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efl/legacy/embryo/src/bin/embryo_cc_sc2.c

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/* Small compiler - File input, preprocessing and lexical analysis functions
*
* Copyright (c) ITB CompuPhase, 1997-2003
*
* This software is provided "as-is", without any express or implied warranty.
* In no event will the authors be held liable for any damages arising from
* the use of this software.
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software in
* a product, an acknowledgment in the product documentation would be
* appreciated but is not required.
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
* 3. This notice may not be removed or altered from any source distribution.
*
* Version: $Id$
*/
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <math.h>
#include "embryo_cc_sc.h"
#if defined LINUX
#include <embryo_cc_sclinux.h>
#endif
#if defined FORTIFY
#include "fortify.h"
#endif
static int match(char *st,int end);
static cell litchar(char **lptr,int rawmode);
static int alpha(char c);
static int icomment; /* currently in multiline comment? */
static int iflevel; /* nesting level if #if/#else/#endif */
static int skiplevel; /* level at which we started skipping */
static int elsedone; /* level at which we have seen an #else */
static char term_expr[] = "";
static int listline=-1; /* "current line" for the list file */
/* pushstk & popstk
*
* Uses a LIFO stack to store information. The stack is used by doinclude(),
* doswitch() (to hold the state of "swactive") and some other routines.
*
* Porting note: I made the bold assumption that an integer will not be
* larger than a pointer (it may be smaller). That is, the stack element
* is typedef'ed as a pointer type, but I also store integers on it. See
* SC.H for "stkitem"
*
* Global references: stack,stkidx (private to pushstk() and popstk())
*/
static stkitem stack[sSTKMAX];
static int stkidx;
SC_FUNC void pushstk(stkitem val)
{
if (stkidx>=sSTKMAX)
error(102,"parser stack"); /* stack overflow (recursive include?) */
stack[stkidx]=val;
stkidx+=1;
}
SC_FUNC stkitem popstk(void)
{
if (stkidx==0)
return (stkitem) -1; /* stack is empty */
stkidx-=1;
return stack[stkidx];
}
SC_FUNC int plungequalifiedfile(char *name)
{
static char *extensions[] = { ".inc", ".sma", ".small" };
FILE *fp;
char *ext;
int ext_idx;
ext_idx=0;
do {
fp=(FILE*)sc_opensrc(name);
ext=strchr(name,'\0'); /* save position */
if (fp==NULL) {
/* try to append an extension */
strcpy(ext,extensions[ext_idx]);
fp=(FILE*)sc_opensrc(name);
if (fp==NULL)
*ext='\0'; /* on failure, restore filename */
} /* if */
ext_idx++;
} while (fp==NULL && ext_idx<(sizeof extensions / sizeof extensions[0]));
if (fp==NULL) {
*ext='\0'; /* restore filename */
return FALSE;
} /* if */
pushstk((stkitem)inpf);
pushstk((stkitem)inpfname); /* pointer to current file name */
pushstk((stkitem)curlibrary);
pushstk((stkitem)iflevel);
assert(skiplevel==0);
pushstk((stkitem)icomment);
pushstk((stkitem)fcurrent);
pushstk((stkitem)fline);
inpfname=duplicatestring(name);/* set name of include file */
if (inpfname==NULL)
error(103); /* insufficient memory */
inpf=fp; /* set input file pointer to include file */
fnumber++;
fline=0; /* set current line number to 0 */
fcurrent=fnumber;
icomment=FALSE;
setfile(inpfname,fcurrent);
setfiledirect(inpfname);
listline=-1; /* force a #line directive when changing the file */
setactivefile(fcurrent);
return TRUE;
}
SC_FUNC int plungefile(char *name,int try_currentpath,int try_includepaths)
{
int result=FALSE;
int i;
char *ptr;
if (try_currentpath)
result=plungequalifiedfile(name);
if (try_includepaths && name[0]!=DIRSEP_CHAR) {
for (i=0; !result && (ptr=get_path(i))!=NULL; i++) {
char path[_MAX_PATH];
strncpy(path,ptr,sizeof path);
path[sizeof path - 1]='\0'; /* force '\0' termination */
strncat(path,name,sizeof(path)-strlen(path));
path[sizeof path - 1]='\0';
result=plungequalifiedfile(path);
} /* while */
} /* if */
return result;
}
static void check_empty(char *lptr)
{
/* verifies that the string contains only whitespace */
while (*lptr<=' ' && *lptr!='\0')
lptr++;
if (*lptr!='\0')
error(38); /* extra characters on line */
}
/* doinclude
*
* Gets the name of an include file, pushes the old file on the stack and
* sets some options. This routine doesn't use lex(), since lex() doesn't
* recognize file names (and directories).
