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* Main entry point into the Rust runtime. Here we initialize the kernel,
* create the initial scheduler and run the main task.
#include "rust_globals.h"
#include "rust_kernel.h"
#include "rust_util.h"
#include "rust_scheduler.h"
#include "rust_gc_metadata.h"
// Creates a rust argument vector from the platform argument vector
command_line_args : public kernel_owned<command_line_args>
rust_kernel *kernel;
rust_task *task;
int argc;
char **argv;
// [str] passed to rust_task::start.
rust_vec_box *args;
command_line_args(rust_task *task,
int sys_argc,
char **sys_argv)
: kernel(task->kernel),
#if defined(__WIN32__)
LPCWSTR cmdline = GetCommandLineW();
LPWSTR *wargv = CommandLineToArgvW(cmdline, &argc);
kernel->win32_require("CommandLineToArgvW", wargv != NULL);
argv = (char **) kernel->malloc(sizeof(char*) * argc,
"win32 command line");
for (int i = 0; i < argc; ++i) {
int n_chars = WideCharToMultiByte(CP_UTF8, 0, wargv[i], -1,
kernel->win32_require("WideCharToMultiByte(0)", n_chars != 0);
argv[i] = (char *) kernel->malloc(n_chars,
"win32 command line arg");
n_chars = WideCharToMultiByte(CP_UTF8, 0, wargv[i], -1,
argv[i], n_chars, NULL, NULL);
kernel->win32_require("WideCharToMultiByte(1)", n_chars != 0);
args = make_str_vec(kernel, argc, argv);
~command_line_args() {
for (int i = 0; i < argc; ++i) {
rust_vec *s = ((rust_vec**)&args->[i];
#ifdef __WIN32__
for (int i = 0; i < argc; ++i) {
// A global that indicates whether Rust typestate claim statements should be
// executed Generated code will read this variable directly (I think).
// FIXME (#2670): This belongs somewhere else
int check_claims = 0;
void* global_crate_map = NULL;
The runtime entrypoint. The (C ABI) main function generated by rustc calls
`rust_start`, providing the address of the Rust ABI main function, the
platform argument vector, and a `crate_map` the provides some logging
extern "C" CDECL int
rust_start(uintptr_t main_fn, int argc, char **argv, void* crate_map) {
// Load runtime configuration options from the environment.
// FIXME #1497: Should provide a way to get these from the command
// line as well.
rust_env *env = load_env();
global_crate_map = crate_map;
update_log_settings(crate_map, env->logspec);
// Maybe turn on typestate claim checking
check_claims = env->check_claims;
rust_kernel *kernel = new rust_kernel(env);
// Create the main scheduler and the main task
rust_sched_id sched_id = kernel->create_scheduler(env->num_sched_threads);
rust_scheduler *sched = kernel->get_scheduler_by_id(sched_id);
assert(sched != NULL);
rust_task *root_task = sched->create_task(NULL, "main");
// Build the command line arguments to pass to the root task
command_line_args *args
= new (kernel, "main command line args")
command_line_args(root_task, argc, argv);
LOG(root_task, dom, "startup: %d args in 0x%" PRIxPTR,
args->argc, (uintptr_t)args->args);
for (int i = 0; i < args->argc; i++) {
LOG(root_task, dom, "startup: arg[%d] = '%s'", i, args->argv[i]);
// Schedule the main Rust task
root_task->start((spawn_fn)main_fn, NULL, args->args);
// At this point the task lifecycle is responsible for it
// and our pointer may not be valid
root_task = NULL;
// Run the kernel until all schedulers exit
int ret = kernel->run();
delete args;
delete kernel;
return ret;
// Local Variables:
// mode: C++
// fill-column: 78;
// indent-tabs-mode: nil
// c-basic-offset: 4
// buffer-file-coding-system: utf-8-unix
// End:
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