From 5ada3ec26c70216a4887b0404ba80da7adff2bd1 Mon Sep 17 00:00:00 2001
From: Chinmay Garde <chinmaygarde@google.com>
Date: Wed, 23 Oct 2019 13:18:59 -0700
Subject: [PATCH] Add FlutterEngineRunsAOTCompiledDartCode to the embedder API.

For embedder code that is configured for both AOT and JIT mode Dart execution
based on the Flutter engine being linked to, this runtime check may be used to
appropriately configure the `FlutterProjectArgs`. In JIT mode execution, the
kernel snapshots must be present in the Flutter assets directory specified in
the `FlutterProjectArgs`. For AOT execution, the fields `vm_snapshot_data`,
`vm_snapshot_instructions`, `isolate_snapshot_data` and
`isolate_snapshot_instructions` (along with their size fields) must be specified
in `FlutterProjectArgs`.
---
 shell/platform/embedder/embedder.cc           |  4 ++++
 shell/platform/embedder/embedder.h            | 20 +++++++++++++++++++
 .../embedder/tests/embedder_unittests.cc      |  5 +++++
 3 files changed, 29 insertions(+)

diff --git a/shell/platform/embedder/embedder.cc b/shell/platform/embedder/embedder.cc
index 3f2a972669d14..ecf27cd6586e6 100644
--- a/shell/platform/embedder/embedder.cc
+++ b/shell/platform/embedder/embedder.cc
@@ -1573,3 +1573,7 @@ FlutterEngineResult FlutterEngineUpdateLocales(FLUTTER_API_SYMBOL(FlutterEngine)
                                   "Could not send message to update locale of "
                                   "a running Flutter application.");
 }
+
+bool FlutterEngineRunsAOTCompiledDartCode(void) {
+  return flutter::DartVM::IsRunningPrecompiledCode();
+}
diff --git a/shell/platform/embedder/embedder.h b/shell/platform/embedder/embedder.h
index 0ffcbae6f73ad..aaa2440e5397f 100644
--- a/shell/platform/embedder/embedder.h
+++ b/shell/platform/embedder/embedder.h
@@ -1456,6 +1456,26 @@ FlutterEngineResult FlutterEngineUpdateLocales(FLUTTER_API_SYMBOL(FlutterEngine)
                                                const FlutterLocale** locales,
                                                size_t locales_count);
 
+//------------------------------------------------------------------------------
+/// @brief      Returns if the Flutter engine instance will run AOT compiled
+///             Dart code. This call has no threading restrictions.
+///
+///             For embedder code that is configured for both AOT and JIT mode
+///             Dart execution based on the Flutter engine being linked to, this
+///             runtime check may be used to appropriately configure the
+///             `FlutterProjectArgs`. In JIT mode execution, the kernel
+///             snapshots must be present in the Flutter assets directory
+///             specified in the `FlutterProjectArgs`. For AOT execution, the
+///             fields `vm_snapshot_data`, `vm_snapshot_instructions`,
+///             `isolate_snapshot_data` and `isolate_snapshot_instructions`
+///             (along with their size fields) must be specified in
+///             `FlutterProjectArgs`.
+///
+/// @return     True, if AOT Dart code is run. JIT otherwise.
+///
+FLUTTER_EXPORT
+bool FlutterEngineRunsAOTCompiledDartCode(void);
+
 #if defined(__cplusplus)
 }  // extern "C"
 #endif
diff --git a/shell/platform/embedder/tests/embedder_unittests.cc b/shell/platform/embedder/tests/embedder_unittests.cc
index dc38064b27019..3ebb64479e83c 100644
--- a/shell/platform/embedder/tests/embedder_unittests.cc
+++ b/shell/platform/embedder/tests/embedder_unittests.cc
@@ -2809,5 +2809,10 @@ TEST_F(EmbedderTest, CanUpdateLocales) {
   check_latch.Wait();
 }
 
+TEST_F(EmbedderTest, CanQueryDartAOTMode) {
+  ASSERT_EQ(FlutterEngineRunsAOTCompiledDartCode(),
+            flutter::DartVM::IsRunningPrecompiledCode());
+}
+
 }  // namespace testing
 }  // namespace flutter