ref: c313c50208ae4805c713e42d94a163139d3471c7
dir: /src/base/ftdbgmem.c/
/***************************************************************************/
/* */
/* ftdbgmem.c */
/* */
/* Memory debugger (body). */
/* */
/* Copyright 2001, 2002, 2003 by */
/* David Turner, Robert Wilhelm, and Werner Lemberg. */
/* */
/* This file is part of the FreeType project, and may only be used, */
/* modified, and distributed under the terms of the FreeType project */
/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
/* this file you indicate that you have read the license and */
/* understand and accept it fully. */
/* */
/***************************************************************************/
#include <ft2build.h>
#include FT_CONFIG_CONFIG_H
#include FT_INTERNAL_DEBUG_H
#include FT_INTERNAL_MEMORY_H
#include FT_SYSTEM_H
#include FT_ERRORS_H
#include FT_TYPES_H
#ifdef FT_DEBUG_MEMORY
#include <stdio.h>
#include <stdlib.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 */
const char* alloc_file_name;
FT_Long alloc_line_no;
const char* free_file_name;
FT_Long free_line_no;
FT_MemNode link;
} FT_MemNodeRec;
typedef struct FT_MemTableRec_
{
FT_ULong size;
FT_ULong nodes;
FT_MemNode* buckets;
FT_ULong alloc_total;
FT_ULong alloc_current;
FT_ULong alloc_max;
FT_ULong alloc_count;
FT_Bool bound_total;
FT_ULong alloc_total_max;
FT_Bool bound_count;
FT_ULong alloc_count_max;
const char* file_name;
FT_Long line_no;
FT_Memory memory;
FT_Pointer memory_user;
FT_Alloc_Func alloc;
FT_Free_Func free;
FT_Realloc_Func realloc;
} FT_MemTableRec;
#define FT_MEM_SIZE_MIN 7
#define FT_MEM_SIZE_MAX 13845163
#define FT_FILENAME( x ) ((x) ? (x) : "unknown file")
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,
};
extern void
ft_mem_debug_panic( const char* fmt, ... )
{
va_list ap;
printf( "FreeType.Debug: " );
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 FT_Pointer
ft_mem_table_alloc( FT_MemTable table,
FT_Long size )
{
FT_Memory memory = table->memory;
FT_Pointer block;
memory->user = table->memory_user;
block = table->alloc( memory, size );
memory->user = table;
return block;
}
static void
ft_mem_table_free( FT_MemTable table,
FT_Pointer block )
{
FT_Memory memory = table->memory;
memory->user = table->memory_user;
table->free( memory, block );
memory->user = table;
}
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 = (FT_MemNode *)
ft_mem_table_alloc( table,
new_size * sizeof ( FT_MemNode ) );
if ( new_buckets == NULL )
return;
FT_MEM_ZERO( new_buckets, 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 )
ft_mem_table_free( table, table->buckets );
table->buckets = new_buckets;
table->size = new_size;
}
}
static FT_MemTable
ft_mem_table_new( FT_Memory memory )
{
FT_MemTable table;
table = (FT_MemTable)memory->alloc( memory, sizeof ( *table ) );
if ( table == NULL )
goto Exit;
FT_MEM_ZERO( table, sizeof ( *table ) );
table->size = FT_MEM_SIZE_MIN;
table->nodes = 0;
table->memory = memory;
table->memory_user = memory->user;
table->alloc = memory->alloc;
table->realloc = memory->realloc;
table->free = memory->free;
table->buckets = (FT_MemNode *)
memory->alloc( memory,
table->size * sizeof ( FT_MemNode ) );
if ( table->buckets )
FT_MEM_ZERO( table->buckets, sizeof ( FT_MemNode ) * table->size );
else
{
memory->free( memory, 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 %8ld in (%s:%ld)\n",
node->address, node->size,
FT_FILENAME( node->alloc_file_name ),
node->alloc_line_no );
leak_count++;
leaks += node->size;
ft_mem_table_free( table, node->address );
}
node->address = NULL;
node->size = 0;
free( node );
node = next;
}
table->buckets[i] = 0;
}
ft_mem_table_free( table, table->buckets );
table->buckets = NULL;
table->size = 0;
table->nodes = 0;
printf(
"FreeType: total memory allocations = %ld\n", table->alloc_total );
printf(
"FreeType: maximum memory footprint = %ld\n", table->alloc_max );
free( table );
if ( leak_count > 0 )
ft_mem_debug_panic(
"FreeType: %ld bytes of memory leaked in %ld blocks\n",
leaks, leak_count );
printf( "FreeType: No 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 (allocating freed block)" );
}
else
{
/* this block was already allocated. This means that our memory */
/* is also corrupted! */
ft_mem_debug_panic(
"memory heap corrupted (re-allocating allocated block)" );
}
}
/* we need to create a new node in this table */
node = (FT_MemNode)ft_mem_table_alloc( table, sizeof ( *node ) );
if ( node == NULL )
ft_mem_debug_panic( "not enough memory to run memory tests" );
node->address = address;
node->size = size;
node->alloc_file_name = table->file_name;
node->alloc_line_no = table->line_no;
node->free_file_name = NULL;
node->free_line_no = 0;
node->link = pnode[0];
pnode[0] = node;
table->nodes++;
table->alloc_total += size;
table->alloc_current += size;
if ( table->alloc_current > table->alloc_max )
table->alloc_max = table->alloc_current;
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 at (%s:%ld)\n"
