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From 213dd3425bd0681a0ad4ed3c5f004898be645d86 Mon Sep 17 00:00:00 2001
Date: Thu, 15 Aug 2019 11:15:18 +0000
Subject: [PATCH] Backport of JDK-8158946 JDK-8165808 JDK-8166583 JDK-8166862
summary: Add release barriers when allocating objects with concurrent collection && CMS needs klass_or_null_acquire
LLT:
Bug url: https://bugs.openjdk.java.net/browse/JDK-8158946 https://bugs.openjdk.java.net/browse/JDK-8165808 https://bugs.openjdk.java.net/browse/JDK-8166583 https://bugs.openjdk.java.net/browse/JDK-8166862
---
.../src/share/vm/classfile/javaClasses.cpp | 5 +-
.../compactibleFreeListSpace.cpp | 23 ++------
.../concurrentMarkSweepGeneration.cpp | 16 +++---
.../share/vm/gc_interface/collectedHeap.cpp | 16 ++++++
.../share/vm/gc_interface/collectedHeap.hpp | 6 +--
.../vm/gc_interface/collectedHeap.inline.hpp | 54 ++++++++++---------
.../src/share/vm/oops/instanceMirrorKlass.cpp | 7 ++-
hotspot/src/share/vm/oops/oop.hpp | 2 +
hotspot/src/share/vm/oops/oop.inline.hpp | 38 ++++++++++---
9 files changed, 103 insertions(+), 64 deletions(-)
diff --git a/hotspot/src/share/vm/classfile/javaClasses.cpp b/hotspot/src/share/vm/classfile/javaClasses.cpp
index 1bad10334..719db22b7 100644
--- a/hotspot/src/share/vm/classfile/javaClasses.cpp
+++ b/hotspot/src/share/vm/classfile/javaClasses.cpp
@@ -651,10 +651,13 @@ void java_lang_Class::create_mirror(KlassHandle k, Handle class_loader,
int java_lang_Class::oop_size(oop java_class) {
assert(_oop_size_offset != 0, "must be set");
- return java_class->int_field(_oop_size_offset);
+ int size = java_class->int_field(_oop_size_offset);
+ assert(size > 0, "Oop size must be greater than zero");
+ return size;
}
void java_lang_Class::set_oop_size(oop java_class, int size) {
assert(_oop_size_offset != 0, "must be set");
+ assert(size > 0, "Oop size must be greater than zero");
java_class->int_field_put(_oop_size_offset, size);
}
int java_lang_Class::static_oop_field_count(oop java_class) {
diff --git a/hotspot/src/share/vm/gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.cpp b/hotspot/src/share/vm/gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.cpp
index e5a3a1106..2de68f7ae 100644
--- a/hotspot/src/share/vm/gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.cpp
+++ b/hotspot/src/share/vm/gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.cpp
@@ -984,18 +984,13 @@ size_t CompactibleFreeListSpace::block_size(const HeapWord* p) const {
return res;
}
} else {
- // must read from what 'p' points to in each loop.
- Klass* k = ((volatile oopDesc*)p)->klass_or_null();
+ // Ensure klass read before size.
+ Klass* k = oop(p)->klass_or_null_acquire();
if (k != NULL) {
assert(k->is_klass(), "Should really be klass oop.");
oop o = (oop)p;
assert(o->is_oop(true /* ignore mark word */), "Should be an oop.");
- // Bugfix for systems with weak memory model (PPC64/IA64).
- // The object o may be an array. Acquire to make sure that the array
- // size (third word) is consistent.
- OrderAccess::acquire();
-
size_t res = o->size_given_klass(k);
res = adjustObjectSize(res);
assert(res != 0, "Block size should not be 0");
@@ -1039,21 +1034,13 @@ const {
return res;
}
} else {
- // must read from what 'p' points to in each loop.
- Klass* k = ((volatile oopDesc*)p)->klass_or_null();
- // We trust the size of any object that has a non-NULL
- // klass and (for those in the perm gen) is parsable
- // -- irrespective of its conc_safe-ty.
+ // Ensure klass read before size.
+ Klass* k = oop(p)->klass_or_null_acquire();
if (k != NULL) {
assert(k->is_klass(), "Should really be klass oop.");
oop o = (oop)p;
assert(o->is_oop(), "Should be an oop");
- // Bugfix for systems with weak memory model (PPC64/IA64).
