Memory Allocation
Detailed Description
Tidy uses a user provided allocator for all memory allocations. If this allocator is not provided, then a default allocator is used which simply wraps standard C malloc/free calls. These wrappers call the panic function upon any failure. The default panic function prints an out of memory message to stderr, and calls exit(2).
For applications in which it is unacceptable to abort in the case of memory allocation, then the panic function can be replaced with one which longjmps() out of the tidy code. For this to clean up completely, you should be careful not to use any tidy methods that open files as these will not be closed before panic() is called.
TODO: associate file handles with tidyDoc and ensure that tidyDocRelease() can close them all.
Calling the withAllocator() family ( tidyCreateWithAllocator, tidyBufInitWithAllocator, tidyBufAllocWithAllocator) allow settings custom allocators).
All parts of the document use the same allocator. Calls that require a user provided buffer can optionally use a different allocator.
For reference in designing a plug-in allocator, most allocations made by tidy are less than 100 bytes, corresponding to attribute names/values, etc.
There is also an additional class of much larger allocations which are where most of the data from the lexer is stored. (It is not currently possible to use a separate allocator for the lexer, this would be a useful extension).
In general, approximately 1/3rd of the memory used by tidy is freed during the parse, so if memory usage is an issue then an allocator that can reuse this memory is a good idea.
Typedef Documentation
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The allocators function table |
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Callback for "malloc" replacement |
typedef void*(TIDY_CALL * TidyRealloc)(void *buf, size_t len) |
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Callback for "realloc" replacement |
typedef void(TIDY_CALL * TidyFree)(void *buf) |
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Callback for "free" replacement |
typedef void(TIDY_CALL * TidyPanic)(ctmbstr mssg) |
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Callback for "out of memory" panic state |
Function Documentation
Bool TIDY_CALL tidySetMallocCall |
( |
TidyMalloc |
fmalloc |
) |
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Give Tidy a malloc() replacement |
Bool TIDY_CALL tidySetReallocCall |
( |
TidyRealloc |
frealloc |
) |
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Give Tidy a realloc() replacement |
Bool TIDY_CALL tidySetFreeCall |
( |
TidyFree |
ffree |
) |
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Give Tidy a free() replacement |
Bool TIDY_CALL tidySetPanicCall |
( |
TidyPanic |
fpanic |
) |
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Give Tidy an "out of memory" handler |
Generated on Tue Jun 12 11:48:14 2012 for HTML Tidy by
1.4.6