231 lines
9 KiB
C++
231 lines
9 KiB
C++
/*
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* Copyright (C) 2011 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ART_RUNTIME_MIRROR_STRING_INL_H_
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#define ART_RUNTIME_MIRROR_STRING_INL_H_
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#include "array.h"
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#include "base/bit_utils.h"
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#include "class.h"
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#include "gc/heap-inl.h"
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#include "globals.h"
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#include "intern_table.h"
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#include "runtime.h"
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#include "string.h"
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#include "thread.h"
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#include "utf.h"
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#include "utils.h"
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namespace art {
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namespace mirror {
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inline uint32_t String::ClassSize(size_t pointer_size) {
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uint32_t vtable_entries = Object::kVTableLength + 56;
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return Class::ComputeClassSize(true, vtable_entries, 0, 0, 0, 1, 2, pointer_size);
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}
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// Sets string count in the allocation code path to ensure it is guarded by a CAS.
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class SetStringCountVisitor {
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public:
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explicit SetStringCountVisitor(int32_t count) : count_(count) {
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}
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void operator()(Object* obj, size_t usable_size ATTRIBUTE_UNUSED) const
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SHARED_REQUIRES(Locks::mutator_lock_) {
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// Avoid AsString as object is not yet in live bitmap or allocation stack.
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String* string = down_cast<String*>(obj);
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string->SetCount(count_);
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}
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private:
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const int32_t count_;
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};
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// Sets string count and value in the allocation code path to ensure it is guarded by a CAS.
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class SetStringCountAndBytesVisitor {
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public:
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SetStringCountAndBytesVisitor(int32_t count, Handle<ByteArray> src_array, int32_t offset,
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int32_t high_byte)
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: count_(count), src_array_(src_array), offset_(offset), high_byte_(high_byte) {
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}
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void operator()(Object* obj, size_t usable_size ATTRIBUTE_UNUSED) const
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SHARED_REQUIRES(Locks::mutator_lock_) {
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// Avoid AsString as object is not yet in live bitmap or allocation stack.
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String* string = down_cast<String*>(obj);
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string->SetCount(count_);
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uint16_t* value = string->GetValue();
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const uint8_t* const src = reinterpret_cast<uint8_t*>(src_array_->GetData()) + offset_;
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for (int i = 0; i < count_; i++) {
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value[i] = high_byte_ + (src[i] & 0xFF);
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}
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}
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private:
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const int32_t count_;
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Handle<ByteArray> src_array_;
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const int32_t offset_;
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const int32_t high_byte_;
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};
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// Sets string count and value in the allocation code path to ensure it is guarded by a CAS.
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class SetStringCountAndValueVisitorFromCharArray {
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public:
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SetStringCountAndValueVisitorFromCharArray(int32_t count, Handle<CharArray> src_array,
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int32_t offset) :
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count_(count), src_array_(src_array), offset_(offset) {
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}
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void operator()(Object* obj, size_t usable_size ATTRIBUTE_UNUSED) const
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SHARED_REQUIRES(Locks::mutator_lock_) {
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// Avoid AsString as object is not yet in live bitmap or allocation stack.
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String* string = down_cast<String*>(obj);
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string->SetCount(count_);
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const uint16_t* const src = src_array_->GetData() + offset_;
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memcpy(string->GetValue(), src, count_ * sizeof(uint16_t));
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}
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private:
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const int32_t count_;
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Handle<CharArray> src_array_;
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const int32_t offset_;
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};
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// Sets string count and value in the allocation code path to ensure it is guarded by a CAS.
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class SetStringCountAndValueVisitorFromString {
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public:
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SetStringCountAndValueVisitorFromString(int32_t count, Handle<String> src_string,
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int32_t offset) :
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count_(count), src_string_(src_string), offset_(offset) {
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}
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void operator()(Object* obj, size_t usable_size ATTRIBUTE_UNUSED) const
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SHARED_REQUIRES(Locks::mutator_lock_) {
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// Avoid AsString as object is not yet in live bitmap or allocation stack.
