Class fields, part 3 (backends)

src/full-codegen/full-codegen.cc

Index: src/full-codegen/full-codegen.cc
diff --git a/src/full-codegen/full-codegen.cc b/src/full-codegen/full-codegen.cc
index 6182094e821933230802568745df22e03b9b5872..a5134d9ae06d31d0e94389bc285585250d0cd0af 100644
--- a/src/full-codegen/full-codegen.cc
+++ b/src/full-codegen/full-codegen.cc
@@ -1528,6 +1528,20 @@ void FullCodeGenerator::VisitClassLiteral(ClassLiteral* lit) {
   PrepareForBailoutForId(lit->CreateLiteralId(), BailoutState::TOS_REGISTER);
   PushOperand(result_register());
 
+  // The below proxy exists to allow static field initializers to have the
+  // correct home object and receiver. It's only necessary if the initializers
+  // are called as a part of class definition instead of immediately after it,
+  // in which case they could simply refer to the class just constructed. The
+  // latter is actually what's currently specified, and this will need to be
+  // changed if that behavior is settled upon. See also
+  // https://github.com/tc39/proposal-class-public-fields/issues/50
+  VariableProxy* static_initializer_proxy = lit->static_initializer_proxy();
+  if (static_initializer_proxy != nullptr) {
+    Variable* variable = static_initializer_proxy->var();
+    EmitVariableAssignment(variable, Token::INIT,
+                           FeedbackVectorSlot::Invalid());
+  }
+
   // Load the "prototype" from the constructor.
   __ Move(LoadDescriptor::ReceiverRegister(), result_register());
   __ LoadRoot(LoadDescriptor::NameRegister(), Heap::kprototype_stringRootIndex);