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
19 using namespace llvm;
20 using namespace lld;
21
isExact(StringRef Pattern)22 static bool isExact(StringRef Pattern) {
23 return Pattern.size() > 2 && Pattern.starts_with("\"") &&
24 Pattern.ends_with("\"");
25 }
26
SingleStringMatcher(StringRef Pattern)27 SingleStringMatcher::SingleStringMatcher(StringRef Pattern)
28 : ExactMatch(isExact(Pattern)) {
29 if (ExactMatch) {
30 ExactPattern = Pattern.substr(1, Pattern.size() - 2);
31 } else {
32 Expected<GlobPattern> Glob = GlobPattern::create(Pattern);
33 if (!Glob) {
34 error(toString(Glob.takeError()) + ": " + Pattern);
35 return;
36 }
37 GlobPatternMatcher = *Glob;
38 }
39 }
40
match(StringRef s) const41 bool SingleStringMatcher::match(StringRef s) const {
42 return ExactMatch ? (ExactPattern == s) : GlobPatternMatcher.match(s);
43 }
44
match(StringRef s) const45 bool 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.
parseHex(StringRef s)53 SmallVector<uint8_t, 0> lld::parseHex(StringRef s) {
54 SmallVector<uint8_t, 0> hex;
55 while (!s.empty()) {
56 StringRef b = s.substr(0, 2);
57 s = s.substr(2);
58 uint8_t h;
59 if (!to_integer(b, h, 16)) {
60 error("not a hexadecimal value: " + b);
61 return {};
62 }
63 hex.push_back(h);
64 }
65 return hex;
66 }
67
68 // Returns true if S is valid as a C language identifier.
isValidCIdentifier(StringRef s)69 bool lld::isValidCIdentifier(StringRef s) {
70 return !s.empty() && !isDigit(s[0]) &&
71 llvm::all_of(s, [](char c) { return isAlnum(c) || c == '_'; });
72 }
73
74 // Write the contents of the a buffer to a file
saveBuffer(StringRef buffer,const Twine & path)75 void 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("cannot create " + path + ": " + ec.message());
80 os << buffer;
81 }
82