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llvm-mirror/lib/Object/Archive.cpp
Owen Reynolds 02991e703c [llvm-ar] Fix support for archives with members larger than 4GB 
llvm-ar outputs a strange error message when handling archives with
members larger than 4GB due to not checking file size when passing the
value as an unsigned 32 bit integer. This overflow issue caused
malformed archives to be created.:

https://bugs.llvm.org/show_bug.cgi?id=38058

This change allows for members above 4GB and will error in a case that
is over the formats size limit, a 10 digit decimal integer.

Differential Revision: https://reviews.llvm.org/D65093

llvm-svn: 366813
2019-07-23 14:44:21 +00:00

996 lines
34 KiB
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//===- Archive.cpp - ar File Format implementation ------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// This file defines the ArchiveObjectFile class.
//
//===----------------------------------------------------------------------===//
#include "llvm/Object/Archive.h"
#include "llvm/ADT/Optional.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/Twine.h"
#include "llvm/Object/Binary.h"
#include "llvm/Object/Error.h"
#include "llvm/Support/Chrono.h"
#include "llvm/Support/Endian.h"
#include "llvm/Support/Error.h"
#include "llvm/Support/ErrorOr.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <cassert>
#include <cstddef>
#include <cstdint>
#include <cstring>
#include <memory>
#include <string>
#include <system_error>
using namespace llvm;
using namespace object;
using namespace llvm::support::endian;
static const char *const Magic = "!<arch>\n";
static const char *const ThinMagic = "!<thin>\n";
void Archive::anchor() {}
static Error
malformedError(Twine Msg) {
std::string StringMsg = "truncated or malformed archive (" + Msg.str() + ")";
return make_error<GenericBinaryError>(std::move(StringMsg),
object_error::parse_failed);
}
ArchiveMemberHeader::ArchiveMemberHeader(const Archive *Parent,
const char *RawHeaderPtr,
uint64_t Size, Error *Err)
: Parent(Parent),
ArMemHdr(reinterpret_cast<const ArMemHdrType *>(RawHeaderPtr)) {
if (RawHeaderPtr == nullptr)
return;
ErrorAsOutParameter ErrAsOutParam(Err);
if (Size < sizeof(ArMemHdrType)) {
if (Err) {
std::string Msg("remaining size of archive too small for next archive "
"member header ");
Expected<StringRef> NameOrErr = getName(Size);
if (!NameOrErr) {
consumeError(NameOrErr.takeError());
uint64_t Offset = RawHeaderPtr - Parent->getData().data();
*Err = malformedError(Msg + "at offset " + Twine(Offset));
} else
*Err = malformedError(Msg + "for " + NameOrErr.get());
}
return;
}
if (ArMemHdr->Terminator[0] != '`' || ArMemHdr->Terminator[1] != '\n') {
if (Err) {
std::string Buf;
raw_string_ostream OS(Buf);
OS.write_escaped(StringRef(ArMemHdr->Terminator,
sizeof(ArMemHdr->Terminator)));
OS.flush();
std::string Msg("terminator characters in archive member \"" + Buf +
"\" not the correct \"`\\n\" values for the archive "
"member header ");
Expected<StringRef> NameOrErr = getName(Size);
if (!NameOrErr) {
consumeError(NameOrErr.takeError());
uint64_t Offset = RawHeaderPtr - Parent->getData().data();
*Err = malformedError(Msg + "at offset " + Twine(Offset));
} else
*Err = malformedError(Msg + "for " + NameOrErr.get());
}
return;
}
}
// This gets the raw name from the ArMemHdr->Name field and checks that it is
// valid for the kind of archive. If it is not valid it returns an Error.
Expected<StringRef> ArchiveMemberHeader::getRawName() const {
char EndCond;
auto Kind = Parent->kind();
if (Kind == Archive::K_BSD || Kind == Archive::K_DARWIN64) {
if (ArMemHdr->Name[0] == ' ') {
uint64_t Offset = reinterpret_cast<const char *>(ArMemHdr) -
Parent->getData().data();
return malformedError("name contains a leading space for archive member "
"header at offset " + Twine(Offset));
}
EndCond = ' ';
}
else if (ArMemHdr->Name[0] == '/' || ArMemHdr->Name[0] == '#')
EndCond = ' ';
else
EndCond = '/';
StringRef::size_type end =
StringRef(ArMemHdr->Name, sizeof(ArMemHdr->Name)).find(EndCond);
if (end == StringRef::npos)
end = sizeof(ArMemHdr->Name);
assert(end <= sizeof(ArMemHdr->Name) && end > 0);
// Don't include the EndCond if there is one.
return StringRef(ArMemHdr->Name, end);
}
// This gets the name looking up long names. Size is the size of the archive
// member including the header, so the size of any name following the header
// is checked to make sure it does not overflow.