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String* string = down_cast<String*>(obj);
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string->SetCount(count_);
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const uint16_t* const src = src_string_->GetValue() + offset_;
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memcpy(string->GetValue(), src, count_ * sizeof(uint16_t));
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}
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private:
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const int32_t count_;
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Handle<String> src_string_;
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const int32_t offset_;
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};
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inline String* String::Intern() {
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return Runtime::Current()->GetInternTable()->InternWeak(this);
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}
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inline uint16_t String::CharAt(int32_t index) {
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int32_t count = GetField32(OFFSET_OF_OBJECT_MEMBER(String, count_));
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if (UNLIKELY((index < 0) || (index >= count))) {
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Thread* self = Thread::Current();
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self->ThrowNewExceptionF("Ljava/lang/StringIndexOutOfBoundsException;",
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"length=%i; index=%i", count, index);
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return 0;
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}
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return GetValue()[index];
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}
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template<VerifyObjectFlags kVerifyFlags>
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inline size_t String::SizeOf() {
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size_t size = sizeof(String) + (sizeof(uint16_t) * GetLength<kVerifyFlags>());
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// String.equals() intrinsics assume zero-padding up to kObjectAlignment,
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// so make sure the zero-padding is actually copied around if GC compaction
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// chooses to copy only SizeOf() bytes.
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// http://b/23528461
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return RoundUp(size, kObjectAlignment);
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}
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template <bool kIsInstrumented, typename PreFenceVisitor>
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inline String* String::Alloc(Thread* self, int32_t utf16_length, gc::AllocatorType allocator_type,
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const PreFenceVisitor& pre_fence_visitor) {
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constexpr size_t header_size = sizeof(String);
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static_assert(sizeof(utf16_length) <= sizeof(size_t),
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"static_cast<size_t>(utf16_length) must not lose bits.");
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size_t length = static_cast<size_t>(utf16_length);
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size_t data_size = sizeof(uint16_t) * length;
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size_t size = header_size + data_size;
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// String.equals() intrinsics assume zero-padding up to kObjectAlignment,
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// so make sure the allocator clears the padding as well.
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// http://b/23528461
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size_t alloc_size = RoundUp(size, kObjectAlignment);
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Class* string_class = GetJavaLangString();
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// Check for overflow and throw OutOfMemoryError if this was an unreasonable request.
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// Do this by comparing with the maximum length that will _not_ cause an overflow.
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constexpr size_t overflow_length = (-header_size) / sizeof(uint16_t); // Unsigned arithmetic.
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constexpr size_t max_alloc_length = overflow_length - 1u;
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static_assert(IsAligned<sizeof(uint16_t)>(kObjectAlignment),
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"kObjectAlignment must be at least as big as Java char alignment");
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constexpr size_t max_length = RoundDown(max_alloc_length, kObjectAlignment / sizeof(uint16_t));
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if (UNLIKELY(length > max_length)) {
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self->ThrowOutOfMemoryError(StringPrintf("%s of length %d would overflow",
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PrettyDescriptor(string_class).c_str(),
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utf16_length).c_str());
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return nullptr;
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}
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gc::Heap* heap = Runtime::Current()->GetHeap();
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return down_cast<String*>(
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heap->AllocObjectWithAllocator<kIsInstrumented, true>(self, string_class, alloc_size,
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allocator_type, pre_fence_visitor));
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}
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template <bool kIsInstrumented>
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inline String* String::AllocFromByteArray(Thread* self, int32_t byte_length,
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Handle<ByteArray> array, int32_t offset,
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int32_t high_byte, gc::AllocatorType allocator_type) {
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SetStringCountAndBytesVisitor visitor(byte_length, array, offset, high_byte << 8);
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String* string = Alloc<kIsInstrumented>(self, byte_length, allocator_type, visitor);
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return string;
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}
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template <bool kIsInstrumented>
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inline String* String::AllocFromCharArray(Thread* self, int32_t count,
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Handle<CharArray> array, int32_t offset,
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gc::AllocatorType allocator_type) {
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// It is a caller error to have a count less than the actual array's size.
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DCHECK_GE(array->GetLength(), count);
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SetStringCountAndValueVisitorFromCharArray visitor(count, array, offset);
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String* new_string = Alloc<kIsInstrumented>(self, count, allocator_type, visitor);
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return new_string;
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}
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template <bool kIsInstrumented>
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inline String* String::AllocFromString(Thread* self, int32_t string_length, Handle<String> string,
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int32_t offset, gc::AllocatorType allocator_type) {
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SetStringCountAndValueVisitorFromString visitor(string_length, string, offset);
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String* new_string = Alloc<kIsInstrumented>(self, string_length, allocator_type, visitor);
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return new_string;
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}
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inline int32_t String::GetHashCode() {
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int32_t result = GetField32(OFFSET_OF_OBJECT_MEMBER(String, hash_code_));
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if (UNLIKELY(result == 0)) {
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result = ComputeHashCode();
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}
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DCHECK(result != 0 || ComputeUtf16Hash(GetValue(), GetLength()) == 0)
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<< ToModifiedUtf8() << " " << result;
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return result;
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}
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} // namespace mirror
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} // namespace art
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#endif // ART_RUNTIME_MIRROR_STRING_INL_H_
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