1 /*
   2  * Copyright (c) 2016, 2019, 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
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  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 // z/Architecture remembers branch targets, so don't share vtables.
  37 define_pd_global(bool,  ShareVtableStubs,            true);
  38 
  39 define_pd_global(bool,  ImplicitNullChecks,          true);  // Generate code for implicit null checks.
  40 define_pd_global(bool,  TrapBasedNullChecks,         true);
  41 define_pd_global(bool,  UncommonNullCast,            true);  // Uncommon-trap NULLs passed to check cast.
  42 
  43 define_pd_global(bool, UseFastClassInitChecks, false); // not implemented
  44 
  45 define_pd_global(uintx, CodeCacheSegmentSize,        256);
  46 // This shall be at least 32 for proper branch target alignment.
  47 // Ideally, this is 256 (cache line size). This keeps code end data
  48 // on separate lines. But we reduced it to 64 since 256 increased
  49 // code size significantly by padding nops between IVC and second UEP.
  50 define_pd_global(intx,  CodeEntryAlignment,          64);
  51 define_pd_global(intx,  OptoLoopAlignment,           2);
  52 define_pd_global(intx,  InlineFrequencyCount,        100);
  53 define_pd_global(intx,  InlineSmallCode,             2000);
  54 
  55 #define DEFAULT_STACK_YELLOW_PAGES   (2)
  56 #define DEFAULT_STACK_RED_PAGES      (1)
  57 // Java_java_net_SocketOutputStream_socketWrite0() uses a 64k buffer on the
  58 // stack. To pass stack overflow tests we need 20 shadow pages.
  59 #define DEFAULT_STACK_SHADOW_PAGES   (20 DEBUG_ONLY(+2))
  60 #define DEFAULT_STACK_RESERVED_PAGES (1)
  61 
  62 #define MIN_STACK_YELLOW_PAGES     DEFAULT_STACK_YELLOW_PAGES
  63 #define MIN_STACK_RED_PAGES        DEFAULT_STACK_RED_PAGES
  64 #define MIN_STACK_SHADOW_PAGES     DEFAULT_STACK_SHADOW_PAGES
  65 #define MIN_STACK_RESERVED_PAGES   (0)
  66 
  67 define_pd_global(intx,  StackYellowPages,            DEFAULT_STACK_YELLOW_PAGES);
  68 define_pd_global(intx,  StackRedPages,               DEFAULT_STACK_RED_PAGES);
  69 define_pd_global(intx,  StackShadowPages,            DEFAULT_STACK_SHADOW_PAGES);
  70 define_pd_global(intx,  StackReservedPages,          DEFAULT_STACK_RESERVED_PAGES);
  71 
  72 define_pd_global(bool, RewriteBytecodes,     true);
  73 define_pd_global(bool, RewriteFrequentPairs, true);
  74 
  75 define_pd_global(bool, PreserveFramePointer, false);
  76 
  77 // GC Ergo Flags
  78 define_pd_global(size_t, CMSYoungGenPerWorker, 16*M);  // Default max size of CMS young gen, per GC worker thread.
  79 
  80 define_pd_global(uintx, TypeProfileLevel, 111);
  81 
  82 define_pd_global(bool, CompactStrings, true);
  83 
  84 // 8146801 (Short Array Allocation): No performance work done here yet.
  85 define_pd_global(intx, InitArrayShortSize, 1*BytesPerLong);
  86 
  87 define_pd_global(bool, ThreadLocalHandshakes, true);
  88 
  89 #define ARCH_FLAGS(develop,      \
  90                    product,      \
  91                    diagnostic,   \
  92                    experimental, \
  93                    notproduct,   \
  94                    range,        \
  95                    constraint,   \
  96                    writeable)    \
  97                                                                               \
  98   /* Reoptimize code-sequences of calls at runtime, e.g. replace an */        \
  99   /* indirect call by a direct call.                                */        \
 100   product(bool, ReoptimizeCallSequences, true,                                \
 101           "Reoptimize code-sequences of calls at runtime.")                   \
 102                                                                               \
 103   product(bool, UseByteReverseInstruction, true,                              \
 104           "Use byte reverse instruction.")                                    \
 105                                                                               \
 106   product(bool, ExpandLoadingBaseDecode, true, "Expand the assembler "        \
 107           "instruction required to load the base from DecodeN nodes during "  \
 108           "matching.")                                                        \
 109   product(bool, ExpandLoadingBaseDecode_NN, true, "Expand the assembler "     \
 110           "instruction required to load the base from DecodeN_NN nodes "      \
 111           "during matching.")                                                 \
 112   product(bool, ExpandLoadingBaseEncode, true, "Expand the assembler "        \
 113           "instruction required to load the base from EncodeP nodes during "  \
 114           "matching.")                                                        \
 115   product(bool, ExpandLoadingBaseEncode_NN, true, "Expand the assembler "     \
 116           "instruction required to load the base from EncodeP_NN nodes "      \
 117           "during matching.")                                                 \
 118                                                                               \
 119   /* Seems to pay off with 2 pages already. */                                \
 120   product(size_t, MVCLEThreshold, +2*(4*K),                                   \
 121           "Threshold above which page-aligned MVCLE copy/init is used.")      \
 122                                                                               \
 123   product(bool, PreferLAoverADD, false,                                       \
 124           "Use LA/LAY instructions over ADD instructions (z/Architecture).")  \
 125                                                                               \
 126   develop(bool, ZapEmptyStackFields, false, "Write 0x0101... to empty stack"  \
 127           " fields. Use this to ease stack debugging.")                       \
 128                                                                               \
 129   product(bool, TraceTraps, false, "Trace all traps the signal handler"       \
 130           "handles.")
 131 
 132 #endif // CPU_S390_GLOBALS_S390_HPP