Hydrogen support for context allocated harmony bindings.

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 3267 matching lines @@
       if (value == graph()->GetConstantHole()) {
         ASSERT(variable->mode() == CONST ||
                variable->mode() == CONST_HARMONY ||
                variable->mode() == LET);
         return Bailout("reference to uninitialized variable");
       }
       return ast_context()->ReturnValue(value);
     }
 
     case Variable::CONTEXT: {
-      if (variable->mode() == LET || variable->mode() == CONST_HARMONY) {
-        return Bailout("reference to harmony declared context slot");
-      }
       if (variable->mode() == CONST) {
         return Bailout("reference to const context slot");
       }
       HValue* context = BuildContextChainWalk(variable);
-      HLoadContextSlot* instr =
-          new(zone()) HLoadContextSlot(context, variable->index());
+      HLoadContextSlot* instr = new(zone()) HLoadContextSlot(context, variable);
       return ast_context()->ReturnInstruction(instr, expr->id());
     }
 
     case Variable::LOOKUP:
       return Bailout("reference to a variable which requires dynamic lookup");
   }
 }
 
 
 void HGraphBuilder::VisitLiteral(Literal* expr) {
@@ skipping 532 matching lines @@
           int count = info()->scope()->num_parameters();
           for (int i = 0; i < count; ++i) {
             if (var == info()->scope()->parameter(i)) {
               Bailout(
                   "assignment to parameter, function uses arguments object");
             }
           }
         }
 
         HValue* context = BuildContextChainWalk(var);
-        HStoreContextSlot* instr =
-            new(zone()) HStoreContextSlot(context, var->index(), Top());
+        HStoreContextSlot* instr = new(zone()) HStoreContextSlot(
+            context, var, HStoreContextSlot::kAssign, Top());
         AddInstruction(instr);
         if (instr->HasObservableSideEffects()) {
           AddSimulate(expr->AssignmentId());
         }
         break;
       }
 
       case Variable::LOOKUP:
         return Bailout("compound assignment to lookup slot");
     }
@@ skipping 99 matching lines @@
       if (expr->op() != Token::INIT_CONST) {
         return Bailout("non-initializer assignment to const");
       }
       if (!var->IsStackAllocated()) {
         return Bailout("assignment to const context slot");
       }
       // We insert a use of the old value to detect unsupported uses of const
       // variables (e.g. initialization inside a loop).
       HValue* old_value = environment()->Lookup(var);
       AddInstruction(new HUseConst(old_value));
-    } else if (var->mode() == LET) {
-      if (!var->IsStackAllocated()) {
-        return Bailout("assignment to let context slot");
-      }
     } else if (var->mode() == CONST_HARMONY) {
       if (expr->op() != Token::INIT_CONST_HARMONY) {
         return Bailout("non-initializer assignment to const");
       }
-      if (!var->IsStackAllocated()) {
-        return Bailout("assignment to const context slot");
-      }
     }
 
     if (proxy->IsArguments()) return Bailout("assignment to arguments");
 
     // Handle the assignment.
     switch (var->location()) {
       case Variable::UNALLOCATED:
         CHECK_ALIVE(VisitForValue(expr->value()));
         HandleGlobalVariableAssignment(var,
                                        Top(),
@@ skipping 31 matching lines @@
           int count = info()->scope()->num_parameters();
           for (int i = 0; i < count; ++i) {
             if (var == info()->scope()->parameter(i)) {
               return Bailout("assignment to parameter in arguments object");
             }
           }
         }
 
         CHECK_ALIVE(VisitForValue(expr->value()));
         HValue* context = BuildContextChainWalk(var);
+        HStoreContextSlot::Mode mode = (expr->op() == Token::ASSIGN)
+            ? HStoreContextSlot::kAssign : HStoreContextSlot::kInitialize;
         HStoreContextSlot* instr =
-            new(zone()) HStoreContextSlot(context, var->index(), Top());
+            new(zone()) HStoreContextSlot(context, var, mode, Top());
         AddInstruction(instr);
         if (instr->HasObservableSideEffects()) {
           AddSimulate(expr->AssignmentId());
         }
         return ast_context()->ReturnValue(Pop());
       }
 
       case Variable::LOOKUP:
         return Bailout("assignment to LOOKUP variable");
     }
@@ skipping 1588 matching lines @@
           // linear search of the parameter list.
           int count = info()->scope()->num_parameters();
           for (int i = 0; i < count; ++i) {
             if (var == info()->scope()->parameter(i)) {
               return Bailout("assignment to parameter in arguments object");
             }
           }
         }
 
         HValue* context = BuildContextChainWalk(var);
-        HStoreContextSlot* instr =
-            new(zone()) HStoreContextSlot(context, var->index(), after);
+        HStoreContextSlot* instr = new(zone()) HStoreContextSlot(
+            context, var, HStoreContextSlot::kAssign, after);
         AddInstruction(instr);
         if (instr->HasObservableSideEffects()) {
           AddSimulate(expr->AssignmentId());
         }
         break;
       }
 
       case Variable::LOOKUP:
         return Bailout("lookup variable in count operation");
     }
@@ skipping 571 matching lines @@
       if (binding_needs_init || function != NULL) {
         HValue* value = NULL;
         if (function != NULL) {
           VisitForValue(function);
           value = Pop();
         } else {
           value = graph()->GetConstantHole();
         }
         if (var->IsContextSlot()) {
           HValue* context = environment()->LookupContext();
-          HStoreContextSlot* store =
-              new HStoreContextSlot(context, var->index(), value);
+          HStoreContextSlot* store = new HStoreContextSlot(
+              context, var, HStoreContextSlot::kInitialize, value);
           AddInstruction(store);
           if (store->HasObservableSideEffects()) AddSimulate(proxy->id());
         } else {
           environment()->Bind(var, value);
         }
       }
       break;
     case Variable::LOOKUP:
       return Bailout("unsupported lookup slot in declaration");
   }
@@ skipping 1001 matching lines @@
     }
   }
 
 #ifdef DEBUG
   if (graph_ != NULL) graph_->Verify(false);  // No full verify.
   if (allocator_ != NULL) allocator_->Verify();
 #endif
 }
 
 } }  // namespace v8::internal