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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.
*
*/
/*
This is a rewriter.
Changes all calls to a specific function (after it's been renamed or its
arguments have changed).
This specific example checks for calls to function 'void bar(unsigned int)'
and adds '+ 10' to the argument (as plain text, so if the argument is a more
complex expression, operator precedence may mean the result is actually different).
This can be easily adjusted for different modifications to a function:
- replace CallExpr with CXXOperatorCallExpr or CXXMemberCallExpr
- check different names or arguments
- change getDirectCallee() to getCallee()
- etc.
*/
#include "plugin.hxx"
#include "check.hxx"
namespace loplugin
{
class ChangeFunctionCalls
: public loplugin::FilteringRewritePlugin< ChangeFunctionCalls >
{
public:
explicit ChangeFunctionCalls( CompilerInstance& compiler, Rewriter& rewriter );
virtual void run() override;
bool VisitCallExpr( const CallExpr* call );
};
ChangeFunctionCalls::ChangeFunctionCalls( CompilerInstance& compiler, Rewriter& rewriter )
: FilteringRewritePlugin( compiler, rewriter )
{
}
void ChangeFunctionCalls::run()
{
TraverseDecl( compiler.getASTContext().getTranslationUnitDecl());
}
bool ChangeFunctionCalls::VisitCallExpr( const CallExpr* call )
{
if( ignoreLocation( call ))
return true;
// Using getDirectCallee() here means that we find only calls
// that call the function directly (i.e. not using a pointer, for example).
// Use getCallee() to include also those :
// if( const FunctionDecl* func = dyn_cast_or_null< FunctionDecl >( call->getCalleeDecl()))
if( const FunctionDecl* func = call->getDirectCallee())
{
// so first check fast details like number of arguments or the (unqualified)
// name before checking the fully qualified name.
// See FunctionDecl for all the API about the function.
if( func->getNumParams() == 1 && func->getIdentifier() != NULL
&& ( func->getName() == "bar" ))
{
auto qt = loplugin::DeclCheck(func);
if( qt.Function("bar").GlobalNamespace() )
{
// Further checks about arguments. Check mainly ParmVarDecl, VarDecl,
// ValueDecl and QualType for Clang API details.
string arg0 = func->getParamDecl( 0 )->getType().getAsString();
if( arg0 == "unsigned int" )
{
insertTextAfterToken( call->getArg( 0 )->getLocEnd(), " + 10" );
report( DiagnosticsEngine::Warning, "found", call->getLocStart());
}
}
}
}
return true;
}
static Plugin::Registration< ChangeFunctionCalls > X( "changefunctioncalls" );
} // namespace
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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