*
* Global references: inpf (altered)
* inpfname (altered)
* fline (altered)
* lptr (altered)
*/
static void doinclude(void)
{
char name[_MAX_PATH],c;
int i, result;
while (*lptr<=' ' && *lptr!=0) /* skip leading whitespace */
lptr++;
if (*lptr=='<' || *lptr=='\"'){
c=(char)((*lptr=='\"') ? '\"' : '>'); /* termination character */
lptr++;
while (*lptr<=' ' && *lptr!=0) /* skip whitespace after quote */
lptr++;
} else {
c='\0';
} /* if */
i=0;
while (*lptr!=c && *lptr!='\0' && i<sizeof name - 1) /* find the end of the string */
name[i++]=*lptr++;
while (i>0 && name[i-1]<=' ')
i--; /* strip trailing whitespace */
assert(i>=0 && i<sizeof name);
name[i]='\0'; /* zero-terminate the string */
if (*lptr!=c) { /* verify correct string termination */
error(37); /* invalid string */
return;
} /* if */
if (c!='\0')
check_empty(lptr+1); /* verify that the rest of the line is whitespace */
/* Include files between "..." or without quotes are read from the current
* directory, or from a list of "include directories". Include files
* between <...> are only read from the list of include directories.
*/
result=plungefile(name,(c!='>'),TRUE);
if(!result)
error(100,name); /* cannot read from ... (fatal error) */
}
/* readline
*
* Reads in a new line from the input file pointed to by "inpf". readline()
* concatenates lines that end with a \ with the next line. If no more data
* can be read from the file, readline() attempts to pop off the previous file
* from the stack. If that fails too, it sets "freading" to 0.
*
* Global references: inpf,fline,inpfname,freading,icomment (altered)
*/
static void readline(char *line)
{
int i,num,cont;
char *ptr;
if (lptr==term_expr)
return;
num=sLINEMAX;
cont=FALSE;
do {
if (inpf==NULL || sc_eofsrc(inpf)) {
if (cont)
error(49); /* invalid line continuation */
if (inpf!=NULL && inpf!=inpf_org)
sc_closesrc(inpf);
i=(int)(long)popstk();
if (i==-1) { /* All's done; popstk() returns "stack is empty" */
freading=FALSE;
*line='\0';
/* when there is nothing more to read, the #if/#else stack should
* be empty and we should not be in a comment
*/
assert(iflevel>=0);
if (iflevel>0)
error(1,"#endif","-end of file-");
else if (icomment)
error(1,"*/","-end of file-");
return;
} /* if */
fline=i;
fcurrent=(int)(long)popstk();
icomment=(int)(long)popstk();
assert(skiplevel==0); /* skiplevel was not stored on stack, because it should always be zero at this point */
iflevel=(int)(long)popstk();
curlibrary=(constvalue *)popstk();
free(inpfname); /* return memory allocated for the include file name */
inpfname=(char *)popstk();
inpf=(FILE *)popstk();
setactivefile(fcurrent);
setfiledirect(inpfname);
listline=-1; /* force a #line directive when changing the file */
elsedone=0;
} /* if */
if (sc_readsrc(inpf,line,num)==NULL) {
*line='\0'; /* delete line */
cont=FALSE;
} else {
/* check whether to erase leading spaces */
if (cont) {
char *ptr=line;
while (*ptr==' ' || *ptr=='\t')
ptr++;
if (ptr!=line)
memmove(line,ptr,strlen(ptr)+1);
} /* if */
cont=FALSE;
/* check whether a full line was read */
if (strchr(line,'\n')==NULL && !sc_eofsrc(inpf))
error(75); /* line too long */
/* check if the next line must be concatenated to this line */
if ((ptr=strchr(line,'\n'))!=NULL && ptr>line) {
assert(*(ptr+1)=='\0'); /* '\n' should be last in the string */
while (ptr>line && (*ptr=='\n' || *ptr==' ' || *ptr=='\t'))
ptr--; /* skip trailing whitespace */
if (*ptr=='\\') {
cont=TRUE;
/* set '\a' at the position of '\\' to make it possible to check
* for a line continuation in a single line comment (error 49)
*/
*ptr++='\a';
*ptr='\0'; /* erase '\n' (and any trailing whitespace) */
} /* if */
} /* if */
num-=strlen(line);
line+=strlen(line);
} /* if */
fline+=1;
} while (num>=0 && cont);
}
/* stripcom
*
* Replaces all comments from the line by space characters. It updates
* a global variable ("icomment") for multiline comments.
