Make breakpoints on == fire reliably

runtime/vm/code_generator.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/code_generator.h"
 
 #include "vm/assembler.h"
 #include "vm/ast.h"
 #include "vm/bigint_operations.h"
 #include "vm/code_patcher.h"
@@ skipping 797 matching lines @@
 // Gets called from debug stub when code reaches a breakpoint before
 // calling a closure.
 DEFINE_RUNTIME_ENTRY(BreakpointClosureHandler, 0) {
   ASSERT(arguments.ArgCount() ==
          kBreakpointClosureHandlerRuntimeEntry.argument_count());
   ASSERT(isolate->debugger() != NULL);
   isolate->debugger()->SignalBpReached();
 }
 
 
+// Gets called from debug stub when code reaches a breakpoint
+// at the stub call to update the ic cache on equality comparison
+// with null.
+DEFINE_RUNTIME_ENTRY(BreakpointEqualNullHandler, 0) {
+  ASSERT(arguments.ArgCount() ==
+         kBreakpointEqualNullHandlerRuntimeEntry.argument_count());
+  ASSERT(isolate->debugger() != NULL);
+  isolate->debugger()->SignalBpReached();
+}
+
+
 // Gets called from debug stub when code reaches a breakpoint.
 DEFINE_RUNTIME_ENTRY(BreakpointStaticHandler, 0) {
   ASSERT(arguments.ArgCount() ==
       kBreakpointStaticHandlerRuntimeEntry.argument_count());
   ASSERT(isolate->debugger() != NULL);
   isolate->debugger()->SignalBpReached();
   // Make sure the static function that is about to be called is
   // compiled. The stub will jump to the entry point without any
   // further tests.
   DartFrameIterator iterator;
@@ skipping 929 matching lines @@
 //   Arg1: Value that is being stored.
 DEFINE_RUNTIME_ENTRY(UpdateFieldCid, 2) {
   ASSERT(arguments.ArgCount() == kUpdateFieldCidRuntimeEntry.argument_count());
   const Field& field = Field::CheckedHandle(arguments.ArgAt(0));
   const Object& value = Object::Handle(arguments.ArgAt(1));
 
   field.UpdateCid(Class::Handle(value.clazz()).id());
 }
 
 }  // namespace dart