AsmPrinter.h revision 4c269e2feb230d4380c0b3cd72da517bd2222023
1//===-- llvm/CodeGen/AsmPrinter.h - AsmPrinter Framework --------*- 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 contains a class to be used as the base class for target specific 11// asm writers. This class primarily handles common functionality used by 12// all asm writers. 13// 14//===----------------------------------------------------------------------===// 15 16#ifndef LLVM_CODEGEN_ASMPRINTER_H 17#define LLVM_CODEGEN_ASMPRINTER_H 18 19#include "llvm/CodeGen/MachineFunctionPass.h" 20#include "llvm/Support/DebugLoc.h" 21#include "llvm/Target/TargetMachine.h" 22#include "llvm/ADT/DenseMap.h" 23 24namespace llvm { 25 class BlockAddress; 26 class GCStrategy; 27 class Constant; 28 class ConstantArray; 29 class ConstantFP; 30 class ConstantInt; 31 class ConstantStruct; 32 class ConstantVector; 33 class GCMetadataPrinter; 34 class GlobalValue; 35 class GlobalVariable; 36 class MachineBasicBlock; 37 class MachineFunction; 38 class MachineInstr; 39 class MachineLoopInfo; 40 class MachineLoop; 41 class MachineConstantPool; 42 class MachineConstantPoolEntry; 43 class MachineConstantPoolValue; 44 class MachineJumpTableInfo; 45 class MachineModuleInfo; 46 class MCInst; 47 class MCContext; 48 class MCSection; 49 class MCStreamer; 50 class MCSymbol; 51 class DwarfWriter; 52 class Mangler; 53 class MCAsmInfo; 54 class TargetLoweringObjectFile; 55 class Type; 56 class formatted_raw_ostream; 57 58 /// AsmPrinter - This class is intended to be used as a driving class for all 59 /// asm writers. 60 class AsmPrinter : public MachineFunctionPass { 61 static char ID; 62 63 /// FunctionNumber - This provides a unique ID for each function emitted in 64 /// this translation unit. It is autoincremented by SetupMachineFunction, 65 /// and can be accessed with getFunctionNumber() and 66 /// IncrementFunctionNumber(). 67 /// 68 unsigned FunctionNumber; 69 70 // GCMetadataPrinters - The garbage collection metadata printer table. 71 typedef DenseMap<GCStrategy*,GCMetadataPrinter*> gcp_map_type; 72 typedef gcp_map_type::iterator gcp_iterator; 73 gcp_map_type GCMetadataPrinters; 74 75 /// If VerboseAsm is set, a pointer to the loop info for this 76 /// function. 77 /// 78 MachineLoopInfo *LI; 79 80 public: 81 /// MMI - If available, this is a pointer to the current MachineModuleInfo. 82 MachineModuleInfo *MMI; 83 84 protected: 85 /// DW - If available, this is a pointer to the current dwarf writer. 86 DwarfWriter *DW; 87 88 public: 89 /// Flags to specify different kinds of comments to output in 90 /// assembly code. These flags carry semantic information not 91 /// otherwise easily derivable from the IR text. 92 /// 93 enum CommentFlag { 94 ReloadReuse = 0x1 95 }; 96 97 /// Output stream on which we're printing assembly code. 98 /// 99 formatted_raw_ostream &O; 100 101 /// Target machine description. 102 /// 103 TargetMachine &TM; 104 105 /// getObjFileLowering - Return information about object file lowering. 106 TargetLoweringObjectFile &getObjFileLowering() const; 107 108 /// Target Asm Printer information. 109 /// 110 const MCAsmInfo *MAI; 111 112 /// Target Register Information. 113 /// 114 const TargetRegisterInfo *TRI; 115 116 /// OutContext - This is the context for the output file that we are 117 /// streaming. This owns all of the global MC-related objects for the 118 /// generated translation unit. 119 MCContext &OutContext; 120 121 /// OutStreamer - This is the MCStreamer object for the file we are 122 /// generating. This contains the transient state for the current 123 /// translation unit that we are generating (such as the current section 124 /// etc). 125 MCStreamer &OutStreamer; 126 127 /// The current machine function. 128 const MachineFunction *MF; 129 130 /// Name-mangler for global names. 131 /// 132 Mangler *Mang; 133 134 /// Cache of mangled name for current function. This is recalculated at the 135 /// beginning of each call to runOnMachineFunction(). 