Package com.google.gwt.dev.jjs.ast

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

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      throw new UnableToCompleteException();
    }
    SourceInfo sourceInfo = reboundEntryType.getSourceInfo().makeChild(
        JavaToJavaScriptCompiler.class, "Rebound entry point");

    JExpression qualifier = null;
    if (!entryMethod.isStatic()) {
      qualifier = JGwtCreate.createInstantiationExpression(sourceInfo,
          entryClass);

      if (qualifier == null) {
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            JBinaryOperator.AND, condExpr, thenExpr);
        return binOp;
      }
    } else {
      // e.g. (!cond ? then : else) -> (cond ? else : then)
      JExpression unflipped = maybeUnflipBoolean(condExpr);
      if (unflipped != null) {
        return new JConditional(sourceInfo, type, unflipped, elseExpr, thenExpr);
      }
    }
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      return condExpr.makeStatement();
    }

    if (!isEmpty(elseStmt)) {
      // if (!cond) foo else bar -> if (cond) bar else foo
      JExpression unflipped = Simplifier.maybeUnflipBoolean(condExpr);
      if (unflipped != null) {
        // Force sub-parts to blocks, otherwise we break else-if chains.
        // TODO: this goes away when we normalize the Java AST properly.
        thenStmt = ensureBlock(thenStmt);
        elseStmt = ensureBlock(elseStmt);
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   */
  public class FixDanglingRefsVisitor extends JModVisitor {

    @Override
    public void endVisit(JFieldRef x, Context ctx) {
      JExpression instance = x.getInstance();
      boolean isStatic = x.getField().isStatic();
      if (isStatic && instance != null) {
        // this doesn't really belong here, but while we're here let's remove
        // non-side-effect qualifiers to statics
        if (!instance.hasSideEffects()) {
          JFieldRef fieldRef = new JFieldRef(x.getSourceInfo(), null,
              x.getField(), x.getEnclosingType());
          ctx.replaceMe(fieldRef);
        }
      } else if (!isStatic && instance.getType() == typeNull
          && x.getField() != program.getNullField()) {
        // Change any dereference of null to use the null field
        ctx.replaceMe(Pruner.transformToNullFieldRef(x, program));
      }
    }
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      }
    }

    @Override
    public void endVisit(JMethodCall x, Context ctx) {
      JExpression instance = x.getInstance();
      JMethod method = x.getTarget();
      boolean isStatic = method.isStatic();
      boolean isStaticImpl = program.isStaticImpl(method);
      if (isStatic && !isStaticImpl && instance != null) {
        // this doesn't really belong here, but while we're here let's remove
        // non-side-effect qualifiers to statics
        if (!instance.hasSideEffects()) {
          JMethodCall newCall = new JMethodCall(x.getSourceInfo(), null,
              x.getTarget());
          newCall.addArgs(x.getArgs());
          ctx.replaceMe(newCall);
        }
      } else if (!isStatic && instance.getType() == typeNull) {
        ctx.replaceMe(Pruner.transformToNullMethodCall(x, program));
      } else if (isStaticImpl && method.getParams().size() > 0
          && method.getParams().get(0).isThis() && x.getArgs().size() > 0
          && x.getArgs().get(0).getType() == typeNull) {
        // bind null instance calls to the null method for static impls
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    private JMethod currentMethod;

    @Override
    public void endVisit(JBinaryOperation x, Context ctx) {
      if (x.isAssignment() && (x.getType() instanceof JReferenceType)) {
        JExpression lhs = x.getLhs();
        if (lhs instanceof JVariableRef) {
          addAssignment(((JVariableRef) lhs).getTarget(), x.getRhs());
        } else {
          assert lhs instanceof JArrayRef;
        }
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      }
    }

    @Override
    public void endVisit(JDeclarationStatement x, Context ctx) {
      JExpression initializer = x.getInitializer();
      if (initializer != null) {
        addAssignment(x.getVariableRef().getTarget(), initializer);
      }
    }
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      // the arguments from the caller
      Iterator<JExpression> argIt = x.getArgs().iterator();
      List<JParameter> params = x.getTarget().getParams();
      for (int i = 0; i < params.size(); ++i) {
        JParameter param = params.get(i);
        JExpression arg = argIt.next();
        if (param.getType() instanceof JReferenceType) {
          addAssignment(param, arg);
        }
      }
    }
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        x = newCall;
      }

      if (x.canBePolymorphic()) {
        // See if we can remove virtualization from this call.
        JExpression instance = x.getInstance();
        assert (instance != null);
        JReferenceType instanceType = (JReferenceType) instance.getType();
        Set<JMethod> myOverriders = overriders.get(target);
        if (myOverriders != null) {
          for (JMethod override : myOverriders) {
            JReferenceType overrideType = override.getEnclosingType();
            if (program.typeOracle.canTheoreticallyCast(instanceType,
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     * Short circuit binary operations.
     */
    @Override
    public void endVisit(JBinaryOperation x, Context ctx) {
      JBinaryOperator op = x.getOp();
      JExpression lhs = x.getLhs();
      JExpression rhs = x.getRhs();
      if ((lhs instanceof JValueLiteral) && (rhs instanceof JValueLiteral)) {
        if (evalOpOnLiterals(op, (JValueLiteral) lhs, (JValueLiteral) rhs, ctx)) {
          return;
        }
      }
      switch (op) {
        case AND:
          shortCircuitAnd(lhs, rhs, ctx);
          break;
        case OR:
          shortCircuitOr(lhs, rhs, ctx);
          break;
        case BIT_XOR:
          simplifyXor(lhs, rhs, ctx);
          break;
        case EQ:
          // simplify: null == null -> true
          if (lhs.getType() == program.getTypeNull()
              && rhs.getType() == program.getTypeNull() && !x.hasSideEffects()) {
            ctx.replaceMe(program.getLiteralBoolean(true));
            return;
          }
          simplifyEq(lhs, rhs, ctx, false);
          break;
        case NEQ:
          // simplify: null != null -> false
          if (lhs.getType() == program.getTypeNull()
              && rhs.getType() == program.getTypeNull() && !x.hasSideEffects()) {
            ctx.replaceMe(program.getLiteralBoolean(false));
            return;
          }
          simplifyEq(lhs, rhs, ctx, true);
          break;
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Related Classes of com.google.gwt.dev.jjs.ast.JExpression

  • com.google.gwt.dev.jjs.ast.js.JMultiExpression
  • com.google.gwt.dev.jjs.impl.ArrayNormalizer$ArrayVisitor
  • com.google.gwt.dev.jjs.impl.AssertionNormalizer$AssertNormalizeVisitor
  • com.google.gwt.dev.jjs.impl.CastNormalizer$AssignTypeIdsVisitor
  • com.google.gwt.dev.jjs.impl.CastNormalizer$ConcatVisitor
  • com.google.gwt.dev.jjs.impl.CastNormalizer$ReplaceTypeChecksVisitor
  • com.google.gwt.dev.jjs.impl.CatchBlockNormalizer$CollapseCatchBlocks
  • com.google.gwt.dev.jjs.impl.CatchBlockNormalizer$UnwrapJavaScriptExceptionVisitor
  • com.google.gwt.dev.jjs.impl.CloneExpressionVisitor
  • com.google.gwt.dev.jjs.impl.codesplitter.CodeSplitters
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