Merge "Reland "libutils: Introduce StaticString16""" am: d3fa47bb05 am: 584af3282c am: 2ac1ed0828 (ec52dd38) · Commits · e / os / android_system_core

libutils/Android.bp

+1 −0

Original line number	Diff line number	Diff line
		@@ -205,6 +205,7 @@ cc_test {
		"Mutex_test.cpp",
		"SharedBuffer_test.cpp",
		"String8_test.cpp",
		"String16_test.cpp",
		"StrongPointer_test.cpp",
		"Unicode_test.cpp",
		"Vector_test.cpp",

libutils/SharedBuffer.cpp

+1 −0

Original line number	Diff line number	Diff line
		@@ -41,6 +41,7 @@ SharedBuffer* SharedBuffer::alloc(size_t size)
		// The following is OK on Android-supported platforms.
		sb->mRefs.store(1, std::memory_order_relaxed);
		sb->mSize = size;
		sb->mClientMetadata = 0;
		}
		return sb;
		}

libutils/SharedBuffer.h

+6 −1

Original line number	Diff line number	Diff line
		@@ -102,7 +102,12 @@ private:
		// Must be sized to preserve correct alignment.
		mutable std::atomic<int32_t> mRefs;
		size_t mSize;
		uint32_t mReserved[2];
		uint32_t mReserved;
		public:
		// mClientMetadata is reserved for client use. It is initialized to 0
		// and the clients can do whatever they want with it. Note that this is
		// placed last so that it is adjcent to the buffer allocated.
		uint32_t mClientMetadata;
		};

		static_assert(sizeof(SharedBuffer) % 8 == 0

libutils/String16.cpp

+111 −46

Original line number	Diff line number	Diff line
		@@ -24,21 +24,21 @@

		namespace android {

		static const StaticString16 emptyString(u"");
		static inline char16_t* getEmptyString() {
		static SharedBuffer* gEmptyStringBuf = [] {
		SharedBuffer* buf = SharedBuffer::alloc(sizeof(char16_t));
		char16_t* str = static_cast<char16_t*>(buf->data());
		*str = 0;
		return buf;
		}();

		gEmptyStringBuf->acquire();
		return static_cast<char16_t*>(gEmptyStringBuf->data());
		return const_cast<char16_t*>(emptyString.string());
		}

		// ---------------------------------------------------------------------------

		static char16_t* allocFromUTF8(const char* u8str, size_t u8len)
		void* String16::alloc(size_t size)
		{
		SharedBuffer* buf = SharedBuffer::alloc(size);
		buf->mClientMetadata = kIsSharedBufferAllocated;
		return buf;
		}

		char16_t* String16::allocFromUTF8(const char* u8str, size_t u8len)
		{
		if (u8len == 0) return getEmptyString();

		@@ -49,7 +49,7 @@ static char16_t* allocFromUTF8(const char* u8str, size_t u8len)
		return getEmptyString();
		}

		SharedBuffer* buf = SharedBuffer::alloc(sizeof(char16_t)*(u16len+1));
		SharedBuffer* buf = static_cast<SharedBuffer>(alloc(sizeof(char16_t) (u16len + 1)));
		if (buf) {
		u8cur = (const uint8_t*) u8str;
		char16_t* u16str = (char16_t*)buf->data();
		@@ -66,13 +66,13 @@ static char16_t* allocFromUTF8(const char* u8str, size_t u8len)
		return getEmptyString();
		}

		static char16_t* allocFromUTF16(const char16_t* u16str, size_t u16len) {
		char16_t* String16::allocFromUTF16(const char16_t* u16str, size_t u16len) {
		if (u16len >= SIZE_MAX / sizeof(char16_t)) {
		android_errorWriteLog(0x534e4554, "73826242");
		abort();
		}

		SharedBuffer* buf = SharedBuffer::alloc((u16len + 1) * sizeof(char16_t));
		SharedBuffer* buf = static_cast<SharedBuffer>(alloc((u16len + 1) sizeof(char16_t)));
		ALOG_ASSERT(buf, "Unable to allocate shared buffer");
		if (buf) {
		char16_t* str = (char16_t*)buf->data();
		@@ -97,8 +97,8 @@ String16::String16(StaticLinkage)
		// having run. In this case we always allocate an empty string. It's less
		// efficient than using getEmptyString(), but we assume it's uncommon.

