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llvm/utils/FileCheck/FileCheck.cpp
Benjamin Kramer 2d07ebfe44 [FileCheck] Use range-based for loops. NFC. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@247272 91177308-0d34-0410-b5e6-96231b3b80d8
2015-09-10 11:59:55 +00:00

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//===- FileCheck.cpp - Check that File's Contents match what is expected --===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// FileCheck does a line-by line check of a file that validates whether it
// contains the expected content. This is useful for regression tests etc.
//
// This program exits with an error status of 2 on error, exit status of 0 if
// the file matched the expected contents, and exit status of 1 if it did not
// contain the expected contents.
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/StringSet.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/PrettyStackTrace.h"
#include "llvm/Support/Regex.h"
#include "llvm/Support/Signals.h"
#include "llvm/Support/SourceMgr.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <cctype>
#include <map>
#include <string>
#include <system_error>
#include <vector>
using namespace llvm;
static cl::opt<std::string>
CheckFilename(cl::Positional, cl::desc("<check-file>"), cl::Required);
static cl::opt<std::string>
InputFilename("input-file", cl::desc("File to check (defaults to stdin)"),
cl::init("-"), cl::value_desc("filename"));
static cl::list<std::string>
CheckPrefixes("check-prefix",
cl::desc("Prefix to use from check file (defaults to 'CHECK')"));
static cl::opt<bool>
NoCanonicalizeWhiteSpace("strict-whitespace",
cl::desc("Do not treat all horizontal whitespace as equivalent"));
static cl::list<std::string> ImplicitCheckNot(
"implicit-check-not",
cl::desc("Add an implicit negative check with this pattern to every\n"
"positive check. This can be used to ensure that no instances of\n"
"this pattern occur which are not matched by a positive pattern"),
cl::value_desc("pattern"));
static cl::opt<bool> AllowEmptyInput(
"allow-empty", cl::init(false),
cl::desc("Allow the input file to be empty. This is useful when making\n"
"checks that some error message does not occur, for example."));
typedef cl::list<std::string>::const_iterator prefix_iterator;
//===----------------------------------------------------------------------===//
// Pattern Handling Code.
//===----------------------------------------------------------------------===//
namespace Check {
enum CheckType {
CheckNone = 0,
CheckPlain,
CheckNext,
CheckSame,
CheckNot,
CheckDAG,
CheckLabel,
/// MatchEOF - When set, this pattern only matches the end of file. This is
/// used for trailing CHECK-NOTs.
CheckEOF
};
}
class Pattern {
SMLoc PatternLoc;
Check::CheckType CheckTy;
/// FixedStr - If non-empty, this pattern is a fixed string match with the
/// specified fixed string.
StringRef FixedStr;
/// RegEx - If non-empty, this is a regex pattern.
std::string RegExStr;
/// \brief Contains the number of line this pattern is in.
unsigned LineNumber;
/// VariableUses - Entries in this vector map to uses of a variable in the
/// pattern, e.g. "foo[[bar]]baz". In this case, the RegExStr will contain
/// "foobaz" and we'll get an entry in this vector that tells us to insert the
/// value of bar at offset 3.
std::vector<std::pair<StringRef, unsigned> > VariableUses;
/// VariableDefs - Maps definitions of variables to their parenthesized
/// capture numbers.
/// E.g. for the pattern "foo[[bar:.*]]baz", VariableDefs will map "bar" to 1.
std::map<StringRef, unsigned> VariableDefs;
public:
Pattern(Check::CheckType Ty)
: CheckTy(Ty) { }
/// getLoc - Return the location in source code.
SMLoc getLoc() const { return PatternLoc; }
/// ParsePattern - Parse the given string into the Pattern. Prefix provides
/// which prefix is being matched, SM provides the SourceMgr used for error
/// reports, and LineNumber is the line number in the input file from which
/// the pattern string was read. Returns true in case of an error, false
/// otherwise.
bool ParsePattern(StringRef PatternStr,
StringRef Prefix,
SourceMgr &SM,
unsigned LineNumber);
/// Match - Match the pattern string against the input buffer Buffer. This
/// returns the position that is matched or npos if there is no match. If
/// there is a match, the size of the matched string is returned in MatchLen.
///
/// The VariableTable StringMap provides the current values of filecheck
/// variables and is updated if this match defines new values.
size_t Match(StringRef Buffer, size_t &MatchLen,
StringMap<StringRef> &VariableTable) const;
/// PrintFailureInfo - Print additional information about a failure to match
/// involving this pattern.
void PrintFailureInfo(const SourceMgr &SM, StringRef Buffer,
const StringMap<StringRef> &VariableTable) const;
bool hasVariable() const { return !(VariableUses.empty() &&
VariableDefs.empty()); }
Check::CheckType getCheckTy() const { return CheckTy; }
private:
bool AddRegExToRegEx(StringRef RS, unsigned &CurParen, SourceMgr &SM);
void AddBackrefToRegEx(unsigned BackrefNum);
/// ComputeMatchDistance - Compute an arbitrary estimate for the quality of
/// matching this pattern at the start of \arg Buffer; a distance of zero
/// should correspond to a perfect match.
unsigned ComputeMatchDistance(StringRef Buffer,
const StringMap<StringRef> &VariableTable) const;
/// \brief Evaluates expression and stores the result to \p Value.
/// \return true on success. false when the expression has invalid syntax.
bool EvaluateExpression(StringRef Expr, std::string &Value) const;
/// \brief Finds the closing sequence of a regex variable usage or
/// definition. Str has to point in the beginning of the definition
/// (right after the opening sequence).
