lib/MC/MCDisassembler/EDDisassembler.h

   1 //===-- EDDisassembler.h - LLVM Enhanced Disassembler -----------*- C++ -*-===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file defines the interface for the Enhanced Disassembly library's
  11 // disassembler class.  The disassembler is responsible for vending individual
  12 // instructions according to a given architecture and disassembly syntax.
  13 //
  14 //===----------------------------------------------------------------------===//
  15
  16 #ifndef LLVM_EDDISASSEMBLER_H
  17 #define LLVM_EDDISASSEMBLER_H
  18
  19 #include "EDInfo.h"
  20
  21 #include "llvm/ADT/OwningPtr.h"
  22 #include "llvm/ADT/Triple.h"
  23 #include "llvm/Support/raw_ostream.h"
  24 #include "llvm/System/Mutex.h"
  25
  26 #include <map>
  27 #include <set>
  28 #include <vector>
  29
  30 namespace llvm {
  31 class AsmLexer;
  32 class AsmToken;
  33 class MCContext;
  34 class MCAsmInfo;
  35 class MCAsmLexer;
  36 class AsmParser;
  37 class TargetAsmLexer;
  38 class TargetAsmParser;
  39 class MCDisassembler;
  40 class MCInstPrinter;
  41 class MCInst;
  42 class MCParsedAsmOperand;
  43 class MCStreamer;
  44 template <typename T> class SmallVectorImpl;
  45 class SourceMgr;
  46 class Target;
  47 class TargetMachine;
  48 class TargetRegisterInfo;
  49
  50 struct EDInstInfo;
  51 struct EDInst;
  52 struct EDOperand;
  53 struct EDToken;
  54
  55 typedef int (*EDByteReaderCallback)(uint8_t *byte, uint64_t address, void *arg);
  56
  57 /// EDDisassembler - Encapsulates a disassembler for a single architecture and
  58 ///   disassembly syntax.  Also manages the static disassembler registry.
  59 struct EDDisassembler {
  60   typedef enum {
  61     /*! @constant kEDAssemblySyntaxX86Intel Intel syntax for i386 and x86_64. */
  62     kEDAssemblySyntaxX86Intel  = 0,
  63     /*! @constant kEDAssemblySyntaxX86ATT AT&T syntax for i386 and x86_64. */
  64     kEDAssemblySyntaxX86ATT    = 1,
  65     kEDAssemblySyntaxARMUAL    = 2
  66   } AssemblySyntax;
  67
  68
  69   ////////////////////
  70   // Static members //
  71   ////////////////////
  72
  73   /// CPUKey - Encapsulates the descriptor of an architecture/disassembly-syntax
  74   ///   pair
  75   struct CPUKey {
  76     /// The architecture type
  77     llvm::Triple::ArchType Arch;
  78
  79     /// The assembly syntax
  80     AssemblySyntax Syntax;
  81
  82     /// operator== - Equality operator
  83     bool operator==(const CPUKey &key) const {
  84       return (Arch == key.Arch &&
  85               Syntax == key.Syntax);
  86     }
  87
  88     /// operator< - Less-than operator
  89     bool operator<(const CPUKey &key) const {
  90       if(Arch > key.Arch)
  91         return false;
  92       if(Syntax >= key.Syntax)
  93         return false;
  94       return true;
  95     }
  96   };
  97
  98   typedef std::map<CPUKey, EDDisassembler*> DisassemblerMap_t;
  99
 100   /// True if the disassembler registry has been initialized; false if not
 101   static bool sInitialized;
 102   /// A map from disassembler specifications to disassemblers.  Populated
 103   ///   lazily.
 104   static DisassemblerMap_t sDisassemblers;
 105
 106   /// getDisassembler - Returns the specified disassemble, or NULL on failure
 107   ///
 108   /// @arg arch   - The desired architecture
 109   /// @arg syntax - The desired disassembly syntax
 110   static EDDisassembler *getDisassembler(llvm::Triple::ArchType arch,
 111                                          AssemblySyntax syntax);
 112
 113   /// getDisassembler - Returns the disassembler for a given combination of
 114   ///   CPU type, CPU subtype, and assembly syntax, or NULL on failure
 115   ///
 116   /// @arg str    - The string representation of the architecture triple, e.g.,
 117   ///               "x86_64-apple-darwin"
 118   /// @arg syntax - The disassembly syntax for the required disassembler
 119   static EDDisassembler *getDisassembler(llvm::StringRef str,
 120                                          AssemblySyntax syntax);
 121
 122   /// initialize - Initializes the disassembler registry and the LLVM backend
 123   static void initialize();
 124
 125   ////////////////////////
 126   // Per-object members //
 127   ////////////////////////
 128
 129   /// True only if the object has been successfully initialized
 130   bool Valid;
 131   /// True if the disassembler can provide semantic information
 132   bool HasSemantics;
 133
 134   /// The stream to write errors to
 135   llvm::raw_ostream &ErrorStream;
 136
 137   /// The architecture/syntax pair for the current architecture
 138   CPUKey Key;
 139   /// The LLVM target corresponding to the disassembler
 140   const llvm::Target *Tgt;
 141   /// The target machine instance.
