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llvm-mirror/include/llvm/Target/TargetMachine.h
2009-08-05 16:39:42 +00:00

450 lines
17 KiB
C++

//===-- llvm/Target/TargetMachine.h - Target Information --------*- 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 the TargetMachine and LLVMTargetMachine classes.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_TARGET_TARGETMACHINE_H
#define LLVM_TARGET_TARGETMACHINE_H
#include "llvm/Target/TargetInstrItineraries.h"
#include <cassert>
namespace llvm {
class Target;
class TargetAsmInfo;
class TargetData;
class TargetSubtarget;
class TargetInstrInfo;
class TargetIntrinsicInfo;
class TargetJITInfo;
class TargetLowering;
class TargetFrameInfo;
class MachineCodeEmitter;
class JITCodeEmitter;
class ObjectCodeEmitter;
class TargetRegisterInfo;
class PassManagerBase;
class PassManager;
class Pass;
class TargetMachOWriterInfo;
class TargetELFWriterInfo;
class formatted_raw_ostream;
// Relocation model types.
namespace Reloc {
enum Model {
Default,
Static,
PIC_, // Cannot be named PIC due to collision with -DPIC
DynamicNoPIC
};
}
// Code model types.
namespace CodeModel {
enum Model {
Default,
Small,
Kernel,
Medium,
Large
};
}
namespace FileModel {
enum Model {
Error,
None,
AsmFile,
MachOFile,
ElfFile
};
}
// Code generation optimization level.
namespace CodeGenOpt {
enum Level {
Default,
None,
Aggressive
};
}
//===----------------------------------------------------------------------===//
///
/// TargetMachine - Primary interface to the complete machine description for
/// the target machine. All target-specific information should be accessible
/// through this interface.
///
class TargetMachine {
TargetMachine(const TargetMachine &); // DO NOT IMPLEMENT
void operator=(const TargetMachine &); // DO NOT IMPLEMENT
protected: // Can only create subclasses.
TargetMachine(const Target &);
/// 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; }
/// TheTarget - The Target that this machine was created for.
const Target &TheTarget;
/// AsmInfo - Contains target specific asm information.
///
mutable const TargetAsmInfo *AsmInfo;
/// createTargetAsmInfo - Create a new instance of target specific asm
/// information.
virtual const TargetAsmInfo *createTargetAsmInfo() const { return 0; }
public:
virtual ~TargetMachine();
const Target &getTarget() const { return TheTarget; }
// 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; }
/// getTargetAsmInfo - Return target specific asm information.
///
const TargetAsmInfo *getTargetAsmInfo() const {
if (!AsmInfo) AsmInfo = createTargetAsmInfo();
return AsmInfo;
}
/// 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 TargetRegisterInfo *getRegisterInfo() const { return 0; }
/// getIntrinsicInfo - If intrinsic information is available, return it. If
/// not, return null.
///
virtual const TargetIntrinsicInfo *getIntrinsicInfo() 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();
}
/// getMachOWriterInfo - If this target supports a Mach-O writer, return
/// information for it, otherwise return null.
///
virtual const TargetMachOWriterInfo *getMachOWriterInfo() const { return 0; }
/// getELFWriterInfo - If this target supports an ELF writer, return
/// information for it, otherwise return null.
///
virtual const TargetELFWriterInfo *getELFWriterInfo() const { return 0; }
/// 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);
/// getCodeModel - Returns the code model. The choices are small, kernel,
/// medium, large, and target default.
static CodeModel::Model getCodeModel();
/// setCodeModel - Sets the code model.
///
static void setCodeModel(CodeModel::Model Model);
/// getAsmVerbosityDefault - Returns the default value of asm verbosity.
///
static bool getAsmVerbosityDefault();
/// setAsmVerbosityDefault - Set the default value of asm verbosity. Default
/// is false.
static void setAsmVerbosityDefault(bool);
/// CodeGenFileType - These enums are meant to be passed into
/// addPassesToEmitFile to indicate what type of file to emit.
enum CodeGenFileType {
AssemblyFile, ObjectFile, DynamicLibrary
};
/// getEnableTailMergeDefault - the default setting for -enable-tail-merge
/// on this target. User flag overrides.
virtual bool getEnableTailMergeDefault() const { return true; }
/// addPassesToEmitFile - Add passes to the specified pass manager to get the
/// specified file emitted. Typically this will involve several steps of code
/// generation.
