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Issue 110183003: Increase number of available major keys. (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: Created 7 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 // Redistribution and use in source and binary forms, with or without 2 // Redistribution and use in source and binary forms, with or without
3 // modification, are permitted provided that the following conditions are 3 // modification, are permitted provided that the following conditions are
4 // met: 4 // met:
5 // 5 //
6 // * Redistributions of source code must retain the above copyright 6 // * Redistributions of source code must retain the above copyright
7 // notice, this list of conditions and the following disclaimer. 7 // notice, this list of conditions and the following disclaimer.
8 // * Redistributions in binary form must reproduce the above 8 // * Redistributions in binary form must reproduce the above
9 // copyright notice, this list of conditions and the following 9 // copyright notice, this list of conditions and the following
10 // disclaimer in the documentation and/or other materials provided 10 // disclaimer in the documentation and/or other materials provided
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304 }; 304 };
305 305
306 // ICs store extra state in a Code object. The default extra state is 306 // ICs store extra state in a Code object. The default extra state is
307 // kNoExtraICState. 307 // kNoExtraICState.
308 typedef int ExtraICState; 308 typedef int ExtraICState;
309 static const ExtraICState kNoExtraICState = 0; 309 static const ExtraICState kNoExtraICState = 0;
310 310
311 // Instance size sentinel for objects of variable size. 311 // Instance size sentinel for objects of variable size.
312 const int kVariableSizeSentinel = 0; 312 const int kVariableSizeSentinel = 0;
313 313
314 const int kStubMajorKeyBits = 6; 314 const int kStubMajorKeyBits = 7;
315 const int kStubMinorKeyBits = kBitsPerInt - kSmiTagSize - kStubMajorKeyBits; 315 const int kStubMinorKeyBits = kBitsPerInt - kSmiTagSize - kStubMajorKeyBits;
316 316
317 // All Maps have a field instance_type containing a InstanceType. 317 // All Maps have a field instance_type containing a InstanceType.
318 // It describes the type of the instances. 318 // It describes the type of the instances.
319 // 319 //
320 // As an example, a JavaScript object is a heap object and its map 320 // As an example, a JavaScript object is a heap object and its map
321 // instance_type is JS_OBJECT_TYPE. 321 // instance_type is JS_OBJECT_TYPE.
322 // 322 //
323 // The names of the string instance types are intended to systematically 323 // The names of the string instance types are intended to systematically
324 // mirror their encoding in the instance_type field of the map. The default 324 // mirror their encoding in the instance_type field of the map. The default
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5477 5477
5478 // KindSpecificFlags2 layout (ALL) 5478 // KindSpecificFlags2 layout (ALL)
5479 static const int kIsCrankshaftedBit = 0; 5479 static const int kIsCrankshaftedBit = 0;
5480 class IsCrankshaftedField: public BitField<bool, 5480 class IsCrankshaftedField: public BitField<bool,
5481 kIsCrankshaftedBit, 1> {}; // NOLINT 5481 kIsCrankshaftedBit, 1> {}; // NOLINT
5482 5482
5483 // KindSpecificFlags2 layout (STUB and OPTIMIZED_FUNCTION) 5483 // KindSpecificFlags2 layout (STUB and OPTIMIZED_FUNCTION)
5484 static const int kStubMajorKeyFirstBit = kIsCrankshaftedBit + 1; 5484 static const int kStubMajorKeyFirstBit = kIsCrankshaftedBit + 1;
5485 static const int kSafepointTableOffsetFirstBit = 5485 static const int kSafepointTableOffsetFirstBit =
5486 kStubMajorKeyFirstBit + kStubMajorKeyBits; 5486 kStubMajorKeyFirstBit + kStubMajorKeyBits;
5487 static const int kSafepointTableOffsetBitCount = 25; 5487 static const int kSafepointTableOffsetBitCount = 24;
5488 5488
5489 STATIC_ASSERT(kStubMajorKeyFirstBit + kStubMajorKeyBits <= 32); 5489 STATIC_ASSERT(kStubMajorKeyFirstBit + kStubMajorKeyBits <= 32);
5490 STATIC_ASSERT(kSafepointTableOffsetFirstBit + 5490 STATIC_ASSERT(kSafepointTableOffsetFirstBit +
5491 kSafepointTableOffsetBitCount <= 32); 5491 kSafepointTableOffsetBitCount <= 32);
5492 STATIC_ASSERT(1 + kStubMajorKeyBits + 5492 STATIC_ASSERT(1 + kStubMajorKeyBits +
5493 kSafepointTableOffsetBitCount <= 32); 5493 kSafepointTableOffsetBitCount <= 32);
5494 5494
5495 class SafepointTableOffsetField: public BitField<int, 5495 class SafepointTableOffsetField: public BitField<int,
5496 kSafepointTableOffsetFirstBit, 5496 kSafepointTableOffsetFirstBit,
5497 kSafepointTableOffsetBitCount> {}; // NOLINT 5497 kSafepointTableOffsetBitCount> {}; // NOLINT
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10606 } else { 10606 } else {
10607 value &= ~(1 << bit_position); 10607 value &= ~(1 << bit_position);
10608 } 10608 }
10609 return value; 10609 return value;
10610 } 10610 }
10611 }; 10611 };
10612 10612
10613 } } // namespace v8::internal 10613 } } // namespace v8::internal
10614 10614
10615 #endif // V8_OBJECTS_H_ 10615 #endif // V8_OBJECTS_H_
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