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Ben Konyi c262cbd414 Revert "[vm/ffi] Enable creating an ExternalTypedData from a Pointer." 
This reverts commit ddd83d256f.

Reason for revert: Causing build failures in the Flutter engine, blocking the SDK roll. Build error:

org-dartlang-sdk:///third_party/dart/runtime/lib/ffi_patch.dart:76:3: Error: Type 'TypedData' not found.
  TypedData asExternalTypedData({int count: 1}) =>
  ^^^^^^^^^



Original change's description:
> [vm/ffi] Enable creating an ExternalTypedData from a Pointer.
> 
> Fixes dartbug.com/37738
> 
> Change-Id: I65c6741978d36cd1c255039a4dd8a06190ea4366
> Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/111736
> Commit-Queue: Samir Jindel <sjindel@google.com>
> Reviewed-by: Daco Harkes <dacoharkes@google.com>

TBR=vegorov@google.com,sjindel@google.com,dacoharkes@google.com

Change-Id: I90a9cb5e2894c0bc064e620cef0a0f51505ac05d
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/112047
Reviewed-by: Ben Konyi <bkonyi@google.com>
Commit-Queue: Ben Konyi <bkonyi@google.com>
2019-08-06 19:52:11 +00:00

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// Copyright (c) 2019, 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 "lib/ffi.h"
#include "include/dart_api.h"
#include "platform/globals.h"
#include "vm/bootstrap_natives.h"
#include "vm/class_finalizer.h"
#include "vm/class_id.h"
#include "vm/compiler/assembler/assembler.h"
#include "vm/compiler/ffi.h"
#include "vm/compiler/jit/compiler.h"
#include "vm/exceptions.h"
#include "vm/flags.h"
#include "vm/log.h"
#include "vm/native_arguments.h"
#include "vm/native_entry.h"
#include "vm/object.h"
#include "vm/object_store.h"
#include "vm/symbols.h"
namespace dart {
// The following functions are runtime checks on type arguments.
// Some checks are also performed in kernel transformation, these are asserts.
// Some checks are only performed at runtime to allow for generic code, these
// throw ArgumentExceptions.
static bool IsPointerType(const AbstractType& type) {
return RawObject::IsFfiPointerClassId(type.type_class_id());
}
static void CheckSized(const AbstractType& type_arg) {
const classid_t type_cid = type_arg.type_class_id();
if (RawObject::IsFfiNativeTypeTypeClassId(type_cid) ||
RawObject::IsFfiTypeVoidClassId(type_cid) ||
RawObject::IsFfiTypeNativeFunctionClassId(type_cid)) {
const String& error = String::Handle(String::NewFormatted(
"%s does not have a predefined size (@unsized). "
"Unsized NativeTypes do not support [sizeOf] because their size "
"is unknown. "
"Consequently, [allocate], [Pointer.load], [Pointer.store], and "
"[Pointer.elementAt] are not available.",
String::Handle(type_arg.UserVisibleName()).ToCString()));
Exceptions::ThrowArgumentError(error);
}
}
enum class FfiVariance { kCovariant = 0, kContravariant = 1 };
// Checks that a dart type correspond to a [NativeType].
// Because this is checked already in a kernel transformation, it does not throw
// an ArgumentException but a boolean which should be asserted.
