PassSupport.h

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//===- llvm/PassSupport.h - Pass Support code -------------------*- 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 defines stuff that is used to define and "use" Passes.  This file
// is automatically #included by Pass.h, so:
//
//           NO .CPP FILES SHOULD INCLUDE THIS FILE DIRECTLY
//
// Instead, #include Pass.h.
//
// This file defines Pass registration code and classes used for it.
//
//===----------------------------------------------------------------------===//
 
#if !defined(LLVM_PASS_H) || defined(LLVM_PASSSUPPORT_H)
#error "Do not include <PassSupport.h>; include <Pass.h> instead"
#endif
 
#ifndef LLVM_PASSSUPPORT_H
#define LLVM_PASSSUPPORT_H
 
#include "llvm/ADT/StringRef.h"
#include "llvm/PassInfo.h"
#include "llvm/PassRegistry.h"
#include "llvm/Support/Error.h"
#include "llvm/Support/Threading.h"
#include <functional>
 
namespace llvm {
 
class Pass;
 
#define INITIALIZE_PASS(passName, arg, name, cfg, analysis)                    \
  static void *initialize##passName##PassOnce(PassRegistry &Registry) {        \
    PassInfo *PI = new PassInfo(                                               \
        name, arg, &passName::ID,                                              \
        PassInfo::NormalCtor_t(callDefaultCtor<passName>), cfg, analysis);     \
    Registry.registerPass(*PI, true);                                          \
    return PI;                                                                 \
  }                                                                            \
  static llvm::once_flag Initialize##passName##PassFlag;                       \
  void llvm::initialize##passName##Pass(PassRegistry &Registry) {              \
    llvm::call_once(Initialize##passName##PassFlag,                            \
                    initialize##passName##PassOnce, std::ref(Registry));       \
  }
 
#define INITIALIZE_PASS_BEGIN(passName, arg, name, cfg, analysis)              \
  static void *initialize##passName##PassOnce(PassRegistry &Registry) {
 
#define INITIALIZE_PASS_DEPENDENCY(depName) initialize##depName##Pass(Registry);
#define INITIALIZE_AG_DEPENDENCY(depName)                                      \
  initialize##depName##AnalysisGroup(Registry);
 
#define INITIALIZE_PASS_END(passName, arg, name, cfg, analysis)                \
  PassInfo *PI = new PassInfo(                                                 \
      name, arg, &passName::ID,                                                \
      PassInfo::NormalCtor_t(callDefaultCtor<passName>), cfg, analysis);       \
  Registry.registerPass(*PI, true);                                            \
  return PI;                                                                   \
  }                                                                            \
  static llvm::once_flag Initialize##passName##PassFlag;                       \
  void llvm::initialize##passName##Pass(PassRegistry &Registry) {              \
    llvm::call_once(Initialize##passName##PassFlag,                            \
                    initialize##passName##PassOnce, std::ref(Registry));       \
  }
 
#define INITIALIZE_PASS_WITH_OPTIONS(PassName, Arg, Name, Cfg, Analysis)       \
  INITIALIZE_PASS_BEGIN(PassName, Arg, Name, Cfg, Analysis)                    \
  PassName::registerOptions();                                                 \
  INITIALIZE_PASS_END(PassName, Arg, Name, Cfg, Analysis)
 
#define INITIALIZE_PASS_WITH_OPTIONS_BEGIN(PassName, Arg, Name, Cfg, Analysis) \
  INITIALIZE_PASS_BEGIN(PassName, Arg, Name, Cfg, Analysis)                    \
  PassName::registerOptions();
 
template <
    class PassName,
    std::enable_if_t<std::is_default_constructible<PassName>{}, bool> = true>
Pass *callDefaultCtor() {
  return new PassName();
}
 
template <
    class PassName,
    std::enable_if_t<!std::is_default_constructible<PassName>{}, bool> = true>
Pass *callDefaultCtor() {
  // Some codegen passes should only be testable via
  // `llc -{start|stop}-{before|after}=<passname>`, not via `opt -<passname>`.
  report_fatal_error("target-specific codegen-only pass");
}
 
//===---------------------------------------------------------------------------
/// RegisterPass<t> template - This template class is used to notify the system
/// that a Pass is available for use, and registers it into the internal
/// database maintained by the PassManager.  Unless this template is used, opt,
/// for example will not be able to see the pass and attempts to create the pass
/// will fail. This template is used in the follow manner (at global scope, in
/// your .cpp file):
///
/// static RegisterPass<YourPassClassName> tmp("passopt", "My Pass Name");
///
/// This statement will cause your pass to be created by calling the default
/// constructor exposed by the pass.
template <typename passName> struct RegisterPass : public PassInfo {
  // Register Pass using default constructor...
  RegisterPass(StringRef PassArg, StringRef Name, bool CFGOnly = false,
               bool is_analysis = false)
      : PassInfo(Name, PassArg, &passName::ID,
                 PassInfo::NormalCtor_t(callDefaultCtor<passName>), CFGOnly,
                 is_analysis) {
    PassRegistry::getPassRegistry()->registerPass(*this);
  }
};
 
