process: implement process.hrtime.bigint()

PR-URL: https://github.com/nodejs/node/pull/21256
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>
Reviewed-By: Anatoli Papirovski <apapirovski@mac.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/src/node_process.cc b/src/node_process.cc
index 3a7c12ec45..3655a05648 100644
--- a/src/node_process.cc
+++ b/src/node_process.cc
@@ -31,6 +31,7 @@ namespace node {
 
 using v8::Array;
 using v8::ArrayBuffer;
+using v8::BigUint64Array;
 using v8::Float64Array;
 using v8::FunctionCallbackInfo;
 using v8::HeapStatistics;
@@ -113,7 +114,11 @@ void Cwd(const FunctionCallbackInfo<Value>& args) {
   args.GetReturnValue().Set(cwd);
 }
 
+
 // Hrtime exposes libuv's uv_hrtime() high-resolution timer.
+
+// This is the legacy version of hrtime before BigInt was introduced in
+// JavaScript.
 // The value returned by uv_hrtime() is a 64-bit int representing nanoseconds,
 // so this function instead fills in an Uint32Array with 3 entries,
 // to avoid any integer overflow possibility.
@@ -132,6 +137,12 @@ void Hrtime(const FunctionCallbackInfo<Value>& args) {
   fields[2] = t % NANOS_PER_SEC;
 }
 
+void HrtimeBigInt(const FunctionCallbackInfo<Value>& args) {
+  Local<ArrayBuffer> ab = args[0].As<BigUint64Array>()->Buffer();
+  uint64_t* fields = static_cast<uint64_t*>(ab->GetContents().Data());
+  fields[0] = uv_hrtime();
+}
+
 void Kill(const FunctionCallbackInfo<Value>& args) {
   Environment* env = Environment::GetCurrent(args);