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v/vlib/compiler/live.v

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module compiler
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import (
os
time
)
fn (v &V) generate_hotcode_reloading_compiler_flags() []string {
mut a := []string
if v.pref.is_live || v.pref.is_so {
// See 'man dlopen', and test running a GUI program compiled with -live
if v.pref.os == .linux || os.user_os() == 'linux' {
a << '-rdynamic'
}
if v.pref.os == .mac || os.user_os() == 'mac' {
a << '-flat_namespace'
}
}
return a
}
fn (v &V) generate_hotcode_reloading_declarations() {
mut cgen := v.cgen
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if v.pref.os != .windows {
if v.pref.is_so {
cgen.genln('pthread_mutex_t live_fn_mutex;')
}
if v.pref.is_live {
cgen.genln('pthread_mutex_t live_fn_mutex = PTHREAD_MUTEX_INITIALIZER;')
}
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}
else {
if v.pref.is_so {
cgen.genln('HANDLE live_fn_mutex;')
cgen.genln('
void pthread_mutex_lock(HANDLE *m) {
WaitForSingleObject(*m, INFINITE);
}
void pthread_mutex_unlock(HANDLE *m) {
ReleaseMutex(*m);
}')
}
if v.pref.is_live {
cgen.genln('HANDLE live_fn_mutex = 0;')
}
}
}
fn (v &V) generate_hotcode_reloading_main_caller() {
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if !v.pref.is_live {
return
}
// We are in live code reload mode, so start the .so loader in the background
mut cgen := v.cgen
cgen.genln('')
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file_base := os.file_name(v.pref.path).replace('.v', '')
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if v.pref.os != .windows {
// unix:
so_name := file_base + '.so'
cgen.genln(' char *live_library_name = "$so_name";')
cgen.genln(' load_so(live_library_name);')
cgen.genln(' pthread_t _thread_so;')
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cgen.genln(' pthread_create(&_thread_so , NULL, (void *)&reload_so, live_library_name);')
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}
else {
// windows:
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so_name := file_base + if v.pref.ccompiler == 'msvc' { '.dll' } else { '.so' }
cgen.genln(' char *live_library_name = "$so_name";')
cgen.genln(' live_fn_mutex = CreateMutexA(0, 0, 0);')
cgen.genln(' load_so(live_library_name);')
cgen.genln(' unsigned long _thread_so;')
cgen.genln(' _thread_so = CreateThread(0, 0, (LPTHREAD_START_ROUTINE)&reload_so, 0, 0, 0);')
}
}
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fn (v &V) generate_hot_reload_code() {
mut cgen := v.cgen
// Hot code reloading
if v.pref.is_live {
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mut file := os.real_path(v.pref.path)
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file_base := os.file_name(file).replace('.v', '')
so_name := file_base + '.so'
// Need to build .so file before building the live application
// The live app needs to load this .so file on initialization.
