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, 0 insertions, 224 deletions

diff --git a/contrib/llvm/lib/Support/Signals.cpp b/contrib/llvm/lib/Support/Signals.cpp
deleted file mode 100644
index 173a07f009d2..000000000000
--- a/contrib/llvm/lib/Support/Signals.cpp
+++ /dev/null
@@ -1,224 +0,0 @@
-//===- Signals.cpp - Signal Handling support --------------------*- C++ -*-===//
-//
-// 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 file defines some helpful functions for dealing with the possibility of
-// Unix signals occurring while your program is running.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/Support/Signals.h"
-#include "llvm/ADT/STLExtras.h"
-#include "llvm/ADT/StringRef.h"
-#include "llvm/Config/llvm-config.h"
-#include "llvm/Support/ErrorOr.h"
-#include "llvm/Support/FileSystem.h"
-#include "llvm/Support/FileUtilities.h"
-#include "llvm/Support/Format.h"
-#include "llvm/Support/FormatVariadic.h"
-#include "llvm/Support/FormatAdapters.h"
-#include "llvm/Support/ManagedStatic.h"
-#include "llvm/Support/MemoryBuffer.h"
-#include "llvm/Support/Mutex.h"
-#include "llvm/Support/Program.h"
-#include "llvm/Support/StringSaver.h"
-#include "llvm/Support/raw_ostream.h"
-#include "llvm/Support/Options.h"
-#include <vector>
-
-//===----------------------------------------------------------------------===//
-//=== WARNING: Implementation here must contain only TRULY operating system
-//===          independent code.
-//===----------------------------------------------------------------------===//
-
-using namespace llvm;
-
-// Use explicit storage to avoid accessing cl::opt in a signal handler.
-static bool DisableSymbolicationFlag = false;
-static cl::opt<bool, true>
-    DisableSymbolication("disable-symbolication",
-                         cl::desc("Disable symbolizing crash backtraces."),
-                         cl::location(DisableSymbolicationFlag), cl::Hidden);
-
-// Callbacks to run in signal handler must be lock-free because a signal handler
-// could be running as we add new callbacks. We don't add unbounded numbers of
-// callbacks, an array is therefore sufficient.
-struct CallbackAndCookie {
-  sys::SignalHandlerCallback Callback;
-  void *Cookie;
-  enum class Status { Empty, Initializing, Initialized, Executing };
-  std::atomic<Status> Flag;
-};
-static constexpr size_t MaxSignalHandlerCallbacks = 8;
-static CallbackAndCookie CallBacksToRun[MaxSignalHandlerCallbacks];
-
-// Signal-safe.
-void sys::RunSignalHandlers() {
-  for (size_t I = 0; I < MaxSignalHandlerCallbacks; ++I) {
-    auto &RunMe = CallBacksToRun[I];
-    auto Expected = CallbackAndCookie::Status::Initialized;
-    auto Desired = CallbackAndCookie::Status::Executing;
-    if (!RunMe.Flag.compare_exchange_strong(Expected, Desired))
-      continue;
-    (*RunMe.Callback)(RunMe.Cookie);
-    RunMe.Callback = nullptr;
-    RunMe.Cookie = nullptr;
-    RunMe.Flag.store(CallbackAndCookie::Status::Empty);
-  }
-}
-
-// Signal-safe.
-static void insertSignalHandler(sys::SignalHandlerCallback FnPtr,
-                                void *Cookie) {
-  for (size_t I = 0; I < MaxSignalHandlerCallbacks; ++I) {
-    auto &SetMe = CallBacksToRun[I];
-    auto Expected = CallbackAndCookie::Status::Empty;
-    auto Desired = CallbackAndCookie::Status::Initializing;
-    if (!SetMe.Flag.compare_exchange_strong(Expected, Desired))
-      continue;
-    SetMe.Callback = FnPtr;
-    SetMe.Cookie = Cookie;
-    SetMe.Flag.store(CallbackAndCookie::Status::Initialized);
-    return;
-  }
-  report_fatal_error("too many signal callbacks already registered");
-}
-
-static bool findModulesAndOffsets(void **StackTrace, int Depth,
-                                  const char **Modules, intptr_t *Offsets,
-                                  const char *MainExecutableName,
-                                  StringSaver &StrPool);
-
-/// Format a pointer value as hexadecimal. Zero pad it out so its always the
-/// same width.
-static FormattedNumber format_ptr(void *PC) {
-  // Each byte is two hex digits plus 2 for the 0x prefix.
-  unsigned PtrWidth = 2 + 2 * sizeof(void *);
-  return format_hex((uint64_t)PC, PtrWidth);
-}
-
-/// Helper that launches llvm-symbolizer and symbolizes a backtrace.
-LLVM_ATTRIBUTE_USED
-static bool printSymbolizedStackTrace(StringRef Argv0, void **StackTrace,
-                                      int Depth, llvm::raw_ostream &OS) {
-  if (DisableSymbolicationFlag)
-    return false;
-
-  // Don't recursively invoke the llvm-symbolizer binary.