Expected<StringRef> ArchiveMemberHeader::getName(uint64_t Size) const {
// This can be called from the ArchiveMemberHeader constructor when the
// archive header is truncated to produce an error message with the name.
// Make sure the name field is not truncated.
if (Size < offsetof(ArMemHdrType, Name) + sizeof(ArMemHdr->Name)) {
uint64_t ArchiveOffset = reinterpret_cast<const char *>(ArMemHdr) -
Parent->getData().data();
return malformedError("archive header truncated before the name field "
"for archive member header at offset " +
Twine(ArchiveOffset));
}
// The raw name itself can be invalid.
Expected<StringRef> NameOrErr = getRawName();
if (!NameOrErr)
return NameOrErr.takeError();
StringRef Name = NameOrErr.get();
// Check if it's a special name.
if (Name[0] == '/') {
if (Name.size() == 1) // Linker member.
return Name;
if (Name.size() == 2 && Name[1] == '/') // String table.
return Name;
// It's a long name.
// Get the string table offset.
std::size_t StringOffset;
if (Name.substr(1).rtrim(' ').getAsInteger(10, StringOffset)) {
std::string Buf;
raw_string_ostream OS(Buf);
OS.write_escaped(Name.substr(1).rtrim(' '));
OS.flush();
uint64_t ArchiveOffset = reinterpret_cast<const char *>(ArMemHdr) -
Parent->getData().data();
return malformedError("long name offset characters after the '/' are "
"not all decimal numbers: '" + Buf + "' for "
"archive member header at offset " +
Twine(ArchiveOffset));
}
// Verify it.
if (StringOffset >= Parent->getStringTable().size()) {
uint64_t ArchiveOffset = reinterpret_cast<const char *>(ArMemHdr) -
Parent->getData().data();
return malformedError("long name offset " + Twine(StringOffset) + " past "
"the end of the string table for archive member "
"header at offset " + Twine(ArchiveOffset));
}
// GNU long file names end with a "/\n".
if (Parent->kind() == Archive::K_GNU ||
Parent->kind() == Archive::K_GNU64) {
size_t End = Parent->getStringTable().find('\n', /*From=*/StringOffset);
if (End == StringRef::npos || End < 1 ||
Parent->getStringTable()[End - 1] != '/') {
return malformedError("string table at long name offset " +
Twine(StringOffset) + "not terminated");
}
return Parent->getStringTable().slice(StringOffset, End - 1);
}
return Parent->getStringTable().begin() + StringOffset;
}
if (Name.startswith("#1/")) {
uint64_t NameLength;
if (Name.substr(3).rtrim(' ').getAsInteger(10, NameLength)) {
std::string Buf;
raw_string_ostream OS(Buf);
OS.write_escaped(Name.substr(3).rtrim(' '));
OS.flush();
uint64_t ArchiveOffset = reinterpret_cast<const char *>(ArMemHdr) -
Parent->getData().data();
return malformedError("long name length characters after the #1/ are "
"not all decimal numbers: '" + Buf + "' for "
"archive member header at offset " +
Twine(ArchiveOffset));
}
if (getSizeOf() + NameLength > Size) {
uint64_t ArchiveOffset = reinterpret_cast<const char *>(ArMemHdr) -
Parent->getData().data();
return malformedError("long name length: " + Twine(NameLength) +
" extends past the end of the member or archive "
"for archive member header at offset " +
Twine(ArchiveOffset));
}
return StringRef(reinterpret_cast<const char *>(ArMemHdr) + getSizeOf(),
NameLength).rtrim('\0');
}
// It is not a long name so trim the blanks at the end of the name.
if (Name[Name.size() - 1] != '/')
return Name.rtrim(' ');
// It's a simple name.
