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llvm-mirror/include/llvm/PassSupport.h

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//===- llvm/PassSupport.h - Pass Support code -------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// 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.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_PASS_SUPPORT_H
#define LLVM_PASS_SUPPORT_H
// No need to include Pass.h, we are being included by it!
namespace llvm {
class TargetMachine;
//===---------------------------------------------------------------------------
/// PassInfo class - An instance of this class exists for every pass known by
/// the system, and can be obtained from a live Pass by calling its
/// getPassInfo() method. These objects are set up by the RegisterPass<>
/// template, defined below.
///
class PassInfo {
const char *PassName; // Nice name for Pass
const char *PassArgument; // Command Line argument to run this pass
const std::type_info &TypeInfo; // type_info object for this Pass class
unsigned char PassType; // Set of enums values below...
std::vector<const PassInfo*> ItfImpl;// Interfaces implemented by this pass
Pass *(*NormalCtor)(); // No argument ctor
Pass *(*TargetCtor)(TargetMachine&); // Ctor taking TargetMachine object...
public:
/// PassType - Define symbolic constants that can be used to test to see if
/// this pass should be listed by analyze or opt. Passes can use none, one or
/// many of these flags or'd together. It is not legal to combine the
/// AnalysisGroup flag with others.
///
enum {
Analysis = 1, Optimization = 2, AnalysisGroup = 4
};
/// PassInfo ctor - Do not call this directly, this should only be invoked
/// through RegisterPass.
PassInfo(const char *name, const char *arg, const std::type_info &ti,
unsigned char pt, Pass *(*normal)() = 0,
Pass *(*targetctor)(TargetMachine &) = 0)
: PassName(name), PassArgument(arg), TypeInfo(ti), PassType(pt),
NormalCtor(normal), TargetCtor(targetctor) {
}
/// getPassName - Return the friendly name for the pass, never returns null
///
const char *getPassName() const { return PassName; }
void setPassName(const char *Name) { PassName = Name; }
/// getPassArgument - Return the command line option that may be passed to
/// 'opt' that will cause this pass to be run. This will return null if there
/// is no argument.
///
const char *getPassArgument() const { return PassArgument; }
/// getTypeInfo - Return the type_info object for the pass...
///
const std::type_info &getTypeInfo() const { return TypeInfo; }
/// getPassType - Return the PassType of a pass. Note that this can be
/// several different types or'd together. This is _strictly_ for use by opt,
/// analyze and llc for deciding which passes to use as command line options.
///
unsigned getPassType() const { return PassType; }
/// getNormalCtor - Return a pointer to a function, that when called, creates
/// an instance of the pass and returns it. This pointer may be null if there
/// is no default constructor for the pass.
///
Pass *(*getNormalCtor() const)() {
return NormalCtor;
}
void setNormalCtor(Pass *(*Ctor)()) {
NormalCtor = Ctor;
}
/// createPass() - Use this method to create an instance of this pass.
Pass *createPass() const {
assert((PassType != AnalysisGroup || NormalCtor) &&
"No default implementation found for analysis group!");
assert(NormalCtor &&
"Cannot call createPass on PassInfo without default ctor!");
return NormalCtor();
}
/// getTargetCtor - Return a pointer to a function that creates an instance of
/// the pass and returns it. This returns a constructor for a version of the
/// pass that takes a TargetMachine object as a parameter.
///
Pass *(*getTargetCtor() const)(TargetMachine &) {
return TargetCtor;
}
/// addInterfaceImplemented - This method is called when this pass is
/// registered as a member of an analysis group with the RegisterAnalysisGroup
/// template.
///
void addInterfaceImplemented(const PassInfo *ItfPI) {
ItfImpl.push_back(ItfPI);
}
/// getInterfacesImplemented - Return a list of all of the analysis group
/// interfaces implemented by this pass.
