// ir_core.h
#ifndef IR_CORE_H
#define IR_CORE_H

#include <lib/utils/ds/vector.h>

// 错误码定义
typedef enum {
    IR_EC_SUCCESS = 0,      // 成功
    IR_EC_MEMORY_ERROR,     // 内存分配失败
    IR_EC_TYPE_MISMATCH,    // 类型不匹配
    IR_EC_INVALID_OPERAND,  // 无效操作数
    IR_EC_DUPLICATE_SYMBOL, // 符号重定义
} ir_ecode_t;

typedef struct {
    enum {
        IR_TYPE_INT32,
        IR_TYPE_PTR,
        IR_TYPE_ARRAY,
        IR_TYPE_FUNC,
        IR_TYPE_VOID,
    } tag;
    union {
        struct {
            struct ir_type *base;
            rt_size_t len;
        } arr;
        struct {
            struct ir_type *ret;
            struct ir_type **params;
            rt_size_t param_cnt;
        } func;
    };
} ir_type_t;

typedef struct ir_node ir_node_t;

typedef struct ir_bblock {
    const char *label;
    vector_header(instrs, ir_node_t*);
    // ir_arr_t used_by;
} ir_bblock_t; // basic block

typedef struct {
    const char *name;
    ir_type_t *type;
    vector_header(params, ir_node_t*);
    vector_header(bblocks, ir_bblock_t*);
} ir_func_t;

typedef struct {
    vector_header(global, ir_node_t*);
    vector_header(funcs, ir_func_t*);
    vector_header(extern_funcs, ir_func_t*);
} ir_prog_t;

typedef enum ir_node_tag {
    IR_NODE_NULL,
    IR_NODE_CONST_INT,
    IR_NODE_ALLOC,
    IR_NODE_LOAD,
    IR_NODE_STORE,
    IR_NODE_GET_PTR,
    IR_NODE_OP,
    IR_NODE_BRANCH,
    IR_NODE_JUMP,
    IR_NODE_CALL,
    IR_NODE_RET,
} ir_node_tag_t;

struct ir_node {
    const ir_type_t* type;
    const char* name;
    vector_header(used_by, ir_node_t*);
    ir_node_tag_t tag;
    union {
        struct {
            int32_t val;
        } const_int;
        struct {
            ir_node_t* target;
        } load;
        struct {
            ir_node_t* target;
            ir_node_t* value;
        } store;
        struct {
            ir_node_t* src_addr;
            ir_node_t* offset;
        } get_ptr;
        struct {
            enum {
                /// Not equal to.
                IR_OP_NEQ,
                /// Equal to.
                IR_OP_EQ,
                /// Greater than.
                IR_OP_GT,
                /// Less than.
                IR_OP_LT,
                /// Greater than or equal to.
                IR_OP_GE,
                /// Less than or equal to.
                IR_OP_LE,
                /// Addition.
                IR_OP_ADD,
                /// Subtraction.
                IR_OP_SUB,
                /// Multiplication.
                IR_OP_MUL,
                /// Division.
                IR_OP_DIV,
                /// Modulo.
                IR_OP_MOD,
                /// Bitwise AND.
                IR_OP_AND,
                /// Bitwise OR.
                IR_OP_OR,
                /// Bitwise XOR.
                IR_OP_XOR,
                /// Bitwise NOT.
                IR_OP_NOT,
                /// Shift left logical.
                IR_OP_SHL,
                /// Shift right logical.
                IR_OP_SHR,
                /// Shift right arithmetic.
                IR_OP_SAR,
            } op;
            ir_node_t* lhs;
            ir_node_t* rhs;
        } op;
        struct {
            ir_node_t* cond;
            ir_bblock_t* true_bblock;
            ir_bblock_t* false_bblock;
        } branch;
        struct {
            ir_bblock_t* target_bblock;
        } jump;
        struct {
            ir_func_t* callee;
            vector_header(args, ir_node_t*);
        } call;
        struct {
            ir_node_t* ret_val;
        } ret;
    } data;
};

#endif // IR_CORE_H