blob: 6208a962e54524ae19e4be9b5c5428c00b8ba4ee [file] [log] [blame]
/*
* 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 "dex/descriptors_names.h"
#include "dex/utf-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"
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