| /* |
| * 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. |
| */ |
| |
| #include "string-inl.h" |
| |
| #include "arch/memcmp16.h" |
| #include "array.h" |
| #include "base/array_ref.h" |
| #include "base/stl_util.h" |
| #include "class-inl.h" |
| #include "gc/accounting/card_table-inl.h" |
| #include "gc_root-inl.h" |
| #include "handle_scope-inl.h" |
| #include "intern_table.h" |
| #include "object-inl.h" |
| #include "runtime.h" |
| #include "string-inl.h" |
| #include "thread.h" |
| #include "utf-inl.h" |
| |
| namespace art { |
| namespace mirror { |
| |
| // TODO: get global references for these |
| GcRoot<Class> String::java_lang_String_; |
| |
| int32_t String::FastIndexOf(int32_t ch, int32_t start) { |
| int32_t count = GetLength(); |
| if (start < 0) { |
| start = 0; |
| } else if (start > count) { |
| start = count; |
| } |
| if (IsCompressed()) { |
| return FastIndexOf<uint8_t>(GetValueCompressed(), ch, start); |
| } else { |
| return FastIndexOf<uint16_t>(GetValue(), ch, start); |
| } |
| } |
| |
| void String::SetClass(ObjPtr<Class> java_lang_String) { |
| CHECK(java_lang_String_.IsNull()); |
| CHECK(java_lang_String != nullptr); |
| CHECK(java_lang_String->IsStringClass()); |
| java_lang_String_ = GcRoot<Class>(java_lang_String); |
| } |
| |
| void String::ResetClass() { |
| CHECK(!java_lang_String_.IsNull()); |
| java_lang_String_ = GcRoot<Class>(nullptr); |
| } |
| |
| int String::ComputeHashCode() { |
| int32_t hash_code = 0; |
| if (IsCompressed()) { |
| hash_code = ComputeUtf16Hash(GetValueCompressed(), GetLength()); |
| } else { |
| hash_code = ComputeUtf16Hash(GetValue(), GetLength()); |
| } |
| SetHashCode(hash_code); |
| return hash_code; |
| } |
| |
| int32_t String::GetUtfLength() { |
| if (IsCompressed()) { |
| return GetLength(); |
| } else { |
| return CountUtf8Bytes(GetValue(), GetLength()); |
| } |
| } |
| |
| inline bool String::AllASCIIExcept(const uint16_t* chars, int32_t length, uint16_t non_ascii) { |
| DCHECK(!IsASCII(non_ascii)); |
| for (int32_t i = 0; i < length; ++i) { |
| if (!IsASCII(chars[i]) && chars[i] != non_ascii) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| ObjPtr<String> String::DoReplace(Thread* self, Handle<String> src, uint16_t old_c, uint16_t new_c) { |
| int32_t length = src->GetLength(); |
| DCHECK(src->IsCompressed() |
| ? ContainsElement(ArrayRef<uint8_t>(src->value_compressed_, length), old_c) |
| : ContainsElement(ArrayRef<uint16_t>(src->value_, length), old_c)); |
| bool compressible = |
| kUseStringCompression && |
| IsASCII(new_c) && |
| (src->IsCompressed() || (!IsASCII(old_c) && AllASCIIExcept(src->value_, length, old_c))); |
| gc::AllocatorType allocator_type = Runtime::Current()->GetHeap()->GetCurrentAllocator(); |
| const int32_t length_with_flag = String::GetFlaggedCount(length, compressible); |
| SetStringCountVisitor visitor(length_with_flag); |
| ObjPtr<String> string = Alloc<true>(self, length_with_flag, allocator_type, visitor); |
| if (UNLIKELY(string == nullptr)) { |
| return nullptr; |
| } |
| if (compressible) { |
| auto replace = [old_c, new_c](uint16_t c) { |
| return dchecked_integral_cast<uint8_t>((old_c != c) ? c : new_c); |
| }; |
| uint8_t* out = string->value_compressed_; |
| if (LIKELY(src->IsCompressed())) { // LIKELY(compressible == src->IsCompressed()) |
| std::transform(src->value_compressed_, src->value_compressed_ + length, out, replace); |
| } else { |
| std::transform(src->value_, src->value_ + length, out, replace); |
| } |