return Name.drop_back(1);
}
Expected<uint64_t> ArchiveMemberHeader::getSize() const {
uint64_t Ret;
if (StringRef(ArMemHdr->Size,
sizeof(ArMemHdr->Size)).rtrim(" ").getAsInteger(10, Ret)) {
std::string Buf;
raw_string_ostream OS(Buf);
OS.write_escaped(StringRef(ArMemHdr->Size,
sizeof(ArMemHdr->Size)).rtrim(" "));
OS.flush();
uint64_t Offset = reinterpret_cast<const char *>(ArMemHdr) -
Parent->getData().data();
return malformedError("characters in size field in archive header are not "
"all decimal numbers: '" + Buf + "' for archive "
"member header at offset " + Twine(Offset));
}
return Ret;
}
Expected<sys::fs::perms> ArchiveMemberHeader::getAccessMode() const {
unsigned Ret;
if (StringRef(ArMemHdr->AccessMode,
sizeof(ArMemHdr->AccessMode)).rtrim(' ').getAsInteger(8, Ret)) {
std::string Buf;
raw_string_ostream OS(Buf);
OS.write_escaped(StringRef(ArMemHdr->AccessMode,
sizeof(ArMemHdr->AccessMode)).rtrim(" "));
OS.flush();
uint64_t Offset = reinterpret_cast<const char *>(ArMemHdr) -
Parent->getData().data();
return malformedError("characters in AccessMode field in archive header "
"are not all decimal numbers: '" + Buf + "' for the "
"archive member header at offset " + Twine(Offset));
}
return static_cast<sys::fs::perms>(Ret);
}
Expected<sys::TimePoint<std::chrono::seconds>>
ArchiveMemberHeader::getLastModified() const {
unsigned Seconds;
if (StringRef(ArMemHdr->LastModified,
sizeof(ArMemHdr->LastModified)).rtrim(' ')
.getAsInteger(10, Seconds)) {
std::string Buf;
raw_string_ostream OS(Buf);
OS.write_escaped(StringRef(ArMemHdr->LastModified,
sizeof(ArMemHdr->LastModified)).rtrim(" "));
OS.flush();
uint64_t Offset = reinterpret_cast<const char *>(ArMemHdr) -
Parent->getData().data();
return malformedError("characters in LastModified field in archive header "
"are not all decimal numbers: '" + Buf + "' for the "
"archive member header at offset " + Twine(Offset));
}
return sys::toTimePoint(Seconds);
}
Expected<unsigned> ArchiveMemberHeader::getUID() const {
unsigned Ret;
StringRef User = StringRef(ArMemHdr->UID, sizeof(ArMemHdr->UID)).rtrim(' ');
if (User.empty())
return 0;
if (User.getAsInteger(10, Ret)) {
std::string Buf;
raw_string_ostream OS(Buf);
OS.write_escaped(User);
OS.flush();
uint64_t Offset = reinterpret_cast<const char *>(ArMemHdr) -
Parent->getData().data();
return malformedError("characters in UID field in archive header "
"are not all decimal numbers: '" + Buf + "' for the "
"archive member header at offset " + Twine(Offset));
}
return Ret;
}
Expected<unsigned> ArchiveMemberHeader::getGID() const {
unsigned Ret;
StringRef Group = StringRef(ArMemHdr->GID, sizeof(ArMemHdr->GID)).rtrim(' ');
if (Group.empty())
return 0;
if (Group.getAsInteger(10, Ret)) {
std::string Buf;
raw_string_ostream OS(Buf);
OS.write_escaped(Group);
OS.flush();
uint64_t Offset = reinterpret_cast<const char *>(ArMemHdr) -
Parent->getData().data();
return malformedError("characters in GID field in archive header "
"are not all decimal numbers: '" + Buf + "' for the "
"archive member header at offset " + Twine(Offset));
}
return Ret;
}
Archive::Child::Child(const Archive *Parent, StringRef Data,
uint16_t StartOfFile)
: Parent(Parent), Header(Parent, Data.data(), Data.size(), nullptr),
Data(Data), StartOfFile(StartOfFile) {
}
Archive::Child::Child(const Archive *Parent, const char *Start, Error *Err)
: Parent(Parent),
Header(Parent, Start,
Parent
? Parent->getData().size() - (Start - Parent->getData().data())
: 0, Err) {
if (!Start)
return;
// If we are pointed to real data, Start is not a nullptr, then there must be
// a non-null Err pointer available to report malformed data on. Only in
// the case sentinel value is being constructed is Err is permitted to be a
// nullptr.
assert(Err && "Err can't be nullptr if Start is not a nullptr");
ErrorAsOutParameter ErrAsOutParam(Err);
// If there was an error in the construction of the Header
// then just return with the error now set.
if (*Err)
return;
uint64_t Size = Header.getSizeOf();
Data = StringRef(Start, Size);
Expected<bool> isThinOrErr = isThinMember();
if (!isThinOrErr) {
*Err = isThinOrErr.takeError();
return;
}
bool isThin = isThinOrErr.get();
if (!isThin) {
Expected<uint64_t> MemberSize = getRawSize();
if (!MemberSize) {
*Err = MemberSize.takeError();
return;
}
Size += MemberSize.get();
Data = StringRef(Start, Size);
}
// Setup StartOfFile and PaddingBytes.
