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main.cpp
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main.cpp
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/* See Copyright Notice in ../LICENSE.txt */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#ifdef _WIN32
#include <io.h>
#include "ext/getopt.h"
#define isatty(x) _isatty(x)
#include "twindows.h"
#else
#include <signal.h>
#include <getopt.h>
#include <unistd.h>
#endif
#include "terra.h"
static void doerror(lua_State *L) {
fprintf(stderr, "%s\n", luaL_checkstring(L, -1));
lua_close(L);
terra_llvmshutdown();
exit(1);
}
const char *progname = NULL;
static void dotty(lua_State *L);
void parse_args(lua_State *L, int argc, char **argv, terra_Options *options,
bool *interactive, int *begin_script);
static int getargs(lua_State *L, char **argv, int n);
static int docall(lua_State *L, int narg, int clear);
static void (*terratraceback)(void *);
#ifndef _WIN32
void sigsegv(int sig, siginfo_t *info, void *uap) {
signal(sig,
SIG_DFL); // reset signal to default, just in case traceback itself crashes
terratraceback(uap); // call terra's pretty traceback
raise(sig); // rethrow the signal to the default handler
}
void registerhandler() {
struct sigaction sa;
sa.sa_flags = SA_RESETHAND | SA_SIGINFO;
sigemptyset(&sa.sa_mask);
sa.sa_sigaction = sigsegv;
sigaction(SIGSEGV, &sa, NULL);
sigaction(SIGILL, &sa, NULL);
}
#else
LONG WINAPI windowsheapcorruptionhandler(EXCEPTION_POINTERS *ExceptionInfo) {
if (ExceptionInfo->ExceptionRecord->ExceptionCode == STATUS_HEAP_CORRUPTION) {
// The traceback is often useless, so make it clear what happened
printf("Heap corruption detected!\n");
terratraceback(ExceptionInfo->ContextRecord);
fflush(stdout);
TerminateProcess(GetCurrentProcess(),
ExceptionInfo->ExceptionRecord->ExceptionCode);
}
return EXCEPTION_CONTINUE_SEARCH;
}
LONG WINAPI windowsexceptionhandler(EXCEPTION_POINTERS *ExceptionInfo) {
terratraceback(ExceptionInfo->ContextRecord);
return EXCEPTION_EXECUTE_HANDLER;
}
void registerhandler() {
// https://peteronprogramming.wordpress.com/2017/07/30/crashes-you-cant-handle-easily-3-status_heap_corruption-on-windows/
AddVectoredExceptionHandler(1, windowsheapcorruptionhandler);
SetUnhandledExceptionFilter(windowsexceptionhandler);
}
#endif
void setupcrashsignal(lua_State *L) {
lua_getglobal(L, "terralib");
lua_getfield(L, -1, "traceback");
const void *tb = lua_topointer(L, -1);
if (!tb) return; // debug not supported
terratraceback = *(void (*const *)(void *))tb;
registerhandler();
lua_pop(L, 2);
}
static int luapanic(
lua_State *L) { // so that we can set a debugger breakpoint and catch the error
printf("PANIC: unprotected error in call to Lua API (%s)\n", lua_tostring(L, -1));
exit(1);
}
int main(int argc, char **argv) {
progname = argv[0];
lua_State *L = luaL_newstate();
luaL_openlibs(L);
lua_atpanic(L, luapanic);
terra_Options options;
memset(&options, 0, sizeof(terra_Options));
bool interactive = false;
int scriptidx;
parse_args(L, argc, argv, &options, &interactive, &scriptidx);
if (terra_initwithoptions(L, &options)) doerror(L);
setupcrashsignal(L);
if (options.cmd_line_chunk != NULL) {
if (terra_dostring(L, options.cmd_line_chunk)) doerror(L);
free(options.cmd_line_chunk);
}
if (scriptidx < argc) {
int narg = getargs(L, argv, scriptidx);
lua_setglobal(L, "arg");
const char *filename = argv[scriptidx];
if (!strcmp(filename, "-")) filename = NULL;
if (terra_loadfile(L, filename)) doerror(L);
