jdk8-mips64-public/hotspot: src/cpu/sparc/vm/globals

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

     1 /*

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     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

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    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

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    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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    25 #ifndef CPU_SPARC_VM_GLOBALS_SPARC_HPP

    26 #define CPU_SPARC_VM_GLOBALS_SPARC_HPP

    28 #include "utilities/globalDefinitions.hpp"

    29 #include "utilities/macros.hpp"

    31 // Sets the default values for platform dependent flags used by the runtime system.

    32 // (see globals.hpp)

    34 // For sparc we do not do call backs when a thread is in the interpreter, because the

    35 // interpreter dispatch needs at least two instructions - first to load the dispatch address

    36 // in a register, and second to jmp. The swapping of the dispatch table may occur _after_

    37 // the load of the dispatch address and hence the jmp would still go to the location

    38 // according to the prior table. So, we let the thread continue and let it block by itself.

    39 define_pd_global(bool, DontYieldALot,               true);  // yield no more than 100 times per second

    40 define_pd_global(bool, ConvertSleepToYield,         false); // do not convert sleep(0) to yield. Helps GUI

    41 define_pd_global(bool, ShareVtableStubs,            false); // improves performance markedly for mtrt and compress

    42 define_pd_global(bool, CountInterpCalls,            false); // not implemented in the interpreter

    43 define_pd_global(bool, NeedsDeoptSuspend,           true); // register window machines need this

    45 define_pd_global(bool, ImplicitNullChecks,          true);  // Generate code for implicit null checks

    46 define_pd_global(bool, UncommonNullCast,            true);  // Uncommon-trap NULLs past to check cast

    48 define_pd_global(intx, CodeEntryAlignment,    32);

    49 // The default setting 16/16 seems to work best.

    50 // (For _228_jack 16/16 is 2% better than 4/4, 16/4, 32/32, 32/16, or 16/32.)

    51 define_pd_global(intx, OptoLoopAlignment,     16);  // = 4*wordSize

    52 define_pd_global(intx, InlineFrequencyCount,  50);  // we can use more inlining on the SPARC

    53 define_pd_global(intx, InlineSmallCode,       1500);

    55 #ifdef _LP64

    56 // Stack slots are 2X larger in LP64 than in the 32 bit VM.

    57 define_pd_global(intx, ThreadStackSize,       1024);

    58 define_pd_global(intx, VMThreadStackSize,     1024);

    59 #else

    60 define_pd_global(intx, ThreadStackSize,       512);

    61 define_pd_global(intx, VMThreadStackSize,     512);

    62 #endif

    64 define_pd_global(intx, StackYellowPages, 2);

    65 define_pd_global(intx, StackRedPages, 1);

    66 define_pd_global(intx, StackShadowPages, 3 DEBUG_ONLY(+1));

    68 define_pd_global(intx, PreInflateSpin,       40);  // Determined by running design center

    70 define_pd_global(bool, RewriteBytecodes,     true);

    71 define_pd_global(bool, RewriteFrequentPairs, true);

    73 define_pd_global(bool, UseMembar,            false);

    75 // GC Ergo Flags

    76 define_pd_global(intx, CMSYoungGenPerWorker, 16*M);  // default max size of CMS young gen, per GC worker thread

    77 #endif // CPU_SPARC_VM_GLOBALS_SPARC_HPP

src/cpu/sparc/vm/globals_sparc.hpp@e1162778c1c8

src/cpu/sparc/vm/globals_sparc.hpp

Mercurial > jdk8-mips64-public > hotspot / file revision

src/cpu/sparc/vm/globals_sparc.hpp@e1162778c1c8

src/cpu/sparc/vm/globals_sparc.hpp