//
// [Int8] -> [int]
// [Int16] -> [int]
// [Int32] -> [int]
// [Int64] -> [int]
// [Uint8] -> [int]
// [Uint16] -> [int]
// [Uint32] -> [int]
// [Uint64] -> [int]
// [IntPtr] -> [int]
// [Double] -> [double]
// [Float] -> [double]
// [Pointer]<T> -> [Pointer]<T>
// T extends [Struct] -> T
// [NativeFunction]<T1 Function(T2, T3) -> S1 Function(S2, S3)
// where DartRepresentationOf(Tn) -> Sn
static bool DartAndCTypeCorrespond(const AbstractType& native_type,
const AbstractType& dart_type,
FfiVariance variance) {
classid_t native_type_cid = native_type.type_class_id();
if (RawObject::IsFfiTypeIntClassId(native_type_cid)) {
return dart_type.IsSubtypeOf(AbstractType::Handle(Type::IntType()),
Heap::kNew);
}
if (RawObject::IsFfiTypeDoubleClassId(native_type_cid)) {
return dart_type.IsSubtypeOf(AbstractType::Handle(Type::Double()),
Heap::kNew);
}
if (RawObject::IsFfiPointerClassId(native_type_cid)) {
return (variance == FfiVariance::kCovariant &&
dart_type.IsSubtypeOf(native_type, Heap::kNew)) ||
(variance == FfiVariance::kContravariant &&
native_type.IsSubtypeOf(dart_type, Heap::kNew)) ||
dart_type.IsNullType();
}
if (RawObject::IsFfiTypeNativeFunctionClassId(native_type_cid)) {
if (!dart_type.IsFunctionType()) {
return false;
}
TypeArguments& nativefunction_type_args =
TypeArguments::Handle(native_type.arguments());
AbstractType& nativefunction_type_arg =
AbstractType::Handle(nativefunction_type_args.TypeAt(0));
if (!nativefunction_type_arg.IsFunctionType()) {
return false;
}
Function& dart_function =
Function::Handle((Type::Cast(dart_type)).signature());
if (dart_function.NumTypeParameters() != 0 ||
dart_function.HasOptionalPositionalParameters() ||
dart_function.HasOptionalNamedParameters()) {
return false;
}
Function& nativefunction_function =
Function::Handle(((Type&)nativefunction_type_arg).signature());
if (nativefunction_function.NumTypeParameters() != 0 ||
nativefunction_function.HasOptionalPositionalParameters() ||
nativefunction_function.HasOptionalNamedParameters()) {
return false;
}
if (!(dart_function.NumParameters() ==
nativefunction_function.NumParameters())) {
return false;
}
if (!DartAndCTypeCorrespond(
AbstractType::Handle(nativefunction_function.result_type()),
AbstractType::Handle(dart_function.result_type()), variance)) {
return false;
}
for (intptr_t i = 0; i < dart_function.NumParameters(); i++) {
if (!DartAndCTypeCorrespond(
AbstractType::Handle(nativefunction_function.ParameterTypeAt(i)),
AbstractType::Handle(dart_function.ParameterTypeAt(i)),
variance)) {
return false;
}
}
}
return true;
}
static void CheckDartAndCTypeCorrespond(const AbstractType& native_type,
const AbstractType& dart_type,
FfiVariance variance) {
if (!DartAndCTypeCorrespond(native_type, dart_type, variance)) {
const String& error = String::Handle(String::NewFormatted(
"Expected type '%s' to be different, it should be "
"DartRepresentationOf('%s').",
String::Handle(dart_type.UserVisibleName()).ToCString(),
String::Handle(native_type.UserVisibleName()).ToCString()));
Exceptions::ThrowArgumentError(error);
}
}
// The following functions are runtime checks on arguments.
static const Pointer& AsPointer(const Instance& instance) {
if (!instance.IsPointer()) {
const String& error = String::Handle(String::NewFormatted(
"Expected a Pointer object but found %s", instance.ToCString()));
Exceptions::ThrowArgumentError(error);
}
return Pointer::Cast(instance);
}
static const Integer& AsInteger(const Instance& instance) {
if (!instance.IsInteger()) {
const String& error = String::Handle(String::NewFormatted(
"Expected an int but found %s", instance.ToCString()));
Exceptions::ThrowArgumentError(error);
}
return Integer::Cast(instance);
}
static const Double& AsDouble(const Instance& instance) {
if (!instance.IsDouble()) {
const String& error = String::Handle(String::NewFormatted(
"Expected a double but found %s", instance.ToCString()));
Exceptions::ThrowArgumentError(error);
}
return Double::Cast(instance);
}
// Calcuate the size of a native type.
