< prev index next > src/hotspot/share/gc/shenandoah/shenandoahAsserts.cpp
Print this page
void print_raw_memory(ShenandoahMessageBuffer &msg, void* loc) {
// Be extra safe. Only access data that is guaranteed to be safe:
// should be in heap, in known committed region, within that region.
ShenandoahHeap* heap = ShenandoahHeap::heap();
! if (!heap->is_in(loc)) return;
ShenandoahHeapRegion* r = heap->heap_region_containing(loc);
if (r != nullptr && r->is_committed()) {
address start = MAX2((address) r->bottom(), (address) loc - 32);
address end = MIN2((address) r->end(), (address) loc + 128);
void print_raw_memory(ShenandoahMessageBuffer &msg, void* loc) {
// Be extra safe. Only access data that is guaranteed to be safe:
// should be in heap, in known committed region, within that region.
ShenandoahHeap* heap = ShenandoahHeap::heap();
! if (!heap->is_in_reserved(loc)) return;
ShenandoahHeapRegion* r = heap->heap_region_containing(loc);
if (r != nullptr && r->is_committed()) {
address start = MAX2((address) r->bottom(), (address) loc - 32);
address end = MIN2((address) r->end(), (address) loc + 128);
msg.append(" %3s allocated after mark start\n", ctx->allocated_after_mark_start(obj) ? "" : "not");
msg.append(" %3s after update watermark\n", cast_from_oop<HeapWord*>(obj) >= r->get_update_watermark() ? "" : "not");
msg.append(" %3s marked strong\n", ctx->is_marked_strong(obj) ? "" : "not");
msg.append(" %3s marked weak\n", ctx->is_marked_weak(obj) ? "" : "not");
msg.append(" %3s in collection set\n", heap->in_collection_set(obj) ? "" : "not");
msg.append(" mark:%s\n", mw_ss.freeze());
msg.append(" region: %s", ss.freeze());
}
void ShenandoahAsserts::print_non_obj(ShenandoahMessageBuffer& msg, void* loc) {
ShenandoahHeap* heap = ShenandoahHeap::heap();
! if (heap->is_in(loc)) {
msg.append(" inside Java heap\n");
ShenandoahHeapRegion *r = heap->heap_region_containing(loc);
stringStream ss;
r->print_on(&ss);
msg.append(" %3s allocated after mark start\n", ctx->allocated_after_mark_start(obj) ? "" : "not");
msg.append(" %3s after update watermark\n", cast_from_oop<HeapWord*>(obj) >= r->get_update_watermark() ? "" : "not");
msg.append(" %3s marked strong\n", ctx->is_marked_strong(obj) ? "" : "not");
msg.append(" %3s marked weak\n", ctx->is_marked_weak(obj) ? "" : "not");
msg.append(" %3s in collection set\n", heap->in_collection_set(obj) ? "" : "not");
+ if (heap->mode()->is_generational() && !obj->is_forwarded()) {
+ msg.append(" age: %d\n", obj->age());
+ }
msg.append(" mark:%s\n", mw_ss.freeze());
msg.append(" region: %s", ss.freeze());
}
void ShenandoahAsserts::print_non_obj(ShenandoahMessageBuffer& msg, void* loc) {
ShenandoahHeap* heap = ShenandoahHeap::heap();
! if (heap->is_in_reserved(loc)) {
msg.append(" inside Java heap\n");
ShenandoahHeapRegion *r = heap->heap_region_containing(loc);
stringStream ss;
r->print_on(&ss);
}
void ShenandoahAsserts::print_obj_safe(ShenandoahMessageBuffer& msg, void* loc) {
ShenandoahHeap* heap = ShenandoahHeap::heap();
msg.append(" " PTR_FORMAT " - safe print, no details\n", p2i(loc));
! if (heap->is_in(loc)) {
ShenandoahHeapRegion* r = heap->heap_region_containing(loc);
if (r != nullptr) {
stringStream ss;
r->print_on(&ss);
msg.append(" region: %s", ss.freeze());