136 /// 137 std::string CurrentFnName; 138 139 /// getCurrentSection() - Return the current section we are emitting to. 140 const MCSection *getCurrentSection() const; 141 142 143 /// VerboseAsm - Emit comments in assembly output if this is true. 144 /// 145 bool VerboseAsm; 146 147 /// Private state for PrintSpecial() 148 // Assign a unique ID to this machine instruction. 149 mutable const MachineInstr *LastMI; 150 mutable const Function *LastFn; 151 mutable unsigned Counter; 152 153 // Private state for processDebugLoc() 154 mutable DebugLocTuple PrevDLT; 155 156 protected: 157 explicit AsmPrinter(formatted_raw_ostream &o, TargetMachine &TM, 158 const MCAsmInfo *T, bool V); 159 160 public: 161 virtual ~AsmPrinter(); 162 163 /// isVerbose - Return true if assembly output should contain comments. 164 /// 165 bool isVerbose() const { return VerboseAsm; } 166 167 /// getFunctionNumber - Return a unique ID for the current function. 168 /// 169 unsigned getFunctionNumber() const { return FunctionNumber; } 170 171 protected: 172 /// getAnalysisUsage - Record analysis usage. 173 /// 174 void getAnalysisUsage(AnalysisUsage &AU) const; 175 176 /// doInitialization - Set up the AsmPrinter when we are working on a new 177 /// module. If your pass overrides this, it must make sure to explicitly 178 /// call this implementation. 179 bool doInitialization(Module &M); 180 181 /// EmitStartOfAsmFile - This virtual method can be overridden by targets 182 /// that want to emit something at the start of their file. 183 virtual void EmitStartOfAsmFile(Module &) {} 184 185 /// EmitEndOfAsmFile - This virtual method can be overridden by targets that 186 /// want to emit something at the end of their file. 187 virtual void EmitEndOfAsmFile(Module &) {} 188 189 /// doFinalization - Shut down the asmprinter. If you override this in your 190 /// pass, you must make sure to call it explicitly. 191 bool doFinalization(Module &M); 192 193 /// PrintSpecial - Print information related to the specified machine instr 194 /// that is independent of the operand, and may be independent of the instr 195 /// itself. This can be useful for portably encoding the comment character 196 /// or other bits of target-specific knowledge into the asmstrings. The 197 /// syntax used is ${:comment}. Targets can override this to add support 198 /// for their own strange codes. 199 virtual void PrintSpecial(const MachineInstr *MI, const char *Code) const; 200 201 /// PrintAsmOperand - Print the specified operand of MI, an INLINEASM 202 /// instruction, using the specified assembler variant. Targets should 203 /// override this to format as appropriate. This method can return true if 204 /// the operand is erroneous. 205 virtual bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo, 206 unsigned AsmVariant, const char *ExtraCode); 207 208 /// PrintAsmMemoryOperand - Print the specified operand of MI, an INLINEASM 209 /// instruction, using the specified assembler variant as an address. 210 /// Targets should override this to format as appropriate. This method can 211 /// return true if the operand is erroneous. 212 virtual bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo, 213 unsigned AsmVariant, 214 const char *ExtraCode); 215 216 /// PrintGlobalVariable - Emit the specified global variable and its 217 /// initializer to the output stream. 218 virtual void PrintGlobalVariable(const GlobalVariable *GV) = 0; 219 220 /// SetupMachineFunction - This should be called when a new MachineFunction 221 /// is being processed from runOnMachineFunction. 222 void SetupMachineFunction(MachineFunction &MF); 223 224 /// IncrementFunctionNumber - Increase Function Number. AsmPrinters should 225 /// not normally call this, as the counter is automatically bumped by 226 /// SetupMachineFunction. 227 void IncrementFunctionNumber() { FunctionNumber++; } 228 229 /// EmitConstantPool - Print to the current output stream assembly 230 /// representations of the constants in the constant pool MCP. This is 231 /// used to print out constants which have been "spilled to memory" by 232 /// the code generator. 