lib/ExecutionEngine/Interpreter/ExternalFunctions.cpp

   1 //===-- ExternalFunctions.cpp - Implement External Functions --------------===//
   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 both code to deal with invoking "external" functions, but
  11 //  also contains code that implements "exported" external functions.
  12 //
  13 //  There are currently two mechanisms for handling external functions in the
  14 //  Interpreter.  The first is to implement lle_* wrapper functions that are
  15 //  specific to well-known library functions which manually translate the
  16 //  arguments from GenericValues and make the call.  If such a wrapper does
  17 //  not exist, and libffi is available, then the Interpreter will attempt to
  18 //  invoke the function using libffi, after finding its address.
  19 //
  20 //===----------------------------------------------------------------------===//
  21
  22 #include "Interpreter.h"
  23 #include "llvm/DerivedTypes.h"
  24 #include "llvm/Module.h"
  25 #include "llvm/Config/config.h"     // Detect libffi
  26 #include "llvm/Support/ErrorHandling.h"
  27 #include "llvm/System/DynamicLibrary.h"
  28 #include "llvm/Target/TargetData.h"
  29 #include "llvm/Support/ManagedStatic.h"
  30 #include "llvm/System/Mutex.h"
  31 #include <csignal>
  32 #include <cstdio>
  33 #include <map>
  34 #include <cmath>
  35 #include <cstring>
  36
  37 #ifdef HAVE_FFI_CALL
  38 #ifdef HAVE_FFI_H
  39 #include <ffi.h>
  40 #define USE_LIBFFI
  41 #elif HAVE_FFI_FFI_H
  42 #include <ffi/ffi.h>
  43 #define USE_LIBFFI
  44 #endif
  45 #endif
  46
  47 using namespace llvm;
  48
  49 static ManagedStatic<sys::Mutex> FunctionsLock;
  50
  51 typedef GenericValue (*ExFunc)(const FunctionType *,
  52                                const std::vector<GenericValue> &);
  53 static ManagedStatic<std::map<const Function *, ExFunc> > ExportedFunctions;
  54 static std::map<std::string, ExFunc> FuncNames;
  55
  56 #ifdef USE_LIBFFI
  57 typedef void (*RawFunc)();
  58 static ManagedStatic<std::map<const Function *, RawFunc> > RawFunctions;
  59 #endif
  60
  61 static Interpreter *TheInterpreter;
  62
  63 static char getTypeID(const Type *Ty) {
  64   switch (Ty->getTypeID()) {
  65   case Type::VoidTyID:    return 'V';
  66   case Type::IntegerTyID:
  67     switch (cast<IntegerType>(Ty)->getBitWidth()) {
  68       case 1:  return 'o';
  69       case 8:  return 'B';
  70       case 16: return 'S';
  71       case 32: return 'I';
  72       case 64: return 'L';
  73       default: return 'N';
  74     }
  75   case Type::FloatTyID:   return 'F';
  76   case Type::DoubleTyID:  return 'D';
  77   case Type::PointerTyID: return 'P';
  78   case Type::FunctionTyID:return 'M';
  79   case Type::StructTyID:  return 'T';
  80   case Type::ArrayTyID:   return 'A';
  81   case Type::OpaqueTyID:  return 'O';
  82   default: return 'U';
  83   }
  84 }
  85
  86 // Try to find address of external function given a Function object.
  87 // Please note, that interpreter doesn't know how to assemble a
  88 // real call in general case (this is JIT job), that's why it assumes,
  89 // that all external functions has the same (and pretty "general") signature.
  90 // The typical example of such functions are "lle_X_" ones.
  91 static ExFunc lookupFunction(const Function *F) {
  92   // Function not found, look it up... start by figuring out what the
  93   // composite function name should be.
  94   std::string ExtName = "lle_";
  95   const FunctionType *FT = F->getFunctionType();
  96   for (unsigned i = 0, e = FT->getNumContainedTypes(); i != e; ++i)
  97     ExtName += getTypeID(FT->getContainedType(i));
  98   ExtName + "_" + F->getNameStr();
  99
 100   sys::ScopedLock Writer(*FunctionsLock);
 101   ExFunc FnPtr = FuncNames[ExtName];
 102   if (FnPtr == 0)
 103     FnPtr = FuncNames["lle_X_" + F->getNameStr()];
 104   if (FnPtr == 0)  // Try calling a generic function... if it exists...
