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gerrit-public.fairphone.software / toolchain / llvm-project / a89e5a41ec7c2c7358fa1d85023cb1c4f3f5d136 / . / llvm / lib / Support / FileCheck.cpp
blob: fb4bbba033b544c19f143c702aff9a6d359487ed [file] [log] [blame]
//===- FileCheck.cpp - Check that File's Contents match what is expected --===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// 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 file implements most of the API that will be used by the FileCheck utility
// as well as various unittests.
//===----------------------------------------------------------------------===//
#include "llvm/Support/FileCheck.h"
#include "FileCheckImpl.h"
#include "llvm/ADT/StringSet.h"
#include "llvm/ADT/Twine.h"
#include "llvm/Support/FormatVariadic.h"
#include <cstdint>
#include <list>
#include <tuple>
#include <utility>
using namespace llvm;
Expected<uint64_t> FileCheckNumericVariableUse::eval() const {
Optional<uint64_t> Value = NumericVariable->getValue();
if (Value)
return *Value;
return make_error<FileCheckUndefVarError>(Name);
}
Expected<uint64_t> FileCheckASTBinop::eval() const {
Expected<uint64_t> LeftOp = LeftOperand->eval();
Expected<uint64_t> RightOp = RightOperand->eval();
// Bubble up any error (e.g. undefined variables) in the recursive
// evaluation.
if (!LeftOp || !RightOp) {
Error Err = Error::success();
if (!LeftOp)
Err = joinErrors(std::move(Err), LeftOp.takeError());
if (!RightOp)
Err = joinErrors(std::move(Err), RightOp.takeError());
return std::move(Err);
}
return EvalBinop(*LeftOp, *RightOp);
}
Expected<std::string> FileCheckNumericSubstitution::getResult() const {
Expected<uint64_t> EvaluatedValue = ExpressionAST->eval();
if (!EvaluatedValue)
return EvaluatedValue.takeError();
return utostr(*EvaluatedValue);
}
Expected<std::string> FileCheckStringSubstitution::getResult() const {
// Look up the value and escape it so that we can put it into the regex.
Expected<StringRef> VarVal = Context->getPatternVarValue(FromStr);
if (!VarVal)
return VarVal.takeError();
return Regex::escape(*VarVal);
}
bool FileCheckPattern::isValidVarNameStart(char C) {
return C == '_' || isalpha(C);
}
Expected<FileCheckPattern::VariableProperties>
FileCheckPattern::parseVariable(StringRef &Str, const SourceMgr &SM) {
if (Str.empty())
return FileCheckErrorDiagnostic::get(SM, Str, "empty variable name");
bool ParsedOneChar = false;
unsigned I = 0;
bool IsPseudo = Str[0] == '@';
// Global vars start with '$'.
if (Str[0] == '$' || IsPseudo)
++I;
for (unsigned E = Str.size(); I != E; ++I) {
if (!ParsedOneChar && !isValidVarNameStart(Str[I]))
return FileCheckErrorDiagnostic::get(SM, Str, "invalid variable name");
// Variable names are composed of alphanumeric characters and underscores.
if (Str[I] != '_' && !isalnum(Str[I]))
break;
ParsedOneChar = true;
}
StringRef Name = Str.take_front(I);
Str = Str.substr(I);
return VariableProperties {Name, IsPseudo};
}
// StringRef holding all characters considered as horizontal whitespaces by
// FileCheck input canonicalization.
constexpr StringLiteral SpaceChars = " \t";
// Parsing helper function that strips the first character in S and returns it.
static char popFront(StringRef &S) {
char C = S.front();
S = S.drop_front();
return C;
}
char FileCheckUndefVarError::ID = 0;
char FileCheckErrorDiagnostic::ID = 0;
char FileCheckNotFoundError::ID = 0;
Expected<FileCheckNumericVariable *>
FileCheckPattern::parseNumericVariableDefinition(
StringRef &Expr, FileCheckPatternContext *Context,
Optional<size_t> LineNumber, const SourceMgr &SM) {
Expected<VariableProperties> ParseVarResult = parseVariable(Expr, SM);
if (!ParseVarResult)
return ParseVarResult.takeError();
StringRef Name = ParseVarResult->Name;
if (ParseVarResult->IsPseudo)
return FileCheckErrorDiagnostic::get(
SM, Name, "definition of pseudo numeric variable unsupported");
// Detect collisions between string and numeric variables when the latter
// is created later than the former.
if (Context->DefinedVariableTable.find(Name) !=
Context->DefinedVariableTable.end())
return FileCheckErrorDiagnostic::get(
SM, Name, "string variable with name '" + Name + "' already exists");
Expr = Expr.ltrim(SpaceChars);
if (!Expr.empty())
return FileCheckErrorDiagnostic::get(
SM, Expr, "unexpected characters after numeric variable name");
FileCheckNumericVariable *DefinedNumericVariable;
auto VarTableIter = Context->GlobalNumericVariableTable.find(Name);
if (VarTableIter != Context->GlobalNumericVariableTable.end())
DefinedNumericVariable = VarTableIter->second;
else
DefinedNumericVariable = Context->makeNumericVariable(Name, LineNumber);
return DefinedNumericVariable;
}
Expected<std::unique_ptr<FileCheckNumericVariableUse>>
FileCheckPattern::parseNumericVariableUse(StringRef Name, bool IsPseudo,
Optional<size_t> LineNumber,
FileCheckPatternContext *Context,
const SourceMgr &SM) {
if (IsPseudo && !Name.equals("@LINE"))
return FileCheckErrorDiagnostic::get(
SM, Name, "invalid pseudo numeric variable '" + Name + "'");
// Numeric variable definitions and uses are parsed in the order in which
// they appear in the CHECK patterns. For each definition, the pointer to the
// class instance of the corresponding numeric variable definition is stored
// in GlobalNumericVariableTable in parsePattern. Therefore, if the pointer
// we get below is null, it means no such variable was defined before. When
// that happens, we create a dummy variable so that parsing can continue. All
// uses of undefined variables, whether string or numeric, are then diagnosed
// in printSubstitutions() after failing to match.
auto VarTableIter = Context->GlobalNumericVariableTable.find(Name);
FileCheckNumericVariable *NumericVariable;
if (VarTableIter != Context->GlobalNumericVariableTable.end())
NumericVariable = VarTableIter->second;
else {
NumericVariable = Context->makeNumericVariable(Name);
Context->GlobalNumericVariableTable[Name] = NumericVariable;
}
Optional<size_t> DefLineNumber = NumericVariable->getDefLineNumber();
if (DefLineNumber && LineNumber && *DefLineNumber == *LineNumber)
return FileCheckErrorDiagnostic::get(
SM, Name,
"numeric variable '" + Name +
"' defined earlier in the same CHECK directive");
return std::make_unique<FileCheckNumericVariableUse>(Name, NumericVariable);
}
Expected<std::unique_ptr<FileCheckExpressionAST>>
FileCheckPattern::parseNumericOperand(StringRef &Expr, AllowedOperand AO,
Optional<size_t> LineNumber,
FileCheckPatternContext *Context,
const SourceMgr &SM) {
if (AO == AllowedOperand::LineVar || AO == AllowedOperand::Any) {
// Try to parse as a numeric variable use.
