//===-- 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 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.
+// This file defines the TargetMachine and LLVMTargetMachine classes.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_TARGET_TARGETMACHINE_H
#define LLVM_TARGET_TARGETMACHINE_H
-#include "llvm/Target/TargetData.h"
+#include "llvm/Target/TargetInstrItineraries.h"
#include <cassert>
+#include <string>
namespace llvm {
+class TargetAsmInfo;
+class TargetData;
+class TargetSubtarget;
class TargetInstrInfo;
-class TargetInstrDescriptor;
class TargetJITInfo;
-class TargetSchedInfo;
-class SparcV9RegInfo;
+class TargetLowering;
class TargetFrameInfo;
class MachineCodeEmitter;
class MRegisterInfo;
+class Module;
class FunctionPassManager;
class PassManager;
class Pass;
-class IntrinsicLowering;
+class TargetMachOWriterInfo;
+class TargetELFWriterInfo;
+
+// 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
+ };
+}
//===----------------------------------------------------------------------===//
///
/// 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;
- const TargetData DataLayout; // Calculates type size & alignment
- IntrinsicLowering *IL; // Specifies how to lower intrinsic calls
+ TargetMachine(const TargetMachine &); // DO NOT IMPLEMENT
+ void operator=(const TargetMachine &); // DO NOT IMPLEMENT
+protected: // Can only create subclasses.
+ TargetMachine() : AsmInfo(NULL) { }
+
+ /// 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; }
- TargetMachine(const TargetMachine&); // DO NOT IMPLEMENT
- void operator=(const TargetMachine&); // DO NOT IMPLEMENT
-protected: // Can only create subclasses...
- TargetMachine(const std::string &name, IntrinsicLowering *IL,
- bool LittleEndian = false,
- unsigned char PtrSize = 8, unsigned char PtrAl = 8,
- unsigned char DoubleAl = 8, unsigned char FloatAl = 4,
- unsigned char LongAl = 8, unsigned char IntAl = 4,
- unsigned char ShortAl = 2, unsigned char ByteAl = 1);
-
- /// 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.
+ /// AsmInfo - Contains target specific asm information.
///
- TargetMachine(const std::string &name, IntrinsicLowering *IL,
- const Module &M);
+ mutable const TargetAsmInfo *AsmInfo;
+
+ /// createTargetAsmInfo - Create a new instance of target specific asm
+ /// information.
+ virtual const TargetAsmInfo *createTargetAsmInfo() const { return NULL; }
+
public:
virtual ~TargetMachine();
- const std::string &getName() const { return Name; }
+ /// 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; }
- /// getIntrinsicLowering - This method returns a reference to an
- /// IntrinsicLowering instance which should be used by the code generator to
- /// lower unknown intrinsic functions to the equivalent LLVM expansion.
- ///
- IntrinsicLowering &getIntrinsicLowering() const { return *IL; }
-
// 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; }
- const TargetData &getTargetData() const { return DataLayout; }
+ 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 MRegisterInfo* getRegisterInfo() const { return 0; }
+ 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();
+ }
+
+ /// 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();
- // These are deprecated interfaces.
- virtual const TargetSchedInfo *getSchedInfo() const { return 0; }
- virtual const SparcV9RegInfo *getRegInfo() const { return 0; }
+ /// setCodeModel - Sets the code model.
+ static void setCodeModel(CodeModel::Model Model);
- /// addPassesToEmitAssembly - Add passes to the specified pass manager to get
- /// assembly langage code emitted. Typically this will involve several steps
- /// of code generation. This method should return true if assembly emission
+ /// 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. If Fast is set to true, 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.
///
- virtual bool addPassesToEmitAssembly(PassManager &PM, std::ostream &Out) {
+ virtual FileModel::Model addPassesToEmitFile(FunctionPassManager &PM,
+ std::ostream &Out,
+ CodeGenFileType FileType,
+ bool Fast) {
+ 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(FunctionPassManager &PM,
+ MachineCodeEmitter *MCE, 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 returns true if machine code emission is
+ /// not supported.
+ ///
+ virtual bool addPassesToEmitMachineCode(FunctionPassManager &PM,
+ MachineCodeEmitter &MCE, bool Fast) {
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 &PM, std::ostream &Out,
+ CodeGenFileType FileType, bool Fast) {
+ 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() { }
+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 Fast is set to true, 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(FunctionPassManager &PM,
+ std::ostream &Out,
+ CodeGenFileType FileType,
+ bool Fast);
+
+ /// 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(FunctionPassManager &PM,
+ MachineCodeEmitter *MCE, bool Fast);
+
/// 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
+ /// of functions. This method returns true if machine code emission is
/// not supported.
///
virtual bool addPassesToEmitMachineCode(FunctionPassManager &PM,
- MachineCodeEmitter &MCE) {
+ MachineCodeEmitter &MCE, bool Fast);
+
+ /// 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(FunctionPassManager &PM, bool Fast) {
return true;
}
+
+ /// 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(FunctionPassManager &PM, bool Fast) {
+ 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(FunctionPassManager &PM, bool Fast) {
+ return false;
+ }
+
+
+ /// addAssemblyEmitter - This pass should be overridden by the target to add
+ /// the asmprinter, if asm emission is supported. If this is not supported,
+ /// 'true' should be returned.
+ virtual bool addAssemblyEmitter(FunctionPassManager &PM, bool Fast,
+ std::ostream &Out) {
+ 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. If DumpAsm is true, the generated assembly is printed to cerr.
+ virtual bool addCodeEmitter(FunctionPassManager &PM, bool Fast, bool DumpAsm,
+ MachineCodeEmitter &MCE) {
+ 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. If DumpAsm is true, the generated
+ /// assembly is printed to cerr.
+ virtual bool addSimpleCodeEmitter(FunctionPassManager &PM, bool Fast,
+ bool DumpAsm, MachineCodeEmitter &MCE) {
+ return true;
+ }
+
+ /// getEnableTailMergeDefault - the default setting for -enable-tail-merge
+ /// on this target. User flag overrides.
+ virtual bool getEnableTailMergeDefault() const { return true; }
};
} // End llvm namespace
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