}
void ShenandoahAsserts::print_obj_safe(ShenandoahMessageBuffer& msg, void* loc) {
ShenandoahHeap* heap = ShenandoahHeap::heap();
msg.append(" " PTR_FORMAT " - safe print, no details\n", p2i(loc));
! if (heap->is_in_reserved(loc)) {
ShenandoahHeapRegion* r = heap->heap_region_containing(loc);
if (r != nullptr) {
stringStream ss;
r->print_on(&ss);
msg.append(" region: %s", ss.freeze());
const char* phase, const char* label,
const char* file, int line) {
ShenandoahHeap* heap = ShenandoahHeap::heap();
ResourceMark rm;
! bool loc_in_heap = (loc != nullptr && heap->is_in(loc));
ShenandoahMessageBuffer msg("%s; %s\n\n", phase, label);
msg.append("Referenced from:\n");
if (interior_loc != nullptr) {
const char* phase, const char* label,
const char* file, int line) {
ShenandoahHeap* heap = ShenandoahHeap::heap();
ResourceMark rm;
! bool loc_in_heap = (loc != nullptr && heap->is_in_reserved(loc));
ShenandoahMessageBuffer msg("%s; %s\n\n", phase, label);
msg.append("Referenced from:\n");
if (interior_loc != nullptr) {
}
report_vm_error(file, line, msg.buffer());
}
! void ShenandoahAsserts::assert_in_heap(void* interior_loc, oop obj, const char *file, int line) {
ShenandoahHeap* heap = ShenandoahHeap::heap();
! if (!heap->is_in(obj)) {
! print_failure(_safe_unknown, obj, interior_loc, nullptr, "Shenandoah assert_in_heap failed",
! "oop must point to a heap address",
file, line);
}
}
! void ShenandoahAsserts::assert_in_heap_or_null(void* interior_loc, oop obj, const char *file, int line) {
ShenandoahHeap* heap = ShenandoahHeap::heap();
! if (obj != nullptr && !heap->is_in(obj)) {
! print_failure(_safe_unknown, obj, interior_loc, nullptr, "Shenandoah assert_in_heap_or_null failed",
! "oop must point to a heap address",
file, line);
}
}
void ShenandoahAsserts::assert_correct(void* interior_loc, oop obj, const char* file, int line) {
ShenandoahHeap* heap = ShenandoahHeap::heap();
// Step 1. Check that obj is correct.
// After this step, it is safe to call heap_region_containing().
! if (!heap->is_in(obj)) {
print_failure(_safe_unknown, obj, interior_loc, nullptr, "Shenandoah assert_correct failed",
! "oop must point to a heap address",
file, line);
}
Klass* obj_klass = obj->klass_or_null();
if (obj_klass == nullptr) {
}
report_vm_error(file, line, msg.buffer());
}
! void ShenandoahAsserts::assert_in_heap_bounds(void* interior_loc, oop obj, const char *file, int line) {
ShenandoahHeap* heap = ShenandoahHeap::heap();
! if (!heap->is_in_reserved(obj)) {
! print_failure(_safe_unknown, obj, interior_loc, nullptr, "Shenandoah assert_in_heap_bounds failed",
! "oop must be in heap bounds",
file, line);
}
}
! void ShenandoahAsserts::assert_in_heap_bounds_or_null(void* interior_loc, oop obj, const char *file, int line) {
ShenandoahHeap* heap = ShenandoahHeap::heap();
! if (obj != nullptr && !heap->is_in_reserved(obj)) {
! print_failure(_safe_unknown, obj, interior_loc, nullptr, "Shenandoah assert_in_heap_bounds_or_null failed",
! "oop must be in heap bounds",
file, line);
}
}
void ShenandoahAsserts::assert_correct(void* interior_loc, oop obj, const char* file, int line) {
ShenandoahHeap* heap = ShenandoahHeap::heap();
// Step 1. Check that obj is correct.
// After this step, it is safe to call heap_region_containing().
