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/*
* 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
- etc.
*/
#include "plugin.hxx"
namespace loplugin
{
class ChangeFunctionCalls
: public RecursiveASTVisitor< ChangeFunctionCalls >
, public RewritePlugin
{
public:
explicit ChangeFunctionCalls( CompilerInstance& compiler, Rewriter& rewriter );
virtual void run() override;
bool VisitCallExpr( const CallExpr* call );
};
ChangeFunctionCalls::ChangeFunctionCalls( CompilerInstance& compiler, Rewriter& rewriter )
: RewritePlugin( compiler, rewriter )
{
}
void ChangeFunctionCalls::run()
{
TraverseDecl( compiler.getASTContext().getTranslationUnitDecl());
}
bool ChangeFunctionCalls::VisitCallExpr( const CallExpr* call )
{
if( ignoreLocation( call ))
return true;
if( const FunctionDecl* func = call->getDirectCallee())
{
// Optimize, getQualifiedNameAsString() is reportedly expensive,
// 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" ))
{
string qualifiedName = func->getQualifiedNameAsString();
if( qualifiedName == "bar" )
{
// 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
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