< prev index next > src/hotspot/share/oops/oop.inline.hpp
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#include "oops/access.inline.hpp"
#include "oops/arrayKlass.hpp"
#include "oops/arrayOop.hpp"
#include "oops/compressedKlass.inline.hpp"
#include "oops/instanceKlass.hpp"
- #include "oops/markWord.hpp"
+ #include "oops/markWord.inline.hpp"
#include "oops/oopsHierarchy.hpp"
#include "runtime/atomic.hpp"
#include "runtime/globals.hpp"
#include "utilities/align.hpp"
#include "utilities/debug.hpp"
void oopDesc::set_mark(HeapWord* mem, markWord m) {
*(markWord*)(((char*)mem) + mark_offset_in_bytes()) = m;
}
- void oopDesc::release_set_mark(HeapWord* mem, markWord m) {
- Atomic::release_store((markWord*)(((char*)mem) + mark_offset_in_bytes()), m);
- }
-
void oopDesc::release_set_mark(markWord m) {
Atomic::release_store(&_mark, m);
}
+ void oopDesc::release_set_mark(HeapWord* mem, markWord m) {
+ Atomic::release_store((markWord*)(((char*)mem) + mark_offset_in_bytes()), m);
+ }
+
markWord oopDesc::cas_set_mark(markWord new_mark, markWord old_mark) {
return Atomic::cmpxchg(&_mark, old_mark, new_mark);
}
markWord oopDesc::cas_set_mark(markWord new_mark, markWord old_mark, atomic_memory_order order) {
return Atomic::cmpxchg(&_mark, old_mark, new_mark, order);
}
+ markWord oopDesc::prototype_mark() const {
+ if (UseCompactObjectHeaders) {
+ return klass()->prototype_header();
+ } else {
+ return markWord::prototype();
+ }
+ }
+
void oopDesc::init_mark() {
- set_mark(markWord::prototype());
+ if (UseCompactObjectHeaders) {
+ set_mark(prototype_mark());
+ } else {
+ set_mark(markWord::prototype());
+ }
}
Klass* oopDesc::klass() const {
- if (UseCompressedClassPointers) {
- return CompressedKlassPointers::decode_not_null(_metadata._compressed_klass);
+ if (UseCompactObjectHeaders) {
+ return mark().klass();
+ } else if (UseCompressedClassPointers) {
+ return CompressedKlassPointers::decode_not_null(_metadata._compressed_klass);
} else {
return _metadata._klass;
}
}
Klass* oopDesc::klass_or_null() const {
- if (UseCompressedClassPointers) {
+ if (UseCompactObjectHeaders) {
+ return mark().klass_or_null();
+ } else if (UseCompressedClassPointers) {
return CompressedKlassPointers::decode(_metadata._compressed_klass);
} else {
return _metadata._klass;
}
}
Klass* oopDesc::klass_or_null_acquire() const {
- if (UseCompressedClassPointers) {
+ if (UseCompactObjectHeaders) {
+ return mark_acquire().klass();
+ } else if (UseCompressedClassPointers) {
narrowKlass nklass = Atomic::load_acquire(&_metadata._compressed_klass);
return CompressedKlassPointers::decode(nklass);
} else {
return Atomic::load_acquire(&_metadata._klass);
}
}
Klass* oopDesc::klass_without_asserts() const {
- if (UseCompressedClassPointers) {
+ if (UseCompactObjectHeaders) {
+ return mark().klass_without_asserts();
+ } else if (UseCompressedClassPointers) {
return CompressedKlassPointers::decode_without_asserts(_metadata._compressed_klass);
} else {
return _metadata._klass;
}
}
void oopDesc::set_klass(Klass* k) {
assert(Universe::is_bootstrapping() || (k != nullptr && k->is_klass()), "incorrect Klass");
+ assert(!UseCompactObjectHeaders, "don't set Klass* with compact headers");
if (UseCompressedClassPointers) {
_metadata._compressed_klass = CompressedKlassPointers::encode_not_null(k);
} else {
_metadata._klass = k;
}
}
void oopDesc::release_set_klass(HeapWord* mem, Klass* k) {
assert(Universe::is_bootstrapping() || (k != nullptr && k->is_klass()), "incorrect Klass");
+ assert(!UseCompactObjectHeaders, "don't set Klass* with compact headers");
char* raw_mem = ((char*)mem + klass_offset_in_bytes());
if (UseCompressedClassPointers) {
Atomic::release_store((narrowKlass*)raw_mem,
CompressedKlassPointers::encode_not_null(k));
} else {
Atomic::release_store((Klass**)raw_mem, k);
}
}
void oopDesc::set_klass_gap(HeapWord* mem, int v) {
+ assert(!UseCompactObjectHeaders, "don't set Klass* gap with compact headers");
if (UseCompressedClassPointers) {
*(int*)(((char*)mem) + klass_gap_offset_in_bytes()) = v;
}
}
// This code could be simplified, but by keeping array_header_in_bytes
// in units of bytes and doing it this way we can round up just once,
// skipping the intermediate round to HeapWordSize.
s = align_up(size_in_bytes, MinObjAlignmentInBytes) / HeapWordSize;
- assert(s == klass->oop_size(this) || size_might_change(), "wrong array object size");
+ assert(s == klass->oop_size(this) || size_might_change(klass), "wrong array object size");
} else {
// Must be zero, so bite the bullet and take the virtual call.
