Initial commit with LLVM 3.4.1, cfe 3.4.1 and compiler-rt 3.4

lib/Support/ErrorHandling.cpp

@@ -0,0 +1,121 @@
+//===- lib/Support/ErrorHandling.cpp - Callbacks for errors ---------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines an API used to indicate fatal error conditions.  Non-fatal
+// errors (most of them) should be handled through LLVMContext.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/Twine.h"
+#include "llvm/Config/config.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/Signals.h"
+#include "llvm/Support/Threading.h"
+#include "llvm/Support/raw_ostream.h"
+#include "llvm-c/Core.h"
+#include <cassert>
+#include <cstdlib>
+
+#if defined(HAVE_UNISTD_H)
+# include <unistd.h>
+#endif
+#if defined(_MSC_VER)
+# include <io.h>
+# include <fcntl.h>
+#endif
+
+using namespace llvm;
+
+static fatal_error_handler_t ErrorHandler = 0;
+static void *ErrorHandlerUserData = 0;
+
+void llvm::install_fatal_error_handler(fatal_error_handler_t handler,
+                                       void *user_data) {
+  assert(!llvm_is_multithreaded() &&
+         "Cannot register error handlers after starting multithreaded mode!\n");
+  assert(!ErrorHandler && "Error handler already registered!\n");
+  ErrorHandler = handler;
+  ErrorHandlerUserData = user_data;
+}
+
+void llvm::remove_fatal_error_handler() {
+  ErrorHandler = 0;
+}
+
+void llvm::report_fatal_error(const char *Reason, bool GenCrashDiag) {
+  report_fatal_error(Twine(Reason), GenCrashDiag);
+}
+
+void llvm::report_fatal_error(const std::string &Reason, bool GenCrashDiag) {
+  report_fatal_error(Twine(Reason), GenCrashDiag);
+}
+
+void llvm::report_fatal_error(StringRef Reason, bool GenCrashDiag) {
+  report_fatal_error(Twine(Reason), GenCrashDiag);
+}
+
+void llvm::report_fatal_error(const Twine &Reason, bool GenCrashDiag) {
+  if (ErrorHandler) {
+    ErrorHandler(ErrorHandlerUserData, Reason.str(), GenCrashDiag);
+  } else {
+    // Blast the result out to stderr.  We don't try hard to make sure this
+    // succeeds (e.g. handling EINTR) and we can't use errs() here because
+    // raw ostreams can call report_fatal_error.
+    SmallVector<char, 64> Buffer;
+    raw_svector_ostream OS(Buffer);
+    OS << "LLVM ERROR: " << Reason << "\n";
+    StringRef MessageStr = OS.str();
+    ssize_t written = ::write(2, MessageStr.data(), MessageStr.size());
+    (void)written; // If something went wrong, we deliberately just give up.
+  }
+
+  // If we reached here, we are failing ungracefully. Run the interrupt handlers
+  // to make sure any special cleanups get done, in particular that we remove
+  // files registered with RemoveFileOnSignal.
+  sys::RunInterruptHandlers();
+
+  exit(1);
+}
+
+void llvm::llvm_unreachable_internal(const char *msg, const char *file,
+                                     unsigned line) {
+  // This code intentionally doesn't call the ErrorHandler callback, because
+  // llvm_unreachable is intended to be used to indicate "impossible"
+  // situations, and not legitimate runtime errors.
+  if (msg)
+    dbgs() << msg << "\n";
+  dbgs() << "UNREACHABLE executed";
+  if (file)
+    dbgs() << " at " << file << ":" << line;
+  dbgs() << "!\n";
+  abort();
+#ifdef LLVM_BUILTIN_UNREACHABLE
+  // Windows systems and possibly others don't declare abort() to be noreturn,
+  // so use the unreachable builtin to avoid a Clang self-host warning.
+  LLVM_BUILTIN_UNREACHABLE;
+#endif
+}
+
+static void bindingsErrorHandler(void *user_data, const std::string& reason,
+                                 bool gen_crash_diag) {
+  LLVMFatalErrorHandler handler =
+      LLVM_EXTENSION reinterpret_cast<LLVMFatalErrorHandler>(user_data);
+  handler(reason.c_str());
+}
+
+void LLVMInstallFatalErrorHandler(LLVMFatalErrorHandler Handler) {
+  install_fatal_error_handler(bindingsErrorHandler,
+                              LLVM_EXTENSION reinterpret_cast<void *>(Handler));
+}
+
+void LLVMResetFatalErrorHandler() {
+  remove_fatal_error_handler();
+}