Examples of com.google.gwt.dev.jjs.ast.JLocal

com.google.gwt.dev.jjs.ast.JLocal
Java local variable definition.

      } else {
        body = new JBlock(info);
        body.addStmt(action);
      }


      JLocal elementVar = (JLocal) typeMap.get(x.elementVariable.binding);
      String elementVarName = elementVar.getName();


      JDeclarationStatement elementDecl = (JDeclarationStatement) processStatement(x.elementVariable);
      assert (elementDecl.initializer == null);


      JForStatement result;
      if (x.collectionVariable != null) {
        /**
         * <pre>
         * for (final T[] i$array = collection,
         *          int i$index = 0,
         *          final int i$max = i$array.length;
         *      i$index < i$max; ++i$index) {
         *   T elementVar = i$array[i$index];
         *   // user action
         * }
         * </pre>
         */
        JLocal arrayVar = JProgram.createLocal(info, elementVarName + "$array",
            ((JType) typeMap.get(x.collection.resolvedType)), true,
            currentMethodBody);
        JLocal indexVar = JProgram.createLocal(info, elementVarName + "$index",
            program.getTypePrimitiveInt(), false, currentMethodBody);
        JLocal maxVar = JProgram.createLocal(info, elementVarName + "$max",
            program.getTypePrimitiveInt(), true, currentMethodBody);


        List<JStatement> initializers = new ArrayList<JStatement>(3);
        // T[] i$array = arr
        initializers.add(createDeclaration(info, arrayVar,
            dispProcessExpression(x.collection)));
        // int i$index = 0
        initializers.add(createDeclaration(info, indexVar,
            program.getLiteralInt(0)));
        // int i$max = i$array.length
        initializers.add(createDeclaration(info, maxVar, new JArrayLength(info,
            new JLocalRef(info, arrayVar))));


        // i$index < i$max
        JExpression condition = new JBinaryOperation(info,
            program.getTypePrimitiveBoolean(), JBinaryOperator.LT,
            createVariableRef(info, indexVar), createVariableRef(info, maxVar));


        // ++i$index
        List<JExpressionStatement> increments = new ArrayList<JExpressionStatement>(
            1);
        increments.add(new JPrefixOperation(info, JUnaryOperator.INC,
            createVariableRef(info, indexVar)).makeStatement());


        // T elementVar = i$array[i$index];
        elementDecl.initializer = new JArrayRef(info, createVariableRef(info,
            arrayVar), createVariableRef(info, indexVar));
        body.addStmt(0, elementDecl);


        result = new JForStatement(info, initializers, condition, increments,
            body);
      } else {
        /**
         * <pre>
         * for (Iterator<T> i$iterator = collection.iterator(); i$iterator.hasNext();) {
         *   T elementVar = i$iterator.next();
         *   // user action
         * }
         * </pre>
         */
        JLocal iteratorVar = JProgram.createLocal(info,
            (elementVarName + "$iterator"), program.getIndexedType("Iterator"),
            false, currentMethodBody);


        List<JStatement> initializers = new ArrayList<JStatement>(1);
        // Iterator<T> i$iterator = collection.iterator()

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          x.label), body);
    }


    JStatement processStatement(LocalDeclaration x) {
      SourceInfo info = makeSourceInfo(x);
      JLocal local = (JLocal) typeMap.get(x.binding);
      processHasAnnotations(local, x.annotations);
      JLocalRef localRef = new JLocalRef(info, local);
      JExpression initializer = dispProcessExpression(x.initialization);
      return new JDeclarationStatement(info, localRef, initializer);
    }

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      JBlock tryBlock = (JBlock) dispProcessStatement(x.tryBlock);
      List<JLocalRef> catchArgs = new ArrayList<JLocalRef>();
      List<JBlock> catchBlocks = new ArrayList<JBlock>();
      if (x.catchBlocks != null) {
        for (int i = 0, c = x.catchArguments.length; i < c; ++i) {
          JLocal local = (JLocal) typeMap.get(x.catchArguments[i].binding);
          catchArgs.add((JLocalRef) createVariableRef(info, local));
        }
        for (int i = 0, c = x.catchBlocks.length; i < c; ++i) {
          catchBlocks.add((JBlock) dispProcessStatement(x.catchBlocks[i]));
        }

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     * Creates an appropriate JVariableRef for the polymorphic type of the
     * requested JVariable.
     */
    private JVariableRef createVariableRef(SourceInfo info, JVariable variable) {
      if (variable instanceof JLocal) {
        JLocal local = (JLocal) variable;
        if (local.getEnclosingMethod() != currentMethod) {
          throw new InternalCompilerException(
              "LocalRef referencing local in a different method.");
        }
        return new JLocalRef(info, local);
      } else if (variable instanceof JParameter) {

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        JBlock body = popBlock(info, x.action);
        JExpression collection = pop(x.collection);
        JDeclarationStatement elementDecl = pop(x.elementVariable);
        assert (elementDecl.initializer == null);


        JLocal elementVar = (JLocal) curMethod.locals.get(x.elementVariable.binding);
        String elementVarName = elementVar.getName();


        JForStatement result;
        if (x.collectionVariable != null) {
          /**
           * <pre>
         * for (final T[] i$array = collection,
         *          int i$index = 0,
         *          final int i$max = i$array.length;
         *      i$index < i$max; ++i$index) {
         *   T elementVar = i$array[i$index];
         *   // user action
         * }
         * </pre>
           */
          JLocal arrayVar =
              JProgram.createLocal(info, elementVarName + "$array", collection.getType(), true,
                  curMethod.body);
          JLocal indexVar =
              JProgram.createLocal(info, elementVarName + "$index", JPrimitiveType.INT, false,
                  curMethod.body);
          JLocal maxVar =
              JProgram.createLocal(info, elementVarName + "$max", JPrimitiveType.INT, true,
                  curMethod.body);


