[kernel] Debugging of switch statement

runtime/vm/kernel_to_il.cc

 // Copyright (c) 2016, 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 <map>
 #include <set>
 #include <string>
 
 #include "vm/kernel_to_il.h"
 
@@ skipping 5792 matching lines @@
       JoinEntryInstr* body_join = NULL;
       if (block.HadJumper(switch_case)) {
         body_join = block.Destination(switch_case);
         body_fragments[i] = Fragment(body_join) + body_fragments[i];
       }
 
       for (intptr_t j = 0; j < switch_case->expressions().length(); j++) {
         TargetEntryInstr* then;
         TargetEntryInstr* otherwise;
 
-        current_instructions += Constant(constant_evaluator_.EvaluateExpression(
-            switch_case->expressions()[j]));
+        Expression* expression = switch_case->expressions()[j];
+        current_instructions +=
+            Constant(constant_evaluator_.EvaluateExpression(expression));
         current_instructions += PushArgument();
         current_instructions += LoadLocal(scopes_->switch_variable);
         current_instructions += PushArgument();
         current_instructions += InstanceCall(
-            TokenPosition::kNoSource, Symbols::EqualOperator(), Token::kEQ,
+            expression->position(), Symbols::EqualOperator(), Token::kEQ,
             /*argument_count=*/2,
             /*num_args_checked=*/2);
         current_instructions += BranchIfTrue(&then, &otherwise);
 
         Fragment then_fragment(then);
 
         if (body_join != NULL) {
           // There are several branches to the body, so we will make a goto to
           // the join block (the real body has already been prepended with a
           // join instruction).
@@ skipping 609 matching lines @@
     thread->clear_sticky_error();
     return error.raw();
   }
 }
 
 
 }  // namespace kernel
 }  // namespace dart
 
 #endif  // !defined(DART_PRECOMPILED_RUNTIME)