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