316 log_info(redefine, class, timer)
317 ("vm_op: all=" JULONG_FORMAT " prologue=" JULONG_FORMAT " doit=" JULONG_FORMAT,
318 all_time, (julong)_timer_vm_op_prologue.milliseconds(), doit_time);
319 log_info(redefine, class, timer)
320 ("redefine_single_class: phase1=" JULONG_FORMAT " phase2=" JULONG_FORMAT,
321 (julong)_timer_rsc_phase1.milliseconds(), (julong)_timer_rsc_phase2.milliseconds());
322 }
323 }
324
325 bool VM_RedefineClasses::is_modifiable_class(oop klass_mirror) {
326 // classes for primitives cannot be redefined
327 if (java_lang_Class::is_primitive(klass_mirror)) {
328 return false;
329 }
330 Klass* k = java_lang_Class::as_Klass(klass_mirror);
331 // classes for arrays cannot be redefined
332 if (k == NULL || !k->is_instance_klass()) {
333 return false;
334 }
335
336 // Cannot redefine or retransform a hidden class.
337 if (InstanceKlass::cast(k)->is_hidden()) {
338 return false;
339 }
340 return true;
341 }
342
343 // Append the current entry at scratch_i in scratch_cp to *merge_cp_p
344 // where the end of *merge_cp_p is specified by *merge_cp_length_p. For
345 // direct CP entries, there is just the current entry to append. For
346 // indirect and double-indirect CP entries, there are zero or more
347 // referenced CP entries along with the current entry to append.
348 // Indirect and double-indirect CP entries are handled by recursive
349 // calls to append_entry() as needed. The referenced CP entries are
350 // always appended to *merge_cp_p before the referee CP entry. These
351 // referenced CP entries may already exist in *merge_cp_p in which case
352 // there is nothing extra to append and only the current entry is
353 // appended.
354 void VM_RedefineClasses::append_entry(const constantPoolHandle& scratch_cp,
355 int scratch_i, constantPoolHandle *merge_cp_p, int *merge_cp_length_p) {
581 if (scratch_i != *merge_cp_length_p) {
582 // The new entry in *merge_cp_p is at a different index than
583 // the new entry in scratch_cp so we need to map the index values.
584 map_index(scratch_cp, scratch_i, *merge_cp_length_p);
585 }
586 (*merge_cp_length_p)++;
587 } break;
588
589 // At this stage, Class or UnresolvedClass could be in scratch_cp, but not
590 // ClassIndex
591 case JVM_CONSTANT_ClassIndex: // fall through
592
593 // Invalid is used as the tag for the second constant pool entry
594 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
595 // not be seen by itself.
596 case JVM_CONSTANT_Invalid: // fall through
597
598 // At this stage, String could be here, but not StringIndex
599 case JVM_CONSTANT_StringIndex: // fall through
600
601 // At this stage JVM_CONSTANT_UnresolvedClassInError should not be
602 // here
603 case JVM_CONSTANT_UnresolvedClassInError: // fall through
604
605 default:
606 {
607 // leave a breadcrumb
608 jbyte bad_value = scratch_cp->tag_at(scratch_i).value();
609 ShouldNotReachHere();
610 } break;
611 } // end switch tag value
612 } // end append_entry()
613
614
615 int VM_RedefineClasses::find_or_append_indirect_entry(const constantPoolHandle& scratch_cp,
616 int ref_i, constantPoolHandle *merge_cp_p, int *merge_cp_length_p) {
617
618 int new_ref_i = ref_i;
619 bool match = (ref_i < *merge_cp_length_p) &&
620 scratch_cp->compare_entry_to(ref_i, *merge_cp_p, ref_i);
621
622 if (!match) {
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316 log_info(redefine, class, timer)
317 ("vm_op: all=" JULONG_FORMAT " prologue=" JULONG_FORMAT " doit=" JULONG_FORMAT,
318 all_time, (julong)_timer_vm_op_prologue.milliseconds(), doit_time);
319 log_info(redefine, class, timer)
320 ("redefine_single_class: phase1=" JULONG_FORMAT " phase2=" JULONG_FORMAT,
321 (julong)_timer_rsc_phase1.milliseconds(), (julong)_timer_rsc_phase2.milliseconds());
322 }
323 }
324
325 bool VM_RedefineClasses::is_modifiable_class(oop klass_mirror) {
326 // classes for primitives cannot be redefined
327 if (java_lang_Class::is_primitive(klass_mirror)) {
328 return false;
329 }
330 Klass* k = java_lang_Class::as_Klass(klass_mirror);
331 // classes for arrays cannot be redefined
332 if (k == NULL || !k->is_instance_klass()) {
333 return false;
334 }
335
336 // Cannot redefine or retransform interface java.lang.IdentityObject.
