test: 内联测试移入 oxide_dce 集成测试

2026-10-23 18:21:13 +08:00 · 2026-09-15 17:50:18 +00:00
parent f834c2dd9c
commit 263bdb5d27
4 changed files with 304 additions and 305 deletions
@@ -0,0 +1,247 @@
+//! 精确轮单元断言：寄存器复用死写、STORE_VAR 特例、label 目标、收敛行为。
+
+use oxide_dce::dce_precise;
+use oxide_ir::inst::Inst;
+use oxide_ir::operand::Operand;
+use oxide_ir::IRFunction;
+use oxide_liveness::LiveInfo;
+
+/// helper：稀疏号集 → u64 位集 live_after。
+fn live_sets(after: &[&[u32]], reg_count: usize) -> Vec<Vec<u64>> {
+    let words = (reg_count + 1).div_ceil(64);
+    after
+        .iter()
+        .map(|set| {
+            let mut v = vec![0u64; words];
+            for &r in *set {
+                v[(r as usize) >> 6] |= 1u64 << ((r as usize) & 63);
+            }
+            v
+        })
+        .collect()
+}
+
+fn run_precise(f: &mut IRFunction, after: &[&[u32]], reg_count: usize) {
+    let mut live = LiveInfo::new();
+    live.inst_live_after = live_sets(after, reg_count);
+    dce_precise(f, &live);
+}
+
+/// 精确轮标志性测试：寄存器复用后被后写杀死的死写（保守 use 计数抓不到）。
+#[test]
+fn reuse_killed_dead_write_deleted() {
+    let mut f = IRFunction::new();
+    f.insts.push(Inst::new(
+        oxide_bytecode::opcode::OpCode::ADD,
+        Operand::Reg(5),
+        Operand::Reg(1),
+        Operand::Reg(2),
+    ));
+    f.insts.push(Inst::new(
+        oxide_bytecode::opcode::OpCode::ADD,
+        Operand::Reg(5),
+        Operand::Reg(3),
+        Operand::Reg(4),
+    ));
+    f.insts.push(Inst::new(
+        oxide_bytecode::opcode::OpCode::RETURN,
+        Operand::Reg(5),
+        Operand::None,
+        Operand::None,
+    ));
+    // inst_live_after = [{3,4}, {5}, {}]：inst0 def 5 在 live_after[0] 无 5（后写杀死）
+    run_precise(&mut f, &[&[3, 4], &[5], &[]], 5);
+    assert_eq!(f.insts.len(), 2, "死写（前一个 ADD）应被删");
+}
+
+/// 局部死 STORE_VAR 删除（四条件全满足）。
+#[test]
+fn local_dead_store_var_deleted() {
+    let mut f = IRFunction::new();
+    f.insts.push(Inst::load_const(Operand::Reg(1), 0));
+    f.insts.push(Inst::new(
+        oxide_bytecode::opcode::OpCode::STORE_VAR,
+        Operand::Reg(2),
+        Operand::Reg(1),
+        Operand::Imm(0),
+    ));
+    f.insts.push(Inst::new(
+        oxide_bytecode::opcode::OpCode::RETURN,
+        Operand::Reg(5),
+        Operand::None,
+        Operand::None,
+    ));
+    // is_top_level 默认 false；inst_live_after = [{1,5}, {5}, {}]
+    run_precise(&mut f, &[&[1, 5], &[5], &[]], 5);
+    assert_eq!(f.insts.len(), 2, "局部死 STORE_VAR 应被删（LOAD_CONST 单遍不级联保留）");
+}
+
+/// 顶层 STORE_VAR 永不删（顶层赋值全局可观察）。
+#[test]
+fn top_level_store_var_kept() {
+    let mut f = IRFunction::new();
+    f.is_top_level = true;
+    f.insts.push(Inst::load_const(Operand::Reg(1), 0));
+    f.insts.push(Inst::new(
+        oxide_bytecode::opcode::OpCode::STORE_VAR,
+        Operand::Reg(2),
+        Operand::Reg(1),
+        Operand::Imm(0),
+    ));
+    f.insts.push(Inst::new(
+        oxide_bytecode::opcode::OpCode::RETURN,
+        Operand::Reg(5),
+        Operand::None,
+        Operand::None,
+    ));
+    run_precise(&mut f, &[&[1, 5], &[5], &[]], 5);
+    assert_eq!(f.insts.len(), 3, "顶层 STORE_VAR 不可删");
+}
+
+/// escaped 槽 STORE_VAR 永不删（nested 直读）。
+#[test]
+fn escaped_slot_store_var_kept() {
+    let mut f = IRFunction::new();
+    f.insts.push(Inst::load_const(Operand::Reg(1), 0));
+    f.insts.push(Inst::new(
+        oxide_bytecode::opcode::OpCode::STORE_VAR,
+        Operand::Reg(2),
+        Operand::Reg(1),
+        Operand::Imm(0),
+    ));
+    f.insts.push(Inst::new(
+        oxide_bytecode::opcode::OpCode::RETURN,
+        Operand::Reg(5),
+        Operand::None,
+        Operand::None,
+    ));
+    let mut sub = IRFunction::new();
+    sub.insts.push(Inst::new(
+        oxide_bytecode::opcode::OpCode::LOAD_VAR,
+        Operand::Reg(5),
+        Operand::Reg(2),
+        Operand::None,
