#ifndef IR_H
#define IR_H

#include "arena.h"
#include "parse.h"
#include <stddef.h>
#include <stdint.h>

typedef uint32_t VReg;

#define IR_MAX_ARITY 8  // adjust as needed

typedef enum {
    OP_INT,
    OP_ADD,
    OP_SUB,
    OP_MUL
} OpCode;

typedef struct IrInst IrInst;

struct IrInst {
    OpCode op;
    VReg vreg;

    union {
        uint64_t value; // OP_INT

        struct {
            size_t operand_count;
            IrInst* operands[IR_MAX_ARITY]; // inline storage
        };
    };
};


typedef struct {
    Arena arena;
    VReg next_vreg;

    IrInst** insts;
    size_t count;
    size_t capacity;
} IrBlock;

void ir_block_init(IrBlock* block);
void ir_block_free(IrBlock* block);
void ir_block_print(IrBlock* block);

IrInst* ir_lower_expr(IrBlock* block, const Expr* expr);

void test_ast_lower(void);

#endif