LLVM API Documentation
00001 //===-- llvm/Target/TargetMachine.h - Target Information --------*- C++ -*-===// 00002 // 00003 // The LLVM Compiler Infrastructure 00004 // 00005 // This file was developed by the LLVM research group and is distributed under 00006 // the University of Illinois Open Source License. See LICENSE.TXT for details. 00007 // 00008 //===----------------------------------------------------------------------===// 00009 // 00010 // This file describes the general parts of a Target machine. 00011 // 00012 //===----------------------------------------------------------------------===// 00013 00014 #ifndef LLVM_TARGET_TARGETMACHINE_H 00015 #define LLVM_TARGET_TARGETMACHINE_H 00016 00017 #include "llvm/Target/TargetData.h" 00018 #include <cassert> 00019 00020 namespace llvm { 00021 00022 class TargetInstrInfo; 00023 class TargetInstrDescriptor; 00024 class TargetJITInfo; 00025 class TargetSchedInfo; 00026 class SparcV9RegInfo; 00027 class TargetFrameInfo; 00028 class MachineCodeEmitter; 00029 class MRegisterInfo; 00030 class FunctionPassManager; 00031 class PassManager; 00032 class Pass; 00033 class IntrinsicLowering; 00034 00035 //===----------------------------------------------------------------------===// 00036 /// 00037 /// TargetMachine - Primary interface to the complete machine description for 00038 /// the target machine. All target-specific information should be accessible 00039 /// through this interface. 00040 /// 00041 class TargetMachine { 00042 const std::string Name; 00043 const TargetData DataLayout; // Calculates type size & alignment 00044 IntrinsicLowering *IL; // Specifies how to lower intrinsic calls 00045 00046 TargetMachine(const TargetMachine&); // DO NOT IMPLEMENT 00047 void operator=(const TargetMachine&); // DO NOT IMPLEMENT 00048 protected: // Can only create subclasses... 00049 TargetMachine(const std::string &name, IntrinsicLowering *IL, 00050 bool LittleEndian = false, 00051 unsigned char PtrSize = 8, unsigned char PtrAl = 8, 00052 unsigned char DoubleAl = 8, unsigned char FloatAl = 4, 00053 unsigned char LongAl = 8, unsigned char IntAl = 4, 00054 unsigned char ShortAl = 2, unsigned char ByteAl = 1, 00055 unsigned char BoolAl = 1); 00056 00057 TargetMachine(const std::string &name, IntrinsicLowering *IL, 00058 const TargetData &TD); 00059 00060 /// This constructor is used for targets that support arbitrary TargetData 00061 /// layouts, like the C backend. It initializes the TargetData to match that 00062 /// of the specified module. 00063 /// 00064 TargetMachine(const std::string &name, IntrinsicLowering *IL, 00065 const Module &M); 00066 public: 00067 virtual ~TargetMachine(); 00068 00069 /// getModuleMatchQuality - This static method should be implemented by 00070 /// targets to indicate how closely they match the specified module. This is 00071 /// used by the LLC tool to determine which target to use when an explicit 00072 /// -march option is not specified. If a target returns zero, it will never 00073 /// be chosen without an explicit -march option. 00074 static unsigned getModuleMatchQuality(const Module &M) { return 0; } 00075 00076 /// getJITMatchQuality - This static method should be implemented by targets 00077 /// that provide JIT capabilities to indicate how suitable they are for 00078 /// execution on the current host. If a value of 0 is returned, the target 00079 /// will not be used unless an explicit -march option is used. 00080 static unsigned getJITMatchQuality() { return 0; } 00081 00082 00083 const std::string &getName() const { return Name; } 00084 00085 /// getIntrinsicLowering - This method returns a reference to an 00086 /// IntrinsicLowering instance which should be used by the code generator to 00087 /// lower unknown intrinsic functions to the equivalent LLVM expansion. 00088 /// 00089 IntrinsicLowering &getIntrinsicLowering() const { return *IL; } 00090 00091 // Interfaces to the major aspects of target machine information: 00092 // -- Instruction opcode and operand information 00093 // -- Pipelines and scheduling information 00094 // -- Stack frame information 00095 // 00096 virtual const TargetInstrInfo *getInstrInfo() const { return 0; } 00097 virtual const TargetFrameInfo *getFrameInfo() const { return 0; } 00098 const TargetData &getTargetData() const { return DataLayout; } 00099 00100 /// getRegisterInfo - If register information is available, return it. If 00101 /// not, return null. This is kept separate from RegInfo until RegInfo has 00102 /// details of graph coloring register allocation removed from it. 00103 /// 00104 virtual const MRegisterInfo* getRegisterInfo() const { return 0; } 00105 00106 /// getJITInfo - If this target supports a JIT, return information for it, 00107 /// otherwise return null. 00108 /// 00109 virtual TargetJITInfo *getJITInfo() { return 0; } 00110 00111 // These are deprecated interfaces. 00112 virtual const TargetSchedInfo *getSchedInfo() const { return 0; } 00113 virtual const SparcV9RegInfo *getRegInfo() const { return 0; } 00114 00115 /// addPassesToEmitAssembly - Add passes to the specified pass manager to get 00116 /// assembly langage code emitted. Typically this will involve several steps 00117 /// of code generation. This method should return true if assembly emission 00118 /// is not supported. 00119 /// 00120 virtual bool addPassesToEmitAssembly(PassManager &PM, std::ostream &Out) { 00121 return true; 00122 } 00123 00124 /// addPassesToEmitMachineCode - Add passes to the specified pass manager to 00125 /// get machine code emitted. This uses a MachineCodeEmitter object to handle 00126 /// actually outputting the machine code and resolving things like the address 00127 /// of functions. This method should returns true if machine code emission is 00128 /// not supported. 00129 /// 00130 virtual bool addPassesToEmitMachineCode(FunctionPassManager &PM, 00131 MachineCodeEmitter &MCE) { 00132 return true; 00133 } 00134 }; 00135 00136 } // End llvm namespace 00137 00138 #endif