[pkg/vm] Instantiate the ffi Pointer class to bounds when needed.

Previously, the FFI transformer could produce is checks where the
type to check against was Pointer<dynamic>. However, given that
the Pointer class is defined as:

abstract class Pointer<X extends NativeType> ...

the instantiated to bounds version of its type is Pointer<NativeType>.
Pointer<dynamic> is not a subtype of Pointer<NativeType>, and thus is an
invalid instantiation, but the only place this type could occur was as
the right hand side of an is check.

Before 7cc005e, Class::RareType() returned the class instantiated with
the null (all-dynamic) type arguments vector. Among other things, this
"rare" type was compared to the right-hand side of is checks and, if it
matched, performed a simple (cid-only) check of the instance type
arguments in unoptimized code.

Afterwards, Class::RareType() returns the class instantiated with a type
arguments vector where each type parameter is instantiated to bounds, so
now the "rare" type check fails and it falls back to the full check of
the instance type arguments, which causes a ~25% regression in some
unoptimized benchmarks.

This CL fixes the generation of those is checks in the FFI transformer
to use the instantiated to bounds version of the Pointer type instead.

TEST=pkg/front_end/test

Issue: #52843
Issue: #52848
Cq-Include-Trybots: luci.dart.try:vm-ffi-qemu-linux-release-riscv64-try,vm-ffi-qemu-linux-release-arm-try,vm-aot-linux-debug-x64-try,vm-linux-debug-x64-try
Change-Id: Ic9ac6d75ba2743e233065444fad13ab098094349
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/312400
Reviewed-by: Daco Harkes <dacoharkes@google.com>
Reviewed-by: Erik Ernst <eernst@google.com>
Auto-Submit: Tess Strickland <sstrickl@google.com>
Commit-Queue: Tess Strickland <sstrickl@google.com>

pkg/front_end/testcases/incremental/crash_05.yaml.world.1.expect

@@ -39,7 +39,7 @@ library from "org-dartlang-test:///main.dart" as main {
       return new lib::Y::#fromTypedDataBase( block {
         synthesized dart.core::Object #typedDataBase = this.{dart.ffi::_Compound::_typedDataBase}{dart.core::Object};
         synthesized dart.core::int #offset = #C9.{dart.core::List::[]}(dart.ffi::_abi()){(dart.core::int) → dart.core::int*};
-      } =>#typedDataBase is{ForLegacy} dart.ffi::Pointer<dynamic> ?{dart.core::Object} dart.ffi::_fromAddress<lib::Y>(#typedDataBase.{dart.ffi::Pointer::address}{dart.core::int}.{dart.core::num::+}(#offset){(dart.core::num) → dart.core::num}) : let synthesized dart.typed_data::TypedData #typedData = dart._internal::unsafeCast<dart.typed_data::TypedData>(#typedDataBase) in #typedData.{dart.typed_data::TypedData::buffer}{dart.typed_data::ByteBuffer}.{dart.typed_data::ByteBuffer::asUint8List}(#typedData.{dart.typed_data::TypedData::offsetInBytes}{dart.core::int}.{dart.core::num::+}(#offset){(dart.core::num) → dart.core::num}, #C13.{dart.core::List::[]}(dart.ffi::_abi()){(dart.core::int) → dart.core::int*}){([dart.core::int, dart.core::int?]) → dart.typed_data::Uint8List});
+      } =>#typedDataBase is{ForLegacy} dart.ffi::Pointer<dart.ffi::NativeType> ?{dart.core::Object} dart.ffi::_fromAddress<lib::Y>(#typedDataBase.{dart.ffi::Pointer::address}{dart.core::int}.{dart.core::num::+}(#offset){(dart.core::num) → dart.core::num}) : let synthesized dart.typed_data::TypedData #typedData = dart._internal::unsafeCast<dart.typed_data::TypedData>(#typedDataBase) in #typedData.{dart.typed_data::TypedData::buffer}{dart.typed_data::ByteBuffer}.{dart.typed_data::ByteBuffer::asUint8List}(#typedData.{dart.typed_data::TypedData::offsetInBytes}{dart.core::int}.{dart.core::num::+}(#offset){(dart.core::num) → dart.core::num}, #C13.{dart.core::List::[]}(dart.ffi::_abi()){(dart.core::int) → dart.core::int*}){([dart.core::int, dart.core::int?]) → dart.typed_data::Uint8List});
     set xx(lib::Y #externalFieldValue) → void
       return dart.ffi::_memCopy(this.{dart.ffi::_Compound::_typedDataBase}{dart.core::Object}, #C9.{dart.core::List::[]}(dart.ffi::_abi()){(dart.core::int) → dart.core::int*}, #externalFieldValue.{dart.ffi::_Compound::_typedDataBase}{dart.core::Object}, #C8, #C13.{dart.core::List::[]}(dart.ffi::_abi()){(dart.core::int) → dart.core::int*});
     @#C11

