added list-driver option

src/cfg/opt.c

@@ -268,6 +268,7 @@ void print_help(void) {
         "    --debug          print debug logs (if not disabled at compile time)",
         "    --version        print the version",
         "    --list-targets   print a list of all available targets supported",
+        "    --list-driver    print a list of all available binary driver",
         "    --help           print this help dialog",
         "    --color-always   always colorize output",
         "    --print-gc-stats print statistics of the garbage collector"

src/compiler.c

@@ -356,8 +356,6 @@ static void build_project(ModuleFileStack *unit) {
 void run_compiler() {
     ModuleFileStack files = new_file_stack();
 
-    link_init();
-
     if (is_option_set("build")) {
         build_project(&files);
     } else if (is_option_set("compile")) {

src/link/lib.c

@@ -21,9 +21,17 @@ void link_init() {
 
         for (unsigned long int i = 0; i < sizeof(AVAILABLE_DRIVER)/sizeof(driver_init); i++) {
             BinaryDriver* driver = AVAILABLE_DRIVER[i]();
+
+            if (driver == NULL) {
+                ERROR("failed to init driver by index: %d", i);
+                continue;
+            }
+
             g_hash_table_insert(binary_driver, (gpointer) driver->name, driver);
             INFO("initialized `%s` driver", driver->name);
         }
+    } else {
+        PANIC("binary driver already initialized");
     }
 }
 
@@ -45,3 +53,16 @@ bool link_run(TargetLinkConfig* config) {
         return false;
     }
 }
+
+void link_print_available_driver() {
+    printf("Available binary driver:\n");
+
+    GHashTableIter iter;
+    gpointer key, value;
+    g_hash_table_iter_init(&iter, binary_driver);
+
+    while (g_hash_table_iter_next(&iter, &key, &value)) {
+
+        printf(" - %s\n", (char*) key);
+    }
+}

src/link/lib.h

@@ -13,4 +13,6 @@ void link_init();
 
 bool link_run(TargetLinkConfig*);
 
+void link_print_available_driver();
+
 #endif //GEMSTONE_LIB_H

src/main.c

@@ -7,6 +7,7 @@
 #include <compiler.h>
 #include <llvm/parser.h>
 #include <mem/cache.h>
+#include <link/lib.h>
 
 /**
  * @brief Log a debug message to inform about beginning exit procedures
@@ -38,6 +39,8 @@ void setup(int argc, char *argv[]) {
 
     lex_init();
 
+    link_init();
+
     DEBUG("finished starting up gemstone...");
 }
 
@@ -64,6 +67,11 @@ int main(int argc, char *argv[]) {
         exit(0);
     }
 
+    if (is_option_set("list-driver")) {
+        link_print_available_driver();
+        exit(0);
+    }
+
     run_compiler();
 
     if (is_option_set("print-gc-stats")) {