610 lines
21 KiB
C++
610 lines
21 KiB
C++
//===- Core/NativeReader.cpp - reads native object file ------------------===//
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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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#include <vector>
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#include <assert.h>
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/ADT/OwningPtr.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "lld/Core/Error.h"
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#include "lld/Core/File.h"
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#include "lld/Core/Atom.h"
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#include "NativeFileFormat.h"
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namespace lld {
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// forward reference
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class NativeFile;
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//
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// An object of this class is instantied for each NativeDefinedAtomIvarsV1
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// struct in the NCS_DefinedAtomsV1 chunk.
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//
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class NativeDefinedAtomV1 : public DefinedAtom {
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public:
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NativeDefinedAtomV1(const NativeFile& f,
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const NativeDefinedAtomIvarsV1* ivarData)
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: _file(&f), _ivarData(ivarData) { }
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virtual const class File& file() const;
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virtual uint64_t ordinal() const;
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virtual llvm::StringRef name() const;
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virtual uint64_t size() const {
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return _ivarData->contentSize;
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}
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virtual DefinedAtom::Scope scope() const {
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return (DefinedAtom::Scope)(attributes().scope);
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}
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virtual DefinedAtom::Interposable interposable() const {
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return (DefinedAtom::Interposable)(attributes().interposable);
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}
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virtual DefinedAtom::Merge merge() const {
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return (DefinedAtom::Merge)(attributes().merge);
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}
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virtual DefinedAtom::ContentType contentType() const {
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const NativeAtomAttributesV1& attr = attributes();
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return (DefinedAtom::ContentType)(attr.contentType);
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}
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virtual DefinedAtom::Alignment alignment() const {
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return DefinedAtom::Alignment(attributes().align2, attributes().alignModulus);
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}
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virtual DefinedAtom::SectionChoice sectionChoice() const {
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return (DefinedAtom::SectionChoice)(attributes().sectionChoice);
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}
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virtual llvm::StringRef customSectionName() const;
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virtual DefinedAtom::DeadStripKind deadStrip() const {
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return (DefinedAtom::DeadStripKind)(attributes().deadStrip);
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}
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virtual DefinedAtom::ContentPermissions permissions() const {
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return (DefinedAtom::ContentPermissions)(attributes().permissions);
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}
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virtual bool isThumb() const {
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return false; //(attributes().thumb != 0);
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}
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virtual bool isAlias() const {
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return (attributes().alias != 0);
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}
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virtual llvm::ArrayRef<uint8_t> rawContent() const;
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virtual void forEachReference(ReferenceHandler&) const;
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private:
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const NativeAtomAttributesV1& attributes() const;
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const NativeFile* _file;
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const NativeDefinedAtomIvarsV1* _ivarData;
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};
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//
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// An object of this class is instantied for each NativeUndefinedAtomIvarsV1
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// struct in the NCS_UndefinedAtomsV1 chunk.
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//
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class NativeUndefinedAtomV1 : public UndefinedAtom {
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public:
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NativeUndefinedAtomV1(const NativeFile& f,
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const NativeUndefinedAtomIvarsV1* ivarData)
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: _file(&f), _ivarData(ivarData) { }
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virtual const File& file() const;
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virtual llvm::StringRef name() const;
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virtual bool weakImport() const {
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return (_ivarData->flags & 0x1);
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}
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private:
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const NativeFile* _file;
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const NativeUndefinedAtomIvarsV1* _ivarData;
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};
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//
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// An object of this class is instantied for each NativeReferenceIvarsV1
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// struct in the NCS_ReferencesArrayV1 chunk.
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//
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class NativeReferenceV1 : public Reference {
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public:
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NativeReferenceV1(const NativeFile& f,
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const NativeReferenceIvarsV1* ivarData)
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: _file(&f), _ivarData(ivarData) { }
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virtual uint64_t offsetInAtom() const {
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return _ivarData->offsetInAtom;
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}
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virtual Kind kind() const {
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return _ivarData->kind;
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}
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virtual const Atom* target() const;
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virtual Addend addend() const;
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virtual void setTarget(const Atom* newAtom);
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private:
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const NativeFile* _file;
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const NativeReferenceIvarsV1* _ivarData;
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};
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//
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// lld::File object for native llvm object file
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//
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class NativeFile : public File {
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public:
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/// Instantiates a File object from a native object file. Ownership
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/// of the MemoryBuffer is transfered to the resulting File object.
