636 lines
27 KiB
C++
636 lines
27 KiB
C++
/*
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* Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#ifndef SHARE_VM_CODE_NMETHOD_HPP
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#define SHARE_VM_CODE_NMETHOD_HPP
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#include "code/compiledMethod.hpp"
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class DepChange;
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class DirectiveSet;
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// nmethods (native methods) are the compiled code versions of Java methods.
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//
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// An nmethod contains:
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// - header (the nmethod structure)
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// [Relocation]
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// - relocation information
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// - constant part (doubles, longs and floats used in nmethod)
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// - oop table
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// [Code]
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// - code body
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// - exception handler
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// - stub code
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// [Debugging information]
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// - oop array
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// - data array
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// - pcs
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// [Exception handler table]
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// - handler entry point array
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// [Implicit Null Pointer exception table]
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// - implicit null table array
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class nmethod : public CompiledMethod {
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friend class VMStructs;
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friend class JVMCIVMStructs;
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friend class NMethodSweeper;
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friend class CodeCache; // scavengable oops
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private:
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// Shared fields for all nmethod's
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int _entry_bci; // != InvocationEntryBci if this nmethod is an on-stack replacement method
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jmethodID _jmethod_id; // Cache of method()->jmethod_id()
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#if INCLUDE_JVMCI
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// Needed to keep nmethods alive that are not the default nmethod for the associated Method.
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oop _jvmci_installed_code;
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oop _speculation_log;
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#endif
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// To support simple linked-list chaining of nmethods:
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nmethod* _osr_link; // from InstanceKlass::osr_nmethods_head
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static nmethod* volatile _oops_do_mark_nmethods;
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nmethod* volatile _oops_do_mark_link;
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// offsets for entry points
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address _entry_point; // entry point with class check
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address _verified_entry_point; // entry point without class check
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address _osr_entry_point; // entry point for on stack replacement
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// Offsets for different nmethod parts
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int _exception_offset;
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// Offset of the unwind handler if it exists
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int _unwind_handler_offset;
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int _consts_offset;
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int _stub_offset;
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int _oops_offset; // offset to where embedded oop table begins (inside data)
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int _metadata_offset; // embedded meta data table
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int _scopes_data_offset;
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int _scopes_pcs_offset;
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int _dependencies_offset;
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int _handler_table_offset;
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int _nul_chk_table_offset;
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int _nmethod_end_offset;
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int code_offset() const { return (address) code_begin() - header_begin(); }
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// location in frame (offset for sp) that deopt can store the original
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// pc during a deopt.
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int _orig_pc_offset;
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int _compile_id; // which compilation made this nmethod
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int _comp_level; // compilation level
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// protected by CodeCache_lock
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bool _has_flushed_dependencies; // Used for maintenance of dependencies (CodeCache_lock)
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// used by jvmti to track if an unload event has been posted for this nmethod.
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bool _unload_reported;
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// Protected by Patching_lock
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volatile unsigned char _state; // {in_use, not_entrant, zombie, unloaded}
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#ifdef ASSERT
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bool _oops_are_stale; // indicates that it's no longer safe to access oops section
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#endif
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jbyte _scavenge_root_state;
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#if INCLUDE_RTM_OPT
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// RTM state at compile time. Used during deoptimization to decide
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// whether to restart collecting RTM locking abort statistic again.
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RTMState _rtm_state;
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#endif
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// Nmethod Flushing lock. If non-zero, then the nmethod is not removed
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// and is not made into a zombie. However, once the nmethod is made into
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// a zombie, it will be locked one final time if CompiledMethodUnload
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// event processing needs to be done.
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volatile jint _lock_count;
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// not_entrant method removal. Each mark_sweep pass will update
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// this mark to current sweep invocation count if it is seen on the
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// stack. An not_entrant method can be removed when there are no
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// more activations, i.e., when the _stack_traversal_mark is less than
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// current sweep traversal index.
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volatile long _stack_traversal_mark;
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// The _hotness_counter indicates the hotness of a method. The higher
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// the value the hotter the method. The hotness counter of a nmethod is
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// set to [(ReservedCodeCacheSize / (1024 * 1024)) * 2] each time the method
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// is active while stack scanning (mark_active_nmethods()). The hotness
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// counter is decreased (by 1) while sweeping.
