[kernel] Stream everything. Replace .kernel_function with .kernel_offset

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 <set>
 
 #include "vm/kernel_to_il.h"
 
 #include "vm/compiler.h"
 #include "vm/intermediate_language.h"
@@ skipping 12 matching lines @@
 DECLARE_FLAG(bool, support_externalizable_strings);
 
 namespace kernel {
 
 #define Z (zone_)
 #define H (translation_helper_)
 #define T (type_translator_)
 #define I Isolate::Current()
 
 
-static void DiscoverEnclosingElements(Zone* zone,
-                                      const Function& function,
-                                      Function* outermost_function,
-                                      TreeNode** outermost_node,
-                                      Class** klass) {
-  // Find out if there is an enclosing kernel class (which will be used to
-  // resolve type parameters).
-  *outermost_function = function.raw();
-  while (outermost_function->parent_function() != Object::null()) {
-    *outermost_function = outermost_function->parent_function();
-  }
-  *outermost_node =
-      static_cast<TreeNode*>(outermost_function->kernel_function());
-  if (*outermost_node != NULL) {
-    TreeNode* parent = NULL;
-    if ((*outermost_node)->IsProcedure()) {
-      parent = Procedure::Cast(*outermost_node)->parent();
-    } else if ((*outermost_node)->IsConstructor()) {
-      parent = Constructor::Cast(*outermost_node)->parent();
-    } else if ((*outermost_node)->IsField()) {
-      parent = Field::Cast(*outermost_node)->parent();
-    }
-    if (parent != NULL && parent->IsClass()) *klass = Class::Cast(parent);
-  }
-}
-
-
-static bool IsStaticInitializer(const Function& function, Zone* zone) {
-  return (function.kind() == RawFunction::kImplicitStaticFinalGetter) &&
-         dart::String::Handle(zone, function.name())
-             .StartsWith(Symbols::InitPrefix());
-}
-
-
 Fragment& Fragment::operator+=(const Fragment& other) {
   if (entry == NULL) {
     entry = other.entry;
     current = other.current;
   } else if (current != NULL && other.entry != NULL) {
     current->LinkTo(other.entry);
     current = other.current;
   }
   return *this;
 }
@@ skipping 600 matching lines @@
   if (named->length() == 0) return Array::ZoneHandle(Z);
 
   const Array& names =
       Array::ZoneHandle(Z, Array::New(named->length(), Heap::kOld));
   for (intptr_t i = 0; i < named->length(); ++i) {
     names.SetAt(i, DartSymbol((*named)[i]->name()));
   }
   return names;
 }
 
-ConstantEvaluator::ConstantEvaluator(FlowGraphBuilder* builder,
-                                     Zone* zone,
-                                     TranslationHelper* h,
-                                     DartTypeTranslator* type_translator)
-    : builder_(builder),
-      isolate_(Isolate::Current()),
-      zone_(zone),
-      translation_helper_(*h),
-      type_translator_(*type_translator),
-      script_(Script::Handle(
-          zone,
-          builder == NULL ? Script::null()
-                          : builder_->parsed_function_->function().script())),
-      result_(Instance::Handle(zone)) {}
-
-
-Instance& ConstantEvaluator::EvaluateExpression(Expression* expression) {
-  if (!GetCachedConstant(expression, &result_)) {
-    expression->AcceptExpressionVisitor(this);
-    CacheConstantValue(expression, result_);
-  }
-  // We return a new `ZoneHandle` here on purpose: The intermediate language
-  // instructions do not make a copy of the handle, so we do it.
-  return Instance::ZoneHandle(Z, result_.raw());
-}
-
-
-Object& ConstantEvaluator::EvaluateExpressionSafe(Expression* expression) {
-  LongJumpScope jump;
-  if (setjmp(*jump.Set()) == 0) {
-    return EvaluateExpression(expression);
-  } else {
-    Thread* thread = H.thread();
-    Error& error = Error::Handle(Z);
-    error = thread->sticky_error();
-    thread->clear_sticky_error();
-    return error;
-  }
-}
-
-
-Instance& ConstantEvaluator::EvaluateConstructorInvocation(
-    ConstructorInvocation* node) {
-  if (!GetCachedConstant(node, &result_)) {
-    VisitConstructorInvocation(node);
-    CacheConstantValue(node, result_);
-  }
-  // We return a new `ZoneHandle` here on purpose: The intermediate language
-  // instructions do not make a copy of the handle, so we do it.
-  return Instance::ZoneHandle(Z, result_.raw());
-}
-
-
-Instance& ConstantEvaluator::EvaluateListLiteral(ListLiteral* node) {
-  if (!GetCachedConstant(node, &result_)) {
-    VisitListLiteral(node);
-    CacheConstantValue(node, result_);
-  }
-  // We return a new `ZoneHandle` here on purpose: The intermediate language
-  // instructions do not make a copy of the handle, so we do it.
-  return Instance::ZoneHandle(Z, result_.raw());
-}
-
-
-Instance& ConstantEvaluator::EvaluateMapLiteral(MapLiteral* node) {
-  if (!GetCachedConstant(node, &result_)) {
-    VisitMapLiteral(node);
-    CacheConstantValue(node, result_);
-  }
-  // We return a new `ZoneHandle` here on purpose: The intermediate language
-  // instructions do not make a copy of the handle, so we do it.
-  return Instance::ZoneHandle(Z, result_.raw());
-}
-
-
-void ConstantEvaluator::VisitBigintLiteral(BigintLiteral* node) {
-  const dart::String& value = H.DartString(node->value());
-  result_ = Integer::New(value, Heap::kOld);
-  result_ = H.Canonicalize(result_);
-}
-
-
-void ConstantEvaluator::VisitBoolLiteral(BoolLiteral* node) {
-  result_ = Bool::Get(node->value()).raw();
-}
-
-
-void ConstantEvaluator::VisitDoubleLiteral(DoubleLiteral* node) {
-  result_ = Double::New(H.DartString(node->value()), Heap::kOld);
-  result_ = H.Canonicalize(result_);
-}
-
-
-void ConstantEvaluator::VisitIntLiteral(IntLiteral* node) {
-  result_ = Integer::New(node->value(), Heap::kOld);
-  result_ = H.Canonicalize(result_);
-}
-
-
-void ConstantEvaluator::VisitNullLiteral(NullLiteral* node) {
-  result_ = Instance::null();
-}
-
-
-void ConstantEvaluator::VisitStringLiteral(StringLiteral* node) {
-  result_ = H.DartSymbol(node->value()).raw();
-}
-
-
-void ConstantEvaluator::VisitTypeLiteral(TypeLiteral* node) {
-  const AbstractType& type = T.TranslateType(node->type());
-  if (type.IsMalformed()) {
-    H.ReportError("Malformed type literal in constant expression.");
-  }
-  result_ = type.raw();
-}
-
-
-RawObject* ConstantEvaluator::EvaluateConstConstructorCall(
-    const dart::Class& type_class,
-    const TypeArguments& type_arguments,
-    const Function& constructor,
-    const Object& argument) {
-  // Factories have one extra argument: the type arguments.
-  // Constructors have 1 extra arguments: receiver.
-  const int kNumArgs = 1;
-  const int kNumExtraArgs = 1;
-  const int num_arguments = kNumArgs + kNumExtraArgs;
-  const Array& arg_values =
-      Array::Handle(Z, Array::New(num_arguments, Heap::kOld));
-  Instance& instance = Instance::Handle(Z);
-  if (!constructor.IsFactory()) {
-    instance = Instance::New(type_class, Heap::kOld);
-    if (!type_arguments.IsNull()) {
-      ASSERT(type_arguments.IsInstantiated());
-      instance.SetTypeArguments(
-          TypeArguments::Handle(Z, type_arguments.Canonicalize()));
-    }
-    arg_values.SetAt(0, instance);
-  } else {
-    // Prepend type_arguments to list of arguments to factory.
-    ASSERT(type_arguments.IsZoneHandle());
-    arg_values.SetAt(0, type_arguments);
-  }
-  arg_values.SetAt((0 + kNumExtraArgs), argument);
-  const Array& args_descriptor = Array::Handle(
-      Z, ArgumentsDescriptor::New(num_arguments, Object::empty_array()));
-  const Object& result = Object::Handle(
-      Z, DartEntry::InvokeFunction(constructor, arg_values, args_descriptor));
-  ASSERT(!result.IsError());
-  if (constructor.IsFactory()) {
-    // The factory method returns the allocated object.
-    instance ^= result.raw();
-  }
-  return H.Canonicalize(instance);
-}
-
-
-bool ConstantEvaluator::GetCachedConstant(TreeNode* node, Instance* value) {
-  if (builder_ == NULL) return false;
-
-  const Function& function = builder_->parsed_function_->function();
-  if (function.kind() == RawFunction::kImplicitStaticFinalGetter) {
-    // Don't cache constants in initializer expressions. They get
-    // evaluated only once.
-    return false;
-  }
-
-  bool is_present = false;
-  ASSERT(!script_.InVMHeap());
-  if (script_.compile_time_constants() == Array::null()) {
-    return false;
-  }
-  KernelConstantsMap constants(script_.compile_time_constants());
-  *value ^= constants.GetOrNull(node->kernel_offset(), &is_present);
-  // Mutator compiler thread may add constants while background compiler
-  // is running, and thus change the value of 'compile_time_constants';
-  // do not assert that 'compile_time_constants' has not changed.
-  constants.Release();
-  if (FLAG_compiler_stats && is_present) {
-    H.thread()->compiler_stats()->num_const_cache_hits++;
-  }
-  return is_present;
-}
-
-
-void ConstantEvaluator::CacheConstantValue(TreeNode* node,
-                                           const Instance& value) {
-  ASSERT(Thread::Current()->IsMutatorThread());
-
-  if (builder_ == NULL) return;
-
-  const Function& function = builder_->parsed_function_->function();
-  if (function.kind() == RawFunction::kImplicitStaticFinalGetter) {
-    // Don't cache constants in initializer expressions. They get
-    // evaluated only once.
-    return;
-  }
-  const intptr_t kInitialConstMapSize = 16;
-  ASSERT(!script_.InVMHeap());
-  if (script_.compile_time_constants() == Array::null()) {
-    const Array& array = Array::Handle(
-        HashTables::New<KernelConstantsMap>(kInitialConstMapSize, Heap::kNew));
-    script_.set_compile_time_constants(array);
-  }
-  KernelConstantsMap constants(script_.compile_time_constants());
-  constants.InsertNewOrGetValue(node->kernel_offset(), value);
-  script_.set_compile_time_constants(constants.Release());
-}
-
-
-void ConstantEvaluator::VisitSymbolLiteral(SymbolLiteral* node) {
-  const dart::String& symbol_value = H.DartSymbol(node->value());
-
-  const dart::Class& symbol_class =
-      dart::Class::ZoneHandle(Z, I->object_store()->symbol_class());
-  ASSERT(!symbol_class.IsNull());
-  const Function& symbol_constructor = Function::ZoneHandle(
-      Z, symbol_class.LookupConstructor(Symbols::SymbolCtor()));
-  ASSERT(!symbol_constructor.IsNull());
-  result_ ^= EvaluateConstConstructorCall(
-      symbol_class, TypeArguments::Handle(Z), symbol_constructor, symbol_value);
-}
-
-
-void ConstantEvaluator::VisitListLiteral(ListLiteral* node) {
-  DartType* types[] = {node->type()};
-  const TypeArguments& type_arguments = T.TranslateTypeArguments(types, 1);
-
-  intptr_t length = node->expressions().length();
-  const Array& const_list =
-      Array::ZoneHandle(Z, Array::New(length, Heap::kOld));
-  const_list.SetTypeArguments(type_arguments);
-  for (intptr_t i = 0; i < length; i++) {
-    const Instance& expression = EvaluateExpression(node->expressions()[i]);
-    const_list.SetAt(i, expression);
-  }
-  const_list.MakeImmutable();
-  result_ = H.Canonicalize(const_list);
-}
-
-
-void ConstantEvaluator::VisitMapLiteral(MapLiteral* node) {
-  DartType* types[] = {node->key_type(), node->value_type()};
-  const TypeArguments& type_arguments = T.TranslateTypeArguments(types, 2);
-
-  intptr_t length = node->entries().length();
-
-  Array& const_kv_array =
-      Array::ZoneHandle(Z, Array::New(2 * length, Heap::kOld));
-  for (intptr_t i = 0; i < length; i++) {
-    const_kv_array.SetAt(2 * i + 0,
-                         EvaluateExpression(node->entries()[i]->key()));
-    const_kv_array.SetAt(2 * i + 1,
-                         EvaluateExpression(node->entries()[i]->value()));
-  }
-
-  const_kv_array.MakeImmutable();
-  const_kv_array ^= H.Canonicalize(const_kv_array);
-
-  const dart::Class& map_class = dart::Class::Handle(
-      Z, dart::Library::LookupCoreClass(Symbols::ImmutableMap()));
-  ASSERT(!map_class.IsNull());
-  ASSERT(map_class.NumTypeArguments() == 2);
-
-  const dart::Field& field = dart::Field::Handle(
-      Z, map_class.LookupInstanceFieldAllowPrivate(H.DartSymbol("_kvPairs")));
-  ASSERT(!field.IsNull());
-
-  // NOTE: This needs to be kept in sync with `runtime/lib/immutable_map.dart`!
-  result_ = Instance::New(map_class, Heap::kOld);
-  ASSERT(!result_.IsNull());
-  result_.SetTypeArguments(type_arguments);
-  result_.SetField(field, const_kv_array);
-  result_ = H.Canonicalize(result_);
-}
-
-
-void ConstantEvaluator::VisitConstructorInvocation(
-    ConstructorInvocation* node) {
-  Arguments* kernel_arguments = node->arguments();
-
-  const Function& constructor = Function::Handle(
-      Z, H.LookupConstructorByKernelConstructor(node->target()));
-  dart::Class& klass = dart::Class::Handle(Z, constructor.Owner());
-
-  // Build the type arguments vector (if necessary).
-  const TypeArguments* type_arguments =
-      TranslateTypeArguments(constructor, &klass, kernel_arguments);
-
-  // Prepare either the instance or the type argument vector for the constructor
-  // call.
-  Instance* receiver = NULL;
-  const TypeArguments* type_arguments_argument = NULL;
-  if (!constructor.IsFactory()) {
-    receiver = &Instance::ZoneHandle(Z, Instance::New(klass, Heap::kOld));
-    if (type_arguments != NULL) {
-      receiver->SetTypeArguments(*type_arguments);
-    }
-  } else {
-    type_arguments_argument = type_arguments;
-  }
-
-  const Object& result = RunFunction(constructor, kernel_arguments, receiver,
-                                     type_arguments_argument);
-  if (constructor.IsFactory()) {
-    // Factories return the new object.
-    result_ ^= result.raw();
-    result_ = H.Canonicalize(result_);
-  } else {
-    ASSERT(!receiver->IsNull());
-    result_ = H.Canonicalize(*receiver);
-  }
-}
-
-
-void ConstantEvaluator::VisitMethodInvocation(MethodInvocation* node) {
-  Arguments* kernel_arguments = node->arguments();
-
-  // Dart does not support generic methods yet.
-  ASSERT(kernel_arguments->types().length() == 0);
-
-  const Instance& receiver = EvaluateExpression(node->receiver());
-  dart::Class& klass = dart::Class::Handle(
-      Z, isolate_->class_table()->At(receiver.GetClassId()));
-  ASSERT(!klass.IsNull());
-
-  // Search the superclass chain for the selector.
-  Function& function = Function::Handle(Z);
-  const dart::String& method_name = H.DartMethodName(node->name());
-  while (!klass.IsNull()) {
-    function = klass.LookupDynamicFunctionAllowPrivate(method_name);
-    if (!function.IsNull()) break;
-    klass = klass.SuperClass();
-  }
-
-  // The frontend should guarantee that [MethodInvocation]s inside constant
-  // expressions are always valid.
-  ASSERT(!function.IsNull());
-
-  // Run the method and canonicalize the result.
-  const Object& result = RunFunction(function, kernel_arguments, &receiver);
-  result_ ^= result.raw();
-  result_ = H.Canonicalize(result_);
-}
-
-
-void ConstantEvaluator::VisitStaticGet(StaticGet* node) {
-  NameIndex target = node->target();
-  if (H.IsField(target)) {
-    const dart::Field& field =
-        dart::Field::Handle(Z, H.LookupFieldByKernelField(target));
-    if (field.StaticValue() == Object::sentinel().raw() ||
-        field.StaticValue() == Object::transition_sentinel().raw()) {
-      field.EvaluateInitializer();
-      result_ = field.StaticValue();
-      result_ = H.Canonicalize(result_);
-      field.SetStaticValue(result_, true);
-    } else {
-      result_ = field.StaticValue();
-    }
-  } else if (H.IsProcedure(target)) {
-    const Function& function =
-        Function::ZoneHandle(Z, H.LookupStaticMethodByKernelProcedure(target));
-
-    if (H.IsMethod(target)) {
-      Function& closure_function =
-          Function::ZoneHandle(Z, function.ImplicitClosureFunction());
-      closure_function.set_kernel_function(function.kernel_function());
-      result_ = closure_function.ImplicitStaticClosure();
-      result_ = H.Canonicalize(result_);
-    } else if (H.IsGetter(target)) {
-      UNIMPLEMENTED();
-    } else {
-      UNIMPLEMENTED();
-    }
-  }
-}
-
-
-void ConstantEvaluator::VisitVariableGet(VariableGet* node) {
-  // When we see a [VariableGet] the corresponding [VariableDeclaration] must've
-  // been executed already. It therefore must have a constant object associated
-  // with it.
-  LocalVariable* variable = builder_->LookupVariable(node->variable());
-  ASSERT(variable->IsConst());
-  result_ = variable->ConstValue()->raw();
-}
-
-
-void ConstantEvaluator::VisitLet(Let* node) {
-  VariableDeclaration* variable = node->variable();
-  LocalVariable* local = builder_->LookupVariable(variable);
-  local->SetConstValue(EvaluateExpression(variable->initializer()));
-  node->body()->AcceptExpressionVisitor(this);
-}
-
-
-void ConstantEvaluator::VisitStaticInvocation(StaticInvocation* node) {
-  const Function& function = Function::ZoneHandle(
-      Z, H.LookupStaticMethodByKernelProcedure(node->procedure()));
-  dart::Class& klass = dart::Class::Handle(Z, function.Owner());
-
-  // Build the type arguments vector (if necessary).
-  const TypeArguments* type_arguments =
-      TranslateTypeArguments(function, &klass, node->arguments());
-
-  const Object& result =
-      RunFunction(function, node->arguments(), NULL, type_arguments);
-  result_ ^= result.raw();
-  result_ = H.Canonicalize(result_);
-}
-
-
-void ConstantEvaluator::VisitStringConcatenation(StringConcatenation* node) {
-  intptr_t length = node->expressions().length();
-
-  bool all_string = true;
-  const Array& strings = Array::Handle(Z, Array::New(length));
-  for (intptr_t i = 0; i < length; i++) {
-    EvaluateExpression(node->expressions()[i]);
-    strings.SetAt(i, result_);
-    all_string = all_string && result_.IsString();
-  }
-  if (all_string) {
-    result_ = dart::String::ConcatAll(strings, Heap::kOld);
-    result_ = H.Canonicalize(result_);
-  } else {
-    // Get string interpolation function.
-    const dart::Class& cls = dart::Class::Handle(
-        Z, dart::Library::LookupCoreClass(Symbols::StringBase()));
-    ASSERT(!cls.IsNull());
-    const Function& func = Function::Handle(
-        Z, cls.LookupStaticFunction(
-               dart::Library::PrivateCoreLibName(Symbols::Interpolate())));
-    ASSERT(!func.IsNull());
-
-    // Build argument array to pass to the interpolation function.
-    const Array& interpolate_arg = Array::Handle(Z, Array::New(1, Heap::kOld));
-    interpolate_arg.SetAt(0, strings);
-
-    // Run and canonicalize.
-    const Object& result =
-        RunFunction(func, interpolate_arg, Array::null_array());
-    result_ = H.Canonicalize(dart::String::Cast(result));
-  }
-}
-
-
-void ConstantEvaluator::VisitConditionalExpression(
-    ConditionalExpression* node) {
-  if (EvaluateBooleanExpression(node->condition())) {
-    EvaluateExpression(node->then());
-  } else {
-    EvaluateExpression(node->otherwise());
-  }
-}
-
-
-void ConstantEvaluator::VisitLogicalExpression(LogicalExpression* node) {
-  if (node->op() == LogicalExpression::kAnd) {
-    if (EvaluateBooleanExpression(node->left())) {
-      EvaluateBooleanExpression(node->right());
-    }
-  } else {
-    ASSERT(node->op() == LogicalExpression::kOr);
-    if (!EvaluateBooleanExpression(node->left())) {
-      EvaluateBooleanExpression(node->right());
-    }
-  }
-}
-
-
-void ConstantEvaluator::VisitNot(Not* node) {
-  result_ ^= Bool::Get(!EvaluateBooleanExpression(node->expression())).raw();
-}
-
-
-void ConstantEvaluator::VisitPropertyGet(PropertyGet* node) {
-  StringIndex string_index = node->name()->string_index();
-  if (H.StringEquals(string_index, "length")) {
-    node->receiver()->AcceptExpressionVisitor(this);
-    if (result_.IsString()) {
-      const dart::String& str =
-          dart::String::Handle(Z, dart::String::RawCast(result_.raw()));
-      result_ = Integer::New(str.Length());
-    } else {
-      H.ReportError(
-          "Constant expressions can only call "
-          "'length' on string constants.");
-    }
-  } else {
-    VisitDefaultExpression(node);
-  }
-}
-
-
-const TypeArguments* ConstantEvaluator::TranslateTypeArguments(
-    const Function& target,
-    dart::Class* target_klass,
-    Arguments* kernel_arguments) {
-  List<DartType>& kernel_type_arguments = kernel_arguments->types();
-
-  const TypeArguments* type_arguments = NULL;
-  if (kernel_type_arguments.length() > 0) {
-    type_arguments = &T.TranslateInstantiatedTypeArguments(
-        *target_klass, kernel_type_arguments.raw_array(),
-        kernel_type_arguments.length());
-
-    if (!(type_arguments->IsNull() || type_arguments->IsInstantiated())) {
-      H.ReportError("Type must be constant in const constructor.");
-    }
-  } else if (target.IsFactory() && type_arguments == NULL) {
-    // All factories take a type arguments vector as first argument (independent
-    // of whether the class is generic or not).
-    type_arguments = &TypeArguments::ZoneHandle(Z, TypeArguments::null());
-  }
-  return type_arguments;
-}
-
-
-const Object& ConstantEvaluator::RunFunction(const Function& function,
-                                             Arguments* kernel_arguments,
-                                             const Instance* receiver,
-                                             const TypeArguments* type_args) {
-  // We do not support generic methods yet.
-  ASSERT((receiver == NULL) || (type_args == NULL));
-  intptr_t extra_arguments =
-      (receiver != NULL ? 1 : 0) + (type_args != NULL ? 1 : 0);
-
-  // Build up arguments.
-  const Array& arguments = Array::ZoneHandle(
-      Z, Array::New(extra_arguments + kernel_arguments->count()));
-  const Array& names =
-      Array::ZoneHandle(Z, Array::New(kernel_arguments->named().length()));
-  intptr_t pos = 0;
-  if (receiver != NULL) {
-    arguments.SetAt(pos++, *receiver);
-  }
-  if (type_args != NULL) {
-    arguments.SetAt(pos++, *type_args);
-  }
-  for (intptr_t i = 0; i < kernel_arguments->positional().length(); i++) {
-    EvaluateExpression(kernel_arguments->positional()[i]);
-    arguments.SetAt(pos++, result_);
-  }
-  for (intptr_t i = 0; i < kernel_arguments->named().length(); i++) {
-    NamedExpression* named_expression = kernel_arguments->named()[i];
-    EvaluateExpression(named_expression->expression());
-    arguments.SetAt(pos++, result_);
-    names.SetAt(i, H.DartSymbol(named_expression->name()));
-  }
-  return RunFunction(function, arguments, names);
-}
-
-
-const Object& ConstantEvaluator::RunFunction(const Function& function,
-                                             const Array& arguments,
-                                             const Array& names) {
-  const Array& args_descriptor =
-      Array::Handle(Z, ArgumentsDescriptor::New(arguments.Length(), names));
-  const Object& result = Object::Handle(
-      Z, DartEntry::InvokeFunction(function, arguments, args_descriptor));
-  if (result.IsError()) {
-    H.ReportError(Error::Cast(result), "error evaluating constant constructor");
-  }
-  return result;
-}
-
 
