NetBoot/vasm-1/syntax/madmac/syntax.c
2020-06-20 09:33:04 +08:00

1060 lines
20 KiB
C

/* syntax.c syntax module for vasm */
/* (c) in 2015-2020 by Frank Wille */
#include "vasm.h"
#include "error.h"
/* The syntax module parses the input (read_next_line), handles
assembly-directives (section, data-storage etc.) and parses
mnemonics. Assembly instructions are split up in mnemonic name,
qualifiers and operands. new_inst returns a matching instruction,
if one exists.
Routines for creating sections and adding atoms to sections will
be provided by the main module.
*/
char *syntax_copyright="vasm madmac syntax module 0.4f (c) 2015-2020 Frank Wille";
hashtable *dirhash;
char commentchar = ';';
static char text_name[] = ".text";
static char data_name[] = ".data";
static char bss_name[] = ".bss";
static char text_type[] = "acrx";
static char data_type[] = "adrw";
static char bss_type[] = "aurw";
char *defsectname = text_name;
char *defsecttype = text_type;
static char macroname[] = ".macro";
static char endmname[] = ".endm";
static char reptname[] = ".rept";
static char endrname[] = ".endr";
static struct namelen macro_dirlist[] = {
{ 6,&macroname[0] }, { 5,&macroname[1] }, { 0,0 }
};
static struct namelen endm_dirlist[] = {
{ 5,&endmname[0] }, { 4,&endmname[1] }, { 0,0 }
};
static struct namelen rept_dirlist[] = {
{ 5,&reptname[0] }, { 4,&reptname[1] }, { 0,0 }
};
static struct namelen endr_dirlist[] = {
{ 5,&endrname[0] }, { 4,&endrname[1] }, { 0,0 }
};
static char *labname; /* current label field for assignment directives */
char *skip(char *s)
{
while (isspace((unsigned char )*s))
s++;
return s;
}
void eol(char *s)
{
s = skip(s);
if (!ISEOL(s))
syntax_error(6);
}
char *skip_operand(char *s)
{
int par_cnt = 0;
char c;
for (;;) {
c = *s;
if (START_PARENTH(c)) {
par_cnt++;
}
else if (END_PARENTH(c)) {
if (par_cnt > 0)
par_cnt--;
else
syntax_error(3); /* too many closing parentheses */
}
else if (c=='\'' || c=='\"')
s = skip_string(s,c,NULL) - 1;
else if (!c || (par_cnt==0 && (c==',' || c==commentchar)))
break;
s++;
}
if (par_cnt != 0)
syntax_error(4); /* missing closing parentheses */
return s;
}
char *const_prefix(char *s,int *base)
{
if (isdigit((unsigned char)*s)) {
*base = 10;
return s;
}
if (*s == '$' && isxdigit((unsigned char)*(s+1))) {
*base = 16;
return s+1;
}
if (*s=='@' && isdigit((unsigned char)*(s+1))) {
*base = 8;
return s+1;
}
if (*s == '%') {
*base = 2;
return s+1;
}
*base = 0;
return s;
}
char *const_suffix(char *start,char *end)
{
return end;
}
char *get_local_label(char **start)
/* local labels start with '.' */
{
char *name = *start;
char *end;
if (*name == '.') {
end = skip_identifier(name+1);
if (end != NULL) {
*start = skip(end);
return make_local_label(NULL,0,name,end-name);
}
}
return NULL;
}
/* Directives */
static void handle_equ(char *s)
{
int exp;
symbol *sym;
if (*s=='=' && *(s-1)=='=') {
s = skip(s+1);
exp = 1; /* == automatically exports a symbol */
}
else
exp = 0;
sym = new_equate(labname,parse_expr_tmplab(&s));
if (exp) {
if (is_local_label(labname))
syntax_error(1); /* cannot export local symbol */
sym->flags |= EXPORT;
}
eol(s);
}
static void handle_set(char *s)
{
new_abs(labname,parse_expr_tmplab(&s));
eol(s);
}
static int do_cond(char **s)
{
expr *condexp = parse_expr_tmplab(s);
taddr val;
if (!eval_expr(condexp,&val,NULL,0)) {
general_error(30); /* expression must be constant */
val = 0;
}
free_expr(condexp);
return val != 0;
}
static void handle_if(char *s)
{
cond_if(do_cond(&s));
eol(s);
}
static void handle_else(char *s)
{
cond_skipelse();
eol(s);
}
static void handle_endif(char *s)
{
cond_endif();
eol(s);
}
static void do_section(char *s,char *name,char *type)
