1 /*
   2  * Copyright (c) 2000, 2019, 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_GLOBALS_AARCH64_HPP
  27 #define CPU_AARCH64_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 
  37 define_pd_global(bool, ImplicitNullChecks,       true);  // Generate code for implicit null checks
  38 define_pd_global(bool, TrapBasedNullChecks,  false);
  39 define_pd_global(bool, UncommonNullCast,         true);  // Uncommon-trap NULLs past to check cast
  40 
  41 define_pd_global(uintx, CodeCacheSegmentSize,    64 TIERED_ONLY(+64)); // Tiered compilation has large code-entry alignment.
  42 define_pd_global(intx, CodeEntryAlignment,       64);
  43 define_pd_global(intx, OptoLoopAlignment,        16);
  44 define_pd_global(intx, InlineFrequencyCount,     100);
  45 
  46 #define DEFAULT_STACK_YELLOW_PAGES (2)
  47 #define DEFAULT_STACK_RED_PAGES (1)
  48 // Java_java_net_SocketOutputStream_socketWrite0() uses a 64k buffer on the
  49 // stack if compiled for unix and LP64. To pass stack overflow tests we need
  50 // 20 shadow pages.
  51 #define DEFAULT_STACK_SHADOW_PAGES (20 DEBUG_ONLY(+5))
  52 #define DEFAULT_STACK_RESERVED_PAGES (1)
  53 
  54 #define MIN_STACK_YELLOW_PAGES DEFAULT_STACK_YELLOW_PAGES
  55 #define MIN_STACK_RED_PAGES    DEFAULT_STACK_RED_PAGES
  56 #define MIN_STACK_SHADOW_PAGES DEFAULT_STACK_SHADOW_PAGES
  57 #define MIN_STACK_RESERVED_PAGES (0)
  58 
  59 define_pd_global(intx, StackYellowPages, DEFAULT_STACK_YELLOW_PAGES);
  60 define_pd_global(intx, StackRedPages, DEFAULT_STACK_RED_PAGES);
  61 define_pd_global(intx, StackShadowPages, DEFAULT_STACK_SHADOW_PAGES);
  62 define_pd_global(intx, StackReservedPages, DEFAULT_STACK_RESERVED_PAGES);
  63 
  64 define_pd_global(bool, RewriteBytecodes,     true);
  65 define_pd_global(bool, RewriteFrequentPairs, true);
  66 
  67 define_pd_global(bool, PreserveFramePointer, false);
  68 
  69 // GC Ergo Flags
  70 define_pd_global(uintx, CMSYoungGenPerWorker, 64*M);  // default max size of CMS young gen, per GC worker thread
  71 
  72 define_pd_global(uintx, TypeProfileLevel, 111);
  73 
  74 define_pd_global(bool, CompactStrings, true);
  75 
  76 // Clear short arrays bigger than one word in an arch-specific way
  77 define_pd_global(intx, InitArrayShortSize, BytesPerLong);
  78 
  79 define_pd_global(bool, ThreadLocalHandshakes, true);
  80 
  81 #if defined(COMPILER1) || defined(COMPILER2)
  82 define_pd_global(intx, InlineSmallCode,          1000);
  83 #endif
  84 
  85 #ifdef BUILTIN_SIM
  86 #define UseBuiltinSim           true
  87 #define ARCH_FLAGS(develop, \
  88                    product, \
  89                    diagnostic, \
  90                    experimental, \
  91                    notproduct, \
  92                    range, \
  93                    constraint, \
  94                    writeable) \
  95                                                                         \
  96   product(bool, NotifySimulator, UseBuiltinSim,                         \
  97          "tell the AArch64 sim where we are in method code")            \
  98                                                                         \
  99   product(bool, UseSimulatorCache, false,                               \
 100          "tell sim to cache memory updates until exclusive op occurs")  \
 101                                                                         \
 102   product(bool, DisableBCCheck, true,                                   \
 103           "tell sim not to invoke bccheck callback")                    \
 104                                                                         \
 105   product(bool, NearCpool, true,                                        \
 106          "constant pool is close to instructions")                      \
 107                                                                         \
 108   product(bool, UseBarriersForVolatile, false,                          \
 109           "Use memory barriers to implement volatile accesses")         \
 110                                                                         \
 111   product(bool, UseCRC32, false,                                        \
 112           "Use CRC32 instructions for CRC32 computation")               \
 113                                                                         \
 114   product(bool, UseLSE, false,                                          \
 115           "Use LSE instructions")                                       \
 116 
 117 // Don't attempt to use Neon on builtin sim until builtin sim supports it
 118 #define UseCRC32 false
 119 #define UseSIMDForMemoryOps    false
 120 #define AvoidUnalignedAcesses false
 121 
 122 #else
 123 #define UseBuiltinSim           false
 124 #define NotifySimulator         false
 125 #define UseSimulatorCache       false
 126 #define DisableBCCheck          true
 127 #define ARCH_FLAGS(develop, \
 128                    product, \
 129                    diagnostic, \
 130                    experimental, \
 131                    notproduct, \
 132                    range, \
 133                    constraint, \
 134                    writeable) \
 135                                                                         \
 136   product(bool, NearCpool, true,                                        \
 137          "constant pool is close to instructions")                      \
 138                                                                         \
 139   product(bool, UseBarriersForVolatile, false,                          \
 140           "Use memory barriers to implement volatile accesses")         \
 141   product(bool, UseNeon, false,                                         \
 142           "Use Neon for CRC32 computation")                             \
 143   product(bool, UseCRC32, false,                                        \
 144           "Use CRC32 instructions for CRC32 computation")               \
 145   product(bool, UseSIMDForMemoryOps, false,                             \
 146           "Use SIMD instructions in generated memory move code")        \
 147   product(bool, UseSIMDForArrayEquals, true,                            \
 148           "Use SIMD instructions in generated array equals code")       \
 149   product(bool, UseSimpleArrayEquals, false,                            \
 150           "Use simpliest and shortest implementation for array equals") \
 151   product(bool, AvoidUnalignedAccesses, false,                          \
 152           "Avoid generating unaligned memory accesses")                 \
 153   product(bool, UseLSE, false,                                          \
 154           "Use LSE instructions")                                       \
 155   product(bool, UseBlockZeroing, true,                                  \
 156           "Use DC ZVA for block zeroing")                               \
 157   product(intx, BlockZeroingLowLimit, 256,                              \
 158           "Minimum size in bytes when block zeroing will be used")      \
 159           range(1, max_jint)                                            \
 160   product(bool, TraceTraps, false, "Trace all traps the signal handler")\
 161   product(int, SoftwarePrefetchHintDistance, -1,                        \
 162           "Use prfm hint with specified distance in compiled code."     \
 163           "Value -1 means off.")                                        \
 164           range(-1, 4096)
 165 #endif
 166 
 167 
 168 #endif // CPU_AARCH64_GLOBALS_AARCH64_HPP