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/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef ART_RUNTIME_METHOD_HANDLES_INL_H_
#define ART_RUNTIME_METHOD_HANDLES_INL_H_
#include "method_handles.h"
#include "common_throws.h"
#include "dex_instruction.h"
#include "interpreter/interpreter_common.h"
#include "jvalue.h"
#include "mirror/class.h"
#include "mirror/method_type.h"
#include "mirror/object.h"
#include "reflection.h"
#include "stack.h"
namespace art {
inline bool ConvertArgumentValue(Handle<mirror::MethodType> callsite_type,
Handle<mirror::MethodType> callee_type,
int index,
JValue* value) REQUIRES_SHARED(Locks::mutator_lock_) {
ObjPtr<mirror::Class> from_class(callsite_type->GetPTypes()->GetWithoutChecks(index));
ObjPtr<mirror::Class> to_class(callee_type->GetPTypes()->GetWithoutChecks(index));
if (from_class == to_class) {
return true;
}
// |value| may contain a bare heap pointer which is generally
// |unsafe. ConvertJValueCommon() saves |value|, |from_class|, and
// |to_class| to Handles where necessary to avoid issues if the heap
// changes.
if (ConvertJValueCommon(callsite_type, callee_type, from_class, to_class, value)) {
DCHECK(!Thread::Current()->IsExceptionPending());
return true;
} else {
DCHECK(Thread::Current()->IsExceptionPending());
value->SetJ(0);
return false;
}
}
inline bool ConvertReturnValue(Handle<mirror::MethodType> callsite_type,
Handle<mirror::MethodType> callee_type,
JValue* value) REQUIRES_SHARED(Locks::mutator_lock_) {
ObjPtr<mirror::Class> from_class(callee_type->GetRType());
ObjPtr<mirror::Class> to_class(callsite_type->GetRType());
if (to_class->GetPrimitiveType() == Primitive::kPrimVoid || from_class == to_class) {
return true;
}
// |value| may contain a bare heap pointer which is generally
// unsafe. ConvertJValueCommon() saves |value|, |from_class|, and
// |to_class| to Handles where necessary to avoid issues if the heap
// changes.
if (ConvertJValueCommon(callsite_type, callee_type, from_class, to_class, value)) {
DCHECK(!Thread::Current()->IsExceptionPending());
return true;
} else {
DCHECK(Thread::Current()->IsExceptionPending());
value->SetJ(0);
return false;
}
}
template <typename G, typename S>
bool PerformConversions(Thread* self,
Handle<mirror::MethodType> callsite_type,
Handle<mirror::MethodType> callee_type,
G* getter,
S* setter,
int32_t num_conversions) REQUIRES_SHARED(Locks::mutator_lock_) {
StackHandleScope<2> hs(self);
Handle<mirror::ObjectArray<mirror::Class>> from_types(hs.NewHandle(callsite_type->GetPTypes()));
Handle<mirror::ObjectArray<mirror::Class>> to_types(hs.NewHandle(callee_type->GetPTypes()));
for (int32_t i = 0; i < num_conversions; ++i) {
ObjPtr<mirror::Class> from(from_types->GetWithoutChecks(i));
ObjPtr<mirror::Class> to(to_types->GetWithoutChecks(i));
const Primitive::Type from_type = from_types->GetWithoutChecks(i)->GetPrimitiveType();
const Primitive::Type to_type = to_types->GetWithoutChecks(i)->GetPrimitiveType();
if (from == to) {
// Easy case - the types are identical. Nothing left to do except to pass
// the arguments along verbatim.
if (Primitive::Is64BitType(from_type)) {
setter->SetLong(getter->GetLong());
} else if (from_type == Primitive::kPrimNot) {
setter->SetReference(getter->GetReference());
} else {
setter->Set(getter->Get());
}
} else {
JValue value;
if (Primitive::Is64BitType(from_type)) {
value.SetJ(getter->GetLong());
} else if (from_type == Primitive::kPrimNot) {
value.SetL(getter->GetReference());
} else {
value.SetI(getter->Get());
}
// Caveat emptor - ObjPtr's not guaranteed valid after this call.
if (!ConvertArgumentValue(callsite_type, callee_type, i, &value)) {
DCHECK(self->IsExceptionPending());
return false;
}
if (Primitive::Is64BitType(to_type)) {
setter->SetLong(value.GetJ());
} else if (to_type == Primitive::kPrimNot) {
setter->SetReference(value.GetL());
} else {
setter->Set(value.GetI());
}
}
}
return true;
}
template <bool is_range>
bool ConvertAndCopyArgumentsFromCallerFrame(Thread* self,
Handle<mirror::MethodType> callsite_type,
Handle<mirror::MethodType> callee_type,
const ShadowFrame& caller_frame,
uint32_t first_src_reg,
uint32_t first_dest_reg,
const uint32_t (&arg)[Instruction::kMaxVarArgRegs],
ShadowFrame* callee_frame)
REQUIRES_SHARED(Locks::mutator_lock_) {
ObjPtr<mirror::ObjectArray<mirror::Class>> from_types(callsite_type->GetPTypes());
ObjPtr<mirror::ObjectArray<mirror::Class>> to_types(callee_type->GetPTypes());
const int32_t num_method_params = from_types->GetLength();
if (to_types->GetLength() != num_method_params) {
ThrowWrongMethodTypeException(callee_type.Get(), callsite_type.Get());
return false;
}
ShadowFrameGetter<is_range> getter(first_src_reg, arg, caller_frame);
ShadowFrameSetter setter(callee_frame, first_dest_reg);
return PerformConversions<ShadowFrameGetter<is_range>, ShadowFrameSetter>(self,
callsite_type,
callee_type,
&getter,
&setter,
num_method_params);
}
} // namespace art
#endif // ART_RUNTIME_METHOD_HANDLES_INL_H_
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