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Issue 2549773002: Internalize strings in-place (Closed)
Patch Set: forgot one Created 4 years ago
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1 // Copyright 2012 the V8 project authors. All rights reserved. 1 // Copyright 2012 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 /** \mainpage V8 API Reference Guide 5 /** \mainpage V8 API Reference Guide
6 * 6 *
7 * V8 is Google's open source JavaScript engine. 7 * V8 is Google's open source JavaScript engine.
8 * 8 *
9 * This set of documents provides reference material generated from the 9 * This set of documents provides reference material generated from the
10 * V8 header file, include/v8.h. 10 * V8 header file, include/v8.h.
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2281 /** 2281 /**
2282 * A JavaScript string value (ECMA-262, 4.3.17). 2282 * A JavaScript string value (ECMA-262, 4.3.17).
2283 */ 2283 */
2284 class V8_EXPORT String : public Name { 2284 class V8_EXPORT String : public Name {
2285 public: 2285 public:
2286 static const int kMaxLength = (1 << 28) - 16; 2286 static const int kMaxLength = (1 << 28) - 16;
2287 2287
2288 enum Encoding { 2288 enum Encoding {
2289 UNKNOWN_ENCODING = 0x1, 2289 UNKNOWN_ENCODING = 0x1,
2290 TWO_BYTE_ENCODING = 0x0, 2290 TWO_BYTE_ENCODING = 0x0,
2291 ONE_BYTE_ENCODING = 0x4 2291 ONE_BYTE_ENCODING = 0x8
2292 }; 2292 };
2293 /** 2293 /**
2294 * Returns the number of characters in this string. 2294 * Returns the number of characters in this string.
2295 */ 2295 */
2296 int Length() const; 2296 int Length() const;
2297 2297
2298 /** 2298 /**
2299 * Returns the number of bytes in the UTF-8 encoded 2299 * Returns the number of bytes in the UTF-8 encoded
2300 * representation of this string. 2300 * representation of this string.
2301 */ 2301 */
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8345 static const int kMapInstanceTypeAndBitFieldOffset = 8345 static const int kMapInstanceTypeAndBitFieldOffset =
8346 1 * kApiPointerSize + kApiIntSize; 8346 1 * kApiPointerSize + kApiIntSize;
8347 static const int kStringResourceOffset = 3 * kApiPointerSize; 8347 static const int kStringResourceOffset = 3 * kApiPointerSize;
8348 8348
8349 static const int kOddballKindOffset = 4 * kApiPointerSize + sizeof(double); 8349 static const int kOddballKindOffset = 4 * kApiPointerSize + sizeof(double);
8350 static const int kForeignAddressOffset = kApiPointerSize; 8350 static const int kForeignAddressOffset = kApiPointerSize;
8351 static const int kJSObjectHeaderSize = 3 * kApiPointerSize; 8351 static const int kJSObjectHeaderSize = 3 * kApiPointerSize;
8352 static const int kFixedArrayHeaderSize = 2 * kApiPointerSize; 8352 static const int kFixedArrayHeaderSize = 2 * kApiPointerSize;
8353 static const int kContextHeaderSize = 2 * kApiPointerSize; 8353 static const int kContextHeaderSize = 2 * kApiPointerSize;
8354 static const int kContextEmbedderDataIndex = 5; 8354 static const int kContextEmbedderDataIndex = 5;
8355 static const int kFullStringRepresentationMask = 0x07; 8355 static const int kFullStringRepresentationMask = 0x0f;
8356 static const int kStringEncodingMask = 0x4; 8356 static const int kStringEncodingMask = 0x8;
8357 static const int kExternalTwoByteRepresentationTag = 0x02; 8357 static const int kExternalTwoByteRepresentationTag = 0x02;
8358 static const int kExternalOneByteRepresentationTag = 0x06; 8358 static const int kExternalOneByteRepresentationTag = 0x0a;
8359 8359
8360 static const int kIsolateEmbedderDataOffset = 0 * kApiPointerSize; 8360 static const int kIsolateEmbedderDataOffset = 0 * kApiPointerSize;
8361 static const int kExternalMemoryOffset = 4 * kApiPointerSize; 8361 static const int kExternalMemoryOffset = 4 * kApiPointerSize;
8362 static const int kExternalMemoryLimitOffset = 8362 static const int kExternalMemoryLimitOffset =
8363 kExternalMemoryOffset + kApiInt64Size; 8363 kExternalMemoryOffset + kApiInt64Size;
8364 static const int kIsolateRootsOffset = kExternalMemoryLimitOffset + 8364 static const int kIsolateRootsOffset = kExternalMemoryLimitOffset +
8365 kApiInt64Size + kApiInt64Size + 8365 kApiInt64Size + kApiInt64Size +
8366 kApiPointerSize + kApiPointerSize; 8366 kApiPointerSize + kApiPointerSize;
8367 static const int kUndefinedValueRootIndex = 4; 8367 static const int kUndefinedValueRootIndex = 4;
8368 static const int kTheHoleValueRootIndex = 5; 8368 static const int kTheHoleValueRootIndex = 5;
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9731 */ 9731 */
9732 9732
9733 9733
9734 } // namespace v8 9734 } // namespace v8
9735 9735
9736 9736
9737 #undef TYPE_CHECK 9737 #undef TYPE_CHECK
9738 9738
9739 9739
9740 #endif // INCLUDE_V8_H_ 9740 #endif // INCLUDE_V8_H_
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