--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/gc_interface/collectedHeap.inline.hpp Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,362 @@
+/*
+ * Copyright 2001-2007 Sun Microsystems, Inc. All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+// Inline allocation implementations.
+
+void CollectedHeap::post_allocation_setup_common(KlassHandle klass,
+ HeapWord* obj,
+ size_t size) {
+ post_allocation_setup_no_klass_install(klass, obj, size);
+ post_allocation_install_obj_klass(klass, oop(obj), (int) size);
+}
+
+void CollectedHeap::post_allocation_setup_no_klass_install(KlassHandle klass,
+ HeapWord* objPtr,
+ size_t size) {
+
+ oop obj = (oop)objPtr;
+
+ assert(obj != NULL, "NULL object pointer");
+ if (UseBiasedLocking && (klass() != NULL)) {
+ obj->set_mark(klass->prototype_header());
+ } else {
+ // May be bootstrapping
+ obj->set_mark(markOopDesc::prototype());
+ }
+
+ // support low memory notifications (no-op if not enabled)
+ LowMemoryDetector::detect_low_memory_for_collected_pools();
+}
+
+void CollectedHeap::post_allocation_install_obj_klass(KlassHandle klass,
+ oop obj,
+ int size) {
+ // 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(klass() == NULL || klass()->klass_part() != NULL, "not a klass");
+ assert(obj != NULL, "NULL object pointer");
+ obj->set_klass(klass());
+ assert(!Universe::is_fully_initialized() || obj->blueprint() != NULL,
+ "missing blueprint");
+
+ // support for JVMTI VMObjectAlloc event (no-op if not enabled)
+ JvmtiExport::vm_object_alloc_event_collector(obj);
+
+ if (DTraceAllocProbes) {
+ // support for Dtrace object alloc event (no-op most of the time)
+ if (klass() != NULL && klass()->klass_part()->name() != NULL) {
+ SharedRuntime::dtrace_object_alloc(obj);
+ }
+ }
+}
+
+void CollectedHeap::post_allocation_setup_obj(KlassHandle klass,
+ HeapWord* obj,
+ size_t size) {
+ post_allocation_setup_common(klass, obj, size);
+ assert(Universe::is_bootstrapping() ||
+ !((oop)obj)->blueprint()->oop_is_array(), "must not be an array");
+}
+
+void CollectedHeap::post_allocation_setup_array(KlassHandle klass,
+ HeapWord* obj,
+ size_t size,
+ int length) {
+ // Set array length before posting jvmti object alloc event
+ // in post_allocation_setup_common()
+ assert(length >= 0, "length should be non-negative");
+ ((arrayOop)obj)->set_length(length);
+ post_allocation_setup_common(klass, obj, size);
+ assert(((oop)obj)->blueprint()->oop_is_array(), "must be an array");
+}
+
+HeapWord* CollectedHeap::common_mem_allocate_noinit(size_t size, bool is_noref, TRAPS) {
+
+ // Clear unhandled oops for memory allocation. Memory allocation might
+ // not take out a lock if from tlab, so clear here.
+ CHECK_UNHANDLED_OOPS_ONLY(THREAD->clear_unhandled_oops();)
+
+ if (HAS_PENDING_EXCEPTION) {
+ NOT_PRODUCT(guarantee(false, "Should not allocate with exception pending"));
+ return NULL; // caller does a CHECK_0 too
+ }
+
+ // We may want to update this, is_noref objects might not be allocated in TLABs.
