Val _lib7_Sock_to_log (Task* task, Val arg) {
//===============================================
//
// Mythryl type: String -> Void
//
// Write string to currently open logfile via log_if from
//
// src/c/main/error-reporting.c
ENTER_MYTHRYL_CALLABLE_C_FN(__func__);
char* string = HEAP_STRING_AS_C_STRING( arg );
log_if ("%s", string); // Safer than doing just log_if(string) -- the string might have a '%' in it.
EXIT_MYTHRYL_CALLABLE_C_FN(__func__);
return HEAP_VOID;
}
static void c_signal_handler (int sig, siginfo_t* si, void* c) {
// ================
//
// This is the C signal handler for
// signals that are to be passed to
// the Mythryl level via signal_handler in
//
// src/lib/std/src/nj/runtime-signals-guts.pkg
//
ucontext_t* scp /* This variable is unused on some platforms, so suppress 'unused var' compiler warning: */ __attribute__((unused))
=
(ucontext_t*) c;
Pthread* pthread = SELF_PTHREAD;
// Sanity check: We compile in a MAX_POSIX_SIGNALS value but
// have no way to ensure that we don't wind up getting run
// on some custom kernel supporting more than MAX_POSIX_SIGNAL,
// so we check here to be safe:
//
if (sig >= MAX_POSIX_SIGNALS) die ("posix-signal.c: c_signal_handler: sig d=%d >= MAX_POSIX_SIGNAL %d\n", sig, MAX_POSIX_SIGNALS );
// Remember that we have seen signal number 'sig'.
//
// This will eventually get noticed by choose_signal() in
//
// src/c/machine-dependent/signal-stuff.c
//
pthread->posix_signal_counts[sig].seen_count++;
pthread->all_posix_signals.seen_count++;
log_if(
"posix-signal.c/c_signal_handler: signal d=%d seen_count d=%d done_count d=%d diff d=%d",
sig,
pthread->posix_signal_counts[sig].seen_count,
pthread->posix_signal_counts[sig].done_count,
pthread->posix_signal_counts[sig].seen_count - pthread->posix_signal_counts[sig].done_count
);
#ifdef SIGNAL_DEBUG
debug_say ("c_signal_handler: sig = %d, pending = %d, inHandler = %d\n", sig, pthread->posix_signal_pending, pthread->mythryl_handler_for_posix_signal_is_running);
#endif
// The following line is needed only when
// currently executing "pure" C code, but
// doing it anyway in all other cases will
// not hurt:
//
pthread->ccall_limit_pointer_mask = 0;
if ( pthread->executing_mythryl_code
&& ! pthread->posix_signal_pending
&& ! pthread->mythryl_handler_for_posix_signal_is_running
){
pthread->posix_signal_pending = TRUE;
#ifdef USE_ZERO_LIMIT_PTR_FN
//
SIG_SavePC( pthread->task, scp );
SET_SIGNAL_PROGRAM_COUNTER( scp, Zero_Heap_Allocation_Limit );
#else
SIG_Zero_Heap_Allocation_Limit( scp ); // OK to adjust the heap limit directly.
#endif
}
}
void heapclean_agegroup0 (Task* task, Val** roots) {
// ===================
//
// Do "garbage collection" on just agegroup0.
//
// 'roots' is a vector of live pointers into agegroup0,
// harvested from the live register set, global variables
// into the heap maintained by C code, etc.
//
// This fun is called (only) from:
//
// src/c/heapcleaner/call-heapcleaner.c
//
// NB: If we have multiple hostthreads running,
// each has its own agegroup0, but we process
// all of those during this call, by virtue
// of being passed all the roots from all the
// running hostthreads.
Heap* heap = task->heap;
Agegroup* age1 = heap->agegroup[0];
Vunt age1_tospace_top [ MAX_PLAIN_SIBS ];
//
// Heapcleaner statistics support: We use this to note the
// current start-of-freespace in each generation-one sib buffer.
// At the bottom of this fn, the difference between this and
// the new start-of-freespace gives us the amount of live stuff
// we've copied into that sib. This is pure reportage;
// our algorithms do not depend in any way on this information.
long bytes_allocated = agegroup0_usedspace_in_bytes( task );
//
INCREASE_BIGCOUNTER( &heap->total_bytes_allocated, bytes_allocated );
//
// More heapcleaner statistics reportage.
for (int i = 0; i < MAX_PLAIN_SIBS; i++) {
//
age1_tospace_top[i]
=
(Vunt) age1->sib[ i ]->tospace.first_free;
}
static int callcount = 0;
++callcount;
#ifdef VERBOSE
if (! (callcount & 0xf)) {
//
log_if ("Agegroup 1 before cleaning agegroup0: (call %d) -- heapclean-agegroup0.c", callcount);
//
for (int i = 0; i < MAX_PLAIN_SIBS; i++) {
//
log_if(" %s: to-space bottom = %#x, end of fromspace oldstuff = %#x, tospace.first_free = %#x",
//
sib_name__global[ i+1 ],
//
age1->sib[ i ]->tospace,
age1->sib[ i ]->fromspace.seniorchunks_end,
age1->sib[ i ]->tospace.first_free
);
}
}
#endif
// Scan the standard roots. These are pointers
// to live data harvested from the live registers,
// C globals etc, so all agegroup0 records pointed
// to by them are definitely "live" (nongarbage):
//
{ Sibid* b2s = book_to_sibid__global; // Cache global locally for speed. book_to_sibid__global def in src/c/heapcleaner/heapcleaner-initialization.c
Val* rp;
while ((rp = *roots++) != NULL) {
//
forward_to_agegroup1_if_in_agegroup0( b2s, age1, rp, task );
}
}
// The changelog records all writes to refcells or rw_vectors containing pointer data,
// because such writes might introduce cross-generation pointers that we need to know
// Scan the changelog -- if there are any new // about when doing partial heapcleanings. This makes each such write cost one CONS cell.
// pointers into agegroup0 from other agegroups //
// we need to know about them now: // Updates to tagged-integer values refcells or rw_vectors cannot introduce such pointers,
// // so we do not track them in the changelog and they suffer no slowdown.
//
{ for (int i = 0; i < MAX_HOSTTHREADS; i++) { // Potentially need to process one heap storelog per hostthread.
//
Hostthread* hostthread = hostthread_table__global[ i ];
//
Task* task = hostthread->task;
//
if (hostthread->mode != HOSTTHREAD_IS_VOID) {
//
process_task_heap_changelog( task, heap );
}
}
}
copy_all_remaining_reachable_values_in_agegroup0_to_agegroup1( age1, task );
++heap->agegroup0_heapcleanings_count;
null_out_newly_dead_weakrefs( heap ); // null_out_newly_dead_weakrefs def in src/c/heapcleaner/heapcleaner-stuff.c
////////////////////////////////////////////////////////////
// At this point there is nothing left in the agegroup0
// buffer(s) that we care about, so we're done. Our caller
// will reset the agegroup0 buffer(s) to empty and resume
// allocating linearly in it/them from start to end.
////////////////////////////////////////////////////////////
#ifdef VERBOSE
if (! (callcount & 0xf)) {
log_if ("Agegroup 1 after minorgc: (call %d) -- heapclean-agegroup0.c", callcount);
for (int i = 0; i < MAX_PLAIN_SIBS; i++) {
log_if (" %s: base = %#x, oldTop = %%#x, tospace.first_free = %#x",
sib_name__global[i+1], age1->sib[i]->tospace,
/* age1->sib[i]->oldTop, */ age1->sib[i]->tospace.first_free);
}
}
#endif
// Cleaner statistics stuff:
{
long bytes_copied = 0;
for (int i = 0; i < MAX_PLAIN_SIBS; i++) {
//
int bytes = (Vunt) age1->sib[ i ]->tospace.first_free - age1_tospace_top[ i ];
bytes_copied += bytes;
INCREASE_BIGCOUNTER( &heap->total_bytes_copied_to_sib[ 0 ][ i ], bytes );
}
total_bytes_allocated__global += bytes_allocated; // Never used otherwise.
total_bytes_copied__global += bytes_copied; // Never used otherwise.
#ifndef VERBOSE
if (! (callcount & 0xff)) {
log_if ("DONE minorgc #%d: %d/%d (%5.2f%%) bytes copied; %%d updates (callcount %d) -- heapclean-agegroup0.c",
callcount,
bytes_copied, bytes_allocated,
(bytes_allocated ? (double)(100*bytes_copied)/(double)bytes_allocated : 0.0)
/* update_count__global - nUpdates */);
}
#endif
}
#ifdef CHECK_HEAP
check_heap( heap, 1 ); // check_heap def in src/c/heapcleaner/check-heap.c
#endif
} // fun heapclean_agegroup0
static Val forward_agegroup0_chunk_to_agegroup1 (Agegroup* ag1, Val v, Task* task, int caller) { // 'task' arg is only for debugging, can be removed in production use.
// =====================================
//
// Forward pair/record/vector/string 'v' from agegroup0 to agegroup 1.
// This involves:
//
// o Duplicating v in the appropriate agegroup 1 to-space buffer.
// o Setting v's tagword to FORWARDED_CHUNK_TAGWORD.
// o Setting v's first slot to point to the duplicate.
// o Returning a pointer to the duplicate.
Val* new_chunk;
Vunt len_in_words;
Sib* sib;
Val* chunk = PTR_CAST(Val*, v);
Val tagword = chunk[-1];
switch (GET_BTAG_FROM_TAGWORD( tagword )) {
//
case PAIRS_AND_RECORDS_BTAG:
//
len_in_words = GET_LENGTH_IN_WORDS_FROM_TAGWORD( tagword );
#ifdef NO_PAIR_STRIP // 'NO_PAIR_STRIP' appears nowhere else in the codebase.
sib = ag1->sib[RO_POINTERS_SIB];
#else
if (len_in_words != 2) {
sib = ag1->sib[ RO_POINTERS_SIB ]; // This v is not a pair, so fall through to default code.
