1 //===- FileCheck.cpp - Check that File's Contents match what is expected --===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
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.
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.
17 //===----------------------------------------------------------------------===//
19 #include "llvm/ADT/OwningPtr.h"
20 #include "llvm/ADT/SmallString.h"
21 #include "llvm/ADT/StringExtras.h"
22 #include "llvm/ADT/StringMap.h"
23 #include "llvm/Support/CommandLine.h"
24 #include "llvm/Support/MemoryBuffer.h"
25 #include "llvm/Support/PrettyStackTrace.h"
26 #include "llvm/Support/Regex.h"
27 #include "llvm/Support/Signals.h"
28 #include "llvm/Support/SourceMgr.h"
29 #include "llvm/Support/raw_ostream.h"
30 #include "llvm/Support/system_error.h"
37 static cl::opt<std::string>
38 CheckFilename(cl::Positional, cl::desc("<check-file>"), cl::Required);
40 static cl::opt<std::string>
41 InputFilename("input-file", cl::desc("File to check (defaults to stdin)"),
42 cl::init("-"), cl::value_desc("filename"));
44 static cl::opt<std::string>
45 CheckPrefix("check-prefix", cl::init("CHECK"),
46 cl::desc("Prefix to use from check file (defaults to 'CHECK')"));
49 NoCanonicalizeWhiteSpace("strict-whitespace",
50 cl::desc("Do not treat all horizontal whitespace as equivalent"));
52 //===----------------------------------------------------------------------===//
53 // Pattern Handling Code.
54 //===----------------------------------------------------------------------===//
59 /// MatchEOF - When set, this pattern only matches the end of file. This is
60 /// used for trailing CHECK-NOTs.
69 /// FixedStr - If non-empty, this pattern is a fixed string match with the
70 /// specified fixed string.
73 /// RegEx - If non-empty, this is a regex pattern.
76 /// \brief Contains the number of line this pattern is in.
79 /// VariableUses - Entries in this vector map to uses of a variable in the
80 /// pattern, e.g. "foo[[bar]]baz". In this case, the RegExStr will contain
81 /// "foobaz" and we'll get an entry in this vector that tells us to insert the
82 /// value of bar at offset 3.
83 std::vector<std::pair<StringRef, unsigned> > VariableUses;
85 /// VariableDefs - Maps definitions of variables to their parenthesized
87 /// E.g. for the pattern "foo[[bar:.*]]baz", VariableDefs will map "bar" to 1.
88 std::map<StringRef, unsigned> VariableDefs;
92 Pattern(bool matchEOF = false)
93 : MatchEOF(matchEOF), MatchNot(false), MatchDag(false) { }
95 /// getLoc - Return the location in source code.
96 SMLoc getLoc() const { return PatternLoc; }
98 /// ParsePattern - Parse the given string into the Pattern. SM provides the
99 /// SourceMgr used for error reports, and LineNumber is the line number in
100 /// the input file from which the pattern string was read.
101 /// Returns true in case of an error, false otherwise.
102 bool ParsePattern(StringRef PatternStr, SourceMgr &SM, unsigned LineNumber);
104 /// Match - Match the pattern string against the input buffer Buffer. This
105 /// returns the position that is matched or npos if there is no match. If
106 /// there is a match, the size of the matched string is returned in MatchLen.
108 /// The VariableTable StringMap provides the current values of filecheck
109 /// variables and is updated if this match defines new values.
110 size_t Match(StringRef Buffer, size_t &MatchLen,
111 StringMap<StringRef> &VariableTable) const;
113 /// PrintFailureInfo - Print additional information about a failure to match
114 /// involving this pattern.
115 void PrintFailureInfo(const SourceMgr &SM, StringRef Buffer,
116 const StringMap<StringRef> &VariableTable) const;
118 bool hasVariable() const { return !(VariableUses.empty() &&
119 VariableDefs.empty()); }
121 void setMatchNot(bool Not) { MatchNot = Not; }
122 bool getMatchNot() const { return MatchNot; }
124 void setMatchDag(bool Dag) { MatchDag = Dag; }
125 bool getMatchDag() const { return MatchDag; }
128 static void AddFixedStringToRegEx(StringRef FixedStr, std::string &TheStr);
129 bool AddRegExToRegEx(StringRef RS, unsigned &CurParen, SourceMgr &SM);
130 void AddBackrefToRegEx(unsigned BackrefNum);
132 /// ComputeMatchDistance - Compute an arbitrary estimate for the quality of
133 /// matching this pattern at the start of \arg Buffer; a distance of zero
134 /// should correspond to a perfect match.
135 unsigned ComputeMatchDistance(StringRef Buffer,
136 const StringMap<StringRef> &VariableTable) const;
138 /// \brief Evaluates expression and stores the result to \p Value.
139 /// \return true on success. false when the expression has invalid syntax.
