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ca0a1505ba
If no other operation is specified, 's' becomes an operation instead of an modifier. The s operation just creates a symbol table. It is the same as running ranlib. We assume the archive was created by a sane ar (like llvm-ar or gnu ar) and if the symbol table is present, then it is current. We use that to optimize the most common case: a broken build system that thinks it has to run ranlib. llvm-svn: 187353
451 lines
13 KiB
C++
451 lines
13 KiB
C++
//===- Archive.cpp - ar File Format implementation --------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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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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// This file defines the ArchiveObjectFile class.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Object/Archive.h"
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#include "llvm/ADT/APInt.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/ADT/Twine.h"
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#include "llvm/Support/Endian.h"
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#include "llvm/Support/MemoryBuffer.h"
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using namespace llvm;
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using namespace object;
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static const char *const Magic = "!<arch>\n";
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void Archive::anchor() { }
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StringRef ArchiveMemberHeader::getName() const {
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char EndCond;
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if (Name[0] == '/' || Name[0] == '#')
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EndCond = ' ';
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else
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EndCond = '/';
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llvm::StringRef::size_type end =
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llvm::StringRef(Name, sizeof(Name)).find(EndCond);
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if (end == llvm::StringRef::npos)
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end = sizeof(Name);
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assert(end <= sizeof(Name) && end > 0);
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// Don't include the EndCond if there is one.
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return llvm::StringRef(Name, end);
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}
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uint32_t ArchiveMemberHeader::getSize() const {
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uint32_t Ret;
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if (llvm::StringRef(Size, sizeof(Size)).rtrim(" ").getAsInteger(10, Ret))
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llvm_unreachable("Size is not a decimal number.");
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return Ret;
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}
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sys::fs::perms ArchiveMemberHeader::getAccessMode() const {
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unsigned Ret;
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if (StringRef(AccessMode, sizeof(AccessMode)).rtrim(" ").getAsInteger(8, Ret))
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llvm_unreachable("Access mode is not an octal number.");
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return static_cast<sys::fs::perms>(Ret);
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}
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sys::TimeValue ArchiveMemberHeader::getLastModified() const {
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unsigned Seconds;
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if (StringRef(LastModified, sizeof(LastModified)).rtrim(" ")
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.getAsInteger(10, Seconds))
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llvm_unreachable("Last modified time not a decimal number.");
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sys::TimeValue Ret;
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Ret.fromEpochTime(Seconds);
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return Ret;
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}
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unsigned ArchiveMemberHeader::getUID() const {
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unsigned Ret;
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if (StringRef(UID, sizeof(UID)).rtrim(" ").getAsInteger(10, Ret))
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llvm_unreachable("UID time not a decimal number.");
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return Ret;
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}
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unsigned ArchiveMemberHeader::getGID() const {
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unsigned Ret;
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if (StringRef(GID, sizeof(GID)).rtrim(" ").getAsInteger(10, Ret))
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llvm_unreachable("GID time not a decimal number.");
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return Ret;
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}
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Archive::Child::Child(const Archive *Parent, const char *Start)
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: Parent(Parent) {
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if (!Start)
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return;
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const ArchiveMemberHeader *Header =
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reinterpret_cast<const ArchiveMemberHeader *>(Start);
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Data = StringRef(Start, sizeof(ArchiveMemberHeader) + Header->getSize());
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// Setup StartOfFile and PaddingBytes.
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StartOfFile = sizeof(ArchiveMemberHeader);
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// Don't include attached name.
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StringRef Name = Header->getName();
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if (Name.startswith("#1/")) {
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uint64_t NameSize;
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if (Name.substr(3).rtrim(" ").getAsInteger(10, NameSize))
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llvm_unreachable("Long name length is not an integer");
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StartOfFile += NameSize;
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}
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}
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Archive::Child Archive::Child::getNext() const {
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size_t SpaceToSkip = Data.size();
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// If it's odd, add 1 to make it even.
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if (SpaceToSkip & 1)
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++SpaceToSkip;
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const char *NextLoc = Data.data() + SpaceToSkip;
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// Check to see if this is past the end of the archive.
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if (NextLoc >= Parent->Data->getBufferEnd())
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return Child(Parent, NULL);
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return Child(Parent, NextLoc);
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}
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error_code Archive::Child::getName(StringRef &Result) const {
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StringRef name = getRawName();
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// Check if it's a special name.
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if (name[0] == '/') {
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if (name.size() == 1) { // Linker member.
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Result = name;
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return object_error::success;
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}
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if (name.size() == 2 && name[1] == '/') { // String table.
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Result = name;
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return object_error::success;
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}
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// It's a long name.
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// Get the offset.
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std::size_t offset;
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if (name.substr(1).rtrim(" ").getAsInteger(10, offset))
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llvm_unreachable("Long name offset is not an integer");
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const char *addr = Parent->StringTable->Data.begin()
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+ sizeof(ArchiveMemberHeader)
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+ offset;
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// Verify it.