 FlowGraphBuilder::FlowGraphBuilder(
-    TreeNode* node,
+    intptr_t kernel_offset,
     ParsedFunction* parsed_function,
     const ZoneGrowableArray<const ICData*>& ic_data_array,
     InlineExitCollector* exit_collector,
     intptr_t osr_id,
     intptr_t first_block_id)
     : translation_helper_(Thread::Current()),
       zone_(translation_helper_.zone()),
-      node_(node),
+      kernel_offset_(kernel_offset),
       parsed_function_(parsed_function),
       osr_id_(osr_id),
       ic_data_array_(ic_data_array),
       exit_collector_(exit_collector),
       next_block_id_(first_block_id),
       next_function_id_(0),
       context_depth_(0),
       loop_depth_(0),
       try_depth_(0),
       catch_depth_(0),
       for_in_depth_(0),
       stack_(NULL),
       pending_argument_count_(0),
       graph_entry_(NULL),
       scopes_(NULL),
       breakable_block_(NULL),
       switch_block_(NULL),
       try_finally_block_(NULL),
       try_catch_block_(NULL),
       next_used_try_index_(0),
       catch_block_(NULL),
       type_translator_(&translation_helper_,
                        &active_class_,
                        /* finalize= */ true),
-      constant_evaluator_(this, zone_, &translation_helper_, &type_translator_),
       streaming_flow_graph_builder_(NULL) {
   Script& script = Script::Handle(Z, parsed_function->function().script());
   H.SetStringOffsets(TypedData::Handle(Z, script.kernel_string_offsets()));
   H.SetStringData(TypedData::Handle(Z, script.kernel_string_data()));
   H.SetCanonicalNames(TypedData::Handle(Z, script.kernel_canonical_names()));
 }
 
 
 FlowGraphBuilder::~FlowGraphBuilder() {
   if (streaming_flow_graph_builder_ != NULL) {
@@ skipping 34 matching lines @@
       JoinEntryInstr* entry = BuildJoinEntry();
       instructions += Goto(entry);
       instructions = Fragment(instructions.entry, entry);
     }
 
     Statement* finalizer = try_finally_block_->finalizer();
     intptr_t finalizer_kernel_offset =
         try_finally_block_->finalizer_kernel_offset();
     try_finally_block_ = try_finally_block_->outer();
     if (finalizer != NULL) {
-      // This will potentially have exceptional cases as described in
-      // [VisitTryFinally] and will handle them.
-      instructions += TranslateStatement(finalizer);
+      UNREACHABLE();
     } else {
       instructions += streaming_flow_graph_builder_->BuildStatementAt(
           finalizer_kernel_offset);
     }
 
     // We only need to make sure that if the finalizer ended normally, we
     // continue towards the next outer try-finally.
     if (!instructions.is_open()) break;
   }
 
   if (instructions.is_open() && target_context_depth != -1) {
     // A target context depth of -1 indicates that the code after this
     // will not care about the context chain so we can leave it any way we
     // want after the last finalizer.  That is used when returning.
     instructions += AdjustContextTo(target_context_depth);
   }
 
   try_finally_block_ = saved_block;
   try_catch_block_ = saved_try_catch_block;
   context_depth_ = saved_depth;
   try_depth_ = saved_try_depth;
 
   return instructions;
 }
 
 
-Fragment FlowGraphBuilder::EnterScope(TreeNode* node, bool* new_context) {
-  return EnterScope(node->kernel_offset(), new_context);
-}
-
-
 Fragment FlowGraphBuilder::EnterScope(intptr_t kernel_offset,
                                       bool* new_context) {
   Fragment instructions;
   const intptr_t context_size =
       scopes_->scopes.Lookup(kernel_offset)->num_context_variables();
   if (context_size > 0) {
     instructions += PushContext(context_size);
     instructions += Drop();
     if (new_context != NULL) {
       *new_context = true;
     }
   }
   return instructions;
 }
 
 
-Fragment FlowGraphBuilder::ExitScope(TreeNode* node) {
-  return ExitScope(node->kernel_offset());
-}
-
-
 Fragment FlowGraphBuilder::ExitScope(intptr_t kernel_offset) {
   Fragment instructions;
   const intptr_t context_size =
       scopes_->scopes.Lookup(kernel_offset)->num_context_variables();
   if (context_size > 0) {
     instructions += PopContext();
   }
   return instructions;
 }
 
@@ skipping 50 matching lines @@
 #ifdef DEBUG
     Function& function =
         Function::Handle(Z, parsed_function_->function().raw());
     while (function.IsClosureFunction()) {
       function = function.parent_function();
     }
     ASSERT(function.IsFactory());
 #endif
     instructions += LoadLocal(scopes_->type_arguments_variable);
   } else if (scopes_->this_variable != NULL &&
-             active_class_.kernel_class != NULL &&
-             active_class_.kernel_class->type_parameters().length() > 0) {
+             active_class_.class_type_parameters > 0) {
     ASSERT(!parsed_function_->function().IsFactory());
     intptr_t type_arguments_field_offset =
         active_class_.klass->type_arguments_field_offset();
     ASSERT(type_arguments_field_offset != dart::Class::kNoTypeArguments);
 
     instructions += LoadLocal(scopes_->this_variable);
     instructions += LoadField(type_arguments_field_offset);
   } else {
     instructions += NullConstant();
   }
@@ skipping 902 matching lines @@
     parsed_function_->Bailout("kernel::FlowGraphBuilder", reason);
   }
 }
 
 
 FlowGraph* FlowGraphBuilder::BuildGraph() {
   const Function& function = parsed_function_->function();
 
   if (function.IsConstructorClosureFunction()) return NULL;
 
-  TreeNode* library_node = node_;
-  if (node_ != NULL) {
-    const Function* parent = &function;
-    while (true) {
-      library_node = static_cast<kernel::TreeNode*>(parent->kernel_function());
-      while (library_node != NULL && !library_node->IsLibrary()) {
-        if (library_node->IsMember()) {
-          library_node = Member::Cast(library_node)->parent();
-        } else if (library_node->IsClass()) {
-          library_node = Class::Cast(library_node)->parent();
-          break;
-        } else {
-          library_node = NULL;
-          break;
-        }
-      }
-      if (library_node != NULL) break;
-      parent = &Function::Handle(parent->parent_function());
-    }
-  }
   if (streaming_flow_graph_builder_ != NULL) {
     delete streaming_flow_graph_builder_;
     streaming_flow_graph_builder_ = NULL;
   }
-  if (library_node != NULL && library_node->IsLibrary()) {
-    Library* library = Library::Cast(library_node);
-    streaming_flow_graph_builder_ = new StreamingFlowGraphBuilder(
-        this, library->kernel_data(), library->kernel_data_size());
-  }
 
-  dart::Class& klass =
-      dart::Class::Handle(zone_, parsed_function_->function().Owner());
+  Script& script = Script::Handle(Z, function.script());
+  streaming_flow_graph_builder_ = new StreamingFlowGraphBuilder(
+      this, script.kernel_data(), script.kernel_data_size());
 
-  Function& outermost_function = Function::Handle(Z);
-  TreeNode* outermost_node = NULL;
-  Class* kernel_class = NULL;
-  DiscoverEnclosingElements(Z, function, &outermost_function, &outermost_node,
-                            &kernel_class);
-
-  // Mark that we are using [klass]/[kernell_klass] as active class.  Resolving
-  // of type parameters will get resolved via [kernell_klass] unless we are
-  // nested inside a static factory in which case we will use [member].
-  ActiveClassScope active_class_scope(&active_class_, kernel_class, &klass);
-  Member* member = ((outermost_node != NULL) && outermost_node->IsMember())
-                       ? Member::Cast(outermost_node)
-                       : NULL;
-  ActiveMemberScope active_member(&active_class_, member);
-
-  // The IR builder will create its own local variables and scopes, and it
-  // will not need an AST.  The code generator will assume that there is a
-  // local variable stack slot allocated for the current context and (I
-  // think) that the runtime will expect it to be at a fixed offset which
-  // requires allocating an unused expression temporary variable.
-  scopes_ = parsed_function_->EnsureKernelScopes();
-
-  switch (function.kind()) {
-    case RawFunction::kClosureFunction:
-    case RawFunction::kRegularFunction:
-    case RawFunction::kGetterFunction:
-    case RawFunction::kSetterFunction: {
-      FunctionNode* kernel_function = node_->IsProcedure()
-                                          ? Procedure::Cast(node_)->function()
-                                          : FunctionNode::Cast(node_);
-      return function.IsImplicitClosureFunction()
-                 ? BuildGraphOfImplicitClosureFunction(kernel_function,
-                                                       function)
-                 : BuildGraphOfFunction(kernel_function);
-    }
-    case RawFunction::kConstructor: {
-      bool is_factory = function.IsFactory();
-      if (is_factory) {
-        Procedure* procedure = Procedure::Cast(node_);
-        FunctionNode* function = procedure->function();
-        return BuildGraphOfFunction(function, NULL);
-      } else {
-        Constructor* constructor = Constructor::Cast(node_);
-        FunctionNode* function = constructor->function();
-        return BuildGraphOfFunction(function, constructor);
-      }
-    }
-    case RawFunction::kImplicitGetter:
-    case RawFunction::kImplicitStaticFinalGetter:
-    case RawFunction::kImplicitSetter: {
-      Field* field = Field::Cast(node_);
-      return IsStaticInitializer(function, Z)
-                 ? BuildGraphOfStaticFieldInitializer(field)
-                 : BuildGraphOfFieldAccessor(field, scopes_->setter_value);
-    }
-    case RawFunction::kMethodExtractor:
-      return BuildGraphOfMethodExtractor(function);
-    case RawFunction::kNoSuchMethodDispatcher:
-      return BuildGraphOfNoSuchMethodDispatcher(function);
-    case RawFunction::kInvokeFieldDispatcher:
-      return BuildGraphOfInvokeFieldDispatcher(function);
-    case RawFunction::kSignatureFunction:
-    case RawFunction::kIrregexpFunction:
-      break;
-  }
-  UNREACHABLE();
-  return NULL;
+  return streaming_flow_graph_builder_->BuildGraph(kernel_offset_);
 }
 
