src/hotspot/cpu/riscv/globals_riscv.hpp

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 * Copyright (c) 2000, 2023, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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.
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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#ifndef CPU_RISCV_GLOBALS_RISCV_HPP
#define CPU_RISCV_GLOBALS_RISCV_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)

define_pd_global(bool, ImplicitNullChecks,       true);  // Generate code for implicit null checks
define_pd_global(bool, TrapBasedNullChecks,      false);
define_pd_global(bool, UncommonNullCast,         true);  // Uncommon-trap nulls past to check cast

define_pd_global(bool, DelayCompilerStubsGeneration, COMPILER2_OR_JVMCI);

define_pd_global(uintx, CodeCacheSegmentSize,    64 COMPILER1_AND_COMPILER2_PRESENT(+64)); // Tiered compilation has large code-entry alignment.
define_pd_global(intx, CodeEntryAlignment,       64);
define_pd_global(intx, OptoLoopAlignment,        16);

#define DEFAULT_STACK_YELLOW_PAGES (2)
#define DEFAULT_STACK_RED_PAGES (1)
// Java_java_net_SocketOutputStream_socketWrite0() uses a 64k buffer on the
// stack if compiled for unix and LP64. To pass stack overflow tests we need
// 20 shadow pages.
#define DEFAULT_STACK_SHADOW_PAGES (20 DEBUG_ONLY(+5))
#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, VMContinuations, true);

define_pd_global(bool, RewriteBytecodes,     true);
define_pd_global(bool, RewriteFrequentPairs, true);

define_pd_global(bool, PreserveFramePointer, false);

define_pd_global(uintx, TypeProfileLevel, 111);

define_pd_global(bool, CompactStrings, true);

// Clear short arrays bigger than one word in an arch-specific way
define_pd_global(intx, InitArrayShortSize, BytesPerLong);

define_pd_global(intx, InlineSmallCode,          1000);

#define ARCH_FLAGS(develop,                                                      \
                   product,                                                      \
                   notproduct,                                                   \
                   range,                                                        \
                   constraint)                                                   \
                                                                                 \
  product(bool, NearCpool, true,                                                 \
         "constant pool is close to instructions")                               \
  product(bool, UseBlockZeroing, false,                                          \
          "Use Zicboz for block zeroing")                                        \
  product(intx, BlockZeroingLowLimit, 256,                                       \
          "Minimum size in bytes when block zeroing will be used")               \
          range(1, max_jint)                                                     \
  product(intx, CacheLineSize, DEFAULT_CACHE_LINE_SIZE,                          \
          "Size in bytes of a CPU cache line")                                   \
          range(wordSize, max_jint)                                              \
  product(bool, TraceTraps, false, "Trace all traps the signal handler")         \
  /* For now we're going to be safe and add the I/O bits to userspace fences. */ \
  product(bool, UseConservativeFence, true,                                      \
          "Extend i for r and o for w in the pred/succ flags of fence")          \
  product(bool, AvoidUnalignedAccesses, true,                                    \
          "Avoid generating unaligned memory accesses")                          \
  product(bool, UseRVA20U64, true, "Use RVA20U64 profile")                       \
  product(bool, UseRVC, false, "Use RVC instructions")                           \
  product(bool, UseRVA22U64, false, EXPERIMENTAL, "Use RVA22U64 profile")        \
  product(bool, UseRVV, false, EXPERIMENTAL, "Use RVV instructions")             \
  product(bool, UseZba, false, EXPERIMENTAL, "Use Zba instructions")             \
  product(bool, UseZbb, false, EXPERIMENTAL, "Use Zbb instructions")             \
  product(bool, UseZbs, false, EXPERIMENTAL, "Use Zbs instructions")             \
  product(bool, UseZic64b, false, EXPERIMENTAL, "Use Zic64b instructions")       \
  product(bool, UseZicbom, false, EXPERIMENTAL, "Use Zicbom instructions")       \
  product(bool, UseZicbop, false, EXPERIMENTAL, "Use Zicbop instructions")       \
  product(bool, UseZicboz, false, EXPERIMENTAL, "Use Zicboz instructions")       \
  product(bool, UseZihintpause, false, EXPERIMENTAL,                             \
          "Use Zihintpause instructions")                                        \
  product(bool, UseRVVForBigIntegerShiftIntrinsics, true,                        \
          "Use RVV instructions for left/right shift of BigInteger")

#endif // CPU_RISCV_GLOBALS_RISCV_HPP