7085860: JSR 292: implement CallSite.setTargetNormal and setTargetVolatile as native methods

Reviewed-by: jrose, never

src/share/vm/classfile/javaClasses.cpp

@@ -2707,14 +2707,6 @@ void java_lang_invoke_CallSite::compute_offsets() {
   }
 }
 
-oop java_lang_invoke_CallSite::target(oop site) {
-  return site->obj_field(_target_offset);
-}
-
-void java_lang_invoke_CallSite::set_target(oop site, oop target) {
-  site->obj_field_put(_target_offset, target);
-}
-
 
 // Support for java_security_AccessControlContext
 

src/share/vm/classfile/javaClasses.hpp

@@ -771,7 +771,7 @@ class java_lang_ref_Reference: AllStatic {
     ref->obj_field_put(referent_offset, value);
   }
   static void set_referent_raw(oop ref, oop value) {
-    ref->obj_field_raw_put(referent_offset, value);
+    ref->obj_field_put_raw(referent_offset, value);
   }
   static HeapWord* referent_addr(oop ref) {
     return ref->obj_field_addr<HeapWord>(referent_offset);
@@ -783,7 +783,7 @@ class java_lang_ref_Reference: AllStatic {
     ref->obj_field_put(next_offset, value);
   }
   static void set_next_raw(oop ref, oop value) {
-    ref->obj_field_raw_put(next_offset, value);
+    ref->obj_field_put_raw(next_offset, value);
   }
   static HeapWord* next_addr(oop ref) {
     return ref->obj_field_addr<HeapWord>(next_offset);
@@ -795,7 +795,7 @@ class java_lang_ref_Reference: AllStatic {
     ref->obj_field_put(discovered_offset, value);
   }
   static void set_discovered_raw(oop ref, oop value) {
-    ref->obj_field_raw_put(discovered_offset, value);
+    ref->obj_field_put_raw(discovered_offset, value);
   }
   static HeapWord* discovered_addr(oop ref) {
     return ref->obj_field_addr<HeapWord>(discovered_offset);
@@ -1163,8 +1163,11 @@ private:
 
 public:
   // Accessors
-  static oop            target(oop site);
-  static void       set_target(oop site, oop target);
+  static oop              target(         oop site)             { return site->obj_field(             _target_offset);         }
+  static void         set_target(         oop site, oop target) {        site->obj_field_put(         _target_offset, target); }
+
+  static volatile oop     target_volatile(oop site)             { return site->obj_field_volatile(    _target_offset);         }
+  static void         set_target_volatile(oop site, oop target) {        site->obj_field_put_volatile(_target_offset, target); }
 
   static oop              caller_method(oop site);
   static void         set_caller_method(oop site, oop ref);

src/share/vm/oops/klassOop.hpp

@@ -53,8 +53,10 @@ class klassOopDesc : public oopDesc {
  private:
   // These have no implementation since klassOop should never be accessed in this fashion
   oop obj_field(int offset) const;
+  volatile oop obj_field_volatile(int offset) const;
   void obj_field_put(int offset, oop value);
-  void obj_field_raw_put(int offset, oop value);
+  void obj_field_put_raw(int offset, oop value);
+  void obj_field_put_volatile(int offset, oop value);
 
   jbyte byte_field(int offset) const;
   void byte_field_put(int offset, jbyte contents);

src/share/vm/oops/oop.hpp

@@ -214,8 +214,10 @@ class oopDesc {
 
   // Access to fields in a instanceOop through these methods.
   oop obj_field(int offset) const;
+  volatile oop obj_field_volatile(int offset) const;
   void obj_field_put(int offset, oop value);
-  void obj_field_raw_put(int offset, oop value);
+  void obj_field_put_raw(int offset, oop value);
+  void obj_field_put_volatile(int offset, oop value);
 
   jbyte byte_field(int offset) const;
   void byte_field_put(int offset, jbyte contents);

src/share/vm/oops/oop.inline.hpp

@@ -321,15 +321,25 @@ inline oop oopDesc::obj_field(int offset) const {
     load_decode_heap_oop(obj_field_addr<narrowOop>(offset)) :
     load_decode_heap_oop(obj_field_addr<oop>(offset));
 }
+inline volatile oop oopDesc::obj_field_volatile(int offset) const {
+  volatile oop value = obj_field(offset);
+  OrderAccess::acquire();
+  return value;
+}
 inline void oopDesc::obj_field_put(int offset, oop value) {
   UseCompressedOops ? oop_store(obj_field_addr<narrowOop>(offset), value) :
                       oop_store(obj_field_addr<oop>(offset),       value);
 }
-inline void oopDesc::obj_field_raw_put(int offset, oop value) {
+inline void oopDesc::obj_field_put_raw(int offset, oop value) {
   UseCompressedOops ?
     encode_store_heap_oop(obj_field_addr<narrowOop>(offset), value) :
     encode_store_heap_oop(obj_field_addr<oop>(offset),       value);
 }
+inline void oopDesc::obj_field_put_volatile(int offset, oop value) {
+  OrderAccess::release();
+  obj_field_put(offset, value);
+  OrderAccess::fence();
+}
 
 inline jbyte oopDesc::byte_field(int offset) const                  { return (jbyte) *byte_field_addr(offset);    }
 inline void oopDesc::byte_field_put(int offset, jbyte contents)     { *byte_field_addr(offset) = (jint) contents; }

src/share/vm/prims/methodHandles.cpp

@@ -3081,6 +3081,30 @@ JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls,
 }
 JVM_END
 
+JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
+  oop call_site = JNIHandles::resolve_non_null(call_site_jh);
+  oop target    = JNIHandles::resolve(target_jh);
+  {
+    // Walk all nmethods depending on this call site.
+    MutexLocker mu(Compile_lock, thread);
+    Universe::flush_dependents_on(call_site, target);
+  }
+  java_lang_invoke_CallSite::set_target(call_site, target);
+}
+JVM_END
+
+JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
+  oop call_site = JNIHandles::resolve_non_null(call_site_jh);
+  oop target    = JNIHandles::resolve(target_jh);
+  {
+    // Walk all nmethods depending on this call site.
+    MutexLocker mu(Compile_lock, thread);
+    Universe::flush_dependents_on(call_site, target);
+  }
+  java_lang_invoke_CallSite::set_target_volatile(call_site, target);
+}
+JVM_END
+
 methodOop MethodHandles::resolve_raise_exception_method(TRAPS) {
   if (_raise_exception_method != NULL) {
     // no need to do it twice
@@ -3137,12 +3161,15 @@ JVM_END
 
 /// JVM_RegisterMethodHandleMethods
 
+#undef CS  // Solaris builds complain
+
 #define LANG "Ljava/lang/"
 #define JLINV "Ljava/lang/invoke/"
 
 #define OBJ   LANG"Object;"
 #define CLS   LANG"Class;"
 #define STRG  LANG"String;"
+#define CS    JLINV"CallSite;"
 #define MT    JLINV"MethodType;"
 #define MH    JLINV"MethodHandle;"
 #define MEM   JLINV"MemberName;"
@@ -3153,7 +3180,7 @@ JVM_END
 #define CC (char*)  /*cast a literal from (const char*)*/
 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
 
-// These are the native methods on sun.invoke.MethodHandleNatives.
+// These are the native methods on java.lang.invoke.MethodHandleNatives.
 static JNINativeMethod methods[] = {
   // void init(MemberName self, AccessibleObject ref)
   {CC"init",                      CC"("AMH""MH"I)V",                     FN_PTR(MHN_init_AMH)},
@@ -3172,6 +3199,11 @@ static JNINativeMethod methods[] = {
   {CC"getMembers",                CC"("CLS""STRG""STRG"I"CLS"I["MEM")I", FN_PTR(MHN_getMembers)}
 };
 
+static JNINativeMethod call_site_methods[] = {
+  {CC"setCallSiteTargetNormal",   CC"("CS""MH")V",                       FN_PTR(MHN_setCallSiteTargetNormal)},
+  {CC"setCallSiteTargetVolatile", CC"("CS""MH")V",                       FN_PTR(MHN_setCallSiteTargetVolatile)}
+};
+
 static JNINativeMethod invoke_methods[] = {
   // void init(MemberName self, AccessibleObject ref)
   {CC"invoke",                    CC"(["OBJ")"OBJ,                       FN_PTR(MH_invoke_UOE)},
@@ -3188,11 +3220,11 @@ JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class))
     return;  // bind nothing
   }
 
+  assert(!MethodHandles::enabled(), "must not be enabled");
   bool enable_MH = true;
 
   {
     ThreadToNativeFromVM ttnfv(thread);
-
     int status = env->RegisterNatives(MHN_class, methods, sizeof(methods)/sizeof(JNINativeMethod));
     if (!env->ExceptionOccurred()) {
       const char* L_MH_name = (JLINV "MethodHandle");
@@ -3201,11 +3233,16 @@ JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class))
       status = env->RegisterNatives(MH_class, invoke_methods, sizeof(invoke_methods)/sizeof(JNINativeMethod));
     }
     if (env->ExceptionOccurred()) {
-      MethodHandles::set_enabled(false);
       warning("JSR 292 method handle code is mismatched to this JVM.  Disabling support.");
       enable_MH = false;
       env->ExceptionClear();
     }
+
+    status = env->RegisterNatives(MHN_class, call_site_methods, sizeof(call_site_methods)/sizeof(JNINativeMethod));
+    if (env->ExceptionOccurred()) {
+      // Exception is okay until 7087357
+      env->ExceptionClear();
+    }
   }
 
   if (enable_MH) {