Expected<FileCheckPattern::VariableProperties> ParseVarResult =
parseVariable(Expr, SM);
if (ParseVarResult)
return parseNumericVariableUse(ParseVarResult->Name,
ParseVarResult->IsPseudo, LineNumber,
Context, SM);
if (AO == AllowedOperand::LineVar)
return ParseVarResult.takeError();
// Ignore the error and retry parsing as a literal.
consumeError(ParseVarResult.takeError());
}
// Otherwise, parse it as a literal.
uint64_t LiteralValue;
if (!Expr.consumeInteger(/*Radix=*/10, LiteralValue))
return std::make_unique<FileCheckExpressionLiteral>(LiteralValue);
return FileCheckErrorDiagnostic::get(SM, Expr,
"invalid operand format '" + Expr + "'");
}
static uint64_t add(uint64_t LeftOp, uint64_t RightOp) {
return LeftOp + RightOp;
}
static uint64_t sub(uint64_t LeftOp, uint64_t RightOp) {
return LeftOp - RightOp;
}
Expected<std::unique_ptr<FileCheckExpressionAST>> FileCheckPattern::parseBinop(
StringRef &Expr, std::unique_ptr<FileCheckExpressionAST> LeftOp,
bool IsLegacyLineExpr, Optional<size_t> LineNumber,
FileCheckPatternContext *Context, const SourceMgr &SM) {
Expr = Expr.ltrim(SpaceChars);
if (Expr.empty())
return std::move(LeftOp);
// Check if this is a supported operation and select a function to perform
// it.
SMLoc OpLoc = SMLoc::getFromPointer(Expr.data());
char Operator = popFront(Expr);
binop_eval_t EvalBinop;
switch (Operator) {
case '+':
EvalBinop = add;
break;
case '-':
EvalBinop = sub;
break;
default:
return FileCheckErrorDiagnostic::get(
SM, OpLoc, Twine("unsupported operation '") + Twine(Operator) + "'");
}
// Parse right operand.
Expr = Expr.ltrim(SpaceChars);
if (Expr.empty())
return FileCheckErrorDiagnostic::get(SM, Expr,
"missing operand in expression");
// The second operand in a legacy @LINE expression is always a literal.
AllowedOperand AO =
IsLegacyLineExpr ? AllowedOperand::Literal : AllowedOperand::Any;
Expected<std::unique_ptr<FileCheckExpressionAST>> RightOpResult =
parseNumericOperand(Expr, AO, LineNumber, Context, SM);
if (!RightOpResult)
return RightOpResult;
Expr = Expr.ltrim(SpaceChars);
return std::make_unique<FileCheckASTBinop>(EvalBinop, std::move(LeftOp),
std::move(*RightOpResult));
}
Expected<std::unique_ptr<FileCheckExpressionAST>>
FileCheckPattern::parseNumericSubstitutionBlock(
StringRef Expr,
Optional<FileCheckNumericVariable *> &DefinedNumericVariable,
bool IsLegacyLineExpr, Optional<size_t> LineNumber,
FileCheckPatternContext *Context, const SourceMgr &SM) {
std::unique_ptr<FileCheckExpressionAST> ExpressionAST = nullptr;
StringRef DefExpr = StringRef();
DefinedNumericVariable = None;
// Save variable definition expression if any.
size_t DefEnd = Expr.find(':');
if (DefEnd != StringRef::npos) {
DefExpr = Expr.substr(0, DefEnd);
Expr = Expr.substr(DefEnd + 1);
}
// Parse the expression itself.
Expr = Expr.ltrim(SpaceChars);
if (!Expr.empty()) {
// The first operand in a legacy @LINE expression is always the @LINE
// pseudo variable.
AllowedOperand AO =
IsLegacyLineExpr ? AllowedOperand::LineVar : AllowedOperand::Any;
Expected<std::unique_ptr<FileCheckExpressionAST>> ParseResult =
parseNumericOperand(Expr, AO, LineNumber, Context, SM);
while (ParseResult && !Expr.empty()) {
ParseResult = parseBinop(Expr, std::move(*ParseResult), IsLegacyLineExpr,
LineNumber, Context, SM);
// Legacy @LINE expressions only allow 2 operands.
if (ParseResult && IsLegacyLineExpr && !Expr.empty())
return FileCheckErrorDiagnostic::get(
SM, Expr,
"unexpected characters at end of expression '" + Expr + "'");
}
if (!ParseResult)
return ParseResult;
ExpressionAST = std::move(*ParseResult);
}
// Parse the numeric variable definition.
if (DefEnd != StringRef::npos) {
DefExpr = DefExpr.ltrim(SpaceChars);
Expected<FileCheckNumericVariable *> ParseResult =
parseNumericVariableDefinition(DefExpr, Context, LineNumber, SM);
if (!ParseResult)
return ParseResult.takeError();
DefinedNumericVariable = *ParseResult;
}
return std::move(ExpressionAST);
}
bool FileCheckPattern::parsePattern(StringRef PatternStr, StringRef Prefix,
SourceMgr &SM,
const FileCheckRequest &Req) {
bool MatchFullLinesHere = Req.MatchFullLines && CheckTy != Check::CheckNot;
IgnoreCase = Req.IgnoreCase;
PatternLoc = SMLoc::getFromPointer(PatternStr.data());
if (!(Req.NoCanonicalizeWhiteSpace && Req.MatchFullLines))
// 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() && CheckTy != Check::CheckEmpty) {
SM.PrintMessage(PatternLoc, SourceMgr::DK_Error,
"found empty check string with prefix '" + Prefix + ":'");
return true;
}
if (!PatternStr.empty() && CheckTy == Check::CheckEmpty) {
SM.PrintMessage(
PatternLoc, SourceMgr::DK_Error,
"found non-empty check string for empty check with prefix '" + Prefix +
":'");
return true;
}
if (CheckTy == Check::CheckEmpty) {
RegExStr = "(\n$)";
return false;
}
// Check to see if this is a fixed string, or if it has regex pieces.
if (!MatchFullLinesHere &&
(PatternStr.size() < 2 || (PatternStr.find("{{") == StringRef::npos &&
PatternStr.find("[[") == StringRef::npos))) {
FixedStr = PatternStr;
return false;
}
if (MatchFullLinesHere) {
RegExStr += '^';
if (!Req.NoCanonicalizeWhiteSpace)
RegExStr += " *";
}
// 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;
}
// String and numeric substitution blocks. Pattern substitution blocks come
// in two forms: [[foo:.*]] and [[foo]]. The former matches .* (or some
// other regex) and assigns it to the string variable 'foo'. The latter
// substitutes foo's value. Numeric substitution blocks recognize the same
// form as string ones, but start with a '#' sign after the double
// brackets. They also accept a combined form which sets a numeric variable
// to the evaluation of an expression. Both string and numeric variable
// names must satisfy the regular expression "[a-zA-Z_][0-9a-zA-Z_]*" to be
// valid, as this helps catch some common errors.
if (PatternStr.startswith("[[")) {
StringRef UnparsedPatternStr = PatternStr.substr(2);
// 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(UnparsedPatternStr, SM);
StringRef MatchStr = UnparsedPatternStr.substr(0, End);
bool IsNumBlock = MatchStr.consume_front("#");
if (End == StringRef::npos) {
SM.PrintMessage(SMLoc::getFromPointer(PatternStr.data()),
SourceMgr::DK_Error,
"Invalid substitution block, no ]] found");
return true;
}
// Strip the substitution block we are parsing. End points to the start
// of the "]]" closing the expression so account for it in computing the
// index of the first unparsed character.
PatternStr = UnparsedPatternStr.substr(End + 2);
bool IsDefinition = false;
bool SubstNeeded = false;
// Whether the substitution block is a legacy use of @LINE with string
// substitution block syntax.
bool IsLegacyLineExpr = false;
StringRef DefName;
StringRef SubstStr;
StringRef MatchRegexp;
size_t SubstInsertIdx = RegExStr.size();
// Parse string variable or legacy @LINE expression.
if (!IsNumBlock) {
size_t VarEndIdx = MatchStr.find(":");
size_t SpacePos = MatchStr.substr(0, VarEndIdx).find_first_of(" \t");
if (SpacePos != StringRef::npos) {
SM.PrintMessage(SMLoc::getFromPointer(MatchStr.data() + SpacePos),
SourceMgr::DK_Error, "unexpected whitespace");
return true;
}
// Get the name (e.g. "foo") and verify it is well formed.