lua_insert(L, -(narg + 1));
if (docall(L, narg, 0)) doerror(L);
}
if (isatty(0) && (interactive || (scriptidx == argc && !options.cmd_line_chunk))) {
progname = NULL;
dotty(L);
}
lua_close(L);
terra_llvmshutdown();
return 0;
}
static void print_welcome();
void usage() {
print_welcome();
printf("terra [OPTIONS] [source-file] [arguments-to-source-file]\n"
" -v enable verbose debugging output\n"
" -g enable debugging symbols\n"
" -h print this help message\n"
" -i enter the REPL after processing source files\n"
" -e 'chunk' : execute command-line 'chunk' of code\n"
" - Execute stdin instead of script and stop parsing options\n");
}
void parse_args(lua_State *L, int argc, char **argv, terra_Options *options,
bool *interactive, int *begin_script) {
int ch;
static struct option longopts[] = {{"help", 0, NULL, 'h'},
{"verbose", 0, NULL, 'v'},
{"debugsymbols", 0, NULL, 'g'},
{"interactive", 0, NULL, 'i'},
{"execute", required_argument, NULL, 'e'},
{NULL, 0, NULL, 0}};
/* Parse commandline options */
opterr = 0;
while ((ch = getopt_long(argc, argv, "+hvgie:p:", longopts, NULL)) != -1) {
switch (ch) {
case 'v':
options->verbose++;
break;
case 'i':
*interactive = true;
break;
case 'g':
options->debug++;
break;
case 'e':
options->cmd_line_chunk = (char *)malloc(strlen(optarg) + 1);
strcpy(options->cmd_line_chunk, optarg);
break;
case ':':
case 'h':
default:
usage();
exit(-1);
break;
}
}
*begin_script = optind;
}
// this stuff is from lua's lua.c repl implementation:
#ifndef _WIN32
#include "linenoise.h"
#define lua_readline(L, b, p) ((void)L, ((b) = linenoise(p)) != NULL)
#define lua_saveline(L, idx) \
if (lua_strlen(L, idx) > 0) /* non-empty line? */ \
linenoiseHistoryAdd(lua_tostring(L, idx)); /* add it to history */
#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, idx) \
{ \
(void)L; \
(void)idx; \
}
#define lua_freeline(L, b) \
{ \
(void)L; \
(void)b; \
}
#endif
static void l_message(const char *pname, const char *msg) {
if (pname) fprintf(stderr, "%s: ", pname);
fprintf(stderr, "%s\n", msg);
fflush(stderr);
}
static int report(lua_State *L, int status) {
if (status && !lua_isnil(L, -1)) {
const char *msg = lua_tostring(L, -1);
if (msg == NULL) msg = "(error object is not a string)";
l_message(progname, msg);
lua_pop(L, 1);
}
return status;
}
static int incomplete(lua_State *L, int status) {
if (status == LUA_ERRSYNTAX) {
size_t lmsg;
const char *msg = lua_tolstring(L, -1, &lmsg);
const char *tp = msg + lmsg - (sizeof("'<eof>'") - 1);
if (strstr(msg, "'<eof>'") == tp) {
lua_pop(L, 1);
return 1;
}
}
return 0; /* else... */
}
static int getargs(lua_State *L, char **argv, int n) {
int narg;
int i;
int argc = 0;
while (argv[argc]) argc++; /* count total number of arguments */
narg = argc - (n + 1); /* number of arguments to the script */
luaL_checkstack(L, narg + 3, "too many arguments to script");
for (i = n + 1; i < argc; i++) lua_pushstring(L, argv[i]);
lua_createtable(L, narg, n + 1);
for (i = 0; i < argc; i++) {
lua_pushstring(L, argv[i]);
lua_rawseti(L, -2, i - n);
}
return narg;
}
#define LUA_MAXINPUT 512
#define LUA_PROMPT "> "
#define LUA_PROMPT2 ">> "
static const char *get_prompt(lua_State *L, int firstline) {
const char *p;
lua_getfield(L, LUA_GLOBALSINDEX, firstline ? "_PROMPT" : "_PROMPT2");
p = lua_tostring(L, -1);
if (p == NULL) p = (firstline ? LUA_PROMPT : LUA_PROMPT2);
lua_pop(L, 1); /* remove global */
return p;
}
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);