 105     FnPtr = (ExFunc)(intptr_t)
 106       sys::DynamicLibrary::SearchForAddressOfSymbol("lle_X_"+F->getNameStr());
 107   if (FnPtr != 0)
 108     ExportedFunctions->insert(std::make_pair(F, FnPtr));  // Cache for later
 109   return FnPtr;
 110 }
 111
 112 #ifdef USE_LIBFFI
 113 static ffi_type *ffiTypeFor(const Type *Ty) {
 114   switch (Ty->getTypeID()) {
 115     case Type::VoidTyID: return &ffi_type_void;
 116     case Type::IntegerTyID:
 117       switch (cast<IntegerType>(Ty)->getBitWidth()) {
 118         case 8:  return &ffi_type_sint8;
 119         case 16: return &ffi_type_sint16;
 120         case 32: return &ffi_type_sint32;
 121         case 64: return &ffi_type_sint64;
 122       }
 123     case Type::FloatTyID:   return &ffi_type_float;
 124     case Type::DoubleTyID:  return &ffi_type_double;
 125     case Type::PointerTyID: return &ffi_type_pointer;
 126     default: break;
 127   }
 128   // TODO: Support other types such as StructTyID, ArrayTyID, OpaqueTyID, etc.
 129   llvm_report_error("Type could not be mapped for use with libffi.");
 130   return NULL;
 131 }
 132
 133 static void *ffiValueFor(const Type *Ty, const GenericValue &AV,
 134                          void *ArgDataPtr) {
 135   switch (Ty->getTypeID()) {
 136     case Type::IntegerTyID:
 137       switch (cast<IntegerType>(Ty)->getBitWidth()) {
 138         case 8: {
 139           int8_t *I8Ptr = (int8_t *) ArgDataPtr;
 140           *I8Ptr = (int8_t) AV.IntVal.getZExtValue();
 141           return ArgDataPtr;
 142         }
 143         case 16: {
 144           int16_t *I16Ptr = (int16_t *) ArgDataPtr;
 145           *I16Ptr = (int16_t) AV.IntVal.getZExtValue();
 146           return ArgDataPtr;
 147         }
 148         case 32: {
 149           int32_t *I32Ptr = (int32_t *) ArgDataPtr;
 150           *I32Ptr = (int32_t) AV.IntVal.getZExtValue();
 151           return ArgDataPtr;
 152         }
 153         case 64: {
 154           int64_t *I64Ptr = (int64_t *) ArgDataPtr;
 155           *I64Ptr = (int64_t) AV.IntVal.getZExtValue();
 156           return ArgDataPtr;
 157         }
 158       }
 159     case Type::FloatTyID: {
 160       float *FloatPtr = (float *) ArgDataPtr;
 161       *FloatPtr = AV.DoubleVal;
 162       return ArgDataPtr;
 163     }
 164     case Type::DoubleTyID: {
 165       double *DoublePtr = (double *) ArgDataPtr;
 166       *DoublePtr = AV.DoubleVal;
 167       return ArgDataPtr;
 168     }
 169     case Type::PointerTyID: {
 170       void **PtrPtr = (void **) ArgDataPtr;
 171       *PtrPtr = GVTOP(AV);
 172       return ArgDataPtr;
 173     }
 174     default: break;
 175   }
 176   // TODO: Support other types such as StructTyID, ArrayTyID, OpaqueTyID, etc.
 177   llvm_report_error("Type value could not be mapped for use with libffi.");
 178   return NULL;
 179 }
 180
 181 static bool ffiInvoke(RawFunc Fn, Function *F,
 182                       const std::vector<GenericValue> &ArgVals,
 183                       const TargetData *TD, GenericValue &Result) {
 184   ffi_cif cif;
 185   const FunctionType *FTy = F->getFunctionType();
 186   const unsigned NumArgs = F->arg_size();
 187
 188   // TODO: We don't have type information about the remaining arguments, because
 189   // this information is never passed into ExecutionEngine::runFunction().