StringRef OrigMatchStr = MatchStr;
Expected<FileCheckPattern::VariableProperties> ParseVarResult =
parseVariable(MatchStr, SM);
if (!ParseVarResult) {
logAllUnhandledErrors(ParseVarResult.takeError(), errs());
return true;
}
StringRef Name = ParseVarResult->Name;
bool IsPseudo = ParseVarResult->IsPseudo;
IsDefinition = (VarEndIdx != StringRef::npos);
SubstNeeded = !IsDefinition;
if (IsDefinition) {
if ((IsPseudo || !MatchStr.consume_front(":"))) {
SM.PrintMessage(SMLoc::getFromPointer(Name.data()),
SourceMgr::DK_Error,
"invalid name in string variable definition");
return true;
}
// Detect collisions between string and numeric variables when the
// former is created later than the latter.
if (Context->GlobalNumericVariableTable.find(Name) !=
Context->GlobalNumericVariableTable.end()) {
SM.PrintMessage(
SMLoc::getFromPointer(Name.data()), SourceMgr::DK_Error,
"numeric variable with name '" + Name + "' already exists");
return true;
}
DefName = Name;
MatchRegexp = MatchStr;
} else {
if (IsPseudo) {
MatchStr = OrigMatchStr;
IsLegacyLineExpr = IsNumBlock = true;
} else
SubstStr = Name;
}
}
// Parse numeric substitution block.
std::unique_ptr<FileCheckExpressionAST> ExpressionAST;
Optional<FileCheckNumericVariable *> DefinedNumericVariable;
if (IsNumBlock) {
Expected<std::unique_ptr<FileCheckExpressionAST>> ParseResult =
parseNumericSubstitutionBlock(MatchStr, DefinedNumericVariable,
IsLegacyLineExpr, LineNumber, Context,
SM);
if (!ParseResult) {
logAllUnhandledErrors(ParseResult.takeError(), errs());
return true;
}
ExpressionAST = std::move(*ParseResult);
SubstNeeded = ExpressionAST != nullptr;
if (DefinedNumericVariable) {
IsDefinition = true;
DefName = (*DefinedNumericVariable)->getName();
}
if (SubstNeeded)
SubstStr = MatchStr;
else
MatchRegexp = "[0-9]+";
}
// Handle variable definition: [[<def>:(...)]] and [[#(...)<def>:(...)]].
if (IsDefinition) {
RegExStr += '(';
++SubstInsertIdx;
if (IsNumBlock) {
FileCheckNumericVariableMatch NumericVariableDefinition = {
*DefinedNumericVariable, CurParen};
NumericVariableDefs[DefName] = NumericVariableDefinition;
// This store is done here rather than in match() to allow
// parseNumericVariableUse() to get the pointer to the class instance
// of the right variable definition corresponding to a given numeric
// variable use.
Context->GlobalNumericVariableTable[DefName] =
*DefinedNumericVariable;
} else {
VariableDefs[DefName] = CurParen;
// Mark string variable as defined to detect collisions between
// string and numeric variables in parseNumericVariableUse() and
// defineCmdlineVariables() when the latter is created later than the
// former. We cannot reuse GlobalVariableTable for this by populating
// it with an empty string since we would then lose the ability to
// detect the use of an undefined variable in match().
Context->DefinedVariableTable[DefName] = true;
}
++CurParen;
}
if (!MatchRegexp.empty() && AddRegExToRegEx(MatchRegexp, CurParen, SM))
return true;
if (IsDefinition)
RegExStr += ')';
// Handle substitutions: [[foo]] and [[#<foo expr>]].
if (SubstNeeded) {
// Handle substitution of string variables that were defined earlier on
// the same line by emitting a backreference. Expressions do not
// support substituting a numeric variable defined on the same line.
if (!IsNumBlock && VariableDefs.find(SubstStr) != VariableDefs.end()) {
unsigned CaptureParenGroup = VariableDefs[SubstStr];
if (CaptureParenGroup < 1 || CaptureParenGroup > 9) {
SM.PrintMessage(SMLoc::getFromPointer(SubstStr.data()),
SourceMgr::DK_Error,
"Can't back-reference more than 9 variables");
return true;
}
AddBackrefToRegEx(CaptureParenGroup);
} else {
// Handle substitution of string variables ([[<var>]]) defined in
// previous CHECK patterns, and substitution of expressions.
FileCheckSubstitution *Substitution =
IsNumBlock
? Context->makeNumericSubstitution(
SubstStr, std::move(ExpressionAST), SubstInsertIdx)
: Context->makeStringSubstitution(SubstStr, SubstInsertIdx);
Substitutions.push_back(Substitution);
}
}
}
// 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);
}
if (MatchFullLinesHere) {
if (!Req.NoCanonicalizeWhiteSpace)
RegExStr += " *";
RegExStr += '$';
}
return false;
}
bool FileCheckPattern::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 FileCheckPattern::AddBackrefToRegEx(unsigned BackrefNum) {
assert(BackrefNum >= 1 && BackrefNum <= 9 && "Invalid backref number");
std::string Backref = std::string("\\") + std::string(1, '0' + BackrefNum);
RegExStr += Backref;
}
Expected<size_t> FileCheckPattern::match(StringRef Buffer, size_t &MatchLen,
const SourceMgr &SM) 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();
size_t Pos = IgnoreCase ? Buffer.find_lower(FixedStr)
: Buffer.find(FixedStr);
if (Pos == StringRef::npos)
return make_error<FileCheckNotFoundError>();
return Pos;
}
// Regex match.
// If there are substitutions, we need to create a temporary string with the
// actual value.
StringRef RegExToMatch = RegExStr;
std::string TmpStr;
if (!Substitutions.empty()) {
TmpStr = RegExStr;
if (LineNumber)
Context->LineVariable->setValue(*LineNumber);
size_t InsertOffset = 0;
// Substitute all string variables and expressions whose values are only
// now known. Use of string variables defined on the same line are handled
// by back-references.
for (const auto &Substitution : Substitutions) {
// Substitute and check for failure (e.g. use of undefined variable).
Expected<std::string> Value = Substitution->getResult();
if (!Value)
return Value.takeError();
// Plop it into the regex at the adjusted offset.
TmpStr.insert(TmpStr.begin() + Substitution->getIndex() + InsertOffset,
Value->begin(), Value->end());
InsertOffset += Value->size();
}
// Match the newly constructed regex.
RegExToMatch = TmpStr;
}
SmallVector<StringRef, 4> MatchInfo;
unsigned int Flags = Regex::Newline;
if (IgnoreCase)
Flags |= Regex::IgnoreCase;
if (!Regex(RegExToMatch, Flags).match(Buffer, &MatchInfo))
return make_error<FileCheckNotFoundError>();
// Successful regex match.
assert(!MatchInfo.empty() && "Didn't get any match");
StringRef FullMatch = MatchInfo[0];
// If this defines any string variables, remember their values.
for (const auto &VariableDef : VariableDefs) {
assert(VariableDef.second < MatchInfo.size() && "Internal paren error");
Context->GlobalVariableTable[VariableDef.first] =
MatchInfo[VariableDef.second];
}
// If this defines any numeric variables, remember their values.
for (const auto &NumericVariableDef : NumericVariableDefs) {
const FileCheckNumericVariableMatch &NumericVariableMatch =
NumericVariableDef.getValue();
unsigned CaptureParenGroup = NumericVariableMatch.CaptureParenGroup;
assert(CaptureParenGroup < MatchInfo.size() && "Internal paren error");
FileCheckNumericVariable *DefinedNumericVariable =
NumericVariableMatch.DefinedNumericVariable;
StringRef MatchedValue = MatchInfo[CaptureParenGroup];
uint64_t Val;
if (MatchedValue.getAsInteger(10, Val))
return FileCheckErrorDiagnostic::get(SM, MatchedValue,
"Unable to represent numeric value");
DefinedNumericVariable->setValue(Val);
}
// Like CHECK-NEXT, CHECK-EMPTY's match range is considered to start after
// the required preceding newline, which is consumed by the pattern in the
// case of CHECK-EMPTY but not CHECK-NEXT.
size_t MatchStartSkip = CheckTy == Check::CheckEmpty;
MatchLen = FullMatch.size() - MatchStartSkip;
return FullMatch.data() - Buffer.data() + MatchStartSkip;
}
unsigned FileCheckPattern::computeMatchDistance(StringRef Buffer) 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 FileCheckPattern::printSubstitutions(const SourceMgr &SM, StringRef Buffer,
SMRange MatchRange) const {
// Print what we know about substitutions.
if (!Substitutions.empty()) {
for (const auto &Substitution : Substitutions) {
SmallString<256> Msg;
raw_svector_ostream OS(Msg);
Expected<std::string> MatchedValue = Substitution->getResult();
// Substitution failed or is not known at match time, print the undefined
// variables it uses.
if (!MatchedValue) {
bool UndefSeen = false;
handleAllErrors(MatchedValue.takeError(),
[](const FileCheckNotFoundError &E) {},
// Handled in PrintNoMatch().