///
const std::vector<const PassInfo*> &getInterfacesImplemented() const {
return ItfImpl;
}
};
//===---------------------------------------------------------------------------
/// 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. If you have a different constructor that
/// must be called, create a global constructor function (which takes the
/// arguments you need and returns a Pass*) and register your pass like this:
///
/// Pass *createMyPass(foo &opt) { return new MyPass(opt); }
/// static RegisterPass<PassClassName> tmp("passopt", "My Name", createMyPass);
///
struct RegisterPassBase {
/// getPassInfo - Get the pass info for the registered class...
///
const PassInfo *getPassInfo() const { return &PIObj; }
RegisterPassBase(const char *Name, const char *Arg, const std::type_info &TI,
unsigned char PT, Pass *(*Normal)() = 0,
Pass *(*TargetCtor)(TargetMachine &) = 0)
: PIObj(Name, Arg, TI, PT, Normal, TargetCtor) {
registerPass();
}
RegisterPassBase(const std::type_info &TI, unsigned char PT)
: PIObj("", "", TI, PT, 0, 0) {
// This ctor may only be used for analysis groups: it does not auto-register
// the pass.
assert(PT == PassInfo::AnalysisGroup && "Not an AnalysisGroup!");
}
~RegisterPassBase() { // Intentionally non-virtual.
// Analysis groups are registered/unregistered by their dtor.
if (PIObj.getPassType() != PassInfo::AnalysisGroup)
unregisterPass();
}
protected:
PassInfo PIObj; // The PassInfo object for this pass
void registerPass();
void unregisterPass();
/// setOnlyUsesCFG - Notice that this pass only depends on the CFG, so
/// transformations that do not modify the CFG do not invalidate this pass.
///
void setOnlyUsesCFG();
};
template<typename PassName>
Pass *callDefaultCtor() { return new PassName(); }
template<typename PassName>
struct RegisterPass : public RegisterPassBase {
// Register Pass using default constructor...
RegisterPass(const char *PassArg, const char *Name, unsigned char PassTy = 0)
: RegisterPassBase(Name, PassArg, typeid(PassName), PassTy,
callDefaultCtor<PassName>) {}
// Register Pass using default constructor explicitly...
2004-06-04 22:39:05 +02:00
RegisterPass(const char *PassArg, const char *Name, unsigned char PassTy,
Pass *(*ctor)())
: RegisterPassBase(Name, PassArg, typeid(PassName), PassTy, ctor) {}
// Register Pass using TargetMachine constructor...
2004-06-04 22:39:05 +02:00
RegisterPass(const char *PassArg, const char *Name, unsigned char PassTy,
Pass *(*targetctor)(TargetMachine &))
: RegisterPassBase(Name, PassArg, typeid(PassName), PassTy,
0, targetctor) {}
// Generic constructor version that has an unknown ctor type...
template<typename CtorType>
2004-06-04 22:39:05 +02:00
RegisterPass(const char *PassArg, const char *Name, unsigned char PassTy,
CtorType *Fn)
: RegisterPassBase(Name, PassArg, typeid(PassName), PassTy, 0) {}
};
/// RegisterOpt - Register something that is to show up in Opt, this is just a
/// shortcut for specifying RegisterPass...
///
template<typename PassName>
struct RegisterOpt : public RegisterPassBase {
RegisterOpt(const char *PassArg, const char *Name, bool CFGOnly = false)
: RegisterPassBase(Name, PassArg, typeid(PassName), PassInfo::Optimization,
callDefaultCtor<PassName>) {
if (CFGOnly) setOnlyUsesCFG();
}
/// Register Pass using default constructor explicitly...
///
RegisterOpt(const char *PassArg, const char *Name, Pass *(*ctor)(),
bool CFGOnly = false)
: RegisterPassBase(Name, PassArg, typeid(PassName),
PassInfo::Optimization, ctor) {
if (CFGOnly) setOnlyUsesCFG();
}
/// Register FunctionPass using default constructor explicitly...
