update

1 files changed, 590 insertions, 0 deletions

diff --git a/out/lua.c b/out/lua.c
new file mode 100644
index 0000000..b204e4b
--- /dev/null
+++ b/out/lua.c
@@ -0,0 +1,590 @@
+/*
+** $Id: lua.c,v 1.229 2016/12/22 13:08:50 roberto Exp roberto $
+** Lua stand-alone interpreter
+** See Copyright Notice in lua.h
+*/
+
+#define lua_c
+
+#include "../lua5/lprefix.h"
+
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "../lua5/lua.h"
+
+#include "../lua5/lauxlib.h"
+#include "../lua5/lualib.h"
+#include "./wasm_tables.h"
+
+#if !defined(LUA_PROMPT)
+#define LUA_PROMPT "> "
+#define LUA_PROMPT2 ">> "
+#endif
+
+#if !defined(LUA_PROGNAME)
+#define LUA_PROGNAME "lua"
+#endif
+
+#if !defined(LUA_MAXINPUT)
+#define LUA_MAXINPUT 512
+#endif
+
+#if !defined(LUA_INIT_VAR)
+#define LUA_INIT_VAR "LUA_INIT"
+#endif
+
+#define LUA_INITVARVERSION LUA_INIT_VAR LUA_VERSUFFIX
+
+/*
+** lua_stdin_is_tty detects whether the standard input is a 'tty' (that
+** is, whether we're running lua interactively).
+*/
+#if !defined(lua_stdin_is_tty) /* { */
+
+#if defined(LUA_USE_POSIX) /* { */
+
+#include <unistd.h>
+#define lua_stdin_is_tty() isatty(0)
+
+#elif defined(LUA_USE_WINDOWS) /* }{ */
+
+#include <io.h>
+#include <windows.h>
+
+#define lua_stdin_is_tty() _isatty(_fileno(stdin))
+
+#else                        /* }{ */
+
+/* ISO C definition */
+#define lua_stdin_is_tty() 1 /* assume stdin is a tty */
+
+#endif /* } */
+
+#endif /* } */
+
+/*
+** lua_readline defines how to show a prompt and then read a line from
+** the standard input.
+** lua_saveline defines how to "save" a read line in a "history".
+** lua_freeline defines how to free a line read by lua_readline.
+*/
+#if !defined(lua_readline) /* { */
+
+#if defined(LUA_USE_READLINE) /* { */
+
+#include <readline/history.h>
+#include <readline/readline.h>
+#define lua_readline(L, b, p) ((void)L, ((b) = readline(p)) != NULL)
+#define lua_saveline(L, line) ((void)L, add_history(line))
+#define lua_freeline(L, b) ((void)L, free(b))
+
+#else /* }{ */
+
+#define lua_readline(L, b, p)                                                  \
+  ((void)L, fputs(p, stdout), fflush(stdout), /* show prompt */                \
+   fgets(b, LUA_MAXINPUT, stdin) != NULL)     /* get line */
+#define lua_saveline(L, line)                                                  \
+  {                                                                            \
+    (void)L;                                                                   \
+    (void)line;                                                                \
+  }
+#define lua_freeline(L, b)                                                     \
+  {                                                                            \
+    (void)L;                                                                   \
+    (void)b;                                                                   \
+  }
+
+#endif /* } */
+
+#endif /* } */
+
+static lua_State *globalL = NULL;
+
+static const char *progname = LUA_PROGNAME;
+
+/*
+** Hook set by signal function to stop the interpreter.
+*/
+static void lstop(lua_State *L, lua_Debug *ar) {
+  (void)ar;                   /* unused arg. */
+  lua_sethook(L, NULL, 0, 0); /* reset hook */
+  luaL_error(L, "interrupted!");
+}
+
+/*
+** Function to be called at a C signal. Because a C signal cannot
+** just change a Lua state (as there is no proper synchronization),
+** this function only sets a hook that, when called, will stop the
+** interpreter.
