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/*
* Copyright (C) 2012 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_INVOKE_ARG_ARRAY_BUILDER_H_
#define ART_RUNTIME_INVOKE_ARG_ARRAY_BUILDER_H_
#include "mirror/art_method.h"
#include "mirror/object.h"
#include "scoped_thread_state_change.h"
namespace art {
static inline size_t NumArgArrayBytes(const char* shorty, uint32_t shorty_len) {
size_t num_bytes = 0;
for (size_t i = 1; i < shorty_len; ++i) {
char ch = shorty[i];
if (ch == 'D' || ch == 'J') {
num_bytes += 8;
} else if (ch == 'L') {
// Argument is a reference or an array. The shorty descriptor
// does not distinguish between these types.
num_bytes += sizeof(mirror::Object*);
} else {
num_bytes += 4;
}
}
return num_bytes;
}
class ArgArray {
public:
explicit ArgArray(const char* shorty, uint32_t shorty_len)
: shorty_(shorty), shorty_len_(shorty_len), num_bytes_(0) {
size_t num_slots = shorty_len + 1; // +1 in case of receiver.
if (LIKELY((num_slots * 2) < kSmallArgArraySize)) {
// We can trivially use the small arg array.
arg_array_ = small_arg_array_;
} else {
// Analyze shorty to see if we need the large arg array.
for (size_t i = 1; i < shorty_len; ++i) {
char c = shorty[i];
if (c == 'J' || c == 'D') {
num_slots++;
}
}
if (num_slots <= kSmallArgArraySize) {
arg_array_ = small_arg_array_;
} else {
large_arg_array_.reset(new uint32_t[num_slots]);
arg_array_ = large_arg_array_.get();
}
}
}
uint32_t* GetArray() {
return arg_array_;
}
uint32_t GetNumBytes() {
return num_bytes_;
}
void Append(uint32_t value) {
arg_array_[num_bytes_ / 4] = value;
num_bytes_ += 4;
}
void AppendWide(uint64_t value) {
// For ARM and MIPS portable, align wide values to 8 bytes (ArgArray starts at offset of 4).
#if defined(ART_USE_PORTABLE_COMPILER) && (defined(__arm__) || defined(__mips__))
if (num_bytes_ % 8 == 0) {
num_bytes_ += 4;
}
#endif
arg_array_[num_bytes_ / 4] = value;
arg_array_[(num_bytes_ / 4) + 1] = value >> 32;
num_bytes_ += 8;
}
void BuildArgArray(const ScopedObjectAccess& soa, mirror::Object* receiver, va_list ap)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
// Set receiver if non-null (method is not static)
if (receiver != NULL) {
Append(reinterpret_cast<int32_t>(receiver));
}
for (size_t i = 1; i < shorty_len_; ++i) {
switch (shorty_[i]) {
case 'Z':
case 'B':
case 'C':
case 'S':
case 'I':
Append(va_arg(ap, jint));
break;
case 'F': {
JValue value;
value.SetF(va_arg(ap, jdouble));
Append(value.GetI());
break;
}
case 'L':
Append(reinterpret_cast<int32_t>(soa.Decode<mirror::Object*>(va_arg(ap, jobject))));
break;
case 'D': {
JValue value;
value.SetD(va_arg(ap, jdouble));
AppendWide(value.GetJ());
break;
}
case 'J': {
AppendWide(va_arg(ap, jlong));
break;
}
}
}
}
void BuildArgArray(const ScopedObjectAccess& soa, mirror::Object* receiver, jvalue* args)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
// Set receiver if non-null (method is not static)
if (receiver != NULL) {
Append(reinterpret_cast<int32_t>(receiver));
}
for (size_t i = 1, args_offset = 0; i < shorty_len_; ++i, ++args_offset) {
switch (shorty_[i]) {
case 'Z':
Append(args[args_offset].z);
break;
case 'B':
Append(args[args_offset].b);
break;
case 'C':
Append(args[args_offset].c);
break;
case 'S':
Append(args[args_offset].s);
break;
case 'I':
case 'F':
Append(args[args_offset].i);
break;
case 'L':
Append(reinterpret_cast<int32_t>(soa.Decode<mirror::Object*>(args[args_offset].l)));
break;
case 'D':
case 'J':
AppendWide(args[args_offset].j);
break;
}
}
}
void BuildArgArrayFromFrame(ShadowFrame* shadow_frame, uint32_t arg_offset)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
// Set receiver if non-null (method is not static)
size_t cur_arg = arg_offset;
if (!shadow_frame->GetMethod()->IsStatic()) {
Append(shadow_frame->GetVReg(cur_arg));
cur_arg++;
}
for (size_t i = 1; i < shorty_len_; ++i) {
switch (shorty_[i]) {
case 'Z':
case 'B':
case 'C':
case 'S':
case 'I':
case 'F':
case 'L':
Append(shadow_frame->GetVReg(cur_arg));
cur_arg++;
break;
case 'D':
case 'J':
AppendWide(shadow_frame->GetVRegLong(cur_arg));
cur_arg++;
cur_arg++;
break;
}
}
}
private:
enum { kSmallArgArraySize = 16 };
const char* const shorty_;
const uint32_t shorty_len_;
uint32_t num_bytes_;
uint32_t* arg_array_;
uint32_t small_arg_array_[kSmallArgArraySize];
UniquePtr<uint32_t[]> large_arg_array_;
};
} // namespace art
#endif // ART_RUNTIME_INVOKE_ARG_ARRAY_BUILDER_H_