///
RegisterOpt(const char *PassArg, const char *Name, FunctionPass *(*ctor)(),
bool CFGOnly = false)
: RegisterPassBase(Name, PassArg, typeid(PassName), PassInfo::Optimization,
static_cast<Pass*(*)()>(ctor)) {
if (CFGOnly) setOnlyUsesCFG();
}
/// Register Pass using TargetMachine constructor...
///
RegisterOpt(const char *PassArg, const char *Name,
Pass *(*targetctor)(TargetMachine &), bool CFGOnly = false)
: RegisterPassBase(Name, PassArg, typeid(PassName),
PassInfo::Optimization, 0, targetctor) {
if (CFGOnly) setOnlyUsesCFG();
}
/// Register FunctionPass using TargetMachine constructor...
///
RegisterOpt(const char *PassArg, const char *Name,
FunctionPass *(*targetctor)(TargetMachine &),
bool CFGOnly = false)
: RegisterPassBase(Name, PassArg, typeid(PassName), PassInfo::Optimization, 0,
static_cast<Pass*(*)(TargetMachine&)>(targetctor)) {
if (CFGOnly) setOnlyUsesCFG();
}
};
/// RegisterAnalysis - Register something that is to show up in Analysis, this
/// is just a shortcut for specifying RegisterPass... Analyses take a special
/// argument that, when set to true, tells the system that the analysis ONLY
/// depends on the shape of the CFG, so if a transformation preserves the CFG
/// that the analysis is not invalidated.
///
template<typename PassName>
struct RegisterAnalysis : public RegisterPassBase {
RegisterAnalysis(const char *PassArg, const char *Name,
bool CFGOnly = false)
: RegisterPassBase(Name, PassArg, typeid(PassName), PassInfo::Analysis,
callDefaultCtor<PassName>) {
if (CFGOnly) setOnlyUsesCFG();
}
};
/// 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 third 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 RegisterPassBase {
PassInfo *InterfaceInfo;
const PassInfo *ImplementationInfo;
bool isDefaultImplementation;
protected:
RegisterAGBase(const std::type_info &Interface,
const std::type_info *Pass = 0,
bool isDefault = false);
void setGroupName(const char *Name);
public:
~RegisterAGBase();
};
template<typename Interface, typename DefaultImplementationPass = void,
bool Default = false>
struct RegisterAnalysisGroup : public RegisterAGBase {
RegisterAnalysisGroup() : RegisterAGBase(typeid(Interface),
&typeid(DefaultImplementationPass),
Default) {
}
};
/// Define a specialization of RegisterAnalysisGroup that is used to set the
/// name for the analysis group.
///
template<typename Interface>
struct RegisterAnalysisGroup<Interface, void, false> : public RegisterAGBase {
RegisterAnalysisGroup(const char *Name)
: RegisterAGBase(typeid(Interface)) {
setGroupName(Name);
}
};
//===---------------------------------------------------------------------------
/// 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). Deriving from the PassRegistationListener class automatically
/// registers your object to receive callbacks indicating when passes are loaded
/// and removed.
///
struct PassRegistrationListener {
/// PassRegistrationListener ctor - Add the current object to the list of
/// PassRegistrationListeners...
PassRegistrationListener();
/// dtor - Remove object from list of listeners...
///
virtual ~PassRegistrationListener();
/// Callback functions - These functions are invoked whenever a pass is loaded
/// or removed from the current executable.
///
virtual void passRegistered(const PassInfo *P) {}
virtual void passUnregistered(const PassInfo *P) {}
/// 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 *P) {}
};
//===---------------------------------------------------------------------------
/// IncludeFile class - This class is used as a hack to make sure that the
/// implementation of a header file is included into a tool that uses the
/// header. This is solely to overcome problems linking .a files and not
/// getting the implementation of passes we need.
///
struct IncludeFile {
IncludeFile(void *);
};
} // End llvm namespace
#endif