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| 1 // Copyright 2010 The Go Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style | |
| 3 // license that can be found in the LICENSE file. | |
| 4 | |
| 5 // Go definitions of internal structures. Master is malloc.h | |
| 6 | |
| 7 package runtime | |
| 8 | |
| 9 import "unsafe" | |
| 10 | |
| 11 const ( | |
| 12 pageShift = 12 | |
| 13 pageSize = 1 << pageShift | |
| 14 pageMask = pageSize - 1 | |
| 15 ) | |
| 16 | |
| 17 type pageID uintptr | |
| 18 | |
| 19 const ( | |
| 20 numSizeClasses = 67 | |
| 21 maxSmallSize = 32 << 10 | |
| 22 fixAllocChunk = 128 << 10 | |
| 23 maxMCacheListLen = 256 | |
| 24 maxMCacheSize = 2 << 20 | |
| 25 maxMHeapList = 1 << 8 // 1 << (20 - pageShift) | |
| 26 heapAllocChunk = 1 << 20 | |
| 27 ) | |
| 28 | |
| 29 type mLink struct { | |
| 30 next *mLink | |
| 31 } | |
| 32 | |
| 33 type fixAlloc struct { | |
| 34 size uintptr | |
| 35 alloc func(uintptr) | |
| 36 first func(unsafe.Pointer, *byte) | |
| 37 arg unsafe.Pointer | |
| 38 list *mLink | |
| 39 chunk *byte | |
| 40 nchunk uint32 | |
| 41 inuse uintptr | |
| 42 sys uintptr | |
| 43 } | |
| 44 | |
| 45 | |
| 46 // MStats? used to be in extern.go | |
| 47 | |
| 48 type mCacheList struct { | |
| 49 list *mLink | |
| 50 nlist uint32 | |
| 51 nlistmin uint32 | |
| 52 } | |
| 53 | |
| 54 type mCache struct { | |
| 55 list [numSizeClasses]mCacheList | |
| 56 size uint64 | |
| 57 local_alloc int64 | |
| 58 local_objects int64 | |
| 59 next_sample int32 | |
| 60 } | |
| 61 | |
| 62 type mSpan struct { | |
| 63 next *mSpan | |
| 64 prev *mSpan | |
| 65 allnext *mSpan | |
| 66 start pageID | |
| 67 npages uintptr | |
| 68 freelist *mLink | |
| 69 ref uint32 | |
| 70 sizeclass uint32 | |
| 71 state uint32 | |
| 72 // union { | |
| 73 gcref *uint32 // sizeclass > 0 | |
| 74 // gcref0 uint32; // sizeclass == 0 | |
| 75 // } | |
| 76 } | |
| 77 | |
| 78 type mCentral struct { | |
| 79 lock | |
| 80 sizeclass int32 | |
| 81 nonempty mSpan | |
| 82 empty mSpan | |
| 83 nfree int32 | |
| 84 } | |
| 85 | |
| 86 type mHeap struct { | |
| 87 lock | |
| 88 free [maxMHeapList]mSpan | |
| 89 large mSpan | |
| 90 allspans *mSpan | |
| 91 map_ mHeapMap | |
| 92 min *byte | |
| 93 max *byte | |
| 94 closure_min *byte | |
| 95 closure_max *byte | |
| 96 | |
| 97 central [numSizeClasses]struct { | |
| 98 pad [64]byte | |
| 99 // union: mCentral | |
| 100 } | |
| 101 | |
| 102 spanalloc fixAlloc | |
| 103 cachealloc fixAlloc | |
| 104 } | |
| 105 | |
| 106 const ( | |
| 107 refFree = iota | |
| 108 refStack | |
| 109 refNone | |
| 110 refSome | |
| 111 refcountOverhead = 4 | |
| 112 refNoPointers = 0x80000000 | |
| 113 refHasFinalizer = 0x40000000 | |
| 114 refProfiled = 0x20000000 | |
| 115 refNoProfiling = 0x10000000 | |
| 116 refFlags = 0xFFFF0000 | |
| 117 ) | |
| 118 | |
| 119 const ( | |
| 120 mProf_None = iota | |
| 121 mProf_Sample | |
| 122 mProf_All | |
| 123 ) | |
| 124 | |
| 125 type finalizer struct { | |
| 126 next *finalizer | |
| 127 fn func(unsafe.Pointer) | |
| 128 arg unsafe.Pointer | |
| 129 nret int32 | |
| 130 } | |
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