233 /// 234 void EmitConstantPool(MachineConstantPool *MCP); 235 236 /// EmitJumpTableInfo - Print assembly representations of the jump tables 237 /// used by the current function to the current output stream. 238 /// 239 void EmitJumpTableInfo(MachineJumpTableInfo *MJTI, MachineFunction &MF); 240 241 /// EmitSpecialLLVMGlobal - Check to see if the specified global is a 242 /// special global used by LLVM. If so, emit it and return true, otherwise 243 /// do nothing and return false. 244 bool EmitSpecialLLVMGlobal(const GlobalVariable *GV); 245 246 public: 247 //===------------------------------------------------------------------===// 248 /// LEB 128 number encoding. 249 250 /// PrintULEB128 - Print a series of hexidecimal values(separated by commas) 251 /// representing an unsigned leb128 value. 252 void PrintULEB128(unsigned Value) const; 253 254 /// PrintSLEB128 - Print a series of hexidecimal values(separated by commas) 255 /// representing a signed leb128 value. 256 void PrintSLEB128(int Value) const; 257 258 //===------------------------------------------------------------------===// 259 // Emission and print routines 260 // 261 262 /// PrintHex - Print a value as a hexidecimal value. 263 /// 264 void PrintHex(int Value) const; 265 266 /// EOL - Print a newline character to asm stream. If a comment is present 267 /// then it will be printed first. Comments should not contain '\n'. 268 void EOL() const; 269 void EOL(const std::string &Comment) const; 270 void EOL(const char* Comment) const; 271 void EOL(const char *Comment, unsigned Encoding) const; 272 273 /// EmitULEB128Bytes - Emit an assembler byte data directive to compose an 274 /// unsigned leb128 value. 275 void EmitULEB128Bytes(unsigned Value) const; 276 277 /// EmitSLEB128Bytes - print an assembler byte data directive to compose a 278 /// signed leb128 value. 279 void EmitSLEB128Bytes(int Value) const; 280 281 /// EmitInt8 - Emit a byte directive and value. 282 /// 283 void EmitInt8(int Value) const; 284 285 /// EmitInt16 - Emit a short directive and value. 286 /// 287 void EmitInt16(int Value) const; 288 289 /// EmitInt32 - Emit a long directive and value. 290 /// 291 void EmitInt32(int Value) const; 292 293 /// EmitInt64 - Emit a long long directive and value. 294 /// 295 void EmitInt64(uint64_t Value) const; 296 297 /// EmitString - Emit a string with quotes and a null terminator. 298 /// Special characters are emitted properly. 299 /// @verbatim (Eg. '\t') @endverbatim 300 void EmitString(const std::string &String) const; 301 void EmitString(const char *String, unsigned Size) const; 302 303 /// EmitFile - Emit a .file directive. 304 void EmitFile(unsigned Number, const std::string &Name) const; 305 306 //===------------------------------------------------------------------===// 307 308 /// EmitAlignment - Emit an alignment directive to the specified power of 309 /// two boundary. For example, if you pass in 3 here, you will get an 8 310 /// byte alignment. If a global value is specified, and if that global has 311 /// an explicit alignment requested, it will unconditionally override the 312 /// alignment request. However, if ForcedAlignBits is specified, this value 313 /// has final say: the ultimate alignment will be the max of ForcedAlignBits 314 /// and the alignment computed with NumBits and the global. If UseFillExpr 315 /// is true, it also emits an optional second value FillValue which the 316 /// assembler uses to fill gaps to match alignment for text sections if the 317 /// has specified a non-zero fill value. 318 /// 319 /// The algorithm is: 320 /// Align = NumBits; 321 /// if (GV && GV->hasalignment) Align = GV->getalignment(); 322 /// Align = std::max(Align, ForcedAlignBits); 323 /// 324 void EmitAlignment(unsigned NumBits, const GlobalValue *GV = 0, 325 unsigned ForcedAlignBits = 0, 326 bool UseFillExpr = true) const; 327 328 /// printLabel - This method prints a local label used by debug and 329 /// exception handling tables. 