static MR_bool
MR_find_zone_for_det_ptr(const MR_Word *ptr, MR_Context **ctxt_ptr,
MR_MemoryZone **zone_ptr, int *zone_num_ptr)
{
#ifdef MR_USE_MINIMAL_MODEL_OWN_STACKS
const MR_Dlist *item;
MR_Context *ctxt;
if (MR_find_zone_for_det_ptr_in_context(ptr,
MR_ENGINE(MR_eng_main_context), zone_ptr, zone_num_ptr))
{
if (ctxt_ptr != NULL) {
*ctxt_ptr = MR_ENGINE(MR_eng_main_context);
}
return MR_TRUE;
}
MR_for_dlist(item, MR_ENGINE(MR_eng_gen_contexts)) {
ctxt = (MR_Context *) MR_dlist_data(item);
if (MR_find_zone_for_det_ptr_in_context(ptr, ctxt,
zone_ptr, zone_num_ptr))
{
if (ctxt_ptr != NULL) {
*ctxt_ptr = ctxt;
}
return MR_TRUE;
}
}
void
MR_agc_dump_roots(MR_RootList roots)
{
#ifndef MR_HIGHLEVEL_CODE
MR_Word saved_regs[MR_MAX_FAKE_REG];
MR_Float saved_f_regs[MR_MAX_VIRTUAL_F_REG];
#endif
fflush(NULL);
fprintf(stderr, "Dumping roots\n");
if (MR_debug_agc_print_vars) {
while (roots != NULL) {
#ifndef MR_HIGHLEVEL_CODE
/*
** Restore the registers, because we need to save them to a more
** permanent backing store (we are going to call Mercury soon,
** and we don't want it messing with the saved registers).
*/
MR_restore_registers();
MR_copy_regs_to_saved_regs(MR_MAX_FAKE_REG - 1, saved_regs,
MR_MAX_VIRTUAL_F_REG - 1, saved_f_regs);
MR_hp_word = MR_ENGINE(MR_eng_debug_heap_zone->MR_zone_min);
MR_virtual_hp_word = MR_ENGINE(MR_eng_debug_heap_zone->MR_zone_min);
#endif /* !MR_HIGHLEVEL_CODE */
fflush(NULL);
MR_write_variable(roots->type_info, *roots->root);
fflush(NULL);
fprintf(stderr, "\n");
#ifndef MR_HIGHLEVEL_CODE
MR_copy_saved_regs_to_regs(MR_MAX_FAKE_REG - 1, saved_regs,
MR_MAX_VIRTUAL_F_REG, saved_f_regs);
MR_save_registers();
#endif /* !MR_HIGHLEVEL_CODE */
roots = roots->next;
}
}
}
static void
MR_print_ordinary_regs(FILE *fp)
{
int i;
MR_Integer value;
for (i = 0; i < 8; i++) {
fprintf(fp, "r%d: ", i + 1);
value = (MR_Integer) MR_get_reg(i+1);
#ifndef MR_CONSERVATIVE_GC
if ((MR_Integer) MR_ENGINE(MR_eng_heap_zone)->min <= value
&& value < (MR_Integer) MR_ENGINE(MR_eng_heap_zone)->top)
{
fprintf(fp, "(heap) ");
}
#endif
fprintf(fp, "%ld %lx\n", (long) value, (long) value);
}
}
void
MR_print_heapptr(FILE *fp, const MR_Word *s)
{
#ifdef MR_CONSERVATIVE_GC
fprintf(fp, "heap %" MR_INTEGER_LENGTH_MODIFIER "d", (MR_Integer) s);
#else
fprintf(fp, "heap %3ld",
(long) (MR_Integer) (s - MR_ENGINE(MR_eng_heap_zone)->MR_zone_min));
#endif
if (MR_print_raw_addrs) {
fprintf(fp, " (%p)", (const void *) s);
}
}
void
MR_printheap(FILE *fp, const MR_Word *h)
{
#ifndef MR_CONSERVATIVE_GC
if (MR_print_raw_addrs) {
fprintf(fp, "ptr %p, ", (const void *) h);
}
fprintf(fp, "offset %6ld words\n",
(long) (MR_Integer) (h - MR_ENGINE(MR_eng_heap_zone)->min));
#else
fprintf(fp, "ptr %p\n", (const void *) h);
#endif
}
void
MR_reg_msg(FILE *fp)
{
int i;
MR_Integer x;
if (!MR_lld_print_enabled) {
return;
}
for (i=1; i<=8; i++) {
x = (MR_Integer) MR_get_reg(i);
#ifndef MR_CONSERVATIVE_GC
if ((MR_Integer) MR_ENGINE(MR_eng_heap_zone)->MR_zone_min <= x
&& x < (MR_Integer) MR_ENGINE(MR_eng_heap_zone)->MR_zone_top)
{
x -= (MR_Integer) MR_ENGINE(MR_eng_heap_zone)->MR_zone_min;
}
#endif
fprintf(fp, "%8lx ", (long) x);
}
fprintf(fp, "\n");
}
static void
MR_dump_live_variables(const MR_LabelLayout *label_layout,
MR_MemoryZone *heap_zone, MR_bool top_frame,
MR_Word *stack_pointer, MR_Word *current_frame)
{
int short_var_count;
int long_var_count;
int i;
MR_TypeInfo type_info;
MR_Word value;
MR_TypeInfoParams type_params;
MR_Word saved_regs[MR_MAX_FAKE_REG];
MR_Float saved_f_regs[MR_MAX_VIRTUAL_F_REG];
MR_Word *current_regs;
MR_Float *current_f_regs;
long_var_count = MR_long_desc_var_count(label_layout);
short_var_count = MR_short_desc_var_count(label_layout);
// For the top stack frame, we should pass a pointer to a filled-in
// saved_regs instead of NULL. For other stack frames, passing NULL
// is fine, since output arguments are not live yet for any call
// except the top one.
