projects / apple / ld64.git / blame
| Commit | Line | Data |
|---|---|---|
| a645023d A |
1 | /* -*- mode: C++; c-basic-offset: 4; tab-width: 4 -*- |
| 2 | * | |
| 3 | * Copyright (c) 2010 Apple Inc. All rights reserved. | |
| 4 | * | |
| 5 | * @APPLE_LICENSE_HEADER_START@ | |
| 6 | * | |
| 7 | * This file contains Original Code and/or Modifications of Original Code | |
| 8 | * as defined in and that are subject to the Apple Public Source License | |
| 9 | * Version 2.0 (the 'License'). You may not use this file except in | |
| 10 | * compliance with the License. Please obtain a copy of the License at | |
| 11 | * http://www.opensource.apple.com/apsl/ and read it before using this | |
| 12 | * file. | |
| 13 | * | |
| 14 | * The Original Code and all software distributed under the License are | |
| 15 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER | |
| 16 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, | |
| 17 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
| 18 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. | |
| 19 | * Please see the License for the specific language governing rights and | |
| 20 | * limitations under the License. | |
| 21 | * | |
| 22 | * @APPLE_LICENSE_HEADER_END@ | |
| 23 | */ | |
| 24 | ||
| 25 | ||
| 26 | #include <stdint.h> | |
| 27 | #include <math.h> | |
| 28 | #include <unistd.h> | |
| 29 | #include <dlfcn.h> | |
| 30 | #include <mach/machine.h> | |
| 31 | ||
| 32 | #include <vector> | |
| 33 | ||
| 34 | #include "ld.hpp" | |
| 35 | #include "dylibs.h" | |
| 36 | ||
| 37 | namespace ld { | |
| 38 | namespace passes { | |
| 39 | namespace dylibs { | |
| 40 | ||
| 41 | ||
| 42 | class WillBeUsed | |
| 43 | { | |
| 44 | public: | |
| 45 | bool operator()(ld::dylib::File* dylib) const { | |
| 46 | return dylib->willRemoved(); | |
| 47 | } | |
| 48 | }; | |
| 49 | ||
| 50 | ||
| 51 | void doPass(const Options& opts, ld::Internal& state) | |
| 52 | { | |
| 53 | // const bool log = false; | |
| 54 | ||
| 55 | // only optimize dylibs in final linked images | |
| 56 | if ( opts.outputKind() == Options::kObjectFile ) | |
| 57 | return; | |
| 58 | ||
| 59 | // clear "willRemoved" bit on all dylibs | |
| 60 | for (std::vector<ld::dylib::File*>::iterator it = state.dylibs.begin(); it != state.dylibs.end(); ++it) { | |
| 61 | ld::dylib::File* aDylib = *it; | |
| 62 | aDylib->setWillBeRemoved(false); | |
| 63 | } | |
| 64 | for (std::vector<ld::dylib::File*>::iterator it = state.dylibs.begin(); it != state.dylibs.end(); ++it) { | |
| 65 | ld::dylib::File* aDylib = *it; | |
| 66 | // set "willRemoved" bit on implicit dylibs that did not provide any exports | |
| 67 | if ( aDylib->implicitlyLinked() && !aDylib->explicitlyLinked() && !aDylib->providedExportAtom() ) | |
| 68 | aDylib->setWillBeRemoved(true); | |
| 69 | // set "willRemoved" bit on dead strippable explicit dylibs that did not provide any exports | |
| 70 | if ( aDylib->explicitlyLinked() && aDylib->deadStrippable() && !aDylib->providedExportAtom() ) | |
| 71 | aDylib->setWillBeRemoved(true); | |
| 72 | // set "willRemoved" bit on any unused explicit when -dead_strip_dylibs is used | |
| 73 | if ( opts.deadStripDylibs() && !aDylib->providedExportAtom() ) | |
| 74 | aDylib->setWillBeRemoved(true); | |
| 75 | } | |
| 76 | ||
| 77 | ||
| 78 | // remove unused dylibs | |
| 79 | state.dylibs.erase(std::remove_if(state.dylibs.begin(), state.dylibs.end(), WillBeUsed()), state.dylibs.end()); | |
| 80 | ||
| 81 | } | |
| 82 | ||
| 83 | ||
| 84 | } // namespace dylibs | |
| 85 | } // namespace passes | |
| 86 | } // namespace ld |