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/*
SuperCollider real time audio synthesis system
Copyright (c) 2002 James McCartney. All rights reserved.
http://www.audiosynth.com
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
PyrSlot is a value holder for SC variables.
A PyrSlot is an 8-byte value which is either a double precision float or a
32-bit tag plus a 32-bit value.
*/
#ifndef _PYRSLOT_H_
#define _PYRSLOT_H_
#include "SC_Endian.h"
#include "PyrSymbol.h"
/*
Pyrite slots are the size of an 8 byte double. If the upper bits
indicate that the double is a 'Not-A-Number' then the upper 32
bits are used as a tag to indicate one of a number of other types
whose data is in the lower 32 bits.
*/
/* some DSPs like the TIC32 do not support 8 byte doubles */
/* on such CPUs, set DOUBLESLOTS to zero */
#define DOUBLESLOTS 1
/* use the high order bits of an IEEE double NaN as a tag */
enum {
tagObj = 0x7FF90001,
tagHFrame = 0x7FF90002,
tagSFrame = 0x7FF90003,
tagInt = 0x7FF90004,
tagSym = 0x7FF90005,
tagChar = 0x7FF90006,
tagNil = 0x7FF90007, // nil, false, and true are indicated by the tag alone.
tagFalse = 0x7FF90008, // the lower 32 bits are zero.
tagTrue = 0x7FF90009,
tagInf = 0x7FF9000A,
tagPtr = 0x7FF9000B,
/* anything else is a double */
tagUnused = 0x7FF9000E
#if !DOUBLESLOTS
,tagFloat = 0x7FF9000F /* used only to initialized 4 byte float tags, never compared with */
#endif
};
struct RGBColor8 {
unsigned char c[4];
};
typedef union pyrslot {
double f;
struct {
#if BYTE_ORDER == BIG_ENDIAN
int tag;
#endif // BIG_ENDIAN
union {
int c; /* char */
int i;
float f;
void *ptr;
struct RGBColor8 r;
struct PyrObject *o;
PyrSymbol *s;
struct PyrMethod *om;
struct PyrBlock *oblk;
struct PyrClass *oc;
struct PyrFrame *of;
struct PyrList *ol;
struct PyrString *os;
struct PyrInt8Array *ob;
struct PyrDoubleArray *od;
struct PyrSymbolArray *osym;
struct PyrParseNode *opn;
struct PyrProcess *op;
struct PyrThread *ot;
struct PyrInterpreter *oi;
struct PyrPlug *plug;
} u;
#if BYTE_ORDER == LITTLE_ENDIAN
// need to swap on intel <sk>
int tag;
#endif // LITTLE_ENDIAN
} s;
} PyrSlot;
/*
these are some defines to make accessing the structure less verbose.
obviously it polutes the namespace of identifiers beginning with 'u'.
*/
#define utag s.tag
//int
#define ui s.u.i
//PyrObject
#define uo s.u.o
//PyrSymbol
#define us s.u.s
//RGBColor8
#define ur s.u.r
#define uc s.u.c
#define uoc s.u.oc
#define uof s.u.of
#define uol s.u.ol
#define uod s.u.od
#define uob s.u.ob
#define uop s.u.op
#define uoi s.u.oi
#define uod s.u.od
//string
#define uos s.u.os
#define uot s.u.ot
//method
#define uom s.u.om
//symbol array
#define uosym s.u.osym
#define uoblk s.u.oblk
#define uopn s.u.opn
#define uptr s.u.ptr
#define uplug s.u.plug
#if DOUBLESLOTS
#define uf f
#else
#define uf s.u.f
#endif
#define ucopy f
/*
Note that on the PowerPC, the fastest way to copy a slot is to
copy the double field, not the struct.
