vendor/llvm/llvm-trunk-r239412

1 files changed, 342 insertions, 0 deletions

diff --git a/lib/Object/ArchiveWriter.cpp b/lib/Object/ArchiveWriter.cpp
new file mode 100644
index 000000000000..90a736f3baf4
--- /dev/null
+++ b/lib/Object/ArchiveWriter.cpp
@@ -0,0 +1,342 @@
+//===- ArchiveWriter.cpp - ar File Format implementation --------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines the writeArchive function.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Object/ArchiveWriter.h"
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/IR/LLVMContext.h"
+#include "llvm/Object/Archive.h"
+#include "llvm/Object/ObjectFile.h"
+#include "llvm/Object/SymbolicFile.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/Format.h"
+#include "llvm/Support/Path.h"
+#include "llvm/Support/ToolOutputFile.h"
+#include "llvm/Support/raw_ostream.h"
+
+#if !defined(_MSC_VER) && !defined(__MINGW32__)
+#include <unistd.h>
+#else
+#include <io.h>
+#endif
+
+using namespace llvm;
+
+NewArchiveIterator::NewArchiveIterator() {}
+
+NewArchiveIterator::NewArchiveIterator(object::Archive::child_iterator I,
+                                       StringRef Name)
+    : IsNewMember(false), Name(Name), OldI(I) {}
+
+NewArchiveIterator::NewArchiveIterator(StringRef NewFilename, StringRef Name)
+    : IsNewMember(true), Name(Name), NewFilename(NewFilename) {}
+
+StringRef NewArchiveIterator::getName() const { return Name; }
+
+bool NewArchiveIterator::isNewMember() const { return IsNewMember; }
+
+object::Archive::child_iterator NewArchiveIterator::getOld() const {
+  assert(!IsNewMember);
+  return OldI;
+}
+
+StringRef NewArchiveIterator::getNew() const {
+  assert(IsNewMember);
+  return NewFilename;
+}
+
+llvm::ErrorOr<int>
+NewArchiveIterator::getFD(sys::fs::file_status &NewStatus) const {
+  assert(IsNewMember);
+  int NewFD;
+  if (auto EC = sys::fs::openFileForRead(NewFilename, NewFD))
+    return EC;
+  assert(NewFD != -1);
+
+  if (auto EC = sys::fs::status(NewFD, NewStatus))
+    return EC;
+
+  // Opening a directory doesn't make sense. Let it fail.
+  // Linux cannot open directories with open(2), although
+  // cygwin and *bsd can.
+  if (NewStatus.type() == sys::fs::file_type::directory_file)
+    return make_error_code(std::errc::is_a_directory);
+
+  return NewFD;
+}
+
+template <typename T>
+static void printWithSpacePadding(raw_fd_ostream &OS, T Data, unsigned Size,
+				  bool MayTruncate = false) {
+  uint64_t OldPos = OS.tell();
+  OS << Data;
+  unsigned SizeSoFar = OS.tell() - OldPos;
+  if (Size > SizeSoFar) {
+    unsigned Remaining = Size - SizeSoFar;
+    for (unsigned I = 0; I < Remaining; ++I)
+      OS << ' ';
+  } else if (Size < SizeSoFar) {
+    assert(MayTruncate && "Data doesn't fit in Size");
+    // Some of the data this is used for (like UID) can be larger than the
+    // space available in the archive format. Truncate in that case.
+    OS.seek(OldPos + Size);
+  }
+}
+
+static void print32BE(raw_fd_ostream &Out, unsigned Val) {
+  // FIXME: Should use Endian.h here.