- // The object o may be an array. Acquire to make sure that the array
- // size (third word) is consistent.
- OrderAccess::acquire();
-
size_t res = o->size_given_klass(k);
res = adjustObjectSize(res);
assert(res != 0, "Block size should not be 0");
@@ -1101,7 +1088,7 @@ bool CompactibleFreeListSpace::block_is_obj(const HeapWord* p) const {
// assert(CollectedHeap::use_parallel_gc_threads() || _bt.block_start(p) == p,
// "Should be a block boundary");
if (FreeChunk::indicatesFreeChunk(p)) return false;
- Klass* k = oop(p)->klass_or_null();
+ Klass* k = oop(p)->klass_or_null_acquire();
if (k != NULL) {
// Ignore mark word because it may have been used to
// chain together promoted objects (the last one
diff --git a/hotspot/src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.cpp b/hotspot/src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.cpp
index 701231b4a..e3c0048da 100644
--- a/hotspot/src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.cpp
+++ b/hotspot/src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.cpp
@@ -6715,7 +6715,7 @@ size_t CMSCollector::block_size_if_printezis_bits(HeapWord* addr) const {
HeapWord* CMSCollector::next_card_start_after_block(HeapWord* addr) const {
size_t sz = 0;
oop p = (oop)addr;
- if (p->klass_or_null() != NULL) {
+ if (p->klass_or_null_acquire() != NULL) {
sz = CompactibleFreeListSpace::adjustObjectSize(p->size());
} else {
sz = block_size_using_printezis_bits(addr);
@@ -7173,7 +7173,7 @@ size_t ScanMarkedObjectsAgainCarefullyClosure::do_object_careful_m(
}
if (_bitMap->isMarked(addr)) {
// it's marked; is it potentially uninitialized?
- if (p->klass_or_null() != NULL) {
+ if (p->klass_or_null_acquire() != NULL) {
// an initialized object; ignore mark word in verification below
// since we are running concurrent with mutators
assert(p->is_oop(true), "should be an oop");
@@ -7214,7 +7214,7 @@ size_t ScanMarkedObjectsAgainCarefullyClosure::do_object_careful_m(
}
} else {
// Either a not yet marked object or an uninitialized object
- if (p->klass_or_null() == NULL) {
+ if (p->klass_or_null_acquire() == NULL) {
// An uninitialized object, skip to the next card, since
// we may not be able to read its P-bits yet.
assert(size == 0, "Initial value");
@@ -7425,7 +7425,7 @@ bool MarkFromRootsClosure::do_bit(size_t offset) {
assert(_skipBits == 0, "tautology");
_skipBits = 2; // skip next two marked bits ("Printezis-marks")
oop p = oop(addr);
- if (p->klass_or_null() == NULL) {
+ if (p->klass_or_null_acquire() == NULL) {
DEBUG_ONLY(if (!_verifying) {)
// We re-dirty the cards on which this object lies and increase
// the _threshold so that we'll come back to scan this object
@@ -7445,7 +7445,7 @@ bool MarkFromRootsClosure::do_bit(size_t offset) {
if (_threshold < end_card_addr) {
_threshold = end_card_addr;
}
- if (p->klass_or_null() != NULL) {
+ if (p->klass_or_null_acquire() != NULL) {
// Redirty the range of cards...
_mut->mark_range(redirty_range);
} // ...else the setting of klass will dirty the card anyway.
@@ -7596,7 +7596,7 @@ bool Par_MarkFromRootsClosure::do_bit(size_t offset) {
assert(_skip_bits == 0, "tautology");
_skip_bits = 2; // skip next two marked bits ("Printezis-marks")
oop p = oop(addr);
- if (p->klass_or_null() == NULL) {
+ if (p->klass_or_null_acquire() == NULL) {
// in the case of Clean-on-Enter optimization, redirty card
// and avoid clearing card by increasing the threshold.
return true;
@@ -8583,7 +8583,7 @@ size_t SweepClosure::do_live_chunk(FreeChunk* fc) {
"alignment problem");
#ifdef ASSERT
- if (oop(addr)->klass_or_null() != NULL) {
+ if (oop(addr)->klass_or_null_acquire() != NULL) {
// Ignore mark word because we are running concurrent with mutators
assert(oop(addr)->is_oop(true), "live block should be an oop");
assert(size ==
@@ -8594,7 +8594,7 @@ size_t SweepClosure::do_live_chunk(FreeChunk* fc) {
} else {
// This should be an initialized object that's alive.