{
try_end_rorg(); /* works like ending the last RORG-block */
set_section(new_section(name,type,1));
eol(s);
}
static void handle_text(char *s)
{
do_section(s,text_name,text_type);
}
static void handle_data(char *s)
{
do_section(s,data_name,data_type);
}
static void handle_bss(char *s)
{
do_section(s,bss_name,bss_type);
}
static void handle_org(char *s)
{
if (current_section!=NULL && !(current_section->flags & ABSOLUTE))
start_rorg(parse_constexpr(&s));
else
set_section(new_org(parse_constexpr(&s)));
eol(s);
}
#ifdef VASM_CPU_JAGRISC
static void handle_68000(char *s)
{
try_end_rorg(); /* works like ending the last RORG-block */
eol(s);
}
#endif
static void handle_globl(char *s)
{
char *name;
symbol *sym;
for (;;) {
if (!(name = parse_identifier(&s))) {
syntax_error(10); /* identifier expected */
return;
}
sym = new_import(name);
myfree(name);
if (sym->flags & EXPORT)
general_error(62,sym->name,get_bind_name(sym)); /* binding already set */
sym->flags |= EXPORT;
s = skip(s);
if (*s == ',')
s = skip(s+1);
else
break;
}
eol(s);
}
static void handle_assert(char *s)
{
char *expstr = s;
expr *aexp = NULL;
do {
s = skip(s);
if (aexp) /* concat. expressions with log. AND */
aexp = make_expr(LAND,aexp,parse_expr(&s));
else
aexp = parse_expr(&s);
simplify_expr(aexp);
s = skip(s);
}
while (*s++ == ','); /* another assertion, separated by comma? */
s--;
add_atom(0,new_assert_atom(aexp,cnvstr(expstr,s-expstr),NULL));
eol(s);
}
static void handle_datadef(char *s,int sz)
{
for (;;) {
char *opstart = s;
operand *op;
dblock *db = NULL;
if (OPSZ_BITS(sz)==8 && (*s=='\"' || *s=='\'')) {
if (db = parse_string(&opstart,*s,8)) {
add_atom(0,new_data_atom(db,1));
s = opstart;
}
}
if (!db) {
op = new_operand();
s = skip_operand(s);
if (parse_operand(opstart,s-opstart,op,DATA_OPERAND(sz)))
add_atom(0,new_datadef_atom(OPSZ_BITS(sz),op));
else
syntax_error(8); /* invalid data operand */
}
s = skip(s);
if (*s == ',')
s = skip(s+1);
else {
eol(s);
break;
}
}
}
static void handle_d8(char *s)
{
handle_datadef(s,8);
}
static void handle_d16(char *s)
{
handle_datadef(s,16);
}
static void handle_d32(char *s)
{
handle_datadef(s,32);
}
static void handle_i32(char *s)
{
handle_datadef(s,OPSZ_SWAP|32);
}
static void do_space(int size,expr *cnt,expr *fill)
{
atom *a;
a = new_space_atom(cnt,size>>3,fill);
a->align = DATA_ALIGN(size);
add_atom(0,a);
}
static void handle_space(char *s,int size)
{
do_space(size,parse_expr_tmplab(&s),0);
eol(s);
}
static void handle_spc8(char *s)
{
handle_space(s,8);
}
static void handle_spc16(char *s)
{
handle_space(s,16);
}
static void handle_spc32(char *s)
{
handle_space(s,32);
}
static void handle_block(char *s,int size)
{
expr *cnt,*fill=0;
cnt = parse_expr_tmplab(&s);
s = skip(s);
if (*s == ',') {
s = skip(s+1);
fill = parse_expr_tmplab(&s);
}
do_space(size,cnt,fill);
eol(s);
}
static void handle_blk8(char *s)
{
handle_block(s,8);
}
static void handle_blk16(char *s)
{
handle_block(s,16);
}
static void handle_blk32(char *s)
{
handle_block(s,32);
}
static void handle_end(char *s)
{
end_source(cur_src);
eol(s);
}
static void do_alignment(taddr align,expr *offset,size_t pad,expr *fill)
{
atom *a = new_space_atom(offset,pad,fill);
a->align = align;
add_atom(0,a);
}
static void handle_even(char *s)
{
do_alignment(2,number_expr(0),1,NULL);
eol(s);
}
static void handle_long(char *s)
{
do_alignment(4,number_expr(0),1,NULL);
eol(s);
}
static void handle_phrase(char *s)
{
do_alignment(8,number_expr(0),1,NULL);
eol(s);
}
static void handle_dphrase(char *s)
{
do_alignment(16,number_expr(0),1,NULL);
eol(s);
}
static void handle_qphrase(char *s)
{
do_alignment(32,number_expr(0),1,NULL);
