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staticdata_utils.c
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// inverse of backedges graph (caller=>callees hash)
jl_array_t *edges_map JL_GLOBALLY_ROOTED = NULL; // rooted for the duration of our uses of this
static void write_float64(ios_t *s, double x) JL_NOTSAFEPOINT
{
write_uint64(s, *((uint64_t*)&x));
}
// Decide if `t` must be new, because it points to something new.
// If it is new, the object (in particular, the super field) might not be entirely
// valid for the cache, so we want to finish transforming it before attempting
// to look in the cache for it
int must_be_new_dt(jl_value_t *t, htable_t *news, char *image_base, size_t sizeof_sysimg)
{
//if (jl_object_in_image(t))
// return 0; // fast-path for rejection
assert(ptrhash_get(news, (void*)t) != (void*)t);
if (ptrhash_has(news, (void*)t) || ptrhash_has(news, (void*)jl_typeof(t)))
return 1;
if (!(image_base < (char*)t && (char*)t <= image_base + sizeof_sysimg))
return 0; // fast-path for rejection
if (jl_is_uniontype(t)) {
jl_uniontype_t *u = (jl_uniontype_t*)t;
return must_be_new_dt(u->a, news, image_base, sizeof_sysimg) ||
must_be_new_dt(u->b, news, image_base, sizeof_sysimg);
}
else if (jl_is_unionall(t)) {
jl_unionall_t *ua = (jl_unionall_t*)t;
return must_be_new_dt((jl_value_t*)ua->var, news, image_base, sizeof_sysimg) ||
must_be_new_dt(ua->body, news, image_base, sizeof_sysimg);
}
else if (jl_is_typevar(t)) {
jl_tvar_t *tv = (jl_tvar_t*)t;
return must_be_new_dt(tv->lb, news, image_base, sizeof_sysimg) ||
must_be_new_dt(tv->ub, news, image_base, sizeof_sysimg);
}
else if (jl_is_vararg(t)) {
jl_vararg_t *tv = (jl_vararg_t*)t;
if (tv->T && must_be_new_dt(tv->T, news, image_base, sizeof_sysimg))
return 1;
if (tv->N && must_be_new_dt(tv->N, news, image_base, sizeof_sysimg))
return 1;
}
else if (jl_is_datatype(t)) {
jl_datatype_t *dt = (jl_datatype_t*)t;
assert(jl_object_in_image((jl_value_t*)dt->name) && "type_in_worklist mistake?");
jl_datatype_t *super = dt->super;
// check if super is news, since then we must be new also
// (it is also possible that super is indeterminate now, wait for `t`
// to be resolved, then will be determined later and fixed up by the
// delay_list, for this and any other references to it).
while (super != jl_any_type) {
assert(super);
if (ptrhash_has(news, (void*)super))
return 1;
if (!(image_base < (char*)super && (char*)super <= image_base + sizeof_sysimg))
break; // fast-path for rejection of super
// otherwise super might be something that was not cached even though a later supertype might be
// for example while handling `Type{Mask{4, U} where U}`, if we have `Mask{4, U} <: AbstractSIMDVector{4}`
super = super->super;
}
jl_svec_t *tt = dt->parameters;
size_t i, l = jl_svec_len(tt);
for (i = 0; i < l; i++)
if (must_be_new_dt(jl_tparam(dt, i), news, image_base, sizeof_sysimg))
return 1;
}
else {
return must_be_new_dt(jl_typeof(t), news, image_base, sizeof_sysimg);
}
return 0;
}
static uint64_t jl_worklist_key(jl_array_t *worklist) JL_NOTSAFEPOINT
{
assert(jl_is_array(worklist));
size_t len = jl_array_len(worklist);
if (len > 0) {
jl_module_t *topmod = (jl_module_t*)jl_array_ptr_ref(worklist, len-1);
assert(jl_is_module(topmod));
return topmod->build_id.lo;
}
return 0;
}
static jl_array_t *newly_inferred JL_GLOBALLY_ROOTED /*FIXME*/;
// Mutex for newly_inferred
jl_mutex_t newly_inferred_mutex;
// Register array of newly-inferred MethodInstances
// This gets called as the first step of Base.include_package_for_output
JL_DLLEXPORT void jl_set_newly_inferred(jl_value_t* _newly_inferred)
{
assert(_newly_inferred == NULL || jl_is_array(_newly_inferred));
newly_inferred = (jl_array_t*) _newly_inferred;
}
JL_DLLEXPORT void jl_push_newly_inferred(jl_value_t* ci)
{
JL_LOCK(&newly_inferred_mutex);
size_t end = jl_array_len(newly_inferred);
jl_array_grow_end(newly_inferred, 1);
jl_arrayset(newly_inferred, ci, end);
JL_UNLOCK(&newly_inferred_mutex);
}
// compute whether a type references something internal to worklist
// and thus could not have existed before deserialize
// and thus does not need delayed unique-ing
static int type_in_worklist(jl_value_t *v) JL_NOTSAFEPOINT
{
if (jl_object_in_image(v))
return 0; // fast-path for rejection
if (jl_is_uniontype(v)) {
jl_uniontype_t *u = (jl_uniontype_t*)v;
return type_in_worklist(u->a) ||
type_in_worklist(u->b);
}
else if (jl_is_unionall(v)) {
jl_unionall_t *ua = (jl_unionall_t*)v;
return type_in_worklist((jl_value_t*)ua->var) ||
type_in_worklist(ua->body);
}
else if (jl_is_typevar(v)) {
jl_tvar_t *tv = (jl_tvar_t*)v;
return type_in_worklist(tv->lb) ||
type_in_worklist(tv->ub);
}
else if (jl_is_vararg(v)) {
jl_vararg_t *tv = (jl_vararg_t*)v;
if (tv->T && type_in_worklist(tv->T))
return 1;
if (tv->N && type_in_worklist(tv->N))
return 1;
}
else if (jl_is_datatype(v)) {
jl_datatype_t *dt = (jl_datatype_t*)v;
if (!jl_object_in_image((jl_value_t*)dt->name))
return 1;
jl_svec_t *tt = dt->parameters;
size_t i, l = jl_svec_len(tt);
for (i = 0; i < l; i++)
if (type_in_worklist(jl_tparam(dt, i)))
return 1;
}
else {
return type_in_worklist(jl_typeof(v));
}
return 0;
}
// When we infer external method instances, ensure they link back to the
// package. Otherwise they might be, e.g., for external macros.