| DCHECK(kUseStringCompression && AllASCII(out, length)); |
| } else { |
| auto replace = [old_c, new_c](uint16_t c) { |
| return (old_c != c) ? c : new_c; |
| }; |
| uint16_t* out = string->value_; |
| if (UNLIKELY(src->IsCompressed())) { // LIKELY(compressible == src->IsCompressed()) |
| std::transform(src->value_compressed_, src->value_compressed_ + length, out, replace); |
| } else { |
| std::transform(src->value_, src->value_ + length, out, replace); |
| } |
| DCHECK(!kUseStringCompression || !AllASCII(out, length)); |
| } |
| return string; |
| } |
| |
| String* String::AllocFromStrings(Thread* self, Handle<String> string, Handle<String> string2) { |
| int32_t length = string->GetLength(); |
| int32_t length2 = string2->GetLength(); |
| gc::AllocatorType allocator_type = Runtime::Current()->GetHeap()->GetCurrentAllocator(); |
| const bool compressible = kUseStringCompression && |
| (string->IsCompressed() && string2->IsCompressed()); |
| const int32_t length_with_flag = String::GetFlaggedCount(length + length2, compressible); |
| |
| SetStringCountVisitor visitor(length_with_flag); |
| ObjPtr<String> new_string = Alloc<true>(self, length_with_flag, allocator_type, visitor); |
| if (UNLIKELY(new_string == nullptr)) { |
| return nullptr; |
| } |
| if (compressible) { |
| uint8_t* new_value = new_string->GetValueCompressed(); |
| memcpy(new_value, string->GetValueCompressed(), length * sizeof(uint8_t)); |
| memcpy(new_value + length, string2->GetValueCompressed(), length2 * sizeof(uint8_t)); |
| } else { |
| uint16_t* new_value = new_string->GetValue(); |
| if (string->IsCompressed()) { |
| for (int i = 0; i < length; ++i) { |
| new_value[i] = string->CharAt(i); |
| } |
| } else { |
| memcpy(new_value, string->GetValue(), length * sizeof(uint16_t)); |
| } |
| if (string2->IsCompressed()) { |
| for (int i = 0; i < length2; ++i) { |
| new_value[i+length] = string2->CharAt(i); |
| } |
| } else { |
| memcpy(new_value + length, string2->GetValue(), length2 * sizeof(uint16_t)); |
| } |
| } |
| return new_string.Ptr(); |
| } |
| |
| String* String::AllocFromUtf16(Thread* self, int32_t utf16_length, const uint16_t* utf16_data_in) { |
| CHECK(utf16_data_in != nullptr || utf16_length == 0); |
| gc::AllocatorType allocator_type = Runtime::Current()->GetHeap()->GetCurrentAllocator(); |
| const bool compressible = kUseStringCompression && |
| String::AllASCII<uint16_t>(utf16_data_in, utf16_length); |
| int32_t length_with_flag = String::GetFlaggedCount(utf16_length, compressible); |
| SetStringCountVisitor visitor(length_with_flag); |
| ObjPtr<String> string = Alloc<true>(self, length_with_flag, allocator_type, visitor); |
| if (UNLIKELY(string == nullptr)) { |
| return nullptr; |
| } |
| if (compressible) { |
| for (int i = 0; i < utf16_length; ++i) { |
| string->GetValueCompressed()[i] = static_cast<uint8_t>(utf16_data_in[i]); |
| } |
| } else { |
| uint16_t* array = string->GetValue(); |
| memcpy(array, utf16_data_in, utf16_length * sizeof(uint16_t)); |
| } |
| return string.Ptr(); |
| } |
| |
| String* String::AllocFromModifiedUtf8(Thread* self, const char* utf) { |
| DCHECK(utf != nullptr); |
| size_t byte_count = strlen(utf); |
| size_t char_count = CountModifiedUtf8Chars(utf, byte_count); |
| return AllocFromModifiedUtf8(self, char_count, utf, byte_count); |
| } |
| |
| String* String::AllocFromModifiedUtf8(Thread* self, |
| int32_t utf16_length, |
| const char* utf8_data_in) { |
| return AllocFromModifiedUtf8(self, utf16_length, utf8_data_in, strlen(utf8_data_in)); |