StartOfFile = Header.getSizeOf();
// Don't include attached name.
Expected<StringRef> NameOrErr = getRawName();
if (!NameOrErr){
*Err = NameOrErr.takeError();
return;
}
StringRef Name = NameOrErr.get();
if (Name.startswith("#1/")) {
uint64_t NameSize;
if (Name.substr(3).rtrim(' ').getAsInteger(10, NameSize)) {
std::string Buf;
raw_string_ostream OS(Buf);
OS.write_escaped(Name.substr(3).rtrim(' '));
OS.flush();
uint64_t Offset = Start - Parent->getData().data();
*Err = malformedError("long name length characters after the #1/ are "
"not all decimal numbers: '" + Buf + "' for "
"archive member header at offset " +
Twine(Offset));
return;
}
StartOfFile += NameSize;
}
}
Expected<uint64_t> Archive::Child::getSize() const {
if (Parent->IsThin) {
Expected<uint32_t> Size = Header.getSize();
if (!Size)
return Size.takeError();
return Size.get();
}
return Data.size() - StartOfFile;
}
Expected<uint64_t> Archive::Child::getRawSize() const {
return Header.getSize();
}
Expected<bool> Archive::Child::isThinMember() const {
Expected<StringRef> NameOrErr = Header.getRawName();
if (!NameOrErr)
return NameOrErr.takeError();
StringRef Name = NameOrErr.get();
return Parent->IsThin && Name != "/" && Name != "//";
}
Expected<std::string> Archive::Child::getFullName() const {
Expected<bool> isThin = isThinMember();
if (!isThin)
return isThin.takeError();
assert(isThin.get());
Expected<StringRef> NameOrErr = getName();
if (!NameOrErr)
return NameOrErr.takeError();
StringRef Name = *NameOrErr;
if (sys::path::is_absolute(Name))
return Name;
SmallString<128> FullName = sys::path::parent_path(
Parent->getMemoryBufferRef().getBufferIdentifier());
sys::path::append(FullName, Name);
return StringRef(FullName);
}
Expected<StringRef> Archive::Child::getBuffer() const {
Expected<bool> isThinOrErr = isThinMember();
if (!isThinOrErr)
return isThinOrErr.takeError();
bool isThin = isThinOrErr.get();
if (!isThin) {
Expected<uint32_t> Size = getSize();
if (!Size)
return Size.takeError();
return StringRef(Data.data() + StartOfFile, Size.get());
}
Expected<std::string> FullNameOrErr = getFullName();
if (!FullNameOrErr)
return FullNameOrErr.takeError();
const std::string &FullName = *FullNameOrErr;
ErrorOr<std::unique_ptr<MemoryBuffer>> Buf = MemoryBuffer::getFile(FullName);
if (std::error_code EC = Buf.getError())
return errorCodeToError(EC);
Parent->ThinBuffers.push_back(std::move(*Buf));
return Parent->ThinBuffers.back()->getBuffer();
}
Expected<Archive::Child> Archive::Child::getNext() const {
size_t SpaceToSkip = Data.size();
// If it's odd, add 1 to make it even.
if (SpaceToSkip & 1)
++SpaceToSkip;
const char *NextLoc = Data.data() + SpaceToSkip;
// Check to see if this is at the end of the archive.
if (NextLoc == Parent->Data.getBufferEnd())
return Child(nullptr, nullptr, nullptr);
// Check to see if this is past the end of the archive.