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int _hotness_counter;
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// These are used for compiled synchronized native methods to
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// locate the owner and stack slot for the BasicLock so that we can
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// properly revoke the bias of the owner if necessary. They are
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// needed because there is no debug information for compiled native
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// wrappers and the oop maps are insufficient to allow
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// frame::retrieve_receiver() to work. Currently they are expected
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// to be byte offsets from the Java stack pointer for maximum code
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// sharing between platforms. Note that currently biased locking
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// will never cause Class instances to be biased but this code
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// handles the static synchronized case as well.
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// JVMTI's GetLocalInstance() also uses these offsets to find the receiver
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// for non-static native wrapper frames.
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ByteSize _native_receiver_sp_offset;
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ByteSize _native_basic_lock_sp_offset;
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friend class nmethodLocker;
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// For native wrappers
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nmethod(Method* method,
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CompilerType type,
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int nmethod_size,
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int compile_id,
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CodeOffsets* offsets,
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CodeBuffer *code_buffer,
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int frame_size,
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ByteSize basic_lock_owner_sp_offset, /* synchronized natives only */
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ByteSize basic_lock_sp_offset, /* synchronized natives only */
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OopMapSet* oop_maps);
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// Creation support
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nmethod(Method* method,
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CompilerType type,
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int nmethod_size,
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int compile_id,
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int entry_bci,
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CodeOffsets* offsets,
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int orig_pc_offset,
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DebugInformationRecorder *recorder,
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Dependencies* dependencies,
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CodeBuffer *code_buffer,
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int frame_size,
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OopMapSet* oop_maps,
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ExceptionHandlerTable* handler_table,
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ImplicitExceptionTable* nul_chk_table,
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AbstractCompiler* compiler,
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int comp_level
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#if INCLUDE_JVMCI
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, Handle installed_code,
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Handle speculation_log
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#endif
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);
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// helper methods
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void* operator new(size_t size, int nmethod_size, int comp_level) throw();
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const char* reloc_string_for(u_char* begin, u_char* end);
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// Returns true if this thread changed the state of the nmethod or
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// false if another thread performed the transition.
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bool make_not_entrant_or_zombie(unsigned int state);
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bool make_entrant() { Unimplemented(); return false; }
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void inc_decompile_count();
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// Inform external interfaces that a compiled method has been unloaded
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void post_compiled_method_unload();
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// Initailize fields to their default values
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void init_defaults();
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// Offsets
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int content_offset() const { return content_begin() - header_begin(); }
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int data_offset() const { return _data_offset; }
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address header_end() const { return (address) header_begin() + header_size(); }
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public:
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// create nmethod with entry_bci
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static nmethod* new_nmethod(const methodHandle& method,
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int compile_id,
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int entry_bci,
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CodeOffsets* offsets,
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int orig_pc_offset,
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DebugInformationRecorder* recorder,
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Dependencies* dependencies,
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CodeBuffer *code_buffer,
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int frame_size,
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OopMapSet* oop_maps,
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ExceptionHandlerTable* handler_table,
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ImplicitExceptionTable* nul_chk_table,
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AbstractCompiler* compiler,
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int comp_level
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#if INCLUDE_JVMCI
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, Handle installed_code = Handle(),
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Handle speculation_log = Handle()
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#endif
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);
