forked from OSchip/llvm-project
127 lines
4.2 KiB
C++
127 lines
4.2 KiB
C++
//===--- llvm-as.cpp - The low-level LLVM assembler -----------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This utility may be invoked in the following manner:
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// llvm-as --help - Output information about command line switches
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// llvm-as [options] - Read LLVM asm from stdin, write bitcode to stdout
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// llvm-as [options] x.ll - Read LLVM asm from the x.ll file, write bitcode
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// to the x.bc file.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/AsmParser/Parser.h"
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#include "llvm/Bitcode/BitcodeWriter.h"
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#include "llvm/IR/LLVMContext.h"
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#include "llvm/IR/Module.h"
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#include "llvm/IR/Verifier.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/InitLLVM.h"
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#include "llvm/Support/ManagedStatic.h"
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#include "llvm/Support/SourceMgr.h"
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#include "llvm/Support/SystemUtils.h"
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#include "llvm/Support/ToolOutputFile.h"
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#include <memory>
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using namespace llvm;
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static cl::opt<std::string> InputFilename(cl::Positional,
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cl::desc("<input .llvm file>"),
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cl::init("-"));
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static cl::opt<std::string> OutputFilename("o",
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cl::desc("Override output filename"),
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cl::value_desc("filename"));
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static cl::opt<bool> Force("f", cl::desc("Enable binary output on terminals"));
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static cl::opt<bool> DisableOutput("disable-output", cl::desc("Disable output"),
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cl::init(false));
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static cl::opt<bool> EmitModuleHash("module-hash", cl::desc("Emit module hash"),
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cl::init(false));
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static cl::opt<bool> DumpAsm("d", cl::desc("Print assembly as parsed"),
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cl::Hidden);
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static cl::opt<bool>
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DisableVerify("disable-verify", cl::Hidden,
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cl::desc("Do not run verifier on input LLVM (dangerous!)"));
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static cl::opt<bool> PreserveBitcodeUseListOrder(
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"preserve-bc-uselistorder",
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cl::desc("Preserve use-list order when writing LLVM bitcode."),
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cl::init(true), cl::Hidden);
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static cl::opt<std::string> ClDataLayout("data-layout",
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cl::desc("data layout string to use"),
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cl::value_desc("layout-string"),
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cl::init(""));
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static void WriteOutputFile(const Module *M) {
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// Infer the output filename if needed.
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if (OutputFilename.empty()) {
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if (InputFilename == "-") {
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OutputFilename = "-";
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} else {
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StringRef IFN = InputFilename;
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OutputFilename = (IFN.endswith(".ll") ? IFN.drop_back(3) : IFN).str();
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OutputFilename += ".bc";
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}
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}
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std::error_code EC;
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std::unique_ptr<ToolOutputFile> Out(
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new ToolOutputFile(OutputFilename, EC, sys::fs::F_None));
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if (EC) {
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errs() << EC.message() << '\n';
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exit(1);
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}
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if (Force || !CheckBitcodeOutputToConsole(Out->os(), true))
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WriteBitcodeToFile(*M, Out->os(), PreserveBitcodeUseListOrder, nullptr,
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EmitModuleHash);
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// Declare success.
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Out->keep();
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}
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int main(int argc, char **argv) {
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InitLLVM X(argc, argv);
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LLVMContext Context;
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cl::ParseCommandLineOptions(argc, argv, "llvm .ll -> .bc assembler\n");
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// Parse the file now...
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SMDiagnostic Err;
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std::unique_ptr<Module> M = parseAssemblyFile(
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InputFilename, Err, Context, nullptr, !DisableVerify, ClDataLayout);
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if (!M.get()) {
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Err.print(argv[0], errs());
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return 1;
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}
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if (!DisableVerify) {
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std::string ErrorStr;
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raw_string_ostream OS(ErrorStr);
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if (verifyModule(*M.get(), &OS)) {
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errs() << argv[0]
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<< ": assembly parsed, but does not verify as correct!\n";
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errs() << OS.str();
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return 1;
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}
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}
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if (DumpAsm)
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errs() << "Here's the assembly:\n" << *M.get();
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if (!DisableOutput)
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WriteOutputFile(M.get());
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return 0;
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}
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