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llvm-mirror/tools/llvm-ar/llvm-ar.cpp
Rafael Espindola b1d09a178a llvm-ar: Start adding support for mri scripts. 
I was quiet surprised to find this feature being used. Fortunately the uses
I found look fairly simple. In fact, they are just a very verbose version
of the regular ar commands.

Start implementing it then by parsing the script and setting the command
variables as if we had a regular command line.

This patch adds just enough support to create an empty archive and do a bit
of error checking. In followup patches I will implement at least addmod
and addlib.

From the description in the manual, even the more general case should not
be too hard to implement if needed. The features that don't map 1:1 to
the simple command line are

* Reading from multiple archives.
* Creating multiple archives.

llvm-svn: 219521
2014-10-10 18:33:51 +00:00

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//===-- llvm-ar.cpp - LLVM archive librarian utility ----------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Builds up (relatively) standard unix archive files (.a) containing LLVM
// bitcode or other files.
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/StringSwitch.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "llvm/Object/Archive.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Errc.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/LineIterator.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/PrettyStackTrace.h"
#include "llvm/Support/Signals.h"
#include "llvm/Support/TargetSelect.h"
#include "llvm/Support/ToolOutputFile.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <cstdlib>
#include <memory>
#if !defined(_MSC_VER) && !defined(__MINGW32__)
#include <unistd.h>
#else
#include <io.h>
#endif
using namespace llvm;
// The name this program was invoked as.
static StringRef ToolName;
static const char *TemporaryOutput;
static int TmpArchiveFD = -1;
// fail - Show the error message and exit.
LLVM_ATTRIBUTE_NORETURN static void fail(Twine Error) {
outs() << ToolName << ": " << Error << ".\n";
if (TmpArchiveFD != -1)
close(TmpArchiveFD);
if (TemporaryOutput)
sys::fs::remove(TemporaryOutput);
exit(1);
}
static void failIfError(std::error_code EC, Twine Context = "") {
if (!EC)
return;
std::string ContextStr = Context.str();
if (ContextStr == "")
fail(EC.message());
fail(Context + ": " + EC.message());
}
// llvm-ar/llvm-ranlib remaining positional arguments.
static cl::list<std::string>
RestOfArgs(cl::Positional, cl::ZeroOrMore,
cl::desc("[relpos] [count] <archive-file> [members]..."));
static cl::opt<bool> MRI("M", cl::desc(""));
std::string Options;
// MoreHelp - Provide additional help output explaining the operations and
// modifiers of llvm-ar. This object instructs the CommandLine library
// to print the text of the constructor when the --help option is given.
static cl::extrahelp MoreHelp(
"\nOPERATIONS:\n"
" d[NsS] - delete file(s) from the archive\n"
" m[abiSs] - move file(s) in the archive\n"
" p[kN] - print file(s) found in the archive\n"
" q[ufsS] - quick append file(s) to the archive\n"
" r[abfiuRsS] - replace or insert file(s) into the archive\n"
" t - display contents of archive\n"
" x[No] - extract file(s) from the archive\n"
"\nMODIFIERS (operation specific):\n"
" [a] - put file(s) after [relpos]\n"
" [b] - put file(s) before [relpos] (same as [i])\n"
" [i] - put file(s) before [relpos] (same as [b])\n"
" [N] - use instance [count] of name\n"
" [o] - preserve original dates\n"
" [s] - create an archive index (cf. ranlib)\n"
" [S] - do not build a symbol table\n"
" [u] - update only files newer than archive contents\n"
"\nMODIFIERS (generic):\n"
" [c] - do not warn if the library had to be created\n"
" [v] - be verbose about actions taken\n"
);
// This enumeration delineates the kinds of operations on an archive
// that are permitted.