MR_restore_registers();
MR_copy_regs_to_saved_regs(MR_MAX_FAKE_REG - 1, saved_regs,
MR_MAX_VIRTUAL_F_REG - 1, saved_f_regs);
if (top_frame) {
current_regs = saved_regs;
current_f_regs = saved_f_regs;
} else {
current_regs = NULL;
current_f_regs = NULL;
}
type_params = MR_materialize_type_params_base(label_layout,
current_regs, stack_pointer, current_frame);
for (i = 0; i < long_var_count; i++) {
fprintf(stderr, "%-12s\t", "");
if (MR_PROC_LAYOUT_HAS_PROC_ID(label_layout->MR_sll_entry)) {
MR_print_proc_id(stderr, label_layout->MR_sll_entry);
}
MR_dump_long_value(MR_long_desc_var_locn(label_layout, i),
heap_zone, stack_pointer, current_frame, top_frame);
fprintf(stderr, "\n");
fflush(NULL);
if (MR_debug_agc_print_vars) {
// Call Mercury but use the debugging heap.
MR_hp_word = MR_ENGINE(MR_eng_debug_heap_zone->MR_zone_min);
MR_virtual_hp_word = MR_ENGINE(MR_eng_debug_heap_zone->MR_zone_min);
if (MR_get_type_and_value_base(label_layout, i,
current_regs, stack_pointer, current_frame, current_f_regs,
type_params, &type_info, &value)) {
printf("\t");
MR_write_variable(type_info, value);
printf("\n");
}
fflush(NULL);
}
}
for (i = 0; i < short_var_count; i++) {
fprintf(stderr, "%-12s\t", "");
if (MR_PROC_LAYOUT_HAS_PROC_ID(label_layout->MR_sll_entry)) {
MR_print_proc_id(stderr, label_layout->MR_sll_entry);
}
MR_dump_short_value(MR_short_desc_var_locn(label_layout, i),
heap_zone, stack_pointer, current_frame, top_frame);
fprintf(stderr, "\n");
fflush(NULL);
if (MR_debug_agc_print_vars) {
// Call Mercury but use the debugging heap.
MR_hp_word = MR_ENGINE(MR_eng_debug_heap_zone->MR_zone_min);
MR_virtual_hp_word = MR_ENGINE(MR_eng_debug_heap_zone->MR_zone_min);
if (MR_get_type_and_value_base(label_layout, i,
current_regs, stack_pointer, current_frame, current_f_regs,
type_params, &type_info, &value)) {
printf("\t");
MR_write_variable(type_info, value);
printf("\n");
}
fflush(NULL);
}
}
MR_copy_saved_regs_to_regs(MR_MAX_FAKE_REG - 1, saved_regs,
MR_MAX_VIRTUAL_F_REG - 1, saved_f_regs);
MR_save_registers();
MR_free(type_params);
}
MR_Word *
MR_new_nondetstack_segment(MR_Word *maxfr, int incr)
{
MR_Word *sentinel_maxfr;
MR_Word *old_maxfr;
MR_Word *old_curfr;
MR_MemoryZone *new_cur_zone;
MR_MemoryZones *new_prev_zones;
old_maxfr = maxfr;
old_curfr = MR_curfr;
#ifdef MR_DEBUG_STACK_SEGMENTS
printf("\nadding new nondet stack segment");
printf("\ncontext: %p", &MR_ENGINE(MR_eng_context));
printf("\nold maxfr: ");
MR_printnondetstack(stdout, old_maxfr);
printf("\nold curfr: ");
MR_printnondetstack(stdout, old_curfr);
printf("\n");
#endif
new_cur_zone = MR_rewind_nondetstack_segments(maxfr);
if (new_cur_zone == NULL) {
// There is no old segment to reuse in the nondet stack itself,
// so allocate a new one (possibly one that was freed earlier).
