scc

simple c99 compiler
git clone git://git.simple-cc.org/scc
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as.h (2608B)

      1 /*
      2  * First 3 bits of flags in segments and symbols are for the
      3  * type of segment
      4  */
      5 enum symflags {
      6 	FREG    = 1 << 0,
      7 	FSECT   = 1 << 1,
      8 	FSYM    = 1 << 2,
      9 	FCOMMON = 1 << 3,
     10 	FEXTERN = 1 << 4,
     11 	FDEF    = 1 << 5,
     12 	FGLOBAL = 1 << 6,
     13 	FABS    = 1 << 7,
     14 };
     15 
     16 enum common_args {
     17 	AIMM = 1,
     18 	ASTR,
     19 	AREG,
     20 	ANUMBER,
     21 	AIMM2,
     22 	AIMM3,
     23 	AIMM5,
     24 	AIMM8,
     25 	AIMM16,
     26 	AIMM32,
     27 	AIMM64,
     28 	AINDIR,
     29 	AINDEX,
     30 	ADIRECT,
     31 	AREG_OFF,
     32 	ASYM,
     33 	AOPT,
     34 	AREP,
     35 	AMAX,
     36 };
     37 
     38 enum tokens {
     39 	EOS = -1,
     40 	IDEN = 1,
     41 	NUMBER,
     42 	REG,
     43 	STRING,
     44 	MINUS,
     45 	SHL,
     46 	SHR,
     47 	GE,
     48 	LE,
     49 };
     50 
     51 #define MAXSYM 63
     52 
     53 typedef struct reloc Reloc;
     54 typedef struct ins Ins;
     55 typedef struct op Op;
     56 typedef struct node Node;
     57 typedef void Format(Op *, Node **);
     58 
     59 struct line {
     60 	char *label;
     61 	char *op;
     62 	char *args;
     63 };
     64 
     65 struct ins {
     66 	int begin, end;
     67 	char *str;
     68 };
     69 
     70 struct reloc {
     71 	size_t offset;
     72 	Symbol *sym;
     73 	unsigned char flags;
     74 	unsigned char size;
     75 	unsigned char nbits;
     76 	unsigned char shift;
     77 };
     78 
     79 struct op {
     80 	unsigned char flags;
     81 	unsigned char size;
     82 	void (*format)(Op *, Node **);
     83 	unsigned char *bytes;
     84 	unsigned char *args;
     85 };
     86 
     87 struct node {
     88 	unsigned char op;
     89 	unsigned char addr;
     90 	struct symbol *sym;
     91 	struct node *left;
     92 	struct node *right;
     93 };
     94 
     95 union yylval {
     96 	unsigned long long val;
     97 	Symbol *sym;
     98 };
     99 
    100 /* symbol.c */
    101 void cleansecs(void);
    102 void ibinfmt(void);
    103 void emit(char *, int);
    104 Section *defsec(char *, char *);
    105 Symbol *tmpsym(unsigned long long);
    106 void killtmp(void);
    107 int toobig(Node *, int);
    108 void dumpstab(char *);
    109 Symbol *lookup(char *);
    110 Symbol *deflabel(char *);
    111 unsigned long long getpc(void);
    112 
    113 /* parser.c */
    114 Node **getargs(char *);
    115 void error(char *, ...);
    116 /* Avoid errors in files where stdio is not included */
    117 #ifdef stdin
    118 int nextline(struct line *);
    119 #endif
    120 void unexpected(void);
    121 void expect(int);
    122 int next(void);
    123 #define accept(t) (yytoken == (t) ? next() : 0)
    124 void regctx(int mode);
    125 Node *getreg(void);
    126 Node *operand(char **);
    127 void addinput(char *);
    128 int delinput(void);
    129 int ahead(void);
    130 
    131 /* expr.c */
    132 Node *expr(void);
    133 void deltree(Node *);
    134 Node *node(int, Node *, Node *);
    135 
    136 /* proc.c */
    137 void iarch(void);
    138 int match(Op *, Node **);
    139 Node *moperand(void);
    140 
    141 /* ins.c */
    142 char *tobytes(unsigned long long, int, int);
    143 
    144 /* binfmt.c */
    145 void writeout(char *);
    146 
    147 /*
    148  * Definition of global variables
    149  */
    150 extern unsigned long M, S, K;
    151 extern short hashmap[];
    152 extern Section *cursec;
    153 extern Ins instab[];
    154 extern Op optab[];
    155 extern int pass;
    156 extern unsigned long long maxaddr;
    157 extern int endian;
    158 extern Symbol *linesym;
    159 extern char *infile, *outfile;
    160 extern int endpass;
    161 extern int yytoken;
    162 extern size_t yylen;
    163 extern union yylval yylval;
    164 extern char yytext[];