140 bool EvaluateExpression(StringRef Expr, std::string &Value) const;
142 /// \brief Finds the closing sequence of a regex variable usage or
143 /// definition. Str has to point in the beginning of the definition
144 /// (right after the opening sequence).
145 /// \return offset of the closing sequence within Str, or npos if it was not
147 size_t FindRegexVarEnd(StringRef Str);
151 bool Pattern::ParsePattern(StringRef PatternStr, SourceMgr &SM,
152 unsigned LineNumber) {
153 this->LineNumber = LineNumber;
154 PatternLoc = SMLoc::getFromPointer(PatternStr.data());
156 // Ignore trailing whitespace.
157 while (!PatternStr.empty() &&
158 (PatternStr.back() == ' ' || PatternStr.back() == '\t'))
159 PatternStr = PatternStr.substr(0, PatternStr.size()-1);
161 // Check that there is something on the line.
162 if (PatternStr.empty()) {
163 SM.PrintMessage(PatternLoc, SourceMgr::DK_Error,
164 "found empty check string with prefix '" +
169 // Check to see if this is a fixed string, or if it has regex pieces.
170 if (PatternStr.size() < 2 ||
171 (PatternStr.find("{{") == StringRef::npos &&
172 PatternStr.find("[[") == StringRef::npos)) {
173 FixedStr = PatternStr;
177 // Paren value #0 is for the fully matched string. Any new parenthesized
178 // values add from there.
179 unsigned CurParen = 1;
181 // Otherwise, there is at least one regex piece. Build up the regex pattern
182 // by escaping scary characters in fixed strings, building up one big regex.
183 while (!PatternStr.empty()) {
185 if (PatternStr.startswith("{{")) {
186 // This is the start of a regex match. Scan for the }}.
187 size_t End = PatternStr.find("}}");
188 if (End == StringRef::npos) {
189 SM.PrintMessage(SMLoc::getFromPointer(PatternStr.data()),
191 "found start of regex string with no end '}}'");
195 // Enclose {{}} patterns in parens just like [[]] even though we're not
196 // capturing the result for any purpose. This is required in case the
197 // expression contains an alternation like: CHECK: abc{{x|z}}def. We
198 // want this to turn into: "abc(x|z)def" not "abcx|zdef".
202 if (AddRegExToRegEx(PatternStr.substr(2, End-2), CurParen, SM))
206 PatternStr = PatternStr.substr(End+2);
210 // Named RegEx matches. These are of two forms: [[foo:.*]] which matches .*
211 // (or some other regex) and assigns it to the FileCheck variable 'foo'. The
212 // second form is [[foo]] which is a reference to foo. The variable name
213 // itself must be of the form "[a-zA-Z_][0-9a-zA-Z_]*", otherwise we reject
214 // it. This is to catch some common errors.
215 if (PatternStr.startswith("[[")) {
216 // Find the closing bracket pair ending the match. End is going to be an
217 // offset relative to the beginning of the match string.
218 size_t End = FindRegexVarEnd(PatternStr.substr(2));
220 if (End == StringRef::npos) {
221 SM.PrintMessage(SMLoc::getFromPointer(PatternStr.data()),
223 "invalid named regex reference, no ]] found");
227 StringRef MatchStr = PatternStr.substr(2, End);
228 PatternStr = PatternStr.substr(End+4);
230 // Get the regex name (e.g. "foo").
231 size_t NameEnd = MatchStr.find(':');
232 StringRef Name = MatchStr.substr(0, NameEnd);
235 SM.PrintMessage(SMLoc::getFromPointer(Name.data()), SourceMgr::DK_Error,
236 "invalid name in named regex: empty name");
240 // Verify that the name/expression is well formed. FileCheck currently
241 // supports @LINE, @LINE+number, @LINE-number expressions. The check here
242 // is relaxed, more strict check is performed in \c EvaluateExpression.
243 bool IsExpression = false;
244 for (unsigned i = 0, e = Name.size(); i != e; ++i) {
245 if (i == 0 && Name[i] == '@') {
246 if (NameEnd != StringRef::npos) {
247 SM.PrintMessage(SMLoc::getFromPointer(Name.data()),
249 "invalid name in named regex definition");
255 if (Name[i] != '_' && !isalnum(Name[i]) &&
256 (!IsExpression || (Name[i] != '+' && Name[i] != '-'))) {
257 SM.PrintMessage(SMLoc::getFromPointer(Name.data()+i),
258 SourceMgr::DK_Error, "invalid name in named regex");
263 // Name can't start with a digit.
264 if (isdigit(static_cast<unsigned char>(Name[0]))) {
265 SM.PrintMessage(SMLoc::getFromPointer(Name.data()), SourceMgr::DK_Error,
266 "invalid name in named regex");
271 if (NameEnd == StringRef::npos) {
272 // Handle variables that were defined earlier on the same line by
273 // emitting a backreference.
