mirror of
https://github.com/openjdk/jdk.git
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eb73cf4739
After mechanically merging changes, some by-hand adjustments are needed. Reviewed-by: ysr
639 lines
28 KiB
C++
639 lines
28 KiB
C++
/*
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* Copyright 1997-2008 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*
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*/
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// This class is used internally by nmethods, to cache
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// exception/pc/handler information.
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class ExceptionCache : public CHeapObj {
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friend class VMStructs;
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private:
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static address _unwind_handler;
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enum { cache_size = 16 };
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klassOop _exception_type;
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address _pc[cache_size];
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address _handler[cache_size];
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int _count;
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ExceptionCache* _next;
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address pc_at(int index) { assert(index >= 0 && index < count(),""); return _pc[index]; }
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void set_pc_at(int index, address a) { assert(index >= 0 && index < cache_size,""); _pc[index] = a; }
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address handler_at(int index) { assert(index >= 0 && index < count(),""); return _handler[index]; }
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void set_handler_at(int index, address a) { assert(index >= 0 && index < cache_size,""); _handler[index] = a; }
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int count() { return _count; }
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void increment_count() { _count++; }
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public:
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ExceptionCache(Handle exception, address pc, address handler);
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klassOop exception_type() { return _exception_type; }
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klassOop* exception_type_addr() { return &_exception_type; }
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ExceptionCache* next() { return _next; }
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void set_next(ExceptionCache *ec) { _next = ec; }
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address match(Handle exception, address pc);
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bool match_exception_with_space(Handle exception) ;
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address test_address(address addr);
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bool add_address_and_handler(address addr, address handler) ;
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static address unwind_handler() { return _unwind_handler; }
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};
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// cache pc descs found in earlier inquiries
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class PcDescCache VALUE_OBJ_CLASS_SPEC {
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friend class VMStructs;
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private:
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enum { cache_size = 4 };
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PcDesc* _last_pc_desc; // most recent pc_desc found
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PcDesc* _pc_descs[cache_size]; // last cache_size pc_descs found
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public:
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PcDescCache() { debug_only(_last_pc_desc = NULL); }
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void reset_to(PcDesc* initial_pc_desc);
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PcDesc* find_pc_desc(int pc_offset, bool approximate);
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void add_pc_desc(PcDesc* pc_desc);
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PcDesc* last_pc_desc() { return _last_pc_desc; }
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};
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// nmethods (native methods) are the compiled code versions of Java methods.
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struct nmFlags {
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friend class VMStructs;
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unsigned int version:8; // version number (0 = first version)
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unsigned int level:4; // optimization level
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unsigned int age:4; // age (in # of sweep steps)
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unsigned int state:2; // {alive, zombie, unloaded)
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unsigned int isUncommonRecompiled:1; // recompiled because of uncommon trap?
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unsigned int isToBeRecompiled:1; // to be recompiled as soon as it matures
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unsigned int hasFlushedDependencies:1; // Used for maintenance of dependencies
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unsigned int markedForReclamation:1; // Used by NMethodSweeper
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unsigned int has_unsafe_access:1; // May fault due to unsafe access.
