source: vbox/trunk/include/VBox/com/assert.h@ 4693

/** @file
 * MS COM / XPCOM Abstraction Layer:
 * Assertion macros for COM/XPCOM
 */

/*
 * Copyright (C) 2006-2007 innotek GmbH
 *
 * This file is part of VirtualBox Open Source Edition (OSE), as
 * available from http://www.virtualbox.org. This file is free software;
 * you can redistribute it and/or modify it under the terms of the GNU
 * General Public License as published by the Free Software Foundation,
 * in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
 * distribution. VirtualBox OSE is distributed in the hope that it will
 * be useful, but WITHOUT ANY WARRANTY of any kind.
 */

#ifndef ___VBox_com_assert_h
#define ___VBox_com_assert_h

#include <iprt/assert.h>

/**
 *  Asserts that the COM result code is succeeded in strict builds.
 *  In non-strict builds the result code will be NOREF'ed to kill compiler warnings.
 *
 *  @param rc   COM result code
 */
#define AssertComRC(rc)      \
    do { AssertMsg (SUCCEEDED (rc), ("COM RC = 0x%08X\n", rc)); NOREF (rc); } while (0)

/**
 *  A special version of AssertComRC that returns the given expression
 *  if the result code is failed.
 *
 *  @param rc   COM result code
 *  @param ret  the expression to return
 */
#define AssertComRCReturn(rc, ret)      \
    AssertMsgReturn (SUCCEEDED (rc), ("COM RC = 0x%08X\n", rc), ret)

/**
 *  A special version of AssertComRC that returns the given result code
 *  if it is failed.
 *
 *  @param rc   COM result code
 *  @param ret  the expression to return
 */
#define AssertComRCReturnRC(rc)         \
    AssertMsgReturn (SUCCEEDED (rc), ("COM RC = 0x%08X\n", rc), rc)

/**
 *  A special version of AssertComRC that returns if the result code is failed.
 *
 *  @param rc   COM result code
 *  @param ret  the expression to return
 */
#define AssertComRCReturnVoid(rc)      \
    AssertMsgReturnVoid (SUCCEEDED (rc), ("COM RC = 0x%08X\n", rc))

/**
 *  A special version of AssertComRC that evaluates the given expression and
 *  breaks if the result code is failed.
 *
 *  @param rc   COM result code
 *  @param eval the expression to evaluate
 */
#define AssertComRCBreak(rc, eval)      \
    if (1) { AssertComRC (rc); if (!SUCCEEDED (rc)) { eval; break; } } else do {} while (0)

/**
 *  A special version of AssertComRC that just breaks if the result code is
 *  failed.
 *
 *  @param rc   COM result code
 */
#define AssertComRCBreakRC(rc)          \
    if (1) { AssertComRC (rc); if (!SUCCEEDED (rc)) { break; } } else do {} while (0)

/**
 *  Checks whether the given COM result code is successful.
 *  If not, executes the return statement with this result code.
 *
 *  @param rc   COM result code
 */
#define CheckComRCReturnRC(rc)      \
    if (1) { if (!SUCCEEDED (rc)) return (rc); } else do {} while (0)

/**
 *  Checks whether the given COM result code is successful.
 *  If not, executes the break statement.
 *
 *  @param rc   COM result code
 */
#define CheckComRCBreakRC(rc)      \
    if (1) { if (!SUCCEEDED (rc)) { break; } } else do {} while (0)

/*
 * A section of helpful macros for error output
 */

/**
 *  Prints a line describing the given COM result code.
 *  Used by command line tools or for debugging.
 */
#define PRINT_RC_MESSAGE(rc) \
    RTPrintf ("[!] Primary RC  = %Rwa\n", rc)

/**
 *  Prints the extended error information.
 *  Used by command line tools or for debugging.
 *
 *  @param info com::ErrorInfo instance
 */
#define PRINT_ERROR_INFO(info) \
    do { \
        info.print ("[!] "); \
    } while (0)