// Implements Tarjan's SCC (strongly connected components) algorithm, simplified to remove the count variable
static int has_backedge_to_worklist(jl_method_instance_t *mi, htable_t *visited, arraylist_t *stack)
{
jl_module_t *mod = mi->def.module;
if (jl_is_method(mod))
mod = ((jl_method_t*)mod)->module;
assert(jl_is_module(mod));
if (mi->precompiled || !jl_object_in_image((jl_value_t*)mod) || type_in_worklist(mi->specTypes)) {
return 1;
}
if (!mi->backedges) {
return 0;
}
void **bp = ptrhash_bp(visited, mi);
// HT_NOTFOUND: not yet analyzed
// HT_NOTFOUND + 1: no link back
// HT_NOTFOUND + 2: does link back
// HT_NOTFOUND + 3: does link back, and included in new_specializations already
// HT_NOTFOUND + 4 + depth: in-progress
int found = (char*)*bp - (char*)HT_NOTFOUND;
if (found)
return found - 1;
arraylist_push(stack, (void*)mi);
int depth = stack->len;
*bp = (void*)((char*)HT_NOTFOUND + 4 + depth); // preliminarily mark as in-progress
size_t i = 0, n = jl_array_len(mi->backedges);
int cycle = depth;
while (i < n) {
jl_method_instance_t *be;
i = get_next_edge(mi->backedges, i, NULL, &be);
int child_found = has_backedge_to_worklist(be, visited, stack);
if (child_found == 1 || child_found == 2) {
// found what we were looking for, so terminate early
found = 1;
break;
}
else if (child_found >= 3 && child_found - 3 < cycle) {
// record the cycle will resolve at depth "cycle"
cycle = child_found - 3;
assert(cycle);
}
}
if (!found && cycle != depth)
return cycle + 3;
// If we are the top of the current cycle, now mark all other parts of
// our cycle with what we found.
// Or if we found a backedge, also mark all of the other parts of the
// cycle as also having an backedge.
while (stack->len >= depth) {
void *mi = arraylist_pop(stack);
bp = ptrhash_bp(visited, mi);
assert((char*)*bp - (char*)HT_NOTFOUND == 5 + stack->len);
*bp = (void*)((char*)HT_NOTFOUND + 1 + found);
}
return found;
}
// Given the list of CodeInstances that were inferred during the build, select
// those that are (1) external, (2) still valid, (3) are inferred to be called
// from the worklist or explicitly added by a `precompile` statement, and
// (4) are the most recently computed result for that method.
// These will be preserved in the image.
static jl_array_t *queue_external_cis(jl_array_t *list)
{
if (list == NULL)
return NULL;
size_t i;
htable_t visited;
arraylist_t stack;
assert(jl_is_array(list));
size_t n0 = jl_array_len(list);
htable_new(&visited, n0);
arraylist_new(&stack, 0);
jl_array_t *new_specializations = jl_alloc_vec_any(0);
JL_GC_PUSH1(&new_specializations);
for (i = n0; i-- > 0; ) {
jl_code_instance_t *ci = (jl_code_instance_t*)jl_array_ptr_ref(list, i);
assert(jl_is_code_instance(ci));
if (!ci->relocatability)
continue;
jl_method_instance_t *mi = ci->def;
jl_method_t *m = mi->def.method;
if (ci->inferred && jl_is_method(m) && jl_object_in_image((jl_value_t*)m->module)) {
int found = has_backedge_to_worklist(mi, &visited, &stack);
assert(found == 0 || found == 1 || found == 2);
assert(stack.len == 0);
if (found == 1 && ci->max_world == ~(size_t)0) {
void **bp = ptrhash_bp(&visited, mi);
if (*bp != (void*)((char*)HT_NOTFOUND + 3)) {
*bp = (void*)((char*)HT_NOTFOUND + 3);
jl_array_ptr_1d_push(new_specializations, (jl_value_t*)ci);
}
}
}
}
htable_free(&visited);
arraylist_free(&stack);
JL_GC_POP();
// reverse new_specializations
n0 = jl_array_len(new_specializations);
jl_value_t **news = (jl_value_t**)jl_array_data(new_specializations);
