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comparison src/os/solaris/vm/os_solaris.cpp @ 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 850fdf70db2b
comparison
equal deleted inserted replaced
235:9c2ecc2ffb12 237:1fdb98a17101
2963 "addr must be page aligned"); 2963 "addr must be page aligned");
2964 int retVal = mprotect(addr, bytes, prot); 2964 int retVal = mprotect(addr, bytes, prot);
2965 return retVal == 0; 2965 return retVal == 0;
2966 } 2966 }
2967 2967
2968 // Protect memory (make it read-only. (Used to pass readonly pages through 2968 // Protect memory (Used to pass readonly pages through
2969 // JNI GetArray<type>Elements with empty arrays.) 2969 // JNI GetArray<type>Elements with empty arrays.)
2970 bool os::protect_memory(char* addr, size_t bytes) { 2970 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
2971 return solaris_mprotect(addr, bytes, PROT_READ); 2971 bool is_committed) {
2972 unsigned int p = 0;
2973 switch (prot) {
2974 case MEM_PROT_NONE: p = PROT_NONE; break;
2975 case MEM_PROT_READ: p = PROT_READ; break;
2976 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2977 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2978 default:
2979 ShouldNotReachHere();
2980 }
2981 // is_committed is unused.
2982 return solaris_mprotect(addr, bytes, p);
2972 } 2983 }
2973 2984
2974 // guard_memory and unguard_memory only happens within stack guard pages. 2985 // guard_memory and unguard_memory only happens within stack guard pages.
2975 // Since ISM pertains only to the heap, guard and unguard memory should not 2986 // Since ISM pertains only to the heap, guard and unguard memory should not
2976 /// happen with an ISM region. 2987 /// happen with an ISM region.