Add SemanticVisitor to dart2js.

pkg/compiler/lib/src/resolution/send_resolver.dart

+// Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+part of dart2js.semantics_visitor;
+
+enum SendStructureKind {
+  GET,
+  SET,
+  INVOKE,
+  UNARY,
+  NOT,
+  BINARY,
+  EQ,
+  NOT_EQ,
+  COMPOUND,
+  INDEX_SET,
+  COMPOUND_INDEX_SET,
+  PREFIX,
+  POSTFIX,
+}
+
+abstract class SendResolverMixin {
+  TreeElements get elements;
+
+  internalError(Spannable spannable, String message);
+
+  AccessSemantics handleStaticallyResolvedAccess(Send node,
+                                                 Element element,
+                                                 Element getter) {
+    if (element.isErroneous) {
+      return new StaticAccess.unresolved(element);
+    } else if (element.isParameter) {
+      return new StaticAccess.parameter(element);
+    } else if (element.isLocal) {
+      if (element.isFunction) {
+        return new StaticAccess.localFunction(element);
+      } else {
+        return new StaticAccess.localVariable(element);
+      }
+    } else if (element.isStatic) {
+      if (element.isField) {
+        return new StaticAccess.staticField(element);
+      } else if (element.isGetter) {
+        return new StaticAccess.staticGetter(element);
+      } else if (element.isSetter) {
+        if (getter != null) {
+          CompoundAccessKind accessKind;
+          if (getter.isGetter) {
+            accessKind = CompoundAccessKind.STATIC_GETTER_SETTER;
+          } else {
+            accessKind = CompoundAccessKind.STATIC_METHOD_SETTER;
+          }
+          return new CompoundAccessSemantics(
+              accessKind, getter, element);
+        } else {
+          return new StaticAccess.staticSetter(element);
+        }
+      } else {
+        return new StaticAccess.staticMethod(element);
+      }
+    } else if (element.isTopLevel) {
+      if (element.isField) {
+        return new StaticAccess.topLevelField(element);
+      } else if (element.isGetter) {
+        return new StaticAccess.topLevelGetter(element);
+      } else if (element.isSetter) {
+        if (getter != null) {
+          CompoundAccessKind accessKind;
+          if (getter.isGetter) {
+            accessKind = CompoundAccessKind.TOPLEVEL_GETTER_SETTER;
+          } else {
+            accessKind = CompoundAccessKind.TOPLEVEL_METHOD_SETTER;
+          }
+          return new CompoundAccessSemantics(
+              accessKind, getter, element);
+        } else {
+          return new StaticAccess.topLevelSetter(element);
+        }
+      } else {
+        return new StaticAccess.topLevelMethod(element);
+      }
+    } else {
+      return internalError(
+          node, "Unhandled resolved property access: $element");
+    }
+  }
+
+  SendStructure computeSendStructure(Send node) {
+    if (elements.isAssert(node)) {
+      if (!node.arguments.isEmpty && node.arguments.tail.isEmpty) {
+        return const AssertStructure();
+      } else {
+        return const InvalidAssertStructure();
+      }
+    }
+
+    AssignmentOperator assignmentOperator;
+    UnaryOperator unaryOperator;
+    BinaryOperator binaryOperator;
+    IncDecOperator incDecOperator;
+
+    if (node.isOperator) {
+      String operatorText = node.selector.asOperator().source;
+      if (operatorText == 'is') {
+        if (node.isIsNotCheck) {
+          return new IsNotStructure(
+              elements.getType(node.arguments.single.asSend().receiver));
+        } else {
+          return new IsStructure(elements.getType(node.arguments.single));
+        }
+      } else if (operatorText == 'as') {
+        return new AsStructure(elements.getType(node.arguments.single));
+      } else if (operatorText == '&&') {
+        return const LogicalAndStructure();
+      } else if (operatorText == '||') {
+        return const LogicalOrStructure();
+      }
+    }
+
+    SendStructureKind kind;
+
+    if (node.asSendSet() != null) {
+      SendSet sendSet = node.asSendSet();
+      String operatorText = sendSet.assignmentOperator.source;
+      if (sendSet.isPrefix || sendSet.isPostfix) {
+        kind = sendSet.isPrefix
+            ? SendStructureKind.PREFIX
+            : SendStructureKind.POSTFIX;
+        incDecOperator = IncDecOperator.parse(operatorText);
+        if (incDecOperator == null) {
+          return internalError(
+              node, "No inc/dec operator for '$operatorText'.");
+        }
+      } else {
+        assignmentOperator = AssignmentOperator.parse(operatorText);
+        if (assignmentOperator != null) {
+          switch (assignmentOperator.kind) {
+            case AssignmentOperatorKind.ASSIGN:
