mirror of
https://github.com/c64scene-ar/llvm-6502.git
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ba7661d294
We were storing both the path and the file name, which was redundant and easy to get confused up with. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@242347 91177308-0d34-0410-b5e6-96231b3b80d8
412 lines
14 KiB
C++
412 lines
14 KiB
C++
//===- ArchiveWriter.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 writeArchive function.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Object/ArchiveWriter.h"
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/IR/LLVMContext.h"
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#include "llvm/Object/Archive.h"
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#include "llvm/Object/ObjectFile.h"
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#include "llvm/Object/SymbolicFile.h"
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#include "llvm/Support/EndianStream.h"
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#include "llvm/Support/Errc.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/Format.h"
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#include "llvm/Support/Path.h"
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#include "llvm/Support/ToolOutputFile.h"
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#include "llvm/Support/raw_ostream.h"
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#if !defined(_MSC_VER) && !defined(__MINGW32__)
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#include <unistd.h>
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#else
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#include <io.h>
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#endif
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using namespace llvm;
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NewArchiveIterator::NewArchiveIterator(object::Archive::child_iterator I,
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StringRef Name)
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: IsNewMember(false), Name(Name), OldI(I) {}
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NewArchiveIterator::NewArchiveIterator(StringRef FileName)
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: IsNewMember(true), Name(FileName) {}
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StringRef NewArchiveIterator::getName() const { return Name; }
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bool NewArchiveIterator::isNewMember() const { return IsNewMember; }
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object::Archive::child_iterator NewArchiveIterator::getOld() const {
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assert(!IsNewMember);
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return OldI;
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}
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StringRef NewArchiveIterator::getNew() const {
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assert(IsNewMember);
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return Name;
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}
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llvm::ErrorOr<int>
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NewArchiveIterator::getFD(sys::fs::file_status &NewStatus) const {
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assert(IsNewMember);
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int NewFD;
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if (auto EC = sys::fs::openFileForRead(Name, NewFD))
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return EC;
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assert(NewFD != -1);
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if (auto EC = sys::fs::status(NewFD, NewStatus))
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return EC;
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// Opening a directory doesn't make sense. Let it fail.
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// Linux cannot open directories with open(2), although
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// cygwin and *bsd can.
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if (NewStatus.type() == sys::fs::file_type::directory_file)
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return make_error_code(errc::is_a_directory);
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return NewFD;
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}
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template <typename T>
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static void printWithSpacePadding(raw_fd_ostream &OS, T Data, unsigned Size,
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bool MayTruncate = false) {
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uint64_t OldPos = OS.tell();
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OS << Data;
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unsigned SizeSoFar = OS.tell() - OldPos;
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if (Size > SizeSoFar) {
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OS.indent(Size - SizeSoFar);
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} else if (Size < SizeSoFar) {
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assert(MayTruncate && "Data doesn't fit in Size");
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// Some of the data this is used for (like UID) can be larger than the
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// space available in the archive format. Truncate in that case.
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OS.seek(OldPos + Size);
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}
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}
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static void print32(raw_ostream &Out, object::Archive::Kind Kind,
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uint32_t Val) {
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if (Kind == object::Archive::K_GNU)
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support::endian::Writer<support::big>(Out).write(Val);
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else
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support::endian::Writer<support::little>(Out).write(Val);
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}
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static void printRestOfMemberHeader(raw_fd_ostream &Out,
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const sys::TimeValue &ModTime, unsigned UID,
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unsigned GID, unsigned Perms,
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unsigned Size) {
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printWithSpacePadding(Out, ModTime.toEpochTime(), 12);
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printWithSpacePadding(Out, UID, 6, true);
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printWithSpacePadding(Out, GID, 6, true);
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printWithSpacePadding(Out, format("%o", Perms), 8);
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printWithSpacePadding(Out, Size, 10);
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Out << "`\n";
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}
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static void printGNUSmallMemberHeader(raw_fd_ostream &Out, StringRef Name,
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const sys::TimeValue &ModTime,
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unsigned UID, unsigned GID,
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unsigned Perms, unsigned Size) {
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printWithSpacePadding(Out, Twine(Name) + "/", 16);
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printRestOfMemberHeader(Out, ModTime, UID, GID, Perms, Size);
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}
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static void printBSDMemberHeader(raw_fd_ostream &Out, StringRef Name,
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const sys::TimeValue &ModTime, unsigned UID,
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unsigned GID, unsigned Perms, unsigned Size) {
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uint64_t PosAfterHeader = Out.tell() + 60 + Name.size();
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// Pad so that even 64 bit object files are aligned.