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void clear();
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};
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// A 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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// [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 Dependencies;
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class ExceptionHandlerTable;
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class ImplicitExceptionTable;
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class AbstractCompiler;
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class xmlStream;
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class nmethod : public CodeBlob {
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friend class VMStructs;
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friend class NMethodSweeper;
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friend class CodeCache; // non-perm oops
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private:
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// Shared fields for all nmethod's
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static int _zombie_instruction_size;
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methodOop _method;
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int _entry_bci; // != InvocationEntryBci if this nmethod is an on-stack replacement method
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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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nmethod* _scavenge_root_link; // from CodeCache::scavenge_root_nmethods
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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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AbstractCompiler* _compiler; // The compiler which compiled this nmethod
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// Offsets for different nmethod parts
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int _exception_offset;
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// All deoptee's will resume execution at this location described by this offset
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int _deoptimize_offset;
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#ifdef HAVE_DTRACE_H
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int _trap_offset;
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#endif // def HAVE_DTRACE_H
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int _stub_offset;
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int _consts_offset;
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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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// 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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// 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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nmFlags flags; // various flags to keep track of nmethod state
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bool _markedForDeoptimization; // Used for stack deoptimization
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enum { alive = 0,
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not_entrant = 1, // uncommon trap has happened but activations may still exist
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zombie = 2,
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unloaded = 3 };
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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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jbyte _scavenge_root_state;
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NOT_PRODUCT(bool _has_debug_info; )
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// Nmethod Flushing lock (if non-zero, then the nmethod is not removed)
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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 is 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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long _stack_traversal_mark;
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ExceptionCache *_exception_cache;
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PcDescCache _pc_desc_cache;
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// These are only 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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ByteSize _compiled_synchronized_native_basic_lock_owner_sp_offset;
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ByteSize _compiled_synchronized_native_basic_lock_sp_offset;
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friend class nmethodLocker;
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// For native wrappers
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nmethod(methodOop method,
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int nmethod_size,
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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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#ifdef HAVE_DTRACE_H
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// For native wrappers
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nmethod(methodOop method,
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int nmethod_size,
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CodeOffsets* offsets,
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CodeBuffer *code_buffer,
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int frame_size);
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#endif // def HAVE_DTRACE_H
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// Creation support
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nmethod(methodOop method,
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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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// helper methods
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void* operator new(size_t size, int nmethod_size);
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const char* reloc_string_for(u_char* begin, u_char* end);
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void make_not_entrant_or_zombie(int state);
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void inc_decompile_count();
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// used to check that writes to nmFlags are done consistently.
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static void check_safepoint() PRODUCT_RETURN;
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// Used to manipulate the exception cache
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void add_exception_cache_entry(ExceptionCache* new_entry);
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ExceptionCache* exception_cache_entry_for_exception(Handle exception);
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// Inform external interfaces that a compiled method has been unloaded
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inline void post_compiled_method_unload();
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public:
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// create nmethod with entry_bci
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static nmethod* new_nmethod(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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static nmethod* new_native_nmethod(methodHandle method,
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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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#ifdef HAVE_DTRACE_H
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// The method we generate for a dtrace probe has to look
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// like an nmethod as far as the rest of the system is concerned
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// which is somewhat unfortunate.
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static nmethod* new_dtrace_nmethod(methodHandle method,
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CodeBuffer *code_buffer,
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int vep_offset,
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int trap_offset,
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int frame_complete,
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int frame_size);
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int trap_offset() const { return _trap_offset; }
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address trap_address() const { return code_begin() + _trap_offset; }
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#endif // def HAVE_DTRACE_H
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// accessors
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methodOop method() const { return _method; }
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AbstractCompiler* compiler() const { return _compiler; }
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#ifndef PRODUCT