		char16_t* data = static_cast<char16_t*>(
		SharedBuffer::alloc(sizeof(char16_t))->data());
		SharedBuffer* buf = static_cast<SharedBuffer*>(alloc(sizeof(char16_t)));
		char16_t* data = static_cast<char16_t*>(buf->data());
		data[0] = 0;
		mString = data;
		}
		@@ -106,7 +106,7 @@ String16::String16(StaticLinkage)
		String16::String16(const String16& o)
		: mString(o.mString)
		{
		SharedBuffer::bufferFromData(mString)->acquire();
		acquire();
		}

		String16::String16(const String16& o, size_t len, size_t begin)
		@@ -136,26 +136,30 @@ String16::String16(const char* o, size_t len)

		String16::~String16()
		{
		SharedBuffer::bufferFromData(mString)->release();
		release();
		}

		size_t String16::size() const
		{
		if (isStaticString()) {
		return staticStringSize();
		} else {
		return SharedBuffer::sizeFromData(mString) / sizeof(char16_t) - 1;
		}
		}

		void String16::setTo(const String16& other)
		{
		SharedBuffer::bufferFromData(other.mString)->acquire();
		SharedBuffer::bufferFromData(mString)->release();
		release();
		mString = other.mString;
		acquire();
		}

		status_t String16::setTo(const String16& other, size_t len, size_t begin)
		{
		const size_t N = other.size();
		if (begin >= N) {
		SharedBuffer::bufferFromData(mString)->release();
		release();
		mString = getEmptyString();
		return OK;
		}
		@@ -184,8 +188,7 @@ status_t String16::setTo(const char16_t* other, size_t len)
		abort();
		}

		SharedBuffer* buf = SharedBuffer::bufferFromData(mString)
		->editResize((len+1)*sizeof(char16_t));
		SharedBuffer* buf = static_cast<SharedBuffer>(editResize((len + 1) sizeof(char16_t)));
		if (buf) {
		char16_t* str = (char16_t*)buf->data();
		memmove(str, other, len*sizeof(char16_t));
		@@ -212,8 +215,8 @@ status_t String16::append(const String16& other)
		abort();
		}

		SharedBuffer* buf = SharedBuffer::bufferFromData(mString)
		->editResize((myLen+otherLen+1)*sizeof(char16_t));
		SharedBuffer* buf =
		static_cast<SharedBuffer>(editResize((myLen + otherLen + 1) sizeof(char16_t)));
		if (buf) {
		char16_t* str = (char16_t*)buf->data();
		memcpy(str+myLen, other, (otherLen+1)*sizeof(char16_t));
		@@ -238,8 +241,8 @@ status_t String16::append(const char16_t* chrs, size_t otherLen)
		abort();
		}

		SharedBuffer* buf = SharedBuffer::bufferFromData(mString)
		->editResize((myLen+otherLen+1)*sizeof(char16_t));
		SharedBuffer* buf =
		static_cast<SharedBuffer>(editResize((myLen + otherLen + 1) sizeof(char16_t)));
		if (buf) {
		char16_t* str = (char16_t*)buf->data();
		memcpy(str+myLen, chrs, otherLen*sizeof(char16_t));
		@@ -273,8 +276,8 @@ status_t String16::insert(size_t pos, const char16_t* chrs, size_t len)
		len, myLen, String8(chrs, len).string());
		#endif

