factor/vm/objects.cpp

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#include "master.hpp"
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namespace factor {
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void factor_vm::primitive_special_object() {
fixnum n = untag_fixnum(ctx->peek());
ctx->replace(special_objects[n]);
}
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void factor_vm::primitive_set_special_object() {
fixnum n = untag_fixnum(ctx->pop());
cell value = ctx->pop();
special_objects[n] = value;
}
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void factor_vm::primitive_identity_hashcode() {
cell tagged = ctx->peek();
object* obj = untag<object>(tagged);
ctx->replace(tag_fixnum(obj->hashcode()));
}
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void factor_vm::compute_identity_hashcode(object* obj) {
object_counter++;
if (object_counter == 0)
object_counter++;
obj->set_hashcode((cell)obj ^ object_counter);
}
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void factor_vm::primitive_compute_identity_hashcode() {
object* obj = untag<object>(ctx->pop());
compute_identity_hashcode(obj);
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}
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void factor_vm::primitive_set_slot() {
fixnum slot = untag_fixnum(ctx->pop());
object* obj = untag<object>(ctx->pop());
cell value = ctx->pop();
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cell* slot_ptr = &obj->slots()[slot];
*slot_ptr = value;
write_barrier(slot_ptr);
}
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/* Allocates memory */
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cell factor_vm::clone_object(cell obj_) {
data_root<object> obj(obj_, this);
if (immediate_p(obj.value()))
return obj.value();
else {
cell size = object_size(obj.value());
object* new_obj = allot_object(obj.type(), size);
memcpy(new_obj, obj.untagged(), size);
new_obj->set_hashcode(0);
return tag_dynamic(new_obj);
}
}
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/* Allocates memory */
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void factor_vm::primitive_clone() { ctx->replace(clone_object(ctx->peek())); }
/* Size of the object pointed to by a tagged pointer */
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cell factor_vm::object_size(cell tagged) {
if (immediate_p(tagged))
return 0;
else
return untag<object>(tagged)->size();
}
/* Allocates memory */
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void factor_vm::primitive_size() {
ctx->push(from_unsigned_cell(object_size(ctx->pop())));
}
struct slot_become_fixup : no_fixup {
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std::map<object*, object*>* become_map;
slot_become_fixup(std::map<object*, object*>* become_map)
: become_map(become_map) {}
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object* fixup_data(object* old) {
std::map<object*, object*>::const_iterator iter = become_map->find(old);
if (iter != become_map->end())
return iter->second;
else
return old;
}
};
struct object_become_visitor {
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slot_visitor<slot_become_fixup>* workhorse;
explicit object_become_visitor(slot_visitor<slot_become_fixup>* workhorse)
: workhorse(workhorse) {}
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void operator()(object* obj) { workhorse->visit_slots(obj); }
};
struct code_block_become_visitor {
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slot_visitor<slot_become_fixup>* workhorse;
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explicit code_block_become_visitor(
slot_visitor<slot_become_fixup>* workhorse)
: workhorse(workhorse) {}
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void operator()(code_block* compiled, cell size) {
workhorse->visit_code_block_objects(compiled);
workhorse->visit_embedded_literals(compiled);
}
};
struct code_block_write_barrier_visitor {
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code_heap* code;
explicit code_block_write_barrier_visitor(code_heap* code) : code(code) {}
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void operator()(code_block* compiled, cell size) {
code->write_barrier(compiled);
}
};
/* classes.tuple uses this to reshape tuples; tools.deploy.shaker uses this
to coalesce equal but distinct quotations and wrappers. */
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void factor_vm::primitive_become() {
array* new_objects = untag_check<array>(ctx->pop());
array* old_objects = untag_check<array>(ctx->pop());
cell capacity = array_capacity(new_objects);
if (capacity != array_capacity(old_objects))
critical_error("bad parameters to become", 0);
/* Build the forwarding map */
std::map<object*, object*> become_map;
for (cell i = 0; i < capacity; i++) {
tagged<object> old_obj(array_nth(old_objects, i));
tagged<object> new_obj(array_nth(new_objects, i));
if (old_obj != new_obj)
become_map[old_obj.untagged()] = new_obj.untagged();
}
/* Update all references to old objects to point to new objects */
{
slot_visitor<slot_become_fixup> workhorse(this,
slot_become_fixup(&become_map));
workhorse.visit_roots();
workhorse.visit_contexts();
object_become_visitor object_visitor(&workhorse);
each_object(object_visitor);
code_block_become_visitor code_block_visitor(&workhorse);
each_code_block(code_block_visitor);
}
/* Since we may have introduced old->new references, need to revisit
all objects and code blocks on a minor GC. */
data->mark_all_cards();
{
code_block_write_barrier_visitor code_block_visitor(code);
each_code_block(code_block_visitor);
}
}
}