/// \return offset of the closing sequence within Str, or npos if it was not
/// found.
size_t FindRegexVarEnd(StringRef Str, SourceMgr &SM);
};
bool Pattern::ParsePattern(StringRef PatternStr,
StringRef Prefix,
SourceMgr &SM,
unsigned LineNumber) {
this->LineNumber = LineNumber;
PatternLoc = SMLoc::getFromPointer(PatternStr.data());
// Ignore trailing whitespace.
while (!PatternStr.empty() &&
(PatternStr.back() == ' ' || PatternStr.back() == '\t'))
PatternStr = PatternStr.substr(0, PatternStr.size()-1);
// Check that there is something on the line.
if (PatternStr.empty()) {
SM.PrintMessage(PatternLoc, SourceMgr::DK_Error,
"found empty check string with prefix '" +
Prefix + ":'");
return true;
}
// Check to see if this is a fixed string, or if it has regex pieces.
if (PatternStr.size() < 2 ||
(PatternStr.find("{{") == StringRef::npos &&
PatternStr.find("[[") == StringRef::npos)) {
FixedStr = PatternStr;
return false;
}
// Paren value #0 is for the fully matched string. Any new parenthesized
// values add from there.
unsigned CurParen = 1;
// Otherwise, there is at least one regex piece. Build up the regex pattern
// by escaping scary characters in fixed strings, building up one big regex.
while (!PatternStr.empty()) {
// RegEx matches.
if (PatternStr.startswith("{{")) {
// This is the start of a regex match. Scan for the }}.
size_t End = PatternStr.find("}}");
if (End == StringRef::npos) {
SM.PrintMessage(SMLoc::getFromPointer(PatternStr.data()),
SourceMgr::DK_Error,
"found start of regex string with no end '}}'");
return true;
}
// Enclose {{}} patterns in parens just like [[]] even though we're not
// capturing the result for any purpose. This is required in case the
// expression contains an alternation like: CHECK: abc{{x|z}}def. We
// want this to turn into: "abc(x|z)def" not "abcx|zdef".
RegExStr += '(';
++CurParen;
if (AddRegExToRegEx(PatternStr.substr(2, End-2), CurParen, SM))
return true;
RegExStr += ')';
PatternStr = PatternStr.substr(End+2);
continue;
}
// Named RegEx matches. These are of two forms: [[foo:.*]] which matches .*
// (or some other regex) and assigns it to the FileCheck variable 'foo'. The
// second form is [[foo]] which is a reference to foo. The variable name
// itself must be of the form "[a-zA-Z_][0-9a-zA-Z_]*", otherwise we reject
// it. This is to catch some common errors.
if (PatternStr.startswith("[[")) {
// Find the closing bracket pair ending the match. End is going to be an
// offset relative to the beginning of the match string.
size_t End = FindRegexVarEnd(PatternStr.substr(2), SM);
if (End == StringRef::npos) {
SM.PrintMessage(SMLoc::getFromPointer(PatternStr.data()),
SourceMgr::DK_Error,
"invalid named regex reference, no ]] found");
return true;
}
StringRef MatchStr = PatternStr.substr(2, End);
PatternStr = PatternStr.substr(End+4);
// Get the regex name (e.g. "foo").
size_t NameEnd = MatchStr.find(':');
StringRef Name = MatchStr.substr(0, NameEnd);
if (Name.empty()) {
SM.PrintMessage(SMLoc::getFromPointer(Name.data()), SourceMgr::DK_Error,
"invalid name in named regex: empty name");
return true;
}
// Verify that the name/expression is well formed. FileCheck currently
// supports @LINE, @LINE+number, @LINE-number expressions. The check here
// is relaxed, more strict check is performed in \c EvaluateExpression.
bool IsExpression = false;
for (unsigned i = 0, e = Name.size(); i != e; ++i) {
if (i == 0 && Name[i] == '@') {
if (NameEnd != StringRef::npos) {
SM.PrintMessage(SMLoc::getFromPointer(Name.data()),
SourceMgr::DK_Error,
"invalid name in named regex definition");
return true;
}
IsExpression = true;
continue;
}
if (Name[i] != '_' && !isalnum(Name[i]) &&
(!IsExpression || (Name[i] != '+' && Name[i] != '-'))) {
SM.PrintMessage(SMLoc::getFromPointer(Name.data()+i),
SourceMgr::DK_Error, "invalid name in named regex");
return true;
}
}
// Name can't start with a digit.
if (isdigit(static_cast<unsigned char>(Name[0]))) {
SM.PrintMessage(SMLoc::getFromPointer(Name.data()), SourceMgr::DK_Error,
"invalid name in named regex");
return true;
}
// Handle [[foo]].
if (NameEnd == StringRef::npos) {
// Handle variables that were defined earlier on the same line by
// emitting a backreference.
if (VariableDefs.find(Name) != VariableDefs.end()) {
unsigned VarParenNum = VariableDefs[Name];
if (VarParenNum < 1 || VarParenNum > 9) {
SM.PrintMessage(SMLoc::getFromPointer(Name.data()),
SourceMgr::DK_Error,
"Can't back-reference more than 9 variables");
return true;
}
AddBackrefToRegEx(VarParenNum);
} else {
VariableUses.push_back(std::make_pair(Name, RegExStr.size()));
}
continue;
}
// Handle [[foo:.*]].
VariableDefs[Name] = CurParen;
RegExStr += '(';
++CurParen;
if (AddRegExToRegEx(MatchStr.substr(NameEnd+1), CurParen, SM))
return true;
RegExStr += ')';
}
// Handle fixed string matches.
