1 files changed, 138 insertions, 0 deletions
diff --git a/fluent-bit/lib/wasm-micro-runtime-WAMR-1.2.2/samples/wasm-c-api/src/hello.c b/fluent-bit/lib/wasm-micro-runtime-WAMR-1.2.2/samples/wasm-c-api/src/hello.c
new file mode 100644
index 000000000..3ebea87b0
--- /dev/null
+++ b/fluent-bit/lib/wasm-micro-runtime-WAMR-1.2.2/samples/wasm-c-api/src/hello.c
@@ -0,0 +1,138 @@
+#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* hello_callback(
+  const wasm_val_vec_t* args, wasm_val_vec_t* results
+) {
+  printf("Calling back...\n");
+  printf("> Hello World!\n");
+  return NULL;
+}
+
+
+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");
+#if WASM_ENABLE_AOT != 0 && WASM_ENABLE_INTERP == 0
+  FILE* file = fopen("hello.aot", "rb");
+#else
+  FILE* file = fopen("hello.wasm", "rb");
+#endif
+  if (!file) {
+    printf("> Error loading module!\n");
+    return 1;
+  }
+
+  int ret = fseek(file, 0L, SEEK_END);
+  if (ret == -1) {
+    printf("> Error loading module!\n");
+    fclose(file);
+    return 1;
+  }
+
+  long file_size = ftell(file);
+  if (file_size == -1) {
+    printf("> Error loading module!\n");
+    fclose(file);
+    return 1;
+  }
+
+  ret = fseek(file, 0L, SEEK_SET);
+  if (ret == -1) {
+    printf("> Error loading module!\n");
+    fclose(file);
+    return 1;
+  }
+
+  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");
+    fclose(file);
+    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* hello_type = wasm_functype_new_0_0();
+  own wasm_func_t* hello_func =
+    wasm_func_new(store, hello_type, hello_callback);
+
+  wasm_functype_delete(hello_type);
+
+  // Instantiate.
+  printf("Instantiating module...\n");
+  wasm_extern_t* externs[] = { wasm_func_as_extern(hello_func) };
+  wasm_extern_vec_t imports = WASM_ARRAY_VEC(externs);
+  own wasm_instance_t* instance =
+    wasm_instance_new(store, module, &imports, NULL);
+  if (!instance) {
+    printf("> Error instantiating module!\n");
+    return 1;
+  }
+
+  wasm_func_delete(hello_func);
+
+  // Extract export.
+  printf("Extracting export...\n");
+  own wasm_extern_vec_t exports;
+  wasm_instance_exports(instance, &exports);
+  if (exports.size == 0) {
+    printf("> Error accessing exports!\n");
+    return 1;
+  }
+
+  const wasm_func_t* run_func = wasm_extern_as_func(exports.data[0]);
+  if (run_func == NULL) {
+    printf("> Error accessing export!\n");
+    return 1;
+  }
+
+  wasm_module_delete(module);
+  wasm_instance_delete(instance);
+
+  // Call.
+  printf("Calling export...\n");
+  wasm_val_vec_t args = WASM_EMPTY_VEC;
+  wasm_val_vec_t results = WASM_EMPTY_VEC;
+  wasm_trap_t *trap = wasm_func_call(run_func, &args, &results);
+  if (trap) {
+      printf("> Error calling function!\n");
+      wasm_trap_delete(trap);
+      return 1;
+  }
+
+  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;
+}