[](const FileCheckErrorDiagnostic &E) {},
[&](const FileCheckUndefVarError &E) {
if (!UndefSeen) {
OS << "uses undefined variable(s):";
UndefSeen = true;
}
OS << " ";
E.log(OS);
});
} else {
// Substitution succeeded. Print substituted value.
OS << "with \"";
OS.write_escaped(Substitution->getFromString()) << "\" equal to \"";
OS.write_escaped(*MatchedValue) << "\"";
}
if (MatchRange.isValid())
SM.PrintMessage(MatchRange.Start, SourceMgr::DK_Note, OS.str(),
{MatchRange});
else
SM.PrintMessage(SMLoc::getFromPointer(Buffer.data()),
SourceMgr::DK_Note, OS.str());
}
}
}
static SMRange ProcessMatchResult(FileCheckDiag::MatchType MatchTy,
const SourceMgr &SM, SMLoc Loc,
Check::FileCheckType CheckTy,
StringRef Buffer, size_t Pos, size_t Len,
std::vector<FileCheckDiag> *Diags,
bool AdjustPrevDiag = false) {
SMLoc Start = SMLoc::getFromPointer(Buffer.data() + Pos);
SMLoc End = SMLoc::getFromPointer(Buffer.data() + Pos + Len);
SMRange Range(Start, End);
if (Diags) {
if (AdjustPrevDiag)
Diags->rbegin()->MatchTy = MatchTy;
else
Diags->emplace_back(SM, CheckTy, Loc, MatchTy, Range);
}
return Range;
}
void FileCheckPattern::printFuzzyMatch(
const SourceMgr &SM, StringRef Buffer,
std::vector<FileCheckDiag> *Diags) const {
// 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));
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) {
SMRange MatchRange =
ProcessMatchResult(FileCheckDiag::MatchFuzzy, SM, getLoc(),
getCheckTy(), Buffer, Best, 0, Diags);
SM.PrintMessage(MatchRange.Start, 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.
}
}
Expected<StringRef>
FileCheckPatternContext::getPatternVarValue(StringRef VarName) {
auto VarIter = GlobalVariableTable.find(VarName);
if (VarIter == GlobalVariableTable.end())
return make_error<FileCheckUndefVarError>(VarName);
return VarIter->second;
}
template <class... Types>
FileCheckNumericVariable *
FileCheckPatternContext::makeNumericVariable(Types... args) {
NumericVariables.push_back(
std::make_unique<FileCheckNumericVariable>(args...));
return NumericVariables.back().get();
}
FileCheckSubstitution *
FileCheckPatternContext::makeStringSubstitution(StringRef VarName,
size_t InsertIdx) {
Substitutions.push_back(
std::make_unique<FileCheckStringSubstitution>(this, VarName, InsertIdx));
return Substitutions.back().get();
}
FileCheckSubstitution *FileCheckPatternContext::makeNumericSubstitution(
StringRef ExpressionStr,
std::unique_ptr<FileCheckExpressionAST> ExpressionAST, size_t InsertIdx) {
Substitutions.push_back(std::make_unique<FileCheckNumericSubstitution>(
this, ExpressionStr, std::move(ExpressionAST), InsertIdx));
return Substitutions.back().get();
}
size_t FileCheckPattern::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;
}
StringRef FileCheck::CanonicalizeFile(MemoryBuffer &MB,
SmallVectorImpl<char> &OutputBuffer) {
OutputBuffer.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 (Req.NoCanonicalizeWhiteSpace || (*Ptr != ' ' && *Ptr != '\t')) {
OutputBuffer.push_back(*Ptr);
continue;
}
// Otherwise, add one space and advance over neighboring space.
OutputBuffer.push_back(' ');
while (Ptr + 1 != End && (Ptr[1] == ' ' || Ptr[1] == '\t'))
++Ptr;
}
// Add a null byte and then return all but that byte.
OutputBuffer.push_back('\0');
return StringRef(OutputBuffer.data(), OutputBuffer.size() - 1);
}
FileCheckDiag::FileCheckDiag(const SourceMgr &SM,
const Check::FileCheckType &CheckTy,
SMLoc CheckLoc, MatchType MatchTy,
SMRange InputRange)
: CheckTy(CheckTy), MatchTy(MatchTy) {
auto Start = SM.getLineAndColumn(InputRange.Start);
auto End = SM.getLineAndColumn(InputRange.End);
InputStartLine = Start.first;
InputStartCol = Start.second;
InputEndLine = End.first;
InputEndCol = End.second;
Start = SM.getLineAndColumn(CheckLoc);
CheckLine = Start.first;
CheckCol = Start.second;
}
static bool IsPartOfWord(char c) {
return (isalnum(c) || c == '-' || c == '_');
}
Check::FileCheckType &Check::FileCheckType::setCount(int C) {
assert(Count > 0 && "zero and negative counts are not supported");
assert((C == 1 || Kind == CheckPlain) &&
"count supported only for plain CHECK directives");
Count = C;
return *this;
}
std::string Check::FileCheckType::getDescription(StringRef Prefix) const {
switch (Kind) {
case Check::CheckNone:
return "invalid";
case Check::CheckPlain:
if (Count > 1)
return Prefix.str() + "-COUNT";
return Prefix;
case Check::CheckNext:
return Prefix.str() + "-NEXT";
case Check::CheckSame:
return Prefix.str() + "-SAME";
case Check::CheckNot:
return Prefix.str() + "-NOT";
case Check::CheckDAG:
return Prefix.str() + "-DAG";
case Check::CheckLabel:
return Prefix.str() + "-LABEL";
case Check::CheckEmpty:
return Prefix.str() + "-EMPTY";
case Check::CheckEOF:
return "implicit EOF";
case Check::CheckBadNot:
return "bad NOT";
case Check::CheckBadCount:
return "bad COUNT";
}
llvm_unreachable("unknown FileCheckType");
}
static std::pair<Check::FileCheckType, StringRef>
FindCheckType(StringRef Buffer, StringRef Prefix) {
if (Buffer.size() <= Prefix.size())
return {Check::CheckNone, StringRef()};
char NextChar = Buffer[Prefix.size()];
StringRef Rest = Buffer.drop_front(Prefix.size() + 1);
// Verify that the : is present after the prefix.
if (NextChar == ':')
return {Check::CheckPlain, Rest};
if (NextChar != '-')
return {Check::CheckNone, StringRef()};
if (Rest.consume_front("COUNT-")) {
int64_t Count;
if (Rest.consumeInteger(10, Count))
// Error happened in parsing integer.
return {Check::CheckBadCount, Rest};
if (Count <= 0 || Count > INT32_MAX)
return {Check::CheckBadCount, Rest};
if (!Rest.consume_front(":"))
return {Check::CheckBadCount, Rest};
return {Check::FileCheckType(Check::CheckPlain).setCount(Count), Rest};
}
if (Rest.consume_front("NEXT:"))
return {Check::CheckNext, Rest};
if (Rest.consume_front("SAME:"))
return {Check::CheckSame, Rest};
if (Rest.consume_front("NOT:"))
return {Check::CheckNot, Rest};
if (Rest.consume_front("DAG:"))
return {Check::CheckDAG, Rest};
if (Rest.consume_front("LABEL:"))
return {Check::CheckLabel, Rest};
if (Rest.consume_front("EMPTY:"))
return {Check::CheckEmpty, Rest};
// You can't combine -NOT with another suffix.
if (Rest.startswith("DAG-NOT:") || Rest.startswith("NOT-DAG:") ||
Rest.startswith("NEXT-NOT:") || Rest.startswith("NOT-NEXT:") ||
Rest.startswith("SAME-NOT:") || Rest.startswith("NOT-SAME:") ||
Rest.startswith("EMPTY-NOT:") || Rest.startswith("NOT-EMPTY:"))
return {Check::CheckBadNot, Rest};
return {Check::CheckNone, Rest};
}
// 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;
}
/// Searches the buffer for the first prefix in the prefix regular expression.
