cyg_ass.h

基于ecos的redboot

#ifndef CYGONCE_INFRA_CYG_ASS_H
#define CYGONCE_INFRA_CYG_ASS_H

//==========================================================================
//
//      assert.h
//
//      Macros and prototypes for the assert system
//
//==========================================================================
//####COPYRIGHTBEGIN####
//                                                                          
// -------------------------------------------                              
// The contents of this file are subject to the Red Hat eCos Public License 
// Version 1.1 (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.redhat.com/                                                   
//                                                                          
// Software distributed under the License is distributed on an "AS IS"      
// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See the 
// License for the specific language governing rights and limitations under 
// the License.                                                             
//                                                                          
// The Original Code is eCos - Embedded Configurable Operating System,      
// released September 30, 1998.                                             
//                                                                          
// The Initial Developer of the Original Code is Red Hat.                   
// Portions created by Red Hat are                                          
// Copyright (C) 1998, 1999, 2000 Red Hat, Inc.                             
// All Rights Reserved.                                                     
// -------------------------------------------                              
//                                                                          
//####COPYRIGHTEND####
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):   nickg from an original by hmt
// Contributors:        nickg
// Date:        1997-09-08
// Purpose:     Use asserts to avoid writing duff code.
// Description: Runtime tests that compile to nothing in
//              release versions of the code, to allow
//              as-you-go testing of alternate builds.
// Usage:       #include <cyg/infra/cyg_ass.h>
//              ...
//              CYG_ASSERT( pcount > 0, "Number of probes should be > 0!" );
//
//      which can result, for example, in a message of the form:
//      ASSERT FAILED: probemgr.cxx:1340, scan_probes() :
//                     number of probes should be > 0!
//      if the boolean "pcount > 0" is false.
//
//####DESCRIPTIONEND####
//
//==========================================================================

#include <pkgconf/infra.h>

#include <cyg/infra/cyg_type.h>         // for CYGBLD_ATTRIB_NORET

// -------------------------------------------------------------------------
// If we do not have a function name macro, define it ourselves

#ifndef CYGDBG_INFRA_DEBUG_FUNCTION_PSEUDOMACRO
                                        // __PRETTY_FUNCTION__ does not work
# ifndef __PRETTY_FUNCTION__            // And it is not already defined
#  define __PRETTY_FUNCTION__ NULL
# endif
#endif

// -------------------------------------------------------------------------
// This is executed to deal with failure - breakpoint it first!
// It is declared as a weak symbol to allow user code to override the
// definition.

externC void
cyg_assert_fail( const char* /* psz_func */, const char* /* psz_file */,
                 cyg_uint32 /* linenum */, const char* /* psz_msg */ )
    CYGBLD_ATTRIB_NORET CYGBLD_ATTRIB_WEAK;


// -------------------------------------------------------------------------

#ifdef CYGDBG_USE_ASSERTS

// -------------------------------------------------------------------------
// We define macros and appropriate prototypes for the assert/fail
// system.  These are:
//      CYG_FAIL        - unconditional panic
//      CYG_ASSERT      - panic if boolean expression is false
//      CYG_ASSERTC     - compact version of CYG_ASSERT

# ifdef CYGDBG_INFRA_DEBUG_ASSERT_MESSAGE
#  define CYG_ASSERT_DOCALL( _msg_ )                                      \
        CYG_MACRO_START                                                   \
        cyg_assert_fail( __PRETTY_FUNCTION__, __FILE__, __LINE__, _msg_ );\
        CYG_MACRO_END
# else
#   define CYG_ASSERT_DOCALL( _msg_ )    \
        CYG_MACRO_START                 \
        const char* _tmp1_ = _msg_;     \
        _tmp1_ = _tmp1_;                \
        cyg_assert_fail( __PRETTY_FUNCTION__, __FILE__, __LINE__, NULL ); \
        CYG_MACRO_END
# endif

// unconditional failure; use like panic(), coredump() &c.
# define CYG_FAIL( _msg_ )              \
        CYG_MACRO_START                 \
        CYG_ASSERT_DOCALL( _msg_ );      \
        CYG_MACRO_END

// conditioned assert; if the condition is false, fail.
# define CYG_ASSERT( _bool_, _msg_ )    \
        CYG_MACRO_START                 \
        if ( ! ( _bool_ ) )             \
            CYG_ASSERT_DOCALL( _msg_ );  \
        CYG_MACRO_END

# define CYG_ASSERTC( _bool_ )          \
       CYG_MACRO_START                  \
       if ( ! ( _bool_ ) )              \
           CYG_ASSERT_DOCALL( #_bool_ );\
       CYG_MACRO_END

#else // ! CYGDBG_USE_ASSERTS

// -------------------------------------------------------------------------
// No asserts: we define empty statements for assert & fail.

