1 /* 2 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved. 3 * Copyright (c) 2016 SAP SE. All rights reserved. 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 5 * 6 * This code is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 only, as 8 * published by the Free Software Foundation. 9 * 10 * This code is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * version 2 for more details (a copy is included in the LICENSE file that 14 * accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License version 17 * 2 along with this work; if not, write to the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 * or visit www.oracle.com if you need additional information or have any 22 * questions. 23 * 24 */ 25 26 #ifndef CPU_S390_VM_GLOBALS_S390_HPP 27 #define CPU_S390_VM_GLOBALS_S390_HPP 28 29 #include "utilities/globalDefinitions.hpp" 30 #include "utilities/macros.hpp" 31 32 // Sets the default values for platform dependent flags used by the runtime system. 33 // (see globals.hpp) 34 // Sorted according to sparc. 35 36 // z/Architecture remembers branch targets, so don't share vtables. 37 define_pd_global(bool, ShareVtableStubs, false); 38 define_pd_global(bool, NeedsDeoptSuspend, false); // Only register window machines need this. 39 40 define_pd_global(bool, ImplicitNullChecks, true); // Generate code for implicit null checks. 41 define_pd_global(bool, TrapBasedNullChecks, true); 42 define_pd_global(bool, UncommonNullCast, true); // Uncommon-trap NULLs passed to check cast. 43 44 define_pd_global(uintx, CodeCacheSegmentSize, 256); 45 // This shall be at least 32 for proper branch target alignment. 46 // Ideally, this is 256 (cache line size). This keeps code end data 47 // on separate lines. But we reduced it to 64 since 256 increased 48 // code size significantly by padding nops between IVC and second UEP. 49 define_pd_global(intx, CodeEntryAlignment, 64); 50 define_pd_global(intx, OptoLoopAlignment, 2); 51 define_pd_global(intx, InlineFrequencyCount, 100); 52 define_pd_global(intx, InlineSmallCode, 2000); 53 54 #define DEFAULT_STACK_YELLOW_PAGES (2) 55 #define DEFAULT_STACK_RED_PAGES (1) 56 // Java_java_net_SocketOutputStream_socketWrite0() uses a 64k buffer on the 57 // stack. To pass stack overflow tests we need 20 shadow pages. 58 #define DEFAULT_STACK_SHADOW_PAGES (20 DEBUG_ONLY(+2)) 59 #define DEFAULT_STACK_RESERVED_PAGES (0) 60 61 #define MIN_STACK_YELLOW_PAGES DEFAULT_STACK_YELLOW_PAGES 62 #define MIN_STACK_RED_PAGES DEFAULT_STACK_RED_PAGES 63 #define MIN_STACK_SHADOW_PAGES DEFAULT_STACK_SHADOW_PAGES 64 #define MIN_STACK_RESERVED_PAGES (0) 65 66 define_pd_global(intx, StackYellowPages, DEFAULT_STACK_YELLOW_PAGES); 67 define_pd_global(intx, StackRedPages, DEFAULT_STACK_RED_PAGES); 68 define_pd_global(intx, StackShadowPages, DEFAULT_STACK_SHADOW_PAGES); 69 define_pd_global(intx, StackReservedPages, DEFAULT_STACK_RESERVED_PAGES); 70 71 define_pd_global(bool, RewriteBytecodes, true); 72 define_pd_global(bool, RewriteFrequentPairs, true); 73 74 define_pd_global(bool, UseMembar, false); 75 76 define_pd_global(bool, PreserveFramePointer, false); 77 78 // GC Ergo Flags 79 define_pd_global(size_t, CMSYoungGenPerWorker, 16*M); // Default max size of CMS young gen, per GC worker thread. 80 81 define_pd_global(uintx, TypeProfileLevel, 111); 82 83 define_pd_global(bool, CompactStrings, true); 84 85 // 8146801 (Short Array Allocation): No performance work done here yet. 86 define_pd_global(intx, InitArrayShortSize, 1*BytesPerLong); 87 88 #define ARCH_FLAGS(develop, product, diagnostic, experimental, notproduct, range, constraint, writeable) \ 89 \ 90 /* Reoptimize code-sequences of calls at runtime, e.g. replace an */ \ 91 /* indirect call by a direct call. */ \ 92 product(bool, ReoptimizeCallSequences, true, \ 93 "Reoptimize code-sequences of calls at runtime.") \ 94 \ 95 product(bool, UseCountLeadingZerosInstruction, true, \ 96 "Use count leading zeros instruction.") \ 97 \ 98 product(bool, UseByteReverseInstruction, true, \ 99 "Use byte reverse instruction.") \ 100 \ 101 product(bool, ExpandLoadingBaseDecode, true, "Expand the assembler " \ 102 "instruction required to load the base from DecodeN nodes during " \ 103 "matching.") \ 104 product(bool, ExpandLoadingBaseDecode_NN, true, "Expand the assembler " \ 105 "instruction required to load the base from DecodeN_NN nodes " \ 106 "during matching.") \ 107 product(bool, ExpandLoadingBaseEncode, true, "Expand the assembler " \ 108 "instruction required to load the base from EncodeP nodes during " \ 109 "matching.") \ 110 product(bool, ExpandLoadingBaseEncode_NN, true, "Expand the assembler " \ 111 "instruction required to load the base from EncodeP_NN nodes " \ 112 "during matching.") \ 113 \ 114 /* Seems to pay off with 2 pages already. */ \ 115 product(size_t, MVCLEThreshold, +2*(4*K), \ 116 "Threshold above which page-aligned MVCLE copy/init is used.") \ 117 \ 118 product(bool, PreferLAoverADD, false, \ 119 "Use LA/LAY instructions over ADD instructions (z/Architecture).") \ 120 \ 121 develop(bool, ZapEmptyStackFields, false, "Write 0x0101... to empty stack" \ 122 " fields. Use this to ease stack debugging.") \ 123 \ 124 product(bool, TraceTraps, false, "Trace all traps the signal handler" \ 125 "handles.") 126 127 #endif // CPU_S390_VM_GLOBALS_S390_HPP