src/hotspot/cpu/x86/macroAssembler_x86.cpp

rev 47415 : Add Thread Local handshakes and thread local polling

*** 36,45 ****
--- 36,47 ----
  #include "prims/methodHandles.hpp"
  #include "runtime/biasedLocking.hpp"
  #include "runtime/interfaceSupport.hpp"
  #include "runtime/objectMonitor.hpp"
  #include "runtime/os.hpp"
+ #include "runtime/safepoint.hpp"
+ #include "runtime/safepointMechanism.hpp"
  #include "runtime/sharedRuntime.hpp"
  #include "runtime/stubRoutines.hpp"
  #include "runtime/thread.hpp"
  #include "utilities/macros.hpp"
  #if INCLUDE_ALL_GCS
*** 3742,3751 ****
--- 3744,3772 ----
  
    // Size of store must match masking code above
    movl(as_Address(ArrayAddress(page, index)), tmp);
  }
  
+ #ifdef _LP64
+ void MacroAssembler::safepoint_poll(Label& slow_path, Register thread_reg, Register temp_reg) {
+   if (SafepointMechanism::uses_thread_local_poll()) {
+     testb(Address(r15_thread, Thread::polling_page_offset()), SafepointMechanism::poll_bit());
+     jcc(Assembler::notZero, slow_path); // handshake bit set implies poll
+   } else {
+     cmp32(ExternalAddress(SafepointSynchronize::address_of_state()),
+         SafepointSynchronize::_not_synchronized);
+     jcc(Assembler::notEqual, slow_path);
+   }
+ }
+ #else
+ void MacroAssembler::safepoint_poll(Label& slow_path) {
+   cmp32(ExternalAddress(SafepointSynchronize::address_of_state()),
+       SafepointSynchronize::_not_synchronized);
+   jcc(Assembler::notEqual, slow_path);
+ }
+ #endif
+ 
  // Calls to C land
  //
  // When entering C land, the rbp, & rsp of the last Java frame have to be recorded
  // in the (thread-local) JavaThread object. When leaving C land, the last Java fp
  // has to be reset to 0. This is required to allow proper stack traversal.