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//==-- llvm/Support/FileCheck.h ---------------------------*- C++ -*-==//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
/// \file This file has some utilities to use FileCheck as an API
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/Regex.h"
#include "llvm/Support/SourceMgr.h"
#include <string>
#include <vector>
namespace llvm {
/// Contains info about various FileCheck options.
struct FileCheckRequest {
std::vector<std::string> CheckPrefixes;
bool NoCanonicalizeWhiteSpace = false;
std::vector<std::string> ImplicitCheckNot;
std::vector<std::string> GlobalDefines;
bool AllowEmptyInput = false;
bool MatchFullLines = false;
bool IgnoreCase = false;
bool EnableVarScope = false;
bool AllowDeprecatedDagOverlap = false;
bool Verbose = false;
bool VerboseVerbose = false;
// Summary of a FileCheck diagnostic.
namespace Check {
enum FileCheckKind {
CheckNone = 0,
/// Indicates the pattern only matches the end of file. This is used for
/// trailing CHECK-NOTs.
/// Marks when parsing found a -NOT check combined with another CHECK suffix.
/// Marks when parsing found a -COUNT directive with invalid count value.
class FileCheckType {
FileCheckKind Kind;
int Count; ///< optional Count for some checks
FileCheckType(FileCheckKind Kind = CheckNone) : Kind(Kind), Count(1) {}
FileCheckType(const FileCheckType &) = default;
operator FileCheckKind() const { return Kind; }
int getCount() const { return Count; }
FileCheckType &setCount(int C);
// \returns a description of \p Prefix.
std::string getDescription(StringRef Prefix) const;
} // namespace Check
struct FileCheckDiag {
/// What is the FileCheck directive for this diagnostic?
Check::FileCheckType CheckTy;
/// Where is the FileCheck directive for this diagnostic?
unsigned CheckLine, CheckCol;
/// What type of match result does this diagnostic describe?
/// A directive's supplied pattern is said to be either expected or excluded
/// depending on whether the pattern must have or must not have a match in
/// order for the directive to succeed. For example, a CHECK directive's
/// pattern is expected, and a CHECK-NOT directive's pattern is excluded.
/// All match result types whose names end with "Excluded" are for excluded
/// patterns, and all others are for expected patterns.
/// There might be more than one match result for a single pattern. For
/// example, there might be several discarded matches
/// (MatchFoundButDiscarded) before either a good match
/// (MatchFoundAndExpected) or a failure to match (MatchNoneButExpected),
/// and there might be a fuzzy match (MatchFuzzy) after the latter.
enum MatchType {
/// Indicates a good match for an expected pattern.
/// Indicates a match for an excluded pattern.
/// Indicates a match for an expected pattern, but the match is on the
/// wrong line.
/// Indicates a discarded match for an expected pattern.
/// Indicates no match for an excluded pattern.
/// Indicates no match for an expected pattern, but this might follow good
/// matches when multiple matches are expected for the pattern, or it might
/// follow discarded matches for the pattern.
/// Indicates a fuzzy match that serves as a suggestion for the next
/// intended match for an expected pattern with too few or no good matches.
} MatchTy;
/// The search range if MatchTy is MatchNoneAndExcluded or
/// MatchNoneButExpected, or the match range otherwise.
unsigned InputStartLine;
unsigned InputStartCol;
unsigned InputEndLine;
unsigned InputEndCol;
FileCheckDiag(const SourceMgr &SM, const Check::FileCheckType &CheckTy,
SMLoc CheckLoc, MatchType MatchTy, SMRange InputRange);
class FileCheckPatternContext;
struct FileCheckString;
/// FileCheck class takes the request and exposes various methods that
/// use information from the request.
class FileCheck {
FileCheckRequest Req;
std::unique_ptr<FileCheckPatternContext> PatternContext;
// C++17 TODO: make this a plain std::vector.
std::unique_ptr<std::vector<FileCheckString>> CheckStrings;
explicit FileCheck(FileCheckRequest Req);
// Combines the check prefixes into a single regex so that we can efficiently
// scan for any of the set.
// The semantics are that the longest-match wins which matches our regex
// library.
Regex buildCheckPrefixRegex();
/// Reads the check file from \p Buffer and records the expected strings it
/// contains. Errors are reported against \p SM.
/// Only expected strings whose prefix is one of those listed in \p PrefixRE
/// are recorded. \returns true in case of an error, false otherwise.
bool readCheckFile(SourceMgr &SM, StringRef Buffer, Regex &PrefixRE);
bool ValidateCheckPrefixes();
/// Canonicalizes whitespaces in the file. Line endings are replaced with
/// UNIX-style '\n'.
StringRef CanonicalizeFile(MemoryBuffer &MB,
SmallVectorImpl<char> &OutputBuffer);
/// Checks the input to FileCheck provided in the \p Buffer against the
/// expected strings read from the check file and record diagnostics emitted
/// in \p Diags. Errors are recorded against \p SM.
/// \returns false if the input fails to satisfy the checks.
bool checkInput(SourceMgr &SM, StringRef Buffer,
std::vector<FileCheckDiag> *Diags = nullptr);
} // namespace llvm