Load global object and builtins from activation.

src/compiler/ast-graph-builder.cc

Index: src/compiler/ast-graph-builder.cc
diff --git a/src/compiler/ast-graph-builder.cc b/src/compiler/ast-graph-builder.cc
index 49a67157c7a96866fbd12045e1070ee59c76aace..c328202fb2f8a2d3d1b3ae53afef086a852fcf25 100644
--- a/src/compiler/ast-graph-builder.cc
+++ b/src/compiler/ast-graph-builder.cc
@@ -6,6 +6,7 @@
 
 #include "src/compiler.h"
 #include "src/compiler/control-builders.h"
+#include "src/compiler/machine-operator.h"
 #include "src/compiler/node-properties.h"
 #include "src/compiler/node-properties-inl.h"
 #include "src/full-codegen.h"
@@ -737,13 +738,12 @@ void AstGraphBuilder::VisitForInStatement(ForInStatement* stmt) {
           test_should_filter.If(should_filter_cond);
           test_should_filter.Then();
           value = environment()->Pop();
-          // TODO(dcarney): Better load from function context.
-          // See comment in BuildLoadBuiltinsObject.
-          Handle<JSFunction> function(JSFunction::cast(
-              info()->context()->builtins()->javascript_builtin(
-                  Builtins::FILTER_KEY)));
+          Node* builtins = BuildLoadBuiltinsObject();
+          Node* function = BuildLoadObjectField(
+              builtins,
+              JSBuiltinsObject::OffsetOfFunctionWithId(Builtins::FILTER_KEY));
           // Callee.
-          environment()->Push(jsgraph()->HeapConstant(function));
+          environment()->Push(function);
           // Receiver.
           environment()->Push(obj);
           // Args.
@@ -875,10 +875,11 @@ void AstGraphBuilder::VisitLiteral(Literal* expr) {
 
 
 void AstGraphBuilder::VisitRegExpLiteral(RegExpLiteral* expr) {
-  Handle<JSFunction> closure = info()->closure();
+  Node* closure = GetFunctionClosure();
 
   // Create node to materialize a regular expression literal.
-  Node* literals_array = jsgraph()->Constant(handle(closure->literals()));
+  Node* literals_array =
+      BuildLoadObjectField(closure, JSFunction::kLiteralsOffset);
   Node* literal_index = jsgraph()->Constant(expr->literal_index());
   Node* pattern = jsgraph()->Constant(expr->pattern());
   Node* flags = jsgraph()->Constant(expr->flags());
@@ -889,11 +890,12 @@ void AstGraphBuilder::VisitRegExpLiteral(RegExpLiteral* expr) {
 
 
 void AstGraphBuilder::VisitObjectLiteral(ObjectLiteral* expr) {
-  Handle<JSFunction> closure = info()->closure();
+  Node* closure = GetFunctionClosure();
 
   // Create node to deep-copy the literal boilerplate.
   expr->BuildConstantProperties(isolate());
-  Node* literals_array = jsgraph()->Constant(handle(closure->literals()));
+  Node* literals_array =
+      BuildLoadObjectField(closure, JSFunction::kLiteralsOffset);
   Node* literal_index = jsgraph()->Constant(expr->literal_index());
   Node* constants = jsgraph()->Constant(expr->constant_properties());
   Node* flags = jsgraph()->Constant(expr->ComputeFlags());
@@ -998,11 +1000,12 @@ void AstGraphBuilder::VisitObjectLiteral(ObjectLiteral* expr) {
 
 
 void AstGraphBuilder::VisitArrayLiteral(ArrayLiteral* expr) {
-  Handle<JSFunction> closure = info()->closure();
+  Node* closure = GetFunctionClosure();
 
   // Create node to deep-copy the literal boilerplate.
   expr->BuildConstantElements(isolate());
-  Node* literals_array = jsgraph()->Constant(handle(closure->literals()));
+  Node* literals_array =
+      BuildLoadObjectField(closure, JSFunction::kLiteralsOffset);
   Node* literal_index = jsgraph()->Constant(expr->literal_index());
   Node* constants = jsgraph()->Constant(expr->constant_elements());
   Node* flags = jsgraph()->Constant(expr->ComputeFlags());
@@ -1933,25 +1936,28 @@ Node* AstGraphBuilder::BuildVariableAssignment(Variable* variable, Node* value,
 }
 
 
+Node* AstGraphBuilder::BuildLoadObjectField(Node* object, int offset) {
+  // TODO(sigurds) Use simplified load here once it is ready.
+  MachineOperatorBuilder machine(zone());
+  Node* field_load = NewNode(machine.Load(kMachAnyTagged), object,
+                             jsgraph_->Int32Constant(offset - kHeapObjectTag));
+  return field_load;
+}
+
+
 Node* AstGraphBuilder::BuildLoadBuiltinsObject() {
-  // TODO(mstarzinger): Better load from function context, otherwise optimized
-  // code cannot be shared across native contexts.
-  return jsgraph()->Constant(handle(info()->context()->builtins()));
+  Node* global = BuildLoadGlobalObject();
+  Node* builtins =
+      BuildLoadObjectField(global, JSGlobalObject::kBuiltinsOffset);
+  return builtins;
 }
 
 
 Node* AstGraphBuilder::BuildLoadGlobalObject() {
-#if 0
   Node* context = GetFunctionContext();
-  // TODO(mstarzinger): Use mid-level operator on FixedArray instead of the
-  // JS-level operator that targets JSObject.
-  Node* index = jsgraph()->Constant(Context::GLOBAL_OBJECT_INDEX);
-  return NewNode(javascript()->LoadProperty(), context, index);
-#else
-  // TODO(mstarzinger): Better load from function context, otherwise optimized
-  // code cannot be shared across native contexts. See unused code above.
-  return jsgraph()->Constant(handle(info()->context()->global_object()));
-#endif
+  Operator* load_op =
+      javascript()->LoadContext(0, Context::GLOBAL_OBJECT_INDEX, true);
+  return NewNode(load_op, context);
 }