Remove CONST_LEGACY VariableMode

src/interpreter/bytecode-generator.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/interpreter/bytecode-generator.h"
 
 #include "src/ast/scopes.h"
 #include "src/code-stubs.h"
 #include "src/compiler.h"
 #include "src/interpreter/bytecode-flags.h"
@@ skipping 1994 matching lines @@
   builder()
       ->JumpIfNotHole(&reference_error)
       .Jump(&no_reference_error)
       .Bind(&reference_error);
   BuildThrowReferenceError(name);
   builder()->Bind(&no_reference_error);
 }
 
 void BytecodeGenerator::BuildHoleCheckForVariableAssignment(Variable* variable,
                                                             Token::Value op) {
-  DCHECK(variable->mode() != CONST_LEGACY);
   if (op != Token::INIT) {
     // Perform an initialization check for let/const declared variables.
     // E.g. let x = (x = 20); is not allowed.
     BuildThrowIfHole(variable->name());
   } else {
     DCHECK(variable->is_this() && variable->mode() == CONST &&
            op == Token::INIT);
     // Perform an initialization check for 'this'. 'this' variable is the
     // only variable able to trigger bind operations outside the TDZ
     // via 'super' calls.
@@ skipping 25 matching lines @@
         // Load destination to check for hole.
         Register value_temp = register_allocator()->NewRegister();
         builder()
             ->StoreAccumulatorInRegister(value_temp)
             .LoadAccumulatorWithRegister(destination);
 
         BuildHoleCheckForVariableAssignment(variable, op);
         builder()->LoadAccumulatorWithRegister(value_temp);
       }
 
-      if ((mode == CONST || mode == CONST_LEGACY) && op != Token::INIT) {
-        if (mode == CONST || is_strict(language_mode())) {
-          builder()->CallRuntime(Runtime::kThrowConstAssignError, Register(),
-                                 0);
-        }
-        // Non-initializing assignments to legacy constants are ignored
-        // in sloppy mode. Break here to avoid storing into variable.
-        break;
+      if (mode != CONST || op == Token::INIT) {
+        builder()->StoreAccumulatorInRegister(destination);
+      } else if (variable->throw_on_const_assignment(language_mode())) {
+        builder()->CallRuntime(Runtime::kThrowConstAssignError, Register(), 0);
       }
-
-      builder()->StoreAccumulatorInRegister(destination);
       break;
     }
     case VariableLocation::GLOBAL:
     case VariableLocation::UNALLOCATED: {
       builder()->StoreGlobal(variable->name(), feedback_index(slot),
                              language_mode());
       break;
     }
     case VariableLocation::CONTEXT: {
       int depth = execution_context()->ContextChainDepth(variable->scope());
@@ skipping 26 matching lines @@
         // Load destination to check for hole.
         Register value_temp = register_allocator()->NewRegister();
         builder()
             ->StoreAccumulatorInRegister(value_temp)
             .LoadContextSlot(context_reg, variable->index());
 
         BuildHoleCheckForVariableAssignment(variable, op);
         builder()->LoadAccumulatorWithRegister(value_temp);
       }
 
-      if ((mode == CONST || mode == CONST_LEGACY) && op != Token::INIT) {
-        if (mode == CONST || is_strict(language_mode())) {
-          builder()->CallRuntime(Runtime::kThrowConstAssignError, Register(),
-                                 0);
-        }
-        // Non-initializing assignments to legacy constants are ignored
-        // in sloppy mode. Break here to avoid storing into variable.
-        break;
+      if (mode != CONST || op == Token::INIT) {
+        builder()->StoreContextSlot(context_reg, variable->index());
+      } else if (variable->throw_on_const_assignment(language_mode())) {
+        builder()->CallRuntime(Runtime::kThrowConstAssignError, Register(), 0);
       }
-
-      builder()->StoreContextSlot(context_reg, variable->index());
       break;
     }
     case VariableLocation::LOOKUP: {
-      DCHECK_NE(CONST_LEGACY, variable->mode());
       builder()->StoreLookupSlot(variable->name(), language_mode());
       break;
     }
     case VariableLocation::MODULE:
       UNREACHABLE();
   }
 }
 
 void BytecodeGenerator::VisitAssignment(Assignment* expr) {
   DCHECK(expr->target()->IsValidReferenceExpressionOrThis());
@@ skipping 1142 matching lines @@
   return execution_context()->scope()->language_mode();
 }
 
 int BytecodeGenerator::feedback_index(FeedbackVectorSlot slot) const {
   return TypeFeedbackVector::GetIndex(slot);
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8