///
/// This searches the buffer using the provided regular expression, however it
/// enforces constraints beyond that:
/// 1) The found prefix must not be a suffix of something that looks like
/// a valid prefix.
/// 2) The found prefix must be followed by a valid check type suffix using \c
/// FindCheckType above.
///
/// \returns a pair of StringRefs into the Buffer, which combines:
/// - the first match of the regular expression to satisfy these two is
/// returned,
/// otherwise an empty StringRef is returned to indicate failure.
/// - buffer rewound to the location right after parsed suffix, for parsing
/// to continue from
///
/// If this routine returns a valid prefix, it will also shrink \p Buffer to
/// start at the beginning of the returned prefix, increment \p LineNumber for
/// each new line consumed from \p Buffer, and set \p CheckTy to the type of
/// check found by examining the suffix.
///
/// If no valid prefix is found, the state of Buffer, LineNumber, and CheckTy
/// is unspecified.
static std::pair<StringRef, StringRef>
FindFirstMatchingPrefix(Regex &PrefixRE, StringRef &Buffer,
unsigned &LineNumber, Check::FileCheckType &CheckTy) {
SmallVector<StringRef, 2> Matches;
while (!Buffer.empty()) {
// Find the first (longest) match using the RE.
if (!PrefixRE.match(Buffer, &Matches))
// No match at all, bail.
return {StringRef(), StringRef()};
StringRef Prefix = Matches[0];
Matches.clear();
assert(Prefix.data() >= Buffer.data() &&
Prefix.data() < Buffer.data() + Buffer.size() &&
"Prefix doesn't start inside of buffer!");
size_t Loc = Prefix.data() - Buffer.data();
StringRef Skipped = Buffer.substr(0, Loc);
Buffer = Buffer.drop_front(Loc);
LineNumber += Skipped.count('\n');
// Check that the matched prefix isn't a suffix of some other check-like
// word.
// FIXME: This is a very ad-hoc check. it would be better handled in some
// other way. Among other things it seems hard to distinguish between
// intentional and unintentional uses of this feature.
if (Skipped.empty() || !IsPartOfWord(Skipped.back())) {
// Now extract the type.
StringRef AfterSuffix;
std::tie(CheckTy, AfterSuffix) = FindCheckType(Buffer, Prefix);
// If we've found a valid check type for this prefix, we're done.
if (CheckTy != Check::CheckNone)
return {Prefix, AfterSuffix};
}
// If we didn't successfully find a prefix, we need to skip this invalid
// prefix and continue scanning. We directly skip the prefix that was
// matched and any additional parts of that check-like word.
Buffer = Buffer.drop_front(SkipWord(Buffer, Prefix.size()));
}
// We ran out of buffer while skipping partial matches so give up.
return {StringRef(), StringRef()};
}
void FileCheckPatternContext::createLineVariable() {
assert(!LineVariable && "@LINE pseudo numeric variable already created");
StringRef LineName = "@LINE";
LineVariable = makeNumericVariable(LineName);
GlobalNumericVariableTable[LineName] = LineVariable;
}
FileCheck::FileCheck(FileCheckRequest Req)
: Req(Req), PatternContext(std::make_unique<FileCheckPatternContext>()),
CheckStrings(std::make_unique<std::vector<FileCheckString>>()) {}
FileCheck::~FileCheck() = default;
bool FileCheck::readCheckFile(SourceMgr &SM, StringRef Buffer,
Regex &PrefixRE) {
Error DefineError =
PatternContext->defineCmdlineVariables(Req.GlobalDefines, SM);
if (DefineError) {
logAllUnhandledErrors(std::move(DefineError), errs());
return true;
}
PatternContext->createLineVariable();
std::vector<FileCheckPattern> ImplicitNegativeChecks;
for (const auto &PatternString : Req.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 = "-implicit-check-not='";
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(
FileCheckPattern(Check::CheckNot, PatternContext.get()));
ImplicitNegativeChecks.back().parsePattern(PatternInBuffer,
"IMPLICIT-CHECK", SM, Req);
}
std::vector<FileCheckPattern> DagNotMatches = ImplicitNegativeChecks;
// LineNumber keeps track of the line on which CheckPrefix instances are
// found.
unsigned LineNumber = 1;
while (1) {
Check::FileCheckType CheckTy;
// See if a prefix occurs in the memory buffer.
StringRef UsedPrefix;
StringRef AfterSuffix;
std::tie(UsedPrefix, AfterSuffix) =
FindFirstMatchingPrefix(PrefixRE, Buffer, LineNumber, CheckTy);
if (UsedPrefix.empty())
break;
assert(UsedPrefix.data() == Buffer.data() &&
"Failed to move Buffer's start forward, or pointed prefix outside "
"of the buffer!");
assert(AfterSuffix.data() >= Buffer.data() &&
AfterSuffix.data() < Buffer.data() + Buffer.size() &&
"Parsing after suffix doesn't start inside of buffer!");
// Location to use for error messages.
const char *UsedPrefixStart = UsedPrefix.data();
// Skip the buffer to the end of parsed suffix (or just prefix, if no good
// suffix was processed).
Buffer = AfterSuffix.empty() ? Buffer.drop_front(UsedPrefix.size())
: AfterSuffix;
// Complain about useful-looking but unsupported suffixes.
if (CheckTy == Check::CheckBadNot) {
SM.PrintMessage(SMLoc::getFromPointer(Buffer.data()), SourceMgr::DK_Error,
"unsupported -NOT combo on prefix '" + UsedPrefix + "'");
return true;
}
// Complain about invalid count specification.
if (CheckTy == Check::CheckBadCount) {
SM.PrintMessage(SMLoc::getFromPointer(Buffer.data()), SourceMgr::DK_Error,
"invalid count in -COUNT specification on prefix '" +
UsedPrefix + "'");
return true;
}
// Okay, we found the prefix, yay. Remember the rest of the line, but ignore
// leading whitespace.
if (!(Req.NoCanonicalizeWhiteSpace && Req.MatchFullLines))
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.
FileCheckPattern P(CheckTy, PatternContext.get(), LineNumber);
if (P.parsePattern(Buffer.substr(0, EOL), UsedPrefix, SM, Req))
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/SAME/EMPTY lines have at least one CHECK line before them.
if ((CheckTy == Check::CheckNext || CheckTy == Check::CheckSame ||
CheckTy == Check::CheckEmpty) &&
CheckStrings->empty()) {
StringRef Type = CheckTy == Check::CheckNext
? "NEXT"
: CheckTy == Check::CheckEmpty ? "EMPTY" : "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);
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(
FileCheckPattern(Check::CheckEOF, PatternContext.get(), LineNumber + 1),
*Req.CheckPrefixes.begin(), SMLoc::getFromPointer(Buffer.data()));
std::swap(DagNotMatches, CheckStrings->back().DagNotStrings);
}
if (CheckStrings->empty()) {
errs() << "error: no check strings found with prefix"
<< (Req.CheckPrefixes.size() > 1 ? "es " : " ");
auto I = Req.CheckPrefixes.begin();
auto E = Req.CheckPrefixes.end();
if (I != E) {
errs() << "\'" << *I << ":'";
++I;
}
for (; I != E; ++I)
errs() << ", \'" << *I << ":'";
errs() << '\n';
return true;
}
return false;
}
static void PrintMatch(bool ExpectedMatch, const SourceMgr &SM,
StringRef Prefix, SMLoc Loc, const FileCheckPattern &Pat,
int MatchedCount, StringRef Buffer, size_t MatchPos,
size_t MatchLen, const FileCheckRequest &Req,
std::vector<FileCheckDiag> *Diags) {
bool PrintDiag = true;
if (ExpectedMatch) {
if (!Req.Verbose)
return;
if (!Req.VerboseVerbose && Pat.getCheckTy() == Check::CheckEOF)
return;
// Due to their verbosity, we don't print verbose diagnostics here if we're
// gathering them for a different rendering, but we always print other
// diagnostics.
