.h>
  55 #include <unistd.h>
  56
  57 #include <sys/types.h>
  58 #include <sys/stat.h>
  59 #include <fcntl.h>
  60
  61 #include "Cycript.tab.hh"
  62
  63 #include <sys/types.h>
  64 #include <sys/socket.h>
  65 #include <netinet/in.h>
  66 #include <sys/un.h>
  67
  68 static volatile enum {
  69     Working,
  70     Parsing,
  71     Running,
  72     Sending,
  73     Waiting,
  74 } mode_;
  75
  76 static jmp_buf ctrlc_;
  77
  78 static void sigint(int) {
  79     switch (mode_) {
  80         case Working:
  81             return;
  82         case Parsing:
  83             longjmp(ctrlc_, 1);
  84         case Running:
  85             throw "*** Ctrl-C";
  86         case Sending:
  87             return;
  88         case Waiting:
  89             return;
  90     }
  91 }
  92
  93 #if YYDEBUG
  94 static bool bison_;
  95 #endif
  96 static bool strict_;
  97 static bool pretty_;
  98
  99 void Setup(CYDriver &driver, cy::parser &parser) {
 100 #if YYDEBUG
 101     if (bison_)
 102         parser.set_debug_level(1);
 103 #endif
 104     if (strict_)
 105         driver.strict_ = true;
 106 }
 107
 108 void Setup(CYOutput &out, CYDriver &driver) {
 109     out.pretty_ = pretty_;
 110
 111     CYContext context(driver.pool_);
 112     driver.program_->Replace(context);
 113 }
 114
 115 void Run(int socket, const char *data, size_t size, FILE *fout = NULL, bool expand = false) {
 116     CYPool pool;
 117
 118     const char *json;
 119     if (socket == -1) {
 120         mode_ = Running;
 121 #ifdef CY_EXECUTE
 122         json = CYExecute(pool, data);
 123 #else
 124         json = NULL;
 125 #endif
 126         mode_ = Working;
 127         if (json != NULL)
 128             size = strlen(json);
 129     } else {
 130         mode_ = Sending;
 131         CYSendAll(socket, &size, sizeof(size));
 132         CYSendAll(socket, data, size);
 133         mode_ = Waiting;
 134         CYRecvAll(socket, &size, sizeof(size));
 135         if (size == _not(size_t))
 136             json = NULL;
 137         else {
 138             char *temp(new(pool) char[size + 1]);
 139             CYRecvAll(socket, temp, size);
 140             temp[size] = '\0';
 141             json = temp;
 142         }
 143         mode_ = Working;
 144     }
 145
 146     if (json != NULL && fout != NULL) {
 147         if (!expand || json[0] != '"' && json[0] != '\'')
 148             fputs(json, fout);
 149         else for (size_t i(0); i != size; ++i)
 150             if (json[i] != '\\')
 151                 fputc(json[i], fout);
 152             else switch(json[++i]) {
 153                 case '\0': goto done;
 154                 case '\\': fputc('\\', fout); break;
 155                 case '\'': fputc('\'', fout); break;
 156                 case '"': fputc('"', fout); break;
 157                 case 'b': fputc('\b', fout); break;
 158                 case 'f': fputc('\f', fout); break;
 159                 case 'n': fputc('\n', fout); break;
 160                 case 'r': fputc('\r', fout); break;
 161                 case 't': fputc('\t', fout); break;
 162                 case 'v': fputc('\v', fout); break;
 163                 default: fputc('\\', fout); --i; break;
 164             }
 165
 166       done:
 167         fputs("\n", fout);
 168         fflush(fout);
 169     }
 170 }
 171
 172 void Run(int socket, std::string &code, FILE *fout = NULL, bool expand = false) {
 173     Run(socket, code.c_str(), code.size(), fout, expand);
 174 }
 175
 176 static void Console(int socket) {
 177     bool bypass(false);
 178     bool debug(false);
 179     bool expand(false);
 180
 181     FILE *fout(stdout);
 182
 183     rl_bind_key('\t', rl_insert);
 184
 185     struct sigaction action;
 186     sigemptyset(&action.sa_mask);
 187     action.sa_handler = &sigint;
 188     action.sa_flags = 0;
 189     sigaction(SIGINT, &action, NULL);
 190
 191     restart: for (;;) {
 192         std::string command;
 193         std::vector<std::string> lines;
 194
 195         bool extra(false);
 196         const char *prompt("cy# ");
 197
 198         if (setjmp(ctrlc_) != 0) {
 199             mode_ = Working;
 200             fputs("\n", fout);
 201             fflush(fout);
 202             goto restart;
 203         }
 204
 205       read:
 206         mode_ = Parsing;
 207         char *line(readline(prompt));
 208         mode_ = Working;
 209         if (line == NULL)
 210             break;
 211
 212         if (!extra) {
 213             extra = true;
 214             if (line[0] == '?') {
 215                 std::string data(line + 1);
 216                 if (data == "bypass") {
