183 #endif
184 };
185
186 // Analogous opaque struct for metadata allocated from
187 // metaspaces.
188 class MetaWord {
189 private:
190 char* i;
191 };
192
193 // HeapWordSize must be 2^LogHeapWordSize.
194 const int HeapWordSize = sizeof(HeapWord);
195 #ifdef _LP64
196 const int LogHeapWordSize = 3;
197 #else
198 const int LogHeapWordSize = 2;
199 #endif
200 const int HeapWordsPerLong = BytesPerLong / HeapWordSize;
201 const int LogHeapWordsPerLong = LogBytesPerLong - LogHeapWordSize;
202
203 // The larger HeapWordSize for 64bit requires larger heaps
204 // for the same application running in 64bit. See bug 4967770.
205 // The minimum alignment to a heap word size is done. Other
206 // parts of the memory system may require additional alignment
207 // and are responsible for those alignments.
208 #ifdef _LP64
209 #define ScaleForWordSize(x) align_down_((x) * 13 / 10, HeapWordSize)
210 #else
211 #define ScaleForWordSize(x) (x)
212 #endif
213
214 // The minimum number of native machine words necessary to contain "byte_size"
215 // bytes.
216 inline size_t heap_word_size(size_t byte_size) {
217 return (byte_size + (HeapWordSize-1)) >> LogHeapWordSize;
218 }
219
220 //-------------------------------------------
221 // Constant for jlong (standardized by C++11)
222
223 // Build a 64bit integer constant
224 #define CONST64(x) (x ## LL)
225 #define UCONST64(x) (x ## ULL)
226
227 const jlong min_jlong = CONST64(0x8000000000000000);
228 const jlong max_jlong = CONST64(0x7fffffffffffffff);
229
230 const size_t K = 1024;
231 const size_t M = K*K;
232 const size_t G = M*K;
233 const size_t HWperKB = K / sizeof(HeapWord);
478
479 // Machine dependent stuff
480
481 // The maximum size of the code cache. Can be overridden by targets.
482 #define CODE_CACHE_SIZE_LIMIT (2*G)
483 // Allow targets to reduce the default size of the code cache.
484 #define CODE_CACHE_DEFAULT_LIMIT CODE_CACHE_SIZE_LIMIT
485
486 #include CPU_HEADER(globalDefinitions)
487
488 // To assure the IRIW property on processors that are not multiple copy
489 // atomic, sync instructions must be issued between volatile reads to
490 // assure their ordering, instead of after volatile stores.
491 // (See "A Tutorial Introduction to the ARM and POWER Relaxed Memory Models"
492 // by Luc Maranget, Susmit Sarkar and Peter Sewell, INRIA/Cambridge)
493 #ifdef CPU_NOT_MULTIPLE_COPY_ATOMIC
494 const bool support_IRIW_for_not_multiple_copy_atomic_cpu = true;
495 #else
496 const bool support_IRIW_for_not_multiple_copy_atomic_cpu = false;
497 #endif
498
499 // The byte alignment to be used by Arena::Amalloc. See bugid 4169348.
500 // Note: this value must be a power of 2
501
502 #define ARENA_AMALLOC_ALIGNMENT (2*BytesPerWord)
503
504 // Signed variants of alignment helpers. There are two versions of each, a macro
505 // for use in places like enum definitions that require compile-time constant
506 // expressions and a function for all other places so as to get type checking.
507
508 // Using '(what) & ~align_mask(alignment)' to align 'what' down is broken when
509 // 'alignment' is an unsigned int and 'what' is a wider type. The & operation
510 // will widen the inverted mask, and not sign extend it, leading to a mask with
511 // zeros in the most significant bits. The use of align_mask_widened() solves
512 // this problem.