 190   if (ArgVals.size() > NumArgs && F->isVarArg()) {
 191     llvm_report_error("Calling external var arg function '" + F->getName()
 192                       + "' is not supported by the Interpreter.");
 193   }
 194
 195   unsigned ArgBytes = 0;
 196
 197   std::vector<ffi_type*> args(NumArgs);
 198   for (Function::const_arg_iterator A = F->arg_begin(), E = F->arg_end();
 199        A != E; ++A) {
 200     const unsigned ArgNo = A->getArgNo();
 201     const Type *ArgTy = FTy->getParamType(ArgNo);
 202     args[ArgNo] = ffiTypeFor(ArgTy);
 203     ArgBytes += TD->getTypeStoreSize(ArgTy);
 204   }
 205
 206   uint8_t *ArgData = (uint8_t*) alloca(ArgBytes);
 207   uint8_t *ArgDataPtr = ArgData;
 208   std::vector<void*> values(NumArgs);
 209   for (Function::const_arg_iterator A = F->arg_begin(), E = F->arg_end();
 210        A != E; ++A) {
 211     const unsigned ArgNo = A->getArgNo();
 212     const Type *ArgTy = FTy->getParamType(ArgNo);
 213     values[ArgNo] = ffiValueFor(ArgTy, ArgVals[ArgNo], ArgDataPtr);
 214     ArgDataPtr += TD->getTypeStoreSize(ArgTy);
 215   }
 216
 217   const Type *RetTy = FTy->getReturnType();
 218   ffi_type *rtype = ffiTypeFor(RetTy);
 219
 220   if (ffi_prep_cif(&cif, FFI_DEFAULT_ABI, NumArgs, rtype, &args[0]) == FFI_OK) {
 221     void *ret = NULL;
 222     if (RetTy->getTypeID() != Type::VoidTyID)
 223       ret = alloca(TD->getTypeStoreSize(RetTy));
 224     ffi_call(&cif, Fn, ret, &values[0]);
 225     switch (RetTy->getTypeID()) {
 226       case Type::IntegerTyID:
 227         switch (cast<IntegerType>(RetTy)->getBitWidth()) {
 228           case 8:  Result.IntVal = APInt(8 , *(int8_t *) ret); break;
 229           case 16: Result.IntVal = APInt(16, *(int16_t*) ret); break;
 230           case 32: Result.IntVal = APInt(32, *(int32_t*) ret); break;
 231           case 64: Result.IntVal = APInt(64, *(int64_t*) ret); break;
 232         }
 233         break;
 234       case Type::FloatTyID:   Result.FloatVal   = *(float *) ret; break;
 235       case Type::DoubleTyID:  Result.DoubleVal  = *(double*) ret; break;
 236       case Type::PointerTyID: Result.PointerVal = *(void **) ret; break;
 237       default: break;
 238     }
 239     return true;
 240   }
 241
 242   return false;
 243 }
 244 #endif // USE_LIBFFI
 245
 246 GenericValue Interpreter::callExternalFunction(Function *F,
 247                                      const std::vector<GenericValue> &ArgVals) {
 248   TheInterpreter = this;
 249
 250   FunctionsLock->acquire();
 251
 252   // Do a lookup to see if the function is in our cache... this should just be a
 253   // deferred annotation!
 254   std::map<const Function *, ExFunc>::iterator FI = ExportedFunctions->find(F);
 255   if (ExFunc Fn = (FI == ExportedFunctions->end()) ? lookupFunction(F)
 256                                                    : FI->second) {
 257     FunctionsLock->release();
 258     return Fn(F->getFunctionType(), ArgVals);
 259   }
 260
 261 #ifdef USE_LIBFFI
 262   std::map<const Function *, RawFunc>::iterator RF = RawFunctions->find(F);
 263   RawFunc RawFn;
 264   if (RF == RawFunctions->end()) {
 265     RawFn = (RawFunc)(intptr_t)
 266       sys::DynamicLibrary::SearchForAddressOfSymbol(F->getName());
 267     if (RawFn != 0)
 268       RawFunctions->insert(std::make_pair(F, RawFn));  // Cache for later
 269   } else {
 270     RawFn = RF->second;
 271   }
 272
 273   FunctionsLock->release();
 274
 275   GenericValue Result;
 276   if (RawFn != 0 && ffiInvoke(RawFn, F, ArgVals, getTargetData(), Result))
 277     return Result;
 278 #endif // USE_LIBFFI
 279
 280   if (F->getName() == "__main")
 281     errs() << "Tried to execute an unknown external function: "
 282       << F->getType()->getDescription() << " __main\n";
 283   else
 284     llvm_report_error("Tried to execute an unknown external function: " +
 285                       F->getType()->getDescription() + " " +F->getName());
 286   return GenericValue();
 287 }
 288
 289
 290 //===----------------------------------------------------------------------===//
 291 //  Functions "exported" to the running application...