PrintDiag = !Diags;
}
SMRange MatchRange = ProcessMatchResult(
ExpectedMatch ? FileCheckDiag::MatchFoundAndExpected
: FileCheckDiag::MatchFoundButExcluded,
SM, Loc, Pat.getCheckTy(), Buffer, MatchPos, MatchLen, Diags);
if (!PrintDiag)
return;
std::string Message = formatv("{0}: {1} string found in input",
Pat.getCheckTy().getDescription(Prefix),
(ExpectedMatch ? "expected" : "excluded"))
.str();
if (Pat.getCount() > 1)
Message += formatv(" ({0} out of {1})", MatchedCount, Pat.getCount()).str();
SM.PrintMessage(
Loc, ExpectedMatch ? SourceMgr::DK_Remark : SourceMgr::DK_Error, Message);
SM.PrintMessage(MatchRange.Start, SourceMgr::DK_Note, "found here",
{MatchRange});
Pat.printSubstitutions(SM, Buffer, MatchRange);
}
static void PrintMatch(bool ExpectedMatch, const SourceMgr &SM,
const FileCheckString &CheckStr, int MatchedCount,
StringRef Buffer, size_t MatchPos, size_t MatchLen,
FileCheckRequest &Req,
std::vector<FileCheckDiag> *Diags) {
PrintMatch(ExpectedMatch, SM, CheckStr.Prefix, CheckStr.Loc, CheckStr.Pat,
MatchedCount, Buffer, MatchPos, MatchLen, Req, Diags);
}
static void PrintNoMatch(bool ExpectedMatch, const SourceMgr &SM,
StringRef Prefix, SMLoc Loc,
const FileCheckPattern &Pat, int MatchedCount,
StringRef Buffer, bool VerboseVerbose,
std::vector<FileCheckDiag> *Diags, Error MatchErrors) {
assert(MatchErrors && "Called on successful match");
bool PrintDiag = true;
if (!ExpectedMatch) {
if (!VerboseVerbose) {
consumeError(std::move(MatchErrors));
return;
}
// Due to their verbosity, we don't print verbose diagnostics here if we're
// gathering them for a different rendering, but we always print other
// diagnostics.
PrintDiag = !Diags;
}
// 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"));
SMRange SearchRange = ProcessMatchResult(
ExpectedMatch ? FileCheckDiag::MatchNoneButExpected
: FileCheckDiag::MatchNoneAndExcluded,
SM, Loc, Pat.getCheckTy(), Buffer, 0, Buffer.size(), Diags);
if (!PrintDiag) {
consumeError(std::move(MatchErrors));
return;
}
MatchErrors =
handleErrors(std::move(MatchErrors),
[](const FileCheckErrorDiagnostic &E) { E.log(errs()); });
// No problem matching the string per se.
if (!MatchErrors)
return;
consumeError(std::move(MatchErrors));
// Print "not found" diagnostic.
std::string Message = formatv("{0}: {1} string not found in input",
Pat.getCheckTy().getDescription(Prefix),
(ExpectedMatch ? "expected" : "excluded"))
.str();
if (Pat.getCount() > 1)
Message += formatv(" ({0} out of {1})", MatchedCount, Pat.getCount()).str();
SM.PrintMessage(
Loc, ExpectedMatch ? SourceMgr::DK_Error : SourceMgr::DK_Remark, Message);
// Print the "scanning from here" line.
SM.PrintMessage(SearchRange.Start, SourceMgr::DK_Note, "scanning from here");
// Allow the pattern to print additional information if desired.
Pat.printSubstitutions(SM, Buffer);
if (ExpectedMatch)
Pat.printFuzzyMatch(SM, Buffer, Diags);
}
static void PrintNoMatch(bool ExpectedMatch, const SourceMgr &SM,
const FileCheckString &CheckStr, int MatchedCount,
StringRef Buffer, bool VerboseVerbose,
std::vector<FileCheckDiag> *Diags, Error MatchErrors) {
PrintNoMatch(ExpectedMatch, SM, CheckStr.Prefix, CheckStr.Loc, CheckStr.Pat,
MatchedCount, Buffer, VerboseVerbose, Diags,
std::move(MatchErrors));
}
/// Counts 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 FileCheckString::Check(const SourceMgr &SM, StringRef Buffer,
bool IsLabelScanMode, size_t &MatchLen,
FileCheckRequest &Req,
std::vector<FileCheckDiag> *Diags) const {
size_t LastPos = 0;
std::vector<const FileCheckPattern *> 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, Req, Diags);
if (LastPos == StringRef::npos)
return StringRef::npos;
}
// Match itself from the last position after matching CHECK-DAG.
size_t LastMatchEnd = LastPos;
size_t FirstMatchPos = 0;
// Go match the pattern Count times. Majority of patterns only match with
// count 1 though.
assert(Pat.getCount() != 0 && "pattern count can not be zero");
for (int i = 1; i <= Pat.getCount(); i++) {
StringRef MatchBuffer = Buffer.substr(LastMatchEnd);
size_t CurrentMatchLen;
// get a match at current start point
Expected<size_t> MatchResult = Pat.match(MatchBuffer, CurrentMatchLen, SM);
// report
if (!MatchResult) {
PrintNoMatch(true, SM, *this, i, MatchBuffer, Req.VerboseVerbose, Diags,
MatchResult.takeError());
return StringRef::npos;
}
size_t MatchPos = *MatchResult;
PrintMatch(true, SM, *this, i, MatchBuffer, MatchPos, CurrentMatchLen, Req,
Diags);
if (i == 1)
FirstMatchPos = LastPos + MatchPos;
// move start point after the match
LastMatchEnd += MatchPos + CurrentMatchLen;
}
// Full match len counts from first match pos.
MatchLen = LastMatchEnd - FirstMatchPos;
// Similar to the above, in "label-scan mode" we can't yet handle CHECK-NEXT
// or CHECK-NOT
if (!IsLabelScanMode) {
size_t MatchPos = FirstMatchPos - LastPos;
StringRef MatchBuffer = Buffer.substr(LastPos);
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)) {
ProcessMatchResult(FileCheckDiag::MatchFoundButWrongLine, SM, Loc,
Pat.getCheckTy(), MatchBuffer, MatchPos, MatchLen,
Diags, Req.Verbose);
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)) {
ProcessMatchResult(FileCheckDiag::MatchFoundButWrongLine, SM, Loc,
Pat.getCheckTy(), MatchBuffer, MatchPos, MatchLen,
Diags, Req.Verbose);
return StringRef::npos;
}
// If this match had "not strings", verify that they don't exist in the
// skipped region.
if (CheckNot(SM, SkippedRegion, NotStrings, Req, Diags))
return StringRef::npos;
}
return FirstMatchPos;
}
bool FileCheckString::CheckNext(const SourceMgr &SM, StringRef Buffer) const {
if (Pat.getCheckTy() != Check::CheckNext &&
Pat.getCheckTy() != Check::CheckEmpty)
return false;
Twine CheckName =
Prefix +
Twine(Pat.getCheckTy() == Check::CheckEmpty ? "-EMPTY" : "-NEXT");
// Count the number of newlines between the previous match and this one.
const char *FirstNewLine = nullptr;
unsigned NumNewLines = CountNumNewlinesBetween(Buffer, FirstNewLine);
if (NumNewLines == 0) {
SM.PrintMessage(Loc, SourceMgr::DK_Error,
CheckName + ": 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,
CheckName +
": 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 FileCheckString::CheckSame(const SourceMgr &SM, StringRef Buffer) const {
if (Pat.getCheckTy() != Check::CheckSame)
return false;
// Count the number of newlines between the previous match and this one.
