1 /* 2 * Copyright (c) 2000, 2009, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 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). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 // Sets the default values for platform dependent flags used by the runtime system. 26 // (see globals.hpp) 27 28 // For sparc we do not do call backs when a thread is in the interpreter, because the 29 // interpreter dispatch needs at least two instructions - first to load the dispatch address 30 // in a register, and second to jmp. The swapping of the dispatch table may occur _after_ 31 // the load of the dispatch address and hence the jmp would still go to the location 32 // according to the prior table. So, we let the thread continue and let it block by itself. 33 define_pd_global(bool, DontYieldALot, true); // yield no more than 100 times per second 34 define_pd_global(bool, ConvertSleepToYield, false); // do not convert sleep(0) to yield. Helps GUI 35 define_pd_global(bool, ShareVtableStubs, false); // improves performance markedly for mtrt and compress 36 define_pd_global(bool, CountInterpCalls, false); // not implemented in the interpreter 37 define_pd_global(bool, NeedsDeoptSuspend, true); // register window machines need this 38 39 define_pd_global(bool, ImplicitNullChecks, true); // Generate code for implicit null checks 40 define_pd_global(bool, UncommonNullCast, true); // Uncommon-trap NULLs past to check cast 41 42 define_pd_global(intx, CodeEntryAlignment, 32); 43 // The default setting 16/16 seems to work best. 44 // (For _228_jack 16/16 is 2% better than 4/4, 16/4, 32/32, 32/16, or 16/32.) 45 define_pd_global(intx, OptoLoopAlignment, 16); // = 4*wordSize 46 define_pd_global(intx, InlineFrequencyCount, 50); // we can use more inlining on the SPARC 47 define_pd_global(intx, InlineSmallCode, 1500); 48 #ifdef _LP64 49 // Stack slots are 2X larger in LP64 than in the 32 bit VM. 50 define_pd_global(intx, ThreadStackSize, 1024); 51 define_pd_global(intx, VMThreadStackSize, 1024); 52 #else 53 define_pd_global(intx, ThreadStackSize, 512); 54 define_pd_global(intx, VMThreadStackSize, 512); 55 #endif 56 57 define_pd_global(intx, StackYellowPages, 2); 58 define_pd_global(intx, StackRedPages, 1); 59 define_pd_global(intx, StackShadowPages, 3 DEBUG_ONLY(+1)); 60 61 define_pd_global(intx, PreInflateSpin, 40); // Determined by running design center 62 63 define_pd_global(bool, RewriteBytecodes, true); 64 define_pd_global(bool, RewriteFrequentPairs, true); 65 66 define_pd_global(bool, UseMembar, false);