513 #define align_mask(alignment) ((alignment) - 1)
514 #define widen_to_type_of(what, type_carrier) (true ? (what) : (type_carrier))
515 #define align_mask_widened(alignment, type_carrier) widen_to_type_of(align_mask(alignment), (type_carrier))
516
517 #define align_down_(size, alignment) ((size) & ~align_mask_widened((alignment), (size)))
518
519 #define align_up_(size, alignment) (align_down_((size) + align_mask(alignment), (alignment)))
520
521 #define is_aligned_(size, alignment) ((size) == (align_up_((size), (alignment))))
522
523 // Temporary declaration until this file has been restructured.
524 template <typename T>
525 bool is_power_of_2_t(T x) {
526 return (x != T(0)) && ((x & (x - 1)) == T(0));
527 }
528
529 // Helpers to align sizes and check for alignment
530
531 template <typename T, typename A>
532 inline T align_up(T size, A alignment) {
533 assert(is_power_of_2_t(alignment), "must be a power of 2: " UINT64_FORMAT, (uint64_t)alignment);
534
535 T ret = align_up_(size, alignment);
536 assert(is_aligned_(ret, alignment), "must be aligned: " UINT64_FORMAT, (uint64_t)ret);
537
538 return ret;
539 }
540
541 template <typename T, typename A>
542 inline T align_down(T size, A alignment) {
543 assert(is_power_of_2_t(alignment), "must be a power of 2: " UINT64_FORMAT, (uint64_t)alignment);
544
545 T ret = align_down_(size, alignment);
546 assert(is_aligned_(ret, alignment), "must be aligned: " UINT64_FORMAT, (uint64_t)ret);
547
548 return ret;
549 }
550
551 template <typename T, typename A>
552 inline bool is_aligned(T size, A alignment) {
553 assert(is_power_of_2_t(alignment), "must be a power of 2: " UINT64_FORMAT, (uint64_t)alignment);
554
555 return is_aligned_(size, alignment);
556 }
557
558 // Align down with a lower bound. If the aligning results in 0, return 'alignment'.
559 template <typename T, typename A>
560 inline T align_down_bounded(T size, A alignment) {
561 A aligned_size = align_down(size, alignment);
562 return aligned_size > 0 ? aligned_size : alignment;
563 }
564
565 // Helpers to align pointers and check for alignment.
566
567 template <typename T, typename A>
568 inline T* align_up(T* ptr, A alignment) {
569 return (T*)align_up((uintptr_t)ptr, alignment);
570 }
571
572 template <typename T, typename A>
573 inline T* align_down(T* ptr, A alignment) {
574 return (T*)align_down((uintptr_t)ptr, alignment);
575 }
576
577 template <typename T, typename A>
578 inline bool is_aligned(T* ptr, A alignment) {
579 return is_aligned((uintptr_t)ptr, alignment);
580 }
581
582 // Align metaspace objects by rounding up to natural word boundary
583 template <typename T>
584 inline T align_metadata_size(T size) {
585 return align_up(size, 1);
586 }
587
588 // Align objects in the Java Heap by rounding up their size, in HeapWord units.
589 template <typename T>
590 inline T align_object_size(T word_size) {
591 return align_up(word_size, MinObjAlignment);
592 }
593
594 inline bool is_object_aligned(size_t word_size) {
595 return is_aligned(word_size, MinObjAlignment);
596 }
597
598 inline bool is_object_aligned(const void* addr) {
599 return is_aligned(addr, MinObjAlignmentInBytes);
600 }
601
602 // Pad out certain offsets to jlong alignment, in HeapWord units.
603 template <typename T>
604 inline T align_object_offset(T offset) {
605 return align_up(offset, HeapWordsPerLong);
606 }
607
608 // Clamp an address to be within a specific page
609 // 1. If addr is on the page it is returned as is
610 // 2. If addr is above the page_address the start of the *next* page will be returned
611 // 3. Otherwise, if addr is below the page_address the start of the page will be returned
612 template <typename T>
613 inline T* clamp_address_in_page(T* addr, T* page_address, size_t page_size) {
614 if (align_down(addr, page_size) == align_down(page_address, page_size)) {
615 // address is in the specified page, just return it as is
616 return addr;
617 } else if (addr > page_address) {
618 // address is above specified page, return start of next page
619 return align_down(page_address, page_size) + page_size;
620 } else {
621 // address is below specified page, return start of page
622 return align_down(page_address, page_size);
623 }
624 }
625
626
627 // The expected size in bytes of a cache line, used to pad data structures.
