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rewinding prompts works

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* libguile/control.h (SCM_PROMPT_HANDLER): Remove, it was unused.
  (SCM_PROMPT_DYNWINDS): Rename from SCM_PROMPT_DYNENV.

* libguile/control.c: (scm_c_make_prompt): Take another arg, the winds
  that are to be in place for the prompt. Fix allocation to be 4 words
  instead of 5 (the handler was never used).

* libguile/eval.c (eval):
* libguile/throw.c (pre_init_catch): Adapt to scm_c_make_prompt change.

* libguile/vm-i-system.c (partial-cont-call): Grovel the new elements of
  the wind list in order to call setjmp() on the new prompts. Pass
  cookie to vm_reinstate_partial_continuation.
  (prompt): Adapt to scm_c_make_prompt change.

* libguile/vm.c (vm_reinstate_partial_continuation): Take a cookie arg,
  used when winding captured prompts onto the stack. Winding a prompt
  implies making a new prompt, actually -- with new registers, a new
  jump buffer, new winds, etc.

* test-suite/tests/control.test ("rewinding prompts"): Add a test for
  rewinding prompts.
This commit is contained in:
Andy Wingo 2010-02-26 13:05:25 +01:00
parent 416f26c753
commit adbdfd6d24
7 changed files with 58 additions and 23 deletions
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2
libguile/eval.c
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@ -432,7 +432,7 @@ eval (SCM x, SCM env)
vm = scm_the_vm ();
prompt = scm_c_make_prompt (eval (CAR (mx), env), SCM_VM_DATA (vm)->fp,
SCM_VM_DATA (vm)->sp, SCM_VM_DATA (vm)->ip,
0, -1);
0, -1, scm_i_dynwinds ());
handler = eval (CDDR (mx), env);
scm_i_set_dynwinds (scm_cons (prompt, scm_i_dynwinds ()));