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//===- llvm-objcopy.cpp -----------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm-objcopy.h"
#include "Object.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/FileOutputBuffer.h"
#include "llvm/Support/PrettyStackTrace.h"
#include "llvm/Support/Signals.h"
#include "llvm/Support/ToolOutputFile.h"
#include <memory>
#include <string>
#include <system_error>
using namespace llvm;
using namespace object;
using namespace ELF;
// The name this program was invoked as.
static StringRef ToolName;
namespace llvm {
LLVM_ATTRIBUTE_NORETURN void error(Twine Message) {
errs() << ToolName << ": " << Message << ".\n";
errs().flush();
exit(1);
}
LLVM_ATTRIBUTE_NORETURN void reportError(StringRef File, std::error_code EC) {
assert(EC);
errs() << ToolName << ": '" << File << "': " << EC.message() << ".\n";
exit(1);
}
LLVM_ATTRIBUTE_NORETURN void reportError(StringRef File, llvm::Error E) {
assert(E);
std::string Buf;
raw_string_ostream OS(Buf);
logAllUnhandledErrors(std::move(E), OS, "");
OS.flush();
errs() << ToolName << ": '" << File << "': " << Buf;
exit(1);
}
}
cl::opt<std::string> InputFilename(cl::Positional, cl::desc("<input>"));
cl::opt<std::string> OutputFilename(cl::Positional, cl::desc("<output>"),
cl::init("-"));
cl::opt<std::string>
OutputFormat("O", cl::desc("set output format to one of the following:"
"\n\tbinary"));
cl::list<std::string> ToRemove("remove-section",
cl::desc("Remove a specific section"));
cl::alias ToRemoveA("R", cl::desc("Alias for remove-section"),
cl::aliasopt(ToRemove));
cl::opt<bool> StripSections("strip-sections",
cl::desc("Remove all section headers"));
typedef std::function<bool(const SectionBase &Sec)> SectionPred;
void CopyBinary(const ELFObjectFile<ELF64LE> &ObjFile) {
std::unique_ptr<FileOutputBuffer> Buffer;
std::unique_ptr<Object<ELF64LE>> Obj;
if (!OutputFormat.empty() && OutputFormat != "binary")
error("invalid output format '" + OutputFormat + "'");
if (!OutputFormat.empty() && OutputFormat == "binary")
Obj = llvm::make_unique<BinaryObject<ELF64LE>>(ObjFile);
else
Obj = llvm::make_unique<ELFObject<ELF64LE>>(ObjFile);
SectionPred RemovePred = [](const SectionBase &) { return false; };
if (!ToRemove.empty()) {
RemovePred = [&](const SectionBase &Sec) {
return std::find(std::begin(ToRemove), std::end(ToRemove), Sec.Name) !=
std::end(ToRemove);
};
}
if (StripSections) {
RemovePred = [RemovePred](const SectionBase &Sec) {
return RemovePred(Sec) || (Sec.Flags & SHF_ALLOC) == 0;
};
Obj->WriteSectionHeaders = false;
}
Obj->removeSections(RemovePred);
Obj->finalize();
ErrorOr<std::unique_ptr<FileOutputBuffer>> BufferOrErr =
FileOutputBuffer::create(OutputFilename, Obj->totalSize(),
FileOutputBuffer::F_executable);
if (BufferOrErr.getError())
error("failed to open " + OutputFilename);
else
Buffer = std::move(*BufferOrErr);
std::error_code EC;
if (EC)
report_fatal_error(EC.message());
Obj->write(*Buffer);
if (auto EC = Buffer->commit())
reportError(OutputFilename, EC);
}
int main(int argc, char **argv) {
// Print a stack trace if we signal out.
sys::PrintStackTraceOnErrorSignal(argv[0]);
PrettyStackTraceProgram X(argc, argv);
llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
cl::ParseCommandLineOptions(argc, argv, "llvm objcopy utility\n");
ToolName = argv[0];
if (InputFilename.empty()) {
cl::PrintHelpMessage();
return 2;
}
Expected<OwningBinary<Binary>> BinaryOrErr = createBinary(InputFilename);
if (!BinaryOrErr)
reportError(InputFilename, BinaryOrErr.takeError());
Binary &Binary = *BinaryOrErr.get().getBinary();
if (ELFObjectFile<ELF64LE> *o = dyn_cast<ELFObjectFile<ELF64LE>>(&Binary)) {
CopyBinary(*o);
return 0;
}
reportError(InputFilename, object_error::invalid_file_type);
}
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