kc3-lang/freetype/src/base/ftexcept.c

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• Hash : 10937304
  Author :
  Date : 2002-05-01T08:46:56
  

  * include/freetype/internal/fthash.h, src/base/fthash.c: adding a generic implementation of dynamic hash tables using linear algorithm (to get rid of 'stalls' during resizes). This will be used in the future in at least three parts of the library: the cache sub-system, the object sub-system and the memory debugger. * include/freetype/internal/ftcore.h: added this header file to group all new definitions related to exception handling and memory management. It's very likely that this file will disappear or be renamed in the future.. * include/freetype/internal/ftobject.h, include/freetype/ftsysmem.h: adding comments to better explain the object sub-system as well as the new memory manager interface.

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• src/base/ftexcept.c

• #include <ft2build.h>
  #include FT_EXCEPT_H
  
  
    FT_BASE_DEF( void )
    ft_cleanup_stack_init( FT_CleanupStack  stack,
                           FT_Memory        memory )
    {
      stack->chunk = &stack->chunk_0;
      stack->top   = stack->chunk->items;
      stack->limit = stack->top + FT_CLEANUP_CHUNK_SIZE;
      stack->chunk_0.link = NULL;
  
      stack->memory = memory;
    }
  
  
  
    FT_BASE_DEF( void )
    ft_cleanup_stack_done( FT_CleanupStack  stack )
    {
      FT_Memory        memory = stack->memory;
      FT_CleanupChunk  chunk, next;
  
      for (;;)
      {
        chunk = stack->chunk;
        if ( chunk == &stack->chunk_0 )
          break;
  
        stack->chunk = chunk->link;
  
        FT_Free( chunk, memory );
      }
  
      stack->memory = NULL;
    }
  
  
  
    FT_BASE_DEF( void )
    ft_cleanup_stack_push( FT_CleanupStack  stack,
                           FT_Pointer       item,
                           FT_CleanupFunc   item_func,
                           FT_Pointer       item_data )
    {
      FT_CleanupItem  top;
  
  
      FT_ASSERT( stack && stack->chunk && stack->top );
      FT_ASSERT( item  && item_func );
  
      top = stack->top;
  
      top->item      = item;
      top->item_func = item_func;
      top->item_data = item_data;
  
      top ++;
  
      if ( top == stack->limit )
      {
        FT_CleanupChunk  chunk;
  
        chunk = FT_QAlloc( sizeof(*chunk), stack->memory );
  
        chunk->link  = stack->chunk;
        stack->chunk = chunk;
        stack->limit = chunk->items + FT_CLEANUP_CHUNK_SIZE;
        top          = chunk->items;
      }
  
      stack->top = top;
    }
  
  
  
    FT_BASE_DEF( void )
    ft_cleanup_stack_pop( FT_CleanupStack   stack,
                          FT_Int            destroy )
    {
      FT_CleanupItem  top;
  
  
      FT_ASSERT( stack && stack->chunk && stack->top );
      top = stack->top;
  
      if ( top == stack->chunk->items )
      {
        FT_CleanupChunk  chunk;
  
        chunk = stack->chunk;
  
        if ( chunk == &stack->chunk_0 )
        {
          FT_ERROR(( "cleanup.pop: empty cleanup stack !!\n" ));
          ft_cleanup_throw( stack, FT_Err_EmptyCleanupStack );
        }
  
        chunk = chunk->link;
        FT_QFree( stack->chunk, stack->memory );
  
        stack->chunk = chunk;
        stack->limit = chunk->items + FT_CLEANUP_CHUNK_SIZE;
        top          = stack->limit;
      }
  
      top --;
  
      if ( destroy )
        top->item_func( top->item, top->item_data );
  
      top->item      = NULL;
      top->item_func = NULL;
      top->item_data = NULL;
  
      stack->top = top;
    }
  
  
  
    FT_BASE_DEF( FT_CleanupItem )
    ft_cleanup_stack_peek( FT_CleanupStack  stack )
    {
      FT_CleanupItem   top;
      FT_CleanupChunk  chunk;
  
  
      FT_ASSERT( stack && stack->chunk && stack->top );
  
      top   = stack->top;
      chunk = stack->chunk;
  
      if ( top > chunk->items )
        top--;
      else
      {
        chunk = chunk->link;
        top   = NULL;
        if ( chunk != NULL )
          top = chunk->items + FT_CLEANUP_CHUNK_SIZE - 1;
      }
      return top;
    }
  
  
  
    FT_BASE_DEF( void )
    ft_xhandler_enter( FT_XHandler  xhandler,
                       FT_Memory    memory )
    {
      FT_CleanupStack  stack = FT_MEMORY__CLEANUP(memory);
  
      xhandler->previous = stack->xhandler;
      xhandler->cleanup  = stack->top;
      xhandler->error    = 0;
      stack->xhandler    = xhandler;
    }
  
  
  
    FT_BASE_DEF( void )
    ft_xhandler_exit( FT_XHandler  xhandler )
    {
      FT_CleanupStack  stack = FT_MEMORY__CLEANUP(memory);
  
      stack->xhandler    = xhandler->previous;
      xhandler->previous = NULL;
      xhandler->error    = error;
      xhandler->cleanup  = NULL;
    }
  
  
  
    FT_BASE_DEF( void )
    ft_cleanup_throw( FT_CleanupStack  stack,
                      FT_Error         error )
    {
      FT_XHandler  xhandler = stack->xhandler;
  
      if ( xhandler == NULL )
      {
        /* no exception handler was registered. this  */
        /* means that we have an un-handled exception */
        /* the only thing we can do is _PANIC_ and    */
        /* halt the current program..                 */
        /*                                            */
        FT_ERROR(( "FREETYPE PANIC: An un-handled exception occured. Program aborted" ));
        ft_exit(1);
      }
  
      /* cleanup the stack until we reach the handler's */
      /* starting stack location..                      */
  
      xhandler->error = error;
      longmp( xhandler->jump_buffer, 1 );
    }                    

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