LegacyPassNameParser.h

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//===- LegacyPassNameParser.h -----------------------------------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// This file contains the PassNameParser and FilteredPassNameParser<> classes,
// which are used to add command line arguments to a utility for all of the
// passes that have been registered into the system.
//
// The PassNameParser class adds ALL passes linked into the system (that are
// creatable) as command line arguments to the tool (when instantiated with the
// appropriate command line option template).  The FilteredPassNameParser<>
// template is used for the same purposes as PassNameParser, except that it only
// includes passes that have a PassType that are compatible with the filter
// (which is the template argument).
//
// Note that this is part of the legacy pass manager infrastructure and will be
// (eventually) going away.
//
//===----------------------------------------------------------------------===//
 
#ifndef LLVM_IR_LEGACYPASSNAMEPARSER_H
#define LLVM_IR_LEGACYPASSNAMEPARSER_H
 
#include "llvm/ADT/STLExtras.h"
#include "llvm/Pass.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
#include <cstring>
 
namespace llvm {
 
//===----------------------------------------------------------------------===//
// PassNameParser class - Make use of the pass registration mechanism to
// automatically add a command line argument to opt for each pass.
//
class PassNameParser : public PassRegistrationListener,
                       public cl::parser<const PassInfo*> {
public:
  PassNameParser(cl::Option &O);
  ~PassNameParser() override;
 
  void initialize() {
    cl::parser<const PassInfo*>::initialize();
 
    // Add all of the passes to the map that got initialized before 'this' did.
    enumeratePasses();
  }
 
  // ignorablePassImpl - Can be overriden in subclasses to refine the list of
  // which passes we want to include.
  //
  virtual bool ignorablePassImpl(const PassInfo *P) const { return false; }
 
  inline bool ignorablePass(const PassInfo *P) const {
    // Ignore non-selectable and non-constructible passes!  Ignore
    // non-optimizations.
    return P->getPassArgument().empty() || P->getNormalCtor() == nullptr ||
           ignorablePassImpl(P);
  }
 
  // Implement the PassRegistrationListener callbacks used to populate our map
  //
  void passRegistered(const PassInfo *P) override {
    if (ignorablePass(P)) return;
    if (findOption(P->getPassArgument().data()) != getNumOptions()) {
      errs() << "Two passes with the same argument (-"
           << P->getPassArgument() << ") attempted to be registered!\n";
      llvm_unreachable(nullptr);
    }
    addLiteralOption(P->getPassArgument().data(), P, P->getPassName().data());
  }
  void passEnumerate(const PassInfo *P) override { passRegistered(P); }
 
  // printOptionInfo - Print out information about this option.  Override the
  // default implementation to sort the table before we print...
  void printOptionInfo(const cl::Option &O, size_t GlobalWidth) const override {
    PassNameParser *PNP = const_cast<PassNameParser*>(this);
    array_pod_sort(PNP->Values.begin(), PNP->Values.end(), ValCompare);
    cl::parser<const PassInfo*>::printOptionInfo(O, GlobalWidth);
  }
 
private:
  // ValCompare - Provide a sorting comparator for Values elements...
  static int ValCompare(const PassNameParser::OptionInfo *VT1,
                        const PassNameParser::OptionInfo *VT2) {
    return VT1->Name.compare(VT2->Name);
  }
};
 
} // End llvm namespace
 
#endif