srcanamdw/codescanner/scripts/trapeleave.py
author noe\swadi
Thu, 18 Feb 2010 12:29:02 +0530
changeset 1 22878952f6e2
permissions -rw-r--r--
Committing the CodeScanner Core tool This component has been moved from the StaticAnaApps package. BUG : 5889 (http://developer.symbian.org/webbugs/show_bug.cgi?id=5889).
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# #################################################################
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# Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
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# All rights reserved.
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# 
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# Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
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# 
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# * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
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# * Neither the name of Nokia Corporation nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
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# 
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 
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# THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS 
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# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
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# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
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# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.#
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#
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# trapeleave.py
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#
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# Checks : Trapping new(ELeave).
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#
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# Reason : The trapping of a "new(ELeave) CXxx" call is redundant 
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# and wasteful as the code to support TRAP is surprisingly large. 
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# If the instantiation process really needs not to leave, use 
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# "new CXxx" and check for NULL.
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#
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# #################################################################
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script = CScript("trapeleave")
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script.iReString = "^\s*TRAPD?"
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script.iFileExts = ["cpp"]
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script.iCategory = KCategoryPerformance
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script.iIgnore = KIgnoreCommentsAndQuotes
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script.iSeverity = KSeverityMedium
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reELeave = re.compile("""
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    new
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    \s*        # whitespace
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    \(         # open bracket
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    \s*        # whitespace
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    ELeave
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    \s*        # whitespace
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    \)         # close bracket
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""", re.VERBOSE)
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def trapeleavecompare(lines, currentline, rematch, filename):
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    line = lines[currentline]
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    m = rematch.search(line)
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    if m:
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        if (line.find("(") == -1) and (currentline + 1 < len(lines)):
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            currentline += 1
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            line = lines[currentline]
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        bracketCount = line.count("(") - line.count(")")
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        found = reELeave.search(line) 
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        while (bracketCount > 0) and (currentline + 1 < len(lines)):
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            currentline += 1
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            line = lines[currentline]
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            bracketCount += line.count("(") - line.count(")")
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            if not found:
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                found = reELeave.search(line) 
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        if found:
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            return 1
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    return 0
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script.iCompare = trapeleavecompare
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scanner.AddScript(script)