Alexander Markov
a7f7c0c5ac
TEST=tests/ffi/function_callbacks_test.dart TEST=Manual run of vm-kernel-precomp-linux-debug-x64-try with --test_il_serialization enabled. Issue: https://github.com/dart-lang/sdk/issues/43299 Change-Id: Ia57021d9091e8a80de3645cb4723ebdbb5a3d33d Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/256371 Commit-Queue: Alexander Markov <alexmarkov@google.com> Reviewed-by: Daco Harkes <dacoharkes@google.com>
97 lines
3.9 KiB
C++
97 lines
3.9 KiB
C++
// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
|
|
// for details. All rights reserved. Use of this source code is governed by a
|
|
// BSD-style license that can be found in the LICENSE file.
|
|
|
|
#include "vm/compiler/ffi/callback.h"
|
|
|
|
#include "vm/canonical_tables.h"
|
|
#include "vm/class_finalizer.h"
|
|
#include "vm/object_store.h"
|
|
#include "vm/symbols.h"
|
|
|
|
namespace dart {
|
|
|
|
namespace compiler {
|
|
|
|
namespace ffi {
|
|
|
|
FunctionPtr NativeCallbackFunction(const FunctionType& c_signature,
|
|
const Function& dart_target,
|
|
const Instance& exceptional_return,
|
|
bool register_function) {
|
|
Thread* const thread = Thread::Current();
|
|
Zone* const zone = thread->zone();
|
|
Function& function = Function::Handle(zone);
|
|
ASSERT(c_signature.IsCanonical());
|
|
ASSERT(exceptional_return.IsSmi() || exceptional_return.IsCanonical());
|
|
|
|
// Create a new Function named '<target>_FfiCallback' and stick it in the
|
|
// 'dart:ffi' library. Note that these functions will never be invoked by
|
|
// Dart, so they may have duplicate names.
|
|
const auto& name = String::Handle(
|
|
zone, Symbols::FromConcat(thread, Symbols::FfiCallback(),
|
|
String::Handle(zone, dart_target.name())));
|
|
const Library& lib = Library::Handle(zone, Library::FfiLibrary());
|
|
const Class& owner_class = Class::Handle(zone, lib.toplevel_class());
|
|
auto& signature = FunctionType::Handle(zone, FunctionType::New());
|
|
function =
|
|
Function::New(signature, name, UntaggedFunction::kFfiTrampoline,
|
|
/*is_static=*/true,
|
|
/*is_const=*/false,
|
|
/*is_abstract=*/false,
|
|
/*is_external=*/false,
|
|
/*is_native=*/false, owner_class, TokenPosition::kNoSource);
|
|
function.set_is_debuggable(false);
|
|
|
|
// Set callback-specific fields which the flow-graph builder needs to generate
|
|
// the body.
|
|
function.SetFfiCSignature(c_signature);
|
|
function.SetFfiCallbackTarget(dart_target);
|
|
|
|
// We need to load the exceptional return value as a constant in the generated
|
|
// function. Even though the FE ensures that it is a constant, it could still
|
|
// be a literal allocated in new space. We need to copy it into old space in
|
|
// that case.
|
|
//
|
|
// Exceptional return values currently cannot be pointers because we don't
|
|
// have constant pointers.
|
|
ASSERT(exceptional_return.IsNull() || exceptional_return.IsNumber() ||
|
|
exceptional_return.IsBool());
|
|
if (!exceptional_return.IsSmi() && exceptional_return.IsNew()) {
|
|
function.SetFfiCallbackExceptionalReturn(Instance::Handle(
|
|
zone, exceptional_return.CopyShallowToOldSpace(thread)));
|
|
} else {
|
|
function.SetFfiCallbackExceptionalReturn(exceptional_return);
|
|
}
|
|
|
|
// The dart type of the FfiCallback has no arguments or type arguments and
|
|
// has a result type of dynamic, as the callback is never invoked via Dart,
|
|
// only via native calls that do not use this information. Having no Dart
|
|
// arguments ensures the scope builder does not add inappropriate parameter
|
|
// variables.
|
|
signature.set_result_type(Object::dynamic_type());
|
|
// Finalize (and thus canonicalize) the signature.
|
|
signature ^= ClassFinalizer::FinalizeType(signature);
|
|
function.SetSignature(signature);
|
|
|
|
if (register_function) {
|
|
ObjectStore* object_store = thread->isolate_group()->object_store();
|
|
if (object_store->ffi_callback_functions() == Array::null()) {
|
|
FfiCallbackFunctionSet set(
|
|
HashTables::New<FfiCallbackFunctionSet>(/*initial_capacity=*/4));
|
|
object_store->set_ffi_callback_functions(set.Release());
|
|
}
|
|
FfiCallbackFunctionSet set(object_store->ffi_callback_functions());
|
|
function ^= set.InsertOrGet(function);
|
|
object_store->set_ffi_callback_functions(set.Release());
|
|
}
|
|
|
|
return function.ptr();
|
|
}
|
|
|
|
} // namespace ffi
|
|
|
|
} // namespace compiler
|
|
|
|
} // namespace dart
|