JDK14/Java14源码在线阅读
/*
* Copyright (c) 2002, 2019, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2012, 2018 SAP SE. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* 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.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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*/
#ifndef CPU_PPC_GLOBALS_PPC_HPP
#define CPU_PPC_GLOBALS_PPC_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, true);
define_pd_global(bool, UncommonNullCast, true); // Uncommon-trap NULLs passed to check cast.
#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(+2))
#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 (3 DEBUG_ONLY(+1))
#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);
// Use large code-entry alignment.
define_pd_global(uintx, CodeCacheSegmentSize, 128);
define_pd_global(intx, CodeEntryAlignment, 128);
define_pd_global(intx, OptoLoopAlignment, 16);
define_pd_global(intx, InlineFrequencyCount, 100);
define_pd_global(intx, InlineSmallCode, 1500);
// Flags for template interpreter.
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);
// 2x unrolled loop is shorter with more than 9 HeapWords.
define_pd_global(intx, InitArrayShortSize, 9*BytesPerLong);
// Platform dependent flag handling: flags only defined on this platform.
#define ARCH_FLAGS(develop, \
product, \
diagnostic, \
experimental, \
notproduct, \
range, \
constraint, \
writeable) \
\
product(uintx, PowerArchitecturePPC64, 0, \
"CPU Version: x for PowerX. Currently recognizes Power5 to " \
"Power8. Default is 0. Newer CPUs will be recognized as Power8.") \
\
product(bool, SuperwordUseVSX, false, \
"Use Power8 VSX instructions for superword optimization.") \
\
/* Reoptimize code-sequences of calls at runtime, e.g. replace an */ \
/* indirect call by a direct call. */ \
product(bool, ReoptimizeCallSequences, true, \
"Reoptimize code-sequences of calls at runtime.") \
\
/* Power 8: Configure Data Stream Control Register. */ \
product(uint64_t,DSCR_PPC64, (uintx)-1, \
"Power8 or later: Specify encoded value for Data Stream Control " \
"Register") \
product(uint64_t,DSCR_DPFD_PPC64, 8, \
"Power8 or later: DPFD (default prefetch depth) value of the " \
"Data Stream Control Register." \
" 0: hardware default, 1: none, 2-7: min-max, 8: don't touch") \
product(uint64_t,DSCR_URG_PPC64, 8, \
"Power8 or later: URG (depth attainment urgency) value of the " \
"Data Stream Control Register." \
" 0: hardware default, 1: none, 2-7: min-max, 8: don't touch") \
\
product(bool, UseLoadInstructionsForStackBangingPPC64, false, \
"Use load instructions for stack banging.") \
\
/* special instructions */ \
\
product(bool, UseCountLeadingZerosInstructionsPPC64, true, \
"Use count leading zeros instructions.") \
\
product(bool, UseCountTrailingZerosInstructionsPPC64, false, \
"Use count trailing zeros instructions.") \
\
product(bool, UseExtendedLoadAndReserveInstructionsPPC64, false, \
"Use extended versions of load-and-reserve instructions.") \
\
product(bool, UseRotateAndMaskInstructionsPPC64, true, \
"Use rotate and mask instructions.") \
\
product(bool, UseStaticBranchPredictionInCompareAndSwapPPC64, true, \
"Use static branch prediction hints in CAS operations.") \
product(bool, UseStaticBranchPredictionForUncommonPathsPPC64, false, \
"Use static branch prediction hints for uncommon paths.") \
\
product(bool, UsePower6SchedulerPPC64, false, \
"Use Power6 Scheduler.") \
\
product(bool, InsertEndGroupPPC64, false, \
"Insert EndGroup instructions to optimize for Power6.") \
\
/* Trap based checks. */ \
/* Trap based checks use the ppc trap instructions to check certain */ \
/* conditions. This instruction raises a SIGTRAP caught by the */ \
/* exception handler of the VM. */ \
product(bool, UseSIGTRAP, true, \
"Allow trap instructions that make use of SIGTRAP. Use this to " \
"switch off all optimizations requiring SIGTRAP.") \
product(bool, TrapBasedICMissChecks, true, \
"Raise and handle SIGTRAP if inline cache miss detected.") \
product(bool, TrapBasedNotEntrantChecks, true, \
"Raise and handle SIGTRAP if calling not entrant or zombie" \
" method.") \
product(bool, TraceTraps, false, "Trace all traps the signal handler" \
"handles.") \
\
product(bool, ZapMemory, false, "Write 0x0101... to empty memory." \
" Use this to ease debugging.") \
\
/* Use Restricted Transactional Memory for lock elision */ \
product(bool, UseRTMLocking, false, \
"Enable RTM lock eliding for inflated locks in compiled code") \
\
experimental(bool, UseRTMForStackLocks, false, \
"Enable RTM lock eliding for stack locks in compiled code") \
\
product(bool, UseRTMDeopt, false, \
"Perform deopt and recompilation based on RTM abort ratio") \
\
product(int, RTMRetryCount, 5, \
"Number of RTM retries on lock abort or busy") \
range(0, max_jint) \
\
experimental(int, RTMSpinLoopCount, 100, \
"Spin count for lock to become free before RTM retry") \
range(0, 32767) /* immediate operand limit on ppc */ \
\
experimental(int, RTMAbortThreshold, 1000, \
"Calculate abort ratio after this number of aborts") \
range(0, max_jint) \
\
experimental(int, RTMLockingThreshold, 10000, \
"Lock count at which to do RTM lock eliding without " \
"abort ratio calculation") \
range(0, max_jint) \
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