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test: 内联测试移入 oxide_dce 集成测试

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彭俊皓
2026-09-15 17:50:18 +00:00
parent f834c2dd9c
commit 263bdb5d27
4 changed files with 304 additions and 305 deletions
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crates/oxide_dce/src/lib.rs
-58
View File
@@ -56,61 +56,3 @@ pub fn dce_precise(f: &mut IRFunction, live: &LiveInfo) {
// mark-sweep 一次性重建
rebuild::pass_c_sweep(f, &keep);
}
#[cfg(test)]
mod tests {
use super::*;
use oxide_bytecode::opcode::OpCode;
use oxide_ir::inst::Inst;
use oxide_ir::operand::Operand;
/// 空函数退化：insts 空时 dce 直接返回，状态不变。
#[test]
fn empty_function_unchanged() {
let mut f = IRFunction::new();
dce(&mut f);
assert!(f.insts.is_empty());
assert!(f.label_pos.is_empty());
assert_eq!(f.label_count, 0);
}
/// 幂等性：dce 两次结果一致（不动点后无二次改写）。
#[test]
fn dce_is_idempotent() {
let mut f = IRFunction::new();
f.insts.push(Inst::load_const(Operand::Reg(1), 0)); // 0: 死
f.insts
.push(Inst::new(OpCode::ADD, Operand::Reg(2), Operand::Reg(1), Operand::Reg(1))); // 1: 死
f.insts.push(Inst::load_const(Operand::Reg(0), 1)); // 2: 存活（CALL 保活 r0）
f.insts.push(Inst::call(Operand::Reg(0), Operand::Reg(0), Operand::Reg(0), 0)); // 3
f.insts
.push(Inst::new(OpCode::RETURN, Operand::Reg(5), Operand::None, Operand::None)); // 4
f.label_pos = vec![Some(0)];
dce(&mut f);
let once_insts = f.insts.clone();
let once_labels = f.label_pos.clone();
dce(&mut f);
assert_eq!(f.insts, once_insts, "二次 dce 后 insts 不变");
assert_eq!(f.label_pos, once_labels, "二次 dce 后 label_pos 不变");
}
/// if/else 双分支完整链路：Jump + Fallthrough 双出边全可达，指令全保留，label 重映射正确。
#[test]
fn if_else_both_branches_reachable_kept() {
let mut f = IRFunction::new();
f.insts.push(Inst::jmp_if_false(0, 0)); // 0: cond → L0(else)
f.insts.push(Inst::call(Operand::Reg(2), Operand::Reg(0), Operand::Reg(3), 1)); // 1: then
f.insts.push(Inst::jmp(1)); // 2: → L1(end)
f.insts.push(Inst::call(Operand::Reg(4), Operand::Reg(0), Operand::Reg(3), 1)); // 3: else
f.insts
.push(Inst::new(OpCode::RETURN, Operand::Reg(5), Operand::None, Operand::None)); // 4
f.label_pos = vec![Some(3), Some(4)];
f.label_count = 2;
dce(&mut f);
assert_eq!(f.insts.len(), 5, "双分支全保留");
assert_eq!(f.label_pos, vec![Some(3), Some(4)], "存活 label 重映射到新下标");
assert_eq!(f.label_count, 2, "label_count 保持原值，不参与重建");
}
}
crates/oxide_dce/src/precise_sweep.rs
-247
View File
@@ -65,250 +65,3 @@ pub(super) fn pass_dead_with_liveness(f: &IRFunction, live: &LiveInfo, keep: &mu
}
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::dce_precise;
use oxide_ir::inst::Inst;
/// 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());
}
}