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src/cpu/sparc/vm/globals_sparc.hpp@e1162778c1c8 (annotated)
src/cpu/sparc/vm/globals_sparc.hpp
Thu, 07 Apr 2011 09:53:20 -0700
- author
- johnc
- date
- Thu, 07 Apr 2011 09:53:20 -0700
- changeset 2781
- e1162778c1c8
- parent 2650
- dde920245681
- child 3552
- 28d91e43ab6d
- permissions
- -rw-r--r--
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
| duke@435 | 1 | /* |
| ysr@2650 | 2 | * Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved. |
| duke@435 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| duke@435 | 4 | * |
| duke@435 | 5 | * This code is free software; you can redistribute it and/or modify it |
| duke@435 | 6 | * under the terms of the GNU General Public License version 2 only, as |
| duke@435 | 7 | * published by the Free Software Foundation. |
| duke@435 | 8 | * |
| duke@435 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| duke@435 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| duke@435 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| duke@435 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
| duke@435 | 13 | * accompanied this code). |
| duke@435 | 14 | * |
| duke@435 | 15 | * You should have received a copy of the GNU General Public License version |
| duke@435 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
| duke@435 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| duke@435 | 18 | * |
| trims@1907 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| trims@1907 | 20 | * or visit www.oracle.com if you need additional information or have any |
| trims@1907 | 21 | * questions. |
| duke@435 | 22 | * |
| duke@435 | 23 | */ |
| duke@435 | 24 | |
| stefank@2314 | 25 | #ifndef CPU_SPARC_VM_GLOBALS_SPARC_HPP |
| stefank@2314 | 26 | #define CPU_SPARC_VM_GLOBALS_SPARC_HPP |
| stefank@2314 | 27 | |
| stefank@2314 | 28 | #include "utilities/globalDefinitions.hpp" |
| stefank@2314 | 29 | #include "utilities/macros.hpp" |
| stefank@2314 | 30 | |
| duke@435 | 31 | // Sets the default values for platform dependent flags used by the runtime system. |
| duke@435 | 32 | // (see globals.hpp) |
| duke@435 | 33 | |
| duke@435 | 34 | // For sparc we do not do call backs when a thread is in the interpreter, because the |
| duke@435 | 35 | // interpreter dispatch needs at least two instructions - first to load the dispatch address |
| duke@435 | 36 | // in a register, and second to jmp. The swapping of the dispatch table may occur _after_ |
| duke@435 | 37 | // the load of the dispatch address and hence the jmp would still go to the location |
| duke@435 | 38 | // according to the prior table. So, we let the thread continue and let it block by itself. |
| duke@435 | 39 | define_pd_global(bool, DontYieldALot, true); // yield no more than 100 times per second |
| duke@435 | 40 | define_pd_global(bool, ConvertSleepToYield, false); // do not convert sleep(0) to yield. Helps GUI |
| duke@435 | 41 | define_pd_global(bool, ShareVtableStubs, false); // improves performance markedly for mtrt and compress |
| duke@435 | 42 | define_pd_global(bool, CountInterpCalls, false); // not implemented in the interpreter |
| duke@435 | 43 | define_pd_global(bool, NeedsDeoptSuspend, true); // register window machines need this |
| duke@435 | 44 | |
| duke@435 | 45 | define_pd_global(bool, ImplicitNullChecks, true); // Generate code for implicit null checks |
| duke@435 | 46 | define_pd_global(bool, UncommonNullCast, true); // Uncommon-trap NULLs past to check cast |
| duke@435 | 47 | |
| phh@1499 | 48 | define_pd_global(intx, CodeEntryAlignment, 32); |
| kvn@1800 | 49 | // The default setting 16/16 seems to work best. |
| kvn@1800 | 50 | // (For _228_jack 16/16 is 2% better than 4/4, 16/4, 32/32, 32/16, or 16/32.) |
| kvn@1800 | 51 | define_pd_global(intx, OptoLoopAlignment, 16); // = 4*wordSize |
| phh@1499 | 52 | define_pd_global(intx, InlineFrequencyCount, 50); // we can use more inlining on the SPARC |
| phh@1499 | 53 | define_pd_global(intx, InlineSmallCode, 1500); |
| ysr@2650 | 54 | |
| duke@435 | 55 | #ifdef _LP64 |
| duke@435 | 56 | // Stack slots are 2X larger in LP64 than in the 32 bit VM. |
| phh@1499 | 57 | define_pd_global(intx, ThreadStackSize, 1024); |
| phh@1499 | 58 | define_pd_global(intx, VMThreadStackSize, 1024); |
| duke@435 | 59 | #else |
| phh@1499 | 60 | define_pd_global(intx, ThreadStackSize, 512); |
| phh@1499 | 61 | define_pd_global(intx, VMThreadStackSize, 512); |
| duke@435 | 62 | #endif |
| duke@435 | 63 | |
| duke@435 | 64 | define_pd_global(intx, StackYellowPages, 2); |
| duke@435 | 65 | define_pd_global(intx, StackRedPages, 1); |
| duke@435 | 66 | define_pd_global(intx, StackShadowPages, 3 DEBUG_ONLY(+1)); |
| duke@435 | 67 | |
| phh@1499 | 68 | define_pd_global(intx, PreInflateSpin, 40); // Determined by running design center |
| duke@435 | 69 | |
| duke@435 | 70 | define_pd_global(bool, RewriteBytecodes, true); |
| duke@435 | 71 | define_pd_global(bool, RewriteFrequentPairs, true); |
| bobv@2223 | 72 | |
| bobv@2223 | 73 | define_pd_global(bool, UseMembar, false); |
| stefank@2314 | 74 | |
| ysr@2650 | 75 | // GC Ergo Flags |
| ysr@2650 | 76 | define_pd_global(intx, CMSYoungGenPerWorker, 16*M); // default max size of CMS young gen, per GC worker thread |
| stefank@2314 | 77 | #endif // CPU_SPARC_VM_GLOBALS_SPARC_HPP |