eol(s);
}
static void handle_include(char *s)
{
char *name;
if (name = parse_name(&s)) {
eol(s);
include_source(name);
}
}
static void handle_incbin(char *s)
{
char *name;
if (name = parse_name(&s))
include_binary_file(name,0,0);
eol(s);
}
static void handle_rept(char *s)
{
new_repeat((utaddr)parse_constexpr(&s),NULL,NULL,rept_dirlist,endr_dirlist);
eol(s);
}
static void handle_endr(char *s)
{
syntax_error(12,endrname,reptname); /* unexpected endr without rept */
}
static void handle_list(char *s)
{
set_listing(1);
eol(s);
}
static void handle_nlist(char *s)
{
set_listing(0);
eol(s);
}
static void handle_macro(char *s)
{
char *name;
if (name = parse_identifier(&s)) {
s = skip(s);
if (ISEOL(s))
s = NULL; /* no named arguments */
new_macro(name,macro_dirlist,endm_dirlist,s);
myfree(name);
}
else
syntax_error(10); /* identifier expected */
}
static void handle_macundef(char *s)
{
char *name;
while (name = parse_identifier(&s)) {
undef_macro(name);
myfree(name);
s = skip(s);
if (*s != ',')
break;
s = skip(s+1);
}
eol(s);
}
static void handle_endm(char *s)
{
syntax_error(12,endmname,macroname); /* unexpected endm without macro */
}
static void handle_exitm(char *s)
{
leave_macro();
eol(s);
}
static void handle_print(char *s)
{
while (!ISEOL(s)) {
if (*s == '\"') {
size_t len;
char *txt;
skip_string(s,'\"',&len);
if (len > 0) {
txt = mymalloc(len+1);
s = read_string(txt,s,'\"',8);
txt[len] = '\0';
add_atom(0,new_text_atom(txt));
}
}
else {
int type = PEXP_HEX;
int size = 16;
while (*s == '/') {
/* format character */
char f;
s = skip(s+1);
f = tolower((unsigned char)*s);
if (s = skip_identifier(s)) {
switch (f) {
case 'x':
type = PEXP_HEX;
break;
case 'd':
type = PEXP_SDEC;
break;
case 'u':
type = PEXP_UDEC;
break;
case 'w':
size = 16;
break;
case 'l':
size = 32;
break;
default:
syntax_error(7,f); /* unknown print format flag */
break;
}
}
else {
syntax_error(9); /* print format corrupted */
break;
}
s = skip(s);
}
add_atom(0,new_expr_atom(parse_expr(&s),type,size));
}
s = skip(s);
if (*s != ',')
break;
s = skip(s+1);
}
add_atom(0,new_text_atom(NULL)); /* new line */
eol(s);
}
struct {
char *name;
void (*func)(char *);
} directives[] = {
"equ",handle_equ,
"=",handle_equ,
"set",handle_set,
"if",handle_if,
"else",handle_else,
"endif",handle_endif,
"rept",handle_rept,
"endr",handle_endr,
"macro",handle_macro,
"endm",handle_endm,
"exitm",handle_exitm,
"macundef",handle_macundef,
"text",handle_text,
"data",handle_data,
"bss",handle_bss,
"org",handle_org,
#ifdef VASM_CPU_JAGRISC
"68000",handle_68000,
#endif
"globl",handle_globl,
"extern",handle_globl,
"assert",handle_assert,
"dc",handle_d16,
"dc.b",handle_d8,
"dc.w",handle_d16,
"dc.l",handle_d32,
"dc.i",handle_i32,
"dcb",handle_blk16,
"dcb.b",handle_blk8,
"dcb.w",handle_blk16,
"dcb.l",handle_blk32,
"ds",handle_spc16,
"ds.b",handle_spc8,
"ds.w",handle_spc16,
"ds.l",handle_spc32,
"end",handle_end,
"even",handle_even,
"long",handle_long,
"phrase",handle_phrase,
"dphrase",handle_dphrase,
"qphrase",handle_qphrase,
"include",handle_include,
"incbin",handle_incbin,
"list",handle_list,
"nlist",handle_nlist,
"nolist",handle_nlist,
"print",handle_print
};
int dir_cnt = sizeof(directives) / sizeof(directives[0]);
/* 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;
}
/* Handles assembly directives; returns non-zero if the line
was a directive. */
static int handle_directive(char *line)
{
int idx = check_directive(&line);
if (idx >= 0) {
directives[idx].func(skip(line));
return 1;
}
return 0;
}
static int oplen(char *e,char *s)
{
while (s!=e && isspace((unsigned char)e[-1]))
e--;
return e-s;
}
void parse(void)
{
char *s,*line,*inst;
