1 /*
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   3  * Copyright (c) 2015, 2019, 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_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, ImplicitNullChecks,       true);  // Generate code for implicit null checks
  36 define_pd_global(bool, TrapBasedNullChecks,  false);
  37 define_pd_global(bool, UncommonNullCast,         true);  // Uncommon-trap NULLs past to check cast
  38 
  39 define_pd_global(uintx, CodeCacheSegmentSize,    64 TIERED_ONLY(+64)); // Tiered compilation has large code-entry alignment.
  40 define_pd_global(intx, CodeEntryAlignment,       64);
  41 define_pd_global(intx, OptoLoopAlignment,        16);
  42 define_pd_global(intx, InlineFrequencyCount,     100);
  43 
  44 #define DEFAULT_STACK_YELLOW_PAGES (2)
  45 #define DEFAULT_STACK_RED_PAGES (1)
  46 // Java_java_net_SocketOutputStream_socketWrite0() uses a 64k buffer on the
  47 // stack if compiled for unix and LP64. To pass stack overflow tests we need
  48 // 20 shadow pages.
  49 #define DEFAULT_STACK_SHADOW_PAGES (20 DEBUG_ONLY(+5))
  50 #define DEFAULT_STACK_RESERVED_PAGES (1)
  51 
  52 #define MIN_STACK_YELLOW_PAGES DEFAULT_STACK_YELLOW_PAGES
  53 #define MIN_STACK_RED_PAGES    DEFAULT_STACK_RED_PAGES
  54 #define MIN_STACK_SHADOW_PAGES DEFAULT_STACK_SHADOW_PAGES
  55 #define MIN_STACK_RESERVED_PAGES (0)
  56 
  57 define_pd_global(intx, StackYellowPages, DEFAULT_STACK_YELLOW_PAGES);
  58 define_pd_global(intx, StackRedPages, DEFAULT_STACK_RED_PAGES);
  59 define_pd_global(intx, StackShadowPages, DEFAULT_STACK_SHADOW_PAGES);
  60 define_pd_global(intx, StackReservedPages, DEFAULT_STACK_RESERVED_PAGES);
  61 
  62 define_pd_global(bool, RewriteBytecodes,     true);
  63 define_pd_global(bool, RewriteFrequentPairs, true);
  64 
  65 define_pd_global(bool, PreserveFramePointer, false);
  66 
  67 define_pd_global(uintx, TypeProfileLevel, 111);
  68 
  69 define_pd_global(bool, CompactStrings, true);
  70 
  71 // Clear short arrays bigger than one word in an arch-specific way
  72 define_pd_global(intx, InitArrayShortSize, BytesPerLong);
  73 
  74 #if defined(COMPILER1) || defined(COMPILER2)
  75 define_pd_global(intx, InlineSmallCode,          1000);
  76 #endif
  77 
  78 #define ARCH_FLAGS(develop, \
  79                    product, \
  80                    diagnostic, \
  81                    experimental, \
  82                    notproduct, \
  83                    range, \
  84                    constraint, \
  85                    writeable) \
  86                                                                         \
  87   product(bool, NearCpool, true,                                        \
  88          "constant pool is close to instructions")                      \
  89                                                                         \
  90   product(bool, UseBarriersForVolatile, false,                          \
  91           "Use memory barriers to implement volatile accesses")         \
  92   product(bool, UseNeon, false,                                         \
  93           "Use Neon for CRC32 computation")                             \
  94   product(bool, UseCRC32, false,                                        \
  95           "Use CRC32 instructions for CRC32 computation")               \
  96   product(bool, UseSIMDForMemoryOps, false,                             \
  97           "Use SIMD instructions in generated memory move code")        \
  98   product(bool, UseSIMDForArrayEquals, true,                            \
  99           "Use SIMD instructions in generated array equals code")       \
 100   product(bool, UseSimpleArrayEquals, false,                            \
 101           "Use simpliest and shortest implementation for array equals") \
 102   product(bool, AvoidUnalignedAccesses, false,                          \
 103           "Avoid generating unaligned memory accesses")                 \
 104   product(bool, UseLSE, false,                                          \
 105           "Use LSE instructions")                                       \
 106   product(bool, UseBlockZeroing, true,                                  \
 107           "Use DC ZVA for block zeroing")                               \
 108   product(intx, BlockZeroingLowLimit, 256,                              \
 109           "Minimum size in bytes when block zeroing will be used")      \
 110           range(1, max_jint)                                            \
 111   product(bool, TraceTraps, false, "Trace all traps the signal handler")\
 112   product(int, SoftwarePrefetchHintDistance, -1,                        \
 113           "Use prfm hint with specified distance in compiled code."     \
 114           "Value -1 means off.")                                        \
 115           range(-1, 4096)
 116 
 117 #endif // CPU_AARCH64_GLOBALS_AARCH64_HPP