1//===-- CodeGen/MachineFrameInfo.h - Abstract Stack Frame Rep. --*- 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// The file defines the MachineFrameInfo class. 11// 12//===----------------------------------------------------------------------===// 13 14#ifndef LLVM_CODEGEN_MACHINEFRAMEINFO_H 15#define LLVM_CODEGEN_MACHINEFRAMEINFO_H 16 17#include "llvm/ADT/SmallVector.h" 18#include "llvm/Support/DataTypes.h" 19#include <cassert> 20#include <vector> 21 22namespace llvm { 23class raw_ostream; 24class TargetData; 25class TargetRegisterClass; 26class Type; 27class MachineFunction; 28class MachineBasicBlock; 29class TargetFrameLowering; 30class BitVector; 31class Value; 32class AllocaInst; 33 34/// The CalleeSavedInfo class tracks the information need to locate where a 35/// callee saved register is in the current frame. 36class CalleeSavedInfo { 37 unsigned Reg; 38 int FrameIdx; 39 40public: 41 explicit CalleeSavedInfo(unsigned R, int FI = 0) 42 : Reg(R), FrameIdx(FI) {} 43 44 // Accessors. 45 unsigned getReg() const { return Reg; } 46 int getFrameIdx() const { return FrameIdx; } 47 void setFrameIdx(int FI) { FrameIdx = FI; } 48}; 49 50/// The MachineFrameInfo class represents an abstract stack frame until 51/// prolog/epilog code is inserted. This class is key to allowing stack frame 52/// representation optimizations, such as frame pointer elimination. It also 53/// allows more mundane (but still important) optimizations, such as reordering 54/// of abstract objects on the stack frame. 55/// 56/// To support this, the class assigns unique integer identifiers to stack 57/// objects requested clients. These identifiers are negative integers for 58/// fixed stack objects (such as arguments passed on the stack) or nonnegative 59/// for objects that may be reordered. Instructions which refer to stack 60/// objects use a special MO_FrameIndex operand to represent these frame 61/// indexes. 62/// 63/// Because this class keeps track of all references to the stack frame, it 64/// knows when a variable sized object is allocated on the stack. This is the 65/// sole condition which prevents frame pointer elimination, which is an 66/// important optimization on register-poor architectures. Because original 67/// variable sized alloca's in the source program are the only source of 68/// variable sized stack objects, it is safe to decide whether there will be 69/// any variable sized objects before all stack objects are known (for 70/// example, register allocator spill code never needs variable sized 71/// objects). 72/// 73/// When prolog/epilog code emission is performed, the final stack frame is 74/// built and the machine instructions are modified to refer to the actual 75/// stack offsets of the object, eliminating all MO_FrameIndex operands from 76/// the program. 77/// 78/// @brief Abstract Stack Frame Information 79class MachineFrameInfo { 80 81 // StackObject - Represent a single object allocated on the stack. 82 struct StackObject { 83 // SPOffset - The offset of this object from the stack pointer on entry to 84 // the function. This field has no meaning for a variable sized element. 85 int64_t SPOffset; 86 87 // The size of this object on the stack. 0 means a variable sized object, 88 // ~0ULL means a dead object. 89 uint64_t Size; 90 91 // Alignment - The required alignment of this stack slot. 92 unsigned Alignment; 93 94 // isImmutable - If true, the value of the stack object is set before 95 // entering the function and is not modified inside the function. By 96 // default, fixed objects are immutable unless marked otherwise. 97 bool isImmutable; 98 99 // isSpillSlot - If true the stack object is used as spill slot. It 100 // cannot alias any other memory objects. 101 bool isSpillSlot; 102 103 // MayNeedSP - If true the stack object triggered the creation of the stack 104 // protector. We should allocate this object right after the stack 105 // protector. 