refactor: Clarify initialize globals

runtime/include/awsm_abi.h

@@ -48,12 +48,12 @@ awsm_abi_init(struct awsm_abi *abi, char *path)
 		goto dl_error;
 	}
 
+	/*
+	 * This symbol may or may not be present depending on whether the aWsm was
+	 * run with the --runtime-globals flag. It is not clear what the proper
+	 * configuration would be for SLEdge, so no validation is performed
+	 */
 	abi->initialize_globals = (awsm_abi_init_globals_fn_t)dlsym(abi->handle, AWSM_ABI_INITIALIZE_GLOBALS);
-	if (abi->initialize_globals == NULL) {
-		fprintf(stderr, "Failed to resolve symbol %s in %s with error: %s\n", AWSM_ABI_INITIALIZE_GLOBALS, path,
-		        dlerror());
-		goto dl_error;
-	}
 
 	abi->initialize_memory = (awsm_abi_init_mem_fn_t)dlsym(abi->handle, AWSM_ABI_INITIALIZE_MEMORY);
 	if (abi->initialize_memory == NULL) {

runtime/include/module.h

@@ -76,13 +76,14 @@ module_acquire(struct module *module)
 }
 
 /**
- * Invoke a module's initialize_globals
+ * Invoke a module's initialize_globals if the symbol was present in the *.so file.
+ * This is present when aWsm is run with the --runtime-globals flag and absent otherwise.
  * @param module
  */
 static inline void
 module_initialize_globals(struct module *module)
 {
-	module->abi.initialize_globals();
+	if (module->abi.initialize_globals != NULL) module->abi.initialize_globals();
 }
 
 /**