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/Demangle/Demangle.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
22// Returns the demangled C++ symbol name for name.
23std::string lld::demangleItanium(StringRef name) {
24  // itaniumDemangle can be used to demangle strings other than symbol
25  // names which do not necessarily start with "_Z". Name can be
26  // either a C or C++ symbol. Don't call demangle if the name
27  // does not look like a C++ symbol name to avoid getting unexpected
28  // result for a C symbol that happens to match a mangled type name.
29  if (!name.startswith("_Z"))
30    return std::string(name);
31
32  return demangle(std::string(name));
33}
34
35SingleStringMatcher::SingleStringMatcher(StringRef Pattern) {
36  if (Pattern.size() > 2 && Pattern.startswith("\"") &&
37      Pattern.endswith("\"")) {
38    ExactMatch = true;
39    ExactPattern = Pattern.substr(1, Pattern.size() - 2);
40  } else {
41    Expected<GlobPattern> Glob = GlobPattern::create(Pattern);
42    if (!Glob) {
43      error(toString(Glob.takeError()));
44      return;
45    }
46    ExactMatch = false;
47    GlobPatternMatcher = *Glob;
48  }
49}
50
51bool SingleStringMatcher::match(StringRef s) const {
52  return ExactMatch ? (ExactPattern == s) : GlobPatternMatcher.match(s);
53}
54
55bool StringMatcher::match(StringRef s) const {
56  for (const SingleStringMatcher &pat : patterns)
57    if (pat.match(s))
58      return true;
59  return false;
60}
61
62// Converts a hex string (e.g. "deadbeef") to a vector.
63std::vector<uint8_t> lld::parseHex(StringRef s) {
64  std::vector<uint8_t> hex;
65  while (!s.empty()) {
66    StringRef b = s.substr(0, 2);
67    s = s.substr(2);
68    uint8_t h;
69    if (!to_integer(b, h, 16)) {
70      error("not a hexadecimal value: " + b);
71      return {};
72    }
73    hex.push_back(h);
74  }
75  return hex;
76}
77
78// Returns true if S is valid as a C language identifier.
79bool lld::isValidCIdentifier(StringRef s) {
80  return !s.empty() && (isAlpha(s[0]) || s[0] == '_') &&
81         std::all_of(s.begin() + 1, s.end(),
82                     [](char c) { return c == '_' || isAlnum(c); });
83}
84
85// Write the contents of the a buffer to a file
86void lld::saveBuffer(StringRef buffer, const Twine &path) {
87  std::error_code ec;
88  raw_fd_ostream os(path.str(), ec, sys::fs::OpenFlags::OF_None);
89  if (ec)
90    error("cannot create " + path + ": " + ec.message());
91  os << buffer;
92}
93