628 #ifndef DEFAULT_CACHE_LINE_SIZE
629 #define DEFAULT_CACHE_LINE_SIZE 64
630 #endif
631
632
633 //----------------------------------------------------------------------------------------------------
634 // Utility macros for compilers
635 // used to silence compiler warnings
636
637 #define Unused_Variable(var) var
638
639
640 //----------------------------------------------------------------------------------------------------
641 // Miscellaneous
642
643 // 6302670 Eliminate Hotspot __fabsf dependency
644 // All fabs() callers should call this function instead, which will implicitly
645 // convert the operand to double, avoiding a dependency on __fabsf which
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183 #endif
184 };
185
186 // Analogous opaque struct for metadata allocated from
187 // metaspaces.
188 class MetaWord {
189 private:
190 char* i;
191 };
192
193 // HeapWordSize must be 2^LogHeapWordSize.
194 const int HeapWordSize = sizeof(HeapWord);
195 #ifdef _LP64
196 const int LogHeapWordSize = 3;
197 #else
198 const int LogHeapWordSize = 2;
199 #endif
200 const int HeapWordsPerLong = BytesPerLong / HeapWordSize;
201 const int LogHeapWordsPerLong = LogBytesPerLong - LogHeapWordSize;
202
203 // The minimum number of native machine words necessary to contain "byte_size"
204 // bytes.
205 inline size_t heap_word_size(size_t byte_size) {
206 return (byte_size + (HeapWordSize-1)) >> LogHeapWordSize;
207 }
208
209 //-------------------------------------------
210 // Constant for jlong (standardized by C++11)
211
212 // Build a 64bit integer constant
213 #define CONST64(x) (x ## LL)
214 #define UCONST64(x) (x ## ULL)
215
216 const jlong min_jlong = CONST64(0x8000000000000000);
217 const jlong max_jlong = CONST64(0x7fffffffffffffff);
218
219 const size_t K = 1024;
220 const size_t M = K*K;
221 const size_t G = M*K;
222 const size_t HWperKB = K / sizeof(HeapWord);
467
468 // Machine dependent stuff
469
470 // The maximum size of the code cache. Can be overridden by targets.
471 #define CODE_CACHE_SIZE_LIMIT (2*G)
472 // Allow targets to reduce the default size of the code cache.
473 #define CODE_CACHE_DEFAULT_LIMIT CODE_CACHE_SIZE_LIMIT
474
475 #include CPU_HEADER(globalDefinitions)
476
477 // To assure the IRIW property on processors that are not multiple copy
478 // atomic, sync instructions must be issued between volatile reads to
479 // assure their ordering, instead of after volatile stores.
480 // (See "A Tutorial Introduction to the ARM and POWER Relaxed Memory Models"
481 // by Luc Maranget, Susmit Sarkar and Peter Sewell, INRIA/Cambridge)
482 #ifdef CPU_NOT_MULTIPLE_COPY_ATOMIC
483 const bool support_IRIW_for_not_multiple_copy_atomic_cpu = true;
484 #else
485 const bool support_IRIW_for_not_multiple_copy_atomic_cpu = false;
486 #endif
487
488 // The expected size in bytes of a cache line, used to pad data structures.
489 #ifndef DEFAULT_CACHE_LINE_SIZE
490 #define DEFAULT_CACHE_LINE_SIZE 64
491 #endif
492
493
494 //----------------------------------------------------------------------------------------------------
495 // Utility macros for compilers
496 // used to silence compiler warnings
497
498 #define Unused_Variable(var) var
499
500
501 //----------------------------------------------------------------------------------------------------
502 // Miscellaneous
503
504 // 6302670 Eliminate Hotspot __fabsf dependency
505 // All fabs() callers should call this function instead, which will implicitly
506 // convert the operand to double, avoiding a dependency on __fabsf which
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