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comparison src/share/vm/prims/unsafe.cpp @ 3252:92add02409c9

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Merge
author jmasa
date Fri, 08 Apr 2011 14:19:50 -0700
parents 38fea01eb669 e1162778c1c8
children 19241ae0d839
comparison
equal deleted inserted replaced
2437:4f978fb6c81a 3252:92add02409c9
22 * 22 *
23 */ 23 */
24 24
25 #include "precompiled.hpp" 25 #include "precompiled.hpp"
26 #include "classfile/vmSymbols.hpp" 26 #include "classfile/vmSymbols.hpp"
27 #ifndef SERIALGC
28 #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp"
29 #endif // SERIALGC
27 #include "memory/allocation.inline.hpp" 30 #include "memory/allocation.inline.hpp"
28 #include "prims/jni.h" 31 #include "prims/jni.h"
29 #include "prims/jvm.h" 32 #include "prims/jvm.h"
30 #include "runtime/globals.hpp" 33 #include "runtime/globals.hpp"
31 #include "runtime/interfaceSupport.hpp" 34 #include "runtime/interfaceSupport.hpp"
191 // The xxx140 variants for backward compatibility do not allow a full-width offset. 194 // The xxx140 variants for backward compatibility do not allow a full-width offset.
192 UNSAFE_ENTRY(jobject, Unsafe_GetObject140(JNIEnv *env, jobject unsafe, jobject obj, jint offset)) 195 UNSAFE_ENTRY(jobject, Unsafe_GetObject140(JNIEnv *env, jobject unsafe, jobject obj, jint offset))
193 UnsafeWrapper("Unsafe_GetObject"); 196 UnsafeWrapper("Unsafe_GetObject");
194 if (obj == NULL) THROW_0(vmSymbols::java_lang_NullPointerException()); 197 if (obj == NULL) THROW_0(vmSymbols::java_lang_NullPointerException());
195 GET_OOP_FIELD(obj, offset, v) 198 GET_OOP_FIELD(obj, offset, v)
196 return JNIHandles::make_local(env, v); 199 jobject ret = JNIHandles::make_local(env, v);
200 #ifndef SERIALGC
201 // We could be accessing the referent field in a reference
202 // object. If G1 is enabled then we need to register a non-null
203 // referent with the SATB barrier.
204 if (UseG1GC) {
205 bool needs_barrier = false;
206
207 if (ret != NULL) {
208 if (offset == java_lang_ref_Reference::referent_offset) {
209 oop o = JNIHandles::resolve_non_null(obj);
210 klassOop k = o->klass();
211 if (instanceKlass::cast(k)->reference_type() != REF_NONE) {
212 assert(instanceKlass::cast(k)->is_subclass_of(SystemDictionary::Reference_klass()), "sanity");
213 needs_barrier = true;
214 }
215 }
216 }
217
218 if (needs_barrier) {
219 oop referent = JNIHandles::resolve(ret);
220 G1SATBCardTableModRefBS::enqueue(referent);
221 }
222 }
223 #endif // SERIALGC
224 return ret;
197 UNSAFE_END 225 UNSAFE_END
198 226
199 UNSAFE_ENTRY(void, Unsafe_SetObject140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jobject x_h)) 227 UNSAFE_ENTRY(void, Unsafe_SetObject140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jobject x_h))
200 UnsafeWrapper("Unsafe_SetObject"); 228 UnsafeWrapper("Unsafe_SetObject");
201 if (obj == NULL) THROW(vmSymbols::java_lang_NullPointerException()); 229 if (obj == NULL) THROW(vmSymbols::java_lang_NullPointerException());
224 // But if the base pointer is non-null, the offset should make some sense. 252 // But if the base pointer is non-null, the offset should make some sense.
225 // That is, it should be in the range [0, MAX_OBJECT_SIZE]. 253 // That is, it should be in the range [0, MAX_OBJECT_SIZE].
226 UNSAFE_ENTRY(jobject, Unsafe_GetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) 254 UNSAFE_ENTRY(jobject, Unsafe_GetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
227 UnsafeWrapper("Unsafe_GetObject"); 255 UnsafeWrapper("Unsafe_GetObject");
228 GET_OOP_FIELD(obj, offset, v) 256 GET_OOP_FIELD(obj, offset, v)
229 return JNIHandles::make_local(env, v); 257 jobject ret = JNIHandles::make_local(env, v);
258 #ifndef SERIALGC
259 // We could be accessing the referent field in a reference
260 // object. If G1 is enabled then we need to register non-null
261 // referent with the SATB barrier.
262 if (UseG1GC) {
263 bool needs_barrier = false;
264
265 if (ret != NULL) {
266 if (offset == java_lang_ref_Reference::referent_offset && obj != NULL) {
267 oop o = JNIHandles::resolve(obj);
268 klassOop k = o->klass();
269 if (instanceKlass::cast(k)->reference_type() != REF_NONE) {
270 assert(instanceKlass::cast(k)->is_subclass_of(SystemDictionary::Reference_klass()), "sanity");
271 needs_barrier = true;
272 }
273 }
274 }
275
276 if (needs_barrier) {
277 oop referent = JNIHandles::resolve(ret);
278 G1SATBCardTableModRefBS::enqueue(referent);
279 }
280 }
281 #endif // SERIALGC
282 return ret;
230 UNSAFE_END 283 UNSAFE_END
231 284
232 UNSAFE_ENTRY(void, Unsafe_SetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h)) 285 UNSAFE_ENTRY(void, Unsafe_SetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
233 UnsafeWrapper("Unsafe_SetObject"); 286 UnsafeWrapper("Unsafe_SetObject");
234 oop x = JNIHandles::resolve(x_h); 287 oop x = JNIHandles::resolve(x_h);