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llvm-6502/include/llvm/PassSupport.h
2009-03-02 12:42:07 +00:00

257 lines
9.3 KiB
C++

//===- llvm/PassSupport.h - Pass Support code -------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file 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 {
public:
typedef Pass* (*NormalCtor_t)();
private:
const char *const PassName; // Nice name for Pass
const char *const PassArgument; // Command Line argument to run this pass
const intptr_t PassID;
const bool IsCFGOnlyPass; // Pass only looks at the CFG.
const bool IsAnalysis; // True if an analysis pass.
const bool IsAnalysisGroup; // True if an analysis group.
std::vector<const PassInfo*> ItfImpl;// Interfaces implemented by this pass
NormalCtor_t NormalCtor;
public:
/// PassInfo ctor - Do not call this directly, this should only be invoked
/// through RegisterPass.
PassInfo(const char *name, const char *arg, intptr_t pi,
NormalCtor_t normal = 0,
bool isCFGOnly = false, bool is_analysis = false)
: PassName(name), PassArgument(arg), PassID(pi),
IsCFGOnlyPass(isCFGOnly),
IsAnalysis(is_analysis), IsAnalysisGroup(false), NormalCtor(normal) {
registerPass();
}
/// PassInfo ctor - Do not call this directly, this should only be invoked
/// through RegisterPass. This version is for use by analysis groups; it
/// does not auto-register the pass.
PassInfo(const char *name, intptr_t pi)
: PassName(name), PassArgument(""), PassID(pi),
IsCFGOnlyPass(false),
IsAnalysis(false), IsAnalysisGroup(true), NormalCtor(0) {
}
/// getPassName - Return the friendly name for the pass, never returns null
///
const char *getPassName() const { return PassName; }
/// 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 id object for the pass...
/// TODO : Rename
intptr_t getTypeInfo() const { return PassID; }
/// isAnalysisGroup - Return true if this is an analysis group, not a normal
/// pass.
///
bool isAnalysisGroup() const { return IsAnalysisGroup; }
bool isAnalysis() const { return IsAnalysis; }
/// isCFGOnlyPass - return true if this pass only looks at the CFG for the
/// function.
bool isCFGOnlyPass() const { return IsCFGOnlyPass; }
/// 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.
///
NormalCtor_t getNormalCtor() const {
return NormalCtor;
}
void setNormalCtor(NormalCtor_t Ctor) {
NormalCtor = Ctor;
}
/// createPass() - Use this method to create an instance of this pass.
Pass *createPass() const {
assert((!isAnalysisGroup() || NormalCtor) &&
"No default implementation found for analysis group!");
assert(NormalCtor &&
"Cannot call createPass on PassInfo without default ctor!");
return NormalCtor();
}
/// 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;
}
protected:
void registerPass();
void unregisterPass();
private:
void operator=(const PassInfo &); // do not implement
PassInfo(const PassInfo &); // do not implement
};
template<typename PassName>
Pass *callDefaultCtor() { return new PassName(); }
//===---------------------------------------------------------------------------
/// 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:
///
/// static RegisterPass<PassClassName> tmp("passopt", "My Name");
///
template<typename passName>
struct RegisterPass : public PassInfo {
// Register Pass using default constructor...
RegisterPass(const char *PassArg, const char *Name, bool CFGOnly = false,
bool is_analysis = false)
: PassInfo(Name, PassArg, intptr_t(&passName::ID),
PassInfo::NormalCtor_t(callDefaultCtor<passName>),
CFGOnly, is_analysis) {
}
};
/// 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 {
PassInfo *InterfaceInfo;
const PassInfo *ImplementationInfo;
bool isDefaultImplementation;
protected:
explicit RegisterAGBase(const char *Name,
intptr_t InterfaceID,
intptr_t PassID = 0,
bool isDefault = false);
};
template<typename Interface, bool Default = false>
struct RegisterAnalysisGroup : public RegisterAGBase {
explicit RegisterAnalysisGroup(PassInfo &RPB)
: RegisterAGBase(RPB.getPassName(),
intptr_t(&Interface::ID), RPB.getTypeInfo(),
Default) {
}
explicit RegisterAnalysisGroup(const char *Name)
: RegisterAGBase(Name, intptr_t(&Interface::ID)) {
}
};
//===---------------------------------------------------------------------------
/// 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 *) {}
/// 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 llvm namespace
#endif