[modules] Introduce new VariableLocation for module imports/exports.

src/compiler/ast-graph-builder.cc

 // Copyright 2014 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/compiler/ast-graph-builder.h"
 
 #include "src/ast/scopes.h"
 #include "src/compiler.h"
 #include "src/compiler/ast-loop-assignment-analyzer.h"
 #include "src/compiler/control-builders.h"
@@ skipping 1167 matching lines @@
       }
       break;
     case VariableLocation::LOOKUP: {
       DCHECK(!hole_init);
       Node* name = jsgraph()->Constant(variable->name());
       const Operator* op = javascript()->CallRuntime(Runtime::kDeclareEvalVar);
       Node* store = NewNode(op, name);
       PrepareFrameState(store, decl->proxy()->id());
       break;
     }
+    case VariableLocation::MODULE:
+      UNREACHABLE();
   }
 }
 
 
 void AstGraphBuilder::VisitFunctionDeclaration(FunctionDeclaration* decl) {
   Variable* variable = decl->proxy()->var();
   switch (variable->location()) {
     case VariableLocation::GLOBAL:
     case VariableLocation::UNALLOCATED: {
       Handle<SharedFunctionInfo> function = Compiler::GetSharedFunctionInfo(
@@ skipping 23 matching lines @@
     case VariableLocation::LOOKUP: {
       VisitForValue(decl->fun());
       Node* value = environment()->Pop();
       Node* name = jsgraph()->Constant(variable->name());
       const Operator* op =
           javascript()->CallRuntime(Runtime::kDeclareEvalFunction);
       Node* store = NewNode(op, name, value);
       PrepareFrameState(store, decl->proxy()->id());
       break;
     }
+    case VariableLocation::MODULE:
+      UNREACHABLE();
   }
 }
 
 
 void AstGraphBuilder::VisitBlock(Block* stmt) {
   BlockBuilder block(this);
   ControlScopeForBreakable scope(this, stmt, &block);
   if (stmt->labels() != nullptr) block.BeginBlock();
   if (stmt->scope() == nullptr) {
     // Visit statements in the same scope, no declarations.
@@ skipping 2197 matching lines @@
       // Dynamic lookup of context variable (anywhere in the chain).
       Handle<String> name = variable->name();
       if (Node* node = TryLoadDynamicVariable(variable, name, bailout_id,
                                               feedback, combine, typeof_mode)) {
         return node;
       }
       Node* value = BuildDynamicLoad(name, typeof_mode);
       PrepareFrameState(value, bailout_id, combine);
       return value;
     }
+    case VariableLocation::MODULE:
+      UNREACHABLE();
   }
   UNREACHABLE();
   return nullptr;
 }
 
 
 Node* AstGraphBuilder::BuildVariableDelete(Variable* variable,
                                            BailoutId bailout_id,
                                            OutputFrameStateCombine combine) {
   switch (variable->location()) {
@@ skipping 15 matching lines @@
     }
     case VariableLocation::LOOKUP: {
       // Dynamic lookup of context variable (anywhere in the chain).
       Node* name = jsgraph()->Constant(variable->name());
       const Operator* op =
           javascript()->CallRuntime(Runtime::kDeleteLookupSlot);
       Node* result = NewNode(op, name);
       PrepareFrameState(result, bailout_id, combine);
       return result;
     }
+    case VariableLocation::MODULE:
+      UNREACHABLE();
   }
   UNREACHABLE();
   return nullptr;
 }
 
 Node* AstGraphBuilder::BuildVariableAssignment(
     Variable* variable, Node* value, Token::Value op,
     const VectorSlotPair& feedback, BailoutId bailout_id,
     OutputFrameStateCombine combine) {
   Node* the_hole = jsgraph()->TheHoleConstant();
@@ skipping 90 matching lines @@
       const Operator* op = javascript()->StoreContext(depth, variable->index());
       return NewNode(op, current_context(), value);
     }
     case VariableLocation::LOOKUP: {
       // Dynamic lookup of context variable (anywhere in the chain).
       Handle<Name> name = variable->name();
       Node* store = BuildDynamicStore(name, value);
       PrepareFrameState(store, bailout_id, combine);
       return store;
     }
+    case VariableLocation::MODULE:
+      UNREACHABLE();
   }
   UNREACHABLE();
   return nullptr;
 }
 
 
 Node* AstGraphBuilder::BuildKeyedLoad(Node* object, Node* key,
                                       const VectorSlotPair& feedback) {
   const Operator* op = javascript()->LoadProperty(feedback);
   Node* node = NewNode(op, object, key, GetFunctionClosure());
@@ skipping 787 matching lines @@
     // Phi does not exist yet, introduce one.
     value = NewPhi(inputs, value, control);
     value->ReplaceInput(inputs - 1, other);
   }
   return value;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8