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 #include "cycript.hpp"
  41
  42 #include <cstdio>
  43 #include <sstream>
  44
  45 #include <setjmp.h>
  46
  47 #include <readline/readline.h>
  48 #include <readline/history.h>
  49
  50 #include <sys/mman.h>
  51
  52 #include <errno.h>
  53 #include <unistd.h>
  54
  55 #include <sys/types.h>
  56 #include <sys/stat.h>
  57 #include <fcntl.h>
  58
  59 #include "Cycript.tab.hh"
  60
  61 #include <sys/types.h>
  62 #include <sys/socket.h>
  63 #include <netinet/in.h>
  64 #include <sys/un.h>
  65
  66 static volatile enum {
  67     Working,
  68     Parsing,
  69     Running,
  70     Sending,
  71     Waiting,
  72 } mode_;
  73
  74 static jmp_buf ctrlc_;
  75
  76 static void sigint(int) {
  77     switch (mode_) {
  78         case Working:
  79             return;
  80         case Parsing:
  81             longjmp(ctrlc_, 1);
  82         case Running:
  83             throw "*** Ctrl-C";
  84         case Sending:
  85             return;
  86         case Waiting:
  87             return;
  88     }
  89 }
  90
  91 #if YYDEBUG
  92 static bool bison_;
  93 #endif
  94 static bool strict_;
  95 static bool pretty_;
  96
  97 void Setup(CYDriver &driver, cy::parser &parser) {
  98 #if YYDEBUG
  99     if (bison_)
 100         parser.set_debug_level(1);
 101 #endif
 102     if (strict_)
 103         driver.strict_ = true;
 104 }
 105
 106 void Setup(CYOutput &out, CYDriver &driver) {
 107     out.pretty_ = pretty_;
 108
 109     CYContext context(driver.pool_);
 110     driver.program_->Replace(context);
 111 }
 112
 113 void Run(int socket, const char *data, size_t size, FILE *fout = NULL, bool expand = false) {
 114     CYPool pool;
 115
 116     const char *json;
 117     if (socket == -1) {
 118         mode_ = Running;
 119 #ifdef CY_EXECUTE
 120         json = CYExecute(pool, data);
 121 #else
 122         json = NULL;
 123 #endif
 124         mode_ = Working;
 125         if (json != NULL)
 126             size = strlen(json);
 127     } else {
 128         mode_ = Sending;
 129         CYSendAll(socket, &size, sizeof(size));
 130         CYSendAll(socket, data, size);
 131         mode_ = Waiting;
 132         CYRecvAll(socket, &size, sizeof(size));
 133         if (size == _not(size_t))
 134             json = NULL;
 135         else {
 136             char *temp(new(pool) char[size + 1]);
 137             CYRecvAll(socket, temp, size);
 138             temp[size] = '\0';
 139             json = temp;
 140         }
 141         mode_ = Working;
 142     }
 143
 144     if (json != NULL && fout != NULL) {
 145         if (!expand || json[0] != '"' && json[0] != '\'')
 146             fputs(json, fout);
 147         else for (size_t i(0); i != size; ++i)
 148             if (json[i] != '\\')
 149                 fputc(json[i], fout);
 150             else switch(json[++i]) {
 151                 case '\0': goto done;
 152                 case '\\': fputc('\\', fout); break;
 153                 case '\'': fputc('\'', fout); break;
 154                 case '"': fputc('"', fout); break;
 155                 case 'b': fputc('\b', fout); break;
 156                 case 'f': fputc('\f', fout); break;
 157                 case 'n': fputc('\n', fout); break;
 158                 case 'r': fputc('\r', fout); break;
 159                 case 't': fputc('\t', fout); break;
 160                 case 'v': fputc('\v', fout); break;
 161                 default: fputc('\\', fout); --i; break;
 162             }
 163
 164       done:
 165         fputs("\n", fout);
 166         fflush(fout);
 167     }
 168 }
 169
 170 void Run(int socket, std::string &code, FILE *fout = NULL, bool expand = false) {
 171     Run(socket, code.c_str(), code.size(), fout, expand);
 172 }
 173
 174 static void Console(int socket) {
 175     bool bypass(false);
 176     bool debug(false);
