Move all sources from the llvm project into contrib/llvm-project.

This uses the new layout of the upstream repository, which was recently
migrated to GitHub, and converted into a "monorepo".  That is, most of
the earlier separate sub-projects with their own branches and tags were
consolidated into one top-level directory, and are now branched and
tagged together.

Updating the vendor area to match this layout is next.

1 files changed, 153 insertions, 0 deletions

diff --git a/contrib/llvm-project/llvm/tools/llvm-as/llvm-as.cpp b/contrib/llvm-project/llvm/tools/llvm-as/llvm-as.cpp
new file mode 100644
index 000000000000..234fef907a38
--- /dev/null
+++ b/contrib/llvm-project/llvm/tools/llvm-as/llvm-as.cpp
@@ -0,0 +1,153 @@
+//===--- llvm-as.cpp - The low-level LLVM assembler -----------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+//  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/AsmParser/Parser.h"
+#include "llvm/Bitcode/BitcodeWriter.h"
+#include "llvm/IR/LLVMContext.h"
+#include "llvm/IR/Module.h"
+#include "llvm/IR/ModuleSummaryIndex.h"
+#include "llvm/IR/Verifier.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/InitLLVM.h"
+#include "llvm/Support/ManagedStatic.h"
+#include "llvm/Support/SourceMgr.h"
+#include "llvm/Support/SystemUtils.h"
+#include "llvm/Support/ToolOutputFile.h"
+#include <memory>
+using namespace llvm;
+
+cl::OptionCategory AsCat("llvm-as Options");
+
+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"),
+                                           cl::cat(AsCat));
+
+static cl::opt<bool> Force("f", cl::desc("Enable binary output on terminals"),
+                           cl::cat(AsCat));
+
+static cl::opt<bool> DisableOutput("disable-output", cl::desc("Disable output"),
+                                   cl::init(false), cl::cat(AsCat));
+
+static cl::opt<bool> EmitModuleHash("module-hash", cl::desc("Emit module hash"),
+                                    cl::init(false), cl::cat(AsCat));
+
+static cl::opt<bool> DumpAsm("d", cl::desc("Print assembly as parsed"),
+                             cl::Hidden, cl::cat(AsCat));
+
+static cl::opt<bool>
+    DisableVerify("disable-verify", cl::Hidden,
+                  cl::desc("Do not run verifier on input LLVM (dangerous!)"),
+                  cl::cat(AsCat));
+
+static cl::opt<bool> PreserveBitcodeUseListOrder(
+    "preserve-bc-uselistorder",
+    cl::desc("Preserve use-list order when writing LLVM bitcode."),
+    cl::init(true), cl::Hidden, cl::cat(AsCat));
+
+static cl::opt<std::string> ClDataLayout("data-layout",
+                                         cl::desc("data layout string to use"),
+                                         cl::value_desc("layout-string"),
+                                         cl::init(""), cl::cat(AsCat));
+
+static void WriteOutputFile(const Module *M, const ModuleSummaryIndex *Index) {
+  // Infer the output filename if needed.
+  if (OutputFilename.empty()) {
+    if (InputFilename == "-") {
+      OutputFilename = "-";
+    } else {
+      StringRef IFN = InputFilename;
+      OutputFilename = (IFN.endswith(".ll") ? IFN.drop_back(3) : IFN).str();
+      OutputFilename += ".bc";
+    }
+  }
+
+  std::error_code EC;
+  std::unique_ptr<ToolOutputFile> Out(
+      new ToolOutputFile(OutputFilename, EC, sys::fs::F_None));
+  if (EC) {
+    errs() << EC.message() << '\n';
+    exit(1);
+  }
+
+  if (Force || !CheckBitcodeOutputToConsole(Out->os(), true)) {
+    const ModuleSummaryIndex *IndexToWrite = nullptr;
+    // Don't attempt to write a summary index unless it contains any entries.
+    // Otherwise we get an empty summary section.
+    if (Index && Index->begin() != Index->end())
+      IndexToWrite = Index;
+    if (!IndexToWrite || (M && (!M->empty() || !M->global_empty())))
+      // If we have a non-empty Module, then we write the Module plus
+      // any non-null Index along with it as a per-module Index.
+      // If both are empty, this will give an empty module block, which is
+      // the expected behavior.
+      WriteBitcodeToFile(*M, Out->os(), PreserveBitcodeUseListOrder,
+                         IndexToWrite, EmitModuleHash);
+    else
+      // Otherwise, with an empty Module but non-empty Index, we write a
+      // combined index.
+      WriteIndexToFile(*IndexToWrite, Out->os());
+  }
+
+  // Declare success.
+  Out->keep();
+}
+
+int main(int argc, char **argv) {
+  InitLLVM X(argc, argv);
+  LLVMContext Context;
+  cl::HideUnrelatedOptions(AsCat);
+  cl::ParseCommandLineOptions(argc, argv, "llvm .ll -> .bc assembler\n");
+
+  // Parse the file now...
+  SMDiagnostic Err;
+  auto ModuleAndIndex = parseAssemblyFileWithIndex(
+      InputFilename, Err, Context, nullptr, !DisableVerify, ClDataLayout);
+  std::unique_ptr<Module> M = std::move(ModuleAndIndex.Mod);
+  if (!M.get()) {
+    Err.print(argv[0], errs());
+    return 1;
+  }
+  std::unique_ptr<ModuleSummaryIndex> Index = std::move(ModuleAndIndex.Index);
+
+  if (!DisableVerify) {
+    std::string ErrorStr;
+    raw_string_ostream OS(ErrorStr);
+    if (verifyModule(*M.get(), &OS)) {
+      errs() << argv[0]
+             << ": assembly parsed, but does not verify as correct!\n";
+      errs() << OS.str();
+      return 1;
+    }
+    // TODO: Implement and call summary index verifier.
+  }
+
+  if (DumpAsm) {
+    errs() << "Here's the assembly:\n" << *M.get();
+    if (Index.get() && Index->begin() != Index->end())
+      Index->print(errs());
+  }
+
+  if (!DisableOutput)
+    WriteOutputFile(M.get(), Index.get());
+
+  return 0;
+}