/*
* A version of GC_push_all that treats all interior pointers as valid
* and scans part of the area immediately, to make sure that saved
* register values are not lost.
* Cold_gc_frame delimits the stack section that must be scanned
* eagerly. A zero value indicates that no eager scanning is needed.
* We don't need to worry about the MANUAL_VDB case here, since this
* is only called in the single-threaded case. We assume that we
* cannot collect between an assignment and the corresponding
* GC_dirty() call.
*/
STATIC void GC_push_all_stack_partially_eager(ptr_t bottom, ptr_t top,
ptr_t cold_gc_frame)
{
#ifndef NEED_FIXUP_POINTER
if (GC_all_interior_pointers) {
/* Push the hot end of the stack eagerly, so that register values */
/* saved inside GC frames are marked before they disappear. */
/* The rest of the marking can be deferred until later. */
if (0 == cold_gc_frame) {
GC_push_all_stack(bottom, top);
return;
}
GC_ASSERT((word)bottom <= (word)cold_gc_frame
&& (word)cold_gc_frame <= (word)top);
# ifdef STACK_GROWS_DOWN
GC_push_all(cold_gc_frame - sizeof(ptr_t), top);
GC_push_all_eager(bottom, cold_gc_frame);
# else /* STACK_GROWS_UP */
GC_push_all(bottom, cold_gc_frame + sizeof(ptr_t));
GC_push_all_eager(cold_gc_frame, top);
# endif /* STACK_GROWS_UP */
} else
#endif
/* else */ {
GC_push_all_eager(bottom, top);
}
# ifdef TRACE_BUF
GC_add_trace_entry("GC_push_all_stack", (word)bottom, (word)top);
# endif
}
/*ARGSUSED*/
STATIC void GC_push_current_stack(ptr_t cold_gc_frame, void * context)
{
# if defined(THREADS)
if (0 == cold_gc_frame) return;
# ifdef STACK_GROWS_DOWN
GC_push_all_eager(GC_approx_sp(), cold_gc_frame);
/* For IA64, the register stack backing store is handled */
/* in the thread-specific code. */
# else
GC_push_all_eager(cold_gc_frame, GC_approx_sp());
# endif
# else
GC_push_all_stack_part_eager_sections(GC_approx_sp(), GC_stackbottom,
cold_gc_frame, GC_traced_stack_sect);
# ifdef IA64
/* We also need to push the register stack backing store. */
/* This should really be done in the same way as the */
/* regular stack. For now we fudge it a bit. */
/* Note that the backing store grows up, so we can't use */
/* GC_push_all_stack_partially_eager. */
{
ptr_t bsp = GC_save_regs_ret_val;
ptr_t cold_gc_bs_pointer = bsp - 2048;
if (GC_all_interior_pointers &&
cold_gc_bs_pointer > BACKING_STORE_BASE) {
/* Adjust cold_gc_bs_pointer if below our innermost */
/* "traced stack section" in backing store. */
if (GC_traced_stack_sect != NULL && cold_gc_bs_pointer <
GC_traced_stack_sect->backing_store_end)
cold_gc_bs_pointer =
GC_traced_stack_sect->backing_store_end;
GC_push_all_register_sections(BACKING_STORE_BASE,
cold_gc_bs_pointer, FALSE, GC_traced_stack_sect);
GC_push_all_eager(cold_gc_bs_pointer, bsp);
} else {
GC_push_all_register_sections(BACKING_STORE_BASE, bsp,
TRUE /* eager */, GC_traced_stack_sect);
}
/* All values should be sufficiently aligned that we */
/* don't have to worry about the boundary. */
}
# endif
# endif /* !THREADS */
}
/* Similar to GC_push_all_stack_sections() but for IA-64 registers store. */
GC_INNER void GC_push_all_register_sections(ptr_t bs_lo, ptr_t bs_hi,
int eager, struct GC_traced_stack_sect_s *traced_stack_sect)
{
while (traced_stack_sect != NULL) {
ptr_t frame_bs_lo = traced_stack_sect -> backing_store_end;
GC_ASSERT((word)frame_bs_lo <= (word)bs_hi);
if (eager) {
GC_push_all_eager(frame_bs_lo, bs_hi);
} else {
GC_push_all_stack(frame_bs_lo, bs_hi);
}
bs_hi = traced_stack_sect -> saved_backing_store_ptr;
traced_stack_sect = traced_stack_sect -> prev;
}
GC_ASSERT((word)bs_lo <= (word)bs_hi);
if (eager) {
GC_push_all_eager(bs_lo, bs_hi);
} else {
GC_push_all_stack(bs_lo, bs_hi);
}
}
