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#pragma once
#include <u.h>
#include <libn.h>
#define iota(x) 1 << (x)
/* core types */
typedef struct Io Io;
typedef struct Pos Pos;
typedef struct Token Token;
typedef struct Sym Sym;
typedef struct Type Type;
typedef struct Spec Spec;
typedef struct Decl Decl;
typedef struct Stmt Stmt;
typedef struct Expr Expr;
/* maps */
typedef struct SymTab SymTab;
typedef struct StrTab StrTab;
// -----------------------------------------------------------------------
// lexing: byte stream -> tokens
// pre-processor built in
struct Pos
{
int col;
int line;
string path;
};
#define DIRECTIVES \
DIRECTIVE(Dpragma,"pragma") \
DIRECTIVE(Dinclude,"include") \
DIRECTIVE(Dif,"if") \
DIRECTIVE(Ddefine,"define") \
DIRECTIVE(Difdef,"ifdef") \
DIRECTIVE(Difndef,"ifndef")
#define DIRECTIVE(a, b) a,
enum { DIRECTIVES };
#undef DIRECTIVE
#define DIRECTIVE(a, b) b,
static byte *directives[] = { DIRECTIVES };
#undef DIRECTIVE
#define KEYWORDS \
KEYWORD(Kauto,"auto") \
KEYWORD(Kregister,"register") \
KEYWORD(Kstatic,"static") \
KEYWORD(Kextern,"extern") \
KEYWORD(Ktypedef,"typedef") \
KEYWORD(Kconst,"const") \
KEYWORD(Kvolatile,"volatile") \
KEYWORD(Krestrict,"restrict") \
KEYWORD(Kinline,"inline") \
KEYWORD(Kvoid,"void") \
KEYWORD(Kchar,"char") \
KEYWORD(Kint,"int") \
KEYWORD(Kfloat,"float") \
KEYWORD(Kdouble,"double") \
KEYWORD(Ksigned,"signed") \
KEYWORD(Kunsigned,"unsigned") \
KEYWORD(Kshort,"short") \
KEYWORD(Klong,"long") \
KEYWORD(Kvlong,"vlong") \
KEYWORD(Kstruct,"struct") \
KEYWORD(Kunion,"union") \
KEYWORD(Kenum,"enum") \
KEYWORD(Kfor,"for") \
KEYWORD(Kdo,"do") \
KEYWORD(Kwhile,"while") \
KEYWORD(Kcontinue,"continue") \
KEYWORD(Kif,"if") \
KEYWORD(Kelse,"else") \
KEYWORD(Kswitch,"switch") \
KEYWORD(Kcase,"case") \
KEYWORD(Kdefault,"default") \
KEYWORD(Kbreak,"break") \
KEYWORD(Kgoto,"goto") \
KEYWORD(Kreturn,"return") \
KEYWORD(Ksizeof,"sizeof") \
KEYWORD(Kalignof,"alignof")
#define KEYWORD(a, b) a,
enum { KEYWORDS };
#undef KEYWORD
#define KEYWORD(a, b) b,
static byte *keywords[] = { KEYWORDS };
#undef KEYWORD
#undef KEYWORDS
#define TOKENS \
TOK(Anil,"nil") \
TOK(Aeof,"eof") \
TOK(Aeq, "==") \
TOK(Aneq, "!=") \
TOK(Anot, "!") \
TOK(Aneg, "~") \
TOK(Axor, "^") \
TOK(Aor, "|") \
TOK(Aand, "&") \
TOK(Aoror, "||") \
TOK(Aandand, "&&") \
TOK(Aadd,"+") \
TOK(Asub,"-") \
TOK(Astar,"*") \
TOK(Adiv,"/") \
TOK(Amod,"%") \
TOK(Agt,">") \
TOK(Alt,"<") \
TOK(Agteq,">=") \
TOK(Alteq,"<=") \
TOK(Alsft,"<<") \
TOK(Arsft,">>") \
TOK(Ainc,"++") \
TOK(Adec,"--") \
TOK(Aasn,"=") \
TOK(Aorasn,"|=") \
TOK(Axorasn,"^=") \
TOK(Aandasn,"&=") \
TOK(Aaddasn,"+=") \
TOK(Asubasn,"-=") \
TOK(Amulasn,"*=") \
TOK(Adivasn,"/=") \
TOK(Amodasn,"%=") \
TOK(Alsftasn,"<<=") \
TOK(Arsftasn,">>=") \
TOK(Acomma,",") \
TOK(Acolon,":") \
TOK(Asemi,";") \
TOK(Alparen,"(") \
TOK(Arparen,")") \
TOK(Albrace,"{") \
TOK(Arbrace,"}") \
TOK(Albrkt,"[") \
TOK(Arbrkt,"]") \
TOK(Adot,".") \
TOK(Aarrow,"->") \
TOK(Aqmark,"?") \
TOK(Aellip,"...") \
TOK(Alit,"<literal>") \
TOK(Aident,"<identifier>") \
TOK(Akeywd,"<keyword>") \
#define TOK(a, b) a,
enum
{
TOKENS
};
#undef TOK
#define TOK(a, b) b,
static byte *tokens[] = { TOKENS };
#undef TOK
#undef TOKENS
/* TODO: store literals in a big val */
struct Token
{
uint32 kind;
struct Pos pos;
union {
string str;
double f;
vlong i;
};
};
enum
{
Svar,
Sfunc,
Smacro,
};
struct Sym
{
uint32 kind;
string name;
};
struct Lexer
{
Token tok;
Io *io;
SymTab *sym;
byte buf[1024];
};
// -----------------------------------------------------------------------
// parsing & type resolution
// tokens -> ast
/* statements */
enum
{
Sbad,
Slabel,
Sblock,
Sexpr,
Sselect,
Sloop,
Sjump,
};
struct Stmt
{
union
{
};
};
/* expressions */
enum
{
Xbad,
Xparen,
Xident,
Xlit,
Xassign,
Xcomma,
Xternary,
Xbinary,
Xprefix,
Xunary,
Xpostfix,
Xcast,
};
struct Expr
{
union
{
};
};
/* declarations */
// specifiers
enum
{
Mauto = iota(0), // Corresponds to auto int
Mtype = iota(1),
Mstatic = iota(2),
Mreg = iota(3),
Qconst = iota(4),
Qrestr = iota(5),
Qvoltl = iota(6),
Finlne = iota(7),
Tlong = iota(8),
Tvlong = iota(9),
Tsign = iota(10),
Tunsign = iota(11),
Tvoid = iota(12),
Tchar = iota(13),
Tshort = iota(14),
Tfloat = iota(15),
Tdouble = iota(16),
Tcmplx = iota(17),
Timag = iota(18),
Taggr = iota(19),
Tenum = iota(20),
Tname = iota(21),
};
enum
{
Dnil,
Dbad,
Dfunc,
Dvar,
};
struct Decl
{
Pos pos;
uint kind;
};
// -----------------------------------------------------------------------
// compiler
struct Io
{
io·Buffer b;
string path;
uint32 flag;
struct Io *link;
};
struct StrTab
{
int32 n_buckets, size, n_occupied, upper_bound;
int32 *flags;
string *keys;
int32 *vals;
};
static struct
{
mem·Arena *heap;
StrTab strs;
string *include;
Io *io;
Io iostk[100];
} C;
void init();
int32 intern(byte **str);
string internview(byte* beg, byte *end);
#undef iota
|
