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comparison src/share/vm/runtime/deoptimization.cpp @ 17620:69dc1be43fce

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8029873: compiler/uncommontrap/TestStackBangRbp.java crashes with SIGSEGV Summary: May end up in uncommon trap blob/deopt blob with unguarded stack Reviewed-by: kvn, twisti
author roland
date Wed, 08 Jan 2014 09:49:31 +0100
parents 190899198332
children 63a4eb8bcd23 abec000618bf b8413a9cbb84
comparison
equal deleted inserted replaced
17619:5231c2210388 17620:69dc1be43fce
1222 void Deoptimization::load_class_by_index(constantPoolHandle constant_pool, int index) { 1222 void Deoptimization::load_class_by_index(constantPoolHandle constant_pool, int index) {
1223 EXCEPTION_MARK; 1223 EXCEPTION_MARK;
1224 load_class_by_index(constant_pool, index, THREAD); 1224 load_class_by_index(constant_pool, index, THREAD);
1225 if (HAS_PENDING_EXCEPTION) { 1225 if (HAS_PENDING_EXCEPTION) {
1226 // Exception happened during classloading. We ignore the exception here, since it 1226 // Exception happened during classloading. We ignore the exception here, since it
1227 // is going to be rethrown since the current activation is going to be deoptimzied and 1227 // is going to be rethrown since the current activation is going to be deoptimized and
1228 // the interpreter will re-execute the bytecode. 1228 // the interpreter will re-execute the bytecode.
1229 CLEAR_PENDING_EXCEPTION; 1229 CLEAR_PENDING_EXCEPTION;
1230 // Class loading called java code which may have caused a stack
1231 // overflow. If the exception was thrown right before the return
1232 // to the runtime the stack is no longer guarded. Reguard the
1233 // stack otherwise if we return to the uncommon trap blob and the
1234 // stack bang causes a stack overflow we crash.
1235 assert(THREAD->is_Java_thread(), "only a java thread can be here");
1236 JavaThread* thread = (JavaThread*)THREAD;
1237 bool guard_pages_enabled = thread->stack_yellow_zone_enabled();
1238 if (!guard_pages_enabled) guard_pages_enabled = thread->reguard_stack();
1239 assert(guard_pages_enabled, "stack banging in uncommon trap blob may cause crash");
1230 } 1240 }
1231 } 1241 }
1232 1242
1233 JRT_ENTRY(void, Deoptimization::uncommon_trap_inner(JavaThread* thread, jint trap_request)) { 1243 JRT_ENTRY(void, Deoptimization::uncommon_trap_inner(JavaThread* thread, jint trap_request)) {
1234 HandleMark hm; 1244 HandleMark hm;