freetype/src/base/ftdbgmem.c

#include <ft2build.h>
#include FT_CONFIG_CONFIG_H
#include FT_INTERNAL_DEBUG_H
#include FT_SYSTEM_H
#include FT_ERRORS_H
#include FT_TYPES_H

#ifdef FT_DEBUG_MEMORY


#include <stdio.h>
#include <stdlib.h>
#include <string.h>


  typedef struct FT_MemNodeRec_*   FT_MemNode;
  typedef struct FT_MemTableRec_*  FT_MemTable;

#define  FT_MEM_VAL(addr)   ((FT_ULong)(FT_Pointer)(addr))

  typedef struct FT_MemNodeRec_
  {
    FT_Byte*    address;
    FT_Long     size;     /* < 0 if the block was freed */
    FT_MemNode  link;
  
  } FT_MemNodeRec;

  typedef struct FT_MemTableRec_
  {
    FT_Memory    memory;
    FT_ULong     size;
    FT_ULong     nodes;
    FT_MemNode*  buckets;

    FT_ULong     alloc_total;
    FT_ULong     alloc_current;
  
  } FT_MemTableRec;

#define  FT_MEM_SIZE_MIN   7
#define  FT_MEM_SIZE_MAX   13845163

  static const FT_UInt  ft_mem_primes[] =
  {
    7,
    11,
    19,
    37,
    73,
    109,
    163,
    251,
    367,
    557,
    823,
    1237,
    1861,
    2777,
    4177,
    6247,
    9371,
    14057,
    21089,
    31627,
    47431,
    71143,
    106721,
    160073,
    240101,
    360163,
    540217,
    810343,
    1215497,
    1823231,
    2734867,
    4102283,
    6153409,
    9230113,
    13845163,
  };


#include <stdarg.h>


  extern void
  ft_mem_debug_panic( const char*  fmt, ... )
  {
    va_list  ap;


    printf( "FreeType.DebugMemory: " );

    va_start( ap, fmt );
    vprintf( fmt, ap );
    va_end( ap );

    printf( "\n" );
    exit( EXIT_FAILURE );
  }


  static FT_ULong
  ft_mem_closest_prime( FT_ULong  num )
  {
    FT_UInt  i;

    for ( i = 0; i < sizeof(ft_mem_primes)/sizeof(ft_mem_primes[0]); i++ )
      if ( ft_mem_primes[i] > num )
        return ft_mem_primes[i];

    return FT_MEM_SIZE_MAX;
  }



  static void
  ft_mem_table_resize( FT_MemTable  table )
  {
    FT_ULong  new_size;

    new_size = ft_mem_closest_prime( table->nodes );
    if (new_size != table->size)
    {
      FT_MemNode*  new_buckets ;
      FT_ULong     i;

      new_buckets = malloc( new_size * sizeof(FT_MemNode) );
      if ( new_buckets == NULL )
        return;
      
      memset( new_buckets, 0, sizeof(FT_MemNode)*new_size );
      
      for ( i = 0; i < table->size; i++ )
      {
        FT_MemNode  node, next, *pnode;
        FT_ULong    hash;

        node = table->buckets[i];
        while (node)
        {
          next  = node->link;
          hash  = FT_MEM_VAL(node->address) % new_size;
          pnode = new_buckets + hash;

          node->link = pnode[0];
          pnode[0]   = node;

          node  = next;
        }
      }

      if ( table->buckets )
        free( table->buckets );
        
      table->buckets = new_buckets;
      table->size    = new_size;
    }
  }


  static FT_MemNode
  ft_mem_node_new( FT_MemTable  table,
                   FT_Pointer   address,
                   FT_ULong     size )
  {
    FT_MemNode  node;

    node = malloc( sizeof(*node) );
    if ( node == NULL )
      ft_mem_debug_panic( "not enough memory to run memory tests" );
    
    node->link    = NULL;
    node->address = address;
    node->size    = size;