"block allocated at (%s:%ld) and released at (%s:%ld)",
address,
FT_FILENAME( table->file_name ), table->line_no,
FT_FILENAME( node->alloc_file_name ), node->alloc_line_no,
FT_FILENAME( node->free_file_name ), node->free_line_no );
/* we simply invert the node's size to indicate that the node */
/* was freed. We also change its contents. */
FT_MEM_SET( address, 0xF3, node->size );
table->alloc_current -= node->size;
node->size = -node->size;
node->free_file_name = table->file_name;
node->free_line_no = table->line_no;
}
else
ft_mem_debug_panic(
"trying to free unknown block at %p in (%s:%ld)\n",
address,
FT_FILENAME( table->file_name ), table->line_no );
}
}
extern FT_Pointer
ft_mem_debug_alloc( FT_Memory memory,
FT_Long size )
{
FT_MemTable table = (FT_MemTable)memory->user;
FT_Byte* block;
if ( size <= 0 )
ft_mem_debug_panic( "negative block size allocation (%ld)", size );
/* return NULL if the maximum number of allocations was reached */
if ( table->bound_count &&
table->alloc_count >= table->alloc_count_max )
return NULL;
/* return NULL if this allocation would overflow the maximum heap size */
if ( table->bound_total &&
table->alloc_current + (FT_ULong)size > table->alloc_total_max )
return NULL;
block = (FT_Byte *)ft_mem_table_alloc( table, size );
if ( block )
ft_mem_table_set( table, block, (FT_ULong)size );
table->alloc_count++;
table->file_name = NULL;
table->line_no = 0;
return (FT_Pointer) block;
}
extern void
ft_mem_debug_free( FT_Memory memory,
FT_Pointer block )
{
FT_MemTable table = (FT_MemTable)memory->user;
if ( block == NULL )
ft_mem_debug_panic( "trying to free NULL in (%s:%ld)",
FT_FILENAME( table->file_name ),
table->line_no );
ft_mem_table_remove( table, (FT_Byte*)block );
/* we never really free the block */
table->file_name = NULL;
table->line_no = 0;
}
extern FT_Pointer
ft_mem_debug_realloc( FT_Memory memory,
FT_Long cur_size,
FT_Long new_size,
FT_Pointer block )
{
FT_MemTable table = (FT_MemTable)memory->user;
FT_MemNode node, *pnode;
FT_Pointer new_block;
const char* file_name = FT_FILENAME( table->file_name );
FT_Long line_no = table->line_no;
if ( block == NULL || cur_size == 0 )
ft_mem_debug_panic( "trying to reallocate NULL in (%s:%ld)",
file_name, line_no );
if ( new_size <= 0 )
ft_mem_debug_panic(
"trying to reallocate %p to size 0 (current is %ld) in (%s:%ld)",
block, cur_size, file_name, line_no );
/* 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 in (%s:%ld)",
block, file_name, line_no );
if ( node->size <= 0 )
ft_mem_debug_panic(
"trying to reallocate freed block at %p in (%s:%ld)",
block, file_name, line_no );
if ( node->size != cur_size )
ft_mem_debug_panic( "invalid ft_realloc request for %p. cur_size is "
"%ld instead of %ld in (%s:%ld)",
block, cur_size, node->size, file_name, line_no );
new_block = ft_mem_debug_alloc( memory, new_size );
if ( new_block == NULL )
return NULL;
ft_memcpy( new_block, block, cur_size < new_size ? cur_size : new_size );
table->file_name = file_name;
table->line_no = line_no;
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;
if ( getenv( "FT2_DEBUG_MEMORY" ) )
{
table = ft_mem_table_new( memory );
if ( table )
{
const char* p;
memory->user = table;
memory->alloc = ft_mem_debug_alloc;
memory->realloc = ft_mem_debug_realloc;
memory->free = ft_mem_debug_free;
p = getenv( "FT2_ALLOC_TOTAL_MAX" );
if ( p != NULL )
{
FT_Long total_max = atol(p);
if ( total_max > 0 )
{
table->bound_total = 1;
table->alloc_total_max = (FT_ULong) total_max;
}
}
p = getenv( "FT2_ALLOC_COUNT_MAX" );
if ( p != NULL )
{
FT_Long total_count = atol(p);
if ( total_count > 0 )
{
table->bound_count = 1;
table->alloc_count_max = (FT_ULong) total_count;
}
}
result = 1;
}
}
return result;
}
extern void
ft_mem_debug_done( FT_Memory memory )
{
FT_MemTable table = (FT_MemTable)memory->user;
if ( table )
{
memory->free = table->free;
memory->realloc = table->realloc;
memory->alloc = table->alloc;
ft_mem_table_destroy( table );
memory->user = NULL;
}
}
FT_BASE_DEF( FT_Error )
FT_Alloc_Debug( FT_Memory memory,
FT_Long size,
void* *P,
const char* file_name,
FT_Long line_no )
{
FT_MemTable table = (FT_MemTable)memory->user;
if ( table )
{
table->file_name = file_name;
table->line_no = line_no;
}
return FT_Alloc( memory, size, P );
}
FT_BASE_DEF( FT_Error )
FT_Realloc_Debug( FT_Memory memory,
FT_Long current,
FT_Long size,
void* *P,
const char* file_name,
FT_Long line_no )
{
FT_MemTable table = (FT_MemTable)memory->user;
if ( table )
{
table->file_name = file_name;
table->line_no = line_no;
}
return FT_Realloc( memory, current, size, P );
}
FT_BASE_DEF( void )
FT_Free_Debug( FT_Memory memory,
FT_Pointer block,
const char* file_name,
FT_Long line_no )
{
FT_MemTable table = (FT_MemTable)memory->user;
if ( table )
{
table->file_name = file_name;
table->line_no = line_no;
}
FT_Free( memory, (void **)block );
}
#else /* !FT_DEBUG_MEMORY */
/* ANSI C doesn't like empty source files */
const FT_Byte _debug_mem_dummy = 0;
#endif /* !FT_DEBUG_MEMORY */
/* END */