for (i = 0; i < n0; i++) {
jl_value_t *temp = news[i];
news[i] = news[n0 - i - 1];
news[n0 - i - 1] = temp;
}
return new_specializations;
}
// New roots for external methods
static void jl_collect_new_roots(jl_array_t *roots, jl_array_t *new_specializations, uint64_t key)
{
htable_t mset;
htable_new(&mset, 0);
size_t l = new_specializations ? jl_array_len(new_specializations) : 0;
for (size_t i = 0; i < l; i++) {
jl_code_instance_t *ci = (jl_code_instance_t*)jl_array_ptr_ref(new_specializations, i);
assert(jl_is_code_instance(ci));
jl_method_t *m = ci->def->def.method;
assert(jl_is_method(m));
PTRHASH_PIN(m)
ptrhash_put(&mset, (void*)m, (void*)m);
}
int nwithkey;
void *const *table = mset.table;
jl_array_t *newroots = NULL;
JL_GC_PUSH1(&newroots);
for (size_t i = 0; i < mset.size; i += 2) {
if (table[i+1] != HT_NOTFOUND) {
jl_method_t *m = (jl_method_t*)table[i];
assert(jl_is_method(m));
nwithkey = nroots_with_key(m, key);
if (nwithkey) {
jl_array_ptr_1d_push(roots, (jl_value_t*)m);
newroots = jl_alloc_vec_any(nwithkey);
jl_array_ptr_1d_push(roots, (jl_value_t*)newroots);
rle_iter_state rootiter = rle_iter_init(0);
uint64_t *rletable = NULL;
size_t nblocks2 = 0, nroots = jl_array_len(m->roots), k = 0;
if (m->root_blocks) {
rletable = (uint64_t*)jl_array_data(m->root_blocks);
nblocks2 = jl_array_len(m->root_blocks);
}
while (rle_iter_increment(&rootiter, nroots, rletable, nblocks2))
if (rootiter.key == key)
jl_array_ptr_set(newroots, k++, jl_array_ptr_ref(m->roots, rootiter.i));
assert(k == nwithkey);
}
}
}
JL_GC_POP();
htable_free(&mset);
}
// Create the forward-edge map (caller => callees)
// the intent of these functions is to invert the backedges tree
// for anything that points to a method not part of the worklist
//
// from MethodTables
static void jl_collect_missing_backedges(jl_methtable_t *mt)
{
jl_array_t *backedges = mt->backedges;
if (backedges) {
size_t i, l = jl_array_len(backedges);
for (i = 1; i < l; i += 2) {
jl_method_instance_t *caller = (jl_method_instance_t*)jl_array_ptr_ref(backedges, i);
jl_value_t *missing_callee = jl_array_ptr_ref(backedges, i - 1); // signature of abstract callee
jl_array_t *edges = (jl_array_t*)jl_eqtable_get(edges_map, (jl_value_t*)caller, NULL);
if (edges == NULL) {
edges = jl_alloc_vec_any(0);
JL_GC_PUSH1(&edges);
edges_map = jl_eqtable_put(edges_map, (jl_value_t*)caller, (jl_value_t*)edges, NULL);
JL_GC_POP();
}
jl_array_ptr_1d_push(edges, NULL);
jl_array_ptr_1d_push(edges, missing_callee);
}
}
}
// from MethodInstances
static void collect_backedges(jl_method_instance_t *callee, int internal)
{
jl_array_t *backedges = callee->backedges;
if (backedges) {
size_t i = 0, l = jl_array_len(backedges);
while (i < l) {
jl_value_t *invokeTypes;
jl_method_instance_t *caller;
i = get_next_edge(backedges, i, &invokeTypes, &caller);
jl_array_t *edges = (jl_array_t*)jl_eqtable_get(edges_map, (jl_value_t*)caller, NULL);
if (edges == NULL) {
edges = jl_alloc_vec_any(0);
JL_GC_PUSH1(&edges);
edges_map = jl_eqtable_put(edges_map, (jl_value_t*)caller, (jl_value_t*)edges, NULL);
JL_GC_POP();
}
jl_array_ptr_1d_push(edges, invokeTypes);
jl_array_ptr_1d_push(edges, (jl_value_t*)callee);
}
}
}
// For functions owned by modules not on the worklist, call this on each method.
// - if the method is owned by a worklist module, add it to the list of things to be
// fully serialized
// - Collect all backedges (may be needed later when we invert this list).
