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diff --git a/lld/MachO/SectionPriorities.h b/lld/MachO/SectionPriorities.h
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+//===- SectionPriorities.h --------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLD_MACHO_SECTION_PRIORITIES_H
+#define LLD_MACHO_SECTION_PRIORITIES_H
+
+#include "InputSection.h"
+#include "llvm/ADT/DenseMap.h"
+
+namespace lld {
+namespace macho {
+
+// Reads every input section's call graph profile, and combines them into
+// config->callGraphProfile. If an order file is present, any edges where one
+// or both of the vertices are specified in the order file are discarded.
+void extractCallGraphProfile();
+
+// Reads the order file at `path` into config->priorities.
+//
+// An order file has one entry per line, in the following format:
+//
+//   <cpu>:<object file>:<symbol name>
+//
+// <cpu> and <object file> are optional. If not specified, then that entry
+// matches any symbol of that name. Parsing this format is not quite
+// straightforward because the symbol name itself can contain colons, so when
+// encountering a colon, we consider the preceding characters to decide if it
+// can be a valid CPU type or file path.
+//
+// If a symbol is matched by multiple entries, then it takes the lowest-ordered
+// entry (the one nearest to the front of the list.)
+//
+// The file can also have line comments that start with '#'.
+void parseOrderFile(StringRef path);
+
+// Returns layout priorities for some or all input sections. Sections are laid
+// out in decreasing order; that is, a higher priority section will be closer
+// to the beginning of its output section.
+//
+// If either an order file or a call graph profile are present, this is used
+// as the source of priorities. If both are present, the order file takes
+// precedence. If neither is present, an empty map is returned.
+//
+// Each section gets assigned the priority of the highest-priority symbol it
+// contains.
+llvm::DenseMap<const InputSection *, size_t> buildInputSectionPriorities();
+} // namespace macho
+} // namespace lld
+
+#endif