//===-- 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/ADT/Triple.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "llvm/LibDriver/LibDriver.h"
#include "llvm/Object/Archive.h"
#include "llvm/Object/ArchiveWriter.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/Path.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;
// Show the error message and exit.
LLVM_ATTRIBUTE_NORETURN static void fail(Twine Error) {
outs() << ToolName << ": " << Error << ".\n";
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(""));
namespace {
enum Format { Default, GNU, BSD };
}
static cl::opt<Format>
FormatOpt("format", cl::desc("Archive format to create"),
cl::values(clEnumValN(Default, "defalut", "default"),
clEnumValN(GNU, "gnu", "gnu"),
clEnumValN(BSD, "bsd", "bsd"), clEnumValEnd));
static std::string Options;
// 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"
" [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
static bool Deterministic = true; ///< 'D' and 'U' modifiers
static bool Thin = false; ///< 'T' 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<StringRef> Members;
// 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);
}
// 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());
}
// 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());
}
// Copy over remaining items in RestOfArgs to our Members vector
static void getMembers() {
for (auto &Arg : RestOfArgs)
Members.push_back(Arg);
}
static void runMRIScript();
// 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");
runMRIScript();
}
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;
case 'D':
Deterministic = true;
break;
case 'U':
Deterministic = false;
break;
case 'T':
Thin = true;
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, const object::Archive::Child &C) {
if (Verbose)
outs() << "Printing " << Name << "\n";
ErrorOr<StringRef> DataOrErr = C.getBuffer();
failIfError(DataOrErr.getError());
StringRef Data = *DataOrErr;
outs().write(Data.data(), Data.size());
}
// Utility function for printing out the file mode when the 't' operation is in
// verbose mode.
static void printMode(unsigned mode) {
outs() << ((mode & 004) ? "r" : "-");
outs() << ((mode & 002) ? "w" : "-");
outs() << ((mode & 001) ? "x" : "-");
}
// 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, const object::Archive::Child &C) {
if (Verbose) {
sys::fs::perms Mode = C.getAccessMode();
printMode((Mode >> 6) & 007);
printMode((Mode >> 3) & 007);
printMode(Mode & 007);
outs() << ' ' << C.getUID();
outs() << '/' << C.getGID();
ErrorOr<uint64_t> Size = C.getSize();
failIfError(Size.getError());
outs() << ' ' << format("%6llu", Size.get());
outs() << ' ' << C.getLastModified().str();
outs() << ' ';
}
outs() << Name << "\n";
}
// Implement the 'x' operation. This function extracts files back to the file
// system.
static void doExtract(StringRef Name, const object::Archive::Child &C) {
// Retain the original mode.
sys::fs::perms Mode = C.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 = *C.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, C.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) {
if (Operation == Extract && OldArchive->isThin())
fail("extracting from a thin archive is not supported");
bool Filter = !Members.empty();
for (auto &ChildOrErr : OldArchive->children()) {
failIfError(ChildOrErr.getError());
const object::Archive::Child &C = *ChildOrErr;
ErrorOr<StringRef> NameOrErr = C.getName();
failIfError(NameOrErr.getError());
StringRef Name = NameOrErr.get();
if (Filter) {
auto I = std::find(Members.begin(), Members.end(), Name);
if (I == Members.end())
continue;
Members.erase(I);
}
switch (Operation) {
default:
llvm_unreachable("Not a read operation");
case Print:
doPrint(Name, C);
break;
case DisplayTable:
doDisplayTable(Name, C);
break;
case Extract:
doExtract(Name, C);
break;
}
}
if (Members.empty())
return;
for (StringRef Name : Members)
errs() << Name << " was not found\n";
std::exit(1);
}
static void addMember(std::vector<NewArchiveIterator> &Members,
StringRef FileName, int Pos = -1) {
NewArchiveIterator NI(FileName);
if (Pos == -1)
Members.push_back(NI);
else
Members[Pos] = NI;
}
static void addMember(std::vector<NewArchiveIterator> &Members,
const object::Archive::Child &M, StringRef Name,
int Pos = -1) {
if (Thin && !M.getParent()->isThin())
fail("Cannot convert a regular archive to a thin one");
NewArchiveIterator NI(M, 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,
const object::Archive::Child &Member,
StringRef Name,
std::vector<StringRef>::iterator &Pos) {
if (Operation == QuickAppend || Members.empty())
return IA_AddOldMember;
auto 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() < Member.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 (auto &ChildOrErr : OldArchive->children()) {
failIfError(ChildOrErr.getError());
auto &Child = ChildOrErr.get();
int Pos = Ret.size();
ErrorOr<StringRef> NameOrErr = Child.getName();
failIfError(NameOrErr.getError());
StringRef Name = NameOrErr.get();
if (Name == PosName) {
assert(AddAfter || AddBefore);
if (AddBefore)
InsertPos = Pos;
else
InsertPos = Pos + 1;
