b8dd396976
Needs work to actually do something useful, but the basics are there. Change-Id: I193922f2f5572760c8c20def0f9b830138f47fef
76 lines
2.1 KiB
C++
76 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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/*
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This is technically a rewriter, but it actually only generates data about code.
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This is incomplete.
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Checks for all function declarations for whether they are used or not. This information
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should be output to files and in a second pass it should be checked (by another tool)
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which functions are never used.
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*/
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#include "plugin.hxx"
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namespace loplugin
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{
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class UnusedCode
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: public RecursiveASTVisitor< UnusedCode >
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, public RewritePlugin
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{
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public:
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explicit UnusedCode( CompilerInstance& compiler, Rewriter& rewriter );
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virtual void run();
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bool VisitFunctionDecl( FunctionDecl* declaration );
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};
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UnusedCode::UnusedCode( CompilerInstance& compiler, Rewriter& rewriter )
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: RewritePlugin( compiler, rewriter )
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{
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}
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void UnusedCode::run()
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{
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TraverseDecl( compiler.getASTContext().getTranslationUnitDecl());
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}
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bool UnusedCode::VisitFunctionDecl( FunctionDecl* declaration )
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{
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if( ignoreLocation( declaration ))
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return true;
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bool isUsed = declaration->isUsed();
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if( CXXMethodDecl* cxxmethod = dyn_cast< CXXMethodDecl >( declaration ))
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{
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if( !isUsed && cxxmethod->isVirtual())
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{ // Virtual methods are used also if a method they override is used.
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for( CXXMethodDecl::method_iterator it = cxxmethod->begin_overridden_methods();
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it != cxxmethod->end_overridden_methods();
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++it )
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{
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if( (*it)->isUsed())
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{
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isUsed = true;
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break;
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}
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}
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}
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}
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// Fully qualified name: declaration->getQualifiedNameAsString()
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// Is used: isUsed
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// The main source file compiled: compiler.getSourceManager().getFileEntryForID( compiler.getSourceManager().getMainFileID())->getName()
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return true;
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}
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static Plugin::Registration< UnusedCode > X( "unusedcode" );
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} // namespace
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