enum ArchiveOperation {
Print, ///< Print the contents of the archive
Delete, ///< Delete the specified members
Move, ///< Move members to end or as given by {a,b,i} modifiers
QuickAppend, ///< Quickly append to end of archive
ReplaceOrInsert, ///< Replace or Insert members
DisplayTable, ///< Display the table of contents
Extract, ///< Extract files back to file system
CreateSymTab ///< Create a symbol table in an existing archive
};
// Modifiers to follow operation to vary behavior
static bool AddAfter = false; ///< 'a' modifier
static bool AddBefore = false; ///< 'b' modifier
static bool Create = false; ///< 'c' modifier
static bool OriginalDates = false; ///< 'o' modifier
static bool OnlyUpdate = false; ///< 'u' modifier
static bool Verbose = false; ///< 'v' modifier
static bool Symtab = true; ///< 's' modifier
// Relative Positional Argument (for insert/move). This variable holds
// the name of the archive member to which the 'a', 'b' or 'i' modifier
// refers. Only one of 'a', 'b' or 'i' can be specified so we only need
// one variable.
static std::string RelPos;
// This variable holds the name of the archive file as given on the
// command line.
static std::string ArchiveName;
// This variable holds the list of member files to proecess, as given
// on the command line.
static std::vector<std::string> Members;
// show_help - Show the error message, the help message and exit.
LLVM_ATTRIBUTE_NORETURN static void
show_help(const std::string &msg) {
errs() << ToolName << ": " << msg << "\n\n";
cl::PrintHelpMessage();
std::exit(1);
}
// getRelPos - Extract the member filename from the command line for
// the [relpos] argument associated with a, b, and i modifiers
static void getRelPos() {
if(RestOfArgs.size() == 0)
show_help("Expected [relpos] for a, b, or i modifier");
RelPos = RestOfArgs[0];
RestOfArgs.erase(RestOfArgs.begin());
}
static void getOptions() {
if(RestOfArgs.size() == 0)
show_help("Expected options");
Options = RestOfArgs[0];
RestOfArgs.erase(RestOfArgs.begin());
}
// getArchive - Get the archive file name from the command line
static void getArchive() {
if(RestOfArgs.size() == 0)
show_help("An archive name must be specified");
ArchiveName = RestOfArgs[0];
RestOfArgs.erase(RestOfArgs.begin());
}
// getMembers - Copy over remaining items in RestOfArgs to our Members vector
// This is just for clarity.
static void getMembers() {
if(RestOfArgs.size() > 0)
Members = std::vector<std::string>(RestOfArgs);
}
namespace {
enum class MRICommand { Create, Save, End, Invalid };
}
static ArchiveOperation parseMRIScript() {
ErrorOr<std::unique_ptr<MemoryBuffer>> Buf = MemoryBuffer::getSTDIN();
failIfError(Buf.getError());
const MemoryBuffer &Ref = *Buf.get();
bool Saved = false;
for (line_iterator I(Ref, /*SkipBlanks*/ true, ';'), E; I != E; ++I) {
StringRef Line = *I;
StringRef CommandStr, Rest;
std::tie(CommandStr, Rest) = Line.split(' ');
auto Command = StringSwitch<MRICommand>(CommandStr.lower())
.Case("create", MRICommand::Create)
.Case("save", MRICommand::Save)
.Case("end", MRICommand::End)
.Default(MRICommand::Invalid);
switch (Command) {
case MRICommand::Create:
Create = true;
if (!ArchiveName.empty())
fail("Editing multiple archives not supported");
if (Saved)
fail("File already saved");
ArchiveName = Rest;
break;
case MRICommand::Save:
Saved = true;
break;
case MRICommand::End:
break;
case MRICommand::Invalid:
fail("Unknown command: " + CommandStr);
}
}
// Nothing to do if not saved.
if (!Saved)
exit(0);
return ReplaceOrInsert;
}
// parseCommandLine - Parse the command line options as presented and return the
// operation specified. Process all modifiers and check to make sure that
// constraints on modifier/operation pairs have not been violated.
