1//===- Strings.cpp -------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#include "lld/Common/Strings.h"
10#include "lld/Common/ErrorHandler.h"
11#include "lld/Common/LLVM.h"
12#include "llvm/ADT/StringExtras.h"
13#include "llvm/Support/FileSystem.h"
14#include "llvm/Support/GlobPattern.h"
15#include <algorithm>
16#include <mutex>
17#include <vector>
18
19using namespace llvm;
20using namespace lld;
21
22SingleStringMatcher::SingleStringMatcher(StringRef Pattern) {
23  if (Pattern.size() > 2 && Pattern.starts_with("\"") &&
24      Pattern.ends_with("\"")) {
25    ExactMatch = true;
26    ExactPattern = Pattern.substr(1, Pattern.size() - 2);
27  } else {
28    Expected<GlobPattern> Glob = GlobPattern::create(Pattern);
29    if (!Glob) {
30      error(toString(Glob.takeError()) + ": " + Pattern);
31      return;
32    }
33    ExactMatch = false;
34    GlobPatternMatcher = *Glob;
35  }
36}
37
38bool SingleStringMatcher::match(StringRef s) const {
39  return ExactMatch ? (ExactPattern == s) : GlobPatternMatcher.match(s);
40}
41
42bool StringMatcher::match(StringRef s) const {
43  for (const SingleStringMatcher &pat : patterns)
44    if (pat.match(s))
45      return true;
46  return false;
47}
48
49// Converts a hex string (e.g. "deadbeef") to a vector.
50SmallVector<uint8_t, 0> lld::parseHex(StringRef s) {
51  SmallVector<uint8_t, 0> hex;
52  while (!s.empty()) {
53    StringRef b = s.substr(0, 2);
54    s = s.substr(2);
55    uint8_t h;
56    if (!to_integer(b, h, 16)) {
57      error("not a hexadecimal value: " + b);
58      return {};
59    }
60    hex.push_back(h);
61  }
62  return hex;
63}
64
65// Returns true if S is valid as a C language identifier.
66bool lld::isValidCIdentifier(StringRef s) {
67  return !s.empty() && !isDigit(s[0]) &&
68         llvm::all_of(s, [](char c) { return isAlnum(c) || c == '_'; });
69}
70
71// Write the contents of the a buffer to a file
72void lld::saveBuffer(StringRef buffer, const Twine &path) {
73  std::error_code ec;
74  raw_fd_ostream os(path.str(), ec, sys::fs::OpenFlags::OF_None);
75  if (ec)
76    error("cannot create " + path + ": " + ec.message());
77  os << buffer;
78}
79