content/xslt/src/xslt/txPatternOptimizer.cpp
author Ehsan Akhgari <ehsan@mozilla.com>
Wed, 22 Aug 2012 11:56:38 -0400
changeset 102997 a16372ce30b5f6b747246b01fcd215a4bf3b6342
parent 100844 b5c4b792f3f2a047e3517472d72842a76afb77cd
permissions -rw-r--r--
Bug 579517 - Part 1: Automated conversion of NSPR numeric types to stdint types in Gecko; r=bsmedberg This patch was generated by a script. Here's the source of the script for future reference: function convert() { echo "Converting $1 to $2..." find . ! -wholename "*nsprpub*" \ ! -wholename "*security/nss*" \ ! -wholename "*/.hg*" \ ! -wholename "obj-ff-dbg*" \ ! -name nsXPCOMCID.h \ ! -name prtypes.h \ -type f \ \( -iname "*.cpp" \ -o -iname "*.h" \ -o -iname "*.c" \ -o -iname "*.cc" \ -o -iname "*.idl" \ -o -iname "*.ipdl" \ -o -iname "*.ipdlh" \ -o -iname "*.mm" \) | \ xargs -n 1 sed -i -e "s/\b$1\b/$2/g" } convert PRInt8 int8_t convert PRUint8 uint8_t convert PRInt16 int16_t convert PRUint16 uint16_t convert PRInt32 int32_t convert PRUint32 uint32_t convert PRInt64 int64_t convert PRUint64 uint64_t convert PRIntn int convert PRUintn unsigned convert PRSize size_t convert PROffset32 int32_t convert PROffset64 int64_t convert PRPtrdiff ptrdiff_t convert PRFloat64 double

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "txPatternOptimizer.h"
#include "txXSLTPatterns.h"

nsresult
txPatternOptimizer::optimize(txPattern* aInPattern, txPattern** aOutPattern)
{
    *aOutPattern = nullptr;
    nsresult rv = NS_OK;

    // First optimize sub expressions
    uint32_t i = 0;
    Expr* subExpr;
    while ((subExpr = aInPattern->getSubExprAt(i))) {
        Expr* newExpr = nullptr;
        rv = mXPathOptimizer.optimize(subExpr, &newExpr);
        NS_ENSURE_SUCCESS(rv, rv);
        if (newExpr) {
            delete subExpr;
            aInPattern->setSubExprAt(i, newExpr);
        }

        ++i;
    }

    // Then optimize sub patterns
    txPattern* subPattern;
    i = 0;
    while ((subPattern = aInPattern->getSubPatternAt(i))) {
        txPattern* newPattern = nullptr;
        rv = optimize(subPattern, &newPattern);
        NS_ENSURE_SUCCESS(rv, rv);
        if (newPattern) {
            delete subPattern;
            aInPattern->setSubPatternAt(i, newPattern);
        }

        ++i;
    }

    // Finally see if current pattern can be optimized
    switch (aInPattern->getType()) {
        case txPattern::STEP_PATTERN:
            return optimizeStep(aInPattern, aOutPattern);

        default:
            break;
    }

    return NS_OK;
}


nsresult
txPatternOptimizer::optimizeStep(txPattern* aInPattern,
                                 txPattern** aOutPattern)
{
    txStepPattern* step = static_cast<txStepPattern*>(aInPattern);

    // Test for predicates that can be combined into the nodetest
    Expr* pred;
    while ((pred = step->getSubExprAt(0)) &&
           !pred->canReturnType(Expr::NUMBER_RESULT) &&
           !pred->isSensitiveTo(Expr::NODESET_CONTEXT)) {
        txNodeTest* predTest = new txPredicatedNodeTest(step->getNodeTest(),
                                                        pred);
        step->dropFirst();
        step->setNodeTest(predTest);
    }

    return NS_OK;
}