Andy Wingo a222b0fa91 add multiple values support to the vm ... * libguile/vm-engine.c (vm_run): The bootstrap program now uses mv_call, so as to allow multiple values out of the VM. (It did before, because multiple values were represented internally as single scm_values objects, but now that values go on the stack, we need to note the boot frame as accepting multiple values.) (vm_error_no_values): New error, happens if you pass no values into a single-value continuation. Passing more than one is OK though, it just takes the first one. * libguile/vm-i-system.c (halt): Assume that someone has pushed the number of values onto the stack, and package up that number of values as a scm_values() object, for communication with the interpreter. (mv-call): New instruction, calls a procedure with a multiple-value continuation, even handling calls out to the interpreter. (return/values): New instruction, returns multiple values to the continuation. If the continuation is single-valued, takes the first value or errors if there are no values. Otherwise it returns to the multiple-value return address, pushing the number of values on top of the values. * module/system/il/compile.scm (codegen): Compile <ghil-values> forms. * module/system/il/ghil.scm (<ghil-values>) Add new GHIL data structure and associated procedures. * module/language/scheme/translate.scm (custom-transformer-table): Compile (values .. ) forms into <ghil-values>.		2008-09-14 17:06:52 +02:00
..
language	add multiple values support to the vm	2008-09-14 17:06:52 +02:00
system	add multiple values support to the vm	2008-09-14 17:06:52 +02:00
.cvsignore	*** empty log message ***	2001-04-25 01:55:45 +00:00
Makefile.am	Update Makefile.am's; remove slib import	2008-05-13 00:07:40 +02:00