// Copyright 2005, Google Inc.

// All rights reserved.

//

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// modification, are permitted provided that the following conditions are

// met:

//

//     * Redistributions of source code must retain the above copyright

// notice, this list of conditions and the following disclaimer.

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// copyright notice, this list of conditions and the following disclaimer

// in the documentation and/or other materials provided with the

// distribution.

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// contributors may be used to endorse or promote products derived from

// this software without specific prior written permission.

//

// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

//

// Authors: wan@google.com (Zhanyong Wan), eefacm@gmail.com (Sean Mcafee)

//

// The Google C++ Testing Framework (Google Test)

//

// This header file defines internal utilities needed for implementing

// death tests.  They are subject to change without notice.

#ifndef GTEST_INCLUDE_GTEST_INTERNAL_GTEST_DEATH_TEST_INTERNAL_H_

#define GTEST_INCLUDE_GTEST_INTERNAL_GTEST_DEATH_TEST_INTERNAL_H_

#include "gtest/internal/gtest-internal.h"

#include <stdio.h>

namespace testing {

namespace internal {

GTEST_DECLARE_string_(internal_run_death_test);

// Names of the flags (needed for parsing Google Test flags).

const char kDeathTestStyleFlag[] = "death_test_style";

const char kDeathTestUseFork[] = "death_test_use_fork";

const char kInternalRunDeathTestFlag[] = "internal_run_death_test";

#if GTEST_HAS_DEATH_TEST

// DeathTest is a class that hides much of the complexity of the

// GTEST_DEATH_TEST_ macro.  It is abstract; its static Create method

// returns a concrete class that depends on the prevailing death test

// style, as defined by the --gtest_death_test_style and/or

// --gtest_internal_run_death_test flags.

// In describing the results of death tests, these terms are used with

// the corresponding definitions:

//

// exit status:  The integer exit information in the format specified

//               by wait(2)

// exit code:    The integer code passed to exit(3), _exit(2), or

//               returned from main()

class GTEST_API_ DeathTest {

 public:

  // Create returns false if there was an error determining the

  // appropriate action to take for the current death test; for example,

  // if the gtest_death_test_style flag is set to an invalid value.

  // The LastMessage method will return a more detailed message in that

  // case.  Otherwise, the DeathTest pointer pointed to by the "test"

  // argument is set.  If the death test should be skipped, the pointer

  // is set to NULL; otherwise, it is set to the address of a new concrete

  // DeathTest object that controls the execution of the current test.

  static bool Create(const char* statement, const RE* regex,

                     const char* file, int line, DeathTest** test);

  DeathTest();

  virtual ~DeathTest() { }

  // A helper class that aborts a death test when it's deleted.

  class ReturnSentinel {

   public:

    explicit ReturnSentinel(DeathTest* test) : test_(test) { }

    ~ReturnSentinel() { test_->Abort(TEST_ENCOUNTERED_RETURN_STATEMENT); }

   private:

    DeathTest* const test_;

    GTEST_DISALLOW_COPY_AND_ASSIGN_(ReturnSentinel);

  } GTEST_ATTRIBUTE_UNUSED_;

  // An enumeration of possible roles that may be taken when a death

  // test is encountered.  EXECUTE means that the death test logic should

  // be executed immediately.  OVERSEE means that the program should prepare

  // the appropriate environment for a child process to execute the death

  // test, then wait for it to complete.

  enum TestRole { OVERSEE_TEST, EXECUTE_TEST };

  // An enumeration of the three reasons that a test might be aborted.

  enum AbortReason {

    TEST_ENCOUNTERED_RETURN_STATEMENT,

    TEST_THREW_EXCEPTION,

    TEST_DID_NOT_DIE

  };

  // Assumes one of the above roles.

  virtual TestRole AssumeRole() = 0;

  // Waits for the death test to finish and returns its status.

  virtual int Wait() = 0;

  // Returns true if the death test passed; that is, the test process

  // exited during the test, its exit status matches a user-supplied

  // predicate, and its stderr output matches a user-supplied regular

  // expression.