    return node;
  }


  static void
  ft_mem_node_destroy( FT_MemNode   node,
                        FT_MemTable  table )
  {
    if (node)
    {
      node->address = NULL;
      node->size    = 0;
      node->link    = NULL;

      free( node );
    }
  }



  static FT_MemTable
  ft_mem_table_new( void )
  {
    FT_MemTable  table;

    table = malloc( sizeof(*table) );
    if ( table == NULL ) goto Exit;
    
    memset( table, 0, sizeof(*table) );

    table->size  = FT_MEM_SIZE_MIN;
    table->nodes = 0;

    table->buckets = malloc( table->size * sizeof(FT_MemNode) );
    if ( table->buckets )
      memset( table->buckets, 0, sizeof(FT_MemNode)*table->size );
    else
    {
      free( table );
      table = NULL;
    }
  
  Exit:
    return table;
  }



  static void
  ft_mem_table_destroy( FT_MemTable  table )
  {
    FT_ULong         i;

    if ( table )
    {
      FT_Long   leak_count = 0;
      FT_ULong  leaks = 0;
      
      for ( i = 0; i < table->size; i++ )
      {
        FT_MemNode  *pnode = table->buckets + i, next, node = *pnode;

        while (node)
        {
          next = node->link;
          node->link  = 0;
          
          if ( node->size > 0 )
          {
            printf( "leaked memory block at address %p, size %ld\n",
                     node->address, node->size );
                     
            leak_count++;
            leaks += node->size;
            
            free( node->address );
          }
                   
          node->address = NULL;
          node->size    = 0;
          
          free( node );
          node = next;
        }
        table->buckets[i] = 0;
      }
      free( table->buckets );
      table->buckets = NULL;

      table->size   = 0;
      table->nodes  = 0;
      free( table );
      
      if ( leak_count > 0 )
        ft_mem_debug_panic( "%ld bytes of memory leaked in %ld blocks\n",
                            leaks, leak_count );
      printf( "no FreeType memory leaks detected !!\n" );
    }
  }



  static FT_MemNode*
  ft_mem_table_get_nodep( FT_MemTable  table,
                          FT_Byte*    address )
  {
    FT_ULong          hash;
    FT_MemNode       *pnode, node;

    hash  = FT_MEM_VAL(address);
    pnode = table->buckets + (hash % table->size);

    for (;;)
    {
      node = pnode[0];
      if (!node)
        break;

      if ( node->address == address )
        break;

      pnode = &node->link;
    }
    return pnode;
  }



  static void
  ft_mem_table_set( FT_MemTable  table,
                    FT_Byte*     address,
                    FT_ULong     size )
  {
    FT_MemNode  *pnode, node;

    if (table)
    {
      pnode = ft_mem_table_get_nodep( table, address );
      node  = *pnode;
      if (node)
      {
        if ( node->size < 0 )
        {
          /* this block was already freed. this means that our memory is */
          /* now completely corrupted !!                                 */
          ft_mem_debug_panic( "memory heap corrupted" );
        }
        else
        {
          /* this block was already allocated. this means that our memory */
          /* is also corrupted !!                                         */
          ft_mem_debug_panic( "duplicate block allocation at address "
                           "%p, size %ld\n",
                           address, size );
        }
      }
      
      /* we need to create a new node in this table */
      node = malloc( sizeof(*node) );
      if ( node == NULL )
        ft_mem_debug_panic( "not enough memory to run memory tests" );

      node->address = address;
      node->size    = size;
      node->link    = pnode[0];

      pnode[0] = node;
      table->nodes++;

      table->alloc_total   += size;
      table->alloc_current += size;

      if ( table->nodes*3 < table->size  ||
           table->size *3 < table->nodes )
        ft_mem_table_resize( table );
    }
  }


  static void
  ft_mem_table_remove( FT_MemTable  table,
                       FT_Byte*     address )
  {
    if (table)
    {
      FT_MemNode  *pnode, node;

      pnode = ft_mem_table_get_nodep( table, address );
      node  = *pnode;
      if (node)
      {
        if ( node->size < 0 )
          ft_mem_debug_panic( "freeing memory block at %p more than once !!",
                              address );
        