+*/
+static void laction(int i) {
+  signal(i, SIG_DFL); /* if another SIGINT happens, terminate process */
+  lua_sethook(globalL, lstop, LUA_MASKCALL | LUA_MASKRET | LUA_MASKCOUNT, 1);
+}
+
+static void print_usage(const char *badoption) {
+  lua_writestringerror("%s: ", progname);
+  if (badoption[1] == 'e' || badoption[1] == 'l')
+    lua_writestringerror("'%s' needs argument\n", badoption);
+  else
+    lua_writestringerror("unrecognized option '%s'\n", badoption);
+  lua_writestringerror(
+      "usage: %s [options] [script [args]]\n"
+      "Available options are:\n"
+      "  -e stat  execute string 'stat'\n"
+      "  -i       enter interactive mode after executing 'script'\n"
+      "  -l name  require library 'name'\n"
+      "  -v       show version information\n"
+      "  -E       ignore environment variables\n"
+      "  --       stop handling options\n"
+      "  -        stop handling options and execute stdin\n",
+      progname);
+}
+
+/*
+** Prints an error message, adding the program name in front of it
+** (if present)
+*/
+static void l_message(const char *pname, const char *msg) {
+  if (pname)
+    lua_writestringerror("%s: ", pname);
+  lua_writestringerror("%s\n", msg);
+}
+
+/*
+** Check whether 'status' is not OK and, if so, prints the error
+** message on the top of the stack. It assumes that the error object
+** is a string, as it was either generated by Lua or by 'msghandler'.
+*/
+static int report(lua_State *L, int status) {
+  if (status != LUA_OK) {
+    const char *msg = lua_tostring(L, -1);
+    l_message(progname, msg);
+    lua_pop(L, 1); /* remove message */
+  }
+  return status;
+}
+
+/*
+** Message handler used to run all chunks
+*/
+static int msghandler(lua_State *L) {
+  const char *msg = lua_tostring(L, 1);
+  if (msg == NULL) {                         /* is error object not a string? */
+    if (luaL_callmeta(L, 1, "__tostring") && /* does it have a metamethod */
+        lua_type(L, -1) == LUA_TSTRING)      /* that produces a string? */
+      return 1;                              /* that is the message */
+    else
+      msg = lua_pushfstring(L, "(error object is a %s value)",
+                            luaL_typename(L, 1));
+  }
+  luaL_traceback(L, L, msg, 1); /* append a standard traceback */
+  return 1;                     /* return the traceback */
+}
+
+/*
+** Interface to 'lua_pcall', which sets appropriate message function
+** and C-signal handler. Used to run all chunks.
+*/
+static int docall(lua_State *L, int narg, int nres) {
+  int status;
+  int base = lua_gettop(L) - narg;  /* function index */
+  lua_pushcfunction(L, msghandler); /* push message handler */
+  lua_insert(L, base);              /* put it under function and args */
+  globalL = L;                      /* to be available to 'laction' */
+  signal(SIGINT, laction);          /* set C-signal handler */
+  status = lua_pcall(L, narg, nres, base);
+  signal(SIGINT, SIG_DFL); /* reset C-signal handler */
+  lua_remove(L, base);     /* remove message handler from the stack */
+  return status;
+}
+
+static void print_version(void) {
+  lua_writestring(LUA_COPYRIGHT, strlen(LUA_COPYRIGHT));
+  lua_writeline();
+}
+
+/*
+** Create the 'arg' table, which stores all arguments from the
+** command line ('argv'). It should be aligned so that, at index 0,
+** it has 'argv[script]', which is the script name. The arguments
+** to the script (everything after 'script') go to positive indices;
+** other arguments (before the script name) go to negative indices.
+** If there is no script name, assume interpreter's name as base.
+*/
+static void createargtable(lua_State *L, char **argv, int argc, int script) {
+  int i, narg;
+  if (script == argc)
+    script = 0;               /* no script name? */
+  narg = argc - (script + 1); /* number of positive indices */
+  lua_createtable(L, narg, script + 1);
+  for (i = 0; i < argc; i++) {
+    lua_pushstring(L, argv[i]);
+    lua_rawseti(L, -2, i - script);
+  }
+  lua_setglobal(L, "arg");
+}
+
+static int dochunk(lua_State *L, int status) {
+  if (status == LUA_OK)
+    status = docall(L, 0, 0);
+  return report(L, status);
+}
+
+static int dofile(lua_State *L, const char *name) {
+  return dochunk(L, luaL_loadfile(L, name));
+}
+
+static int dostring(lua_State *L, const char *s, const char *name) {
+  return dochunk(L, luaL_loadbuffer(L, s, strlen(s), name));
+}
+
+/*
+** Calls 'require(name)' and stores the result in a global variable
+** with the given name.