+ HeapWord* result = NULL;
+ if (UseTLAB) {
+ result = CollectedHeap::allocate_from_tlab(THREAD, size);
+ if (result != NULL) {
+ assert(!HAS_PENDING_EXCEPTION,
+ "Unexpected exception, will result in uninitialized storage");
+ return result;
+ }
+ }
+ bool gc_overhead_limit_was_exceeded;
+ result = Universe::heap()->mem_allocate(size,
+ is_noref,
+ false,
+ &gc_overhead_limit_was_exceeded);
+ if (result != NULL) {
+ NOT_PRODUCT(Universe::heap()->
+ check_for_non_bad_heap_word_value(result, size));
+ assert(!HAS_PENDING_EXCEPTION,
+ "Unexpected exception, will result in uninitialized storage");
+ return result;
+ }
+
+
+ if (!gc_overhead_limit_was_exceeded) {
+ // -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support
+ report_java_out_of_memory("Java heap space");
+
+ if (JvmtiExport::should_post_resource_exhausted()) {
+ JvmtiExport::post_resource_exhausted(
+ JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_JAVA_HEAP,
+ "Java heap space");
+ }
+
+ THROW_OOP_0(Universe::out_of_memory_error_java_heap());
+ } else {
+ // -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support
+ report_java_out_of_memory("GC overhead limit exceeded");
+
+ if (JvmtiExport::should_post_resource_exhausted()) {
+ JvmtiExport::post_resource_exhausted(
+ JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_JAVA_HEAP,
+ "GC overhead limit exceeded");
+ }
+
+ THROW_OOP_0(Universe::out_of_memory_error_gc_overhead_limit());
+ }
+}
+
+HeapWord* CollectedHeap::common_mem_allocate_init(size_t size, bool is_noref, TRAPS) {
+ HeapWord* obj = common_mem_allocate_noinit(size, is_noref, CHECK_NULL);
+ init_obj(obj, size);
+ return obj;
+}
+
+// Need to investigate, do we really want to throw OOM exception here?
+HeapWord* CollectedHeap::common_permanent_mem_allocate_noinit(size_t size, TRAPS) {
+ if (HAS_PENDING_EXCEPTION) {
+ NOT_PRODUCT(guarantee(false, "Should not allocate with exception pending"));
+ return NULL; // caller does a CHECK_NULL too
+ }
+
+#ifdef ASSERT
+ if (CIFireOOMAt > 0 && THREAD->is_Compiler_thread() &&
+ ++_fire_out_of_memory_count >= CIFireOOMAt) {
+ // For testing of OOM handling in the CI throw an OOM and see how
+ // it does. Historically improper handling of these has resulted
+ // in crashes which we really don't want to have in the CI.
+ THROW_OOP_0(Universe::out_of_memory_error_perm_gen());
+ }
+#endif
+
+ HeapWord* result = Universe::heap()->permanent_mem_allocate(size);
+ if (result != NULL) {
+ NOT_PRODUCT(Universe::heap()->
+ check_for_non_bad_heap_word_value(result, size));
+ assert(!HAS_PENDING_EXCEPTION,
+ "Unexpected exception, will result in uninitialized storage");
+ return result;
+ }
+ // -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support
+ report_java_out_of_memory("PermGen space");
+
+ if (JvmtiExport::should_post_resource_exhausted()) {
+ JvmtiExport::post_resource_exhausted(
+ JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR,
+ "PermGen space");
+ }
+
+ THROW_OOP_0(Universe::out_of_memory_error_perm_gen());
+}
+
+HeapWord* CollectedHeap::common_permanent_mem_allocate_init(size_t size, TRAPS) {
+ HeapWord* obj = common_permanent_mem_allocate_noinit(size, CHECK_NULL);
+ init_obj(obj, size);
+ return obj;
+}
+
+HeapWord* CollectedHeap::allocate_from_tlab(Thread* thread, size_t size) {
+ assert(UseTLAB, "should use UseTLAB");
+
+ HeapWord* obj = thread->tlab().allocate(size);
+ if (obj != NULL) {
+ return obj;
+ }
+ // Otherwise...