//
// Note that we perform explicit overflow checks, so redzones
// would just waste space.
new_cur_zone = MR_create_or_reuse_zone("nondetstack_segment",
MR_nondetstack_size, 0, 0, MR_default_handler);
}
#ifdef MR_DEBUG_STACK_SEGMENTS
printf("\nbefore creating new nondet segment:\n");
MR_print_zone(stdout, MR_CONTEXT(MR_ctxt_nondetstack_zone));
printf("\n");
#endif
new_prev_zones = MR_GC_malloc_uncollectable_attrib(sizeof(MR_MemoryZones),
MR_ALLOC_SITE_RUNTIME);
new_prev_zones->MR_zones_head = MR_CONTEXT(MR_ctxt_nondetstack_zone);
new_prev_zones->MR_zones_tail = MR_CONTEXT(MR_ctxt_prev_nondetstack_zones);
MR_CONTEXT(MR_ctxt_prev_nondetstack_zones) = new_prev_zones;
MR_CONTEXT(MR_ctxt_nondetstack_zone) = new_cur_zone;
MR_CONTEXT(MR_ctxt_maxfr) = new_cur_zone->MR_zone_min;
MR_maxfr_word = (MR_Word) MR_CONTEXT(MR_ctxt_maxfr);
#ifdef MR_DEBUG_STACK_SEGMENTS
printf("\nafter creating new nondet segment\n");
printf("new maxfr: ");
MR_printnondetstack(stdout, MR_maxfr);
printf("\nnew cur zone:\n");
MR_print_zone(stdout, MR_CONTEXT(MR_ctxt_nondetstack_zone));
printf("new prev zones:\n");
MR_print_zones(stdout, MR_CONTEXT(MR_ctxt_prev_nondetstack_zones));
printf("\n");
fflush(stdout);
#endif
// The stack trace tracing code needs to know the size of each nondet
// stack frame, since it uses the size to classify frames as temp or
// ordinary. The size is given by the difference in address between
// the address of the frame and the address of the previous frame.
// This difference would yield an incorrect size and hence an incorrect
// frame classification if a temp frame were allowed to have a frame
// on a different segment as its immediate predecessor.
//
// We prevent this by putting an ordinary (i.e. non-temp) frame at the
// bottom of every new nondet stack segment as a sentinel. We hand-build
// this frame, since it is not an "ordinary" ordinary frame. It is not
// created by a call, so it has no meaningful success continuation,
// and since it does not make any calls, no other frame's success
// continuation can point to it either.
//
// We store three pieces of information in the sentinel frame.
//
// - The maxfr at the time the sentinel frame was created, which we store
// in the prevfr slot. This is actually the address of the logically
// previous frame, so we are using the slot for its intended purpose,
// but the difference between the addresses of the two frames is NOT
// the size of the sentinel frame.
//
// - The curfr at the time the sentinel frame was created, which we store
// in the succfr slot. This is NOT actually the frame of the success
// continuation; we can store it there because this frame HAS no
// meaningful success continuation, so the slot is not needed for its
// intended purpose.
//
// - The address of the MR_MemoryZone structure of the zone containing
// the sentinel frame, which we store in framevar 1. This is used by
// the code of MR_pop_nondetstack_segment.
sentinel_maxfr = MR_maxfr + (MR_NONDET_FIXED_SIZE + 1);
MR_prevfr_slot_word(sentinel_maxfr) = (MR_Word) old_maxfr;
MR_succfr_slot_word(sentinel_maxfr) = (MR_Word) old_curfr;
MR_succip_slot_word(sentinel_maxfr) =
(MR_Word) MR_ENTRY(MR_do_not_reached);
MR_redofr_slot_word(sentinel_maxfr) = (MR_Word) sentinel_maxfr;
MR_redoip_slot_word(sentinel_maxfr) =
(MR_Word) MR_ENTRY(MR_pop_nondetstack_segment);
MR_based_framevar(sentinel_maxfr, 1) = (MR_Word) new_cur_zone;
#ifdef MR_DEBUG_STACK_SEGMENTS
printf("creating sentinel frame:\n");
printf("sentinel_maxfr: ");
MR_printnondetstack(stdout, sentinel_maxfr);
printf("\nsentinel frame's prevfr slot: ");
MR_printnondetstack(stdout, MR_prevfr_slot(sentinel_maxfr));
printf("\nsentinel frame's succfr slot: ");
MR_printnondetstack(stdout, MR_succfr_slot(sentinel_maxfr));
printf("\nsentinel frame's redofr slot: ");
MR_printnondetstack(stdout, MR_redofr_slot(sentinel_maxfr));
printf("\n");
#endif
// Reserve space for the new nondet stack frame on top of the
// sentinel frame.
MR_maxfr_word = (MR_Word) (sentinel_maxfr + incr);
#ifdef MR_DEBUG_STACK_SEGMENTS
printf("after creating sentinel frame and reserving %d words:\n", incr);
printf("new maxfr: ");
MR_printnondetstack(stdout, MR_maxfr);
printf("\n");
fflush(stdout);
#endif
return MR_maxfr;
}
