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scm_call_n sets up boot continuation frame for VM

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* libguile/vm-engine.c:
* libguile/vm.c (scm_call_n): Move boot continuation setup to
  scm_call_n, so that vm-engine takes all of its state from the vp.
This commit is contained in:
Andy Wingo 2013-11-21 19:05:43 +01:00
commit bd63e5b2c3
2 changed files with 38 additions and 45 deletions
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38
libguile/vm.c
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@ -706,8 +706,7 @@ initialize_default_stack_size (void)
#undef VM_USE_HOOKS
#undef VM_NAME
typedef SCM (*scm_t_vm_engine) (scm_i_thread *current_thread, struct scm_vm *vp,
SCM program, SCM *argv, size_t nargs);
typedef SCM (*scm_t_vm_engine) (scm_i_thread *current_thread, struct scm_vm *vp);
static const scm_t_vm_engine vm_engines[SCM_VM_NUM_ENGINES] =
{ vm_regular_engine, vm_debug_engine };
@ -808,12 +807,45 @@ scm_call_n (SCM proc, SCM *argv, size_t nargs)
{
scm_i_thread *thread;
struct scm_vm *vp;
SCM *base;
ptrdiff_t base_frame_size;
size_t i;
thread = SCM_I_CURRENT_THREAD;
vp = thread_vm (thread);
SCM_CHECK_STACK;
return vm_engines[vp->engine](thread, vp, proc, argv, nargs);
/* Check that we have enough space: 3 words for the boot
continuation, 3 + nargs for the procedure application, and 3 for
setting up a new frame. */
base_frame_size = 3 + 3 + nargs + 3;
vp->sp += base_frame_size;
if (vp->sp >= vp->stack_limit)
vm_error_stack_overflow (vp);
base = vp->sp + 1 - base_frame_size;
/* Since it's possible to receive the arguments on the stack itself,
shuffle up the arguments first. */
for (i = nargs; i > 0; i--)
base[6 + i - 1] = argv[i - 1];
/* Push the boot continuation, which calls PROC and returns its
result(s). */
base[0] = SCM_PACK (vp->fp); /* dynamic link */
base[1] = SCM_PACK (vp->ip); /* ra */
base[2] = vm_boot_continuation;
vp->fp = &base[2];
vp->ip = (scm_t_uint32 *) vm_boot_continuation_code;
/* The pending call to PROC. */
base[3] = SCM_PACK (vp->fp); /* dynamic link */
base[4] = SCM_PACK (vp->ip); /* ra */
base[5] = proc;
vp->fp = &base[5];
vp->sp = &SCM_FRAME_LOCAL (vp->fp, nargs);
return vm_engines[vp->engine](thread, vp);
}
/* Scheme interface */