+*/
+static int dolibrary(lua_State *L, const char *name) {
+  int status;
+  lua_getglobal(L, "require");
+  lua_pushstring(L, name);
+  status = docall(L, 1, 1); /* call 'require(name)' */
+  if (status == LUA_OK)
+    lua_setglobal(L, name); /* global[name] = require return */
+  return report(L, status);
+}
+
+/*
+** Returns the string to be used as a prompt by the interpreter.
+*/
+static const char *get_prompt(lua_State *L, int firstline) {
+  const char *p;
+  lua_getglobal(L, firstline ? "_PROMPT" : "_PROMPT2");
+  p = lua_tostring(L, -1);
+  if (p == NULL)
+    p = (firstline ? LUA_PROMPT : LUA_PROMPT2);
+  return p;
+}
+
+/* mark in error messages for incomplete statements */
+#define EOFMARK "<eof>"
+#define marklen (sizeof(EOFMARK) / sizeof(char) - 1)
+
+/*
+** Check whether 'status' signals a syntax error and the error
+** message at the top of the stack ends with the above mark for
+** incomplete statements.
+*/
+static int incomplete(lua_State *L, int status) {
+  if (status == LUA_ERRSYNTAX) {
+    size_t lmsg;
+    const char *msg = lua_tolstring(L, -1, &lmsg);
+    if (lmsg >= marklen && strcmp(msg + lmsg - marklen, EOFMARK) == 0) {
+      lua_pop(L, 1);
+      return 1;
+    }
+  }
+  return 0; /* else... */
+}
+
+/*
+** Prompt the user, read a line, and push it into the Lua stack.
+*/
+static int pushline(lua_State *L, int firstline) {
+  char buffer[LUA_MAXINPUT];
+  char *b = buffer;
+  size_t l;
+  const char *prmt = get_prompt(L, firstline);
+  int readstatus = lua_readline(L, b, prmt);
+  if (readstatus == 0)
+    return 0;    /* no input (prompt will be popped by caller) */
+  lua_pop(L, 1); /* remove prompt */
+  l = strlen(b);
+  if (l > 0 && b[l - 1] == '\n') /* line ends with newline? */
+    b[--l] = '\0';               /* remove it */
+  if (firstline && b[0] == '=')  /* for compatibility with 5.2, ... */
+    lua_pushfstring(L, "return %s", b + 1); /* change '=' to 'return' */
+  else
+    lua_pushlstring(L, b, l);
+  lua_freeline(L, b);
+  return 1;
+}
+
+/*
+** Try to compile line on the stack as 'return <line>;'; on return, stack
+** has either compiled chunk or original line (if compilation failed).
+*/
+static int addreturn(lua_State *L) {
+  const char *line = lua_tostring(L, -1); /* original line */
+  const char *retline = lua_pushfstring(L, "return %s;", line);
+  int status = luaL_loadbuffer(L, retline, strlen(retline), "=stdin");
+  if (status == LUA_OK) {
+    lua_remove(L, -2);       /* remove modified line */
+    if (line[0] != '\0')     /* non empty? */
+      lua_saveline(L, line); /* keep history */
+  } else
+    lua_pop(L, 2); /* pop result from 'luaL_loadbuffer' and modified line */
+  return status;
+}
+
+/*
+** Read multiple lines until a complete Lua statement
+*/
+static int multiline(lua_State *L) {
+  for (;;) { /* repeat until gets a complete statement */
+    size_t len;
+    const char *line = lua_tolstring(L, 1, &len);         /* get what it has */
+    int status = luaL_loadbuffer(L, line, len, "=stdin"); /* try it */
+    if (!incomplete(L, status) || !pushline(L, 0)) {
+      lua_saveline(L, line); /* keep history */
+      return status; /* cannot or should not try to add continuation line */
+    }
+    lua_pushliteral(L, "\n"); /* add newline... */
+    lua_insert(L, -2);        /* ...between the two lines */
+    lua_concat(L, 3);         /* join them */
+  }
+}
+
+/*
+** Read a line and try to load (compile) it first as an expression (by
+** adding "return " in front of it) and second as a statement. Return
+** the final status of load/call with the resulting function (if any)
+** in the top of the stack.