/// This method should return FileModel::Error if emission of this file type
/// is not supported.
///
virtual FileModel::Model addPassesToEmitFile(PassManagerBase &,
formatted_raw_ostream &,
CodeGenFileType,
CodeGenOpt::Level) {
return FileModel::None;
}
/// addPassesToEmitFileFinish - If the passes to emit the specified file had
/// to be split up (e.g., to add an object writer pass), this method can be
/// used to finish up adding passes to emit the file, if necessary.
///
virtual bool addPassesToEmitFileFinish(PassManagerBase &,
MachineCodeEmitter *,
CodeGenOpt::Level) {
return true;
}
/// addPassesToEmitFileFinish - If the passes to emit the specified file had
/// to be split up (e.g., to add an object writer pass), this method can be
/// used to finish up adding passes to emit the file, if necessary.
///
virtual bool addPassesToEmitFileFinish(PassManagerBase &,
JITCodeEmitter *,
CodeGenOpt::Level) {
return true;
}
/// addPassesToEmitFileFinish - If the passes to emit the specified file had
/// to be split up (e.g., to add an object writer pass), this method can be
/// used to finish up adding passes to emit the file, if necessary.
///
virtual bool addPassesToEmitFileFinish(PassManagerBase &,
ObjectCodeEmitter *,
CodeGenOpt::Level) {
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 returns true if machine code emission is
/// not supported.
///
virtual bool addPassesToEmitMachineCode(PassManagerBase &,
MachineCodeEmitter &,
CodeGenOpt::Level) {
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 returns true if machine code emission is
/// not supported.
///
virtual bool addPassesToEmitMachineCode(PassManagerBase &,
JITCodeEmitter &,
CodeGenOpt::Level) {
return true;
}
/// addPassesToEmitWholeFile - This method can be implemented by targets that
/// require having the entire module at once. This is not recommended, do not
/// use this.
virtual bool WantsWholeFile() const { return false; }
virtual bool addPassesToEmitWholeFile(PassManager &, formatted_raw_ostream &,
CodeGenFileType,
CodeGenOpt::Level) {
return true;
}
};
/// LLVMTargetMachine - This class describes a target machine that is
/// implemented with the LLVM target-independent code generator.
///
class LLVMTargetMachine : public TargetMachine {
protected: // Can only create subclasses.
LLVMTargetMachine(const Target &T) : TargetMachine(T) { }
/// addCommonCodeGenPasses - Add standard LLVM codegen passes used for
/// both emitting to assembly files or machine code output.
///
bool addCommonCodeGenPasses(PassManagerBase &, CodeGenOpt::Level);
public:
/// addPassesToEmitFile - Add passes to the specified pass manager to get the
/// specified file emitted. Typically this will involve several steps of code
/// generation. If OptLevel is None, the code generator should emit code as fast
/// as possible, though the generated code may be less efficient. This method
/// should return FileModel::Error if emission of this file type is not
/// supported.
///
/// The default implementation of this method adds components from the
/// LLVM retargetable code generator, invoking the methods below to get
/// target-specific passes in standard locations.
///
virtual FileModel::Model addPassesToEmitFile(PassManagerBase &PM,
formatted_raw_ostream &Out,
CodeGenFileType FileType,
CodeGenOpt::Level);
/// addPassesToEmitFileFinish - If the passes to emit the specified file had
/// to be split up (e.g., to add an object writer pass), this method can be
/// used to finish up adding passes to emit the file, if necessary.
///
virtual bool addPassesToEmitFileFinish(PassManagerBase &PM,
MachineCodeEmitter *MCE,
CodeGenOpt::Level);
/// addPassesToEmitFileFinish - If the passes to emit the specified file had
/// to be split up (e.g., to add an object writer pass), this method can be
/// used to finish up adding passes to emit the file, if necessary.
