1.1 --- a/src/share/vm/prims/jvmtiImpl.cpp Mon Mar 02 14:03:03 2009 -0700 1.2 +++ b/src/share/vm/prims/jvmtiImpl.cpp Mon Mar 02 14:05:07 2009 -0700 1.3 @@ -238,6 +238,35 @@ 1.4 } 1.5 1.6 1.7 +bool 1.8 +JvmtiRawMonitor::is_valid() { 1.9 + int value = 0; 1.10 + 1.11 + // This object might not be a JvmtiRawMonitor so we can't assume 1.12 + // the _magic field is properly aligned. Get the value in a safe 1.13 + // way and then check against JVMTI_RM_MAGIC. 1.14 + 1.15 + switch (sizeof(_magic)) { 1.16 + case 2: 1.17 + value = Bytes::get_native_u2((address)&_magic); 1.18 + break; 1.19 + 1.20 + case 4: 1.21 + value = Bytes::get_native_u4((address)&_magic); 1.22 + break; 1.23 + 1.24 + case 8: 1.25 + value = Bytes::get_native_u8((address)&_magic); 1.26 + break; 1.27 + 1.28 + default: 1.29 + guarantee(false, "_magic field is an unexpected size"); 1.30 + } 1.31 + 1.32 + return value == JVMTI_RM_MAGIC; 1.33 +} 1.34 + 1.35 + 1.36 // 1.37 // class JvmtiBreakpoint 1.38 //