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Disable standalone executable support under WASM / Emscripten #1528

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Merged
saghul merged 1 commit into from
Jun 10, 2026
+29 −19
Merged

Disable standalone executable support under WASM / Emscripten #1528

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48 changes: 29 additions & 19 deletions qjs.c
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Original file line number Diff line number Diff line change
Expand Up @@ -45,16 +45,23 @@ extern const uint32_t qjsc_repl_size;
extern const uint8_t qjsc_standalone[];
extern const uint32_t qjsc_standalone_size;

#if defined(EMSCRIPTEN) || defined(__wasi__)
// Standalone executables (the --compile option and detecting/running an
// executable with appended bytecode) can't work in these environments.
#define emscripten_or_wasi 1
#else
#define emscripten_or_wasi 0
#endif

static int qjs__argc;
static char **qjs__argv;

// Must match standalone.js
#define TRAILER_SIZE 12
static const char trailer_magic[] = "quickjs2";
static const int trailer_magic_size = sizeof(trailer_magic) - 1;
static const int trailer_size = TRAILER_SIZE;

static int qjs__argc;
static char **qjs__argv;


static bool is_standalone(const char *exe)
{
FILE *exe_f = fopen(exe, "rb");
Expand Down Expand Up @@ -386,32 +393,34 @@ void help(int exit_status)
" --std make 'std', 'os' and 'bjson' available to script\n"
"-T --trace trace memory allocation\n"
"-d --dump dump the memory usage stats\n"
"-D --dump-flags flags for dumping debug data (see DUMP_* defines)\n"
"-c --compile FILE compile the given JS file as a standalone executable\n"
"-o --out FILE output file for standalone executables\n"
" --exe select the executable to use as the base, defaults to the current one\n"
" --memory-limit n limit the memory usage to 'n' Kbytes\n"
"-D --dump-flags flags for dumping debug data (see DUMP_* defines)\n",
JS_GetVersion());
if (!emscripten_or_wasi)
printf("-c --compile FILE compile the given JS file as a standalone executable\n"
"-o --out FILE output file for standalone executables\n"
" --exe select the executable to use as the base, defaults to the current one\n");
printf(" --memory-limit n limit the memory usage to 'n' Kbytes\n"
" --stack-size n limit the stack size to 'n' Kbytes\n"
"-q --quit just instantiate the interpreter and quit\n", JS_GetVersion());
"-q --quit just instantiate the interpreter and quit\n");
exit(exit_status);
}

int main(int argc, char **argv)
{
JSRuntime *rt;
JSContext *ctx;
JSValue ret = JS_UNDEFINED;
struct trace_malloc_data trace_data = { NULL };
int r = 0;
int optind = 1;
JSValue ret = JS_UNDEFINED;
char exebuf[JS__PATH_MAX];
size_t exebuf_size = sizeof(exebuf);
char *compile_file = NULL;
char *exe = NULL;
char *expr = NULL;
char *dump_flags_str = NULL;
char *out = NULL;
int standalone = 0;
char *expr = NULL;
char *dump_flags_str = NULL;
int interactive = 0;
int dump_memory = 0;
int dump_flags = 0;
Expand All @@ -429,8 +438,8 @@ int main(int argc, char **argv)
qjs__argv = argv;

/* check if this is a standalone executable */

if (!js_exepath(exebuf, &exebuf_size) && is_standalone(exebuf)) {
if (!emscripten_or_wasi &&
!js_exepath(exebuf, &exebuf_size) && is_standalone(exebuf)) {
standalone = 1;
goto start;
}
Expand Down Expand Up @@ -549,7 +558,8 @@ int main(int argc, char **argv)
stack_size = parse_limit(optarg);
break;
}
if (opt == 'c' || !strcmp(longopt, "compile")) {
if (!emscripten_or_wasi &&
(opt == 'c' || !strcmp(longopt, "compile"))) {
if (!optarg) {
if (optind >= argc) {
fprintf(stderr, "qjs: missing file for -c\n");
Expand All @@ -560,7 +570,7 @@ int main(int argc, char **argv)
compile_file = optarg;
break;
}
if (opt == 'o' || !strcmp(longopt, "out")) {
if (!emscripten_or_wasi && (opt == 'o' || !strcmp(longopt, "out"))) {
if (!optarg) {
if (optind >= argc) {
fprintf(stderr, "qjs: missing file for -o\n");
Expand All @@ -571,7 +581,7 @@ int main(int argc, char **argv)
out = optarg;
break;
}
if (!strcmp(longopt, "exe")) {
if (!emscripten_or_wasi && !strcmp(longopt, "exe")) {
if (!optarg) {
if (optind >= argc) {
fprintf(stderr, "qjs: missing file for --exe\n");
Expand All @@ -591,7 +601,7 @@ int main(int argc, char **argv)
}
}

if (compile_file && !out)
if (!emscripten_or_wasi && compile_file && !out)
help(1);

start:
Expand Down
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