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/*
* 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.
*/
#ifndef ART_RUNTIME_MIRROR_STRING_H_
#define ART_RUNTIME_MIRROR_STRING_H_
#include "gc_root.h"
#include "gc/allocator_type.h"
#include "object.h"
#include "object_callbacks.h"
namespace art {
template<class T> class Handle;
struct StringOffsets;
class StringPiece;
namespace mirror {
// C++ mirror of java.lang.String
class MANAGED String FINAL : public Object {
public:
// Size of java.lang.String.class.
static uint32_t ClassSize(size_t pointer_size);
// Size of an instance of java.lang.String not including its value array.
static constexpr uint32_t InstanceSize() {
return sizeof(String);
}
static MemberOffset CountOffset() {
return OFFSET_OF_OBJECT_MEMBER(String, count_);
}
static MemberOffset ValueOffset() {
return OFFSET_OF_OBJECT_MEMBER(String, value_);
}
uint16_t* GetValue() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
return &value_[0];
}
template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags>
size_t SizeOf() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags>
int32_t GetLength() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
return GetField32<kVerifyFlags>(OFFSET_OF_OBJECT_MEMBER(String, count_));
}
void SetCount(int32_t new_count) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
// Count is invariant so use non-transactional mode. Also disable check as we may run inside
// a transaction.
DCHECK_LE(0, new_count);
SetField32<false, false>(OFFSET_OF_OBJECT_MEMBER(String, count_), new_count);
}
int32_t GetHashCode() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// Computes, stores, and returns the hash code.
int32_t ComputeHashCode() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
int32_t GetUtfLength() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
uint16_t CharAt(int32_t index) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
void SetCharAt(int32_t index, uint16_t c) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
String* Intern() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
template <bool kIsInstrumented, typename PreFenceVisitor>
ALWAYS_INLINE static String* Alloc(Thread* self, int32_t utf16_length,
gc::AllocatorType allocator_type,
const PreFenceVisitor& pre_fence_visitor)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
template <bool kIsInstrumented>
ALWAYS_INLINE static String* AllocFromByteArray(Thread* self, int32_t byte_length,
Handle<ByteArray> array, int32_t offset,
int32_t high_byte,
gc::AllocatorType allocator_type)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
template <bool kIsInstrumented>
ALWAYS_INLINE static String* AllocFromCharArray(Thread* self, int32_t array_length,
Handle<CharArray> array, int32_t offset,
gc::AllocatorType allocator_type)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
template <bool kIsInstrumented>
ALWAYS_INLINE static String* AllocFromString(Thread* self, int32_t string_length,
Handle<String> string, int32_t offset,
gc::AllocatorType allocator_type)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
static String* AllocFromStrings(Thread* self, Handle<String> string, Handle<String> string2)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
static String* AllocFromUtf16(Thread* self, int32_t utf16_length, const uint16_t* utf16_data_in)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
static String* AllocFromModifiedUtf8(Thread* self, const char* utf)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
static String* AllocFromModifiedUtf8(Thread* self, int32_t utf16_length, const char* utf8_data_in)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// TODO: This is only used in the interpreter to compare against
// entries from a dex files constant pool (ArtField names). Should
// we unify this with Equals(const StringPiece&); ?
bool Equals(const char* modified_utf8) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// TODO: This is only used to compare DexCache.location with
// a dex_file's location (which is an std::string). Do we really
// need this in mirror::String just for that one usage ?
bool Equals(const StringPiece& modified_utf8)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
bool Equals(String* that) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// Compare UTF-16 code point values not in a locale-sensitive manner
int Compare(int32_t utf16_length, const char* utf8_data_in);
// TODO: do we need this overload? give it a more intention-revealing name.
bool Equals(const uint16_t* that_chars, int32_t that_offset,
int32_t that_length)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// Create a modified UTF-8 encoded std::string from a java/lang/String object.
std::string ToModifiedUtf8() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
int32_t FastIndexOf(int32_t ch, int32_t start) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
int32_t CompareTo(String* other) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
CharArray* ToCharArray(Thread* self) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
void GetChars(int32_t start, int32_t end, Handle<CharArray> array, int32_t index)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
static Class* GetJavaLangString() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
DCHECK(!java_lang_String_.IsNull());
return java_lang_String_.Read();
}
static void SetClass(Class* java_lang_String);
static void ResetClass();
static void VisitRoots(RootVisitor* visitor)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
private:
void SetHashCode(int32_t new_hash_code) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
// Hash code is invariant so use non-transactional mode. Also disable check as we may run inside
// a transaction.
DCHECK_EQ(0, GetField32(OFFSET_OF_OBJECT_MEMBER(String, hash_code_)));
SetField32<false, false>(OFFSET_OF_OBJECT_MEMBER(String, hash_code_), new_hash_code);
}
// Field order required by test "ValidateFieldOrderOfJavaCppUnionClasses".
int32_t count_;
uint32_t hash_code_;
uint16_t value_[0];
static GcRoot<Class> java_lang_String_;
friend struct art::StringOffsets; // for verifying offset information
ART_FRIEND_TEST(ObjectTest, StringLength); // for SetOffset and SetCount
DISALLOW_IMPLICIT_CONSTRUCTORS(String);
};
} // namespace mirror
} // namespace art
#endif // ART_RUNTIME_MIRROR_STRING_H_
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