+  for (int I = 3; I >= 0; --I) {
+    char V = (Val >> (8 * I)) & 0xff;
+    Out << V;
+  }
+}
+
+static void printRestOfMemberHeader(raw_fd_ostream &Out,
+                                    const sys::TimeValue &ModTime, unsigned UID,
+                                    unsigned GID, unsigned Perms,
+                                    unsigned Size) {
+  printWithSpacePadding(Out, ModTime.toEpochTime(), 12);
+  printWithSpacePadding(Out, UID, 6, true);
+  printWithSpacePadding(Out, GID, 6, true);
+  printWithSpacePadding(Out, format("%o", Perms), 8);
+  printWithSpacePadding(Out, Size, 10);
+  Out << "`\n";
+}
+
+static void printMemberHeader(raw_fd_ostream &Out, StringRef Name,
+                              const sys::TimeValue &ModTime, unsigned UID,
+                              unsigned GID, unsigned Perms, unsigned Size) {
+  printWithSpacePadding(Out, Twine(Name) + "/", 16);
+  printRestOfMemberHeader(Out, ModTime, UID, GID, Perms, Size);
+}
+
+static void printMemberHeader(raw_fd_ostream &Out, unsigned NameOffset,
+                              const sys::TimeValue &ModTime, unsigned UID,
+                              unsigned GID, unsigned Perms, unsigned Size) {
+  Out << '/';
+  printWithSpacePadding(Out, NameOffset, 15);
+  printRestOfMemberHeader(Out, ModTime, UID, GID, Perms, Size);
+}
+
+static void writeStringTable(raw_fd_ostream &Out,
+                             ArrayRef<NewArchiveIterator> Members,
+                             std::vector<unsigned> &StringMapIndexes) {
+  unsigned StartOffset = 0;
+  for (ArrayRef<NewArchiveIterator>::iterator I = Members.begin(),
+                                              E = Members.end();
+       I != E; ++I) {
+    StringRef Name = I->getName();
+    if (Name.size() < 16)
+      continue;
+    if (StartOffset == 0) {
+      printWithSpacePadding(Out, "//", 58);
+      Out << "`\n";
+      StartOffset = Out.tell();
+    }
+    StringMapIndexes.push_back(Out.tell() - StartOffset);
+    Out << Name << "/\n";
+  }
+  if (StartOffset == 0)
+    return;
+  if (Out.tell() % 2)
+    Out << '\n';
+  int Pos = Out.tell();
+  Out.seek(StartOffset - 12);
+  printWithSpacePadding(Out, Pos - StartOffset, 10);
+  Out.seek(Pos);
+}
+
+// Returns the offset of the first reference to a member offset.
+static ErrorOr<unsigned>
+writeSymbolTable(raw_fd_ostream &Out, ArrayRef<NewArchiveIterator> Members,
+                 ArrayRef<MemoryBufferRef> Buffers,
+                 std::vector<unsigned> &MemberOffsetRefs) {
+  unsigned StartOffset = 0;
+  unsigned MemberNum = 0;
+  std::string NameBuf;
+  raw_string_ostream NameOS(NameBuf);
+  unsigned NumSyms = 0;
+  LLVMContext Context;
+  for (ArrayRef<NewArchiveIterator>::iterator I = Members.begin(),
+                                              E = Members.end();
+       I != E; ++I, ++MemberNum) {
+    MemoryBufferRef MemberBuffer = Buffers[MemberNum];
+    ErrorOr<std::unique_ptr<object::SymbolicFile>> ObjOrErr =
+        object::SymbolicFile::createSymbolicFile(
+            MemberBuffer, sys::fs::file_magic::unknown, &Context);
+    if (!ObjOrErr)
+      continue;  // FIXME: check only for "not an object file" errors.
+    object::SymbolicFile &Obj = *ObjOrErr.get();
+
+    if (!StartOffset) {
+      printMemberHeader(Out, "", sys::TimeValue::now(), 0, 0, 0, 0);
+      StartOffset = Out.tell();
+      print32BE(Out, 0);
+    }
+
+    for (const object::BasicSymbolRef &S : Obj.symbols()) {
+      uint32_t Symflags = S.getFlags();
+      if (Symflags & object::SymbolRef::SF_FormatSpecific)
+        continue;
+      if (!(Symflags & object::SymbolRef::SF_Global))
+        continue;
+      if (Symflags & object::SymbolRef::SF_Undefined)
+        continue;
+      if (auto EC = S.printName(NameOS))
+        return EC;
+      NameOS << '\0';
+      ++NumSyms;
+      MemberOffsetRefs.push_back(MemberNum);
+      print32BE(Out, 0);
+    }
+  }
+  Out << NameOS.str();
+
+  if (StartOffset == 0)
+    return 0;
+
+  if (Out.tell() % 2)
+    Out << '\0';
+
+  unsigned Pos = Out.tell();
+  Out.seek(StartOffset - 12);
+  printWithSpacePadding(Out, Pos - StartOffset, 10);
+  Out.seek(StartOffset);
+  print32BE(Out, NumSyms);
+  Out.seek(Pos);
+  return StartOffset + 4;
+}
+
+std::pair<StringRef, std::error_code>
+llvm::writeArchive(StringRef ArcName,
+                   std::vector<NewArchiveIterator> &NewMembers,
+                   bool WriteSymtab) {
+  SmallString<128> TmpArchive;
+  int TmpArchiveFD;
+  if (auto EC = sys::fs::createUniqueFile(ArcName + ".temp-archive-%%%%%%%.a",
