/* Handles assembly directives; returns non-zero if the line
was a directive. */
static int handle_directive(char *line)
{
char *s,*name;
hashdata data;
s=skip(line);
if(!ISIDSTART(*s))
return 0;
name=s;
while(ISIDCHAR(*s))
s++;
if(!find_namelen(dirhash,name,s-name,&data))
return 0;
directives[data.idx].func(skip(s));
return 1;
}
/* checks for a valid directive, and return index when found, -1 otherwise */
static int check_directive(char **line)
{
char *s,*name;
hashdata data;
s = skip(*line);
if (!ISIDSTART(*s) && *s!='=')
return -1;
name = s++;
while (ISIDCHAR(*s) || *s=='.')
s++;
if (*name=='.') /* leading dot is optional for all directives */
name++;
if (!find_namelen_nc(dirhash,name,s-name,&data))
return -1;
*line = s;
return data.idx;
}
/* checks for a valid directive, and return index when found, -1 otherwise */
static int check_directive(char **line)
{
char *s,*name;
hashdata data;
s = skip(*line);
if (!ISIDSTART(*s))
return -1;
name = s++;
while (ISIDCHAR(*s))
s++;
if (*name == '.')
name++;
else if (!nodotneeded)
return -1;
if (!find_namelen(dirhash,name,s-name,&data))
return -1;
*line = s;
return data.idx;
}
static void handle_section(char *s)
{
char *name,*attr;
if(*s!='\"'){
name=s;
if(!ISIDSTART(*s)){
syntax_error(10);
return;
}
while(ISIDCHAR(*s))
s++;
name=cnvstr(name,s-name);
s=skip(s);
}else{
s++;
name=s;
while(*s&&*s!='\"')
s++;
name=cnvstr(name,s-name);
s=skip(s+1);
}
if(*s==','){
s=skip(s+1);
attr=s;
if(*s!='\"')
syntax_error(7);
else
s++;
attr=s;
while(*s&&*s!='\"')
s++;
attr=cnvstr(attr,s-attr);
s=skip(s+1);
}else
attr="";
new_section(name,attr,1);
switch_section(name,attr);
eol(s);
}
int main(int argc,char **argv)
{
int i;
for(i=1; i<argc; i++) {
if(argv[i][0]=='-'&&argv[i][1]=='F') {
output_format=argv[i]+2;
argv[i][0]=0;
}
if(!strcmp("-quiet",argv[i])) {
verbose=0;
argv[i][0]=0;
}
}
if(!init_output(output_format))
general_error(16,output_format);
if(!init_main())
general_error(10,"main");
if(verbose)
printf("%s\n%s\n%s\n%s\n",copyright,cpu_copyright,syntax_copyright,output_copyright);
for(i=1; i<argc; i++) {
if(argv[i][0]==0)
continue;
if(argv[i][0]!='-') {
if(inname)
general_error(11);
inname=argv[i];
continue;
}
if(!strcmp("-o",argv[i])&&i<argc-1) {
if(outname)
general_error(28,'o');
outname=argv[++i];
continue;
}
if(!strcmp("-L",argv[i])&&i<argc-1) {
if(listname)
general_error(28,'L');
listname=argv[++i];
produce_listing=1;
continue;
}
if(!strcmp("-Lnf",argv[i])) {
listformfeed=0;
continue;
}
if(!strcmp("-Lns",argv[i])) {
listnosyms=1;
continue;
}
if(!strncmp("-Ll",argv[i],3)) {
sscanf(argv[i]+3,"%i",&listlinesperpage);
continue;
}
if(!strncmp("-D",argv[i],2)) {
char *def=NULL;
expr *val;
if(argv[i][2])
def=&argv[i][2];
else if (i<argc-1)
def=argv[++i];
if(def) {
char *s=def;
if(ISIDSTART(*s)) {
s++;
while(ISIDCHAR(*s))
s++;
def=cnvstr(def,s-def);
if(*s=='=') {
s++;
val=parse_expr(&s);
}
else
val=number_expr(1);
if(*s)
general_error(23,'D'); /* trailing garbage after option */
new_abs(def,val);
myfree(def);
continue;
}
}
}
if(!strncmp("-I",argv[i],2)) {
char *path=NULL;
if(argv[i][2])
path=&argv[i][2];
else if (i<argc-1)
path=argv[++i];
if(path) {
new_include_path(path);
continue;
}
}
if(!strcmp("-unnamed-sections",argv[i])) {
unnamed_sections=1;
continue;
}
if(!strcmp("-ignore-mult-inc",argv[i])) {
ignore_multinc=1;
continue;
}
if(!strcmp("-nocase",argv[i])) {
nocase=1;
continue;
}
if(!strcmp("-noesc",argv[i])) {
esc_sequences=0;
continue;
}
if(!strcmp("-nosym",argv[i])) {
no_symbols=1;
continue;
}
if(!strncmp("-nowarn=",argv[i],8)) {
int wno;
sscanf(argv[i]+8,"%i",&wno);
