Support allocating and calling closures in the new non-optimizing compiler.

runtime/vm/code_generator_x64.cc

Index: runtime/vm/code_generator_x64.cc
diff --git a/runtime/vm/code_generator_x64.cc b/runtime/vm/code_generator_x64.cc
index ca9b1a5e6a9cf9c843980bbd81498e5d69da742a..c52a7ae98e8406997033bb57760a0e9656566288 100644
--- a/runtime/vm/code_generator_x64.cc
+++ b/runtime/vm/code_generator_x64.cc
@@ -356,44 +356,14 @@ void CodeGenerator::GenerateEntryCode() {
   LocalScope* scope = parsed_function_.node_sequence()->scope();
   const int num_fixed_params = function.num_fixed_parameters();
   const int num_opt_params = function.num_optional_parameters();
-  const int num_params = num_fixed_params + num_opt_params;
-  int first_param_index;
-  int first_local_index;
-  int num_copied_params;
-  // Assign indices to parameters and locals.
-  if (num_params == num_fixed_params) {
-    // No need to copy incoming arguments.
-    // The body of the function will access parameter i at fp[1 + num_fixed - i]
-    // and local variable j at fp[-1 - j].
-    first_param_index = 1 + num_params;
-    first_local_index = -1;
-    num_copied_params = 0;
-  } else {
-    // The body of the function will access copied parameter i at fp[-1 - i]
-    // and local j at fp[-1 - num_params - j].
-    first_param_index = -1;
-    first_local_index = -1 - num_params;
-    num_copied_params = num_params;
-    ASSERT(num_copied_params > 0);
-  }
-
-  // Allocate parameters and local variables, either in the local frame or in
-  // the context(s).
-  LocalScope* context_owner = NULL;  // No context needed so far.
-  int first_free_frame_index =
-      scope->AllocateVariables(first_param_index,
-                               num_params,
-                               first_local_index,
-                               scope,  // Initial loop owner.
-                               &context_owner);
-  // Frame indices are relative to the frame pointer and are decreasing.
-  ASSERT(first_free_frame_index <= first_local_index);
-  const int num_locals = first_local_index - first_free_frame_index;
+  const int num_copied_params = parsed_function_.copied_parameter_count();
+  const int stack_slot_count =
+      num_copied_params + parsed_function_.local_count();
+  set_locals_space_size(stack_slot_count * kWordSize);
 
   // Reserve local space for copied incoming and default arguments and locals.
   // TODO(regis): We may give up reserving space on stack for args/locals
   // because pushes of initial values may be more effective than moves.
-  set_locals_space_size((num_copied_params + num_locals) * kWordSize);
   __ EnterFrame(locals_space_size());
 
   // We check the number of passed arguments when we have to copy them due to
@@ -432,11 +402,12 @@ void CodeGenerator::GenerateEntryCode() {
       __ Bind(&argc_in_range);
     }
   } else {
-    ASSERT(first_param_index == -1);
+    ASSERT(parsed_function_.first_parameter_index() == -1);
     // Copy positional arguments.
     // Check that no fewer than num_fixed_params positional arguments are passed
     // in and that no more than num_params arguments are passed in.
     // Passed argument i at fp[1 + argc - i] copied to fp[-1 - i].
+    const int num_params = num_fixed_params + num_opt_params;
 
     // Total number of args is the first Smi in args descriptor array (R10).
     __ movq(RBX, FieldAddress(R10, Array::data_offset()));
@@ -606,11 +577,12 @@ void CodeGenerator::GenerateEntryCode() {
   // TODO(regis): For now, always unroll the init loop. Decide later above
   // which threshold to implement a loop.
   // Consider emitting pushes instead of moves.
-  for (int index = first_local_index; index > first_free_frame_index; index--) {
-    if (index == first_local_index) {
+  const int base = parsed_function_.first_local_index();
+  for (int index = 0; index < parsed_function_.local_count(); ++index) {
+    if (index == 0) {
       __ movq(RAX, raw_null);
     }
-    __ movq(Address(RBP, index * kWordSize), RAX);
+    __ movq(Address(RBP, (base - index) * kWordSize), RAX);
   }
 
   // Generate stack overflow check.
@@ -751,19 +723,20 @@ void CodeGenerator::VisitAssignableNode(AssignableNode* node) {
 
 void CodeGenerator::VisitClosureNode(ClosureNode* node) {
   const Function& function = node->function();
-  if (function.IsNonImplicitClosureFunction()) {
+  if (function.IsNonImplicitClosureFunction() &&
+      (function.context_scope() == ContextScope::null())) {
     const int current_context_level = state()->context_level();
     const ContextScope& context_scope = ContextScope::ZoneHandle(
         node->scope()->PreserveOuterScope(current_context_level));
     ASSERT(!function.HasCode());
-    ASSERT(function.context_scope() == ContextScope::null());
     function.set_context_scope(context_scope);
   } else {
-    ASSERT(function.context_scope() != ContextScope::null());
     if (function.IsImplicitInstanceClosureFunction()) {
       node->receiver()->Visit(this);
     }
   }
+  ASSERT(function.context_scope() != ContextScope::null());
+
   // The function type of a closure may have type arguments. In that case, pass
   // the type arguments of the instantiator.
   const Class& cls = Class::Handle(function.signature_class());