11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
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
|
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
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/flatArrayKlass.hpp"
32 #include "oops/inlineKlass.hpp"
33 #include "oops/instanceClassLoaderKlass.hpp"
34 #include "oops/instanceKlass.inline.hpp"
35 #include "oops/instanceMirrorKlass.hpp"
36 #include "oops/instanceRefKlass.hpp"
37 #include "oops/instanceStackChunkKlass.hpp"
38 #include "oops/methodCounters.hpp"
39 #include "oops/methodData.hpp"
40 #include "oops/trainingData.hpp"
41 #include "oops/objArrayKlass.hpp"
42 #include "oops/refArrayKlass.hpp"
43 #include "oops/typeArrayKlass.hpp"
44 #include "runtime/arguments.hpp"
45 #include "utilities/globalDefinitions.hpp"
46
47 // Objects of the Metadata types (such as Klass and ConstantPool) have C++ vtables.
48 // (In GCC this is the field <Type>::_vptr, i.e., first word in the object.)
49 //
50 // Addresses of the vtables and the methods may be different across JVM runs,
51 // if libjvm.so is dynamically loaded at a different base address.
52 //
53 // To ensure that the Metadata objects in the CDS archive always have the correct vtable:
54 //
55 // + at dump time: we redirect the _vptr to point to our own vtables inside
56 // the CDS image
57 // + at run time: we clone the actual contents of the vtables from libjvm.so
58 // into our own tables.
59
60 // Currently, the archive contains ONLY the following types of objects that have C++ vtables.
61 // NOTE: this table must be in-sync with sun.jvm.hotspot.memory.FileMapInfo::populateMetadataTypeArray().
62 #define CPP_VTABLE_TYPES_DO(f) \
63 f(ConstantPool) \
64 f(InstanceKlass) \
65 f(InstanceClassLoaderKlass) \
66 f(InstanceMirrorKlass) \
67 f(InstanceRefKlass) \
68 f(InstanceStackChunkKlass) \
69 f(Method) \
70 f(MethodData) \
71 f(MethodCounters) \
72 f(ObjArrayKlass) \
73 f(TypeArrayKlass) \
74 f(FlatArrayKlass) \
75 f(InlineKlass) \
76 f(RefArrayKlass) \
77 f(KlassTrainingData) \
78 f(MethodTrainingData) \
79 f(CompileTrainingData)
80
81 class CppVtableInfo {
82 intptr_t _vtable_size;
83 intptr_t _cloned_vtable[1]; // Pseudo flexible array member.
84 static size_t cloned_vtable_offset() { return offset_of(CppVtableInfo, _cloned_vtable); }
85 public:
86 int vtable_size() { return int(uintx(_vtable_size)); }
87 void set_vtable_size(int n) { _vtable_size = intptr_t(n); }
88 // Using _cloned_vtable[i] for i > 0 causes undefined behavior. We use address calculation instead.
89 intptr_t* cloned_vtable() { return (intptr_t*)((char*)this + cloned_vtable_offset()); }
90 void zero() { memset(cloned_vtable(), 0, sizeof(intptr_t) * vtable_size()); }
91 // Returns the address of the next CppVtableInfo that can be placed immediately after this CppVtableInfo
92 static size_t byte_size(int vtable_size) {
93 return cloned_vtable_offset() + (sizeof(intptr_t) * vtable_size);
94 }
95 };
96
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