1.1 --- a/src/share/vm/prims/jvmtiEnvBase.cpp Mon Mar 02 14:03:03 2009 -0700
1.2 +++ b/src/share/vm/prims/jvmtiEnvBase.cpp Mon Mar 02 14:05:07 2009 -0700
1.3 @@ -94,6 +94,35 @@
1.4 }
1.5
1.6
1.7 +bool
1.8 +JvmtiEnvBase::is_valid() {
1.9 + jint value = 0;
1.10 +
1.11 + // This object might not be a JvmtiEnvBase 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_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_MAGIC;
1.33 +}
1.34 +
1.35 +
1.36 JvmtiEnvBase::JvmtiEnvBase() : _env_event_enable() {
1.37 _env_local_storage = NULL;
1.38 _tag_map = NULL;