static int jl_collect_methcache_from_mod(jl_typemap_entry_t *ml, void *closure)
{
jl_array_t *s = (jl_array_t*)closure;
jl_method_t *m = ml->func.method;
if (s && !jl_object_in_image((jl_value_t*)m->module)) {
jl_array_ptr_1d_push(s, (jl_value_t*)m);
}
if (edges_map == NULL)
return 1;
jl_value_t *specializations = jl_atomic_load_relaxed(&m->specializations);
if (!jl_is_svec(specializations)) {
jl_method_instance_t *callee = (jl_method_instance_t*)specializations;
collect_backedges(callee, !s);
}
else {
size_t i, l = jl_svec_len(specializations);
for (i = 0; i < l; i++) {
jl_method_instance_t *callee = (jl_method_instance_t*)jl_svecref(specializations, i);
if ((jl_value_t*)callee != jl_nothing)
collect_backedges(callee, !s);
}
}
return 1;
}
static int jl_collect_methtable_from_mod(jl_methtable_t *mt, void *env)
{
if (!jl_object_in_image((jl_value_t*)mt))
env = NULL; // do not collect any methods from here
jl_typemap_visitor(jl_atomic_load_relaxed(&mt->defs), jl_collect_methcache_from_mod, env);
if (env && edges_map)
jl_collect_missing_backedges(mt);
return 1;
}
// Collect methods of external functions defined by modules in the worklist
// "extext" = "extending external"
// Also collect relevant backedges
static void jl_collect_extext_methods_from_mod(jl_array_t *s, jl_module_t *m)
{
foreach_mtable_in_module(m, jl_collect_methtable_from_mod, s);
}
static void jl_record_edges(jl_method_instance_t *caller, arraylist_t *wq, jl_array_t *edges)
{
jl_array_t *callees = NULL;
JL_GC_PUSH2(&caller, &callees);
callees = (jl_array_t*)jl_eqtable_pop(edges_map, (jl_value_t*)caller, NULL, NULL);
if (callees != NULL) {
jl_array_ptr_1d_push(edges, (jl_value_t*)caller);
jl_array_ptr_1d_push(edges, (jl_value_t*)callees);
size_t i, l = jl_array_len(callees);
for (i = 1; i < l; i += 2) {
jl_method_instance_t *c = (jl_method_instance_t*)jl_array_ptr_ref(callees, i);
if (c && jl_is_method_instance(c)) {
arraylist_push(wq, c);
}
}
}
JL_GC_POP();
}
// Extract `edges` and `ext_targets` from `edges_map`
// `edges` = [caller1, targets_indexes1, ...], the list of methods and their edges
// `ext_targets` is [invokesig1, callee1, matches1, ...], the edges for each target
static void jl_collect_edges(jl_array_t *edges, jl_array_t *ext_targets, jl_array_t *external_cis, size_t world)
{
htable_t external_mis;
htable_new(&external_mis, 0);
if (external_cis) {
for (size_t i = 0; i < jl_array_len(external_cis); i++) {
jl_code_instance_t *ci = (jl_code_instance_t*)jl_array_ptr_ref(external_cis, i);
jl_method_instance_t *mi = ci->def;
PTRHASH_PIN(mi)
ptrhash_put(&external_mis, (void*)mi, (void*)mi);
}
}
arraylist_t wq;
arraylist_new(&wq, 0);
void **table = (void**)jl_array_data(edges_map); // edges_map is caller => callees
size_t table_size = jl_array_len(edges_map);
for (size_t i = 0; i < table_size; i += 2) {
assert(table == jl_array_data(edges_map) && table_size == jl_array_len(edges_map) &&
"edges_map changed during iteration");
jl_method_instance_t *caller = (jl_method_instance_t*)table[i];
jl_array_t *callees = (jl_array_t*)table[i + 1];
if (callees == NULL)
continue;
assert(jl_is_method_instance(caller) && jl_is_method(caller->def.method));
if (!jl_object_in_image((jl_value_t*)caller->def.method->module) ||
ptrhash_get(&external_mis, caller) != HT_NOTFOUND) {
jl_record_edges(caller, &wq, edges);
}
}
htable_free(&external_mis);
while (wq.len) {
jl_method_instance_t *caller = (jl_method_instance_t*)arraylist_pop(&wq);
jl_record_edges(caller, &wq, edges);
}
arraylist_free(&wq);
edges_map = NULL;
htable_t edges_map2;
htable_new(&edges_map2, 0);
htable_t edges_ids;
size_t l = edges ? jl_array_len(edges) : 0;
htable_new(&edges_ids, l);
for (size_t i = 0; i < l / 2; i++) {
jl_method_instance_t *caller = (jl_method_instance_t*)jl_array_ptr_ref(edges, i * 2);
void *target = (void*)((char*)HT_NOTFOUND + i + 1);
PTRHASH_PIN(caller)
PTRHASH_PIN(target)
ptrhash_put(&edges_ids, (void*)caller, target);
}
// process target list to turn it into a memoized validity table
// and compute the old methods list, ready for serialization
jl_value_t *matches = NULL;
jl_array_t *callee_ids = NULL;
jl_value_t *sig = NULL;
JL_GC_PUSH3(&matches, &callee_ids, &sig);
for (size_t i = 0; i < l; i += 2) {
jl_array_t *callees = (jl_array_t*)jl_array_ptr_ref(edges, i + 1);
size_t l = jl_array_len(callees);
