[ast] Remove unused DoExpression

Change-Id: Iebdf095600186988abd7b1f13a1a2d9f566e5d7c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2049845
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Auto-Submit: Toon Verwaest <verwaest@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#66216}

src/ast/ast-traversal-visitor.h

@@ -294,13 +294,6 @@ void AstTraversalVisitor<Subclass>::VisitNativeFunctionLiteral(
   PROCESS_EXPRESSION(expr);
 }
 
-template <class Subclass>
-void AstTraversalVisitor<Subclass>::VisitDoExpression(DoExpression* expr) {
-  PROCESS_EXPRESSION(expr);
-  RECURSE(VisitBlock(expr->block()));
-  RECURSE(VisitVariableProxy(expr->result()));
-}
-
 template <class Subclass>
 void AstTraversalVisitor<Subclass>::VisitConditional(Conditional* expr) {
   PROCESS_EXPRESSION(expr);

src/ast/ast.h

@@ -89,7 +89,6 @@ namespace internal {
   V(CompoundAssignment)         \
   V(Conditional)                \
   V(CountOperation)             \
-  V(DoExpression)               \
   V(EmptyParentheses)           \
   V(FunctionLiteral)            \
   V(GetTemplateObject)          \
@@ -411,25 +410,6 @@ inline ZonePtrList<const AstRawString>* Block::labels() const {
   return nullptr;
 }
 
-class DoExpression final : public Expression {
- public:
-  Block* block() { return block_; }
-  VariableProxy* result() { return result_; }
-
- private:
-  friend class AstNodeFactory;
-
-  DoExpression(Block* block, VariableProxy* result, int pos)
-      : Expression(pos, kDoExpression), block_(block), result_(result) {
-    DCHECK_NOT_NULL(block_);
-    DCHECK_NOT_NULL(result_);
-  }
-
-  Block* block_;
-  VariableProxy* result_;
-};
-
-
 class Declaration : public AstNode {
  public:
   using List = base::ThreadedList<Declaration>;
@@ -3303,11 +3283,6 @@ class AstNodeFactory final {
     return new (zone_) NativeFunctionLiteral(name, extension, pos);
   }
 
-  DoExpression* NewDoExpression(Block* block, Variable* result_var, int pos) {
-    VariableProxy* result = NewVariableProxy(result_var, pos);
-    return new (zone_) DoExpression(block, result, pos);
-  }
-
   SuperPropertyReference* NewSuperPropertyReference(Expression* home_object,
                                                     int pos) {
     return new (zone_) SuperPropertyReference(home_object, pos);

src/ast/prettyprinter.cc

@@ -238,9 +238,6 @@ void CallPrinter::VisitInitializeClassMembersStatement(
 void CallPrinter::VisitNativeFunctionLiteral(NativeFunctionLiteral* node) {}
 
 
-void CallPrinter::VisitDoExpression(DoExpression* node) { Find(node->block()); }
-
-
 void CallPrinter::VisitConditional(Conditional* node) {
   Find(node->condition());
   Find(node->then_expression());
@@ -1179,12 +1176,6 @@ void AstPrinter::VisitNativeFunctionLiteral(NativeFunctionLiteral* node) {
 }
 
 
-void AstPrinter::VisitDoExpression(DoExpression* node) {
-  IndentedScope indent(this, "DO EXPRESSION", node->position());
-  PrintStatements(node->block()->statements());
-}
-
-
 void AstPrinter::VisitConditional(Conditional* node) {
   IndentedScope indent(this, "CONDITIONAL", node->position());
   PrintIndentedVisit("CONDITION", node->condition());

src/interpreter/bytecode-generator.cc

@@ -2456,11 +2456,6 @@ void BytecodeGenerator::VisitNativeFunctionLiteral(
   native_function_literals_.push_back(std::make_pair(expr, entry));
 }
 
-void BytecodeGenerator::VisitDoExpression(DoExpression* expr) {
-  VisitBlock(expr->block());
-  VisitVariableProxy(expr->result());
-}
-
 void BytecodeGenerator::VisitConditional(Conditional* expr) {
   ConditionalControlFlowBuilder conditional_builder(
       builder(), block_coverage_builder_, expr);