# Cppcheck report - LibreOffice: compilerplugins/clang/plugin.cxx

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    /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
    /*
     * This file is part of the LibreOffice project.
     *
     * Based on LLVM/Clang.
     *
     * This file is distributed under the University of Illinois Open Source
     * License. See LICENSE.TXT for details.
     *
     */

    #include "plugin.hxx"

    #include <cassert>

    #include <clang/Basic/FileManager.h>
    #include <clang/Lex/Lexer.h>

    #include "pluginhandler.hxx"
    #include "compat.hxx"

    /*
    Base classes for plugin actions.
    */
    namespace loplugin
    {

    Plugin::Plugin( const InstantiationData& data )
        : compiler( data.compiler ), handler( data.handler ), name( data.name )
        {
        }

    DiagnosticBuilder Plugin::report( DiagnosticsEngine::Level level, StringRef message, SourceLocation loc ) const
        {
        return handler.report( level, name, message, compiler, loc );
        }

    bool Plugin::ignoreLocation( SourceLocation loc )
        {
        SourceLocation expansionLoc = compiler.getSourceManager().getExpansionLoc( loc );
        if( compiler.getSourceManager().isInSystemHeader( expansionLoc ))
            return true;
        const char* bufferName = compiler.getSourceManager().getPresumedLoc( expansionLoc ).getFilename();
        if( bufferName == NULL
            || strncmp( bufferName, WORKDIR, strlen( WORKDIR )) == 0 )
            return true;
        if( strncmp( bufferName, BUILDDIR, strlen( BUILDDIR )) == 0
            || strncmp( bufferName, SRCDIR, strlen( SRCDIR )) == 0 )
            return false; // ok
        return true;
        }

    void Plugin::registerPlugin( Plugin* (*create)( const InstantiationData& ), const char* optionName, bool isPPCallback, bool byDefault )
        {
        PluginHandler::registerPlugin( create, optionName, isPPCallback, byDefault );
        }

    unordered_map< const Stmt*, const Stmt* > Plugin::parents;

    const Stmt* Plugin::parentStmt( const Stmt* stmt )
        {
        if( parents.empty())
            buildParents( compiler );
    if(parents.count(stmt)!=1)stmt->dump();
        assert( parents.count( stmt ) == 1 );
        return parents[ stmt ];
        }

    Stmt* Plugin::parentStmt( Stmt* stmt )
        {
        if( parents.empty())
            buildParents( compiler );
        assert( parents.count( stmt ) == 1 );
        return const_cast< Stmt* >( parents[ stmt ] );
        }

    bool Plugin::isInUnoIncludeFile(SourceLocation spellingLocation) const {
        StringRef name {
            compiler.getSourceManager().getFilename(spellingLocation) };
        return compat::isInMainFile(compiler.getSourceManager(), spellingLocation)
            ? (name == SRCDIR "/cppu/source/cppu/compat.cxx"
               || name == SRCDIR "/cppuhelper/source/compat.cxx"
               || name == SRCDIR "/sal/osl/all/compat.cxx")
            : (name.startswith(SRCDIR "/include/com/")
               || name.startswith(SRCDIR "/include/cppu/")<--- Same expression on both sides of '||'.
               || name.startswith(SRCDIR "/include/cppuhelper/")<--- Same expression on both sides of '||'.
               || name.startswith(SRCDIR "/include/osl/")<--- Same expression on both sides of '||'.
               || name.startswith(SRCDIR "/include/rtl/")<--- Same expression on both sides of '||'.
               || name.startswith(SRCDIR "/include/sal/")<--- Same expression on both sides of '||'.
               || name.startswith(SRCDIR "/include/salhelper/")<--- Same expression on both sides of '||'.
               || name.startswith(SRCDIR "/include/systools/")<--- Same expression on both sides of '||'.
               || name.startswith(SRCDIR "/include/typelib/")<--- Same expression on both sides of '||'.
               || name.startswith(SRCDIR "/include/uno/")<--- Same expression on both sides of '||'.
               || name.startswith(SRCDIR "/workdir/")<--- Same expression on both sides of '||'.
               || name == SRCDIR "/include/comphelper/implbase_var.hxx");
    }