 
-FlowGraph* FlowGraphBuilder::BuildGraphOfFunction(FunctionNode* function,
-                                                  Constructor* constructor) {
-  const Function& dart_function = parsed_function_->function();
-  TargetEntryInstr* normal_entry = BuildTargetEntry();
-  graph_entry_ =
-      new (Z) GraphEntryInstr(*parsed_function_, normal_entry, osr_id_);
-
-  SetupDefaultParameterValues(function);
-
-  Fragment body;
-  if (!dart_function.is_native()) body += CheckStackOverflowInPrologue();
-  intptr_t context_size =
-      parsed_function_->node_sequence()->scope()->num_context_variables();
-  if (context_size > 0) {
-    body += PushContext(context_size);
-    LocalVariable* context = MakeTemporary();
-
-    // Copy captured parameters from the stack into the context.
-    LocalScope* scope = parsed_function_->node_sequence()->scope();
-    intptr_t parameter_count = dart_function.NumParameters();
-    intptr_t parameter_index = parsed_function_->first_parameter_index();
-    for (intptr_t i = 0; i < parameter_count; ++i, --parameter_index) {
-      LocalVariable* variable = scope->VariableAt(i);
-      if (variable->is_captured()) {
-        // There is no LocalVariable describing the on-stack parameter so
-        // create one directly and use the same type.
-        LocalVariable* parameter = new (Z)
-            LocalVariable(TokenPosition::kNoSource, TokenPosition::kNoSource,
-                          Symbols::TempParam(), variable->type());
-        parameter->set_index(parameter_index);
-        // Mark the stack variable so it will be ignored by the code for
-        // try/catch.
-        parameter->set_is_captured_parameter(true);
-
-        // Copy the parameter from the stack to the context.  Overwrite it
-        // with a null constant on the stack so the original value is
-        // eligible for garbage collection.
-        body += LoadLocal(context);
-        body += LoadLocal(parameter);
-        body += StoreInstanceField(TokenPosition::kNoSource,
-                                   Context::variable_offset(variable->index()));
-        body += NullConstant();
-        body += StoreLocal(TokenPosition::kNoSource, parameter);
-        body += Drop();
-      }
-    }
-    body += Drop();  // The context.
-  }
-  if (constructor != NULL) {
-    // TODO(27590): Currently the [VariableDeclaration]s from the
-    // initializers will be visible inside the entire body of the constructor.
-    // We should make a separate scope for them.
-    Class* kernel_class = Class::Cast(constructor->parent());
-    body += TranslateInitializers(kernel_class, &constructor->initializers());
-  }
-
-  // The specification defines the result of `a == b` to be:
-  //
-  //   a) if either side is `null` then the result is `identical(a, b)`.
-  //   b) else the result is `a.operator==(b)`
-  //
-  // For user-defined implementations of `operator==` we need therefore
-  // implement the handling of a).
-  //
-  // The default `operator==` implementation in `Object` is implemented in terms
-  // of identical (which we assume here!) which means that case a) is actually
-  // included in b).  So we just use the normal implementation in the body.
-  if ((dart_function.NumParameters() == 2) &&
-      (dart_function.name() == Symbols::EqualOperator().raw()) &&
-      (dart_function.Owner() != I->object_store()->object_class())) {
-    LocalVariable* parameter =
-        LookupVariable(function->positional_parameters()[0]);
-
-    TargetEntryInstr* null_entry;
-    TargetEntryInstr* non_null_entry;
-
-    body += LoadLocal(parameter);
-    body += BranchIfNull(&null_entry, &non_null_entry);
-
-    // The argument was `null` and the receiver is not the null class (we only
-    // go into this branch for user-defined == operators) so we can return
-    // false.
-    Fragment null_fragment(null_entry);
-    null_fragment += Constant(Bool::False());
-    null_fragment += Return(dart_function.end_token_pos());
-
-    body = Fragment(body.entry, non_null_entry);
-  }
-
-  // If we run in checked mode, we have to check the type of the passed
-  // arguments.
-  if (I->type_checks()) {
-    List<VariableDeclaration>& positional = function->positional_parameters();
-    List<VariableDeclaration>& named = function->named_parameters();
-
-    for (intptr_t i = 0; i < positional.length(); i++) {
-      VariableDeclaration* variable = positional[i];
-      body += LoadLocal(LookupVariable(variable));
-      body += CheckVariableTypeInCheckedMode(variable);
-      body += Drop();
-    }
-    for (intptr_t i = 0; i < named.length(); i++) {
-      VariableDeclaration* variable = named[i];
-      body += LoadLocal(LookupVariable(variable));
-      body += CheckVariableTypeInCheckedMode(variable);
-      body += Drop();
-    }
-  }
-
-  if (FLAG_causal_async_stacks &&
-      (dart_function.IsAsyncFunction() || dart_function.IsAsyncGenerator())) {
-    LocalScope* scope = parsed_function_->node_sequence()->scope();
-    // :async_stack_trace = _asyncStackTraceHelper(:async_op);
-    const dart::Library& async_lib =
-        dart::Library::Handle(dart::Library::AsyncLibrary());
-    const Function& target = Function::ZoneHandle(
-        Z,
-        async_lib.LookupFunctionAllowPrivate(Symbols::AsyncStackTraceHelper()));
-    ASSERT(!target.IsNull());
-
-    // TODO(johnmccutchan): Why does this have the null value?
-    LocalVariable* async_op =
-        scope->child()->LookupVariable(Symbols::AsyncOperation(), false);
-    ASSERT(async_op != NULL);
-    ASSERT(async_op->is_captured());
-    body += LoadLocal(async_op);
-    body += PushArgument();
-    body += StaticCall(TokenPosition::kNoSource, target, 1);
-    LocalVariable* async_stack_trace_var =
-        scope->LookupVariable(Symbols::AsyncStackTraceVar(), false);
-    ASSERT(async_stack_trace_var != NULL);
-    body += StoreLocal(TokenPosition::kNoSource, async_stack_trace_var);
-    body += Drop();
-  }
-
-  if (dart_function.is_native()) {
-    body += NativeFunctionBody(function, dart_function);
-  } else if (function->body() != NULL) {
-    body += TranslateStatement(function->body());
-  }
-  if (body.is_open()) {
-    body += NullConstant();
-    body += Return(dart_function.end_token_pos());
-  }
-
-  // If functions body contains any yield points build switch statement that
-  // selects a continuation point based on the value of :await_jump_var.
-  if (!yield_continuations_.is_empty()) {
-    // The code we are building will be executed right after we enter
-    // the function and before any nested contexts are allocated.
-    // Reset current context_depth_ to match this.
-    const intptr_t current_context_depth = context_depth_;
-    context_depth_ = scopes_->yield_jump_variable->owner()->context_level();
-
-    // Prepend an entry corresponding to normal entry to the function.
-    yield_continuations_.InsertAt(
-        0, YieldContinuation(new (Z) DropTempsInstr(0, NULL),
-                             CatchClauseNode::kInvalidTryIndex));
-    yield_continuations_[0].entry->LinkTo(body.entry);
-
-    // Build a switch statement.
-    Fragment dispatch;
-
-    // Load :await_jump_var into a temporary.
-    dispatch += LoadLocal(scopes_->yield_jump_variable);
-    dispatch += StoreLocal(TokenPosition::kNoSource, scopes_->switch_variable);
-    dispatch += Drop();
-
-    BlockEntryInstr* block = NULL;
-    for (intptr_t i = 0; i < yield_continuations_.length(); i++) {
-      if (i == 1) {
-        // This is not a normal entry but a resumption.  Restore
-        // :current_context_var from :await_ctx_var.
-        // Note: after this point context_depth_ does not match current context
-        // depth so we should not access any local variables anymore.
-        dispatch += LoadLocal(scopes_->yield_context_variable);
-        dispatch += StoreLocal(TokenPosition::kNoSource,
-                               parsed_function_->current_context_var());
-        dispatch += Drop();
-      }
-      if (i == (yield_continuations_.length() - 1)) {
-        // We reached the last possility, no need to build more ifs.
-        // Continue to the last continuation.
-        // Note: continuations start with nop DropTemps instruction
-        // which acts like an anchor, so we need to skip it.
-        block->set_try_index(yield_continuations_[i].try_index);
-        dispatch <<= yield_continuations_[i].entry->next();
-        break;
-      }
-
-      // Build comparison:
-      //
-      //   if (:await_ctx_var == i) {
-      //     -> yield_continuations_[i]
-      //   } else ...
-      //
-      TargetEntryInstr* then;
-      TargetEntryInstr* otherwise;
-      dispatch += LoadLocal(scopes_->switch_variable);
-      dispatch += IntConstant(i);
-      dispatch += BranchIfStrictEqual(&then, &otherwise);
-
-      // True branch is linked to appropriate continuation point.
-      // Note: continuations start with nop DropTemps instruction
-      // which acts like an anchor, so we need to skip it.
-      then->LinkTo(yield_continuations_[i].entry->next());
-      then->set_try_index(yield_continuations_[i].try_index);
-      // False branch will contain the next comparison.
-      dispatch = Fragment(dispatch.entry, otherwise);
-      block = otherwise;
-    }
-    body = dispatch;
-
-    context_depth_ = current_context_depth;
-  }
-
-  if (FLAG_causal_async_stacks &&
-      (dart_function.IsAsyncClosure() || dart_function.IsAsyncGenClosure())) {
-    // The code we are building will be executed right after we enter
-    // the function and before any nested contexts are allocated.
-    // Reset current context_depth_ to match this.
-    const intptr_t current_context_depth = context_depth_;
-    context_depth_ = scopes_->yield_jump_variable->owner()->context_level();
-
-    Fragment instructions;
-    LocalScope* scope = parsed_function_->node_sequence()->scope();
-
-    const Function& target = Function::ZoneHandle(
-        Z, I->object_store()->async_set_thread_stack_trace());
-    ASSERT(!target.IsNull());
-
-    // Fetch and load :async_stack_trace
-    LocalVariable* async_stack_trace_var =
-        scope->LookupVariable(Symbols::AsyncStackTraceVar(), false);
-    ASSERT((async_stack_trace_var != NULL) &&
-           async_stack_trace_var->is_captured());
-    instructions += LoadLocal(async_stack_trace_var);
-    instructions += PushArgument();
-
-    // Call _asyncSetThreadStackTrace
-    instructions += StaticCall(TokenPosition::kNoSource, target, 1);
-    instructions += Drop();
-
-    body = instructions + body;
-    context_depth_ = current_context_depth;
-  }
-
-  if (NeedsDebugStepCheck(dart_function, function->position())) {
-    // If a switch was added above: Start the switch by injecting a debuggable
-    // safepoint so stepping over an await works.
-    // If not, still start the body with a debuggable safepoint to ensure
-    // breaking on a method always happens, even if there are no
-    // assignments/calls/runtimecalls in the first basic block.
-    // Place this check at the last parameter to ensure parameters
-    // are in scope in the debugger at method entry.
-    const int num_params = dart_function.NumParameters();
-    TokenPosition check_pos = TokenPosition::kNoSource;
-    if (num_params > 0) {
-      LocalScope* scope = parsed_function_->node_sequence()->scope();
-      const LocalVariable& parameter = *scope->VariableAt(num_params - 1);
-      check_pos = parameter.token_pos();
-    }
-    if (!check_pos.IsDebugPause()) {
-      // No parameters or synthetic parameters.
-      check_pos = function->position();
-      ASSERT(check_pos.IsDebugPause());
-    }
-    body = DebugStepCheck(check_pos) + body;
-  }
-
-  normal_entry->LinkTo(body.entry);
-
-  // When compiling for OSR, use a depth first search to prune instructions
-  // unreachable from the OSR entry. Catch entries are always considered
-  // reachable, even if they become unreachable after OSR.
-  if (osr_id_ != Compiler::kNoOSRDeoptId) {
-    BitVector* block_marks = new (Z) BitVector(Z, next_block_id_);
-    bool found = graph_entry_->PruneUnreachable(graph_entry_, NULL, osr_id_,
-                                                block_marks);
-    ASSERT(found);
-  }
-  return new (Z) FlowGraph(*parsed_function_, graph_entry_, next_block_id_ - 1);
-}
-
-
-Fragment FlowGraphBuilder::NativeFunctionBody(FunctionNode* kernel_function,
+Fragment FlowGraphBuilder::NativeFunctionBody(intptr_t first_positional_offset,
                                               const Function& function) {
   ASSERT(function.is_native());
   // We explicitly build the graph for native functions in the same way that the
   // from-source backend does.  We should find a way to have a single component
   // to build these graphs so that this code is not duplicated.
 
   Fragment body;
   MethodRecognizer::Kind kind = MethodRecognizer::RecognizeKind(function);
   switch (kind) {
     case MethodRecognizer::kObjectEquals:
       body += LoadLocal(scopes_->this_variable);
-      body += LoadLocal(
-          LookupVariable(kernel_function->positional_parameters()[0]));
+      body += LoadLocal(LookupVariable(first_positional_offset));
       body += StrictCompare(Token::kEQ_STRICT);
       break;
     case MethodRecognizer::kStringBaseLength:
     case MethodRecognizer::kStringBaseIsEmpty:
       // Depending on FLAG_support_externalizable_strings, treat string length
       // loads as mutable so that the class check that precedes them will not be
       // hoisted.  This is unsafe because string externalization can change the
       // class.
       body += LoadLocal(scopes_->this_variable);
       body += LoadNativeField(MethodRecognizer::kStringBaseLength,
@@ skipping 17 matching lines @@
           LoadNativeField(kind, Array::length_offset(),
                           Type::ZoneHandle(Z, Type::SmiType()), kSmiCid, true);
       break;
     case MethodRecognizer::kTypedDataLength:
       body += LoadLocal(scopes_->this_variable);
       body +=
           LoadNativeField(kind, TypedData::length_offset(),
                           Type::ZoneHandle(Z, Type::SmiType()), kSmiCid, true);
       break;
     case MethodRecognizer::kClassIDgetID:
-      body += LoadLocal(
-          LookupVariable(kernel_function->positional_parameters()[0]));
+      body += LoadLocal(LookupVariable(first_positional_offset));
       body += LoadClassId();
       break;
     case MethodRecognizer::kGrowableArrayCapacity:
       body += LoadLocal(scopes_->this_variable);
       body += LoadField(Array::data_offset(), kArrayCid);
       body += LoadNativeField(MethodRecognizer::kObjectArrayLength,
                               Array::length_offset(),
                               Type::ZoneHandle(Z, Type::SmiType()), kSmiCid);
       break;
     case MethodRecognizer::kObjectArrayAllocate:
       body += LoadLocal(scopes_->type_arguments_variable);
-      body += LoadLocal(
-          LookupVariable(kernel_function->positional_parameters()[0]));
+      body += LoadLocal(LookupVariable(first_positional_offset));
       body += CreateArray();
       break;
     case MethodRecognizer::kBigint_getDigits:
       body += LoadLocal(scopes_->this_variable);
       body += LoadNativeField(kind, Bigint::digits_offset(),
                               Object::dynamic_type(), kTypedDataUint32ArrayCid);
       break;
     case MethodRecognizer::kBigint_getUsed:
       body += LoadLocal(scopes_->this_variable);
       body += LoadNativeField(kind, Bigint::used_offset(),
                               Type::ZoneHandle(Z, Type::SmiType()), kSmiCid);
       break;
     case MethodRecognizer::kLinkedHashMap_getIndex:
       body += LoadLocal(scopes_->this_variable);
       body += LoadNativeField(kind, LinkedHashMap::index_offset(),
                               Object::dynamic_type(), kDynamicCid);
       break;
     case MethodRecognizer::kLinkedHashMap_setIndex:
       body += LoadLocal(scopes_->this_variable);
-      body += LoadLocal(
-          LookupVariable(kernel_function->positional_parameters()[0]));
+      body += LoadLocal(LookupVariable(first_positional_offset));
       body += StoreInstanceField(TokenPosition::kNoSource,
                                  LinkedHashMap::index_offset());
       body += NullConstant();
       break;
     case MethodRecognizer::kLinkedHashMap_getData:
       body += LoadLocal(scopes_->this_variable);
       body += LoadNativeField(kind, LinkedHashMap::data_offset(),
                               Object::dynamic_type(), kArrayCid);
       break;
     case MethodRecognizer::kLinkedHashMap_setData:
       body += LoadLocal(scopes_->this_variable);
-      body += LoadLocal(
-          LookupVariable(kernel_function->positional_parameters()[0]));
+      body += LoadLocal(LookupVariable(first_positional_offset));
       body += StoreInstanceField(TokenPosition::kNoSource,
                                  LinkedHashMap::data_offset());
       body += NullConstant();
       break;
     case MethodRecognizer::kLinkedHashMap_getHashMask:
       body += LoadLocal(scopes_->this_variable);
       body += LoadNativeField(kind, LinkedHashMap::hash_mask_offset(),
                               Type::ZoneHandle(Z, Type::SmiType()), kSmiCid);
       break;
     case MethodRecognizer::kLinkedHashMap_setHashMask:
       body += LoadLocal(scopes_->this_variable);
-      body += LoadLocal(
-          LookupVariable(kernel_function->positional_parameters()[0]));
+      body += LoadLocal(LookupVariable(first_positional_offset));
       body += StoreInstanceField(TokenPosition::kNoSource,
                                  LinkedHashMap::hash_mask_offset(),
                                  kNoStoreBarrier);
       body += NullConstant();
       break;
     case MethodRecognizer::kLinkedHashMap_getUsedData:
       body += LoadLocal(scopes_->this_variable);
       body += LoadNativeField(kind, LinkedHashMap::used_data_offset(),
                               Type::ZoneHandle(Z, Type::SmiType()), kSmiCid);
       break;
     case MethodRecognizer::kLinkedHashMap_setUsedData:
       body += LoadLocal(scopes_->this_variable);
-      body += LoadLocal(
-          LookupVariable(kernel_function->positional_parameters()[0]));
+      body += LoadLocal(LookupVariable(first_positional_offset));
       body += StoreInstanceField(TokenPosition::kNoSource,
                                  LinkedHashMap::used_data_offset(),
                                  kNoStoreBarrier);
       body += NullConstant();
       break;
     case MethodRecognizer::kLinkedHashMap_getDeletedKeys:
       body += LoadLocal(scopes_->this_variable);
       body += LoadNativeField(kind, LinkedHashMap::deleted_keys_offset(),
                               Type::ZoneHandle(Z, Type::SmiType()), kSmiCid);
       break;
     case MethodRecognizer::kLinkedHashMap_setDeletedKeys:
       body += LoadLocal(scopes_->this_variable);
-      body += LoadLocal(
-          LookupVariable(kernel_function->positional_parameters()[0]));
+      body += LoadLocal(LookupVariable(first_positional_offset));
       body += StoreInstanceField(TokenPosition::kNoSource,
                                  LinkedHashMap::deleted_keys_offset(),
                                  kNoStoreBarrier);
       body += NullConstant();
       break;
     case MethodRecognizer::kBigint_getNeg:
       body += LoadLocal(scopes_->this_variable);
       body += LoadNativeField(kind, Bigint::neg_offset(),
                               Type::ZoneHandle(Z, Type::BoolType()), kBoolCid);
       break;
     default: {
       dart::String& name = dart::String::ZoneHandle(Z, function.native_name());
       body += NativeCall(&name, &function);
       break;
     }
   }
   return body + Return(TokenPosition::kNoSource);
 }
 
 
-FlowGraph* FlowGraphBuilder::BuildGraphOfFieldAccessor(
-    Field* kernel_field,
-    LocalVariable* setter_value) {
-  const Function& function = parsed_function_->function();
-
-  bool is_setter = function.IsImplicitSetterFunction();
-  bool is_method = !function.IsStaticFunction();
-  dart::Field& field = dart::Field::ZoneHandle(
-      Z, H.LookupFieldByKernelField(kernel_field->canonical_name()));
-
-  TargetEntryInstr* normal_entry = BuildTargetEntry();
-  graph_entry_ = new (Z)
-      GraphEntryInstr(*parsed_function_, normal_entry, Compiler::kNoOSRDeoptId);
-
-  Fragment body(normal_entry);
-  if (is_setter) {
-    if (is_method) {
-      body += LoadLocal(scopes_->this_variable);
-      body += LoadLocal(setter_value);
-      body += StoreInstanceFieldGuarded(field, false);
-    } else {
-      body += LoadLocal(setter_value);
-      body += StoreStaticField(TokenPosition::kNoSource, field);
-    }
-    body += NullConstant();
-  } else if (is_method) {
-    body += LoadLocal(scopes_->this_variable);
-    body += LoadField(field);
-  } else if (field.is_const()) {
-    // If the parser needs to know the value of an uninitialized constant field
-    // it will set the value to the transition sentinel (used to detect circular
-    // initialization) and then call the implicit getter.  Thus, the getter
-    // cannot contain the InitStaticField instruction that normal static getters
-    // contain because it would detect spurious circular initialization when it
-    // checks for the transition sentinel.
-    Expression* initializer = kernel_field->initializer();
-    ASSERT(initializer != NULL);
-    body += Constant(constant_evaluator_.EvaluateExpression(initializer));
-  } else {
-    // The field always has an initializer because static fields without
-    // initializers are initialized eagerly and do not have implicit getters.
-    ASSERT(field.has_initializer());
-    body += Constant(field);
-    body += InitStaticField(field);
-    body += Constant(field);
-    body += LoadStaticField();
-  }
-  body += Return(TokenPosition::kNoSource);
-
-  return new (Z) FlowGraph(*parsed_function_, graph_entry_, next_block_id_ - 1);
-}
-
-
-FlowGraph* FlowGraphBuilder::BuildGraphOfStaticFieldInitializer(
-    Field* kernel_field) {
-  ASSERT(kernel_field->IsStatic());
-
-  Expression* initializer = kernel_field->initializer();
-
-  TargetEntryInstr* normal_entry = BuildTargetEntry();
-  graph_entry_ = new (Z)
-      GraphEntryInstr(*parsed_function_, normal_entry, Compiler::kNoOSRDeoptId);
-
-  Fragment body(normal_entry);
-  body += CheckStackOverflowInPrologue();
-  if (kernel_field->IsConst()) {
-    body += Constant(constant_evaluator_.EvaluateExpression(initializer));
-  } else {
-    body += TranslateExpression(initializer);
-  }
-  body += Return(TokenPosition::kNoSource);
-
-  return new (Z) FlowGraph(*parsed_function_, graph_entry_, next_block_id_ - 1);
-}
-
-
 Fragment FlowGraphBuilder::BuildImplicitClosureCreation(
     const Function& target) {
   Fragment fragment;
   const dart::Class& closure_class =
       dart::Class::ZoneHandle(Z, I->object_store()->closure_class());
   fragment += AllocateObject(closure_class, target);
   LocalVariable* closure = MakeTemporary();
 