        /* we simply invert the node's size to indicate that the node */
        /* was freed. We also change its content..                    */
        memset( address, 0xF3, node->size );
        
        table->alloc_current -= node->size;
        node->size            = -node->size;
      }
      else
        ft_mem_debug_panic( "trying to free unknown block at %p\n",
                            address );
    }
  }


  extern FT_Pointer
  ft_mem_debug_alloc( FT_Memory  memory,
                      FT_Long    size )
  {
    FT_MemTable  table = memory->user;
    FT_Byte*     block;

    if ( size <= 0 )
      ft_mem_debug_panic( "negative block size allocation (%ld)", size );
    
    block = malloc( size );
    if ( block )
      ft_mem_table_set( table, block, (FT_ULong)size );
      
    return (FT_Pointer) block;
  }
  

  extern void
  ft_mem_debug_free( FT_Memory   memory,
                     FT_Pointer  block )
  {
    FT_MemTable  table = memory->user;
    
    if ( block == NULL )
      ft_mem_debug_panic( "trying to free NULL !!" );
    
    ft_mem_table_remove( table, (FT_Byte*)block );
    
    /* we never really free the block */
  }
  

  
  extern FT_Pointer
  ft_mem_debug_realloc( FT_Memory   memory,
                        FT_Long     cur_size,
                        FT_Long     new_size,
                        FT_Pointer  block )
  {
    FT_MemTable  table = memory->user;
    FT_MemNode   node, *pnode;
    FT_Pointer   new_block;

    if ( block == NULL || cur_size == 0 )
      ft_mem_debug_panic( "trying to reallocate NULL" );
    
    if ( new_size <= 0 )
      ft_mem_debug_panic( "trying to reallocate %p to size 0 (current is %ld)",
                          block, cur_size );
    
   /* check 'cur_size' value */
    pnode = ft_mem_table_get_nodep( table, (FT_Byte*)block );
    node  = *pnode;
    if (!node)
      ft_mem_debug_panic( "trying to reallocate unknown block at %p",
                          block );
    
    if ( node->size <= 0 )
      ft_mem_debug_panic( "trying to reallocate freed block at %p",
                          block );
    
    if ( node->size != cur_size )
      ft_mem_debug_panic( "invalid realloc request for %p. cur_size is "
                          "%ld instead of %ld", block, cur_size, node->size );
    
    new_block = ft_mem_debug_alloc( memory, new_size );
    if ( new_block == NULL )
      return NULL;

    memcpy( new_block, block, cur_size < new_size ? cur_size : new_size );

    ft_mem_debug_free( memory, (FT_Byte*)block );
    
    return new_block;
  }
  
  
  extern FT_Int
  ft_mem_debug_init( FT_Memory  memory )
  {
    FT_MemTable  table;
    FT_Int       result = 0;
    
    table = ft_mem_table_new();
    if ( table )
    {
      memory->user    = table;
      memory->alloc   = ft_mem_debug_alloc;
      memory->realloc = ft_mem_debug_realloc;
      memory->free    = ft_mem_debug_free;
      result = 1;
    }
    return result;
  }  
  
  
  extern void
  ft_mem_debug_done( FT_Memory  memory )
  {
    FT_MemTable  table = memory->user;
    
    if ( table )
    {
      ft_mem_table_destroy( table );
      memory->user = NULL;
      memory->free = (FT_Free_Func) free;
    }
  }

#else  /* !FT_DEBUG_MEMORY */
 
 /* ansi C doesn't like empty source files */
  extern const FT_Byte  _debug_mem_dummy = 0;

#endif /* !FT_DEBUG_MEMORY */