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This is a complete set of memory allocation functions (malloc and
friends).
The allocator is small, fast and space-efficient.
It performs coalescing on frees.
It has hooks for profiling, tracing and memory leak detection.
It has very comprehensive and paranoid errorchecking as a compile
time option, enough to detect most forms of heap corruption.
Optionally, it attempts to be compatible with the proposed ANSI C
Standard definition for the standard library functions malloc(),
calloc(), realloc() and free(). By default, it is more or less
compatible with existing Unix malloc() functions - some
differences do exist. (Notably free(), cfree() returning void,
realloc() not accepting a freed block)
See the file malloc.doc for the full details.
Porting to other machines shouldn't be hard if they have a civilized C
compiler, and an sbrk().
This malloc() follows the ANSI C standard.
To compile it, make sure ALIGN (in align.h) is correct for your machine, and
make it. testmalloc should run correctly and say Test done if it is
working, producing amazing amounts of heap trace. If it dumps core, it
isn't working...
If you want the malloc to be SVID compliant, define -DSVID_MALLOC_0 so
that malloc(0) will return NULL.
libmalloc.a is a fast, small version, with no
debugging/profiling/tracing, while libmalloc_d.a is the version with
all those three. (Profiling and tracing should not introduce serious
overhead, since profiling is simple and fast, (one 'if' and increment),
while tracing is turned off by default. So you may want to keep
profiling and tracing in the fast version as well)
make clean all
will make libmalloc_d.a and the test programs.
make clean libmalloc
will make libmalloc.a.
For linking convenience, you may want to compile the malloc as one
file instead. To do that, simply make onefile.o. It concatenates all
the src together and compiles it - the include files are protected
against multiple inclusion. This has the advantage of compiling in
things like mal_verify() and mal_trace() even if they aren't used, so
you can use them when debugging.
Mark Moraes.
D. E. Shaw & Co.
moraes@deshaw.com
This malloc was written while I was at the
Computer Systems Research Institute,
Univerity of Toronto.
moraes@csri.toronto.edu
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