callee_ids = jl_alloc_array_1d(jl_array_int32_type, l + 1);
int32_t *idxs = (int32_t*)jl_array_data(callee_ids);
idxs[0] = 0;
size_t nt = 0;
for (size_t j = 0; j < l; j += 2) {
jl_value_t *invokeTypes = jl_array_ptr_ref(callees, j);
jl_value_t *callee = jl_array_ptr_ref(callees, j + 1);
assert(callee && "unsupported edge");
if (jl_is_method_instance(callee)) {
jl_methtable_t *mt = jl_method_get_table(((jl_method_instance_t*)callee)->def.method);
if (!jl_object_in_image((jl_value_t*)mt))
continue;
}
// (nullptr, c) => call
// (invokeTypes, c) => invoke
// (nullptr, invokeTypes) => missing call
// (invokeTypes, nullptr) => missing invoke (unused--inferred as Any)
void *target = ptrhash_get(&edges_map2, invokeTypes ? (void*)invokeTypes : (void*)callee);
if (target == HT_NOTFOUND) {
size_t min_valid = 0;
size_t max_valid = ~(size_t)0;
if (invokeTypes) {
assert(jl_is_method_instance(callee));
jl_methtable_t *mt = jl_method_get_table(((jl_method_instance_t*)callee)->def.method);
if ((jl_value_t*)mt == jl_nothing) {
callee_ids = NULL; // invalid
break;
}
else {
matches = jl_gf_invoke_lookup_worlds(invokeTypes, (jl_value_t*)mt, world, &min_valid, &max_valid);
if (matches == jl_nothing) {
callee_ids = NULL; // invalid
break;
}
matches = (jl_value_t*)((jl_method_match_t*)matches)->method;
}
}
else {
if (jl_is_method_instance(callee)) {
jl_method_instance_t *mi = (jl_method_instance_t*)callee;
sig = jl_type_intersection(mi->def.method->sig, (jl_value_t*)mi->specTypes);
}
else {
sig = callee;
}
int ambig = 0;
matches = jl_matching_methods((jl_tupletype_t*)sig, jl_nothing,
INT32_MAX, 0, world, &min_valid, &max_valid, &ambig);
sig = NULL;
if (matches == jl_nothing) {
callee_ids = NULL; // invalid
break;
}
size_t k;
for (k = 0; k < jl_array_len(matches); k++) {
jl_method_match_t *match = (jl_method_match_t *)jl_array_ptr_ref(matches, k);
jl_array_ptr_set(matches, k, match->method);
}
}
jl_array_ptr_1d_push(ext_targets, invokeTypes);
jl_array_ptr_1d_push(ext_targets, callee);
jl_array_ptr_1d_push(ext_targets, matches);
target = (void*)((char*)HT_NOTFOUND + jl_array_len(ext_targets) / 3);
PTRHASH_PIN(callee)
PTRHASH_PIN(target)
ptrhash_put(&edges_map2, (void*)callee, target);
}
idxs[++nt] = (char*)target - (char*)HT_NOTFOUND - 1;
}
jl_array_ptr_set(edges, i + 1, callee_ids); // swap callees for ids
if (!callee_ids)
continue;
idxs[0] = nt;
// record place of every method in edges
// add method edges to the callee_ids list
for (size_t j = 0; j < l; j += 2) {
jl_value_t *callee = jl_array_ptr_ref(callees, j + 1);
if (callee && jl_is_method_instance(callee)) {
void *target = ptrhash_get(&edges_ids, (void*)callee);
if (target != HT_NOTFOUND) {
idxs[++nt] = (char*)target - (char*)HT_NOTFOUND - 1;
}
}
}
jl_array_del_end(callee_ids, l - nt);
}
JL_GC_POP();
htable_free(&edges_map2);
}
// Headers
// serialize information about all loaded modules
static void write_mod_list(ios_t *s, jl_array_t *a)
{
size_t i;
size_t len = jl_array_len(a);
for (i = 0; i < len; i++) {
jl_module_t *m = (jl_module_t*)jl_array_ptr_ref(a, i);
assert(jl_is_module(m));
if (jl_object_in_image((jl_value_t*)m)) {
const char *modname = jl_symbol_name(m->name);
size_t l = strlen(modname);
write_int32(s, l);
ios_write(s, modname, l);
write_uint64(s, m->uuid.hi);
write_uint64(s, m->uuid.lo);
write_uint64(s, m->build_id.hi);
write_uint64(s, m->build_id.lo);
}
}
write_int32(s, 0);
}
// OPT_LEVEL should always be the upper bits
#define OPT_LEVEL 6
JL_DLLEXPORT uint8_t jl_cache_flags(void)
{
// OOICCDDP
uint8_t flags = 0;
flags |= (jl_options.use_pkgimages & 1); // 0-bit
flags |= (jl_options.debug_level & 3) << 1; // 1-2 bit
flags |= (jl_options.check_bounds & 3) << 3; // 3-4 bit
flags |= (jl_options.can_inline & 1) << 5; // 5-bit
flags |= (jl_options.opt_level & 3) << OPT_LEVEL; // 6-7 bit
return flags;
}
JL_DLLEXPORT uint8_t jl_match_cache_flags(uint8_t flags)
{
// 1. Check which flags are relevant
uint8_t current_flags = jl_cache_flags();
uint8_t supports_pkgimage = (current_flags & 1);
uint8_t is_pkgimage = (flags & 1);
// For .ji packages ignore other flags
if (!supports_pkgimage && !is_pkgimage) {
return 1;
}
// 2. Check all flags, execept opt level must be exact
uint8_t mask = (1 << OPT_LEVEL)-1;
if ((flags & mask) != (current_flags & mask))
return 0;
// 3. allow for higher optimization flags in cache
