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#ifndef clox_value_h
#define clox_value_h
#include <string.h>
#include "common.h"
typedef struct Obj Obj;
typedef struct ObjString ObjString;
#ifdef NAN_BOXING
#define SIGN_BIT ((uint64_t)0x8000000000000000)
#define QNAN ((uint64_t)0x7ffc000000000000)
#define TAG_NIL 1 /* 01 */
#define TAG_FALSE 2 /* 10 */
#define TAG_TRUE 3 /* 11 */
typedef uint64_t Value;
#define IS_BOOL(value) (((value) | 1) == TRUE_VAL)
#define IS_NIL(value) ((value) == NIL_VAL)
#define IS_NUMBER(value) (((value)&QNAN) != QNAN)
#define IS_OBJ(value) (((value) & (QNAN | SIGN_BIT)) == (QNAN | SIGN_BIT))
#define AS_BOOL(value) ((value) == TRUE_VAL)
#define AS_NUMBER(value) valueToNum(value)
#define AS_OBJ(value) ((Obj *)(uintptr_t)((value) & ~(SIGN_BIT | QNAN)))
#define BOOL_VAL(b) ((b) ? TRUE_VAL : FALSE_VAL)
#define FALSE_VAL ((Value)(uint64_t)(QNAN | TAG_FALSE))
#define TRUE_VAL ((Value)(uint64_t)(QNAN | TAG_TRUE))
#define NIL_VAL ((Value)(uint64_t)(QNAN | TAG_NIL))
#define NUMBER_VAL(num) numToValue(num)
#define OBJ_VAL(obj) (Value)(SIGN_BIT | QNAN | (uint64_t)(uintptr_t)(obj))
static inline double valueToNum(Value value) {
double num;
memcpy(&num, &value, sizeof(Value));
return num;
}
static inline Value numToValue(double num) {
Value value;
memcpy(&value, &num, sizeof(double));
return value;
}
#else
typedef enum {
VAL_BOOL,
VAL_NIL,
VAL_NUMBER,
VAL_OBJ,
} ValueType;
typedef struct {
ValueType type;
union {
bool boolean;
double number;
Obj *obj;
} as;
} Value;
#define IS_BOOL(value) ((value).type == VAL_BOOL)
#define IS_NIL(value) ((value).type == VAL_NIL)
#define IS_NUMBER(value) ((value).type == VAL_NUMBER)
#define IS_OBJ(value) ((value).type == VAL_OBJ)
#define AS_OBJ(value) ((value).as.obj)
#define AS_BOOL(value) ((value).as.boolean)
#define AS_NUMBER(value) ((value).as.number)
#define BOOL_VAL(value) ((Value){VAL_BOOL, {.boolean = value}})
#define NIL_VAL ((Value){VAL_NIL, {.number = 0}})
#define NUMBER_VAL(value) ((Value){VAL_NUMBER, {.number = value}})
#define OBJ_VAL(value) ((Value){VAL_OBJ, {.obj = (Obj *)value}})
#endif // NAN_BOXING
typedef struct {
int capacity;
int count;
Value *values;
} ValueArray;
bool valuesEqual(Value a, Value b);
void initValueArray(ValueArray *array);
void writeValueArray(ValueArray *array, Value value);
void freeValueArray(ValueArray *array);
void printValue(Value value);
#endif
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