! if (!heap->is_in_reserved(obj)) {
print_failure(_safe_unknown, obj, interior_loc, nullptr, "Shenandoah assert_correct failed",
! "oop must be in heap bounds",
file, line);
}
Klass* obj_klass = obj->klass_or_null();
if (obj_klass == nullptr) {
print_failure(_safe_unknown, obj, interior_loc, nullptr, "Shenandoah assert_correct failed",
"Object klass pointer must go to metaspace",
file,line);
}
+ if (!heap->is_in(obj)) {
+ print_failure(_safe_unknown, obj, interior_loc, nullptr, "Shenandoah assert_correct failed",
+ "Object should be in active region area",
+ file, line);
+ }
+
oop fwd = ShenandoahForwarding::get_forwardee_raw_unchecked(obj);
if (obj != fwd) {
// When Full GC moves the objects, we cannot trust fwdptrs. If we got here, it means something
// tries fwdptr manipulation when Full GC is running. The only exception is using the fwdptr
"Non-trivial forwarding pointer during Full GC moves, probable bug.",
file, line);
}
// Step 2. Check that forwardee is correct
! if (!heap->is_in(fwd)) {
print_failure(_safe_oop, obj, interior_loc, nullptr, "Shenandoah assert_correct failed",
! "Forwardee must point to a heap address",
file, line);
}
if (obj_klass != fwd->klass()) {
print_failure(_safe_oop, obj, interior_loc, nullptr, "Shenandoah assert_correct failed",
"Forwardee klass disagrees with object class",
file, line);
}
// Step 3. Check that forwardee points to correct region
if (heap->heap_region_index_containing(fwd) == heap->heap_region_index_containing(obj)) {
print_failure(_safe_all, obj, interior_loc, nullptr, "Shenandoah assert_correct failed",
! "Non-trivial forwardee should in another region",
file, line);
}
// Step 4. Check for multiple forwardings
oop fwd2 = ShenandoahForwarding::get_forwardee_raw_unchecked(fwd);
"Non-trivial forwarding pointer during Full GC moves, probable bug.",
file, line);
}
// Step 2. Check that forwardee is correct
! if (!heap->is_in_reserved(fwd)) {
print_failure(_safe_oop, obj, interior_loc, nullptr, "Shenandoah assert_correct failed",
! "Forwardee must be in heap bounds",
file, line);
}
if (obj_klass != fwd->klass()) {
print_failure(_safe_oop, obj, interior_loc, nullptr, "Shenandoah assert_correct failed",
"Forwardee klass disagrees with object class",
file, line);
}
// Step 3. Check that forwardee points to correct region
+ if (!heap->is_in(fwd)) {
+ print_failure(_safe_oop, obj, interior_loc, nullptr, "Shenandoah assert_correct failed",
+ "Forwardee should be in active region area",
+ file, line);
+ }
+
if (heap->heap_region_index_containing(fwd) == heap->heap_region_index_containing(obj)) {
print_failure(_safe_all, obj, interior_loc, nullptr, "Shenandoah assert_correct failed",
! "Non-trivial forwardee should be in another region",
file, line);
}
// Step 4. Check for multiple forwardings
oop fwd2 = ShenandoahForwarding::get_forwardee_raw_unchecked(fwd);
print_failure(_safe_all, obj, interior_loc, nullptr, "Shenandoah assert_correct failed",
"Multiple forwardings",
file, line);
}
}
+
+ // Do additional checks for special objects: their fields can hold metadata as well.
+ // We want to check class loading/unloading did not corrupt them.