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bool has_debug_info() const { return _has_debug_info; }
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void set_has_debug_info(bool f) { _has_debug_info = false; }
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#endif // NOT PRODUCT
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// type info
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bool is_nmethod() const { return true; }
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bool is_java_method() const { return !method()->is_native(); }
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bool is_native_method() const { return method()->is_native(); }
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bool is_osr_method() const { return _entry_bci != InvocationEntryBci; }
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bool is_compiled_by_c1() const;
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bool is_compiled_by_c2() const;
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// boundaries for different parts
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address code_begin () const { return _entry_point; }
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address code_end () const { return header_begin() + _stub_offset ; }
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address exception_begin () const { return header_begin() + _exception_offset ; }
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address deopt_handler_begin() const { return header_begin() + _deoptimize_offset ; }
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address stub_begin () const { return header_begin() + _stub_offset ; }
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address stub_end () const { return header_begin() + _consts_offset ; }
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address consts_begin () const { return header_begin() + _consts_offset ; }
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address consts_end () const { return header_begin() + _scopes_data_offset ; }
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address scopes_data_begin () const { return header_begin() + _scopes_data_offset ; }
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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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int code_size () const { return code_end () - code_begin (); }
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int stub_size () const { return stub_end () - stub_begin (); }
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int consts_size () const { return consts_end () - consts_begin (); }
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int scopes_data_size () const { return scopes_data_end () - scopes_data_begin (); }
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int scopes_pcs_size () const { return (intptr_t)scopes_pcs_end () - (intptr_t)scopes_pcs_begin (); }
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int dependencies_size () const { return dependencies_end () - dependencies_begin (); }
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int handler_table_size() const { return handler_table_end() - handler_table_begin(); }
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int nul_chk_table_size() const { return nul_chk_table_end() - nul_chk_table_begin(); }
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int total_size () const;
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bool code_contains (address addr) const { return code_begin () <= addr && addr < code_end (); }
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bool stub_contains (address addr) const { return stub_begin () <= addr && addr < stub_end (); }
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bool consts_contains (address addr) const { return consts_begin () <= addr && addr < consts_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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bool handler_table_contains(address addr) const { return handler_table_begin() <= addr && addr < handler_table_end(); }
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bool nul_chk_table_contains(address addr) const { return nul_chk_table_begin() <= addr && addr < nul_chk_table_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 flags.state == alive; }
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bool is_alive() const { return flags.state == alive || flags.state == not_entrant; }
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bool is_not_entrant() const { return flags.state == not_entrant; }
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bool is_zombie() const { return flags.state == zombie; }
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bool is_unloaded() const { return flags.state == unloaded; }
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// Make the nmethod non entrant. The nmethod will continue to be alive.
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// It is used when an uncommon trap happens.
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void make_not_entrant() { make_not_entrant_or_zombie(not_entrant); }
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void make_zombie() { 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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bool is_marked_for_deoptimization() const { return _markedForDeoptimization; }
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void mark_for_deoptimization() { _markedForDeoptimization = true; }
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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 flags.hasFlushedDependencies; }
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void set_has_flushed_dependencies() {
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check_safepoint();
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assert(!has_flushed_dependencies(), "should only happen once");
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flags.hasFlushedDependencies = 1;
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}
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bool is_marked_for_reclamation() const { return flags.markedForReclamation; }
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void mark_for_reclamation() { check_safepoint(); flags.markedForReclamation = 1; }
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void unmark_for_reclamation() { check_safepoint(); flags.markedForReclamation = 0; }
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bool has_unsafe_access() const { return flags.has_unsafe_access; }
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void set_has_unsafe_access(bool z) { flags.has_unsafe_access = z; }
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int level() const { return flags.level; }
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void set_level(int newLevel) { check_safepoint(); flags.level = newLevel; }
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int comp_level() const { return _comp_level; }
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int version() const { return flags.version; }
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void set_version(int v);
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// Non-perm 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 { npl_on_list = 0x01, npl_marked = 0x10 };
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void set_on_scavenge_root_list() { _scavenge_root_state = npl_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 |= npl_marked; }
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void clear_scavenge_root_marked() { _scavenge_root_state &= ~npl_marked; }
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bool scavenge_root_not_marked() { return (_scavenge_root_state &~ npl_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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// Exception cache support
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ExceptionCache* exception_cache() const { return _exception_cache; }
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void set_exception_cache(ExceptionCache *ec) { _exception_cache = ec; }
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address handler_for_exception_and_pc(Handle exception, address pc);
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void add_handler_for_exception_and_pc(Handle exception, address pc, address handler);
|
|
void remove_from_exception_cache(ExceptionCache* ec);
|
|
|
|
// implicit exceptions support
|
|
address continuation_for_implicit_exception(address pc);
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|
|
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// On-stack replacement support
|
|
int osr_entry_bci() const { assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); return _entry_bci; }
|
|
address osr_entry() const { assert(_entry_bci != InvocationEntryBci, "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; }
|
|
void set_osr_link(nmethod *n) { _osr_link = n; }
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|
|
|
// tells whether frames described by this nmethod can be deoptimized
|
|
// note: native wrappers cannot be deoptimized.
