buffer.cxx

eCos操作系统源码

//==========================================================================
//
//      buffer.cxx
//
//      Memory buffered trace and assert functions
//
//==========================================================================
//####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
//
// eCos 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; either version 2 or (at your option) any later version.
//
// eCos is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License along
// with eCos; if not, write to the Free Software Foundation, Inc.,
// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
//
// As a special exception, if other files instantiate templates or use macros
// or inline functions from this file, or you compile this file and link it
// with other works to produce a work based on this file, this file does not
// by itself cause the resulting work to be covered by the GNU General Public
// License. However the source code for this file must still be made available
// in accordance with section (3) of the GNU General Public License.
//
// This exception does not invalidate any other reasons why a work based on
// this file might be covered by the GNU General Public License.
//
// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
// at http://sources.redhat.com/ecos/ecos-license/
// -------------------------------------------
//####ECOSGPLCOPYRIGHTEND####
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):   nickg
// Contributors:        nickg
// Date:        1998-10-16
// Purpose:     Buffered Trace and assert functions
// Description: The functions in this file are a buffered implementation
//              of the standard trace and assert functions. These store
//              trace messages in a memory buffer and emit them when an
//              assert is hit, or when requested to.
//
//####DESCRIPTIONEND####
//
//==========================================================================

#include <pkgconf/system.h>
#include <pkgconf/infra.h>

#ifdef CYGDBG_INFRA_DEBUG_TRACE_ASSERT_BUFFER

#include <cyg/infra/cyg_type.h>         // base types
#include <cyg/infra/cyg_trac.h>         // tracing macros
#include <cyg/infra/cyg_ass.h>          // assertion macros

#include <pkgconf/hal.h>                // HAL configury
#include <cyg/infra/diag.h>             // HAL polled output
#include <cyg/hal/hal_arch.h>           // architectural stuff for...
#include <cyg/hal/hal_intr.h>           // interrupt control

#ifdef CYGPKG_KERNEL
#include <pkgconf/kernel.h>             // kernel configury
#include <cyg/kernel/thread.hxx>        // thread id to print
#include <cyg/kernel/sched.hxx>         // ancillaries for above
#include <cyg/kernel/thread.inl>        // ancillaries for above
#endif

// -------------------------------------------------------------------------
// Local Configuration: hack me!

// these are generally:
//      if 0, feature is disabled
//      if 1, feature is enabled, printing is default width
//      if >1, field is padded up to that width if necessary
//              (not truncated ever)

#define CYG_FILENAME    20
#define CYG_THREADID    1
#define CYG_LINENUM     4
#define CYG_FUNCNAME    100
#define CYG_DIAG_PRINTF 1
#define CYG_FUNC_INDENT 2

#ifndef CYGPKG_KERNEL
# undef  CYG_THREADID
# define CYG_THREADID 0
#endif

#if CYG_FUNCNAME == 1
#define CYG_FBUF_SIZE   100
#else
#define CYG_FBUF_SIZE   (CYG_FUNCNAME+20)
#endif

// -------------------------------------------------------------------------
// Trace buffer

#ifdef CYGDBG_USE_TRACING

struct Cyg_TraceRecord
{
    cyg_uint32          what;
    cyg_uint32          tid;
    const char          *function;
    const char          *file;
    const char          *message;
    cyg_uint32          line;
    cyg_uint32          narg;
    CYG_ADDRWORD        arg[8];
};

Cyg_TraceRecord cyg_infra_trace_buffer[CYGDBG_INFRA_DEBUG_TRACE_BUFFER_SIZE];

static cyg_uint32 cyg_infra_trace_buffer_pos = 0;

static cyg_bool cyg_infra_trace_buffer_enable = true;

static cyg_bool cyg_infra_trace_buffer_wrap = false;

// -------------------------------------------------------------------------
// Functions to trim file names and function names down to printable lengths
// (these are shared between trace and assert functions)

#if 0
static char * tracepremsgs[] = {
    "  INFO:",
    "ENTER :",
    "ARGS  :",
    "RETURN:",
    "bad code"
};
#endif

static char * tracepremsgs[] = {
    "'",
    "{{",
    "((",
    "}}",
    "bad code"
};

static char * tracepostmsgs[] = {
    "'",
    "",
    "))",
    "",
    "bad code"
};

static void
write_whattrace( cyg_uint32 what )
{
#if CYG_FUNC_INDENT
    static cyg_int32 cyg_indent = 0;
    if ( 3 == what )
        cyg_indent -= CYG_FUNC_INDENT;
    cyg_int32 i = cyg_indent;
    for ( ; i > 0; i-- )
        diag_write_string( " " );
#endif // CYG_FUNC_INDENT
    diag_write_string( tracepremsgs[ what > 4 ? 4 : what ] );
#if CYG_FUNC_INDENT
    if ( 1 == what )
        cyg_indent += CYG_FUNC_INDENT;
#endif // CYG_FUNC_INDENT
}

static void
write_whattracepost( cyg_uint32 what )
{
    diag_write_string( tracepostmsgs[ what > 4 ? 4 : what ] );
}


#endif // CYGDBG_USE_TRACING

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

#if defined(CYGDBG_USE_TRACING) || defined(CYGDBG_USE_ASSERTS)

static const char *trim_file(const char *file)
{
#if CYG_FILENAME
    if ( NULL == file )
        file = "<nofile>";