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static nmethod* new_native_nmethod(const methodHandle& method,
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int compile_id,
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CodeBuffer *code_buffer,
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int vep_offset,
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int frame_complete,
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int frame_size,
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ByteSize receiver_sp_offset,
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ByteSize basic_lock_sp_offset,
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OopMapSet* oop_maps);
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// type info
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bool is_nmethod() const { return true; }
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bool is_osr_method() const { return _entry_bci != InvocationEntryBci; }
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// boundaries for different parts
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address consts_begin () const { return header_begin() + _consts_offset ; }
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address consts_end () const { return code_begin() ; }
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address stub_begin () const { return header_begin() + _stub_offset ; }
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address stub_end () const { return header_begin() + _oops_offset ; }
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address exception_begin () const { return header_begin() + _exception_offset ; }
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address unwind_handler_begin () const { return _unwind_handler_offset != -1 ? (header_begin() + _unwind_handler_offset) : NULL; }
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oop* oops_begin () const { return (oop*) (header_begin() + _oops_offset) ; }
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oop* oops_end () const { return (oop*) (header_begin() + _metadata_offset) ; }
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Metadata** metadata_begin () const { return (Metadata**) (header_begin() + _metadata_offset) ; }
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Metadata** metadata_end () const { return (Metadata**) _scopes_data_begin; }
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address scopes_data_end () const { return header_begin() + _scopes_pcs_offset ; }
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PcDesc* scopes_pcs_begin () const { return (PcDesc*)(header_begin() + _scopes_pcs_offset ); }
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PcDesc* scopes_pcs_end () const { return (PcDesc*)(header_begin() + _dependencies_offset) ; }
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address dependencies_begin () const { return header_begin() + _dependencies_offset ; }
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address dependencies_end () const { return header_begin() + _handler_table_offset ; }
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address handler_table_begin () const { return header_begin() + _handler_table_offset ; }
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address handler_table_end () const { return header_begin() + _nul_chk_table_offset ; }
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address nul_chk_table_begin () const { return header_begin() + _nul_chk_table_offset ; }
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address nul_chk_table_end () const { return header_begin() + _nmethod_end_offset ; }
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// Sizes
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int oops_size () const { return (address) oops_end () - (address) oops_begin (); }
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int metadata_size () const { return (address) metadata_end () - (address) metadata_begin (); }
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int dependencies_size () const { return dependencies_end () - dependencies_begin (); }
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int oops_count() const { assert(oops_size() % oopSize == 0, ""); return (oops_size() / oopSize) + 1; }
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int metadata_count() const { assert(metadata_size() % wordSize == 0, ""); return (metadata_size() / wordSize) + 1; }
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int total_size () const;
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void dec_hotness_counter() { _hotness_counter--; }
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void set_hotness_counter(int val) { _hotness_counter = val; }
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int hotness_counter() const { return _hotness_counter; }
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// Containment
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bool oops_contains (oop* addr) const { return oops_begin () <= addr && addr < oops_end (); }
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bool metadata_contains (Metadata** addr) const { return metadata_begin () <= addr && addr < metadata_end (); }
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bool scopes_data_contains (address addr) const { return scopes_data_begin () <= addr && addr < scopes_data_end (); }
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bool scopes_pcs_contains (PcDesc* addr) const { return scopes_pcs_begin () <= addr && addr < scopes_pcs_end (); }
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// entry points
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address entry_point() const { return _entry_point; } // normal entry point
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address verified_entry_point() const { return _verified_entry_point; } // if klass is correct
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// flag accessing and manipulation
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bool is_in_use() const { return _state == in_use; }
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bool is_alive() const { unsigned char s = _state; return s < zombie; }
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bool is_not_entrant() const { return _state == not_entrant; }
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bool is_zombie() const { return _state == zombie; }
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bool is_unloaded() const { return _state == unloaded; }
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#if INCLUDE_RTM_OPT
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// rtm state accessing and manipulating
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RTMState rtm_state() const { return _rtm_state; }
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void set_rtm_state(RTMState state) { _rtm_state = state; }
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#endif
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// Make the nmethod non entrant. The nmethod will continue to be
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// alive. It is used when an uncommon trap happens. Returns true
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// if this thread changed the state of the nmethod or false if
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// another thread performed the transition.