if (NextLoc > Parent->Data.getBufferEnd()) {
std::string Msg("offset to next archive member past the end of the archive "
"after member ");
Expected<StringRef> NameOrErr = getName();
if (!NameOrErr) {
consumeError(NameOrErr.takeError());
uint64_t Offset = Data.data() - Parent->getData().data();
return malformedError(Msg + "at offset " + Twine(Offset));
} else
return malformedError(Msg + NameOrErr.get());
}
Error Err = Error::success();
Child Ret(Parent, NextLoc, &Err);
if (Err)
return std::move(Err);
return Ret;
}
uint64_t Archive::Child::getChildOffset() const {
const char *a = Parent->Data.getBuffer().data();
const char *c = Data.data();
uint64_t offset = c - a;
return offset;
}
Expected<StringRef> Archive::Child::getName() const {
Expected<uint64_t> RawSizeOrErr = getRawSize();
if (!RawSizeOrErr)
return RawSizeOrErr.takeError();
uint64_t RawSize = RawSizeOrErr.get();
Expected<StringRef> NameOrErr = Header.getName(Header.getSizeOf() + RawSize);
if (!NameOrErr)
return NameOrErr.takeError();
StringRef Name = NameOrErr.get();
return Name;
}
Expected<MemoryBufferRef> Archive::Child::getMemoryBufferRef() const {
Expected<StringRef> NameOrErr = getName();
if (!NameOrErr)
return NameOrErr.takeError();
StringRef Name = NameOrErr.get();
Expected<StringRef> Buf = getBuffer();
if (!Buf)
return createFileError(Name, Buf.takeError());
return MemoryBufferRef(*Buf, Name);
}
Expected<std::unique_ptr<Binary>>
Archive::Child::getAsBinary(LLVMContext *Context) const {
Expected<MemoryBufferRef> BuffOrErr = getMemoryBufferRef();
if (!BuffOrErr)
return BuffOrErr.takeError();
auto BinaryOrErr = createBinary(BuffOrErr.get(), Context);
if (BinaryOrErr)
return std::move(*BinaryOrErr);
return BinaryOrErr.takeError();
}
Expected<std::unique_ptr<Archive>> Archive::create(MemoryBufferRef Source) {
Error Err = Error::success();
std::unique_ptr<Archive> Ret(new Archive(Source, Err));
if (Err)
return std::move(Err);
return std::move(Ret);
}
void Archive::setFirstRegular(const Child &C) {
FirstRegularData = C.Data;
FirstRegularStartOfFile = C.StartOfFile;
}
Archive::Archive(MemoryBufferRef Source, Error &Err)
: Binary(Binary::ID_Archive, Source) {
ErrorAsOutParameter ErrAsOutParam(&Err);
StringRef Buffer = Data.getBuffer();
// Check for sufficient magic.
if (Buffer.startswith(ThinMagic)) {
IsThin = true;
} else if (Buffer.startswith(Magic)) {
IsThin = false;
} else {
Err = make_error<GenericBinaryError>("File too small to be an archive",
object_error::invalid_file_type);
return;
}
// Make sure Format is initialized before any call to
// ArchiveMemberHeader::getName() is made. This could be a valid empty
// archive which is the same in all formats. So claiming it to be gnu to is
// fine if not totally correct before we look for a string table or table of
// contents.
Format = K_GNU;
// Get the special members.
child_iterator I = child_begin(Err, false);
if (Err)
return;
child_iterator E = child_end();
// See if this is a valid empty archive and if so return.
if (I == E) {
Err = Error::success();
return;
}
const Child *C = &*I;
auto Increment = [&]() {
++I;
if (Err)
return true;
C = &*I;
return false;
};
Expected<StringRef> NameOrErr = C->getRawName();
if (!NameOrErr) {
Err = NameOrErr.takeError();
return;
}
StringRef Name = NameOrErr.get();
// Below is the pattern that is used to figure out the archive format
// GNU archive format
// First member : / (may exist, if it exists, points to the symbol table )
// Second member : // (may exist, if it exists, points to the string table)
// Note : The string table is used if the filename exceeds 15 characters
// BSD archive format
// First member : __.SYMDEF or "__.SYMDEF SORTED" (the symbol table)
// There is no string table, if the filename exceeds 15 characters or has a
// embedded space, the filename has #1/<size>, The size represents the size
// of the filename that needs to be read after the archive header
// COFF archive format
// First member : /
// Second member : / (provides a directory of symbols)
// Third member : // (may exist, if it exists, contains the string table)
// Note: Microsoft PE/COFF Spec 8.3 says that the third member is present
// even if the string table is empty. However, lib.exe does not in fact
// seem to create the third member if there's no member whose filename
// exceeds 15 characters. So the third member is optional.
if (Name == "__.SYMDEF" || Name == "__.SYMDEF_64") {
if (Name == "__.SYMDEF")
Format = K_BSD;
else // Name == "__.SYMDEF_64"
Format = K_DARWIN64;
// We know that the symbol table is not an external file, but we still must
// check any Expected<> return value.