static ArchiveOperation parseCommandLine() {
if (MRI) {
if (!RestOfArgs.empty())
fail("Cannot mix -M and other options");
return parseMRIScript();
}
getOptions();
// Keep track of number of operations. We can only specify one
// per execution.
unsigned NumOperations = 0;
// Keep track of the number of positional modifiers (a,b,i). Only
// one can be specified.
unsigned NumPositional = 0;
// Keep track of which operation was requested
ArchiveOperation Operation;
bool MaybeJustCreateSymTab = false;
for(unsigned i=0; i<Options.size(); ++i) {
switch(Options[i]) {
case 'd': ++NumOperations; Operation = Delete; break;
case 'm': ++NumOperations; Operation = Move ; break;
case 'p': ++NumOperations; Operation = Print; break;
case 'q': ++NumOperations; Operation = QuickAppend; break;
case 'r': ++NumOperations; Operation = ReplaceOrInsert; break;
case 't': ++NumOperations; Operation = DisplayTable; break;
case 'x': ++NumOperations; Operation = Extract; break;
case 'c': Create = true; break;
case 'l': /* accepted but unused */ break;
case 'o': OriginalDates = true; break;
case 's':
Symtab = true;
MaybeJustCreateSymTab = true;
break;
case 'S':
Symtab = false;
break;
case 'u': OnlyUpdate = true; break;
case 'v': Verbose = true; break;
case 'a':
getRelPos();
AddAfter = true;
NumPositional++;
break;
case 'b':
getRelPos();
AddBefore = true;
NumPositional++;
break;
case 'i':
getRelPos();
AddBefore = true;
NumPositional++;
break;
default:
cl::PrintHelpMessage();
}
}
// At this point, the next thing on the command line must be
// the archive name.
getArchive();
// Everything on the command line at this point is a member.
getMembers();
if (NumOperations == 0 && MaybeJustCreateSymTab) {
NumOperations = 1;
Operation = CreateSymTab;
if (!Members.empty())
show_help("The s operation takes only an archive as argument");
}
// Perform various checks on the operation/modifier specification
// to make sure we are dealing with a legal request.
if (NumOperations == 0)
show_help("You must specify at least one of the operations");
if (NumOperations > 1)
show_help("Only one operation may be specified");
if (NumPositional > 1)
show_help("You may only specify one of a, b, and i modifiers");
if (AddAfter || AddBefore) {
if (Operation != Move && Operation != ReplaceOrInsert)
show_help("The 'a', 'b' and 'i' modifiers can only be specified with "
"the 'm' or 'r' operations");
}
if (OriginalDates && Operation != Extract)
show_help("The 'o' modifier is only applicable to the 'x' operation");
if (OnlyUpdate && Operation != ReplaceOrInsert)
show_help("The 'u' modifier is only applicable to the 'r' operation");
// Return the parsed operation to the caller
return Operation;
}
// Implements the 'p' operation. This function traverses the archive
// looking for members that match the path list.
static void doPrint(StringRef Name, object::Archive::child_iterator I) {
if (Verbose)
outs() << "Printing " << Name << "\n";
StringRef Data = I->getBuffer();
outs().write(Data.data(), Data.size());
}
// putMode - utility function for printing out the file mode when the 't'
// operation is in verbose mode.
static void printMode(unsigned mode) {
if (mode & 004)
outs() << "r";
else
outs() << "-";
if (mode & 002)
outs() << "w";
else
outs() << "-";
if (mode & 001)
outs() << "x";
else
outs() << "-";
}
// Implement the 't' operation. This function prints out just
// the file names of each of the members. However, if verbose mode is requested
// ('v' modifier) then the file type, permission mode, user, group, size, and
// modification time are also printed.