 217                     bypass = !bypass;
 218                     fprintf(fout, "bypass == %s\n", bypass ? "true" : "false");
 219                     fflush(fout);
 220                 } else if (data == "debug") {
 221                     debug = !debug;
 222                     fprintf(fout, "debug == %s\n", debug ? "true" : "false");
 223                     fflush(fout);
 224                 } else if (data == "expand") {
 225                     expand = !expand;
 226                     fprintf(fout, "expand == %s\n", expand ? "true" : "false");
 227                     fflush(fout);
 228                 }
 229                 add_history(line);
 230                 goto restart;
 231             }
 232         }
 233
 234         command += line;
 235
 236         char *begin(line), *end(line + strlen(line));
 237         while (char *nl = reinterpret_cast<char *>(memchr(begin, '\n', end - begin))) {
 238             *nl = '\0';
 239             lines.push_back(begin);
 240             begin = nl + 1;
 241         }
 242
 243         lines.push_back(begin);
 244
 245         free(line);
 246
 247         std::string code;
 248
 249         if (bypass)
 250             code = command;
 251         else {
 252             CYDriver driver("");
 253             cy::parser parser(driver);
 254             Setup(driver, parser);
 255
 256             driver.data_ = command.c_str();
 257             driver.size_ = command.size();
 258
 259             if (parser.parse() != 0 || !driver.errors_.empty()) {
 260                 for (CYDriver::Errors::const_iterator error(driver.errors_.begin()); error != driver.errors_.end(); ++error) {
 261                     cy::position begin(error->location_.begin);
 262                     if (begin.line != lines.size() || begin.column - 1 != lines.back().size() || error->warning_) {
 263                         cy::position end(error->location_.end);
 264
 265                         if (begin.line != lines.size()) {
 266                             std::cerr << "  | ";
 267                             std::cerr << lines[begin.line - 1] << std::endl;
 268                         }
 269
 270                         std::cerr << "....";
 271                         for (size_t i(0); i != begin.column - 1; ++i)
 272                             std::cerr << '.';
 273                         if (begin.line != end.line || begin.column == end.column)
 274                             std::cerr << '^';
 275                         else for (size_t i(0), e(end.column - begin.column); i != e; ++i)
 276                             std::cerr << '^';
 277                         std::cerr << std::endl;
 278
 279                         std::cerr << "  | ";
 280                         std::cerr << error->message_ << std::endl;
 281
 282                         add_history(command.c_str());
 283                         goto restart;
 284                     }
 285                 }
 286
 287                 driver.errors_.clear();
 288
 289                 command += '\n';
 290                 prompt = "cy> ";
 291                 goto read;
 292             }
 293
 294             if (driver.program_ == NULL)
 295                 goto restart;
 296
 297             if (socket != -1)
 298                 code = command;
 299             else {
 300                 std::ostringstream str;
 301                 CYOutput out(str);
 302                 Setup(out, driver);
 303                 out << *driver.program_;
 304                 code = str.str();
 305             }
 306         }
 307
 308         add_history(command.c_str());
 309
 310         if (debug)
 311             std::cout << code << std::endl;
 312
 313         Run(socket, code, fout, expand);
 314     }
 315
 316     fputs("\n", fout);
 317     fflush(fout);
 318 }
 319
 320 static void *Map(const char *path, size_t *psize) {
 321     int fd;
 322     _syscall(fd = open(path, O_RDONLY));
 323
 324     struct stat stat;
 325     _syscall(fstat(fd, &stat));
 326     size_t size(stat.st_size);
 327
 328     *psize = size;
 329
 330     void *base;
 331     _syscall(base = mmap(NULL, size, PROT_READ, MAP_SHARED, fd, 0));
 332
 333     _syscall(close(fd));
 334     return base;
 335 }
 336
 337 int main(int argc, char *argv[]) {
 338     bool tty(isatty(STDIN_FILENO));
 339     bool compile(false);
 340
 341 #ifdef CY_ATTACH
 342     pid_t pid(_not(pid_t));
 343 #endif
 344
 345     for (;;) switch (getopt(argc, argv,
 346         "cg:n:"
 347 #ifdef CY_ATTACH
 348         "p:"
 349 #endif
 350         "s"
 351     )) {
 352         case -1:
 353             goto getopt;
 354         case '?':
 355             fprintf(stderr, "usage: cycript [-c]"
