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 
22 SingleStringMatcher::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()));
31       return;
32     }
33     ExactMatch = false;
34     GlobPatternMatcher = *Glob;
35   }
36 }
37 
38 bool SingleStringMatcher::match(StringRef s) const {
39   return ExactMatch ? (ExactPattern == s) : GlobPatternMatcher.match(s);
40 }
41 
42 bool 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.
50 SmallVector<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.
66 bool 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
72 void 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