Imported Upstream version 5.18.0.182

Former-commit-id: f9d55cf82631bfd710c387739687e5845296aea1

external/llvm/lib/CodeGen/ParallelCG.cpp

@@ -1,99 +0,0 @@
-//===-- ParallelCG.cpp ----------------------------------------------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This file defines functions that can be used for parallel code generation.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/CodeGen/ParallelCG.h"
-#include "llvm/Bitcode/BitcodeReader.h"
-#include "llvm/Bitcode/BitcodeWriter.h"
-#include "llvm/IR/LLVMContext.h"
-#include "llvm/IR/LegacyPassManager.h"
-#include "llvm/IR/Module.h"
-#include "llvm/Support/ErrorOr.h"
-#include "llvm/Support/MemoryBuffer.h"
-#include "llvm/Support/ThreadPool.h"
-#include "llvm/Target/TargetMachine.h"
-#include "llvm/Transforms/Utils/SplitModule.h"
-
-using namespace llvm;
-
-static void codegen(Module *M, llvm::raw_pwrite_stream &OS,
-                    function_ref<std::unique_ptr<TargetMachine>()> TMFactory,
-                    TargetMachine::CodeGenFileType FileType) {
-  std::unique_ptr<TargetMachine> TM = TMFactory();
-  legacy::PassManager CodeGenPasses;
-  if (TM->addPassesToEmitFile(CodeGenPasses, OS, FileType))
-    report_fatal_error("Failed to setup codegen");
-  CodeGenPasses.run(*M);
-}
-
-std::unique_ptr<Module> llvm::splitCodeGen(
-    std::unique_ptr<Module> M, ArrayRef<llvm::raw_pwrite_stream *> OSs,
-    ArrayRef<llvm::raw_pwrite_stream *> BCOSs,
-    const std::function<std::unique_ptr<TargetMachine>()> &TMFactory,
-    TargetMachine::CodeGenFileType FileType, bool PreserveLocals) {
-  assert(BCOSs.empty() || BCOSs.size() == OSs.size());
-
-  if (OSs.size() == 1) {
-    if (!BCOSs.empty())
-      WriteBitcodeToFile(M.get(), *BCOSs[0]);
-    codegen(M.get(), *OSs[0], TMFactory, FileType);
-    return M;
-  }
-
-  // Create ThreadPool in nested scope so that threads will be joined
-  // on destruction.
-  {
-    ThreadPool CodegenThreadPool(OSs.size());
-    int ThreadCount = 0;
-
-    SplitModule(
-        std::move(M), OSs.size(),
-        [&](std::unique_ptr<Module> MPart) {
-          // We want to clone the module in a new context to multi-thread the
-          // codegen. We do it by serializing partition modules to bitcode
-          // (while still on the main thread, in order to avoid data races) and
-          // spinning up new threads which deserialize the partitions into
-          // separate contexts.
-          // FIXME: Provide a more direct way to do this in LLVM.
-          SmallString<0> BC;
-          raw_svector_ostream BCOS(BC);
-          WriteBitcodeToFile(MPart.get(), BCOS);
-
-          if (!BCOSs.empty()) {
-            BCOSs[ThreadCount]->write(BC.begin(), BC.size());
-            BCOSs[ThreadCount]->flush();
-          }
-
-          llvm::raw_pwrite_stream *ThreadOS = OSs[ThreadCount++];
-          // Enqueue the task
-          CodegenThreadPool.async(
-              [TMFactory, FileType, ThreadOS](const SmallString<0> &BC) {
-                LLVMContext Ctx;
-                Expected<std::unique_ptr<Module>> MOrErr = parseBitcodeFile(
-                    MemoryBufferRef(StringRef(BC.data(), BC.size()),
-                                    "<split-module>"),
-                    Ctx);
-                if (!MOrErr)
-                  report_fatal_error("Failed to read bitcode");
-                std::unique_ptr<Module> MPartInCtx = std::move(MOrErr.get());
-
-                codegen(MPartInCtx.get(), *ThreadOS, TMFactory, FileType);
-              },
-              // Pass BC using std::move to ensure that it get moved rather than
-              // copied into the thread's context.
-              std::move(BC));
-        },
-        PreserveLocals);
-  }
-
-  return {};
-}