globals_x86.hpp

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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#ifndef CPU_X86_VM_GLOBALS_X86_HPP
#define CPU_X86_VM_GLOBALS_X86_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, ConvertSleepToYield,      true);
define_pd_global(bool, ShareVtableStubs,         true);
define_pd_global(bool, CountInterpCalls,         true);
define_pd_global(bool, NeedsDeoptSuspend,        false); // only register window machines need this

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

// See 4827828 for this change. There is no globals_core_i486.hpp. I can't
// assign a different value for C2 without touching a number of files. Use
// #ifdef to minimize the change as it's late in Mantis. -- FIXME.
// c1 doesn't have this problem because the fix to 4858033 assures us
// the the vep is aligned at CodeEntryAlignment whereas c2 only aligns
// the uep and the vep doesn't get real alignment but just slops on by
// only assured that the entry instruction meets the 5 byte size requirement.
#ifdef COMPILER2
define_pd_global(intx, CodeEntryAlignment,       32);
#else
define_pd_global(intx, CodeEntryAlignment,       16);
#endif // COMPILER2
define_pd_global(intx, OptoLoopAlignment,        16);
define_pd_global(intx, InlineFrequencyCount,     100);
define_pd_global(intx, InlineSmallCode,          1000);

define_pd_global(intx, StackYellowPages, 2);
define_pd_global(intx, StackRedPages, 1);
#ifdef AMD64
// Very large C++ stack frames using solaris-amd64 optimized builds
// due to lack of optimization caused by C++ compiler bugs
define_pd_global(intx, StackShadowPages, SOLARIS_ONLY(20) NOT_SOLARIS(6) DEBUG_ONLY(+2));
#else
define_pd_global(intx, StackShadowPages, 3 DEBUG_ONLY(+5));
#endif // AMD64

define_pd_global(intx, PreInflateSpin,           10);

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

#ifdef _ALLBSD_SOURCE
define_pd_global(bool, UseMembar,            true);
#else
define_pd_global(bool, UseMembar,            false);
#endif

// GC Ergo Flags
define_pd_global(intx, CMSYoungGenPerWorker, 64*M);  // default max size of CMS young gen, per GC worker thread
#endif // CPU_X86_VM_GLOBALS_X86_HPP