[fullcodegen] Implement control flow across do-expressions.

src/full-codegen/arm64/full-codegen-arm64.cc

Index: src/full-codegen/arm64/full-codegen-arm64.cc
diff --git a/src/full-codegen/arm64/full-codegen-arm64.cc b/src/full-codegen/arm64/full-codegen-arm64.cc
index 169cb07da8c0797c79ee94f19a1f3efaf9cde9f3..ad5cd8a1d185d5196703d027d2f2811580de845f 100644
--- a/src/full-codegen/arm64/full-codegen-arm64.cc
+++ b/src/full-codegen/arm64/full-codegen-arm64.cc
@@ -997,14 +997,14 @@ void FullCodeGenerator::VisitForInStatement(ForInStatement* stmt) {
 
   // TODO(all): This visitor probably needs better comments and a revisit.
 
-  Label loop, exit;
-  ForIn loop_statement(this, stmt);
-  increment_loop_depth();
-
   // Get the object to enumerate over.
   SetExpressionAsStatementPosition(stmt->enumerable());
   VisitForAccumulatorValue(stmt->enumerable());
-  OperandStackDepthIncrement(ForIn::kElementCount);
+  OperandStackDepthIncrement(5);
+
+  Label loop, exit;
+  Iteration loop_statement(this, stmt);
+  increment_loop_depth();
 
   // If the object is null or undefined, skip over the loop, otherwise convert
   // it to a JS receiver.  See ECMA-262 version 5, section 12.6.4.
@@ -3874,7 +3874,7 @@ void FullCodeGenerator::VisitYield(Yield* expr) {
     case Yield::kSuspend:
       // Pop value from top-of-stack slot; box result into result register.
       EmitCreateIteratorResult(false);
-      __ Push(result_register());
+      PushOperand(result_register());
       // Fall through.
     case Yield::kInitial: {
       Label suspend, continuation, post_runtime, resume;
@@ -3896,6 +3896,7 @@ void FullCodeGenerator::VisitYield(Yield* expr) {
       EmitUnwindAndReturn();
 
       __ Bind(&suspend);
+      OperandStackDepthIncrement(1);  // Not popped on this path.
       VisitForAccumulatorValue(expr->generator_object());
       DCHECK((continuation.pos() > 0) && Smi::IsValid(continuation.pos()));
       __ Mov(x1, Smi::FromInt(continuation.pos()));
@@ -3921,7 +3922,6 @@ void FullCodeGenerator::VisitYield(Yield* expr) {
 
     case Yield::kFinal: {
       // Pop value from top-of-stack slot, box result into result register.
-      OperandStackDepthDecrement(1);
       EmitCreateIteratorResult(true);
       EmitUnwindAndReturn();
       break;
@@ -4079,7 +4079,7 @@ void FullCodeGenerator::EmitCreateIteratorResult(bool done) {
   Register empty_fixed_array = x4;
   Register untagged_result = x5;
   __ LoadNativeContextSlot(Context::ITERATOR_RESULT_MAP_INDEX, map_reg);
-  __ Pop(result_value);
+  PopOperand(result_value);
   __ LoadRoot(boolean_done,
               done ? Heap::kTrueValueRootIndex : Heap::kFalseValueRootIndex);
   __ LoadRoot(empty_fixed_array, Heap::kEmptyFixedArrayRootIndex);