15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "cds/archiveUtils.hpp"
26 #include "cds/archiveBuilder.hpp"
27 #include "cds/cdsConfig.hpp"
28 #include "cds/cppVtables.hpp"
29 #include "cds/metaspaceShared.hpp"
30 #include "logging/log.hpp"
31 #include "oops/instanceClassLoaderKlass.hpp"
32 #include "oops/instanceMirrorKlass.hpp"
33 #include "oops/instanceRefKlass.hpp"
34 #include "oops/instanceStackChunkKlass.hpp"
35 #include "oops/methodData.hpp"
36 #include "oops/objArrayKlass.hpp"
37 #include "oops/typeArrayKlass.hpp"
38 #include "runtime/arguments.hpp"
39 #include "utilities/globalDefinitions.hpp"
40
41 // Objects of the Metadata types (such as Klass and ConstantPool) have C++ vtables.
42 // (In GCC this is the field <Type>::_vptr, i.e., first word in the object.)
43 //
44 // Addresses of the vtables and the methods may be different across JVM runs,
45 // if libjvm.so is dynamically loaded at a different base address.
46 //
47 // To ensure that the Metadata objects in the CDS archive always have the correct vtable:
48 //
49 // + at dump time: we redirect the _vptr to point to our own vtables inside
50 // the CDS image
51 // + at run time: we clone the actual contents of the vtables from libjvm.so
52 // into our own tables.
53
54 // Currently, the archive contains ONLY the following types of objects that have C++ vtables.
55 #define CPP_VTABLE_TYPES_DO(f) \
56 f(ConstantPool) \
57 f(InstanceKlass) \
58 f(InstanceClassLoaderKlass) \
59 f(InstanceMirrorKlass) \
60 f(InstanceRefKlass) \
61 f(InstanceStackChunkKlass) \
62 f(Method) \
63 f(ObjArrayKlass) \
64 f(TypeArrayKlass)
65
66 class CppVtableInfo {
67 intptr_t _vtable_size;
68 intptr_t _cloned_vtable[1]; // Pseudo flexible array member.
69 static size_t cloned_vtable_offset() { return offset_of(CppVtableInfo, _cloned_vtable); }
70 public:
71 int vtable_size() { return int(uintx(_vtable_size)); }
72 void set_vtable_size(int n) { _vtable_size = intptr_t(n); }
73 // Using _cloned_vtable[i] for i > 0 causes undefined behavior. We use address calculation instead.
74 intptr_t* cloned_vtable() { return (intptr_t*)((char*)this + cloned_vtable_offset()); }
75 void zero() { memset(cloned_vtable(), 0, sizeof(intptr_t) * vtable_size()); }
76 // Returns the address of the next CppVtableInfo that can be placed immediately after this CppVtableInfo
77 static size_t byte_size(int vtable_size) {
78 return cloned_vtable_offset() + (sizeof(intptr_t) * vtable_size);
79 }
80 };
81
82 static inline intptr_t* vtable_of(const Metadata* m) {
83 return *((intptr_t**)m);
84 }
262 }
263
264 intptr_t* CppVtables::get_archived_vtable(MetaspaceObj::Type msotype, address obj) {
265 if (!_orig_cpp_vtptrs_inited) {
266 CPP_VTABLE_TYPES_DO(INIT_ORIG_CPP_VTPTRS);
267 _orig_cpp_vtptrs_inited = true;
268 }
269
270 assert(CDSConfig::is_dumping_archive(), "sanity");
271 int kind = -1;
272 switch (msotype) {
273 case MetaspaceObj::SymbolType:
274 case MetaspaceObj::TypeArrayU1Type:
275 case MetaspaceObj::TypeArrayU2Type:
276 case MetaspaceObj::TypeArrayU4Type:
277 case MetaspaceObj::TypeArrayU8Type:
278 case MetaspaceObj::TypeArrayOtherType:
279 case MetaspaceObj::ConstMethodType:
280 case MetaspaceObj::ConstantPoolCacheType:
281 case MetaspaceObj::AnnotationsType:
282 case MetaspaceObj::MethodCountersType:
283 case MetaspaceObj::RecordComponentType:
284 // These have no vtables.
285 break;
286 case MetaspaceObj::MethodDataType:
287 // We don't archive MethodData <-- should have been removed in removed_unsharable_info
288 ShouldNotReachHere();
289 break;
290 default:
291 for (kind = 0; kind < _num_cloned_vtable_kinds; kind ++) {
292 if (vtable_of((Metadata*)obj) == _orig_cpp_vtptrs[kind] ||
293 vtable_of((Metadata*)obj) == _archived_cpp_vtptrs[kind]) {
294 break;
295 }
296 }
297 if (kind >= _num_cloned_vtable_kinds) {
298 fatal("Cannot find C++ vtable for " INTPTR_FORMAT " -- you probably added"
299 " a new subtype of Klass or MetaData without updating CPP_VTABLE_TYPES_DO or the cases in this 'switch' statement",
300 p2i(obj));
301 }
302 }
303
304 if (kind >= 0) {
305 assert(kind < _num_cloned_vtable_kinds, "must be");
306 return _index[kind]->cloned_vtable();
307 } else {
308 return nullptr;
309 }
|
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "cds/archiveUtils.hpp"
26 #include "cds/archiveBuilder.hpp"
27 #include "cds/cdsConfig.hpp"
28 #include "cds/cppVtables.hpp"
29 #include "cds/metaspaceShared.hpp"
30 #include "logging/log.hpp"
31 #include "oops/instanceClassLoaderKlass.hpp"
32 #include "oops/instanceMirrorKlass.hpp"
33 #include "oops/instanceRefKlass.hpp"
34 #include "oops/instanceStackChunkKlass.hpp"
35 #include "oops/methodCounters.hpp"
36 #include "oops/methodData.hpp"
37 #include "oops/trainingData.hpp"
38 #include "oops/objArrayKlass.hpp"
39 #include "oops/typeArrayKlass.hpp"
40 #include "runtime/arguments.hpp"
41 #include "utilities/globalDefinitions.hpp"
42
43 // Objects of the Metadata types (such as Klass and ConstantPool) have C++ vtables.
