Reland "[LLVM][llvm-objcopy] Added basic plumbing to get things started"
As discussed on llvm-dev I've implemented the first basic steps towards
llvm-objcopy/llvm-objtool (name pending).
This change adds the ability to copy (without modification) 64-bit
little endian ELF executables that have SHT_PROGBITS, SHT_NOBITS,
SHT_NULL and SHT_STRTAB sections.
Patch by Jake Ehrlich
Differential Revision: https://reviews.llvm.org/D33964
llvm-svn: 309643
diff --git a/llvm/tools/llvm-objcopy/llvm-objcopy.cpp b/llvm/tools/llvm-objcopy/llvm-objcopy.cpp
new file mode 100644
index 0000000..09edc4c
--- /dev/null
+++ b/llvm/tools/llvm-objcopy/llvm-objcopy.cpp
@@ -0,0 +1,96 @@
+//===- 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("-"));
+
+void CopyBinary(const ELFObjectFile<ELF64LE> &ObjFile) {
+ std::unique_ptr<FileOutputBuffer> Buffer;
+ Object<ELF64LE> Obj{ObjFile};
+ 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);
+}