Examples with Expression com.google.devtools.j2objc.ast.Expression used on opensource projects

Example 6 with Expression

use of com.google.devtools.j2objc.ast.Expression in project j2objc by google.

the class ConstantBranchPruner method endVisit.

@Override
public void endVisit(IfStatement node) {
    Expression expr = node.getExpression();
    Boolean value = getKnownValue(expr);
    if (value != null) {
        Statement sideEffects = getSideEffects(expr);
        if (sideEffects != null) {
            TreeUtil.insertBefore(node, sideEffects);
        }
        if (value) {
            node.replaceWith(TreeUtil.remove(node.getThenStatement()));
        } else if (node.getElseStatement() != null) {
            node.replaceWith(TreeUtil.remove(node.getElseStatement()));
        } else {
            node.remove();
        }
    }
}

Example 7 with Expression

use of com.google.devtools.j2objc.ast.Expression in project j2objc by google.

the class SwitchRewriter method fixVariableDeclarations.

/**
   * Moves all variable declarations above the first case statement.
   */
private void fixVariableDeclarations(SwitchStatement node) {
    List<Statement> statements = node.getStatements();
    Block block = new Block();
    List<Statement> blockStmts = block.getStatements();
    for (int i = 0; i < statements.size(); i++) {
        Statement stmt = statements.get(i);
        if (stmt instanceof VariableDeclarationStatement) {
            VariableDeclarationStatement declStmt = (VariableDeclarationStatement) stmt;
            statements.remove(i--);
            List<VariableDeclarationFragment> fragments = declStmt.getFragments();
            for (VariableDeclarationFragment decl : fragments) {
                Expression initializer = decl.getInitializer();
                if (initializer != null) {
                    Assignment assignment = new Assignment(new SimpleName(decl.getVariableElement()), TreeUtil.remove(initializer));
                    statements.add(++i, new ExpressionStatement(assignment));
                }
            }
            blockStmts.add(declStmt);
        }
    }
    if (blockStmts.size() > 0) {
        // There is at least one variable declaration, so copy this switch
        // statement into the new block and replace it in the parent list.
        node.replaceWith(block);
        blockStmts.add(node);
    }
}

Example 8 with Expression

use of com.google.devtools.j2objc.ast.Expression in project j2objc by google.

the class UnsequencedExpressionRewriter method extractInfixConditional.

private void extractInfixConditional(List<Statement> stmtList, InfixExpression conditional, List<VariableAccess> toExtract) {
    InfixExpression.Operator op = conditional.getOperator();
    List<Expression> branches = conditional.getOperands();
    int lastIfExtractIdx = 0;
    VariableElement conditionalVar = null;
    int lastExtracted = 0;
    Expression lastBranch = null;
    for (int i = 0; i < toExtract.size(); i++) {
        VariableAccess access = toExtract.get(i);
        TreeNode node = access.expression;
        while (node.getParent() != conditional) {
            node = node.getParent();
        }
        assert node instanceof Expression;
        Expression branch = (Expression) node;
        // Extract all accesses from the previous branch.
        if (lastBranch != null && branch != lastBranch) {
            extractOrderedAccesses(stmtList, lastBranch, toExtract.subList(lastExtracted, i));
            lastExtracted = i;
        }
        lastBranch = branch;
        // If there's a new access in a new branch, then we extract an if-statement.
        if (branch != branches.get(lastIfExtractIdx)) {
            TypeMirror boolType = typeUtil.getBoolean();
            if (conditionalVar == null) {
                conditionalVar = GeneratedVariableElement.newLocalVar("unseq$" + count++, boolType, currentMethod);
                conditional.replaceWith(new SimpleName(conditionalVar));
                stmtList.add(new VariableDeclarationStatement(conditionalVar, null));
            }
            List<Expression> subBranches = branches.subList(lastIfExtractIdx, branches.indexOf(branch));
            IfStatement newIf = new IfStatement();
            Expression ifExpr = new Assignment(new SimpleName(conditionalVar), conditionalFromSubBranches(subBranches, op));
            if (op == InfixExpression.Operator.CONDITIONAL_OR) {
                ifExpr = new PrefixExpression(boolType, PrefixExpression.Operator.NOT, ParenthesizedExpression.parenthesize(ifExpr));
            }
            newIf.setExpression(ifExpr);
            stmtList.add(newIf);
            Block thenBlock = new Block();
            stmtList = thenBlock.getStatements();
            newIf.setThenStatement(thenBlock);
            lastIfExtractIdx = branches.indexOf(branch);
        }
    }
    extractOrderedAccesses(stmtList, lastBranch, toExtract.subList(lastExtracted, toExtract.size()));
    if (conditionalVar != null) {
        List<Expression> remainingBranches = Lists.newArrayList();
        remainingBranches.add(new SimpleName(conditionalVar));
        remainingBranches.addAll(branches.subList(lastIfExtractIdx, branches.size()));
        stmtList.add(new ExpressionStatement(new Assignment(new SimpleName(conditionalVar), conditionalFromSubBranches(remainingBranches, op))));
    }
}

Example 9 with Expression

use of com.google.devtools.j2objc.ast.Expression in project j2objc by google.

the class UnsequencedExpressionRewriter method visit.

@Override
public boolean visit(SuperConstructorInvocation node) {
    newExpression(node);
    for (Expression arg : node.getArguments()) {
        arg.accept(this);
    }
    extractUnsequenced(node);
    return false;
}

Example 10 with Expression

use of com.google.devtools.j2objc.ast.Expression in project j2objc by google.

the class UnsequencedExpressionRewriter method extractExpressionList.

private void extractExpressionList(List<Expression> expressions, List<Statement> stmtList, boolean extractModifiedExpression) {
    for (int i = 0; i < expressions.size(); i++) {
        Expression expr = expressions.get(i);
        newExpression(expr);
        expr.accept(this);
        List<VariableAccess> unsequencedAccesses = getUnsequencedAccesses();
        if (!unsequencedAccesses.isEmpty()) {
            for (int j = 0; j < i; j++) {
                stmtList.add(new ExpressionStatement(expressions.get(j).copy()));
            }
            expressions.subList(0, i).clear();
            extractOrderedAccesses(stmtList, currentTopNode, unsequencedAccesses);
            i = 0;
            if (extractModifiedExpression) {
                stmtList.add(new ExpressionStatement(expressions.get(0).copy()));
                expressions.remove(0);
                i = -1;
            }
        }
    }
}