44 // (In GCC this is the field <Type>::_vptr, i.e., first word in the object.)
45 //
46 // Addresses of the vtables and the methods may be different across JVM runs,
47 // if libjvm.so is dynamically loaded at a different base address.
48 //
49 // To ensure that the Metadata objects in the CDS archive always have the correct vtable:
50 //
51 // + at dump time: we redirect the _vptr to point to our own vtables inside
52 // the CDS image
53 // + at run time: we clone the actual contents of the vtables from libjvm.so
54 // into our own tables.
55
56 // Currently, the archive contains ONLY the following types of objects that have C++ vtables.
57 #define CPP_VTABLE_TYPES_DO(f) \
58 f(ConstantPool) \
59 f(InstanceKlass) \
60 f(InstanceClassLoaderKlass) \
61 f(InstanceMirrorKlass) \
62 f(InstanceRefKlass) \
63 f(InstanceStackChunkKlass) \
64 f(Method) \
65 f(MethodData) \
66 f(MethodCounters) \
67 f(ObjArrayKlass) \
68 f(TypeArrayKlass) \
69 f(KlassTrainingData) \
70 f(MethodTrainingData) \
71 f(CompileTrainingData)
72
73 class CppVtableInfo {
74 intptr_t _vtable_size;
75 intptr_t _cloned_vtable[1]; // Pseudo flexible array member.
76 static size_t cloned_vtable_offset() { return offset_of(CppVtableInfo, _cloned_vtable); }
77 public:
78 int vtable_size() { return int(uintx(_vtable_size)); }
79 void set_vtable_size(int n) { _vtable_size = intptr_t(n); }
80 // Using _cloned_vtable[i] for i > 0 causes undefined behavior. We use address calculation instead.
81 intptr_t* cloned_vtable() { return (intptr_t*)((char*)this + cloned_vtable_offset()); }
82 void zero() { memset(cloned_vtable(), 0, sizeof(intptr_t) * vtable_size()); }
83 // Returns the address of the next CppVtableInfo that can be placed immediately after this CppVtableInfo
84 static size_t byte_size(int vtable_size) {
85 return cloned_vtable_offset() + (sizeof(intptr_t) * vtable_size);
86 }
87 };
88
89 static inline intptr_t* vtable_of(const Metadata* m) {
90 return *((intptr_t**)m);
91 }
269 }
270
271 intptr_t* CppVtables::get_archived_vtable(MetaspaceObj::Type msotype, address obj) {
272 if (!_orig_cpp_vtptrs_inited) {
273 CPP_VTABLE_TYPES_DO(INIT_ORIG_CPP_VTPTRS);
274 _orig_cpp_vtptrs_inited = true;
275 }
276
277 assert(CDSConfig::is_dumping_archive(), "sanity");
278 int kind = -1;
279 switch (msotype) {
280 case MetaspaceObj::SymbolType:
281 case MetaspaceObj::TypeArrayU1Type:
282 case MetaspaceObj::TypeArrayU2Type:
283 case MetaspaceObj::TypeArrayU4Type:
284 case MetaspaceObj::TypeArrayU8Type:
285 case MetaspaceObj::TypeArrayOtherType:
286 case MetaspaceObj::ConstMethodType:
287 case MetaspaceObj::ConstantPoolCacheType:
288 case MetaspaceObj::AnnotationsType:
289 case MetaspaceObj::RecordComponentType:
290 case MetaspaceObj::AdapterHandlerEntryType:
291 case MetaspaceObj::AdapterFingerPrintType:
292 // These have no vtables.
293 break;
294 default:
295 for (kind = 0; kind < _num_cloned_vtable_kinds; kind ++) {
296 if (vtable_of((Metadata*)obj) == _orig_cpp_vtptrs[kind] ||
297 vtable_of((Metadata*)obj) == _archived_cpp_vtptrs[kind]) {
298 break;
299 }
300 }
301 if (kind >= _num_cloned_vtable_kinds) {
302 fatal("Cannot find C++ vtable for " INTPTR_FORMAT " -- you probably added"
303 " a new subtype of Klass or MetaData without updating CPP_VTABLE_TYPES_DO or the cases in this 'switch' statement",
304 p2i(obj));
305 }
306 }
307
308 if (kind >= 0) {
309 assert(kind < _num_cloned_vtable_kinds, "must be");
310 return _index[kind]->cloned_vtable();
311 } else {
312 return nullptr;
313 }
|