CPPGPGPU Library - Reference (Doxygen)

---

Main Page | General Use | Reference | Examples Info | Get/Download CPPGPGPU | SF.net Page

---

DynLoad.cpp

Go to the documentation of this file.

#include "DynLoad.h"
#include <dlfcn.h>
#include <vector>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>

using namespace std;


vector < string > gAllObjects;
vector < string > gAllCurFNames;
vector < void * > gAllDLHandles;

vector < int > gRepCounts;
vector < unsigned > gSecTimes;


extern "C"
{
typedef int (*LoaderFunction)();
};

void * OperatingOldVtable;

//Returns time of modified file, if file cannot be stat'd, -1U is returned.
unsigned DYFileTime( const string sFileName )
{
    struct stat sb;
    sb.st_mtime = -1;
    stat( sFileName.c_str(), &sb );
    return sb.st_mtime;
}


bool LoadModule( const string FullModuleName, int iPlace )
{
    char buf[1024];
    char fname[1024];
    sprintf( fname, "%s.%d.sox", FullModuleName.c_str(), gRepCounts[iPlace] );

    //We set this time up here, so if we have a compile error or something, we don't continue to try to work on it.
    gSecTimes[iPlace] = DYFileTime( FullModuleName + ".cpp" );

    //XXX: Don't re-soxize if it's our first time. (or it's our first time and the sox file is stale)
    if( gRepCounts[iPlace] != 0 || ( gRepCounts[iPlace] == 0 && ( DYFileTime( fname ) < gSecTimes[iPlace] || DYFileTime( fname ) == -1 ) ) )
    {
        //Compile our file.
        snprintf( buf, 1023, "./soxizer %s %d", gAllObjects[iPlace].c_str(), gRepCounts[iPlace] );
        printf( "Exec: %s\n", buf );
        if( system( buf ) != 0 )
        {
            printf( "Compiling failed.  Not loading new version.\n" );
            return false;
        }
    }

    //We have to make an "Operating Object" so we know what the vtable of an old object looks like.
    {
        Node TMPX = NODEMAN->Spawn( gAllObjects[iPlace], "TempObject" );
        if( TMPX.Get() )
            memcpy( &OperatingOldVtable, TMPX.Get(), sizeof( void* ) );
    }

    if( gAllDLHandles[iPlace] )
    {
        dlclose( gAllDLHandles[iPlace] );
        if( gAllCurFNames[iPlace].length() > 0 )
        {
            snprintf( buf, 1023, "rm %s", gAllCurFNames[iPlace].c_str() );
            printf( "Exec: %s\n", buf );
            system( buf );
        }
    }

    gAllCurFNames[iPlace] = fname;
    gAllCurFNames[iPlace] = "./" + gAllCurFNames[iPlace];

    gRepCounts[iPlace]++;

    gAllDLHandles[iPlace] = dlopen( gAllCurFNames[iPlace].c_str(), RTLD_NOW | RTLD_GLOBAL );
    if( !gAllDLHandles[iPlace] )
    {
        printf( "Error opening: %s\n", gAllCurFNames[iPlace].c_str() );
        return false;
    }
    LoaderFunction T = (LoaderFunction)dlsym( gAllDLHandles[iPlace], "RegisterAllInShared" );
    if( !gAllDLHandles[iPlace] )
    {
        printf( "Error finding: RegisterallInShareD() in %s\n", gAllCurFNames[iPlace].c_str() );
        return false;
    }
    T();

    return true;
}

//Tricky -- rotatingly look at only one file per frame.
bool UpdateDynLoad()
{
    static unsigned cur = 0;
    cur = (cur+1)%gAllObjects.size();

    if( gSecTimes[cur] != DYFileTime( gAllObjects[cur] + ".cpp" ) )
    {
        LoadModule( gAllObjects[cur], cur );
    }
}

bool InitDynLoad()
{
    FILE * f = fopen( "modules.lst", "r" );
    if( !f )
    {
        printf( "Error. could not open modules.lst.\n" );
        return false;
    }

    while( !feof( f ) && !ferror( f ) )
    {
        char buffer[128];
        fscanf( f, "%127s\n", buffer );
        gAllObjects.push_back( buffer );
        gAllDLHandles.push_back( 0 );
        gAllCurFNames.push_back( "" );
        gRepCounts.push_back( 0 );
        gSecTimes.push_back( 0 );

        if( !LoadModule( (gAllObjects[gAllObjects.size()-1] ), gAllObjects.size()-1 ) )
            return false;
    }

    fclose( f );
    return true;
}

void RuntimeRegisterObject( const char * sName, ProducerFunct t )
{
    //First, update the current state of things
    NodeManager::Instance()->RegisterType( sName, t);

    map< string, NodeObject* > * inst = NodeManager::Instance()->GetObjectInstanceMap();

    //Create an object under this new scheme so we can extract it's vtable for grafting
    NodeObject * TempObject = t( "TempObject" );
    void * newVTable;
    memcpy( &newVTable, TempObject, sizeof( void* ) );
    delete TempObject;

    //Last, find any existing objects of that type and
    //cut their vtable out.
    for( map< string, NodeObject * >::iterator i = inst->begin(); 
        i != inst->end(); i++ )
    {
        if( memcmp( (i->second), &OperatingOldVtable, sizeof( void * ) ) == 0 )
            memcpy( (i->second), &newVTable, sizeof( void*) );
    }
}



/*
Copyright (c) 2008 Charles Lohr

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/

---

© 2005-2007 Charles Lohr, Joshua Allen, David Chapman, Andrew Lohr. All material including documentation under the MIT/X11 license.