Examples with VariableElement javax.lang.model.element.VariableElement used on opensource projects

Example 71 with VariableElement

use of javax.lang.model.element.VariableElement in project j2objc by google.

the class DeadCodeEliminator method removeDeadFields.

/**
   * Deletes non-constant dead fields from a type's body declarations list.
   */
private void removeDeadFields(String clazz, List<BodyDeclaration> declarations) {
    Iterator<BodyDeclaration> declarationsIter = declarations.iterator();
    while (declarationsIter.hasNext()) {
        BodyDeclaration declaration = declarationsIter.next();
        if (declaration instanceof FieldDeclaration) {
            FieldDeclaration field = (FieldDeclaration) declaration;
            Iterator<VariableDeclarationFragment> fragmentsIter = field.getFragments().iterator();
            while (fragmentsIter.hasNext()) {
                VariableDeclarationFragment fragment = fragmentsIter.next();
                // Don't delete any constants because we can't detect their use.
                VariableElement var = fragment.getVariableElement();
                if (var.getConstantValue() == null && deadCodeMap.containsField(clazz, ElementUtil.getName(var))) {
                    fragmentsIter.remove();
                }
            }
            if (field.getFragments().isEmpty()) {
                declarationsIter.remove();
            }
        }
    }
}

Example 72 with VariableElement

use of javax.lang.model.element.VariableElement 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 73 with VariableElement

use of javax.lang.model.element.VariableElement in project j2objc by google.

the class UnsequencedExpressionRewriter method extractOrderedAccesses.

private void extractOrderedAccesses(List<Statement> stmtList, TreeNode subExpr, List<VariableAccess> toExtract) {
    for (int i = 0; i < toExtract.size(); i++) {
        VariableAccess access = toExtract.get(i);
        TreeNode topConditional = getTopConditional(access.expression, subExpr);
        if (topConditional != null) {
            // Conditional expressions require special handling when extracting the
            // access because execution of the access may not be guaranteed.
            // Here we collect all accesses that are decendant of the conditional
            // expression and pass them to an appropriate extraction method.
            int j = i + 1;
            for (; j < toExtract.size(); j++) {
                if (getTopConditional(toExtract.get(j).expression, subExpr) != topConditional) {
                    break;
                }
            }
            if (topConditional instanceof InfixExpression) {
                extractInfixConditional(stmtList, (InfixExpression) topConditional, toExtract.subList(i, j));
            } else if (topConditional instanceof ConditionalExpression) {
                extractConditionalExpression(stmtList, (ConditionalExpression) topConditional, toExtract.subList(i, j));
            } else {
                throw new AssertionError("Unexpected conditional node type: " + topConditional.getClass().toString());
            }
            i = j - 1;
        } else {
            VariableElement newVar = GeneratedVariableElement.newLocalVar("unseq$" + count++, access.expression.getTypeMirror(), currentMethod);
            stmtList.add(new VariableDeclarationStatement(newVar, access.expression.copy()));
            access.expression.replaceWith(new SimpleName(newVar));
        }
    }
}

Example 74 with VariableElement

use of javax.lang.model.element.VariableElement in project j2objc by google.

the class NilCheckResolver method addNilCheck.

private void addNilCheck(Expression node) {
    if (!needsNilCheck(node)) {
        return;
    }
    VariableElement var = TreeUtil.getVariableElement(node);
    if (var != null) {
        addSafeVar(var);
    }
    TypeMirror idType = TypeUtil.ID_TYPE;
    FunctionElement element = new FunctionElement("nil_chk", idType, null).addParameters(idType);
    FunctionInvocation nilChkInvocation = new FunctionInvocation(element, node.getTypeMirror());
    node.replaceWith(nilChkInvocation);
    nilChkInvocation.addArgument(node);
}

Example 75 with VariableElement

use of javax.lang.model.element.VariableElement in project j2objc by google.

the class NilCheckResolver method visit.

@Override
public boolean visit(InfixExpression node) {
    InfixExpression.Operator op = node.getOperator();
    boolean logicalAnd = op == InfixExpression.Operator.CONDITIONAL_AND;
    boolean logicalOr = op == InfixExpression.Operator.CONDITIONAL_OR;
    if (logicalAnd || logicalOr) {
        return handleConditionalOperator(node, logicalAnd);
    }
    boolean equals = op == InfixExpression.Operator.EQUALS;
    boolean notEquals = op == InfixExpression.Operator.NOT_EQUALS;
    if (equals || notEquals) {
        Expression lhs = node.getOperand(0);
        Expression rhs = node.getOperand(1);
        VariableElement maybeNullVar = null;
        if (lhs instanceof NullLiteral) {
            maybeNullVar = TreeUtil.getVariableElement(rhs);
        } else if (rhs instanceof NullLiteral) {
            maybeNullVar = TreeUtil.getVariableElement(lhs);
        }
        if (maybeNullVar != null) {
            if (equals) {
                setConditionalSafeVars(node, EMPTY_VARS, Collections.singleton(maybeNullVar));
            } else {
                setConditionalSafeVars(node, Collections.singleton(maybeNullVar), EMPTY_VARS);
            }
        }
    }
    return true;
}