 292 //
 293
 294 // Visual Studio warns about returning GenericValue in extern "C" linkage
 295 #ifdef _MSC_VER
 296     #pragma warning(disable : 4190)
 297 #endif
 298
 299 extern "C" {  // Don't add C++ manglings to llvm mangling :)
 300
 301 // void atexit(Function*)
 302 GenericValue lle_X_atexit(const FunctionType *FT,
 303                           const std::vector<GenericValue> &Args) {
 304   assert(Args.size() == 1);
 305   TheInterpreter->addAtExitHandler((Function*)GVTOP(Args[0]));
 306   GenericValue GV;
 307   GV.IntVal = 0;
 308   return GV;
 309 }
 310
 311 // void exit(int)
 312 GenericValue lle_X_exit(const FunctionType *FT,
 313                         const std::vector<GenericValue> &Args) {
 314   TheInterpreter->exitCalled(Args[0]);
 315   return GenericValue();
 316 }
 317
 318 // void abort(void)
 319 GenericValue lle_X_abort(const FunctionType *FT,
 320                          const std::vector<GenericValue> &Args) {
 321   //FIXME: should we report or raise here?
 322   //llvm_report_error("Interpreted program raised SIGABRT");
 323   raise (SIGABRT);
 324   return GenericValue();
 325 }
 326
 327 // int sprintf(char *, const char *, ...) - a very rough implementation to make
 328 // output useful.
 329 GenericValue lle_X_sprintf(const FunctionType *FT,
 330                            const std::vector<GenericValue> &Args) {
 331   char *OutputBuffer = (char *)GVTOP(Args[0]);
 332   const char *FmtStr = (const char *)GVTOP(Args[1]);
 333   unsigned ArgNo = 2;
 334
 335   // printf should return # chars printed.  This is completely incorrect, but
 336   // close enough for now.
 337   GenericValue GV;
 338   GV.IntVal = APInt(32, strlen(FmtStr));
 339   while (1) {
 340     switch (*FmtStr) {
 341     case 0: return GV;             // Null terminator...
 342     default:                       // Normal nonspecial character
 343       sprintf(OutputBuffer++, "%c", *FmtStr++);
 344       break;
 345     case '\\': {                   // Handle escape codes
 346       sprintf(OutputBuffer, "%c%c", *FmtStr, *(FmtStr+1));
 347       FmtStr += 2; OutputBuffer += 2;
 348       break;
 349     }
 350     case '%': {                    // Handle format specifiers
 351       char FmtBuf[100] = "", Buffer[1000] = "";
 352       char *FB = FmtBuf;
 353       *FB++ = *FmtStr++;
 354       char Last = *FB++ = *FmtStr++;
 355       unsigned HowLong = 0;
 356       while (Last != 'c' && Last != 'd' && Last != 'i' && Last != 'u' &&
 357              Last != 'o' && Last != 'x' && Last != 'X' && Last != 'e' &&
 358              Last != 'E' && Last != 'g' && Last != 'G' && Last != 'f' &&
 359              Last != 'p' && Last != 's' && Last != '%') {
 360         if (Last == 'l' || Last == 'L') HowLong++;  // Keep track of l's
 361         Last = *FB++ = *FmtStr++;
 362       }
 363       *FB = 0;
 364
 365       switch (Last) {
 366       case '%':
 367         strcpy(Buffer, "%"); break;
 368       case 'c':
 369         sprintf(Buffer, FmtBuf, uint32_t(Args[ArgNo++].IntVal.getZExtValue()));
 370         break;
 371       case 'd': case 'i':
 372       case 'u': case 'o':
 373       case 'x': case 'X':
 374         if (HowLong >= 1) {
 375           if (HowLong == 1 &&
 376               TheInterpreter->getTargetData()->getPointerSizeInBits() == 64 &&
 377               sizeof(long) < sizeof(int64_t)) {
 378             // Make sure we use %lld with a 64 bit argument because we might be
 379             // compiling LLI on a 32 bit compiler.