# define CYG_FAIL( _msg_ )           CYG_EMPTY_STATEMENT
# define CYG_ASSERT( _bool_, _msg_ ) CYG_EMPTY_STATEMENT
# define CYG_ASSERTC( _bool_ )       CYG_EMPTY_STATEMENT

#endif // ! CYGDBG_USE_ASSERTS

// -------------------------------------------------------------------------
// Pointer integrity checks.
// These check not only for NULL pointer, but can also check for pointers
// that are outside to defined memory areas of the platform or executable.
// We differentiate between data and function pointers, so that we can cope
// with different formats, and so we can check them against different memory
// regions.

externC cyg_bool cyg_check_data_ptr(void *ptr);
externC cyg_bool cyg_check_func_ptr(void (*ptr)(void));

#ifdef CYGDBG_USE_ASSERTS

# define CYG_CHECK_DATA_PTR( _ptr_, _msg_ )             \
        CYG_MACRO_START                                 \
        if( !cyg_check_data_ptr((void *)(_ptr_)))       \
           CYG_ASSERT_DOCALL( _msg_ );                   \
        CYG_MACRO_END

# define CYG_CHECK_FUNC_PTR( _ptr_, _msg_ )             \
        CYG_MACRO_START                                 \
        if( !cyg_check_func_ptr((void (*)(void))(_ptr_))) \
           CYG_ASSERT_DOCALL( _msg_ );                   \
        CYG_MACRO_END
        
# define CYG_CHECK_DATA_PTRC( _ptr_ )                   \
         CYG_MACRO_START                                \
         if ( !cyg_check_data_ptr((void *)(_ptr_)))     \
             CYG_ASSERT_DOCALL("data pointer (" #_ptr_ ") is valid");\
         CYG_MACRO_END

# define CYG_CHECK_FUNC_PTRC( _ptr_ )                       \
         CYG_MACRO_START                                    \
         if ( !cyg_check_func_ptr((void (*)(void))(_ptr_))) \
             CYG_ASSERT_DOCALL("function pointer (" #_ptr_ ") is valid"); \
         CYG_MACRO_END

#else // CYGDBG_USE_ASSERTS

# define CYG_CHECK_DATA_PTR( _ptr_, _msg_ ) CYG_EMPTY_STATEMENT
# define CYG_CHECK_FUNC_PTR( _ptr_, _msg_ ) CYG_EMPTY_STATEMENT
# define CYG_CHECK_DATA_PTRC( _ptr_ )       CYG_EMPTY_STATEMENT
# define CYG_CHECK_FUNC_PTRC( _ptr_ )       CYG_EMPTY_STATEMENT

#endif // CYGDBG_USE_ASSERTS
            
// -------------------------------------------------------------------------
// Unconditional definitions:

// Check an object for validity by calling its own checker.
// Usage:
//   ClassThing *p = &classobject;
//   CYG_ASSERTCLASS( p, "Object at p is broken!" );

// this enum gives some options as to how keenly to test; avoids cluttering
// the member function declaration if the implementor wants to do more
// zealous tests themselves.

enum cyg_assert_class_zeal {
  cyg_system_test       = -1,
  cyg_none              = 0,
  cyg_trivial,
  cyg_quick,
  cyg_thorough,
  cyg_extreme
};

// -------------------------------------------------------------------------
// Define macros for checking classes:
//
//      CYG_ASSERT_CLASS        - do proforma check on a class pointer
//      CYG_ASSERT_CLASSO       - do proforma check on a class object
//      CYG_ASSERT_ZERO_OR_CLASS- a class pointer is NULL or valid
//      CYG_ASSERT_THIS         - "this" is valid
//      + 3 compact variants and two aliases for backwards compatibility.
//
// All of these end up going via CYG_ASSERT(), which will be an empty
// statement if CYGDBG_USE_ASSERTS is disabled. There is no need to
// test CYGDBG_USE_ASSERTS again here.
//
// The idiom required is that a class have a member function called
// "bool check_this( cyg_assert_class_zeal ) const" that returns true
// iff the object is OK.  This need not be conditionally compiled against
// CYGDBG_USE_ASSERTS but it can be if only this macro is used to
// invoke it.  Alternatively it can be invoked by hand with other
// choices from the above enum.

