[kernel] Add offset to SwitchContinueStatement; add debugging test

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 1278 matching lines @@
         for (intptr_t j = 0; j < expression_count; ++j) {
           builder_->ReadPosition();  // read jth position.
           VisitExpression();         // read jth expression.
         }
         builder_->ReadBool();  // read is_default.
         VisitStatement();      // read body.
       }
       return;
     }
     case kContinueSwitchStatement:
-      builder_->ReadUInt();  // read target_index.
+      builder_->ReadPosition();  // read position.
+      builder_->ReadUInt();      // read target_index.
       return;
     case kIfStatement:
       VisitExpression();  // read condition.
       VisitStatement();   // read then.
       VisitStatement();   // read otherwise.
       return;
     case kReturnStatement: {
       if ((depth_.function_ == 0) && (depth_.finally_ > 0) &&
           (result_->finally_return_variable == NULL)) {
         const String& name = H.DartSymbol(":try_finally_return_value");
@@ skipping 3262 matching lines @@
         for (intptr_t j = 0; j < expression_count; ++j) {
           ReadPosition();    // read jth position.
           SkipExpression();  // read jth expression.
         }
         ReadBool();       // read is_default.
         SkipStatement();  // read body.
       }
       return;
     }
     case kContinueSwitchStatement:
-      ReadUInt();  // read target_index.
+      ReadPosition();  // read position.
+      ReadUInt();      // read target_index.
       return;
     case kIfStatement:
       SkipExpression();  // read condition.
       SkipStatement();   // read then.
       SkipStatement();   // read otherwise.
       return;
     case kReturnStatement: {
       ReadPosition();       // read position
       Tag tag = ReadTag();  // read (first part of) expression.
       if (tag == kSomething) {
@@ skipping 2358 matching lines @@
   }
 
   delete[] body_fragments;
   delete[] case_expression_offsets;
 
   SetOffset(end_offset);
   return Fragment(head_instructions.entry, current_instructions.current);
 }
 
 Fragment StreamingFlowGraphBuilder::BuildContinueSwitchStatement() {
-  intptr_t target_index = ReadUInt();  // read target index.
+  TokenPosition position = ReadPosition();  // read position.
+  intptr_t target_index = ReadUInt();       // read target index.
 
   TryFinallyBlock* outer_finally = NULL;
   intptr_t target_context_depth = -1;
   JoinEntryInstr* entry = switch_block()->Destination(
       target_index, &outer_finally, &target_context_depth);
 
   Fragment instructions;
   instructions +=
       TranslateFinallyFinalizers(outer_finally, target_context_depth);
   if (instructions.is_open()) {
+    if (NeedsDebugStepCheck(parsed_function()->function(), position)) {
+      instructions += DebugStepCheck(position);
+    }
     instructions += Goto(entry);
   }
   return instructions;
 }
 
 Fragment StreamingFlowGraphBuilder::BuildIfStatement() {
   bool negate;
   Fragment instructions = TranslateCondition(&negate);  // read condition.
   TargetEntryInstr* then_entry;
   TargetEntryInstr* otherwise_entry;
@@ skipping 833 matching lines @@
     }
   }
 
   return Array::Handle(Array::null());
 }
 
 }  // namespace kernel
 }  // namespace dart
 
 #endif  // !defined(DART_PRECOMPILED_RUNTIME)