/**
 *  Calls the given interface method and then checks if the return value
 *  (COM result code) indicates a failure. If so, prints the failed
 *  function/line/file and the description of the result code.
 *
 *  Used by command line tools or for debugging and assumes the |HRESULT rc|
 *  variable is accessible for assigning in the current scope.
 */
#define CHECK_RC(method) \
    do { \
        rc = method; \
        if (FAILED (rc)) { \
            RTPrintf("[!] FAILED calling " #method " at line %d!\n", __LINE__); \
            PRINT_RC_MESSAGE(rc); \
        } \
    } while (0)

/**
 *  Does the same as CHECK_RC(), but executes the |return rc| statement on
 *  failure.
 */
#define CHECK_RC_RET(method) \
    do { CHECK_RC (method); if (FAILED (rc)) return rc; } while (0)

/**
 *  Does the same as CHECK_RC(), but executes the |break| statement on
 *  failure.
 */
#define CHECK_RC_BREAK(method) \
    if (1) { CHECK_RC (method); if (FAILED (rc)) break; } else do {} while (0)

/**
 *  Calls the given method of the given interface and then checks if the return
 *  value (COM result code) indicates a failure. If so, prints the failed
 *  function/line/file, the description of the result code and attempts to
 *  query the extended error information on the current thread (using
 *  com::ErrorInfo) if the interface reports that it supports error information.
 *
 *  Used by command line tools or for debugging and assumes the |HRESULT rc|
 *  variable is accessible for assigning in the current scope.
 */
#define CHECK_ERROR(iface, method) \
    do \
    { \
        CHECK_RC(iface->method); \
        if (FAILED(rc)) { \
            com::ErrorInfo info (iface); \
            info.print ("[!] "); \
        } \
    } while (0)

/**
 *  Does the same as CHECK_ERROR(), but executes the |return ret| statement on
 *  failure.
 */
#define CHECK_ERROR_RET(iface, method, ret) \
    do { CHECK_ERROR (iface, method); if (FAILED (rc)) return (ret); } while (0)

/**
 *  Does the same as CHECK_ERROR(), but executes the |break| statement on
 *  failure.
 */
#define CHECK_ERROR_BREAK(iface, method) \
    if (1) { CHECK_ERROR (iface, method); if (FAILED (rc)) break; } else do {} while (0)

#define CHECK_ERROR_NOCALL() \
    do { \
        com::ErrorInfo info; \
        PRINT_ERROR_INFO (info); \
    } while (0)

/**
 *  Does the same as CHECK_ERROR(), but doesn't need the interface pointer
 *  because doesn't do a check whether the interface supports error info or not.
 */
#define CHECK_ERROR_NI(method) \
    do { \
        CHECK_RC (method); \
        if (FAILED (rc)) { \
            com::ErrorInfo info; \
            PRINT_ERROR_INFO (info); \
        } \
    } while (0)

/**
 *  Does the same as CHECK_ERROR_NI(), but executes the |return rc| statement
 *  on failure.
 */
#define CHECK_ERROR_NI_RET(method) \
    do { CHECK_ERROR_NI (method); if (FAILED (rc)) return rc; } while (0)

/**
 *  Does the same as CHECK_ERROR_NI(), but executes the |break| statement
 *  on failure.
 */
#define CHECK_ERROR_NI_BREAK(method) \
    if (1) { CHECK_ERROR_NI (method); if (FAILED (rc)) break; } else do {} while (0)


/**
 *  Asserts the given expression is true. When the expression is false, prints
 *  a line containing the failied function/line/file; otherwise does nothing.
 */
#define ASSERT(expr) \
    do { \
        if (!(expr)) \
            RTPrintf("[!] ASSERTION FAILED at line %d: %s\n", __LINE__, #expr); \
    } while (0)

/**
 *  Does the same as ASSERT(), but executes the |return ret| statement if the
 *  expression to assert is false.
 */
#define ASSERT_RET(expr, ret) \
    do { ASSERT (expr); if (!(expr)) return (ret); } while (0)

/**
 *  Does the same as ASSERT(), but executes the |break| statement if the
 *  expression to assert is false.
 */
#define ASSERT_BREAK(expr) \
    if (1) { ASSERT (expr); if (!(expr)) break; } else do {} while (0)


#endif