    namespace
    {
    class ParentBuilder
        : public RecursiveASTVisitor< ParentBuilder >
        {
        public:
            bool VisitFunctionDecl( const FunctionDecl* function );
            bool VisitObjCMethodDecl( const ObjCMethodDecl* method );
            void walk( const Stmt* stmt );
            unordered_map< const Stmt*, const Stmt* >* parents;
        };

    bool ParentBuilder::VisitFunctionDecl( const FunctionDecl* function )
        {
    //    if( ignoreLocation( declaration ))
    //        return true; ???
        if( function->doesThisDeclarationHaveABody())
            {
            const Stmt* body = function->getBody();
            (*parents)[ body ] = NULL; // no parent
            walk( body );
            }
        if( const CXXConstructorDecl* ctor = dyn_cast< CXXConstructorDecl >( function ))
            {
            for( CXXConstructorDecl::init_const_iterator it = ctor->init_begin();
                 it != ctor->init_end();
                 ++it )
                {
                const Expr* init_expression = (*it)->getInit();
                (*parents)[ init_expression ] = NULL;
                walk( init_expression );
                }
            }
        return true;
        }

    bool ParentBuilder::VisitObjCMethodDecl( const ObjCMethodDecl* method )<--- The function 'VisitObjCMethodDecl' is never used.
        {
    //    if( ignoreLocation( declaration ))
    //        return true; ???
        if( method->hasBody())
            {
            const Stmt* body = method->getBody();
            (*parents)[ body ] = NULL; // no parent
            walk( body );
            }
        return true;
        }

    void ParentBuilder::walk( const Stmt* stmt )
        {
        for( ConstStmtIterator it = stmt->child_begin();
             it != stmt->child_end();
             ++it )
            {
            if( *it != NULL )
                {
                (*parents)[ *it ] = stmt;
                walk( *it );
                }
            }
        }

    } // namespace

    void Plugin::buildParents( CompilerInstance& compiler )
        {
        assert( parents.empty());
        ParentBuilder builder;
        builder.parents = &parents;
        builder.TraverseDecl( compiler.getASTContext().getTranslationUnitDecl());
        }

    SourceLocation Plugin::locationAfterToken( SourceLocation location )
        {
        return Lexer::getLocForEndOfToken( location, 0, compiler.getSourceManager(), compiler.getLangOpts());
        }

    RewritePlugin::RewritePlugin( const InstantiationData& data )
        : Plugin( data )
        , rewriter( data.rewriter )
        {
        }

    bool RewritePlugin::insertText( SourceLocation Loc, StringRef Str, bool InsertAfter, bool indentNewLines )
        {
        assert( rewriter );
        if( rewriter->InsertText( Loc, Str, InsertAfter, indentNewLines ))
            return reportEditFailure( Loc );
        return true;
        }

    bool RewritePlugin::insertTextAfter( SourceLocation Loc, StringRef Str )
        {
        assert( rewriter );
        if( rewriter->InsertTextAfter( Loc, Str ))
            return reportEditFailure( Loc );
        return true;
        }

    bool RewritePlugin::insertTextAfterToken( SourceLocation Loc, StringRef Str )
        {
        assert( rewriter );
        if( rewriter->InsertTextAfterToken( Loc, Str ))
            return reportEditFailure( Loc );
        return true;
        }

    bool RewritePlugin::insertTextBefore( SourceLocation Loc, StringRef Str )
        {
        assert( rewriter );
        if( rewriter->InsertTextBefore( Loc, Str ))
            return reportEditFailure( Loc );
        return true;
        }

    bool RewritePlugin::removeText( SourceLocation Start, unsigned Length, RewriteOptions opts )
        {
        CharSourceRange range( SourceRange( Start, Start.getLocWithOffset( Length )), false );
        return removeText( range, opts );
        }

    bool RewritePlugin::removeText( SourceRange range, RewriteOptions opts )
        {
        return removeText( CharSourceRange( range, true ), opts );
        }