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bool make_not_entrant() {
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assert(!method()->is_method_handle_intrinsic(), "Cannot make MH intrinsic not entrant");
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return make_not_entrant_or_zombie(not_entrant);
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}
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bool make_not_used() { return make_not_entrant(); }
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bool make_zombie() { return make_not_entrant_or_zombie(zombie); }
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// used by jvmti to track if the unload event has been reported
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bool unload_reported() { return _unload_reported; }
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void set_unload_reported() { _unload_reported = true; }
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int get_state() const {
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return _state;
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}
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void make_unloaded(BoolObjectClosure* is_alive, oop cause);
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bool has_dependencies() { return dependencies_size() != 0; }
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void flush_dependencies(BoolObjectClosure* is_alive);
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bool has_flushed_dependencies() { return _has_flushed_dependencies; }
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void set_has_flushed_dependencies() {
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assert(!has_flushed_dependencies(), "should only happen once");
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_has_flushed_dependencies = 1;
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}
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int comp_level() const { return _comp_level; }
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// Support for oops in scopes and relocs:
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// Note: index 0 is reserved for null.
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oop oop_at(int index) const { return index == 0 ? (oop) NULL: *oop_addr_at(index); }
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oop* oop_addr_at(int index) const { // for GC
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// relocation indexes are biased by 1 (because 0 is reserved)
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assert(index > 0 && index <= oops_count(), "must be a valid non-zero index");
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assert(!_oops_are_stale, "oops are stale");
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return &oops_begin()[index - 1];
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}
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// Support for meta data in scopes and relocs:
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// Note: index 0 is reserved for null.
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Metadata* metadata_at(int index) const { return index == 0 ? NULL: *metadata_addr_at(index); }
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Metadata** metadata_addr_at(int index) const { // for GC
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// relocation indexes are biased by 1 (because 0 is reserved)
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assert(index > 0 && index <= metadata_count(), "must be a valid non-zero index");
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return &metadata_begin()[index - 1];
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}
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void copy_values(GrowableArray<jobject>* oops);
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void copy_values(GrowableArray<Metadata*>* metadata);
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// Relocation support
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private:
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void fix_oop_relocations(address begin, address end, bool initialize_immediates);
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inline void initialize_immediate_oop(oop* dest, jobject handle);
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public:
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void fix_oop_relocations(address begin, address end) { fix_oop_relocations(begin, end, false); }
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void fix_oop_relocations() { fix_oop_relocations(NULL, NULL, false); }
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// Scavengable oop support
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bool on_scavenge_root_list() const { return (_scavenge_root_state & 1) != 0; }
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protected:
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enum { sl_on_list = 0x01, sl_marked = 0x10 };
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void set_on_scavenge_root_list() { _scavenge_root_state = sl_on_list; }
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void clear_on_scavenge_root_list() { _scavenge_root_state = 0; }
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// assertion-checking and pruning logic uses the bits of _scavenge_root_state
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#ifndef PRODUCT
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void set_scavenge_root_marked() { _scavenge_root_state |= sl_marked; }
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void clear_scavenge_root_marked() { _scavenge_root_state &= ~sl_marked; }
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bool scavenge_root_not_marked() { return (_scavenge_root_state &~ sl_on_list) == 0; }
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// N.B. there is no positive marked query, and we only use the not_marked query for asserts.
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#endif //PRODUCT
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nmethod* scavenge_root_link() const { return _scavenge_root_link; }
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void set_scavenge_root_link(nmethod *n) { _scavenge_root_link = n; }
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public:
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// Sweeper support
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long stack_traversal_mark() { return _stack_traversal_mark; }
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void set_stack_traversal_mark(long l) { _stack_traversal_mark = l; }
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// implicit exceptions support
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address continuation_for_implicit_exception(address pc);
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// On-stack replacement support
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int osr_entry_bci() const { assert(is_osr_method(), "wrong kind of nmethod"); return _entry_bci; }
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address osr_entry() const { assert(is_osr_method(), "wrong kind of nmethod"); return _osr_entry_point; }
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void invalidate_osr_method();
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nmethod* osr_link() const { return _osr_link; }
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void set_osr_link(nmethod *n) { _osr_link = n; }
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// Verify calls to dead methods have been cleaned.
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void verify_clean_inline_caches();
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// unlink and deallocate this nmethod
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// Only NMethodSweeper class is expected to use this. NMethodSweeper is not
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// expected to use any other private methods/data in this class.
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protected:
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void flush();
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public:
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// When true is returned, it is unsafe to remove this nmethod even if
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// it is a zombie, since the VM or the ServiceThread might still be
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// using it.