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static llvm::error_code make(llvm::OwningPtr<llvm::MemoryBuffer>& mb,
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llvm::StringRef path,
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llvm::OwningPtr<File>& result) {
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const uint8_t* const base =
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reinterpret_cast<const uint8_t*>(mb->getBufferStart());
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const NativeFileHeader* const header =
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reinterpret_cast<const NativeFileHeader*>(base);
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const NativeChunk *const chunks =
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reinterpret_cast<const NativeChunk*>(base + sizeof(NativeFileHeader));
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// make sure magic matches
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if ( memcmp(header->magic, NATIVE_FILE_HEADER_MAGIC, 16) != 0 )
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return make_error_code(native_reader_error::unknown_file_format);
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// make sure mapped file contains all needed data
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const size_t fileSize = mb->getBufferSize();
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if ( header->fileSize > fileSize )
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return make_error_code(native_reader_error::file_too_short);
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// instantiate NativeFile object and add values to it as found
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NativeFile* file = new NativeFile(mb, path);
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// process each chunk
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for(uint32_t i=0; i < header->chunkCount; ++i) {
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llvm::error_code ec;
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const NativeChunk* chunk = &chunks[i];
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// sanity check chunk is within file
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if ( chunk->fileOffset > fileSize )
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return make_error_code(native_reader_error::file_malformed);
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if ( (chunk->fileOffset + chunk->fileSize) > fileSize)
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return make_error_code(native_reader_error::file_malformed);
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// process chunk, based on signature
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switch ( chunk->signature ) {
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case NCS_DefinedAtomsV1:
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ec = file->processDefinedAtomsV1(base, chunk);
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break;
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case NCS_AttributesArrayV1:
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ec = file->processAttributesV1(base, chunk);
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break;
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case NCS_UndefinedAtomsV1:
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ec = file->processUndefinedAtomsV1(base, chunk);
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break;
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case NCS_ReferencesArrayV1:
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ec = file->processReferencesV1(base, chunk);
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break;
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case NCS_TargetsTable:
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ec = file->processTargetsTable(base, chunk);
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break;
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case NCS_AddendsTable:
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ec = file->processAddendsTable(base, chunk);
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break;
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case NCS_Content:
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ec = file->processContent(base, chunk);
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break;
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case NCS_Strings:
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ec = file->processStrings(base, chunk);
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break;
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default:
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return make_error_code(native_reader_error::unknown_chunk_type);
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}
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if ( ec ) {
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delete file;
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return ec;
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}
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// TO DO: validate enough chunks were used
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result.reset(file);
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}
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return make_error_code(native_reader_error::success);
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}
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virtual ~NativeFile() {
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// _buffer is automatically deleted because of OwningPtr<>
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// All other ivar pointers are pointers into the MemoryBuffer, except
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// the _definedAtoms array which was allocated to contain an array
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// of Atom objects. The atoms have empty destructors, so it is ok
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// to just delete the memory.
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delete _definedAtoms.arrayStart;
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delete _undefinedAtoms.arrayStart;
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delete _references.arrayStart;
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delete _targetsTable;
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}
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// visits each atom in the file
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virtual bool forEachAtom(AtomHandler& handler) const {
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for(const uint8_t* p=_definedAtoms.arrayStart; p != _definedAtoms.arrayEnd;
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p += _definedAtoms.elementSize) {
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const DefinedAtom* atom = reinterpret_cast<const DefinedAtom*>(p);
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handler.doDefinedAtom(*atom);
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}
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for(const uint8_t* p=_undefinedAtoms.arrayStart; p != _undefinedAtoms.arrayEnd;
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p += _undefinedAtoms.elementSize) {
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const UndefinedAtom* atom = reinterpret_cast<const UndefinedAtom*>(p);