    bool RewritePlugin::removeText( CharSourceRange range, RewriteOptions opts )
        {
        assert( rewriter );
        if( rewriter->getRangeSize( range, opts ) == -1 )
            return reportEditFailure( range.getBegin());
        if( !handler.addRemoval( range.getBegin() ) )
            {
            report( DiagnosticsEngine::Warning, "double code removal, possible plugin error", range.getBegin());
            return true;
            }
        if( opts.flags & RemoveWholeStatement || opts.flags & RemoveAllWhitespace )
            {
            if( !adjustRangeForOptions( &range, opts ))
                return reportEditFailure( range.getBegin());
            }
        if( rewriter->RemoveText( range, opts ))
            return reportEditFailure( range.getBegin());
        return true;
        }

    bool RewritePlugin::adjustRangeForOptions( CharSourceRange* range, RewriteOptions opts )
        {
        assert( rewriter );
        SourceManager& SM = rewriter->getSourceMgr();
        SourceLocation fileStartLoc = SM.getLocForStartOfFile( SM.getFileID( range->getBegin()));
        if( fileStartLoc.isInvalid())
            return false;
        bool invalid = false;
        const char* fileBuf = SM.getCharacterData( fileStartLoc, &invalid );
        if( invalid )
            return false;
        const char* startBuf = SM.getCharacterData( range->getBegin(), &invalid );
        if( invalid )
            return false;
        SourceLocation locationEnd = range->getEnd();
        if( range->isTokenRange())
            locationEnd = locationAfterToken( locationEnd );
        const char* endBuf = SM.getCharacterData( locationEnd, &invalid );
        if( invalid )
            return false;
        const char* startPos = startBuf;
        --startPos;
        while( startPos >= fileBuf && ( *startPos == ' ' || *startPos == '\t' ))
            --startPos;
        if( startPos >= fileBuf && *startPos == '\n' )
            startPos = startBuf - 1; // do not remove indentation whitespace (RemoveLineIfEmpty can do that)
        const char* endPos = endBuf;
        while( *endPos == ' ' || *endPos == '\t' )
            ++endPos;
        if( opts.flags & RemoveWholeStatement )
            {
            if( *endPos == ';' )
                ++endPos;
            else
                return false;
            }
        *range = CharSourceRange( SourceRange( range->getBegin().getLocWithOffset( startPos - startBuf + 1 ),
            locationEnd.getLocWithOffset( endPos - endBuf )), false );
        return true;
        }

    bool RewritePlugin::replaceText( SourceLocation Start, unsigned OrigLength, StringRef NewStr )
        {
        assert( rewriter );
        if( OrigLength != 0 && !handler.addRemoval( Start ) )
            {
            report( DiagnosticsEngine::Warning, "double code replacement, possible plugin error", Start );
            return true;
            }
        if( rewriter->ReplaceText( Start, OrigLength, NewStr ))
            return reportEditFailure( Start );
        return true;
        }

    bool RewritePlugin::replaceText( SourceRange range, StringRef NewStr )
        {
        assert( rewriter );
        if( rewriter->getRangeSize( range ) == -1 )
            return reportEditFailure( range.getBegin());
        if( !handler.addRemoval( range.getBegin() ) )
            {
            report( DiagnosticsEngine::Warning, "double code replacement, possible plugin error", range.getBegin());
            return true;
            }
        if( rewriter->ReplaceText( range, NewStr ))
            return reportEditFailure( range.getBegin());
        return true;
        }

    bool RewritePlugin::replaceText( SourceRange range, SourceRange replacementRange )
        {
        assert( rewriter );
        if( rewriter->getRangeSize( range ) == -1 )
            return reportEditFailure( range.getBegin());
        if( !handler.addRemoval( range.getBegin() ) )
            {
            report( DiagnosticsEngine::Warning, "double code replacement, possible plugin error", range.getBegin());
            return true;
            }
        if( rewriter->ReplaceText( range, replacementRange ))
            return reportEditFailure( range.getBegin());
        return true;
        }

    bool RewritePlugin::reportEditFailure( SourceLocation loc )
        {
        report( DiagnosticsEngine::Warning, "cannot perform source modification (macro expansion involved?)", loc );
        return false;
        }

    } // namespace

    /* vim:set shiftwidth=4 softtabstop=4 expandtab: */