//
// You must check [IsConcreteNativeType] and [CheckSized] first to verify that
// this type has a defined size.
static size_t SizeOf(const AbstractType& type) {
if (RawObject::IsFfiTypeClassId(type.type_class_id())) {
return compiler::ffi::ElementSizeInBytes(type.type_class_id());
} else {
Class& struct_class = Class::Handle(type.type_class());
Object& result = Object::Handle(
struct_class.InvokeGetter(Symbols::SizeOfStructField(),
/*throw_nsm_if_absent=*/false,
/*respect_reflectable=*/false));
ASSERT(!result.IsNull() && result.IsInteger());
return Integer::Cast(result).AsInt64Value();
}
}
// The remainder of this file implements the dart:ffi native methods.
DEFINE_NATIVE_ENTRY(Ffi_allocate, 1, 1) {
GET_NATIVE_TYPE_ARGUMENT(type_arg, arguments->NativeTypeArgAt(0));
CheckSized(type_arg);
size_t element_size = SizeOf(type_arg);
GET_NON_NULL_NATIVE_ARGUMENT(Integer, argCount, arguments->NativeArgAt(0));
int64_t count = argCount.AsInt64Value();
size_t size = element_size * count; // Truncates overflow.
size_t memory = reinterpret_cast<size_t>(malloc(size));
if (memory == 0) {
const String& error = String::Handle(String::NewFormatted(
"allocating (%" Pd ") bytes of memory failed", size));
Exceptions::ThrowArgumentError(error);
}
RawPointer* result = Pointer::New(type_arg, memory);
return result;
}
DEFINE_NATIVE_ENTRY(Ffi_fromAddress, 1, 1) {
GET_NATIVE_TYPE_ARGUMENT(type_arg, arguments->NativeTypeArgAt(0));
GET_NON_NULL_NATIVE_ARGUMENT(Integer, arg_ptr, arguments->NativeArgAt(0));
return Pointer::New(type_arg, arg_ptr.AsInt64Value());
}
DEFINE_NATIVE_ENTRY(Ffi_elementAt, 0, 2) {
GET_NON_NULL_NATIVE_ARGUMENT(Pointer, pointer, arguments->NativeArgAt(0));
GET_NON_NULL_NATIVE_ARGUMENT(Integer, index, arguments->NativeArgAt(1));
AbstractType& pointer_type_arg =
AbstractType::Handle(zone, pointer.type_argument());
CheckSized(pointer_type_arg);
return Pointer::New(pointer_type_arg,
pointer.NativeAddress() +
index.AsInt64Value() * SizeOf(pointer_type_arg));
}
DEFINE_NATIVE_ENTRY(Ffi_offsetBy, 0, 2) {
GET_NON_NULL_NATIVE_ARGUMENT(Pointer, pointer, arguments->NativeArgAt(0));
GET_NON_NULL_NATIVE_ARGUMENT(Integer, offset, arguments->NativeArgAt(1));
AbstractType& pointer_type_arg =
AbstractType::Handle(pointer.type_argument());
return Pointer::New(pointer_type_arg,
pointer.NativeAddress() + offset.AsInt64Value());
}
DEFINE_NATIVE_ENTRY(Ffi_cast, 1, 1) {
GET_NON_NULL_NATIVE_ARGUMENT(Pointer, pointer, arguments->NativeArgAt(0));
GET_NATIVE_TYPE_ARGUMENT(type_arg, arguments->NativeTypeArgAt(0));
return Pointer::New(type_arg, pointer.NativeAddress());
}
DEFINE_NATIVE_ENTRY(Ffi_free, 0, 1) {
GET_NON_NULL_NATIVE_ARGUMENT(Pointer, pointer, arguments->NativeArgAt(0));
free(reinterpret_cast<void*>(pointer.NativeAddress()));
pointer.SetNativeAddress(0);
return Object::null();
}
DEFINE_NATIVE_ENTRY(Ffi_address, 0, 1) {
GET_NON_NULL_NATIVE_ARGUMENT(Pointer, pointer, arguments->NativeArgAt(0));
return Integer::New(pointer.NativeAddress());
}
static RawObject* LoadValue(Zone* zone,