mut vexe := os.args[0]
if os.user_os() == 'windows' {
vexe = cescaped_path(vexe)
file = cescaped_path(file)
}
mut msvc := ''
if v.pref.ccompiler == 'msvc' {
msvc = '-cc msvc'
}
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so_debug_flag := if v.pref.is_debug { '-g' } else { '' }
cmd_compile_shared_library := '$vexe $msvc $so_debug_flag -o $file_base -solive -shared $file'
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if v.pref.verbosity.is_higher_or_equal(.level_one) {
println(cmd_compile_shared_library)
}
ticks := time.ticks()
so_compilation_result := os.system(cmd_compile_shared_library)
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if v.pref.verbosity.is_higher_or_equal(.level_two) {
diff := time.ticks() - ticks
println('compiling shared library took $diff ms')
println('=========\n')
}
if so_compilation_result != 0 {
exit(1)
}
cgen.genln('
void lfnmutex_print(char *s){
#if 0
fflush(stderr);
fprintf(stderr,">> live_fn_mutex: %p | %s\\n", &live_fn_mutex, s);
fflush(stderr);
#endif
}
')
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if v.pref.os != .windows {
cgen.genln('
#define _POSIX_C_SOURCE 1
#include <limits.h>
#ifndef PATH_MAX
#define PATH_MAX 1024
#endif
void* live_lib = 0;
int load_so(byteptr path) {
char cpath[PATH_MAX] = {0};
int res = snprintf(cpath, sizeof (cpath), "./%s", path);
if (res >= sizeof (cpath)) {
fprintf (stderr, "path is too long");
return 0;
}
//printf("load_so %s\\n", cpath);
if (live_lib) dlclose(live_lib);
live_lib = dlopen(cpath, RTLD_LAZY);
if (!live_lib) {
fprintf(stderr, "open failed");
exit(1);
return 0;
}
')
for so_fn in cgen.so_fns {
cgen.genln('$so_fn = dlsym(live_lib, "$so_fn"); ')
}
}
else {
cgen.genln('
#ifndef PATH_MAX
#define PATH_MAX 1024
#endif
void pthread_mutex_lock(HANDLE *m) {
WaitForSingleObject(*m, INFINITE);
}
void pthread_mutex_unlock(HANDLE *m) {
ReleaseMutex(*m);
}
void* live_lib = NULL;
int load_so(byteptr path) {
char cpath[PATH_MAX];
int res = snprintf(cpath, sizeof (cpath), "./%s", path);
if (res >= sizeof(cpath)) {
puts("path is too long\\n");
exit(1);
return 0;
}
if (live_lib) FreeLibrary(live_lib);
live_lib = LoadLibraryA(cpath);
if (!live_lib) {
puts("open failed\\n");
exit(1);
return 0;
}
')
for so_fn in cgen.so_fns {
cgen.genln('$so_fn = (void *)GetProcAddress(live_lib, "$so_fn"); ')
}
}
cgen.genln('return 1;
}
int _live_reloads = 0;
void reload_so() {
char new_so_base[PATH_MAX] = {0};
char new_so_name[PATH_MAX] = {0};
char compile_cmd[PATH_MAX] = {0};
int last = os__file_last_mod_unix(tos2("$file"));
while (1) {
// TODO use inotify
int now = os__file_last_mod_unix(tos2("$file"));
if (now != last) {
last = now;
_live_reloads++;
//v -o bounce -shared bounce.v
snprintf(new_so_base, sizeof (new_so_base), ".tmp.%d.${file_base}", _live_reloads);
#ifdef _WIN32
// We have to make this directory becuase windows WILL NOT
// do it for us
os__mkdir(string_all_before_last(tos2(new_so_base), tos2("/")));
#endif
#ifdef _MSC_VER
snprintf(new_so_name, sizeof (new_so_name), "%s.dll", new_so_base);
#else
snprintf(new_so_name, sizeof (new_so_name), "%s.so", new_so_base);
#endif
snprintf(compile_cmd, sizeof (compile_cmd), "$vexe $msvc -o %s -solive -shared $file", new_so_base);
os__system(tos2(compile_cmd));
if( !os__exists(tos2(new_so_name)) ) {
puts("Errors while compiling $file\\n");
continue;
}
lfnmutex_print("reload_so locking...");
pthread_mutex_lock(&live_fn_mutex);
lfnmutex_print("reload_so locked");
load_so(new_so_name);
#ifndef _WIN32
unlink(new_so_name); // removing the .so file from the filesystem after dlopen-ing it is safe, since it will still be mapped in memory.
#else
_unlink(new_so_name);
#endif
//if(0 == rename(new_so_name, "${so_name}")){
// load_so("${so_name}");
//}
lfnmutex_print("reload_so unlocking...");
pthread_mutex_unlock(&live_fn_mutex);
lfnmutex_print("reload_so unlocked");
}
time__sleep_ms(100);
}
}
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')
}
if v.pref.is_so {
cgen.genln(' int load_so(byteptr path) { return 0; }')
}
}