// Assert the checker function of an object by pointer, or in hand.

#ifdef __cplusplus

# ifndef CYG_ASSERT_CLASS_ZEAL
#  define CYG_ASSERT_CLASS_ZEAL (cyg_quick) // can be redefined locally
# endif

# define CYG_ASSERT_CLASS( _pobj_, _msg_ ) \
    CYG_ASSERT( ((0 != (_pobj_)) &&        \
                 (_pobj_)->check_this( CYG_ASSERT_CLASS_ZEAL )), _msg_ )

# define CYG_ASSERTCLASS( _pobj_,_msg_) \
    CYG_ASSERT_CLASS( (_pobj_), _msg_ )

# define CYG_ASSERT_CLASSO( _obj_, _msg_ ) \
    CYG_ASSERT( (_obj_).check_this( CYG_ASSERT_CLASS_ZEAL ), _msg_ )

# define CYG_ASSERTCLASSO( _obj_, _msg_ ) \
    CYG_ASSERT_CLASSO( (_obj_), _msg_ )

# define CYG_ASSERT_ZERO_OR_CLASS( _pobj_, _msg_ ) \
    CYG_ASSERT( ((0 == (_pobj_)) ||                \
                 (_pobj_)->check_this( CYG_ASSERT_CLASS_ZEAL )), _msg_ )

# define CYG_ASSERT_THIS( _msg_ ) \
    CYG_ASSERT( this->check_this( CYG_ASSERT_CLASS_ZEAL ), _msg_ )

# define CYG_ASSERT_CLASSC( _pobj_ ) \
    CYG_ASSERT_CLASS( (_pobj_), "class pointer (" #_pobj_ ") is valid" )

# define CYG_ASSERT_CLASSOC( _obj_ ) \
    CYG_ASSERT_CLASSO( (_obj_), "object (" #_obj_ ") is valid" )

# define CYG_ASSERT_ZERO_OR_CLASSC( _pobj_ ) \
    CYG_ASSERT_ZERO_OR_CLASS((_pobj_),       \
        "class pointer (" #_pobj_ ") is zero or valid")

# define CYG_ASSERT_THISC( ) \
    CYG_ASSERT_THIS( "\"this\" pointer is valid" )
    
#define CYGDBG_DEFINE_CHECK_THIS \
    cyg_bool check_this( cyg_assert_class_zeal zeal ) const;

#endif // __cplusplus

// -------------------------------------------------------------------------
// Some alternative names for basic assertions that we can disable
// individually.
//
//      CYG_PRECONDITION        - argument checking etc
//      CYG_POSTCONDITION       - results etc
//      CYG_LOOP_INVARIANT      - for putting in loops
//
// C++ programmers have class-related variants of all of these.

#ifdef CYGDBG_INFRA_DEBUG_PRECONDITIONS
# define CYG_PRECONDITION( _bool_ , _msg_ ) CYG_ASSERT( _bool_, _msg_ )
# define CYG_PRECONDITIONC( _bool_ ) \
    CYG_ASSERT( _bool_, "precondition " #_bool_)
#else
# define CYG_PRECONDITION( _bool_ , _msg_ ) CYG_EMPTY_STATEMENT
# define CYG_PRECONDITIONC( _bool_ )        CYG_EMPTY_STATEMENT
#endif

#ifdef CYGDBG_INFRA_DEBUG_POSTCONDITIONS
# define CYG_POSTCONDITION( _bool_ , _msg_ ) CYG_ASSERT( _bool_, _msg_ )
# define CYG_POSTCONDITIONC( _bool_ ) \
    CYG_ASSERT( _bool_, "postcondition " #_bool_)
#else
# define CYG_POSTCONDITION( _bool_ , _msg_ ) CYG_EMPTY_STATEMENT
# define CYG_POSTCONDITIONC( _bool_ )        CYG_EMPTY_STATEMENT
#endif

#ifdef CYGDBG_INFRA_DEBUG_LOOP_INVARIANTS
# define CYG_LOOP_INVARIANT( _bool_ , _msg_ ) CYG_ASSERT( _bool_, _msg_ )
# define CYG_LOOP_INVARIANTC( _bool_ ) \
    CYG_ASSERT( _bool_, "loop invariant " #_bool_ )
#else