[ESNext] Implement DynamicImportCall

src/interpreter/bytecode-generator.cc

Index: src/interpreter/bytecode-generator.cc
diff --git a/src/interpreter/bytecode-generator.cc b/src/interpreter/bytecode-generator.cc
index 052f29367dadd6a4fa1b5fca9948f9ffe4c66a41..6ab002e03e6270ddb26630df446b9855304f32d0 100644
--- a/src/interpreter/bytecode-generator.cc
+++ b/src/interpreter/bytecode-generator.cc
@@ -635,7 +635,9 @@ BytecodeGenerator::BytecodeGenerator(CompilationInfo* info)
       execution_result_(nullptr),
       generator_resume_points_(info->literal()->yield_count(), info->zone()),
       generator_state_(),
-      loop_depth_(0) {
+      loop_depth_(0),
+      source_url_entry_(0),
+      has_source_url_entry_(false) {
   DCHECK_EQ(closure_scope(), closure_scope()->GetClosureScope());
 }
 
@@ -696,6 +698,11 @@ void BytecodeGenerator::AllocateDeferredConstants(Isolate* isolate) {
         array_literal->GetOrBuildConstantElements(isolate);
     builder()->SetDeferredConstantPoolEntry(literal.second, constant_elements);
   }
+
+  if (has_source_url_entry()) {
+    Handle<String> url(String::cast(info()->script()->name()));
+    builder()->SetDeferredConstantPoolEntry(source_url_entry(), url);
+  }
 }
 
 void BytecodeGenerator::GenerateBytecode(uintptr_t stack_limit) {
@@ -3003,6 +3010,23 @@ void BytecodeGenerator::VisitEmptyParentheses(EmptyParentheses* expr) {
   UNREACHABLE();
 }
 
+void BytecodeGenerator::VisitImportCallExpression(ImportCallExpression* expr) {
+  size_t entry;
+  if (has_source_url_entry()) {
+    entry = source_url_entry();
+  } else {
+    entry = builder()->AllocateDeferredConstantPoolEntry();

[rmcilroy, 2017/03/16 09:12:38]

Instead of storing this seperately, could you just pass the JSFunction
(Register::function_closure()) to the runtime call and load the script name off
the SharedFunctionInfo?

[gsathya, 2017/03/17 00:47:22]

Done.

+    set_source_url_entry(entry);
+  }
+
+  RegisterList args = register_allocator()->NewRegisterList(2);
+  VisitForRegisterValue(expr->argument(), args[1]);
+  builder()
+      ->LoadConstantPoolEntry(entry)
+      .StoreAccumulatorInRegister(args[0])
+      .CallRuntime(Runtime::kDynamicImportCall, args);
+}
+
 void BytecodeGenerator::VisitGetIterator(GetIterator* expr) {
   FeedbackSlot load_slot = expr->IteratorPropertyFeedbackSlot();
   FeedbackSlot call_slot = expr->IteratorCallFeedbackSlot();