Remove unused argument in wasm_runtime_lookup_function and refactor WASMModuleInstance (#3218)

Remove the unused parameter `signature` from `wasm_runtime_lookup_function`.

Refactor the layout of WASMModuleInstance structure:
- move common data members `c_api_func_imports` and `cur_exec_env` from
  `WASMModuleInstanceExtraCommon` to `WASMModuleInstance`
- In `WASMModuleInstance`, enlarge `reserved[3]` to `reserved[5]` in case that
  we need to add more fields in the future

ps.
https://github.com/bytecodealliance/wasm-micro-runtime/issues/2530
https://github.com/bytecodealliance/wasm-micro-runtime/issues/3202

samples/basic/src/main.c

@@ -149,8 +149,7 @@ main(int argc, char *argv_main[])
         goto fail;
     }
 
-    if (!(func = wasm_runtime_lookup_function(module_inst, "generate_float",
-                                              NULL))) {
+    if (!(func = wasm_runtime_lookup_function(module_inst, "generate_float"))) {
         printf("The generate_float wasm function is not found.\n");
         goto fail;
     }
@@ -189,8 +188,8 @@ main(int argc, char *argv_main[])
     argv2[4] = 3; //  the last argument is the digits after decimal point for
                   //  converting float to string
 
-    if (!(func2 = wasm_runtime_lookup_function(module_inst, "float_to_string",
-                                               NULL))) {
+    if (!(func2 =
+              wasm_runtime_lookup_function(module_inst, "float_to_string"))) {
         printf(
             "The wasm function float_to_string wasm function is not found.\n");
         goto fail;
@@ -208,7 +207,7 @@ main(int argc, char *argv_main[])
     }
 
     wasm_function_inst_t func3 =
-        wasm_runtime_lookup_function(module_inst, "calculate", NULL);
+        wasm_runtime_lookup_function(module_inst, "calculate");
     if (!func3) {
         printf("The wasm function calculate is not found.\n");
         goto fail;

samples/inst-context/src/main.c

@@ -128,7 +128,7 @@ main(int argc, char *argv_main[])
     }
 
     wasm_function_inst_t func3 =
-        wasm_runtime_lookup_function(module_inst, "calculate", NULL);
+        wasm_runtime_lookup_function(module_inst, "calculate");
     if (!func3) {
         printf("The wasm function calculate is not found.\n");
         goto fail;

samples/ref-types/src/hello.c

@@ -234,19 +234,19 @@ main(int argc, char *argv[])
 
     /* lookup function instance */
     if (!(wasm_cmp_externref_ptr = wasm_runtime_lookup_function(
-              wasm_module_inst, "cmp-externref", NULL))) {
+              wasm_module_inst, "cmp-externref"))) {
         printf("%s\n", "lookup function cmp-externref failed");
         goto fail;
     }
 
     if (!(wasm_get_externref_ptr = wasm_runtime_lookup_function(
-              wasm_module_inst, "get-externref", NULL))) {
+              wasm_module_inst, "get-externref"))) {
         printf("%s\n", "lookup function get-externref failed");
         goto fail;
     }
 
     if (!(wasm_set_externref_ptr = wasm_runtime_lookup_function(
-              wasm_module_inst, "set-externref", NULL))) {
+              wasm_module_inst, "set-externref"))) {
         printf("%s\n", "lookup function set-externref failed");
         goto fail;
     }

samples/shared-module/src/main.c

@@ -104,15 +104,15 @@ main(int argc, char *argv_main[])
             goto fail;
         }
 
-        func_test_data_drop[i] = wasm_runtime_lookup_function(
-            module_inst[i], name_test_data_drop, NULL);
+        func_test_data_drop[i] =
+            wasm_runtime_lookup_function(module_inst[i], name_test_data_drop);
         if (!func_test_data_drop[i]) {
             printf("The wasm function %s is not found.\n", name_test_data_drop);
             goto fail;
         }
 
-        func_test_elem_drop[i] = wasm_runtime_lookup_function(
-            module_inst[i], name_test_elem_drop, NULL);
+        func_test_elem_drop[i] =
+            wasm_runtime_lookup_function(module_inst[i], name_test_elem_drop);
         if (!func_test_elem_drop[i]) {
             printf("The wasm function %s is not found.\n", name_test_elem_drop);
             goto fail;

samples/spawn-thread/src/main.c

@@ -29,7 +29,7 @@ thread(void *arg)
         return NULL;
     }
 
-    func = wasm_runtime_lookup_function(module_inst, "sum", NULL);
+    func = wasm_runtime_lookup_function(module_inst, "sum");
     if (!func) {
         printf("failed to lookup function sum");
         wasm_runtime_destroy_thread_env();
@@ -57,7 +57,7 @@ wamr_thread_cb(wasm_exec_env_t exec_env, void *arg)
     wasm_function_inst_t func;
     uint32 argv[2];
 
-    func = wasm_runtime_lookup_function(module_inst, "sum", NULL);
+    func = wasm_runtime_lookup_function(module_inst, "sum");
     if (!func) {
         printf("failed to lookup function sum");
         return NULL;
@@ -133,7 +133,7 @@ main(int argc, char *argv[])
         goto fail4;
     }
 
-    func = wasm_runtime_lookup_function(wasm_module_inst, "sum", NULL);
+    func = wasm_runtime_lookup_function(wasm_module_inst, "sum");
     if (!func) {
         printf("failed to lookup function sum");
         goto fail5;

samples/terminate/src/main.c

@@ -39,7 +39,7 @@ runner_with_spawn_exec_env(void *vp)
     wasm_function_inst_t func;
     bool ok = wasm_runtime_init_thread_env();
     assert(ok);
-    func = wasm_runtime_lookup_function(inst, "block_forever", NULL);
+    func = wasm_runtime_lookup_function(inst, "block_forever");
     assert(func != NULL);
     wasm_runtime_call_wasm(env, func, 0, NULL);
     wasm_runtime_destroy_spawned_exec_env(env);