[Interpreter] Add support for global declarations and load/store of global variables

src/interpreter/bytecode-array-builder.cc

Index: src/interpreter/bytecode-array-builder.cc
diff --git a/src/interpreter/bytecode-array-builder.cc b/src/interpreter/bytecode-array-builder.cc
index 78b5e1e76927762f6309150af6886b866669bf1b..75f0afcdac51d7e307ad4573789d3ddaf43768f2 100644
--- a/src/interpreter/bytecode-array-builder.cc
+++ b/src/interpreter/bytecode-array-builder.cc
@@ -223,6 +223,35 @@ BytecodeArrayBuilder& BytecodeArrayBuilder::LoadGlobal(int slot_index) {
   return *this;
 }
 
+
+BytecodeArrayBuilder& BytecodeArrayBuilder::StoreGlobal(
+    int slot_index, LanguageMode language_mode) {
+  if (!is_sloppy(language_mode)) {
+    UNIMPLEMENTED();
+  }
+  DCHECK(slot_index >= 0);
+  if (FitsInIdxOperand(slot_index)) {
+    Output(Bytecode::kStaGlobal, static_cast<uint8_t>(slot_index));
+  } else {
+    UNIMPLEMENTED();
+  }
+  return *this;
+}
+
+
+BytecodeArrayBuilder& BytecodeArrayBuilder::LoadContextSlot(Register context,
+                                                            int slot_index) {
+  DCHECK(slot_index >= 0);
+  if (FitsInIdxOperand(slot_index)) {
+    Output(Bytecode::kLdaContextSlot, context.ToOperand(),
+           static_cast<uint8_t>(slot_index));
+  } else {
+    UNIMPLEMENTED();
+  }
+  return *this;
+}
+
+
 BytecodeArrayBuilder& BytecodeArrayBuilder::LoadNamedProperty(
     Register object, int feedback_slot, LanguageMode language_mode) {
   if (!is_sloppy(language_mode)) {
@@ -535,7 +564,9 @@ bool BytecodeArrayBuilder::OperandIsValid(Bytecode bytecode, int operand_index,
       return static_cast<uint8_t>(operand_value) == operand_value;
     case OperandType::kReg: {
       Register reg = Register::FromOperand(static_cast<uint8_t>(operand_value));
-      if (reg.is_parameter()) {
+      if (reg.is_function_context()) {
+        return true;
+      } else if (reg.is_parameter()) {
         int parameter_index = reg.ToParameterIndex(parameter_count_);
         return parameter_index >= 0 && parameter_index < parameter_count_;
       } else {