Expected<StringRef> BufOrErr = C->getBuffer();
if (!BufOrErr) {
Err = BufOrErr.takeError();
return;
}
SymbolTable = BufOrErr.get();
if (Increment())
return;
setFirstRegular(*C);
Err = Error::success();
return;
}
if (Name.startswith("#1/")) {
Format = K_BSD;
// We know this is BSD, so getName will work since there is no string table.
Expected<StringRef> NameOrErr = C->getName();
if (!NameOrErr) {
Err = NameOrErr.takeError();
return;
}
Name = NameOrErr.get();
if (Name == "__.SYMDEF SORTED" || Name == "__.SYMDEF") {
// We know that the symbol table is not an external file, but we still
// must check any Expected<> return value.
Expected<StringRef> BufOrErr = C->getBuffer();
if (!BufOrErr) {
Err = BufOrErr.takeError();
return;
}
SymbolTable = BufOrErr.get();
if (Increment())
return;
}
else if (Name == "__.SYMDEF_64 SORTED" || Name == "__.SYMDEF_64") {
Format = K_DARWIN64;
// We know that the symbol table is not an external file, but we still
// must check any Expected<> return value.
Expected<StringRef> BufOrErr = C->getBuffer();
if (!BufOrErr) {
Err = BufOrErr.takeError();
return;
}
SymbolTable = BufOrErr.get();
if (Increment())
return;
}
setFirstRegular(*C);
return;
}
// MIPS 64-bit ELF archives use a special format of a symbol table.
// This format is marked by `ar_name` field equals to "/SYM64/".
// For detailed description see page 96 in the following document:
// http://techpubs.sgi.com/library/manuals/4000/007-4658-001/pdf/007-4658-001.pdf
bool has64SymTable = false;
if (Name == "/" || Name == "/SYM64/") {
// We know that the symbol table is not an external file, but we still
// must check any Expected<> return value.
Expected<StringRef> BufOrErr = C->getBuffer();
if (!BufOrErr) {
Err = BufOrErr.takeError();
return;
}
SymbolTable = BufOrErr.get();
if (Name == "/SYM64/")
has64SymTable = true;
if (Increment())
return;
if (I == E) {
Err = Error::success();
return;
}
Expected<StringRef> NameOrErr = C->getRawName();
if (!NameOrErr) {
Err = NameOrErr.takeError();
return;
}
Name = NameOrErr.get();
}
if (Name == "//") {
Format = has64SymTable ? K_GNU64 : K_GNU;
// The string table is never an external member, but we still
// must check any Expected<> return value.
Expected<StringRef> BufOrErr = C->getBuffer();
if (!BufOrErr) {
Err = BufOrErr.takeError();
return;
}
StringTable = BufOrErr.get();
if (Increment())
return;
setFirstRegular(*C);
Err = Error::success();
return;
}
if (Name[0] != '/') {
Format = has64SymTable ? K_GNU64 : K_GNU;
setFirstRegular(*C);
Err = Error::success();
return;
}
if (Name != "/") {
Err = errorCodeToError(object_error::parse_failed);
return;
}
Format = K_COFF;
// We know that the symbol table is not an external file, but we still
// must check any Expected<> return value.
Expected<StringRef> BufOrErr = C->getBuffer();
if (!BufOrErr) {
Err = BufOrErr.takeError();
return;
}
SymbolTable = BufOrErr.get();
if (Increment())
return;
if (I == E) {
setFirstRegular(*C);
Err = Error::success();
return;
}
NameOrErr = C->getRawName();
if (!NameOrErr) {
Err = NameOrErr.takeError();
return;
}
Name = NameOrErr.get();
if (Name == "//") {
// The string table is never an external member, but we still
// must check any Expected<> return value.