106 bool MayNeedSP; 107 108 /// Alloca - If this stack object is originated from an Alloca instruction 109 /// this value saves the original IR allocation. Can be NULL. 110 const AllocaInst *Alloca; 111 112 // PreAllocated - If true, the object was mapped into the local frame 113 // block and doesn't need additional handling for allocation beyond that. 114 bool PreAllocated; 115 116 StackObject(uint64_t Sz, unsigned Al, int64_t SP, bool IM, 117 bool isSS, bool NSP, const AllocaInst *Val) 118 : SPOffset(SP), Size(Sz), Alignment(Al), isImmutable(IM), 119 isSpillSlot(isSS), MayNeedSP(NSP), Alloca(Val), PreAllocated(false) {} 120 }; 121 122 /// Objects - The list of stack objects allocated... 123 /// 124 std::vector<StackObject> Objects; 125 126 /// NumFixedObjects - This contains the number of fixed objects contained on 127 /// the stack. Because fixed objects are stored at a negative index in the 128 /// Objects list, this is also the index to the 0th object in the list. 129 /// 130 unsigned NumFixedObjects; 131 132 /// HasVarSizedObjects - This boolean keeps track of whether any variable 133 /// sized objects have been allocated yet. 134 /// 135 bool HasVarSizedObjects; 136 137 /// FrameAddressTaken - This boolean keeps track of whether there is a call 138 /// to builtin \@llvm.frameaddress. 139 bool FrameAddressTaken; 140 141 /// ReturnAddressTaken - This boolean keeps track of whether there is a call 142 /// to builtin \@llvm.returnaddress. 143 bool ReturnAddressTaken; 144 145 /// StackSize - The prolog/epilog code inserter calculates the final stack 146 /// offsets for all of the fixed size objects, updating the Objects list 147 /// above. It then updates StackSize to contain the number of bytes that need 148 /// to be allocated on entry to the function. 149 /// 150 uint64_t StackSize; 151 152 /// OffsetAdjustment - The amount that a frame offset needs to be adjusted to 153 /// have the actual offset from the stack/frame pointer. The exact usage of 154 /// this is target-dependent, but it is typically used to adjust between 155 /// SP-relative and FP-relative offsets. E.G., if objects are accessed via 156 /// SP then OffsetAdjustment is zero; if FP is used, OffsetAdjustment is set 157 /// to the distance between the initial SP and the value in FP. For many 158 /// targets, this value is only used when generating debug info (via 159 /// TargetRegisterInfo::getFrameIndexOffset); when generating code, the 160 /// corresponding adjustments are performed directly. 161 int OffsetAdjustment; 162 163 /// MaxAlignment - The prolog/epilog code inserter may process objects 164 /// that require greater alignment than the default alignment the target 165 /// provides. To handle this, MaxAlignment is set to the maximum alignment 166 /// needed by the objects on the current frame. If this is greater than the 167 /// native alignment maintained by the compiler, dynamic alignment code will 168 /// be needed. 169 /// 170 unsigned MaxAlignment; 171 172 /// AdjustsStack - Set to true if this function adjusts the stack -- e.g., 173 /// when calling another function. This is only valid during and after 174 /// prolog/epilog code insertion. 175 bool AdjustsStack; 176 177 /// HasCalls - Set to true if this function has any function calls. 178 bool HasCalls; 179 180 /// StackProtectorIdx - The frame index for the stack protector. 181 int StackProtectorIdx; 182 183 /// FunctionContextIdx - The frame index for the function context. Used for 184 /// SjLj exceptions. 185 int FunctionContextIdx; 186 187 /// MaxCallFrameSize - This contains the size of the largest call frame if the 188 /// target uses frame setup/destroy pseudo instructions (as defined in the 189 /// TargetFrameInfo class). This information is important for frame pointer 190 /// elimination. If is only valid during and after prolog/epilog code 191 /// insertion. 