const Pointer& target,
const AbstractType& instance_type_arg) {
classid_t type_cid = instance_type_arg.type_class_id();
size_t address = target.NativeAddress();
switch (type_cid) {
case kFfiInt8Cid:
return Integer::New(*reinterpret_cast<int8_t*>(address));
case kFfiInt16Cid:
return Integer::New(*reinterpret_cast<int16_t*>(address));
case kFfiInt32Cid:
return Integer::New(*reinterpret_cast<int32_t*>(address));
case kFfiInt64Cid:
return Integer::New(*reinterpret_cast<int64_t*>(address));
case kFfiUint8Cid:
return Integer::NewFromUint64(*reinterpret_cast<uint8_t*>(address));
case kFfiUint16Cid:
return Integer::NewFromUint64(*reinterpret_cast<uint16_t*>(address));
case kFfiUint32Cid:
return Integer::NewFromUint64(*reinterpret_cast<uint32_t*>(address));
case kFfiUint64Cid:
return Integer::NewFromUint64(*reinterpret_cast<uint64_t*>(address));
case kFfiIntPtrCid:
return Integer::New(*reinterpret_cast<intptr_t*>(address));
case kFfiFloatCid:
return Double::New(*reinterpret_cast<float_t*>(address));
case kFfiDoubleCid:
return Double::New(*reinterpret_cast<double_t*>(address));
default: {
if (IsPointerType(instance_type_arg)) {
const AbstractType& type_arg = AbstractType::Handle(
TypeArguments::Handle(instance_type_arg.arguments())
.TypeAt(Pointer::kNativeTypeArgPos));
return Pointer::New(type_arg, reinterpret_cast<size_t>(
*reinterpret_cast<void**>(address)));
} else {
// Result is a struct class -- find <class name>.#fromPointer
// constructor and call it.
Class& cls = Class::Handle(zone, instance_type_arg.type_class());
const Function& constructor =
Function::Handle(cls.LookupFunctionAllowPrivate(String::Handle(
String::Concat(String::Handle(String::Concat(
String::Handle(cls.Name()), Symbols::Dot())),
Symbols::StructFromPointer()))));
ASSERT(!constructor.IsNull());
ASSERT(constructor.IsGenerativeConstructor());
ASSERT(!Object::Handle(constructor.VerifyCallEntryPoint()).IsError());
Instance& new_object = Instance::Handle(Instance::New(cls));
new_object.SetTypeArguments(
TypeArguments::Handle(instance_type_arg.arguments()));
ASSERT(cls.is_allocated() ||
Dart::vm_snapshot_kind() != Snapshot::kFullAOT);
const Array& args = Array::Handle(zone, Array::New(2));
args.SetAt(0, new_object);
args.SetAt(1, target);
Object& constructorResult =
Object::Handle(DartEntry::InvokeFunction(constructor, args));
ASSERT(!constructorResult.IsError());
return new_object.raw();
}
}
}
}
DEFINE_NATIVE_ENTRY(Ffi_load, 1, 1) {
GET_NON_NULL_NATIVE_ARGUMENT(Pointer, pointer, arguments->NativeArgAt(0));
GET_NATIVE_TYPE_ARGUMENT(type_arg, arguments->NativeTypeArgAt(0));
AbstractType& pointer_type_arg =
AbstractType::Handle(pointer.type_argument());
CheckSized(pointer_type_arg);
CheckDartAndCTypeCorrespond(pointer_type_arg, type_arg,
FfiVariance::kContravariant);
return LoadValue(zone, pointer, pointer_type_arg);
}
static void StoreValue(Zone* zone,
const Pointer& pointer,
classid_t type_cid,
const Instance& new_value) {
uint8_t* const address = reinterpret_cast<uint8_t*>(pointer.NativeAddress());