   // Allocate a context that closes over `this`.
   fragment += AllocateContext(1);
@@ skipping 27 matching lines @@
 }
 
 
 Fragment FlowGraphBuilder::GuardFieldClass(const dart::Field& field,
                                            intptr_t deopt_id) {
   return Fragment(new (Z) GuardFieldClassInstr(Pop(), field, deopt_id));
 }
 
 
 Fragment FlowGraphBuilder::CheckVariableTypeInCheckedMode(
-    VariableDeclaration* variable) {
-  if (I->type_checks()) {
-    const AbstractType& dst_type = T.TranslateType(variable->type());
-    if (dst_type.IsMalformed()) {
-      return ThrowTypeError();
-    }
-    return CheckAssignableInCheckedMode(dst_type,
-                                        H.DartSymbol(variable->name()));
-  }
-  return Fragment();
-}
-
-Fragment FlowGraphBuilder::CheckVariableTypeInCheckedMode(
     const AbstractType& dst_type,
     const dart::String& name_symbol) {
   if (I->type_checks()) {
     if (dst_type.IsMalformed()) {
       return ThrowTypeError();
     }
     return CheckAssignableInCheckedMode(dst_type, name_symbol);
   }
   return Fragment();
 }
@@ skipping 123 matching lines @@
       GraphEntryInstr(*parsed_function_, normal_entry, Compiler::kNoOSRDeoptId);
   Fragment body(normal_entry);
   body += CheckStackOverflowInPrologue();
   body += BuildImplicitClosureCreation(function);
   body += Return(TokenPosition::kNoSource);
 
   return new (Z) FlowGraph(*parsed_function_, graph_entry_, next_block_id_ - 1);
 }
 
 
-FlowGraph* FlowGraphBuilder::BuildGraphOfImplicitClosureFunction(
-    FunctionNode* kernel_function,
-    const Function& function) {
-  const Function& target = Function::ZoneHandle(Z, function.parent_function());
-
-  TargetEntryInstr* normal_entry = BuildTargetEntry();
-  graph_entry_ = new (Z)
-      GraphEntryInstr(*parsed_function_, normal_entry, Compiler::kNoOSRDeoptId);
-  SetupDefaultParameterValues(kernel_function);
-
-  Fragment body(normal_entry);
-  body += CheckStackOverflowInPrologue();
-
-  // Load all the arguments.
-  if (!target.is_static()) {
-    // The context has a fixed shape: a single variable which is the
-    // closed-over receiver.
-    body += LoadLocal(parsed_function_->current_context_var());
-    body += LoadField(Context::variable_offset(0));
-    body += PushArgument();
-  }
-  intptr_t positional_argument_count =
-      kernel_function->positional_parameters().length();
-  for (intptr_t i = 0; i < positional_argument_count; i++) {
-    body +=
-        LoadLocal(LookupVariable(kernel_function->positional_parameters()[i]));
-    body += PushArgument();
-  }
-  intptr_t named_argument_count = kernel_function->named_parameters().length();
-  Array& argument_names = Array::ZoneHandle(Z);
-  if (named_argument_count > 0) {
-    argument_names = Array::New(named_argument_count);
-    for (intptr_t i = 0; i < named_argument_count; i++) {
-      VariableDeclaration* variable = kernel_function->named_parameters()[i];
-      body += LoadLocal(LookupVariable(variable));
-      body += PushArgument();
-      argument_names.SetAt(i, H.DartSymbol(variable->name()));
-    }
-  }
-  // Forward them to the target.
-  intptr_t argument_count = positional_argument_count + named_argument_count;
-  if (!target.is_static()) ++argument_count;
-  body += StaticCall(TokenPosition::kNoSource, target, argument_count,
-                     argument_names);
-
-  // Return the result.
-  body += Return(kernel_function->end_position());
-
-  return new (Z) FlowGraph(*parsed_function_, graph_entry_, next_block_id_ - 1);
-}
-
-
 FlowGraph* FlowGraphBuilder::BuildGraphOfNoSuchMethodDispatcher(
     const Function& function) {
   // This function is specialized for a receiver class, a method name, and
   // the arguments descriptor at a call site.
 
   TargetEntryInstr* normal_entry = BuildTargetEntry();
   graph_entry_ = new (Z)
       GraphEntryInstr(*parsed_function_, normal_entry, Compiler::kNoOSRDeoptId);
 
   // The backend will expect an array of default values for all the named
@@ skipping 168 matching lines @@
     body += InstanceCall(TokenPosition::kMinSource, Symbols::Call(),
                          Token::kILLEGAL, descriptor.Count(), argument_names);
   }
 
   body += Return(TokenPosition::kNoSource);
 
   return new (Z) FlowGraph(*parsed_function_, graph_entry_, next_block_id_ - 1);
 }
 
 
-void FlowGraphBuilder::SetupDefaultParameterValues(FunctionNode* function) {
-  intptr_t num_optional_parameters =
-      parsed_function_->function().NumOptionalParameters();
-  if (num_optional_parameters > 0) {
-    ZoneGrowableArray<const Instance*>* default_values =
-        new ZoneGrowableArray<const Instance*>(Z, num_optional_parameters);
-
-    if (parsed_function_->function().HasOptionalNamedParameters()) {
-      ASSERT(!parsed_function_->function().HasOptionalPositionalParameters());
-      for (intptr_t i = 0; i < num_optional_parameters; i++) {
-        VariableDeclaration* variable = function->named_parameters()[i];
-        Instance* default_value;
-        if (variable->initializer() != NULL) {
-          default_value =
-              &constant_evaluator_.EvaluateExpression(variable->initializer());
-        } else {
-          default_value = &Instance::ZoneHandle(Z, Instance::null());
-        }
-        default_values->Add(default_value);
-      }
-    } else {
-      ASSERT(parsed_function_->function().HasOptionalPositionalParameters());
-      intptr_t required = function->required_parameter_count();
-      for (intptr_t i = 0; i < num_optional_parameters; i++) {
-        VariableDeclaration* variable =
-            function->positional_parameters()[required + i];
-        Instance* default_value;
-        if (variable->initializer() != NULL) {
-          default_value =
-              &constant_evaluator_.EvaluateExpression(variable->initializer());
-        } else {
-          default_value = &Instance::ZoneHandle(Z, Instance::null());
-        }
-        default_values->Add(default_value);
-      }
-    }
-    parsed_function_->set_default_parameter_values(default_values);
-  }
-}
-
-
 TargetEntryInstr* FlowGraphBuilder::BuildTargetEntry() {
   return new (Z) TargetEntryInstr(AllocateBlockId(), CurrentTryIndex());
 }
 
 
 JoinEntryInstr* FlowGraphBuilder::BuildJoinEntry(intptr_t try_index) {
   return new (Z) JoinEntryInstr(AllocateBlockId(), try_index);
 }
 
 
 JoinEntryInstr* FlowGraphBuilder::BuildJoinEntry() {
   return new (Z) JoinEntryInstr(AllocateBlockId(), CurrentTryIndex());
 }
 
-
-Fragment FlowGraphBuilder::TranslateFieldInitializer(NameIndex canonical_name,
-                                                     Expression* init) {
-  dart::Field& field =
-      dart::Field::ZoneHandle(Z, H.LookupFieldByKernelField(canonical_name));
-  if (init->IsNullLiteral()) {
-    field.RecordStore(Object::null_object());
-    return Fragment();
-  }
-  Fragment instructions;
-  instructions += LoadLocal(scopes_->this_variable);
-  instructions += TranslateExpression(init);
-  instructions += StoreInstanceFieldGuarded(field, true);
-  return instructions;
-}
-
-
-Fragment FlowGraphBuilder::TranslateInitializers(
-    Class* kernel_class,
-    List<Initializer>* initializers) {
-  Fragment instructions;
-
-  // These come from:
-  //   class A {
-  //     var x = (expr);
-  //   }
-  for (intptr_t i = 0; i < kernel_class->fields().length(); i++) {
-    Field* kernel_field = kernel_class->fields()[i];
-    Expression* init = kernel_field->initializer();
-    if (!kernel_field->IsStatic() && init != NULL) {
-      EnterScope(kernel_field);
-      instructions +=
-          TranslateFieldInitializer(kernel_field->canonical_name(), init);
-      ExitScope(kernel_field);
-    }
-  }
-
-  // These to come from:
-  //   class A {
-  //     var x;
-  //     var y;
-  //     A(this.x) : super(expr), y = (expr);
-  //   }
-  for (intptr_t i = 0; i < initializers->length(); i++) {
-    Initializer* initializer = (*initializers)[i];
-    if (initializer->IsFieldInitializer()) {
-      FieldInitializer* init = FieldInitializer::Cast(initializer);
-      instructions += TranslateFieldInitializer(init->field(), init->value());
-    } else if (initializer->IsSuperInitializer()) {
-      SuperInitializer* init = SuperInitializer::Cast(initializer);
-
-      instructions += LoadLocal(scopes_->this_variable);
-      instructions += PushArgument();
-
-      ASSERT(init->arguments()->types().length() == 0);
-      Array& argument_names = Array::ZoneHandle(Z);
-      instructions += TranslateArguments(init->arguments(), &argument_names);
-
-      const Function& target = Function::ZoneHandle(
-          Z, H.LookupConstructorByKernelConstructor(init->target()));
-      intptr_t argument_count = init->arguments()->count() + 1;
-      instructions += StaticCall(TokenPosition::kNoSource, target,
-                                 argument_count, argument_names);
-      instructions += Drop();
-    } else if (initializer->IsRedirectingInitializer()) {
-      RedirectingInitializer* init = RedirectingInitializer::Cast(initializer);
-
-      instructions += LoadLocal(scopes_->this_variable);
-      instructions += PushArgument();
-
-      ASSERT(init->arguments()->types().length() == 0);
-      Array& argument_names = Array::ZoneHandle(Z);
-      instructions += TranslateArguments(init->arguments(), &argument_names);
-
-      const Function& target = Function::ZoneHandle(
-          Z, H.LookupConstructorByKernelConstructor(init->target()));
-      intptr_t argument_count = init->arguments()->count() + 1;
-      instructions += StaticCall(TokenPosition::kNoSource, target,
-                                 argument_count, argument_names);
-      instructions += Drop();
-    } else if (initializer->IsLocalInitializer()) {
-      // The other initializers following this one might read the variable. This
-      // is used e.g. for evaluating the arguments to a super call first, run
-      // normal field initializers next and then make the actual super call:
-      //
-      //   The frontend converts
-      //
-      //      class A {
-      //        var x;
-      //        A(a, b) : super(a + b), x = 2*b {}
-      //      }
-      //
-      //   to
-      //
-      //      class A {
-      //        var x;
-      //        A(a, b) : tmp = a + b, x = 2*b, super(tmp) {}
-      //      }
-      //
-      // (This is strictly speaking not what one should do in terms of the
-      //  specification but that is how it is currently implemented.)
-      LocalInitializer* init = LocalInitializer::Cast(initializer);
-
-      VariableDeclaration* declaration = init->variable();
-      LocalVariable* variable = LookupVariable(declaration);
-      Expression* initializer = init->variable()->initializer();
-      ASSERT(initializer != NULL);
-      ASSERT(!declaration->IsConst());
-
-      instructions += TranslateExpression(initializer);
-      instructions += StoreLocal(TokenPosition::kNoSource, variable);
-      instructions += Drop();
-
-      fragment_ = instructions;
-    } else {
-      UNIMPLEMENTED();
-    }
-  }
-  return instructions;
-}
-
-
-Fragment FlowGraphBuilder::TranslateStatement(Statement* statement) {
-#ifdef DEBUG
-  intptr_t original_context_depth = context_depth_;
-#endif
-
-  // TODO(jensj): VariableDeclaration doesn't necessarily have a tag.
-  if (statement->can_stream() &&
-      statement->Type() != Node::kTypeVariableDeclaration) {
-    fragment_ = streaming_flow_graph_builder_->BuildStatementAt(
-        statement->kernel_offset());
-  } else {
-    statement->AcceptStatementVisitor(this);
-  }
-  DEBUG_ASSERT(context_depth_ == original_context_depth);
-  return fragment_;
-}
-
-
-Fragment FlowGraphBuilder::TranslateCondition(Expression* expression,
-                                              bool* negate) {
-  *negate = expression->IsNot();
-  Fragment instructions;
-  if (*negate) {
-    instructions += TranslateExpression(Not::Cast(expression)->expression());
-  } else {
-    instructions += TranslateExpression(expression);
-  }
-  instructions += CheckBooleanInCheckedMode();
-  return instructions;
-}
-
-
-Fragment FlowGraphBuilder::TranslateExpression(Expression* expression) {
-  if (expression->can_stream()) {
-    fragment_ = streaming_flow_graph_builder_->BuildExpressionAt(
-        expression->kernel_offset());
-  } else {
-    expression->AcceptExpressionVisitor(this);
-  }
-  return fragment_;
-}
-
-
 ArgumentArray FlowGraphBuilder::GetArguments(int count) {
   ArgumentArray arguments =
       new (Z) ZoneGrowableArray<PushArgumentInstr*>(Z, count);
   arguments->SetLength(count);
   for (intptr_t i = count - 1; i >= 0; --i) {
     ASSERT(stack_->definition()->IsPushArgument());
     ASSERT(!stack_->definition()->HasSSATemp());
     arguments->data()[i] = stack_->definition()->AsPushArgument();
     Drop();
   }
   pending_argument_count_ -= count;
   ASSERT(pending_argument_count_ >= 0);
   return arguments;
 }
 
 
 #define STREAM_EXPRESSION_IF_POSSIBLE(node)                                    \
   if (node->can_stream()) {                                                    \
     fragment_ = streaming_flow_graph_builder_->BuildExpressionAt(              \
         node->kernel_offset());                                                \
     return;                                                                    \
   }
 
 
-void FlowGraphBuilder::VisitInvalidExpression(InvalidExpression* node) {
-  fragment_ =
-      streaming_flow_graph_builder_->BuildExpressionAt(node->kernel_offset());
-}
-
-
-void FlowGraphBuilder::VisitNullLiteral(NullLiteral* node) {
-  fragment_ =
-      streaming_flow_graph_builder_->BuildExpressionAt(node->kernel_offset());
-}
-
-
-void FlowGraphBuilder::VisitBoolLiteral(BoolLiteral* node) {
-  fragment_ =
-      streaming_flow_graph_builder_->BuildExpressionAt(node->kernel_offset());
-}
-
-
-void FlowGraphBuilder::VisitIntLiteral(IntLiteral* node) {
-  fragment_ =
-      streaming_flow_graph_builder_->BuildExpressionAt(node->kernel_offset());
-}
-
-
-void FlowGraphBuilder::VisitBigintLiteral(BigintLiteral* node) {
-  fragment_ =
-      streaming_flow_graph_builder_->BuildExpressionAt(node->kernel_offset());
-}
-
-
-void FlowGraphBuilder::VisitDoubleLiteral(DoubleLiteral* node) {
-  fragment_ =
-      streaming_flow_graph_builder_->BuildExpressionAt(node->kernel_offset());
-}
-
-
-void FlowGraphBuilder::VisitStringLiteral(StringLiteral* node) {
-  fragment_ =
-      streaming_flow_graph_builder_->BuildExpressionAt(node->kernel_offset());
-}
-
-
-void FlowGraphBuilder::VisitSymbolLiteral(SymbolLiteral* node) {
-  fragment_ =
-      streaming_flow_graph_builder_->BuildExpressionAt(node->kernel_offset());
-}
-
-
 AbstractType& DartTypeTranslator::TranslateType(DartType* node) {
   node->AcceptDartTypeVisitor(this);
 
   // We return a new `ZoneHandle` here on purpose: The intermediate language
   // instructions do not make a copy of the handle, so we do it.
   return AbstractType::ZoneHandle(Z, result_.raw());
 }
 
 
 AbstractType& DartTypeTranslator::TranslateTypeWithoutFinalization(
@@ skipping 279 matching lines @@
   }
   type = Type::New(klass, TypeArguments::Handle(Z, klass.type_parameters()),
                    klass.token_pos());
   if (klass.is_type_finalized()) {
     type ^= ClassFinalizer::FinalizeType(klass, type);
     klass.SetCanonicalType(type);
   }
   return type;
 }
 
