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mysysy/src/include/backend/RISCv64/RISCv64ISel.h
lixuanwang dcf3d29ecc [deploy]O1
2025-08-20 15:59:22 +08:00

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#ifndef RISCV64_ISEL_H
#define RISCV64_ISEL_H
#include "RISCv64LLIR.h"
// Forward declarations
namespace sysy {
class GlobalValue;
class Value;
}
extern int DEBUG;
extern int DEEPDEBUG;
extern int optLevel;
namespace sysy {
class RISCv64ISel {
public:
RISCv64ISel();
// 模块主入口将一个高层IR函数转换为底层LLIR函数
std::unique_ptr<MachineFunction> runOnFunction(Function* func);
// 公开接口以便后续模块如RegAlloc可以查询或创建vreg
unsigned getVReg(Value* val);
unsigned getNewVReg(Type* type);
unsigned getVRegCounter() const;
// 获取 vreg_map 的公共接口
const std::map<Value*, unsigned>& getVRegMap() const { return vreg_map; }
const std::map<unsigned, Value*>& getVRegValueMap() const { return vreg_to_value_map; }
const std::map<unsigned, Type*>& getVRegTypeMap() const { return vreg_type_map; }
private:
// DAG节点定义作为ISel的内部实现细节
struct DAGNode;
// 指令选择主流程
void select();
// 为单个基本块生成指令
void selectBasicBlock(BasicBlock* bb);
// 核心函数为DAG节点选择并生成MachineInstr
void selectNode(DAGNode* node);
// DAG 构建相关函数 (从原RISCv64Backend迁移)
std::vector<std::unique_ptr<DAGNode>> build_dag(BasicBlock* bb);
DAGNode* get_operand_node(Value* val_ir, std::map<Value*, DAGNode*>&, std::vector<std::unique_ptr<DAGNode>>&);
DAGNode* create_node(int kind, Value* val, std::map<Value*, DAGNode*>&, std::vector<std::unique_ptr<DAGNode>>&);
// 用于计算类型大小的辅助函数
unsigned getTypeSizeInBytes(Type* type);
// 打印DAG图以供调试
void print_dag(const std::vector<std::unique_ptr<DAGNode>>& dag, const std::string& bb_name);
// 状态
Function* F; // 当前处理的高层IR函数
std::unique_ptr<MachineFunction> MFunc; // 正在构建的底层LLIR函数
MachineBasicBlock* CurMBB; // 当前正在处理的机器基本块
// 映射关系
std::map<Value*, unsigned> vreg_map;
std::map<unsigned, Value*> vreg_to_value_map;
std::map<unsigned, Type*> vreg_type_map;
std::map<const BasicBlock*, MachineBasicBlock*> bb_map;
unsigned vreg_counter;
int local_label_counter;
};
} // namespace sysy
#endif // RISCV64_ISEL_H