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