-void FlowGraphBuilder::VisitTypeLiteral(TypeLiteral* node) {
-  STREAM_EXPRESSION_IF_POSSIBLE(node);
-
-  const AbstractType& type = T.TranslateType(node->type());
-  if (type.IsMalformed()) H.ReportError("Malformed type literal");
-
-  Fragment instructions;
-  if (type.IsInstantiated()) {
-    instructions += Constant(type);
-  } else {
-    if (!type.IsInstantiated(kCurrentClass)) {
-      instructions += LoadInstantiatorTypeArguments();
-    } else {
-      instructions += NullConstant();
-    }
-    if (!type.IsInstantiated(kFunctions)) {
-      instructions += LoadFunctionTypeArguments();
-    } else {
-      instructions += NullConstant();
-    }
-    instructions += InstantiateType(type);
-  }
-  fragment_ = instructions;
-}
-
-
-void FlowGraphBuilder::VisitVariableGet(VariableGet* node) {
-  fragment_ =
-      streaming_flow_graph_builder_->BuildExpressionAt(node->kernel_offset());
-}
-
-
-void FlowGraphBuilder::VisitVariableSet(VariableSet* node) {
-  STREAM_EXPRESSION_IF_POSSIBLE(node);
-
-  Fragment instructions = TranslateExpression(node->expression());
-  if (NeedsDebugStepCheck(stack_, node->position())) {
-    instructions = DebugStepCheck(node->position()) + instructions;
-  }
-  instructions += CheckVariableTypeInCheckedMode(node->variable());
-  instructions +=
-      StoreLocal(node->position(), LookupVariable(node->variable()));
-  fragment_ = instructions;
-}
-
-
-void FlowGraphBuilder::VisitStaticGet(StaticGet* node) {
-  STREAM_EXPRESSION_IF_POSSIBLE(node);
-
-  // A StaticGet will always have a kernel_offset, except for the StaticGet that
-  // was manually created for _getMainClosure in dart:_builtin.  Compile that
-  // one specially here.
-  const dart::Library& builtin =
-      dart::Library::Handle(Z, I->object_store()->builtin_library());
-  const Object& main =
-      Object::Handle(Z, builtin.LookupObjectAllowPrivate(dart::String::Handle(
-                            Z, dart::String::New("main"))));
-  if (main.IsField()) {
-    UNIMPLEMENTED();
-  } else if (main.IsFunction()) {
-    const Function& function = Function::Cast(main);
-    if (function.kind() == RawFunction::kRegularFunction) {
-      const Function& closure_function =
-          Function::Handle(Z, function.ImplicitClosureFunction());
-      closure_function.set_kernel_function(function.kernel_function());
-      const Instance& closure =
-          Instance::ZoneHandle(Z, closure_function.ImplicitStaticClosure());
-      fragment_ = Constant(closure);
-    } else {
-      UNIMPLEMENTED();
-    }
-  } else {
-    UNIMPLEMENTED();
-  }
-}
-
-
-void FlowGraphBuilder::VisitStaticSet(StaticSet* node) {
-  STREAM_EXPRESSION_IF_POSSIBLE(node);
-
-  NameIndex target = node->target();
-  if (H.IsField(target)) {
-    const dart::Field& field =
-        dart::Field::ZoneHandle(Z, H.LookupFieldByKernelField(target));
-    const AbstractType& dst_type = AbstractType::ZoneHandle(Z, field.type());
-    Fragment instructions = TranslateExpression(node->expression());
-    if (NeedsDebugStepCheck(stack_, node->position())) {
-      instructions = DebugStepCheck(node->position()) + instructions;
-    }
-    instructions += CheckAssignableInCheckedMode(
-        dst_type, dart::String::ZoneHandle(Z, field.name()));
-    LocalVariable* variable = MakeTemporary();
-    instructions += LoadLocal(variable);
-    fragment_ = instructions + StoreStaticField(node->position(), field);
-  } else {
-    ASSERT(H.IsProcedure(target));
-
-    // Evaluate the expression on the right hand side.
-    Fragment instructions = TranslateExpression(node->expression());
-    LocalVariable* variable = MakeTemporary();
-
-    // Prepare argument.
-    instructions += LoadLocal(variable);
-    instructions += PushArgument();
-
-    // Invoke the setter function.
-    const Function& function =
-        Function::ZoneHandle(Z, H.LookupStaticMethodByKernelProcedure(target));
-    instructions += StaticCall(node->position(), function, 1);
-
-    // Drop the unused result & leave the stored value on the stack.
-    fragment_ = instructions + Drop();
-  }
-}
-
-
-void FlowGraphBuilder::VisitPropertyGet(PropertyGet* node) {
-  STREAM_EXPRESSION_IF_POSSIBLE(node);
-
-  Fragment instructions = TranslateExpression(node->receiver());
-  instructions += PushArgument();
-  const dart::String& getter_name = H.DartGetterName(node->name());
-  fragment_ = instructions +
-              InstanceCall(node->position(), getter_name, Token::kGET, 1);
-}
-
-
-void FlowGraphBuilder::VisitPropertySet(PropertySet* node) {
-  STREAM_EXPRESSION_IF_POSSIBLE(node);
-
-  Fragment instructions(NullConstant());
-  LocalVariable* variable = MakeTemporary();
-  instructions += TranslateExpression(node->receiver());
-  instructions += PushArgument();
-  instructions += TranslateExpression(node->value());
-  instructions += StoreLocal(TokenPosition::kNoSource, variable);
-  instructions += PushArgument();
-
-  const dart::String& setter_name = H.DartSetterName(node->name());
-  instructions += InstanceCall(node->position(), setter_name, Token::kSET, 2);
-  fragment_ = instructions + Drop();
-}
-
-
-void FlowGraphBuilder::VisitDirectPropertyGet(DirectPropertyGet* node) {
-  STREAM_EXPRESSION_IF_POSSIBLE(node);
-
-  Function& target = Function::ZoneHandle(Z);
-  NameIndex kernel_name = node->target();
-  if (H.IsProcedure(kernel_name)) {
-    if (H.IsGetter(kernel_name)) {
-      target = LookupMethodByMember(kernel_name, H.DartGetterName(kernel_name));
-    } else {
-      target = LookupMethodByMember(kernel_name, H.DartMethodName(kernel_name));
-      target = target.ImplicitClosureFunction();
-      ASSERT(!target.IsNull());
-      fragment_ = BuildImplicitClosureCreation(target);
-      return;
-    }
-  } else {
-    ASSERT(H.IsField(kernel_name));
-    const dart::String& getter_name = H.DartGetterName(kernel_name);
-    target = LookupMethodByMember(kernel_name, getter_name);
-    ASSERT(target.IsGetterFunction() || target.IsImplicitGetterFunction());
-  }
-
-  Fragment instructions = TranslateExpression(node->receiver());
-  instructions += PushArgument();
-  fragment_ = instructions + StaticCall(node->position(), target, 1);
-}
-
-
-void FlowGraphBuilder::VisitDirectPropertySet(DirectPropertySet* node) {
-  STREAM_EXPRESSION_IF_POSSIBLE(node);
-
-  const dart::String& method_name = H.DartSetterName(node->target());
-  const Function& target = Function::ZoneHandle(
-      Z, LookupMethodByMember(node->target(), method_name));
-  ASSERT(target.IsSetterFunction() || target.IsImplicitSetterFunction());
-
-  Fragment instructions(NullConstant());
-  LocalVariable* value = MakeTemporary();
-  instructions += TranslateExpression(node->receiver());
-  instructions += PushArgument();
-  instructions += TranslateExpression(node->value());
-  instructions += StoreLocal(TokenPosition::kNoSource, value);
-  instructions += PushArgument();
-  instructions += StaticCall(node->position(), target, 2);
-
-  fragment_ = instructions + Drop();
-}
-
-
-void FlowGraphBuilder::VisitStaticInvocation(StaticInvocation* node) {
-  STREAM_EXPRESSION_IF_POSSIBLE(node);
-
-  const Function& target = Function::ZoneHandle(
-      Z, H.LookupStaticMethodByKernelProcedure(node->procedure()));
-  const dart::Class& klass = dart::Class::ZoneHandle(Z, target.Owner());
-  intptr_t argument_count = node->arguments()->count();
-  if (target.IsGenerativeConstructor() || target.IsFactory()) {
-    // The VM requires a TypeArguments object as first parameter for
-    // every factory constructor.
-    ++argument_count;
-  }
-
-  List<NamedExpression>& named = node->arguments()->named();
-  const Array& argument_names = H.ArgumentNames(&named);
-
-  // The frontend ensures we the [StaticInvocation] has matching arguments.
-  ASSERT(target.AreValidArguments(argument_count, argument_names, NULL));
-
-  Fragment instructions;
-  LocalVariable* instance_variable = NULL;
-
-  // If we cross the Kernel -> VM core library boundary, a [StaticInvocation]
-  // can appear, but the thing we're calling is not a static method, but a
-  // factory constructor.
-  // The `H.LookupStaticmethodByKernelProcedure` will potentially resolve to the
-  // forwarded constructor.
-  // In that case we'll make an instance and pass it as first argument.
-  //
-  // TODO(27590): Get rid of this after we're using core libraries compiled
-  // into Kernel.
-  if (target.IsGenerativeConstructor()) {
-    if (klass.NumTypeArguments() > 0) {
-      List<DartType>& kernel_type_arguments = node->arguments()->types();
-      const TypeArguments& type_arguments =
-          T.TranslateInstantiatedTypeArguments(
-              klass, kernel_type_arguments.raw_array(),
-              kernel_type_arguments.length());
-      instructions += TranslateInstantiatedTypeArguments(type_arguments);
-      instructions += PushArgument();
-      instructions += AllocateObject(klass, 1);
-    } else {
-      instructions += AllocateObject(klass, 0);
-    }
-
-    instance_variable = MakeTemporary();
-
-    instructions += LoadLocal(instance_variable);
-    instructions += PushArgument();
-  } else if (target.IsFactory()) {
-    // The VM requires currently a TypeArguments object as first parameter for
-    // every factory constructor :-/ !
-    //
-    // TODO(27590): Get rid of this after we're using core libraries compiled
-    // into Kernel.
-    List<DartType>& kernel_type_arguments = node->arguments()->types();
-
-    const TypeArguments& type_arguments = T.TranslateInstantiatedTypeArguments(
-        klass, kernel_type_arguments.raw_array(),
-        kernel_type_arguments.length());
-
-    instructions += TranslateInstantiatedTypeArguments(type_arguments);
-    instructions += PushArgument();
-  } else {
-    // TODO(28109) Support generic methods in the VM or reify them away.
-  }
-
-  // Special case identical(x, y) call.
-  // TODO(27590) consider moving this into the inliner and force inline it
-  // there.
-  if (klass.IsTopLevel() && (klass.library() == dart::Library::CoreLibrary()) &&
-      (target.name() == Symbols::Identical().raw())) {
-    ASSERT(argument_count == 2);
-
-    List<Expression>& positional = node->arguments()->positional();
-    for (intptr_t i = 0; i < positional.length(); ++i) {
-      instructions += TranslateExpression(positional[i]);
-    }
-    instructions += StrictCompare(Token::kEQ_STRICT, /*number_check=*/true);
-  } else {
-    instructions += TranslateArguments(node->arguments(), NULL);
-    instructions +=
-        StaticCall(node->position(), target, argument_count, argument_names);
-
-    if (target.IsGenerativeConstructor()) {
-      // Drop the result of the constructor call and leave [instance_variable]
-      // on top-of-stack.
-      instructions += Drop();
-    }
-  }
-
-  fragment_ = instructions;
-}
-
-
-static bool IsNumberLiteral(Node* node) {
-  return node->IsIntLiteral() || node->IsDoubleLiteral();
-}
-
-template <class Invocation>
-bool FlowGraphBuilder::RecognizeComparisonWithNull(Token::Kind token_kind,
-                                                   Invocation* node) {
-  if (token_kind == Token::kEQ || token_kind == Token::kNE) {
-    if (node->arguments()->positional().length() != 1) return false;
-    Fragment instructions;
-    Expression* left = node->receiver();
-    Expression* right = node->arguments()->positional()[0];
-    if (left->IsNullLiteral() || right->IsNullLiteral()) {
-      instructions += TranslateExpression(left);
-      instructions += TranslateExpression(right);
-      Token::Kind strict_cmp_kind =
-          token_kind == Token::kEQ ? Token::kEQ_STRICT : Token::kNE_STRICT;
-      fragment_ = instructions + StrictCompare(strict_cmp_kind,
-                                               /*number_check = */ true);
-      return true;
-    }
-  }
-  return false;
-}
-
-
-void FlowGraphBuilder::VisitMethodInvocation(MethodInvocation* node) {
-  STREAM_EXPRESSION_IF_POSSIBLE(node);
-
-  const dart::String& name = H.DartMethodName(node->name());
-  const intptr_t argument_count = node->arguments()->count() + 1;
-  const Token::Kind token_kind = MethodKind(name);
-  if (IsNumberLiteral(node->receiver())) {
-    if ((argument_count == 1) && (token_kind == Token::kNEGATE)) {
-      const Object& result = constant_evaluator_.EvaluateExpressionSafe(node);
-      if (!result.IsError()) {
-        fragment_ = Constant(result);
-        return;
-      }
-    } else if ((argument_count == 2) &&
-               Token::IsBinaryArithmeticOperator(token_kind) &&
-               IsNumberLiteral(node->arguments()->positional()[0])) {
-      const Object& result = constant_evaluator_.EvaluateExpressionSafe(node);
-      if (!result.IsError()) {
-        fragment_ = Constant(result);
-        return;
-      }
-    }
-  }
-
-  if (RecognizeComparisonWithNull(token_kind, node)) return;
-
-  Fragment instructions = TranslateExpression(node->receiver());
-  instructions += PushArgument();
-
-  // TODO(28109) Support generic methods in the VM or reify them away.
-  Array& argument_names = Array::ZoneHandle(Z);
-  instructions += TranslateArguments(node->arguments(), &argument_names);
-
-  intptr_t num_args_checked = 1;
-  // If we have a special operation (e.g. +/-/==) we mark both arguments as
-  // to be checked.
-  if (token_kind != Token::kILLEGAL) {
-    ASSERT(argument_count <= 2);
-    num_args_checked = argument_count;
-  }
-
-  fragment_ = instructions + InstanceCall(node->position(), name, token_kind,
-                                          argument_count, argument_names,
-                                          num_args_checked);
-  // Later optimization passes assume that result of a x.[]=(...) call is not
-  // used. We must guarantee this invariant because violation will lead to an
-  // illegal IL once we replace x.[]=(...) with a sequence that does not
-  // actually produce any value. See http://dartbug.com/29135 for more details.
-  if (name.raw() == Symbols::AssignIndexToken().raw()) {
-    fragment_ += Drop();
-    fragment_ += NullConstant();
-  }
-}
-
-
-void FlowGraphBuilder::VisitDirectMethodInvocation(
-    DirectMethodInvocation* node) {
-  STREAM_EXPRESSION_IF_POSSIBLE(node);
-
-  const dart::String& method_name = H.DartProcedureName(node->target());
-  const Token::Kind token_kind = MethodKind(method_name);
-
-  if (RecognizeComparisonWithNull(token_kind, node)) return;
-
-  const Function& target = Function::ZoneHandle(
-      Z, LookupMethodByMember(node->target(), method_name));
-
-  intptr_t argument_count = node->arguments()->count() + 1;
-  Array& argument_names = Array::ZoneHandle(Z);
-
-  // TODO(28109) Support generic methods in the VM or reify them away.
-  Fragment instructions = TranslateExpression(node->receiver());
-  instructions += PushArgument();
-  instructions += TranslateArguments(node->arguments(), &argument_names);
-  fragment_ = instructions + StaticCall(node->position(), target,
-                                        argument_count, argument_names);
-}
-
-
-void FlowGraphBuilder::VisitConstructorInvocation(ConstructorInvocation* node) {
-  STREAM_EXPRESSION_IF_POSSIBLE(node);
-
-  if (node->is_const()) {
-    fragment_ =
-        Constant(constant_evaluator_.EvaluateConstructorInvocation(node));
-    return;
-  }
-
-  dart::Class& klass = dart::Class::ZoneHandle(
-      Z, H.LookupClassByKernelClass(H.EnclosingName(node->target())));
-
-  Fragment instructions;
-
-  // Check for malbounded-ness of type.
-  if (I->type_checks()) {
-    List<DartType>& kernel_type_arguments = node->arguments()->types();
-    const TypeArguments& type_arguments = T.TranslateTypeArguments(
-        kernel_type_arguments.raw_array(), kernel_type_arguments.length());
-
-    AbstractType& type = AbstractType::Handle(
-        Z, Type::New(klass, type_arguments, TokenPosition::kNoSource));
-    type = ClassFinalizer::FinalizeType(klass, type);
-
-    if (type.IsMalbounded()) {
-      // Evaluate expressions for correctness.
-      List<Expression>& positional = node->arguments()->positional();
-      List<NamedExpression>& named = node->arguments()->named();
-      for (intptr_t i = 0; i < positional.length(); ++i) {
-        instructions += TranslateExpression(positional[i]);
-        instructions += Drop();
-      }
-      for (intptr_t i = 0; i < named.length(); ++i) {
-        instructions += TranslateExpression(named[i]->expression());
-        instructions += Drop();
-      }
-
-      // Throw an error & keep the [Value] on the stack.
-      instructions += ThrowTypeError();
-
-      // Bail out early.
-      fragment_ = instructions;
-      return;
-    }
-  }
-
-  if (klass.NumTypeArguments() > 0) {
-    List<DartType>& kernel_type_arguments = node->arguments()->types();
-    const TypeArguments& type_arguments = T.TranslateInstantiatedTypeArguments(
-        klass, kernel_type_arguments.raw_array(),
-        kernel_type_arguments.length());
-    if (!klass.IsGeneric()) {
-      Type& type = Type::ZoneHandle(Z, T.ReceiverType(klass).raw());
-
-      // TODO(27590): Can we move this code into [ReceiverType]?
-      type ^= ClassFinalizer::FinalizeType(*active_class_.klass, type,
-                                           ClassFinalizer::kFinalize);
-      ASSERT(!type.IsMalformedOrMalbounded());
-
-      TypeArguments& canonicalized_type_arguments =
-          TypeArguments::ZoneHandle(Z, type.arguments());
-      canonicalized_type_arguments =
-          canonicalized_type_arguments.Canonicalize();
-      instructions += Constant(canonicalized_type_arguments);
-    } else {
-      instructions += TranslateInstantiatedTypeArguments(type_arguments);
-    }
-
-    instructions += PushArgument();
-    instructions += AllocateObject(klass, 1);
-  } else {
-    instructions += AllocateObject(klass, 0);
-  }
-  LocalVariable* variable = MakeTemporary();
-
-  instructions += LoadLocal(variable);
-  instructions += PushArgument();
-
-  Array& argument_names = Array::ZoneHandle(Z);
-  instructions += TranslateArguments(node->arguments(), &argument_names);
-
-  const Function& target = Function::ZoneHandle(
-      Z, H.LookupConstructorByKernelConstructor(klass, node->target()));
-  intptr_t argument_count = node->arguments()->count() + 1;
-  instructions +=
-      StaticCall(node->position(), target, argument_count, argument_names);
-  fragment_ = instructions + Drop();
-}
-
-
-void FlowGraphBuilder::VisitIsExpression(IsExpression* node) {
-  STREAM_EXPRESSION_IF_POSSIBLE(node);
-
-  Fragment instructions = TranslateExpression(node->operand());
-
-  // The VM does not like an instanceOf call with a dynamic type. We need to
-  // special case this situation.
-  const Type& object_type = Type::Handle(Z, Type::ObjectType());
-  const AbstractType& type = T.TranslateType(node->type());
-  if (type.IsMalformed()) {
-    instructions += Drop();
-    instructions += ThrowTypeError();
-    fragment_ = instructions;
-    return;
-  }
-
-  if (type.IsInstantiated() &&
-      object_type.IsSubtypeOf(type, NULL, NULL, Heap::kOld)) {
-    // Evaluate the expression on the left but ignore it's result.
-    instructions += Drop();
-
-    // Let condition be always true.
-    instructions += Constant(Bool::True());
-  } else {
-    instructions += PushArgument();
-
-    // See if simple instanceOf is applicable.
-    if (dart::FlowGraphBuilder::SimpleInstanceOfType(type)) {
-      instructions += Constant(type);
-      instructions += PushArgument();  // Type.
-      instructions += InstanceCall(
-          node->position(),
-          dart::Library::PrivateCoreLibName(Symbols::_simpleInstanceOf()),
-          Token::kIS, 2, 2);  // 2 checked arguments.
-      fragment_ = instructions;
-      return;
-    }
-
-    if (!type.IsInstantiated(kCurrentClass)) {
-      instructions += LoadInstantiatorTypeArguments();
-    } else {
-      instructions += NullConstant();
-    }
-    instructions += PushArgument();  // Instantiator type arguments.
-
-    if (!type.IsInstantiated(kFunctions)) {
-      instructions += LoadFunctionTypeArguments();
-    } else {
-      instructions += NullConstant();
-    }
-    instructions += PushArgument();  // Function type arguments.
-
-    instructions += Constant(type);
-    instructions += PushArgument();  // Type.
-
-    instructions +=
-        InstanceCall(node->position(),
-                     dart::Library::PrivateCoreLibName(Symbols::_instanceOf()),
-                     Token::kIS, 4);
-  }
-
-  fragment_ = instructions;
-}
-
-
-void FlowGraphBuilder::VisitAsExpression(AsExpression* node) {
-  STREAM_EXPRESSION_IF_POSSIBLE(node);
-
-  Fragment instructions = TranslateExpression(node->operand());
-
-  // The VM does not like an Object_as call with a dynamic type. We need to
-  // special case this situation.
-  const Type& object_type = Type::Handle(Z, Type::ObjectType());
-  const AbstractType& type = T.TranslateType(node->type());
-  if (type.IsMalformed()) {
-    instructions += Drop();
-    instructions += ThrowTypeError();
-    fragment_ = instructions;
-    return;
-  }
-
-  if (type.IsInstantiated() &&
-      object_type.IsSubtypeOf(type, NULL, NULL, Heap::kOld)) {
-    // We already evaluated the operand on the left and just leave it there as
-    // the result of the `obj as dynamic` expression.
-  } else {
-    instructions += PushArgument();
-
-    if (!type.IsInstantiated(kCurrentClass)) {
-      instructions += LoadInstantiatorTypeArguments();
-    } else {
-      instructions += NullConstant();
-    }
-    instructions += PushArgument();  // Instantiator type arguments.
-
-    if (!type.IsInstantiated(kFunctions)) {
-      instructions += LoadFunctionTypeArguments();
-    } else {
-      instructions += NullConstant();
-    }
-    instructions += PushArgument();  // Function type arguments.
-
-    instructions += Constant(type);
-    instructions += PushArgument();  // Type.
-
-    instructions += InstanceCall(
-        node->position(), dart::Library::PrivateCoreLibName(Symbols::_as()),
-        Token::kAS, 4);
-  }
-
-  fragment_ = instructions;
-}
-
-
-void FlowGraphBuilder::VisitConditionalExpression(ConditionalExpression* node) {
