2946cd7010
to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
132 lines
3.5 KiB
C++
132 lines
3.5 KiB
C++
//===- lib/ReaderWriter/MachO/ObjCPass.cpp -------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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//===----------------------------------------------------------------------===//
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#include "ArchHandler.h"
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#include "File.h"
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#include "MachONormalizedFileBinaryUtils.h"
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#include "MachOPasses.h"
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#include "lld/Common/LLVM.h"
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#include "lld/Core/DefinedAtom.h"
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#include "lld/Core/File.h"
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#include "lld/Core/Reference.h"
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#include "lld/Core/Simple.h"
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#include "lld/ReaderWriter/MachOLinkingContext.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/STLExtras.h"
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namespace lld {
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namespace mach_o {
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///
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/// ObjC Image Info Atom created by the ObjC pass.
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///
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class ObjCImageInfoAtom : public SimpleDefinedAtom {
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public:
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ObjCImageInfoAtom(const File &file, bool isBig,
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MachOLinkingContext::ObjCConstraint objCConstraint,
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uint32_t swiftVersion)
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: SimpleDefinedAtom(file) {
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Data.info.version = 0;
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switch (objCConstraint) {
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case MachOLinkingContext::objc_unknown:
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llvm_unreachable("Shouldn't run the objc pass without a constraint");
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case MachOLinkingContext::objc_supports_gc:
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case MachOLinkingContext::objc_gc_only:
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llvm_unreachable("GC is not supported");
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case MachOLinkingContext::objc_retainReleaseForSimulator:
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// The retain/release for simulator flag is already the correct
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// encoded value for the data so just set it here.
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Data.info.flags = (uint32_t)objCConstraint;
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break;
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case MachOLinkingContext::objc_retainRelease:
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// We don't need to encode this flag, so just leave the flags as 0.
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Data.info.flags = 0;
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break;
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}
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Data.info.flags |= (swiftVersion << 8);
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normalized::write32(Data.bytes + 4, Data.info.flags, isBig);
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}
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~ObjCImageInfoAtom() override = default;
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ContentType contentType() const override {
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return DefinedAtom::typeObjCImageInfo;
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}
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Alignment alignment() const override {
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return 4;
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}
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uint64_t size() const override {
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return 8;
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}
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ContentPermissions permissions() const override {
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return DefinedAtom::permR__;
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}
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ArrayRef<uint8_t> rawContent() const override {
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return llvm::makeArrayRef(Data.bytes, size());
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}
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private:
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struct objc_image_info {
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uint32_t version;
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uint32_t flags;
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};
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union {
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objc_image_info info;
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uint8_t bytes[8];
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} Data;
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};
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class ObjCPass : public Pass {
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public:
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ObjCPass(const MachOLinkingContext &context)
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: _ctx(context),
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_file(*_ctx.make_file<MachOFile>("<mach-o objc pass>")) {
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_file.setOrdinal(_ctx.getNextOrdinalAndIncrement());
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}
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llvm::Error perform(SimpleFile &mergedFile) override {
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// Add the image info.
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mergedFile.addAtom(*getImageInfo());
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return llvm::Error::success();
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}
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private:
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const DefinedAtom* getImageInfo() {
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bool IsBig = MachOLinkingContext::isBigEndian(_ctx.arch());
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return new (_file.allocator()) ObjCImageInfoAtom(_file, IsBig,
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_ctx.objcConstraint(),
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_ctx.swiftVersion());
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}
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const MachOLinkingContext &_ctx;
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MachOFile &_file;
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};
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void addObjCPass(PassManager &pm, const MachOLinkingContext &ctx) {
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pm.add(llvm::make_unique<ObjCPass>(ctx));
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}
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} // end namespace mach_o
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} // end namespace lld
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