[runtime] Add async-stack-trace support for Promise.allSettled

... with zero cost.

Bug: v8:9357
Change-Id: I66985c3fd3e7b4efa354eb564c641562cf55ab49
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3518909
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79632}

src/builtins/builtins-callsite.cc

@@ -104,7 +104,8 @@ BUILTIN(CallSitePrototypeGetPosition) {
 BUILTIN(CallSitePrototypeGetPromiseIndex) {
   HandleScope scope(isolate);
   CHECK_CALLSITE(frame, "getPromiseIndex");
-  if (!frame->IsPromiseAll() && !frame->IsPromiseAny()) {
+  if (!frame->IsPromiseAll() && !frame->IsPromiseAny() &&
+      !frame->IsPromiseAllSettled()) {
     return ReadOnlyRoots(isolate).null_value();
   }
   return Smi::FromInt(CallSiteInfo::GetSourcePosition(frame));

src/execution/isolate.cc

@@ -989,6 +989,25 @@ void CaptureAsyncStackTrace(Isolate* isolate, Handle<JSPromise> promise,
           PromiseCapability::cast(context->get(index)), isolate);
       if (!capability->promise().IsJSPromise()) return;
       promise = handle(JSPromise::cast(capability->promise()), isolate);
+    } else if (IsBuiltinFunction(
+                   isolate, reaction->fulfill_handler(),
+                   Builtin::kPromiseAllSettledResolveElementClosure)) {
+      Handle<JSFunction> function(JSFunction::cast(reaction->fulfill_handler()),
+                                  isolate);
+      Handle<Context> context(function->context(), isolate);
+      Handle<JSFunction> combinator(
+          context->native_context().promise_all_settled(), isolate);
+      builder->AppendPromiseCombinatorFrame(function, combinator);
+
+      // Now peak into the Promise.allSettled() resolve element context to
+      // find the promise capability that's being resolved when all
+      // the concurrent promises resolve.
+      int const index =
+          PromiseBuiltins::kPromiseAllResolveElementCapabilitySlot;
+      Handle<PromiseCapability> capability(
+          PromiseCapability::cast(context->get(index)), isolate);
+      if (!capability->promise().IsJSPromise()) return;
+      promise = handle(JSPromise::cast(capability->promise()), isolate);
     } else if (IsBuiltinFunction(isolate, reaction->reject_handler(),
                                  Builtin::kPromiseAnyRejectElementClosure)) {
       Handle<JSFunction> function(JSFunction::cast(reaction->reject_handler()),

src/init/bootstrapper.cc

@@ -2387,8 +2387,10 @@ void Genesis::InitializeGlobal(Handle<JSGlobalObject> global_object,
         isolate_, promise_fun, "all", Builtin::kPromiseAll, 1, true);
     native_context()->set_promise_all(*promise_all);
 
-    InstallFunctionWithBuiltinId(isolate_, promise_fun, "allSettled",
+    Handle<JSFunction> promise_all_settled =
-                                 Builtin::kPromiseAllSettled, 1, true);
+        InstallFunctionWithBuiltinId(isolate_, promise_fun, "allSettled",
+                                     Builtin::kPromiseAllSettled, 1, true);
+    native_context()->set_promise_all_settled(*promise_all_settled);
 
     Handle<JSFunction> promise_any = InstallFunctionWithBuiltinId(
         isolate_, promise_fun, "any", Builtin::kPromiseAny, 1, true);

src/objects/call-site-info.cc

@@ -22,6 +22,12 @@ bool CallSiteInfo::IsPromiseAll() const {
   return fun == fun.native_context().promise_all();
 }
 
+bool CallSiteInfo::IsPromiseAllSettled() const {
+  if (!IsAsync()) return false;
+  JSFunction fun = JSFunction::cast(function());
+  return fun == fun.native_context().promise_all_settled();
+}
+
 bool CallSiteInfo::IsPromiseAny() const {
   if (!IsAsync()) return false;
   JSFunction fun = JSFunction::cast(function());
@@ -507,6 +513,7 @@ int CallSiteInfo::GetSourcePosition(Handle<CallSiteInfo> info) {
     return info->code_offset_or_source_position();
   }
   DCHECK(!info->IsPromiseAll());
+  DCHECK(!info->IsPromiseAllSettled());
   DCHECK(!info->IsPromiseAny());
   int source_position =
       ComputeSourcePosition(info, info->code_offset_or_source_position());
@@ -711,7 +718,8 @@ void SerializeJSStackFrame(Isolate* isolate, Handle<CallSiteInfo> frame,
   Handle<Object> function_name = CallSiteInfo::GetFunctionName(frame);
   if (frame->IsAsync()) {
     builder->AppendCStringLiteral("async ");
-    if (frame->IsPromiseAll() || frame->IsPromiseAny()) {
+    if (frame->IsPromiseAll() || frame->IsPromiseAny() ||
+        frame->IsPromiseAllSettled()) {
       builder->AppendCStringLiteral("Promise.");
       builder->AppendString(Handle<String>::cast(function_name));
       builder->AppendCStringLiteral(" (index ");

src/objects/call-site-info.h

@@ -40,6 +40,7 @@ class CallSiteInfo : public TorqueGeneratedCallSiteInfo<CallSiteInfo, Struct> {
   bool IsMethodCall() const;
   bool IsToplevel() const;
   bool IsPromiseAll() const;
+  bool IsPromiseAllSettled() const;
   bool IsPromiseAny() const;
   bool IsNative() const;
 

src/objects/contexts.h

@@ -345,6 +345,7 @@ enum ContextLookupFlags {
   V(OBJECT_TO_STRING, JSFunction, object_to_string)                            \
   V(OBJECT_VALUE_OF_FUNCTION_INDEX, JSFunction, object_value_of_function)      \
   V(PROMISE_ALL_INDEX, JSFunction, promise_all)                                \
+  V(PROMISE_ALL_SETTLED_INDEX, JSFunction, promise_all_settled)                \
   V(PROMISE_ANY_INDEX, JSFunction, promise_any)                                \
   V(PROMISE_FUNCTION_INDEX, JSFunction, promise_function)                      \
   V(RANGE_ERROR_FUNCTION_INDEX, JSFunction, range_error_function)              \

test/mjsunit/async-stack-traces-promise-all-settled.js

@@ -0,0 +1,45 @@
+// Copyright 2022 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --allow-natives-syntax --async-stack-traces
+
+// Basic test with Promise.allSettled().
+(function() {
+  async function fine() { }
+
+  async function thrower() {
+    await fine();
+    throw new Error();
+  }
+
+  async function driver() {
+    return await Promise.allSettled([fine(), fine(), thrower(), thrower()]);
+  }
+
+  async function test(f) {
+    const results = await f();
+    results.forEach((result, i) => {
+      if (result.status === 'rejected') {
+        const error = result.reason;
+        assertInstanceof(error, Error);
+        const stackRegexp = new RegExp("Error.+at thrower.+at " +
+          `async Promise.allSettled \\(index ${ i }\\)` +
+          ".+ at async driver.+at async test",
+          "ms")
+        assertMatches(stackRegexp, error.stack);
+      }
+    });
+  }
+
+  assertPromiseResult((async () => {
+    %PrepareFunctionForOptimization(thrower);
+    %PrepareFunctionForOptimization(driver);
+    await test(driver);
+    await test(driver);
+    %OptimizeFunctionOnNextCall(thrower);
+    await test(driver);
+    %OptimizeFunctionOnNextCall(driver);
+    await test(driver);
+  })());
+})();