*
* This routine also supports the C++ extension for single line comments.
* These comments are started with "//" and end at the end of the line.
*
* Global references: icomment (private to "stripcom")
*/
static void stripcom(char *line)
{
char c;
while (*line){
if (icomment){
if (*line=='*' && *(line+1)=='/') {
icomment=FALSE; /* comment has ended */
*line=' '; /* replace '*' and '/' characters by spaces */
*(line+1)=' ';
line+=2;
} else {
if (*line=='/' && *(line+1)=='*')
error(216); /* nested comment */
*line=' '; /* replace comments by spaces */
line+=1;
} /* if */
} else {
if (*line=='/' && *(line+1)=='*'){
icomment=TRUE; /* start comment */
*line=' '; /* replace '/' and '*' characters by spaces */
*(line+1)=' ';
line+=2;
} else if (*line=='/' && *(line+1)=='/'){ /* comment to end of line */
if (strchr(line,'\a')!=NULL)
error(49); /* invalid line continuation */
*line++='\n'; /* put "newline" at first slash */
*line='\0'; /* put "zero-terminator" at second slash */
} else {
if (*line=='\"' || *line=='\''){ /* leave literals unaltered */
c=*line; /* ending quote, single or double */
line+=1;
while ((*line!=c || *(line-1)=='\\') && *line!='\0')
line+=1;
line+=1; /* skip final quote */
} else {
line+=1;
} /* if */
} /* if */
} /* if */
} /* while */
}
/* btoi
*
* Attempts to interpret a numeric symbol as a boolean value. On success
* it returns the number of characters processed (so the line pointer can be
* adjusted) and the value is stored in "val". Otherwise it returns 0 and
* "val" is garbage.
*
* A boolean value must start with "0b"
*/
static int btoi(cell *val,char *curptr)
{
char *ptr;
*val=0;
ptr=curptr;
if (*ptr=='0' && *(ptr+1)=='b') {
ptr+=2;
while (*ptr=='0' || *ptr=='1' || *ptr=='_') {
if (*ptr!='_')
*val=(*val<<1) | (*ptr-'0');
ptr++;
} /* while */
} else {
return 0;
} /* if */
if (alphanum(*ptr)) /* number must be delimited by non-alphanumeric char */
return 0;
else
return (int)(ptr-curptr);
}
/* dtoi
*
* Attempts to interpret a numeric symbol as a decimal value. On success
* it returns the number of characters processed and the value is stored in
* "val". Otherwise it returns 0 and "val" is garbage.
*/
static int dtoi(cell *val,char *curptr)
{
char *ptr;
*val=0;
ptr=curptr;
if (!isdigit(*ptr)) /* should start with digit */
return 0;
while (isdigit(*ptr) || *ptr=='_') {
if (*ptr!='_')
*val=(*val*10)+(*ptr-'0');
ptr++;
} /* while */
if (alphanum(*ptr)) /* number must be delimited by non-alphanumerical */
return 0;
if (*ptr=='.' && isdigit(*(ptr+1)))
return 0; /* but a fractional part must not be present */
return (int)(ptr-curptr);
}
/* htoi
*
* Attempts to interpret a numeric symbol as a hexadecimal value. On
* success it returns the number of characters processed and the value is
* stored in "val". Otherwise it return 0 and "val" is garbage.