|
|
bool can_be_deoptimized() const { return is_java_method(); }
|
|
|
|
// Inline cache support
|
|
void clear_inline_caches();
|
|
void cleanup_inline_caches();
|
|
bool inlinecache_check_contains(address addr) const {
|
|
return (addr >= instructions_begin() && addr < verified_entry_point());
|
|
}
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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:
|
|
void flush();
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|
|
|
public:
|
|
// If returning true, it is unsafe to remove this nmethod even though it is a zombie
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|
// nmethod, since the VM might have a reference to it. Should only be called from a safepoint.
|
|
bool is_locked_by_vm() const { return _lock_count >0; }
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|
|
|
// See comment at definition of _last_seen_on_stack
|
|
void mark_as_seen_on_stack();
|
|
bool can_not_entrant_be_converted();
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|
|
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// Evolution support. We make old (discarded) compiled methods point to new methodOops.
|
|
void set_method(methodOop method) { _method = method; }
|
|
|
|
// GC support
|
|
void do_unloading(BoolObjectClosure* is_alive, OopClosure* keep_alive,
|
|
bool unloading_occurred);
|
|
bool can_unload(BoolObjectClosure* is_alive, OopClosure* keep_alive,
|
|
oop* root, bool unloading_occurred);
|
|
|
|
void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map,
|
|
OopClosure* f);
|
|
virtual void oops_do(OopClosure* f) { oops_do(f, false); }
|
|
void oops_do(OopClosure* f, bool do_strong_roots_only);
|
|
bool detect_scavenge_root_oops();
|
|
void verify_scavenge_root_oops() PRODUCT_RETURN;
|
|
|
|
bool test_set_oops_do_mark();
|
|
static void oops_do_marking_prologue();
|
|
static void oops_do_marking_epilogue();
|
|
static bool oops_do_marking_is_active() { return _oops_do_mark_nmethods != NULL; }
|
|
DEBUG_ONLY(bool test_oops_do_mark() { return _oops_do_mark_link != NULL; })
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|
|
|
// ScopeDesc for an instruction
|
|
ScopeDesc* scope_desc_at(address pc);
|
|
|
|
private:
|
|
ScopeDesc* scope_desc_in(address begin, address end);
|
|
|
|
address* orig_pc_addr(const frame* fr ) { return (address*) ((address)fr->unextended_sp() + _orig_pc_offset); }
|
|
|
|
PcDesc* find_pc_desc_internal(address pc, bool approximate);
|
|
|
|
PcDesc* find_pc_desc(address pc, bool approximate) {
|
|
PcDesc* desc = _pc_desc_cache.last_pc_desc();
|
|
if (desc != NULL && desc->pc_offset() == pc - instructions_begin()) {
|
|
return desc;
|
|
}
|
|
return find_pc_desc_internal(pc, approximate);
|
|
}
|
|
|
|
public:
|
|
// ScopeDesc retrieval operation
|
|
PcDesc* pc_desc_at(address pc) { return find_pc_desc(pc, false); }
|
|
// pc_desc_near returns the first PcDesc at or after the givne pc.
|
|
PcDesc* pc_desc_near(address pc) { return find_pc_desc(pc, true); }
|
|
|
|
public:
|
|
// copying of debugging information
|
|
void copy_scopes_pcs(PcDesc* pcs, int count);
|
|
void copy_scopes_data(address buffer, int size);
|
|
|
|
// deopt
|
|
// return true is the pc is one would expect if the frame is being deopted.
|
|
bool is_deopt_pc(address pc);
|
|
// Accessor/mutator for the original pc of a frame before a frame was deopted.
