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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  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(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 #define DEFAULT_STACK_SHADOW_PAGES (4 DEBUG_ONLY(+5))
  49 #define DEFAULT_STACK_RESERVED_PAGES (0)
  50 
  51 #define MIN_STACK_YELLOW_PAGES 1
  52 #define MIN_STACK_RED_PAGES    1
  53 #define MIN_STACK_SHADOW_PAGES 1
  54 #define MIN_STACK_RESERVED_PAGES (0)
  55 
  56 define_pd_global(intx, StackYellowPages, DEFAULT_STACK_YELLOW_PAGES);
  57 define_pd_global(intx, StackRedPages, DEFAULT_STACK_RED_PAGES);
  58 define_pd_global(intx, StackShadowPages, DEFAULT_STACK_SHADOW_PAGES);
  59 define_pd_global(intx, StackReservedPages, DEFAULT_STACK_RESERVED_PAGES);
  60 
  61 define_pd_global(bool, RewriteBytecodes,     true);
  62 define_pd_global(bool, RewriteFrequentPairs, true);
  63 
  64 define_pd_global(bool, UseMembar,            true);
  65 
  66 define_pd_global(bool, PreserveFramePointer, false);
  67 
  68 // GC Ergo Flags
  69 define_pd_global(uintx, CMSYoungGenPerWorker, 64*M);  // default max size of CMS young gen, per GC worker thread
  70 
  71 define_pd_global(uintx, TypeProfileLevel, 111);
  72 
  73 // No performance work done here yet.
  74 define_pd_global(bool, CompactStrings, false);
  75 
  76 // avoid biased locking while we are bootstrapping the aarch64 build
  77 define_pd_global(bool, UseBiasedLocking, false);
  78 
  79 define_pd_global(intx, InitArrayShortSize, 18*BytesPerLong);
  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, product, diagnostic, experimental, notproduct, range, constraint) \
  88                                                                         \
  89   product(bool, NotifySimulator, UseBuiltinSim,                         \
  90          "tell the AArch64 sim where we are in method code")            \
  91                                                                         \
  92   product(bool, UseSimulatorCache, false,                               \
  93          "tell sim to cache memory updates until exclusive op occurs")  \
  94                                                                         \
  95   product(bool, DisableBCCheck, true,                                   \
  96           "tell sim not to invoke bccheck callback")                    \
  97                                                                         \
  98   product(bool, NearCpool, true,                                        \
  99          "constant pool is close to instructions")                      \
 100                                                                         \
 101   product(bool, UseBarriersForVolatile, false,                          \
 102           "Use memory barriers to implement volatile accesses")         \
 103                                                                         \
 104   product(bool, UseCRC32, false,                                        \
 105           "Use CRC32 instructions for CRC32 computation")               \
 106 
 107 // Don't attempt to use Neon on builtin sim until builtin sim supports it
 108 #define UseCRC32 false
 109 
 110 #else
 111 #define UseBuiltinSim           false
 112 #define NotifySimulator         false
 113 #define UseSimulatorCache       false
 114 #define DisableBCCheck          true
 115 #define ARCH_FLAGS(develop, product, diagnostic, experimental, notproduct, range, constraint) \
 116                                                                         \
 117   product(bool, NearCpool, true,                                        \
 118          "constant pool is close to instructions")                      \
 119                                                                         \
 120   product(bool, UseBarriersForVolatile, false,                          \
 121           "Use memory barriers to implement volatile accesses")         \
 122   product(bool, UseNeon, false,                                         \
 123           "Use Neon for CRC32 computation")                             \
 124   product(bool, UseCRC32, false,                                        \
 125           "Use CRC32 instructions for CRC32 computation")               \
 126   product(bool, TraceTraps, false, "Trace all traps the signal handler")
 127 
 128 #endif
 129 
 130 
 131 #endif // CPU_AARCH64_VM_GLOBALS_AARCH64_HPP