Mercurial > hg > truffle
view src/share/vm/opto/phase.hpp @ 3249:e1162778c1c8
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
Summary: A referent object that is only weakly reachable at the start of concurrent marking but is re-attached to the strongly reachable object graph during marking may not be marked as live. This can cause the reference object to be processed prematurely and leave dangling pointers to the referent object. Implement a read barrier for the java.lang.ref.Reference::referent field by intrinsifying the Reference.get() method, and intercepting accesses though JNI, reflection, and Unsafe, so that when a non-null referent object is read it is also logged in an SATB buffer.
Reviewed-by: kvn, iveresov, never, tonyp, dholmes
author | johnc |
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date | Thu, 07 Apr 2011 09:53:20 -0700 |
parents | f95d63e2154a |
children | ee138854b3a6 |
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/* * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #ifndef SHARE_VM_OPTO_PHASE_HPP #define SHARE_VM_OPTO_PHASE_HPP #include "libadt/port.hpp" #include "runtime/timer.hpp" class Compile; //------------------------------Phase------------------------------------------ // Most optimizations are done in Phases. Creating a phase does any long // running analysis required, and caches the analysis in internal data // structures. Later the analysis is queried using transform() calls to // guide transforming the program. When the Phase is deleted, so is any // cached analysis info. This basic Phase class mostly contains timing and // memory management code. class Phase : public StackObj { public: enum PhaseNumber { Compiler, // Top-level compiler phase Parser, // Parse bytecodes Remove_Useless, // Remove useless nodes Optimistic, // Optimistic analysis phase GVN, // Pessimistic global value numbering phase Ins_Select, // Instruction selection phase CFG, // Build a CFG BlockLayout, // Linear ordering of blocks Register_Allocation, // Register allocation, duh LIVE, // Dragon-book LIVE range problem StringOpts, // StringBuilder related optimizations Interference_Graph, // Building the IFG Coalesce, // Coalescing copies Ideal_Loop, // Find idealized trip-counted loops Macro_Expand, // Expand macro nodes Peephole, // Apply peephole optimizations last_phase }; protected: enum PhaseNumber _pnum; // Phase number (for stat gathering) #ifndef PRODUCT static int _total_bytes_compiled; // accumulated timers static elapsedTimer _t_totalCompilation; static elapsedTimer _t_methodCompilation; static elapsedTimer _t_stubCompilation; #endif // The next timers used for LogCompilation static elapsedTimer _t_parser; static elapsedTimer _t_escapeAnalysis; static elapsedTimer _t_optimizer; static elapsedTimer _t_idealLoop; static elapsedTimer _t_ccp; static elapsedTimer _t_matcher; static elapsedTimer _t_registerAllocation; static elapsedTimer _t_output; #ifndef PRODUCT static elapsedTimer _t_graphReshaping; static elapsedTimer _t_scheduler; static elapsedTimer _t_blockOrdering; static elapsedTimer _t_macroExpand; static elapsedTimer _t_peephole; static elapsedTimer _t_codeGeneration; static elapsedTimer _t_registerMethod; static elapsedTimer _t_temporaryTimer1; static elapsedTimer _t_temporaryTimer2; static elapsedTimer _t_idealLoopVerify; // Subtimers for _t_optimizer static elapsedTimer _t_iterGVN; static elapsedTimer _t_iterGVN2; // Subtimers for _t_registerAllocation static elapsedTimer _t_ctorChaitin; static elapsedTimer _t_buildIFGphysical; static elapsedTimer _t_computeLive; static elapsedTimer _t_regAllocSplit; static elapsedTimer _t_postAllocCopyRemoval; static elapsedTimer _t_fixupSpills; // Subtimers for _t_output static elapsedTimer _t_instrSched; static elapsedTimer _t_buildOopMaps; #endif public: Compile * C; Phase( PhaseNumber pnum ); #ifndef PRODUCT static void print_timers(); #endif }; #endif // SHARE_VM_OPTO_PHASE_HPP