Update LLVM from stable upstream (#1653)

Replace CheckedMalloc with upstream safe_malloc.

wpiutil/src/main/native/include/wpi/ErrorHandling.h

@@ -0,0 +1,144 @@
+//===- llvm/Support/ErrorHandling.h - Fatal error handling ------*- C++ -*-===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef WPIUTIL_WPI_ERRORHANDLING_H
+#define WPIUTIL_WPI_ERRORHANDLING_H
+
+#include "wpi/Compiler.h"
+#include <string>
+
+namespace wpi {
+class StringRef;
+  class Twine;
+
+  /// An error handler callback.
+  typedef void (*fatal_error_handler_t)(void *user_data,
+                                        const std::string& reason,
+                                        bool gen_crash_diag);
+
+  /// install_fatal_error_handler - Installs a new error handler to be used
+  /// whenever a serious (non-recoverable) error is encountered by LLVM.
+  ///
+  /// If no error handler is installed the default is to print the error message
+  /// to stderr, and call exit(1).  If an error handler is installed then it is
+  /// the handler's responsibility to log the message, it will no longer be
+  /// printed to stderr.  If the error handler returns, then exit(1) will be
+  /// called.
+  ///
+  /// It is dangerous to naively use an error handler which throws an exception.
+  /// Even though some applications desire to gracefully recover from arbitrary
+  /// faults, blindly throwing exceptions through unfamiliar code isn't a way to
+  /// achieve this.
+  ///
+  /// \param user_data - An argument which will be passed to the install error
+  /// handler.
+  void install_fatal_error_handler(fatal_error_handler_t handler,
+                                   void *user_data = nullptr);
+
+  /// Restores default error handling behaviour.
+  void remove_fatal_error_handler();
+
+  /// ScopedFatalErrorHandler - This is a simple helper class which just
+  /// calls install_fatal_error_handler in its constructor and
+  /// remove_fatal_error_handler in its destructor.
+  struct ScopedFatalErrorHandler {
+    explicit ScopedFatalErrorHandler(fatal_error_handler_t handler,
+                                     void *user_data = nullptr) {
+      install_fatal_error_handler(handler, user_data);
+    }
+
+    ~ScopedFatalErrorHandler() { remove_fatal_error_handler(); }
+  };
+
+/// Reports a serious error, calling any installed error handler. These
+/// functions are intended to be used for error conditions which are outside
+/// the control of the compiler (I/O errors, invalid user input, etc.)
+///
+/// If no error handler is installed the default is to print the message to
+/// standard error, followed by a newline.
+/// After the error handler is called this function will call exit(1), it
+/// does not return.
+LLVM_ATTRIBUTE_NORETURN void report_fatal_error(const char *reason,
+                                                bool gen_crash_diag = true);
+LLVM_ATTRIBUTE_NORETURN void report_fatal_error(const std::string &reason,
+                                                bool gen_crash_diag = true);
+LLVM_ATTRIBUTE_NORETURN void report_fatal_error(StringRef reason,
+                                                bool gen_crash_diag = true);
+LLVM_ATTRIBUTE_NORETURN void report_fatal_error(const Twine &reason,
+                                                bool gen_crash_diag = true);
+
+/// Installs a new bad alloc error handler that should be used whenever a
+/// bad alloc error, e.g. failing malloc/calloc, is encountered by LLVM.
+///
+/// The user can install a bad alloc handler, in order to define the behavior
+/// in case of failing allocations, e.g. throwing an exception. Note that this
+/// handler must not trigger any additional allocations itself.
+///
+/// If no error handler is installed the default is to print the error message
+/// to stderr, and call exit(1).  If an error handler is installed then it is
+/// the handler's responsibility to log the message, it will no longer be
+/// printed to stderr.  If the error handler returns, then exit(1) will be
+/// called.
+///
+///
+/// \param user_data - An argument which will be passed to the installed error
+/// handler.
+void install_bad_alloc_error_handler(fatal_error_handler_t handler,
+                                     void *user_data = nullptr);
+
+/// Restores default bad alloc error handling behavior.
+void remove_bad_alloc_error_handler();
+
+void install_out_of_memory_new_handler();
+
+/// Reports a bad alloc error, calling any user defined bad alloc
+/// error handler. In contrast to the generic 'report_fatal_error'
+/// functions, this function is expected to return, e.g. the user
+/// defined error handler throws an exception.
+///
+/// Note: When throwing an exception in the bad alloc handler, make sure that
+/// the following unwind succeeds, e.g. do not trigger additional allocations
+/// in the unwind chain.
+///
+/// If no error handler is installed (default), then a bad_alloc exception
+/// is thrown, if LLVM is compiled with exception support, otherwise an
+/// assertion is called.
+void report_bad_alloc_error(const char *Reason, bool GenCrashDiag = true);
+
+/// This function calls abort(), and prints the optional message to stderr.
+/// Use the wpi_unreachable macro (that adds location info), instead of
+/// calling this function directly.
+LLVM_ATTRIBUTE_NORETURN void
+wpi_unreachable_internal(const char *msg = nullptr, const char *file = nullptr,
+                         unsigned line = 0);
+}
+
+/// Marks that the current location is not supposed to be reachable.
+/// In !NDEBUG builds, prints the message and location info to stderr.
+/// In NDEBUG builds, becomes an optimizer hint that the current location
+/// is not supposed to be reachable.  On compilers that don't support
+/// such hints, prints a reduced message instead.
+///
+/// Use this instead of assert(0).  It conveys intent more clearly and
+/// allows compilers to omit some unnecessary code.
+#ifndef NDEBUG
+#define wpi_unreachable(msg) \
+  ::wpi::wpi_unreachable_internal(msg, __FILE__, __LINE__)
+#elif defined(LLVM_BUILTIN_UNREACHABLE)
+#define wpi_unreachable(msg) LLVM_BUILTIN_UNREACHABLE
+#else
+#define wpi_unreachable(msg) ::wpi::wpi_unreachable_internal()
+#endif
+
+#endif