AbstractType& pointer_type_arg =
AbstractType::Handle(pointer.type_argument());
switch (type_cid) {
case kFfiInt8Cid:
*reinterpret_cast<int8_t*>(address) = AsInteger(new_value).AsInt64Value();
break;
case kFfiInt16Cid:
*reinterpret_cast<int16_t*>(address) =
AsInteger(new_value).AsInt64Value();
break;
case kFfiInt32Cid:
*reinterpret_cast<int32_t*>(address) =
AsInteger(new_value).AsInt64Value();
break;
case kFfiInt64Cid:
*reinterpret_cast<int64_t*>(address) =
AsInteger(new_value).AsInt64Value();
break;
case kFfiUint8Cid:
*reinterpret_cast<uint8_t*>(address) =
AsInteger(new_value).AsInt64Value();
break;
case kFfiUint16Cid:
*reinterpret_cast<uint16_t*>(address) =
AsInteger(new_value).AsInt64Value();
break;
case kFfiUint32Cid:
*reinterpret_cast<uint32_t*>(address) =
AsInteger(new_value).AsInt64Value();
break;
case kFfiUint64Cid:
*reinterpret_cast<uint64_t*>(address) =
AsInteger(new_value).AsInt64Value();
break;
case kFfiIntPtrCid:
*reinterpret_cast<intptr_t*>(address) =
AsInteger(new_value).AsInt64Value();
break;
case kFfiFloatCid:
*reinterpret_cast<float*>(address) = AsDouble(new_value).value();
break;
case kFfiDoubleCid:
*reinterpret_cast<double*>(address) = AsDouble(new_value).value();
break;
case kFfiPointerCid: {
ASSERT(IsPointerType(pointer_type_arg));
ASSERT(new_value.IsPointer());
const void* const stored =
reinterpret_cast<void*>(AsPointer(new_value).NativeAddress());
*reinterpret_cast<const void**>(address) = stored;
break;
}
default:
UNREACHABLE();
}
}
DEFINE_NATIVE_ENTRY(Ffi_store, 0, 2) {
GET_NON_NULL_NATIVE_ARGUMENT(Pointer, pointer, arguments->NativeArgAt(0));
GET_NATIVE_ARGUMENT(Instance, new_value, arguments->NativeArgAt(1));
AbstractType& arg_type = AbstractType::Handle(new_value.GetType(Heap::kNew));
AbstractType& pointer_type_arg =
AbstractType::Handle(pointer.type_argument());
CheckSized(pointer_type_arg);
CheckDartAndCTypeCorrespond(pointer_type_arg, arg_type,
FfiVariance::kCovariant);
if (new_value.IsNull()) {
const String& error = String::Handle(
String::NewFormatted("Argument to Pointer.store is null."));
Exceptions::ThrowArgumentError(error);
}
classid_t type_cid = pointer_type_arg.type_class_id();
StoreValue(zone, pointer, type_cid, new_value);
return Object::null();
}
DEFINE_NATIVE_ENTRY(Ffi_sizeOf, 1, 0) {
GET_NATIVE_TYPE_ARGUMENT(type_arg, arguments->NativeTypeArgAt(0));
CheckSized(type_arg);
return Integer::New(SizeOf(type_arg));
}
#if !defined(DART_PRECOMPILED_RUNTIME) && !defined(DART_PRECOMPILER) && \
!defined(TARGET_ARCH_DBC)
// Generates assembly to trampoline from native code into Dart.
static uword CompileNativeCallback(const Function& c_signature,
const Function& dart_target,
const Instance& exceptional_return) {
Thread* const thread = Thread::Current();
const int32_t callback_id = thread->AllocateFfiCallbackId();
// Create a new Function named 'FfiCallback' and stick it in the 'dart:ffi'
// library. Note that these functions will never be invoked by Dart, so it
// doesn't matter that they all have the same name.