274 if (VariableDefs.find(Name) != VariableDefs.end()) {
275 unsigned VarParenNum = VariableDefs[Name];
276 if (VarParenNum < 1 || VarParenNum > 9) {
277 SM.PrintMessage(SMLoc::getFromPointer(Name.data()),
279 "Can't back-reference more than 9 variables");
282 AddBackrefToRegEx(VarParenNum);
284 VariableUses.push_back(std::make_pair(Name, RegExStr.size()));
289 // Handle [[foo:.*]].
290 VariableDefs[Name] = CurParen;
294 if (AddRegExToRegEx(MatchStr.substr(NameEnd+1), CurParen, SM))
300 // Handle fixed string matches.
301 // Find the end, which is the start of the next regex.
302 size_t FixedMatchEnd = PatternStr.find("{{");
303 FixedMatchEnd = std::min(FixedMatchEnd, PatternStr.find("[["));
304 AddFixedStringToRegEx(PatternStr.substr(0, FixedMatchEnd), RegExStr);
305 PatternStr = PatternStr.substr(FixedMatchEnd);
311 void Pattern::AddFixedStringToRegEx(StringRef FixedStr, std::string &TheStr) {
312 // Add the characters from FixedStr to the regex, escaping as needed. This
313 // avoids "leaning toothpicks" in common patterns.
314 for (unsigned i = 0, e = FixedStr.size(); i != e; ++i) {
315 switch (FixedStr[i]) {
316 // These are the special characters matched in "p_ere_exp".
332 TheStr += FixedStr[i];
338 bool Pattern::AddRegExToRegEx(StringRef RS, unsigned &CurParen,
342 if (!R.isValid(Error)) {
343 SM.PrintMessage(SMLoc::getFromPointer(RS.data()), SourceMgr::DK_Error,
344 "invalid regex: " + Error);
348 RegExStr += RS.str();
349 CurParen += R.getNumMatches();
353 void Pattern::AddBackrefToRegEx(unsigned BackrefNum) {
354 assert(BackrefNum >= 1 && BackrefNum <= 9 && "Invalid backref number");
355 std::string Backref = std::string("\\") +
356 std::string(1, '0' + BackrefNum);
360 bool Pattern::EvaluateExpression(StringRef Expr, std::string &Value) const {
361 // The only supported expression is @LINE([\+-]\d+)?
362 if (!Expr.startswith("@LINE"))
364 Expr = Expr.substr(StringRef("@LINE").size());
368 Expr = Expr.substr(1);
369 else if (Expr[0] != '-')
371 if (Expr.getAsInteger(10, Offset))
374 Value = llvm::itostr(LineNumber + Offset);
378 /// Match - Match the pattern string against the input buffer Buffer. This
379 /// returns the position that is matched or npos if there is no match. If
380 /// there is a match, the size of the matched string is returned in MatchLen.
381 size_t Pattern::Match(StringRef Buffer, size_t &MatchLen,
382 StringMap<StringRef> &VariableTable) const {
383 // If this is the EOF pattern, match it immediately.
386 return Buffer.size();
389 // If this is a fixed string pattern, just match it now.
390 if (!FixedStr.empty()) {
391 MatchLen = FixedStr.size();
392 return Buffer.find(FixedStr);
397 // If there are variable uses, we need to create a temporary string with the
399 StringRef RegExToMatch = RegExStr;
401 if (!VariableUses.empty()) {
404 unsigned InsertOffset = 0;
405 for (unsigned i = 0, e = VariableUses.size(); i != e; ++i) {
408 if (VariableUses[i].first[0] == '@') {
409 if (!EvaluateExpression(VariableUses[i].first, Value))
410 return StringRef::npos;
412 StringMap<StringRef>::iterator it =
413 VariableTable.find(VariableUses[i].first);
414 // If the variable is undefined, return an error.
415 if (it == VariableTable.end())
416 return StringRef::npos;
418 // Look up the value and escape it so that we can plop it into the regex.
419 AddFixedStringToRegEx(it->second, Value);
422 // Plop it into the regex at the adjusted offset.
423 TmpStr.insert(TmpStr.begin()+VariableUses[i].second+InsertOffset,
424 Value.begin(), Value.end());
425 InsertOffset += Value.size();
428 // Match the newly constructed regex.
429 RegExToMatch = TmpStr;
433 SmallVector<StringRef, 4> MatchInfo;
434 if (!Regex(RegExToMatch, Regex::Newline).match(Buffer, &MatchInfo))
435 return StringRef::npos;
437 // Successful regex match.
438 assert(!MatchInfo.empty() && "Didn't get any match");
439 StringRef FullMatch = MatchInfo[0];
441 // If this defines any variables, remember their values.
442 for (std::map<StringRef, unsigned>::const_iterator I = VariableDefs.begin(),
443 E = VariableDefs.end();
445 assert(I->second < MatchInfo.size() && "Internal paren error");
446 VariableTable[I->first] = MatchInfo[I->second];
449 MatchLen = FullMatch.size();
450 return FullMatch.data()-Buffer.data();
453 unsigned Pattern::ComputeMatchDistance(StringRef Buffer,
454 const StringMap<StringRef> &VariableTable) const {
455 // Just compute the number of matching characters. For regular expressions, we
456 // just compare against the regex itself and hope for the best.
