blob: 33aca0304ce1d8164a569a756ef1761370de4ac1 [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 "class-inl.h"
#include "gc/accounting/card_table-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;
}
const uint16_t* chars = GetValue();
const uint16_t* p = chars + start;
const uint16_t* end = chars + count;
while (p < end) {
if (*p++ == ch) {
return (p - 1) - chars;
}
}
return -1;
}
void String::SetClass(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() {
const int32_t hash_code = ComputeUtf16Hash(GetValue(), GetLength());
SetHashCode(hash_code);
return hash_code;
}
int32_t String::GetUtfLength() {
return CountUtf8Bytes(GetValue(), GetLength());
}
void String::SetCharAt(int32_t index, uint16_t c) {
DCHECK((index >= 0) && (index < count_));
GetValue()[index] = c;
}
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();
SetStringCountVisitor visitor(length + length2);
String* new_string = Alloc<true>(self, length + length2, allocator_type, visitor);
if (UNLIKELY(new_string == nullptr)) {
return nullptr;
}
uint16_t* new_value = new_string->GetValue();
memcpy(new_value, string->GetValue(), length * sizeof(uint16_t));
memcpy(new_value + length, string2->GetValue(), length2 * sizeof(uint16_t));
return new_string;
}
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();
SetStringCountVisitor visitor(utf16_length);
String* string = Alloc<true>(self, utf16_length, allocator_type, visitor);
if (UNLIKELY(string == nullptr)) {
return nullptr;
}
uint16_t* array = string->GetValue();
memcpy(array, utf16_data_in, utf16_length * sizeof(uint16_t));
return string;
}
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();
SetStringCountVisitor visitor(utf16_length);
String* string = Alloc<true>(self, utf16_length, allocator_type, visitor);
if (UNLIKELY(string == nullptr)) {
return nullptr;
}
uint16_t* utf16_data_out = string->GetValue();
ConvertModifiedUtf8ToUtf16(utf16_data_out, utf16_length, utf8_data_in, utf8_length);
return string;
}
bool String::Equals(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() {
const uint16_t* chars = GetValue();
size_t byte_count = GetUtfLength();
std::string result(byte_count, static_cast<char>(0));
ConvertUtf16ToModifiedUtf8(&result[0], byte_count, chars, GetLength());
return result;
}
int32_t String::CompareTo(String* rhs) {
// Quick test for comparison of a string with itself.
String* lhs = this;
if (lhs == rhs) {
return 0;
}
// TODO: is this still true?
// The annoying part here is that 0x00e9 - 0xffff != 0x00ea,
// because the interpreter converts the characters to 32-bit integers
// *without* sign extension before it subtracts them (which makes some
// sense since "char" is unsigned). So what we get is the result of
// 0x000000e9 - 0x0000ffff, which is 0xffff00ea.
int32_t lhsCount = lhs->GetLength();
int32_t rhsCount = rhs->GetLength();
int32_t countDiff = lhsCount - rhsCount;
int32_t minCount = (countDiff < 0) ? lhsCount : rhsCount;
const uint16_t* lhsChars = lhs->GetValue();
const uint16_t* rhsChars = rhs->GetValue();
int32_t otherRes = MemCmp16(lhsChars, rhsChars, minCount);
if (otherRes != 0) {
return otherRes;
}
return countDiff;
}
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));
CharArray* result = CharArray::Alloc(self, GetLength());
if (result != nullptr) {
memcpy(result->GetData(), string->GetValue(), string->GetLength() * sizeof(uint16_t));
} else {
self->AssertPendingOOMException();
}
return result;
}
void String::GetChars(int32_t start, int32_t end, Handle<CharArray> array, int32_t index) {
uint16_t* data = array->GetData() + index;
uint16_t* value = GetValue() + start;
memcpy(data, value, (end - start) * sizeof(uint16_t));
}
} // namespace mirror
} // namespace art