+                                          TmpArchiveFD, TmpArchive))
+    return std::make_pair(ArcName, EC);
+
+  tool_output_file Output(TmpArchive, TmpArchiveFD);
+  raw_fd_ostream &Out = Output.os();
+  Out << "!<arch>\n";
+
+  std::vector<unsigned> MemberOffsetRefs;
+
+  std::vector<std::unique_ptr<MemoryBuffer>> Buffers;
+  std::vector<MemoryBufferRef> Members;
+  std::vector<sys::fs::file_status> NewMemberStatus;
+
+  for (unsigned I = 0, N = NewMembers.size(); I < N; ++I) {
+    NewArchiveIterator &Member = NewMembers[I];
+    MemoryBufferRef MemberRef;
+
+    if (Member.isNewMember()) {
+      StringRef Filename = Member.getNew();
+      NewMemberStatus.resize(NewMemberStatus.size() + 1);
+      sys::fs::file_status &Status = NewMemberStatus.back();
+      ErrorOr<int> FD = Member.getFD(Status);
+      if (auto EC = FD.getError())
+        return std::make_pair(Filename, EC);
+      ErrorOr<std::unique_ptr<MemoryBuffer>> MemberBufferOrErr =
+          MemoryBuffer::getOpenFile(FD.get(), Filename, Status.getSize(),
+                                    false);
+      if (auto EC = MemberBufferOrErr.getError())
+        return std::make_pair(Filename, EC);
+      if (close(FD.get()) != 0)
+        return std::make_pair(Filename,
+                              std::error_code(errno, std::generic_category()));
+      Buffers.push_back(std::move(MemberBufferOrErr.get()));
+      MemberRef = Buffers.back()->getMemBufferRef();
+    } else {
+      object::Archive::child_iterator OldMember = Member.getOld();
+      ErrorOr<MemoryBufferRef> MemberBufferOrErr =
+          OldMember->getMemoryBufferRef();
+      if (auto EC = MemberBufferOrErr.getError())
+        return std::make_pair("", EC);
+      MemberRef = MemberBufferOrErr.get();
+    }
+    Members.push_back(MemberRef);
+  }
+
+  unsigned MemberReferenceOffset = 0;
+  if (WriteSymtab) {
+    ErrorOr<unsigned> MemberReferenceOffsetOrErr =
+        writeSymbolTable(Out, NewMembers, Members, MemberOffsetRefs);
+    if (auto EC = MemberReferenceOffsetOrErr.getError())
+      return std::make_pair(ArcName, EC);
+    MemberReferenceOffset = MemberReferenceOffsetOrErr.get();
+  }
+
+  std::vector<unsigned> StringMapIndexes;
+  writeStringTable(Out, NewMembers, StringMapIndexes);
+
+  unsigned MemberNum = 0;
+  unsigned LongNameMemberNum = 0;
+  unsigned NewMemberNum = 0;
+  std::vector<unsigned> MemberOffset;
+  for (std::vector<NewArchiveIterator>::iterator I = NewMembers.begin(),
+                                                 E = NewMembers.end();
+       I != E; ++I, ++MemberNum) {
+
+    unsigned Pos = Out.tell();
+    MemberOffset.push_back(Pos);
+
+    MemoryBufferRef File = Members[MemberNum];
+    if (I->isNewMember()) {
+      StringRef FileName = I->getNew();
+      const sys::fs::file_status &Status = NewMemberStatus[NewMemberNum];
+      NewMemberNum++;
+
+      StringRef Name = sys::path::filename(FileName);
+      if (Name.size() < 16)
+        printMemberHeader(Out, Name, Status.getLastModificationTime(),
+                          Status.getUser(), Status.getGroup(),
+                          Status.permissions(), Status.getSize());
+      else
+        printMemberHeader(Out, StringMapIndexes[LongNameMemberNum++],
+                          Status.getLastModificationTime(), Status.getUser(),
+                          Status.getGroup(), Status.permissions(),
+                          Status.getSize());
+    } else {
+      object::Archive::child_iterator OldMember = I->getOld();
+      StringRef Name = I->getName();
+
+      if (Name.size() < 16)
+        printMemberHeader(Out, Name, OldMember->getLastModified(),
+                          OldMember->getUID(), OldMember->getGID(),
+                          OldMember->getAccessMode(), OldMember->getSize());
+      else
+        printMemberHeader(Out, StringMapIndexes[LongNameMemberNum++],
+                          OldMember->getLastModified(), OldMember->getUID(),
+                          OldMember->getGID(), OldMember->getAccessMode(),
+                          OldMember->getSize());
+    }
+
+    Out << File.getBuffer();
+
+    if (Out.tell() % 2)
+      Out << '\n';
+  }
+
+  if (MemberReferenceOffset) {
+    Out.seek(MemberReferenceOffset);
+    for (unsigned MemberNum : MemberOffsetRefs)
+      print32BE(Out, MemberOffset[MemberNum]);
+  }
+
+  Output.keep();
+  Out.close();
+  sys::fs::rename(TmpArchive, ArcName);
+  return std::make_pair("", std::error_code());
+}