char *ext[MAX_QUALIFIERS?MAX_QUALIFIERS:1];
char *op[MAX_OPERANDS];
int ext_len[MAX_QUALIFIERS?MAX_QUALIFIERS:1];
int op_len[MAX_OPERANDS];
int ext_cnt,op_cnt,inst_len;
instruction *ip;
while (line = read_next_line()) {
if (!cond_state()) {
/* skip source until ELSE or ENDIF */
int idx = -1;
s = skip(line);
if (labname = parse_labeldef(&s,1)) {
if (*s == ':')
s++; /* skip double-colon */
myfree(labname);
s = skip(s);
}
else {
if (inst = skip_identifier(s)) {
inst = skip(inst);
idx = check_directive(&inst);
}
}
if (idx < 0)
idx = check_directive(&s);
if (idx >= 0) {
if (directives[idx].func == handle_if)
cond_skipif();
else if (directives[idx].func == handle_else)
cond_else();
else if (directives[idx].func == handle_endif)
cond_endif();
}
continue;
}
s = skip(line);
again:
if (*s=='\0' || *line=='*' || *s==commentchar)
continue;
if (labname = parse_labeldef(&s,1)) {
/* we have found a valid global or local label */
symbol *sym = new_labsym(0,labname);
if (*s == ':') {
/* double colon automatically declares label as exported */
sym->flags |= EXPORT;
s++;
}
add_atom(0,new_label_atom(sym));
myfree(labname);
s = skip(s);
}
else {
/* there can still be a sym. in the 1st fld and an assignm. directive */
inst = s;
labname = parse_symbol(&s);
if (labname == NULL) {
syntax_error(10); /* identifier expected */
continue;
}
s = skip(s);
/* Now we have labname pointing to the first field in the line
and s pointing to the second. Find out where the directive is. */
if (!ISEOL(s)) {
#ifdef PARSE_CPU_LABEL
if (PARSE_CPU_LABEL(labname,&s)) {
myfree(labname);
continue;
}
#endif
if (handle_directive(s)) {
myfree(labname);
continue;
}
}
/* directive or mnemonic must be in the first field */
myfree(labname);
s = inst;
}
if (!strnicmp(s,".iif",4) || !(strnicmp(s,"iif",3))) {
/* immediate conditional assembly: parse line after ',' when true */
s = skip(*s=='.'?s+4:s+3);
if (do_cond(&s)) {
s = skip(s);
if (*s == ',') {
s = skip(s+1);
goto again;
}
else
syntax_error(0); /* malformed immediate-if */
}
continue;
}
/* check for directives */
s = parse_cpu_special(s);
if (ISEOL(s))
continue;
if (handle_directive(s))
continue;
/* read mnemonic name */
inst = s;
ext_cnt = 0;
if (!ISIDSTART(*s)) {
syntax_error(10); /* identifier expected */
continue;
}
#if MAX_QUALIFIERS==0
while (*s && !isspace((unsigned char)*s))
s++;
inst_len = s - inst;
#else
s = parse_instruction(s,&inst_len,ext,ext_len,&ext_cnt);
#endif
if (!isspace((unsigned char)*s) && *s!='\0')
syntax_error(2); /* no space before operands */
s = skip(s);
if (execute_macro(inst,inst_len,ext,ext_len,ext_cnt,s))
continue;
/* read operands, terminated by comma or blank (unless in parentheses) */
op_cnt = 0;
while (!ISEOL(s) && 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); /* missing operand */
else
#endif
op_cnt++;
s = skip(s);
if (*s != ',')
break;
else
s = skip(s+1);
}
eol(s);
ip = new_inst(inst,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] = NULL;
}
#endif
if (ip)
add_atom(0,new_inst_atom(ip));
}
cond_check(); /* check for open conditional blocks */
}
/* parse next macro argument */
char *parse_macro_arg(struct macro *m,char *s,
struct namelen *param,struct namelen *arg)
{
arg->len = 0; /* cannot select specific named arguments */
param->name = s;
s = skip_operand(s);
param->len = s - param->name;
return s;
}
/* write 0 to buffer when macro argument is missing or empty, 1 otherwise */
static int macro_arg_defined(source *src,char *argstart,char *argend,char *d)
{
int n = find_macarg_name(src,argstart,argend-argstart);
if (n >= 0) {
/* valid argument name */
*d++ = (n<src->num_params && n<maxmacparams && src->param_len[n]>0) ?
