Mercurial > hg > truffle
comparison src/share/vm/memory/genCollectedHeap.cpp @ 237:1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
Summary: allocate alignment-sized page(s) below java heap so that memory accesses at heap_base+1page give signal and cause an implicit null check
Reviewed-by: kvn, jmasa, phh, jcoomes
| author | coleenp |
|---|---|
| date | Sat, 19 Jul 2008 17:38:22 -0400 |
| parents | d1605aabd0a1 |
| children | 850fdf70db2b |
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| 235:9c2ecc2ffb12 | 237:1fdb98a17101 |
|---|---|
| 220 heap_address = NULL; // any address will do. | 220 heap_address = NULL; // any address will do. |
| 221 } | 221 } |
| 222 | 222 |
| 223 *_total_reserved = total_reserved; | 223 *_total_reserved = total_reserved; |
| 224 *_n_covered_regions = n_covered_regions; | 224 *_n_covered_regions = n_covered_regions; |
| 225 *heap_rs = ReservedSpace(total_reserved, alignment, | 225 *heap_rs = ReservedHeapSpace(total_reserved, alignment, |
| 226 UseLargePages, heap_address); | 226 UseLargePages, heap_address); |
| 227 | 227 |
| 228 return heap_address; | 228 return heap_address; |
| 229 } | 229 } |
| 230 | 230 |
| 231 | 231 |