		SharedBuffer* buf = SharedBuffer::bufferFromData(mString)
		->editResize((myLen+len+1)*sizeof(char16_t));
		SharedBuffer* buf =
		static_cast<SharedBuffer>(editResize((myLen + len + 1) sizeof(char16_t)));
		if (buf) {
		char16_t* str = (char16_t*)buf->data();
		if (pos < myLen) {
		@@ -338,23 +341,87 @@ bool String16::contains(const char16_t* chrs) const
		return strstr16(mString, chrs) != nullptr;
		}

		void* String16::edit() {
		SharedBuffer* buf;
		if (isStaticString()) {
		buf = static_cast<SharedBuffer>(alloc((size() + 1) sizeof(char16_t)));
		if (buf) {
		buf->acquire();
		memcpy(buf->data(), mString, (size() + 1) * sizeof(char16_t));
		}
		} else {
		buf = SharedBuffer::bufferFromData(mString)->edit();
		buf->mClientMetadata = kIsSharedBufferAllocated;
		}
		return buf;
		}

		void* String16::editResize(size_t newSize) {
		SharedBuffer* buf;
		if (isStaticString()) {
		size_t copySize = (size() + 1) * sizeof(char16_t);
		if (newSize < copySize) {
		copySize = newSize;
		}
		buf = static_cast<SharedBuffer*>(alloc(newSize));
		if (buf) {
		buf->acquire();
		memcpy(buf->data(), mString, copySize);
		}
		} else {
		buf = SharedBuffer::bufferFromData(mString)->editResize(newSize);
		buf->mClientMetadata = kIsSharedBufferAllocated;
		}
		return buf;
		}

		void String16::acquire()
		{
		if (!isStaticString()) {
		SharedBuffer::bufferFromData(mString)->acquire();
		}
		}

		void String16::release()
		{
		if (!isStaticString()) {
		SharedBuffer::bufferFromData(mString)->release();
		}
		}

		bool String16::isStaticString() const {
		// See String16.h for notes on the memory layout of String16::StaticData and
		// SharedBuffer.
		static_assert(sizeof(SharedBuffer) - offsetof(SharedBuffer, mClientMetadata) == 4);
		const uint32_t* p = reinterpret_cast<const uint32_t*>(mString);
		return (*(p - 1) & kIsSharedBufferAllocated) == 0;
		}

		size_t String16::staticStringSize() const {
		// See String16.h for notes on the memory layout of String16::StaticData and
		// SharedBuffer.
		static_assert(sizeof(SharedBuffer) - offsetof(SharedBuffer, mClientMetadata) == 4);
		const uint32_t* p = reinterpret_cast<const uint32_t*>(mString);
		return static_cast<size_t>(*(p - 1));
		}

		status_t String16::makeLower()
		{
		const size_t N = size();
		const char16_t* str = string();
		char16_t* edit = nullptr;
		char16_t* edited = nullptr;
		for (size_t i=0; i<N; i++) {
		const char16_t v = str[i];
		if (v >= 'A' && v <= 'Z') {
		if (!edit) {
		SharedBuffer* buf = SharedBuffer::bufferFromData(mString)->edit();
		if (!edited) {
		SharedBuffer* buf = static_cast<SharedBuffer*>(edit());
		if (!buf) {
		return NO_MEMORY;
		}
		edit = (char16_t*)buf->data();
		mString = str = edit;
		edited = (char16_t*)buf->data();
		mString = str = edited;
		}
		edit[i] = tolower((char)v);
		edited[i] = tolower((char)v);
		}
		}
		return OK;
		@@ -364,18 +431,18 @@ status_t String16::replaceAll(char16_t replaceThis, char16_t withThis)
		{
		const size_t N = size();
		const char16_t* str = string();
		char16_t* edit = nullptr;
		char16_t* edited = nullptr;
		for (size_t i=0; i<N; i++) {
		if (str[i] == replaceThis) {
		if (!edit) {
		SharedBuffer* buf = SharedBuffer::bufferFromData(mString)->edit();
		if (!edited) {
		SharedBuffer* buf = static_cast<SharedBuffer*>(edit());
		if (!buf) {
		return NO_MEMORY;
		}
		edit = (char16_t*)buf->data();
		mString = str = edit;
		edited = (char16_t*)buf->data();
		mString = str = edited;
		}
		edit[i] = withThis;
		edited[i] = withThis;
		}
		}
		return OK;
		@@ -385,7 +452,7 @@ status_t String16::remove(size_t len, size_t begin)
		{
		const size_t N = size();
		if (begin >= N) {
		SharedBuffer::bufferFromData(mString)->release();
		release();
		mString = getEmptyString();
		return OK;
		}
		@@ -395,8 +462,7 @@ status_t String16::remove(size_t len, size_t begin)
		}