 142   llvm::OwningPtr<llvm::TargetMachine> TargetMachine;
 143   /// The assembly information for the target architecture
 144   llvm::OwningPtr<const llvm::MCAsmInfo> AsmInfo;
 145   /// The disassembler for the target architecture
 146   llvm::OwningPtr<const llvm::MCDisassembler> Disassembler;
 147   /// The output string for the instruction printer; must be guarded with
 148   ///   PrinterMutex
 149   llvm::OwningPtr<std::string> InstString;
 150   /// The output stream for the disassembler; must be guarded with
 151   ///   PrinterMutex
 152   llvm::OwningPtr<llvm::raw_string_ostream> InstStream;
 153   /// The instruction printer for the target architecture; must be guarded with
 154   ///   PrinterMutex when printing
 155   llvm::OwningPtr<llvm::MCInstPrinter> InstPrinter;
 156   /// The mutex that guards the instruction printer's printing functions, which
 157   ///   use a shared stream
 158   llvm::sys::Mutex PrinterMutex;
 159   /// The array of instruction information provided by the TableGen backend for
 160   ///   the target architecture
 161   const llvm::EDInstInfo *InstInfos;
 162   /// The target-specific lexer for use in tokenizing strings, in
 163   ///   target-independent and target-specific portions
 164   llvm::OwningPtr<llvm::AsmLexer> GenericAsmLexer;
 165   llvm::OwningPtr<llvm::TargetAsmLexer> SpecificAsmLexer;
 166   /// The guard for the above
 167   llvm::sys::Mutex ParserMutex;
 168   /// The LLVM number used for the target disassembly syntax variant
 169   int LLVMSyntaxVariant;
 170
 171   typedef std::vector<std::string> regvec_t;
 172   typedef std::map<std::string, unsigned> regrmap_t;
 173
 174   /// A vector of registers for quick mapping from LLVM register IDs to names
 175   regvec_t RegVec;
 176   /// A map of registers for quick mapping from register names to LLVM IDs
 177   regrmap_t RegRMap;
 178
 179   /// A set of register IDs for aliases of the stack pointer for the current
 180   ///   architecture
 181   std::set<unsigned> stackPointers;
 182   /// A set of register IDs for aliases of the program counter for the current
 183   ///   architecture
 184   std::set<unsigned> programCounters;
 185
 186   /// Constructor - initializes a disassembler with all the necessary objects,
 187   ///   which come pre-allocated from the registry accessor function
 188   ///
 189   /// @arg key                - the architecture and disassembly syntax for the
 190   ///                           disassembler
 191   EDDisassembler(CPUKey& key);
 192
 193   /// valid - reports whether there was a failure in the constructor.
 194   bool valid() {
 195     return Valid;
 196   }
 197
 198   /// hasSemantics - reports whether the disassembler can provide operands and
 199   ///   tokens.
 200   bool hasSemantics() {
 201     return HasSemantics;
 202   }
 203
 204   ~EDDisassembler();
 205
 206   /// createInst - creates and returns an instruction given a callback and
 207   ///   memory address, or NULL on failure
 208   ///
 209   /// @arg byteReader - A callback function that provides machine code bytes
 210   /// @arg address    - The address of the first byte of the instruction,
 211   ///                   suitable for passing to byteReader
 212   /// @arg arg        - An opaque argument for byteReader
 213   EDInst *createInst(EDByteReaderCallback byteReader,
 214                      uint64_t address,
 215                      void *arg);
 216
 217   /// initMaps - initializes regVec and regRMap using the provided register
 218   ///   info
 219   ///
 220   /// @arg registerInfo - the register information to use as a source
 221   void initMaps(const llvm::TargetRegisterInfo &registerInfo);
 222   /// nameWithRegisterID - Returns the name (owned by the EDDisassembler) of a
 223   ///   register for a given register ID, or NULL on failure
 224   ///
 225   /// @arg registerID - the ID of the register to be queried
 226   const char *nameWithRegisterID(unsigned registerID) const;
 227   /// registerIDWithName - Returns the ID of a register for a given register
 228   ///   name, or (unsigned)-1 on failure
 229   ///
 230   /// @arg name - The name of the register
 231   unsigned registerIDWithName(const char *name) const;
 232
 233   /// registerIsStackPointer - reports whether a register ID is an alias for the
 234   ///   stack pointer register
 235   ///
 236   /// @arg registerID - The LLVM register ID
 237   bool registerIsStackPointer(unsigned registerID);
 238   /// registerIsStackPointer - reports whether a register ID is an alias for the
 239   ///   stack pointer register
 240   ///
 241   /// @arg registerID - The LLVM register ID
 242   bool registerIsProgramCounter(unsigned registerID);
 243
 244   /// printInst - prints an MCInst to a string, returning 0 on success, or -1
 245   ///   otherwise
 246   ///
 247   /// @arg str  - A reference to a string which is filled in with the string
 248   ///             representation of the instruction
 249   /// @arg inst - A reference to the MCInst to be printed
 250   int printInst(std::string& str,
 251                 llvm::MCInst& inst);
 252
 253   /// parseInst - extracts operands and tokens from a string for use in
 254   ///   tokenizing the string.  Returns 0 on success, or -1 otherwise.
 255   ///
 256   /// @arg operands - A reference to a vector that will be filled in with the
 257   ///                 parsed operands
 258   /// @arg tokens   - A reference to a vector that will be filled in with the
 259   ///                 tokens
 260   /// @arg str      - The string representation of the instruction
 261   int parseInst(llvm::SmallVectorImpl<llvm::MCParsedAsmOperand*> &operands,
 262                 llvm::SmallVectorImpl<llvm::AsmToken> &tokens,
 263                 const std::string &str);
 264
 265   /// llvmSyntaxVariant - returns the LLVM syntax variant for this disassembler
 266   int llvmSyntaxVariant() const;
 267 };
 268
 269 } // end namespace llvm
 270
 271 #endif