// Find the end, which is the start of the next regex.
size_t FixedMatchEnd = PatternStr.find("{{");
FixedMatchEnd = std::min(FixedMatchEnd, PatternStr.find("[["));
RegExStr += Regex::escape(PatternStr.substr(0, FixedMatchEnd));
PatternStr = PatternStr.substr(FixedMatchEnd);
}
return false;
}
bool Pattern::AddRegExToRegEx(StringRef RS, unsigned &CurParen,
SourceMgr &SM) {
Regex R(RS);
std::string Error;
if (!R.isValid(Error)) {
SM.PrintMessage(SMLoc::getFromPointer(RS.data()), SourceMgr::DK_Error,
"invalid regex: " + Error);
return true;
}
RegExStr += RS.str();
CurParen += R.getNumMatches();
return false;
}
void Pattern::AddBackrefToRegEx(unsigned BackrefNum) {
assert(BackrefNum >= 1 && BackrefNum <= 9 && "Invalid backref number");
std::string Backref = std::string("\\") +
std::string(1, '0' + BackrefNum);
RegExStr += Backref;
}
bool Pattern::EvaluateExpression(StringRef Expr, std::string &Value) const {
// The only supported expression is @LINE([\+-]\d+)?
if (!Expr.startswith("@LINE"))
return false;
Expr = Expr.substr(StringRef("@LINE").size());
int Offset = 0;
if (!Expr.empty()) {
if (Expr[0] == '+')
Expr = Expr.substr(1);
else if (Expr[0] != '-')
return false;
if (Expr.getAsInteger(10, Offset))
return false;
}
Value = llvm::itostr(LineNumber + Offset);
return true;
}
/// Match - Match the pattern string against the input buffer Buffer. This
/// returns the position that is matched or npos if there is no match. If
/// there is a match, the size of the matched string is returned in MatchLen.
size_t Pattern::Match(StringRef Buffer, size_t &MatchLen,
StringMap<StringRef> &VariableTable) const {
// If this is the EOF pattern, match it immediately.
if (CheckTy == Check::CheckEOF) {
MatchLen = 0;
return Buffer.size();
}
// If this is a fixed string pattern, just match it now.
if (!FixedStr.empty()) {
MatchLen = FixedStr.size();
return Buffer.find(FixedStr);
}
// Regex match.
// If there are variable uses, we need to create a temporary string with the
// actual value.
StringRef RegExToMatch = RegExStr;
std::string TmpStr;
if (!VariableUses.empty()) {
TmpStr = RegExStr;
unsigned InsertOffset = 0;
for (const auto &VariableUse : VariableUses) {
std::string Value;
if (VariableUse.first[0] == '@') {
if (!EvaluateExpression(VariableUse.first, Value))
return StringRef::npos;
} else {
StringMap<StringRef>::iterator it =
VariableTable.find(VariableUse.first);
// If the variable is undefined, return an error.
if (it == VariableTable.end())
return StringRef::npos;
// Look up the value and escape it so that we can put it into the regex.
Value += Regex::escape(it->second);
}
// Plop it into the regex at the adjusted offset.
TmpStr.insert(TmpStr.begin() + VariableUse.second + InsertOffset,
Value.begin(), Value.end());
InsertOffset += Value.size();
}
// Match the newly constructed regex.
RegExToMatch = TmpStr;
}
SmallVector<StringRef, 4> MatchInfo;
if (!Regex(RegExToMatch, Regex::Newline).match(Buffer, &MatchInfo))
return StringRef::npos;
// Successful regex match.
assert(!MatchInfo.empty() && "Didn't get any match");
StringRef FullMatch = MatchInfo[0];
// If this defines any variables, remember their values.
for (const auto &VariableDef : VariableDefs) {
assert(VariableDef.second < MatchInfo.size() && "Internal paren error");
VariableTable[VariableDef.first] = MatchInfo[VariableDef.second];
}
MatchLen = FullMatch.size();
return FullMatch.data()-Buffer.data();
}
unsigned Pattern::ComputeMatchDistance(StringRef Buffer,
const StringMap<StringRef> &VariableTable) const {
// Just compute the number of matching characters. For regular expressions, we
// just compare against the regex itself and hope for the best.
//
// FIXME: One easy improvement here is have the regex lib generate a single
// example regular expression which matches, and use that as the example
// string.
StringRef ExampleString(FixedStr);
if (ExampleString.empty())
ExampleString = RegExStr;
// Only compare up to the first line in the buffer, or the string size.
StringRef BufferPrefix = Buffer.substr(0, ExampleString.size());
BufferPrefix = BufferPrefix.split('\n').first;
return BufferPrefix.edit_distance(ExampleString);
}
void Pattern::PrintFailureInfo(const SourceMgr &SM, StringRef Buffer,
const StringMap<StringRef> &VariableTable) const{
// If this was a regular expression using variables, print the current
// variable values.
if (!VariableUses.empty()) {
for (const auto &VariableUse : VariableUses) {
SmallString<256> Msg;
raw_svector_ostream OS(Msg);
StringRef Var = VariableUse.first;
if (Var[0] == '@') {
std::string Value;
if (EvaluateExpression(Var, Value)) {
OS << "with expression \"";
OS.write_escaped(Var) << "\" equal to \"";
OS.write_escaped(Value) << "\"";
} else {
OS << "uses incorrect expression \"";
OS.write_escaped(Var) << "\"";
}
} else {
StringMap<StringRef>::const_iterator it = VariableTable.find(Var);
// Check for undefined variable references.
if (it == VariableTable.end()) {
OS << "uses undefined variable \"";
OS.write_escaped(Var) << "\"";
} else {
OS << "with variable \"";
OS.write_escaped(Var) << "\" equal to \"";
OS.write_escaped(it->second) << "\"";
}
}
SM.PrintMessage(SMLoc::getFromPointer(Buffer.data()), SourceMgr::DK_Note,
OS.str());
}
}
// Attempt to find the closest/best fuzzy match. Usually an error happens
// because some string in the output didn't exactly match. In these cases, we
// would like to show the user a best guess at what "should have" matched, to
// save them having to actually check the input manually.
size_t NumLinesForward = 0;
size_t Best = StringRef::npos;
double BestQuality = 0;
// Use an arbitrary 4k limit on how far we will search.
for (size_t i = 0, e = std::min(size_t(4096), Buffer.size()); i != e; ++i) {
if (Buffer[i] == '\n')
++NumLinesForward;
// Patterns have leading whitespace stripped, so skip whitespace when
// looking for something which looks like a pattern.
if (Buffer[i] == ' ' || Buffer[i] == '\t')
continue;
// Compute the "quality" of this match as an arbitrary combination of the
// match distance and the number of lines skipped to get to this match.
unsigned Distance = ComputeMatchDistance(Buffer.substr(i), VariableTable);
double Quality = Distance + (NumLinesForward / 100.);
if (Quality < BestQuality || Best == StringRef::npos) {
Best = i;
BestQuality = Quality;
}
}
// Print the "possible intended match here" line if we found something
// reasonable and not equal to what we showed in the "scanning from here"
// line.
if (Best && Best != StringRef::npos && BestQuality < 50) {
SM.PrintMessage(SMLoc::getFromPointer(Buffer.data() + Best),
SourceMgr::DK_Note, "possible intended match here");
// FIXME: If we wanted to be really friendly we would show why the match
// failed, as it can be hard to spot simple one character differences.