static void doDisplayTable(StringRef Name, object::Archive::child_iterator I) {
if (Verbose) {
sys::fs::perms Mode = I->getAccessMode();
printMode((Mode >> 6) & 007);
printMode((Mode >> 3) & 007);
printMode(Mode & 007);
outs() << ' ' << I->getUID();
outs() << '/' << I->getGID();
outs() << ' ' << format("%6llu", I->getSize());
outs() << ' ' << I->getLastModified().str();
outs() << ' ';
}
outs() << Name << "\n";
}
// Implement the 'x' operation. This function extracts files back to the file
// system.
static void doExtract(StringRef Name, object::Archive::child_iterator I) {
// Retain the original mode.
sys::fs::perms Mode = I->getAccessMode();
SmallString<128> Storage = Name;
int FD;
failIfError(
sys::fs::openFileForWrite(Storage.c_str(), FD, sys::fs::F_None, Mode),
Storage.c_str());
{
raw_fd_ostream file(FD, false);
// Get the data and its length
StringRef Data = I->getBuffer();
// Write the data.
file.write(Data.data(), Data.size());
}
// If we're supposed to retain the original modification times, etc. do so
// now.
if (OriginalDates)
failIfError(
sys::fs::setLastModificationAndAccessTime(FD, I->getLastModified()));
if (close(FD))
fail("Could not close the file");
}
static bool shouldCreateArchive(ArchiveOperation Op) {
switch (Op) {
case Print:
case Delete:
case Move:
case DisplayTable:
case Extract:
case CreateSymTab:
return false;
case QuickAppend:
case ReplaceOrInsert:
return true;
}
llvm_unreachable("Missing entry in covered switch.");
}
static void performReadOperation(ArchiveOperation Operation,
object::Archive *OldArchive) {
for (object::Archive::child_iterator I = OldArchive->child_begin(),
E = OldArchive->child_end();
I != E; ++I) {
ErrorOr<StringRef> NameOrErr = I->getName();
failIfError(NameOrErr.getError());
StringRef Name = NameOrErr.get();
if (!Members.empty() &&
std::find(Members.begin(), Members.end(), Name) == Members.end())
continue;
switch (Operation) {
default:
llvm_unreachable("Not a read operation");
case Print:
doPrint(Name, I);
break;
case DisplayTable:
doDisplayTable(Name, I);
break;
case Extract:
doExtract(Name, I);
break;
}
}
}
namespace {
class NewArchiveIterator {
bool IsNewMember;
StringRef Name;
object::Archive::child_iterator OldI;
std::string NewFilename;
mutable int NewFD;
mutable sys::fs::file_status NewStatus;
public:
NewArchiveIterator(object::Archive::child_iterator I, StringRef Name);
NewArchiveIterator(std::string *I, StringRef Name);
NewArchiveIterator();
bool isNewMember() const;
StringRef getName() const;
object::Archive::child_iterator getOld() const;
const char *getNew() const;
int getFD() const;
const sys::fs::file_status &getStatus() const;
};
}
NewArchiveIterator::NewArchiveIterator() {}
NewArchiveIterator::NewArchiveIterator(object::Archive::child_iterator I,
StringRef Name)
: IsNewMember(false), Name(Name), OldI(I) {}
NewArchiveIterator::NewArchiveIterator(std::string *NewFilename, StringRef Name)
: IsNewMember(true), Name(Name), NewFilename(*NewFilename), NewFD(-1) {}
StringRef NewArchiveIterator::getName() const { return Name; }
bool NewArchiveIterator::isNewMember() const { return IsNewMember; }
object::Archive::child_iterator NewArchiveIterator::getOld() const {
assert(!IsNewMember);
return OldI;
}
const char *NewArchiveIterator::getNew() const {
assert(IsNewMember);
return NewFilename.c_str();
}
int NewArchiveIterator::getFD() const {
assert(IsNewMember);
if (NewFD != -1)
return NewFD;
failIfError(sys::fs::openFileForRead(NewFilename, NewFD), NewFilename);
assert(NewFD != -1);
