utils/FileCheck/FileCheck.cpp

   1 //===- FileCheck.cpp - Check that File's Contents match what is expected --===//
   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 // FileCheck does a line-by line check of a file that validates whether it
  11 // contains the expected content.  This is useful for regression tests etc.
  12 //
  13 // This program exits with an error status of 2 on error, exit status of 0 if
  14 // the file matched the expected contents, and exit status of 1 if it did not
  15 // contain the expected contents.
  16 //
  17 //===----------------------------------------------------------------------===//
  18
  19 #include "llvm/Support/CommandLine.h"
  20 #include "llvm/Support/MemoryBuffer.h"
  21 #include "llvm/Support/PrettyStackTrace.h"
  22 #include "llvm/Support/SourceMgr.h"
  23 #include "llvm/Support/raw_ostream.h"
  24 #include "llvm/System/Signals.h"
  25 using namespace llvm;
  26
  27 static cl::opt<std::string>
  28 CheckFilename(cl::Positional, cl::desc("<check-file>"), cl::Required);
  29
  30 static cl::opt<std::string>
  31 InputFilename("input-file", cl::desc("File to check (defaults to stdin)"),
  32               cl::init("-"), cl::value_desc("filename"));
  33
  34 static cl::opt<std::string>
  35 CheckPrefix("check-prefix", cl::init("CHECK"),
  36             cl::desc("Prefix to use from check file (defaults to 'CHECK')"));
  37
  38 static cl::opt<bool>
  39 NoCanonicalizeWhiteSpace("strict-whitespace",
  40               cl::desc("Do not treat all horizontal whitespace as equivalent"));
  41
  42
  43 /// FindStringInBuffer - This is basically just a strstr wrapper that differs in
  44 /// two ways: first it handles 'nul' characters in memory buffers, second, it
  45 /// returns the end of the memory buffer on match failure.
  46 static const char *FindStringInBuffer(const char *Str, const char *CurPtr,
  47                                       const MemoryBuffer &MB) {
  48   // Check to see if we have a match.  If so, just return it.
  49   if (const char *Res = strstr(CurPtr, Str))
  50     return Res;
  51
  52   // If not, check to make sure we didn't just find an embedded nul in the
  53   // memory buffer.
  54   const char *Ptr = CurPtr + strlen(CurPtr);
  55
  56   // If we really reached the end of the file, return it.
  57   if (Ptr == MB.getBufferEnd())
  58     return Ptr;
  59
  60   // Otherwise, just skip this section of the file, including the nul.
  61   return FindStringInBuffer(Str, Ptr+1, MB);
  62 }
  63
  64 /// ReadCheckFile - Read the check file, which specifies the sequence of
  65 /// expected strings.  The strings are added to the CheckStrings vector.
  66 static bool ReadCheckFile(SourceMgr &SM,
  67                           std::vector<std::pair<std::string, SMLoc> >
  68                                          &CheckStrings) {
  69   // Open the check file, and tell SourceMgr about it.
  70   std::string ErrorStr;
  71   MemoryBuffer *F =
  72     MemoryBuffer::getFileOrSTDIN(CheckFilename.c_str(), &ErrorStr);
  73   if (F == 0) {
  74     errs() << "Could not open check file '" << CheckFilename << "': "
  75            << ErrorStr << '\n';
  76     return true;
  77   }
  78   SM.AddNewSourceBuffer(F, SMLoc());
  79
  80   // Find all instances of CheckPrefix followed by : in the file.  The
  81   // MemoryBuffer is guaranteed to be nul terminated, but may have nul's
  82   // embedded into it.  We don't support check strings with embedded nuls.
  83   std::string Prefix = CheckPrefix + ":";
  84   const char *CurPtr = F->getBufferStart(), *BufferEnd = F->getBufferEnd();
  85
  86   while (1) {
  87     // See if Prefix occurs in the memory buffer.
  88     const char *Ptr = FindStringInBuffer(Prefix.c_str(), CurPtr, *F);
  89
  90     // If we didn't find a match, we're done.
  91     if (Ptr == BufferEnd)
  92       break;
  93
  94     // Okay, we found the prefix, yay.  Remember the rest of the line, but
  95     // ignore leading and trailing whitespace.
  96     Ptr += Prefix.size();
  97     while (*Ptr == ' ' || *Ptr == '\t')
  98       ++Ptr;
  99
 100     // Scan ahead to the end of line.
 101     CurPtr = Ptr;
 102     while (CurPtr != BufferEnd && *CurPtr != '\n' && *CurPtr != '\r')
 103       ++CurPtr;
 104
 105     // Ignore trailing whitespace.
 106     while (CurPtr[-1] == ' ' || CurPtr[-1] == '\t')
 107       --CurPtr;
 108
 109     // Check that there is something on the line.
 110     if (Ptr >= CurPtr) {
 111       SM.PrintMessage(SMLoc::getFromPointer(CurPtr),
 112                       "found empty check string with prefix '"+Prefix+"'",
 113                       "error");
 114       return true;
 115     }
 116
 117     // Okay, add the string we captured to the output vector and move on.