 177     bool expand(false);
 178
 179     FILE *fout(stdout);
 180
 181     rl_bind_key('\t', rl_insert);
 182
 183     struct sigaction action;
 184     sigemptyset(&action.sa_mask);
 185     action.sa_handler = &sigint;
 186     action.sa_flags = 0;
 187     sigaction(SIGINT, &action, NULL);
 188
 189     restart: for (;;) {
 190         std::string command;
 191         std::vector<std::string> lines;
 192
 193         bool extra(false);
 194         const char *prompt("cy# ");
 195
 196         if (setjmp(ctrlc_) != 0) {
 197             mode_ = Working;
 198             fputs("\n", fout);
 199             fflush(fout);
 200             goto restart;
 201         }
 202
 203       read:
 204         mode_ = Parsing;
 205         char *line(readline(prompt));
 206         mode_ = Working;
 207         if (line == NULL)
 208             break;
 209
 210         if (!extra) {
 211             extra = true;
 212             if (line[0] == '?') {
 213                 std::string data(line + 1);
 214                 if (data == "bypass") {
 215                     bypass = !bypass;
 216                     fprintf(fout, "bypass == %s\n", bypass ? "true" : "false");
 217                     fflush(fout);
 218                 } else if (data == "debug") {
 219                     debug = !debug;
 220                     fprintf(fout, "debug == %s\n", debug ? "true" : "false");
 221                     fflush(fout);
 222                 } else if (data == "expand") {
 223                     expand = !expand;
 224                     fprintf(fout, "expand == %s\n", expand ? "true" : "false");
 225                     fflush(fout);
 226                 }
 227                 add_history(line);
 228                 goto restart;
 229             }
 230         }
 231
 232         command += line;
 233
 234         char *begin(line), *end(line + strlen(line));
 235         while (char *nl = reinterpret_cast<char *>(memchr(begin, '\n', end - begin))) {
 236             *nl = '\0';
 237             lines.push_back(begin);
 238             begin = nl + 1;
 239         }
 240
 241         lines.push_back(begin);
 242
 243         free(line);
 244
 245         std::string code;
 246
 247         if (bypass)
 248             code = command;
 249         else {
 250             CYDriver driver("");
 251             cy::parser parser(driver);
 252             Setup(driver, parser);
 253
 254             driver.data_ = command.c_str();
 255             driver.size_ = command.size();
 256
 257             if (parser.parse() != 0 || !driver.errors_.empty()) {
 258                 for (CYDriver::Errors::const_iterator error(driver.errors_.begin()); error != driver.errors_.end(); ++error) {
 259                     cy::position begin(error->location_.begin);
 260                     if (begin.line != lines.size() || begin.column - 1 != lines.back().size() || error->warning_) {
 261                         cy::position end(error->location_.end);
 262
 263                         if (begin.line != lines.size()) {
 264                             std::cerr << "  | ";
 265                             std::cerr << lines[begin.line - 1] << std::endl;
 266                         }
 267
 268                         std::cerr << "....";
 269                         for (size_t i(0); i != begin.column - 1; ++i)
 270                             std::cerr << '.';
 271                         if (begin.line != end.line || begin.column == end.column)
 272                             std::cerr << '^';
 273                         else for (size_t i(0), e(end.column - begin.column); i != e; ++i)
 274                             std::cerr << '^';
 275                         std::cerr << std::endl;
 276
 277                         std::cerr << "  | ";
 278                         std::cerr << error->message_ << std::endl;
 279