          List<JStatement> initializers = Lists.newArrayListWithCapacity(3);
          // T[] i$array = arr
          initializers.add(makeDeclaration(info, arrayVar, collection));
          // int i$index = 0
          initializers.add(makeDeclaration(info, indexVar, JIntLiteral.get(0)));
          // int i$max = i$array.length
          initializers.add(makeDeclaration(info, maxVar, new JArrayLength(info, new JLocalRef(info,
              arrayVar))));


          // i$index < i$max
          JExpression condition =
              new JBinaryOperation(info, JPrimitiveType.BOOLEAN, JBinaryOperator.LT, new JLocalRef(
                  info, indexVar), new JLocalRef(info, maxVar));


          // ++i$index
          JExpression increments = new JPrefixOperation(info, JUnaryOperator.INC,
              new JLocalRef(info, indexVar));


          // T elementVar = i$array[i$index];
          elementDecl.initializer =
              new JArrayRef(info, new JLocalRef(info, arrayVar), new JLocalRef(info, indexVar));
          body.addStmt(0, elementDecl);


          result = new JForStatement(info, initializers, condition, increments, body);
        } else {
          /**
           * <pre>
           * for (Iterator&lt;T&gt; i$iterator = collection.iterator(); i$iterator.hasNext();) {
           *   T elementVar = i$iterator.next();
           *   // user action
           * }
           * </pre>
           */
          CompilationUnitScope cudScope = scope.compilationUnitScope();
          ReferenceBinding javaUtilIterator = scope.getJavaUtilIterator();
          ReferenceBinding javaLangIterable = scope.getJavaLangIterable();
          MethodBinding iterator = javaLangIterable.getExactMethod(ITERATOR, NO_TYPES, cudScope);
          MethodBinding hasNext = javaUtilIterator.getExactMethod(HAS_NEXT, NO_TYPES, cudScope);
          MethodBinding next = javaUtilIterator.getExactMethod(NEXT, NO_TYPES, cudScope);
          JLocal iteratorVar =
              JProgram.createLocal(info, (elementVarName + "$iterator"), typeMap
                  .get(javaUtilIterator), false, curMethod.body);


          List<JStatement> initializers = Lists.newArrayListWithCapacity(1);
          // Iterator<T> i$iterator = collection.iterator()

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    @Override
    public void endVisit(LocalDeclaration x, BlockScope scope) {
      try {
        SourceInfo info = makeSourceInfo(x);
        JLocal local = (JLocal) curMethod.locals.get(x.binding);
        assert local != null;
        JLocalRef localRef = new JLocalRef(info, local);
        JExpression initialization = pop(x.initialization);
        push(new JDeclarationStatement(info, localRef, initialization));
      } catch (Throwable e) {

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        }
        List<JTryStatement.CatchClause> catchClauses = Lists.newArrayList();
        if (x.catchBlocks != null) {
          for (int i = 0; i < x.catchArguments.length; i++) {
            Argument argument = x.catchArguments[i];
            JLocal local = (JLocal) curMethod.locals.get(argument.binding);


            List<JType> catchTypes = Lists.newArrayList();
            if (argument.type instanceof UnionTypeReference) {
              // This is a multiexception
              for (TypeReference type : ((UnionTypeReference) argument.type).typeReferences) {
                catchTypes.add(typeMap.get(type.resolvedType));
              }
            } else {
              // Regular exception
              catchTypes.add(local.getType());
            }
            catchClauses.add(new JTryStatement.CatchClause(catchTypes, new JLocalRef(info, local),
                catchBlocks.get(i)));
          }
        }

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      for (int i = x.resources.length - 1; i >= 0; i--) {
        // Needs to iterate back to front to be inline with the contents of the stack.


        JDeclarationStatement resourceDecl = pop(x.resources[i]);


        JLocal resourceVar = (JLocal) curMethod.locals.get(x.resources[i].binding);
        resourceVariables.add(0, resourceVar);
        innerBlock.addStmt(0, resourceDecl);
      }


      // add exception variable
      JLocal exceptionVar = createLocalThrowable(info, "$primary_ex");


      innerBlock.addStmt(makeDeclaration(info, exceptionVar, JNullLiteral.INSTANCE));


      // create catch block
      List<JTryStatement.CatchClause> catchClauses = Lists.newArrayListWithCapacity(1);


      List<JType> clauseTypes = Lists.newArrayListWithCapacity(1);
      clauseTypes.add(javaLangThrowable);


      //     add catch exception variable.
      JLocal catchVar = createLocalThrowable(info, "$caught_ex");


      JBlock catchBlock = new JBlock(info);
      catchBlock.addStmt(createAssignment(info, javaLangThrowable, exceptionVar, catchVar));
      catchBlock.addStmt(new JThrowStatement(info, new JLocalRef(info, exceptionVar)));

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      } else {
        // Special case, a statically unreachable local type.
        localType = JNullType.INSTANCE;
      }
      SourceInfo info = makeSourceInfo(x);
      JLocal newLocal =
          JProgram.createLocal(info, intern(x.name), localType, b.isFinal(), curMethod.body);
      curMethod.locals.put(b, newLocal);
      return newLocal;
    }

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      return false;
    }


    @Override
    public boolean visit(JLocalRef ref, Context ctx) {
      JLocal target = ref.getLocal();
      rescue(target);
      return true;
    }

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