 380             unsigned Size = strlen(FmtBuf);
 381             FmtBuf[Size] = FmtBuf[Size-1];
 382             FmtBuf[Size+1] = 0;
 383             FmtBuf[Size-1] = 'l';
 384           }
 385           sprintf(Buffer, FmtBuf, Args[ArgNo++].IntVal.getZExtValue());
 386         } else
 387           sprintf(Buffer, FmtBuf,uint32_t(Args[ArgNo++].IntVal.getZExtValue()));
 388         break;
 389       case 'e': case 'E': case 'g': case 'G': case 'f':
 390         sprintf(Buffer, FmtBuf, Args[ArgNo++].DoubleVal); break;
 391       case 'p':
 392         sprintf(Buffer, FmtBuf, (void*)GVTOP(Args[ArgNo++])); break;
 393       case 's':
 394         sprintf(Buffer, FmtBuf, (char*)GVTOP(Args[ArgNo++])); break;
 395       default:
 396         errs() << "<unknown printf code '" << *FmtStr << "'!>";
 397         ArgNo++; break;
 398       }
 399       strcpy(OutputBuffer, Buffer);
 400       OutputBuffer += strlen(Buffer);
 401       }
 402       break;
 403     }
 404   }
 405   return GV;
 406 }
 407
 408 // int printf(const char *, ...) - a very rough implementation to make output
 409 // useful.
 410 GenericValue lle_X_printf(const FunctionType *FT,
 411                           const std::vector<GenericValue> &Args) {
 412   char Buffer[10000];
 413   std::vector<GenericValue> NewArgs;
 414   NewArgs.push_back(PTOGV((void*)&Buffer[0]));
 415   NewArgs.insert(NewArgs.end(), Args.begin(), Args.end());
 416   GenericValue GV = lle_X_sprintf(FT, NewArgs);
 417   outs() << Buffer;
 418   return GV;
 419 }
 420
 421 static void ByteswapSCANFResults(LLVMContext &C,
 422                                  const char *Fmt, void *Arg0, void *Arg1,
 423                                  void *Arg2, void *Arg3, void *Arg4, void *Arg5,
 424                                  void *Arg6, void *Arg7, void *Arg8) {
 425   void *Args[] = { Arg0, Arg1, Arg2, Arg3, Arg4, Arg5, Arg6, Arg7, Arg8, 0 };
 426
 427   // Loop over the format string, munging read values as appropriate (performs
 428   // byteswaps as necessary).
 429   unsigned ArgNo = 0;
 430   while (*Fmt) {
 431     if (*Fmt++ == '%') {
 432       // Read any flag characters that may be present...
 433       bool Suppress = false;
 434       bool Half = false;
 435       bool Long = false;
 436       bool LongLong = false;  // long long or long double
 437
 438       while (1) {
 439         switch (*Fmt++) {
 440         case '*': Suppress = true; break;
 441         case 'a': /*Allocate = true;*/ break;  // We don't need to track this
 442         case 'h': Half = true; break;
 443         case 'l': Long = true; break;
 444         case 'q':
 445         case 'L': LongLong = true; break;
 446         default:
 447           if (Fmt[-1] > '9' || Fmt[-1] < '0')   // Ignore field width specs
 448             goto Out;
 449         }
 450       }
 451     Out:
 452
 453       // Read the conversion character
 454       if (!Suppress && Fmt[-1] != '%') { // Nothing to do?
