[kernel] Add fileOffset on FunctionExpression

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"
 
@@ skipping 600 matching lines @@
       intptr_t list_length = builder_->ReadListLength();  // read list length.
       for (intptr_t i = 0; i < list_length; ++i) {
         VisitExpression();  // read ith key.
         VisitExpression();  // read ith value.
       }
       return;
     }
     case kFunctionExpression: {
       intptr_t offset =
           builder_->ReaderOffset() - 1;  // -1 to include tag byte.
+      builder_->ReadPosition();          // read position.
       HandleLocalFunction(offset);       // read function node.
       return;
     }
     case kLet: {
       PositionScope scope(builder_->reader_);
       intptr_t offset =
           builder_->ReaderOffset() - 1;  // -1 to include tag byte.
 
       EnterScope(relative_kernel_offset_ + offset);
 
@@ skipping 3318 matching lines @@
       SkipDartType();                           // read key type.
       SkipDartType();                           // read value type.
       intptr_t list_length = ReadListLength();  // read list length.
       for (intptr_t i = 0; i < list_length; ++i) {
         SkipExpression();  // read ith key.
         SkipExpression();  // read ith value.
       }
       return;
     }
     case kFunctionExpression:
+      ReadPosition();      // read position.
       SkipFunctionNode();  // read function node.
       return;
     case kLet:
       SkipVariableDeclaration();  // read variable declaration.
       SkipExpression();           // read expression.
       return;
     case kVectorCreation:
       ReadUInt();  // read value.
       return;
     case kVectorGet:
@@ skipping 1762 matching lines @@
   const dart::Class& map_class =
       dart::Class::Handle(Z, dart::Library::LookupCoreClass(Symbols::Map()));
   const Function& factory_method = Function::ZoneHandle(
       Z, map_class.LookupFactory(
              dart::Library::PrivateCoreLibName(Symbols::MapLiteralFactory())));
 
   return instructions + StaticCall(position, factory_method, 2);
 }
 
 Fragment StreamingFlowGraphBuilder::BuildFunctionExpression() {
+  ReadPosition();  // read position.
   return BuildFunctionNode(TokenPosition::kNoSource, StringIndex());
 }
 
 Fragment StreamingFlowGraphBuilder::BuildLet(TokenPosition* position) {
   if (position != NULL) *position = TokenPosition::kNoSource;
 
   Fragment instructions = BuildVariableDeclaration();  // read variable.
   instructions += BuildExpression();                   // read body.
   return instructions;
 }
@@ skipping 1529 matching lines @@
     }
   }
 
   return Array::Handle(Array::null());
 }
 
 }  // namespace kernel
 }  // namespace dart
 
 #endif  // !defined(DART_PRECOMPILED_RUNTIME)