4fd910a096
http://wiki.documentfoundation.org/Clang_plugins Change-Id: Ieb4fc186490e81ab961c094ca0a7fcdabc0f348f
75 lines
2.1 KiB
C++
75 lines
2.1 KiB
C++
/*
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* This file is part of the LibreOffice project.
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*
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* Based on LLVM/Clang.
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*
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* This file is distributed under the University of Illinois Open Source
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* License. See LICENSE.TXT for details.
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*
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*/
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#include "tutorial3.hxx"
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/*
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This is a rewriter.
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It looks for if statements with a comparison followed by literal return false
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and modifies the return statements to 'return maybereturntrue;'
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*/
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namespace loplugin
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{
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// Ctor, pass arguments.
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Tutorial3::Tutorial3( ASTContext& context, Rewriter& rewriter )
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: RewritePlugin( context, rewriter )
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{
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}
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void Tutorial3::run()
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{
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TraverseDecl( context.getTranslationUnitDecl());
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}
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bool Tutorial3::VisitIfStmt( IfStmt* ifstmt )
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{
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if( ignoreLocation( ifstmt ))
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return true;
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if( const BinaryOperator* oper = dyn_cast< BinaryOperator >( ifstmt->getCond()))
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{
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if( oper->getOpcode() == BO_EQ )
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{
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// Modify the sub-statement if it is 'return false'.
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modifyReturnFalse( ifstmt->getThen());
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// Modify the sub-statement if it is '{ return false; }'.
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if( CompoundStmt* compound = dyn_cast< CompoundStmt >( ifstmt->getThen()))
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{
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if( compound->size() == 1 ) // one statement
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modifyReturnFalse( *compound->body_begin());
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}
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}
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}
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return true;
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}
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void Tutorial3::modifyReturnFalse( const Stmt* stmt )
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{
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// Is it return statement?
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if( const ReturnStmt* returnstmt = dyn_cast< ReturnStmt >( stmt ))
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{
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// dyn_cast_or_null<> can also be passed NULL, unlike dyn_cast<>
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if( const CXXBoolLiteralExpr* boolliteral = dyn_cast_or_null< CXXBoolLiteralExpr >( returnstmt->getRetValue()))
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{
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if( boolliteral->getValue() == false )
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{ // It is, modify the false to true using LO plugin helper function.
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replaceText( boolliteral->getSourceRange(), "maybereturntrue" );
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}
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}
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}
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}
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// Register the plugin action with the LO plugin handling.
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static Plugin::Registration< Tutorial3 > X( "tutorial3" );
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} // namespace
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