/// RegisterAnalysisGroup - Register a Pass as a member of an analysis _group_.
/// Analysis groups are used to define an interface (which need not derive from
/// Pass) that is required by passes to do their job.  Analysis Groups differ
/// from normal analyses because any available implementation of the group will
/// be used if it is available.
///
/// If no analysis implementing the interface is available, a default
/// implementation is created and added.  A pass registers itself as the default
/// implementation by specifying 'true' as the second template argument of this
/// class.
///
/// In addition to registering itself as an analysis group member, a pass must
/// register itself normally as well.  Passes may be members of multiple groups
/// and may still be "required" specifically by name.
///
/// The actual interface may also be registered as well (by not specifying the
/// second template argument).  The interface should be registered to associate
/// a nice name with the interface.
class RegisterAGBase : public PassInfo {
public:
  RegisterAGBase(StringRef Name, const void *InterfaceID,
                 const void *PassID = nullptr, bool isDefault = false);
};
 
template <typename Interface, bool Default = false>
struct RegisterAnalysisGroup : public RegisterAGBase {
  explicit RegisterAnalysisGroup(PassInfo &RPB)
      : RegisterAGBase(RPB.getPassName(), &Interface::ID, RPB.getTypeInfo(),
                       Default) {}
 
  explicit RegisterAnalysisGroup(const char *Name)
      : RegisterAGBase(Name, &Interface::ID) {}
};
 
#define INITIALIZE_ANALYSIS_GROUP(agName, name, defaultPass)                   \
  static void *initialize##agName##AnalysisGroupOnce(PassRegistry &Registry) { \
    initialize##defaultPass##Pass(Registry);                                   \
    PassInfo *AI = new PassInfo(name, &agName::ID);                            \
    Registry.registerAnalysisGroup(&agName::ID, 0, *AI, false, true);          \
    return AI;                                                                 \
  }                                                                            \
  static llvm::once_flag Initialize##agName##AnalysisGroupFlag;                \
  void llvm::initialize##agName##AnalysisGroup(PassRegistry &Registry) {       \
    llvm::call_once(Initialize##agName##AnalysisGroupFlag,                     \
                    initialize##agName##AnalysisGroupOnce,                     \
                    std::ref(Registry));                                       \
  }
 
#define INITIALIZE_AG_PASS(passName, agName, arg, name, cfg, analysis, def)    \
  static void *initialize##passName##PassOnce(PassRegistry &Registry) {        \
    if (!def)                                                                  \
      initialize##agName##AnalysisGroup(Registry);                             \
    PassInfo *PI = new PassInfo(                                               \
        name, arg, &passName::ID,                                              \
        PassInfo::NormalCtor_t(callDefaultCtor<passName>), cfg, analysis);     \
    Registry.registerPass(*PI, true);                                          \
                                                                               \
    PassInfo *AI = new PassInfo(name, &agName::ID);                            \
    Registry.registerAnalysisGroup(&agName::ID, &passName::ID, *AI, def,       \
                                   true);                                      \
    return AI;                                                                 \
  }                                                                            \
  static llvm::once_flag Initialize##passName##PassFlag;                       \
  void llvm::initialize##passName##Pass(PassRegistry &Registry) {              \
    llvm::call_once(Initialize##passName##PassFlag,                            \
                    initialize##passName##PassOnce, std::ref(Registry));       \
  }
 
#define INITIALIZE_AG_PASS_BEGIN(passName, agName, arg, n, cfg, analysis, def) \
  static void *initialize##passName##PassOnce(PassRegistry &Registry) {        \
    if (!def)                                                                  \
      initialize##agName##AnalysisGroup(Registry);
 
#define INITIALIZE_AG_PASS_END(passName, agName, arg, n, cfg, analysis, def)   \
  PassInfo *PI = new PassInfo(                                                 \
      n, arg, &passName::ID,                                                   \
      PassInfo::NormalCtor_t(callDefaultCtor<passName>), cfg, analysis);       \
  Registry.registerPass(*PI, true);                                            \
                                                                               \
  PassInfo *AI = new PassInfo(n, &agName::ID);                                 \
  Registry.registerAnalysisGroup(&agName::ID, &passName::ID, *AI, def, true);  \
  return AI;                                                                   \
  }                                                                            \
  static llvm::once_flag Initialize##passName##PassFlag;                       \
  void llvm::initialize##passName##Pass(PassRegistry &Registry) {              \
    llvm::call_once(Initialize##passName##PassFlag,                            \
                    initialize##passName##PassOnce, std::ref(Registry));       \
  }
 
//===---------------------------------------------------------------------------
/// PassRegistrationListener class - This class is meant to be derived from by
/// clients that are interested in which passes get registered and unregistered
/// at runtime (which can be because of the RegisterPass constructors being run
/// as the program starts up, or may be because a shared object just got
/// loaded).
struct PassRegistrationListener {
  PassRegistrationListener() = default;
  virtual ~PassRegistrationListener() = default;
 
  /// Callback functions - These functions are invoked whenever a pass is loaded
  /// or removed from the current executable.
  virtual void passRegistered(const PassInfo *) {}
 
  /// enumeratePasses - Iterate over the registered passes, calling the
  /// passEnumerate callback on each PassInfo object.
  void enumeratePasses();
 
  /// passEnumerate - Callback function invoked when someone calls
  /// enumeratePasses on this PassRegistrationListener object.
  virtual void passEnumerate(const PassInfo *) {}
};
 
} // end namespace llvm
 
#endif // LLVM_PASSSUPPORT_H