'1' : '0';
return 1;
}
return 0;
}
/* expands arguments and special escape codes into macro context */
int expand_macro(source *src,char **line,char *d,int dlen)
{
int nc = 0;
int n;
char *s = *line;
char *end;
if (*s++ == '\\') {
/* possible macro expansion detected */
if (*s == '\\') {
if (dlen >= 1) {
*d++ = *s++;
if (esc_sequences) {
if (dlen >= 2) {
*d++ = '\\'; /* make it a double \ again */
nc = 2;
}
else
nc = -1;
}
else
nc = 1;
}
else
nc = -1;
}
else if (*s == '~') {
/* \~: insert a unique id */
nc = snprintf(d,dlen,"M%lu",src->id);
s++;
}
else if (*s == '#') {
/* \# : insert number of parameters */
nc = snprintf(d,dlen,"%d",src->num_params);
s++;
}
else if (*s == '!') {
/* \!: copy qualifier (dot-size) */
if (dlen > 1) {
*d++ = '.';
if ((nc = copy_macro_qual(src,0,d,dlen)) >= 0)
nc++;
s++;
}
else
nc = -1;
}
else if (isdigit((unsigned char)*s)) {
/* \1..\9,\0 : insert macro parameter 1..9,10 */
nc = copy_macro_param(src,*s=='0'?0:*s-'1',d,dlen);
s++;
}
else if (*s=='?' && dlen>=1) {
if ((end = skip_identifier(s+1)) != NULL) {
/* \?argname : 1 when argument defined, 0 when missing or empty */
if ((nc = macro_arg_defined(src,s+1,end,d)) >= 0)
s = end;
}
else if (*(s+1)=='{' && (end = skip_identifier(s+2))!=NULL) {
if (*end == '}') {
/* \?{argname} : 1 when argument defined, 0 when missing or empty */
if ((nc = macro_arg_defined(src,s+2,end,d)) >= 0)
s = end + 1;
}
}
}
else if (*s=='{' && (end = skip_identifier(s+1))!=NULL) {
if (*end == '}') {
if ((n = find_macarg_name(src,s+1,end-(s+1))) >= 0) {
/* \{argname}: insert macro parameter n */
nc = copy_macro_param(src,n,d,dlen);
s = end + 1;
}
}
}
else if ((end = skip_identifier(s)) != NULL) {
if ((n = find_macarg_name(src,s,end-s)) >= 0) {
/* \argname: insert named macro parameter n */
nc = copy_macro_param(src,n,d,dlen);
s = end;
}
}
if (nc >= dlen)
nc = -1;
else if (nc >= 0)
*line = s; /* update line pointer when expansion took place */
}
return nc; /* number of chars written to line buffer, -1: out of space */
}
int init_syntax()
{
size_t i;
hashdata data;
dirhash = new_hashtable(0x200);
for (i=0; i<dir_cnt; i++) {
data.idx = i;
add_hashentry(dirhash,directives[i].name,data);
}
cond_init();
current_pc_char = '*';
esc_sequences = 1;
/* assertion errors are only a warning */
modify_gen_err(WARNING,47,0);
return 1;
}
int syntax_args(char *p)
{
return 0;
}