}
}
size_t Pattern::FindRegexVarEnd(StringRef Str, SourceMgr &SM) {
// Offset keeps track of the current offset within the input Str
size_t Offset = 0;
// [...] Nesting depth
size_t BracketDepth = 0;
while (!Str.empty()) {
if (Str.startswith("]]") && BracketDepth == 0)
return Offset;
if (Str[0] == '\\') {
// Backslash escapes the next char within regexes, so skip them both.
Str = Str.substr(2);
Offset += 2;
} else {
switch (Str[0]) {
default:
break;
case '[':
BracketDepth++;
break;
case ']':
if (BracketDepth == 0) {
SM.PrintMessage(SMLoc::getFromPointer(Str.data()),
SourceMgr::DK_Error,
"missing closing \"]\" for regex variable");
exit(1);
}
BracketDepth--;
break;
}
Str = Str.substr(1);
Offset++;
}
}
return StringRef::npos;
}
//===----------------------------------------------------------------------===//
// Check Strings.
//===----------------------------------------------------------------------===//
/// CheckString - This is a check that we found in the input file.
struct CheckString {
/// Pat - The pattern to match.
Pattern Pat;
/// Prefix - Which prefix name this check matched.
StringRef Prefix;
/// Loc - The location in the match file that the check string was specified.
SMLoc Loc;
/// CheckTy - Specify what kind of check this is. e.g. CHECK-NEXT: directive,
/// as opposed to a CHECK: directive.
Check::CheckType CheckTy;
/// DagNotStrings - These are all of the strings that are disallowed from
/// occurring between this match string and the previous one (or start of
/// file).
std::vector<Pattern> DagNotStrings;
CheckString(const Pattern &P,
StringRef S,
SMLoc L,
Check::CheckType Ty)
: Pat(P), Prefix(S), Loc(L), CheckTy(Ty) {}
/// Check - Match check string and its "not strings" and/or "dag strings".
size_t Check(const SourceMgr &SM, StringRef Buffer, bool IsLabelScanMode,
size_t &MatchLen, StringMap<StringRef> &VariableTable) const;
/// CheckNext - Verify there is a single line in the given buffer.
bool CheckNext(const SourceMgr &SM, StringRef Buffer) const;
/// CheckSame - Verify there is no newline in the given buffer.
bool CheckSame(const SourceMgr &SM, StringRef Buffer) const;
/// CheckNot - Verify there's no "not strings" in the given buffer.
bool CheckNot(const SourceMgr &SM, StringRef Buffer,
const std::vector<const Pattern *> &NotStrings,
StringMap<StringRef> &VariableTable) const;
/// CheckDag - Match "dag strings" and their mixed "not strings".
size_t CheckDag(const SourceMgr &SM, StringRef Buffer,
std::vector<const Pattern *> &NotStrings,
StringMap<StringRef> &VariableTable) const;
};
/// Canonicalize whitespaces in the input file. Line endings are replaced
/// with UNIX-style '\n'.
///
/// \param PreserveHorizontal Don't squash consecutive horizontal whitespace
/// characters to a single space.
static std::unique_ptr<MemoryBuffer>
CanonicalizeInputFile(std::unique_ptr<MemoryBuffer> MB,
bool PreserveHorizontal) {
SmallString<128> NewFile;
NewFile.reserve(MB->getBufferSize());
for (const char *Ptr = MB->getBufferStart(), *End = MB->getBufferEnd();
Ptr != End; ++Ptr) {
// Eliminate trailing dosish \r.
if (Ptr <= End - 2 && Ptr[0] == '\r' && Ptr[1] == '\n') {
continue;
}
// If current char is not a horizontal whitespace or if horizontal
// whitespace canonicalization is disabled, dump it to output as is.
if (PreserveHorizontal || (*Ptr != ' ' && *Ptr != '\t')) {
NewFile.push_back(*Ptr);
continue;
}
// Otherwise, add one space and advance over neighboring space.
NewFile.push_back(' ');
while (Ptr+1 != End &&
(Ptr[1] == ' ' || Ptr[1] == '\t'))
++Ptr;
}
return std::unique_ptr<MemoryBuffer>(
MemoryBuffer::getMemBufferCopy(NewFile.str(), MB->getBufferIdentifier()));
}
static bool IsPartOfWord(char c) {
return (isalnum(c) || c == '-' || c == '_');
}
// Get the size of the prefix extension.
static size_t CheckTypeSize(Check::CheckType Ty) {
switch (Ty) {
case Check::CheckNone:
return 0;
case Check::CheckPlain:
return sizeof(":") - 1;
case Check::CheckNext:
return sizeof("-NEXT:") - 1;
case Check::CheckSame:
return sizeof("-SAME:") - 1;
case Check::CheckNot:
return sizeof("-NOT:") - 1;
case Check::CheckDAG:
return sizeof("-DAG:") - 1;
case Check::CheckLabel:
return sizeof("-LABEL:") - 1;
case Check::CheckEOF:
llvm_unreachable("Should not be using EOF size");
}
llvm_unreachable("Bad check type");
}
static Check::CheckType FindCheckType(StringRef Buffer, StringRef Prefix) {
char NextChar = Buffer[Prefix.size()];
// Verify that the : is present after the prefix.