Expected<StringRef> BufOrErr = C->getBuffer();
if (!BufOrErr) {
Err = BufOrErr.takeError();
return;
}
StringTable = BufOrErr.get();
if (Increment())
return;
}
setFirstRegular(*C);
Err = Error::success();
}
Archive::child_iterator Archive::child_begin(Error &Err,
bool SkipInternal) const {
if (isEmpty())
return child_end();
if (SkipInternal)
return child_iterator::itr(
Child(this, FirstRegularData, FirstRegularStartOfFile), Err);
const char *Loc = Data.getBufferStart() + strlen(Magic);
Child C(this, Loc, &Err);
if (Err)
return child_end();
return child_iterator::itr(C, Err);
}
Archive::child_iterator Archive::child_end() const {
return child_iterator::end(Child(nullptr, nullptr, nullptr));
}
StringRef Archive::Symbol::getName() const {
return Parent->getSymbolTable().begin() + StringIndex;
}
Expected<Archive::Child> Archive::Symbol::getMember() const {
const char *Buf = Parent->getSymbolTable().begin();
const char *Offsets = Buf;
if (Parent->kind() == K_GNU64 || Parent->kind() == K_DARWIN64)
Offsets += sizeof(uint64_t);
else
Offsets += sizeof(uint32_t);
uint64_t Offset = 0;
if (Parent->kind() == K_GNU) {
Offset = read32be(Offsets + SymbolIndex * 4);
} else if (Parent->kind() == K_GNU64) {
Offset = read64be(Offsets + SymbolIndex * 8);
} else if (Parent->kind() == K_BSD) {
// The SymbolIndex is an index into the ranlib structs that start at
// Offsets (the first uint32_t is the number of bytes of the ranlib
// structs). The ranlib structs are a pair of uint32_t's the first
// being a string table offset and the second being the offset into
// the archive of the member that defines the symbol. Which is what
// is needed here.
Offset = read32le(Offsets + SymbolIndex * 8 + 4);
} else if (Parent->kind() == K_DARWIN64) {
// The SymbolIndex is an index into the ranlib_64 structs that start at
// Offsets (the first uint64_t is the number of bytes of the ranlib_64
// structs). The ranlib_64 structs are a pair of uint64_t's the first
// being a string table offset and the second being the offset into
// the archive of the member that defines the symbol. Which is what
// is needed here.
Offset = read64le(Offsets + SymbolIndex * 16 + 8);
} else {
// Skip offsets.
uint32_t MemberCount = read32le(Buf);
Buf += MemberCount * 4 + 4;
uint32_t SymbolCount = read32le(Buf);
if (SymbolIndex >= SymbolCount)
return errorCodeToError(object_error::parse_failed);
// Skip SymbolCount to get to the indices table.
const char *Indices = Buf + 4;
// Get the index of the offset in the file member offset table for this
// symbol.
uint16_t OffsetIndex = read16le(Indices + SymbolIndex * 2);
// Subtract 1 since OffsetIndex is 1 based.
--OffsetIndex;
if (OffsetIndex >= MemberCount)
return errorCodeToError(object_error::parse_failed);
Offset = read32le(Offsets + OffsetIndex * 4);
}
const char *Loc = Parent->getData().begin() + Offset;
Error Err = Error::success();
Child C(Parent, Loc, &Err);
if (Err)
return std::move(Err);
return C;
}
Archive::Symbol Archive::Symbol::getNext() const {
Symbol t(*this);
if (Parent->kind() == K_BSD) {
// t.StringIndex is an offset from the start of the __.SYMDEF or
// "__.SYMDEF SORTED" member into the string table for the ranlib
// struct indexed by t.SymbolIndex . To change t.StringIndex to the
// offset in the string table for t.SymbolIndex+1 we subtract the
// its offset from the start of the string table for t.SymbolIndex
// and add the offset of the string table for t.SymbolIndex+1.
// The __.SYMDEF or "__.SYMDEF SORTED" member starts with a uint32_t
// which is the number of bytes of ranlib structs that follow. The ranlib
// structs are a pair of uint32_t's the first being a string table offset
// and the second being the offset into the archive of the member that
// define the symbol. After that the next uint32_t is the byte count of
// the string table followed by the string table.
const char *Buf = Parent->getSymbolTable().begin();
uint32_t RanlibCount = 0;
RanlibCount = read32le(Buf) / 8;
// If t.SymbolIndex + 1 will be past the count of symbols (the RanlibCount)
// don't change the t.StringIndex as we don't want to reference a ranlib
// past RanlibCount.