- assert(oop(addr)->klass_or_null() != NULL,
+ assert(oop(addr)->klass_or_null_acquire() != NULL,
"Should be an initialized object");
// Ignore mark word because we are running concurrent with mutators
assert(oop(addr)->is_oop(true), "live block should be an oop");
diff --git a/hotspot/src/share/vm/gc_interface/collectedHeap.cpp b/hotspot/src/share/vm/gc_interface/collectedHeap.cpp
index 3ae8d61d0..e79251e13 100644
--- a/hotspot/src/share/vm/gc_interface/collectedHeap.cpp
+++ b/hotspot/src/share/vm/gc_interface/collectedHeap.cpp
@@ -305,6 +305,22 @@ HeapWord* CollectedHeap::allocate_from_tlab_slow(KlassHandle klass, Thread* thre
return obj;
}
+void CollectedHeap::post_allocation_setup_class(KlassHandle klass,
+ HeapWord* obj_ptr,
+ int size) {
+ // Set oop_size field before setting the _klass field because a
+ // non-NULL _klass field indicates that the object is parsable by
+ // concurrent GC.
+ oop new_cls = (oop)obj_ptr;
+ assert(size > 0, "oop_size must be positive.");
+ java_lang_Class::set_oop_size(new_cls, size);
+ post_allocation_setup_common(klass, obj_ptr);
+ assert(Universe::is_bootstrapping() ||
+ !new_cls->is_array(), "must not be an array");
+ // notify jvmti and dtrace
+ post_allocation_notify(klass, new_cls, size);
+}
+
void CollectedHeap::flush_deferred_store_barrier(JavaThread* thread) {
MemRegion deferred = thread->deferred_card_mark();
if (!deferred.is_empty()) {
diff --git a/hotspot/src/share/vm/gc_interface/collectedHeap.hpp b/hotspot/src/share/vm/gc_interface/collectedHeap.hpp
index 898a660f2..c13d29780 100644
--- a/hotspot/src/share/vm/gc_interface/collectedHeap.hpp
+++ b/hotspot/src/share/vm/gc_interface/collectedHeap.hpp
@@ -157,6 +157,8 @@ class CollectedHeap : public CHeapObj<mtInternal> {
inline static void post_allocation_setup_array(KlassHandle klass,
HeapWord* obj, int length);
+ static void post_allocation_setup_class(KlassHandle klass, HeapWord* obj, int size);
+
// Clears an allocated object.
inline static void init_obj(HeapWord* obj, size_t size);
@@ -321,9 +323,7 @@ class CollectedHeap : public CHeapObj<mtInternal> {
inline static oop obj_allocate(KlassHandle klass, int size, TRAPS);
inline static oop array_allocate(KlassHandle klass, int size, int length, TRAPS);
inline static oop array_allocate_nozero(KlassHandle klass, int size, int length, TRAPS);
-
- inline static void post_allocation_install_obj_klass(KlassHandle klass,
- oop obj);
+ inline static oop class_allocate(KlassHandle klass, int size, TRAPS);
// Raw memory allocation facilities
// The obj and array allocate methods are covers for these methods.
diff --git a/hotspot/src/share/vm/gc_interface/collectedHeap.inline.hpp b/hotspot/src/share/vm/gc_interface/collectedHeap.inline.hpp
index 302d0c7cb..bdc97575f 100644
--- a/hotspot/src/share/vm/gc_interface/collectedHeap.inline.hpp
+++ b/hotspot/src/share/vm/gc_interface/collectedHeap.inline.hpp
@@ -39,14 +39,22 @@
// Inline allocation implementations.
void CollectedHeap::post_allocation_setup_common(KlassHandle klass,
- HeapWord* obj) {
- post_allocation_setup_no_klass_install(klass, obj);
- post_allocation_install_obj_klass(klass, oop(obj));
+ HeapWord* obj_ptr) {
+ post_allocation_setup_no_klass_install(klass, obj_ptr);
+ oop obj = (oop)obj_ptr;
+#if ! INCLUDE_ALL_GCS
+ obj->set_klass(klass());
+#else
+ // Need a release store to ensure array/class length, mark word, and
+ // object zeroing are visible before setting the klass non-NULL, for
+ // concurrent collectors.