*/
/* some macros for setting values of slots */
inline void SetInt(PyrSlot* slot, int val) { (slot)->utag = tagInt; (slot)->ui = (val); }
inline void SetObject(PyrSlot* slot, void* val) { (slot)->utag = tagObj; (slot)->uo = (PyrObject*)(val); }
inline void SetSymbol(PyrSlot* slot, PyrSymbol *val) { (slot)->utag = tagSym; (slot)->us = (val); }
inline void SetChar(PyrSlot* slot, char val) { (slot)->utag = tagChar; (slot)->uc = (val); }
inline void SetPtr(PyrSlot* slot, void* val) { (slot)->utag = tagPtr; (slot)->uptr = (void*)(val); }
inline void SetObjectOrNil(PyrSlot* slot, PyrObject* val)
{
if (val) {
(slot)->utag = tagObj;
(slot)->uo = (val);
} else {
(slot)->utag = tagNil;
(slot)->ui = 0;
}
}
inline void SetTrue(PyrSlot* slot) { (slot)->utag = tagTrue; (slot)->ui = 0; }
inline void SetFalse(PyrSlot* slot) { (slot)->utag = tagFalse; (slot)->ui = 0; }
inline void SetBool(PyrSlot* slot, bool test) { (slot)->utag = ((test) ? tagTrue : tagFalse); (slot)->ui = 0; }
inline void SetNil(PyrSlot* slot) { (slot)->utag = tagNil; (slot)->ui = 0; }
inline void SetInf(PyrSlot* slot) { (slot)->utag = tagInf; (slot)->ui = 0; }
#if DOUBLESLOTS
inline void SetFloat(PyrSlot* slot, double val) { (slot)->uf = (val); }
#else
inline void SetFloat(PyrSlot* slot, double val) { (slot)->utag = s_float; (slot)->uf = (val); }
#endif
inline bool IsObj(PyrSlot* slot) { return ((slot)->utag == tagObj); }
inline bool NotObj(PyrSlot* slot) { return ((slot)->utag != tagObj); }
inline bool IsNil(PyrSlot* slot) { return ((slot)->utag == tagNil); }
inline bool NotNil(PyrSlot* slot) { return ((slot)->utag != tagNil); }
inline bool IsFalse(PyrSlot* slot) { return ((slot)->utag == tagFalse); }
inline bool IsTrue(PyrSlot* slot) { return ((slot)->utag == tagTrue); }
inline bool SlotEq(PyrSlot* a, PyrSlot* b) { return ((a)->ui == (b)->ui && (a)->utag == (b)->utag); }
inline bool IsSym(PyrSlot* slot) { return ((slot)->utag == tagSym); }
inline bool NotSym(PyrSlot* slot) { return ((slot)->utag != tagSym); }
inline bool IsInt(PyrSlot* slot) { return ((slot)->utag == tagInt); }
inline bool NotInt(PyrSlot* slot) { return ((slot)->utag != tagInt); }
inline bool IsFloatTag(int tag) { return ((tag & 0xFFFFFFF0) != 0x7FF90000); }
inline bool IsFloat(PyrSlot* slot) { return (((slot)->utag & 0xFFFFFFF0) != 0x7FF90000); }
inline bool NotFloat(PyrSlot* slot) { return (((slot)->utag & 0xFFFFFFF0) == 0x7FF90000); }
inline bool IsInf(PyrSlot* slot) { return ((slot)->utag == tagInf); }
inline bool IsPtr(PyrSlot* slot) { return ((slot)->utag == tagPtr); }
inline bool IsFrame(PyrSlot* slot) { return ((slot)->utag == tagHFrame || (slot)->utag == tagSFrame); }
void dumpPyrSlot(PyrSlot* slot);
void slotString(PyrSlot *slot, char *str);
void slotOneWord(PyrSlot *slot, char *str);
bool postString(PyrSlot *slot, char *str);
char *slotSymString(PyrSlot* slot);
int asCompileString(PyrSlot *slot, char *str);
int slotIntVal(PyrSlot* slot, int *value);
int slotFloatVal(PyrSlot* slot, float *value);
int slotDoubleVal(PyrSlot *slot, double *value);
int slotStrVal(PyrSlot *slot, char *str, int maxlen);
int slotPStrVal(PyrSlot *slot, unsigned char *str);
int slotSymbolVal(PyrSlot *slot, PyrSymbol **symbol);
extern PyrSlot o_nil, o_true, o_false, o_inf;
extern PyrSlot o_pi, o_twopi;
extern PyrSlot o_fhalf, o_fnegone, o_fzero, o_fone, o_ftwo;
extern PyrSlot o_negtwo, o_negone, o_zero, o_one, o_two;
extern PyrSlot o_emptyarray, o_onenilarray, o_argnamethis;
extern PyrSymbol *s_object; // "Object"
extern PyrSymbol *s_this; // "this"
extern PyrSymbol *s_super; // "super"
inline int slotFloatVal(PyrSlot *slot, float *value)
{
if (IsFloat(slot)) {
*value = slot->uf;
return errNone;
} else if (IsInt(slot)) {
*value = slot->ui;
return errNone;
}
return errWrongType;
}
inline int slotIntVal(PyrSlot *slot, int *value)
{
if (IsInt(slot)) {
*value = slot->ui;
return errNone;
} else if (IsFloat(slot)) {
*value = (int)slot->uf;
return errNone;
}
return errWrongType;
}
inline int slotDoubleVal(PyrSlot *slot, double *value)
{
if (IsFloat(slot)) {
*value = slot->uf;
return errNone;
} else if (IsInt(slot)) {
*value = slot->ui;
return errNone;
}
return errWrongType;
}
inline int slotSymbolVal(PyrSlot *slot, PyrSymbol **symbol)
{
if (!IsSym(slot)) return errWrongType;
*symbol = slot->us;
return errNone;
}
inline void slotCopy(PyrSlot *dst, PyrSlot *src, int num)
{
double *dstp = (double*)dst - 1;
double *srcp = (double*)src - 1;
for (int i=0;i<num;++i) { *++dstp = *++srcp; }
}
#endif
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