[ignition,modules] Introduce bytecodes for loading/storing module variables.

src/compiler/bytecode-graph-builder.cc

Index: src/compiler/bytecode-graph-builder.cc
diff --git a/src/compiler/bytecode-graph-builder.cc b/src/compiler/bytecode-graph-builder.cc
index 6f7b374a7599eae1e15008d684b5c0b6fd0f02af..a0fe23b9c480a2382fa15cacea62a53ee5022d9d 100644
--- a/src/compiler/bytecode-graph-builder.cc
+++ b/src/compiler/bytecode-graph-builder.cc
@@ -1132,6 +1132,25 @@ void BytecodeGraphBuilder::VisitStaKeyedPropertyStrict() {
   BuildKeyedStore(LanguageMode::STRICT);
 }
 
+void BytecodeGraphBuilder::VisitLdaModuleVariable() {
+  // TODO(neis): Don't call the runtime.

[Benedikt Meurer, 2016/11/04 16:45:59]

So next step is to introduce JSLoadModuleVariable and JSStoreModuleVariable,
backed by these runtime calls? And then add typed lowering to
LoadElement/StoreElement?

+  PrepareEagerCheckpoint();
+  Node* index = jsgraph()->Constant(bytecode_iterator().GetImmediateOperand(0));
+  const Operator* op = javascript()->CallRuntime(Runtime::kLoadModuleVariable);
+  Node* value = NewNode(op, index);
+  environment()->BindAccumulator(value, Environment::kAttachFrameState);
+}
+
+void BytecodeGraphBuilder::VisitStaModuleVariable() {
+  // TODO(neis): Don't call the runtime.
+  PrepareEagerCheckpoint();
+  Node* index = jsgraph()->Constant(bytecode_iterator().GetImmediateOperand(0));
+  Node* value = environment()->LookupAccumulator();
+  const Operator* op = javascript()->CallRuntime(Runtime::kStoreModuleVariable);
+  Node* store = NewNode(op, index, value);
+  environment()->RecordAfterState(store, Environment::kAttachFrameState);
+}
+
 void BytecodeGraphBuilder::VisitPushContext() {
   Node* new_context = environment()->LookupAccumulator();
   environment()->BindRegister(bytecode_iterator().GetRegisterOperand(0),