90dbab0b0d
This pass currently emits an objc image info section if one is required. This section contains the aggregated version and flags for all of the input files. llvm-svn: 258197
127 lines
3.2 KiB
C++
127 lines
3.2 KiB
C++
//===- lib/ReaderWriter/MachO/ObjCPass.cpp -------------------------------===//
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//
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// The LLVM Linker
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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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 "MachOPasses.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/LLVM.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,
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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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}
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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("<mach-o objc pass>") {
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_file.setOrdinal(_ctx.getNextOrdinalAndIncrement());
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}
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std::error_code perform(SimpleFile &mergedFile) override {
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// Add the image info.
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mergedFile.addAtom(*getImageInfo());
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return std::error_code();
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}
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private:
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const DefinedAtom* getImageInfo() {
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return new (_file.allocator()) ObjCImageInfoAtom(_file,
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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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