[midend]重构了src目录

src/include/midend/Pass/Optimize/SysYIRCFGOpt.h

@@ -0,0 +1,101 @@
+#pragma once
+
+#include "IR.h"
+#include "IRBuilder.h"
+#include "Pass.h"
+
+namespace sysy {
+
+// 优化前对SysY IR的预处理，也可以视作部分CFG优化
+// 主要包括删除无用指令、合并基本块、删除空块等
+// 这些操作可以在SysY IR生成时就完成，但为了简化IR生成过程，
+// 这里将其放在SysY IR生成后进行预处理
+// 同时兼容phi节点的处理，可以再mem2reg后再次调用优化
+
+//TODO: 可增加的CFG优化和方法
+// - 检查基本块跳转关系正确性
+// - 简化条件分支（Branch Simplification），如条件恒真/恒假转为直接跳转
+// - 合并连续的跳转指令（Jump Threading）在合并不可达块中似乎已经实现了
+// - 基本块重排序（Block Reordering），提升局部性
+
+// 辅助工具类，包含实际的CFG优化逻辑
+// 这些方法可以被独立的Pass调用
+class SysYCFGOptUtils {
+public:
+  static bool SysYDelInstAfterBr(Function *func); // 删除br后面的指令
+  static bool SysYDelEmptyBlock(Function *func, IRBuilder* pBuilder); // 空块删除
+  static bool SysYDelNoPreBLock(Function *func); // 删除无前驱块（不可达块）
+  static bool SysYBlockMerge(Function *func);    // 合并基本块
+  static bool SysYAddReturn(Function *func, IRBuilder* pBuilder);     // 添加return指令
+  static bool SysYCondBr2Br(Function *func, IRBuilder* pBuilder);  // 条件分支转换为无条件分支
+};
+
+// ======================================================================
+// 独立的CFG优化遍
+// ======================================================================
+
+class SysYDelInstAfterBrPass : public OptimizationPass {
+public:
+  static void *ID; // 唯一ID
+  SysYDelInstAfterBrPass() : OptimizationPass("SysYDelInstAfterBrPass", Granularity::Function) {}
+  bool runOnFunction(Function *F, AnalysisManager& AM) override;
+  void getAnalysisUsage(std::set<void *> &analysisDependencies, std::set<void *> &analysisInvalidations) const override {
+    // 这个优化可能改变CFG结构，使一些CFG相关的分析失效
+    // 可以在这里指定哪些分析会失效，例如支配树、活跃变量等
+    // analysisInvalidations.insert(DominatorTreeAnalysisPass::ID); // 示例
+  }
+  void *getPassID() const override { return &ID; }
+};
+
+class SysYDelEmptyBlockPass : public OptimizationPass {
+private:
+  IRBuilder *pBuilder;
+public:
+  static void *ID;
+  SysYDelEmptyBlockPass(IRBuilder *builder) : OptimizationPass("SysYDelEmptyBlockPass", Granularity::Function), pBuilder(builder) {}
+  bool runOnFunction(Function *F, AnalysisManager& AM) override;
+  void getAnalysisUsage(std::set<void *> &analysisDependencies, std::set<void *> &analysisInvalidations) const override {};
+  void *getPassID() const override { return &ID; }
+};
+
+class SysYDelNoPreBLockPass : public OptimizationPass {
+public:
+  static void *ID;
+  SysYDelNoPreBLockPass() : OptimizationPass("SysYDelNoPreBLockPass", Granularity::Function) {}
+  bool runOnFunction(Function *F, AnalysisManager& AM) override;
+  void getAnalysisUsage(std::set<void *> &analysisDependencies, std::set<void *> &analysisInvalidations) const override {};
+  void *getPassID() const override { return &ID; }
+};
+
+class SysYBlockMergePass : public OptimizationPass {
+public:
+  static void *ID;
+  SysYBlockMergePass() : OptimizationPass("SysYBlockMergePass", Granularity::Function) {}
+  bool runOnFunction(Function *F, AnalysisManager& AM) override;
+  void getAnalysisUsage(std::set<void *> &analysisDependencies, std::set<void *> &analysisInvalidations) const override {};
+  void *getPassID() const override { return &ID; }
+};
+
+class SysYAddReturnPass : public OptimizationPass {
+private:
+  IRBuilder *pBuilder;
+public:
+  static void *ID;
+  SysYAddReturnPass(IRBuilder *builder) : OptimizationPass("SysYAddReturnPass", Granularity::Function), pBuilder(builder) {}
+  bool runOnFunction(Function *F, AnalysisManager& AM) override;
+  void getAnalysisUsage(std::set<void *> &analysisDependencies, std::set<void *> &analysisInvalidations) const override {};
+  void *getPassID() const override { return &ID; }
+};
+
+class SysYCondBr2BrPass : public OptimizationPass {
+private:
+  IRBuilder *pBuilder;
+public:
+  static void *ID;
+  SysYCondBr2BrPass(IRBuilder *builder) : OptimizationPass("SysYCondBr2BrPass", Granularity::Function), pBuilder(builder) {}
+  bool runOnFunction(Function *F, AnalysisManager& AM) override;
+  void getAnalysisUsage(std::set<void *> &analysisDependencies, std::set<void *> &analysisInvalidations) const override {};
+  void *getPassID() const override { return &ID; }
+};
+
+}  // namespace sysy