Zone* const Z = thread->zone();
const String& name = String::Handle(Symbols::New(thread, "FfiCallback"));
const Library& lib = Library::Handle(Z, Library::FfiLibrary());
const Class& owner_class = Class::Handle(Z, lib.toplevel_class());
const Function& function =
Function::Handle(Z, Function::New(name, RawFunction::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);
// Set callback-specific fields which the flow-graph builder needs to generate
// the body.
function.SetFfiCSignature(c_signature);
function.SetFfiCallbackId(callback_id);
function.SetFfiCallbackTarget(dart_target);
// We require that the exceptional return value for functions returning 'Void'
// must be 'null', since native code should not look at the result.
if (compiler::ffi::NativeTypeIsVoid(
AbstractType::Handle(c_signature.result_type())) &&
!exceptional_return.IsNull()) {
Exceptions::ThrowUnsupportedError(
"Only 'null' may be used as the exceptional return value for a "
"callback returning void.");
}
// We need to load the exceptional return value as a constant in the generated
// function. This means we need to ensure that it's in old space and has no
// (transitively) mutable fields. This is done by checking (asserting) that
// it's a built-in FFI class, whose fields are all immutable, or a
// user-defined Pointer class, which has no fields.
//
// TODO(36730): We'll need to extend this when we support passing/returning
// structs by value.
ASSERT(exceptional_return.IsNull() || exceptional_return.IsNumber() ||
exceptional_return.IsPointer());
if (!exceptional_return.IsSmi() && exceptional_return.IsNew()) {
function.SetFfiCallbackExceptionalReturn(
Instance::Handle(exceptional_return.CopyShallowToOldSpace(thread)));
} else {
function.SetFfiCallbackExceptionalReturn(exceptional_return);
}
// We compile the callback immediately because we need to return a pointer to
// the entry-point. Native calls do not use patching like Dart calls, so we
// cannot compile it lazily.
const Object& result =
Object::Handle(Z, Compiler::CompileOptimizedFunction(thread, function));
if (result.IsError()) {
Exceptions::PropagateError(Error::Cast(result));
}
ASSERT(result.IsCode());
const Code& code = Code::Cast(result);
thread->SetFfiCallbackCode(callback_id, code);
return code.EntryPoint();
}
#endif
// Static invocations to this method are translated directly in streaming FGB
// and bytecode FGB. However, we can still reach this entrypoint in the bytecode
// interpreter.
DEFINE_NATIVE_ENTRY(Ffi_asFunctionInternal, 2, 1) {
#if defined(DART_PRECOMPILED_RUNTIME) || defined(DART_PRECOMPILER)
UNREACHABLE();
#else
ASSERT(FLAG_enable_interpreter);
GET_NON_NULL_NATIVE_ARGUMENT(Pointer, pointer, arguments->NativeArgAt(0));
GET_NATIVE_TYPE_ARGUMENT(dart_type, arguments->NativeTypeArgAt(0));
GET_NATIVE_TYPE_ARGUMENT(native_type, arguments->NativeTypeArgAt(1));
const Function& dart_signature =
Function::Handle(zone, Type::Cast(dart_type).signature());
const Function& native_signature =
Function::Handle(zone, Type::Cast(native_type).signature());
const Function& function = Function::Handle(
compiler::ffi::TrampolineFunction(dart_signature, native_signature));
// Set the c function pointer in the context of the closure rather than in
// the function so that we can reuse the function for each c function with
// the same signature.
const Context& context = Context::Handle(Context::New(1));
context.SetAt(0,
Integer::Handle(zone, Integer::New(pointer.NativeAddress())));
return Closure::New(Object::null_type_arguments(),
Object::null_type_arguments(), function, context,
Heap::kOld);
#endif
}
DEFINE_NATIVE_ENTRY(Ffi_fromFunction, 1, 2) {
#if defined(DART_PRECOMPILED_RUNTIME) || defined(DART_PRECOMPILER) || \
defined(TARGET_ARCH_DBC)
// https://github.com/dart-lang/sdk/issues/37295
// FFI is supported, but callbacks are not.
