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[qfcc] Force live vars used by function statements 

This uses ud-chains for function statements (call/return) to force their
arguments to be live (in particular, indirect references via pointers)
this fixes the arraylife test.
This commit is contained in:
Bill Currie 2023-06-05 17:20:12 +09:00
parent fb1b3e0869
commit fe045f75fb
1 changed files with 13 additions and 2 deletions
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15
tools/qfcc/source/dags.c
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@ -196,7 +196,7 @@ operand_label (dag_t *dag, operand_t *op)
label->op = op;
op->label->daglabel = label;
} else {
internal_error (op->expr, "unexpected operand type: %d", op->op_type);
internal_error (op->expr, "unexpected operand type: %s", op_type_names[op->op_type]);
}
return label;
}
@ -483,7 +483,18 @@ dagnode_set_edges (dag_t *dag, dagnode_t *n, statement_t *s)
}
label->live = 1;
}
// ensure all operantions on global variables are completed before
for (int i = 0; i < s->num_use; i++) {
udchain_t ud = func->ud_chains[s->first_use + i];
flowvar_t *var = func->vars[ud.var];
if (var->op->op_type == op_pseudo) {
continue;
}
daglabel_t *l = operand_label (dag, var->op);
if (l) {
l->live = 1;
}
}
// ensure all operations on global variables are completed before
// the st_func statement executes
for (set_iter_t *g = set_first (func->global_vars); g;
g = set_next (g)) {