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/Support/FileSystem.h"
  13 #include "llvm/Support/GlobPattern.h"
  14 #include <algorithm>
  15 #include <mutex>
  16 #include <vector>
  17
  18 using namespace llvm;
  19 using namespace lld;
  20
  21 SingleStringMatcher::SingleStringMatcher(StringRef Pattern) {
  22   if (Pattern.size() > 2 && Pattern.startswith("\"") &&
  23       Pattern.endswith("\"")) {
  24     ExactMatch = true;
  25     ExactPattern = Pattern.substr(1, Pattern.size() - 2);
  26   } else {
  27     Expected<GlobPattern> Glob = GlobPattern::create(Pattern);
  28     if (!Glob) {
  29       error(toString(Glob.takeError()));
  30       return;
  31     }
  32     ExactMatch = false;
  33     GlobPatternMatcher = *Glob;
  34   }
  35 }
  36
  37 bool SingleStringMatcher::match(StringRef s) const {
  38   return ExactMatch ? (ExactPattern == s) : GlobPatternMatcher.match(s);
  39 }
  40
  41 bool StringMatcher::match(StringRef s) const {
  42   for (const SingleStringMatcher &pat : patterns)
  43     if (pat.match(s))
  44       return true;
  45   return false;
  46 }
  47
  48 // Converts a hex string (e.g. "deadbeef") to a vector.
  49 SmallVector<uint8_t, 0> lld::parseHex(StringRef s) {
  50   SmallVector<uint8_t, 0> hex;
  51   while (!s.empty()) {
  52     StringRef b = s.substr(0, 2);
  53     s = s.substr(2);
  54     uint8_t h;
  55     if (!to_integer(b, h, 16)) {
  56       error("not a hexadecimal value: " + b);
  57       return {};
  58     }
  59     hex.push_back(h);
  60   }
  61   return hex;
  62 }
  63
  64 // Returns true if S is valid as a C language identifier.
  65 bool lld::isValidCIdentifier(StringRef s) {
  66   return !s.empty() && !isDigit(s[0]) &&
  67          llvm::all_of(s, [](char c) { return isAlnum(c) || c == '_'; });
  68 }
  69
  70 // Write the contents of the a buffer to a file
  71 void lld::saveBuffer(StringRef buffer, const Twine &path) {
  72   std::error_code ec;
  73   raw_fd_ostream os(path.str(), ec, sys::fs::OpenFlags::OF_None);
  74   if (ec)
  75     error("cannot create " + path + ": " + ec.message());
  76   os << buffer;
  77 }