if (NextChar == ':')
return Check::CheckPlain;
if (NextChar != '-')
return Check::CheckNone;
StringRef Rest = Buffer.drop_front(Prefix.size() + 1);
if (Rest.startswith("NEXT:"))
return Check::CheckNext;
if (Rest.startswith("SAME:"))
return Check::CheckSame;
if (Rest.startswith("NOT:"))
return Check::CheckNot;
if (Rest.startswith("DAG:"))
return Check::CheckDAG;
if (Rest.startswith("LABEL:"))
return Check::CheckLabel;
return Check::CheckNone;
}
// From the given position, find the next character after the word.
static size_t SkipWord(StringRef Str, size_t Loc) {
while (Loc < Str.size() && IsPartOfWord(Str[Loc]))
++Loc;
return Loc;
}
// Try to find the first match in buffer for any prefix. If a valid match is
// found, return that prefix and set its type and location. If there are almost
// matches (e.g. the actual prefix string is found, but is not an actual check
// string), but no valid match, return an empty string and set the position to
// resume searching from. If no partial matches are found, return an empty
// string and the location will be StringRef::npos. If one prefix is a substring
// of another, the maximal match should be found. e.g. if "A" and "AA" are
// prefixes then AA-CHECK: should match the second one.
static StringRef FindFirstCandidateMatch(StringRef &Buffer,
Check::CheckType &CheckTy,
size_t &CheckLoc) {
StringRef FirstPrefix;
size_t FirstLoc = StringRef::npos;
size_t SearchLoc = StringRef::npos;
Check::CheckType FirstTy = Check::CheckNone;
CheckTy = Check::CheckNone;
CheckLoc = StringRef::npos;
for (StringRef Prefix : CheckPrefixes) {
size_t PrefixLoc = Buffer.find(Prefix);
if (PrefixLoc == StringRef::npos)
continue;
// Track where we are searching for invalid prefixes that look almost right.
// We need to only advance to the first partial match on the next attempt
// since a partial match could be a substring of a later, valid prefix.
// Need to skip to the end of the word, otherwise we could end up
// matching a prefix in a substring later.
if (PrefixLoc < SearchLoc)
SearchLoc = SkipWord(Buffer, PrefixLoc);
// We only want to find the first match to avoid skipping some.
if (PrefixLoc > FirstLoc)
continue;
// If one matching check-prefix is a prefix of another, choose the
// longer one.
if (PrefixLoc == FirstLoc && Prefix.size() < FirstPrefix.size())
continue;
StringRef Rest = Buffer.drop_front(PrefixLoc);
// Make sure we have actually found the prefix, and not a word containing
// it. This should also prevent matching the wrong prefix when one is a
// substring of another.
if (PrefixLoc != 0 && IsPartOfWord(Buffer[PrefixLoc - 1]))
FirstTy = Check::CheckNone;
else
FirstTy = FindCheckType(Rest, Prefix);
FirstLoc = PrefixLoc;
FirstPrefix = Prefix;
}
// If the first prefix is invalid, we should continue the search after it.
if (FirstTy == Check::CheckNone) {
CheckLoc = SearchLoc;
return "";
}
CheckTy = FirstTy;
CheckLoc = FirstLoc;
return FirstPrefix;
}
static StringRef FindFirstMatchingPrefix(StringRef &Buffer,
unsigned &LineNumber,
Check::CheckType &CheckTy,
size_t &CheckLoc) {
while (!Buffer.empty()) {
StringRef Prefix = FindFirstCandidateMatch(Buffer, CheckTy, CheckLoc);
// If we found a real match, we are done.
if (!Prefix.empty()) {
LineNumber += Buffer.substr(0, CheckLoc).count('\n');
return Prefix;
}
// We didn't find any almost matches either, we are also done.
if (CheckLoc == StringRef::npos)
return StringRef();
LineNumber += Buffer.substr(0, CheckLoc + 1).count('\n');
// Advance to the last possible match we found and try again.
Buffer = Buffer.drop_front(CheckLoc + 1);
}
return StringRef();
}
/// ReadCheckFile - Read the check file, which specifies the sequence of
/// expected strings. The strings are added to the CheckStrings vector.
/// Returns true in case of an error, false otherwise.
static bool ReadCheckFile(SourceMgr &SM,
std::vector<CheckString> &CheckStrings) {
ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
MemoryBuffer::getFileOrSTDIN(CheckFilename);
if (std::error_code EC = FileOrErr.getError()) {
errs() << "Could not open check file '" << CheckFilename
<< "': " << EC.message() << '\n';
return true;
}
// If we want to canonicalize whitespace, strip excess whitespace from the
// buffer containing the CHECK lines. Remove DOS style line endings.
std::unique_ptr<MemoryBuffer> F = CanonicalizeInputFile(
std::move(FileOrErr.get()), NoCanonicalizeWhiteSpace);
// Find all instances of CheckPrefix followed by : in the file.
StringRef Buffer = F->getBuffer();
SM.AddNewSourceBuffer(std::move(F), SMLoc());
std::vector<Pattern> ImplicitNegativeChecks;
for (const auto &PatternString : ImplicitCheckNot) {
// Create a buffer with fake command line content in order to display the
// command line option responsible for the specific implicit CHECK-NOT.
std::string Prefix = std::string("-") + ImplicitCheckNot.ArgStr + "='";
std::string Suffix = "'";
std::unique_ptr<MemoryBuffer> CmdLine = MemoryBuffer::getMemBufferCopy(
Prefix + PatternString + Suffix, "command line");
StringRef PatternInBuffer =
CmdLine->getBuffer().substr(Prefix.size(), PatternString.size());
SM.AddNewSourceBuffer(std::move(CmdLine), SMLoc());
ImplicitNegativeChecks.push_back(Pattern(Check::CheckNot));
ImplicitNegativeChecks.back().ParsePattern(PatternInBuffer,
"IMPLICIT-CHECK", SM, 0);
}
std::vector<Pattern> DagNotMatches = ImplicitNegativeChecks;
// LineNumber keeps track of the line on which CheckPrefix instances are
// found.
unsigned LineNumber = 1;
while (1) {
Check::CheckType CheckTy;
size_t PrefixLoc;
// See if a prefix occurs in the memory buffer.