failIfError(sys::fs::status(NewFD, NewStatus), NewFilename);
// 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)
failIfError(make_error_code(errc::is_a_directory), NewFilename);
return NewFD;
}
const sys::fs::file_status &NewArchiveIterator::getStatus() const {
assert(IsNewMember);
assert(NewFD != -1 && "Must call getFD first");
return NewStatus;
}
template <typename T>
void addMember(std::vector<NewArchiveIterator> &Members, T I, StringRef Name,
int Pos = -1) {
NewArchiveIterator NI(I, Name);
if (Pos == -1)
Members.push_back(NI);
else
Members[Pos] = NI;
}
enum InsertAction {
IA_AddOldMember,
IA_AddNewMeber,
IA_Delete,
IA_MoveOldMember,
IA_MoveNewMember
};
static InsertAction
computeInsertAction(ArchiveOperation Operation,
object::Archive::child_iterator I, StringRef Name,
std::vector<std::string>::iterator &Pos) {
if (Operation == QuickAppend || Members.empty())
return IA_AddOldMember;
std::vector<std::string>::iterator MI = std::find_if(
Members.begin(), Members.end(),
[Name](StringRef Path) { return Name == sys::path::filename(Path); });
if (MI == Members.end())
return IA_AddOldMember;
Pos = MI;
if (Operation == Delete)
return IA_Delete;
if (Operation == Move)
return IA_MoveOldMember;
if (Operation == ReplaceOrInsert) {
StringRef PosName = sys::path::filename(RelPos);
if (!OnlyUpdate) {
if (PosName.empty())
return IA_AddNewMeber;
return IA_MoveNewMember;
}
// We could try to optimize this to a fstat, but it is not a common
// operation.
sys::fs::file_status Status;
failIfError(sys::fs::status(*MI, Status), *MI);
if (Status.getLastModificationTime() < I->getLastModified()) {
if (PosName.empty())
return IA_AddOldMember;
return IA_MoveOldMember;
}
if (PosName.empty())
return IA_AddNewMeber;
return IA_MoveNewMember;
}
llvm_unreachable("No such operation");
}
// We have to walk this twice and computing it is not trivial, so creating an
// explicit std::vector is actually fairly efficient.
static std::vector<NewArchiveIterator>
computeNewArchiveMembers(ArchiveOperation Operation,
object::Archive *OldArchive) {
std::vector<NewArchiveIterator> Ret;
std::vector<NewArchiveIterator> Moved;
int InsertPos = -1;
StringRef PosName = sys::path::filename(RelPos);
if (OldArchive) {
for (object::Archive::child_iterator I = OldArchive->child_begin(),
E = OldArchive->child_end();
I != E; ++I) {
int Pos = Ret.size();
ErrorOr<StringRef> NameOrErr = I->getName();
failIfError(NameOrErr.getError());
StringRef Name = NameOrErr.get();
if (Name == PosName) {
assert(AddAfter || AddBefore);
if (AddBefore)
InsertPos = Pos;
else
InsertPos = Pos + 1;
}
std::vector<std::string>::iterator MemberI = Members.end();
InsertAction Action = computeInsertAction(Operation, I, Name, MemberI);
switch (Action) {
case IA_AddOldMember:
addMember(Ret, I, Name);
break;
case IA_AddNewMeber:
addMember(Ret, &*MemberI, Name);
break;
case IA_Delete:
break;
case IA_MoveOldMember:
addMember(Moved, I, Name);
break;
case IA_MoveNewMember:
addMember(Moved, &*MemberI, Name);
break;
}
if (MemberI != Members.end())
Members.erase(MemberI);
}
}
if (Operation == Delete)
return Ret;
if (!RelPos.empty() && InsertPos == -1)
fail("Insertion point not found");
if (RelPos.empty())
InsertPos = Ret.size();
assert(unsigned(InsertPos) <= Ret.size());
Ret.insert(Ret.begin() + InsertPos, Moved.begin(), Moved.end());
Ret.insert(Ret.begin() + InsertPos, Members.size(), NewArchiveIterator());
int Pos = InsertPos;
for (std::vector<std::string>::iterator I = Members.begin(),
E = Members.end();
I != E; ++I, ++Pos) {
