Implement more wasm-c-apis and enable Envoy integration (#622)

Implement more wasm-c-api APIs to support Envoy integration:
- sync up with latest c-api definition
- change CMakeLists to export necessary headers and install the static library of iwasm
- enable to export tables and memories
- support memorytype and tabletype APIs
- update wasm-c-api sampels
- enable to export importtype APIs

And refine bazel scripts for sample XNNPACK workload, add license headers for sample simple.

Signed-off-by: Wenyong Huang <wenyong.huang@intel.com>

samples/wasm-c-api/src/trap.c

@@ -0,0 +1,124 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <inttypes.h>
+
+#include "wasm_c_api.h"
+
+#define own
+
+// A function to be called from Wasm code.
+own wasm_trap_t* fail_callback(
+  void* env, const wasm_val_t args[], wasm_val_t results[]
+) {
+  printf("Calling back...\n");
+  own wasm_name_t message;
+  wasm_name_new_from_string_nt(&message, "callback abort");
+  own wasm_trap_t* trap = wasm_trap_new((wasm_store_t*)env, &message);
+  wasm_name_delete(&message);
+  return trap;
+}
+
+int main(int argc, const char* argv[]) {
+  // Initialize.
+  printf("Initializing...\n");
+  wasm_engine_t* engine = wasm_engine_new();
+  wasm_store_t* store = wasm_store_new(engine);
+
+  // Load binary.
+  printf("Loading binary...\n");
+  FILE* file = fopen("trap.wasm", "rb");
+  if (!file) {
+    printf("> Error loading module!\n");
+    return 1;
+  }
+  fseek(file, 0L, SEEK_END);
+  size_t file_size = ftell(file);
+  fseek(file, 0L, SEEK_SET);
+  wasm_byte_vec_t binary;
+  wasm_byte_vec_new_uninitialized(&binary, file_size);
+  if (fread(binary.data, file_size, 1, file) != 1) {
+    printf("> Error loading module!\n");
+    return 1;
+  }
+  fclose(file);
+
+  // Compile.
+  printf("Compiling module...\n");
+  own wasm_module_t* module = wasm_module_new(store, &binary);
+  if (!module) {
+    printf("> Error compiling module!\n");
+    return 1;
+  }
+
+  wasm_byte_vec_delete(&binary);
+
+  // Create external print functions.
+  printf("Creating callback...\n");
+  own wasm_functype_t* fail_type =
+    wasm_functype_new_0_1(wasm_valtype_new_i32());
+  own wasm_func_t* fail_func =
+    wasm_func_new_with_env(store, fail_type, fail_callback, store, NULL);
+
+  wasm_functype_delete(fail_type);
+
+  // Instantiate.
+  printf("Instantiating module...\n");
+  const wasm_extern_t* imports[] = { wasm_func_as_extern(fail_func) };
+  own wasm_instance_t* instance =
+    wasm_instance_new(store, module, imports, NULL);
+  if (!instance) {
+    printf("> Error instantiating module!\n");
+    return 1;
+  }
+
+  wasm_func_delete(fail_func);
+
+  // Extract export.
+  printf("Extracting exports...\n");
+  own wasm_extern_vec_t exports;
+  wasm_instance_exports(instance, &exports);
+  if (exports.size < 2) {
+    printf("> Error accessing exports!\n");
+    return 1;
+  }
+
+  wasm_module_delete(module);
+  wasm_instance_delete(instance);
+
+  // Call.
+  for (int i = 0; i < 2; ++i) {
+    const wasm_func_t* func = wasm_extern_as_func(exports.data[i]);
+    if (func == NULL) {
+      printf("> Error accessing export!\n");
+      return 1;
+    }
+
+    printf("Calling export %d...\n", i);
+    wasm_val_t results[1]; \
+    own wasm_trap_t* trap = wasm_func_call(func, NULL, results);
+    if (!trap) {
+      printf("> Error calling function, expected trap!\n");
+      return 1;
+    }
+
+    printf("Printing message...\n");
+    own wasm_name_t message;
+    wasm_trap_message(trap, &message);
+    printf("> %s\n", message.data);
+
+    wasm_trap_delete(trap);
+    wasm_name_delete(&message);
+  }
+
+  wasm_extern_vec_delete(&exports);
+
+  // Shut down.
+  printf("Shutting down...\n");
+  wasm_store_delete(store);
+  wasm_engine_delete(engine);
+
+  // All done.
+  printf("Done.\n");
+  return 0;
+}