StringRef UsedPrefix = FindFirstMatchingPrefix(Buffer,
LineNumber,
CheckTy,
PrefixLoc);
if (UsedPrefix.empty())
break;
Buffer = Buffer.drop_front(PrefixLoc);
// Location to use for error messages.
const char *UsedPrefixStart = Buffer.data() + (PrefixLoc == 0 ? 0 : 1);
// PrefixLoc is to the start of the prefix. Skip to the end.
Buffer = Buffer.drop_front(UsedPrefix.size() + CheckTypeSize(CheckTy));
// Okay, we found the prefix, yay. Remember the rest of the line, but ignore
// leading and trailing whitespace.
Buffer = Buffer.substr(Buffer.find_first_not_of(" \t"));
// Scan ahead to the end of line.
size_t EOL = Buffer.find_first_of("\n\r");
// Remember the location of the start of the pattern, for diagnostics.
SMLoc PatternLoc = SMLoc::getFromPointer(Buffer.data());
// Parse the pattern.
Pattern P(CheckTy);
if (P.ParsePattern(Buffer.substr(0, EOL), UsedPrefix, SM, LineNumber))
return true;
// Verify that CHECK-LABEL lines do not define or use variables
if ((CheckTy == Check::CheckLabel) && P.hasVariable()) {
SM.PrintMessage(SMLoc::getFromPointer(UsedPrefixStart),
SourceMgr::DK_Error,
"found '" + UsedPrefix + "-LABEL:'"
" with variable definition or use");
return true;
}
Buffer = Buffer.substr(EOL);
// Verify that CHECK-NEXT lines have at least one CHECK line before them.
if ((CheckTy == Check::CheckNext || CheckTy == Check::CheckSame) &&
CheckStrings.empty()) {
StringRef Type = CheckTy == Check::CheckNext ? "NEXT" : "SAME";
SM.PrintMessage(SMLoc::getFromPointer(UsedPrefixStart),
SourceMgr::DK_Error,
"found '" + UsedPrefix + "-" + Type + "' without previous '"
+ UsedPrefix + ": line");
return true;
}
// Handle CHECK-DAG/-NOT.
if (CheckTy == Check::CheckDAG || CheckTy == Check::CheckNot) {
DagNotMatches.push_back(P);
continue;
}
// Okay, add the string we captured to the output vector and move on.
CheckStrings.emplace_back(P, UsedPrefix, PatternLoc, CheckTy);
std::swap(DagNotMatches, CheckStrings.back().DagNotStrings);
DagNotMatches = ImplicitNegativeChecks;
}
// Add an EOF pattern for any trailing CHECK-DAG/-NOTs, and use the first
// prefix as a filler for the error message.
if (!DagNotMatches.empty()) {
CheckStrings.emplace_back(Pattern(Check::CheckEOF), *CheckPrefixes.begin(),
SMLoc::getFromPointer(Buffer.data()),
Check::CheckEOF);
std::swap(DagNotMatches, CheckStrings.back().DagNotStrings);
}
if (CheckStrings.empty()) {
errs() << "error: no check strings found with prefix"
<< (CheckPrefixes.size() > 1 ? "es " : " ");
prefix_iterator I = CheckPrefixes.begin();
prefix_iterator E = CheckPrefixes.end();
if (I != E) {
errs() << "\'" << *I << ":'";
++I;
}
for (; I != E; ++I)
errs() << ", \'" << *I << ":'";
errs() << '\n';
return true;
}
return false;
}
static void PrintCheckFailed(const SourceMgr &SM, const SMLoc &Loc,
const Pattern &Pat, StringRef Buffer,
StringMap<StringRef> &VariableTable) {
// Otherwise, we have an error, emit an error message.
SM.PrintMessage(Loc, SourceMgr::DK_Error,
"expected string not found in input");
// Print the "scanning from here" line. If the current position is at the
// end of a line, advance to the start of the next line.
Buffer = Buffer.substr(Buffer.find_first_not_of(" \t\n\r"));
SM.PrintMessage(SMLoc::getFromPointer(Buffer.data()), SourceMgr::DK_Note,
"scanning from here");
// Allow the pattern to print additional information if desired.
Pat.PrintFailureInfo(SM, Buffer, VariableTable);
}
static void PrintCheckFailed(const SourceMgr &SM, const CheckString &CheckStr,
StringRef Buffer,
StringMap<StringRef> &VariableTable) {
PrintCheckFailed(SM, CheckStr.Loc, CheckStr.Pat, Buffer, VariableTable);
}
/// CountNumNewlinesBetween - Count the number of newlines in the specified
/// range.
static unsigned CountNumNewlinesBetween(StringRef Range,
const char *&FirstNewLine) {
unsigned NumNewLines = 0;
while (1) {
// Scan for newline.
Range = Range.substr(Range.find_first_of("\n\r"));
if (Range.empty()) return NumNewLines;
++NumNewLines;
// Handle \n\r and \r\n as a single newline.
if (Range.size() > 1 &&
(Range[1] == '\n' || Range[1] == '\r') &&
(Range[0] != Range[1]))
Range = Range.substr(1);
Range = Range.substr(1);
if (NumNewLines == 1)
FirstNewLine = Range.begin();
}
}
size_t CheckString::Check(const SourceMgr &SM, StringRef Buffer,
bool IsLabelScanMode, size_t &MatchLen,
StringMap<StringRef> &VariableTable) const {
size_t LastPos = 0;
std::vector<const Pattern *> NotStrings;
// IsLabelScanMode is true when we are scanning forward to find CHECK-LABEL
// bounds; we have not processed variable definitions within the bounded block
// yet so cannot handle any final CHECK-DAG yet; this is handled when going
// over the block again (including the last CHECK-LABEL) in normal mode.
if (!IsLabelScanMode) {
// Match "dag strings" (with mixed "not strings" if any).