StringRef Name = sys::path::filename(*I);
addMember(Ret, &*I, Name, Pos);
}
return Ret;
}
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) {
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);
}
static void
writeSymbolTable(raw_fd_ostream &Out, ArrayRef<NewArchiveIterator> Members,
ArrayRef<MemoryBufferRef> Buffers,
std::vector<std::pair<unsigned, unsigned>> &MemberOffsetRefs) {
unsigned StartOffset = 0;
unsigned MemberNum = 0;
std::string NameBuf;
raw_string_ostream NameOS(NameBuf);
unsigned NumSyms = 0;
LLVMContext &Context = getGlobalContext();
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;
failIfError(S.printName(NameOS));
NameOS << '\0';
++NumSyms;
MemberOffsetRefs.push_back(std::make_pair(Out.tell(), MemberNum));
print32BE(Out, 0);
}
}
Out << NameOS.str();
if (StartOffset == 0)
return;
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);
}
static void performWriteOperation(ArchiveOperation Operation,
object::Archive *OldArchive) {
SmallString<128> TmpArchive;
failIfError(sys::fs::createUniqueFile(ArchiveName + ".temp-archive-%%%%%%%.a",
TmpArchiveFD, TmpArchive));
TemporaryOutput = TmpArchive.c_str();
tool_output_file Output(TemporaryOutput, TmpArchiveFD);
raw_fd_ostream &Out = Output.os();
Out << "!<arch>\n";
std::vector<NewArchiveIterator> NewMembers =
computeNewArchiveMembers(Operation, OldArchive);
std::vector<std::pair<unsigned, unsigned> > MemberOffsetRefs;
std::vector<std::unique_ptr<MemoryBuffer>> Buffers;
std::vector<MemoryBufferRef> Members;
for (unsigned I = 0, N = NewMembers.size(); I < N; ++I) {
NewArchiveIterator &Member = NewMembers[I];
MemoryBufferRef MemberRef;
if (Member.isNewMember()) {
const char *Filename = Member.getNew();
int FD = Member.getFD();
const sys::fs::file_status &Status = Member.getStatus();
ErrorOr<std::unique_ptr<MemoryBuffer>> MemberBufferOrErr =
MemoryBuffer::getOpenFile(FD, Filename, Status.getSize(), false);
failIfError(MemberBufferOrErr.getError(), Filename);
Buffers.push_back(std::move(MemberBufferOrErr.get()));
MemberRef = Buffers.back()->getMemBufferRef();
} else {
object::Archive::child_iterator OldMember = Member.getOld();
ErrorOr<MemoryBufferRef> MemberBufferOrErr =
OldMember->getMemoryBufferRef();
failIfError(MemberBufferOrErr.getError());
MemberRef = MemberBufferOrErr.get();
}
Members.push_back(MemberRef);
}
if (Symtab) {
writeSymbolTable(Out, NewMembers, Members, MemberOffsetRefs);
}
std::vector<unsigned> StringMapIndexes;
writeStringTable(Out, NewMembers, StringMapIndexes);
std::vector<std::pair<unsigned, unsigned> >::iterator MemberRefsI =
MemberOffsetRefs.begin();
unsigned MemberNum = 0;
unsigned LongNameMemberNum = 0;
for (std::vector<NewArchiveIterator>::iterator I = NewMembers.begin(),
E = NewMembers.end();
I != E; ++I, ++MemberNum) {
unsigned Pos = Out.tell();
while (MemberRefsI != MemberOffsetRefs.end() &&
MemberRefsI->second == MemberNum) {
Out.seek(MemberRefsI->first);
print32BE(Out, Pos);
++MemberRefsI;
}
Out.seek(Pos);
MemoryBufferRef File = Members[MemberNum];
if (I->isNewMember()) {
const char *FileName = I->getNew();
const sys::fs::file_status &Status = I->getStatus();
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';
}
Output.keep();
Out.close();
sys::fs::rename(TemporaryOutput, ArchiveName);
TemporaryOutput = nullptr;
}
static void createSymbolTable(object::Archive *OldArchive) {
// When an archive is created or modified, if the s option is given, the
// resulting archive will have a current symbol table. If the S option
// is given, it will have no symbol table.