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handler.doUndefinedAtom(*atom);
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}
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return (_definedAtoms.arrayStart != _definedAtoms.arrayEnd);
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}
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// not used
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virtual bool justInTimeforEachAtom(llvm::StringRef name,
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AtomHandler &) const {
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return false;
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}
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private:
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friend class NativeDefinedAtomV1;
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friend class NativeUndefinedAtomV1;
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friend class NativeReferenceV1;
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// instantiate array of DefinedAtoms from v1 ivar data in file
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llvm::error_code processDefinedAtomsV1(const uint8_t* base,
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const NativeChunk* chunk) {
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const size_t atomSize = sizeof(NativeDefinedAtomV1);
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size_t atomsArraySize = chunk->elementCount * atomSize;
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uint8_t* atomsStart = reinterpret_cast<uint8_t*>
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(operator new(atomsArraySize, std::nothrow));
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if (atomsStart == NULL )
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return make_error_code(native_reader_error::memory_error);
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const size_t ivarElementSize = chunk->fileSize
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/ chunk->elementCount;
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if ( ivarElementSize != sizeof(NativeDefinedAtomIvarsV1) )
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return make_error_code(native_reader_error::file_malformed);
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uint8_t* atomsEnd = atomsStart + atomsArraySize;
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const NativeDefinedAtomIvarsV1* ivarData =
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reinterpret_cast<const NativeDefinedAtomIvarsV1*>
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(base + chunk->fileOffset);
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for(uint8_t* s = atomsStart; s != atomsEnd; s += atomSize) {
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NativeDefinedAtomV1* atomAllocSpace =
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reinterpret_cast<NativeDefinedAtomV1*>(s);
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new (atomAllocSpace) NativeDefinedAtomV1(*this, ivarData);
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++ivarData;
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}
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this->_definedAtoms.arrayStart = atomsStart;
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this->_definedAtoms.arrayEnd = atomsEnd;
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this->_definedAtoms.elementSize = atomSize;
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this->_definedAtoms.elementCount = chunk->elementCount;
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return make_error_code(native_reader_error::success);
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}
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// set up pointers to attributes array
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llvm::error_code processAttributesV1(const uint8_t* base, const NativeChunk* chunk) {
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this->_attributes = base + chunk->fileOffset;
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this->_attributesMaxOffset = chunk->fileSize;
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return make_error_code(native_reader_error::success);
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}
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llvm::error_code processUndefinedAtomsV1(const uint8_t* base,
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const NativeChunk* chunk) {
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const size_t atomSize = sizeof(NativeUndefinedAtomV1);
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size_t atomsArraySize = chunk->elementCount * atomSize;
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uint8_t* atomsStart = reinterpret_cast<uint8_t*>
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(operator new(atomsArraySize, std::nothrow));
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if (atomsStart == NULL )
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return make_error_code(native_reader_error::memory_error);
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const size_t ivarElementSize = chunk->fileSize
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/ chunk->elementCount;
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if ( ivarElementSize != sizeof(NativeUndefinedAtomIvarsV1) )
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return make_error_code(native_reader_error::file_malformed);
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uint8_t* atomsEnd = atomsStart + atomsArraySize;
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const NativeUndefinedAtomIvarsV1* ivarData =
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reinterpret_cast<const NativeUndefinedAtomIvarsV1*>
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(base + chunk->fileOffset);
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for(uint8_t* s = atomsStart; s != atomsEnd; s += atomSize) {
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NativeUndefinedAtomV1* atomAllocSpace =
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reinterpret_cast<NativeUndefinedAtomV1*>(s);
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new (atomAllocSpace) NativeUndefinedAtomV1(*this, ivarData);
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++ivarData;
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}
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this->_undefinedAtoms.arrayStart = atomsStart;
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this->_undefinedAtoms.arrayEnd = atomsEnd;
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this->_undefinedAtoms.elementSize = atomSize;
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this->_undefinedAtoms.elementCount = chunk->elementCount;
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return make_error_code(native_reader_error::success);
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}
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// instantiate array of Referemces from v1 ivar data in file
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llvm::error_code processReferencesV1(const uint8_t* base,
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const NativeChunk* chunk) {
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if ( chunk->elementCount == 0 )
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return make_error_code(native_reader_error::success);
