jdk8-mips64-public/hotspot: src/cpu/x86/vm/icache

8229345: Memory leak due to vtable stubs not being shared on SPARC
Reviewed-by: mdoerr, dholmes, kvn

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    25 #ifndef CPU_X86_VM_ICACHE_X86_HPP

    26 #define CPU_X86_VM_ICACHE_X86_HPP

    28 // Interface for updating the instruction cache.  Whenever the VM modifies

    29 // code, part of the processor instruction cache potentially has to be flushed.

    31 // On the x86, this is a no-op -- the I-cache is guaranteed to be consistent

    32 // after the next jump, and the VM never modifies instructions directly ahead

    33 // of the instruction fetch path.

    35 // [phh] It's not clear that the above comment is correct, because on an MP

    36 // system where the dcaches are not snooped, only the thread doing the invalidate

    37 // will see the update.  Even in the snooped case, a memory fence would be

    38 // necessary if stores weren't ordered.  Fortunately, they are on all known

    39 // x86 implementations.

    41 class ICache : public AbstractICache {

    42  public:

    43 #ifdef AMD64

    44   enum {

    45     stub_size      = 64, // Size of the icache flush stub in bytes

    46     line_size      = 64, // Icache line size in bytes

    47     log2_line_size = 6   // log2(line_size)

    48   };

    50   // Use default implementation

    51 #else

    52   enum {

    53     stub_size      = 16,                 // Size of the icache flush stub in bytes

    54     line_size      = BytesPerWord,      // conservative

    55     log2_line_size = LogBytesPerWord    // log2(line_size)

    56   };

    57 #endif // AMD64

    58 };

    60 #endif // CPU_X86_VM_ICACHE_X86_HPP

src/cpu/x86/vm/icache_x86.hpp@bb1da64b0492