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// 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/call.h"
#include "vm/class_finalizer.h"
#include "vm/symbols.h"
namespace dart {
namespace compiler {
namespace ffi {
// TODO(dartbug.com/36607): Cache the trampolines.
FunctionPtr TrampolineFunction(const FunctionType& dart_signature,
const FunctionType& c_signature,
bool is_leaf) {
Thread* thread = Thread::Current();
Zone* zone = thread->zone();
String& name = String::Handle(zone, Symbols::New(thread, "FfiTrampoline"));
const Library& lib = Library::Handle(zone, Library::FfiLibrary());
const Class& owner_class = Class::Handle(zone, lib.toplevel_class());
FunctionType& signature = FunctionType::Handle(zone, FunctionType::New());
Function& function = Function::Handle(
zone, Function::New(signature, name, UntaggedFunction::kFfiTrampoline,
/*is_static=*/true,
/*is_const=*/false,
/*is_abstract=*/false,
/*is_external=*/false,
/*is_native=*/false, owner_class,
TokenPosition::kMinSource));
function.set_is_debuggable(false);
// Trampolines have no optional arguments.
const intptr_t num_fixed = dart_signature.num_fixed_parameters();
signature.set_num_fixed_parameters(num_fixed);
signature.set_result_type(
AbstractType::Handle(zone, dart_signature.result_type()));
signature.set_parameter_types(
Array::Handle(zone, dart_signature.parameter_types()));
// Create unique names for the parameters, as they are used in scope building
// and error messages.
if (num_fixed > 0) {
function.CreateNameArray();
function.SetParameterNameAt(0, Symbols::ClosureParameter());
for (intptr_t i = 1; i < num_fixed; i++) {
name = Symbols::NewFormatted(thread, ":ffi_param%" Pd, i);
function.SetParameterNameAt(i, name);
}
}
function.SetFfiCSignature(c_signature);
signature ^= ClassFinalizer::FinalizeType(signature);
function.SetSignature(signature);
function.SetFfiIsLeaf(is_leaf);
return function.ptr();
}
} // namespace ffi
} // namespace compiler
} // namespace dart