Mercurial > hg > graal-jvmci-8
view src/share/vm/interpreter/interpreterRuntime.hpp @ 1716:be3f9c242c9d
6948538: CMS: BOT walkers can fall into object allocation and initialization cracks
Summary: GC workers now recognize an intermediate transient state of blocks which are allocated but have not yet completed initialization. blk_start() calls do not attempt to determine the size of a block in the transient state, rather waiting for the block to become initialized so that it is safe to query its size. Audited and ensured the order of initialization of object fields (klass, free bit and size) to respect block state transition protocol. Also included some new assertion checking code enabled in debug mode.
Reviewed-by: chrisphi, johnc, poonam
author | ysr |
---|---|
date | Mon, 16 Aug 2010 15:58:42 -0700 |
parents | 136b78722a08 |
children | f95d63e2154a |
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/* * Copyright (c) 1997, 2010, 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. * */ // The InterpreterRuntime is called by the interpreter for everything // that cannot/should not be dealt with in assembly and needs C support. class InterpreterRuntime: AllStatic { friend class BytecodeClosure; // for method and bcp friend class PrintingClosure; // for method and bcp private: // Helper functions to access current interpreter state static frame last_frame(JavaThread *thread) { return thread->last_frame(); } static methodOop method(JavaThread *thread) { return last_frame(thread).interpreter_frame_method(); } static address bcp(JavaThread *thread) { return last_frame(thread).interpreter_frame_bcp(); } static int bci(JavaThread *thread) { return last_frame(thread).interpreter_frame_bci(); } static void set_bcp_and_mdp(address bcp, JavaThread*thread); static Bytecodes::Code code(JavaThread *thread) { // pass method to avoid calling unsafe bcp_to_method (partial fix 4926272) return Bytecodes::code_at(bcp(thread), method(thread)); } static bool already_resolved(JavaThread *thread) { return cache_entry(thread)->is_resolved(code(thread)); } static Bytecode* bytecode(JavaThread *thread) { return Bytecode_at(bcp(thread)); } static int get_index_u1(JavaThread *thread, Bytecodes::Code bc) { return bytecode(thread)->get_index_u1(bc); } static int get_index_u2(JavaThread *thread, Bytecodes::Code bc) { return bytecode(thread)->get_index_u2(bc); } static int get_index_u2_cpcache(JavaThread *thread, Bytecodes::Code bc) { return bytecode(thread)->get_index_u2_cpcache(bc); } static int number_of_dimensions(JavaThread *thread) { return bcp(thread)[3]; } static ConstantPoolCacheEntry* cache_entry_at(JavaThread *thread, int i) { return method(thread)->constants()->cache()->entry_at(i); } static ConstantPoolCacheEntry* cache_entry(JavaThread *thread) { return cache_entry_at(thread, Bytes::get_native_u2(bcp(thread) + 1)); } static void note_trap(JavaThread *thread, int reason, TRAPS); // Inner work method for Interpreter's frequency counter overflow static nmethod* frequency_counter_overflow_inner(JavaThread* thread, address branch_bcp); public: // Constants static void ldc (JavaThread* thread, bool wide); static void resolve_ldc (JavaThread* thread, Bytecodes::Code bytecode); // Allocation static void _new (JavaThread* thread, constantPoolOopDesc* pool, int index); static void newarray (JavaThread* thread, BasicType type, jint size); static void anewarray (JavaThread* thread, constantPoolOopDesc* pool, int index, jint size); static void multianewarray(JavaThread* thread, jint* first_size_address); static void register_finalizer(JavaThread* thread, oopDesc* obj); // Quicken instance-of and check-cast bytecodes static void quicken_io_cc(JavaThread* thread); // Exceptions thrown by the interpreter static void throw_AbstractMethodError(JavaThread* thread); static void throw_IncompatibleClassChangeError(JavaThread* thread); static void throw_StackOverflowError(JavaThread* thread); static void throw_ArrayIndexOutOfBoundsException(JavaThread* thread, char* name, jint index); static void throw_ClassCastException(JavaThread* thread, oopDesc* obj); static void throw_WrongMethodTypeException(JavaThread* thread, oopDesc* mtype = NULL, oopDesc* mhandle = NULL); static void create_exception(JavaThread* thread, char* name, char* message); static void create_klass_exception(JavaThread* thread, char* name, oopDesc* obj); static address exception_handler_for_exception(JavaThread* thread, oopDesc* exception); static void throw_pending_exception(JavaThread* thread); // Statics & fields static void resolve_get_put(JavaThread* thread, Bytecodes::Code bytecode); // Synchronization static void monitorenter(JavaThread* thread, BasicObjectLock* elem); static void monitorexit (JavaThread* thread, BasicObjectLock* elem); static void throw_illegal_monitor_state_exception(JavaThread* thread); static void new_illegal_monitor_state_exception(JavaThread* thread); // Calls static void resolve_invoke (JavaThread* thread, Bytecodes::Code bytecode); static void resolve_invokedynamic(JavaThread* thread); // Breakpoints static void _breakpoint(JavaThread* thread, methodOopDesc* method, address bcp); static Bytecodes::Code get_original_bytecode_at(JavaThread* thread, methodOopDesc* method, address bcp); static void set_original_bytecode_at(JavaThread* thread, methodOopDesc* method, address bcp, Bytecodes::Code new_code); static bool is_breakpoint(JavaThread *thread) { return Bytecodes::code_or_bp_at(bcp(thread)) == Bytecodes::_breakpoint; } // Safepoints static void at_safepoint(JavaThread* thread); // Debugger support static void post_field_access(JavaThread *thread, oopDesc* obj, ConstantPoolCacheEntry *cp_entry); static void post_field_modification(JavaThread *thread, oopDesc* obj, ConstantPoolCacheEntry *cp_entry, jvalue *value); static void post_method_entry(JavaThread *thread); static void post_method_exit (JavaThread *thread); static int interpreter_contains(address pc); // Native signature handlers static void prepare_native_call(JavaThread* thread, methodOopDesc* method); static address slow_signature_handler(JavaThread* thread, methodOopDesc* method, intptr_t* from, intptr_t* to); #if defined(IA32) || defined(AMD64) // Popframe support (only needed on x86 and AMD64) static void popframe_move_outgoing_args(JavaThread* thread, void* src_address, void* dest_address); #endif // Platform dependent stuff #include "incls/_interpreterRT_pd.hpp.incl" // Interpreter's frequency counter overflow static nmethod* frequency_counter_overflow(JavaThread* thread, address branch_bcp); // Interpreter profiling support static jint bcp_to_di(methodOopDesc* method, address cur_bcp); static jint profile_method(JavaThread* thread, address cur_bcp); static void update_mdp_for_ret(JavaThread* thread, int bci); #ifdef ASSERT static void verify_mdp(methodOopDesc* method, address bcp, address mdp); #endif // ASSERT }; class SignatureHandlerLibrary: public AllStatic { public: enum { buffer_size = 1*K }; // the size of the temporary code buffer enum { blob_size = 32*K }; // the size of a handler code blob. private: static BufferBlob* _handler_blob; // the current buffer blob containing the generated handlers static address _handler; // next available address within _handler_blob; static GrowableArray<uint64_t>* _fingerprints; // the fingerprint collection static GrowableArray<address>* _handlers; // the corresponding handlers static address _buffer; // the temporary code buffer static address set_handler_blob(); static void initialize(); static address set_handler(CodeBuffer* buffer); static void pd_set_handler(address handler); public: static void add(methodHandle method); };