src/hotspot/cpu/aarch64/icache_aarch64.hpp

8248238: Adding Windows support to OpenJDK on AArch64

Summary: Adding Windows support for AArch64

Contributed-by: Ludovic Henry <luhenry@microsoft.com>, Monica Beckwith <monica.beckwith@microsoft.com>
Reviewed-by:

@@ -29,10 +29,19 @@
 // Interface for updating the instruction cache.  Whenever the VM
 // modifies code, part of the processor instruction cache potentially
 // has to be flushed.
 
 class ICache : public AbstractICache {
+ private:
+#ifdef _WIN64
+  // __builtin___clear_cache is a GCC intrinsic, and is then not available in
+  // MSVC. Define an equivalent method which calls the right Win32/MSVC
+  // intrinsic.
+  static void __builtin___clear_cache(char *start, char *end) {
+    FlushInstructionCache((HANDLE)GetCurrentProcess(), start, (SIZE_T)(end - start));
+  }
+#endif
  public:
   static void initialize();
   static void invalidate_word(address addr) {
     __builtin___clear_cache((char *)addr, (char *)(addr + 3));
   }