-  if (Argv0.find("llvm-symbolizer") != std::string::npos)
-    return false;
-
-  // FIXME: Subtract necessary number from StackTrace entries to turn return addresses
-  // into actual instruction addresses.
-  // Use llvm-symbolizer tool to symbolize the stack traces. First look for it
-  // alongside our binary, then in $PATH.
-  ErrorOr<std::string> LLVMSymbolizerPathOrErr = std::error_code();
-  if (!Argv0.empty()) {
-    StringRef Parent = llvm::sys::path::parent_path(Argv0);
-    if (!Parent.empty())
-      LLVMSymbolizerPathOrErr = sys::findProgramByName("llvm-symbolizer", Parent);
-  }
-  if (!LLVMSymbolizerPathOrErr)
-    LLVMSymbolizerPathOrErr = sys::findProgramByName("llvm-symbolizer");
-  if (!LLVMSymbolizerPathOrErr)
-    return false;
-  const std::string &LLVMSymbolizerPath = *LLVMSymbolizerPathOrErr;
-
-  // If we don't know argv0 or the address of main() at this point, try
-  // to guess it anyway (it's possible on some platforms).
-  std::string MainExecutableName =
-      sys::fs::exists(Argv0) ? (std::string)Argv0
-                             : sys::fs::getMainExecutable(nullptr, nullptr);
-  BumpPtrAllocator Allocator;
-  StringSaver StrPool(Allocator);
-  std::vector<const char *> Modules(Depth, nullptr);
-  std::vector<intptr_t> Offsets(Depth, 0);
-  if (!findModulesAndOffsets(StackTrace, Depth, Modules.data(), Offsets.data(),
-                             MainExecutableName.c_str(), StrPool))
-    return false;
-  int InputFD;
-  SmallString<32> InputFile, OutputFile;
-  sys::fs::createTemporaryFile("symbolizer-input", "", InputFD, InputFile);
-  sys::fs::createTemporaryFile("symbolizer-output", "", OutputFile);
-  FileRemover InputRemover(InputFile.c_str());
-  FileRemover OutputRemover(OutputFile.c_str());
-
-  {
-    raw_fd_ostream Input(InputFD, true);
-    for (int i = 0; i < Depth; i++) {
-      if (Modules[i])
-        Input << Modules[i] << " " << (void*)Offsets[i] << "\n";
-    }
-  }
-
-  Optional<StringRef> Redirects[] = {StringRef(InputFile),
-                                     StringRef(OutputFile), StringRef("")};
-  StringRef Args[] = {"llvm-symbolizer", "--functions=linkage", "--inlining",
-#ifdef _WIN32
-                      // Pass --relative-address on Windows so that we don't
-                      // have to add ImageBase from PE file.
-                      // FIXME: Make this the default for llvm-symbolizer.
-                      "--relative-address",
-#endif
-                      "--demangle"};
-  int RunResult =
-      sys::ExecuteAndWait(LLVMSymbolizerPath, Args, None, Redirects);
-  if (RunResult != 0)
-    return false;
-
-  // This report format is based on the sanitizer stack trace printer.  See
-  // sanitizer_stacktrace_printer.cc in compiler-rt.
-  auto OutputBuf = MemoryBuffer::getFile(OutputFile.c_str());
-  if (!OutputBuf)
-    return false;
-  StringRef Output = OutputBuf.get()->getBuffer();
-  SmallVector<StringRef, 32> Lines;
-  Output.split(Lines, "\n");
-  auto CurLine = Lines.begin();
-  int frame_no = 0;
-  for (int i = 0; i < Depth; i++) {
-    auto PrintLineHeader = [&]() {
-      OS << right_justify(formatv("#{0}", frame_no++).str(),
-                          std::log10(Depth) + 2)
-         << ' ' << format_ptr(StackTrace[i]) << ' ';
-    };
-    if (!Modules[i]) {
-      PrintLineHeader();
-      OS << '\n';
-      continue;
-    }
-    // Read pairs of lines (function name and file/line info) until we
-    // encounter empty line.
-    for (;;) {
-      if (CurLine == Lines.end())
-        return false;
-      StringRef FunctionName = *CurLine++;
-      if (FunctionName.empty())
-        break;
-      PrintLineHeader();
-      if (!FunctionName.startswith("??"))
-        OS << FunctionName << ' ';
-      if (CurLine == Lines.end())
-        return false;
-      StringRef FileLineInfo = *CurLine++;
-      if (!FileLineInfo.startswith("??"))
-        OS << FileLineInfo;
-      else
-        OS << "(" << Modules[i] << '+' << format_hex(Offsets[i], 0) << ")";
-      OS << "\n";
-    }
-  }
-  return true;
-}
-
-// Include the platform-specific parts of this class.
-#ifdef LLVM_ON_UNIX
-#include "Unix/Signals.inc"
-#endif
-#ifdef _WIN32
-#include "Windows/Signals.inc"
-#endif