+ return allocate_from_tlab_slow(thread, size);
+}
+
+void CollectedHeap::init_obj(HeapWord* obj, size_t size) {
+ assert(obj != NULL, "cannot initialize NULL object");
+ const size_t hs = oopDesc::header_size();
+ assert(size >= hs, "unexpected object size");
+ Copy::fill_to_aligned_words(obj + hs, size - hs);
+}
+
+oop CollectedHeap::obj_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(size, false, CHECK_NULL);
+ post_allocation_setup_obj(klass, obj, 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,
+ 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(size, false, CHECK_NULL);
+ post_allocation_setup_array(klass, obj, size, length);
+ NOT_PRODUCT(Universe::heap()->check_for_bad_heap_word_value(obj, size));
+ return (oop)obj;
+}
+
+oop CollectedHeap::large_typearray_allocate(KlassHandle klass,
+ int size,
+ int length,
+ 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(size, true, CHECK_NULL);
+ post_allocation_setup_array(klass, obj, size, length);
+ NOT_PRODUCT(Universe::heap()->check_for_bad_heap_word_value(obj, size));
+ return (oop)obj;
+}
+
+oop CollectedHeap::permanent_obj_allocate(KlassHandle klass, int size, TRAPS) {
+ oop obj = permanent_obj_allocate_no_klass_install(klass, size, CHECK_NULL);
+ post_allocation_install_obj_klass(klass, obj, size);
+ NOT_PRODUCT(Universe::heap()->check_for_bad_heap_word_value((HeapWord*) obj,
+ size));
+ return obj;
+}
+
+oop CollectedHeap::permanent_obj_allocate_no_klass_install(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_permanent_mem_allocate_init(size, CHECK_NULL);
+ post_allocation_setup_no_klass_install(klass, obj, size);
+ NOT_PRODUCT(Universe::heap()->check_for_bad_heap_word_value(obj, size));
+ return (oop)obj;
+}
+
+oop CollectedHeap::permanent_array_allocate(KlassHandle klass,
+ int size,
+ int length,
+ 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_permanent_mem_allocate_init(size, CHECK_NULL);
+ post_allocation_setup_array(klass, obj, size, length);
+ NOT_PRODUCT(Universe::heap()->check_for_bad_heap_word_value(obj, size));
+ return (oop)obj;
+}
+
+// Returns "TRUE" if "p" is a method oop in the
+// current heap with high probability. NOTE: The main
+// current consumers of this interface are Forte::
+// and ThreadProfiler::. In these cases, the
+// interpreter frame from which "p" came, may be
+// under construction when sampled asynchronously, so
+// the clients want to check that it represents a
+// valid method before using it. Nonetheless since
+// the clients do not typically lock out GC, the
+// predicate is_valid_method() is not stable, so
+// it is possible that by the time "p" is used, it
+// is no longer valid.
+inline bool CollectedHeap::is_valid_method(oop p) const {
+ return
+ p != NULL &&
+
+ // Check whether it is aligned at a HeapWord boundary.
+ Space::is_aligned(p) &&
+
+ // Check whether "method" is in the allocated part of the
+ // permanent generation -- this needs to be checked before
+ // p->klass() below to avoid a SEGV (but see below
+ // for a potential window of vulnerability).
+ is_permanent((void*)p) &&
+
+ // See if GC is active; however, there is still an
+ // apparently unavoidable window after this call
+ // and before the client of this interface uses "p".
+ // If the client chooses not to lock out GC, then
+ // it's a risk the client must accept.
+ !is_gc_active() &&
+
+ // Check that p is a methodOop.
+ p->klass() == Universe::methodKlassObj();
+}
+
+
+#ifndef PRODUCT
+
+inline bool
+CollectedHeap::promotion_should_fail(volatile size_t* count) {
+ // Access to count is not atomic; the value does not have to be exact.
+ if (PromotionFailureALot) {
+ const size_t gc_num = total_collections();
+ const size_t elapsed_gcs = gc_num - _promotion_failure_alot_gc_number;
+ if (elapsed_gcs >= PromotionFailureALotInterval) {
+ // Test for unsigned arithmetic wrap-around.
+ if (++*count >= PromotionFailureALotCount) {
+ *count = 0;
+ return true;
+ }
+ }
+ }
+ return false;
+}
+
+inline bool CollectedHeap::promotion_should_fail() {
+ return promotion_should_fail(&_promotion_failure_alot_count);
+}
+
+inline void CollectedHeap::reset_promotion_should_fail(volatile size_t* count) {
+ if (PromotionFailureALot) {
+ _promotion_failure_alot_gc_number = total_collections();
+ *count = 0;
+ }
+}
+
+inline void CollectedHeap::reset_promotion_should_fail() {
+ reset_promotion_should_fail(&_promotion_failure_alot_count);
+}
+#endif // #ifndef PRODUCT