330 void printLabel(const MachineInstr *MI) const; 331 void printLabel(unsigned Id) const; 332 333 /// printDeclare - This method prints a local variable declaration used by 334 /// debug tables. 335 void printDeclare(const MachineInstr *MI) const; 336 337 /// EmitComments - Pretty-print comments for instructions 338 void EmitComments(const MachineInstr &MI) const; 339 /// EmitComments - Pretty-print comments for basic blocks 340 void EmitComments(const MachineBasicBlock &MBB) const; 341 342 /// GetMBBSymbol - Return the MCSymbol corresponding to the specified basic 343 /// block label. 344 MCSymbol *GetMBBSymbol(unsigned MBBID) const; 345 346 /// GetBlockAddressSymbol - Return the MCSymbol used to satisfy BlockAddress 347 /// uses of the specified basic block. 348 MCSymbol *GetBlockAddressSymbol(const BlockAddress *BA) const; 349 MCSymbol *GetBlockAddressSymbol(const Function *F, 350 const BasicBlock *BB) const; 351 352 /// EmitBasicBlockStart - This method prints the label for the specified 353 /// MachineBasicBlock, an alignment (if present) and a comment describing 354 /// it if appropriate. 355 void EmitBasicBlockStart(const MachineBasicBlock *MBB) const; 356 protected: 357 /// EmitZeros - Emit a block of zeros. 358 /// 359 void EmitZeros(uint64_t NumZeros, unsigned AddrSpace = 0) const; 360 361 /// EmitString - Emit a zero-byte-terminated string constant. 362 /// 363 virtual void EmitString(const ConstantArray *CVA) const; 364 365 /// EmitConstantValueOnly - Print out the specified constant, without a 366 /// storage class. Only constants of first-class type are allowed here. 367 void EmitConstantValueOnly(const Constant *CV); 368 369 /// EmitGlobalConstant - Print a general LLVM constant to the .s file. 370 void EmitGlobalConstant(const Constant* CV, unsigned AddrSpace = 0); 371 372 virtual void EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV); 373 374 /// processDebugLoc - Processes the debug information of each machine 375 /// instruction's DebugLoc. 376 void processDebugLoc(const MachineInstr *MI, bool BeforePrintingInsn); 377 378 /// printInlineAsm - This method formats and prints the specified machine 379 /// instruction that is an inline asm. 380 void printInlineAsm(const MachineInstr *MI) const; 381 382 /// printImplicitDef - This method prints the specified machine instruction 383 /// that is an implicit def. 384 void printImplicitDef(const MachineInstr *MI) const; 385 386 /// printKill - This method prints the specified kill machine instruction. 387 void printKill(const MachineInstr *MI) const; 388 389 /// printPICJumpTableSetLabel - This method prints a set label for the 390 /// specified MachineBasicBlock for a jumptable entry. 391 virtual void printPICJumpTableSetLabel(unsigned uid, 392 const MachineBasicBlock *MBB) const; 393 virtual void printPICJumpTableSetLabel(unsigned uid, unsigned uid2, 394 const MachineBasicBlock *MBB) const; 395 virtual void printPICJumpTableEntry(const MachineJumpTableInfo *MJTI, 396 const MachineBasicBlock *MBB, 397 unsigned uid) const; 398 399 /// printDataDirective - This method prints the asm directive for the 400 /// specified type. 401 void printDataDirective(const Type *type, unsigned AddrSpace = 0); 402 403 /// printVisibility - This prints visibility information about symbol, if 404 /// this is suported by the target. 405 void printVisibility(const std::string& Name, unsigned Visibility) const; 406 407 /// printOffset - This is just convenient handler for printing offsets. 408 void printOffset(int64_t Offset) const; 409 410 private: 411 void EmitLLVMUsedList(Constant *List); 412 void EmitXXStructorList(Constant *List); 413 void EmitGlobalConstantStruct(const ConstantStruct* CVS, 414 unsigned AddrSpace); 415 void EmitGlobalConstantArray(const ConstantArray* CVA, unsigned AddrSpace); 416 void EmitGlobalConstantVector(const ConstantVector* CP); 417 void EmitGlobalConstantFP(const ConstantFP* CFP, unsigned AddrSpace); 418 void EmitGlobalConstantLargeInt(const ConstantInt* CI, unsigned AddrSpace); 419 GCMetadataPrinter *GetOrCreateGCPrinter(GCStrategy *C); 420 }; 421} 422 423#endif 424