+              kind = SendStructureKind.SET;
+              break;
+            default:
+              kind = SendStructureKind.COMPOUND;
+          }
+        } else {
+          return internalError(
+              node, "No assignment operator for '$operatorText'.");
+        }
+      }
+    } else if (!node.isPropertyAccess) {
+      kind = SendStructureKind.INVOKE;
+    } else {
+      kind = SendStructureKind.GET;
+    }
+
+    if (node.isOperator) {
+      String operatorText = node.selector.asOperator().source;
+      if (node.arguments.isEmpty) {
+        unaryOperator = UnaryOperator.parse(operatorText);
+        if (unaryOperator != null) {
+          switch (unaryOperator.kind) {
+            case UnaryOperatorKind.NOT:
+              kind = SendStructureKind.NOT;
+              break;
+            default:
+              kind = SendStructureKind.UNARY;
+              break;
+          }
+        } else {
+          return const InvalidUnaryStructure();
+        }
+      } else {
+        binaryOperator = BinaryOperator.parse(operatorText);
+        if (binaryOperator != null) {
+          switch (binaryOperator.kind) {
+            case BinaryOperatorKind.EQ:
+              kind = SendStructureKind.EQ;
+              break;
+            case BinaryOperatorKind.NOT_EQ:
+              if (node.isSuperCall) {
+                // `super != foo` is a compile-time error.
+                return const InvalidBinaryStructure();
+              }
+              kind = SendStructureKind.NOT_EQ;
+              break;
+            case BinaryOperatorKind.INDEX:
+              if (node.arguments.tail.isEmpty) {
+                // a[b]
+                kind = SendStructureKind.BINARY;
+              } else {
+                if (kind == SendStructureKind.COMPOUND) {
+                  // a[b] += c
+                  kind = SendStructureKind.COMPOUND_INDEX_SET;
+                } else {
+                  // a[b] = c
+                  kind = SendStructureKind.INDEX_SET;
+                }
+              }
+              break;
+            default:
+              kind = SendStructureKind.BINARY;
+              break;
+          }
+        } else {
+          return const InvalidBinaryStructure();
+        }
+      }
+    }
+    AccessSemantics semantics = computeAccessSemantics(
+        node,
+        isGetOrSet: kind == SendStructureKind.GET ||
+                    kind == SendStructureKind.SET,
+        isInvoke: kind == SendStructureKind.INVOKE,
+        isCompound: kind == SendStructureKind.COMPOUND ||
+                    kind == SendStructureKind.COMPOUND_INDEX_SET ||
+                    kind == SendStructureKind.PREFIX ||
+                    kind == SendStructureKind.POSTFIX);
+    if (semantics == null) {
+      return internalError(node, 'No semantics for $node');
+    }
+    Selector selector = elements.getSelector(node);
+    switch (kind) {
+      case SendStructureKind.GET:
+        return new GetStructure(semantics, selector);
+      case SendStructureKind.SET:
+        return new SetStructure(semantics, selector);
+      case SendStructureKind.INVOKE:
+        return new InvokeStructure(semantics, selector);
+      case SendStructureKind.UNARY:
+        return new UnaryStructure(semantics, unaryOperator, selector);
+      case SendStructureKind.NOT:
+        assert(selector == null);
+        return new NotStructure(semantics, selector);
+      case SendStructureKind.BINARY:
+        return new BinaryStructure(semantics, binaryOperator, selector);
+      case SendStructureKind.EQ:
+        return new EqualsStructure(semantics, selector);
+      case SendStructureKind.NOT_EQ:
+        return new NotEqualsStructure(semantics, selector);
+      case SendStructureKind.COMPOUND:
+        Selector getterSelector =
+            elements.getGetterSelectorInComplexSendSet(node);
+        return new CompoundStructure(
+            semantics,
+            assignmentOperator,
+            getterSelector,
+            selector);
+      case SendStructureKind.INDEX_SET:
+        return new IndexSetStructure(semantics, selector);
+      case SendStructureKind.COMPOUND_INDEX_SET:
+        Selector getterSelector =
+            elements.getGetterSelectorInComplexSendSet(node);
+        return new CompoundIndexSetStructure(
+            semantics,
+            assignmentOperator,
+            getterSelector,
+            selector);
+      case SendStructureKind.PREFIX:
+        Selector getterSelector =
+            elements.getGetterSelectorInComplexSendSet(node);
+        return new PrefixStructure(
+            semantics,