pkg/front_end/testcases/incremental/crash_05.yaml.world.2.expect

@@ -39,7 +39,7 @@ library from "org-dartlang-test:///main.dart" as main {
       return new lib::Y::#fromTypedDataBase( block {
         synthesized dart.core::Object #typedDataBase = this.{dart.ffi::_Compound::_typedDataBase}{dart.core::Object};
         synthesized dart.core::int #offset = #C9.{dart.core::List::[]}(dart.ffi::_abi()){(dart.core::int) → dart.core::int*};
-      } =>#typedDataBase is{ForLegacy} dart.ffi::Pointer<dynamic> ?{dart.core::Object} dart.ffi::_fromAddress<lib::Y>(#typedDataBase.{dart.ffi::Pointer::address}{dart.core::int}.{dart.core::num::+}(#offset){(dart.core::num) → dart.core::num}) : let synthesized dart.typed_data::TypedData #typedData = dart._internal::unsafeCast<dart.typed_data::TypedData>(#typedDataBase) in #typedData.{dart.typed_data::TypedData::buffer}{dart.typed_data::ByteBuffer}.{dart.typed_data::ByteBuffer::asUint8List}(#typedData.{dart.typed_data::TypedData::offsetInBytes}{dart.core::int}.{dart.core::num::+}(#offset){(dart.core::num) → dart.core::num}, #C13.{dart.core::List::[]}(dart.ffi::_abi()){(dart.core::int) → dart.core::int*}){([dart.core::int, dart.core::int?]) → dart.typed_data::Uint8List});
+      } =>#typedDataBase is{ForLegacy} dart.ffi::Pointer<dart.ffi::NativeType> ?{dart.core::Object} dart.ffi::_fromAddress<lib::Y>(#typedDataBase.{dart.ffi::Pointer::address}{dart.core::int}.{dart.core::num::+}(#offset){(dart.core::num) → dart.core::num}) : let synthesized dart.typed_data::TypedData #typedData = dart._internal::unsafeCast<dart.typed_data::TypedData>(#typedDataBase) in #typedData.{dart.typed_data::TypedData::buffer}{dart.typed_data::ByteBuffer}.{dart.typed_data::ByteBuffer::asUint8List}(#typedData.{dart.typed_data::TypedData::offsetInBytes}{dart.core::int}.{dart.core::num::+}(#offset){(dart.core::num) → dart.core::num}, #C13.{dart.core::List::[]}(dart.ffi::_abi()){(dart.core::int) → dart.core::int*}){([dart.core::int, dart.core::int?]) → dart.typed_data::Uint8List});
     set xx(lib::Y #externalFieldValue) → void
       return dart.ffi::_memCopy(this.{dart.ffi::_Compound::_typedDataBase}{dart.core::Object}, #C9.{dart.core::List::[]}(dart.ffi::_abi()){(dart.core::int) → dart.core::int*}, #externalFieldValue.{dart.ffi::_Compound::_typedDataBase}{dart.core::Object}, #C8, #C13.{dart.core::List::[]}(dart.ffi::_abi()){(dart.core::int) → dart.core::int*});
     @#C11