#if 1 == CYG_FILENAME
    const char *f = file;
    while( *f ) f++;
    while( *f != '/' && f != file ) f--;
    return f==file?f:(f+1);
#else
    static char fbuf2[100];
    const char *f = file;
    char *g = fbuf2;
    while( *f ) f++;
    while( *f != '/' && f != file ) f--;
    if ( f > file ) f++;
    while( *f ) *g++ = *f++;
    while( CYG_FILENAME > (g - fbuf2) ) *g++ = ' ';
    *g = 0;
    return fbuf2;
#endif
#else
    return "";
#endif
}

static const char *trim_func(const char *func)
{
#if CYG_FUNCNAME
    static char fbuf[CYG_FBUF_SIZE];
    cyg_count32 i;
    
    if ( NULL == func )
        func = "<nofunc>";

    for( i = 0; func[i] && func[i] != '(' && i < CYG_FBUF_SIZE-4 ; i++ )
        fbuf[i] = func[i];

    fbuf[i++] = '(';
    fbuf[i++] = ')';
    fbuf[i  ] = 0;
    i=0;
#if 1 == CYG_FUNCNAME
    return &fbuf[i];
#else
    char *p = &fbuf[i];
    while ( *p ) p++;
    while ( CYG_FUNCNAME > (p - (&fbuf[i])) ) *p++ = ' ';    
    *p = 0;
    return &fbuf[i];
#endif
#else
    return "";
#endif
}

static void write_lnum( cyg_uint32 lnum)
{
#if CYG_LINENUM
    diag_write_char('[');
#if 1 < CYG_LINENUM
    cyg_uint32 i, j;
    for ( i = 2, j = 100; i < CYG_LINENUM ; i++, j *= 10 )
        if ( lnum < j )
            diag_write_char(' ');
#endif    
    diag_write_dec(lnum);
    diag_write_char(']');
    diag_write_char(' ');
#endif
}

#endif // defined(CYGDBG_USE_TRACING) || defined(CYGDBG_USE_ASSERTS)

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

#if defined(CYGDBG_USE_TRACING) || defined(CYGDBG_USE_ASSERTS)

#if CYG_THREADID
static cyg_uint32 get_tid(void)
{
    
    Cyg_Thread *t = Cyg_Thread::self();
    cyg_uint16 tid = 0xFFFF;

    if( t != NULL ) tid = t->get_unique_id();

    return tid;
}
#else
# define get_tid() (0xFFFF)
#endif

#endif // defined(CYGDBG_USE_TRACING) || defined(CYGDBG_USE_ASSERTS)

#ifdef CYGDBG_USE_ASSERTS
static void write_thread_id()
{
#if CYG_THREADID    
    cyg_uint16 tid = get_tid();

    diag_write_char('<');
    diag_write_hex(tid);
    diag_write_char('>');
#endif
}
#endif

// -------------------------------------------------------------------------
// Trace functions:

#ifdef CYGDBG_USE_TRACING

static void print_trace_buffer(void)
{
    cyg_count32 start = cyg_infra_trace_buffer_pos;
    cyg_count32 end = start;
    cyg_count32 i;

    // If the buffer has wrapped we want to display the records from
    // the current pos and around back to the same place. If the buffer
    // has not wrapped, we want to display from the start to pos.
    
    if( !cyg_infra_trace_buffer_wrap )
        start = 0;

    i = start;
    do
    {
        Cyg_TraceRecord *rec = &cyg_infra_trace_buffer[i];
        cyg_uint32 old_ints;

        const char *psz_msg = rec->message;
        

        HAL_DISABLE_INTERRUPTS(old_ints);
        DIAG_DEVICE_START_SYNC();

        if ( NULL == psz_msg )
            psz_msg = "<nomsg>";

        diag_write_string( "TRACE: " );
#if CYG_THREADID
        diag_write_char('<');
        diag_write_hex(rec->tid);
        diag_write_char('>');
#endif        
        diag_write_string(trim_file(rec->file));
        write_lnum(rec->line);
        diag_write_string(trim_func(rec->function));
        diag_write_char(' ');
        write_whattrace( rec->what );
#if CYG_DIAG_PRINTF
        diag_printf( psz_msg,
                     rec->arg[0], rec->arg[1],
                     rec->arg[2], rec->arg[3],
                     rec->arg[4], rec->arg[5],
                     rec->arg[6], rec->arg[7] );
#else
        diag_write_string(psz_msg);
        diag_write_char(' ');

        for( cyg_count8 j = 0; j < rec->narg ; j++ )
        {
            diag_write_hex(rec->arg[j]);
            diag_write_char(' ');
        }
#endif    
        write_whattracepost( rec->what );
        diag_write_char('\n');    

        DIAG_DEVICE_END_SYNC();
        HAL_RESTORE_INTERRUPTS(old_ints);

        i++;
        if( i == CYGDBG_INFRA_DEBUG_TRACE_BUFFER_SIZE )
            i = 0;
        
    } while( i != end );

}    

static void increment_buffer_pos()
{
    cyg_infra_trace_buffer_pos++;
    
    if( cyg_infra_trace_buffer_pos == CYGDBG_INFRA_DEBUG_TRACE_BUFFER_SIZE )
    {
#if defined(CYGDBG_INFRA_DEBUG_TRACE_BUFFER_WRAP)
        cyg_infra_trace_buffer_pos = 0;
        cyg_infra_trace_buffer_wrap = true;
#elif defined(CYGDBG_INFRA_DEBUG_TRACE_BUFFER_HALT)
        cyg_infra_trace_buffer_enable = false;
#elif defined(CYGDBG_INFRA_DEBUG_TRACE_BUFFER_PRINT)
        cyg_infra_trace_buffer_pos = 0;
        print_trace_buffer();
#else
#error No trace buffer full mode set
#endif
    }

}

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