add linux-posix + linux-baremetal recipes

targets/wasm-host/linux-baremetal.c

@@ -0,0 +1,74 @@
+#include "bh_platform.h"
+#include "wasm_export.h"
+
+#include "__WASM_ARRAY_FILE__"
+
+#define STACK_SIZE (4 * 1024)
+#define HEAP_SIZE STACK_SIZE
+#define RUNTIME_POOL_SIZE (4 * STACK_SIZE)
+
+int main(int argc, char *argv[]) {
+  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;
+
+  /* initialize the wasm runtime */
+  static char global_heap_buf[RUNTIME_POOL_SIZE];
+  static RuntimeInitArgs init_args;
+  memset(&init_args, 0, sizeof(RuntimeInitArgs));
+
+  init_args.mem_alloc_type = Alloc_With_Pool;
+  init_args.mem_alloc_option.pool.heap_buf = global_heap_buf;
+  init_args.mem_alloc_option.pool.heap_size = sizeof(global_heap_buf);
+  init_args.max_thread_num = 1;
+  if (!wasm_runtime_full_init(&init_args)) {
+    return 1;
+  }
+
+  /* parse the WASM file from buffer and create a WASM module */
+  module = wasm_runtime_load(__WASM_ARRAY__, __WASM_ARRAY_LEN__, error_buf,
+                             sizeof(error_buf));
+
+  if (!module) {
+    return 1;
+  }
+
+  /* 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));
+
+  if (!module_inst) {
+    return 1;
+  }
+
+  /* lookup a WASM function by its name, the function signature can NULL here */
+  func = wasm_runtime_lookup_function(module_inst, "wasm_module");
+
+  /* create an execution environment to execute arbitrary WASM functions */
+  exec_env = wasm_runtime_create_exec_env(module_inst, STACK_SIZE);
+
+  /* arguments are always transferred in 32-bit element */
+  uint32_t args[1] = {0};
+
+  /* call an arbitrary WASM function */
+  if (!wasm_runtime_call_wasm(exec_env, func, 0, args)) {
+    /* function wasn't called correctly */
+    return 1;
+  }
+
+  /* the return value is stored in args[0] */
+  uint32_t result = args[0];
+
+  wasm_runtime_destroy_exec_env(exec_env);
+  wasm_runtime_deinstantiate(module_inst);
+  wasm_runtime_unload(module);
+  wasm_runtime_destroy();
+
+  if (result == 100) {
+    return 0;
+  } else {
+    return 1;
+  }
+}