458 // FIXME: One easy improvement here is have the regex lib generate a single
459 // example regular expression which matches, and use that as the example
461 StringRef ExampleString(FixedStr);
462 if (ExampleString.empty())
463 ExampleString = RegExStr;
465 // Only compare up to the first line in the buffer, or the string size.
466 StringRef BufferPrefix = Buffer.substr(0, ExampleString.size());
467 BufferPrefix = BufferPrefix.split('\n').first;
468 return BufferPrefix.edit_distance(ExampleString);
471 void Pattern::PrintFailureInfo(const SourceMgr &SM, StringRef Buffer,
472 const StringMap<StringRef> &VariableTable) const{
473 // If this was a regular expression using variables, print the current
475 if (!VariableUses.empty()) {
476 for (unsigned i = 0, e = VariableUses.size(); i != e; ++i) {
477 SmallString<256> Msg;
478 raw_svector_ostream OS(Msg);
479 StringRef Var = VariableUses[i].first;
482 if (EvaluateExpression(Var, Value)) {
483 OS << "with expression \"";
484 OS.write_escaped(Var) << "\" equal to \"";
485 OS.write_escaped(Value) << "\"";
487 OS << "uses incorrect expression \"";
488 OS.write_escaped(Var) << "\"";
491 StringMap<StringRef>::const_iterator it = VariableTable.find(Var);
493 // Check for undefined variable references.
494 if (it == VariableTable.end()) {
495 OS << "uses undefined variable \"";
496 OS.write_escaped(Var) << "\"";
498 OS << "with variable \"";
499 OS.write_escaped(Var) << "\" equal to \"";
500 OS.write_escaped(it->second) << "\"";
504 SM.PrintMessage(SMLoc::getFromPointer(Buffer.data()), SourceMgr::DK_Note,
509 // Attempt to find the closest/best fuzzy match. Usually an error happens
510 // because some string in the output didn't exactly match. In these cases, we
511 // would like to show the user a best guess at what "should have" matched, to
512 // save them having to actually check the input manually.
513 size_t NumLinesForward = 0;
514 size_t Best = StringRef::npos;
515 double BestQuality = 0;
517 // Use an arbitrary 4k limit on how far we will search.
518 for (size_t i = 0, e = std::min(size_t(4096), Buffer.size()); i != e; ++i) {
519 if (Buffer[i] == '\n')
522 // Patterns have leading whitespace stripped, so skip whitespace when
523 // looking for something which looks like a pattern.
524 if (Buffer[i] == ' ' || Buffer[i] == '\t')
527 // Compute the "quality" of this match as an arbitrary combination of the
528 // match distance and the number of lines skipped to get to this match.
529 unsigned Distance = ComputeMatchDistance(Buffer.substr(i), VariableTable);
530 double Quality = Distance + (NumLinesForward / 100.);
532 if (Quality < BestQuality || Best == StringRef::npos) {
534 BestQuality = Quality;
538 // Print the "possible intended match here" line if we found something
539 // reasonable and not equal to what we showed in the "scanning from here"
541 if (Best && Best != StringRef::npos && BestQuality < 50) {
542 SM.PrintMessage(SMLoc::getFromPointer(Buffer.data() + Best),
543 SourceMgr::DK_Note, "possible intended match here");
545 // FIXME: If we wanted to be really friendly we would show why the match
546 // failed, as it can be hard to spot simple one character differences.
550 size_t Pattern::FindRegexVarEnd(StringRef Str) {
551 // Offset keeps track of the current offset within the input Str
553 // [...] Nesting depth
554 size_t BracketDepth = 0;
556 while (!Str.empty()) {
557 if (Str.startswith("]]") && BracketDepth == 0)
559 if (Str[0] == '\\') {
560 // Backslash escapes the next char within regexes, so skip them both.
571 assert(BracketDepth > 0 && "Invalid regex");
580 return StringRef::npos;
584 //===----------------------------------------------------------------------===//
586 //===----------------------------------------------------------------------===//
588 /// CheckString - This is a check that we found in the input file.
590 /// Pat - The pattern to match.
593 /// Loc - The location in the match file that the check string was specified.
596 /// IsCheckNext - This is true if this is a CHECK-NEXT: directive (as opposed
597 /// to a CHECK: directive.
600 /// IsCheckLabel - This is true if this is a CHECK-LABEL: directive (as
601 /// opposed to a CHECK: directive.
