feat: add a histrical wit-bindgen

__wasm/wit-bindgen-sample/wit-bindgen/crates/gen-spidermonkey/spidermonkey-wasm/dump.cpp

@@ -0,0 +1,48 @@
+#include "smw/dump.h"
+
+#include <assert.h>
+#include "jsapi.h"
+#include "smw/wasm.h"
+
+namespace smw {
+
+static JS::UniqueChars stringify_value(JSContext *cx, JS::HandleValue val) {
+    JS::RootedString str(cx, JS_ValueToSource(cx, val));
+    if (!str) {
+        return nullptr;
+    }
+    return JS_EncodeStringToUTF8(cx, str);
+}
+
+bool dump_value(JSContext *cx, JS::HandleValue val, FILE* fp) {
+    JS::UniqueChars str = stringify_value(cx, val);
+    if (!str) {
+        return false;
+    }
+    fprintf(fp, "%s\n", str.get());
+    return true;
+}
+
+bool dump_stack(JSContext *cx, JS::HandleObject stack, FILE* fp) {
+    JS::RootedString str(cx);
+    size_t indent = 4;
+    if (!JS::BuildStackString(cx, nullptr, stack, &str, indent)) {
+        return false;
+    }
+
+    JS::UniqueChars utf8 = JS_EncodeStringToUTF8(cx, str);
+    if (!utf8) {
+        return false;
+    }
+
+    fprintf(fp, "%s\n", utf8.get());
+    return true;
+}
+
+WASM_EXPORT
+int32_t dump_i32(int32_t x) {
+    fprintf(stderr, "dump_i32: %d\n", x);
+    return x;
+}
+
+} // namespace smw