} else {
// // This v is a pair, so we'll use special-case code.
sib = ag1->sib[ RO_CONSCELL_SIB ]; // We'll copy it into the dedicated pairs-only sib in agegroup1.
new_chunk = sib->tospace.first_free; // Where to copy it in that sib.
sib->tospace.first_free += 2; // Allocate the space for it.
new_chunk[0] = chunk[0]; // Copy first word of pair.
new_chunk[1] = chunk[1]; // Copy second word of pair.
// Notice that we don't need to copy the tagword -- it is implicit in the fact that we're in the pairsib.
// Set up the forward pointer in the old pair:
//
chunk[-1] = FORWARDED_CHUNK_TAGWORD;
chunk[0] = (Val)(Vunt)new_chunk;
return PTR_CAST( Val, new_chunk ); // Done!
}
#endif
break;
case RO_VECTOR_HEADER_BTAG:
case RW_VECTOR_HEADER_BTAG:
//
len_in_words = 2;
//
sib = ag1->sib[ RO_POINTERS_SIB ];
break; // Fall through to generic-case code.
case RW_VECTOR_DATA_BTAG:
//
len_in_words = GET_LENGTH_IN_WORDS_FROM_TAGWORD( tagword );
//
sib = ag1->sib[ RW_POINTERS_SIB ]; // The RW_POINTERS_SIB allows updates, which the RO_POINTERS_SIB does not.
break; // Fall through to generic-case code.
case FOUR_BYTE_ALIGNED_NONPOINTER_DATA_BTAG:
//
len_in_words = GET_LENGTH_IN_WORDS_FROM_TAGWORD( tagword );
//
sib = ag1->sib[ NONPTR_DATA_SIB ];
break; // Fall through to generic-case code.
case EIGHT_BYTE_ALIGNED_NONPOINTER_DATA_BTAG:
//
len_in_words = GET_LENGTH_IN_WORDS_FROM_TAGWORD( tagword );
//
sib = ag1->sib[ NONPTR_DATA_SIB ];
//
#ifdef ALIGN_FLOAT64S
# ifdef CHECK_HEAP
if (((Vunt)sib->tospace.first_free & WORD_BYTESIZE) == 0) {
//
*sib->tospace.first_free++ = (Val) 0;
}
# else
sib->tospace.first_free = (Val*) (((Vunt)sib->tospace.first_free) | WORD_BYTESIZE);
# endif
#endif
break; // Fall through to generic-case code.
case WEAK_POINTER_OR_SUSPENSION_BTAG:
//
return forward_special_chunk ( ag1, chunk, tagword );
case FORWARDED_CHUNK_BTAG:
//
return PTR_CAST( Val, FOLLOW_FORWARDING_POINTER(chunk)); // We've already copied this one to agegroup1, so just return pointer to copy.
default:
log_if("bad chunk tag %d, chunk = %#x, tagword = %#x -- forward_agegroup0_chunk_to_agegroup1() in src/c/heapcleaner/heapclean-agegroup0.c", GET_BTAG_FROM_TAGWORD(tagword), chunk, tagword);
log_if("forward_agegroup0_chunk_to_agegroup1 was called by %s", caller ? "process_task_heap_changelog" : "forward_to_agegroup1_if_in_agegroup0");
dump_task(task,"forward_agegroup0_chunk_to_agegroup1/default");
die ("bad chunk tag %d, chunk = %#x, tagword = %#x -- forward_agegroup0_chunk_to_agegroup1() in src/c/heapcleaner/heapclean-agegroup0.c", GET_BTAG_FROM_TAGWORD(tagword), chunk, tagword);
exit(1); // Cannot execute -- just to quiet gcc -Wall.
}
// Make an agegroup1 copy of the chunk
// in the appropriate agegroup1 sib (buffer):
//
new_chunk = sib->tospace.first_free; // Figure out where copy will be located.
sib->tospace.first_free += (len_in_words + 1); // Allocate space needed by the copy.
*new_chunk++ = tagword; // Install tagword at start of copy. (Note that 'sib' cannot be RO_CONSCELL_SIB, we handled that case above.)
ASSERT( sib->tospace.first_free <= sib->tospace.limit );
COPYLOOP(chunk, new_chunk, len_in_words); // Copy over the rest of the chunk.
// COPYLOOP def in src/c/heapcleaner/copy-loop.h
// Set up the forwarding pointer in the original
// to the copy and return the new chunk:
//
chunk[-1] = FORWARDED_CHUNK_TAGWORD;
chunk[ 0] = (Val) (Vunt) new_chunk;
return PTR_CAST( Val, new_chunk );
} // fun forward_agegroup0_chunk_to_agegroup1