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 FileCheckString::CheckNot(
const SourceMgr &SM, StringRef Buffer,
const std::vector<const FileCheckPattern *> &NotStrings,
const FileCheckRequest &Req, std::vector<FileCheckDiag> *Diags) const {
for (const FileCheckPattern *Pat : NotStrings) {
assert((Pat->getCheckTy() == Check::CheckNot) && "Expect CHECK-NOT!");
size_t MatchLen = 0;
Expected<size_t> MatchResult = Pat->match(Buffer, MatchLen, SM);
if (!MatchResult) {
PrintNoMatch(false, SM, Prefix, Pat->getLoc(), *Pat, 1, Buffer,
Req.VerboseVerbose, Diags, MatchResult.takeError());
continue;
}
size_t Pos = *MatchResult;
PrintMatch(false, SM, Prefix, Pat->getLoc(), *Pat, 1, Buffer, Pos, MatchLen,
Req, Diags);
return true;
}
return false;
}
size_t
FileCheckString::CheckDag(const SourceMgr &SM, StringRef Buffer,
std::vector<const FileCheckPattern *> &NotStrings,
const FileCheckRequest &Req,
std::vector<FileCheckDiag> *Diags) const {
if (DagNotStrings.empty())
return 0;
// The start of the search range.
size_t StartPos = 0;
struct MatchRange {
size_t Pos;
size_t End;
};
// A sorted list of ranges for non-overlapping CHECK-DAG matches. Match
// ranges are erased from this list once they are no longer in the search
// range.
std::list<MatchRange> MatchRanges;
// We need PatItr and PatEnd later for detecting the end of a CHECK-DAG
// group, so we don't use a range-based for loop here.
for (auto PatItr = DagNotStrings.begin(), PatEnd = DagNotStrings.end();
PatItr != PatEnd; ++PatItr) {
const FileCheckPattern &Pat = *PatItr;
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!");
// CHECK-DAG always matches from the start.
size_t MatchLen = 0, MatchPos = StartPos;
// Search for a match that doesn't overlap a previous match in this
// CHECK-DAG group.
for (auto MI = MatchRanges.begin(), ME = MatchRanges.end(); true; ++MI) {
StringRef MatchBuffer = Buffer.substr(MatchPos);
Expected<size_t> MatchResult = Pat.match(MatchBuffer, MatchLen, SM);
// With a group of CHECK-DAGs, a single mismatching means the match on
// that group of CHECK-DAGs fails immediately.
if (!MatchResult) {
PrintNoMatch(true, SM, Prefix, Pat.getLoc(), Pat, 1, MatchBuffer,
Req.VerboseVerbose, Diags, MatchResult.takeError());
return StringRef::npos;
}
size_t MatchPosBuf = *MatchResult;
// Re-calc it as the offset relative to the start of the original string.
MatchPos += MatchPosBuf;
if (Req.VerboseVerbose)
PrintMatch(true, SM, Prefix, Pat.getLoc(), Pat, 1, Buffer, MatchPos,
MatchLen, Req, Diags);
MatchRange M{MatchPos, MatchPos + MatchLen};
if (Req.AllowDeprecatedDagOverlap) {
// We don't need to track all matches in this mode, so we just maintain
// one match range that encompasses the current CHECK-DAG group's
// matches.
if (MatchRanges.empty())
MatchRanges.insert(MatchRanges.end(), M);
else {
auto Block = MatchRanges.begin();
Block->Pos = std::min(Block->Pos, M.Pos);
Block->End = std::max(Block->End, M.End);
}
break;
}
// Iterate previous matches until overlapping match or insertion point.
bool Overlap = false;
for (; MI != ME; ++MI) {
if (M.Pos < MI->End) {
// !Overlap => New match has no overlap and is before this old match.
// Overlap => New match overlaps this old match.
Overlap = MI->Pos < M.End;
break;
}
}
if (!Overlap) {
// Insert non-overlapping match into list.
MatchRanges.insert(MI, M);
break;
}
if (Req.VerboseVerbose) {
// Due to their verbosity, we don't print verbose diagnostics here if
// we're gathering them for a different rendering, but we always print
// other diagnostics.
if (!Diags) {
SMLoc OldStart = SMLoc::getFromPointer(Buffer.data() + MI->Pos);
SMLoc OldEnd = SMLoc::getFromPointer(Buffer.data() + MI->End);
SMRange OldRange(OldStart, OldEnd);
SM.PrintMessage(OldStart, SourceMgr::DK_Note,
"match discarded, overlaps earlier DAG match here",
{OldRange});
} else
Diags->rbegin()->MatchTy = FileCheckDiag::MatchFoundButDiscarded;
}
MatchPos = MI->End;
}
if (!Req.VerboseVerbose)
PrintMatch(true, SM, Prefix, Pat.getLoc(), Pat, 1, Buffer, MatchPos,
MatchLen, Req, Diags);
// Handle the end of a CHECK-DAG group.
if (std::next(PatItr) == PatEnd ||
std::next(PatItr)->getCheckTy() == Check::CheckNot) {
if (!NotStrings.empty()) {
// If there are CHECK-NOTs between two CHECK-DAGs or from CHECK to
// CHECK-DAG, verify that there are no 'not' strings occurred in that
// region.
StringRef SkippedRegion =
Buffer.slice(StartPos, MatchRanges.begin()->Pos);
if (CheckNot(SM, SkippedRegion, NotStrings, Req, Diags))
return StringRef::npos;
// Clear "not strings".
NotStrings.clear();
}
// All subsequent CHECK-DAGs and CHECK-NOTs should be matched from the
// end of this CHECK-DAG group's match range.
StartPos = MatchRanges.rbegin()->End;
// Don't waste time checking for (impossible) overlaps before that.
MatchRanges.clear();
}
}
return StartPos;
}
// A check prefix must contain only alphanumeric, hyphens and underscores.
static bool ValidateCheckPrefix(StringRef CheckPrefix) {
static const Regex Validator("^[a-zA-Z0-9_-]*$");
return Validator.match(CheckPrefix);
}
bool FileCheck::ValidateCheckPrefixes() {
StringSet<> PrefixSet;
for (StringRef Prefix : Req.CheckPrefixes) {
// Reject empty prefixes.
if (Prefix == "")
return false;
if (!PrefixSet.insert(Prefix).second)
return false;
if (!ValidateCheckPrefix(Prefix))
return false;
}
return true;
}
Regex FileCheck::buildCheckPrefixRegex() {
// I don't think there's a way to specify an initial value for cl::list,
// so if nothing was specified, add the default
if (Req.CheckPrefixes.empty())
Req.CheckPrefixes.push_back("CHECK");
// We already validated the contents of CheckPrefixes so just concatenate
// them as alternatives.
