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* builds/amiga/makefile.os4 (WARNINGS), builds/compiler/gcc-dev.mk 

(CFLAGS), builds/compiler/gcc.mk (CFLAGS): Remove
-fno-strict-aliasing.


Say you have `(Foo*)x' and want to assign, pass, or return it as
`(Bar*)'.  If you simply say `x' or `(Bar*)x', then the C compiler
would warn you that type casting incompatible pointer types breaks
strict-aliasing.  The solution is to cast to `(void*)' instead which
is the generic pointer type, so the compiler knows that it should
make no strict-aliasing assumption on `x'.  But the problem with
`(void*)x' is that seems like in C++, unlike C, `void*' is not a
generic pointer type and assigning `void*' to `Bar*' without a cast
causes an error.  The solution is to cast to `Bar*' too, with
`(Bar*)(void*)x' as the result -- this is what the patch does.

* include/freetype/cache/ftccache.h (FTC_CACHE_LOOKUP_CMP),
include/freetype/cache/ftcmru.h (FTC_MRULIST_LOOKUP_CMP): Remove
cast on lvalue, use a temporary pointer instead.
Cast temporarily to (void*) to not break strict aliasing.

* include/freetype/internal/ftmemory.h (FT_MEM_ALLOC,
FT_MEM_REALLOC, FT_MEM_QALLOC, FT_MEM_QREALLOC, FT_MEM_FREE),
src/base/ftglyph.c (FT_Glyph_To_Bitmap): Cast temporarily to (void*)
to not break strict aliasing.

* src/base/ftinit.c (FT_USE_MODULE): Fix wrong type information.

* builds/unix/configure.ac (XX_CFLAGS): Remove -fno-strict-aliasing.

* src/sfnt/rules.mk (SFNT_DRV_SRC): Don't include ttsbit0.c --
it is currently loaded from ttsbit.c.


Other formatting.
This commit is contained in:
Werner Lemberg 2005-05-23 21:33:02 +00:00
parent f9e0559778
commit 92aa527a1c
13 changed files with 219 additions and 158 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

47
ChangeLog
View File

@ -1,8 +1,49 @@
2005-05-23 Werner Lemberg <wl@gnu.org>
* builds/amiga/makefile.os4 (WARNINGS), builds/compiler/gcc-dev.mk
(CFLAGS), builds/compiler/gcc.mk (CFLAGS): Remove
-fno-strict-aliasing.
2005-05-23 Behdad Esfahbod <behdad@cs.toronto.edu>
Say you have `(Foo*)x' and want to assign, pass, or return it as
`(Bar*)'. If you simply say `x' or `(Bar*)x', then the C compiler
would warn you that type casting incompatible pointer types breaks
strict-aliasing. The solution is to cast to `(void*)' instead which
is the generic pointer type, so the compiler knows that it should
make no strict-aliasing assumption on `x'. But the problem with
`(void*)x' is that seems like in C++, unlike C, `void*' is not a
generic pointer type and assigning `void*' to `Bar*' without a cast
causes an error. The solution is to cast to `Bar*' too, with
`(Bar*)(void*)x' as the result -- this is what the patch does.
* include/freetype/cache/ftccache.h (FTC_CACHE_LOOKUP_CMP),
include/freetype/cache/ftcmru.h (FTC_MRULIST_LOOKUP_CMP): Remove
cast on lvalue, use a temporary pointer instead.
Cast temporarily to (void*) to not break strict aliasing.
* include/freetype/internal/ftmemory.h (FT_MEM_ALLOC,
FT_MEM_REALLOC, FT_MEM_QALLOC, FT_MEM_QREALLOC, FT_MEM_FREE),
src/base/ftglyph.c (FT_Glyph_To_Bitmap): Cast temporarily to (void*)
to not break strict aliasing.
* src/base/ftinit.c (FT_USE_MODULE): Fix wrong type information.
* builds/unix/configure.ac (XX_CFLAGS): Remove -fno-strict-aliasing.
* src/sfnt/rules.mk (SFNT_DRV_SRC): Don't include ttsbit0.c --
it is currently loaded from ttsbit.c.
2005-05-23 David Turner <dturner@freetype.org>
* include/freetype/cache/ftcache.h, src/cache/ftccache.c,
src/cache/ftcsbits.c: fixing bug #12213 (incorrect behaviour
of the cache sub-system in low-memory conditions).
Fix Savannah bug #12213 (incorrect behaviour of the cache sub-system
in low-memory conditions).
* include/freetype/cache/ftccache.h (FTC_CACHE_TRYLOOP,
FTC_CACHE_TRYLOOP_END): New macros.
* src/cache/ftccache.c (FTC_Cache_NewNode), src/cache/ftcsbits.c
(ftc_snode_compare): Use FT_CACHE_TRYLOOP and FTC_CACE_TRYLOOP_END.
2005-05-23 Werner Lemberg <wl@gnu.org>