-  STREAM_EXPRESSION_IF_POSSIBLE(node);
-
-  bool negate;
-  Fragment instructions = TranslateCondition(node->condition(), &negate);
-
-  TargetEntryInstr* then_entry;
-  TargetEntryInstr* otherwise_entry;
-  instructions += BranchIfTrue(&then_entry, &otherwise_entry, negate);
-
-  Value* top = stack_;
-  Fragment then_fragment(then_entry);
-  then_fragment += TranslateExpression(node->then());
-  then_fragment += StoreLocal(TokenPosition::kNoSource,
-                              parsed_function_->expression_temp_var());
-  then_fragment += Drop();
-  ASSERT(stack_ == top);
-
-  Fragment otherwise_fragment(otherwise_entry);
-  otherwise_fragment += TranslateExpression(node->otherwise());
-  otherwise_fragment += StoreLocal(TokenPosition::kNoSource,
-                                   parsed_function_->expression_temp_var());
-  otherwise_fragment += Drop();
-  ASSERT(stack_ == top);
-
-  JoinEntryInstr* join = BuildJoinEntry();
-  then_fragment += Goto(join);
-  otherwise_fragment += Goto(join);
-
-  fragment_ = Fragment(instructions.entry, join) +
-              LoadLocal(parsed_function_->expression_temp_var());
-}
-
-
-void FlowGraphBuilder::VisitLogicalExpression(LogicalExpression* node) {
-  STREAM_EXPRESSION_IF_POSSIBLE(node);
-
-  bool negate;
-  Fragment instructions = TranslateCondition(node->left(), &negate);
-  TargetEntryInstr* right_entry;
-  TargetEntryInstr* constant_entry;
-
-  if (node->op() == LogicalExpression::kAnd) {
-    instructions += BranchIfTrue(&right_entry, &constant_entry, negate);
-  } else {
-    instructions += BranchIfTrue(&constant_entry, &right_entry, negate);
-  }
-
-  Value* top = stack_;
-  Fragment right_fragment(right_entry);
-  right_fragment += TranslateCondition(node->right(), &negate);
-  right_fragment += Constant(Bool::True());
-  right_fragment +=
-      StrictCompare(negate ? Token::kNE_STRICT : Token::kEQ_STRICT);
-  right_fragment += StoreLocal(TokenPosition::kNoSource,
-                               parsed_function_->expression_temp_var());
-  right_fragment += Drop();
-
-  ASSERT(top == stack_);
-  Fragment constant_fragment(constant_entry);
-  constant_fragment +=
-      Constant(Bool::Get(node->op() == LogicalExpression::kOr));
-  constant_fragment += StoreLocal(TokenPosition::kNoSource,
-                                  parsed_function_->expression_temp_var());
-  constant_fragment += Drop();
-
-  JoinEntryInstr* join = BuildJoinEntry();
-  right_fragment += Goto(join);
-  constant_fragment += Goto(join);
-
-  fragment_ = Fragment(instructions.entry, join) +
-              LoadLocal(parsed_function_->expression_temp_var());
-}
-
-
-void FlowGraphBuilder::VisitNot(Not* node) {
-  STREAM_EXPRESSION_IF_POSSIBLE(node);
-
-  Fragment instructions = TranslateExpression(node->expression());
-  instructions += CheckBooleanInCheckedMode();
-  instructions += BooleanNegate();
-  fragment_ = instructions;
-}
-
-
-void FlowGraphBuilder::VisitThisExpression(ThisExpression* node) {
-  fragment_ =
-      streaming_flow_graph_builder_->BuildExpressionAt(node->kernel_offset());
-}
-
-
-void FlowGraphBuilder::VisitStringConcatenation(StringConcatenation* node) {
-  STREAM_EXPRESSION_IF_POSSIBLE(node);
-
-  List<Expression>& expressions = node->expressions();
-
-  Fragment instructions;
-
-  if (node->expressions().length() == 1) {
-    instructions += TranslateExpression(node->expressions()[0]);
-    instructions += StringInterpolateSingle(node->position());
-  } else {
-    // The type arguments for CreateArray.
-    instructions += Constant(TypeArguments::ZoneHandle(Z));
-    instructions += IntConstant(expressions.length());
-    instructions += CreateArray();
-    LocalVariable* array = MakeTemporary();
-
-    for (intptr_t i = 0; i < node->expressions().length(); i++) {
-      instructions += LoadLocal(array);
-      instructions += IntConstant(i);
-      instructions += TranslateExpression(node->expressions()[i]);
-      instructions += StoreIndexed(kArrayCid);
-      instructions += Drop();
-    }
-
-    instructions += StringInterpolate(node->position());
-  }
-  fragment_ = instructions;
-}
-
-
-void FlowGraphBuilder::VisitListLiteral(ListLiteral* node) {
-  STREAM_EXPRESSION_IF_POSSIBLE(node);
-
-  if (node->is_const()) {
-    fragment_ = Constant(constant_evaluator_.EvaluateListLiteral(node));
-    return;
-  }
-
-  DartType* types[] = {node->type()};
-  const TypeArguments& type_arguments = T.TranslateTypeArguments(types, 1);
-
-  // The type argument for the factory call.
-  Fragment instructions = TranslateInstantiatedTypeArguments(type_arguments);
-  instructions += PushArgument();
-  List<Expression>& expressions = node->expressions();
-  if (expressions.length() == 0) {
-    instructions += Constant(Object::empty_array());
-  } else {
-    // The type arguments for CreateArray.
-    instructions += Constant(TypeArguments::ZoneHandle(Z));
-    instructions += IntConstant(expressions.length());
-    instructions += CreateArray();
-
-    LocalVariable* array = MakeTemporary();
-    for (intptr_t i = 0; i < expressions.length(); ++i) {
-      instructions += LoadLocal(array);
-      instructions += IntConstant(i);
-      instructions += TranslateExpression(expressions[i]);
-      instructions += StoreIndexed(kArrayCid);
-      instructions += Drop();
-    }
-  }
-  instructions += PushArgument();  // The array.
-
-  const dart::Class& factory_class =
-      dart::Class::Handle(Z, dart::Library::LookupCoreClass(Symbols::List()));
-  const Function& factory_method = Function::ZoneHandle(
-      Z, factory_class.LookupFactory(
-             dart::Library::PrivateCoreLibName(Symbols::ListLiteralFactory())));
-  fragment_ = instructions + StaticCall(node->position(), factory_method, 2);
-}
-
-
-void FlowGraphBuilder::VisitMapLiteral(MapLiteral* node) {
-  STREAM_EXPRESSION_IF_POSSIBLE(node);
-
-  if (node->is_const()) {
-    fragment_ = Constant(constant_evaluator_.EvaluateMapLiteral(node));
-    return;
-  }
-
-  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())));
-
-  DartType* types[] = {node->key_type(), node->value_type()};
-  const TypeArguments& type_arguments = T.TranslateTypeArguments(types, 2);
-
-  // The type argument for the factory call `new Map<K, V>._fromLiteral(List)`.
-  Fragment instructions = TranslateInstantiatedTypeArguments(type_arguments);
-  instructions += PushArgument();
-
-  List<MapEntry>& entries = node->entries();
-  if (entries.length() == 0) {
-    instructions += Constant(Object::empty_array());
-  } else {
-    // The type arguments for `new List<X>(int len)`.
-    instructions += Constant(TypeArguments::ZoneHandle(Z));
-
-    // We generate a list of tuples, i.e. [key1, value1, ..., keyN, valueN].
-    instructions += IntConstant(2 * entries.length());
-    instructions += CreateArray();
-
-    LocalVariable* array = MakeTemporary();
-    for (intptr_t i = 0; i < entries.length(); ++i) {
-      instructions += LoadLocal(array);
-      instructions += IntConstant(2 * i);
-      instructions += TranslateExpression(entries[i]->key());
-      instructions += StoreIndexed(kArrayCid);
-      instructions += Drop();
-
-      instructions += LoadLocal(array);
-      instructions += IntConstant(2 * i + 1);
-      instructions += TranslateExpression(entries[i]->value());
-      instructions += StoreIndexed(kArrayCid);
-      instructions += Drop();
-    }
-  }
-  instructions += PushArgument();  // The array.
-
-  fragment_ = instructions + StaticCall(node->position(), factory_method, 2);
-}
-
-
-void FlowGraphBuilder::VisitFunctionExpression(FunctionExpression* node) {
-  fragment_ = TranslateFunctionNode(node->function(), node);
-}
-
-
-void FlowGraphBuilder::VisitLet(Let* node) {
-  STREAM_EXPRESSION_IF_POSSIBLE(node);
-
-  Fragment instructions = TranslateStatement(node->variable());
-  instructions += TranslateExpression(node->body());
-  fragment_ = instructions;
-}
-
-
-void FlowGraphBuilder::VisitThrow(Throw* node) {
-  STREAM_EXPRESSION_IF_POSSIBLE(node);
-
-  Fragment instructions;
-
-  instructions += TranslateExpression(node->expression());
-  if (NeedsDebugStepCheck(stack_, node->position())) {
-    instructions = DebugStepCheck(node->position()) + instructions;
-  }
-  instructions += PushArgument();
-  instructions += ThrowException(node->position());
-  ASSERT(instructions.is_closed());
-
-  fragment_ = instructions;
-}
-
-
-void FlowGraphBuilder::VisitRethrow(Rethrow* node) {
-  fragment_ =
-      streaming_flow_graph_builder_->BuildExpressionAt(node->kernel_offset());
-}
-
-
-Fragment FlowGraphBuilder::TranslateArguments(Arguments* node,
-                                              Array* argument_names) {
-  Fragment instructions;
-
-  List<Expression>& positional = node->positional();
-  for (intptr_t i = 0; i < positional.length(); ++i) {
-    instructions += TranslateExpression(positional[i]);
-    instructions += PushArgument();
-  }
-
-  List<NamedExpression>& named = node->named();
-  if (argument_names != NULL) {
-    *argument_names = H.ArgumentNames(&named).raw();
-  }
-  for (intptr_t i = 0; i < named.length(); ++i) {
-    NamedExpression* named_expression = named[i];
-    instructions += TranslateExpression(named_expression->expression());
-    instructions += PushArgument();
-  }
-  return instructions;
-}
-
-#define STREAM_STATEMENT_IF_POSSIBLE(node)                                     \
-  if (node->can_stream()) {                                                    \
-    fragment_ = streaming_flow_graph_builder_->BuildStatementAt(               \
-        node->kernel_offset());                                                \
-    return;                                                                    \
-  }
-
-
-void FlowGraphBuilder::VisitInvalidStatement(InvalidStatement* node) {
-  fragment_ =
-      streaming_flow_graph_builder_->BuildStatementAt(node->kernel_offset());
-}
-
-
-void FlowGraphBuilder::VisitEmptyStatement(EmptyStatement* node) {
-  fragment_ =
-      streaming_flow_graph_builder_->BuildStatementAt(node->kernel_offset());
-}
-
-
-void FlowGraphBuilder::VisitBlock(Block* node) {
-  STREAM_STATEMENT_IF_POSSIBLE(node);
-
-  Fragment instructions;
-
-  instructions += EnterScope(node);
-  List<Statement>& statements = node->statements();
-  for (intptr_t i = 0; (i < statements.length()) && instructions.is_open();
-       ++i) {
-    instructions += TranslateStatement(statements[i]);
-  }
-  instructions += ExitScope(node);
-
-  fragment_ = instructions;
-}
-
-
-void FlowGraphBuilder::VisitReturnStatement(ReturnStatement* node) {
-  STREAM_STATEMENT_IF_POSSIBLE(node);
-
-  bool inside_try_finally = try_finally_block_ != NULL;
-
-  Fragment instructions = node->expression() == NULL
-                              ? NullConstant()
-                              : TranslateExpression(node->expression());
-  if (instructions.is_open()) {
-    if (inside_try_finally) {
-      ASSERT(scopes_->finally_return_variable != NULL);
-      const Function& function = parsed_function_->function();
-      if (NeedsDebugStepCheck(function, node->position())) {
-        instructions += DebugStepCheck(node->position());
-      }
-      instructions +=
-          StoreLocal(node->position(), scopes_->finally_return_variable);
-      instructions += Drop();
-      instructions += TranslateFinallyFinalizers(NULL, -1);
-      if (instructions.is_open()) {
-        instructions += LoadLocal(scopes_->finally_return_variable);
-        instructions += Return(TokenPosition::kNoSource);
-      }
-    } else {
-      instructions += Return(node->position());
-    }
-  } else {
-    Pop();
-  }
-  fragment_ = instructions;
-}
-
-
-void FlowGraphBuilder::VisitExpressionStatement(ExpressionStatement* node) {
-  STREAM_STATEMENT_IF_POSSIBLE(node);
-
-  Fragment instructions = TranslateExpression(node->expression());
-  instructions += Drop();
-  fragment_ = instructions;
-}
-
-
-void FlowGraphBuilder::VisitVariableDeclaration(VariableDeclaration* node) {
-  LocalVariable* variable = LookupVariable(node);
-  Expression* initializer = node->initializer();
-
-  Fragment instructions;
-  if (initializer == NULL) {
-    instructions += NullConstant();
-  } else {
-    if (node->IsConst()) {
-      const Instance& constant_value =
-          constant_evaluator_.EvaluateExpression(initializer);
-      variable->SetConstValue(constant_value);
-      instructions += Constant(constant_value);
-    } else {
-      instructions += TranslateExpression(initializer);
-      instructions += CheckVariableTypeInCheckedMode(node);
-    }
-  }
-  // Use position of equal sign if it exists. If the equal sign does not exist
-  // use the position of the identifier.
-  TokenPosition debug_position =
-      Utils::Maximum(node->position(), node->equals_position());
-  if (NeedsDebugStepCheck(stack_, debug_position)) {
-    instructions = DebugStepCheck(debug_position) + instructions;
-  }
-  instructions += StoreLocal(node->position(), variable);
-  instructions += Drop();
-  fragment_ = instructions;
-}
-
-
-void FlowGraphBuilder::VisitFunctionDeclaration(FunctionDeclaration* node) {
-  Fragment instructions = DebugStepCheck(node->position());
-  instructions += TranslateFunctionNode(node->function(), node);
-  instructions +=
-      StoreLocal(node->position(), LookupVariable(node->variable()));
-  instructions += Drop();
-  fragment_ = instructions;
-}
-
-
-void FlowGraphBuilder::VisitIfStatement(IfStatement* node) {
-  STREAM_STATEMENT_IF_POSSIBLE(node);
-
-  bool negate;
-  Fragment instructions = TranslateCondition(node->condition(), &negate);
-  TargetEntryInstr* then_entry;
-  TargetEntryInstr* otherwise_entry;
-  instructions += BranchIfTrue(&then_entry, &otherwise_entry, negate);
-
-  Fragment then_fragment(then_entry);
-  then_fragment += TranslateStatement(node->then());
-
-  Fragment otherwise_fragment(otherwise_entry);
-  otherwise_fragment += TranslateStatement(node->otherwise());
-
-  if (then_fragment.is_open()) {
-    if (otherwise_fragment.is_open()) {
-      JoinEntryInstr* join = BuildJoinEntry();
-      then_fragment += Goto(join);
-      otherwise_fragment += Goto(join);
-      fragment_ = Fragment(instructions.entry, join);
-    } else {
-      fragment_ = Fragment(instructions.entry, then_fragment.current);
-    }
-  } else if (otherwise_fragment.is_open()) {
-    fragment_ = Fragment(instructions.entry, otherwise_fragment.current);
-  } else {
-    fragment_ = instructions.closed();
-  }
-}
-
-
-void FlowGraphBuilder::VisitWhileStatement(WhileStatement* node) {
-  STREAM_STATEMENT_IF_POSSIBLE(node);
-
-  ++loop_depth_;
-  bool negate;
-  Fragment condition = TranslateCondition(node->condition(), &negate);
-  TargetEntryInstr* body_entry;
-  TargetEntryInstr* loop_exit;
-  condition += BranchIfTrue(&body_entry, &loop_exit, negate);
-
-  Fragment body(body_entry);
-  body += TranslateStatement(node->body());
-
-  Instruction* entry;
-  if (body.is_open()) {
-    JoinEntryInstr* join = BuildJoinEntry();
-    body += Goto(join);
-
-    Fragment loop(join);
-    loop += CheckStackOverflow();
-    loop += condition;
-    entry = new (Z) GotoInstr(join);
-  } else {
-    entry = condition.entry;
-  }
-
-
-  fragment_ = Fragment(entry, loop_exit);
-  --loop_depth_;
-}
-
-
-void FlowGraphBuilder::VisitDoStatement(DoStatement* node) {
-  STREAM_STATEMENT_IF_POSSIBLE(node);
-
-  ++loop_depth_;
-  Fragment body = TranslateStatement(node->body());
-
-  if (body.is_closed()) {
-    fragment_ = body;
-    --loop_depth_;
-    return;
-  }
-
-  bool negate;
-  JoinEntryInstr* join = BuildJoinEntry();
-  Fragment loop(join);
-  loop += CheckStackOverflow();
-  loop += body;
-  loop += TranslateCondition(node->condition(), &negate);
-  TargetEntryInstr* loop_repeat;
-  TargetEntryInstr* loop_exit;
-  loop += BranchIfTrue(&loop_repeat, &loop_exit, negate);
-
-  Fragment repeat(loop_repeat);
-  repeat += Goto(join);
-
-  fragment_ = Fragment(new (Z) GotoInstr(join), loop_exit);
-  --loop_depth_;
-}
-
-
-void FlowGraphBuilder::VisitForStatement(ForStatement* node) {
-  STREAM_STATEMENT_IF_POSSIBLE(node);
-
-  Fragment declarations;
-
-  bool new_context = false;
-  declarations += EnterScope(node, &new_context);
-
-  List<VariableDeclaration>& variables = node->variables();
-  for (intptr_t i = 0; i < variables.length(); ++i) {
-    declarations += TranslateStatement(variables[i]);
-  }
-
-  ++loop_depth_;
-  bool negate = false;
-  Fragment condition = node->condition() == NULL
-                           ? Constant(Bool::True())
-                           : TranslateCondition(node->condition(), &negate);
-  TargetEntryInstr* body_entry;
-  TargetEntryInstr* loop_exit;
-  condition += BranchIfTrue(&body_entry, &loop_exit, negate);
-
-  Fragment body(body_entry);
-  body += TranslateStatement(node->body());
-
-  if (body.is_open()) {
-    // We allocated a fresh context before the loop which contains captured
-    // [ForStatement] variables.  Before jumping back to the loop entry we clone
-    // the context object (at same depth) which ensures the next iteration of
-    // the body gets a fresh set of [ForStatement] variables (with the old
-    // (possibly updated) values).
-    if (new_context) body += CloneContext();
-
-    List<Expression>& updates = node->updates();
-    for (intptr_t i = 0; i < updates.length(); ++i) {
-      body += TranslateExpression(updates[i]);
-      body += Drop();
-    }
-    JoinEntryInstr* join = BuildJoinEntry();
-    declarations += Goto(join);
-    body += Goto(join);
-
-    Fragment loop(join);
-    loop += CheckStackOverflow();
-    loop += condition;
-  } else {
-    declarations += condition;
-  }
-
-  Fragment loop(declarations.entry, loop_exit);
-  --loop_depth_;
-
-  loop += ExitScope(node);
-
-  fragment_ = loop;
-}
-
-
-void FlowGraphBuilder::VisitForInStatement(ForInStatement* node) {
-  STREAM_STATEMENT_IF_POSSIBLE(node);
-
-  Fragment instructions = TranslateExpression(node->iterable());
-  instructions += PushArgument();
-
-  const dart::String& iterator_getter = dart::String::ZoneHandle(
-      Z, dart::Field::GetterSymbol(Symbols::Iterator()));
-  instructions += InstanceCall(node->iterable()->position(), iterator_getter,
-                               Token::kGET, 1);
-  LocalVariable* iterator = scopes_->iterator_variables[for_in_depth_];
-  instructions += StoreLocal(TokenPosition::kNoSource, iterator);
-  instructions += Drop();
-
-  ++for_in_depth_;
-  ++loop_depth_;
-  Fragment condition = LoadLocal(iterator);
-  condition += PushArgument();
-  condition += InstanceCall(node->iterable()->position(), Symbols::MoveNext(),
-                            Token::kILLEGAL, 1);
-  TargetEntryInstr* body_entry;
-  TargetEntryInstr* loop_exit;
-  condition += BranchIfTrue(&body_entry, &loop_exit);
-
-  Fragment body(body_entry);
-  body += EnterScope(node);
-  body += LoadLocal(iterator);
-  body += PushArgument();
-  const dart::String& current_getter = dart::String::ZoneHandle(
-      Z, dart::Field::GetterSymbol(Symbols::Current()));
-  body += InstanceCall(node->position(), current_getter, Token::kGET, 1);
-  body +=
-      StoreLocal(TokenPosition::kNoSource, LookupVariable(node->variable()));
-  body += Drop();
-  body += TranslateStatement(node->body());
-  body += ExitScope(node);
-
-  if (body.is_open()) {
-    JoinEntryInstr* join = BuildJoinEntry();
-    instructions += Goto(join);
-    body += Goto(join);
-
-    Fragment loop(join);
-    loop += CheckStackOverflow();
-    loop += condition;
-  } else {
-    instructions += condition;
-  }
-
-  fragment_ = Fragment(instructions.entry, loop_exit);
-  --loop_depth_;
-  --for_in_depth_;
-}
-
-
-void FlowGraphBuilder::VisitLabeledStatement(LabeledStatement* node) {
-  STREAM_STATEMENT_IF_POSSIBLE(node);
-
-  // There can be serveral cases:
-  //
-  //   * the body contains a break
-  //   * the body doesn't contain a break
-  //
-  //   * translating the body results in a closed fragment
-  //   * translating the body results in a open fragment
-  //
-  // => We will only know which case we are in after the body has been
-  //    traversed.
-
-  BreakableBlock block(this);
-  Fragment instructions = TranslateStatement(node->body());
-  if (block.HadJumper()) {
-    if (instructions.is_open()) {
-      instructions += Goto(block.destination());
-    }
-    fragment_ = Fragment(instructions.entry, block.destination());
-  } else {
-    fragment_ = instructions;
-  }
-}
-
-
-void FlowGraphBuilder::VisitBreakStatement(BreakStatement* node) {
-  fragment_ =
-      streaming_flow_graph_builder_->BuildStatementAt(node->kernel_offset());
-}
-
-
-void FlowGraphBuilder::VisitSwitchStatement(SwitchStatement* node) {
-  STREAM_STATEMENT_IF_POSSIBLE(node);
-
-  SwitchBlock block(this, node->cases().length());
-
-  // 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.
-  Fragment head_instructions = TranslateExpression(node->condition());
-  head_instructions +=
-      StoreLocal(TokenPosition::kNoSource, scopes_->switch_variable);
-  head_instructions += Drop();
-
-  // Phase 1: Generate bodies and try to find out whether a body will be target
-  // of a jump due to:
-  //   * `continue case_label`
-  //   * `case e1: case e2: body`
-  Fragment* body_fragments = new Fragment[node->cases().length()];
-
-  intptr_t num_cases = node->cases().length();
-  for (intptr_t i = 0; i < num_cases; i++) {
-    SwitchCase* switch_case = node->cases()[i];
-    Fragment& body_fragment = body_fragments[i] =
-        TranslateStatement(switch_case->body());
-
-    if (body_fragment.entry == NULL) {
-      // Make a NOP in order to ensure linking works properly.
-      body_fragment = NullConstant();
-      body_fragment += Drop();
-    }
-
-    // The Dart language specification mandates fall-throughs in [SwitchCase]es
-    // to be runtime errors.
-    if (!switch_case->is_default() && body_fragment.is_open() &&
-        (i < (node->cases().length() - 1))) {
-      const dart::Class& klass = dart::Class::ZoneHandle(
-          Z, dart::Library::LookupCoreClass(Symbols::FallThroughError()));
-      ASSERT(!klass.IsNull());
