lld/Common/Strings.cpp

   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()) + ": " + Pattern);
  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 }