 356 #ifdef CY_ATTACH
 357             " [-p <pid>]"
 358 #endif
 359             " [<script> [<arg>...]]\n");
 360             return 1;
 361
 362         case 'c':
 363             compile = true;
 364         break;
 365
 366         case 'g':
 367             if (false);
 368 #if YYDEBUG
 369             else if (strcmp(optarg, "bison") == 0)
 370                 bison_ = true;
 371 #endif
 372             else {
 373                 fprintf(stderr, "invalid name for -g\n");
 374                 return 1;
 375             }
 376         break;
 377
 378         case 'n':
 379             if (false);
 380             else if (strcmp(optarg, "minify") == 0)
 381                 pretty_ = true;
 382             else {
 383                 fprintf(stderr, "invalid name for -n\n");
 384                 return 1;
 385             }
 386         break;
 387
 388 #ifdef CY_ATTACH
 389         case 'p': {
 390             size_t size(strlen(optarg));
 391             char *end;
 392             pid = strtoul(optarg, &end, 0);
 393             if (optarg + size != end) {
 394                 fprintf(stderr, "invalid pid for -p\n");
 395                 return 1;
 396             }
 397         } break;
 398 #endif
 399
 400         case 's':
 401             strict_ = true;
 402         break;
 403     } getopt:;
 404
 405     const char *script;
 406
 407 #ifdef CY_ATTACH
 408     if (pid != _not(pid_t) && optind < argc - 1) {
 409         fprintf(stderr, "-p cannot set argv\n");
 410         return 1;
 411     }
 412
 413     if (pid != _not(pid_t) && compile) {
 414         fprintf(stderr, "-p conflicts with -c\n");
 415         return 1;
 416     }
 417 #endif
 418
 419     if (optind == argc)
 420         script = NULL;
 421     else {
 422         // XXX: const_cast?! wtf gcc :(
 423         CYSetArgs(argc - optind - 1, const_cast<const char **>(argv + optind + 1));
 424         script = argv[optind];
 425         if (strcmp(script, "-") == 0)
 426             script = NULL;
 427     }
 428
 429 #ifdef CY_ATTACH
 430     if (pid != _not(pid_t) && script == NULL && !tty) {
 431         fprintf(stderr, "non-terminal attaching to remote console\n");
 432         return 1;
 433     }
 434 #endif
 435
 436     int socket;
 437
 438 #ifdef CY_ATTACH
 439     if (pid == _not(pid_t))
 440         socket = -1;
 441     else {
 442         socket = _syscall(::socket(PF_UNIX, SOCK_STREAM, 0));
 443
 444         struct sockaddr_un address;
 445         memset(&address, 0, sizeof(address));
 446         address.sun_family = AF_UNIX;
 447         sprintf(address.sun_path, "/tmp/.s.cy.%u", pid);
 448
 449         _syscall(connect(socket, reinterpret_cast<sockaddr *>(&address), SUN_LEN(&address)));
 450     }
 451 #else
 452     socket = -1;
 453 #endif
 454
 455     if (script == NULL && tty)
 456         Console(socket);
 457     else {
 458         CYDriver driver(script ?: "<stdin>");
 459         cy::parser parser(driver);
 460         Setup(driver, parser);
 461
 462         char *start, *end;
 463
 464         if (script == NULL) {
 465             start = NULL;
 466             end = NULL;
 467
 468             driver.file_ = stdin;
 469         } else {
 470             size_t size;
 471             start = reinterpret_cast<char *>(Map(script, &size));
 472             end = start + size;
 473
 474             if (size >= 2 && start[0] == '#' && start[1] == '!') {
 475                 start += 2;
 476
 477                 if (void *line = memchr(start, '\n', end - start))
 478                     start = reinterpret_cast<char *>(line);
 479                 else
 480                     start = end;
 481             }
 482
 483             driver.data_ = start;
 484             driver.size_ = end - start;
 485         }
 486
 487         if (parser.parse() != 0 || !driver.errors_.empty()) {
 488             for (CYDriver::Errors::const_iterator i(driver.errors_.begin()); i != driver.errors_.end(); ++i)
 489                 std::cerr << i->location_.begin << ": " << i->message_ << std::endl;
 490         } else if (driver.program_ != NULL)
 491             if (socket != -1)
 492                 Run(socket, start, end - start, stdout);
 493             else {
 494                 std::ostringstream str;
 495                 CYOutput out(str);
 496                 Setup(out, driver);
 497                 out << *driver.program_;
 498                 std::string code(str.str());
 499                 if (compile)
 500                     std::cout << code;
 501                 else
 502                     Run(socket, code, stdout);
 503             }
 504     }
 505
 506     return 0;
 507 }