| //===- 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 |