2
builds/amiga/makefile.os4
View File

@ -41,7 +41,7 @@ RANLIB = ppc-amigaos-ranlib
DIRFLAGS = -Iinclude -I/FT/src -I/FT/include -I/SDK/include
WARNINGS = -Wall -W -Wundef -Wpointer-arith -Wbad-function-cast \
-Waggregate-return -Wshadow -fno-strict-aliasing
-Waggregate-return -Wshadow
CPU = -mcpu=604e

3
builds/compiler/gcc-dev.mk
View File

@ -3,7 +3,7 @@
#
# Copyright 1996-2000, 2003, 2004 by
# Copyright 1996-2000, 2003, 2004, 2005 by
# David Turner, Robert Wilhelm, and Werner Lemberg.
#
# This file is part of the FreeType project, and may only be used, modified,
@ -68,7 +68,6 @@ ifndef CFLAGS
endif
CFLAGS := -c -g -O0 \
-fno-strict-aliasing \
-Wall \
-W \
-Wundef \

4
builds/compiler/gcc.mk
View File

@ -3,7 +3,7 @@
#
# Copyright 1996-2000, 2003 by
# Copyright 1996-2000, 2003, 2005 by
# David Turner, Robert Wilhelm, and Werner Lemberg.
#
# This file is part of the FreeType project, and may only be used, modified,
@ -62,7 +62,7 @@ T := -o$(space)
# ANSI compliance.
#
ifndef CFLAGS
CFLAGS := -c -g -O6 -Wall -fno-strict-aliasing
CFLAGS := -c -g -O6 -Wall
endif
# ANSIFLAGS: Put there the flags used to make your compiler ANSI-compliant.

2
builds/unix/configure.ac
View File

@ -28,7 +28,7 @@ AC_PROG_CPP
# get compiler flags right
if test "x$CC" = xgcc; then
XX_CFLAGS="-Wall -fno-strict-aliasing"
XX_CFLAGS="-Wall"
XX_ANSIFLAGS="-pedantic -ansi"
else
case "$host" in