SmallString<32> PrefixRegexStr;
for (StringRef Prefix : Req.CheckPrefixes) {
if (Prefix != Req.CheckPrefixes.front())
PrefixRegexStr.push_back('|');
PrefixRegexStr.append(Prefix);
}
return Regex(PrefixRegexStr);
}
Error FileCheckPatternContext::defineCmdlineVariables(
std::vector<std::string> &CmdlineDefines, SourceMgr &SM) {
assert(GlobalVariableTable.empty() && GlobalNumericVariableTable.empty() &&
"Overriding defined variable with command-line variable definitions");
if (CmdlineDefines.empty())
return Error::success();
// Create a string representing the vector of command-line definitions. Each
// definition is on its own line and prefixed with a definition number to
// clarify which definition a given diagnostic corresponds to.
unsigned I = 0;
Error Errs = Error::success();
std::string CmdlineDefsDiag;
SmallVector<std::pair<size_t, size_t>, 4> CmdlineDefsIndices;
for (StringRef CmdlineDef : CmdlineDefines) {
std::string DefPrefix = ("Global define #" + Twine(++I) + ": ").str();
size_t EqIdx = CmdlineDef.find('=');
if (EqIdx == StringRef::npos) {
CmdlineDefsIndices.push_back(std::make_pair(CmdlineDefsDiag.size(), 0));
continue;
}
// Numeric variable definition.
if (CmdlineDef[0] == '#') {
// Append a copy of the command-line definition adapted to use the same
// format as in the input file to be able to reuse
// parseNumericSubstitutionBlock.
CmdlineDefsDiag += (DefPrefix + CmdlineDef + " (parsed as: [[").str();
std::string SubstitutionStr = CmdlineDef;
SubstitutionStr[EqIdx] = ':';
CmdlineDefsIndices.push_back(
std::make_pair(CmdlineDefsDiag.size(), SubstitutionStr.size()));
CmdlineDefsDiag += (SubstitutionStr + Twine("]])\n")).str();
} else {
CmdlineDefsDiag += DefPrefix;
CmdlineDefsIndices.push_back(
std::make_pair(CmdlineDefsDiag.size(), CmdlineDef.size()));
CmdlineDefsDiag += (CmdlineDef + "\n").str();
}
}
// Create a buffer with fake command line content in order to display
// parsing diagnostic with location information and point to the
// global definition with invalid syntax.
std::unique_ptr<MemoryBuffer> CmdLineDefsDiagBuffer =
MemoryBuffer::getMemBufferCopy(CmdlineDefsDiag, "Global defines");
StringRef CmdlineDefsDiagRef = CmdLineDefsDiagBuffer->getBuffer();
SM.AddNewSourceBuffer(std::move(CmdLineDefsDiagBuffer), SMLoc());
for (std::pair<size_t, size_t> CmdlineDefIndices : CmdlineDefsIndices) {
StringRef CmdlineDef = CmdlineDefsDiagRef.substr(CmdlineDefIndices.first,
CmdlineDefIndices.second);
if (CmdlineDef.empty()) {
Errs = joinErrors(
std::move(Errs),
FileCheckErrorDiagnostic::get(
SM, CmdlineDef, "missing equal sign in global definition"));
continue;
}
// Numeric variable definition.
if (CmdlineDef[0] == '#') {
// Now parse the definition both to check that the syntax is correct and
// to create the necessary class instance.
StringRef CmdlineDefExpr = CmdlineDef.substr(1);
Optional<FileCheckNumericVariable *> DefinedNumericVariable;
Expected<std::unique_ptr<FileCheckExpressionAST>> ExpressionASTResult =
FileCheckPattern::parseNumericSubstitutionBlock(
CmdlineDefExpr, DefinedNumericVariable, false, None, this, SM);
if (!ExpressionASTResult) {
Errs = joinErrors(std::move(Errs), ExpressionASTResult.takeError());
continue;
}
std::unique_ptr<FileCheckExpressionAST> ExpressionAST =
std::move(*ExpressionASTResult);
// Now evaluate the expression whose value this variable should be set
// to, since the expression of a command-line variable definition should
// only use variables defined earlier on the command-line. If not, this
// is an error and we report it.
Expected<uint64_t> Value = ExpressionAST->eval();
if (!Value) {
Errs = joinErrors(std::move(Errs), Value.takeError());
continue;
}
assert(DefinedNumericVariable && "No variable defined");
(*DefinedNumericVariable)->setValue(*Value);
// Record this variable definition.
GlobalNumericVariableTable[(*DefinedNumericVariable)->getName()] =
*DefinedNumericVariable;
} else {
// String variable definition.
std::pair<StringRef, StringRef> CmdlineNameVal = CmdlineDef.split('=');
StringRef CmdlineName = CmdlineNameVal.first;
StringRef OrigCmdlineName = CmdlineName;
Expected<FileCheckPattern::VariableProperties> ParseVarResult =
FileCheckPattern::parseVariable(CmdlineName, SM);
if (!ParseVarResult) {
Errs = joinErrors(std::move(Errs), ParseVarResult.takeError());
continue;
}
// Check that CmdlineName does not denote a pseudo variable is only
// composed of the parsed numeric variable. This catches cases like
// "FOO+2" in a "FOO+2=10" definition.
if (ParseVarResult->IsPseudo || !CmdlineName.empty()) {
Errs = joinErrors(std::move(Errs),
FileCheckErrorDiagnostic::get(
SM, OrigCmdlineName,
"invalid name in string variable definition '" +
OrigCmdlineName + "'"));
continue;
}
StringRef Name = ParseVarResult->Name;
// Detect collisions between string and numeric variables when the former
// is created later than the latter.
if (GlobalNumericVariableTable.find(Name) !=
GlobalNumericVariableTable.end()) {
Errs = joinErrors(std::move(Errs), FileCheckErrorDiagnostic::get(
SM, Name,
"numeric variable with name '" +
Name + "' already exists"));
continue;
}
GlobalVariableTable.insert(CmdlineNameVal);
// Mark the string variable as defined to detect collisions between
// string and numeric variables in defineCmdlineVariables when the latter
// is created later than the former. We cannot reuse GlobalVariableTable
// for this by populating it with an empty string since we would then
// lose the ability to detect the use of an undefined variable in
// match().
DefinedVariableTable[Name] = true;
}
}
return Errs;
}
void FileCheckPatternContext::clearLocalVars() {
SmallVector<StringRef, 16> LocalPatternVars, LocalNumericVars;
for (const StringMapEntry<StringRef> &Var : GlobalVariableTable)
if (Var.first()[0] != '$')
LocalPatternVars.push_back(Var.first());
// Numeric substitution reads the value of a variable directly, not via
// GlobalNumericVariableTable. Therefore, we clear local variables by
// clearing their value which will lead to a numeric substitution failure. We
// also mark the variable for removal from GlobalNumericVariableTable since
// this is what defineCmdlineVariables checks to decide that no global
// variable has been defined.
for (const auto &Var : GlobalNumericVariableTable)
if (Var.first()[0] != '$') {
Var.getValue()->clearValue();
LocalNumericVars.push_back(Var.first());
}
for (const auto &Var : LocalPatternVars)
GlobalVariableTable.erase(Var);
for (const auto &Var : LocalNumericVars)
GlobalNumericVariableTable.erase(Var);
}
bool FileCheck::checkInput(SourceMgr &SM, StringRef Buffer,
std::vector<FileCheckDiag> *Diags) {
bool ChecksFailed = false;
unsigned i = 0, j = 0, e = CheckStrings->size();
while (true) {
StringRef CheckRegion;
if (j == e) {
CheckRegion = Buffer;
} else {
const FileCheckString &CheckLabelStr = (*CheckStrings)[j];
if (CheckLabelStr.Pat.getCheckTy() != 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, Req, Diags);
if (MatchLabelPos == StringRef::npos)
// Immediately bail if CHECK-LABEL fails, nothing else we can do.
return false;
CheckRegion = Buffer.substr(0, MatchLabelPos + MatchLabelLen);
Buffer = Buffer.substr(MatchLabelPos + MatchLabelLen);
++j;
}
// Do not clear the first region as it's the one before the first
// CHECK-LABEL and it would clear variables defined on the command-line
// before they get used.
if (i != 0 && Req.EnableVarScope)
PatternContext->clearLocalVars();
for (; i != j; ++i) {
const FileCheckString &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, Req, Diags);
if (MatchPos == StringRef::npos) {
ChecksFailed = true;
i = j;
break;
}
CheckRegion = CheckRegion.substr(MatchPos + MatchLen);
}
if (j == e)
break;
}
// Success if no checks failed.
return !ChecksFailed;
}