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NFC. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@232976 91177308-0d34-0410-b5e6-96231b3b80d8
169 lines
5.8 KiB
C++
169 lines
5.8 KiB
C++
//===-- SpecialCaseList.cpp - special case list for sanitizers ------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This is a utility class for instrumentation passes (like AddressSanitizer
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// or ThreadSanitizer) to avoid instrumenting some functions or global
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// variables, or to instrument some functions or global variables in a specific
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// way, based on a user-supplied list.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/SpecialCaseList.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/ADT/StringSet.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/Regex.h"
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#include <string>
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#include <system_error>
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#include <utility>
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namespace llvm {
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/// Represents a set of regular expressions. Regular expressions which are
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/// "literal" (i.e. no regex metacharacters) are stored in Strings, while all
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/// others are represented as a single pipe-separated regex in RegEx. The
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/// reason for doing so is efficiency; StringSet is much faster at matching
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/// literal strings than Regex.
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struct SpecialCaseList::Entry {
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Entry() {}
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Entry(Entry &&Other)
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: Strings(std::move(Other.Strings)), RegEx(std::move(Other.RegEx)) {}
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StringSet<> Strings;
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std::unique_ptr<Regex> RegEx;
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bool match(StringRef Query) const {
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return Strings.count(Query) || (RegEx && RegEx->match(Query));
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}
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};
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SpecialCaseList::SpecialCaseList() : Entries(), Regexps(), IsCompiled(false) {}
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std::unique_ptr<SpecialCaseList>
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SpecialCaseList::create(const std::vector<std::string> &Paths,
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std::string &Error) {
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std::unique_ptr<SpecialCaseList> SCL(new SpecialCaseList());
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for (auto Path : Paths) {
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ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
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MemoryBuffer::getFile(Path);
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if (std::error_code EC = FileOrErr.getError()) {
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Error = (Twine("can't open file '") + Path + "': " + EC.message()).str();
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return nullptr;
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}
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std::string ParseError;
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if (!SCL->parse(FileOrErr.get().get(), ParseError)) {
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Error = (Twine("error parsing file '") + Path + "': " + ParseError).str();
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return nullptr;
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}
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}
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SCL->compile();
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return SCL;
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}
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std::unique_ptr<SpecialCaseList> SpecialCaseList::create(const MemoryBuffer *MB,
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std::string &Error) {
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std::unique_ptr<SpecialCaseList> SCL(new SpecialCaseList());
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if (!SCL->parse(MB, Error))
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return nullptr;
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SCL->compile();
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return SCL;
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}
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std::unique_ptr<SpecialCaseList>
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SpecialCaseList::createOrDie(const std::vector<std::string> &Paths) {
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std::string Error;
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if (auto SCL = create(Paths, Error))
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return SCL;
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report_fatal_error(Error);
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}
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bool SpecialCaseList::parse(const MemoryBuffer *MB, std::string &Error) {
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// Iterate through each line in the blacklist file.
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SmallVector<StringRef, 16> Lines;
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SplitString(MB->getBuffer(), Lines, "\n\r");
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int LineNo = 1;
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for (auto I = Lines.begin(), E = Lines.end(); I != E; ++I, ++LineNo) {
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// Ignore empty lines and lines starting with "#"
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if (I->empty() || I->startswith("#"))
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continue;
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// Get our prefix and unparsed regexp.
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std::pair<StringRef, StringRef> SplitLine = I->split(":");
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StringRef Prefix = SplitLine.first;
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if (SplitLine.second.empty()) {
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// Missing ':' in the line.
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Error = (Twine("malformed line ") + Twine(LineNo) + ": '" +
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SplitLine.first + "'").str();
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return false;
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}
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std::pair<StringRef, StringRef> SplitRegexp = SplitLine.second.split("=");
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std::string Regexp = SplitRegexp.first;
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StringRef Category = SplitRegexp.second;
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// See if we can store Regexp in Strings.
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if (Regex::isLiteralERE(Regexp)) {
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Entries[Prefix][Category].Strings.insert(Regexp);
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continue;
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}
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// Replace * with .*
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for (size_t pos = 0; (pos = Regexp.find("*", pos)) != std::string::npos;
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pos += strlen(".*")) {
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Regexp.replace(pos, strlen("*"), ".*");
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}
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// Check that the regexp is valid.
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Regex CheckRE(Regexp);
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std::string REError;
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if (!CheckRE.isValid(REError)) {
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Error = (Twine("malformed regex in line ") + Twine(LineNo) + ": '" +
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SplitLine.second + "': " + REError).str();
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return false;
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}
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// Add this regexp into the proper group by its prefix.
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if (!Regexps[Prefix][Category].empty())
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Regexps[Prefix][Category] += "|";
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Regexps[Prefix][Category] += "^" + Regexp + "$";
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}
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return true;
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}
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void SpecialCaseList::compile() {
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assert(!IsCompiled && "compile() should only be called once");
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// Iterate through each of the prefixes, and create Regexs for them.
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for (StringMap<StringMap<std::string>>::const_iterator I = Regexps.begin(),
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E = Regexps.end();
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I != E; ++I) {
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for (StringMap<std::string>::const_iterator II = I->second.begin(),
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IE = I->second.end();
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II != IE; ++II) {
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Entries[I->getKey()][II->getKey()].RegEx.reset(new Regex(II->getValue()));
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}
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}
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Regexps.clear();
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IsCompiled = true;
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}
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SpecialCaseList::~SpecialCaseList() {}
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bool SpecialCaseList::inSection(StringRef Section, StringRef Query,
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StringRef Category) const {
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assert(IsCompiled && "SpecialCaseList::compile() was not called!");
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StringMap<StringMap<Entry> >::const_iterator I = Entries.find(Section);
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if (I == Entries.end()) return false;
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StringMap<Entry>::const_iterator II = I->second.find(Category);
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if (II == I->second.end()) return false;
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return II->getValue().match(Query);
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}
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} // namespace llvm
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