83
include/freetype/cache/ftccache.h vendored
View File

@ -4,7 +4,7 @@
/* */
/* FreeType internal cache interface (specification). */
/* */
/* Copyright 2000-2001, 2002, 2003, 2004 by */
/* Copyright 2000-2001, 2002, 2003, 2004, 2005 by */
/* David Turner, Robert Wilhelm, and Werner Lemberg. */
/* */
/* This file is part of the FreeType project, and may only be used, */
@ -248,7 +248,8 @@ FT_BEGIN_HEADER
error = FTC_Cache_NewNode( _cache, _hash, query, &_node ); \
\
_Ok: \
*(FTC_Node*)&(node) = _node; \
_pnode = (FTC_Node*)(void*)&(node); \
*_pnode = _node; \
FT_END_STMNT
#else /* !FTC_INLINE */
@ -262,47 +263,49 @@ FT_BEGIN_HEADER
#endif /* !FTC_INLINE */
/* use this macro with FTC_CACHE_TRYLOOP_END() in order to define
* a retry loop that will flush the cache repeatidely in case of
* memory overflows.
*
* this is used when creating a new cache node, or within a lookup
* that needs to allocate things (e.g. the sbit cache lookup)
*
* here's an example:
*
* {
* FTC_CACHE_TRYLOOP(cache)
* error = load_data( ... );
* FTC_CACHE_TRYLOOP_END()
* }
*
*/
#define FTC_CACHE_TRYLOOP(cache) \
{ \
FTC_Manager _try_manager = FTC_CACHE(cache)->manager; \
FT_UInt _try_count = 4; \
\
for (;;) \
{ \
/*
* This macro, together with FTC_CACHE_TRYLOOP_END, defines a retry
* loop to flush the cache repeatedly in case of memory overflows.
*
* It is used when creating a new cache node, or within a lookup
* that needs to allocate data (e.g., the sbit cache lookup).
*
* Example:
*
* {
* FTC_CACHE_TRYLOOP( cache )
* error = load_data( ... );
* FTC_CACHE_TRYLOOP_END()
* }
*
*/
#define FTC_CACHE_TRYLOOP( cache ) \
{ \
FTC_Manager _try_manager = FTC_CACHE( cache )->manager; \
FT_UInt _try_count = 4; \
\
\
for (;;) \
{ \
FT_UInt _try_done;
#define FTC_CACHE_TRYLOOP_END() \
if ( !error || error != FT_Err_Out_Of_Memory ) \
break; \
\
_try_done = FTC_Manager_FlushN( _try_manager, _try_count ); \
if ( _try_done == 0 ) \
break; \
\
if ( _try_done == _try_count ) \
{ \
_try_count *= 2; \
if ( _try_count < _try_done || _try_count > _try_manager->num_nodes ) \
_try_count = _try_manager->num_nodes; \
} \
} \
#define FTC_CACHE_TRYLOOP_END() \
if ( !error || error != FT_Err_Out_Of_Memory ) \
break; \
\
_try_done = FTC_Manager_FlushN( _try_manager, _try_count ); \
if ( _try_done == 0 ) \
break; \
\
if ( _try_done == _try_count ) \
{ \
_try_count *= 2; \
if ( _try_count < _try_done || \
_try_count > _try_manager->num_nodes ) \
_try_count = _try_manager->num_nodes; \
} \
} \
}
/* */

59
include/freetype/cache/ftcmru.h vendored
View File

@ -4,7 +4,7 @@
/* */
/* Simple MRU list-cache (specification). */
/* */
/* Copyright 2000-2001, 2003, 2004 by */
/* Copyright 2000-2001, 2003, 2004, 2005 by */
/* David Turner, Robert Wilhelm, and Werner Lemberg. */
/* */
/* This file is part of the FreeType project, and may only be used, */
@ -172,34 +172,35 @@ FT_BEGIN_HEADER
FT_BEGIN_STMNT \
FTC_MruNode* _pfirst = &(list)->nodes; \
FTC_MruNode_CompareFunc _compare = (FTC_MruNode_CompareFunc)(compare); \
FTC_MruNode _first, _node; \
\
\
error = 0; \
_first = *(_pfirst); \
_node = NULL; \
\
if ( _first ) \
{ \
_node = _first; \
do \
{ \
if ( _compare( _node, (key) ) ) \
{ \
if ( _node != _first ) \
FTC_MruNode_Up( _pfirst, _node ); \
\
*(FTC_MruNode*)&(node) = _node; \
goto _MruOk; \
} \
_node = _node->next; \
\
} while ( _node != _first) ; \
} \
\
error = FTC_MruList_New( (list), (key), (FTC_MruNode*)&(node) ); \
_MruOk: \
; \
FTC_MruNode _first, _node, *_pnode; \
\
\
error = 0; \
_first = *(_pfirst); \
_node = NULL; \
\
if ( _first ) \
{ \
_node = _first; \
do \
{ \
if ( _compare( _node, (key) ) ) \
{ \
if ( _node != _first ) \
FTC_MruNode_Up( _pfirst, _node ); \
\
_pnode = (FTC_MruNode*)(void*)&(node); \
*_pnode = _node; \
goto _MruOk; \
} \
_node = _node->next; \
\
} while ( _node != _first) ; \
} \
\
error = FTC_MruList_New( (list), (key), (FTC_MruNode*)(void*)&(node) ); \
_MruOk: \
; \
FT_END_STMNT
#define FTC_MRULIST_LOOKUP( list, key, node, error ) \

