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
22static bool isExact(StringRef Pattern) {
23 return Pattern.size() > 2 && Pattern.starts_with(Prefix: "\"") &&
24 Pattern.ends_with(Suffix: "\"");
25}
26
27SingleStringMatcher::SingleStringMatcher(StringRef Pattern)
28 : ExactMatch(isExact(Pattern)) {
29 if (ExactMatch) {
30 ExactPattern = Pattern.substr(Start: 1, N: Pattern.size() - 2);
31 } else {
32 Expected<GlobPattern> Glob = GlobPattern::create(Pat: Pattern);
33 if (!Glob) {
34 error(msg: toString(E: Glob.takeError()) + ": " + Pattern);
35 return;
36 }
37 GlobPatternMatcher = *Glob;
38 }
39}
40
41bool SingleStringMatcher::match(StringRef s) const {
42 return ExactMatch ? (ExactPattern == s) : GlobPatternMatcher.match(S: s);
43}
44
45bool StringMatcher::match(StringRef s) const {
46 for (const SingleStringMatcher &pat : patterns)
47 if (pat.match(s))
48 return true;
49 return false;
50}
51
52// Converts a hex string (e.g. "deadbeef") to a vector.
53SmallVector<uint8_t, 0> lld::parseHex(StringRef s) {
54 SmallVector<uint8_t, 0> hex;
55 while (!s.empty()) {
56 StringRef b = s.substr(Start: 0, N: 2);
57 s = s.substr(Start: 2);
58 uint8_t h;
59 if (!to_integer(S: b, Num&: h, Base: 16)) {
60 error(msg: "not a hexadecimal value: " + b);
61 return {};
62 }
63 hex.push_back(Elt: h);
64 }
65 return hex;
66}
67
68// Returns true if S is valid as a C language identifier.
69bool lld::isValidCIdentifier(StringRef s) {
70 return !s.empty() && !isDigit(C: s[0]) &&
71 llvm::all_of(Range&: s, P: [](char c) { return isAlnum(C: c) || c == '_'; });
72}
73
74// Write the contents of the a buffer to a file
75void lld::saveBuffer(StringRef buffer, const Twine &path) {
76 std::error_code ec;
77 raw_fd_ostream os(path.str(), ec, sys::fs::OpenFlags::OF_None);
78 if (ec)
79 error(msg: "cannot create " + path + ": " + ec.message());
80 os << buffer;
81}
82