jdk-sandbox: comparison hotspot/src/share/vm/oops/methodDataOop.hpp

equal deleted inserted replaced

-:7c8755dd5bb2
+:e977b527544a
 /*
-* Copyright 2000-2009 Sun Microsystems, Inc.  All Rights Reserved.
+* Copyright 2000-2010 Sun Microsystems, Inc.  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
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 }
 static ByteSize counter_data_size() {
 return cell_offset(counter_cell_count);
 }
+void set_count(uint count) {
+set_uint_at(count_off, count);
+}
 #ifndef PRODUCT
 void print_data_on(outputStream* st);
 #endif
 };
 set_uint_at(receiver_count_cell_index(row), count);
 }
 void clear_row(uint row) {
 assert(row < row_limit(), "oob");
+// Clear total count - indicator of polymorphic call site.
+// The site may look like as monomorphic after that but
+// it allow to have more accurate profiling information because
+// there was execution phase change since klasses were unloaded.
+// If the site is still polymorphic then MDO will be updated
+// to reflect it. But it could be the case that the site becomes
+// only bimorphic. Then keeping total count not 0 will be wrong.
+// Even if we use monomorphic (when it is not) for compilation
+// we will only have trap, deoptimization and recompile again
+// with updated MDO after executing method in Interpreter.
+// An additional receiver will be recorded in the cleaned row
+// during next call execution.
+//
+// Note: our profiling logic works with empty rows in any slot.
+// We do sorting a profiling info (ciCallProfile) for compilation.
+//
+set_count(0);
 set_receiver(row, NULL);
 set_receiver_count(row, 0);
 }
 // Code generation support

changeset 4892	e977b527544a
parent 4754	8aef16f24e16
child 5547	f4b087cbb361