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Add GC support

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This commit is contained in:
ridethepig 2023-04-01 16:51:03 +08:00
parent fec2e03a75
commit 2644480b9e
2 changed files with 17 additions and 4 deletions
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19
assignments/PA5/cgen.cc
View File

@ -356,6 +356,11 @@ static void emit_gc_check(char *source, ostream &s) {
s << JAL << "_gc_check" << endl;
}
static void emit_gc_assign(int offset, ostream &s) {
emit_addiu(A1, SELF, offset * WORD_SIZE, s);
emit_gc_assign(s);
}
/*
| ........ |
|------------|
@ -737,7 +742,7 @@ void CgenClassTable::gen_init_code() {
for (auto i = 0U; i < attrs->size(); ++i) {
auto attr_pair = (*attrs)[i];
loctab.add(LocationTableItem(attr_pair.second->name, Attribute,
i + DEFAULT_OBJFIELDS));
i + DEFAULT_OBJFIELDS));
}
for (auto i = 0U; i < attrs->size(); ++i) {
auto attr_pair = (*attrs)[i];
@ -754,9 +759,11 @@ void CgenClassTable::gen_init_code() {
this->expr_type_decl = attr_pair.second->type_decl;
attr_pair.second->init->code(str, this);
emit_store(ACC, i + DEFAULT_OBJFIELDS, SELF, str);
if (cgen_Memmgr != GC_NOGC)
emit_gc_assign(i + DEFAULT_OBJFIELDS, str);
}
loctab.exitscope();
emit_move(ACC, SELF, str);
emit_move(ACC, SELF, str);
// remember to place the initialized object back to $a0, other code rely on
// this behavior
emit_procedure_footer(0, str);
@ -1240,8 +1247,11 @@ void assign_class::code(ostream &s, CgenClassTable *classtab) {
emit_store(ACC, loc->offset, FP, s);
} else {
emit_store(ACC, loc->offset, SELF, s);
if (cgen_Memmgr != GC_NOGC)
emit_gc_assign(loc->offset, s);
}
}
/*
static dispatch is a little bit simpler than normal dispatch
Intuitively, first evaluate all the parameter expression and push stack. Note
@ -1262,7 +1272,7 @@ void static_dispatch_class::code(ostream &s, CgenClassTable *classtab) {
auto actual_expr = this->actual->nth(actual_i);
actual_expr->code(s, classtab);
emit_push(ACC, s); // push param to stack
++ nparams;
++nparams;
}
this->expr->code(s, classtab);
auto label_dispatch = classtab->alloc_label_index();
@ -1301,7 +1311,7 @@ void dispatch_class::code(ostream &s, CgenClassTable *classtab) {
auto actual_expr = this->actual->nth(actual_i);
actual_expr->code(s, classtab);
emit_push(ACC, s); // push param to stack
++ nparams;
++nparams;
}
this->expr->code(s, classtab);
auto label_dispatch = classtab->alloc_label_index();
@ -1332,6 +1342,7 @@ void dispatch_class::code(ostream &s, CgenClassTable *classtab) {
// call the method whose address is in $t1, with self object in $a0
emit_jalr(T1, s);
rel_stack_depth -= nparams;
// caller doesn't pop the params, so we need to manual set the stack depth
}
/*

2
assignments/PA5/example.cl
View File

@ -37,8 +37,10 @@ class C inherits A {
method_3(x1: Int, x2: A, x3: String) : Object {
{
x1 <- x1 + 00010 - x1 / 10;
attr_C_1 <- x3;
x2 <- x2.method_common(x1);
x3 <- x3.concat("schade");
attr_C_0 <- x1;
}
};
method_2(x1: Bool, x2: C) : Object {