*/
static int htoi(cell *val,char *curptr)
{
char *ptr;
*val=0;
ptr=curptr;
if (!isdigit(*ptr)) /* should start with digit */
return 0;
if (*ptr=='0' && *(ptr+1)=='x') { /* C style hexadecimal notation */
ptr+=2;
while (ishex(*ptr) || *ptr=='_') {
if (*ptr!='_') {
assert(ishex(*ptr));
*val= *val<<4;
if (isdigit(*ptr))
*val+= (*ptr-'0');
else
*val+= (tolower(*ptr)-'a'+10);
} /* if */
ptr++;
} /* while */
} else {
return 0;
} /* if */
if (alphanum(*ptr))
return 0;
else
return (int)(ptr-curptr);
}
#if defined LINUX
static double pow10(int value)
{
double res=1.0;
while (value>=4) {
res*=10000.0;
value-=5;
} /* while */
while (value>=2) {
res*=100.0;
value-=2;
} /* while */
while (value>=1) {
res*=10.0;
value-=1;
} /* while */
return res;
}
#endif
/* ftoi
*
* Attempts to interpret a numeric symbol as a rational number, either as
* IEEE 754 single precision floating point or as a fixed point integer.
* On success it returns the number of characters processed and the value is
* stored in "val". Otherwise it returns 0 and "val" is unchanged.
*
* Small has stricter definition for floating point numbers than most:
* o the value must start with a digit; ".5" is not a valid number, you
* should write "0.5"
* o a period must appear in the value, even if an exponent is given; "2e3"
* is not a valid number, you should write "2.0e3"
* o at least one digit must follow the period; "6." is not a valid number,
* you should write "6.0"
*/
static int ftoi(cell *val,char *curptr)
{
char *ptr;
double fnum,ffrac,fmult;
unsigned long dnum,dbase;
int i, ignore;
assert(rational_digits>=0 && rational_digits<9);
for (i=0,dbase=1; i<rational_digits; i++)
dbase*=10;
fnum=0.0;
dnum=0L;
ptr=curptr;
if (!isdigit(*ptr)) /* should start with digit */
return 0;
while (isdigit(*ptr) || *ptr=='_') {
if (*ptr!='_') {
fnum=(fnum*10.0)+(*ptr-'0');
dnum=(dnum*10L)+(*ptr-'0')*dbase;
} /* if */
ptr++;
} /* while */
if (*ptr!='.')
return 0; /* there must be a period */
ptr++;
if (!isdigit(*ptr)) /* there must be at least one digit after the dot */
return 0;
ffrac=0.0;
fmult=1.0;
ignore=FALSE;
while (isdigit(*ptr) || *ptr=='_') {
if (*ptr!='_') {
ffrac=(ffrac*10.0)+(*ptr-'0');
fmult=fmult/10.0;
dbase /= 10L;
dnum += (*ptr-'0')*dbase;
if (dbase==0L && sc_rationaltag && rational_digits>0 && !ignore) {
error(222); /* number of digits exceeds rational number precision */
ignore=TRUE;
} /* if */
} /* if */
ptr++;
} /* while */
fnum += ffrac*fmult; /* form the number so far */
if (*ptr=='e') { /* optional fractional part */
int exp,sign;
ptr++;
if (*ptr=='-') {
sign=-1;
ptr++;
} else {
sign=1;
} /* if */
if (!isdigit(*ptr)) /* 'e' should be followed by a digit */
return 0;
exp=0;
while (isdigit(*ptr)) {
exp=(exp*10)+(*ptr-'0');
ptr++;
} /* while */
#if defined LINUX
fmult=pow10(exp*sign);
#else
fmult=pow(10,exp*sign);
#endif
fnum *= fmult;
dnum *= (unsigned long)(fmult+0.5);
} /* if */
/* decide how to store the number */
if (sc_rationaltag==0) {
error(70); /* rational number support was not enabled */
*val=0;
} else if (rational_digits==0) {
/* floating point */
float value=(float)fnum;
*val=*((cell *)&value);
#if !defined NDEBUG
/* I assume that the C/C++ compiler stores "float" values in IEEE 754
* format (as mandated in the ANSI standard). Test this assumption anyway.
