refactor runtime init and exit code

1 files changed, 15 insertions, 1 deletions

diff --git a/src/preamble_sharedlib.js b/src/preamble_sharedlib.js
index 4b91c44c..2a071f6b 100644
--- a/src/preamble_sharedlib.js
+++ b/src/preamble_sharedlib.js
@@ -4,7 +4,21 @@
 // Runtime essentials
 //========================================
 
-var __globalConstructor__ = function globalConstructor() {
+function callRuntimeCallbacks(callbacks) {
+  while(callbacks.length > 0) {
+    var callback = callbacks.pop();
+    var func = callback.func;
+    if (typeof func === 'number') {
+      func = FUNCTION_TABLE[func];
+    }
+    func(callback.arg === undefined ? null : callback.arg);
+  }
+}
+
+var __ATINIT__ = []; // functions called during startup
+
+function initRuntime() {
+  callRuntimeCallbacks(__ATINIT__);
 }
 
 // === Body ===