-      const Function& constructor = Function::ZoneHandle(
-          Z, klass.LookupConstructorAllowPrivate(
-                 H.DartSymbol("FallThroughError._create")));
-      ASSERT(!constructor.IsNull());
-      const dart::String& url = H.DartString(
-          parsed_function_->function().ToLibNamePrefixedQualifiedCString(),
-          Heap::kOld);
-
-      // Create instance of _FallThroughError
-      body_fragment += AllocateObject(klass, 0);
-      LocalVariable* instance = MakeTemporary();
-
-      // Call _FallThroughError._create constructor.
-      body_fragment += LoadLocal(instance);
-      body_fragment += PushArgument();  // this
-
-      body_fragment += Constant(url);
-      body_fragment += PushArgument();  // url
-
-      body_fragment += NullConstant();
-      body_fragment += PushArgument();  // line
-
-      body_fragment += StaticCall(TokenPosition::kNoSource, constructor, 3);
-      body_fragment += Drop();
-
-      // Throw the exception
-      body_fragment += PushArgument();
-      body_fragment += ThrowException(TokenPosition::kNoSource);
-      body_fragment += Drop();
-    }
-
-    // If there is an implicit fall-through we have one [SwitchCase] and
-    // multiple expressions, e.g.
-    //
-    //    switch(expr) {
-    //      case a:
-    //      case b:
-    //        <stmt-body>
-    //    }
-    //
-    // This means that the <stmt-body> will have more than 1 incoming edge (one
-    // from `a == expr` and one from `a != expr && b == expr`). The
-    // `block.Destination()` records the additional jump.
-    if (switch_case->expressions().length() > 1) {
-      block.DestinationDirect(i);
-    }
-  }
-
-  // Phase 2: Generate everything except the real bodies:
-  //   * jump directly to a body (if there is no jumper)
-  //   * jump to a wrapper block which jumps to the body (if there is a jumper)
-  Fragment current_instructions = head_instructions;
-  for (intptr_t i = 0; i < num_cases; i++) {
-    SwitchCase* switch_case = node->cases()[i];
-
-    if (switch_case->is_default()) {
-      ASSERT(i == (node->cases().length() - 1));
-
-      // Evaluate the conditions for the default [SwitchCase] just for the
-      // purpose of potentially triggering a compile-time error.
-      for (intptr_t k = 0; k < switch_case->expressions().length(); k++) {
-        constant_evaluator_.EvaluateExpression(switch_case->expressions()[k]);
-      }
-
-      if (block.HadJumper(i)) {
-        // There are several branches to the body, so we will make a goto to
-        // the join block (and prepend a join instruction to the real body).
-        JoinEntryInstr* join = block.DestinationDirect(i);
-        current_instructions += Goto(join);
-
-        current_instructions = Fragment(current_instructions.entry, join);
-        current_instructions += body_fragments[i];
-      } else {
-        current_instructions += body_fragments[i];
-      }
-    } else {
-      JoinEntryInstr* body_join = NULL;
-      if (block.HadJumper(i)) {
-        body_join = block.DestinationDirect(i);
-        body_fragments[i] = Fragment(body_join) + body_fragments[i];
-      }
-
-      for (intptr_t j = 0; j < switch_case->expressions().length(); j++) {
-        TargetEntryInstr* then;
-        TargetEntryInstr* otherwise;
-
-        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(
-            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).
-          then_fragment += Goto(body_join);
-        } else {
-          // There is only a signle branch to the body, so we will just append
-          // the body fragment.
-          then_fragment += body_fragments[i];
-        }
-
-        current_instructions = Fragment(otherwise);
-      }
-    }
-  }
-
-  bool has_no_default =
-      num_cases > 0 && !node->cases()[num_cases - 1]->is_default();
-  if (has_no_default) {
-    // There is no default, which means we have an open [current_instructions]
-    // (which is a [TargetEntryInstruction] for the last "otherwise" branch).
-    //
-    // Furthermore the last [SwitchCase] can be open as well.  If so, we need
-    // to join these two.
-    Fragment& last_body = body_fragments[node->cases().length() - 1];
-    if (last_body.is_open()) {
-      ASSERT(current_instructions.is_open());
-      ASSERT(current_instructions.current->IsTargetEntry());
-
-      // Join the last "otherwise" branch and the last [SwitchCase] fragment.
-      JoinEntryInstr* join = BuildJoinEntry();
-      current_instructions += Goto(join);
-      last_body += Goto(join);
-
-      current_instructions = Fragment(join);
-    }
-  } else {
-    // All non-default cases will be closed (i.e. break/continue/throw/return)
-    // So it is fine to just let more statements after the switch append to the
-    // default case.
-  }
-
-  delete[] body_fragments;
-
-  fragment_ = Fragment(head_instructions.entry, current_instructions.current);
-}
-
-
-void FlowGraphBuilder::VisitContinueSwitchStatement(
-    ContinueSwitchStatement* node) {
-  fragment_ =
-      streaming_flow_graph_builder_->BuildStatementAt(node->kernel_offset());
-}
-
-
-void FlowGraphBuilder::VisitAssertStatement(AssertStatement* node) {
-  STREAM_STATEMENT_IF_POSSIBLE(node);
-
-  if (!I->asserts()) {
-    fragment_ = Fragment();
-    return;
-  }
-
-  TargetEntryInstr* then;
-  TargetEntryInstr* otherwise;
-
-  Fragment instructions;
-  // Asserts can be of the following two kinds:
-  //
-  //    * `assert(expr)`
-  //    * `assert(() { ... })`
-  //
-  // The call to `_AssertionError._evaluateAssertion()` will take care of both
-  // and returns a boolean.
-  instructions += TranslateExpression(node->condition());
-  instructions += PushArgument();
-  instructions += EvaluateAssertion();
-  instructions += CheckBooleanInCheckedMode();
-  instructions += Constant(Bool::True());
-  instructions += BranchIfEqual(&then, &otherwise, false);
-
-  const dart::Class& klass = dart::Class::ZoneHandle(
-      Z, dart::Library::LookupCoreClass(Symbols::AssertionError()));
-  ASSERT(!klass.IsNull());
-  const Function& constructor =
-      Function::ZoneHandle(Z, klass.LookupConstructorAllowPrivate(
-                                  H.DartSymbol("_AssertionError._create")));
-  ASSERT(!constructor.IsNull());
-
-  const dart::String& url = H.DartString(
-      parsed_function_->function().ToLibNamePrefixedQualifiedCString(),
-      Heap::kOld);
-
-  // Create instance of _AssertionError
-  Fragment otherwise_fragment(otherwise);
-  otherwise_fragment += AllocateObject(klass, 0);
-  LocalVariable* instance = MakeTemporary();
-
-  // Call _AssertionError._create constructor.
-  otherwise_fragment += LoadLocal(instance);
-  otherwise_fragment += PushArgument();  // this
-
-  otherwise_fragment += Constant(H.DartString("<no message>", Heap::kOld));
-  otherwise_fragment += PushArgument();  // failedAssertion
-
-  otherwise_fragment += Constant(url);
-  otherwise_fragment += PushArgument();  // url
-
-  otherwise_fragment += IntConstant(0);
-  otherwise_fragment += PushArgument();  // line
-
-  otherwise_fragment += IntConstant(0);
-  otherwise_fragment += PushArgument();  // column
-
-  otherwise_fragment +=
-      node->message() != NULL
-          ? TranslateExpression(node->message())
-          : Constant(H.DartString("<no message>", Heap::kOld));
-  otherwise_fragment += PushArgument();  // message
-
-  otherwise_fragment += StaticCall(TokenPosition::kNoSource, constructor, 6);
-  otherwise_fragment += Drop();
-
-  // Throw _AssertionError exception.
-  otherwise_fragment += PushArgument();
-  otherwise_fragment += ThrowException(TokenPosition::kNoSource);
-  otherwise_fragment += Drop();
-
-  fragment_ = Fragment(instructions.entry, then);
-}
-
-
-void FlowGraphBuilder::VisitTryFinally(TryFinally* node) {
-  STREAM_STATEMENT_IF_POSSIBLE(node);
-
-  InlineBailout("kernel::FlowgraphBuilder::VisitTryFinally");
-
-  // There are 5 different cases where we need to execute the finally block:
-  //
-  //  a) 1/2/3th case: Special control flow going out of `node->body()`:
-  //
-  //   * [BreakStatement] transfers control to a [LabledStatement]
-  //   * [ContinueSwitchStatement] transfers control to a [SwitchCase]
-  //   * [ReturnStatement] returns a value
-  //
-  //   => All three cases will automatically append all finally blocks
-  //      between the branching point and the destination (so we don't need to
-  //      do anything here).
-  //
-  //  b) 4th case: Translating the body resulted in an open fragment (i.e. body
-  //               executes without any control flow out of it)
-  //
-  //   => We are responsible for jumping out of the body to a new block (with
-  //      different try index) and execute the finalizer.
-  //
-  //  c) 5th case: An exception occured inside the body.
-  //
-  //   => We are responsible for catching it, executing the finally block and
-  //      rethrowing the exception.
-  intptr_t try_handler_index = AllocateTryIndex();
-  Fragment try_body = TryCatch(try_handler_index);
-  JoinEntryInstr* after_try = BuildJoinEntry();
-
-  // Fill in the body of the try.
-  ++try_depth_;
-  {
-    TryFinallyBlock tfb(this, node->finalizer(), -1);
-    TryCatchBlock tcb(this, try_handler_index);
-    try_body += TranslateStatement(node->body());
-  }
-  --try_depth_;
-
-  if (try_body.is_open()) {
-    // Please note: The try index will be on level out of this block,
-    // thereby ensuring if there's an exception in the finally block we
-    // won't run it twice.
-    JoinEntryInstr* finally_entry = BuildJoinEntry();
-
-    try_body += Goto(finally_entry);
-
-    Fragment finally_body(finally_entry);
-    finally_body += TranslateStatement(node->finalizer());
-    finally_body += Goto(after_try);
-  }
-
-  // Fill in the body of the catch.
-  ++catch_depth_;
-  const Array& handler_types = Array::ZoneHandle(Z, Array::New(1, Heap::kOld));
-  handler_types.SetAt(0, Object::dynamic_type());
-  // Note: rethrow will actually force mark the handler as needing a stacktrace.
-  Fragment finally_body = CatchBlockEntry(handler_types, try_handler_index,
-                                          /* needs_stacktrace = */ false);
-  finally_body += TranslateStatement(node->finalizer());
-  if (finally_body.is_open()) {
-    finally_body += LoadLocal(CurrentException());
-    finally_body += PushArgument();
-    finally_body += LoadLocal(CurrentStackTrace());
-    finally_body += PushArgument();
-    finally_body +=
-        RethrowException(TokenPosition::kNoSource, try_handler_index);
-    Drop();
-  }
-  --catch_depth_;
-
-  fragment_ = Fragment(try_body.entry, after_try);
-}
-
-
-void FlowGraphBuilder::VisitTryCatch(class TryCatch* node) {
-  STREAM_STATEMENT_IF_POSSIBLE(node);
-
-  InlineBailout("kernel::FlowgraphBuilder::VisitTryCatch");
-
-  intptr_t try_handler_index = AllocateTryIndex();
-  Fragment try_body = TryCatch(try_handler_index);
-  JoinEntryInstr* after_try = BuildJoinEntry();
-
-  // Fill in the body of the try.
-  ++try_depth_;
-  {
-    TryCatchBlock block(this, try_handler_index);
-    try_body += TranslateStatement(node->body());
-    try_body += Goto(after_try);
-  }
-  --try_depth_;
-
-  ++catch_depth_;
-  const Array& handler_types =
-      Array::ZoneHandle(Z, Array::New(node->catches().length(), Heap::kOld));
-  bool needs_stacktrace = false;
-  for (intptr_t i = 0; i < node->catches().length(); i++) {
-    if (node->catches()[i]->stack_trace() != NULL) {
-      needs_stacktrace = true;
-      break;
-    }
-  }
-  Fragment catch_body =
-      CatchBlockEntry(handler_types, try_handler_index, needs_stacktrace);
-  // Fill in the body of the catch.
-  for (intptr_t i = 0; i < node->catches().length(); i++) {
-    Catch* catch_clause = node->catches()[i];
-
-    Fragment catch_handler_body;
-
-    catch_handler_body += EnterScope(catch_clause);
-
-    if (catch_clause->exception() != NULL) {
-      catch_handler_body += LoadLocal(CurrentException());
-      catch_handler_body += StoreLocal(
-          TokenPosition::kNoSource, LookupVariable(catch_clause->exception()));
-      catch_handler_body += Drop();
-    }
-    if (catch_clause->stack_trace() != NULL) {
-      catch_handler_body += LoadLocal(CurrentStackTrace());
-      catch_handler_body +=
-          StoreLocal(TokenPosition::kNoSource,
-                     LookupVariable(catch_clause->stack_trace()));
-      catch_handler_body += Drop();
-    }
-    AbstractType* type_guard = NULL;
-    if (catch_clause->guard() != NULL &&
-        !catch_clause->guard()->IsDynamicType()) {
-      type_guard = &T.TranslateType(catch_clause->guard());
-      handler_types.SetAt(i, *type_guard);
-    } else {
-      handler_types.SetAt(i, Object::dynamic_type());
-    }
-
-    {
-      CatchBlock block(this, CurrentException(), CurrentStackTrace(),
-                       try_handler_index);
-
-      catch_handler_body += TranslateStatement(catch_clause->body());
-
-      // Note: ExitScope adjusts context_depth_ so even if catch_handler_body
-      // is closed we still need to execute ExitScope for its side effect.
-      catch_handler_body += ExitScope(catch_clause);
-      if (catch_handler_body.is_open()) {
-        catch_handler_body += Goto(after_try);
-      }
-    }
-
-    if (type_guard != NULL) {
-      if (type_guard->IsMalformed()) {
-        catch_body += ThrowTypeError();
-        catch_body += Drop();
-      } else {
-        catch_body += LoadLocal(CurrentException());
-        catch_body += PushArgument();  // exception
-        catch_body += NullConstant();
-        catch_body += PushArgument();  // instantiator type arguments
-        catch_body += NullConstant();
-        catch_body += PushArgument();  // function type arguments
-        catch_body += Constant(*type_guard);
-        catch_body += PushArgument();  // guard type
-        catch_body += InstanceCall(
-            TokenPosition::kNoSource,
-            dart::Library::PrivateCoreLibName(Symbols::_instanceOf()),
-            Token::kIS, 4);
-
-        TargetEntryInstr* catch_entry;
-        TargetEntryInstr* next_catch_entry;
-        catch_body += BranchIfTrue(&catch_entry, &next_catch_entry);
-
-        Fragment(catch_entry) + catch_handler_body;
-        catch_body = Fragment(next_catch_entry);
-      }
-    } else {
-      catch_body += catch_handler_body;
-    }
-  }
-
-  // In case the last catch body was not handling the exception and branching to
-  // after the try block, we will rethrow the exception (i.e. no default catch
-  // handler).
-  if (catch_body.is_open()) {
-    catch_body += LoadLocal(CurrentException());
-    catch_body += PushArgument();
-    catch_body += LoadLocal(CurrentStackTrace());
-    catch_body += PushArgument();
-    catch_body += RethrowException(TokenPosition::kNoSource, try_handler_index);
-    Drop();
-  }
-  --catch_depth_;
-
-  fragment_ = Fragment(try_body.entry, after_try);
-}
-
-
-void FlowGraphBuilder::VisitYieldStatement(YieldStatement* node) {
-  STREAM_STATEMENT_IF_POSSIBLE(node);
-
-  ASSERT(node->is_native());  // Must have been desugared.
-  // Setup yield/continue point:
-  //
-  //   ...
-  //   :await_jump_var = index;
-  //   :await_ctx_var = :current_context_var
-  //   return <expr>
-  //
-  // Continuation<index>:
-  //   Drop(1)
-  //   ...
-  //
-  // BuildGraphOfFunction will create a dispatch that jumps to
-  // Continuation<:await_jump_var> upon entry to the function.
-  //
-  Fragment instructions = IntConstant(yield_continuations_.length() + 1);
-  instructions +=
-      StoreLocal(TokenPosition::kNoSource, scopes_->yield_jump_variable);
-  instructions += Drop();
-  instructions += LoadLocal(parsed_function_->current_context_var());
-  instructions +=
-      StoreLocal(TokenPosition::kNoSource, scopes_->yield_context_variable);
-  instructions += Drop();
-  instructions += TranslateExpression(node->expression());
-  instructions += Return(TokenPosition::kNoSource);
-
-  // Note: DropTempsInstr serves as an anchor instruction. It will not
-  // be linked into the resulting graph.
-  DropTempsInstr* anchor = new (Z) DropTempsInstr(0, NULL);
-  yield_continuations_.Add(YieldContinuation(anchor, CurrentTryIndex()));
-
-  Fragment continuation(instructions.entry, anchor);
-
-  if (parsed_function_->function().IsAsyncClosure() ||
-      parsed_function_->function().IsAsyncGenClosure()) {
-    // If function is async closure or async gen closure it takes three
-    // parameters where the second and the third are exception and stack_trace.
-    // Check if exception is non-null and rethrow it.
-    //
-    //   :async_op([:result, :exception, :stack_trace]) {
-    //     ...
-    //     Continuation<index>:
-    //       if (:exception != null) rethrow(:exception, :stack_trace);
-    //     ...
-    //   }
-    //
-    LocalScope* scope = parsed_function_->node_sequence()->scope();
-    LocalVariable* exception_var = scope->VariableAt(2);
-    LocalVariable* stack_trace_var = scope->VariableAt(3);
-    ASSERT(exception_var->name().raw() == Symbols::ExceptionParameter().raw());
-    ASSERT(stack_trace_var->name().raw() ==
-           Symbols::StackTraceParameter().raw());
-
-    TargetEntryInstr* no_error;
-    TargetEntryInstr* error;
-
-    continuation += LoadLocal(exception_var);
-    continuation += BranchIfNull(&no_error, &error);
-
-    Fragment rethrow(error);
-    rethrow += LoadLocal(exception_var);
-    rethrow += PushArgument();
-    rethrow += LoadLocal(stack_trace_var);
-    rethrow += PushArgument();
-    rethrow +=
-        RethrowException(node->position(), CatchClauseNode::kInvalidTryIndex);
-    Drop();
-
-
-    continuation = Fragment(continuation.entry, no_error);
-  }
-
-  fragment_ = continuation;
-}
-
-
-Fragment FlowGraphBuilder::TranslateFunctionNode(FunctionNode* node,
-                                                 TreeNode* parent) {
-  // The VM has a per-isolate table of functions indexed by the enclosing
-  // function and token position.
-  Function& function = Function::ZoneHandle(Z);
-  for (intptr_t i = 0; i < scopes_->function_scopes.length(); ++i) {
-    if (scopes_->function_scopes[i].kernel_offset != node->kernel_offset()) {
-      continue;
-    }
-
-    TokenPosition position = node->position();
-    if (parent->IsFunctionDeclaration()) {
-      position = FunctionDeclaration::Cast(parent)->position();
-    }
-    if (!position.IsReal()) {
-      // Positions has to be unique in regards to the parent.
-      // A non-real at this point is probably -1, we cannot blindly use that
-      // as others might use it too. Create a new dummy non-real TokenPosition.
-      position = TokenPosition(i).ToSynthetic();
-    }
-
-    // NOTE: This is not TokenPosition in the general sense!
-    function = I->LookupClosureFunction(parsed_function_->function(), position);
-    if (function.IsNull()) {
-      const dart::String* name;
-      if (parent->IsFunctionExpression()) {
-        name = &Symbols::AnonymousClosure();
-      } else {
-        ASSERT(parent->IsFunctionDeclaration());
-        name = &H.DartSymbol(
-            FunctionDeclaration::Cast(parent)->variable()->name());
-      }
-      // NOTE: This is not TokenPosition in the general sense!
-      function = Function::NewClosureFunction(
-          *name, parsed_function_->function(), position);
-
-      function.set_is_debuggable(node->dart_async_marker() ==
-                                 FunctionNode::kSync);
-      switch (node->dart_async_marker()) {
-        case FunctionNode::kSyncStar:
-          function.set_modifier(RawFunction::kSyncGen);
-          break;
-        case FunctionNode::kAsync:
-          function.set_modifier(RawFunction::kAsync);
-          function.set_is_inlinable(!FLAG_causal_async_stacks);
-          break;
-        case FunctionNode::kAsyncStar:
-          function.set_modifier(RawFunction::kAsyncGen);
-          function.set_is_inlinable(!FLAG_causal_async_stacks);
-          break;
-        default:
-          // no special modifier
-          break;
-      }
-      function.set_is_generated_body(node->async_marker() ==
-                                     FunctionNode::kSyncYielding);
-      if (function.IsAsyncClosure() || function.IsAsyncGenClosure()) {
-        function.set_is_inlinable(!FLAG_causal_async_stacks);
-      }
-
-      function.set_end_token_pos(node->end_position());
-      LocalScope* scope = scopes_->function_scopes[i].scope;
-      const ContextScope& context_scope =
-          ContextScope::Handle(Z, scope->PreserveOuterScope(context_depth_));
-      function.set_context_scope(context_scope);
-      function.set_kernel_function(node);
-      KernelReader::SetupFunctionParameters(H, T, dart::Class::Handle(Z),
-                                            function, node,
-                                            false,  // is_method
-                                            true);  // is_closure
-      // Finalize function type.
-      Type& signature_type = Type::Handle(Z, function.SignatureType());
-      signature_type ^=
-          ClassFinalizer::FinalizeType(*active_class_.klass, signature_type);
-      function.SetSignatureType(signature_type);
-
-      I->AddClosureFunction(function);
-    }
-    break;
-  }
-
-  const dart::Class& closure_class =
-      dart::Class::ZoneHandle(Z, I->object_store()->closure_class());
-  ASSERT(!closure_class.IsNull());
-  Fragment instructions = AllocateObject(closure_class, function);
-  LocalVariable* closure = MakeTemporary();
-
-  // TODO(27590): Generic closures need type arguments.
-
-  // Store the function and the context in the closure.
-  instructions += LoadLocal(closure);
-  instructions += Constant(function);
-  instructions +=
-      StoreInstanceField(TokenPosition::kNoSource, Closure::function_offset());
-
-  instructions += LoadLocal(closure);
-  instructions += LoadLocal(parsed_function_->current_context_var());
-  instructions +=
-      StoreInstanceField(TokenPosition::kNoSource, Closure::context_offset());
-
-  return instructions;
-}
-
-
 RawObject* EvaluateMetadata(const dart::Field& metadata_field) {
+  // TODO(jensj)