}
std::vector<StringRef>::iterator MemberI = Members.end();
InsertAction Action =
computeInsertAction(Operation, Child, Name, MemberI);
switch (Action) {
case IA_AddOldMember:
addMember(Ret, Child, Name);
break;
case IA_AddNewMeber:
addMember(Ret, *MemberI);
break;
case IA_Delete:
break;
case IA_MoveOldMember:
addMember(Moved, Child, Name);
break;
case IA_MoveNewMember:
addMember(Moved, *MemberI);
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 (auto &Member : Members) {
addMember(Ret, Member, Pos);
++Pos;
}
return Ret;
}
static void
performWriteOperation(ArchiveOperation Operation, object::Archive *OldArchive,
std::vector<NewArchiveIterator> *NewMembersP) {
object::Archive::Kind Kind;
switch (FormatOpt) {
case Default: {
Triple T(sys::getProcessTriple());
if (T.isOSDarwin())
Kind = object::Archive::K_BSD;
else
Kind = object::Archive::K_GNU;
break;
}
case GNU:
Kind = object::Archive::K_GNU;
break;
case BSD:
Kind = object::Archive::K_BSD;
break;
}
if (NewMembersP) {
std::pair<StringRef, std::error_code> Result = writeArchive(
ArchiveName, *NewMembersP, Symtab, Kind, Deterministic, Thin);
failIfError(Result.second, Result.first);
return;
}
std::vector<NewArchiveIterator> NewMembers =
computeNewArchiveMembers(Operation, OldArchive);
auto Result =
writeArchive(ArchiveName, NewMembers, Symtab, Kind, Deterministic, Thin);
failIfError(Result.second, Result.first);
}
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, nullptr);
}
static void performOperation(ArchiveOperation Operation,
object::Archive *OldArchive,
std::vector<NewArchiveIterator> *NewMembers) {
switch (Operation) {
case Print:
case DisplayTable:
case Extract:
performReadOperation(Operation, OldArchive);
return;
case Delete:
case Move:
case QuickAppend:
case ReplaceOrInsert:
performWriteOperation(Operation, OldArchive, NewMembers);
return;
case CreateSymTab:
createSymbolTable(OldArchive);
return;
}
llvm_unreachable("Unknown operation.");
}
static int performOperation(ArchiveOperation Operation,
std::vector<NewArchiveIterator> *NewMembers) {
// 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)
fail("error opening '" + ArchiveName + "': " + EC.message() + "!");
if (!EC) {
object::Archive Archive(Buf.get()->getMemBufferRef(), EC);
failIfError(EC,
"error loading '" + ArchiveName + "': " + EC.message() + "!");
performOperation(Operation, &Archive, NewMembers);
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, NewMembers);
return 0;
}
static void runMRIScript() {
enum class MRICommand { AddLib, AddMod, Create, Save, End, Invalid };
ErrorOr<std::unique_ptr<MemoryBuffer>> Buf = MemoryBuffer::getSTDIN();
failIfError(Buf.getError());
const MemoryBuffer &Ref = *Buf.get();
bool Saved = false;
std::vector<NewArchiveIterator> NewMembers;
std::vector<std::unique_ptr<MemoryBuffer>> ArchiveBuffers;
std::vector<std::unique_ptr<object::Archive>> Archives;
for (line_iterator I(Ref, /*SkipBlanks*/ true, ';'), E; I != E; ++I) {
StringRef Line = *I;
StringRef CommandStr, Rest;
std::tie(CommandStr, Rest) = Line.split(' ');
Rest = Rest.trim();
if (!Rest.empty() && Rest.front() == '"' && Rest.back() == '"')
Rest = Rest.drop_front().drop_back();
auto Command = StringSwitch<MRICommand>(CommandStr.lower())
.Case("addlib", MRICommand::AddLib)
.Case("addmod", MRICommand::AddMod)
.Case("create", MRICommand::Create)
.Case("save", MRICommand::Save)
.Case("end", MRICommand::End)
.Default(MRICommand::Invalid);
switch (Command) {
case MRICommand::AddLib: {
auto BufOrErr = MemoryBuffer::getFile(Rest, -1, false);
failIfError(BufOrErr.getError(), "Could not open library");
ArchiveBuffers.push_back(std::move(*BufOrErr));
auto LibOrErr =
object::Archive::create(ArchiveBuffers.back()->getMemBufferRef());
failIfError(LibOrErr.getError(), "Could not parse library");
Archives.push_back(std::move(*LibOrErr));
object::Archive &Lib = *Archives.back();
for (auto &MemberOrErr : Lib.children()) {
failIfError(MemberOrErr.getError());
auto &Member = MemberOrErr.get();
ErrorOr<StringRef> NameOrErr = Member.getName();
failIfError(NameOrErr.getError());
addMember(NewMembers, Member, *NameOrErr);
}
break;
}
case MRICommand::AddMod:
addMember(NewMembers, Rest);
break;
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)
performOperation(ReplaceOrInsert, &NewMembers);
exit(0);
}
static int ar_main() {
// 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, nullptr);
}
static int ranlib_main() {
if (RestOfArgs.size() != 1)
fail(ToolName + "takes just one archive as argument");
ArchiveName = RestOfArgs[0];
return performOperation(CreateSymTab, nullptr);
}
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.
llvm::InitializeAllTargetInfos();
llvm::InitializeAllTargetMCs();
llvm::InitializeAllAsmParsers();
StringRef Stem = sys::path::stem(ToolName);
if (Stem.find("ranlib") == StringRef::npos &&
Stem.find("lib") != StringRef::npos)
return libDriverMain(makeArrayRef(argv, argc));
// 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"
);
if (Stem.find("ranlib") != StringRef::npos)
return ranlib_main();
if (Stem.find("ar") != StringRef::npos)
return ar_main();
fail("Not ranlib, ar or lib!");
}