1 /*
   2  * Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
   3  * Copyright (c) 2015, Red Hat Inc. 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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  24  */
  25 
  26 #ifndef CPU_AARCH64_VM_GLOBALS_AARCH64_HPP
  27 #define CPU_AARCH64_VM_GLOBALS_AARCH64_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 
  35 define_pd_global(bool, ShareVtableStubs,         true);
  36 define_pd_global(bool, NeedsDeoptSuspend,        false); // only register window machines need this
  37 
  38 define_pd_global(bool, ImplicitNullChecks,       true);  // Generate code for implicit null checks
  39 define_pd_global(bool, TrapBasedNullChecks,  false);
  40 define_pd_global(bool, UncommonNullCast,         true);  // Uncommon-trap NULLs past to check cast
  41 
  42 define_pd_global(uintx, CodeCacheSegmentSize,    64 TIERED_ONLY(+64)); // Tiered compilation has large code-entry alignment.
  43 define_pd_global(intx, CodeEntryAlignment,       64);
  44 define_pd_global(intx, OptoLoopAlignment,        16);
  45 define_pd_global(intx, InlineFrequencyCount,     100);
  46 
  47 #define DEFAULT_STACK_YELLOW_PAGES (2)
  48 #define DEFAULT_STACK_RED_PAGES (1)
  49 // Java_java_net_SocketOutputStream_socketWrite0() uses a 64k buffer on the
  50 // stack if compiled for unix and LP64. To pass stack overflow tests we need
  51 // 20 shadow pages.
  52 #define DEFAULT_STACK_SHADOW_PAGES (20 DEBUG_ONLY(+5))
  53 #define DEFAULT_STACK_RESERVED_PAGES (1)
  54 
  55 #define MIN_STACK_YELLOW_PAGES DEFAULT_STACK_YELLOW_PAGES
  56 #define MIN_STACK_RED_PAGES    DEFAULT_STACK_RED_PAGES
  57 #define MIN_STACK_SHADOW_PAGES DEFAULT_STACK_SHADOW_PAGES
  58 #define MIN_STACK_RESERVED_PAGES (0)
  59 
  60 define_pd_global(intx, StackYellowPages, DEFAULT_STACK_YELLOW_PAGES);
  61 define_pd_global(intx, StackRedPages, DEFAULT_STACK_RED_PAGES);
  62 define_pd_global(intx, StackShadowPages, DEFAULT_STACK_SHADOW_PAGES);
  63 define_pd_global(intx, StackReservedPages, DEFAULT_STACK_RESERVED_PAGES);
  64 
  65 define_pd_global(bool, RewriteBytecodes,     true);
  66 define_pd_global(bool, RewriteFrequentPairs, true);
  67 
  68 define_pd_global(bool, UseMembar,            true);
  69 
  70 define_pd_global(bool, PreserveFramePointer, false);
  71 
  72 // GC Ergo Flags
  73 define_pd_global(uintx, CMSYoungGenPerWorker, 64*M);  // default max size of CMS young gen, per GC worker thread
  74 
  75 define_pd_global(uintx, TypeProfileLevel, 111);
  76 
  77 define_pd_global(bool, CompactStrings, true);
  78 
  79 // Clear short arrays bigger than one word in an arch-specific way
  80 define_pd_global(intx, InitArrayShortSize, BytesPerLong);
  81 
  82 #if defined(COMPILER1) || defined(COMPILER2)
  83 define_pd_global(intx, InlineSmallCode,          1000);
  84 #endif
  85 
  86 #ifdef BUILTIN_SIM
  87 #define UseBuiltinSim           true
  88 #define ARCH_FLAGS(develop, \
  89                    product, \
  90                    diagnostic, \
  91                    experimental, \
  92                    notproduct, \
  93                    range, \
  94                    constraint, \
  95                    writeable) \
  96                                                                         \
  97   product(bool, NotifySimulator, UseBuiltinSim,                         \
  98          "tell the AArch64 sim where we are in method code")            \
  99                                                                         \
 100   product(bool, UseSimulatorCache, false,                               \
 101          "tell sim to cache memory updates until exclusive op occurs")  \
 102                                                                         \
 103   product(bool, DisableBCCheck, true,                                   \
 104           "tell sim not to invoke bccheck callback")                    \
 105                                                                         \
 106   product(bool, NearCpool, true,                                        \
 107          "constant pool is close to instructions")                      \
 108                                                                         \
 109   product(bool, UseBarriersForVolatile, false,                          \
 110           "Use memory barriers to implement volatile accesses")         \
 111                                                                         \
 112   product(bool, UseCRC32, false,                                        \
 113           "Use CRC32 instructions for CRC32 computation")               \
 114                                                                         \
 115   product(bool, UseLSE, false,                                          \
 116           "Use LSE instructions")                                       \
 117 
 118 // Don't attempt to use Neon on builtin sim until builtin sim supports it
 119 #define UseCRC32 false
 120 #define UseSIMDForMemoryOps    false
 121 #define AvoidUnalignedAcesses false
 122 
 123 #else
 124 #define UseBuiltinSim           false
 125 #define NotifySimulator         false
 126 #define UseSimulatorCache       false
 127 #define DisableBCCheck          true
 128 #define ARCH_FLAGS(develop, \
 129                    product, \
 130                    diagnostic, \
 131                    experimental, \
 132                    notproduct, \
 133                    range, \
 134                    constraint, \
 135                    writeable) \
 136                                                                         \
 137   product(bool, NearCpool, true,                                        \
 138          "constant pool is close to instructions")                      \
 139                                                                         \
 140   product(bool, UseBarriersForVolatile, false,                          \
 141           "Use memory barriers to implement volatile accesses")         \
 142   product(bool, UseNeon, false,                                         \
 143           "Use Neon for CRC32 computation")                             \
 144   product(bool, UseCRC32, false,                                        \
 145           "Use CRC32 instructions for CRC32 computation")               \
 146   product(bool, UseSIMDForMemoryOps, false,                             \
 147           "Use SIMD instructions in generated memory move code")        \
 148   product(bool, AvoidUnalignedAccesses, false,                          \
 149           "Avoid generating unaligned memory accesses")                 \
 150   product(bool, UseLSE, false,                                          \
 151           "Use LSE instructions")                                       \
 152   product(bool, UseBlockZeroing, true,                                  \
 153           "Use DC ZVA for block zeroing")                               \
 154   product(intx, BlockZeroingLowLimit, 256,                              \
 155           "Minimum size in bytes when block zeroing will be used")      \
 156           range(1, max_jint)                                            \
 157   product(bool, TraceTraps, false, "Trace all traps the signal handler")
 158 
 159 #endif
 160 
 161 
 162 #endif // CPU_AARCH64_VM_GLOBALS_AARCH64_HPP