runtime/mirror/string.cc - platform/art - Gitiles

 /*
  * 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
	/*
	* 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