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| 1 // Copyright 2012 The Go Authors. All rights reserved. | 1 // Copyright 2012 The Go Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style | 2 // Use of this source code is governed by a BSD-style |
| 3 // license that can be found in the LICENSE file. | 3 // license that can be found in the LICENSE file. |
| 4 | 4 |
| 5 // Garbage collector (GC) | 5 // Garbage collector (GC) |
| 6 | 6 |
| 7 enum { | 7 enum { |
| 8 ScanStackByFrames = 1, | 8 ScanStackByFrames = 1, |
| 9 | 9 |
| 10 // TODO(rsc): Half the code in the garbage collector | 10 // TODO(rsc): Half the code in the garbage collector |
| (...skipping 65 matching lines...) Expand 10 before | Expand all | Expand 10 after Loading... |
| 76 // The bitmap starts at mheap.arena_start and extends *backward* from | 76 // The bitmap starts at mheap.arena_start and extends *backward* from |
| 77 // there. On a 64-bit system the off'th word in the arena is tracked by | 77 // there. On a 64-bit system the off'th word in the arena is tracked by |
| 78 // the off/16+1'th word before mheap.arena_start. (On a 32-bit system, | 78 // the off/16+1'th word before mheap.arena_start. (On a 32-bit system, |
| 79 // the only difference is that the divisor is 8.) | 79 // the only difference is that the divisor is 8.) |
| 80 | 80 |
| 81 #define bitBoundary ((uintptr)1) // boundary of an object | 81 #define bitBoundary ((uintptr)1) // boundary of an object |
| 82 #define bitMarked ((uintptr)2) // marked object | 82 #define bitMarked ((uintptr)2) // marked object |
| 83 | 83 |
| 84 #define bitMask ((uintptr)bitBoundary|bitMarked) | 84 #define bitMask ((uintptr)bitBoundary|bitMarked) |
| 85 #define bitPtrMask ((uintptr)BitsMask<<2) | 85 #define bitPtrMask ((uintptr)BitsMask<<2) |
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