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
18namespace llvm {
19namespace 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.
26inline 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.
41inline 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
53inline 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