disable_warning(wno);
continue;
}
else if(!strcmp("-w",argv[i])) {
no_warn=1;
continue;
}
if(!strncmp("-maxerrors=",argv[i],11)) {
sscanf(argv[i]+11,"%i",&max_errors);
continue;
}
else if(!strcmp("-pic",argv[i])) {
pic_check=1;
continue;
}
if(cpu_args(argv[i]))
continue;
if(syntax_args(argv[i]))
continue;
if(output_args(argv[i]))
continue;
if (!strncmp("-x",argv[i],2)) {
auto_import=0;
continue;
}
general_error(14,argv[i]);
}
if(inname) {
setfilename(inname);
setdebugname(inname);
include_source(inname);
} else
general_error(15);
if(!init_parse())
general_error(10,"parse");
if(!init_syntax())
general_error(10,"syntax");
if(!init_cpu())
general_error(10,"cpu");
parse();
if(errors==0||produce_listing)
resolve();
if(errors==0||produce_listing)
assemble();
if(errors==0&&!auto_import)
undef_syms();
if(!listname)
listname="a.lst";
if(produce_listing)
write_listing(listname);
if(!outname)
outname="a.out";
if(errors==0) {
if(verbose)
statistics();
outfile=fopen(outname,"wb");
if(!outfile)
general_error(13,outname);
write_object(outfile,first_section,first_symbol);
}
leave();
return 0; /* not reached */
}
void parse(void)
{
char *s,*line,*ext[MAX_QUALIFIERS?MAX_QUALIFIERS:1],*op[MAX_OPERANDS];
char *labname,*start;
int inst_len,ext_len[MAX_QUALIFIERS?MAX_QUALIFIERS:1],op_len[MAX_OPERANDS];
int ext_cnt,op_cnt;
instruction *ip;
while (line=read_next_line()){
if (clev >= MAXCONDLEV)
syntax_error(16,clev); /* nesting depth exceeded */
if (!cond[clev]) {
/* skip source until ELSE or ENDIF */
int idx;
s = line;
idx = check_directive(&s);
if (idx >= 0) {
if (!strncmp(directives[idx].name,"if",2)) {
ifnesting++;
}
else if (ifnesting==0 && !strncmp(directives[idx].name,"else",4)) {
cond[clev] = 1;
}
else if (directives[idx].func == handle_endif) {
if (ifnesting == 0) {
if (clev > 0)
clev--;
else
syntax_error(14); /* endif without if */
}
else
ifnesting--;
}
}
continue;
}
s=skip(line);
if(handle_directive(s))
continue;
/* skip spaces */
s=skip(s);
if(!*s||*s==commentchar)
continue;
/* check for label */
start=s;
if(labname=get_local_label(&s)){ /* local label? */
if(*s!=':'){
s=start;
myfree(labname);
labname=NULL;
}
}
else if(ISIDSTART(*s)){ /* or global label? */
s++;
while(ISIDCHAR(*s)) s++;
if(*s!=':')
s=start;
else
labname=cnvstr(start,s-start);
}
if(labname){
/* we have found a valid global or local label */
add_atom(0,new_label_atom(new_labsym(0,labname)));
s=skip(s+1);
myfree(labname);
}
if(!*s||*s==commentchar)
continue;
s=skip(parse_cpu_special(s));
if(*s==0||*s==commentchar)
continue;
if(handle_directive(s))
continue;
/* read mnemonic name */
start=s;
ext_cnt=0;
if(!ISIDSTART(*s)){
syntax_error(10);
continue;
}
#if MAX_QUALIFIERS==0
while(*s&&!isspace((unsigned char)*s))
s++;
inst_len=s-start;
#else
s=parse_instruction(s,&inst_len,ext,ext_len,&ext_cnt);
#endif
s=skip(s);
if(execute_macro(start,inst_len,ext,ext_len,ext_cnt,s,clev))
continue;
/* read operands, terminated by comma (unless in parentheses) */
op_cnt=0;
while(*s&&*s!=commentchar&&op_cnt<MAX_OPERANDS){
op[op_cnt]=s;
s=skip_operand(s);
op_len[op_cnt]=oplen(s,op[op_cnt]);
#if !ALLOW_EMPTY_OPS
if(op_len[op_cnt]<=0)
syntax_error(5);
else
#endif
op_cnt++;
s=skip(s);
if(*s!=','){
break;
}else{
s=skip(s+1);
}
}
s=skip(s);
if(*s!=0&&*s!=commentchar) syntax_error(6);
ip=new_inst(start,inst_len,op_cnt,op,op_len);
#if MAX_QUALIFIERS>0
if(ip){
int i;
for(i=0;i<ext_cnt;i++)
ip->qualifiers[i]=cnvstr(ext[i],ext_len[i]);
for(;i<MAX_QUALIFIERS;i++)
ip->qualifiers[i]=0;
}
#endif
if(ip){
add_atom(0,new_inst_atom(ip));
}else
;
}
if (clev > 0)
syntax_error(15); /* if without endif */
}