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/*
* Copyright (C) 2011 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_MIRROR_STRING_INL_H_
#define ART_RUNTIME_MIRROR_STRING_INL_H_
#include "array.h"
#include "class.h"
#include "gc/heap-inl.h"
#include "intern_table.h"
#include "runtime.h"
#include "string.h"
#include "thread.h"
#include "utf.h"
#include "utils.h"
namespace art {
namespace mirror {
inline uint32_t String::ClassSize() {
uint32_t vtable_entries = Object::kVTableLength + 52;
return Class::ComputeClassSize(true, vtable_entries, 0, 1, 0, 1, 2);
}
// Sets string count in the allocation code path to ensure it is guarded by a CAS.
class SetStringCountVisitor {
public:
explicit SetStringCountVisitor(int32_t count) : count_(count) {
}
void operator()(Object* obj, size_t usable_size ATTRIBUTE_UNUSED) const
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
// Avoid AsString as object is not yet in live bitmap or allocation stack.
String* string = down_cast<String*>(obj);
string->SetCount(count_);
}
private:
const int32_t count_;
};
// Sets string count and value in the allocation code path to ensure it is guarded by a CAS.
class SetStringCountAndBytesVisitor {
public:
SetStringCountAndBytesVisitor(int32_t count, Handle<ByteArray> src_array, int32_t offset,
int32_t high_byte)
: count_(count), src_array_(src_array), offset_(offset), high_byte_(high_byte) {
}
void operator()(Object* obj, size_t usable_size ATTRIBUTE_UNUSED) const
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
// Avoid AsString as object is not yet in live bitmap or allocation stack.
String* string = down_cast<String*>(obj);
string->SetCount(count_);
uint16_t* value = string->GetValue();
const uint8_t* const src = reinterpret_cast<uint8_t*>(src_array_->GetData()) + offset_;
for (int i = 0; i < count_; i++) {
value[i] = high_byte_ + (src[i] & 0xFF);
}
}
private:
const int32_t count_;
Handle<ByteArray> src_array_;
const int32_t offset_;
const int32_t high_byte_;
};
// Sets string count and value in the allocation code path to ensure it is guarded by a CAS.
class SetStringCountAndValueVisitorFromCharArray {
public:
SetStringCountAndValueVisitorFromCharArray(int32_t count, Handle<CharArray> src_array,
int32_t offset) :
count_(count), src_array_(src_array), offset_(offset) {
}
void operator()(Object* obj, size_t usable_size ATTRIBUTE_UNUSED) const
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
// Avoid AsString as object is not yet in live bitmap or allocation stack.
String* string = down_cast<String*>(obj);
string->SetCount(count_);
const uint16_t* const src = src_array_->GetData() + offset_;
memcpy(string->GetValue(), src, count_ * sizeof(uint16_t));
}
private:
const int32_t count_;
Handle<CharArray> src_array_;
const int32_t offset_;
};
// Sets string count and value in the allocation code path to ensure it is guarded by a CAS.
class SetStringCountAndValueVisitorFromString {
public:
SetStringCountAndValueVisitorFromString(int32_t count, Handle<String> src_string,
int32_t offset) :
count_(count), src_string_(src_string), offset_(offset) {
}
void operator()(Object* obj, size_t usable_size ATTRIBUTE_UNUSED) const
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
// Avoid AsString as object is not yet in live bitmap or allocation stack.
String* string = down_cast<String*>(obj);
string->SetCount(count_);
const uint16_t* const src = src_string_->GetValue() + offset_;
memcpy(string->GetValue(), src, count_ * sizeof(uint16_t));
}
private:
const int32_t count_;
Handle<String> src_string_;
const int32_t offset_;
};
inline String* String::Intern() {
return Runtime::Current()->GetInternTable()->InternWeak(this);
}
inline uint16_t String::CharAt(int32_t index) {
int32_t count = GetField32(OFFSET_OF_OBJECT_MEMBER(String, count_));
if (UNLIKELY((index < 0) || (index >= count))) {
Thread* self = Thread::Current();
self->ThrowNewExceptionF("Ljava/lang/StringIndexOutOfBoundsException;",
"length=%i; index=%i", count, index);
return 0;
}
return GetValue()[index];
}
template<VerifyObjectFlags kVerifyFlags>
inline size_t String::SizeOf() {
return sizeof(String) + (sizeof(uint16_t) * GetLength<kVerifyFlags>());
}
template <bool kIsInstrumented, typename PreFenceVisitor>
inline String* String::Alloc(Thread* self, int32_t utf16_length, gc::AllocatorType allocator_type,
const PreFenceVisitor& pre_fence_visitor) {
size_t header_size = sizeof(String);
size_t data_size = sizeof(uint16_t) * utf16_length;
size_t size = header_size + data_size;
Class* string_class = GetJavaLangString();
// Check for overflow and throw OutOfMemoryError if this was an unreasonable request.
if (UNLIKELY(size < data_size)) {
self->ThrowOutOfMemoryError(StringPrintf("%s of length %d would overflow",
PrettyDescriptor(string_class).c_str(),
utf16_length).c_str());
return nullptr;
}
gc::Heap* heap = Runtime::Current()->GetHeap();
return down_cast<String*>(
heap->AllocObjectWithAllocator<kIsInstrumented, false>(self, string_class, size,
allocator_type, pre_fence_visitor));
}
template <bool kIsInstrumented>
inline String* String::AllocFromByteArray(Thread* self, int32_t byte_length,
Handle<ByteArray> array, int32_t offset,
int32_t high_byte, gc::AllocatorType allocator_type) {
SetStringCountAndBytesVisitor visitor(byte_length, array, offset, high_byte << 8);
String* string = Alloc<kIsInstrumented>(self, byte_length, allocator_type, visitor);
return string;
}
template <bool kIsInstrumented>
inline String* String::AllocFromCharArray(Thread* self, int32_t array_length,
Handle<CharArray> array, int32_t offset,
gc::AllocatorType allocator_type) {
SetStringCountAndValueVisitorFromCharArray visitor(array_length, array, offset);
String* new_string = Alloc<kIsInstrumented>(self, array_length, allocator_type, visitor);
return new_string;
}
template <bool kIsInstrumented>
inline String* String::AllocFromString(Thread* self, int32_t string_length, Handle<String> string,
int32_t offset, gc::AllocatorType allocator_type) {
SetStringCountAndValueVisitorFromString visitor(string_length, string, offset);
String* new_string = Alloc<kIsInstrumented>(self, string_length, allocator_type, visitor);
return new_string;
}
inline int32_t String::GetHashCode() {
int32_t result = GetField32(OFFSET_OF_OBJECT_MEMBER(String, hash_code_));
if (UNLIKELY(result == 0)) {
result = ComputeHashCode();
}
DCHECK(result != 0 || ComputeUtf16Hash(GetValue(), GetLength()) == 0)
<< ToModifiedUtf8() << " " << result;
return result;
}
} // namespace mirror
} // namespace art
#endif // ART_RUNTIME_MIRROR_STRING_INL_H_
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