		if (begin > 0) {
		SharedBuffer* buf = SharedBuffer::bufferFromData(mString)
		->editResize((N+1)*sizeof(char16_t));
		SharedBuffer* buf = static_cast<SharedBuffer>(editResize((N + 1) sizeof(char16_t)));
		if (!buf) {
		return NO_MEMORY;
		}
		@@ -404,8 +470,7 @@ status_t String16::remove(size_t len, size_t begin)
		memmove(str, str+begin, (N-begin+1)*sizeof(char16_t));
		mString = str;
		}
		SharedBuffer* buf = SharedBuffer::bufferFromData(mString)
		->editResize((len+1)*sizeof(char16_t));
		SharedBuffer* buf = static_cast<SharedBuffer>(editResize((len + 1) sizeof(char16_t)));
		if (buf) {
		char16_t* str = (char16_t*)buf->data();
		str[len] = 0;

libutils/String16_test.cpp

0 → 100644

+218 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2019 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 <utils/String16.h>
		#include <utils/String8.h>

		#include <gtest/gtest.h>

		namespace android {

		::testing::AssertionResult Char16_tStringEquals(const char16_t* a, const char16_t* b) {
		if (strcmp16(a, b) != 0) {
		return ::testing::AssertionFailure()
		<< "\"" << String8(a).c_str() << "\" not equal to \"" << String8(b).c_str() << "\"";
		}
		return ::testing::AssertionSuccess();
		}

		#define EXPECT_STR16EQ(a, b) EXPECT_TRUE(Char16_tStringEquals(a, b))

		TEST(String16Test, FromChar16_t) {
		String16 tmp(u"Verify me");
		EXPECT_STR16EQ(u"Verify me", tmp);
		}

		TEST(String16Test, FromChar16_tSized) {
		String16 tmp(u"Verify me", 7);
		EXPECT_STR16EQ(u"Verify ", tmp);
		}

		TEST(String16Test, FromChar) {
		String16 tmp("Verify me");
		EXPECT_STR16EQ(u"Verify me", tmp);
		}

		TEST(String16Test, FromCharSized) {
		String16 tmp("Verify me", 7);
		EXPECT_STR16EQ(u"Verify ", tmp);
		}

		TEST(String16Test, Copy) {
		String16 tmp("Verify me");
		String16 another = tmp;
		EXPECT_STR16EQ(u"Verify me", tmp);
		EXPECT_STR16EQ(u"Verify me", another);
		}

		TEST(String16Test, Move) {
		String16 tmp("Verify me");
		String16 another(std::move(tmp));
		EXPECT_STR16EQ(u"Verify me", another);
		}

		TEST(String16Test, Size) {
		String16 tmp("Verify me");
		EXPECT_EQ(9U, tmp.size());
		}

		TEST(String16Test, setTo) {
		String16 tmp("Verify me");
		tmp.setTo(u"New content");
		EXPECT_EQ(11U, tmp.size());
		EXPECT_STR16EQ(u"New content", tmp);
		}

		TEST(String16Test, Append) {
		String16 tmp("Verify me");
		tmp.append(String16("Hello"));
		EXPECT_EQ(14U, tmp.size());
		EXPECT_STR16EQ(u"Verify meHello", tmp);
		}

		TEST(String16Test, Insert) {
		String16 tmp("Verify me");
		tmp.insert(6, u"Insert");
		EXPECT_EQ(15U, tmp.size());
		EXPECT_STR16EQ(u"VerifyInsert me", tmp);
		}

		TEST(String16Test, Remove) {
		String16 tmp("Verify me");
		tmp.remove(2, 6);
		EXPECT_EQ(2U, tmp.size());
		EXPECT_STR16EQ(u" m", tmp);
		}

		TEST(String16Test, MakeLower) {
		String16 tmp("Verify Me!");
		tmp.makeLower();
		EXPECT_EQ(10U, tmp.size());
		EXPECT_STR16EQ(u"verify me!", tmp);
		}