[Kevin Millikin (Google), 2017/06/12 12:01:51]

TODO what?

[jensj, 2017/06/13 13:42:14]

(as below)

   LongJumpScope jump;
   if (setjmp(*jump.Set()) == 0) {
     Thread* thread = Thread::Current();
     Zone* zone_ = thread->zone();
-
-    TreeNode* kernel_node =
-        reinterpret_cast<TreeNode*>(metadata_field.kernel_field());
-    List<Expression>* metadata_expressions = NULL;
-    if (kernel_node->IsClass()) {
-      metadata_expressions = &Class::Cast(kernel_node)->annotations();
-    } else if (kernel_node->IsProcedure()) {
-      metadata_expressions = &Procedure::Cast(kernel_node)->annotations();
-    } else if (kernel_node->IsField()) {
-      metadata_expressions = &Field::Cast(kernel_node)->annotations();
-    } else if (kernel_node->IsConstructor()) {
-      metadata_expressions = &Constructor::Cast(kernel_node)->annotations();
-    } else {
-      FATAL1("No support for metadata on this type of kernel node %p\n",
-             kernel_node);
-    }
-
     TranslationHelper helper(thread);
     Script& script = Script::Handle(Z, metadata_field.Script());
     helper.SetStringOffsets(
         TypedData::Handle(Z, script.kernel_string_offsets()));
     helper.SetStringData(TypedData::Handle(Z, script.kernel_string_data()));
     helper.SetCanonicalNames(
         TypedData::Handle(Z, script.kernel_canonical_names()));
-    DartTypeTranslator type_translator(&helper, NULL, true);
-    ConstantEvaluator constant_evaluator(/* flow_graph_builder = */ NULL, Z,
-                                         &helper, &type_translator);
 
-    const Array& metadata_values =
-        Array::Handle(Z, Array::New(metadata_expressions->length()));
-
-    for (intptr_t i = 0; i < metadata_expressions->length(); i++) {
-      const Instance& value =
-          constant_evaluator.EvaluateExpression((*metadata_expressions)[i]);
-      metadata_values.SetAt(i, value);
-    }
-
-    return metadata_values.raw();
+    StreamingFlowGraphBuilder streaming_flow_graph_builder(
+        &helper, zone_, script.kernel_data(), script.kernel_data_size());
+    return streaming_flow_graph_builder.EvaluateMetadata(
+        metadata_field.kernel_offset());
   } else {
     Thread* thread = Thread::Current();
     Error& error = Error::Handle();
     error = thread->sticky_error();
     thread->clear_sticky_error();
     return error.raw();
   }
 }
 
 
 RawObject* BuildParameterDescriptor(const Function& function) {
+  // TODO(jensj)

[Kevin Millikin (Google), 2017/06/12 12:01:51]

TODO what?

[jensj, 2017/06/13 13:42:14]

Should have been
```
 // TODO(jensj): Delete this todo.
```

It was a leftover from when I initially just made this return NULL.

   LongJumpScope jump;
   if (setjmp(*jump.Set()) == 0) {
-    TreeNode* kernel_node =
-        reinterpret_cast<TreeNode*>(function.kernel_function());
-    FunctionNode* function_node = NULL;
-    if (kernel_node->IsProcedure()) {
-      function_node = Procedure::Cast(kernel_node)->function();
-    } else if (kernel_node->IsConstructor()) {
-      function_node = Constructor::Cast(kernel_node)->function();
-    } else if (kernel_node->IsFunctionNode()) {
-      function_node = FunctionNode::Cast(kernel_node);
-    } else {
-      UNIMPLEMENTED();
-      return NULL;
-    }
-
     Thread* thread = Thread::Current();
     Zone* zone_ = thread->zone();
     TranslationHelper helper(thread);
     Script& script = Script::Handle(Z, function.script());
     helper.SetStringOffsets(
         TypedData::Handle(Z, script.kernel_string_offsets()));
     helper.SetStringData(TypedData::Handle(Z, script.kernel_string_data()));
     helper.SetCanonicalNames(
         TypedData::Handle(Z, script.kernel_canonical_names()));
-    DartTypeTranslator type_translator(&helper, NULL, true);
-    ConstantEvaluator constant_evaluator(/* flow_graph_builder = */ NULL, Z,
-                                         &helper, &type_translator);
 
-    const intptr_t positional_count =
-        function_node->positional_parameters().length();
-    const intptr_t param_count =
-        positional_count + function_node->named_parameters().length();
-    const Array& param_descriptor = Array::Handle(
-        Array::New(param_count * Parser::kParameterEntrySize, Heap::kOld));
-    for (intptr_t i = 0; i < param_count; ++i) {
-      const intptr_t entry_start = i * Parser::kParameterEntrySize;
-
-      VariableDeclaration* variable;
-      if (i < positional_count) {
-        variable = function_node->positional_parameters()[i];
-      } else {
-        variable = function_node->named_parameters()[i - positional_count];
-      }
-
-      param_descriptor.SetAt(
-          entry_start + Parser::kParameterIsFinalOffset,
-          variable->IsFinal() ? Bool::True() : Bool::False());
-
-      if (variable->initializer() != NULL) {
-        param_descriptor.SetAt(
-            entry_start + Parser::kParameterDefaultValueOffset,
-            constant_evaluator.EvaluateExpression(variable->initializer()));
-      } else {
-        param_descriptor.SetAt(
-            entry_start + Parser::kParameterDefaultValueOffset,
-            Object::null_instance());
-      }
-
-      param_descriptor.SetAt(entry_start + Parser::kParameterMetadataOffset,
-                             /* Issue(28434): Missing parameter metadata. */
-                             Object::null_instance());
-    }
-    return param_descriptor.raw();
+    StreamingFlowGraphBuilder streaming_flow_graph_builder(
+        &helper, zone_, script.kernel_data(), script.kernel_data_size());
+    return streaming_flow_graph_builder.BuildParameterDescriptor(
+        function.kernel_offset());
   } else {
     Thread* thread = Thread::Current();
     Error& error = Error::Handle();
     error = thread->sticky_error();
     thread->clear_sticky_error();
     return error.raw();
   }
 }
 
 
 }  // namespace kernel
 }  // namespace dart
 
 #endif  // !defined(DART_PRECOMPILED_RUNTIME)