377 lines
14 KiB
C++
377 lines
14 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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#include "string-alloc-inl.h"
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#include "arch/memcmp16.h"
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#include "array-alloc-inl.h"
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#include "base/array_ref.h"
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#include "base/stl_util.h"
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#include "class-inl.h"
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#include "dex/descriptors_names.h"
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#include "dex/utf-inl.h"
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#include "gc/accounting/card_table-inl.h"
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#include "handle_scope-inl.h"
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#include "intern_table.h"
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#include "object-inl.h"
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#include "runtime.h"
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#include "string-inl.h"
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#include "thread.h"
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namespace art {
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namespace mirror {
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int32_t String::FastIndexOf(int32_t ch, int32_t start) {
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int32_t count = GetLength();
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if (start < 0) {
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start = 0;
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} else if (start > count) {
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start = count;
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}
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if (IsCompressed()) {
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return FastIndexOf<uint8_t>(GetValueCompressed(), ch, start);
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} else {
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return FastIndexOf<uint16_t>(GetValue(), ch, start);
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}
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}
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int String::ComputeHashCode() {
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int32_t hash_code = 0;
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if (IsCompressed()) {
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hash_code = ComputeUtf16Hash(GetValueCompressed(), GetLength());
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} else {
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hash_code = ComputeUtf16Hash(GetValue(), GetLength());
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}
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SetHashCode(hash_code);
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return hash_code;
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}
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inline bool String::AllASCIIExcept(const uint16_t* chars, int32_t length, uint16_t non_ascii) {
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DCHECK(!IsASCII(non_ascii));
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for (int32_t i = 0; i < length; ++i) {
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if (!IsASCII(chars[i]) && chars[i] != non_ascii) {
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return false;
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}
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}
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return true;
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}
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ObjPtr<String> String::DoReplace(Thread* self, Handle<String> src, uint16_t old_c, uint16_t new_c) {
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int32_t length = src->GetLength();
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DCHECK(src->IsCompressed()
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? ContainsElement(ArrayRef<uint8_t>(src->value_compressed_, length), old_c)
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: ContainsElement(ArrayRef<uint16_t>(src->value_, length), old_c));
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bool compressible =
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kUseStringCompression &&
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IsASCII(new_c) &&
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(src->IsCompressed() || (!IsASCII(old_c) && AllASCIIExcept(src->value_, length, old_c)));
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gc::AllocatorType allocator_type = Runtime::Current()->GetHeap()->GetCurrentAllocator();
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const int32_t length_with_flag = String::GetFlaggedCount(length, compressible);
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auto visitor = [=](ObjPtr<Object> obj, size_t usable_size) REQUIRES_SHARED(Locks::mutator_lock_) {
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SetStringCountVisitor set_string_count_visitor(length_with_flag);
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set_string_count_visitor(obj, usable_size);
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ObjPtr<String> new_string = obj->AsString();
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if (compressible) {
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auto replace = [old_c, new_c](uint16_t c) {
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return dchecked_integral_cast<uint8_t>((old_c != c) ? c : new_c);
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};
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uint8_t* out = new_string->value_compressed_;
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if (LIKELY(src->IsCompressed())) { // LIKELY(compressible == src->IsCompressed())
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std::transform(src->value_compressed_, src->value_compressed_ + length, out, replace);
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} else {
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std::transform(src->value_, src->value_ + length, out, replace);
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}
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DCHECK(kUseStringCompression && AllASCII(out, length));
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} else {
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auto replace = [old_c, new_c](uint16_t c) {
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return (old_c != c) ? c : new_c;
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};
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uint16_t* out = new_string->value_;
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if (UNLIKELY(src->IsCompressed())) { // LIKELY(compressible == src->IsCompressed())
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std::transform(src->value_compressed_, src->value_compressed_ + length, out, replace);
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} else {
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std::transform(src->value_, src->value_ + length, out, replace);
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}
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DCHECK(!kUseStringCompression || !AllASCII(out, length));
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}
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};
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return Alloc(self, length_with_flag, allocator_type, visitor);
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}
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ObjPtr<String> String::DoConcat(Thread* self, Handle<String> h_this, Handle<String> h_arg) {
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int32_t length_this = h_this->GetLength();
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int32_t length_arg = h_arg->GetLength();
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gc::AllocatorType allocator_type = Runtime::Current()->GetHeap()->GetCurrentAllocator();
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const bool compressible =
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kUseStringCompression && (h_this->IsCompressed() && h_arg->IsCompressed());
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const int32_t length_with_flag = String::GetFlaggedCount(length_this + length_arg, compressible);
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auto visitor = [=](ObjPtr<Object> obj, size_t usable_size) REQUIRES_SHARED(Locks::mutator_lock_) {
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SetStringCountVisitor set_string_count_visitor(length_with_flag);
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set_string_count_visitor(obj, usable_size);
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ObjPtr<String> new_string = obj->AsString();
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if (compressible) {
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uint8_t* new_value = new_string->GetValueCompressed();
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memcpy(new_value, h_this->GetValueCompressed(), length_this * sizeof(uint8_t));
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memcpy(new_value + length_this, h_arg->GetValueCompressed(), length_arg * sizeof(uint8_t));
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} else {
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uint16_t* new_value = new_string->GetValue();
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if (h_this->IsCompressed()) {
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const uint8_t* value_this = h_this->GetValueCompressed();
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for (int i = 0; i < length_this; ++i) {
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new_value[i] = value_this[i];
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}
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} else {