// In summary, we only need to update the symbol table if we have none.
// This is actually very common because of broken build systems that think
// they have to run ranlib.
if (OldArchive->hasSymbolTable())
return;
performWriteOperation(CreateSymTab, OldArchive);
}
static void performOperation(ArchiveOperation Operation,
object::Archive *OldArchive) {
switch (Operation) {
case Print:
case DisplayTable:
case Extract:
performReadOperation(Operation, OldArchive);
return;
case Delete:
case Move:
case QuickAppend:
case ReplaceOrInsert:
performWriteOperation(Operation, OldArchive);
return;
case CreateSymTab:
createSymbolTable(OldArchive);
return;
}
llvm_unreachable("Unknown operation.");
}
static int ar_main(char **argv);
static int ranlib_main();
// main - main program for llvm-ar .. see comments in the code
int main(int argc, char **argv) {
ToolName = argv[0];
// Print a stack trace if we signal out.
sys::PrintStackTraceOnErrorSignal();
PrettyStackTraceProgram X(argc, argv);
llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
// Have the command line options parsed and handle things
// like --help and --version.
cl::ParseCommandLineOptions(argc, argv,
"LLVM Archiver (llvm-ar)\n\n"
" This program archives bitcode files into single libraries\n"
);
llvm::InitializeAllTargetInfos();
llvm::InitializeAllTargetMCs();
llvm::InitializeAllAsmParsers();
StringRef Stem = sys::path::stem(ToolName);
if (Stem.find("ar") != StringRef::npos)
return ar_main(argv);
if (Stem.find("ranlib") != StringRef::npos)
return ranlib_main();
fail("Not ranlib or ar!");
}
static int performOperation(ArchiveOperation Operation);
int ranlib_main() {
if (RestOfArgs.size() != 1)
fail(ToolName + "takes just one archive as argument");
ArchiveName = RestOfArgs[0];
return performOperation(CreateSymTab);
}
int ar_main(char **argv) {
// Do our own parsing of the command line because the CommandLine utility
// can't handle the grouped positional parameters without a dash.
ArchiveOperation Operation = parseCommandLine();
return performOperation(Operation);
}
static int performOperation(ArchiveOperation Operation) {
// Create or open the archive object.
ErrorOr<std::unique_ptr<MemoryBuffer>> Buf =
MemoryBuffer::getFile(ArchiveName, -1, false);
std::error_code EC = Buf.getError();
if (EC && EC != errc::no_such_file_or_directory) {
errs() << ToolName << ": error opening '" << ArchiveName
<< "': " << EC.message() << "!\n";
return 1;
}
if (!EC) {
object::Archive Archive(Buf.get()->getMemBufferRef(), EC);
if (EC) {
errs() << ToolName << ": error loading '" << ArchiveName
<< "': " << EC.message() << "!\n";
return 1;
}
performOperation(Operation, &Archive);
return 0;
}
assert(EC == errc::no_such_file_or_directory);
if (!shouldCreateArchive(Operation)) {
failIfError(EC, Twine("error loading '") + ArchiveName + "'");
} else {
if (!Create) {
// Produce a warning if we should and we're creating the archive
errs() << ToolName << ": creating " << ArchiveName << "\n";
}
}
performOperation(Operation, nullptr);
return 0;
}
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