604 /// DagNotStrings - These are all of the strings that are disallowed from
605 /// occurring between this match string and the previous one (or start of
607 std::vector<Pattern> DagNotStrings;
609 CheckString(const Pattern &P, SMLoc L, bool isCheckNext, bool isCheckLabel)
610 : Pat(P), Loc(L), IsCheckNext(isCheckNext), IsCheckLabel(isCheckLabel) {}
612 /// Check - Match check string and its "not strings" and/or "dag strings".
613 size_t Check(const SourceMgr &SM, StringRef Buffer, bool IsLabel,
614 size_t &MatchLen, StringMap<StringRef> &VariableTable) const;
616 /// CheckNext - Verify there is a single line in the given buffer.
617 bool CheckNext(const SourceMgr &SM, StringRef Buffer) const;
619 /// CheckNot - Verify there's no "not strings" in the given buffer.
620 bool CheckNot(const SourceMgr &SM, StringRef Buffer,
621 const std::vector<const Pattern *> &NotStrings,
622 StringMap<StringRef> &VariableTable) const;
624 /// CheckDag - Match "dag strings" and their mixed "not strings".
625 size_t CheckDag(const SourceMgr &SM, StringRef Buffer,
626 std::vector<const Pattern *> &NotStrings,
627 StringMap<StringRef> &VariableTable) const;
630 /// Canonicalize whitespaces in the input file. Line endings are replaced
631 /// with UNIX-style '\n'.
633 /// \param PreserveHorizontal Don't squash consecutive horizontal whitespace
634 /// characters to a single space.
635 static MemoryBuffer *CanonicalizeInputFile(MemoryBuffer *MB,
636 bool PreserveHorizontal) {
637 SmallString<128> NewFile;
638 NewFile.reserve(MB->getBufferSize());
640 for (const char *Ptr = MB->getBufferStart(), *End = MB->getBufferEnd();
642 // Eliminate trailing dosish \r.
643 if (Ptr <= End - 2 && Ptr[0] == '\r' && Ptr[1] == '\n') {
647 // If current char is not a horizontal whitespace or if horizontal
648 // whitespace canonicalization is disabled, dump it to output as is.
649 if (PreserveHorizontal || (*Ptr != ' ' && *Ptr != '\t')) {
650 NewFile.push_back(*Ptr);
654 // Otherwise, add one space and advance over neighboring space.
655 NewFile.push_back(' ');
656 while (Ptr+1 != End &&
657 (Ptr[1] == ' ' || Ptr[1] == '\t'))
661 // Free the old buffer and return a new one.
663 MemoryBuffer::getMemBufferCopy(NewFile.str(), MB->getBufferIdentifier());
670 /// ReadCheckFile - Read the check file, which specifies the sequence of
671 /// expected strings. The strings are added to the CheckStrings vector.
672 /// Returns true in case of an error, false otherwise.
673 static bool ReadCheckFile(SourceMgr &SM,
674 std::vector<CheckString> &CheckStrings) {
675 OwningPtr<MemoryBuffer> File;
677 MemoryBuffer::getFileOrSTDIN(CheckFilename, File)) {
678 errs() << "Could not open check file '" << CheckFilename << "': "
679 << ec.message() << '\n';
683 // If we want to canonicalize whitespace, strip excess whitespace from the
684 // buffer containing the CHECK lines. Remove DOS style line endings.
686 CanonicalizeInputFile(File.take(), NoCanonicalizeWhiteSpace);
688 SM.AddNewSourceBuffer(F, SMLoc());
690 // Find all instances of CheckPrefix followed by : in the file.
691 StringRef Buffer = F->getBuffer();
692 std::vector<Pattern> DagNotMatches;
694 // LineNumber keeps track of the line on which CheckPrefix instances are
696 unsigned LineNumber = 1;
699 // See if Prefix occurs in the memory buffer.
700 size_t PrefixLoc = Buffer.find(CheckPrefix);
701 // If we didn't find a match, we're done.
702 if (PrefixLoc == StringRef::npos)
705 LineNumber += Buffer.substr(0, PrefixLoc).count('\n');
707 // Keep the charcter before our prefix so we can validate that we have
708 // found our prefix, and account for cases when PrefixLoc is 0.
709 Buffer = Buffer.substr(std::min(PrefixLoc-1, PrefixLoc));
711 const char *CheckPrefixStart = Buffer.data() + (PrefixLoc == 0 ? 0 : 1);
713 // When we find a check prefix, keep track of whether we find CHECK: or
715 bool IsCheckNext = false, IsCheckNot = false, IsCheckDag = false,
716 IsCheckLabel = false;
718 // Make sure we have actually found our prefix, and not a word containing
720 if (PrefixLoc != 0 && (isalnum(Buffer[0]) ||
723 Buffer = Buffer.substr(CheckPrefix.size());
727 // Verify that the : is present after the prefix.
