mirror of
https://github.com/elliotnunn/NetBoot.git
synced 2024-12-22 16:30:08 +00:00
1060 lines
20 KiB
C
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,¯oname[0] }, { 5,¯oname[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;
|
|
}
|