src: enable snapshot with per-isolate data

Enable serializing the isolate from an isolate snapshot generated
by node_mksnapshot with per-isolate data.

PR-URL: https://github.com/nodejs/node/pull/27321
Refs: https://github.com/nodejs/node/issues/17058
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

node.gyp

@@ -223,6 +223,7 @@
       'deps/acorn/acorn/dist/acorn.js',
       'deps/acorn/acorn-walk/dist/walk.js',
     ],
+    'node_mksnapshot_exec': '<(PRODUCT_DIR)/<(EXECUTABLE_PREFIX)node_mksnapshot<(EXECUTABLE_SUFFIX)',
     'mkcodecache_exec': '<(PRODUCT_DIR)/<(EXECUTABLE_PREFIX)mkcodecache<(EXECUTABLE_SUFFIX)',
     'conditions': [
       [ 'node_shared=="true"', {
@@ -430,6 +431,31 @@
             'src/node_code_cache_stub.cc'
           ],
         }],
+        ['want_separate_host_toolset==0', {
+          'dependencies': [
+            'node_mksnapshot',
+          ],
+          'actions': [
+            {
+              'action_name': 'node_mksnapshot',
+              'process_outputs_as_sources': 1,
+              'inputs': [
+                '<(node_mksnapshot_exec)',
+              ],
+              'outputs': [
+                '<(SHARED_INTERMEDIATE_DIR)/node_snapshot.cc',
+              ],
+              'action': [
+                '<@(_inputs)',
+                '<@(_outputs)',
+              ],
+            },
+          ],
+        }, {
+          'sources': [
+            'src/node_snapshot_stub.cc'
+          ],
+        }],
       ],
     }, # node_core_target_name
     {
@@ -1038,6 +1064,7 @@
       'defines': [ 'NODE_WANT_INTERNALS=1' ],
 
       'sources': [
+        'src/node_snapshot_stub.cc',
         'src/node_code_cache_stub.cc',
         'test/cctest/gtest/gtest-all.cc',
         'test/cctest/gtest/gtest_main.cc',
@@ -1131,6 +1158,7 @@
         'NODE_WANT_INTERNALS=1'
       ],
       'sources': [
+        'src/node_snapshot_stub.cc',
         'src/node_code_cache_stub.cc',
         'tools/code_cache/mkcodecache.cc',
         'tools/code_cache/cache_builder.cc',
@@ -1180,6 +1208,7 @@
       'defines': [ 'NODE_WANT_INTERNALS=1' ],
 
       'sources': [
+        'src/node_snapshot_stub.cc',
         'src/node_code_cache_stub.cc',
         'tools/snapshot/node_mksnapshot.cc',
         'tools/snapshot/snapshot_builder.cc',

src/node.cc

@@ -887,11 +887,24 @@ int Start(int argc, char** argv) {
 
   {
     Isolate::CreateParams params;
+    // TODO(joyeecheung): collect external references and set it in
+    // params.external_references.
+    std::vector<intptr_t> external_references = {
+        reinterpret_cast<intptr_t>(nullptr)};
+    v8::StartupData* blob = NodeMainInstance::GetEmbeddedSnapshotBlob();
+    const NodeMainInstance::IndexArray* indexes =
+        NodeMainInstance::GetIsolateDataIndexes();
+    if (blob != nullptr) {
+      params.external_references = external_references.data();
+      params.snapshot_blob = blob;
+    }
+
     NodeMainInstance main_instance(&params,
                                    uv_default_loop(),
                                    per_process::v8_platform.Platform(),
                                    result.args,
-                                   result.exec_args);
+                                   result.exec_args,
+                                   indexes);
     result.exit_code = main_instance.Run();
   }
 

src/node_main_instance.cc

@@ -175,6 +175,7 @@ std::unique_ptr<Environment> NodeMainInstance::CreateMainEnvironment(
   if (deserialize_mode_) {
     SetIsolateUpForNode(isolate_, IsolateSettingCategories::kErrorHandlers);
   }
+
   CHECK(!context.IsEmpty());
   Context::Scope context_scope(context);
 

src/node_main_instance.h

@@ -70,6 +70,11 @@ class NodeMainInstance {
   // and the environment creation routine in workers somehow.
   std::unique_ptr<Environment> CreateMainEnvironment(int* exit_code);
 
+  // If nullptr is returned, the binary is not built with embedded
+  // snapshot.
+  static const IndexArray* GetIsolateDataIndexes();
+  static v8::StartupData* GetEmbeddedSnapshotBlob();
+
  private:
   NodeMainInstance(const NodeMainInstance&) = delete;
   NodeMainInstance& operator=(const NodeMainInstance&) = delete;

src/node_snapshot_stub.cc

@@ -0,0 +1,13 @@
+#include "node_main_instance.h"
+
+namespace node {
+
+v8::StartupData* NodeMainInstance::GetEmbeddedSnapshotBlob() {
+  return nullptr;
+}
+
+const NodeMainInstance::IndexArray* NodeMainInstance::GetIsolateDataIndexes() {
+  return nullptr;
+}
+
+}  // namespace node