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//===-- Target/TargetMachineRegistry.h - Target Registration ----*- 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 exposes two classes: the TargetMachineRegistry class, which allows
// tools to inspect all of registered targets, and the RegisterTarget class,
// which TargetMachine implementations should use to register themselves with
// the system.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_TARGET_TARGETMACHINEREGISTRY_H
#define LLVM_TARGET_TARGETMACHINEREGISTRY_H
#include "llvm/Support/CommandLine.h"
namespace llvm {
class Module;
class TargetMachine;
struct TargetMachineRegistry {
struct Entry;
/// TargetMachineRegistry::getList - This static method returns the list of
/// target machines that are registered with the system.
static const Entry *getList() { return List; }
/// getClosestStaticTargetForModule - Given an LLVM module, pick the best
/// target that is compatible with the module. If no close target can be
/// found, this returns null and sets the Error string to a reason.
static const Entry *getClosestStaticTargetForModule(const Module &M,
std::string &Error);
/// getClosestTargetForJIT - Given an LLVM module, pick the best target that
/// is compatible with the current host and the specified module. If no
/// close target can be found, this returns null and sets the Error string
/// to a reason.
static const Entry *getClosestTargetForJIT(std::string &Error);
/// Entry - One instance of this struct is created for each target that is
/// registered.
struct Entry {
const char *Name;
const char *ShortDesc;
TargetMachine *(*CtorFn)(const Module &, const std::string &);
unsigned (*ModuleMatchQualityFn)(const Module &M);
unsigned (*JITMatchQualityFn)();
const Entry *getNext() const { return Next; }
protected:
Entry(const char *N, const char *SD,
TargetMachine *(*CF)(const Module &, const std::string &),
unsigned (*MMF)(const Module &M), unsigned (*JMF)());
private:
const Entry *Next; // Next entry in the linked list.
};
private:
static const Entry *List;
};
//===--------------------------------------------------------------------===//
/// RegisterTarget - This class is used to make targets automatically register
/// themselves with the tool they are linked. Targets should define an
/// instance of this and implement the static methods described in the
/// TargetMachine comments.
/// The type 'TargetMachineImpl' should provide a constructor with two
/// parameters:
/// - const Module& M: the module that is being compiled:
/// - const std::string& FS: target-specific string describing target
/// flavour.
template<class TargetMachineImpl>
struct RegisterTarget : public TargetMachineRegistry::Entry {
RegisterTarget(const char *Name, const char *ShortDesc) :
TargetMachineRegistry::Entry(Name, ShortDesc, &Allocator,
&TargetMachineImpl::getModuleMatchQuality,
&TargetMachineImpl::getJITMatchQuality) {
}
private:
static TargetMachine *Allocator(const Module &M, const std::string &FS) {
return new TargetMachineImpl(M, FS);
}
};
/// TargetRegistrationListener - This class allows code to listen for targets
/// that are dynamically registered, and be notified of it when they are.
class TargetRegistrationListener {
TargetRegistrationListener **Prev, *Next;
public:
TargetRegistrationListener();
virtual ~TargetRegistrationListener();
TargetRegistrationListener *getNext() const { return Next; }
virtual void targetRegistered(const TargetMachineRegistry::Entry *E) = 0;
};
//===--------------------------------------------------------------------===//
/// TargetNameParser - This option can be used to provide a command line
/// option to choose among the various registered targets (commonly -march).
class TargetNameParser : public TargetRegistrationListener,
public cl::parser<const TargetMachineRegistry::Entry*> {
public:
void initialize(cl::Option &O) {
for (const TargetMachineRegistry::Entry *E =
TargetMachineRegistry::getList(); E; E = E->getNext())
Values.push_back(std::make_pair(E->Name,
std::make_pair(E, E->ShortDesc)));
cl::parser<const TargetMachineRegistry::Entry*>::initialize(O);
}
virtual void targetRegistered(const TargetMachineRegistry::Entry *E) {
Values.push_back(std::make_pair(E->Name,
std::make_pair(E, E->ShortDesc)));
}
};
}
#endif
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