+            incDecOperator,
+            getterSelector,
+            selector);
+      case SendStructureKind.POSTFIX:
+        Selector getterSelector =
+            elements.getGetterSelectorInComplexSendSet(node);
+        return new PostfixStructure(
+            semantics,
+            incDecOperator,
+            getterSelector,
+            selector);
+    }
+  }
+
+  AccessSemantics computeAccessSemantics(Send node,
+                                         {bool isGetOrSet: false,
+                                          bool isInvoke: false,
+                                          bool isCompound: false}) {
+    Element element = elements[node];
+    Element getter = isCompound ? elements[node.selector] : null;
+    if (elements.isTypeLiteral(node)) {
+      DartType dartType = elements.getTypeLiteralType(node);
+      TypeConstantExpression constant = elements.getConstant(
+          isInvoke ? node.selector : node);
+      switch (dartType.kind) {
+        case TypeKind.INTERFACE:
+          return new ConstantAccess.classTypeLiteral(constant);
+        case TypeKind.TYPEDEF:
+          return new ConstantAccess.typedefTypeLiteral(constant);
+        case TypeKind.TYPE_VARIABLE:
+          return new StaticAccess.typeParameterTypeLiteral(dartType.element);
+        case TypeKind.DYNAMIC:
+          return new ConstantAccess.dynamicTypeLiteral(constant);
+        default:
+          return internalError(node, "Unexpected type literal type: $dartType");
+      }
+    } else if (node.isSuperCall) {
+      if (Elements.isUnresolved(element)) {
+        return new StaticAccess.unresolved(element);
+      } else if (isCompound && Elements.isUnresolved(getter)) {
+        // TODO(johnniwinther): Ensure that [getter] is not null. This happens
+        // in the case of missing super getter.
+        return new StaticAccess.unresolved(getter);
+      } else if (element.isField) {
+        if (getter != null && getter != element) {
+          CompoundAccessKind accessKind;
+          if (getter.isField) {
+            accessKind = CompoundAccessKind.SUPER_FIELD_FIELD;
+          } else if (getter.isGetter) {
+            accessKind = CompoundAccessKind.SUPER_GETTER_FIELD;
+          } else {
+            return internalError(node,
+               "Unsupported super call: $node : $element/$getter.");
+          }
+          return new CompoundAccessSemantics(accessKind, getter, element);
+        }
+        return new StaticAccess.superField(element);
+      } else if (element.isGetter) {
+        return new StaticAccess.superGetter(element);
+      } else if (element.isSetter) {
+        if (getter != null) {
+          CompoundAccessKind accessKind;
+          if (getter.isField) {
+            accessKind = CompoundAccessKind.SUPER_FIELD_SETTER;
+          } else if (getter.isGetter) {
+            accessKind = CompoundAccessKind.SUPER_GETTER_SETTER;
+          } else {
+            accessKind = CompoundAccessKind.SUPER_METHOD_SETTER;
+          }
+          return new CompoundAccessSemantics(accessKind, getter, element);
+        }
+        return new StaticAccess.superSetter(element);
+      } else if (isCompound) {
+        return new CompoundAccessSemantics(
+            CompoundAccessKind.SUPER_GETTER_SETTER, getter, element);
+      } else {
+        return new StaticAccess.superMethod(element);
+      }
+    } else if (node.isOperator) {
+      return new DynamicAccess.dynamicProperty(node.receiver);
+    } else if (Elements.isClosureSend(node, element)) {
+      if (element == null) {
+        if (node.selector.isThis()) {
+          return new AccessSemantics.thisAccess();
+        } else {
+          return new AccessSemantics.expression();
+        }
+      } else if (Elements.isErroneous(element)) {
+        return new StaticAccess.unresolved(element);
+      } else {
+        return handleStaticallyResolvedAccess(node, element, getter);
+      }
+    } else {
+      if (Elements.isErroneous(element)) {
+        return new StaticAccess.unresolved(element);
+      } else if (element == null || element.isInstanceMember) {
+        if (node.receiver == null || node.receiver.isThis()) {
+          return new AccessSemantics.thisProperty();
+        } else {
+          return new DynamicAccess.dynamicProperty(node.receiver);
+        }
+      } else if (element.impliesType) {
+        // TODO(johnniwinther): Provide an [ErroneousElement].
+        // This happens for code like `C.this`.
+        return new StaticAccess.unresolved(null);
+      } else {
+        return handleStaticallyResolvedAccess(node, element, getter);
+      }
+    }
+  }
+}
+