pkg/front_end/testcases/incremental/crash_06.yaml.world.1.expect

@@ -33,7 +33,7 @@ library from "org-dartlang-test:///structs.dart" as str {
       return new str::Y::#fromTypedDataBase( block {
         synthesized dart.core::Object #typedDataBase = this.{dart.ffi::_Compound::_typedDataBase}{dart.core::Object};
         synthesized dart.core::int #offset = #C8.{dart.core::List::[]}(dart.ffi::_abi()){(dart.core::int) → dart.core::int*};
-      } =>#typedDataBase is{ForLegacy} dart.ffi::Pointer<dynamic> ?{dart.core::Object} dart.ffi::_fromAddress<str::Y>(#typedDataBase.{dart.ffi::Pointer::address}{dart.core::int}.{dart.core::num::+}(#offset){(dart.core::num) → dart.core::num}) : let synthesized dart.typed_data::TypedData #typedData = dart._internal::unsafeCast<dart.typed_data::TypedData>(#typedDataBase) in #typedData.{dart.typed_data::TypedData::buffer}{dart.typed_data::ByteBuffer}.{dart.typed_data::ByteBuffer::asUint8List}(#typedData.{dart.typed_data::TypedData::offsetInBytes}{dart.core::int}.{dart.core::num::+}(#offset){(dart.core::num) → dart.core::num}, #C8.{dart.core::List::[]}(dart.ffi::_abi()){(dart.core::int) → dart.core::int*}){([dart.core::int, dart.core::int?]) → dart.typed_data::Uint8List});
+      } =>#typedDataBase is{ForLegacy} dart.ffi::Pointer<dart.ffi::NativeType> ?{dart.core::Object} dart.ffi::_fromAddress<str::Y>(#typedDataBase.{dart.ffi::Pointer::address}{dart.core::int}.{dart.core::num::+}(#offset){(dart.core::num) → dart.core::num}) : let synthesized dart.typed_data::TypedData #typedData = dart._internal::unsafeCast<dart.typed_data::TypedData>(#typedDataBase) in #typedData.{dart.typed_data::TypedData::buffer}{dart.typed_data::ByteBuffer}.{dart.typed_data::ByteBuffer::asUint8List}(#typedData.{dart.typed_data::TypedData::offsetInBytes}{dart.core::int}.{dart.core::num::+}(#offset){(dart.core::num) → dart.core::num}, #C8.{dart.core::List::[]}(dart.ffi::_abi()){(dart.core::int) → dart.core::int*}){([dart.core::int, dart.core::int?]) → dart.typed_data::Uint8List});
     set yy(str::Y #externalFieldValue) → void
       return dart.ffi::_memCopy(this.{dart.ffi::_Compound::_typedDataBase}{dart.core::Object}, #C8.{dart.core::List::[]}(dart.ffi::_abi()){(dart.core::int) → dart.core::int*}, #externalFieldValue.{dart.ffi::_Compound::_typedDataBase}{dart.core::Object}, #C7, #C8.{dart.core::List::[]}(dart.ffi::_abi()){(dart.core::int) → dart.core::int*});
     @#C10

