add simple host program that loads a wasm module using the wamr runtime

wasm-base/examples/embed/host.c

@@ -0,0 +1,94 @@
+// https://github.com/bytecodealliance/wasm-micro-runtime/blob/WAMR-2.4.4/doc/embed_wamr.md
+
+#include <stdio.h>
+#include <string.h>
+
+#include "bh_platform.h"
+#include "bh_read_file.h"
+#include "wasm_export.h"
+
+#define STACK_SIZE (8 * 1024)
+#define HEAP_SIZE (8 * 1024)
+
+// TODO: Set this up so the lsp actually finds the includes...
+
+int main(int argc, char **argv) {
+  if (argc != 2) {
+    printf("Missing .wasm or .aot file argument!\n");
+    return 1;
+  }
+
+  if (!strstr(argv[1], ".wasm") && !strstr(argv[1], ".aot")) {
+    printf("Only .wasm or .aot files are supported!\n");
+    return 1;
+  }
+
+  uint8 *buffer;
+  char error_buf[128];
+  wasm_module_t module;
+  wasm_module_inst_t module_inst;
+  wasm_function_inst_t func;
+  wasm_exec_env_t exec_env;
+  uint32 size;
+  uint32 stack_size = 8 * 1024;
+  uint32 heap_size = 8 * 1024;
+
+  /* initialize the wasm runtime by default configurations */
+  // wasm_runtime_init();
+
+  printf("Initializing WAMR runtime\n");
+  RuntimeInitArgs init_args;
+  memset(&init_args, 0, sizeof(init_args));
+  init_args.mem_alloc_type = Alloc_With_System_Allocator;
+  if (!wasm_runtime_full_init(&init_args)) {
+    printf("Failed to initialize WAMR runtime\n");
+    return 1;
+  }
+
+  /* read WASM file into a memory buffer */
+  printf("Instantiating module from file '%s'\n", argv[1]);
+  buffer = bh_read_file_to_buffer(argv[1], &size);
+
+  /* add line below if we want to export native functions to WASM app */
+  // wasm_runtime_register_natives(...);
+
+  /* parse the WASM file from buffer and create a WASM module */
+  module = wasm_runtime_load(buffer, size, error_buf, sizeof(error_buf));
+
+  /* create an instance of the WASM module (WASM linear memory is ready) */
+  module_inst = wasm_runtime_instantiate(module, stack_size, heap_size,
+                                         error_buf, sizeof(error_buf));
+
+  /* lookup a WASM function by its name
+      The function signature can NULL here */
+  // func = wasm_runtime_lookup_function(module_inst, "wasm_module");
+
+  /* creat an execution environment to execute the WASM functions */
+  // exec_env = wasm_runtime_create_exec_env(module_inst, stack_size);
+
+  // TODO: Also when using execute_main?
+  /* arguments are always transferred in 32-bit element */
+  uint32 args[1];
+  args[0] = 8;
+  args[1] = 16;
+
+  // TODO: The arguments have to be passed differently, probably using
+  // wasm_runtime_set_wasi_args?
+  /* call the WASM function */
+  printf("Calling WASM function\n");
+  wasm_application_execute_main(module_inst, 2, args);
+  // if (wasm_runtime_call_wasm(exec_env, func, 1, args)) {
+  //   /* the return value is stored in argv[0] */
+  //   printf("wasm function return: %d\n", args[0]);
+  // } else {
+  //   /* exception is thrown if call fails */
+  //   printf("%s\n", wasm_runtime_get_exception(module_inst));
+  // }
+
+  // wasm_runtime_destroy_exec_env(exec_env);
+  wasm_runtime_deinstantiate(module_inst);
+  wasm_runtime_unload(module);
+  wasm_runtime_destroy();
+
+  return 0;
+}

wasm-base/examples/test.c

@@ -7,6 +7,7 @@ int main(int argc, char **argv) {
   char *buf;
 
   printf("Hello world!\n");
+  printf("Got %d args!\n", argc);
 
   buf = malloc(1024);
   if (!buf) {