LastPos = CheckDag(SM, Buffer, NotStrings, VariableTable);
if (LastPos == StringRef::npos)
return StringRef::npos;
}
// Match itself from the last position after matching CHECK-DAG.
StringRef MatchBuffer = Buffer.substr(LastPos);
size_t MatchPos = Pat.Match(MatchBuffer, MatchLen, VariableTable);
if (MatchPos == StringRef::npos) {
PrintCheckFailed(SM, *this, MatchBuffer, VariableTable);
return StringRef::npos;
}
// Similar to the above, in "label-scan mode" we can't yet handle CHECK-NEXT
// or CHECK-NOT
if (!IsLabelScanMode) {
StringRef SkippedRegion = Buffer.substr(LastPos, MatchPos);
// If this check is a "CHECK-NEXT", verify that the previous match was on
// the previous line (i.e. that there is one newline between them).
if (CheckNext(SM, SkippedRegion))
return StringRef::npos;
// If this check is a "CHECK-SAME", verify that the previous match was on
// the same line (i.e. that there is no newline between them).
if (CheckSame(SM, SkippedRegion))
return StringRef::npos;
// If this match had "not strings", verify that they don't exist in the
// skipped region.
if (CheckNot(SM, SkippedRegion, NotStrings, VariableTable))
return StringRef::npos;
}
return LastPos + MatchPos;
}
bool CheckString::CheckNext(const SourceMgr &SM, StringRef Buffer) const {
if (CheckTy != Check::CheckNext)
return false;
// Count the number of newlines between the previous match and this one.
assert(Buffer.data() !=
SM.getMemoryBuffer(
SM.FindBufferContainingLoc(
SMLoc::getFromPointer(Buffer.data())))->getBufferStart() &&
"CHECK-NEXT can't be the first check in a file");
const char *FirstNewLine = nullptr;
unsigned NumNewLines = CountNumNewlinesBetween(Buffer, FirstNewLine);
if (NumNewLines == 0) {
SM.PrintMessage(Loc, SourceMgr::DK_Error, Prefix +
"-NEXT: is on the same line as previous match");
SM.PrintMessage(SMLoc::getFromPointer(Buffer.end()),
SourceMgr::DK_Note, "'next' match was here");
SM.PrintMessage(SMLoc::getFromPointer(Buffer.data()), SourceMgr::DK_Note,
"previous match ended here");
return true;
}
if (NumNewLines != 1) {
SM.PrintMessage(Loc, SourceMgr::DK_Error, Prefix +
"-NEXT: is not on the line after the previous match");
SM.PrintMessage(SMLoc::getFromPointer(Buffer.end()),
SourceMgr::DK_Note, "'next' match was here");
SM.PrintMessage(SMLoc::getFromPointer(Buffer.data()), SourceMgr::DK_Note,
"previous match ended here");
SM.PrintMessage(SMLoc::getFromPointer(FirstNewLine), SourceMgr::DK_Note,
"non-matching line after previous match is here");
return true;
}
return false;
}
bool CheckString::CheckSame(const SourceMgr &SM, StringRef Buffer) const {
if (CheckTy != Check::CheckSame)
return false;
// Count the number of newlines between the previous match and this one.
assert(Buffer.data() !=
SM.getMemoryBuffer(SM.FindBufferContainingLoc(
SMLoc::getFromPointer(Buffer.data())))
->getBufferStart() &&
"CHECK-SAME can't be the first check in a file");
const char *FirstNewLine = nullptr;
unsigned NumNewLines = CountNumNewlinesBetween(Buffer, FirstNewLine);
if (NumNewLines != 0) {
SM.PrintMessage(Loc, SourceMgr::DK_Error,
Prefix +
"-SAME: is not on the same line as the previous match");
SM.PrintMessage(SMLoc::getFromPointer(Buffer.end()), SourceMgr::DK_Note,
"'next' match was here");
SM.PrintMessage(SMLoc::getFromPointer(Buffer.data()), SourceMgr::DK_Note,
"previous match ended here");
return true;
}
return false;
}
bool CheckString::CheckNot(const SourceMgr &SM, StringRef Buffer,
const std::vector<const Pattern *> &NotStrings,
StringMap<StringRef> &VariableTable) const {
for (const Pattern *Pat : NotStrings) {
assert((Pat->getCheckTy() == Check::CheckNot) && "Expect CHECK-NOT!");
size_t MatchLen = 0;
size_t Pos = Pat->Match(Buffer, MatchLen, VariableTable);
if (Pos == StringRef::npos) continue;
SM.PrintMessage(SMLoc::getFromPointer(Buffer.data()+Pos),
SourceMgr::DK_Error,
Prefix + "-NOT: string occurred!");
SM.PrintMessage(Pat->getLoc(), SourceMgr::DK_Note,
Prefix + "-NOT: pattern specified here");
return true;
}
return false;
}
size_t CheckString::CheckDag(const SourceMgr &SM, StringRef Buffer,
std::vector<const Pattern *> &NotStrings,
StringMap<StringRef> &VariableTable) const {
if (DagNotStrings.empty())
return 0;
size_t LastPos = 0;
size_t StartPos = LastPos;
for (const Pattern &Pat : DagNotStrings) {
assert((Pat.getCheckTy() == Check::CheckDAG ||
Pat.getCheckTy() == Check::CheckNot) &&
"Invalid CHECK-DAG or CHECK-NOT!");
if (Pat.getCheckTy() == Check::CheckNot) {
NotStrings.push_back(&Pat);
continue;
}
assert((Pat.getCheckTy() == Check::CheckDAG) && "Expect CHECK-DAG!");
size_t MatchLen = 0, MatchPos;
// CHECK-DAG always matches from the start.
