mirror of https://github.com/CPunch/Cosmo.git
119 lines
3.7 KiB
C
119 lines
3.7 KiB
C
#ifndef CVALUE_H
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#define CVALUE_H
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#include "cosmo.h"
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typedef enum {
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COSMO_TNUMBER, // number has to be 0 because NaN box
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COSMO_TBOOLEAN,
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COSMO_TOBJ,
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COSMO_TNIL,
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} CosmoType;
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typedef double cosmo_Number;
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/*
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holds primitive cosmo types
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*/
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#ifdef NAN_BOXXED
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/*
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NaN box, this is great for performance on x86_64 or ARM64 architectures. If you don't know how this works please reference these
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two articles:
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https://leonardschuetz.ch/blog/nan-boxing/ and https://piotrduperas.com/posts/nan-boxing/
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both are great resources :)
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TL;DR: we can store payloads in the NaN value in the IEEE 754 standard.
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*/
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typedef union CValue {
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uint64_t data;
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cosmo_Number num;
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} CValue;
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#define MASK_TYPE ((uint64_t)0x7)
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#define MASK_PAYLOAD ((uint64_t)0x0007fffffffffff8)
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// 3 bits (low bits) are reserved for the type
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#define MAKE_PAYLOAD(x) (((uint64_t)(x) << 3) & MASK_PAYLOAD)
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#define READ_PAYLOAD(x) (((x).data & MASK_PAYLOAD) >> 3)
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// The bits that must be set to indicate a quiet NaN.
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#define MASK_QUIETNAN ((uint64_t)0x7ff8000000000000)
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#define GET_TYPE(x) \
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((((x).data & MASK_QUIETNAN) == MASK_QUIETNAN) ? ((x).data & MASK_TYPE) : COSMO_TNUMBER)
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#define SIG_MASK (MASK_QUIETNAN | MASK_TYPE)
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#define BOOL_SIG (MASK_QUIETNAN | COSMO_TBOOLEAN)
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#define OBJ_SIG (MASK_QUIETNAN | COSMO_TOBJ)
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#define NIL_SIG (MASK_QUIETNAN | COSMO_TNIL)
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#define cosmoV_newNumber(x) ((CValue){.num = x})
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#define cosmoV_newObj(x) ((CValue){.data = MASK_QUIETNAN | MAKE_PAYLOAD((uintptr_t)x) | COSMO_TOBJ})
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#define cosmoV_newBoolean(x) ((CValue){.data = MASK_QUIETNAN | MAKE_PAYLOAD(x) | COSMO_TBOOLEAN})
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#define cosmoV_newNil() ((CValue){.data = MASK_QUIETNAN | COSMO_TNIL})
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#define cosmoV_readNumber(x) ((x).num)
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#define cosmoV_readBoolean(x) ((bool)READ_PAYLOAD(x))
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#define cosmoV_readObj(x) ((CObj*)READ_PAYLOAD(x))
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#define IS_NUMBER(x) (((x).data & MASK_QUIETNAN) != MASK_QUIETNAN)
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#define IS_BOOLEAN(x) (((x).data & SIG_MASK) == BOOL_SIG)
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#define IS_NIL(x) (((x).data & SIG_MASK) == NIL_SIG)
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#define IS_OBJ(x) (((x).data & SIG_MASK) == OBJ_SIG)
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#else
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/*
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Tagged union, this is the best platform independent solution
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*/
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typedef struct CValue {
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CosmoType type;
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union {
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cosmo_Number num;
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bool b; // boolean
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CObj *obj;
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} val;
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} CValue;
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#define GET_TYPE(x) ((x).type)
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// create CValues
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#define cosmoV_newNumber(x) ((CValue){COSMO_TNUMBER, {.num = (x)}})
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#define cosmoV_newBoolean(x) ((CValue){COSMO_TBOOLEAN, {.b = (x)}})
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#define cosmoV_newObj(x) ((CValue){COSMO_TOBJ, {.obj = (CObj*)(x)}})
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#define cosmoV_newNil() ((CValue){COSMO_TNIL, {.num = 0}})
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// read CValues
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#define cosmoV_readNumber(x) ((cosmo_Number)(x).val.num)
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#define cosmoV_readBoolean(x) ((bool)(x).val.b)
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#define cosmoV_readObj(x) ((CObj*)(x).val.obj)
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#define IS_NUMBER(x) (GET_TYPE(x) == COSMO_TNUMBER)
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#define IS_BOOLEAN(x) (GET_TYPE(x) == COSMO_TBOOLEAN)
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#define IS_NIL(x) (GET_TYPE(x) == COSMO_TNIL)
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#define IS_OBJ(x) (GET_TYPE(x) == COSMO_TOBJ)
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#endif
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typedef CValue* StkPtr;
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typedef struct CValueArray {
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size_t capacity;
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size_t count;
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CValue *values;
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} CValueArray;
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void initValArray(CState *state, CValueArray *val, size_t startCapacity);
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void cleanValArray(CState *state, CValueArray *array); // cleans array
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void appendValArray(CState *state, CValueArray *array, CValue val);
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void printValue(CValue val);
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COSMO_API bool cosmoV_equal(CValue valA, CValue valB);
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COSMO_API CObjString *cosmoV_toString(CState *state, CValue val);
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COSMO_API const char *cosmoV_typeStr(CValue val); // return constant char array for corresponding type
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#endif |