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#include "common.h"
/*************/
/** PARSING **/
/************/
static inline bool
joinspan(struct span0 *dst, struct span0 snd)
{
if (dst->file != snd.file) return 0;
assert(dst->off <= snd.off);
dst->len = snd.off + snd.len - dst->off;
return 1;
}
enum toktag { /* single-character tokens' tag value is the character itself */
TKEOF = -1,
TKXXX,
TKNUMLIT,
TKSTRLIT,
TKEQU = '@',
TKNEQ,
TKLTE,
TKGTE,
TKSHR,
TKSHL,
TKINC,
TKDEC,
TKDOTS,
TKARROW,
TKPPCAT,
TKLOGAND,
TKLOGIOR,
TKSETADD,
TKSETSUB,
TKSETMUL,
TKSETDIV,
TKSETREM,
TKSETIOR,
TKSETXOR,
TKSETAND,
TKSETSHL,
TKSETSHR,
TKIDENT = 0x80,
#define _(kw, stdc) TKW##kw,
#include "keywords.def"
#undef _
};
struct token {
enum toktag t;
uchar ty; /* type tag for num lits */
struct span span;
union {
uvlong u;
vlong i;
double f;
const char *ident;
struct bytes s;
};
};
struct macro {
const char *name; /* interned from tk->ident */
const char **param;
struct span0 span;
uchar nparam;
bool fnlike, variadic;
struct rlist {
struct token *tk;
int n;
} rlist;
};
struct macrostack {
struct macrostack *link;
struct rlist *args;
struct span0 exspan;
int mac;
int idx;
};
extern int nerror;
struct parser {
struct parser *save;
short fileid;
const uchar *dat;
uint ndat;
uint idx, chridx;
short peekchr[2];
uint peekcidx[2];
short npeekchr;
struct macrostack *macstk;
struct token peektok;
bool eof, err;
struct env *env;
struct arena *fnarena, *exarena;
struct span fnblkspan;
};
const char *intern(const char *);
int lex(struct parser *, struct token *);
int lexpeek(struct parser *, struct token *);
void initparser(struct parser *, const char *file);
void parse(struct parser *);
/***********/
/** CTYPE **/
/***********/
#define aisprint(c) in_range(c, ' ', '~')
#define aisdigit(c) in_range(c, '0', '9')
#define aisodigit(c) in_range(c, '0', '7')
#define aisalpha(c) in_range((c)|0x20, 'a', 'z')
static inline bool aisspace(int c) { return c == ' ' || in_range(c, '\t', '\r'); }
static inline bool aisxdigit(int c) { return aisdigit(c) || in_range(c|0x20, 'a', 'f'); }
/************/
/* ANALYSIS */
/************/
enum exprkind {
EXXX, ENUMLIT, ESTRLIT, ESYM, EINIT, EGETF, ECALL, ECOND,
/* unary */
EPLUS, ENEG, ECOMPL, ELOGNOT, EDEREF, EADDROF, ECAST,
EPREINC, EPOSTINC, EPREDEC, EPOSTDEC,
/* binary */
EADD, ESUB, EMUL, EDIV, EREM, EBAND, EBIOR, EXOR, ESHL, ESHR,
ELOGAND, ELOGIOR,
EEQU, ENEQ, ELTH, EGTH, ELTE, EGTE,
ESET, ESETADD, ESETSUB, ESETMUL, ESETDIV, ESETREM, ESETAND, ESETIOR, ESETXOR, ESETSHL, ESETSHR,
ESEQ,
};
#define isunop(t) in_range(t, EPLUS, EPOSTDEC)
#define isbinop(t) in_range(t, EADD, ESEQ)
#define isassign(t) in_range(t, ESET, ESETSHR)
#define assigntobinop(t) ((t) - ESETADD + EADD)
struct expr {
uchar t;
uchar qual;
ushort narg; /* ECALL */
union type ty;
struct span span;
union {
struct expr *sub;
uvlong u; vlong i; double f; /* ENUMLIT */
struct bytes s; /* ESTRLIT */
struct decl *sym; /* ESYM */
struct initializer *ini; /* EINIT */
struct { /* EGETF */
const char *name;
uint off;
uchar bitsiz, bitoff;
} fld;
char dummy;
};
};
enum storageclass {
SCNONE,
SCTYPEDEF = 1<<0,
SCEXTERN = 1<<1,
SCSTATIC = 1<<2,
SCTHREADLOCAL = 1<<3,
SCAUTO = 1<<4,
SCREGISTER = 1<<5,
};
struct decl {
union type ty;
uchar scls;
uchar qual;
ushort align;
struct span span;
const char *name;
int id;
};
struct env {
struct env *up;
struct decls {
struct decls *prev;
struct decl decl;
} *decls;
struct tagged {
struct tagged *prev;
struct span span;
union type t;
} *tagged;
};
enum evalmode {
EVINTCONST,
EVARITH,
EVSTATICINI,
};
bool eval(struct expr *, enum evalmode);
/* vim:set ts=3 sw=3 expandtab: */
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