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src/hotspot/cpu/x86/globals_x86.hpp

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  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef CPU_X86_GLOBALS_X86_HPP
  26 #define CPU_X86_GLOBALS_X86_HPP
  27 
  28 #include "utilities/globalDefinitions.hpp"
  29 #include "utilities/macros.hpp"
  30 
  31 // Sets the default values for platform dependent flags used by the runtime system.
  32 // (see globals.hpp)
  33 
  34 define_pd_global(bool, ShareVtableStubs,         true);
  35 
  36 define_pd_global(bool, ImplicitNullChecks,       true);  // Generate code for implicit null checks
  37 define_pd_global(bool, TrapBasedNullChecks,      false); // Not needed on x86.
  38 define_pd_global(bool, UncommonNullCast,         true);  // Uncommon-trap NULLs passed to check cast
  39 


  40 define_pd_global(uintx, CodeCacheSegmentSize,    64 TIERED_ONLY(+64)); // Tiered compilation has large code-entry alignment.
  41 // See 4827828 for this change. There is no globals_core_i486.hpp. I can't
  42 // assign a different value for C2 without touching a number of files. Use
  43 // #ifdef to minimize the change as it's late in Mantis. -- FIXME.
  44 // c1 doesn't have this problem because the fix to 4858033 assures us
  45 // the the vep is aligned at CodeEntryAlignment whereas c2 only aligns
  46 // the uep and the vep doesn't get real alignment but just slops on by
  47 // only assured that the entry instruction meets the 5 byte size requirement.
  48 #if COMPILER2_OR_JVMCI
  49 define_pd_global(intx, CodeEntryAlignment,       32);
  50 #else
  51 define_pd_global(intx, CodeEntryAlignment,       16);
  52 #endif // COMPILER2_OR_JVMCI
  53 define_pd_global(intx, OptoLoopAlignment,        16);
  54 define_pd_global(intx, InlineFrequencyCount,     100);
  55 define_pd_global(intx, InlineSmallCode,          1000);
  56 
  57 #define DEFAULT_STACK_YELLOW_PAGES (NOT_WINDOWS(2) WINDOWS_ONLY(3))
  58 #define DEFAULT_STACK_RED_PAGES (1)
  59 #define DEFAULT_STACK_RESERVED_PAGES (NOT_WINDOWS(1) WINDOWS_ONLY(0))




  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef CPU_X86_GLOBALS_X86_HPP
  26 #define CPU_X86_GLOBALS_X86_HPP
  27 
  28 #include "utilities/globalDefinitions.hpp"
  29 #include "utilities/macros.hpp"
  30 
  31 // Sets the default values for platform dependent flags used by the runtime system.
  32 // (see globals.hpp)
  33 
  34 define_pd_global(bool, ShareVtableStubs,         true);
  35 
  36 define_pd_global(bool, ImplicitNullChecks,       true);  // Generate code for implicit null checks
  37 define_pd_global(bool, TrapBasedNullChecks,      false); // Not needed on x86.
  38 define_pd_global(bool, UncommonNullCast,         true);  // Uncommon-trap NULLs passed to check cast
  39 
  40 define_pd_global(bool, UseFastClassInitChecks,   LP64_ONLY( true ) NOT_LP64( false )); // not implemented on x86_32
  41 
  42 define_pd_global(uintx, CodeCacheSegmentSize,    64 TIERED_ONLY(+64)); // Tiered compilation has large code-entry alignment.
  43 // See 4827828 for this change. There is no globals_core_i486.hpp. I can't
  44 // assign a different value for C2 without touching a number of files. Use
  45 // #ifdef to minimize the change as it's late in Mantis. -- FIXME.
  46 // c1 doesn't have this problem because the fix to 4858033 assures us
  47 // the the vep is aligned at CodeEntryAlignment whereas c2 only aligns
  48 // the uep and the vep doesn't get real alignment but just slops on by
  49 // only assured that the entry instruction meets the 5 byte size requirement.
  50 #if COMPILER2_OR_JVMCI
  51 define_pd_global(intx, CodeEntryAlignment,       32);
  52 #else
  53 define_pd_global(intx, CodeEntryAlignment,       16);
  54 #endif // COMPILER2_OR_JVMCI
  55 define_pd_global(intx, OptoLoopAlignment,        16);
  56 define_pd_global(intx, InlineFrequencyCount,     100);
  57 define_pd_global(intx, InlineSmallCode,          1000);
  58 
  59 #define DEFAULT_STACK_YELLOW_PAGES (NOT_WINDOWS(2) WINDOWS_ONLY(3))
  60 #define DEFAULT_STACK_RED_PAGES (1)
  61 #define DEFAULT_STACK_RESERVED_PAGES (NOT_WINDOWS(1) WINDOWS_ONLY(0))


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