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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,
TKCHRLIT,
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 {
short t; /* toktag */
bool litlit;
uint len;
struct span span;
const char *s;
/* for (multi-)character tokens s & len are unused
* for keywords, s is constant cstring, len = strlen(s)
* for idents, s is interned cstring, len = strlen(s)
* for strlit and chrlit:
* when litlit : s points to start of string within file buffer (after the ")
* len == span.sl.len - 2 (string data appears literally in source code)
* otherwise s is heap allocated buffer of len bytes
* for numlit:
* when litlit : s points to start of token within file buffer (normal case)
* len == span.sl.len (number literal appears literally in source code)
* otherwise s is heap allocated buffer of len bytes
*/
};
struct macro {
const char *name; /* interned */
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;
uint loopdepth, switchdepth;
struct block *loopbreak, *loopcont;
};
const char *intern(const char *);
int lex(struct parser *, struct token *);
int lexpeek(struct parser *, struct token *);
enum typetag parsenumlit(uvlong *, double *, const struct token *, bool ispp);
void initparser(struct parser *, const char *file);
void parse(struct parser *);
/************/
/* 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 {
struct expr *sub;
struct {
ushort off;
uchar bitsiz, bitoff;
} fld; /* EGETF */
};
uvlong u; vlong i; double f; /* ENUMLIT */
struct bytes s; /* ESTRLIT */
struct decl *sym; /* ESYM */
struct initializer *ini; /* EINIT */
};
};
enum storageclass {
SCNONE,
SCTYPEDEF = 1<<0,
SCEXTERN = 1<<1,
SCSTATIC = 1<<2,
SCTHREADLOCAL = 1<<3,
SCAUTO = 1<<4,
SCREGISTER = 1<<5,
};
enum evalmode {
EVINTCONST,
EVARITH,
EVSTATICINI,
EVFOLD,
};
bool eval(struct expr *, enum evalmode);
/* vim:set ts=3 sw=3 expandtab: */
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