1 //===- Utils.h --------------------------------------------------*- C++ -*-===//
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 #ifndef LLVM_DWARFLINKER_UTILS_H
10 #define LLVM_DWARFLINKER_UTILS_H
11 
12 #include "llvm/ADT/SmallString.h"
13 #include "llvm/ADT/Twine.h"
14 #include "llvm/Support/Error.h"
15 #include "llvm/Support/FileSystem.h"
16 #include "llvm/Support/Path.h"
17 
18 namespace llvm {
19 namespace dwarf_linker {
20 
21 /// This function calls \p Iteration() until it returns false.
22 /// If number of iterations exceeds \p MaxCounter then an Error is returned.
23 /// This function should be used for loops which assumed to have number of
24 /// iterations significantly smaller than \p MaxCounter to avoid infinite
25 /// looping in error cases.
26 inline Error finiteLoop(function_ref<Expected<bool>()> Iteration,
27                         size_t MaxCounter = 100000) {
28   size_t iterationsCounter = 0;
29   while (iterationsCounter++ < MaxCounter) {
30     Expected<bool> IterationResultOrError = Iteration();
31     if (!IterationResultOrError)
32       return IterationResultOrError.takeError();
33     if (!IterationResultOrError.get())
34       return Error::success();
35   }
36   return createStringError(std::errc::invalid_argument, "Infinite recursion");
37 }
38 
39 /// Make a best effort to guess the
40 /// Xcode.app/Contents/Developer/Toolchains/ path from an SDK path.
41 inline SmallString<128> guessToolchainBaseDir(StringRef SysRoot) {
42   SmallString<128> Result;
43   // Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk
44   StringRef Base = sys::path::parent_path(SysRoot);
45   if (sys::path::filename(Base) != "SDKs")
46     return Result;
47   Base = sys::path::parent_path(Base);
48   Result = Base;
49   Result += "/Toolchains";
50   return Result;
51 }
52 
53 inline bool isPathAbsoluteOnWindowsOrPosix(const Twine &Path) {
54   // Debug info can contain paths from any OS, not necessarily
55   // an OS we're currently running on. Moreover different compilation units can
56   // be compiled on different operating systems and linked together later.
57   return sys::path::is_absolute(Path, sys::path::Style::posix) ||
58          sys::path::is_absolute(Path, sys::path::Style::windows);
59 }
60 
61 } // end of namespace dwarf_linker
62 } // end of namespace llvm
63 
64 #endif // LLVM_DWARFLINKER_UTILS_H
65