Implement tagged enum for params/results

lib/runtime-c-api/wasmer.h

@@ -13,19 +13,39 @@ typedef enum {
   WASMER_COMPILE_ERROR = 2,
 } wasmer_compile_result_t;
 
+enum wasmer_value_tag {
+  WASM_I32,
+  WASM_I64,
+  WASM_F32,
+  WASM_F64,
+};
+typedef uint32_t wasmer_value_tag;
+
 typedef struct wasmer_import_object_t wasmer_import_object_t;
 
 typedef struct wasmer_instance_t wasmer_instance_t;
 
+typedef union {
+  int32_t I32;
+  int64_t I64;
+  float F32;
+  double F64;
+} wasmer_value;
+
+typedef struct {
+  wasmer_value_tag tag;
+  wasmer_value value;
+} wasmer_value_t;
+
 void wasmer_import_object_destroy(wasmer_import_object_t *import_object);
 
 wasmer_import_object_t *wasmer_import_object_new(void);
 
 wasmer_call_result_t wasmer_instance_call(wasmer_instance_t *instance,
                                           const char *name,
-                                          const uint32_t *params,
+                                          const wasmer_value_t *params,
                                           int params_len,
-                                          uint32_t *results,
+                                          wasmer_value_t *results,
                                           int results_len);
 
 void wasmer_instance_destroy(wasmer_instance_t *instance);