*/
{ float test1 = 0.0, test2 = 50.0;
assert(*(long*)&test1==0x00000000L && *(long*)&test2==0x42480000L);
}
#endif
} else {
/* fixed point */
*val=(cell)dnum;
} /* if */
return (int)(ptr-curptr);
}
/* number
*
* Reads in a number (binary, decimal or hexadecimal). It returns the number
* of characters processed or 0 if the symbol couldn't be interpreted as a
* number (in this case the argument "val" remains unchanged). This routine
* relies on the 'early dropout' implementation of the logical or (||)
* operator.
*
* Note: the routine doesn't check for a sign (+ or -). The - is checked
* for at "hier2()" (in fact, it is viewed as an operator, not as a
* sign) and the + is invalid (as in K&R C, and unlike ANSI C).
*/
static int number(cell *val,char *curptr)
{
int i;
cell value;
if ((i=btoi(&value,curptr))!=0 /* binary? */
|| (i=htoi(&value,curptr))!=0 /* hexadecimal? */
|| (i=dtoi(&value,curptr))!=0) /* decimal? */
{
*val=value;
return i;
} else {
return 0; /* else not a number */
} /* if */
}
static void chrcat(char *str,char chr)
{
str=strchr(str,'\0');
*str++=chr;
*str='\0';
}
static int preproc_expr(cell *val,int *tag)
{
int result;
int index;
cell code_index;
char *term;
/* Disable staging; it should be disabled already because
* expressions may not be cut off half-way between conditional
* compilations. Reset the staging index, but keep the code
* index.
*/
if (stgget(&index,&code_index)) {
error(57); /* unfinished expression */
stgdel(0,code_index);
stgset(FALSE);
} /* if */
/* append a special symbol to the string, so the expression
* analyzer won't try to read a next line when it encounters
* an end-of-line
*/
assert(strlen(pline)<sLINEMAX);
term=strchr(pline,'\0');
assert(term!=NULL);
chrcat(pline,PREPROC_TERM); /* the "DEL" code (see SC.H) */
result=constexpr(val,tag); /* get value (or 0 on error) */
*term='\0'; /* erase the token (if still present) */
lexclr(FALSE); /* clear any "pushed" tokens */
return result;
}
/* getstring
* Returns returns a pointer behind the closing quote or to the other
* character that caused the input to be ended.
*/
static char *getstring(char *dest,int max,char *line)
{
assert(dest!=NULL && line!=NULL);
*dest='\0';
while (*line<=' ' && *line!='\0')
line++; /* skip whitespace */
if (*line!='"') {
error(37); /* invalid string */
} else if (*line=='\0') {
int len=0;
line++; /* skip " */
while (*line!='"' && *line!='\0') {
if (len<max-1)
dest[len++]=*line;
line++;
} /* if */
dest[len]='\0';
if (*line=='"')
lptr++; /* skip closing " */
else
error(37); /* invalid string */
} /* if */
return lptr;
}
enum {
CMD_NONE,
CMD_TERM,
CMD_EMPTYLINE,
CMD_CONDFALSE,
CMD_INCLUDE,
CMD_DEFINE,
CMD_IF,
CMD_DIRECTIVE,
};
/* command
*
* Recognizes the compiler directives. The function returns:
* CMD_NONE the line must be processed
* CMD_TERM a pending expression must be completed before processing further lines
* Other value: the line must be skipped, because:
* CMD_CONDFALSE false "#if.." code
* CMD_EMPTYLINE line is empty
* CMD_INCLUDE the line contains a #include directive
* CMD_DEFINE the line contains a #subst directive
* CMD_IF the line contains a #if/#else/#endif directive
* CMD_DIRECTIVE the line contains some other compiler directive
*
* Global variables: iflevel, skiplevel, elsedone (altered)
* lptr (altered)
*/
static int command(void)
{
int tok,ret;
cell val;
