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//===-- PrintFlangFunctionNames.cpp ---------------------------------------===// | ||
// | ||
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. | ||
// See https://llvm.org/LICENSE.txt for license information. | ||
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception | ||
// | ||
//===----------------------------------------------------------------------===// | ||
// | ||
// Small example Flang plugin to count/print Functions & Subroutines names. | ||
// It walks the Parse Tree using a Visitor struct that has Post functions for | ||
// FunctionStmt and SubroutineStmt to access the names of functions & | ||
// subroutines. It also has Pre functions for FunctionSubprogram and | ||
// SubroutineSubprogram so a Bool can be set to show that it is the definition | ||
// of a function/subroutine, and not print those that are in an Interface. | ||
// This plugin does not recognise Statement Functions or Module Procedures, | ||
// which could be dealt with through StmtFunctionStmt and MpSubprogramStmt nodes | ||
// respectively. | ||
// | ||
//===----------------------------------------------------------------------===// | ||
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#include "flang/Frontend/FrontendActions.h" | ||
#include "flang/Frontend/FrontendPluginRegistry.h" | ||
#include "flang/Parser/dump-parse-tree.h" | ||
#include "flang/Parser/parsing.h" | ||
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using namespace Fortran::frontend; | ||
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class PrintFunctionNamesAction : public PluginParseTreeAction { | ||
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// Visitor struct that defines Pre/Post functions for different types of nodes | ||
struct ParseTreeVisitor { | ||
template <typename A> bool Pre(const A &) { return true; } | ||
template <typename A> void Post(const A &) {} | ||
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bool Pre(const Fortran::parser::FunctionSubprogram &) { | ||
isInSubprogram_ = true; | ||
return true; | ||
} | ||
void Post(const Fortran::parser::FunctionStmt &f) { | ||
if (isInSubprogram_) { | ||
llvm::outs() << "Function:\t" | ||
<< std::get<Fortran::parser::Name>(f.t).ToString() << "\n"; | ||
fcounter++; | ||
isInSubprogram_ = false; | ||
} | ||
} | ||
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bool Pre(const Fortran::parser::SubroutineSubprogram &) { | ||
isInSubprogram_ = true; | ||
return true; | ||
} | ||
void Post(const Fortran::parser::SubroutineStmt &s) { | ||
if (isInSubprogram_) { | ||
llvm::outs() << "Subroutine:\t" | ||
<< std::get<Fortran::parser::Name>(s.t).ToString() << "\n"; | ||
scounter++; | ||
isInSubprogram_ = false; | ||
} | ||
} | ||
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int fcounter{0}; | ||
int scounter{0}; | ||
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private: | ||
bool isInSubprogram_{false}; | ||
}; | ||
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void executeAction() override { | ||
ParseTreeVisitor visitor; | ||
Fortran::parser::Walk(getParsing().parseTree(), visitor); | ||
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llvm::outs() << "\n==== Functions: " << visitor.fcounter << " ====\n"; | ||
llvm::outs() << "==== Subroutines: " << visitor.scounter << " ====\n"; | ||
} | ||
}; | ||
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static FrontendPluginRegistry::Add<PrintFunctionNamesAction> X( | ||
"print-fns", "Print Function names"); |