TargetMachine.h revision ccca2ed8543d2ec08782eb2237242d59b7b8f7b3 
1//===-- llvm/Target/Machine.h - General Target Information -------*- C++ -*-==//
2//
3// This file describes the general parts of a Target machine.
4//
5//===----------------------------------------------------------------------===//
6
7#ifndef LLVM_TARGET_TARGETMACHINE_H
8#define LLVM_TARGET_TARGETMACHINE_H
9
10#include "llvm/Target/TargetData.h"
11#include "llvm/Pass.h"
12#include "Support/NonCopyable.h"
13
14class MachineInstrInfo;
15class MachineInstrDescriptor;
16class MachineSchedInfo;
17class MachineRegInfo;
18class MachineFrameInfo;
19class MachineCacheInfo;
20
21//---------------------------------------------------------------------------
22// class TargetMachine
23//
24// Purpose:
25//   Primary interface to the complete machine description for the
26//   target machine.  All target-specific information should be
27//   accessible through this interface.
28//
29//---------------------------------------------------------------------------
30
31class TargetMachine : public NonCopyableV {
32public:
33  const std::string TargetName;
34  const TargetData DataLayout;		// Calculates type size & alignment
35  int              optSizeForSubWordData;
36  int	           minMemOpWordSize;
37  int	           maxAtomicMemOpWordSize;
38
39protected:
40  TargetMachine(const std::string &targetname, // Can only create subclasses...
41		unsigned char PtrSize = 8, unsigned char PtrAl = 8,
42		unsigned char DoubleAl = 8, unsigned char FloatAl = 4,
43		unsigned char LongAl = 8, unsigned char IntAl = 4,
44		unsigned char ShortAl = 2, unsigned char ByteAl = 1)
45    : TargetName(targetname), DataLayout(targetname, PtrSize, PtrAl,
46					 DoubleAl, FloatAl, LongAl, IntAl,
47					 ShortAl, ByteAl) { }
48public:
49  virtual ~TargetMachine() {}
50
51  //
52  // Interfaces to the major aspects of target machine information:
53  // -- Instruction opcode and operand information
54  // -- Pipelines and scheduling information
55  // -- Register information
56  //
57  virtual const MachineInstrInfo&       getInstrInfo() const = 0;
58  virtual const MachineSchedInfo&       getSchedInfo() const = 0;
59  virtual const MachineRegInfo&	        getRegInfo()   const = 0;
60  virtual const MachineFrameInfo&       getFrameInfo() const = 0;
61  virtual const MachineCacheInfo&       getCacheInfo() const = 0;
62
63  //
64  // Data storage information
65  //
66  virtual unsigned int	findOptimalStorageSize	(const Type* ty) const;
67
68  //
69  // addPassesToEmitAssembly - Add passes to the specified pass manager to get
70  // assembly langage code emited.  Typically this will involve several steps of
71  // code generation.
72  //
73  virtual void addPassesToEmitAssembly(PassManager &PM, std::ostream &Out) = 0;
74};
75
76#endif
77