hakorune/tools/hako_check/rules/rule_dead_methods.hako

using selfhost.shared.common.string_helpers as Str

static box RuleDeadMethodsBox {
  // IR expects: methods(Array<String>), calls(Array<Map{from,to}>), entrypoints(Array<String>)
  apply_ir(ir, path, out) {
    local methods = ir.get("methods"); if methods == null { return }
    local calls = ir.get("calls"); if calls == null { return }
    local eps = ir.get("entrypoints"); if eps == null { eps = new ArrayBox() }
    // build graph
    local adj = new MapBox()
    local i = 0; while i < methods.size() { adj.set(methods.get(i), new ArrayBox()); i = i + 1 }
    i = 0; while i < calls.size() { local c=calls.get(i); local f=c.get("from"); local t=c.get("to"); if adj.has(f)==1 { adj.get(f).push(t) }; i = i + 1 }
    // DFS from entrypoints
    local seen = new MapBox();
    local j = 0; while j < eps.size() { me._dfs(adj, eps.get(j), seen); j = j + 1 }
    // report dead = methods not seen
    i = 0; while i < methods.size() { local m=methods.get(i); if seen.has(m)==0 { out.push("[HC011] unreachable method (dead code): " + path + " :: " + m) }; i = i + 1 }
  }
  _dfs(adj, node, seen) {
    if node == null { return }
    if seen.has(node) == 1 { return }
    seen.set(node, 1)
    if adj.has(node) == 0 { return }
    local arr = adj.get(node)
    local k = 0; while k < arr.size() { me._dfs(adj, arr.get(k), seen); k = k + 1 }
  }
}

static box RuleDeadMethodsMain { method main(args) { return 0 } }