src/cpu/x86/vm/vtableStubs_x86_64.cpp

rev 3688 : 7054512: Compress class pointers after perm gen removal
Summary: support of compress class pointers in the compilers.
Reviewed-by:

*** 210,224 ****
  
  int VtableStub::pd_code_size_limit(bool is_vtable_stub) {
    if (is_vtable_stub) {
      // Vtable stub size
      return (DebugVtables ? 512 : 24) + (CountCompiledCalls ? 13 : 0) +
!            (UseCompressedOops ? 16 : 0);  // 1 leaq can be 3 bytes + 1 long
    } else {
      // Itable stub size
      return (DebugVtables ? 512 : 74) + (CountCompiledCalls ? 13 : 0) +
!            (UseCompressedOops ? 32 : 0);  // 2 leaqs
    }
    // In order to tune these parameters, run the JVM with VM options
    // +PrintMiscellaneous and +WizardMode to see information about
    // actual itable stubs.  Look for lines like this:
    //   itable #1 at 0x5551212[71] left over: 3
--- 210,224 ----
  
  int VtableStub::pd_code_size_limit(bool is_vtable_stub) {
    if (is_vtable_stub) {
      // Vtable stub size
      return (DebugVtables ? 512 : 24) + (CountCompiledCalls ? 13 : 0) +
!            (UseCompressedKlassPointers ? 16 : 0);  // 1 leaq can be 3 bytes + 1 long
    } else {
      // Itable stub size
      return (DebugVtables ? 512 : 74) + (CountCompiledCalls ? 13 : 0) +
!            (UseCompressedKlassPointers ? 32 : 0);  // 2 leaqs
    }
    // In order to tune these parameters, run the JVM with VM options
    // +PrintMiscellaneous and +WizardMode to see information about
    // actual itable stubs.  Look for lines like this:
    //   itable #1 at 0x5551212[71] left over: 3