1 //===-- llvm/Target/TargetMachine.h - Target Information --------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file describes the general parts of a Target machine.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_TARGET_TARGETMACHINE_H
15 #define LLVM_TARGET_TARGETMACHINE_H
17 #include "llvm/Target/TargetData.h"
22 class TargetInstrInfo;
23 class TargetInstrDescriptor;
25 class TargetSchedInfo;
27 class TargetFrameInfo;
28 class MachineCodeEmitter;
30 class FunctionPassManager;
33 class IntrinsicLowering;
35 //===----------------------------------------------------------------------===//
37 /// TargetMachine - Primary interface to the complete machine description for
38 /// the target machine. All target-specific information should be accessible
39 /// through this interface.
42 const std::string Name;
43 const TargetData DataLayout; // Calculates type size & alignment
44 IntrinsicLowering *IL; // Specifies how to lower intrinsic calls
46 TargetMachine(const TargetMachine&); // DO NOT IMPLEMENT
47 void operator=(const TargetMachine&); // DO NOT IMPLEMENT
48 protected: // Can only create subclasses...
49 TargetMachine(const std::string &name, IntrinsicLowering *IL,
50 bool LittleEndian = false,
51 unsigned char PtrSize = 8, unsigned char PtrAl = 8,
52 unsigned char DoubleAl = 8, unsigned char FloatAl = 4,
53 unsigned char LongAl = 8, unsigned char IntAl = 4,
54 unsigned char ShortAl = 2, unsigned char ByteAl = 1);
56 /// This constructor is used for targets that support arbitrary TargetData
57 /// layouts, like the C backend. It initializes the TargetData to match that
58 /// of the specified module.
60 TargetMachine(const std::string &name, IntrinsicLowering *IL,
63 virtual ~TargetMachine();
65 /// getModuleMatchQuality - This static method should be implemented by
66 /// targets to indicate how closely they match the specified module. This is
67 /// used by the LLC tool to determine which target to use when an explicit
68 /// -march option is not specified. If a target returns zero, it will never
69 /// be chosen without an explicit -march option.
70 static unsigned getModuleMatchQuality(const Module &M) { return 0; }
72 /// getJITMatchQuality - This static method should be implemented by targets
73 /// that provide JIT capabilities to indicate how suitable they are for
74 /// execution on the current host. If a value of 0 is returned, the target
75 /// will not be used unless an explicit -march option is used.
76 static unsigned getJITMatchQuality() { return 0; }
79 const std::string &getName() const { return Name; }
81 /// getIntrinsicLowering - This method returns a reference to an
82 /// IntrinsicLowering instance which should be used by the code generator to
83 /// lower unknown intrinsic functions to the equivalent LLVM expansion.
85 IntrinsicLowering &getIntrinsicLowering() const { return *IL; }
87 // Interfaces to the major aspects of target machine information:
88 // -- Instruction opcode and operand information
89 // -- Pipelines and scheduling information
90 // -- Stack frame information
92 virtual const TargetInstrInfo *getInstrInfo() const { return 0; }
93 virtual const TargetFrameInfo *getFrameInfo() const { return 0; }
94 const TargetData &getTargetData() const { return DataLayout; }
96 /// getRegisterInfo - If register information is available, return it. If
97 /// not, return null. This is kept separate from RegInfo until RegInfo has
98 /// details of graph coloring register allocation removed from it.
100 virtual const MRegisterInfo* getRegisterInfo() const { return 0; }
102 /// getJITInfo - If this target supports a JIT, return information for it,
103 /// otherwise return null.
105 virtual TargetJITInfo *getJITInfo() { return 0; }
107 // These are deprecated interfaces.
108 virtual const TargetSchedInfo *getSchedInfo() const { return 0; }
109 virtual const SparcV9RegInfo *getRegInfo() const { return 0; }
111 /// addPassesToEmitAssembly - Add passes to the specified pass manager to get
112 /// assembly langage code emitted. Typically this will involve several steps
113 /// of code generation. This method should return true if assembly emission
114 /// is not supported.
116 virtual bool addPassesToEmitAssembly(PassManager &PM, std::ostream &Out) {
120 /// addPassesToEmitMachineCode - Add passes to the specified pass manager to
121 /// get machine code emitted. This uses a MachineCodeEmitter object to handle
122 /// actually outputting the machine code and resolving things like the address
123 /// of functions. This method should returns true if machine code emission is
126 virtual bool addPassesToEmitMachineCode(FunctionPassManager &PM,
127 MachineCodeEmitter &MCE) {
132 } // End llvm namespace