		TEST(String16Test, ReplaceAll) {
		String16 tmp("Verify verify Verify");
		tmp.replaceAll(u'r', u'!');
		EXPECT_STR16EQ(u"Ve!ify ve!ify Ve!ify", tmp);
		}

		TEST(String16Test, Compare) {
		String16 tmp("Verify me");
		EXPECT_EQ(String16(u"Verify me"), tmp);
		}

		TEST(String16Test, StaticString) {
		String16 nonStaticString("NonStatic");
		StaticString16 staticString(u"Static");

		EXPECT_TRUE(staticString.isStaticString());
		EXPECT_FALSE(nonStaticString.isStaticString());
		}

		TEST(String16Test, StaticStringCopy) {
		StaticString16 tmp(u"Verify me");
		String16 another = tmp;
		EXPECT_STR16EQ(u"Verify me", tmp);
		EXPECT_STR16EQ(u"Verify me", another);
		EXPECT_TRUE(tmp.isStaticString());
		EXPECT_TRUE(another.isStaticString());
		}

		TEST(String16Test, StaticStringMove) {
		StaticString16 tmp(u"Verify me");
		String16 another(std::move(tmp));
		EXPECT_STR16EQ(u"Verify me", another);
		EXPECT_TRUE(another.isStaticString());
		}

		TEST(String16Test, StaticStringSize) {
		StaticString16 tmp(u"Verify me");
		EXPECT_EQ(9U, tmp.size());
		}

		TEST(String16Test, StaticStringSetTo) {
		StaticString16 tmp(u"Verify me");
		tmp.setTo(u"New content");
		EXPECT_EQ(11U, tmp.size());
		EXPECT_STR16EQ(u"New content", tmp);
		EXPECT_FALSE(tmp.isStaticString());
		}

		TEST(String16Test, StaticStringAppend) {
		StaticString16 tmp(u"Verify me");
		tmp.append(String16("Hello"));
		EXPECT_EQ(14U, tmp.size());
		EXPECT_STR16EQ(u"Verify meHello", tmp);
		EXPECT_FALSE(tmp.isStaticString());
		}

		TEST(String16Test, StaticStringInsert) {
		StaticString16 tmp(u"Verify me");
		tmp.insert(6, u"Insert");
		EXPECT_EQ(15U, tmp.size());
		EXPECT_STR16EQ(u"VerifyInsert me", tmp);
		EXPECT_FALSE(tmp.isStaticString());
		}

		TEST(String16Test, StaticStringRemove) {
		StaticString16 tmp(u"Verify me");
		tmp.remove(2, 6);
		EXPECT_EQ(2U, tmp.size());
		EXPECT_STR16EQ(u" m", tmp);
		EXPECT_FALSE(tmp.isStaticString());
		}

		TEST(String16Test, StaticStringMakeLower) {
		StaticString16 tmp(u"Verify me!");
		tmp.makeLower();
		EXPECT_EQ(10U, tmp.size());
		EXPECT_STR16EQ(u"verify me!", tmp);
		EXPECT_FALSE(tmp.isStaticString());
		}

		TEST(String16Test, StaticStringReplaceAll) {
		StaticString16 tmp(u"Verify verify Verify");
		tmp.replaceAll(u'r', u'!');
		EXPECT_STR16EQ(u"Ve!ify ve!ify Ve!ify", tmp);
		EXPECT_FALSE(tmp.isStaticString());
		}

		TEST(String16Test, StaticStringCompare) {
		StaticString16 tmp(u"Verify me");
		EXPECT_EQ(String16(u"Verify me"), tmp);
		}

		TEST(String16Test, StringSetToStaticString) {
		StaticString16 tmp(u"Verify me");
		String16 another(u"nonstatic");
		another = tmp;
		EXPECT_STR16EQ(u"Verify me", tmp);
		EXPECT_STR16EQ(u"Verify me", another);
		}

		TEST(String16Test, StringMoveFromStaticString) {
		StaticString16 tmp(u"Verify me");
		String16 another(std::move(tmp));
		EXPECT_STR16EQ(u"Verify me", another);
		}

		TEST(String16Test, EmptyStringIsStatic) {
		String16 tmp("");
		EXPECT_TRUE(tmp.isStaticString());
		}

		} // namespace android