pkg/front_end/testcases/incremental/crash_06.yaml.world.2.expect

@@ -33,7 +33,7 @@ library from "org-dartlang-test:///structs.dart" as str {
       return new str::Y::#fromTypedDataBase( block {
         synthesized dart.core::Object #typedDataBase = this.{dart.ffi::_Compound::_typedDataBase}{dart.core::Object};
         synthesized dart.core::int #offset = #C8.{dart.core::List::[]}(dart.ffi::_abi()){(dart.core::int) → dart.core::int*};
-      } =>#typedDataBase is{ForLegacy} dart.ffi::Pointer<dynamic> ?{dart.core::Object} dart.ffi::_fromAddress<str::Y>(#typedDataBase.{dart.ffi::Pointer::address}{dart.core::int}.{dart.core::num::+}(#offset){(dart.core::num) → dart.core::num}) : let synthesized dart.typed_data::TypedData #typedData = dart._internal::unsafeCast<dart.typed_data::TypedData>(#typedDataBase) in #typedData.{dart.typed_data::TypedData::buffer}{dart.typed_data::ByteBuffer}.{dart.typed_data::ByteBuffer::asUint8List}(#typedData.{dart.typed_data::TypedData::offsetInBytes}{dart.core::int}.{dart.core::num::+}(#offset){(dart.core::num) → dart.core::num}, #C8.{dart.core::List::[]}(dart.ffi::_abi()){(dart.core::int) → dart.core::int*}){([dart.core::int, dart.core::int?]) → dart.typed_data::Uint8List});
+      } =>#typedDataBase is{ForLegacy} dart.ffi::Pointer<dart.ffi::NativeType> ?{dart.core::Object} dart.ffi::_fromAddress<str::Y>(#typedDataBase.{dart.ffi::Pointer::address}{dart.core::int}.{dart.core::num::+}(#offset){(dart.core::num) → dart.core::num}) : let synthesized dart.typed_data::TypedData #typedData = dart._internal::unsafeCast<dart.typed_data::TypedData>(#typedDataBase) in #typedData.{dart.typed_data::TypedData::buffer}{dart.typed_data::ByteBuffer}.{dart.typed_data::ByteBuffer::asUint8List}(#typedData.{dart.typed_data::TypedData::offsetInBytes}{dart.core::int}.{dart.core::num::+}(#offset){(dart.core::num) → dart.core::num}, #C8.{dart.core::List::[]}(dart.ffi::_abi()){(dart.core::int) → dart.core::int*}){([dart.core::int, dart.core::int?]) → dart.typed_data::Uint8List});
     set yy(str::Y #externalFieldValue) → void
       return dart.ffi::_memCopy(this.{dart.ffi::_Compound::_typedDataBase}{dart.core::Object}, #C8.{dart.core::List::[]}(dart.ffi::_abi()){(dart.core::int) → dart.core::int*}, #externalFieldValue.{dart.ffi::_Compound::_typedDataBase}{dart.core::Object}, #C7, #C8.{dart.core::List::[]}(dart.ffi::_abi()){(dart.core::int) → dart.core::int*});
     @#C10

