llvm-project

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//===- Strings.cpp -------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "lld/Common/Strings.h"
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#include "lld/Common/ErrorHandler.h"
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#include "lld/Common/LLVM.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/GlobPattern.h"
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#include <algorithm>
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#include <mutex>
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#include <vector>
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using namespace llvm;
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using namespace lld;
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SingleStringMatcher::SingleStringMatcher(StringRef Pattern) {
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  if (Pattern.size() > 2 && Pattern.starts_with("\"") &&
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      Pattern.ends_with("\"")) {
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    ExactMatch = true;
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    ExactPattern = Pattern.substr(1, Pattern.size() - 2);
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  } else {
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    Expected<GlobPattern> Glob = GlobPattern::create(Pattern);
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    if (!Glob) {
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      error(toString(Glob.takeError()) + ": " + Pattern);
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      return;
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    }
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    ExactMatch = false;
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    GlobPatternMatcher = *Glob;
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  }
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}
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bool SingleStringMatcher::match(StringRef s) const {
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  return ExactMatch ? (ExactPattern == s) : GlobPatternMatcher.match(s);
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}
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bool StringMatcher::match(StringRef s) const {
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  for (const SingleStringMatcher &pat : patterns)
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    if (pat.match(s))
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      return true;
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  return false;
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}
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// Converts a hex string (e.g. "deadbeef") to a vector.
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SmallVector<uint8_t, 0> lld::parseHex(StringRef s) {
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  SmallVector<uint8_t, 0> hex;
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  while (!s.empty()) {
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    StringRef b = s.substr(0, 2);
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    s = s.substr(2);
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    uint8_t h;
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    if (!to_integer(b, h, 16)) {
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      error("not a hexadecimal value: " + b);
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      return {};
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    }
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    hex.push_back(h);
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  }
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  return hex;
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}
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// Returns true if S is valid as a C language identifier.
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bool lld::isValidCIdentifier(StringRef s) {
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  return !s.empty() && !isDigit(s[0]) &&
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         llvm::all_of(s, [](char c) { return isAlnum(c) || c == '_'; });
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}
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// Write the contents of the a buffer to a file
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void lld::saveBuffer(StringRef buffer, const Twine &path) {
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  std::error_code ec;
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  raw_fd_ostream os(path.str(), ec, sys::fs::OpenFlags::OF_None);
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  if (ec)
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    error("cannot create " + path + ": " + ec.message());
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  os << buffer;
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}
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