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bool is_locked_by_vm() const { return _lock_count >0; }
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// See comment at definition of _last_seen_on_stack
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void mark_as_seen_on_stack();
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bool can_convert_to_zombie();
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// Evolution support. We make old (discarded) compiled methods point to new Method*s.
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void set_method(Method* method) { _method = method; }
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#if INCLUDE_JVMCI
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oop jvmci_installed_code() { return _jvmci_installed_code ; }
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char* jvmci_installed_code_name(char* buf, size_t buflen);
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// Update the state of any InstalledCode instance associated with
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// this nmethod based on the current value of _state.
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void maybe_invalidate_installed_code();
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// Helper function to invalidate InstalledCode instances
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static void invalidate_installed_code(Handle installed_code, TRAPS);
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oop speculation_log() { return _speculation_log ; }
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private:
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void clear_jvmci_installed_code();
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public:
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#endif
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protected:
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virtual bool do_unloading_oops(address low_boundary, BoolObjectClosure* is_alive, bool unloading_occurred);
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#if INCLUDE_JVMCI
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virtual bool do_unloading_jvmci(BoolObjectClosure* is_alive, bool unloading_occurred);
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#endif
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private:
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bool do_unloading_scopes(BoolObjectClosure* is_alive, bool unloading_occurred);
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// Unload a nmethod if the *root object is dead.
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bool can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred);
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bool unload_if_dead_at(RelocIterator *iter_at_oop, BoolObjectClosure* is_alive, bool unloading_occurred);
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public:
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void oops_do(OopClosure* f) { oops_do(f, false); }
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void oops_do(OopClosure* f, bool allow_zombie);
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bool detect_scavenge_root_oops();
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void verify_scavenge_root_oops() PRODUCT_RETURN;
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bool test_set_oops_do_mark();
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static void oops_do_marking_prologue();
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static void oops_do_marking_epilogue();
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static bool oops_do_marking_is_active() { return _oops_do_mark_nmethods != NULL; }
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bool test_oops_do_mark() { return _oops_do_mark_link != NULL; }
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private:
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ScopeDesc* scope_desc_in(address begin, address end);
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address* orig_pc_addr(const frame* fr) { return (address*) ((address)fr->unextended_sp() + _orig_pc_offset); }
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public:
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// copying of debugging information
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void copy_scopes_pcs(PcDesc* pcs, int count);
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void copy_scopes_data(address buffer, int size);
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// Accessor/mutator for the original pc of a frame before a frame was deopted.
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address get_original_pc(const frame* fr) { return *orig_pc_addr(fr); }
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void set_original_pc(const frame* fr, address pc) { *orig_pc_addr(fr) = pc; }
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// jvmti support:
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void post_compiled_method_load_event();
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jmethodID get_and_cache_jmethod_id();
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// verify operations
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void verify();
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void verify_scopes();
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void verify_interrupt_point(address interrupt_point);
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// printing support
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void print() const;
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void print_relocations() PRODUCT_RETURN;
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void print_pcs() PRODUCT_RETURN;
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void print_scopes() PRODUCT_RETURN;
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void print_dependencies() PRODUCT_RETURN;
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void print_value_on(outputStream* st) const PRODUCT_RETURN;
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void print_calls(outputStream* st) PRODUCT_RETURN;
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void print_handler_table() PRODUCT_RETURN;
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void print_nul_chk_table() PRODUCT_RETURN;
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void print_recorded_oops() PRODUCT_RETURN;
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void print_recorded_metadata() PRODUCT_RETURN;
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void maybe_print_nmethod(DirectiveSet* directive);
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void print_nmethod(bool print_code);
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// need to re-define this from CodeBlob else the overload hides it
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virtual void print_on(outputStream* st) const { CodeBlob::print_on(st); }
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void print_on(outputStream* st, const char* msg) const;
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// Logging
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void log_identity(xmlStream* log) const;
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void log_new_nmethod() const;
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void log_state_change() const;
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// Prints block-level comments, including nmethod specific block labels:
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virtual void print_block_comment(outputStream* stream, address block_begin) const {
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print_nmethod_labels(stream, block_begin);
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CodeBlob::print_block_comment(stream, block_begin);
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}
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void print_nmethod_labels(outputStream* stream, address block_begin) const;
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// Prints a comment for one native instruction (reloc info, pc desc)
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void print_code_comment_on(outputStream* st, int column, address begin, address end);
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static void print_statistics() PRODUCT_RETURN;
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// Compiler task identification. Note that all OSR methods
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// are numbered in an independent sequence if CICountOSR is true,
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// and native method wrappers are also numbered independently if
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// CICountNative is true.