flags >>= OPT_LEVEL;
current_flags >>= OPT_LEVEL;
return flags >= current_flags;
}
// "magic" string and version header of .ji file
static const int JI_FORMAT_VERSION = 12;
static const char JI_MAGIC[] = "\373jli\r\n\032\n"; // based on PNG signature
static const uint16_t BOM = 0xFEFF; // byte-order marker
static int64_t write_header(ios_t *s, uint8_t pkgimage)
{
ios_write(s, JI_MAGIC, strlen(JI_MAGIC));
write_uint16(s, JI_FORMAT_VERSION);
ios_write(s, (char *) &BOM, 2);
write_uint8(s, sizeof(void*));
ios_write(s, JL_BUILD_UNAME, strlen(JL_BUILD_UNAME)+1);
ios_write(s, JL_BUILD_ARCH, strlen(JL_BUILD_ARCH)+1);
ios_write(s, JULIA_VERSION_STRING, strlen(JULIA_VERSION_STRING)+1);
const char *branch = jl_git_branch(), *commit = jl_git_commit();
ios_write(s, branch, strlen(branch)+1);
ios_write(s, commit, strlen(commit)+1);
write_uint8(s, pkgimage);
int64_t checksumpos = ios_pos(s);
write_uint64(s, 0); // eventually will hold checksum for the content portion of this (build_id.hi)
write_uint64(s, 0); // eventually will hold dataendpos
write_uint64(s, 0); // eventually will hold datastartpos
return checksumpos;
}
// serialize information about the result of deserializing this file
static void write_worklist_for_header(ios_t *s, jl_array_t *worklist)
{
int i, l = jl_array_len(worklist);
for (i = 0; i < l; i++) {
jl_module_t *workmod = (jl_module_t*)jl_array_ptr_ref(worklist, i);
if (workmod->parent == jl_main_module || workmod->parent == workmod) {
size_t l = strlen(jl_symbol_name(workmod->name));
write_int32(s, l);
ios_write(s, jl_symbol_name(workmod->name), l);
write_uint64(s, workmod->uuid.hi);
write_uint64(s, workmod->uuid.lo);
write_uint64(s, workmod->build_id.lo);
}
}
write_int32(s, 0);
}
static void write_module_path(ios_t *s, jl_module_t *depmod) JL_NOTSAFEPOINT
{
if (depmod->parent == jl_main_module || depmod->parent == depmod)
return;
const char *mname = jl_symbol_name(depmod->name);
size_t slen = strlen(mname);
write_module_path(s, depmod->parent);
write_int32(s, slen);
ios_write(s, mname, slen);
}
// Cache file header
// Serialize the global Base._require_dependencies array of pathnames that
// are include dependencies. Also write Preferences and return
// the location of the srctext "pointer" in the header index.
static int64_t write_dependency_list(ios_t *s, jl_array_t* worklist, jl_array_t **udepsp)
{
int64_t initial_pos = 0;
int64_t pos = 0;
static jl_array_t *deps = NULL;
if (!deps)
deps = (jl_array_t*)jl_get_global(jl_base_module, jl_symbol("_require_dependencies"));
// unique(deps) to eliminate duplicates while preserving order:
// we preserve order so that the topmost included .jl file comes first
static jl_value_t *unique_func = NULL;
if (!unique_func)
unique_func = jl_get_global(jl_base_module, jl_symbol("unique"));
jl_value_t *uniqargs[2] = {unique_func, (jl_value_t*)deps};
jl_task_t *ct = jl_current_task;
size_t last_age = ct->world_age;
ct->world_age = jl_atomic_load_acquire(&jl_world_counter);
jl_array_t *udeps = (*udepsp = deps && unique_func ? (jl_array_t*)jl_apply(uniqargs, 2) : NULL);
ct->world_age = last_age;
// write a placeholder for total size so that we can quickly seek past all of the
// dependencies if we don't need them
initial_pos = ios_pos(s);
write_uint64(s, 0);
size_t i, l = udeps ? jl_array_len(udeps) : 0;
for (i = 0; i < l; i++) {
jl_value_t *deptuple = jl_array_ptr_ref(udeps, i);
jl_value_t *dep = jl_fieldref(deptuple, 1); // file abspath
size_t slen = jl_string_len(dep);
write_int32(s, slen);
ios_write(s, jl_string_data(dep), slen);
write_float64(s, jl_unbox_float64(jl_fieldref(deptuple, 2))); // mtime
jl_module_t *depmod = (jl_module_t*)jl_fieldref(deptuple, 0); // evaluating module
jl_module_t *depmod_top = depmod;
while (depmod_top->parent != jl_main_module && depmod_top->parent != depmod_top)
depmod_top = depmod_top->parent;
unsigned provides = 0;
size_t j, lj = jl_array_len(worklist);
for (j = 0; j < lj; j++) {
jl_module_t *workmod = (jl_module_t*)jl_array_ptr_ref(worklist, j);
if (workmod->parent == jl_main_module || workmod->parent == workmod) {
++provides;
if (workmod == depmod_top) {
write_int32(s, provides);
write_module_path(s, depmod);
break;
}
}
}
write_int32(s, 0);
}
write_int32(s, 0); // terminator, for ease of reading
// Calculate Preferences hash for current package.
