[midend]优化中端框架，移除无用旧代码，ignore格式文件

src/Pass.cpp

@@ -0,0 +1,132 @@
+// Pass.cpp
+#include "Pass.h"
+#include "SysYIRCFGOpt.h"
+#include "SysYIRPrinter.h"
+#include <iostream>
+#include <queue>
+#include <map>
+#include <set>
+#include <algorithm>
+#include <vector>
+#include "Dom.h"
+#include "Liveness.h"
+
+namespace sysy {
+
+extern int DEBUG; // 全局调试标志
+
+// ======================================================================
+// 封装优化流程的函数：包含Pass注册和迭代运行逻辑
+// ======================================================================
+
+void PassManager::runOptimizationPipeline(Module* moduleIR, int optLevel) {
+    if (DEBUG) std::cout << "--- Starting Middle-End Optimizations (Level -O" << optLevel << ") ---\n";
+
+    // 1. 注册所有可用的分析遍和优化遍
+    // 这些注册只需执行一次。
+    sysy::registerAnalysisPass<sysy::DominatorTreeAnalysisPass>();
+    sysy::registerAnalysisPass<sysy::LivenessAnalysisPass>();
+
+
+    // 2. 创建遍管理器
+    sysy::PassManager pm(moduleIR);
+
+    // 3. 根据优化级别添加不同的优化遍
+    if (optLevel >= 1) {
+        if (DEBUG) std::cout << "Applying -O1 optimizations.\n";
+
+        // 4. 循环执行遍，直到 IR 稳定 (不再有任何遍修改 IR)
+        bool changed_in_iteration = true;
+        int iteration_count = 0;
+        while(changed_in_iteration) {
+            iteration_count++;
+            if (DEBUG) std::cout << "Optimization iteration: " << iteration_count << std::endl;
+            changed_in_iteration = pm.run(); // 运行一次所有添加到 PassManager 的遍
+            if (DEBUG && changed_in_iteration) {
+              std::cout << "=== IR after iteration " << iteration_count << " ===\n";
+              SysYPrinter printer_iter(moduleIR);
+              printer_iter.printIR();
+            }
+        }
+        if (DEBUG) std::cout << "Optimizations stabilized after " << iteration_count << " iterations.\n";
+    }
+
+
+    if (DEBUG) {
+      std::cout << "=== Final IR After Middle-End Optimizations (Level -O" << optLevel << ") ===\n";
+      SysYPrinter printer(moduleIR);
+      printer.printIR();
+    }
+}
+
+void PassManager::addPass(void *passID) {
+
+  PassRegistry &registry = PassRegistry::getPassRegistry();
+  std::unique_ptr<Pass> P = registry.createPass(passID);
+  if (!P) {
+    // Error: Pass not found or failed to create
+    return;
+  }
+
+  passes.push_back(std::move(P));
+}
+
+// 运行所有注册的遍
+bool PassManager::run() {
+  bool changed = false;
+  for (const auto &p : passes) {
+    bool passChanged = false; // 记录当前遍是否修改了 IR
+
+    // 处理优化遍的分析依赖和失效
+    if (p->getPassKind() == Pass::PassKind::Optimization) {
+      OptimizationPass *optPass = static_cast<OptimizationPass *>(p.get());
+      std::set<void *> analysisDependencies;
+      std::set<void *> analysisInvalidations;
+      optPass->getAnalysisUsage(analysisDependencies, analysisInvalidations);
+
+      // PassManager 不显式运行分析依赖。
+      // 而是优化遍在 runOnFunction 内部通过 AnalysisManager.getAnalysisResult 按需请求。
+    }
+
+    if (p->getGranularity() == Pass::Granularity::Module) {
+      passChanged = p->runOnModule(pmodule, analysisManager);
+    } else if (p->getGranularity() == Pass::Granularity::Function) {
+      for (auto &funcPair : pmodule->getFunctions()) {
+        Function *F = funcPair.second.get();
+        passChanged = p->runOnFunction(F, analysisManager) || passChanged;
+
+        if (passChanged && p->getPassKind() == Pass::PassKind::Optimization) {
+          OptimizationPass *optPass = static_cast<OptimizationPass *>(p.get());
+          std::set<void *> analysisDependencies;
+          std::set<void *> analysisInvalidations;
+          optPass->getAnalysisUsage(analysisDependencies, analysisInvalidations);
+          for (void *invalidationID : analysisInvalidations) {
+            analysisManager.invalidateAnalysis(invalidationID, F);
+          }
+        }
+      }
+    } else if (p->getGranularity() == Pass::Granularity::BasicBlock) {
+      for (auto &funcPair : pmodule->getFunctions()) {
+        Function *F = funcPair.second.get();
+        for (auto &bbPtr : funcPair.second->getBasicBlocks()) {
+          passChanged = p->runOnBasicBlock(bbPtr.get(), analysisManager) || passChanged;
+
+          if (passChanged && p->getPassKind() == Pass::PassKind::Optimization) {
+            OptimizationPass *optPass = static_cast<OptimizationPass *>(p.get());
+            std::set<void *> analysisDependencies;
+            std::set<void *> analysisInvalidations;
+            optPass->getAnalysisUsage(analysisDependencies, analysisInvalidations);
+            for (void *invalidationID : analysisInvalidations) {
+              analysisManager.invalidateAnalysis(invalidationID, F);
+            }
+          }
+        }
+      }
+    }
+    changed = changed || passChanged;
+  }
+  return changed;
+
+}
+
+} // namespace sysy