192 /// 193 unsigned MaxCallFrameSize; 194 195 /// CSInfo - The prolog/epilog code inserter fills in this vector with each 196 /// callee saved register saved in the frame. Beyond its use by the prolog/ 197 /// epilog code inserter, this data used for debug info and exception 198 /// handling. 199 std::vector<CalleeSavedInfo> CSInfo; 200 201 /// CSIValid - Has CSInfo been set yet? 202 bool CSIValid; 203 204 /// TargetFrameLowering - Target information about frame layout. 205 /// 206 const TargetFrameLowering &TFI; 207 208 /// LocalFrameObjects - References to frame indices which are mapped 209 /// into the local frame allocation block. <FrameIdx, LocalOffset> 210 SmallVector<std::pair<int, int64_t>, 32> LocalFrameObjects; 211 212 /// LocalFrameSize - Size of the pre-allocated local frame block. 213 int64_t LocalFrameSize; 214 215 /// Required alignment of the local object blob, which is the strictest 216 /// alignment of any object in it. 217 unsigned LocalFrameMaxAlign; 218 219 /// Whether the local object blob needs to be allocated together. If not, 220 /// PEI should ignore the isPreAllocated flags on the stack objects and 221 /// just allocate them normally. 222 bool UseLocalStackAllocationBlock; 223 224public: 225 explicit MachineFrameInfo(const TargetFrameLowering &tfi) : TFI(tfi) { 226 StackSize = NumFixedObjects = OffsetAdjustment = MaxAlignment = 0; 227 HasVarSizedObjects = false; 228 FrameAddressTaken = false; 229 ReturnAddressTaken = false; 230 AdjustsStack = false; 231 HasCalls = false; 232 StackProtectorIdx = -1; 233 FunctionContextIdx = -1; 234 MaxCallFrameSize = 0; 235 CSIValid = false; 236 LocalFrameSize = 0; 237 LocalFrameMaxAlign = 0; 238 UseLocalStackAllocationBlock = false; 239 } 240 241 /// hasStackObjects - Return true if there are any stack objects in this 242 /// function. 243 /// 244 bool hasStackObjects() const { return !Objects.empty(); } 245 246 /// hasVarSizedObjects - This method may be called any time after instruction 247 /// selection is complete to determine if the stack frame for this function 248 /// contains any variable sized objects. 249 /// 250 bool hasVarSizedObjects() const { return HasVarSizedObjects; } 251 252 /// getStackProtectorIndex/setStackProtectorIndex - Return the index for the 253 /// stack protector object. 254 /// 255 int getStackProtectorIndex() const { return StackProtectorIdx; } 256 void setStackProtectorIndex(int I) { StackProtectorIdx = I; } 257 258 /// getFunctionContextIndex/setFunctionContextIndex - Return the index for the 259 /// function context object. This object is used for SjLj exceptions. 260 int getFunctionContextIndex() const { return FunctionContextIdx; } 261 void setFunctionContextIndex(int I) { FunctionContextIdx = I; } 262 263 /// isFrameAddressTaken - This method may be called any time after instruction 264 /// selection is complete to determine if there is a call to 265 /// \@llvm.frameaddress in this function. 266 bool isFrameAddressTaken() const { return FrameAddressTaken; } 267 void setFrameAddressIsTaken(bool T) { FrameAddressTaken = T; } 268 269 /// isReturnAddressTaken - This method may be called any time after 270 /// instruction selection is complete to determine if there is a call to 271 /// \@llvm.returnaddress in this function. 272 bool isReturnAddressTaken() const { return ReturnAddressTaken; } 273 void setReturnAddressIsTaken(bool s) { ReturnAddressTaken = s; } 274 275 /// getObjectIndexBegin - Return the minimum frame object index. 276 /// 277 int getObjectIndexBegin() const { return -NumFixedObjects; } 278 279 /// getObjectIndexEnd - Return one past the maximum frame object index. 280 /// 281 int getObjectIndexEnd() const { return (int)Objects.size()-NumFixedObjects; } 282 283 /// getNumFixedObjects - Return the number of fixed objects. 284 unsigned getNumFixedObjects() const { return NumFixedObjects; } 285 286 /// getNumObjects - Return the number of objects. 