Add llvm-rs-as tool.
This tool takes an .ll file as input and generates bitcode from it.
The -bitcode-version flags allows to specify the version of the
bitcode that should be emitted.
Change-Id: I08b4f1fd0d7b218613e217249e648c9ca4393e38
diff --git a/llvm-rs-as.cpp b/llvm-rs-as.cpp
new file mode 100644
index 0000000..979c28a
--- /dev/null
+++ b/llvm-rs-as.cpp
@@ -0,0 +1,151 @@
+//===--- llvm-as.cpp - The low-level LLVM assembler -----------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This utility may be invoked in the following manner:
+// llvm-as --help - Output information about command line switches
+// llvm-as [options] - Read LLVM asm from stdin, write bitcode to stdout
+// llvm-as [options] x.ll - Read LLVM asm from the x.ll file, write bitcode
+// to the x.bc file.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/IR/LLVMContext.h"
+#include "llvm/Analysis/Verifier.h"
+#include "llvm/Assembly/Parser.h"
+#include "llvm/Bitcode/ReaderWriter.h"
+#include "llvm/IR/Module.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/ManagedStatic.h"
+#include "llvm/Support/PrettyStackTrace.h"
+#include "llvm/Support/Signals.h"
+#include "llvm/Support/SourceMgr.h"
+#include "llvm/Support/SystemUtils.h"
+#include "llvm/Support/ToolOutputFile.h"
+
+#include "BitWriter_3_2/ReaderWriter_3_2.h"
+#include "BitWriter_2_9/ReaderWriter_2_9.h"
+#include "BitWriter_2_9_func/ReaderWriter_2_9_func.h"
+
+#include <memory>
+using namespace llvm;
+
+static cl::opt<std::string>
+InputFilename(cl::Positional, cl::desc("<input .llvm file>"), cl::init("-"));
+
+static cl::opt<std::string>
+OutputFilename("o", cl::desc("Override output filename"),
+ cl::value_desc("filename"));
+
+static cl::opt<bool>
+Force("f", cl::desc("Enable binary output on terminals"));
+
+static cl::opt<bool>
+DisableOutput("disable-output", cl::desc("Disable output"), cl::init(false));
+
+static cl::opt<bool>
+DumpAsm("d", cl::desc("Print assembly as parsed"), cl::Hidden);
+
+static cl::opt<bool>
+DisableVerify("disable-verify", cl::Hidden,
+ cl::desc("Do not run verifier on input LLVM (dangerous!)"));
+
+enum BCVersion {
+ BC29, BC29Func, BC32, BCHEAD
+};
+
+cl::opt<BCVersion> BitcodeVersion("bitcode-version",
+ cl::desc("Set the bitcode version to be written:"),
+ cl::values(
+ clEnumValN(BC29, "BC29", "Version 2.9"),
+ clEnumVal(BC29Func, "Version 2.9 func"),
+ clEnumVal(BC32, "Version 3.2"),
+ clEnumVal(BCHEAD, "Most current version"),
+ clEnumValEnd), cl::init(BC32));
+
+static void WriteOutputFile(const Module *M) {
+ // Infer the output filename if needed.
+ if (OutputFilename.empty()) {
+ if (InputFilename == "-") {
+ OutputFilename = "-";
+ } else {
+ std::string IFN = InputFilename;
+ int Len = IFN.length();
+ if (IFN[Len-3] == '.' && IFN[Len-2] == 'l' && IFN[Len-1] == 'l') {
+ // Source ends in .ll
+ OutputFilename = std::string(IFN.begin(), IFN.end()-3);
+ } else {
+ OutputFilename = IFN; // Append a .bc to it
+ }
+ OutputFilename += ".bc";
+ }
+ }
+
+ std::string ErrorInfo;
+ OwningPtr<tool_output_file> Out
+ (new tool_output_file(OutputFilename.c_str(), ErrorInfo,
+ raw_fd_ostream::F_Binary));
+ if (!ErrorInfo.empty()) {
+ errs() << ErrorInfo << '\n';
+ exit(1);
+ }
+
+ if (Force || !CheckBitcodeOutputToConsole(Out->os(), true)) {
+ switch(BitcodeVersion) {
+ case BC29:
+ llvm_2_9::WriteBitcodeToFile(M, Out->os());
+ break;
+ case BC29Func:
+ llvm_2_9_func::WriteBitcodeToFile(M, Out->os());
+ break;
+ case BC32:
+ llvm_3_2::WriteBitcodeToFile(M, Out->os());
+ break;
+ case BCHEAD:
+ llvm::WriteBitcodeToFile(M, Out->os());
+ break;
+ }
+ }
+
+ // Declare success.
+ Out->keep();
+}
+
+int main(int argc, char **argv) {
+ // Print a stack trace if we signal out.
+ sys::PrintStackTraceOnErrorSignal();
+ PrettyStackTraceProgram X(argc, argv);
+ LLVMContext &Context = getGlobalContext();
+ llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
+ cl::ParseCommandLineOptions(argc, argv, "llvm .ll -> .bc assembler\n");
+
+ // Parse the file now...
+ SMDiagnostic Err;
+ OwningPtr<Module> M(ParseAssemblyFile(InputFilename, Err, Context));
+ if (M.get() == 0) {
+ Err.print(argv[0], errs());
+ return 1;
+ }
+
+ if (!DisableVerify) {
+ std::string Err;
+ if (verifyModule(*M.get(), ReturnStatusAction, &Err)) {
+ errs() << argv[0]
+ << ": assembly parsed, but does not verify as correct!\n";
+ errs() << Err;
+ return 1;
+ }
+ }
+
+ if (DumpAsm) errs() << "Here's the assembly:\n" << *M.get();
+
+ if (!DisableOutput)
+ WriteOutputFile(M.get());
+
+ return 0;
+}