1 //===- ObjCRuntime.cpp - Objective-C Runtime Handling -----------*- C++ -*-===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file implements the ObjCRuntime class, which represents the
11 // target Objective-C runtime.
12 //
13 //===----------------------------------------------------------------------===//
14 #include "clang/Basic/ObjCRuntime.h"
15 #include "llvm/Support/raw_ostream.h"
16 
17 using namespace clang;
18 
19 std::string ObjCRuntime::getAsString() const {
20   std::string Result;
21   {
22     llvm::raw_string_ostream Out(Result);
23     Out << *this;
24   }
25   return Result;
26 }
27 
28 raw_ostream &clang::operator<<(raw_ostream &out, const ObjCRuntime &value) {
29   switch (value.getKind()) {
30   case ObjCRuntime::MacOSX: out << "macosx"; break;
31   case ObjCRuntime::FragileMacOSX: out << "macosx-fragile"; break;
32   case ObjCRuntime::iOS: out << "ios"; break;
33   case ObjCRuntime::GNU: out << "gnu"; break;
34   case ObjCRuntime::FragileGNU: out << "gnu-fragile"; break;
35   }
36   if (value.getVersion() > VersionTuple(0)) {
37     out << '-' << value.getVersion();
38   }
39   return out;
40 }
41 
42 bool ObjCRuntime::tryParse(StringRef input) {
43   // Look for the last dash.
44   std::size_t dash = input.rfind('-');
45 
46   // We permit dashes in the runtime name, and we also permit the
47   // version to be omitted, so if we see a dash not followed by a
48   // digit then we need to ignore it.
49   if (dash != StringRef::npos && dash + 1 != input.size() &&
50       (input[dash+1] < '0' || input[dash+1] > '9')) {
51     dash = StringRef::npos;
52   }
53 
54   // Everything prior to that must be a valid string name.
55   Kind kind;
56   StringRef runtimeName = input.substr(0, dash);
57   if (runtimeName == "macosx") {
58     kind = ObjCRuntime::MacOSX;
59   } else if (runtimeName == "macosx-fragile") {
60     kind = ObjCRuntime::FragileMacOSX;
61   } else if (runtimeName == "ios") {
62     kind = ObjCRuntime::iOS;
63   } else if (runtimeName == "gnu") {
64     kind = ObjCRuntime::GNU;
65   } else if (runtimeName == "gnu-fragile") {
66     kind = ObjCRuntime::FragileGNU;
67   } else {
68     return true;
69   }
70   TheKind = kind;
71 
72   Version = VersionTuple(0);
73   if (dash != StringRef::npos) {
74     StringRef verString = input.substr(dash + 1);
75     if (Version.tryParse(verString))
76       return true;
77   }
78 
79   return false;
80 }
81