Mercurial > hg > truffle
diff src/share/vm/gc_interface/collectedHeap.inline.hpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
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children | ba764ed4b6f2 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/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