 118     CheckStrings.push_back(std::make_pair(std::string(Ptr, CurPtr),
 119                                           SMLoc::getFromPointer(Ptr)));
 120   }
 121
 122   if (CheckStrings.empty()) {
 123     errs() << "error: no check strings found with prefix '" << Prefix << "'\n";
 124     return true;
 125   }
 126
 127   return false;
 128 }
 129
 130 // CanonicalizeCheckStrings - Replace all sequences of horizontal whitespace in
 131 // the check strings with a single space.
 132 static void CanonicalizeCheckStrings(std::vector<std::pair<std::string, SMLoc> >
 133                                      &CheckStrings) {
 134   for (unsigned i = 0, e = CheckStrings.size(); i != e; ++i) {
 135     std::string &Str = CheckStrings[i].first;
 136
 137     for (unsigned C = 0; C != Str.size(); ++C) {
 138       // If C is not a horizontal whitespace, skip it.
 139       if (Str[C] != ' ' && Str[C] != '\t')
 140         continue;
 141
 142       // Replace the character with space, then remove any other space
 143       // characters after it.
 144       Str[C] = ' ';
 145
 146       while (C+1 != Str.size() &&
 147              (Str[C+1] == ' ' || Str[C+1] == '\t'))
 148         Str.erase(Str.begin()+C+1);
 149     }
 150   }
 151 }
 152
 153 /// CanonicalizeInputFile - Remove duplicate horizontal space from the specified
 154 /// memory buffer, free it, and return a new one.
 155 static MemoryBuffer *CanonicalizeInputFile(MemoryBuffer *MB) {
 156   SmallVector<char, 16> NewFile;
 157   NewFile.reserve(MB->getBufferSize());
 158
 159   for (const char *Ptr = MB->getBufferStart(), *End = MB->getBufferEnd();
 160        Ptr != End; ++Ptr) {
 161     // If C is not a horizontal whitespace, skip it.
 162     if (*Ptr != ' ' && *Ptr != '\t') {
 163       NewFile.push_back(*Ptr);
 164       continue;
 165     }
 166
 167     // Otherwise, add one space and advance over neighboring space.
 168     NewFile.push_back(' ');
 169     while (Ptr+1 != End &&
 170            (Ptr[1] == ' ' || Ptr[1] == '\t'))
 171       ++Ptr;
 172   }
 173
 174   // Free the old buffer and return a new one.
 175   MemoryBuffer *MB2 =
 176     MemoryBuffer::getMemBufferCopy(NewFile.data(),
 177                                    NewFile.data() + NewFile.size(),
 178                                    MB->getBufferIdentifier());
 179
 180   delete MB;
 181   return MB2;
 182 }
 183
 184
 185 int main(int argc, char **argv) {
 186   sys::PrintStackTraceOnErrorSignal();
 187   PrettyStackTraceProgram X(argc, argv);
 188   cl::ParseCommandLineOptions(argc, argv);
 189
 190   SourceMgr SM;
 191
 192   // Read the expected strings from the check file.
 193   std::vector<std::pair<std::string, SMLoc> > CheckStrings;
 194   if (ReadCheckFile(SM, CheckStrings))
 195     return 2;
 196
 197   // Remove duplicate spaces in the check strings if requested.
 198   if (!NoCanonicalizeWhiteSpace)
 199     CanonicalizeCheckStrings(CheckStrings);
 200
 201   // Open the file to check and add it to SourceMgr.
 202   std::string ErrorStr;
 203   MemoryBuffer *F =
 204     MemoryBuffer::getFileOrSTDIN(InputFilename.c_str(), &ErrorStr);
 205   if (F == 0) {
 206     errs() << "Could not open input file '" << InputFilename << "': "
 207            << ErrorStr << '\n';
 208     return true;
 209   }
 210
 211   // Remove duplicate spaces in the input file if requested.
 212   if (!NoCanonicalizeWhiteSpace)
 213     F = CanonicalizeInputFile(F);
 214
 215   SM.AddNewSourceBuffer(F, SMLoc());
 216
 217   // Check that we have all of the expected strings, in order, in the input
 218   // file.
 219   const char *CurPtr = F->getBufferStart(), *BufferEnd = F->getBufferEnd();
 220
 221   for (unsigned StrNo = 0, e = CheckStrings.size(); StrNo != e; ++StrNo) {
 222     const std::pair<std::string, SMLoc> &CheckStr = CheckStrings[StrNo];
 223
 224     // Find StrNo in the file.
 225     const char *Ptr = FindStringInBuffer(CheckStr.first.c_str(), CurPtr, *F);
 226
 227     // If we found a match, we're done, move on.
 228     if (Ptr != BufferEnd) {
 229       CurPtr = Ptr + CheckStr.first.size();
 230       continue;
 231     }
 232
 233     // Otherwise, we have an error, emit an error message.
 234     SM.PrintMessage(CheckStr.second, "expected string not found in input",
 235                     "error");
 236
 237     // Print the "scanning from here" line.  If the current position is at the
 238     // end of a line, advance to the start of the next line.
 239     const char *Scan = CurPtr;
 240     while (Scan != BufferEnd &&
 241            (*Scan == ' ' || *Scan == '\t'))
 242       ++Scan;
 243     if (*Scan == '\n' || *Scan == '\r')
 244       CurPtr = Scan+1;
 245
 246
 247     SM.PrintMessage(SMLoc::getFromPointer(CurPtr), "scanning from here",
 248                     "note");
 249     return 1;
 250   }
 251
 252   return 0;
 253 }