jl_value_t *prefs_hash = NULL;
jl_value_t *prefs_list = NULL;
JL_GC_PUSH1(&prefs_list);
if (jl_base_module) {
// Toplevel module is the module we're currently compiling, use it to get our preferences hash
jl_value_t * toplevel = (jl_value_t*)jl_get_global(jl_base_module, jl_symbol("__toplevel__"));
jl_value_t * prefs_hash_func = jl_get_global(jl_base_module, jl_symbol("get_preferences_hash"));
jl_value_t * get_compiletime_prefs_func = jl_get_global(jl_base_module, jl_symbol("get_compiletime_preferences"));
if (toplevel && prefs_hash_func && get_compiletime_prefs_func) {
// Temporary invoke in newest world age
size_t last_age = ct->world_age;
ct->world_age = jl_atomic_load_acquire(&jl_world_counter);
// call get_compiletime_prefs(__toplevel__)
jl_value_t *args[3] = {get_compiletime_prefs_func, (jl_value_t*)toplevel, NULL};
prefs_list = (jl_value_t*)jl_apply(args, 2);
// Call get_preferences_hash(__toplevel__, prefs_list)
args[0] = prefs_hash_func;
args[2] = prefs_list;
prefs_hash = (jl_value_t*)jl_apply(args, 3);
// Reset world age to normal
ct->world_age = last_age;
}
}
// If we successfully got the preferences, write it out, otherwise write `0` for this `.ji` file.
if (prefs_hash != NULL && prefs_list != NULL) {
size_t i, l = jl_array_len(prefs_list);
for (i = 0; i < l; i++) {
jl_value_t *pref_name = jl_array_ptr_ref(prefs_list, i);
size_t slen = jl_string_len(pref_name);
write_int32(s, slen);
ios_write(s, jl_string_data(pref_name), slen);
}
write_int32(s, 0); // terminator
write_uint64(s, jl_unbox_uint64(prefs_hash));
}
else {
// This is an error path, but let's at least generate a valid `.ji` file.
// We declare an empty list of preference names, followed by a zero-hash.
// The zero-hash is not what would be generated for an empty set of preferences,
// and so this `.ji` file will be invalidated by a future non-erroring pass
// through this function.
write_int32(s, 0);
write_uint64(s, 0);
}
JL_GC_POP(); // for prefs_list
// write a dummy file position to indicate the beginning of the source-text
pos = ios_pos(s);
ios_seek(s, initial_pos);
write_uint64(s, pos - initial_pos);
ios_seek(s, pos);
write_uint64(s, 0);
return pos;
}
// Deserialization
// Add methods to external (non-worklist-owned) functions
static void jl_insert_methods(jl_array_t *list)
{
size_t i, l = jl_array_len(list);
for (i = 0; i < l; i++) {
jl_method_t *meth = (jl_method_t*)jl_array_ptr_ref(list, i);
assert(jl_is_method(meth));
assert(!meth->is_for_opaque_closure);
jl_methtable_t *mt = jl_method_get_table(meth);
assert((jl_value_t*)mt != jl_nothing);
jl_method_table_insert(mt, meth, NULL);
}
}
static void jl_copy_roots(jl_array_t *method_roots_list, uint64_t key)
{
size_t i, l = jl_array_len(method_roots_list);
for (i = 0; i < l; i+=2) {
jl_method_t *m = (jl_method_t*)jl_array_ptr_ref(method_roots_list, i);
jl_array_t *roots = (jl_array_t*)jl_array_ptr_ref(method_roots_list, i+1);
if (roots) {
assert(jl_is_array(roots));
jl_append_method_roots(m, key, roots);
}
}
}
// verify that these edges intersect with the same methods as before
static jl_array_t *jl_verify_edges(jl_array_t *targets, size_t minworld)
{
JL_TIMING(VERIFY_IMAGE, VERIFY_Edges);
size_t i, l = jl_array_len(targets) / 3;
static jl_value_t *ulong_array JL_ALWAYS_LEAFTYPE = NULL;
if (ulong_array == NULL)
ulong_array = jl_apply_array_type((jl_value_t*)jl_ulong_type, 1);
jl_array_t *maxvalids = jl_alloc_array_1d(ulong_array, l);
memset(jl_array_data(maxvalids), 0, l * sizeof(size_t));
jl_value_t *loctag = NULL;
jl_value_t *matches = NULL;
jl_value_t *sig = NULL;
JL_GC_PUSH4(&maxvalids, &matches, &sig, &loctag);
for (i = 0; i < l; i++) {
jl_value_t *invokesig = jl_array_ptr_ref(targets, i * 3);
jl_value_t *callee = jl_array_ptr_ref(targets, i * 3 + 1);
jl_value_t *expected = jl_array_ptr_ref(targets, i * 3 + 2);
size_t min_valid = 0;
size_t max_valid = ~(size_t)0;
if (invokesig) {
assert(callee && "unsupported edge");
jl_methtable_t *mt = jl_method_get_table(((jl_method_instance_t*)callee)->def.method);
if ((jl_value_t*)mt == jl_nothing) {
max_valid = 0;
}
else {
matches = jl_gf_invoke_lookup_worlds(invokesig, (jl_value_t*)mt, minworld, &min_valid, &max_valid);
if (matches == jl_nothing) {
max_valid = 0;
}
else {
matches = (jl_value_t*)((jl_method_match_t*)matches)->method;
if (matches != expected) {
max_valid = 0;
}
}
}
}
else {
if (jl_is_method_instance(callee)) {
jl_method_instance_t *mi = (jl_method_instance_t*)callee;
sig = jl_type_intersection(mi->def.method->sig, (jl_value_t*)mi->specTypes);
}
else {
sig = callee;
}
assert(jl_is_array(expected));
int ambig = 0;
// TODO: possibly need to included ambiguities too (for the optimizer correctness)?
