1 //===- Strings.cpp -------------------------------------------------------===//
2 //
3 //                             The LLVM Linker
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #include "lld/Common/Strings.h"
11 #include "lld/Common/ErrorHandler.h"
12 #include "lld/Common/LLVM.h"
13 #include "llvm/Demangle/Demangle.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 // Returns the demangled C++ symbol name for Name.
23 Optional<std::string> lld::demangleItanium(StringRef Name) {
24   // itaniumDemangle can be used to demangle strings other than symbol
25   // names which do not necessarily start with "_Z". Name can be
26   // either a C or C++ symbol. Don't call itaniumDemangle if the name
27   // does not look like a C++ symbol name to avoid getting unexpected
28   // result for a C symbol that happens to match a mangled type name.
29   if (!Name.startswith("_Z"))
30     return None;
31 
32   char *Buf = itaniumDemangle(Name.str().c_str(), nullptr, nullptr, nullptr);
33   if (!Buf)
34     return None;
35   std::string S(Buf);
36   free(Buf);
37   return S;
38 }
39 
40 Optional<std::string> lld::demangleMSVC(StringRef Name) {
41   std::string Prefix;
42   if (Name.consume_front("__imp_"))
43     Prefix = "__declspec(dllimport) ";
44 
45   // Demangle only C++ names.
46   if (!Name.startswith("?"))
47     return None;
48 
49   char *Buf = microsoftDemangle(Name.str().c_str(), nullptr, nullptr, nullptr);
50   if (!Buf)
51     return None;
52   std::string S(Buf);
53   free(Buf);
54   return Prefix + S;
55 }
56 
57 StringMatcher::StringMatcher(ArrayRef<StringRef> Pat) {
58   for (StringRef S : Pat) {
59     Expected<GlobPattern> Pat = GlobPattern::create(S);
60     if (!Pat)
61       error(toString(Pat.takeError()));
62     else
63       Patterns.push_back(*Pat);
64   }
65 }
66 
67 bool StringMatcher::match(StringRef S) const {
68   for (const GlobPattern &Pat : Patterns)
69     if (Pat.match(S))
70       return true;
71   return false;
72 }
73 
74 // Converts a hex string (e.g. "deadbeef") to a vector.
75 std::vector<uint8_t> lld::parseHex(StringRef S) {
76   std::vector<uint8_t> Hex;
77   while (!S.empty()) {
78     StringRef B = S.substr(0, 2);
79     S = S.substr(2);
80     uint8_t H;
81     if (!to_integer(B, H, 16)) {
82       error("not a hexadecimal value: " + B);
83       return {};
84     }
85     Hex.push_back(H);
86   }
87   return Hex;
88 }
89 
90 // Returns true if S is valid as a C language identifier.
91 bool lld::isValidCIdentifier(StringRef S) {
92   return !S.empty() && (isAlpha(S[0]) || S[0] == '_') &&
93          std::all_of(S.begin() + 1, S.end(),
94                      [](char C) { return C == '_' || isAlnum(C); });
95 }
96 
97 // Write the contents of the a buffer to a file
98 void lld::saveBuffer(StringRef Buffer, const Twine &Path) {
99   std::error_code EC;
100   raw_fd_ostream OS(Path.str(), EC, sys::fs::OpenFlags::F_None);
101   if (EC)
102     error("cannot create " + Path + ": " + EC.message());
103   OS << Buffer;
104 }
105