728 if (Buffer[CheckPrefix.size()] == ':') {
729 Buffer = Buffer.substr(CheckPrefix.size()+1);
730 } else if (Buffer.size() > CheckPrefix.size()+6 &&
731 memcmp(Buffer.data()+CheckPrefix.size(), "-NEXT:", 6) == 0) {
732 Buffer = Buffer.substr(CheckPrefix.size()+6);
734 } else if (Buffer.size() > CheckPrefix.size()+5 &&
735 memcmp(Buffer.data()+CheckPrefix.size(), "-NOT:", 5) == 0) {
736 Buffer = Buffer.substr(CheckPrefix.size()+5);
738 } else if (Buffer.size() > CheckPrefix.size()+5 &&
739 memcmp(Buffer.data()+CheckPrefix.size(), "-DAG:", 5) == 0) {
740 Buffer = Buffer.substr(CheckPrefix.size()+5);
742 } else if (Buffer.size() > CheckPrefix.size()+7 &&
743 memcmp(Buffer.data()+CheckPrefix.size(), "-LABEL:", 7) == 0) {
744 Buffer = Buffer.substr(CheckPrefix.size()+7);
747 Buffer = Buffer.substr(1);
751 // Okay, we found the prefix, yay. Remember the rest of the line, but
752 // ignore leading and trailing whitespace.
753 Buffer = Buffer.substr(Buffer.find_first_not_of(" \t"));
755 // Scan ahead to the end of line.
756 size_t EOL = Buffer.find_first_of("\n\r");
758 // Remember the location of the start of the pattern, for diagnostics.
759 SMLoc PatternLoc = SMLoc::getFromPointer(Buffer.data());
761 // Parse the pattern.
763 if (P.ParsePattern(Buffer.substr(0, EOL), SM, LineNumber))
766 // Verify that CHECK-LABEL lines do not define or use variables
767 if (IsCheckLabel && P.hasVariable()) {
768 SM.PrintMessage(SMLoc::getFromPointer(CheckPrefixStart),
770 "found '"+CheckPrefix+"-LABEL:' with variable definition"
775 P.setMatchNot(IsCheckNot);
776 P.setMatchDag(IsCheckDag);
778 Buffer = Buffer.substr(EOL);
780 // Verify that CHECK-NEXT lines have at least one CHECK line before them.
781 if (IsCheckNext && CheckStrings.empty()) {
782 SM.PrintMessage(SMLoc::getFromPointer(CheckPrefixStart),
784 "found '"+CheckPrefix+"-NEXT:' without previous '"+
785 CheckPrefix+ ": line");
789 // Handle CHECK-DAG/-NOT.
790 if (IsCheckDag || IsCheckNot) {
791 DagNotMatches.push_back(P);
795 // Okay, add the string we captured to the output vector and move on.
796 CheckStrings.push_back(CheckString(P,
800 std::swap(DagNotMatches, CheckStrings.back().DagNotStrings);
803 // Add an EOF pattern for any trailing CHECK-DAG/-NOTs.
804 if (!DagNotMatches.empty()) {
805 CheckStrings.push_back(CheckString(Pattern(true),
806 SMLoc::getFromPointer(Buffer.data()),
809 std::swap(DagNotMatches, CheckStrings.back().DagNotStrings);
812 if (CheckStrings.empty()) {
813 errs() << "error: no check strings found with prefix '" << CheckPrefix
821 static void PrintCheckFailed(const SourceMgr &SM, const SMLoc &Loc,
822 const Pattern &Pat, StringRef Buffer,
823 StringMap<StringRef> &VariableTable) {
824 // Otherwise, we have an error, emit an error message.
825 SM.PrintMessage(Loc, SourceMgr::DK_Error,
826 "expected string not found in input");
828 // Print the "scanning from here" line. If the current position is at the
829 // end of a line, advance to the start of the next line.
830 Buffer = Buffer.substr(Buffer.find_first_not_of(" \t\n\r"));
832 SM.PrintMessage(SMLoc::getFromPointer(Buffer.data()), SourceMgr::DK_Note,
833 "scanning from here");
835 // Allow the pattern to print additional information if desired.
836 Pat.PrintFailureInfo(SM, Buffer, VariableTable);
839 static void PrintCheckFailed(const SourceMgr &SM, const CheckString &CheckStr,
841 StringMap<StringRef> &VariableTable) {
842 PrintCheckFailed(SM, CheckStr.Loc, CheckStr.Pat, Buffer, VariableTable);
845 /// CountNumNewlinesBetween - Count the number of newlines in the specified
847 static unsigned CountNumNewlinesBetween(StringRef Range) {
848 unsigned NumNewLines = 0;
851 Range = Range.substr(Range.find_first_of("\n\r"));
852 if (Range.empty()) return NumNewLines;
856 // Handle \n\r and \r\n as a single newline.
857 if (Range.size() > 1 &&
858 (Range[1] == '\n' || Range[1] == '\r') &&
859 (Range[0] != Range[1]))
860 Range = Range.substr(1);
861 Range = Range.substr(1);
865 size_t CheckString::Check(const SourceMgr &SM, StringRef Buffer,
866 bool IsLabel, size_t &MatchLen,
867 StringMap<StringRef> &VariableTable) const {
869 std::vector<const Pattern *> NotStrings;
872 // Match "dag strings" (with mixed "not strings" if any).