62
include/freetype/internal/ftmemory.h
View File

@ -290,43 +290,53 @@ FT_BEGIN_HEADER
#ifdef FT_DEBUG_MEMORY
#define FT_MEM_ALLOC( _pointer_, _size_ ) \
FT_Alloc_Debug( memory, _size_, \
(void**)&(_pointer_), __FILE__, __LINE__ )
#define FT_MEM_ALLOC( _pointer_, _size_ ) \
FT_Alloc_Debug( memory, _size_, \
(void**)(void*)&(_pointer_), \
__FILE__, __LINE__ )
#define FT_MEM_REALLOC( _pointer_, _current_, _size_ ) \
FT_Realloc_Debug( memory, _current_, _size_, \
(void**)&(_pointer_), __FILE__, __LINE__ )
#define FT_MEM_REALLOC( _pointer_, _current_, _size_ ) \
FT_Realloc_Debug( memory, _current_, _size_, \
(void**)(void*)&(_pointer_), \
__FILE__, __LINE__ )
#define FT_MEM_QALLOC( _pointer_, _size_ ) \
FT_QAlloc_Debug( memory, _size_, \
(void**)&(_pointer_), __FILE__, __LINE__ )
#define FT_MEM_QALLOC( _pointer_, _size_ ) \
FT_QAlloc_Debug( memory, _size_, \
(void**)(void*)&(_pointer_), \
__FILE__, __LINE__ )
#define FT_MEM_QREALLOC( _pointer_, _current_, _size_ ) \
FT_QRealloc_Debug( memory, _current_, _size_, \
(void**)&(_pointer_), __FILE__, __LINE__ )
#define FT_MEM_QREALLOC( _pointer_, _current_, _size_ ) \
FT_QRealloc_Debug( memory, _current_, _size_, \
(void**)(void*)&(_pointer_), \
__FILE__, __LINE__ )
#define FT_MEM_FREE( _pointer_ ) \
FT_Free_Debug( memory, (void**)&(_pointer_), __FILE__, __LINE__ )
#define FT_MEM_FREE( _pointer_ ) \
FT_Free_Debug( memory, (void**)(void*)&(_pointer_), \
__FILE__, __LINE__ )
#else /* !FT_DEBUG_MEMORY */
#define FT_MEM_ALLOC( _pointer_, _size_ ) \
FT_Alloc( memory, _size_, (void**)&(_pointer_) )
#define FT_MEM_ALLOC( _pointer_, _size_ ) \
FT_Alloc( memory, _size_, \
(void**)(void*)&(_pointer_) )
#define FT_MEM_FREE( _pointer_ ) \
FT_Free( memory, (void**)&(_pointer_) )
#define FT_MEM_FREE( _pointer_ ) \
FT_Free( memory, \
(void**)(void*)&(_pointer_) )
#define FT_MEM_REALLOC( _pointer_, _current_, _size_ ) \
FT_Realloc( memory, _current_, _size_, (void**)&(_pointer_) )
#define FT_MEM_REALLOC( _pointer_, _current_, _size_ ) \
FT_Realloc( memory, _current_, _size_, \
(void**)(void*)&(_pointer_) )
#define FT_MEM_QALLOC( _pointer_, _size_ ) \
FT_QAlloc( memory, _size_, (void**)&(_pointer_) )
#define FT_MEM_QALLOC( _pointer_, _size_ ) \
FT_QAlloc( memory, _size_, \
(void**)(void*)&(_pointer_) )
#define FT_MEM_QREALLOC( _pointer_, _current_, _size_ ) \
FT_QRealloc( memory, _current_, _size_, (void**)&(_pointer_) )
#define FT_MEM_QREALLOC( _pointer_, _current_, _size_ ) \
FT_QRealloc( memory, _current_, _size_, \
(void**)(void*)&(_pointer_) )
#endif /* !FT_DEBUG_MEMORY */
@ -337,7 +347,7 @@ FT_BEGIN_HEADER
/* _typed_ in order to automatically compute array element sizes. */
/* */
#define FT_MEM_NEW( _pointer_ ) \
#define FT_MEM_NEW( _pointer_ ) \
FT_MEM_ALLOC( _pointer_, sizeof ( *(_pointer_) ) )
#define FT_MEM_NEW_ARRAY( _pointer_, _count_ ) \
@ -347,7 +357,7 @@ FT_BEGIN_HEADER
FT_MEM_REALLOC( _pointer_, (_old_) * sizeof ( *(_pointer_) ), \
(_new_) * sizeof ( *(_pointer_) ) )
#define FT_MEM_QNEW( _pointer_ ) \
#define FT_MEM_QNEW( _pointer_ ) \
FT_MEM_QALLOC( _pointer_, sizeof ( *(_pointer_) ) )
#define FT_MEM_QNEW_ARRAY( _pointer_, _count_ ) \

