[wasm] Embedder can control what buffers wasm compilation works on.

include/v8.h

Index: include/v8.h
diff --git a/include/v8.h b/include/v8.h
index b9d44d7df8b49053c4856ecfe913b1b9021eaa7b..f269b4cfc1f8f875ece68b531163bde010a4e7d3 100644
--- a/include/v8.h
+++ b/include/v8.h
@@ -5947,6 +5947,18 @@ typedef void (*FailedAccessCheckCallback)(Local<Object> target,
  */
 typedef bool (*AllowCodeGenerationFromStringsCallback)(Local<Context> context);
 
+// --- WASM compilation callbacks ---
+
+/**
+ * Callback to check if a buffer source may be compiled to WASM, given
+ * the compilation is attempted as a promise or not.
+ */
+
+typedef bool (*AllowWasmCompileCallback)(Local<Value> source, bool as_promise);
+
+typedef bool (*AllowWasmInstantiateCallback)(Local<WasmCompiledModule> module,
+                                             Local<Value> ffi, bool as_promise);
+
 // --- Garbage Collection Callbacks ---
 
 /**
@@ -7201,6 +7213,16 @@ class V8_EXPORT Isolate {
       AllowCodeGenerationFromStringsCallback callback);
 
   /**
+   * Set the callback to invoke to check if wasm compilation from
+   * the specified object is allowed. By default, wasm compilation
+   * is allowed.
+   *
+   * Similar for instantiate.
+   */
+  void SetAllowWasmCompileCallback(AllowWasmCompileCallback callback);
+  void SetAllowWasmInstantiateCallback(AllowWasmInstantiateCallback callback);
+
+  /**
   * Check if V8 is dead and therefore unusable.  This is the case after
   * fatal errors such as out-of-memory situations.
   */