pkg/front_end/testcases/incremental/issue_46666.yaml.world.1.expect

@@ -27,7 +27,7 @@ library from "org-dartlang-test:///a.dart" as a {
       return new a::NestedStruct::#fromTypedDataBase( block {
         synthesized dart.core::Object #typedDataBase = this.{dart.ffi::_Compound::_typedDataBase}{dart.core::Object};
         synthesized dart.core::int #offset = #C17.{dart.core::List::[]}(dart.ffi::_abi()){(dart.core::int) → dart.core::int*};
-      } =>#typedDataBase is{ForLegacy} dart.ffi::Pointer<dynamic> ?{dart.core::Object} dart.ffi::_fromAddress<a::NestedStruct>(#typedDataBase.{dart.ffi::Pointer::address}{dart.core::int}.{dart.core::num::+}(#offset){(dart.core::num) → dart.core::num}) : let synthesized dart.typed_data::TypedData #typedData = dart._internal::unsafeCast<dart.typed_data::TypedData>(#typedDataBase) in #typedData.{dart.typed_data::TypedData::buffer}{dart.typed_data::ByteBuffer}.{dart.typed_data::ByteBuffer::asUint8List}(#typedData.{dart.typed_data::TypedData::offsetInBytes}{dart.core::int}.{dart.core::num::+}(#offset){(dart.core::num) → dart.core::num}, #C17.{dart.core::List::[]}(dart.ffi::_abi()){(dart.core::int) → dart.core::int*}){([dart.core::int, dart.core::int?]) → dart.typed_data::Uint8List});
+      } =>#typedDataBase is{ForLegacy} dart.ffi::Pointer<dart.ffi::NativeType> ?{dart.core::Object} dart.ffi::_fromAddress<a::NestedStruct>(#typedDataBase.{dart.ffi::Pointer::address}{dart.core::int}.{dart.core::num::+}(#offset){(dart.core::num) → dart.core::num}) : let synthesized dart.typed_data::TypedData #typedData = dart._internal::unsafeCast<dart.typed_data::TypedData>(#typedDataBase) in #typedData.{dart.typed_data::TypedData::buffer}{dart.typed_data::ByteBuffer}.{dart.typed_data::ByteBuffer::asUint8List}(#typedData.{dart.typed_data::TypedData::offsetInBytes}{dart.core::int}.{dart.core::num::+}(#offset){(dart.core::num) → dart.core::num}, #C17.{dart.core::List::[]}(dart.ffi::_abi()){(dart.core::int) → dart.core::int*}){([dart.core::int, dart.core::int?]) → dart.typed_data::Uint8List});
     set blah(a::NestedStruct #externalFieldValue) → void
       return dart.ffi::_memCopy(this.{dart.ffi::_Compound::_typedDataBase}{dart.core::Object}, #C17.{dart.core::List::[]}(dart.ffi::_abi()){(dart.core::int) → dart.core::int*}, #externalFieldValue.{dart.ffi::_Compound::_typedDataBase}{dart.core::Object}, #C8, #C17.{dart.core::List::[]}(dart.ffi::_abi()){(dart.core::int) → dart.core::int*});
     @#C19
@@ -78,7 +78,7 @@ library from "org-dartlang-test:///b.dart" as b {
       return new a::StructA::#fromTypedDataBase( block {
         synthesized dart.core::Object #typedDataBase = this.{dart.ffi::_Compound::_typedDataBase}{dart.core::Object};
         synthesized dart.core::int #offset = #C9.{dart.core::List::[]}(dart.ffi::_abi()){(dart.core::int) → dart.core::int*};
-      } =>#typedDataBase is{ForLegacy} dart.ffi::Pointer<dynamic> ?{dart.core::Object} dart.ffi::_fromAddress<a::StructA>(#typedDataBase.{dart.ffi::Pointer::address}{dart.core::int}.{dart.core::num::+}(#offset){(dart.core::num) → dart.core::num}) : let synthesized dart.typed_data::TypedData #typedData = dart._internal::unsafeCast<dart.typed_data::TypedData>(#typedDataBase) in #typedData.{dart.typed_data::TypedData::buffer}{dart.typed_data::ByteBuffer}.{dart.typed_data::ByteBuffer::asUint8List}(#typedData.{dart.typed_data::TypedData::offsetInBytes}{dart.core::int}.{dart.core::num::+}(#offset){(dart.core::num) → dart.core::num}, #C21.{dart.core::List::[]}(dart.ffi::_abi()){(dart.core::int) → dart.core::int*}){([dart.core::int, dart.core::int?]) → dart.typed_data::Uint8List});
+      } =>#typedDataBase is{ForLegacy} dart.ffi::Pointer<dart.ffi::NativeType> ?{dart.core::Object} dart.ffi::_fromAddress<a::StructA>(#typedDataBase.{dart.ffi::Pointer::address}{dart.core::int}.{dart.core::num::+}(#offset){(dart.core::num) → dart.core::num}) : let synthesized dart.typed_data::TypedData #typedData = dart._internal::unsafeCast<dart.typed_data::TypedData>(#typedDataBase) in #typedData.{dart.typed_data::TypedData::buffer}{dart.typed_data::ByteBuffer}.{dart.typed_data::ByteBuffer::asUint8List}(#typedData.{dart.typed_data::TypedData::offsetInBytes}{dart.core::int}.{dart.core::num::+}(#offset){(dart.core::num) → dart.core::num}, #C21.{dart.core::List::[]}(dart.ffi::_abi()){(dart.core::int) → dart.core::int*}){([dart.core::int, dart.core::int?]) → dart.typed_data::Uint8List});
     set b1(a::StructA #externalFieldValue) → void
       return dart.ffi::_memCopy(this.{dart.ffi::_Compound::_typedDataBase}{dart.core::Object}, #C9.{dart.core::List::[]}(dart.ffi::_abi()){(dart.core::int) → dart.core::int*}, #externalFieldValue.{dart.ffi::_Compound::_typedDataBase}{dart.core::Object}, #C8, #C21.{dart.core::List::[]}(dart.ffi::_abi()){(dart.core::int) → dart.core::int*});
     @#C19