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unsigned Pad = OffsetToAlignment(PosAfterHeader, 8);
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unsigned NameWithPadding = Name.size() + Pad;
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printWithSpacePadding(Out, Twine("#1/") + Twine(NameWithPadding), 16);
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printRestOfMemberHeader(Out, ModTime, UID, GID, Perms,
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NameWithPadding + Size);
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Out << Name;
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assert(PosAfterHeader == Out.tell());
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while (Pad--)
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Out.write(uint8_t(0));
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}
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static bool useStringTable(bool Thin, StringRef Name) {
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return Thin || Name.size() >= 16;
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}
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static void
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printMemberHeader(raw_fd_ostream &Out, object::Archive::Kind Kind, bool Thin,
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StringRef Name,
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std::vector<unsigned>::iterator &StringMapIndexIter,
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const sys::TimeValue &ModTime, unsigned UID, unsigned GID,
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unsigned Perms, unsigned Size) {
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if (Kind == object::Archive::K_BSD)
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return printBSDMemberHeader(Out, Name, ModTime, UID, GID, Perms, Size);
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if (!useStringTable(Thin, Name))
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return printGNUSmallMemberHeader(Out, Name, ModTime, UID, GID, Perms, Size);
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Out << '/';
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printWithSpacePadding(Out, *StringMapIndexIter++, 15);
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printRestOfMemberHeader(Out, ModTime, UID, GID, Perms, Size);
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}
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static void writeStringTable(raw_fd_ostream &Out,
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ArrayRef<NewArchiveIterator> Members,
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std::vector<unsigned> &StringMapIndexes,
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bool Thin) {
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unsigned StartOffset = 0;
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for (const NewArchiveIterator &I : Members) {
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StringRef Name = I.getName();
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if (!useStringTable(Thin, Name))
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continue;
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if (StartOffset == 0) {
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printWithSpacePadding(Out, "//", 58);
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Out << "`\n";
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StartOffset = Out.tell();
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}
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StringMapIndexes.push_back(Out.tell() - StartOffset);
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Out << Name << "/\n";
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}
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if (StartOffset == 0)
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return;
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if (Out.tell() % 2)
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Out << '\n';
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int Pos = Out.tell();
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Out.seek(StartOffset - 12);
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printWithSpacePadding(Out, Pos - StartOffset, 10);
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Out.seek(Pos);
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}
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static sys::TimeValue now(bool Deterministic) {
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if (!Deterministic)
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return sys::TimeValue::now();
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sys::TimeValue TV;
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TV.fromEpochTime(0);
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return TV;
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}
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// Returns the offset of the first reference to a member offset.
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static ErrorOr<unsigned>
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writeSymbolTable(raw_fd_ostream &Out, object::Archive::Kind Kind,
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ArrayRef<NewArchiveIterator> Members,
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ArrayRef<MemoryBufferRef> Buffers,
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std::vector<unsigned> &MemberOffsetRefs, bool Deterministic) {
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unsigned HeaderStartOffset = 0;
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unsigned BodyStartOffset = 0;
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SmallString<128> NameBuf;
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raw_svector_ostream NameOS(NameBuf);
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LLVMContext Context;
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for (unsigned MemberNum = 0, N = Members.size(); MemberNum < N; ++MemberNum) {
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MemoryBufferRef MemberBuffer = Buffers[MemberNum];
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ErrorOr<std::unique_ptr<object::SymbolicFile>> ObjOrErr =
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object::SymbolicFile::createSymbolicFile(
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MemberBuffer, sys::fs::file_magic::unknown, &Context);
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if (!ObjOrErr)
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continue; // FIXME: check only for "not an object file" errors.
