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//===-- llvm/Target/TargetMachine.h - Target Information --------*- 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 describes the general parts of a Target machine.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_TARGET_TARGETMACHINE_H
#define LLVM_TARGET_TARGETMACHINE_H
#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetInstrItineraries.h"
#include <cassert>
namespace llvm {
class TargetSubtarget;
class TargetInstrInfo;
class TargetInstrDescriptor;
class TargetJITInfo;
class TargetLowering;
class TargetFrameInfo;
class MachineCodeEmitter;
class MRegisterInfo;
class FunctionPassManager;
class PassManager;
class Pass;
// Relocation model types.
namespace Reloc {
enum Model {
Default,
Static,
PIC,
DynamicNoPIC
};
}
//===----------------------------------------------------------------------===//
///
/// TargetMachine - Primary interface to the complete machine description for
/// the target machine. All target-specific information should be accessible
/// through this interface.
///
class TargetMachine {
const std::string Name;
TargetMachine(const TargetMachine&); // DO NOT IMPLEMENT
void operator=(const TargetMachine&); // DO NOT IMPLEMENT
protected: // Can only create subclasses...
TargetMachine(const std::string &name) : Name(name) { };
/// This constructor is used for targets that support arbitrary TargetData
/// layouts, like the C backend. It initializes the TargetData to match that
/// of the specified module.
///
TargetMachine(const std::string &name, const Module &M);
/// getSubtargetImpl - virtual method implemented by subclasses that returns
/// a reference to that target's TargetSubtarget-derived member variable.
virtual const TargetSubtarget *getSubtargetImpl() const { return 0; }
public:
virtual ~TargetMachine();
/// getModuleMatchQuality - This static method should be implemented by
/// targets to indicate how closely they match the specified module. This is
/// used by the LLC tool to determine which target to use when an explicit
/// -march option is not specified. If a target returns zero, it will never
/// be chosen without an explicit -march option.
static unsigned getModuleMatchQuality(const Module &M) { return 0; }
/// getJITMatchQuality - This static method should be implemented by targets
/// that provide JIT capabilities to indicate how suitable they are for
/// execution on the current host. If a value of 0 is returned, the target
/// will not be used unless an explicit -march option is used.
static unsigned getJITMatchQuality() { return 0; }
const std::string &getName() const { return Name; }
// Interfaces to the major aspects of target machine information:
// -- Instruction opcode and operand information
// -- Pipelines and scheduling information
// -- Stack frame information
// -- Selection DAG lowering information
//
virtual const TargetInstrInfo *getInstrInfo() const { return 0; }
virtual const TargetFrameInfo *getFrameInfo() const { return 0; }
virtual TargetLowering *getTargetLowering() const { return 0; }
virtual const TargetData *getTargetData() const { return 0; }
/// getSubtarget - This method returns a pointer to the specified type of
/// TargetSubtarget. In debug builds, it verifies that the object being
/// returned is of the correct type.
template<typename STC> const STC &getSubtarget() const {
const TargetSubtarget *TST = getSubtargetImpl();
assert(TST && dynamic_cast<const STC*>(TST) &&
"Not the right kind of subtarget!");
return *static_cast<const STC*>(TST);
}
/// getRegisterInfo - If register information is available, return it. If
/// not, return null. This is kept separate from RegInfo until RegInfo has
/// details of graph coloring register allocation removed from it.
///
virtual const MRegisterInfo* getRegisterInfo() const { return 0; }
/// getJITInfo - If this target supports a JIT, return information for it,
/// otherwise return null.
///
virtual TargetJITInfo *getJITInfo() { return 0; }
/// getInstrItineraryData - Returns instruction itinerary data for the target
/// or specific subtarget.
///
virtual const InstrItineraryData getInstrItineraryData() const {
return InstrItineraryData();
}
/// getRelocationModel - Returns the code generation relocation model. The
/// choices are static, PIC, and dynamic-no-pic, and target default.
static Reloc::Model getRelocationModel();
/// setRelocationModel - Sets the code generation relocation model.
static void setRelocationModel(Reloc::Model Model);
/// CodeGenFileType - These enums are meant to be passed into
/// addPassesToEmitFile to indicate what type of file to emit.
enum CodeGenFileType {
AssemblyFile, ObjectFile, DynamicLibrary
};
/// addPassesToEmitFile - Add passes to the specified pass manager to get
/// the specified file emitted. Typically this will involve several steps of
/// code generation. If Fast is set to true, the code generator should emit
/// code as fast as possible, without regard for compile time. This method
/// should return true if emission of this file type is not supported.
///
virtual bool addPassesToEmitFile(PassManager &PM, std::ostream &Out,
CodeGenFileType FileType, bool Fast) {
return true;
}
/// addPassesToEmitMachineCode - Add passes to the specified pass manager to
/// get machine code emitted. This uses a MachineCodeEmitter object to handle
/// actually outputting the machine code and resolving things like the address
/// of functions. This method should returns true if machine code emission is
/// not supported.
///
virtual bool addPassesToEmitMachineCode(FunctionPassManager &PM,
MachineCodeEmitter &MCE) {
return true;
}
};
} // End llvm namespace
#endif
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