|
|
address get_original_pc(const frame* fr) { return *orig_pc_addr(fr); }
|
|
void set_original_pc(const frame* fr, address pc) { *orig_pc_addr(fr) = pc; }
|
|
|
|
// jvmti support:
|
|
void post_compiled_method_load_event();
|
|
|
|
// verify operations
|
|
void verify();
|
|
void verify_scopes();
|
|
void verify_interrupt_point(address interrupt_point);
|
|
|
|
// printing support
|
|
void print() const;
|
|
void print_code();
|
|
void print_relocations() PRODUCT_RETURN;
|
|
void print_pcs() PRODUCT_RETURN;
|
|
void print_scopes() PRODUCT_RETURN;
|
|
void print_dependencies() PRODUCT_RETURN;
|
|
void print_value_on(outputStream* st) const PRODUCT_RETURN;
|
|
void print_calls(outputStream* st) PRODUCT_RETURN;
|
|
void print_handler_table() PRODUCT_RETURN;
|
|
void print_nul_chk_table() PRODUCT_RETURN;
|
|
void print_nmethod(bool print_code);
|
|
|
|
void print_on(outputStream* st, const char* title) const;
|
|
|
|
// Logging
|
|
void log_identity(xmlStream* log) const;
|
|
void log_new_nmethod() const;
|
|
void log_state_change(int state) const;
|
|
|
|
// Prints a comment for one native instruction (reloc info, pc desc)
|
|
void print_code_comment_on(outputStream* st, int column, address begin, address end);
|
|
static void print_statistics() PRODUCT_RETURN;
|
|
|
|
// Compiler task identification. Note that all OSR methods
|
|
// are numbered in an independent sequence if CICountOSR is true,
|
|
// and native method wrappers are also numbered independently if
|
|
// CICountNative is true.
|
|
int compile_id() const { return _compile_id; }
|
|
const char* compile_kind() const;
|
|
|
|
// For debugging
|
|
// CompiledIC* IC_at(char* p) const;
|
|
// PrimitiveIC* primitiveIC_at(char* p) const;
|
|
oop embeddedOop_at(address p);
|
|
|
|
// tells if any of this method's dependencies have been invalidated
|
|
// (this is expensive!)
|
|
bool check_all_dependencies();
|
|
|
|
// tells if this compiled method is dependent on the given changes,
|
|
// and the changes have invalidated it
|
|
bool check_dependency_on(DepChange& changes);
|
|
|
|
// Evolution support. Tells if this compiled method is dependent on any of
|
|
// methods m() of class dependee, such that if m() in dependee is replaced,
|
|
// this compiled method will have to be deoptimized.
|
|
bool is_evol_dependent_on(klassOop dependee);
|
|
|
|
// Fast breakpoint support. Tells if this compiled method is
|
|
// dependent on the given method. Returns true if this nmethod
|
|
// corresponds to the given method as well.
|
|
bool is_dependent_on_method(methodOop dependee);
|
|
|
|
// is it ok to patch at address?
|
|
bool is_patchable_at(address instr_address);
|
|
|
|
// UseBiasedLocking support
|
|
ByteSize compiled_synchronized_native_basic_lock_owner_sp_offset() {
|
|
return _compiled_synchronized_native_basic_lock_owner_sp_offset;
|
|
}
|
|
ByteSize compiled_synchronized_native_basic_lock_sp_offset() {
|
|
return _compiled_synchronized_native_basic_lock_sp_offset;
|
|
}
|
|
|
|
// support for code generation
|
|
static int verified_entry_point_offset() { return offset_of(nmethod, _verified_entry_point); }
|
|
static int osr_entry_point_offset() { return offset_of(nmethod, _osr_entry_point); }
|
|
static int entry_bci_offset() { return offset_of(nmethod, _entry_bci); }
|
|
|
|
};
|
|
|
|
// Locks an nmethod so its code will not get removed, even if it is a zombie/not_entrant method
|
|
class nmethodLocker : public StackObj {
|
|
nmethod* _nm;
|
|
|
|
static void lock_nmethod(nmethod* nm); // note: nm can be NULL
|
|
static void unlock_nmethod(nmethod* nm); // (ditto)
|
|
|
|
public:
|
|
nmethodLocker(address pc); // derive nm from pc
|
|
nmethodLocker(nmethod *nm) { _nm = nm; lock_nmethod(_nm); }
|
|
nmethodLocker() { _nm = NULL; }
|
|
~nmethodLocker() { unlock_nmethod(_nm); }
|
|
|
|
nmethod* code() { return _nm; }
|
|
void set_code(nmethod* new_nm) {
|
|
unlock_nmethod(_nm); // note: This works even if _nm==new_nm.
|
|
_nm = new_nm;
|
|
lock_nmethod(_nm);
|
|
}
|
|
};
|