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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/dex_instruction.h"
#include "interpreter/interpreter_common.h"
#include "interpreter/shadow_frame-inl.h"
#include "jvalue-inl.h"
#include "mirror/class.h"
#include "mirror/method_type-inl.h"
#include "mirror/object.h"
#include "reflection.h"
#include "stack.h"
namespace art {
// A convenience class that allows for iteration through a list of
// input argument registers. This is used to iterate over input
// arguments while performing standard argument conversions.
class ShadowFrameGetter {
public:
ShadowFrameGetter(const ShadowFrame& shadow_frame,
const InstructionOperands* const operands,
size_t operand_index = 0u)
: shadow_frame_(shadow_frame), operands_(operands), operand_index_(operand_index) {}
ALWAYS_INLINE uint32_t Get() REQUIRES_SHARED(Locks::mutator_lock_) {
return shadow_frame_.GetVReg(Next());
}
ALWAYS_INLINE int64_t GetLong() REQUIRES_SHARED(Locks::mutator_lock_) {
return shadow_frame_.GetVRegLong(NextLong());
}
ALWAYS_INLINE ObjPtr<mirror::Object> GetReference() REQUIRES_SHARED(Locks::mutator_lock_) {
return shadow_frame_.GetVRegReference(Next());
}
private:
uint32_t Next() {
const uint32_t next = operands_->GetOperand(operand_index_);
operand_index_ += 1;
return next;
}
uint32_t NextLong() {
const uint32_t next = operands_->GetOperand(operand_index_);
operand_index_ += 2;
return next;
}
const ShadowFrame& shadow_frame_;
const InstructionOperands* const operands_; // the set of register operands to read
size_t operand_index_; // the next register operand to read from frame
};
// A convenience class that allows values to be written to a given shadow frame,
// starting at location |first_dst_reg|.
class ShadowFrameSetter {
public:
ShadowFrameSetter(ShadowFrame* shadow_frame, size_t first_dst_reg)
: shadow_frame_(shadow_frame), arg_index_(first_dst_reg) {}
ALWAYS_INLINE void Set(uint32_t value) REQUIRES_SHARED(Locks::mutator_lock_) {
DCHECK_LT(arg_index_, shadow_frame_->NumberOfVRegs());
shadow_frame_->SetVReg(arg_index_++, value);
}
ALWAYS_INLINE void SetReference(ObjPtr<mirror::Object> value)
REQUIRES_SHARED(Locks::mutator_lock_) {
DCHECK_LT(arg_index_, shadow_frame_->NumberOfVRegs());
shadow_frame_->SetVRegReference(arg_index_++, value);
}
ALWAYS_INLINE void SetLong(int64_t value) REQUIRES_SHARED(Locks::mutator_lock_) {
DCHECK_LT(arg_index_, shadow_frame_->NumberOfVRegs());
shadow_frame_->SetVRegLong(arg_index_, value);
arg_index_ += 2;
}
ALWAYS_INLINE bool Done() const {
return arg_index_ == shadow_frame_->NumberOfVRegs();
}
private:
ShadowFrame* shadow_frame_;
size_t arg_index_;
};
inline bool ConvertArgumentValue(Handle<mirror::MethodType> callsite_type,
Handle<mirror::MethodType> callee_type,
ObjPtr<mirror::Class> from_class,
ObjPtr<mirror::Class> to_class,
JValue* value) REQUIRES_SHARED(Locks::mutator_lock_) {
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 ConvertArgumentValue(Handle<mirror::MethodType> callsite_type,
Handle<mirror::MethodType> callee_type,
int index,
JValue* value) REQUIRES_SHARED(Locks::mutator_lock_) {
return ConvertArgumentValue(callsite_type,
callee_type,
callsite_type->GetPTypes()->GetWithoutChecks(index),
callee_type->GetPTypes()->GetWithoutChecks(index),
value);
}
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 start_index,
int32_t end_index) 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 = start_index; i < end_index; ++i) {
ObjPtr<mirror::Class> from(from_types->GetWithoutChecks(i));
ObjPtr<mirror::Class> to(to_types->GetWithoutChecks(i - start_index));
const Primitive::Type from_type = from->GetPrimitiveType();
const Primitive::Type to_type = to->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, from, to, &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 <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_) {
return PerformConversions(self, callsite_type, callee_type, getter, setter, 0, num_conversions);
}
template <typename G, typename S>
bool PerformConversions(Thread* self,
Handle<mirror::MethodType> callsite_type,
Handle<mirror::MethodType> callee_type,
G* getter,
S* setter)
REQUIRES_SHARED(Locks::mutator_lock_) {
int32_t num_conversions = callee_type->GetPTypes()->GetLength();
return PerformConversions(self, callsite_type, callee_type, getter, setter, 0, num_conversions);
}
} // namespace art
#endif // ART_RUNTIME_METHOD_HANDLES_INL_H_
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