[backend]重构了后端

src/include/RISCv64Backend.h

@@ -1,130 +1,29 @@
 #ifndef RISCV64_BACKEND_H
 #define RISCV64_BACKEND_H
 
-#include "IR.h"
+#include "IR.h" // 只需包含高层IR定义
 #include <string>
 #include <vector>
-#include <map>
-#include <set>
 #include <memory>
-#include <iostream>
-#include <functional> // For std::function
-
-extern int DEBUG;
-extern int DEEPDEBUG;
-
-
 
 namespace sysy {
 
-// 为活跃性分析的结果定义一个结构体，以同时持有 live_in 和 live_out 集合
-struct LivenessResult {
-    std::map<Instruction*, std::set<std::string>> live_in;
-    std::map<Instruction*, std::set<std::string>> live_out;
-};
-
+// RISCv64CodeGen 现在是一个高层驱动器
 class RISCv64CodeGen {
 public:
-    enum class PhysicalReg {
-        ZERO, RA, SP, GP, TP, T0, T1, T2, S0, S1, A0, A1, A2, A3, A4, A5, A6, A7, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, T3, T4, T5, T6,
-        F0, F1, F2, F3, F4, F5, F6, F7, F8, F9, F10, F11, F12, F13, F14, F15,F16, F17, F18, F19, F20, F21, F22, F23, F24, F25, F26, F27, F28, F29, F30, F31
-    };
-
-    // Move DAGNode and RegAllocResult to public section
-    struct DAGNode {
-        enum NodeKind { CONSTANT, LOAD, STORE, BINARY, CALL, RETURN, BRANCH, ALLOCA_ADDR, UNARY, MEMSET };
-        NodeKind kind;
-        Value* value = nullptr; // For IR Value
-        std::string inst;       // Generated RISC-V instruction(s) for this node
-        std::string result_vreg; // Virtual register assigned to this node's result
-        std::vector<DAGNode*> operands;
-        std::vector<DAGNode*> users; // For debugging and potentially optimizations
-        DAGNode(NodeKind k) : kind(k) {}
-
-        // Debugging / helper
-        std::string getNodeKindString() const {
-            switch (kind) {
-                case CONSTANT: return "CONSTANT";
-                case LOAD: return "LOAD";
-                case STORE: return "STORE";
-                case BINARY: return "BINARY";
-                case CALL: return "CALL";
-                case RETURN: return "RETURN";
-                case BRANCH: return "BRANCH";
-                case ALLOCA_ADDR: return "ALLOCA_ADDR";
-                case UNARY: return "UNARY";
-                case MEMSET: return "MEMSET";
-                default: return "UNKNOWN";
-            }
-        }
-    };
-
-    struct RegAllocResult {
-        std::map<std::string, PhysicalReg> vreg_to_preg; // Virtual register to Physical Register mapping
-        std::map<Value*, int> stack_map; // Value (AllocaInst) to stack offset
-        int stack_size = 0; // Total stack frame size for locals and spills
-    };
-
     RISCv64CodeGen(Module* mod) : module(mod) {}
 
+    // 唯一的公共入口点
     std::string code_gen();
-    std::string module_gen();
-    std::string function_gen(Function* func);
-    // 修改 basicBlock_gen 的声明，添加 int block_idx 参数
-    std::string basicBlock_gen(BasicBlock* bb, const RegAllocResult& alloc, int block_idx);
-
-    // DAG related
-    std::vector<std::unique_ptr<DAGNode>> build_dag(BasicBlock* bb);
-    void select_instructions(DAGNode* node, const RegAllocResult& alloc);
-    // 改变 emit_instructions 的参数，使其可以直接添加汇编指令到 main ss
-    void emit_instructions(DAGNode* node, std::stringstream& ss, const RegAllocResult& alloc, std::set<DAGNode*>& emitted_nodes);
-
-    // Register Allocation related
-    LivenessResult liveness_analysis(Function* func);
-    std::map<std::string, std::set<std::string>> build_interference_graph(const LivenessResult& liveness);
-    void color_graph(std::map<std::string, PhysicalReg>& vreg_to_preg,
-                     const std::map<std::string, std::set<std::string>>& interference_graph);
-    RegAllocResult register_allocation(Function* func);
-    void eliminate_phi(Function* func); // Phi elimination is typically done before DAG building
-
-    // Utility
-    std::string reg_to_string(PhysicalReg reg);
-    void print_dag(const std::vector<std::unique_ptr<DAGNode>>& dag, const std::string& bb_name);
 
 private:
-    static const std::vector<PhysicalReg> allocable_regs;
-    std::map<Value*, std::string> value_vreg_map; // Maps IR Value* to its virtual register name
+    // 模块级代码生成 (处理全局变量和驱动函数生成)
+    std::string module_gen();
+    
+    // 函数级代码生成 (实现新的流水线)
+    std::string function_gen(Function* func);
+
     Module* module;
-    int vreg_counter = 0; // Counter for unique virtual register names
-    int alloca_offset_counter = 0; // Counter for alloca offsets
-
-    // 新增一个成员变量来存储当前函数的所有 DAGNode，以确保其生命周期贯穿整个函数代码生成
-    // 这样可以在多个 BasicBlock_gen 调用中访问到完整的 DAG 节点
-    std::vector<std::unique_ptr<DAGNode>> current_function_dag_nodes;
-
-    // 为空标签定义一个伪名称前缀，加上块索引以确保唯一性
-    const std::string ENTRY_BLOCK_PSEUDO_NAME = "entry_block_";
-    
-    int local_label_counter = 0; // 用于生成唯一的本地标签 (如 memset 循环, 匿名块跳转等)
-    
-    // !!! 修改：get_operand_node 辅助函数现在需要传入 value_to_node 和 nodes_storage 的引用
-    // 因为它们是 build_dag 局部管理的
-    DAGNode* get_operand_node(
-        Value* val_ir,
-        std::map<Value*, DAGNode*>& value_to_node,
-        std::vector<std::unique_ptr<DAGNode>>& nodes_storage
-    );
-
-    // !!! 新增：create_node 辅助函数也需要传入 value_to_node 和 nodes_storage 的引用
-    // 并且它应该不再是 lambda，而是一个真正的成员函数
-    DAGNode* create_node(
-        DAGNode::NodeKind kind,
-        Value* val,
-        std::map<Value*, DAGNode*>& value_to_node,
-        std::vector<std::unique_ptr<DAGNode>>& nodes_storage
-    );
-
-    std::vector<std::unique_ptr<Instruction>> temp_instructions_storage; // 用于存储 build_dag 中创建的临时 BinaryInst
 };
 
 } // namespace sysy