287 /// 288 unsigned getNumObjects() const { return Objects.size(); } 289 290 /// mapLocalFrameObject - Map a frame index into the local object block 291 void mapLocalFrameObject(int ObjectIndex, int64_t Offset) { 292 LocalFrameObjects.push_back(std::pair<int, int64_t>(ObjectIndex, Offset)); 293 Objects[ObjectIndex + NumFixedObjects].PreAllocated = true; 294 } 295 296 /// getLocalFrameObjectMap - Get the local offset mapping for a for an object 297 std::pair<int, int64_t> getLocalFrameObjectMap(int i) { 298 assert (i >= 0 && (unsigned)i < LocalFrameObjects.size() && 299 "Invalid local object reference!"); 300 return LocalFrameObjects[i]; 301 } 302 303 /// getLocalFrameObjectCount - Return the number of objects allocated into 304 /// the local object block. 305 int64_t getLocalFrameObjectCount() { return LocalFrameObjects.size(); } 306 307 /// setLocalFrameSize - Set the size of the local object blob. 308 void setLocalFrameSize(int64_t sz) { LocalFrameSize = sz; } 309 310 /// getLocalFrameSize - Get the size of the local object blob. 311 int64_t getLocalFrameSize() const { return LocalFrameSize; } 312 313 /// setLocalFrameMaxAlign - Required alignment of the local object blob, 314 /// which is the strictest alignment of any object in it. 315 void setLocalFrameMaxAlign(unsigned Align) { LocalFrameMaxAlign = Align; } 316 317 /// getLocalFrameMaxAlign - Return the required alignment of the local 318 /// object blob. 319 unsigned getLocalFrameMaxAlign() const { return LocalFrameMaxAlign; } 320 321 /// getUseLocalStackAllocationBlock - Get whether the local allocation blob 322 /// should be allocated together or let PEI allocate the locals in it 323 /// directly. 324 bool getUseLocalStackAllocationBlock() {return UseLocalStackAllocationBlock;} 325 326 /// setUseLocalStackAllocationBlock - Set whether the local allocation blob 327 /// should be allocated together or let PEI allocate the locals in it 328 /// directly. 329 void setUseLocalStackAllocationBlock(bool v) { 330 UseLocalStackAllocationBlock = v; 331 } 332 333 /// isObjectPreAllocated - Return true if the object was pre-allocated into 334 /// the local block. 335 bool isObjectPreAllocated(int ObjectIdx) const { 336 assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() && 337 "Invalid Object Idx!"); 338 return Objects[ObjectIdx+NumFixedObjects].PreAllocated; 339 } 340 341 /// getObjectSize - Return the size of the specified object. 342 /// 343 int64_t getObjectSize(int ObjectIdx) const { 344 assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() && 345 "Invalid Object Idx!"); 346 return Objects[ObjectIdx+NumFixedObjects].Size; 347 } 348 349 /// setObjectSize - Change the size of the specified stack object. 350 void setObjectSize(int ObjectIdx, int64_t Size) { 351 assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() && 352 "Invalid Object Idx!"); 353 Objects[ObjectIdx+NumFixedObjects].Size = Size; 354 } 355 356 /// getObjectAlignment - Return the alignment of the specified stack object. 357 unsigned getObjectAlignment(int ObjectIdx) const { 358 assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() && 359 "Invalid Object Idx!"); 360 return Objects[ObjectIdx+NumFixedObjects].Alignment; 361 } 362 363 /// setObjectAlignment - Change the alignment of the specified stack object. 364 void setObjectAlignment(int ObjectIdx, unsigned Align) { 365 assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() && 366 "Invalid Object Idx!"); 367 Objects[ObjectIdx+NumFixedObjects].Alignment = Align; 368 ensureMaxAlignment(Align); 369 } 370 371 /// getObjectAllocation - Return the underlying Alloca of the specified 372 /// stack object if it exists. Returns 0 if none exists. 373 const AllocaInst* getObjectAllocation(int ObjectIdx) const { 374 assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() && 375 "Invalid Object Idx!"); 376 return Objects[ObjectIdx+NumFixedObjects].Alloca; 377 } 378 379 /// NeedsStackProtector - Returns true if the object may need stack 380 /// protectors. 