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const size_t refSize = sizeof(NativeReferenceV1);
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size_t refsArraySize = chunk->elementCount * refSize;
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uint8_t* refsStart = reinterpret_cast<uint8_t*>
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(operator new(refsArraySize, std::nothrow));
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if (refsStart == NULL )
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return make_error_code(native_reader_error::memory_error);
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const size_t ivarElementSize = chunk->fileSize
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/ chunk->elementCount;
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if ( ivarElementSize != sizeof(NativeReferenceIvarsV1) )
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return make_error_code(native_reader_error::file_malformed);
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uint8_t* refsEnd = refsStart + refsArraySize;
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const NativeReferenceIvarsV1* ivarData =
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reinterpret_cast<const NativeReferenceIvarsV1*>
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(base + chunk->fileOffset);
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for(uint8_t* s = refsStart; s != refsEnd; s += refSize) {
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NativeReferenceV1* atomAllocSpace =
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reinterpret_cast<NativeReferenceV1*>(s);
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new (atomAllocSpace) NativeReferenceV1(*this, ivarData);
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++ivarData;
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}
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this->_references.arrayStart = refsStart;
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this->_references.arrayEnd = refsEnd;
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this->_references.elementSize = refSize;
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this->_references.elementCount = chunk->elementCount;
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return make_error_code(native_reader_error::success);
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}
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// set up pointers to target table
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llvm::error_code processTargetsTable(const uint8_t* base,
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const NativeChunk* chunk) {
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const uint32_t* targetIndexes = reinterpret_cast<const uint32_t*>
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(base + chunk->fileOffset);
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this->_targetsTableCount = chunk->elementCount;
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this->_targetsTable = new const Atom*[chunk->elementCount];
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for (uint32_t i=0; i < chunk->elementCount; ++i) {
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const uint32_t index = targetIndexes[i];
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if ( index < _definedAtoms.elementCount ) {
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const uint8_t* p = _definedAtoms.arrayStart
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+ index * _definedAtoms.elementSize;
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this->_targetsTable[i] = reinterpret_cast<const DefinedAtom*>(p);
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continue;
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}
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const uint32_t undefIndex = index - _definedAtoms.elementCount;
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if ( undefIndex < _undefinedAtoms.elementCount ) {
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const uint8_t* p = _undefinedAtoms.arrayStart
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+ undefIndex * _undefinedAtoms.elementSize;
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this->_targetsTable[i] = reinterpret_cast<const UndefinedAtom*>(p);
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continue;
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}
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return make_error_code(native_reader_error::file_malformed);
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}
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return make_error_code(native_reader_error::success);
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}
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// set up pointers to addend pool in file
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llvm::error_code processAddendsTable(const uint8_t* base,
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const NativeChunk* chunk) {
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this->_addends = reinterpret_cast<const Reference::Addend*>
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(base + chunk->fileOffset);
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this->_addendsMaxIndex = chunk->elementCount;
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return make_error_code(native_reader_error::success);
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}
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// set up pointers to string pool in file
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llvm::error_code processStrings(const uint8_t* base,
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const NativeChunk* chunk) {
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this->_strings = reinterpret_cast<const char*>(base + chunk->fileOffset);
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this->_stringsMaxOffset = chunk->fileSize;
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return make_error_code(native_reader_error::success);
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}
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// set up pointers to content area in file
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llvm::error_code processContent(const uint8_t* base,
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const NativeChunk* chunk) {
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this->_contentStart = base + chunk->fileOffset;
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this->_contentEnd = base + chunk->fileOffset + chunk->fileSize;
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return make_error_code(native_reader_error::success);
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}
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llvm::StringRef string(uint32_t offset) const {
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assert(offset < _stringsMaxOffset);
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return llvm::StringRef(&_strings[offset]);
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}
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Reference::Addend addend(uint32_t index) const {
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if ( index == 0 )
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return 0; // addend index zero is used to mean "no addend"