873 LastPos = CheckDag(SM, Buffer, NotStrings, VariableTable);
874 if (LastPos == StringRef::npos)
875 return StringRef::npos;
878 // Match itself from the last position after matching CHECK-DAG.
879 StringRef MatchBuffer = Buffer.substr(LastPos);
880 size_t MatchPos = Pat.Match(MatchBuffer, MatchLen, VariableTable);
881 if (MatchPos == StringRef::npos) {
882 PrintCheckFailed(SM, *this, MatchBuffer, VariableTable);
883 return StringRef::npos;
888 StringRef SkippedRegion = Buffer.substr(LastPos, MatchPos);
890 // If this check is a "CHECK-NEXT", verify that the previous match was on
891 // the previous line (i.e. that there is one newline between them).
892 if (CheckNext(SM, SkippedRegion))
893 return StringRef::npos;
895 // If this match had "not strings", verify that they don't exist in the
897 if (CheckNot(SM, SkippedRegion, NotStrings, VariableTable))
898 return StringRef::npos;
904 bool CheckString::CheckNext(const SourceMgr &SM, StringRef Buffer) const {
908 // Count the number of newlines between the previous match and this one.
909 assert(Buffer.data() !=
911 SM.FindBufferContainingLoc(
912 SMLoc::getFromPointer(Buffer.data())))->getBufferStart() &&
913 "CHECK-NEXT can't be the first check in a file");
915 unsigned NumNewLines = CountNumNewlinesBetween(Buffer);
917 if (NumNewLines == 0) {
918 SM.PrintMessage(Loc, SourceMgr::DK_Error, CheckPrefix+
919 "-NEXT: is on the same line as previous match");
920 SM.PrintMessage(SMLoc::getFromPointer(Buffer.end()),
921 SourceMgr::DK_Note, "'next' match was here");
922 SM.PrintMessage(SMLoc::getFromPointer(Buffer.data()), SourceMgr::DK_Note,
923 "previous match ended here");
927 if (NumNewLines != 1) {
928 SM.PrintMessage(Loc, SourceMgr::DK_Error, CheckPrefix+
929 "-NEXT: is not on the line after the previous match");
930 SM.PrintMessage(SMLoc::getFromPointer(Buffer.end()),
931 SourceMgr::DK_Note, "'next' match was here");
932 SM.PrintMessage(SMLoc::getFromPointer(Buffer.data()), SourceMgr::DK_Note,
933 "previous match ended here");
940 bool CheckString::CheckNot(const SourceMgr &SM, StringRef Buffer,
941 const std::vector<const Pattern *> &NotStrings,
942 StringMap<StringRef> &VariableTable) const {
943 for (unsigned ChunkNo = 0, e = NotStrings.size();
944 ChunkNo != e; ++ChunkNo) {
945 const Pattern *Pat = NotStrings[ChunkNo];
946 assert(Pat->getMatchNot() && "Expect CHECK-NOT!");
949 size_t Pos = Pat->Match(Buffer, MatchLen, VariableTable);
951 if (Pos == StringRef::npos) continue;
953 SM.PrintMessage(SMLoc::getFromPointer(Buffer.data()+Pos),
955 CheckPrefix+"-NOT: string occurred!");
956 SM.PrintMessage(Pat->getLoc(), SourceMgr::DK_Note,
957 CheckPrefix+"-NOT: pattern specified here");
964 size_t CheckString::CheckDag(const SourceMgr &SM, StringRef Buffer,
965 std::vector<const Pattern *> &NotStrings,
966 StringMap<StringRef> &VariableTable) const {
967 if (DagNotStrings.empty())
971 size_t StartPos = LastPos;
973 for (unsigned ChunkNo = 0, e = DagNotStrings.size();
974 ChunkNo != e; ++ChunkNo) {
975 const Pattern &Pat = DagNotStrings[ChunkNo];
977 assert((Pat.getMatchDag() ^ Pat.getMatchNot()) &&
978 "Invalid CHECK-DAG or CHECK-NOT!");
980 if (Pat.getMatchNot()) {
981 NotStrings.push_back(&Pat);
985 assert(Pat.getMatchDag() && "Expect CHECK-DAG!");
987 size_t MatchLen = 0, MatchPos;
989 // CHECK-DAG always matches from the start.
990 StringRef MatchBuffer = Buffer.substr(StartPos);
991 MatchPos = Pat.Match(MatchBuffer, MatchLen, VariableTable);
992 // With a group of CHECK-DAGs, a single mismatching means the match on
993 // that group of CHECK-DAGs fails immediately.
994 if (MatchPos == StringRef::npos) {
995 PrintCheckFailed(SM, Pat.getLoc(), Pat, MatchBuffer, VariableTable);
996 return StringRef::npos;
998 // Re-calc it as the offset relative to the start of the original string.
