[kernel] Position on switch expression

runtime/vm/kernel_binary_flowgraph.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 "vm/kernel_binary_flowgraph.h"
 #include "vm/compiler.h"
 #include "vm/longjump.h"
 #include "vm/object_store.h"
 
 #if !defined(DART_PRECOMPILED_RUNTIME)
@@ skipping 1262 matching lines @@
       }
       // TODO(jensj): From kernel_binary.cc
       // forinstmt->variable_->set_end_position(forinstmt->position_);
       ExitScope(body_position, builder_->reader_->max_position());
       --depth_.loop_;
       --depth_.for_in_;
       return;
     }
     case kSwitchStatement: {
       AddSwitchVariable();
+      builder_->ReadPosition();                     // read position.
       VisitExpression();                            // read condition.
       int case_count = builder_->ReadListLength();  // read number of cases.
       for (intptr_t i = 0; i < case_count; ++i) {
         int expression_count =
             builder_->ReadListLength();  // read number of expressions.
         for (intptr_t j = 0; j < expression_count; ++j) {
           builder_->ReadPosition();  // read jth position.
           VisitExpression();         // read jth expression.
         }
         builder_->ReadBool();  // read is_default.
@@ skipping 3263 matching lines @@
     }
     case kForInStatement:
     case kAsyncForInStatement:
       ReadPosition();             // read position.
       ReadPosition();             // read body position.
       SkipVariableDeclaration();  // read variable.
       SkipExpression();           // read iterable.
       SkipStatement();            // read body.
       return;
     case kSwitchStatement: {
+      ReadPosition();                     // read position.
       SkipExpression();                   // read condition.
       int case_count = ReadListLength();  // read number of cases.
       for (intptr_t i = 0; i < case_count; ++i) {
         int expression_count = ReadListLength();  // read number of expressions.
         for (intptr_t j = 0; j < expression_count; ++j) {
           ReadPosition();    // read jth position.
           SkipExpression();  // read jth expression.
         }
         ReadBool();       // read is_default.
         SkipStatement();  // read body.
@@ skipping 2167 matching lines @@
   } else {
     instructions += condition;
   }
 
   loop_depth_dec();
   for_in_depth_dec();
   return Fragment(instructions.entry, loop_exit);
 }
 
 Fragment StreamingFlowGraphBuilder::BuildSwitchStatement() {
+  ReadPosition();  // read position.
   // We need the number of cases. So start by getting that, then go back.
   intptr_t offset = ReaderOffset();
   SkipExpression();                   // temporarily skip condition
   int case_count = ReadListLength();  // read number of cases.
   SetOffset(offset);
 
   SwitchBlock block(flow_graph_builder_, case_count);
 
   // Instead of using a variable we should reuse the expression on the stack,
   // since it won't be assigned again, we don't need phi nodes.
@@ skipping 1049 matching lines @@
     }
   }
 
   return Array::Handle(Array::null());
 }
 
 }  // namespace kernel
 }  // namespace dart
 
 #endif  // !defined(DART_PRECOMPILED_RUNTIME)