ref: faab83b89701457c3dff6b9780af8968b8132d95
dir: /as/main.c/
static char sccsid[] = "@(#) ./as/main.c"; #include <stdio.h> #include <stdlib.h> #include <string.h> #include "../inc/scc.h" #include "as.h" int cmp(const void *f1, const void *f2) { const Ins *ins = f2; return strcmp(f1, ins->str); } int match(Op *op, Arg *args) { return 1; } void incpc(int siz) { TUINT pc, curpc; pc = cursec->pc; curpc = cursec->curpc; cursec->curpc += siz; cursec->pc += siz; if (pass == 2) return; if (cursec->pc > cursec->max) cursec->max = cursec->pc; if (pc > cursec->pc || curpc > cursec->curpc || cursec->curpc > maxaddr || cursec->pc > maxaddr) { die("address overflow"); } } void as(char *text, char *xargs) { Ins *ins; Op *op, *lim; Arg *args; ins = bsearch(text, instab, nr_ins, sizeof(Ins), cmp); if (!ins) { error("invalid instruction"); return; } args = getargs(xargs); lim = &optab[ins->end]; for (op = &optab[ins->begin]; op < lim; ++op) { if (match(op, args)) break; } if (op == lim) { error("invalid operands"); return; } (*op->format)(op, args); } int dopass(char *fname) { struct line line; FILE *fp; extern int nerrors; if ((fp = fopen(fname, "r")) == NULL) die("as: error opening '%s'", fname); isections(); while (next(fp, &line)) { linesym = NULL; if (line.label) linesym = deflabel(line.label); if (line.op) as(line.op, line.args); else if (line.args) error("arguments without an opcode"); } if (fclose(fp)) die("as: error reading from input file '%s'", fname); return nerrors == 0; } static void usage(void) { fputs("usage: as filename\n", stderr); exit(1); } int main(int argc, char *argv[]) { if (argc != 2) usage(); filename = argv[1]; for (pass = 1; pass <= 2 && dopass(argv[1]); pass++) /* nothing */; writeout("a.out"); return 0; }