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if (Parent->StringTable == Parent->end_children()
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|| addr < (Parent->StringTable->Data.begin()
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+ sizeof(ArchiveMemberHeader))
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|| addr > (Parent->StringTable->Data.begin()
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+ sizeof(ArchiveMemberHeader)
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+ Parent->StringTable->getSize()))
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return object_error::parse_failed;
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// GNU long file names end with a /.
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if (Parent->kind() == K_GNU) {
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StringRef::size_type End = StringRef(addr).find('/');
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Result = StringRef(addr, End);
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} else {
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Result = addr;
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}
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return object_error::success;
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} else if (name.startswith("#1/")) {
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uint64_t name_size;
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if (name.substr(3).rtrim(" ").getAsInteger(10, name_size))
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llvm_unreachable("Long name length is not an ingeter");
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Result = Data.substr(sizeof(ArchiveMemberHeader), name_size)
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.rtrim(StringRef("\0", 1));
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return object_error::success;
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}
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// It's a simple name.
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if (name[name.size() - 1] == '/')
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Result = name.substr(0, name.size() - 1);
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else
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Result = name;
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return object_error::success;
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}
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error_code Archive::Child::getMemoryBuffer(OwningPtr<MemoryBuffer> &Result,
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bool FullPath) const {
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StringRef Name;
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if (error_code ec = getName(Name))
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return ec;
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SmallString<128> Path;
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Result.reset(MemoryBuffer::getMemBuffer(
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getBuffer(), FullPath ? (Twine(Parent->getFileName()) + "(" + Name + ")")
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.toStringRef(Path)
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: Name,
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false));
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return error_code::success();
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}
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error_code Archive::Child::getAsBinary(OwningPtr<Binary> &Result) const {
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OwningPtr<Binary> ret;
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OwningPtr<MemoryBuffer> Buff;
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if (error_code ec = getMemoryBuffer(Buff))
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return ec;
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if (error_code ec = createBinary(Buff.take(), ret))
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return ec;
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Result.swap(ret);
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return object_error::success;
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}
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Archive::Archive(MemoryBuffer *source, error_code &ec)
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: Binary(Binary::ID_Archive, source), SymbolTable(end_children()) {
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// Check for sufficient magic.
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assert(source);
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if (source->getBufferSize() < 8 ||
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StringRef(source->getBufferStart(), 8) != Magic) {
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ec = object_error::invalid_file_type;
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return;
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}
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// Get the special members.
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child_iterator i = begin_children(false);
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child_iterator e = end_children();
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if (i == e) {
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ec = object_error::success;
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return;
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}
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StringRef Name = i->getRawName();
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// Below is the pattern that is used to figure out the archive format
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// GNU archive format
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// First member : / (may exist, if it exists, points to the symbol table )
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// Second member : // (may exist, if it exists, points to the string table)
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// Note : The string table is used if the filename exceeds 15 characters
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// BSD archive format
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// First member : __.SYMDEF or "__.SYMDEF SORTED" (the symbol table)
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// There is no string table, if the filename exceeds 15 characters or has a
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// embedded space, the filename has #1/<size>, The size represents the size
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// of the filename that needs to be read after the archive header
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// COFF archive format
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// First member : /
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// Second member : / (provides a directory of symbols)
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// Third member : // (may exist, if it exists, contains the string table)
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// Note: Microsoft PE/COFF Spec 8.3 says that the third member is present
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// even if the string table is empty. However, lib.exe does not in fact
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// seem to create the third member if there's no member whose filename
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// exceeds 15 characters. So the third member is optional.
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if (Name == "__.SYMDEF") {
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Format = K_BSD;
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SymbolTable = i;
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++i;
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FirstRegular = i;
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ec = object_error::success;
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return;
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}
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if (Name.startswith("#1/")) {
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Format = K_BSD;
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// We know this is BSD, so getName will work since there is no string table.
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ec = i->getName(Name);
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if (ec)
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return;
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if (Name == "__.SYMDEF SORTED") {
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SymbolTable = i;
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++i;
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}
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FirstRegular = i;
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return;
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}
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if (Name == "/") {
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SymbolTable = i;
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++i;
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if (i == e) {
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ec = object_error::parse_failed;
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return;
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}
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Name = i->getRawName();
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}
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if (Name == "//") {
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Format = K_GNU;
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StringTable = i;
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++i;
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FirstRegular = i;
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ec = object_error::success;
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return;
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}
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if (Name[0] != '/') {
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Format = K_GNU;
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FirstRegular = i;
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ec = object_error::success;
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return;
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}
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if (Name != "/") {
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ec = object_error::parse_failed;
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return;
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}
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Format = K_COFF;
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SymbolTable = i;
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++i;
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if (i == e) {
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FirstRegular = i;
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ec = object_error::success;
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return;
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}
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Name = i->getRawName();
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if (Name == "//") {
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StringTable = i;
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++i;
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}
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FirstRegular = i;
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ec = object_error::success;
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}
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Archive::child_iterator Archive::begin_children(bool SkipInternal) const {
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if (Data->getBufferSize() == 8) // empty archive.