  // The user-supplied predicate may be a macro expression rather

  // than a function pointer or functor, or else Wait and Passed could

  // be combined.

  virtual bool Passed(bool exit_status_ok) = 0;

  // Signals that the death test did not die as expected.

  virtual void Abort(AbortReason reason) = 0;

  // Returns a human-readable outcome message regarding the outcome of

  // the last death test.

  static const char* LastMessage();

  static void set_last_death_test_message(const std::string& message);

 private:

  // A string containing a description of the outcome of the last death test.

  static std::string last_death_test_message_;

  GTEST_DISALLOW_COPY_AND_ASSIGN_(DeathTest);

};

// Factory interface for death tests.  May be mocked out for testing.

class DeathTestFactory {

 public:

  virtual ~DeathTestFactory() { }

  virtual bool Create(const char* statement, const RE* regex,

                      const char* file, int line, DeathTest** test) = 0;

};

// A concrete DeathTestFactory implementation for normal use.

class DefaultDeathTestFactory : public DeathTestFactory {

 public:

  virtual bool Create(const char* statement, const RE* regex,

                      const char* file, int line, DeathTest** test);

};

// Returns true if exit_status describes a process that was terminated

// by a signal, or exited normally with a nonzero exit code.

GTEST_API_ bool ExitedUnsuccessfully(int exit_status);

// Traps C++ exceptions escaping statement and reports them as test

// failures. Note that trapping SEH exceptions is not implemented here.

# if GTEST_HAS_EXCEPTIONS

#  define GTEST_EXECUTE_DEATH_TEST_STATEMENT_(statement, death_test) \

  try { \

    GTEST_SUPPRESS_UNREACHABLE_CODE_WARNING_BELOW_(statement); \

  } catch (const ::std::exception& gtest_exception) { \

    fprintf(\

        stderr, \

        "\n%s: Caught std::exception-derived exception escaping the " \

        "death test statement. Exception message: %s\n", \

        ::testing::internal::FormatFileLocation(__FILE__, __LINE__).c_str(), \

        gtest_exception.what()); \

    fflush(stderr); \

    death_test->Abort(::testing::internal::DeathTest::TEST_THREW_EXCEPTION); \

  } catch (...) { \

    death_test->Abort(::testing::internal::DeathTest::TEST_THREW_EXCEPTION); \

  }

# else

#  define GTEST_EXECUTE_DEATH_TEST_STATEMENT_(statement, death_test) \

  GTEST_SUPPRESS_UNREACHABLE_CODE_WARNING_BELOW_(statement)

# endif

// This macro is for implementing ASSERT_DEATH*, EXPECT_DEATH*,

// ASSERT_EXIT*, and EXPECT_EXIT*.

# define GTEST_DEATH_TEST_(statement, predicate, regex, fail) \

  GTEST_AMBIGUOUS_ELSE_BLOCKER_ \

  if (::testing::internal::AlwaysTrue()) { \

    const ::testing::internal::RE& gtest_regex = (regex); \

    ::testing::internal::DeathTest* gtest_dt; \

    if (!::testing::internal::DeathTest::Create(#statement, &gtest_regex, \

        __FILE__, __LINE__, &gtest_dt)) { \

      goto GTEST_CONCAT_TOKEN_(gtest_label_, __LINE__); \

    } \

    if (gtest_dt != NULL) { \

      ::testing::internal::scoped_ptr< ::testing::internal::DeathTest> \

          gtest_dt_ptr(gtest_dt); \

      switch (gtest_dt->AssumeRole()) { \

        case ::testing::internal::DeathTest::OVERSEE_TEST: \

          if (!gtest_dt->Passed(predicate(gtest_dt->Wait()))) { \

            goto GTEST_CONCAT_TOKEN_(gtest_label_, __LINE__); \

          } \

          break; \

        case ::testing::internal::DeathTest::EXECUTE_TEST: { \

          ::testing::internal::DeathTest::ReturnSentinel \

              gtest_sentinel(gtest_dt); \

          GTEST_EXECUTE_DEATH_TEST_STATEMENT_(statement, gtest_dt); \

          gtest_dt->Abort(::testing::internal::DeathTest::TEST_DID_NOT_DIE); \

          break; \

        } \

        default: \

          break; \

      } \

    } \

  } else \

    GTEST_CONCAT_TOKEN_(gtest_label_, __LINE__): \

      fail(::testing::internal::DeathTest::LastMessage())

// The symbol "fail" here expands to something into which a message

// can be streamed.

// This macro is for implementing ASSERT/EXPECT_DEBUG_DEATH when compiled in

// NDEBUG mode. In this case we need the statements to be executed, the regex is

// ignored, and the macro must accept a streamed message even though the message

// is never printed.

