Add basic Global API

lib/runtime-c-api/tests/test-globals.c

@@ -0,0 +1,30 @@
+#include <stdio.h>
+#include "../wasmer.h"
+#include <assert.h>
+#include <stdint.h>
+
+int main()
+{
+    wasmer_value_t val;
+    val.tag = WASM_I32;
+    val.value.I32 = 7;
+    wasmer_global_t *global = wasmer_global_new(val, true);
+
+    wasmer_value_t get_val = wasmer_global_get(global);
+    assert( get_val.value.I32 == 7);
+
+    wasmer_value_t val2;
+    val2.tag = WASM_I32;
+    val2.value.I32 = 14;
+    wasmer_global_set(global, val2);
+
+    wasmer_value_t new_get_val = wasmer_global_get(global);
+    assert( new_get_val.value.I32 == 14);
+
+    wasmer_global_descriptor_t desc = wasmer_global_get_descriptor(global);
+    assert(desc.mutable_);
+    assert(desc.kind == WASM_I32);
+
+    wasmer_global_destroy(global);
+    return 0;
+}