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1 // Copyright 2006-2009 the V8 project authors. All rights reserved. | 1 // Copyright 2006-2009 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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207 | 207 |
208 // Desired alignment for maps. | 208 // Desired alignment for maps. |
209 #if V8_HOST_ARCH_64_BIT | 209 #if V8_HOST_ARCH_64_BIT |
210 const intptr_t kMapAlignmentBits = kObjectAlignmentBits; | 210 const intptr_t kMapAlignmentBits = kObjectAlignmentBits; |
211 #else | 211 #else |
212 const intptr_t kMapAlignmentBits = kObjectAlignmentBits + 3; | 212 const intptr_t kMapAlignmentBits = kObjectAlignmentBits + 3; |
213 #endif | 213 #endif |
214 const intptr_t kMapAlignment = (1 << kMapAlignmentBits); | 214 const intptr_t kMapAlignment = (1 << kMapAlignmentBits); |
215 const intptr_t kMapAlignmentMask = kMapAlignment - 1; | 215 const intptr_t kMapAlignmentMask = kMapAlignment - 1; |
216 | 216 |
217 // Desired alignment for generated code. | |
218 // Code entry points are aligned to 32 bytes (cache line size in some CPUs). | |
Vitaly Repeshko
2010/09/24 15:45:38
In most of the CPUs we deal with it's actually 64.
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219 const int kCodeAlignmentBits = 5; | |
220 const intptr_t kCodeAlignment = 1 << kCodeAlignmentBits; | |
221 const intptr_t kCodeAlignmentMask = kCodeAlignment - 1; | |
222 | |
217 // Tag information for Failure. | 223 // Tag information for Failure. |
218 const int kFailureTag = 3; | 224 const int kFailureTag = 3; |
219 const int kFailureTagSize = 2; | 225 const int kFailureTagSize = 2; |
220 const intptr_t kFailureTagMask = (1 << kFailureTagSize) - 1; | 226 const intptr_t kFailureTagMask = (1 << kFailureTagSize) - 1; |
221 | 227 |
222 | 228 |
223 const int kBitsPerByte = 8; | 229 const int kBitsPerByte = 8; |
224 const int kBitsPerByteLog2 = 3; | 230 const int kBitsPerByteLog2 = 3; |
225 const int kBitsPerPointer = kPointerSize * kBitsPerByte; | 231 const int kBitsPerPointer = kPointerSize * kBitsPerByte; |
226 const int kBitsPerInt = kIntSize * kBitsPerByte; | 232 const int kBitsPerInt = kIntSize * kBitsPerByte; |
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581 (((value) + kObjectAlignmentMask) & ~kObjectAlignmentMask) | 587 (((value) + kObjectAlignmentMask) & ~kObjectAlignmentMask) |
582 | 588 |
583 // POINTER_SIZE_ALIGN returns the value aligned as a pointer. | 589 // POINTER_SIZE_ALIGN returns the value aligned as a pointer. |
584 #define POINTER_SIZE_ALIGN(value) \ | 590 #define POINTER_SIZE_ALIGN(value) \ |
585 (((value) + kPointerAlignmentMask) & ~kPointerAlignmentMask) | 591 (((value) + kPointerAlignmentMask) & ~kPointerAlignmentMask) |
586 | 592 |
587 // MAP_POINTER_ALIGN returns the value aligned as a map pointer. | 593 // MAP_POINTER_ALIGN returns the value aligned as a map pointer. |
588 #define MAP_POINTER_ALIGN(value) \ | 594 #define MAP_POINTER_ALIGN(value) \ |
589 (((value) + kMapAlignmentMask) & ~kMapAlignmentMask) | 595 (((value) + kMapAlignmentMask) & ~kMapAlignmentMask) |
590 | 596 |
597 // CODE_POINTER_ALIGN returns the value aligned as a generated code segment. | |
598 #define CODE_POINTER_ALIGN(value) \ | |
599 (((value) + kCodeAlignmentMask) & ~kCodeAlignmentMask) | |
600 | |
591 // The expression OFFSET_OF(type, field) computes the byte-offset | 601 // The expression OFFSET_OF(type, field) computes the byte-offset |
592 // of the specified field relative to the containing type. This | 602 // of the specified field relative to the containing type. This |
593 // corresponds to 'offsetof' (in stddef.h), except that it doesn't | 603 // corresponds to 'offsetof' (in stddef.h), except that it doesn't |
594 // use 0 or NULL, which causes a problem with the compiler warnings | 604 // use 0 or NULL, which causes a problem with the compiler warnings |
595 // we have enabled (which is also why 'offsetof' doesn't seem to work). | 605 // we have enabled (which is also why 'offsetof' doesn't seem to work). |
596 // Here we simply use the non-zero value 4, which seems to work. | 606 // Here we simply use the non-zero value 4, which seems to work. |
597 #define OFFSET_OF(type, field) \ | 607 #define OFFSET_OF(type, field) \ |
598 (reinterpret_cast<intptr_t>(&(reinterpret_cast<type*>(4)->field)) - 4) | 608 (reinterpret_cast<intptr_t>(&(reinterpret_cast<type*>(4)->field)) - 4) |
599 | 609 |
600 | 610 |
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698 CMOV = 15, // x86 | 708 CMOV = 15, // x86 |
699 RDTSC = 4, // x86 | 709 RDTSC = 4, // x86 |
700 CPUID = 10, // x86 | 710 CPUID = 10, // x86 |
701 VFP3 = 1, // ARM | 711 VFP3 = 1, // ARM |
702 ARMv7 = 2, // ARM | 712 ARMv7 = 2, // ARM |
703 SAHF = 0}; // x86 | 713 SAHF = 0}; // x86 |
704 | 714 |
705 } } // namespace v8::internal | 715 } } // namespace v8::internal |
706 | 716 |
707 #endif // V8_GLOBALS_H_ | 717 #endif // V8_GLOBALS_H_ |
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