# define GTEST_EXECUTE_STATEMENT_(statement, regex) \

  GTEST_AMBIGUOUS_ELSE_BLOCKER_ \

  if (::testing::internal::AlwaysTrue()) { \

     GTEST_SUPPRESS_UNREACHABLE_CODE_WARNING_BELOW_(statement); \

  } else \

    ::testing::Message()

// A class representing the parsed contents of the

// --gtest_internal_run_death_test flag, as it existed when

// RUN_ALL_TESTS was called.

class InternalRunDeathTestFlag {

 public:

  InternalRunDeathTestFlag(const std::string& a_file,

                           int a_line,

                           int an_index,

                           int a_write_fd)

      : file_(a_file), line_(a_line), index_(an_index),

        write_fd_(a_write_fd) {}

  ~InternalRunDeathTestFlag() {

    if (write_fd_ >= 0)

      posix::Close(write_fd_);

  }

  const std::string& file() const { return file_; }

  int line() const { return line_; }

  int index() const { return index_; }

  int write_fd() const { return write_fd_; }

 private:

  std::string file_;

  int line_;

  int index_;

  int write_fd_;

  GTEST_DISALLOW_COPY_AND_ASSIGN_(InternalRunDeathTestFlag);

};

// Returns a newly created InternalRunDeathTestFlag object with fields

// initialized from the GTEST_FLAG(internal_run_death_test) flag if

// the flag is specified; otherwise returns NULL.

InternalRunDeathTestFlag* ParseInternalRunDeathTestFlag();

#else  // GTEST_HAS_DEATH_TEST

// This macro is used for implementing macros such as

// EXPECT_DEATH_IF_SUPPORTED and ASSERT_DEATH_IF_SUPPORTED on systems where

// death tests are not supported. Those macros must compile on such systems

// iff EXPECT_DEATH and ASSERT_DEATH compile with the same parameters on

// systems that support death tests. This allows one to write such a macro

// on a system that does not support death tests and be sure that it will

// compile on a death-test supporting system.

//

// Parameters:

//   statement -  A statement that a macro such as EXPECT_DEATH would test

//                for program termination. This macro has to make sure this

//                statement is compiled but not executed, to ensure that

//                EXPECT_DEATH_IF_SUPPORTED compiles with a certain

//                parameter iff EXPECT_DEATH compiles with it.

//   regex     -  A regex that a macro such as EXPECT_DEATH would use to test

//                the output of statement.  This parameter has to be

//                compiled but not evaluated by this macro, to ensure that

//                this macro only accepts expressions that a macro such as

//                EXPECT_DEATH would accept.

//   terminator - Must be an empty statement for EXPECT_DEATH_IF_SUPPORTED

//                and a return statement for ASSERT_DEATH_IF_SUPPORTED.

//                This ensures that ASSERT_DEATH_IF_SUPPORTED will not

//                compile inside functions where ASSERT_DEATH doesn't

//                compile.

//

//  The branch that has an always false condition is used to ensure that

//  statement and regex are compiled (and thus syntactically correct) but

//  never executed. The unreachable code macro protects the terminator

//  statement from generating an 'unreachable code' warning in case

//  statement unconditionally returns or throws. The Message constructor at

//  the end allows the syntax of streaming additional messages into the

//  macro, for compilational compatibility with EXPECT_DEATH/ASSERT_DEATH.

# define GTEST_UNSUPPORTED_DEATH_TEST_(statement, regex, terminator) \

    GTEST_AMBIGUOUS_ELSE_BLOCKER_ \

    if (::testing::internal::AlwaysTrue()) { \

      GTEST_LOG_(WARNING) \

          << "Death tests are not supported on this platform.\n" \

          << "Statement '" #statement "' cannot be verified."; \

    } else if (::testing::internal::AlwaysFalse()) { \

      ::testing::internal::RE::PartialMatch(".*", (regex)); \

      GTEST_SUPPRESS_UNREACHABLE_CODE_WARNING_BELOW_(statement); \

      terminator; \

    } else \

      ::testing::Message()

#endif  // GTEST_HAS_DEATH_TEST

}  // namespace internal

}  // namespace testing

#endif  // GTEST_INCLUDE_GTEST_INTERNAL_GTEST_DEATH_TEST_INTERNAL_H_