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digitalmars.D.announce - nogc and NSAutoPool-style regions.

reply "Ola Fosheim =?UTF-8?B?R3LDuHN0YWQi?= writes:
Seems to me that most of the utility beyond maintaining graph 
like structures can be covered by making the compiler aware of 
region allocator semantics. Assuming that the use of GC is 
constrained locally and does not consume too much space. I think 
it would work out ok for loading of smaller files etc with the 
following kind of semantics:

Something_ptr someglobalvar;

process(A a) {
   int x;

    regionalloc(1024,256) { // 1 MiB default size, 256KiB 

	auto y = new ...; // gc new() is hijacked by  regionalloc
	// assignments must be restricted so that new() ptrs and y ptrs
	// are not assigned to memory that can escape the  regionalloc
	// and no writes to global ptrs of region allocated objects 

	auto ptr = compute_with_constrained_gc_semantics(a,y)
	someglobalvar = make_malloc_copy(ptr); // optimization: remove 
	x = obtain_some_value(ptr);

   // region is dead here, including y and ptr objects


The real challenge is in putting the right constraints on the 
 regionalloc block, but I guess weakly pure functions are kind of 
close in their constraints. So it should be possible?

The goal would be to be able to link to libraries that aren't 
 nogc aware without having the GC runtime available. For loading, 
initialization etc.
Jul 08 2014
parent "Ola Fosheim =?UTF-8?B?R3LDuHN0YWQi?= writes:
Wrong forum :-(
Jul 08 2014