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memcpy(new_value, h_this->GetValue(), length_this * sizeof(uint16_t));
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}
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if (h_arg->IsCompressed()) {
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const uint8_t* value_arg = h_arg->GetValueCompressed();
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for (int i = 0; i < length_arg; ++i) {
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new_value[i + length_this] = value_arg[i];
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}
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} else {
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memcpy(new_value + length_this, h_arg->GetValue(), length_arg * sizeof(uint16_t));
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}
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}
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};
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return Alloc(self, length_with_flag, allocator_type, visitor);
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}
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ObjPtr<String> String::AllocFromUtf16(Thread* self,
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int32_t utf16_length,
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const uint16_t* utf16_data_in) {
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CHECK(utf16_data_in != nullptr || utf16_length == 0);
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gc::AllocatorType allocator_type = Runtime::Current()->GetHeap()->GetCurrentAllocator();
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const bool compressible = kUseStringCompression &&
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String::AllASCII<uint16_t>(utf16_data_in, utf16_length);
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int32_t length_with_flag = String::GetFlaggedCount(utf16_length, compressible);
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auto visitor = [=](ObjPtr<Object> obj, size_t usable_size) REQUIRES_SHARED(Locks::mutator_lock_) {
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SetStringCountVisitor set_string_count_visitor(length_with_flag);
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set_string_count_visitor(obj, usable_size);
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ObjPtr<String> new_string = obj->AsString();
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if (compressible) {
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uint8_t* value = new_string->GetValueCompressed();
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for (int i = 0; i < utf16_length; ++i) {
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value[i] = static_cast<uint8_t>(utf16_data_in[i]);
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}
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} else {
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memcpy(new_string->GetValue(), utf16_data_in, utf16_length * sizeof(uint16_t));
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}
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};
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return Alloc(self, length_with_flag, allocator_type, visitor);
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}
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ObjPtr<String> String::AllocFromModifiedUtf8(Thread* self, const char* utf) {
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DCHECK(utf != nullptr);
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size_t byte_count = strlen(utf);
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size_t char_count = CountModifiedUtf8Chars(utf, byte_count);
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return AllocFromModifiedUtf8(self, char_count, utf, byte_count);
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}
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ObjPtr<String> String::AllocFromModifiedUtf8(Thread* self,
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int32_t utf16_length,
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const char* utf8_data_in) {
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return AllocFromModifiedUtf8(self, utf16_length, utf8_data_in, strlen(utf8_data_in));
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}
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ObjPtr<String> String::AllocFromModifiedUtf8(Thread* self,
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int32_t utf16_length,
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const char* utf8_data_in,
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int32_t utf8_length) {
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gc::AllocatorType allocator_type = Runtime::Current()->GetHeap()->GetCurrentAllocator();
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const bool compressible = kUseStringCompression && (utf16_length == utf8_length);
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const int32_t length_with_flag = String::GetFlaggedCount(utf16_length, compressible);
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auto visitor = [=](ObjPtr<Object> obj, size_t usable_size) REQUIRES_SHARED(Locks::mutator_lock_) {
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SetStringCountVisitor set_string_count_visitor(length_with_flag);
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set_string_count_visitor(obj, usable_size);
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ObjPtr<String> new_string = obj->AsString();
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if (compressible) {
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memcpy(new_string->GetValueCompressed(), utf8_data_in, utf16_length * sizeof(uint8_t));
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} else {
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uint16_t* utf16_data_out = new_string->GetValue();
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ConvertModifiedUtf8ToUtf16(utf16_data_out, utf16_length, utf8_data_in, utf8_length);
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}
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};
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return Alloc(self, length_with_flag, allocator_type, visitor);
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}
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bool String::Equals(ObjPtr<String> that) {
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if (this == that) {
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// Quick reference equality test
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return true;
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} else if (that == nullptr) {
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// Null isn't an instanceof anything
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return false;
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} else if (this->GetCount() != that->GetCount()) {
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// Quick length and compression inequality test
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return false;
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} else {
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// Note: don't short circuit on hash code as we're presumably here as the
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// hash code was already equal
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if (this->IsCompressed()) {
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return memcmp(this->GetValueCompressed(), that->GetValueCompressed(), this->GetLength()) == 0;
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} else {
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return memcmp(this->GetValue(), that->GetValue(), sizeof(uint16_t) * this->GetLength()) == 0;
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}
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}
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}
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bool String::Equals(const char* modified_utf8) {
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const int32_t length = GetLength();
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if (IsCompressed()) {
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return strlen(modified_utf8) == dchecked_integral_cast<uint32_t>(length) &&
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memcmp(modified_utf8, GetValueCompressed(), length) == 0;
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}
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const uint16_t* value = GetValue();
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int32_t i = 0;
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while (i < length) {
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const uint32_t ch = GetUtf16FromUtf8(&modified_utf8);
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if (ch == '\0') {
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return false;
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}
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if (GetLeadingUtf16Char(ch) != value[i++]) {
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return false;
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}
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const uint16_t trailing = GetTrailingUtf16Char(ch);
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if (trailing != 0) {
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if (i == length) {
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return false;
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}
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if (value[i++] != trailing) {
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return false;
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}
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}
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}
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return *modified_utf8 == '\0';
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}
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// Create a modified UTF-8 encoded std::string from a java/lang/String object.