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object::SymbolicFile &Obj = *ObjOrErr.get();
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if (!HeaderStartOffset) {
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HeaderStartOffset = Out.tell();
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if (Kind == object::Archive::K_GNU)
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printGNUSmallMemberHeader(Out, "", now(Deterministic), 0, 0, 0, 0);
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else
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printBSDMemberHeader(Out, "__.SYMDEF", now(Deterministic), 0, 0, 0, 0);
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BodyStartOffset = Out.tell();
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print32(Out, Kind, 0); // number of entries or bytes
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}
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for (const object::BasicSymbolRef &S : Obj.symbols()) {
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uint32_t Symflags = S.getFlags();
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if (Symflags & object::SymbolRef::SF_FormatSpecific)
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continue;
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if (!(Symflags & object::SymbolRef::SF_Global))
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continue;
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if (Symflags & object::SymbolRef::SF_Undefined)
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continue;
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unsigned NameOffset = NameOS.tell();
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if (auto EC = S.printName(NameOS))
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return EC;
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NameOS << '\0';
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MemberOffsetRefs.push_back(MemberNum);
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if (Kind == object::Archive::K_BSD)
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print32(Out, Kind, NameOffset);
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print32(Out, Kind, 0); // member offset
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}
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}
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if (HeaderStartOffset == 0)
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return 0;
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StringRef StringTable = NameOS.str();
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if (Kind == object::Archive::K_BSD)
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print32(Out, Kind, StringTable.size()); // byte count of the string table
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Out << StringTable;
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// ld64 requires the next member header to start at an offset that is
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// 4 bytes aligned.
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unsigned Pad = OffsetToAlignment(Out.tell(), 4);
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while (Pad--)
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Out.write(uint8_t(0));
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// Patch up the size of the symbol table now that we know how big it is.
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unsigned Pos = Out.tell();
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const unsigned MemberHeaderSize = 60;
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Out.seek(HeaderStartOffset + 48); // offset of the size field.
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printWithSpacePadding(Out, Pos - MemberHeaderSize - HeaderStartOffset, 10);
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// Patch up the number of symbols.
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Out.seek(BodyStartOffset);
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unsigned NumSyms = MemberOffsetRefs.size();
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if (Kind == object::Archive::K_GNU)
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print32(Out, Kind, NumSyms);
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else
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print32(Out, Kind, NumSyms * 8);
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Out.seek(Pos);
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return BodyStartOffset + 4;
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}
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std::pair<StringRef, std::error_code>
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llvm::writeArchive(StringRef ArcName,
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std::vector<NewArchiveIterator> &NewMembers,
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bool WriteSymtab, object::Archive::Kind Kind,
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bool Deterministic, bool Thin) {
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SmallString<128> TmpArchive;
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int TmpArchiveFD;
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if (auto EC = sys::fs::createUniqueFile(ArcName + ".temp-archive-%%%%%%%.a",
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TmpArchiveFD, TmpArchive))
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return std::make_pair(ArcName, EC);
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tool_output_file Output(TmpArchive, TmpArchiveFD);
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raw_fd_ostream &Out = Output.os();
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if (Thin)
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Out << "!<thin>\n";
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else
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Out << "!<arch>\n";
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std::vector<unsigned> MemberOffsetRefs;
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std::vector<std::unique_ptr<MemoryBuffer>> Buffers;
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std::vector<MemoryBufferRef> Members;
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std::vector<sys::fs::file_status> NewMemberStatus;
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for (unsigned I = 0, N = NewMembers.size(); I < N; ++I) {
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NewArchiveIterator &Member = NewMembers[I];
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MemoryBufferRef MemberRef;
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if (Member.isNewMember()) {
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StringRef Filename = Member.getNew();
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NewMemberStatus.resize(NewMemberStatus.size() + 1);
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sys::fs::file_status &Status = NewMemberStatus.back();
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ErrorOr<int> FD = Member.getFD(Status);
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if (auto EC = FD.getError())
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return std::make_pair(Filename, EC);
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ErrorOr<std::unique_ptr<MemoryBuffer>> MemberBufferOrErr =
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MemoryBuffer::getOpenFile(FD.get(), Filename, Status.getSize(),
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false);