s = klass->oop_size(this);
}
}
assert(s > 0, "Oop size must be greater than zero, not " SIZE_FORMAT, s);
assert(is_object_aligned(s), "Oop size is not properly aligned: " SIZE_FORMAT, s);
return s;
}
+ #ifdef _LP64
+ Klass* oopDesc::forward_safe_klass_impl(markWord m) const {
+ assert(UseCompactObjectHeaders, "Only get here with compact headers");
+ if (m.is_marked()) {
+ oop fwd = forwardee(m);
+ markWord m2 = fwd->mark();
+ assert(!m2.is_marked() || m2.self_forwarded(), "no double forwarding: this: " PTR_FORMAT " (" INTPTR_FORMAT "), fwd: " PTR_FORMAT " (" INTPTR_FORMAT ")", p2i(this), m.value(), p2i(fwd), m2.value());
+ m = m2;
+ }
+ return m.klass();
+ }
+ #endif
+
+ Klass* oopDesc::forward_safe_klass(markWord m) const {
+ #ifdef _LP64
+ if (UseCompactObjectHeaders) {
+ return forward_safe_klass_impl(m);
+ } else
+ #endif
+ {
+ return klass();
+ }
+ }
+
+ Klass* oopDesc::forward_safe_klass() const {
+ #ifdef _LP64
+ if (UseCompactObjectHeaders) {
+ return forward_safe_klass_impl(mark());
+ } else
+ #endif
+ {
+ return klass();
+ }
+ }
+
+ size_t oopDesc::forward_safe_size() {
+ return size_given_klass(forward_safe_klass());
+ }
+
+ void oopDesc::forward_safe_init_mark() {
+ if (UseCompactObjectHeaders) {
+ set_mark(forward_safe_klass()->prototype_header());
+ } else {
+ set_mark(markWord::prototype());
+ }
+ }
+
bool oopDesc::is_instance() const { return klass()->is_instance_klass(); }
bool oopDesc::is_instanceRef() const { return klass()->is_reference_instance_klass(); }
bool oopDesc::is_stackChunk() const { return klass()->is_stack_chunk_instance_klass(); }
bool oopDesc::is_array() const { return klass()->is_array_klass(); }
bool oopDesc::is_objArray() const { return klass()->is_objArray_klass(); }
return mark().is_marked();
}
// Used by scavengers
bool oopDesc::is_forwarded() const {
- // The extra heap check is needed since the obj might be locked, in which case the
- // mark would point to a stack location and have the sentinel bit cleared
- return mark().is_marked();
+ return mark().is_forwarded();
+ }
+
+ bool oopDesc::is_self_forwarded() const {
+ return mark().self_forwarded();
}
// Used by scavengers
void oopDesc::forward_to(oop p) {
markWord m = markWord::encode_pointer_as_mark(p);
assert(m.decode_pointer() == p, "encoding must be reversible");
set_mark(m);
}
- oop oopDesc::forward_to_atomic(oop p, markWord compare, atomic_memory_order order) {
- markWord m = markWord::encode_pointer_as_mark(p);
- assert(m.decode_pointer() == p, "encoding must be reversible");
- markWord old_mark = cas_set_mark(m, compare, order);
+ void oopDesc::forward_to_self() {
+ set_mark(mark().set_self_forwarded());
+ }
+
+ oop oopDesc::cas_set_forwardee(markWord new_mark, markWord compare, atomic_memory_order order) {
+ markWord old_mark = cas_set_mark(new_mark, compare, order);
if (old_mark == compare) {
return nullptr;
} else {
- return cast_to_oop(old_mark.decode_pointer());
+ assert(old_mark.is_forwarded(), "must be forwarded here");
+ return forwardee(old_mark);
+ }
+ }
+
+ oop oopDesc::forward_to_atomic(oop p, markWord compare, atomic_memory_order order) {
+ markWord m = markWord::encode_pointer_as_mark(p);
+ assert(forwardee(m) == p, "encoding must be reversible");
+ return cas_set_forwardee(m, compare, order);
+ }
+
+ oop oopDesc::forward_to_self_atomic(markWord old_mark, atomic_memory_order order) {
+ markWord new_mark = old_mark.set_self_forwarded();
+ assert(forwardee(new_mark) == cast_to_oop(this), "encoding must be reversible");
+ return cas_set_forwardee(new_mark, old_mark, order);
+ }
+
+ oop oopDesc::forwardee(markWord mark) const {
+ assert(mark.is_forwarded(), "only decode when actually forwarded");
+ if (mark.self_forwarded()) {
+ return cast_to_oop(this);
+ } else {
+ return cast_to_oop(mark.decode_pointer());
}
}
// Note that the forwardee is not the same thing as the displaced_mark.
// The forwardee is used when copying during scavenge and mark-sweep.
// It does need to clear the low two locking- and GC-related bits.
oop oopDesc::forwardee() const {
assert(is_forwarded(), "only decode when actually forwarded");
- return cast_to_oop(mark().decode_pointer());
+ return forwardee(mark());
+ }
+
+ void oopDesc::unset_self_forwarded() {
+ set_mark(mark().unset_self_forwarded());
}
// The following method needs to be MT safe.
uint oopDesc::age() const {
markWord m = mark();
oop_iterate_backwards(cl, klass());
}
template <typename OopClosureType>
void oopDesc::oop_iterate_backwards(OopClosureType* cl, Klass* k) {
- assert(k == klass(), "wrong klass");
+ // In this assert, we cannot safely access the Klass* with compact headers.
+ assert(UseCompactObjectHeaders || k == klass(), "wrong klass");
OopIteratorClosureDispatch::oop_oop_iterate_backwards(cl, this, k);
}
bool oopDesc::is_instanceof_or_null(oop obj, Klass* klass) {
return obj == nullptr || obj->klass()->is_subtype_of(klass);
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