// len + 1 is to allow us to log causes of invalidation (SnoopCompile's @snoopr)
matches = jl_matching_methods((jl_tupletype_t*)sig, jl_nothing,
_jl_debug_method_invalidation ? INT32_MAX : jl_array_len(expected),
0, minworld, &min_valid, &max_valid, &ambig);
sig = NULL;
if (matches == jl_nothing) {
max_valid = 0;
}
else {
// setdiff!(matches, expected)
size_t j, k, ins = 0;
if (jl_array_len(matches) != jl_array_len(expected)) {
max_valid = 0;
}
for (k = 0; k < jl_array_len(matches); k++) {
jl_method_t *match = ((jl_method_match_t*)jl_array_ptr_ref(matches, k))->method;
size_t l = jl_array_len(expected);
for (j = 0; j < l; j++)
if (match == (jl_method_t*)jl_array_ptr_ref(expected, j))
break;
if (j == l) {
// intersection has a new method or a method was
// deleted--this is now probably no good, just invalidate
// everything about it now
max_valid = 0;
if (!_jl_debug_method_invalidation)
break;
jl_array_ptr_set(matches, ins++, match);
}
}
if (max_valid != ~(size_t)0 && _jl_debug_method_invalidation)
jl_array_del_end((jl_array_t*)matches, jl_array_len(matches) - ins);
}
}
((size_t*)(jl_array_data(maxvalids)))[i] = max_valid;
if (max_valid != ~(size_t)0 && _jl_debug_method_invalidation) {
jl_array_ptr_1d_push(_jl_debug_method_invalidation, invokesig ? (jl_value_t*)invokesig : callee);
loctag = jl_cstr_to_string("insert_backedges_callee");
jl_array_ptr_1d_push(_jl_debug_method_invalidation, loctag);
loctag = jl_box_int32((int32_t)i);
jl_array_ptr_1d_push(_jl_debug_method_invalidation, loctag);
jl_array_ptr_1d_push(_jl_debug_method_invalidation, matches);
}
//jl_static_show((JL_STREAM*)ios_stderr, (jl_value_t*)invokesig);
//jl_static_show((JL_STREAM*)ios_stderr, (jl_value_t*)callee);
//ios_puts(valid ? "valid\n" : "INVALID\n", ios_stderr);
}
JL_GC_POP();
return maxvalids;
}
// Combine all edges relevant to a method to initialize the maxvalids list
static jl_array_t *jl_verify_methods(jl_array_t *edges, jl_array_t *maxvalids)
{
JL_TIMING(VERIFY_IMAGE, VERIFY_Methods);
jl_value_t *loctag = NULL;
jl_array_t *maxvalids2 = NULL;
JL_GC_PUSH2(&loctag, &maxvalids2);
size_t i, l = jl_array_len(edges) / 2;
maxvalids2 = jl_alloc_array_1d(jl_typeof(maxvalids), l);
size_t *maxvalids2_data = (size_t*)jl_array_data(maxvalids2);
memset(maxvalids2_data, 0, l * sizeof(size_t));
for (i = 0; i < l; i++) {
jl_method_instance_t *caller = (jl_method_instance_t*)jl_array_ptr_ref(edges, 2 * i);
assert(jl_is_method_instance(caller) && jl_is_method(caller->def.method));
jl_array_t *callee_ids = (jl_array_t*)jl_array_ptr_ref(edges, 2 * i + 1);
assert(jl_typetagis((jl_value_t*)callee_ids, jl_array_int32_type));
if (callee_ids == NULL) {
// serializing the edges had failed
maxvalids2_data[i] = 0;
}
else {
int32_t *idxs = (int32_t*)jl_array_data(callee_ids);
size_t j;
maxvalids2_data[i] = ~(size_t)0;
for (j = 0; j < idxs[0]; j++) {
int32_t idx = idxs[j + 1];
size_t max_valid = ((size_t*)(jl_array_data(maxvalids)))[idx];
if (max_valid != ~(size_t)0 && _jl_debug_method_invalidation) {
jl_array_ptr_1d_push(_jl_debug_method_invalidation, (jl_value_t*)caller);
loctag = jl_cstr_to_string("verify_methods");
jl_array_ptr_1d_push(_jl_debug_method_invalidation, loctag);
loctag = jl_box_int32((int32_t)idx);
jl_array_ptr_1d_push(_jl_debug_method_invalidation, loctag);
}
if (max_valid < maxvalids2_data[i])
maxvalids2_data[i] = max_valid;
if (max_valid == 0)
break;
}
}
//jl_static_show((JL_STREAM*)ios_stderr, (jl_value_t*)caller);
//ios_puts(maxvalid2_data[i] == ~(size_t)0 ? "valid\n" : "INVALID\n", ios_stderr);
}
JL_GC_POP();
return maxvalids2;
}
// Visit the entire call graph, starting from edges[idx] to determine if that method is valid
// Implements Tarjan's SCC (strongly connected components) algorithm, simplified to remove the count variable
// and slightly modified with an early termination option once the computation reaches its minimum
static int jl_verify_graph_edge(size_t *maxvalids2_data, jl_array_t *edges, size_t idx, arraylist_t *visited, arraylist_t *stack)
{
if (maxvalids2_data[idx] == 0) {
visited->items[idx] = (void*)1;
return 0;
}
size_t cycle = (size_t)visited->items[idx];