08-12-2010
thanks, this is so cool. I can write a script and leave my analysis running overnight now. Thanks again. J
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LEARN ABOUT DEBIAN
trampoline_r
TRAMPOLINE(3) Library Functions Manual TRAMPOLINE(3)
NAME
trampoline - closures as first-class C functions
SYNOPSIS
#include <trampoline_r.h>
function = alloc_trampoline_r(address, data0, data1);
free_trampoline_r(function);
is_trampoline_r(function)
trampoline_r_address(function)
trampoline_r_data0(function)
trampoline_r_data1(function)
DESCRIPTION
These functions implement closures as first-class C functions. A closure consists of a regular C function and a piece of data which gets
passed to the C function when the closure is called.
Closures as first-class C functions means that they fit into a function pointer and can be called exactly like any other C function. func-
tion = alloc_trampoline_r(address, data0, data1) allocates a closure. When function gets called, it stores in a special "lexical chain reg-
ister" a pointer to a storage area containing data0 in its first word and data1 in its second word and calls the C function at address.
The function at address is responsible for fetching data0 and data1 off the pointer. Note that the "lexical chain register" is a call-used
register, i.e. is clobbered by function calls.
This is much like gcc's local functions, except that the GNU C local functions have dynamic extent (i.e. are deallocated when the creating
function returns), while trampoline provides functions with indefinite extent: function is only deallocated when free_trampoline_r(func-
tion) is called.
is_trampoline_r(function) checks whether the C function function was produced by a call to alloc_trampoline_r. If this returns true, the
arguments given to alloc_trampoline_r can be retrieved:
trampoline_r_address(function) returns address,
trampoline_r_data0(function) returns data0,
trampoline_r_data1(function) returns data1.
SEE ALSO
trampoline(3), gcc(1), varargs(3)
PORTING
The way gcc builds local functions is described in the gcc source, file gcc-2.6.3/config/cpu/cpu.h.
AUTHOR
Bruno Haible <bruno@clisp.org>
ACKNOWLEDGEMENTS
Many ideas were cribbed from the gcc source.
22 October 1997 TRAMPOLINE(3)