llvm-6502/include/llvm/Target/TargetMachineRegistry.h

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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/Registry.h"
namespace llvm {
class Module;
class TargetMachine;
struct TargetMachineRegistryEntry {
const char *Name;
const char *ShortDesc;
TargetMachine *(*CtorFn)(const Module &, const std::string &);
unsigned (*ModuleMatchQualityFn)(const Module &M);
unsigned (*JITMatchQualityFn)();
public:
TargetMachineRegistryEntry(const char *N, const char *SD,
TargetMachine *(*CF)(const Module &, const std::string &),
unsigned (*MMF)(const Module &M),
unsigned (*JMF)())
: Name(N), ShortDesc(SD), CtorFn(CF), ModuleMatchQualityFn(MMF),
JITMatchQualityFn(JMF) {}
};
template<>
class RegistryTraits<TargetMachine> {
public:
typedef TargetMachineRegistryEntry entry;
static const char *nameof(const entry &Entry) { return Entry.Name; }
static const char *descof(const entry &Entry) { return Entry.ShortDesc; }
};
struct TargetMachineRegistry : public Registry<TargetMachine> {
/// 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 - Pick the best target that is compatible with
/// the current host. 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);
};
//===--------------------------------------------------------------------===//
/// 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 {
RegisterTarget(const char *Name, const char *ShortDesc)
: Entry(Name, ShortDesc, &Allocator,
&TargetMachineImpl::getModuleMatchQuality,
&TargetMachineImpl::getJITMatchQuality),
Node(Entry)
{}
private:
TargetMachineRegistry::entry Entry;
TargetMachineRegistry::node Node;
static TargetMachine *Allocator(const Module &M, const std::string &FS) {
return new TargetMachineImpl(M, FS);
}
};
}
#endif