pkg/front_end/testcases/incremental/issue_46666.yaml.world.2.expect

@@ -27,7 +27,7 @@ library from "org-dartlang-test:///a.dart" as a {
       return new a::NestedStruct::#fromTypedDataBase( block {
         synthesized dart.core::Object #typedDataBase = this.{dart.ffi::_Compound::_typedDataBase}{dart.core::Object};
         synthesized dart.core::int #offset = #C17.{dart.core::List::[]}(dart.ffi::_abi()){(dart.core::int) → dart.core::int*};
-      } =>#typedDataBase is{ForLegacy} dart.ffi::Pointer<dynamic> ?{dart.core::Object} dart.ffi::_fromAddress<a::NestedStruct>(#typedDataBase.{dart.ffi::Pointer::address}{dart.core::int}.{dart.core::num::+}(#offset){(dart.core::num) → dart.core::num}) : let synthesized dart.typed_data::TypedData #typedData = dart._internal::unsafeCast<dart.typed_data::TypedData>(#typedDataBase) in #typedData.{dart.typed_data::TypedData::buffer}{dart.typed_data::ByteBuffer}.{dart.typed_data::ByteBuffer::asUint8List}(#typedData.{dart.typed_data::TypedData::offsetInBytes}{dart.core::int}.{dart.core::num::+}(#offset){(dart.core::num) → dart.core::num}, #C17.{dart.core::List::[]}(dart.ffi::_abi()){(dart.core::int) → dart.core::int*}){([dart.core::int, dart.core::int?]) → dart.typed_data::Uint8List});
+      } =>#typedDataBase is{ForLegacy} dart.ffi::Pointer<dart.ffi::NativeType> ?{dart.core::Object} dart.ffi::_fromAddress<a::NestedStruct>(#typedDataBase.{dart.ffi::Pointer::address}{dart.core::int}.{dart.core::num::+}(#offset){(dart.core::num) → dart.core::num}) : let synthesized dart.typed_data::TypedData #typedData = dart._internal::unsafeCast<dart.typed_data::TypedData>(#typedDataBase) in #typedData.{dart.typed_data::TypedData::buffer}{dart.typed_data::ByteBuffer}.{dart.typed_data::ByteBuffer::asUint8List}(#typedData.{dart.typed_data::TypedData::offsetInBytes}{dart.core::int}.{dart.core::num::+}(#offset){(dart.core::num) → dart.core::num}, #C17.{dart.core::List::[]}(dart.ffi::_abi()){(dart.core::int) → dart.core::int*}){([dart.core::int, dart.core::int?]) → dart.typed_data::Uint8List});
     set blah(a::NestedStruct #externalFieldValue) → void
       return dart.ffi::_memCopy(this.{dart.ffi::_Compound::_typedDataBase}{dart.core::Object}, #C17.{dart.core::List::[]}(dart.ffi::_abi()){(dart.core::int) → dart.core::int*}, #externalFieldValue.{dart.ffi::_Compound::_typedDataBase}{dart.core::Object}, #C8, #C17.{dart.core::List::[]}(dart.ffi::_abi()){(dart.core::int) → dart.core::int*});
     @#C19
@@ -78,7 +78,7 @@ library from "org-dartlang-test:///b.dart" as b {
       return new a::StructA::#fromTypedDataBase( block {
         synthesized dart.core::Object #typedDataBase = this.{dart.ffi::_Compound::_typedDataBase}{dart.core::Object};
         synthesized dart.core::int #offset = #C9.{dart.core::List::[]}(dart.ffi::_abi()){(dart.core::int) → dart.core::int*};
-      } =>#typedDataBase is{ForLegacy} dart.ffi::Pointer<dynamic> ?{dart.core::Object} dart.ffi::_fromAddress<a::StructA>(#typedDataBase.{dart.ffi::Pointer::address}{dart.core::int}.{dart.core::num::+}(#offset){(dart.core::num) → dart.core::num}) : let synthesized dart.typed_data::TypedData #typedData = dart._internal::unsafeCast<dart.typed_data::TypedData>(#typedDataBase) in #typedData.{dart.typed_data::TypedData::buffer}{dart.typed_data::ByteBuffer}.{dart.typed_data::ByteBuffer::asUint8List}(#typedData.{dart.typed_data::TypedData::offsetInBytes}{dart.core::int}.{dart.core::num::+}(#offset){(dart.core::num) → dart.core::num}, #C21.{dart.core::List::[]}(dart.ffi::_abi()){(dart.core::int) → dart.core::int*}){([dart.core::int, dart.core::int?]) → dart.typed_data::Uint8List});
+      } =>#typedDataBase is{ForLegacy} dart.ffi::Pointer<dart.ffi::NativeType> ?{dart.core::Object} dart.ffi::_fromAddress<a::StructA>(#typedDataBase.{dart.ffi::Pointer::address}{dart.core::int}.{dart.core::num::+}(#offset){(dart.core::num) → dart.core::num}) : let synthesized dart.typed_data::TypedData #typedData = dart._internal::unsafeCast<dart.typed_data::TypedData>(#typedDataBase) in #typedData.{dart.typed_data::TypedData::buffer}{dart.typed_data::ByteBuffer}.{dart.typed_data::ByteBuffer::asUint8List}(#typedData.{dart.typed_data::TypedData::offsetInBytes}{dart.core::int}.{dart.core::num::+}(#offset){(dart.core::num) → dart.core::num}, #C21.{dart.core::List::[]}(dart.ffi::_abi()){(dart.core::int) → dart.core::int*}){([dart.core::int, dart.core::int?]) → dart.typed_data::Uint8List});
     set b1(a::StructA #externalFieldValue) → void
       return dart.ffi::_memCopy(this.{dart.ffi::_Compound::_typedDataBase}{dart.core::Object}, #C9.{dart.core::List::[]}(dart.ffi::_abi()){(dart.core::int) → dart.core::int*}, #externalFieldValue.{dart.ffi::_Compound::_typedDataBase}{dart.core::Object}, #C8, #C21.{dart.core::List::[]}(dart.ffi::_abi()){(dart.core::int) → dart.core::int*});
     @#C19