3 files changed, 57 insertions, 2 deletions
diff --git a/ext/node/lib.rs b/ext/node/lib.rs
index f4c23a16a..cb273ef9e 100644
--- a/ext/node/lib.rs
+++ b/ext/node/lib.rs
@@ -20,6 +20,7 @@ mod package_json;
 mod path;
 mod polyfill;
 mod resolution;
+mod v8;
 mod winerror;
 
 pub use package_json::PackageJson;
@@ -413,6 +414,8 @@ pub fn init_polyfill() -> Extension {
       crypto::op_node_hash_digest::decl(),
       crypto::op_node_hash_clone::decl(),
       winerror::op_node_sys_to_uv_error::decl(),
+      v8::op_v8_cached_data_version_tag::decl(),
+      v8::op_v8_get_heap_statistics::decl(),
       op_node_build_os::decl(),
     ])
     .build()
diff --git a/ext/node/polyfills/v8.ts b/ext/node/polyfills/v8.ts
index f186ff023..c7875e654 100644
--- a/ext/node/polyfills/v8.ts
+++ b/ext/node/polyfills/v8.ts
@@ -3,8 +3,10 @@
 
 import { notImplemented } from "internal:deno_node/polyfills/_utils.ts";
 
+const { ops } = globalThis.__bootstrap.core;
+
 export function cachedDataVersionTag() {
-  notImplemented("v8.cachedDataVersionTag");
+  return ops.op_v8_cached_data_version_tag();
 }
 export function getHeapCodeStatistics() {
   notImplemented("v8.getHeapCodeStatistics");
@@ -15,9 +17,30 @@ export function getHeapSnapshot() {
 export function getHeapSpaceStatistics() {
   notImplemented("v8.getHeapSpaceStatistics");
 }
+
+const buffer = new Float64Array(14);
+
 export function getHeapStatistics() {
-  notImplemented("v8.getHeapStatistics");
+  ops.op_v8_get_heap_statistics(buffer);
+
+  return {
+    total_heap_size: buffer[0],
+    total_heap_size_executable: buffer[1],
+    total_physical_size: buffer[2],
+    total_available_size: buffer[3],
+    used_heap_size: buffer[4],
+    heap_size_limit: buffer[5],
+    malloced_memory: buffer[6],
+    peak_malloced_memory: buffer[7],
+    does_zap_garbage: buffer[8],
+    number_of_native_contexts: buffer[9],
+    number_of_detached_contexts: buffer[10],
+    total_global_handles_size: buffer[11],
+    used_global_handles_size: buffer[12],
+    external_memory: buffer[13],
+  };
 }
+
 export function setFlagsFromString() {
   notImplemented("v8.setFlagsFromString");
 }
diff --git a/ext/node/v8.rs b/ext/node/v8.rs
new file mode 100644
index 000000000..5307f7107
--- /dev/null
+++ b/ext/node/v8.rs
@@ -0,0 +1,29 @@
+// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
+use deno_core::op;
+use deno_core::v8;
+
+#[op]
+fn op_v8_cached_data_version_tag() -> u32 {
+  v8::script_compiler::cached_data_version_tag()
+}
+
+#[op(v8)]
+fn op_v8_get_heap_statistics(scope: &mut v8::HandleScope, buffer: &mut [f64]) {
+  let mut stats = v8::HeapStatistics::default();
+  scope.get_heap_statistics(&mut stats);
+
+  buffer[0] = stats.total_heap_size() as f64;
+  buffer[1] = stats.total_heap_size_executable() as f64;
+  buffer[2] = stats.total_physical_size() as f64;
+  buffer[3] = stats.total_available_size() as f64;
+  buffer[4] = stats.used_heap_size() as f64;
+  buffer[5] = stats.heap_size_limit() as f64;
+  buffer[6] = stats.malloced_memory() as f64;
+  buffer[7] = stats.peak_malloced_memory() as f64;
+  buffer[8] = stats.does_zap_garbage() as f64;
+  buffer[9] = stats.number_of_native_contexts() as f64;
+  buffer[10] = stats.number_of_detached_contexts() as f64;
+  buffer[11] = stats.total_global_handles_size() as f64;
+  buffer[12] = stats.used_global_handles_size() as f64;
+  buffer[13] = stats.external_memory() as f64;
+}