2
src/base/ftglyph.c
View File

@ -603,7 +603,7 @@
/* create result bitmap glyph */
error = ft_new_glyph( glyph->library, &ft_bitmap_glyph_class,
(FT_Glyph*)&bitmap );
(FT_Glyph*)(void*)&bitmap );
if ( error )
goto Exit;

8
src/base/ftinit.c
View File

@ -4,7 +4,7 @@
/* */
/* FreeType initialization layer (body). */
/* */
/* Copyright 1996-2001, 2002 by */
/* Copyright 1996-2001, 2002, 2005 by */
/* David Turner, Robert Wilhelm, and Werner Lemberg. */
/* */
/* This file is part of the FreeType project, and may only be used, */
@ -55,9 +55,9 @@
#undef FT_USE_MODULE
#ifdef __cplusplus
#define FT_USE_MODULE( x ) extern "C" const FT_Module_Class* x;
#define FT_USE_MODULE( x ) extern "C" const FT_Module_Class x;
#else
#define FT_USE_MODULE( x ) extern const FT_Module_Class* x;
#define FT_USE_MODULE( x ) extern const FT_Module_Class x;
#endif
@ -65,7 +65,7 @@
#undef FT_USE_MODULE
#define FT_USE_MODULE( x ) (const FT_Module_Class*)&x,
#define FT_USE_MODULE( x ) (const FT_Module_Class*)&(x),
static
const FT_Module_Class* const ft_default_modules[] =

16
src/cache/ftccache.c vendored
View File

@ -4,7 +4,7 @@
/* */
/* The FreeType internal cache interface (body). */
/* */
/* Copyright 2000-2001, 2002, 2003, 2004 by */
/* Copyright 2000-2001, 2002, 2003, 2004, 2005 by */
/* David Turner, Robert Wilhelm, and Werner Lemberg. */
/* */
/* This file is part of the FreeType project, and may only be used, */
@ -424,12 +424,14 @@
FT_Error error;
FTC_Node node;
/* we use the FTC_CACHE_TRYLOOP macros in order to
* support out-of-memory error (OOM) correctly, i.e.
* by flushing the cache progressively in order to
* make more room
*/
FTC_CACHE_TRYLOOP(cache)
/*
* We use the FTC_CACHE_TRYLOOP macros to support out-of-memory
* errors (OOM) correctly, i.e., by flushing the cache progressively
* in order to make more room.
*/
FTC_CACHE_TRYLOOP( cache )
{
error = cache->clazz.node_new( &node, query, cache );
}