+    ));
+    f.nested.push(sub);
+    run_precise(&mut f, &[&[1, 5], &[5], &[]], 5);
+    assert_eq!(f.insts.len(), 3, "被嵌套函数直引的 escaped 槽 STORE_VAR 不可删");
+}
+
+/// const 赋值路径 b=1 保留（运行时抛 TypeError 可观察）。
+#[test]
+fn const_guard_store_var_kept() {
+    let mut f = IRFunction::new();
+    f.insts.push(Inst::load_const(Operand::Reg(1), 0));
+    f.insts.push(Inst::new(
+        oxide_bytecode::opcode::OpCode::STORE_VAR,
+        Operand::Reg(2),
+        Operand::Reg(1),
+        Operand::Imm(1),
+    ));
+    f.insts.push(Inst::new(
+        oxide_bytecode::opcode::OpCode::RETURN,
+        Operand::Reg(5),
+        Operand::None,
+        Operand::None,
+    ));
+    run_precise(&mut f, &[&[1, 5], &[5], &[]], 5);
+    assert_eq!(f.insts.len(), 3, "b=1 const 赋值路径不可删");
+}
+
+/// label 目标指令永不删。
+#[test]
+fn label_target_inst_never_deleted() {
+    let mut f = IRFunction::new();
+    f.insts.push(Inst::load_const(Operand::Reg(1), 0)); // label 0 目标，纯且结果未用
+    f.insts.push(Inst::new(
+        oxide_bytecode::opcode::OpCode::RETURN,
+        Operand::Reg(5),
+        Operand::None,
+        Operand::None,
+    ));
+    f.label_pos = vec![Some(0)];
+    run_precise(&mut f, &[&[5], &[]], 5);
+    assert_eq!(f.insts.len(), 2, "label 目标指令不可删");
+}
+
+/// SPILL/UNSPILL 永不删（is_pure=false）；活 MOV 保留。
+#[test]
+fn spill_unspill_never_deleted_mov_kept_when_live() {
+    let mut f = IRFunction::new();
+    f.insts.push(Inst::inst_spill(Operand::Reg(1), 0));
+    f.insts.push(Inst::inst_unspill(Operand::Reg(2), 0));
+    f.insts.push(Inst::inst_mov(Operand::Reg(3), Operand::Reg(2)));
+    f.insts.push(Inst::new(
+        oxide_bytecode::opcode::OpCode::RETURN,
+        Operand::Reg(3),
+        Operand::None,
+        Operand::None,
+    ));
+    run_precise(&mut f, &[&[], &[2], &[3], &[]], 5);
+    assert_eq!(f.insts.len(), 4, "SPILL/UNSPILL 永不删，活 MOV 保留");
+}
+
+/// 过期 LiveInfo 维度守卫：直接 return 零删除。
+#[test]
+fn stale_liveinfo_no_op() {
+    let mut f = IRFunction::new();
+    f.insts.push(Inst::load_const(Operand::Reg(1), 0));
+    f.insts.push(Inst::new(
+        oxide_bytecode::opcode::OpCode::STORE_VAR,
+        Operand::Reg(2),
+        Operand::Reg(1),
+        Operand::Imm(0),
+    ));
+    f.insts.push(Inst::new(
+        oxide_bytecode::opcode::OpCode::RETURN,
+        Operand::Reg(5),
+        Operand::None,
+        Operand::None,
+    ));
+    let live = LiveInfo::new(); // 空 LiveInfo：维度不符
+    dce_precise(&mut f, &live);
+    assert_eq!(f.insts.len(), 3, "过期 LiveInfo 不得删除任何指令");
+}
+
+/// 收敛性：单遍不级联设计下，重复跑会逐轮收敛（删 STORE_VAR 后其源 LOAD_CONST 变死），
+/// 收敛到不动点后不再改变。
+#[test]
+fn dce_precise_converges() {
+    let mut f = IRFunction::new();
+    f.insts.push(Inst::load_const(Operand::Reg(1), 0));
+    f.insts.push(Inst::new(
+        oxide_bytecode::opcode::OpCode::STORE_VAR,
+        Operand::Reg(2),
+        Operand::Reg(1),
+        Operand::Imm(0),
+    ));
+    f.insts.push(Inst::new(
+        oxide_bytecode::opcode::OpCode::RETURN,
+        Operand::Reg(5),
+        Operand::None,
+        Operand::None,
+    ));
+    // 第一遍：手填 live（STORE_VAR 死）
+    run_precise(&mut f, &[&[1, 5], &[5], &[]], 5);
+    assert_eq!(f.insts.len(), 2, "第一遍删 STORE_VAR");
+    // 第二遍：重算 live → LOAD_CONST 变死
+    let cfg = oxide_cfg::build_cfg(&f);
+    let live = oxide_liveness::liveness(&f, &cfg);
+    dce_precise(&mut f, &live);
+    assert_eq!(f.insts.len(), 1, "第二遍删 LOAD_CONST（级联收敛）");
+    let after2 = f.insts.clone();
+    // 第三遍：不动点，不再改变
+    let cfg = oxide_cfg::build_cfg(&f);
+    let live = oxide_liveness::liveness(&f, &cfg);
+    dce_precise(&mut f, &live);
+    assert_eq!(f.insts, after2, "第三遍不再删除（收敛）");
+}
+
+/// 空函数退化。
+#[test]
+fn empty_function_unchanged() {
+    let mut f = IRFunction::new();
+    let live = LiveInfo::new();
+    dce_precise(&mut f, &live);
+    assert!(f.insts.is_empty());
+}