381 bool MayNeedStackProtector(int ObjectIdx) const { 382 assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() && 383 "Invalid Object Idx!"); 384 return Objects[ObjectIdx+NumFixedObjects].MayNeedSP; 385 } 386 387 /// getObjectOffset - Return the assigned stack offset of the specified object 388 /// from the incoming stack pointer. 389 /// 390 int64_t getObjectOffset(int ObjectIdx) const { 391 assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() && 392 "Invalid Object Idx!"); 393 assert(!isDeadObjectIndex(ObjectIdx) && 394 "Getting frame offset for a dead object?"); 395 return Objects[ObjectIdx+NumFixedObjects].SPOffset; 396 } 397 398 /// setObjectOffset - Set the stack frame offset of the specified object. The 399 /// offset is relative to the stack pointer on entry to the function. 400 /// 401 void setObjectOffset(int ObjectIdx, int64_t SPOffset) { 402 assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() && 403 "Invalid Object Idx!"); 404 assert(!isDeadObjectIndex(ObjectIdx) && 405 "Setting frame offset for a dead object?"); 406 Objects[ObjectIdx+NumFixedObjects].SPOffset = SPOffset; 407 } 408 409 /// getStackSize - Return the number of bytes that must be allocated to hold 410 /// all of the fixed size frame objects. This is only valid after 411 /// Prolog/Epilog code insertion has finalized the stack frame layout. 412 /// 413 uint64_t getStackSize() const { return StackSize; } 414 415 /// setStackSize - Set the size of the stack... 416 /// 417 void setStackSize(uint64_t Size) { StackSize = Size; } 418 419 /// getOffsetAdjustment - Return the correction for frame offsets. 420 /// 421 int getOffsetAdjustment() const { return OffsetAdjustment; } 422 423 /// setOffsetAdjustment - Set the correction for frame offsets. 424 /// 425 void setOffsetAdjustment(int Adj) { OffsetAdjustment = Adj; } 426 427 /// getMaxAlignment - Return the alignment in bytes that this function must be 428 /// aligned to, which is greater than the default stack alignment provided by 429 /// the target. 430 /// 431 unsigned getMaxAlignment() const { return MaxAlignment; } 432 433 /// ensureMaxAlignment - Make sure the function is at least Align bytes 434 /// aligned. 435 void ensureMaxAlignment(unsigned Align) { 436 if (MaxAlignment < Align) MaxAlignment = Align; 437 } 438 439 /// AdjustsStack - Return true if this function adjusts the stack -- e.g., 440 /// when calling another function. This is only valid during and after 441 /// prolog/epilog code insertion. 442 bool adjustsStack() const { return AdjustsStack; } 443 void setAdjustsStack(bool V) { AdjustsStack = V; } 444 445 /// hasCalls - Return true if the current function has any function calls. 446 bool hasCalls() const { return HasCalls; } 447 void setHasCalls(bool V) { HasCalls = V; } 448 449 /// getMaxCallFrameSize - Return the maximum size of a call frame that must be 450 /// allocated for an outgoing function call. This is only available if 451 /// CallFrameSetup/Destroy pseudo instructions are used by the target, and 452 /// then only during or after prolog/epilog code insertion. 453 /// 454 unsigned getMaxCallFrameSize() const { return MaxCallFrameSize; } 455 void setMaxCallFrameSize(unsigned S) { MaxCallFrameSize = S; } 456 457 /// CreateFixedObject - Create a new object at a fixed location on the stack. 458 /// All fixed objects should be created before other objects are created for 459 /// efficiency. By default, fixed objects are immutable. This returns an 460 /// index with a negative value. 461 /// 462 int CreateFixedObject(uint64_t Size, int64_t SPOffset, bool Immutable); 463 464 465 /// isFixedObjectIndex - Returns true if the specified index corresponds to a 466 /// fixed stack object. 467 bool isFixedObjectIndex(int ObjectIdx) const { 468 return ObjectIdx < 0 && (ObjectIdx >= -(int)NumFixedObjects); 469 } 470 471 /// isImmutableObjectIndex - Returns true if the specified index corresponds 472 /// to an immutable object. 