Nuke CompareToNull AST node.

src/hydrogen.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 5703 matching lines @@
   if (expr->IsLiteralCompareTypeof(&sub_expr, &check)) {
     HandleLiteralCompareTypeof(expr, sub_expr, check);
     return;
   }
 
   if (expr->IsLiteralCompareUndefined(&sub_expr)) {
     HandleLiteralCompareUndefined(expr, sub_expr);
     return;
   }
 
+  if (expr->IsLiteralCompareNull(&sub_expr)) {
+    HandleLiteralCompareNull(expr, sub_expr);
+    return;
+  }
+
   TypeInfo type_info = oracle()->CompareType(expr);
   // Check if this expression was ever executed according to type feedback.
   if (type_info.IsUninitialized()) {
     AddInstruction(new(zone()) HSoftDeoptimize);
     current_block()->MarkAsDeoptimizing();
     type_info = TypeInfo::Unknown();
   }
 
   CHECK_ALIVE(VisitForValue(expr->left()));
   CHECK_ALIVE(VisitForValue(expr->right()));
@@ skipping 83 matching lines @@
       HCompareIDAndBranch* result =
           new(zone()) HCompareIDAndBranch(left, right, op);
       result->set_position(expr->position());
       result->SetInputRepresentation(r);
       return ast_context()->ReturnControl(result, expr->id());
     }
   }
 }
 
 
-void HGraphBuilder::VisitCompareToNull(CompareToNull* expr) {
+void HGraphBuilder::HandleLiteralCompareNull(CompareOperation* compare_expr,
+                                             Expression* expr) {
   ASSERT(!HasStackOverflow());
   ASSERT(current_block() != NULL);
   ASSERT(current_block()->HasPredecessor());
-  CHECK_ALIVE(VisitForValue(expr->expression()));
+  CHECK_ALIVE(VisitForValue(expr));
   HValue* value = Pop();
-  HIsNullAndBranch* instr =
-      new(zone()) HIsNullAndBranch(value, expr->is_strict());
-  return ast_context()->ReturnControl(instr, expr->id());
+  bool is_strict = compare_expr->op() == Token::EQ_STRICT;
+  HIsNullAndBranch* instr = new(zone()) HIsNullAndBranch(value, is_strict);
+  return ast_context()->ReturnControl(instr, compare_expr->id());
 }
 
 
 void HGraphBuilder::VisitThisFunction(ThisFunction* expr) {
   ASSERT(!HasStackOverflow());
   ASSERT(current_block() != NULL);
   ASSERT(current_block()->HasPredecessor());
   HThisFunction* self = new(zone()) HThisFunction;
   return ast_context()->ReturnInstruction(self, expr->id());
 }
@@ skipping 969 matching lines @@
     }
   }
 
 #ifdef DEBUG
   if (graph_ != NULL) graph_->Verify();
   if (allocator_ != NULL) allocator_->Verify();
 #endif
 }
 
 } }  // namespace v8::internal