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if (auto EC = MemberBufferOrErr.getError())
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return std::make_pair(Filename, EC);
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if (close(FD.get()) != 0)
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return std::make_pair(Filename,
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std::error_code(errno, std::generic_category()));
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Buffers.push_back(std::move(MemberBufferOrErr.get()));
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MemberRef = Buffers.back()->getMemBufferRef();
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} else {
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object::Archive::child_iterator OldMember = Member.getOld();
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assert(!Thin ||
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OldMember->getParent()->isThin() &&
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"Thin archives cannot refers to member of other archives");
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ErrorOr<MemoryBufferRef> MemberBufferOrErr =
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OldMember->getMemoryBufferRef();
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if (auto EC = MemberBufferOrErr.getError())
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return std::make_pair("", EC);
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MemberRef = MemberBufferOrErr.get();
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}
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Members.push_back(MemberRef);
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}
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unsigned MemberReferenceOffset = 0;
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if (WriteSymtab) {
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ErrorOr<unsigned> MemberReferenceOffsetOrErr = writeSymbolTable(
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Out, Kind, NewMembers, Members, MemberOffsetRefs, Deterministic);
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if (auto EC = MemberReferenceOffsetOrErr.getError())
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return std::make_pair(ArcName, EC);
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MemberReferenceOffset = MemberReferenceOffsetOrErr.get();
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}
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std::vector<unsigned> StringMapIndexes;
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if (Kind != object::Archive::K_BSD)
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writeStringTable(Out, NewMembers, StringMapIndexes, Thin);
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unsigned MemberNum = 0;
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unsigned NewMemberNum = 0;
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std::vector<unsigned>::iterator StringMapIndexIter = StringMapIndexes.begin();
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std::vector<unsigned> MemberOffset;
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for (const NewArchiveIterator &I : NewMembers) {
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MemoryBufferRef File = Members[MemberNum++];
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unsigned Pos = Out.tell();
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MemberOffset.push_back(Pos);
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sys::TimeValue ModTime;
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unsigned UID;
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unsigned GID;
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unsigned Perms;
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if (Deterministic) {
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ModTime.fromEpochTime(0);
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UID = 0;
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GID = 0;
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Perms = 0644;
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} else if (I.isNewMember()) {
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const sys::fs::file_status &Status = NewMemberStatus[NewMemberNum];
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ModTime = Status.getLastModificationTime();
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UID = Status.getUser();
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GID = Status.getGroup();
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Perms = Status.permissions();
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} else {
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object::Archive::child_iterator OldMember = I.getOld();
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ModTime = OldMember->getLastModified();
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UID = OldMember->getUID();
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GID = OldMember->getGID();
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Perms = OldMember->getAccessMode();
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}
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if (I.isNewMember()) {
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StringRef FileName = I.getNew();
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const sys::fs::file_status &Status = NewMemberStatus[NewMemberNum++];
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printMemberHeader(Out, Kind, Thin, sys::path::filename(FileName),
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StringMapIndexIter, ModTime, UID, GID, Perms,
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Status.getSize());
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} else {
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object::Archive::child_iterator OldMember = I.getOld();
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printMemberHeader(Out, Kind, Thin, I.getName(), StringMapIndexIter,
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ModTime, UID, GID, Perms, OldMember->getSize());
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}
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if (!Thin)
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Out << File.getBuffer();
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if (Out.tell() % 2)
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Out << '\n';
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}
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if (MemberReferenceOffset) {
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Out.seek(MemberReferenceOffset);
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for (unsigned MemberNum : MemberOffsetRefs) {
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if (Kind == object::Archive::K_BSD)
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Out.seek(Out.tell() + 4); // skip over the string offset
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print32(Out, Kind, MemberOffset[MemberNum]);
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}
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}
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Output.keep();
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Out.close();
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sys::fs::rename(TmpArchive, ArcName);
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return std::make_pair("", std::error_code());
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}
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