| } |
| |
| String* String::AllocFromModifiedUtf8(Thread* self, |
| int32_t utf16_length, |
| const char* utf8_data_in, |
| int32_t utf8_length) { |
| gc::AllocatorType allocator_type = Runtime::Current()->GetHeap()->GetCurrentAllocator(); |
| const bool compressible = kUseStringCompression && (utf16_length == utf8_length); |
| const int32_t utf16_length_with_flag = String::GetFlaggedCount(utf16_length, compressible); |
| SetStringCountVisitor visitor(utf16_length_with_flag); |
| ObjPtr<String> string = Alloc<true>(self, utf16_length_with_flag, allocator_type, visitor); |
| if (UNLIKELY(string == nullptr)) { |
| return nullptr; |
| } |
| if (compressible) { |
| memcpy(string->GetValueCompressed(), utf8_data_in, utf16_length * sizeof(uint8_t)); |
| } else { |
| uint16_t* utf16_data_out = string->GetValue(); |
| ConvertModifiedUtf8ToUtf16(utf16_data_out, utf16_length, utf8_data_in, utf8_length); |
| } |
| return string.Ptr(); |
| } |
| |
| bool String::Equals(ObjPtr<String> that) { |
| if (this == that) { |
| // Quick reference equality test |
| return true; |
| } else if (that == nullptr) { |
| // Null isn't an instanceof anything |
| return false; |
| } else if (this->GetLength() != that->GetLength()) { |
| // Quick length inequality test |
| return false; |
| } else { |
| // Note: don't short circuit on hash code as we're presumably here as the |
| // hash code was already equal |
| for (int32_t i = 0; i < that->GetLength(); ++i) { |
| if (this->CharAt(i) != that->CharAt(i)) { |
| return false; |
| } |
| } |
| return true; |
| } |
| } |
| |
| bool String::Equals(const uint16_t* that_chars, int32_t that_offset, int32_t that_length) { |
| if (this->GetLength() != that_length) { |
| return false; |
| } else { |
| for (int32_t i = 0; i < that_length; ++i) { |
| if (this->CharAt(i) != that_chars[that_offset + i]) { |
| return false; |
| } |
| } |
| return true; |
| } |
| } |
| |
| bool String::Equals(const char* modified_utf8) { |
| const int32_t length = GetLength(); |
| int32_t i = 0; |
| while (i < length) { |
| const uint32_t ch = GetUtf16FromUtf8(&modified_utf8); |
| if (ch == '\0') { |
| return false; |
| } |
| |
| if (GetLeadingUtf16Char(ch) != CharAt(i++)) { |
| return false; |
| } |
| |
| const uint16_t trailing = GetTrailingUtf16Char(ch); |
| if (trailing != 0) { |
| if (i == length) { |
| return false; |
| } |
| |
| if (CharAt(i++) != trailing) { |
| return false; |
| } |
| } |
| } |
| return *modified_utf8 == '\0'; |
| } |
| |
| bool String::Equals(const StringPiece& modified_utf8) { |
| const int32_t length = GetLength(); |
| const char* p = modified_utf8.data(); |
| for (int32_t i = 0; i < length; ++i) { |
| uint32_t ch = GetUtf16FromUtf8(&p); |
| |
| if (GetLeadingUtf16Char(ch) != CharAt(i)) { |
| return false; |
| } |
| |
| const uint16_t trailing = GetTrailingUtf16Char(ch); |
| if (trailing != 0) { |
| if (i == (length - 1)) { |
| return false; |
| } |
| |
| if (CharAt(++i) != trailing) { |
| return false; |
| } |
| } |
| } |
| return true; |
| } |
| |
| // Create a modified UTF-8 encoded std::string from a java/lang/String object. |
| std::string String::ToModifiedUtf8() { |
| size_t byte_count = GetUtfLength(); |
| std::string result(byte_count, static_cast<char>(0)); |
| if (IsCompressed()) { |
| for (size_t i = 0; i < byte_count; ++i) { |
| result[i] = static_cast<char>(CharAt(i)); |
| } |
| } else { |
| const uint16_t* chars = GetValue(); |
| ConvertUtf16ToModifiedUtf8(&result[0], byte_count, chars, GetLength()); |
| } |