+*/
+static int loadline(lua_State *L) {
+  int status;
+  lua_settop(L, 0);
+  if (!pushline(L, 1))
+    return -1;                           /* no input */
+  if ((status = addreturn(L)) != LUA_OK) /* 'return ...' did not work? */
+    status = multiline(L); /* try as command, maybe with continuation lines */
+  lua_remove(L, 1);        /* remove line from the stack */
+  lua_assert(lua_gettop(L) == 1);
+  return status;
+}
+
+/*
+** Prints (calling the Lua 'print' function) any values on the stack
+*/
+static void l_print(lua_State *L) {
+  int n = lua_gettop(L);
+  if (n > 0) { /* any result to be printed? */
+    luaL_checkstack(L, LUA_MINSTACK, "too many results to print");
+    lua_getglobal(L, "print");
+    lua_insert(L, 1);
+    if (lua_pcall(L, n, 0, 0) != LUA_OK)
+      l_message(progname, lua_pushfstring(L, "error calling 'print' (%s)",
+                                          lua_tostring(L, -1)));
+  }
+}
+
+/*
+** Do the REPL: repeatedly read (load) a line, evaluate (call) it, and
+** print any results.
+*/
+static void doREPL(lua_State *L) {
+  int status;
+  const char *oldprogname = progname;
+  progname = NULL; /* no 'progname' on errors in interactive mode */
+  while ((status = loadline(L)) != -1) {
+    if (status == LUA_OK)
+      status = docall(L, 0, LUA_MULTRET);
+    if (status == LUA_OK)
+      l_print(L);
+    else
+      report(L, status);
+  }
+  lua_settop(L, 0); /* clear stack */
+  lua_writeline();
+  progname = oldprogname;
+}
+
+/*
+** Push on the stack the contents of table 'arg' from 1 to #arg
+*/
+static int pushargs(lua_State *L) {
+  int i, n;
+  if (lua_getglobal(L, "arg") != LUA_TTABLE)
+    luaL_error(L, "'arg' is not a table");
+  n = (int)luaL_len(L, -1);
+  luaL_checkstack(L, n + 3, "too many arguments to script");
+  for (i = 1; i <= n; i++)
+    lua_rawgeti(L, -i, i);
+  lua_remove(L, -i); /* remove table from the stack */
+  return n;
+}
+
+static int handle_script(lua_State *L, char **argv) {
+  int status;
+  const char *fname = argv[0];
+  if (strcmp(fname, "-") == 0 && strcmp(argv[-1], "--") != 0)
+    fname = NULL; /* stdin */
+  status = luaL_loadfile(L, fname);
+  if (status == LUA_OK) {
+    int n = pushargs(L); /* push arguments to script */
+    status = docall(L, n, LUA_MULTRET);
+  }
+  return report(L, status);
+}
+
+/* bits of various argument indicators in 'args' */
+#define has_error 1 /* bad option */
+#define has_i 2     /* -i */
+#define has_v 4     /* -v */
+#define has_e 8     /* -e */
+#define has_E 16    /* -E */
+
+/*
+** Traverses all arguments from 'argv', returning a mask with those
+** needed before running any Lua code (or an error code if it finds
+** any invalid argument). 'first' returns the first not-handled argument
+** (either the script name or a bad argument in case of error).
+*/
+static int collectargs(char **argv, int *first) {
+  int args = 0;
+  int i;
+  for (i = 1; argv[i] != NULL; i++) {
+    *first = i;
+    if (argv[i][0] != '-')    /* not an option? */
+      return args;            /* stop handling options */
+    switch (argv[i][1]) {     /* else check option */
+    case '-':                 /* '--' */
+      if (argv[i][2] != '\0') /* extra characters after '--'? */
+        return has_error;     /* invalid option */
+      *first = i + 1;
+      return args;
+    case '\0':     /* '-' */
+      return args; /* script "name" is '-' */
+    case 'E':
+      if (argv[i][2] != '\0') /* extra characters after 1st? */
+        return has_error;     /* invalid option */
+      args |= has_E;
+      break;
+    case 'i':
+      args |= has_i; /* (-i implies -v) */ /* FALLTHROUGH */
+    case 'v':
+      if (argv[i][2] != '\0') /* extra characters after 1st? */
+        return has_error;     /* invalid option */
+      args |= has_v;
+      break;
+    case 'e':
+      args |= has_e;            /* FALLTHROUGH */
+    case 'l':                   /* both options need an argument */
+      if (argv[i][2] == '\0') { /* no concatenated argument? */
+        i++;                    /* try next 'argv' */
+        if (argv[i] == NULL || argv[i][0] == '-')
+          return has_error; /* no next argument or it is another option */
+      }
+      break;
+    default: /* invalid option */
+      return has_error;
+    }
+  }
+  *first = i; /* no script name */
+  return args;
+}
+
+/*
+** Processes options 'e' and 'l', which involve running Lua code.