 280                         add_history(command.c_str());
 281                         goto restart;
 282                     }
 283                 }
 284
 285                 driver.errors_.clear();
 286
 287                 command += '\n';
 288                 prompt = "cy> ";
 289                 goto read;
 290             }
 291
 292             if (driver.program_ == NULL)
 293                 goto restart;
 294
 295             if (socket != -1)
 296                 code = command;
 297             else {
 298                 std::ostringstream str;
 299                 CYOutput out(str);
 300                 Setup(out, driver);
 301                 out << *driver.program_;
 302                 code = str.str();
 303             }
 304         }
 305
 306         add_history(command.c_str());
 307
 308         if (debug)
 309             std::cout << code << std::endl;
 310
 311         Run(socket, code, fout, expand);
 312     }
 313
 314     fputs("\n", fout);
 315     fflush(fout);
 316 }
 317
 318 static void *Map(const char *path, size_t *psize) {
 319     int fd;
 320     _syscall(fd = open(path, O_RDONLY));
 321
 322     struct stat stat;
 323     _syscall(fstat(fd, &stat));
 324     size_t size(stat.st_size);
 325
 326     *psize = size;
 327
 328     void *base;
 329     _syscall(base = mmap(NULL, size, PROT_READ, MAP_SHARED, fd, 0));
 330
 331     _syscall(close(fd));
 332     return base;
 333 }
 334
 335 int main(int argc, char *argv[]) {
 336     bool tty(isatty(STDIN_FILENO));
 337     bool compile(false);
 338
 339 #ifdef CY_ATTACH
 340     pid_t pid(_not(pid_t));
 341 #endif
 342
 343     for (;;) switch (getopt(argc, argv,
 344         "cg:n:"
 345 #ifdef CY_ATTACH
 346         "p:"
 347 #endif
 348         "s"
 349     )) {
 350         case -1:
 351             goto getopt;
 352         case '?':
 353             fprintf(stderr, "usage: cycript [-c]"
 354 #ifdef CY_ATTACH
 355             " [-p <pid>]"
 356 #endif
 357             " [<script> [<arg>...]]\n");
 358             return 1;
 359
 360         case 'c':
 361             compile = true;
 362         break;
 363
 364         case 'g':
 365             if (false);
 366 #if YYDEBUG
 367             else if (strcmp(optarg, "bison") == 0)
 368                 bison_ = true;
 369 #endif
 370             else {
 371                 fprintf(stderr, "invalid name for -g\n");
 372                 return 1;
 373             }
 374         break;
 375
 376         case 'n':
 377             if (false);
 378             else if (strcmp(optarg, "minify") == 0)
 379                 pretty_ = true;
 380             else {
 381                 fprintf(stderr, "invalid name for -n\n");
 382                 return 1;
 383             }
 384         break;
 385
 386 #ifdef CY_ATTACH
 387         case 'p': {
 388             size_t size(strlen(optarg));
 389             char *end;
 390             pid = strtoul(optarg, &end, 0);
 391             if (optarg + size != end) {
 392                 fprintf(stderr, "invalid pid for -p\n");
 393                 return 1;
 394             }
 395         } break;
 396 #endif
 397
 398         case 's':
 399             strict_ = true;
 400         break;
 401     } getopt:;
 402
 403     const char *script;
 404
 405 #ifdef CY_ATTACH
 406     if (pid != _not(pid_t) && optind < argc - 1) {
 407         fprintf(stderr, "-p cannot set argv\n");
 408         return 1;
 409     }
 410
 411     if (pid != _not(pid_t) && compile) {
 412         fprintf(stderr, "-p conflicts with -c\n");
 413         return 1;
 414     }
 415 #endif
 416
 417     if (optind == argc)
 418         script = NULL;
 419     else {
 420 #ifdef CY_EXECUTE
 421         // XXX: const_cast?! wtf gcc :(
 422         CYSetArgs(argc - optind - 1, const_cast<const char **>(argv + optind + 1));
 423 #endif
 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 }