| return result; |
| } |
| |
| int32_t String::CompareTo(ObjPtr<String> rhs) { |
| // Quick test for comparison of a string with itself. |
| ObjPtr<String> lhs = this; |
| if (lhs == rhs) { |
| return 0; |
| } |
| int32_t lhs_count = lhs->GetLength(); |
| int32_t rhs_count = rhs->GetLength(); |
| int32_t count_diff = lhs_count - rhs_count; |
| int32_t min_count = (count_diff < 0) ? lhs_count : rhs_count; |
| if (lhs->IsCompressed() && rhs->IsCompressed()) { |
| const uint8_t* lhs_chars = lhs->GetValueCompressed(); |
| const uint8_t* rhs_chars = rhs->GetValueCompressed(); |
| for (int32_t i = 0; i < min_count; ++i) { |
| int32_t char_diff = static_cast<int32_t>(lhs_chars[i]) - static_cast<int32_t>(rhs_chars[i]); |
| if (char_diff != 0) { |
| return char_diff; |
| } |
| } |
| } else if (lhs->IsCompressed() || rhs->IsCompressed()) { |
| const uint8_t* compressed_chars = |
| lhs->IsCompressed() ? lhs->GetValueCompressed() : rhs->GetValueCompressed(); |
| const uint16_t* uncompressed_chars = lhs->IsCompressed() ? rhs->GetValue() : lhs->GetValue(); |
| for (int32_t i = 0; i < min_count; ++i) { |
| int32_t char_diff = |
| static_cast<int32_t>(compressed_chars[i]) - static_cast<int32_t>(uncompressed_chars[i]); |
| if (char_diff != 0) { |
| return lhs->IsCompressed() ? char_diff : -char_diff; |
| } |
| } |
| } else { |
| const uint16_t* lhs_chars = lhs->GetValue(); |
| const uint16_t* rhs_chars = rhs->GetValue(); |
| // FIXME: The MemCmp16() name is misleading. It returns the char difference on mismatch |
| // where memcmp() only guarantees that the returned value has the same sign. |
| int32_t char_diff = MemCmp16(lhs_chars, rhs_chars, min_count); |
| if (char_diff != 0) { |
| return char_diff; |
| } |
| } |
| return count_diff; |
| } |
| |
| void String::VisitRoots(RootVisitor* visitor) { |
| java_lang_String_.VisitRootIfNonNull(visitor, RootInfo(kRootStickyClass)); |
| } |
| |
| CharArray* String::ToCharArray(Thread* self) { |
| StackHandleScope<1> hs(self); |
| Handle<String> string(hs.NewHandle(this)); |
| ObjPtr<CharArray> result = CharArray::Alloc(self, GetLength()); |
| if (result != nullptr) { |
| if (string->IsCompressed()) { |
| int32_t length = string->GetLength(); |
| for (int i = 0; i < length; ++i) { |
| result->GetData()[i] = string->CharAt(i); |
| } |
| } else { |
| memcpy(result->GetData(), string->GetValue(), string->GetLength() * sizeof(uint16_t)); |
| } |
| } else { |
| self->AssertPendingOOMException(); |
| } |
| return result.Ptr(); |
| } |
| |
| void String::GetChars(int32_t start, int32_t end, Handle<CharArray> array, int32_t index) { |
| uint16_t* data = array->GetData() + index; |
| if (IsCompressed()) { |
| for (int i = start; i < end; ++i) { |
| data[i-start] = CharAt(i); |
| } |
| } else { |
| uint16_t* value = GetValue() + start; |
| memcpy(data, value, (end - start) * sizeof(uint16_t)); |
| } |
| } |
| |
| bool String::IsValueNull() { |
| return (IsCompressed()) ? (GetValueCompressed() == nullptr) : (GetValue() == nullptr); |
| } |
| |
| std::string String::PrettyStringDescriptor(ObjPtr<mirror::String> java_descriptor) { |
| if (java_descriptor == nullptr) { |
| return "null"; |
| } |
| return java_descriptor->PrettyStringDescriptor(); |
| } |
| |
| std::string String::PrettyStringDescriptor() { |
| return PrettyDescriptor(ToModifiedUtf8().c_str()); |
| } |
| |
| ObjPtr<String> String::Intern() { |
| return Runtime::Current()->GetInternTable()->InternWeak(this); |
| } |
| |
| } // namespace mirror |
| } // namespace art |