///
virtual bool addPassesToEmitFileFinish(PassManagerBase &PM,
JITCodeEmitter *JCE,
CodeGenOpt::Level);
/// addPassesToEmitFileFinish - If the passes to emit the specified file had
/// to be split up (e.g., to add an object writer pass), this method can be
/// used to finish up adding passes to emit the file, if necessary.
///
virtual bool addPassesToEmitFileFinish(PassManagerBase &PM,
ObjectCodeEmitter *OCE,
CodeGenOpt::Level);
/// 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 returns true if machine code emission is
/// not supported.
///
virtual bool addPassesToEmitMachineCode(PassManagerBase &PM,
MachineCodeEmitter &MCE,
CodeGenOpt::Level);
/// 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 returns true if machine code emission is
/// not supported.
///
virtual bool addPassesToEmitMachineCode(PassManagerBase &PM,
JITCodeEmitter &MCE,
CodeGenOpt::Level);
/// Target-Independent Code Generator Pass Configuration Options.
/// addInstSelector - This method should add any "last minute" LLVM->LLVM
/// passes, then install an instruction selector pass, which converts from
/// LLVM code to machine instructions.
virtual bool addInstSelector(PassManagerBase &, CodeGenOpt::Level) {
return true;
}
/// addPreRegAllocPasses - This method may be implemented by targets that want
/// to run passes immediately before register allocation. This should return
/// true if -print-machineinstrs should print after these passes.
virtual bool addPreRegAlloc(PassManagerBase &, CodeGenOpt::Level) {
return false;
}
/// addPostRegAllocPasses - This method may be implemented by targets that
/// want to run passes after register allocation but before prolog-epilog
/// insertion. This should return true if -print-machineinstrs should print
/// after these passes.
virtual bool addPostRegAlloc(PassManagerBase &, CodeGenOpt::Level) {
return false;
}
/// addPreEmitPass - This pass may be implemented by targets that want to run
/// passes immediately before machine code is emitted. This should return
/// true if -print-machineinstrs should print out the code after the passes.
virtual bool addPreEmitPass(PassManagerBase &, CodeGenOpt::Level) {
return false;
}
/// addCodeEmitter - This pass should be overridden by the target to add a
/// code emitter, if supported. If this is not supported, 'true' should be
/// returned.
virtual bool addCodeEmitter(PassManagerBase &, CodeGenOpt::Level,
MachineCodeEmitter &) {
return true;
}
/// addCodeEmitter - This pass should be overridden by the target to add a
/// code emitter, if supported. If this is not supported, 'true' should be
/// returned.
virtual bool addCodeEmitter(PassManagerBase &, CodeGenOpt::Level,
JITCodeEmitter &) {
return true;
}
/// addSimpleCodeEmitter - This pass should be overridden by the target to add
/// a code emitter (without setting flags), if supported. If this is not
/// supported, 'true' should be returned.
virtual bool addSimpleCodeEmitter(PassManagerBase &, CodeGenOpt::Level,
MachineCodeEmitter &) {
return true;
}
/// addSimpleCodeEmitter - This pass should be overridden by the target to add
/// a code emitter (without setting flags), if supported. If this is not
/// supported, 'true' should be returned.
virtual bool addSimpleCodeEmitter(PassManagerBase &, CodeGenOpt::Level,
JITCodeEmitter &) {
return true;
}
/// addSimpleCodeEmitter - This pass should be overridden by the target to add
/// a code emitter (without setting flags), if supported. If this is not
/// supported, 'true' should be returned.
virtual bool addSimpleCodeEmitter(PassManagerBase &, CodeGenOpt::Level,
ObjectCodeEmitter &) {
return true;
}
/// getEnableTailMergeDefault - the default setting for -enable-tail-merge
/// on this target. User flag overrides.
virtual bool getEnableTailMergeDefault() const { return true; }
/// addAssemblyEmitter - Helper function which creates a target specific
/// assembly printer, if available.
///
/// \return Returns 'false' on success.
bool addAssemblyEmitter(PassManagerBase &, CodeGenOpt::Level,
bool /* VerboseAsmDefault */,
formatted_raw_ostream &);
};
} // End llvm namespace
#endif