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comparison src/share/vm/runtime/os.hpp @ 237:1fdb98a17101

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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 d95b224e9f17
comparison
equal deleted inserted replaced
235:9c2ecc2ffb12 237:1fdb98a17101
191 size_t split, bool realloc); 191 size_t split, bool realloc);
192 static bool commit_memory(char* addr, size_t bytes); 192 static bool commit_memory(char* addr, size_t bytes);
193 static bool commit_memory(char* addr, size_t size, size_t alignment_hint); 193 static bool commit_memory(char* addr, size_t size, size_t alignment_hint);
194 static bool uncommit_memory(char* addr, size_t bytes); 194 static bool uncommit_memory(char* addr, size_t bytes);
195 static bool release_memory(char* addr, size_t bytes); 195 static bool release_memory(char* addr, size_t bytes);
196 static bool protect_memory(char* addr, size_t bytes); 196
197 enum ProtType { MEM_PROT_NONE, MEM_PROT_READ, MEM_PROT_RW, MEM_PROT_RWX };
198 static bool protect_memory(char* addr, size_t bytes, ProtType prot,
199 bool is_committed = false);
200
197 static bool guard_memory(char* addr, size_t bytes); 201 static bool guard_memory(char* addr, size_t bytes);
198 static bool unguard_memory(char* addr, size_t bytes); 202 static bool unguard_memory(char* addr, size_t bytes);
199 static char* map_memory(int fd, const char* file_name, size_t file_offset, 203 static char* map_memory(int fd, const char* file_name, size_t file_offset,
200 char *addr, size_t bytes, bool read_only = false, 204 char *addr, size_t bytes, bool read_only = false,
201 bool allow_exec = false); 205 bool allow_exec = false);