+ obj->release_set_klass(klass());
+#endif
}
void CollectedHeap::post_allocation_setup_no_klass_install(KlassHandle klass,
- HeapWord* objPtr) {
- oop obj = (oop)objPtr;
+ HeapWord* obj_ptr) {
+ oop obj = (oop)obj_ptr;
assert(obj != NULL, "NULL object pointer");
if (UseBiasedLocking && (klass() != NULL)) {
@@ -57,18 +65,6 @@ void CollectedHeap::post_allocation_setup_no_klass_install(KlassHandle klass,
}
}
-void CollectedHeap::post_allocation_install_obj_klass(KlassHandle klass,
- oop obj) {
- // These asserts are kind of complicated because of klassKlass
- // and the beginning of the world.
- assert(klass() != NULL || !Universe::is_fully_initialized(), "NULL klass");
- assert(klass() == NULL || klass()->is_klass(), "not a klass");
- assert(obj != NULL, "NULL object pointer");
- obj->set_klass(klass());
- assert(!Universe::is_fully_initialized() || obj->klass() != NULL,
- "missing klass");
-}
-
// Support for jvmti and dtrace
inline void post_allocation_notify(KlassHandle klass, oop obj, int size) {
// support low memory notifications (no-op if not enabled)
@@ -96,15 +92,15 @@ void CollectedHeap::post_allocation_setup_obj(KlassHandle klass,
}
void CollectedHeap::post_allocation_setup_array(KlassHandle klass,
- HeapWord* obj,
+ HeapWord* obj_ptr,
int length) {
- // Set array length before setting the _klass field
- // in post_allocation_setup_common() because the klass field
- // indicates that the object is parsable by concurrent GC.
+ // Set array length before setting the _klass field because a
+ // non-NULL klass field indicates that the object is parsable by
+ // concurrent GC.
assert(length >= 0, "length should be non-negative");
- ((arrayOop)obj)->set_length(length);
- post_allocation_setup_common(klass, obj);
- oop new_obj = (oop)obj;
+ ((arrayOop)obj_ptr)->set_length(length);
+ post_allocation_setup_common(klass, obj_ptr);
+ oop new_obj = (oop)obj_ptr;
assert(new_obj->is_array(), "must be an array");
// notify jvmti and dtrace (must be after length is set for dtrace)
post_allocation_notify(klass, new_obj, new_obj->size());
@@ -206,6 +202,16 @@ oop CollectedHeap::obj_allocate(KlassHandle klass, int size, TRAPS) {
return (oop)obj;
}
+oop CollectedHeap::class_allocate(KlassHandle klass, int size, TRAPS) {
+ debug_only(check_for_valid_allocation_state());
+ assert(!Universe::heap()->is_gc_active(), "Allocation during gc not allowed");
+ assert(size >= 0, "int won't convert to size_t");
+ HeapWord* obj = common_mem_allocate_init(klass, size, CHECK_NULL);
+ post_allocation_setup_class(klass, obj, size); // set oop_size
+ NOT_PRODUCT(Universe::heap()->check_for_bad_heap_word_value(obj, size));
+ return (oop)obj;
+}
+
oop CollectedHeap::array_allocate(KlassHandle klass,
int size,
int length,
diff --git a/hotspot/src/share/vm/oops/instanceMirrorKlass.cpp b/hotspot/src/share/vm/oops/instanceMirrorKlass.cpp
index 5b4c7d0fd..73da78e5a 100644
--- a/hotspot/src/share/vm/oops/instanceMirrorKlass.cpp
+++ b/hotspot/src/share/vm/oops/instanceMirrorKlass.cpp
@@ -363,13 +363,12 @@ instanceOop InstanceMirrorKlass::allocate_instance(KlassHandle k, TRAPS) {
// Query before forming handle.
int size = instance_size(k);
KlassHandle h_k(THREAD, this);
- instanceOop i = (instanceOop)CollectedHeap::obj_allocate(h_k, size, CHECK_NULL);
+
+ assert(size > 0, "total object size must be positive");
// Since mirrors can be variable sized because of the static fields, store
// the size in the mirror itself.
