vm: use default HDO when importModuleDynamically is not set

This makes it possile to hit the in-isolate compilation cache when
host-defined options are not necessary.

PR-URL: nodejs#49950
Refs: nodejs#35375
Reviewed-By: Benjamin Gruenbaum <[email protected]>
Reviewed-By: Chengzhong Wu <[email protected]>
Reviewed-By: Stephen Belanger <[email protected]>

benchmark/vm/compile-script-in-isolate-cache.js

@@ -0,0 +1,35 @@
+'use strict';
+
+// This benchmarks compiling scripts that hit the in-isolate compilation
+// cache (by having the same source).
+const common = require('../common.js');
+const fs = require('fs');
+const vm = require('vm');
+const fixtures = require('../../test/common/fixtures.js');
+const scriptPath = fixtures.path('snapshot', 'typescript.js');
+
+const bench = common.createBenchmark(main, {
+  type: ['with-dynamic-import-callback', 'without-dynamic-import-callback'],
+  n: [100],
+});
+
+const scriptSource = fs.readFileSync(scriptPath, 'utf8');
+
+function main({ n, type }) {
+  let script;
+  bench.start();
+  const options = {};
+  switch (type) {
+    case 'with-dynamic-import-callback':
+      // Use a dummy callback for now until we really need to benchmark it.
+      options.importModuleDynamically = async () => {};
+      break;
+    case 'without-dynamic-import-callback':
+      break;
+  }
+  for (let i = 0; i < n; i++) {
+    script = new vm.Script(scriptSource, options);
+  }
+  bench.end(n);
+  script.runInThisContext();
+}

lib/internal/modules/esm/utils.js

@@ -12,6 +12,10 @@ const {
     host_defined_option_symbol,
   },
 } = internalBinding('util');
+const {
+  default_host_defined_options,
+} = internalBinding('symbols');
+
 const {
   ERR_VM_DYNAMIC_IMPORT_CALLBACK_MISSING,
   ERR_INVALID_ARG_VALUE,
@@ -128,6 +132,13 @@ const moduleRegistries = new SafeWeakMap();
  */
 function registerModule(referrer, registry) {
   const idSymbol = referrer[host_defined_option_symbol];
+  if (idSymbol === default_host_defined_options) {
+    // The referrer is compiled without custom callbacks, so there is
+    // no registry to hold on to. We'll throw
+    // ERR_VM_DYNAMIC_IMPORT_CALLBACK_MISSING when a callback is
+    // needed.
+    return;
+  }
   // To prevent it from being GC'ed.
   registry.callbackReferrer ??= referrer;
   moduleRegistries.set(idSymbol, registry);

lib/vm.js

@@ -87,6 +87,12 @@ class Script extends ContextifyScript {
     }
     validateBoolean(produceCachedData, 'options.produceCachedData');
 
+    if (importModuleDynamically !== undefined) {
+      // Check that it's either undefined or a function before we pass
+      // it into the native constructor.
+      validateFunction(importModuleDynamically,
+                       'options.importModuleDynamically');
+    }
     // Calling `ReThrow()` on a native TryCatch does not generate a new
     // abort-on-uncaught-exception check. A dummy try/catch in JS land
     // protects against that.
@@ -97,14 +103,13 @@ class Script extends ContextifyScript {
             columnOffset,
             cachedData,
             produceCachedData,
-            parsingContext);
+            parsingContext,
+            importModuleDynamically !== undefined);
     } catch (e) {
       throw e; /* node-do-not-add-exception-line */
     }
 
     if (importModuleDynamically !== undefined) {
-      validateFunction(importModuleDynamically,
-                       'options.importModuleDynamically');
       const { importModuleDynamicallyWrap } = require('internal/vm/module');
       const { registerModule } = require('internal/modules/esm/utils');
       registerModule(this, {

src/env_properties.h

@@ -31,6 +31,7 @@
 // Symbols are per-isolate primitives but Environment proxies them
 // for the sake of convenience.
 #define PER_ISOLATE_SYMBOL_PROPERTIES(V)                                       \
+  V(default_host_defined_options, "default_host_defined_options")              \
   V(fs_use_promises_symbol, "fs_use_promises_symbol")                          \
   V(async_id_symbol, "async_id_symbol")                                        \
   V(handle_onclose_symbol, "handle_onclose")                                   \

src/node_contextify.cc

@@ -787,10 +787,12 @@ void ContextifyScript::New(const FunctionCallbackInfo<Value>& args) {
   bool produce_cached_data = false;
   Local<Context> parsing_context = context;
 
+  bool needs_custom_host_defined_options = false;
   if (argc > 2) {
     // new ContextifyScript(code, filename, lineOffset, columnOffset,
-    //                      cachedData, produceCachedData, parsingContext)
-    CHECK_EQ(argc, 7);
+    //                      cachedData, produceCachedData, parsingContext,
+    //                      needsCustomHostDefinedOptions)
+    CHECK_EQ(argc, 8);
     CHECK(args[2]->IsNumber());
     line_offset = args[2].As<Int32>()->Value();
     CHECK(args[3]->IsNumber());
@@ -809,6 +811,9 @@ void ContextifyScript::New(const FunctionCallbackInfo<Value>& args) {
       CHECK_NOT_NULL(sandbox);
       parsing_context = sandbox->context();
     }
+    if (args[7]->IsTrue()) {
+      needs_custom_host_defined_options = true;
+    }
   }
 
   ContextifyScript* contextify_script =
@@ -832,7 +837,12 @@ void ContextifyScript::New(const FunctionCallbackInfo<Value>& args) {
 
   Local<PrimitiveArray> host_defined_options =
       PrimitiveArray::New(isolate, loader::HostDefinedOptions::kLength);
-  Local<Symbol> id_symbol = Symbol::New(isolate, filename);
+  // We need a default host defined options that's the same for all scripts
+  // not needing custom module callbacks for so that the isolate compilation
+  // cache can be hit.
+  Local<Symbol> id_symbol = needs_custom_host_defined_options
+                                ? Symbol::New(isolate, filename)
+                                : env->default_host_defined_options();
   host_defined_options->Set(
       isolate, loader::HostDefinedOptions::kID, id_symbol);
 

test/parallel/test-vm-no-dynamic-import-callback.js

@@ -0,0 +1,13 @@
+'use strict';
+
+require('../common');
+const { Script } = require('vm');
+const assert = require('assert');
+
+assert.rejects(async () => {
+  const script = new Script('import("fs")');
+  const imported = script.runInThisContext();
+  await imported;
+}, {
+  code: 'ERR_VM_DYNAMIC_IMPORT_CALLBACK_MISSING'
+});