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return end_children();
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if (SkipInternal)
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return FirstRegular;
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const char *Loc = Data->getBufferStart() + strlen(Magic);
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Child c(this, Loc);
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return c;
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}
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Archive::child_iterator Archive::end_children() const {
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return Child(this, NULL);
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}
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error_code Archive::Symbol::getName(StringRef &Result) const {
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Result = StringRef(Parent->SymbolTable->getBuffer().begin() + StringIndex);
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return object_error::success;
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}
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error_code Archive::Symbol::getMember(child_iterator &Result) const {
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const char *Buf = Parent->SymbolTable->getBuffer().begin();
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const char *Offsets = Buf + 4;
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uint32_t Offset = 0;
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if (Parent->kind() == K_GNU) {
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Offset = *(reinterpret_cast<const support::ubig32_t*>(Offsets)
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+ SymbolIndex);
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} else if (Parent->kind() == K_BSD) {
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llvm_unreachable("BSD format is not supported");
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} else {
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uint32_t MemberCount = *reinterpret_cast<const support::ulittle32_t*>(Buf);
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// Skip offsets.
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Buf += sizeof(support::ulittle32_t)
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+ (MemberCount * sizeof(support::ulittle32_t));
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uint32_t SymbolCount = *reinterpret_cast<const support::ulittle32_t*>(Buf);
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if (SymbolIndex >= SymbolCount)
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return object_error::parse_failed;
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// Skip SymbolCount to get to the indices table.
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const char *Indices = Buf + sizeof(support::ulittle32_t);
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// Get the index of the offset in the file member offset table for this
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// symbol.
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uint16_t OffsetIndex =
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*(reinterpret_cast<const support::ulittle16_t*>(Indices)
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+ SymbolIndex);
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// Subtract 1 since OffsetIndex is 1 based.
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--OffsetIndex;
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if (OffsetIndex >= MemberCount)
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return object_error::parse_failed;
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Offset = *(reinterpret_cast<const support::ulittle32_t*>(Offsets)
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+ OffsetIndex);
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}
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const char *Loc = Parent->getData().begin() + Offset;
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Result = Child(Parent, Loc);
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return object_error::success;
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}
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Archive::Symbol Archive::Symbol::getNext() const {
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Symbol t(*this);
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// Go to one past next null.
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t.StringIndex =
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Parent->SymbolTable->getBuffer().find('\0', t.StringIndex) + 1;
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++t.SymbolIndex;
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return t;
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}
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Archive::symbol_iterator Archive::begin_symbols() const {
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if (!hasSymbolTable())
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return symbol_iterator(Symbol(this, 0, 0));
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const char *buf = SymbolTable->getBuffer().begin();
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if (kind() == K_GNU) {
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uint32_t symbol_count = 0;
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symbol_count = *reinterpret_cast<const support::ubig32_t*>(buf);
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buf += sizeof(uint32_t) + (symbol_count * (sizeof(uint32_t)));
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} else if (kind() == K_BSD) {
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llvm_unreachable("BSD archive format is not supported");
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} else {
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uint32_t member_count = 0;
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uint32_t symbol_count = 0;
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member_count = *reinterpret_cast<const support::ulittle32_t*>(buf);
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buf += 4 + (member_count * 4); // Skip offsets.
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symbol_count = *reinterpret_cast<const support::ulittle32_t*>(buf);
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buf += 4 + (symbol_count * 2); // Skip indices.
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}
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uint32_t string_start_offset = buf - SymbolTable->getBuffer().begin();
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return symbol_iterator(Symbol(this, 0, string_start_offset));
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}
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Archive::symbol_iterator Archive::end_symbols() const {
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if (!hasSymbolTable())
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return symbol_iterator(Symbol(this, 0, 0));
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const char *buf = SymbolTable->getBuffer().begin();
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uint32_t symbol_count = 0;
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if (kind() == K_GNU) {
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symbol_count = *reinterpret_cast<const support::ubig32_t*>(buf);
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} else if (kind() == K_BSD) {
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llvm_unreachable("BSD archive format is not supported");
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} else {
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uint32_t member_count = 0;
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member_count = *reinterpret_cast<const support::ulittle32_t*>(buf);
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buf += 4 + (member_count * 4); // Skip offsets.
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symbol_count = *reinterpret_cast<const support::ulittle32_t*>(buf);
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}
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return symbol_iterator(
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Symbol(this, symbol_count, 0));
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}
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Archive::child_iterator Archive::findSym(StringRef name) const {
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Archive::symbol_iterator bs = begin_symbols();
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Archive::symbol_iterator es = end_symbols();
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Archive::child_iterator result;
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StringRef symname;
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for (; bs != es; ++bs) {
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if (bs->getName(symname))
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return end_children();
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if (symname == name) {
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if (bs->getMember(result))
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return end_children();
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return result;
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}
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}
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return end_children();
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}
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bool Archive::hasSymbolTable() const {
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return SymbolTable != end_children();
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}
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