8219974: REDO JDK-8219492: Restore static callsite resolution for the current class

Reviewed-by: redestad, vlivanov, coleenp

src/hotspot/share/interpreter/interpreterRuntime.cpp

@@ -920,19 +920,23 @@ void InterpreterRuntime::resolve_invoke(JavaThread* thread, Bytecodes::Code byte
            info.call_kind() == CallInfo::vtable_call, "");
   }
 #endif
-  // Get sender or sender's unsafe_anonymous_host, and only set cpCache entry to resolved if
-  // it is not an interface.  The receiver for invokespecial calls within interface
-  // methods must be checked for every call.
-  InstanceKlass* sender = pool->pool_holder();
-  sender = sender->is_unsafe_anonymous() ? sender->unsafe_anonymous_host() : sender;
 
   switch (info.call_kind()) {
-  case CallInfo::direct_call:
+  case CallInfo::direct_call: {
+    // Get sender or sender's unsafe_anonymous_host, and only set cpCache entry to resolved if
+    // it is not an interface.  The receiver for invokespecial calls within interface
+    // methods must be checked for every call.
+    InstanceKlass* pool_holder = pool->pool_holder();
+    InstanceKlass* sender = pool_holder->is_unsafe_anonymous() ?
+                              pool_holder->unsafe_anonymous_host() : pool_holder;
+
     cp_cache_entry->set_direct_call(
       bytecode,
       info.resolved_method(),
-      sender->is_interface());
+      sender->is_interface(),
+      pool_holder);
     break;
+  }
   case CallInfo::vtable_call:
     cp_cache_entry->set_vtable_call(
       bytecode,

src/hotspot/share/oops/cpCache.cpp

@@ -168,7 +168,8 @@ void ConstantPoolCacheEntry::set_parameter_size(int value) {
 void ConstantPoolCacheEntry::set_direct_or_vtable_call(Bytecodes::Code invoke_code,
                                                        const methodHandle& method,
                                                        int vtable_index,
-                                                       bool sender_is_interface) {
+                                                       bool sender_is_interface,
+                                                       InstanceKlass* pool_holder) {
   bool is_vtable_call = (vtable_index >= 0);  // FIXME: split this method on this boolean
   assert(method->interpreter_entry() != NULL, "should have been set at this point");
   assert(!method->is_obsolete(),  "attempt to write obsolete method to cpCache");
@@ -263,9 +264,17 @@ void ConstantPoolCacheEntry::set_direct_or_vtable_call(Bytecodes::Code invoke_co
     }
     // Don't mark invokestatic to method as resolved if the holder class has not yet completed
     // initialization. An invokestatic must only proceed if the class is initialized, but if
-    // we resolve it before then that class initialization check is skipped.
-    if (invoke_code == Bytecodes::_invokestatic && !method->method_holder()->is_initialized()) {
-      do_resolve = false;
+    // we resolve it before then that class initialization check is skipped. However if the call
+    // is from the same class we can resolve as we must be executing with <clinit> on our call stack.
+    if (invoke_code == Bytecodes::_invokestatic) {
+      if (!method->method_holder()->is_initialized() &&
+          method->method_holder() != pool_holder) {
+        do_resolve = false;
+      } else {
+        assert(method->method_holder()->is_initialized() ||
+               method->method_holder()->is_reentrant_initialization(Thread::current()),
+               "invalid class initialization state for invoke_static");
+      }
     }
     if (do_resolve) {
       set_bytecode_1(invoke_code);
@@ -310,17 +319,17 @@ void ConstantPoolCacheEntry::set_direct_or_vtable_call(Bytecodes::Code invoke_co
 }
 
 void ConstantPoolCacheEntry::set_direct_call(Bytecodes::Code invoke_code, const methodHandle& method,
-                                             bool sender_is_interface) {
+                                             bool sender_is_interface, InstanceKlass* pool_holder) {
   int index = Method::nonvirtual_vtable_index;
   // index < 0; FIXME: inline and customize set_direct_or_vtable_call
-  set_direct_or_vtable_call(invoke_code, method, index, sender_is_interface);
+  set_direct_or_vtable_call(invoke_code, method, index, sender_is_interface, pool_holder);
 }
 
 void ConstantPoolCacheEntry::set_vtable_call(Bytecodes::Code invoke_code, const methodHandle& method, int index) {
   // either the method is a miranda or its holder should accept the given index
   assert(method->method_holder()->is_interface() || method->method_holder()->verify_vtable_index(index), "");
   // index >= 0; FIXME: inline and customize set_direct_or_vtable_call
-  set_direct_or_vtable_call(invoke_code, method, index, false);
+  set_direct_or_vtable_call(invoke_code, method, index, false, NULL /* not used */);
 }
 
 void ConstantPoolCacheEntry::set_itable_call(Bytecodes::Code invoke_code,

src/hotspot/share/oops/cpCache.hpp

@@ -230,14 +230,16 @@ class ConstantPoolCacheEntry {
     Bytecodes::Code invoke_code,                 // the bytecode used for invoking the method
     const methodHandle& method,                  // the method/prototype if any (NULL, otherwise)
     int             vtable_index,                // the vtable index if any, else negative
-    bool            sender_is_interface
+    bool            sender_is_interface,         // 'logical' sender (may be host of VMAC)
+    InstanceKlass*  pool_holder                  // class from which the call is made
   );
 
  public:
   void set_direct_call(                          // sets entry to exact concrete method entry
     Bytecodes::Code invoke_code,                 // the bytecode used for invoking the method
     const methodHandle& method,                  // the method to call
-    bool            sender_is_interface
+    bool            sender_is_interface,         // 'logical' sender (may be host of VMAC)
+    InstanceKlass*  pool_holder                  // class from which the call is made
   );
 
   void set_vtable_call(                          // sets entry to vtable index

src/hotspot/share/runtime/sharedRuntime.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -1376,12 +1376,18 @@ methodHandle SharedRuntime::resolve_sub_helper(JavaThread *thread,
   }
 #endif
 
-  // Do not patch call site for static call when the class is not
-  // fully initialized.
-  if (invoke_code == Bytecodes::_invokestatic &&
-      !callee_method->method_holder()->is_initialized()) {
-    assert(callee_method->method_holder()->is_linked(), "must be");
-    return callee_method;
+  // Do not patch call site for static call to another class
+  // when the class is not fully initialized.
+  if (invoke_code == Bytecodes::_invokestatic) {
+    if (!callee_method->method_holder()->is_initialized() &&
+        callee_method->method_holder() != caller_nm->method()->method_holder()) {
+      assert(callee_method->method_holder()->is_linked(), "must be");
+      return callee_method;
+    } else {
+      assert(callee_method->method_holder()->is_initialized() ||
+             callee_method->method_holder()->is_reentrant_initialization(thread),
+             "invalid class initialization state for invoke_static");
+    }
   }
 
   // JSR 292 key invariant: