/*

 * Copyright (c) 2016, 2019, Oracle and/or its affiliates. All rights reserved.

 * Copyright (c) 2016, 2018 SAP SE. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

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 *

 */

#ifndef CPU_S390_GLOBALS_S390_HPP

#define CPU_S390_GLOBALS_S390_HPP

#include "utilities/globalDefinitions.hpp"

#include "utilities/macros.hpp"

// Sets the default values for platform dependent flags used by the runtime system.

// (see globals.hpp)

// Sorted according to sparc.

// z/Architecture remembers branch targets, so don't share vtables.

define_pd_global(bool,  ShareVtableStubs,            true);

define_pd_global(bool,  ImplicitNullChecks,          true);  // Generate code for implicit null checks.

define_pd_global(bool,  TrapBasedNullChecks,         true);

define_pd_global(bool,  UncommonNullCast,            true);  // Uncommon-trap NULLs passed to check cast.

define_pd_global(uintx, CodeCacheSegmentSize,        256);

// This shall be at least 32 for proper branch target alignment.

// Ideally, this is 256 (cache line size). This keeps code end data

// on separate lines. But we reduced it to 64 since 256 increased

// code size significantly by padding nops between IVC and second UEP.

define_pd_global(intx,  CodeEntryAlignment,          64);

define_pd_global(intx,  OptoLoopAlignment,           2);

define_pd_global(intx,  InlineFrequencyCount,        100);

define_pd_global(intx,  InlineSmallCode,             2000);

#define DEFAULT_STACK_YELLOW_PAGES   (2)

#define DEFAULT_STACK_RED_PAGES      (1)

// Java_java_net_SocketOutputStream_socketWrite0() uses a 64k buffer on the

// stack. To pass stack overflow tests we need 20 shadow pages.

#define DEFAULT_STACK_RESERVED_PAGES (1)

#define MIN_STACK_YELLOW_PAGES     DEFAULT_STACK_YELLOW_PAGES

#define MIN_STACK_RED_PAGES        DEFAULT_STACK_RED_PAGES

#define MIN_STACK_SHADOW_PAGES     DEFAULT_STACK_SHADOW_PAGES

#define MIN_STACK_RESERVED_PAGES   (0)

define_pd_global(intx,  StackYellowPages,            DEFAULT_STACK_YELLOW_PAGES);

define_pd_global(intx,  StackRedPages,               DEFAULT_STACK_RED_PAGES);

define_pd_global(intx,  StackShadowPages,            DEFAULT_STACK_SHADOW_PAGES);

define_pd_global(intx,  StackReservedPages,          DEFAULT_STACK_RESERVED_PAGES);

define_pd_global(bool, RewriteBytecodes,     true);

define_pd_global(bool, RewriteFrequentPairs, true);

define_pd_global(bool, PreserveFramePointer, false);

// GC Ergo Flags

define_pd_global(size_t, CMSYoungGenPerWorker, 16*M);  // Default max size of CMS young gen, per GC worker thread.

define_pd_global(uintx, TypeProfileLevel, 111);

define_pd_global(bool, CompactStrings, true);

// 8146801 (Short Array Allocation): No performance work done here yet.

define_pd_global(intx, InitArrayShortSize, 1*BytesPerLong);

define_pd_global(bool, ThreadLocalHandshakes, true);

#define ARCH_FLAGS(develop,      \

                   product,      \

                   diagnostic,   \

                   experimental, \

                   notproduct,   \

                   range,        \

                   constraint,   \

                   writeable)    \

                                                                              \

  /* Reoptimize code-sequences of calls at runtime, e.g. replace an */        \

  /* indirect call by a direct call.                                */        \

  product(bool, ReoptimizeCallSequences, true,                                \

          "Reoptimize code-sequences of calls at runtime.")                   \

                                                                              \

  product(bool, UseByteReverseInstruction, true,                              \

          "Use byte reverse instruction.")                                    \

                                                                              \

  product(bool, ExpandLoadingBaseDecode, true, "Expand the assembler "        \

          "instruction required to load the base from DecodeN nodes during "  \

          "matching.")                                                        \

  product(bool, ExpandLoadingBaseDecode_NN, true, "Expand the assembler "     \

          "instruction required to load the base from DecodeN_NN nodes "      \

          "during matching.")                                                 \

  product(bool, ExpandLoadingBaseEncode, true, "Expand the assembler "        \

          "instruction required to load the base from EncodeP nodes during "  \

          "matching.")                                                        \

  product(bool, ExpandLoadingBaseEncode_NN, true, "Expand the assembler "     \

          "instruction required to load the base from EncodeP_NN nodes "      \

          "during matching.")                                                 \

                                                                              \

  /* Seems to pay off with 2 pages already. */                                \

  product(size_t, MVCLEThreshold, +2*(4*K),                                   \

          "Threshold above which page-aligned MVCLE copy/init is used.")      \

                                                                              \

  product(bool, PreferLAoverADD, false,                                       \

          "Use LA/LAY instructions over ADD instructions (z/Architecture).")  \

                                                                              \

  develop(bool, ZapEmptyStackFields, false, "Write 0x0101... to empty stack"  \

          " fields. Use this to ease stack debugging.")                       \

                                                                              \

  product(bool, TraceTraps, false, "Trace all traps the signal handler"       \

          "handles.")

#endif // CPU_S390_GLOBALS_S390_HPP