if (t.SymbolIndex + 1 < RanlibCount) {
const char *Ranlibs = Buf + 4;
uint32_t CurRanStrx = 0;
uint32_t NextRanStrx = 0;
CurRanStrx = read32le(Ranlibs + t.SymbolIndex * 8);
NextRanStrx = read32le(Ranlibs + (t.SymbolIndex + 1) * 8);
t.StringIndex -= CurRanStrx;
t.StringIndex += NextRanStrx;
}
} else {
// Go to one past next null.
t.StringIndex = Parent->getSymbolTable().find('\0', t.StringIndex) + 1;
}
++t.SymbolIndex;
return t;
}
Archive::symbol_iterator Archive::symbol_begin() const {
if (!hasSymbolTable())
return symbol_iterator(Symbol(this, 0, 0));
const char *buf = getSymbolTable().begin();
if (kind() == K_GNU) {
uint32_t symbol_count = 0;
symbol_count = read32be(buf);
buf += sizeof(uint32_t) + (symbol_count * (sizeof(uint32_t)));
} else if (kind() == K_GNU64) {
uint64_t symbol_count = read64be(buf);
buf += sizeof(uint64_t) + (symbol_count * (sizeof(uint64_t)));
} else if (kind() == K_BSD) {
// The __.SYMDEF or "__.SYMDEF SORTED" member starts with a uint32_t
// which is the number of bytes of ranlib structs that follow. The ranlib
// structs are a pair of uint32_t's the first being a string table offset
// and the second being the offset into the archive of the member that
// define the symbol. After that the next uint32_t is the byte count of
// the string table followed by the string table.
uint32_t ranlib_count = 0;
ranlib_count = read32le(buf) / 8;
const char *ranlibs = buf + 4;
uint32_t ran_strx = 0;
ran_strx = read32le(ranlibs);
buf += sizeof(uint32_t) + (ranlib_count * (2 * (sizeof(uint32_t))));
// Skip the byte count of the string table.
buf += sizeof(uint32_t);
buf += ran_strx;
} else if (kind() == K_DARWIN64) {
// The __.SYMDEF_64 or "__.SYMDEF_64 SORTED" member starts with a uint64_t
// which is the number of bytes of ranlib_64 structs that follow. The
// ranlib_64 structs are a pair of uint64_t's the first being a string
// table offset and the second being the offset into the archive of the
// member that define the symbol. After that the next uint64_t is the byte
// count of the string table followed by the string table.
uint64_t ranlib_count = 0;
ranlib_count = read64le(buf) / 16;
const char *ranlibs = buf + 8;
uint64_t ran_strx = 0;
ran_strx = read64le(ranlibs);
buf += sizeof(uint64_t) + (ranlib_count * (2 * (sizeof(uint64_t))));
// Skip the byte count of the string table.
buf += sizeof(uint64_t);
buf += ran_strx;
} else {
uint32_t member_count = 0;
uint32_t symbol_count = 0;
member_count = read32le(buf);
buf += 4 + (member_count * 4); // Skip offsets.
symbol_count = read32le(buf);
buf += 4 + (symbol_count * 2); // Skip indices.
}
uint32_t string_start_offset = buf - getSymbolTable().begin();
return symbol_iterator(Symbol(this, 0, string_start_offset));
}
Archive::symbol_iterator Archive::symbol_end() const {
return symbol_iterator(Symbol(this, getNumberOfSymbols(), 0));
}
uint32_t Archive::getNumberOfSymbols() const {
if (!hasSymbolTable())
return 0;
const char *buf = getSymbolTable().begin();
if (kind() == K_GNU)
return read32be(buf);
if (kind() == K_GNU64)
return read64be(buf);
if (kind() == K_BSD)
return read32le(buf) / 8;
if (kind() == K_DARWIN64)
return read64le(buf) / 16;
uint32_t member_count = 0;
member_count = read32le(buf);
buf += 4 + (member_count * 4); // Skip offsets.
return read32le(buf);
}
Expected<Optional<Archive::Child>> Archive::findSym(StringRef name) const {
Archive::symbol_iterator bs = symbol_begin();
Archive::symbol_iterator es = symbol_end();
for (; bs != es; ++bs) {
StringRef SymName = bs->getName();
if (SymName == name) {
if (auto MemberOrErr = bs->getMember())
return Child(*MemberOrErr);
else
return MemberOrErr.takeError();
}
}
return Optional<Child>();
}
// Returns true if archive file contains no member file.
bool Archive::isEmpty() const { return Data.getBufferSize() == 8; }
bool Archive::hasSymbolTable() const { return !SymbolTable.empty(); }
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