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Modifed the MemoryNode so that its size will always be a multiple of MEM_BLOCKSIZE. The SlabSingleAllocation is now always a multiple of MEM_BLOCKSIZE, too. Tracking whether a MemoryNode is not supposed to be freed is now accomplished through dedicated flag instead of repurposing the allocation size field.

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This commit is contained in:
obarthel
2023-09-08 16:02:37 +02:00
parent 64ba9b5389
commit fc8051f724
1 changed files with 15 additions and 13 deletions
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28
library/stdlib_memory.h
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@ -150,27 +150,29 @@ extern char * __getcwd(char * buffer,size_t buffer_size,const char *file,int lin
/****************************************************************************/
/* If this flag is set in mn_Size, then this memory allocation
/* If this flag is set in mn_Flags, then this memory allocation
* cannot be released with free() or used with realloc(). This
* flag is set by alloca().
*/
#define MN_SIZE_NEVERFREE (0x80000000UL)
#define MNF_NEVER_FREE (1UL << 0)
/* This obtains the allocation size from a memory node, ignoring
* the "never free" flag altogether.
/* Memory allocations are remembered by this tracking data structure.
* Its size is always a multiple of 8 bytes, which provides memory
* address alignment to a 64-bit boundary.
*/
#define GET_MN_SIZE(mn) ((mn)->mn_Size & ~MN_SIZE_NEVERFREE)
struct MemoryNode
{
#ifdef __MEM_DEBUG
struct MinNode mn_MinNode;
ULONG mn_AllocationSize;
ULONG mn_Flags;
#ifdef __MEM_DEBUG
UBYTE mn_AlreadyFree;
UBYTE mn_Pad0[3];
UBYTE mn_Pad1[3];
void * mn_Allocation;
size_t mn_AllocationSize;
size_t mn_OriginalSize;
char * mn_FreeFile;
int mn_FreeLine;
@ -183,12 +185,10 @@ struct MemoryNode
struct MemoryNode * mn_Right;
struct MemoryNode * mn_Parent;
UBYTE mn_IsRed;
UBYTE mn_Pad1[3];
UBYTE mn_Pad2[3];
#endif /* __USE_MEM_TREES */
#endif /* __MEM_DEBUG */
ULONG mn_Size;
};
#ifdef __USE_MEM_TREES
@ -247,12 +247,14 @@ struct SlabNode
};
/* Memory allocations which are not part of a slab are
* tracked using this data structure.
* tracked using this data structure. This data structure
* is supposed to be a multiple of 8 bytes in size.
*/
struct SlabSingleAllocation
{
struct MinNode ssa_MinNode;
ULONG ssa_Size;
ULONG ssa_Pad;
};
/* This is the global bookkeeping information for managing