Add TaskMemory, which can read another Mach task’s memory, and its test

util/test/mac/mach_errors.h

Index: util/test/mac/mach_errors.h
diff --git a/util/test/mac/mach_errors.h b/util/test/mac/mach_errors.h
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+// Copyright 2014 The Crashpad Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef CRASHPAD_UTIL_TEST_MAC_MACH_ERRORS_H_
+#define CRASHPAD_UTIL_TEST_MAC_MACH_ERRORS_H_
+
+#include <mach/mach.h>
+
+#include <string>
+
+namespace crashpad {
+namespace test {
+
+// These functions format messages in a similar way to the logging macros in
+// base/mac/mach_logging.h. They exist to interoperate with gtest assertions,
+// which don’t interoperate with logging but can be streamed to.
+//
+// Where non-test code could do:
+//   MACH_CHECK(kr == KERN_SUCCESS, kr) << "vm_deallocate";
+// gtest-based test code can do:
+//   EXPECT_EQ(KERN_SUCCESS, kr) << MachErrorMessage(kr, "vm_deallocate");
+
+//! \brief Formats a Mach error message.
+//!
+//! The returned string will combine the \a base string, if supplied, with a
+//! a textual and numeric description of the error.
+//!
+//! \param[in] mach_err The Mach error code , which may be a `kern_return_t` or

[Robert Sesek, 2014/08/03 14:56:43]

nit: extra space before ,

+//!     related type.
+//! \param[in] base A string to prepend to the error description.
+//!
+//! \return A string of the format `"(os/kern) invalid address (1)"` if \a
+//!     mach_err has the value `KERN_INVALID_ADDRESS` on a system where this is
+//!     defined to be 1. If \a base is not empty, it will be prepended to this
+//!     string, separated by a colon.
+std::string MachErrorMessage(mach_error_t mach_err,
+                             const std::string& base = std::string());
+
+//! \brief Formats a bootstrap error message.
+//!
+//! The returned string will combine the \a base string, if supplied, with a
+//! a textual and numeric description of the error.
+//!
+//! \param[in] bootstrap_err The bootstrap error code.
+//! \param[in] base A string to prepend to the error description.
+//!
+//! \return A string of the format `"Permission denied (1100)"` if \a
+//!     bootstrap_err has the value `BOOTSTRAP_NOT_PRIVILEGED` on a system where
+//!     this is defined to be 1100. If \a base is not empty, it will be
+//!     prepended to this string, separated by a colon. If \a bootstrap_err is
+//!     not a valid bootstrap error code, it will be interpreted as a Mach error
+//!     code in the manner of MachErrorMessage().
+std::string BootstrapErrorMessage(kern_return_t bootstrap_err,
+                                  const std::string& base = std::string());
+
+}  // namespace test
+}  // namespace crashpad
+
+#endif  // CRASHPAD_UTIL_TEST_MAC_MACH_ERRORS_H_