- java_lang_Class::set_oop_size(i, size);
-
- return i;
+ return (instanceOop)CollectedHeap::class_allocate(h_k, size, CHECK_NULL);
}
int InstanceMirrorKlass::oop_size(oop obj) const {
diff --git a/hotspot/src/share/vm/oops/oop.hpp b/hotspot/src/share/vm/oops/oop.hpp
index 4b707abce..c1e9fd550 100644
--- a/hotspot/src/share/vm/oops/oop.hpp
+++ b/hotspot/src/share/vm/oops/oop.hpp
@@ -83,10 +83,12 @@ class oopDesc {
Klass* klass() const;
Klass* klass_or_null() const volatile;
+ inline Klass* klass_or_null_acquire() const volatile;
Klass** klass_addr();
narrowKlass* compressed_klass_addr();
void set_klass(Klass* k);
+ inline void release_set_klass(Klass* k);
// For klass field compression
int klass_gap() const;
diff --git a/hotspot/src/share/vm/oops/oop.inline.hpp b/hotspot/src/share/vm/oops/oop.inline.hpp
index 4632457bf..491f148b9 100644
--- a/hotspot/src/share/vm/oops/oop.inline.hpp
+++ b/hotspot/src/share/vm/oops/oop.inline.hpp
@@ -85,7 +85,6 @@ inline Klass* oopDesc::klass() const {
}
inline Klass* oopDesc::klass_or_null() const volatile {
- // can be NULL in CMS
if (UseCompressedClassPointers) {
return Klass::decode_klass(_metadata._compressed_klass);
} else {
@@ -98,6 +97,17 @@ inline int oopDesc::klass_gap_offset_in_bytes() {
return oopDesc::klass_offset_in_bytes() + sizeof(narrowKlass);
}
+Klass* oopDesc::klass_or_null_acquire() const volatile {
+ if (UseCompressedClassPointers) {
+ // Workaround for non-const load_acquire parameter.
+ const volatile narrowKlass* addr = &_metadata._compressed_klass;
+ volatile narrowKlass* xaddr = const_cast<volatile narrowKlass*>(addr);
+ return Klass::decode_klass(OrderAccess::load_acquire(xaddr));
+ } else {
+ return (Klass*)OrderAccess::load_ptr_acquire(&_metadata._klass);
+ }
+}
+
inline Klass** oopDesc::klass_addr() {
// Only used internally and with CMS and will not work with
// UseCompressedOops
@@ -110,10 +120,14 @@ inline narrowKlass* oopDesc::compressed_klass_addr() {
return &_metadata._compressed_klass;
}
+#define CHECK_SET_KLASS(k) \
+ do { \
+ assert(Universe::is_bootstrapping() || k != NULL, "NULL Klass"); \
+ assert(Universe::is_bootstrapping() || k->is_klass(), "not a Klass"); \
+ } while (0)
+
inline void oopDesc::set_klass(Klass* k) {
- // since klasses are promoted no store check is needed
- assert(Universe::is_bootstrapping() || k != NULL, "must be a real Klass*");
- assert(Universe::is_bootstrapping() || k->is_klass(), "not a Klass*");
+ CHECK_SET_KLASS(k);
if (UseCompressedClassPointers) {
*compressed_klass_addr() = Klass::encode_klass_not_null(k);
} else {
@@ -121,6 +135,18 @@ inline void oopDesc::set_klass(Klass* k) {
}
}
+void oopDesc::release_set_klass(Klass* k) {
+ CHECK_SET_KLASS(k);
+ if (UseCompressedClassPointers) {
+ OrderAccess::release_store(compressed_klass_addr(),
+ Klass::encode_klass_not_null(k));
+ } else {
+ OrderAccess::release_store_ptr(klass_addr(), k);
+ }
+}
+
+#undef CHECK_SET_KLASS
+
inline int oopDesc::klass_gap() const {
return *(int*)(((intptr_t)this) + klass_gap_offset_in_bytes());
}
@@ -511,8 +537,8 @@ inline int oopDesc::size_given_klass(Klass* klass) {
}
}
- assert(s % MinObjAlignment == 0, "alignment check");
- assert(s > 0, "Bad size calculated");
+ assert(s % MinObjAlignment == 0, "Oop size is not properly aligned");
+ assert(s > 0, "Oop size must be greater than zero");
return s;
}
--
2.19.0
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