 455         unsigned Size = 0;
 456         const Type *Ty = 0;
 457
 458         switch (Fmt[-1]) {
 459         case 'i': case 'o': case 'u': case 'x': case 'X': case 'n': case 'p':
 460         case 'd':
 461           if (Long || LongLong) {
 462             Size = 8; Ty = Type::getInt64Ty(C);
 463           } else if (Half) {
 464             Size = 4; Ty = Type::getInt16Ty(C);
 465           } else {
 466             Size = 4; Ty = Type::getInt32Ty(C);
 467           }
 468           break;
 469
 470         case 'e': case 'g': case 'E':
 471         case 'f':
 472           if (Long || LongLong) {
 473             Size = 8; Ty = Type::getDoubleTy(C);
 474           } else {
 475             Size = 4; Ty = Type::getFloatTy(C);
 476           }
 477           break;
 478
 479         case 's': case 'c': case '[':  // No byteswap needed
 480           Size = 1;
 481           Ty = Type::getInt8Ty(C);
 482           break;
 483
 484         default: break;
 485         }
 486
 487         if (Size) {
 488           GenericValue GV;
 489           void *Arg = Args[ArgNo++];
 490           memcpy(&GV, Arg, Size);
 491           TheInterpreter->StoreValueToMemory(GV, (GenericValue*)Arg, Ty);
 492         }
 493       }
 494     }
 495   }
 496 }
 497
 498 // int sscanf(const char *format, ...);
 499 GenericValue lle_X_sscanf(const FunctionType *FT,
 500                           const std::vector<GenericValue> &args) {
 501   assert(args.size() < 10 && "Only handle up to 10 args to sscanf right now!");
 502
 503   char *Args[10];
 504   for (unsigned i = 0; i < args.size(); ++i)
 505     Args[i] = (char*)GVTOP(args[i]);
 506
 507   GenericValue GV;
 508   GV.IntVal = APInt(32, sscanf(Args[0], Args[1], Args[2], Args[3], Args[4],
 509                         Args[5], Args[6], Args[7], Args[8], Args[9]));
 510   ByteswapSCANFResults(FT->getContext(),
 511                        Args[1], Args[2], Args[3], Args[4],
 512                        Args[5], Args[6], Args[7], Args[8], Args[9], 0);
 513   return GV;
 514 }
 515
 516 // int scanf(const char *format, ...);
 517 GenericValue lle_X_scanf(const FunctionType *FT,
 518                          const std::vector<GenericValue> &args) {
 519   assert(args.size() < 10 && "Only handle up to 10 args to scanf right now!");
 520
 521   char *Args[10];
 522   for (unsigned i = 0; i < args.size(); ++i)
 523     Args[i] = (char*)GVTOP(args[i]);
 524
 525   GenericValue GV;
 526   GV.IntVal = APInt(32, scanf( Args[0], Args[1], Args[2], Args[3], Args[4],
 527                         Args[5], Args[6], Args[7], Args[8], Args[9]));
 528   ByteswapSCANFResults(FT->getContext(),
 529                        Args[0], Args[1], Args[2], Args[3], Args[4],
 530                        Args[5], Args[6], Args[7], Args[8], Args[9]);
 531   return GV;
 532 }
 533
 534 // int fprintf(FILE *, const char *, ...) - a very rough implementation to make
 535 // output useful.
 536 GenericValue lle_X_fprintf(const FunctionType *FT,
 537                            const std::vector<GenericValue> &Args) {
 538   assert(Args.size() >= 2);
 539   char Buffer[10000];
 540   std::vector<GenericValue> NewArgs;
 541   NewArgs.push_back(PTOGV(Buffer));
 542   NewArgs.insert(NewArgs.end(), Args.begin()+1, Args.end());
 543   GenericValue GV = lle_X_sprintf(FT, NewArgs);
 544
 545   fputs(Buffer, (FILE *) GVTOP(Args[0]));
 546   return GV;
 547 }
 548
 549 } // End extern "C"
 550
 551 // Done with externals; turn the warning back on
 552 #ifdef _MSC_VER
 553     #pragma warning(default: 4190)
 554 #endif
 555
 556
 557 void Interpreter::initializeExternalFunctions() {
 558   sys::ScopedLock Writer(*FunctionsLock);
 559   FuncNames["lle_X_atexit"]       = lle_X_atexit;
 560   FuncNames["lle_X_exit"]         = lle_X_exit;
 561   FuncNames["lle_X_abort"]        = lle_X_abort;
 562
 563   FuncNames["lle_X_printf"]       = lle_X_printf;
 564   FuncNames["lle_X_sprintf"]      = lle_X_sprintf;
 565   FuncNames["lle_X_sscanf"]       = lle_X_sscanf;
 566   FuncNames["lle_X_scanf"]        = lle_X_scanf;
 567   FuncNames["lle_X_fprintf"]      = lle_X_fprintf;
 568 }
 569