if (lua_readline(L, b, prmt) == 0) return 0; /* no input */
l = strlen(b);
if (l > 0 && b[l - 1] == '\n') /* line ends with newline? */
b[l - 1] = '\0'; /* remove it */
if (firstline && b[0] == '=') /* first line starts with `=' ? */
lua_pushfstring(L, "return %s", b + 1); /* change it to `return' */
else
lua_pushstring(L, b);
lua_saveline(L, -1);
lua_freeline(L, b);
return 1;
}
static int loadline(lua_State *L) {
int status;
lua_settop(L, 0);
if (!pushline(L, 1)) return -1; /* no input */
for (;;) { /* repeat until gets a complete line */
status = terra_loadbuffer(L, lua_tostring(L, 1), lua_strlen(L, 1), "stdin");
if (!incomplete(L, status)) break; /* cannot try to add lines? */
if (!pushline(L, 0)) /* no more input? */
return -1;
lua_pushliteral(L, "\n"); /* add a new line... */
lua_insert(L, -2); /* ...between the two lines */
lua_concat(L, 3); /* join them */
}
lua_remove(L, 1); /* remove line */
return status;
}
static int traceback(lua_State *L) {
if (!lua_isstring(L, 1)) /* 'message' not a string? */
return 1; /* keep it intact */
lua_getfield(L, LUA_GLOBALSINDEX, "debug");
if (!lua_istable(L, -1)) {
lua_pop(L, 1);
return 1;
}
lua_getfield(L, -1, "traceback");
if (!lua_isfunction(L, -1)) {
lua_pop(L, 2);
return 1;
}
lua_pushvalue(L, 1); /* pass error message */
lua_pushinteger(L, 2); /* skip this function and traceback */
lua_call(L, 2, 1); /* call debug.traceback */
return 1;
}
static lua_State *globalL = NULL;
static void lstop(lua_State *L, lua_Debug *ar) {
(void)ar; /* unused arg. */
lua_sethook(L, NULL, 0, 0);
luaL_error(L, "interrupted!");
}
static void laction(int i) {
signal(i, SIG_DFL); /* if another SIGINT happens before lstop,
terminate process (default action) */
lua_sethook(globalL, lstop, LUA_MASKCALL | LUA_MASKRET | LUA_MASKCOUNT, 1);
}
static int docall(lua_State *L, int narg, int clear) {
int status;
globalL = L;
int base = lua_gettop(L) - narg; /* function index */
lua_pushcfunction(L, traceback); /* push traceback function */
lua_insert(L, base); /* put it under chunk and args */
signal(SIGINT, laction);
status = lua_pcall(L, narg, (clear ? 0 : LUA_MULTRET), base);
signal(SIGINT, SIG_DFL);
lua_remove(L, base); /* remove traceback function */
/* force a complete garbage collection in case of errors */
if (status != 0) lua_gc(L, LUA_GCCOLLECT, 0);
return status;
}
static void print_welcome() {
printf("\n"
"Terra -- A low-level counterpart to Lua\n"
"Release " TERRA_VERSION_STRING
"\n"
"\n"
"Homepage: https://terralang.org/\n"
"Project: https://github.com/terralang/terra\n"
"Community: https://terralang.zulipchat.com/\n"
"\n");
}
static void dotty(lua_State *L) {
int status;
print_welcome();
while ((status = loadline(L)) != -1) {
if (status == 0) status = docall(L, 0, 0);
report(L, status);
if (status == 0 && lua_gettop(L) > 0) { /* any result to print? */
lua_getglobal(L, "print");
lua_insert(L, 1);
if (lua_pcall(L, lua_gettop(L) - 1, 0, 0) != 0)
lua_pushfstring(L, "error calling " LUA_QL("print") " (%s)",
lua_tostring(L, -1));
report(L, status);
}
}
lua_settop(L, 0); /* clear stack */
fputs("\n", stdout);
fflush(stdout);
}
#if 0
//a much simpler main function:
#include <stdio.h>
#include "terra.h"
static void doerror(lua_State * L) {
printf("%s\n",luaL_checkstring(L,-1));
exit(1);
}
int main(int argc, char ** argv) {
lua_State * L = luaL_newstate();
luaL_openlibs(L);
if(terra_init(L))
doerror(L);
for(int i = 1; i < argc; i++)
if(terra_dofile(L,argv[i]))
doerror(L);
return 0;
}
#endif