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virtual int compile_id() const { return _compile_id; }
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const char* compile_kind() const;
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// tells if any of this method's dependencies have been invalidated
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// (this is expensive!)
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static void check_all_dependencies(DepChange& changes);
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// tells if this compiled method is dependent on the given changes,
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// and the changes have invalidated it
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bool check_dependency_on(DepChange& changes);
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// Evolution support. Tells if this compiled method is dependent on any of
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// methods m() of class dependee, such that if m() in dependee is replaced,
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// this compiled method will have to be deoptimized.
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bool is_evol_dependent_on(Klass* dependee);
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// Fast breakpoint support. Tells if this compiled method is
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// dependent on the given method. Returns true if this nmethod
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// corresponds to the given method as well.
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virtual bool is_dependent_on_method(Method* dependee);
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// is it ok to patch at address?
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bool is_patchable_at(address instr_address);
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// UseBiasedLocking support
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ByteSize native_receiver_sp_offset() {
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return _native_receiver_sp_offset;
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}
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ByteSize native_basic_lock_sp_offset() {
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return _native_basic_lock_sp_offset;
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}
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// support for code generation
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static int verified_entry_point_offset() { return offset_of(nmethod, _verified_entry_point); }
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static int osr_entry_point_offset() { return offset_of(nmethod, _osr_entry_point); }
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static int state_offset() { return offset_of(nmethod, _state); }
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virtual void metadata_do(void f(Metadata*));
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NativeCallWrapper* call_wrapper_at(address call) const;
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NativeCallWrapper* call_wrapper_before(address return_pc) const;
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address call_instruction_address(address pc) const;
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virtual CompiledStaticCall* compiledStaticCall_at(Relocation* call_site) const;
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virtual CompiledStaticCall* compiledStaticCall_at(address addr) const;
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virtual CompiledStaticCall* compiledStaticCall_before(address addr) const;
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};
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// Locks an nmethod so its code will not get removed and it will not
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// be made into a zombie, even if it is a not_entrant method. After the
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// nmethod becomes a zombie, if CompiledMethodUnload event processing
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// needs to be done, then lock_nmethod() is used directly to keep the
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// generated code from being reused too early.
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class nmethodLocker : public StackObj {
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CompiledMethod* _nm;
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public:
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// note: nm can be NULL
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// Only JvmtiDeferredEvent::compiled_method_unload_event()
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// should pass zombie_ok == true.
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static void lock_nmethod(CompiledMethod* nm, bool zombie_ok = false);
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static void unlock_nmethod(CompiledMethod* nm); // (ditto)
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nmethodLocker(address pc); // derive nm from pc
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nmethodLocker(nmethod *nm) { _nm = nm; lock_nmethod(_nm); }
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nmethodLocker(CompiledMethod *nm) {
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_nm = nm;
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lock(_nm);
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}
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static void lock(CompiledMethod* method) {
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if (method == NULL) return;
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lock_nmethod(method);
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}
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static void unlock(CompiledMethod* method) {
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if (method == NULL) return;
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unlock_nmethod(method);
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}
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nmethodLocker() { _nm = NULL; }
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~nmethodLocker() {
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unlock(_nm);
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}
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CompiledMethod* code() { return _nm; }
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void set_code(CompiledMethod* new_nm) {
|
|
unlock(_nm); // note: This works even if _nm==new_nm.
|
|
_nm = new_nm;
|
|
lock(_nm);
|
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}
|
|
};
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#endif // SHARE_VM_CODE_NMETHOD_HPP
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