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assert(index <= _addendsMaxIndex);
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return _addends[index-1]; // one-based indexing
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}
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const NativeAtomAttributesV1& attribute(uint32_t off) const {
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assert(off < _attributesMaxOffset);
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return *reinterpret_cast<const NativeAtomAttributesV1*>(_attributes + off);
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}
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const uint8_t* content(uint32_t offset, uint32_t size) const {
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const uint8_t* result = _contentStart + offset;
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assert((result+size) <= _contentEnd);
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return result;
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}
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void forEachReference(DefinedAtom::ReferenceHandler& handler,
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uint32_t start, uint32_t count) const {
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assert(start < _references.elementCount);
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assert(start+count <= _references.elementCount);
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const uint8_t* arrStart = _references.arrayStart
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+ start * _references.elementSize;
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const uint8_t* arrEnd = arrStart + count * _references.elementSize;
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for(const uint8_t* p=arrStart; p != arrEnd; p += _references.elementSize) {
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const NativeReferenceV1* ref
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= reinterpret_cast<const NativeReferenceV1*>(p);
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handler.doReference(*ref);
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}
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}
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const Atom* target(uint32_t index) const {
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assert(index < _targetsTableCount);
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return _targetsTable[index];
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}
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void setTarget(uint32_t index, const Atom* newAtom) const {
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assert(index > _targetsTableCount);
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_targetsTable[index] = newAtom;
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}
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// private constructor, only called by make()
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NativeFile(llvm::OwningPtr<llvm::MemoryBuffer>& mb, llvm::StringRef path) :
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lld::File(path),
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_buffer(mb.take()), // NativeFile now takes ownership of buffer
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_header(NULL),
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_targetsTable(NULL),
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_targetsTableCount(0),
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_strings(NULL),
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_stringsMaxOffset(0),
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_addends(NULL),
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_addendsMaxIndex(0),
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_contentStart(NULL),
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_contentEnd(NULL)
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{
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_header = reinterpret_cast<const NativeFileHeader*>(_buffer->getBufferStart());
|
|
}
|
|
|
|
struct IvarArray {
|
|
IvarArray() : arrayStart(NULL), arrayEnd(NULL),
|
|
elementSize(0), elementCount(0) { }
|
|
const uint8_t* arrayStart;
|
|
const uint8_t* arrayEnd;
|
|
uint32_t elementSize;
|
|
uint32_t elementCount;
|
|
};
|
|
|
|
llvm::OwningPtr<llvm::MemoryBuffer> _buffer;
|
|
const NativeFileHeader* _header;
|
|
IvarArray _definedAtoms;
|
|
IvarArray _undefinedAtoms;
|
|
const uint8_t* _attributes;
|
|
uint32_t _attributesMaxOffset;
|
|
IvarArray _references;
|
|
const Atom** _targetsTable;
|
|
uint32_t _targetsTableCount;
|
|
const char* _strings;
|
|
uint32_t _stringsMaxOffset;
|
|
const Reference::Addend* _addends;
|
|
uint32_t _addendsMaxIndex;
|
|
const uint8_t* _contentStart;
|
|
const uint8_t* _contentEnd;
|
|
};
|
|
|
|
|
|
inline const class File& NativeDefinedAtomV1::file() const {
|
|
return *_file;
|
|
}
|
|
|
|
inline uint64_t NativeDefinedAtomV1:: ordinal() const {
|
|
const uint8_t* p = reinterpret_cast<const uint8_t*>(_ivarData);
|
|
return p - _file->_definedAtoms.arrayStart;
|
|
}
|
|
|
|
inline llvm::StringRef NativeDefinedAtomV1::name() const {
|
|
return _file->string(_ivarData->nameOffset);
|
|
}
|
|
|
|
inline const NativeAtomAttributesV1& NativeDefinedAtomV1::attributes() const {
|
|
return _file->attribute(_ivarData->attributesOffset);
|
|
}
|
|
|
|
inline llvm::ArrayRef<uint8_t> NativeDefinedAtomV1::rawContent() const {
|
|
if ( this->contentType() == DefinedAtom::typeZeroFill )
|
|
return llvm::ArrayRef<uint8_t>();
|
|
const uint8_t* p = _file->content(_ivarData->contentOffset,
|
|
_ivarData->contentSize);
|
|
return llvm::ArrayRef<uint8_t>(p, _ivarData->contentSize);
|
|
}
|
|
|
|
inline llvm::StringRef NativeDefinedAtomV1::customSectionName() const {
|
|
uint32_t offset = attributes().sectionNameOffset;
|
|
return _file->string(offset);
|
|
}
|
|
|
|
inline void NativeDefinedAtomV1::forEachReference(ReferenceHandler& hnd) const {
|
|
if ( _ivarData->referencesCount == 0 )
|
|
return;
|
|
_file->forEachReference(hnd, _ivarData->referencesStartIndex,
|
|
_ivarData->referencesCount);
|
|
}
|
|
|
|
inline const class File& NativeUndefinedAtomV1::file() const {
|
|
return *_file;
|
|
}
|
|
|
|
inline llvm::StringRef NativeUndefinedAtomV1::name() const {
|
|
return _file->string(_ivarData->nameOffset);
|
|
}
|
|
|
|
|
|
inline const Atom* NativeReferenceV1::target() const {
|
|
return _file->target(_ivarData->targetIndex);
|
|
}
|
|
|
|
inline Reference::Addend NativeReferenceV1::addend() const {
|
|
return _file->addend(_ivarData->addendIndex);
|
|
}
|
|
|
|
inline void NativeReferenceV1::setTarget(const Atom* newAtom) {
|
|
return _file->setTarget(_ivarData->targetIndex, newAtom);
|
|
}
|
|
|
|
|
|
//
|
|
// Instantiate an lld::File from the given native object file buffer
|
|
//
|
|
llvm::error_code parseNativeObjectFile(llvm::OwningPtr<llvm::MemoryBuffer>& mb,
|
|
llvm::StringRef path,
|
|
llvm::OwningPtr<File>& result) {
|
|
return NativeFile::make(mb, path, result);
|
|
}
|
|
|
|
|
|
|
|
//
|
|
// Instantiate an lld::File from the given native object file path
|
|
//
|
|
llvm::error_code parseNativeObjectFileOrSTDIN(llvm::StringRef path,
|
|
llvm::OwningPtr<File>& result) {
|
|
llvm::OwningPtr<llvm::MemoryBuffer> mb;
|
|
llvm::error_code ec = llvm::MemoryBuffer::getFileOrSTDIN(path, mb);
|
|
if ( ec )
|
|
return ec;
|
|
|
|
return parseNativeObjectFile(mb, path, result);
|
|
}
|
|
|
|
|
|
|
|
} // namespace lld
|