337 if (k->name() == vmSymbols::java_lang_IdentityObject()) {
338 return false;
339 }
340 // Cannot redefine or retransform interface java.lang.PrimitiveObject.
341 if (k->name() == vmSymbols::java_lang_PrimitiveObject()) {
342 return false;
343 }
344
345 // Cannot redefine or retransform a hidden class.
346 if (InstanceKlass::cast(k)->is_hidden()) {
347 return false;
348 }
349 return true;
350 }
351
352 // Append the current entry at scratch_i in scratch_cp to *merge_cp_p
353 // where the end of *merge_cp_p is specified by *merge_cp_length_p. For
354 // direct CP entries, there is just the current entry to append. For
355 // indirect and double-indirect CP entries, there are zero or more
356 // referenced CP entries along with the current entry to append.
357 // Indirect and double-indirect CP entries are handled by recursive
358 // calls to append_entry() as needed. The referenced CP entries are
359 // always appended to *merge_cp_p before the referee CP entry. These
360 // referenced CP entries may already exist in *merge_cp_p in which case
361 // there is nothing extra to append and only the current entry is
362 // appended.
363 void VM_RedefineClasses::append_entry(const constantPoolHandle& scratch_cp,
364 int scratch_i, constantPoolHandle *merge_cp_p, int *merge_cp_length_p) {
590 if (scratch_i != *merge_cp_length_p) {
591 // The new entry in *merge_cp_p is at a different index than
592 // the new entry in scratch_cp so we need to map the index values.
593 map_index(scratch_cp, scratch_i, *merge_cp_length_p);
594 }
595 (*merge_cp_length_p)++;
596 } break;
597
598 // At this stage, Class or UnresolvedClass could be in scratch_cp, but not
599 // ClassIndex
600 case JVM_CONSTANT_ClassIndex: // fall through
601
602 // Invalid is used as the tag for the second constant pool entry
603 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
604 // not be seen by itself.
605 case JVM_CONSTANT_Invalid: // fall through
606
607 // At this stage, String could be here, but not StringIndex
608 case JVM_CONSTANT_StringIndex: // fall through
609
610 // At this stage JVM_CONSTANT_UnresolvedClassInError should not be here
611 case JVM_CONSTANT_UnresolvedClassInError: // fall through
612
613 default:
614 {
615 // leave a breadcrumb
616 jbyte bad_value = scratch_cp->tag_at(scratch_i).value();
617 ShouldNotReachHere();
618 } break;
619 } // end switch tag value
620 } // end append_entry()
621
622
623 int VM_RedefineClasses::find_or_append_indirect_entry(const constantPoolHandle& scratch_cp,
624 int ref_i, constantPoolHandle *merge_cp_p, int *merge_cp_length_p) {
625
626 int new_ref_i = ref_i;
627 bool match = (ref_i < *merge_cp_length_p) &&
628 scratch_cp->compare_entry_to(ref_i, *merge_cp_p, ref_i);
629
630 if (!match) {
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