StringRef MatchBuffer = Buffer.substr(StartPos);
MatchPos = Pat.Match(MatchBuffer, MatchLen, VariableTable);
// With a group of CHECK-DAGs, a single mismatching means the match on
// that group of CHECK-DAGs fails immediately.
if (MatchPos == StringRef::npos) {
PrintCheckFailed(SM, Pat.getLoc(), Pat, MatchBuffer, VariableTable);
return StringRef::npos;
}
// Re-calc it as the offset relative to the start of the original string.
MatchPos += StartPos;
if (!NotStrings.empty()) {
if (MatchPos < LastPos) {
// Reordered?
SM.PrintMessage(SMLoc::getFromPointer(Buffer.data() + MatchPos),
SourceMgr::DK_Error,
Prefix + "-DAG: found a match of CHECK-DAG"
" reordering across a CHECK-NOT");
SM.PrintMessage(SMLoc::getFromPointer(Buffer.data() + LastPos),
SourceMgr::DK_Note,
Prefix + "-DAG: the farthest match of CHECK-DAG"
" is found here");
SM.PrintMessage(NotStrings[0]->getLoc(), SourceMgr::DK_Note,
Prefix + "-NOT: the crossed pattern specified"
" here");
SM.PrintMessage(Pat.getLoc(), SourceMgr::DK_Note,
Prefix + "-DAG: the reordered pattern specified"
" here");
return StringRef::npos;
}
// All subsequent CHECK-DAGs should be matched from the farthest
// position of all precedent CHECK-DAGs (including this one.)
StartPos = LastPos;
// If there's CHECK-NOTs between two CHECK-DAGs or from CHECK to
// CHECK-DAG, verify that there's no 'not' strings occurred in that
// region.
StringRef SkippedRegion = Buffer.substr(LastPos, MatchPos);
if (CheckNot(SM, SkippedRegion, NotStrings, VariableTable))
return StringRef::npos;
// Clear "not strings".
NotStrings.clear();
}
// Update the last position with CHECK-DAG matches.
LastPos = std::max(MatchPos + MatchLen, LastPos);
}
return LastPos;
}
// A check prefix must contain only alphanumeric, hyphens and underscores.
static bool ValidateCheckPrefix(StringRef CheckPrefix) {
Regex Validator("^[a-zA-Z0-9_-]*$");
return Validator.match(CheckPrefix);
}
static bool ValidateCheckPrefixes() {
StringSet<> PrefixSet;
for (StringRef Prefix : CheckPrefixes) {
// Reject empty prefixes.
if (Prefix == "")
return false;
if (!PrefixSet.insert(Prefix).second)
return false;
if (!ValidateCheckPrefix(Prefix))
return false;
}
return true;
}
// I don't think there's a way to specify an initial value for cl::list,
// so if nothing was specified, add the default
static void AddCheckPrefixIfNeeded() {
if (CheckPrefixes.empty())
CheckPrefixes.push_back("CHECK");
}
int main(int argc, char **argv) {
sys::PrintStackTraceOnErrorSignal();
PrettyStackTraceProgram X(argc, argv);
cl::ParseCommandLineOptions(argc, argv);
if (!ValidateCheckPrefixes()) {
errs() << "Supplied check-prefix is invalid! Prefixes must be unique and "
"start with a letter and contain only alphanumeric characters, "
"hyphens and underscores\n";
return 2;
}
AddCheckPrefixIfNeeded();
SourceMgr SM;
// Read the expected strings from the check file.
std::vector<CheckString> CheckStrings;
if (ReadCheckFile(SM, CheckStrings))
return 2;
// Open the file to check and add it to SourceMgr.
ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
MemoryBuffer::getFileOrSTDIN(InputFilename);
if (std::error_code EC = FileOrErr.getError()) {
errs() << "Could not open input file '" << InputFilename
<< "': " << EC.message() << '\n';
return 2;
}
std::unique_ptr<MemoryBuffer> &File = FileOrErr.get();
if (File->getBufferSize() == 0 && !AllowEmptyInput) {
errs() << "FileCheck error: '" << InputFilename << "' is empty.\n";
return 2;
}
// Remove duplicate spaces in the input file if requested.
// Remove DOS style line endings.
std::unique_ptr<MemoryBuffer> F =
CanonicalizeInputFile(std::move(File), NoCanonicalizeWhiteSpace);
// Check that we have all of the expected strings, in order, in the input
// file.
StringRef Buffer = F->getBuffer();
SM.AddNewSourceBuffer(std::move(F), SMLoc());
/// VariableTable - This holds all the current filecheck variables.
StringMap<StringRef> VariableTable;
bool hasError = false;
unsigned i = 0, j = 0, e = CheckStrings.size();
while (true) {
StringRef CheckRegion;
if (j == e) {
CheckRegion = Buffer;
} else {
const CheckString &CheckLabelStr = CheckStrings[j];
if (CheckLabelStr.CheckTy != Check::CheckLabel) {
++j;
continue;
}
// Scan to next CHECK-LABEL match, ignoring CHECK-NOT and CHECK-DAG
size_t MatchLabelLen = 0;
size_t MatchLabelPos = CheckLabelStr.Check(SM, Buffer, true,
MatchLabelLen, VariableTable);
if (MatchLabelPos == StringRef::npos) {
hasError = true;
break;
}
CheckRegion = Buffer.substr(0, MatchLabelPos + MatchLabelLen);
Buffer = Buffer.substr(MatchLabelPos + MatchLabelLen);
++j;
}
for ( ; i != j; ++i) {
const CheckString &CheckStr = CheckStrings[i];
// Check each string within the scanned region, including a second check
// of any final CHECK-LABEL (to verify CHECK-NOT and CHECK-DAG)
size_t MatchLen = 0;
size_t MatchPos = CheckStr.Check(SM, CheckRegion, false, MatchLen,
VariableTable);
if (MatchPos == StringRef::npos) {
hasError = true;
i = j;
break;
}
CheckRegion = CheckRegion.substr(MatchPos + MatchLen);
}
if (j == e)
break;
}
return hasError ? 1 : 0;
}
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