999 MatchPos += StartPos;
1001 if (!NotStrings.empty()) {
1002 if (MatchPos < LastPos) {
1004 SM.PrintMessage(SMLoc::getFromPointer(Buffer.data() + MatchPos),
1005 SourceMgr::DK_Error,
1006 CheckPrefix+"-DAG: found a match of CHECK-DAG"
1007 " reordering across a CHECK-NOT");
1008 SM.PrintMessage(SMLoc::getFromPointer(Buffer.data() + LastPos),
1010 CheckPrefix+"-DAG: the farthest match of CHECK-DAG"
1012 SM.PrintMessage(NotStrings[0]->getLoc(), SourceMgr::DK_Note,
1013 CheckPrefix+"-NOT: the crossed pattern specified"
1015 SM.PrintMessage(Pat.getLoc(), SourceMgr::DK_Note,
1016 CheckPrefix+"-DAG: the reordered pattern specified"
1018 return StringRef::npos;
1020 // All subsequent CHECK-DAGs should be matched from the farthest
1021 // position of all precedent CHECK-DAGs (including this one.)
1023 // If there's CHECK-NOTs between two CHECK-DAGs or from CHECK to
1024 // CHECK-DAG, verify that there's no 'not' strings occurred in that
1026 StringRef SkippedRegion = Buffer.substr(LastPos, MatchPos);
1027 if (CheckNot(SM, SkippedRegion, NotStrings, VariableTable))
1028 return StringRef::npos;
1029 // Clear "not strings".
1033 // Update the last position with CHECK-DAG matches.
1034 LastPos = std::max(MatchPos + MatchLen, LastPos);
1040 bool ValidateCheckPrefix() {
1041 // The check prefix must contain only alphanumeric, hyphens and underscores.
1042 Regex prefixValidator("^[a-zA-Z0-9_-]*$");
1043 return prefixValidator.match(CheckPrefix);
1046 int main(int argc, char **argv) {
1047 sys::PrintStackTraceOnErrorSignal();
1048 PrettyStackTraceProgram X(argc, argv);
1049 cl::ParseCommandLineOptions(argc, argv);
1051 if (!ValidateCheckPrefix()) {
1052 errs() << "Supplied check-prefix is invalid! Prefixes must start with a "
1053 "letter and contain only alphanumeric characters, hyphens and "
1060 // Read the expected strings from the check file.
1061 std::vector<CheckString> CheckStrings;
1062 if (ReadCheckFile(SM, CheckStrings))
1065 // Open the file to check and add it to SourceMgr.
1066 OwningPtr<MemoryBuffer> File;
1068 MemoryBuffer::getFileOrSTDIN(InputFilename, File)) {
1069 errs() << "Could not open input file '" << InputFilename << "': "
1070 << ec.message() << '\n';
1074 if (File->getBufferSize() == 0) {
1075 errs() << "FileCheck error: '" << InputFilename << "' is empty.\n";
1079 // Remove duplicate spaces in the input file if requested.
1080 // Remove DOS style line endings.
1082 CanonicalizeInputFile(File.take(), NoCanonicalizeWhiteSpace);
1084 SM.AddNewSourceBuffer(F, SMLoc());
1086 /// VariableTable - This holds all the current filecheck variables.
1087 StringMap<StringRef> VariableTable;
1089 // Check that we have all of the expected strings, in order, in the input
1091 StringRef Buffer = F->getBuffer();
1093 bool hasError = false;
1095 unsigned i = 0, j = 0, e = CheckStrings.size();
1098 StringRef CheckRegion;
1100 CheckRegion = Buffer;
1102 const CheckString &CheckLabelStr = CheckStrings[j];
1103 if (!CheckLabelStr.IsCheckLabel) {
1108 // Scan to next CHECK-LABEL match, ignoring CHECK-NOT and CHECK-DAG
1109 size_t MatchLabelLen = 0;
1110 size_t MatchLabelPos = CheckLabelStr.Check(SM, Buffer, true,
1111 MatchLabelLen, VariableTable);
1112 if (MatchLabelPos == StringRef::npos) {
1117 CheckRegion = Buffer.substr(0, MatchLabelPos + MatchLabelLen);
1118 Buffer = Buffer.substr(MatchLabelPos + MatchLabelLen);
1122 for ( ; i != j; ++i) {
1123 const CheckString &CheckStr = CheckStrings[i];
1125 // Check each string within the scanned region, including a second check
1126 // of any final CHECK-LABEL (to verify CHECK-NOT and CHECK-DAG)
1127 size_t MatchLen = 0;
1128 size_t MatchPos = CheckStr.Check(SM, CheckRegion, false, MatchLen,
1131 if (MatchPos == StringRef::npos) {
1137 CheckRegion = CheckRegion.substr(MatchPos + MatchLen);
1144 return hasError ? 1 : 0;