+** Returns 0 if some code raises an error.
+*/
+static int runargs(lua_State *L, char **argv, int n) {
+  int i;
+  for (i = 1; i < n; i++) {
+    int option = argv[i][1];
+    lua_assert(argv[i][0] == '-'); /* already checked */
+    if (option == 'e' || option == 'l') {
+      int status;
+      const char *extra = argv[i] + 2; /* both options need an argument */
+      if (*extra == '\0')
+        extra = argv[++i];
+      lua_assert(extra != NULL);
+      status = (option == 'e') ? dostring(L, extra, "=(command line)")
+                               : dolibrary(L, extra);
+      if (status != LUA_OK)
+        return 0;
+    }
+  }
+  return 1;
+}
+
+static int handle_luainit(lua_State *L) {
+  const char *name = "=" LUA_INITVARVERSION;
+  const char *init = getenv(name + 1);
+  if (init == NULL) {
+    name = "=" LUA_INIT_VAR;
+    init = getenv(name + 1); /* try alternative name */
+  }
+  if (init == NULL)
+    return LUA_OK;
+  else if (init[0] == '@')
+    return dofile(L, init + 1);
+  else
+    return dostring(L, init, name);
+}
+
+/*
+** Main body of stand-alone interpreter (to be called in protected mode).
+** Reads the options and handles them all.
+*/
+static int pmain(lua_State *L) {
+  int argc = (int)lua_tointeger(L, 1);
+  char **argv = (char **)lua_touserdata(L, 2);
+  int script;
+  int args = collectargs(argv, &script);
+  luaL_checkversion(L); /* check that interpreter has correct version */
+  if (argv[0] && argv[0][0])
+    progname = argv[0];
+  if (args == has_error) {     /* bad arg? */
+    print_usage(argv[script]); /* 'script' has index of bad arg. */
+    return 0;
+  }
+  if (args & has_v) /* option '-v'? */
+    print_version();
+  if (args & has_E) {      /* option '-E'? */
+    lua_pushboolean(L, 1); /* signal for libraries to ignore env. vars. */
+    lua_setfield(L, LUA_REGISTRYINDEX, "LUA_NOENV");
+  }
+  luaL_openlibs(L);                      /* open standard libraries */
+  createargtable(L, argv, argc, script); /* create table 'arg' */
+  if (!(args & has_E)) {                 /* no option '-E'? */
+    if (handle_luainit(L) != LUA_OK)     /* run LUA_INIT */
+      return 0;                          /* error running LUA_INIT */
+  }
+  if (!runargs(L, argv, script)) /* execute arguments -e and -l */
+    return 0;                    /* something failed */
+  if (script < argc &&           /* execute main script (if there is one) */
+      handle_script(L, argv + script) != LUA_OK)
+    return 0;
+  if (args & has_i) /* -i option? */
+    doREPL(L);      /* do read-eval-print loop */
+  else if (script == argc && !(args & (has_e | has_v))) { /* no arguments? */
+    if (lua_stdin_is_tty()) { /* running in interactive mode? */
+      print_version();
+      doREPL(L); /* do read-eval-print loop */
+    } else
+      dofile(L, NULL); /* executes stdin as a file */
+  }
+  lua_pushboolean(L, 1); /* signal no errors */
+  return 1;
+}
+
+int main(int argc, char **argv) {
+  int status, result;
+  lua_State *L = luaL_newstate(); /* create state */
+  if (L == NULL) {
+    l_message(argv[0], "cannot create state: not enough memory");
+    return EXIT_FAILURE;
+  }
+  reg_tablegen_tables(L);
+  lua_pushcfunction(L, &pmain);   /* to call 'pmain' in protected mode */
+  lua_pushinteger(L, argc);       /* 1st argument */
+  lua_pushlightuserdata(L, argv); /* 2nd argument */
+  status = lua_pcall(L, 2, 1, 0); /* do the call */
+  result = lua_toboolean(L, -1);  /* get result */
+  report(L, status);
+  lua_close(L);
+  return (result && status == LUA_OK) ? EXIT_SUCCESS : EXIT_FAILURE;
+}