mirror of https://github.com/CPunch/Cosmo.git
129 lines
4.0 KiB
C
129 lines
4.0 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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{
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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_TREF,
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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 fitting more in the cpu cache on x86_64 or ARM64 architectures.
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If you don't know how this works please reference these 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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union CValue
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{
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uint64_t data;
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cosmo_Number num;
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};
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# define MASK_TYPE ((uint64_t)0x0007000000000000)
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# define MASK_PAYLOAD ((uint64_t)0x0000ffffffffffff)
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// 3 bits (low bits) are reserved for the type
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# define MAKE_PAYLOAD(x) ((uint64_t)(x)&MASK_PAYLOAD)
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# define READ_PAYLOAD(x) ((x).data & MASK_PAYLOAD)
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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) >> 48) \
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: COSMO_TNUMBER)
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# define SIG_MASK (MASK_QUIETNAN | MASK_TYPE)
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# define BOOL_SIG (MASK_QUIETNAN | ((uint64_t)(COSMO_TBOOLEAN) << 48))
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# define OBJ_SIG (MASK_QUIETNAN | ((uint64_t)(COSMO_TREF) << 48))
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# define NIL_SIG (MASK_QUIETNAN | ((uint64_t)(COSMO_TNIL) << 48))
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# define cosmoV_newNumber(x) ((CValue){.num = x})
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# define cosmoV_newBoolean(x) ((CValue){.data = MAKE_PAYLOAD(x) | BOOL_SIG})
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# define cosmoV_newRef(x) ((CValue){.data = MAKE_PAYLOAD((uintptr_t)x) | OBJ_SIG})
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# define cosmoV_newNil() ((CValue){.data = NIL_SIG})
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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_readRef(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_REF(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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struct CValue
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{
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CosmoType type;
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union
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{
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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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};
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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_newRef(x) ((CValue){COSMO_TREF, {.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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// grabs the CObj* pointer from the CValue
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# define cosmoV_readRef(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_REF(x) (GET_TYPE(x) == COSMO_TREF)
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#endif
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typedef CValue *StkPtr;
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struct CValueArray
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{
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size_t capacity;
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size_t count;
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CValue *values;
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};
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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 cosmoV_printValue(CValue val);
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COSMO_API bool cosmoV_equal(CState *state, CValue valA, CValue valB);
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COSMO_API CObjString *cosmoV_toString(CState *state, CValue val);
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COSMO_API cosmo_Number cosmoV_toNumber(CState *state, CValue val);
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COSMO_API const char *cosmoV_typeStr(CValue val);
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#endif
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