+
+ if (obj_klass == vmClasses::Class_klass()) {
+ Metadata* klass = obj->metadata_field(java_lang_Class::klass_offset());
+ if (klass != nullptr && !Metaspace::contains(klass)) {
+ print_failure(_safe_all, obj, interior_loc, nullptr, "Shenandoah assert_correct failed",
+ "Instance class mirror should point to Metaspace",
+ file, line);
+ }
+
+ Metadata* array_klass = obj->metadata_field(java_lang_Class::array_klass_offset());
+ if (array_klass != nullptr && !Metaspace::contains(array_klass)) {
+ print_failure(_safe_all, obj, interior_loc, nullptr, "Shenandoah assert_correct failed",
+ "Array class mirror should point to Metaspace",
+ file, line);
+ }
+ }
}
void ShenandoahAsserts::assert_in_correct_region(void* interior_loc, oop obj, const char* file, int line) {
assert_correct(interior_loc, obj, file, line);
"Object must reside in active region",
file, line);
}
size_t alloc_size = obj->size();
! if (alloc_size > ShenandoahHeapRegion::humongous_threshold_words()) {
size_t idx = r->index();
size_t num_regions = ShenandoahHeapRegion::required_regions(alloc_size * HeapWordSize);
for (size_t i = idx; i < idx + num_regions; i++) {
ShenandoahHeapRegion* chain_reg = heap->get_region(i);
if (i == idx && !chain_reg->is_humongous_start()) {
"Object must reside in active region",
file, line);
}
size_t alloc_size = obj->size();
! if (ShenandoahHeapRegion::requires_humongous(alloc_size)) {
size_t idx = r->index();
size_t num_regions = ShenandoahHeapRegion::required_regions(alloc_size * HeapWordSize);
for (size_t i = idx; i < idx + num_regions; i++) {
ShenandoahHeapRegion* chain_reg = heap->get_region(i);
if (i == idx && !chain_reg->is_humongous_start()) {
if (lock->owned_by_self()) {
return;
}
! ShenandoahMessageBuffer msg("Must ba at a Shenandoah safepoint or held %s lock", lock->name());
report_vm_error(file, line, msg.buffer());
}
void ShenandoahAsserts::assert_heaplocked(const char* file, int line) {
ShenandoahHeap* heap = ShenandoahHeap::heap();
if (lock->owned_by_self()) {
return;
}
! ShenandoahMessageBuffer msg("Must be at a Shenandoah safepoint or held %s lock", lock->name());
report_vm_error(file, line, msg.buffer());
}
void ShenandoahAsserts::assert_heaplocked(const char* file, int line) {
ShenandoahHeap* heap = ShenandoahHeap::heap();
if (heap->lock()->owned_by_self()) {
return;
}
! if (ShenandoahSafepoint::is_at_shenandoah_safepoint() && Thread::current()->is_VM_thread()) {
return;
}
ShenandoahMessageBuffer msg("Heap lock must be owned by current thread, or be at safepoint");
report_vm_error(file, line, msg.buffer());
}
if (heap->lock()->owned_by_self()) {
return;
}
! if (ShenandoahSafepoint::is_at_shenandoah_safepoint()) {
return;
}
ShenandoahMessageBuffer msg("Heap lock must be owned by current thread, or be at safepoint");
report_vm_error(file, line, msg.buffer());
}
+
+ void ShenandoahAsserts::assert_generational(const char* file, int line) {
+ if (ShenandoahHeap::heap()->mode()->is_generational()) {
+ return;
+ }
+
+ ShenandoahMessageBuffer msg("Must be in generational mode");
+ report_vm_error(file, line, msg.buffer());
+ }
+
+ void ShenandoahAsserts::assert_control_or_vm_thread_at_safepoint(bool at_safepoint, const char* file, int line) {
+ Thread* thr = Thread::current();
+ if (thr == ShenandoahHeap::heap()->control_thread()) {
+ return;
+ }
+ if (thr->is_VM_thread()) {
+ if (!at_safepoint) {
+ return;
+ } else if (SafepointSynchronize::is_at_safepoint()) {
+ return;
+ }
+ }
+
+ ShenandoahMessageBuffer msg("Must be either control thread, or vm thread");
+ if (at_safepoint) {
+ msg.append(" at a safepoint");
+ }
+ report_vm_error(file, line, msg.buffer());
+ }
+
+ void ShenandoahAsserts::assert_generations_reconciled(const char* file, int line) {
+ if (!SafepointSynchronize::is_at_safepoint()) {
+ return;
+ }
+
+ ShenandoahHeap* heap = ShenandoahHeap::heap();
+ ShenandoahGeneration* ggen = heap->gc_generation();
+ ShenandoahGeneration* agen = heap->active_generation();
+ if (agen == ggen) {
+ return;
+ }
+
+ ShenandoahMessageBuffer msg("Active(%d) & GC(%d) Generations aren't reconciled", agen->type(), ggen->type());
+ report_vm_error(file, line, msg.buffer());
+ }
< prev index next >