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std::string String::ToModifiedUtf8() {
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if (IsCompressed()) {
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return std::string(reinterpret_cast<const char*>(GetValueCompressed()), GetLength());
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} else {
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size_t byte_count = GetUtfLength();
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std::string result(byte_count, static_cast<char>(0));
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ConvertUtf16ToModifiedUtf8(&result[0], byte_count, GetValue(), GetLength());
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return result;
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}
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}
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int32_t String::CompareTo(ObjPtr<String> rhs) {
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// Quick test for comparison of a string with itself.
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ObjPtr<String> lhs = this;
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if (lhs == rhs) {
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return 0;
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}
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int32_t lhs_count = lhs->GetLength();
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int32_t rhs_count = rhs->GetLength();
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int32_t count_diff = lhs_count - rhs_count;
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int32_t min_count = (count_diff < 0) ? lhs_count : rhs_count;
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if (lhs->IsCompressed() && rhs->IsCompressed()) {
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const uint8_t* lhs_chars = lhs->GetValueCompressed();
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const uint8_t* rhs_chars = rhs->GetValueCompressed();
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for (int32_t i = 0; i < min_count; ++i) {
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int32_t char_diff = static_cast<int32_t>(lhs_chars[i]) - static_cast<int32_t>(rhs_chars[i]);
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if (char_diff != 0) {
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return char_diff;
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}
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}
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} else if (lhs->IsCompressed() || rhs->IsCompressed()) {
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const uint8_t* compressed_chars =
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lhs->IsCompressed() ? lhs->GetValueCompressed() : rhs->GetValueCompressed();
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const uint16_t* uncompressed_chars = lhs->IsCompressed() ? rhs->GetValue() : lhs->GetValue();
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for (int32_t i = 0; i < min_count; ++i) {
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int32_t char_diff =
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static_cast<int32_t>(compressed_chars[i]) - static_cast<int32_t>(uncompressed_chars[i]);
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if (char_diff != 0) {
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return lhs->IsCompressed() ? char_diff : -char_diff;
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}
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}
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} else {
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const uint16_t* lhs_chars = lhs->GetValue();
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const uint16_t* rhs_chars = rhs->GetValue();
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// FIXME: The MemCmp16() name is misleading. It returns the char difference on mismatch
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// where memcmp() only guarantees that the returned value has the same sign.
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int32_t char_diff = MemCmp16(lhs_chars, rhs_chars, min_count);
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if (char_diff != 0) {
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return char_diff;
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}
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}
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return count_diff;
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}
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ObjPtr<CharArray> String::ToCharArray(Handle<String> h_this, Thread* self) {
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ObjPtr<CharArray> result = CharArray::Alloc(self, h_this->GetLength());
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if (result != nullptr) {
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if (h_this->IsCompressed()) {
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int32_t length = h_this->GetLength();
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const uint8_t* src = h_this->GetValueCompressed();
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uint16_t* dest = result->GetData();
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for (int i = 0; i < length; ++i) {
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dest[i] = src[i];
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}
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} else {
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memcpy(result->GetData(), h_this->GetValue(), h_this->GetLength() * sizeof(uint16_t));
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}
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} else {
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self->AssertPendingOOMException();
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}
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return result;
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}
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void String::GetChars(int32_t start, int32_t end, Handle<CharArray> array, int32_t index) {
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uint16_t* data = array->GetData() + index;
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DCHECK_LE(start, end);
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int32_t length = end - start;
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if (IsCompressed()) {
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const uint8_t* value = GetValueCompressed() + start;
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for (int i = 0; i < length; ++i) {
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data[i] = value[i];
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}
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} else {
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uint16_t* value = GetValue() + start;
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memcpy(data, value, length * sizeof(uint16_t));
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}
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}
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bool String::IsValueNull() {
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return (IsCompressed()) ? (GetValueCompressed() == nullptr) : (GetValue() == nullptr);
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}
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std::string String::PrettyStringDescriptor(ObjPtr<mirror::String> java_descriptor) {
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if (java_descriptor == nullptr) {
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return "null";
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}
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return java_descriptor->PrettyStringDescriptor();
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}
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std::string String::PrettyStringDescriptor() {
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return PrettyDescriptor(ToModifiedUtf8().c_str());
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}
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ObjPtr<String> String::Intern() {
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return Runtime::Current()->GetInternTable()->InternWeak(this);
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}
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} // namespace mirror
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} // namespace art
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