1 /* 2 * Copyright (c) 2016, 2020, Oracle and/or its affiliates. All rights reserved. 3 * Copyright (c) 2016, 2018 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_GLOBALS_S390_HPP 27 #define CPU_S390_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 define_pd_global(bool, ImplicitNullChecks, true); // Generate code for implicit null checks. 37 define_pd_global(bool, TrapBasedNullChecks, true); 38 define_pd_global(bool, UncommonNullCast, true); // Uncommon-trap NULLs passed to check cast. 39 40 define_pd_global(uintx, CodeCacheSegmentSize, 256); 41 // This shall be at least 32 for proper branch target alignment. 42 // Ideally, this is 256 (cache line size). This keeps code end data 43 // on separate lines. But we reduced it to 64 since 256 increased 44 // code size significantly by padding nops between IVC and second UEP. 45 define_pd_global(intx, CodeEntryAlignment, 64); 46 define_pd_global(intx, OptoLoopAlignment, 2); 47 define_pd_global(intx, InlineFrequencyCount, 100); 48 define_pd_global(intx, InlineSmallCode, 2000); 49 50 #define DEFAULT_STACK_YELLOW_PAGES (2) 51 #define DEFAULT_STACK_RED_PAGES (1) 52 // Java_java_net_SocketOutputStream_socketWrite0() uses a 64k buffer on the 53 // stack. To pass stack overflow tests we need 20 shadow pages. 54 #define DEFAULT_STACK_SHADOW_PAGES (20 DEBUG_ONLY(+4)) 55 #define DEFAULT_STACK_RESERVED_PAGES (1) 56 57 #define MIN_STACK_YELLOW_PAGES DEFAULT_STACK_YELLOW_PAGES 58 #define MIN_STACK_RED_PAGES DEFAULT_STACK_RED_PAGES 59 #define MIN_STACK_SHADOW_PAGES DEFAULT_STACK_SHADOW_PAGES 60 #define MIN_STACK_RESERVED_PAGES (0) 61 62 define_pd_global(intx, StackYellowPages, DEFAULT_STACK_YELLOW_PAGES); 63 define_pd_global(intx, StackRedPages, DEFAULT_STACK_RED_PAGES); 64 define_pd_global(intx, StackShadowPages, DEFAULT_STACK_SHADOW_PAGES); 65 define_pd_global(intx, StackReservedPages, DEFAULT_STACK_RESERVED_PAGES); 66 67 define_pd_global(bool, RewriteBytecodes, true); 68 define_pd_global(bool, RewriteFrequentPairs, true); 69 70 define_pd_global(bool, PreserveFramePointer, false); 71 72 define_pd_global(uintx, TypeProfileLevel, 111); 73 74 define_pd_global(bool, CompactStrings, true); 75 76 // 8146801 (Short Array Allocation): No performance work done here yet. 77 define_pd_global(intx, InitArrayShortSize, 1*BytesPerLong); 78 79 #include "runtime/flags/jvmFlag.hpp" 80 81 // Reoptimize code-sequences of calls at runtime, e.g. replace an 82 // indirect call by a direct call. 83 PRODUCT_FLAG(bool, ReoptimizeCallSequences, true, JVMFlag::DEFAULT, 84 "Reoptimize code-sequences of calls at runtime."); 85 86 PRODUCT_FLAG(bool, UseByteReverseInstruction, true, JVMFlag::DEFAULT, 87 "Use byte reverse instruction."); 88 89 PRODUCT_FLAG(bool, ExpandLoadingBaseDecode, true, JVMFlag::DEFAULT, 90 "Expand the assembler " 91 "instruction required to load the base from DecodeN nodes during " 92 "matching."); 93 94 PRODUCT_FLAG(bool, ExpandLoadingBaseDecode_NN, true, JVMFlag::DEFAULT, 95 "Expand the assembler " 96 "instruction required to load the base from DecodeN_NN nodes " 97 "during matching."); 98 99 PRODUCT_FLAG(bool, ExpandLoadingBaseEncode, true, JVMFlag::DEFAULT, 100 "Expand the assembler " 101 "instruction required to load the base from EncodeP nodes during " 102 "matching."); 103 104 PRODUCT_FLAG(bool, ExpandLoadingBaseEncode_NN, true, JVMFlag::DEFAULT, 105 "Expand the assembler " 106 "instruction required to load the base from EncodeP_NN nodes " 107 "during matching."); 108 109 110 // Seems to pay off with 2 pages already. 111 PRODUCT_FLAG(size_t, MVCLEThreshold, +2*(4*K), JVMFlag::DEFAULT, 112 "Threshold above which page-aligned MVCLE copy/init is used."); 113 114 PRODUCT_FLAG(bool, PreferLAoverADD, false, JVMFlag::DEFAULT, 115 "Use LA/LAY instructions over ADD instructions (z/Architecture)."); 116 117 DEVELOP_FLAG(bool, ZapEmptyStackFields, false, JVMFlag::DEFAULT, 118 "Write 0x0101... to empty stack" 119 " fields. Use this to ease stack debugging."); 120 121 PRODUCT_FLAG(bool, TraceTraps, false, JVMFlag::DEFAULT, 122 "Trace all traps the signal handler" 123 "handles."); 124 125 #endif // CPU_S390_GLOBALS_S390_HPP