473 bool isImmutableObjectIndex(int ObjectIdx) const { 474 assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() && 475 "Invalid Object Idx!"); 476 return Objects[ObjectIdx+NumFixedObjects].isImmutable; 477 } 478 479 /// isSpillSlotObjectIndex - Returns true if the specified index corresponds 480 /// to a spill slot.. 481 bool isSpillSlotObjectIndex(int ObjectIdx) const { 482 assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() && 483 "Invalid Object Idx!"); 484 return Objects[ObjectIdx+NumFixedObjects].isSpillSlot; 485 } 486 487 /// isDeadObjectIndex - Returns true if the specified index corresponds to 488 /// a dead object. 489 bool isDeadObjectIndex(int ObjectIdx) const { 490 assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() && 491 "Invalid Object Idx!"); 492 return Objects[ObjectIdx+NumFixedObjects].Size == ~0ULL; 493 } 494 495 /// CreateStackObject - Create a new statically sized stack object, returning 496 /// a nonnegative identifier to represent it. 497 /// 498 int CreateStackObject(uint64_t Size, unsigned Alignment, bool isSS, 499 bool MayNeedSP = false, const AllocaInst *Alloca = 0) { 500 assert(Size != 0 && "Cannot allocate zero size stack objects!"); 501 Objects.push_back(StackObject(Size, Alignment, 0, false, isSS, MayNeedSP, 502 Alloca)); 503 int Index = (int)Objects.size() - NumFixedObjects - 1; 504 assert(Index >= 0 && "Bad frame index!"); 505 ensureMaxAlignment(Alignment); 506 return Index; 507 } 508 509 /// CreateSpillStackObject - Create a new statically sized stack object that 510 /// represents a spill slot, returning a nonnegative identifier to represent 511 /// it. 512 /// 513 int CreateSpillStackObject(uint64_t Size, unsigned Alignment) { 514 CreateStackObject(Size, Alignment, true, false); 515 int Index = (int)Objects.size() - NumFixedObjects - 1; 516 ensureMaxAlignment(Alignment); 517 return Index; 518 } 519 520 /// RemoveStackObject - Remove or mark dead a statically sized stack object. 521 /// 522 void RemoveStackObject(int ObjectIdx) { 523 // Mark it dead. 524 Objects[ObjectIdx+NumFixedObjects].Size = ~0ULL; 525 } 526 527 /// CreateVariableSizedObject - Notify the MachineFrameInfo object that a 528 /// variable sized object has been created. This must be created whenever a 529 /// variable sized object is created, whether or not the index returned is 530 /// actually used. 531 /// 532 int CreateVariableSizedObject(unsigned Alignment) { 533 HasVarSizedObjects = true; 534 Objects.push_back(StackObject(0, Alignment, 0, false, false, true, 0)); 535 ensureMaxAlignment(Alignment); 536 return (int)Objects.size()-NumFixedObjects-1; 537 } 538 539 /// getCalleeSavedInfo - Returns a reference to call saved info vector for the 540 /// current function. 541 const std::vector<CalleeSavedInfo> &getCalleeSavedInfo() const { 542 return CSInfo; 543 } 544 545 /// setCalleeSavedInfo - Used by prolog/epilog inserter to set the function's 546 /// callee saved information. 547 void setCalleeSavedInfo(const std::vector<CalleeSavedInfo> &CSI) { 548 CSInfo = CSI; 549 } 550 551 /// isCalleeSavedInfoValid - Has the callee saved info been calculated yet? 552 bool isCalleeSavedInfoValid() const { return CSIValid; } 553 554 void setCalleeSavedInfoValid(bool v) { CSIValid = v; } 555 556 /// getPristineRegs - Return a set of physical registers that are pristine on 557 /// entry to the MBB. 558 /// 559 /// Pristine registers hold a value that is useless to the current function, 560 /// but that must be preserved - they are callee saved registers that have not 561 /// been saved yet. 562 /// 563 /// Before the PrologueEpilogueInserter has placed the CSR spill code, this 564 /// method always returns an empty set. 565 BitVector getPristineRegs(const MachineBasicBlock *MBB) const; 566 567 /// print - Used by the MachineFunction printer to print information about 568 /// stack objects. Implemented in MachineFunction.cpp 569 /// 570 void print(const MachineFunction &MF, raw_ostream &OS) const; 571 572 /// dump - Print the function to stderr. 573 void dump(const MachineFunction &MF) const; 574}; 575 576} // End llvm namespace 577 578#endif 579