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avoid inserting redundant stack sync events

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This commit is contained in:
Joel Dice 2008-04-19 20:05:17 -06:00
parent ddada5551d
commit 281bdb1fab
1 changed files with 13 additions and 5 deletions
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18
src/compiler.cpp
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@ -325,6 +325,8 @@ class Event {
virtual void compile(Context* c) = 0;
virtual bool needsStackSync() { return true; };
Event* next;
Stack* stack;
CodePromise* promises;
@ -379,7 +381,7 @@ clearSites(Context* c, Value* v)
void
nextRead(Context* c, Value* v)
{
// fprintf(stderr, "pop read %p from %p\n", v->reads, v);
// fprintf(stderr, "pop read %p from %p; next: %p\n", v->reads, v, v->reads->next);
v->reads = v->reads->next;
if (v->reads == 0) {
@ -1220,6 +1222,8 @@ class BranchEvent: public Event {
nextRead(c, address);
}
virtual bool needsStackSync() { return false; };
UnaryOperation type;
Value* address;
};
@ -1488,7 +1492,7 @@ class StackSyncEvent: public Event {
s->syncSite = stackSyncSite(c, i, s->size);
insertRead(c, this, previous, s->value, s->size * BytesPerWord,
s->syncSite);
s->pushEvent->active = false;
if (s->pushEvent) s->pushEvent->active = false;
i += s->size;
}
}
@ -1514,6 +1518,8 @@ class StackSyncEvent: public Event {
nextRead(c, r->value);
}
}
virtual bool needsStackSync() { return false; };
};
void
@ -1718,9 +1724,11 @@ updateJunctions(Context* c)
LogicalInstruction* p = c->logicalCode + ip;
if (p->lastEvent) {
// fprintf(stderr, "update junction at %d, predecessor %d\n", j->logicalIp, ip);
p->lastEvent = p->lastEvent->next
= new (c->zone->allocate(sizeof(StackSyncEvent)))
StackSyncEvent(c, p->lastEvent);
if (p->lastEvent->needsStackSync()) {
p->lastEvent = p->lastEvent->next
= new (c->zone->allocate(sizeof(StackSyncEvent)))
StackSyncEvent(c, p->lastEvent);
}
break;
}
}