char *str;
int index;
cell code_index;
while (*lptr<=' ' && *lptr!='\0')
lptr+=1;
if (*lptr=='\0')
return CMD_EMPTYLINE; /* empty line */
if (*lptr!='#')
return skiplevel>0 ? CMD_CONDFALSE : CMD_NONE; /* it is not a compiler directive */
/* compiler directive found */
indent_nowarn=TRUE; /* allow loose indentation" */
lexclr(FALSE); /* clear any "pushed" tokens */
/* on a pending expression, force to return a silent ';' token and force to
* re-read the line
*/
if (!sc_needsemicolon && stgget(&index,&code_index)) {
lptr=term_expr;
return CMD_TERM;
} /* if */
tok=lex(&val,&str);
ret=skiplevel>0 ? CMD_CONDFALSE : CMD_DIRECTIVE; /* preset 'ret' to CMD_DIRECTIVE (most common case) */
switch (tok) {
case tpIF: /* conditional compilation */
ret=CMD_IF;
iflevel+=1;
if (skiplevel)
break; /* break out of switch */
preproc_expr(&val,NULL); /* get value (or 0 on error) */
if (!val)
skiplevel=iflevel;
check_empty(lptr);
break;
case tpELSE:
ret=CMD_IF;
if (iflevel==0 && skiplevel==0) {
error(26); /* no matching #if */
errorset(sRESET);
} else {
if (elsedone==iflevel)
error(60); /* multiple #else directives between #if ... #endif */
elsedone=iflevel;
if (skiplevel==iflevel)
skiplevel=0;
else if (skiplevel==0)
skiplevel=iflevel;
} /* if */
check_empty(lptr);
break;
#if 0 /* ??? *really* need to use a stack here */
case tpELSEIF:
ret=CMD_IF;
if (iflevel==0 && skiplevel==0) {
error(26); /* no matching #if */
errorset(sRESET);
} else if (elsedone==iflevel) {
error(61); /* #elseif directive may not follow an #else */
errorset(sRESET);
} else {
preproc_expr(&val,NULL); /* get value (or 0 on error) */
if (skiplevel==0)
skiplevel=iflevel; /* we weren't skipping, start skipping now */
else if (val)
skiplevel=0; /* we were skipping, condition is valid -> stop skipping */
/* else: we were skipping and condition is invalid -> keep skipping */
check_empty(lptr);
} /* if */
break;
#endif
case tpENDIF:
ret=CMD_IF;
if (iflevel==0 && skiplevel==0){
error(26);
errorset(sRESET);
} else {
if (skiplevel==iflevel)
skiplevel=0;
if (elsedone==iflevel)
elsedone=0; /* ??? actually, should build a stack of #if/#endif and keep
* the state whether an #else was seen per nesting level */
iflevel-=1;
} /* if */
check_empty(lptr);
break;
case tINCLUDE: /* #include directive */
ret=CMD_INCLUDE;
if (skiplevel==0)
doinclude();
break;
case tpFILE:
if (skiplevel==0) {
char pathname[_MAX_PATH];
lptr=getstring(pathname,sizeof pathname,lptr);
if (strlen(pathname)>0) {
free(inpfname);
inpfname=duplicatestring(pathname);
if (inpfname==NULL)
error(103); /* insufficient memory */
} /* if */
} /* if */
check_empty(lptr);
break;
case tpLINE:
if (skiplevel==0) {
if (lex(&val,&str)!=tNUMBER)
error(8); /* invalid/non-constant expression */
fline=(int)val;
} /* if */
check_empty(lptr);
break;
case tpASSERT:
if (skiplevel==0 && (sc_debug & sCHKBOUNDS)!=0) {
preproc_expr(&val,NULL); /* get constant expression (or 0 on error) */
if (!val)
error(7); /* assertion failed */
check_empty(lptr);
} /* if */
break;
case tpPRAGMA:
if (skiplevel==0) {
if (lex(&val,&str)==tSYMBOL) {
if (strcmp(str,"ctrlchar")==0) {
if (lex(&val,&str)!=tNUMBER)
error(27); /* invalid character constant */
sc_ctrlchar=(char)val;
} else if (strcmp(str,"compress")==0) {
cell val;
preproc_expr(&val,NULL);
sc_compress=(int)val; /* switch code packing on/off */
} else if (strcmp(str,"dynamic")==0) {
