Mercurial > hg > truffle
view src/share/vm/oops/typeArrayKlass.hpp @ 9126:bc26f978b0ce
HotSpotResolvedObjectType: implement hasFinalizeSubclass() correctly
don't use the (wrong) cached value, but ask the runtime on each request.
Fixes regression on xml.* benchmarks @ specjvm2008. The problem was:
After the constructor of Object was deoptimized due to an assumption violation,
it was recompiled again after some time. However, on recompilation, the value
of hasFinalizeSubclass for the class was not updated and it was compiled again
with a, now wrong, assumption, which then triggers deoptimization again.
This was repeated until it hit the recompilation limit (defined by
PerMethodRecompilationCutoff), and therefore only executed by the interpreter
from now on, causing the performance regression.
author | Bernhard Urban <bernhard.urban@jku.at> |
---|---|
date | Mon, 15 Apr 2013 19:54:58 +0200 |
parents | d8ce2825b193 |
children | 6bd680e9ea35 |
line wrap: on
line source
/* * Copyright (c) 1997, 2012, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #ifndef SHARE_VM_OOPS_TYPEARRAYKLASS_HPP #define SHARE_VM_OOPS_TYPEARRAYKLASS_HPP #include "classfile/classLoaderData.hpp" #include "oops/arrayKlass.hpp" // A TypeArrayKlass is the klass of a typeArray // It contains the type and size of the elements class TypeArrayKlass : public ArrayKlass { friend class VMStructs; private: jint _max_length; // maximum number of elements allowed in an array // Constructor TypeArrayKlass(BasicType type, Symbol* name); static TypeArrayKlass* allocate(ClassLoaderData* loader_data, BasicType type, Symbol* name, TRAPS); public: TypeArrayKlass() {} // For dummy objects. // instance variables jint max_length() { return _max_length; } void set_max_length(jint m) { _max_length = m; } // testers bool oop_is_typeArray_slow() const { return true; } // klass allocation static TypeArrayKlass* create_klass(BasicType type, const char* name_str, TRAPS); static inline Klass* create_klass(BasicType type, int scale, TRAPS) { TypeArrayKlass* tak = create_klass(type, external_name(type), CHECK_NULL); assert(scale == (1 << tak->log2_element_size()), "scale must check out"); return tak; } int oop_size(oop obj) const; bool compute_is_subtype_of(Klass* k); // Allocation typeArrayOop allocate_common(int length, bool do_zero, TRAPS); typeArrayOop allocate(int length, TRAPS) { return allocate_common(length, true, THREAD); } oop multi_allocate(int rank, jint* sizes, TRAPS); // Copying void copy_array(arrayOop s, int src_pos, arrayOop d, int dst_pos, int length, TRAPS); // Iteration int oop_oop_iterate(oop obj, ExtendedOopClosure* blk); int oop_oop_iterate_m(oop obj, ExtendedOopClosure* blk, MemRegion mr); // Garbage collection void oop_follow_contents(oop obj); int oop_adjust_pointers(oop obj); // Parallel Scavenge and Parallel Old PARALLEL_GC_DECLS protected: // Find n'th dimensional array virtual Klass* array_klass_impl(bool or_null, int n, TRAPS); // Returns the array class with this class as element type virtual Klass* array_klass_impl(bool or_null, TRAPS); public: // Casting from Klass* static TypeArrayKlass* cast(Klass* k) { assert(k->oop_is_typeArray(), "cast to TypeArrayKlass"); return (TypeArrayKlass*) k; } // Naming static const char* external_name(BasicType type); // Sizing static int header_size() { return sizeof(TypeArrayKlass)/HeapWordSize; } int size() const { return ArrayKlass::static_size(header_size()); } // Initialization (virtual from Klass) void initialize(TRAPS); public: // Printing #ifndef PRODUCT void oop_print_on(oop obj, outputStream* st); #endif void print_on(outputStream* st) const; void print_value_on(outputStream* st) const; public: const char* internal_name() const; }; #endif // SHARE_VM_OOPS_TYPEARRAYKLASS_HPP