Exceptions::ThrowUnsupportedError(
"FFI callbacks are not yet supported in AOT or on DBC.");
#else
GET_NATIVE_TYPE_ARGUMENT(type_arg, arguments->NativeTypeArgAt(0));
GET_NON_NULL_NATIVE_ARGUMENT(Closure, closure, arguments->NativeArgAt(0));
GET_NON_NULL_NATIVE_ARGUMENT(Instance, exceptional_return,
arguments->NativeArgAt(1));
if (!type_arg.IsInstantiated() || !type_arg.IsFunctionType()) {
// TODO(35902): Remove this when dynamic invocations of fromFunction are
// prohibited.
Exceptions::ThrowUnsupportedError(
"Type argument to fromFunction must an instantiated function type.");
}
const Function& native_signature =
Function::Handle(Type::Cast(type_arg).signature());
Function& func = Function::Handle(closure.function());
TypeArguments& type_args = TypeArguments::Handle(zone);
type_args = TypeArguments::New(1);
type_args.SetTypeAt(Pointer::kNativeTypeArgPos, type_arg);
type_args = type_args.Canonicalize();
Class& native_function_class =
Class::Handle(isolate->class_table()->At(kFfiNativeFunctionCid));
native_function_class.EnsureIsFinalized(Thread::Current());
Type& native_function_type = Type::Handle(
Type::New(native_function_class, type_args, TokenPosition::kNoSource));
native_function_type ^=
ClassFinalizer::FinalizeType(Class::Handle(), native_function_type);
native_function_type ^= native_function_type.Canonicalize();
// The FE verifies that the target of a 'fromFunction' is a static method, so
// the value we see here must be a static tearoff. See ffi_use_sites.dart for
// details.
//
// TODO(36748): Define hot-reload semantics of native callbacks. We may need
// to look up the target by name.
ASSERT(func.IsImplicitClosureFunction());
func = func.parent_function();
ASSERT(func.is_static());
const AbstractType& return_type =
AbstractType::Handle(native_signature.result_type());
if (compiler::ffi::NativeTypeIsVoid(return_type)) {
if (!exceptional_return.IsNull()) {
const String& error = String::Handle(
String::NewFormatted("Exceptional return argument to 'fromFunction' "
"must be null for functions returning void."));
Exceptions::ThrowArgumentError(error);
}
} else if (!compiler::ffi::NativeTypeIsPointer(return_type) &&
exceptional_return.IsNull()) {
const String& error = String::Handle(String::NewFormatted(
"Exceptional return argument to 'fromFunction' must not be null."));
Exceptions::ThrowArgumentError(error);
}
return Pointer::New(
native_function_type,
CompileNativeCallback(native_signature, func, exceptional_return));
#endif
}
#if defined(TARGET_ARCH_DBC)
void FfiMarshalledArguments::SetFunctionAddress(uint64_t value) const {
data_[kOffsetFunctionAddress] = value;
}
static intptr_t ArgumentHostRegisterIndex(host::Register reg) {
for (intptr_t i = 0; i < host::CallingConventions::kNumArgRegs; i++) {
if (host::CallingConventions::ArgumentRegisters[i] == reg) {
return i;
}
}
UNREACHABLE();
}
void FfiMarshalledArguments::SetRegister(host::Register reg,
uint64_t value) const {
const intptr_t reg_index = ArgumentHostRegisterIndex(reg);
ASSERT(host::CallingConventions::ArgumentRegisters[reg_index] == reg);
const intptr_t index = kOffsetRegisters + reg_index;
data_[index] = value;
}
void FfiMarshalledArguments::SetFpuRegister(host::FpuRegister reg,
uint64_t value) const {
const intptr_t fpu_index = static_cast<intptr_t>(reg);
ASSERT(host::CallingConventions::FpuArgumentRegisters[fpu_index] == reg);
