1 //===- ObjCRuntime.cpp - Objective-C Runtime Handling ---------------------===//
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 
15 #include "clang/Basic/ObjCRuntime.h"
16 #include "clang/Basic/VersionTuple.h"
17 #include "llvm/ADT/StringRef.h"
18 #include "llvm/Support/raw_ostream.h"
19 #include <cstddef>
20 #include <string>
21 
22 using namespace clang;
23 
24 std::string ObjCRuntime::getAsString() const {
25   std::string Result;
26   {
27     llvm::raw_string_ostream Out(Result);
28     Out << *this;
29   }
30   return Result;
31 }
32 
33 raw_ostream &clang::operator<<(raw_ostream &out, const ObjCRuntime &value) {
34   switch (value.getKind()) {
35   case ObjCRuntime::MacOSX: out << "macosx"; break;
36   case ObjCRuntime::FragileMacOSX: out << "macosx-fragile"; break;
37   case ObjCRuntime::iOS: out << "ios"; break;
38   case ObjCRuntime::WatchOS: out << "watchos"; break;
39   case ObjCRuntime::GNUstep: out << "gnustep"; break;
40   case ObjCRuntime::GCC: out << "gcc"; break;
41   case ObjCRuntime::ObjFW: out << "objfw"; break;
42   }
43   if (value.getVersion() > VersionTuple(0)) {
44     out << '-' << value.getVersion();
45   }
46   return out;
47 }
48 
49 bool ObjCRuntime::tryParse(StringRef input) {
50   // Look for the last dash.
51   std::size_t dash = input.rfind('-');
52 
53   // We permit dashes in the runtime name, and we also permit the
54   // version to be omitted, so if we see a dash not followed by a
55   // digit then we need to ignore it.
56   if (dash != StringRef::npos && dash + 1 != input.size() &&
57       (input[dash+1] < '0' || input[dash+1] > '9')) {
58     dash = StringRef::npos;
59   }
60 
61   // Everything prior to that must be a valid string name.
62   Kind kind;
63   StringRef runtimeName = input.substr(0, dash);
64   Version = VersionTuple(0);
65   if (runtimeName == "macosx") {
66     kind = ObjCRuntime::MacOSX;
67   } else if (runtimeName == "macosx-fragile") {
68     kind = ObjCRuntime::FragileMacOSX;
69   } else if (runtimeName == "ios") {
70     kind = ObjCRuntime::iOS;
71   } else if (runtimeName == "watchos") {
72     kind = ObjCRuntime::WatchOS;
73   } else if (runtimeName == "gnustep") {
74     // If no version is specified then default to the most recent one that we
75     // know about.
76     Version = VersionTuple(1, 6);
77     kind = ObjCRuntime::GNUstep;
78   } else if (runtimeName == "gcc") {
79     kind = ObjCRuntime::GCC;
80   } else if (runtimeName == "objfw") {
81     kind = ObjCRuntime::ObjFW;
82     Version = VersionTuple(0, 8);
83   } else {
84     return true;
85   }
86   TheKind = kind;
87 
88   if (dash != StringRef::npos) {
89     StringRef verString = input.substr(dash + 1);
90     if (Version.tryParse(verString))
91       return true;
92   }
93 
94   if (kind == ObjCRuntime::ObjFW && Version > VersionTuple(0, 8))
95     Version = VersionTuple(0, 8);
96 
97   return false;
98 }
99