88
src/cache/ftcsbits.c vendored
View File

@ -4,7 +4,7 @@
/* */
/* FreeType sbits manager (body). */
/* */
/* Copyright 2000-2001, 2002, 2003, 2004 by */
/* Copyright 2000-2001, 2002, 2003, 2004, 2005 by */
/* David Turner, Robert Wilhelm, and Werner Lemberg. */
/* */
/* This file is part of the FreeType project, and may only be used, */
@ -85,15 +85,16 @@
}
/* this function tries to load a small bitmap within a given FTC_SNode
* note that it will return a non-zero error code _only_ in the case
* of out-of-memory condition. For all other errors (e.g. corresponding
* to a bad font file), this function will mark the sbit as "unavailable"
* and return a value of 0.
*
* you should also read the comment within the @ftc_snode_compare function
* below to see how out-of-memory is handled during a lookup
*/
/*
* This function tries to load a small bitmap within a given FTC_SNode.
* Note that it returns a non-zero error code _only_ in the case of
* out-of-memory condition. For all other errors (e.g., corresponding
* to a bad font file), this function will mark the sbit as `unavailable'
* and return a value of 0.
*
* You should also read the comment within the @ftc_snode_compare
* function below to see how out-of-memory is handled during a lookup.
*/
static FT_Error
ftc_snode_load( FTC_SNode snode,
FTC_Manager manager,
@ -324,43 +325,48 @@
FTC_SBit sbit = snode->sbits + ( gindex - gnode->gindex );
/* the following code illustrates what to do when you want to
* perform operations that may fail within a lookup function.
*
* here, we want to load a small bitmap on-demand, we thus
* need to call the 'ftc_snode_load' function which may return
* a non-zero error code only when we're out of memory
*
* the correct thing to do is to use @FTC_CACHE_TRYLOOP and
* @FTC_CACHE_TRYLOOP_END in order to implement a retry loop
* that is capable of flushing the cache incrementally when
* OOM errors occur.
*
* however, we previously need to 'lock' the node to prevent it
* from being flushed in the loop.
*
* when we exit the loop, we unlock the node then check the 'error'
* variable. If it is non-zero, this means that the cache was
* completely flushed and that no usable memory was found to load
* the bitmap.
*
* we then prefer to return a value of 0 (i.e. NO MATCH). This
* will ensure that the caller will try to allocate a new node.
* this operation _will_ fail and the lookup function will return
* the OOM error code appropriately.
*
* note that 'buffer == NULL && width == 255' is a hack used to
* tag "unavailable" bitmaps in the array. We should never try
* to load these.
*/
/*
* The following code illustrates what to do when you want to
* perform operations that may fail within a lookup function.
*
* Here, we want to load a small bitmap on-demand; we thus
* need to call the `ftc_snode_load' function which may return
* a non-zero error code only when we are out of memory (OOM).
*
* The correct thing to do is to use @FTC_CACHE_TRYLOOP and
* @FTC_CACHE_TRYLOOP_END in order to implement a retry loop
* that is capable of flushing the cache incrementally when
* an OOM errors occur.
*
* However, we need to `lock' the node before this operation to
* prevent it from being flushed within the loop.
*
* When we exit the loop, we unlock the node, then check the `error'
* variable. If it is non-zero, this means that the cache was
* completely flushed and that no usable memory was found to load
* the bitmap.
*
* We then prefer to return a value of 0 (i.e., NO MATCH). This
* ensures that the caller will try to allocate a new node.
* This operation consequently _fail_ and the lookup function
* returns the appropriate OOM error code.
*
* Note that `buffer == NULL && width == 255' is a hack used to
* tag `unavailable' bitmaps in the array. We should never try
* to load these.
*
*/
if ( sbit->buffer == NULL && sbit->width != 255 )
{
FT_ULong size;
FT_Error error;
ftcsnode->ref_count++; /* lock node, prevent flushing in retry loop */
FTC_CACHE_TRYLOOP(cache)
ftcsnode->ref_count++; /* lock node to prevent flushing */
/* in retry loop */
FTC_CACHE_TRYLOOP( cache )
{
error = ftc_snode_load( snode, cache->manager, gindex, &size );
}

1
src/sfnt/rules.mk
View File

@ -28,7 +28,6 @@ SFNT_COMPILE := $(FT_COMPILE) $I$(subst /,$(COMPILER_SEP),$(SFNT_DIR))
SFNT_DRV_SRC := $(SFNT_DIR)/ttload.c \
$(SFNT_DIR)/ttcmap.c \
$(SFNT_DIR)/ttsbit.c \
$(SFNT_DIR)/ttsbit0.c \
$(SFNT_DIR)/ttpost.c \
$(SFNT_DIR)/ttkern.c \
$(SFNT_DIR)/sfobjs.c \