const intptr_t index = kOffsetFpuRegisters + fpu_index;
data_[index] = value;
}
void FfiMarshalledArguments::SetNumStackSlots(intptr_t num_args) const {
data_[kOffsetNumStackSlots] = num_args;
}
void FfiMarshalledArguments::SetAlignmentMask(uint64_t alignment_mask) const {
data_[kOffsetAlignmentMask] = alignment_mask;
}
intptr_t FfiMarshalledArguments::GetNumStackSlots() const {
return data_[kOffsetNumStackSlots];
}
void FfiMarshalledArguments::SetStackSlotValue(intptr_t index,
uint64_t value) const {
ASSERT(0 <= index && index < GetNumStackSlots());
data_[kOffsetStackSlotValues + index] = value;
}
uint64_t* FfiMarshalledArguments::New(
const compiler::ffi::FfiSignatureDescriptor& signature,
const uint64_t* arg_values) {
const intptr_t num_stack_slots = signature.num_stack_slots();
const uint64_t alignment_mask = ~(OS::ActivationFrameAlignment() - 1);
const intptr_t size =
FfiMarshalledArguments::kOffsetStackSlotValues + num_stack_slots;
uint64_t* data = Thread::Current()->GetFfiMarshalledArguments(size);
const auto& descr = FfiMarshalledArguments(data);
descr.SetFunctionAddress(arg_values[compiler::ffi::kFunctionAddressRegister]);
const intptr_t num_args = signature.length();
descr.SetNumStackSlots(num_stack_slots);
descr.SetAlignmentMask(alignment_mask);
for (int i = 0; i < num_args; i++) {
uint64_t arg_value = arg_values[compiler::ffi::kFirstArgumentRegister + i];
HostLocation loc = signature.LocationAt(i);
// TODO(36809): For 32 bit, support pair locations.
if (loc.IsRegister()) {
descr.SetRegister(loc.reg(), arg_value);
} else if (loc.IsFpuRegister()) {
descr.SetFpuRegister(loc.fpu_reg(), arg_value);
} else {
ASSERT(loc.IsStackSlot() || loc.IsDoubleStackSlot());
ASSERT(loc.stack_index() < num_stack_slots);
descr.SetStackSlotValue(loc.stack_index(), arg_value);
}
}
return data;
}
#if defined(DEBUG)
void FfiMarshalledArguments::Print() const {
OS::PrintErr("FfiMarshalledArguments data_ 0x%" Pp "\n",
reinterpret_cast<intptr_t>(data_));
OS::PrintErr(" 00 0x%016" Px64 " (function address, int result)\n",
data_[0]);
for (intptr_t i = 0; i < host::CallingConventions::kNumArgRegs; i++) {
const intptr_t index = kOffsetRegisters + i;
const char* result_str = i == 0 ? ", float result" : "";
OS::PrintErr(" %02" Pd " 0x%016" Px64 " (%s%s)\n", index, data_[index],
RegisterNames::RegisterName(
host::CallingConventions::ArgumentRegisters[i]),
result_str);
}
for (intptr_t i = 0; i < host::CallingConventions::kNumFpuArgRegs; i++) {
const intptr_t index = kOffsetFpuRegisters + i;
OS::PrintErr(" %02" Pd " 0x%016" Px64 " (%s)\n", index, data_[index],
RegisterNames::FpuRegisterName(
host::CallingConventions::FpuArgumentRegisters[i]));
}
const intptr_t alignment_mask = data_[kOffsetAlignmentMask];
OS::PrintErr(" %02" Pd " 0x%" Pp " (stack alignment mask)\n",
kOffsetAlignmentMask, alignment_mask);
const intptr_t num_stack_slots = data_[kOffsetNumStackSlots];
OS::PrintErr(" %02" Pd " 0x%" Pp " (number of stack slots)\n",
kOffsetNumStackSlots, num_stack_slots);
for (intptr_t i = 0; i < num_stack_slots; i++) {
const intptr_t index = kOffsetStackSlotValues + i;
OS::PrintErr(" %02" Pd " 0x%016" Px64 " (stack slot %" Pd ")\n", index,
data_[index], i);
}
}
#endif // defined(DEBUG)
#endif // defined(TARGET_ARCH_DBC)
} // namespace dart
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