preproc_expr(&sc_stksize,NULL);
} else if (strcmp(str,"library")==0) {
char name[sNAMEMAX+1];
while (*lptr<=' ' && *lptr!='\0')
lptr++;
if (*lptr=='"') {
lptr=getstring(name,sizeof name,lptr);
} else {
int i;
for (i=0; i<sizeof name && alphanum(*lptr); i++,lptr++)
name[i]=*lptr;
name[i]='\0';
} /* if */
if (strlen(name)==0) {
curlibrary=NULL;
} else {
if (strlen(name)>sEXPMAX)
error(220,name,sEXPMAX); /* exported symbol is truncated */
/* add the name if it does not yet exist in the table */
if (find_constval(&libname_tab,name,0)==NULL)
curlibrary=append_constval(&libname_tab,name,0,0);
} /* if */
} else if (strcmp(str,"pack")==0) {
cell val;
preproc_expr(&val,NULL); /* default = packed/unpacked */
sc_packstr=(int)val;
} else if (strcmp(str,"rational")==0) {
char name[sNAMEMAX+1];
cell digits=0;
int i;
/* first gather all information, start with the tag name */
while (*lptr<=' ' && *lptr!='\0')
lptr++;
for (i=0; i<sizeof name && alphanum(*lptr); i++,lptr++)
name[i]=*lptr;
name[i]='\0';
/* then the precision (for fixed point arithmetic) */
while (*lptr<=' ' && *lptr!='\0')
lptr++;
if (*lptr=='(') {
preproc_expr(&digits,NULL);
if (digits<=0 || digits>9) {
error(68); /* invalid rational number precision */
digits=0;
} /* if */
if (*lptr==')')
lptr++;
} /* if */
/* add the tag (make it public) and check the values */
i=sc_addtag(name);
exporttag(i);
if (sc_rationaltag==0 || (sc_rationaltag==i && rational_digits==(int)digits)) {
sc_rationaltag=i;
rational_digits=(int)digits;
} else {
error(69); /* rational number format already set, can only be set once */
} /* if */
} else if (strcmp(str,"semicolon")==0) {
cell val;
preproc_expr(&val,NULL);
sc_needsemicolon=(int)val;
} else if (strcmp(str,"tabsize")==0) {
cell val;
preproc_expr(&val,NULL);
sc_tabsize=(int)val;
} else if (strcmp(str,"align")==0) {
sc_alignnext=TRUE;
} else if (strcmp(str,"unused")==0) {
char name[sNAMEMAX+1];
int i,comma;
symbol *sym;
do {
/* get the name */
while (*lptr<=' ' && *lptr!='\0')
lptr++;
for (i=0; i<sizeof name && isalpha(*lptr); i++,lptr++)
name[i]=*lptr;
name[i]='\0';
/* get the symbol */
sym=findloc(name);
if (sym==NULL)
sym=findglb(name);
if (sym!=NULL) {
sym->usage |= uREAD;
if (sym->ident==iVARIABLE || sym->ident==iREFERENCE
|| sym->ident==iARRAY || sym->ident==iREFARRAY)
sym->usage |= uWRITTEN;
} else {
error(17,name); /* undefined symbol */
} /* if */
/* see if a comma follows the name */
while (*lptr<=' ' && *lptr!='\0')
lptr++;
comma= (*lptr==',');
if (comma)
lptr++;
} while (comma);
} else {
error(207); /* unknown #pragma */
} /* if */
} else {
error(207); /* unknown #pragma */
} /* if */
check_empty(lptr);
} /* if */
break;
case tpENDINPUT:
case tpENDSCRPT:
if (skiplevel==0) {
check_empty(lptr);
assert(inpf!=NULL);
if (inpf!=inpf_org)
sc_closesrc(inpf);
inpf=NULL;
} /* if */
break;
#if !defined NOEMIT
case tpEMIT: {
/* write opcode to output file */
char name[40];
int i;
while (*lptr<=' ' && *lptr!='\0')
lptr++;
for (i=0; i<40 && (isalpha(*lptr) || *lptr=='.'); i++,lptr++)
name[i]=(char)tolower(*lptr);
name[i]='\0';
stgwrite("\t");
stgwrite(name);
stgwrite(" ");
code_idx+=opcodes(1);
/* write parameter (if any) */
while (*lptr<=' ' && *lptr!='\0')
lptr++;
if (*lptr!='\0') {
symbol *sym;
tok=lex(&val,&str);
switch (tok) {
case tNUMBER:
case tRATIONAL:
outval(val,FALSE);
code_idx+=opargs(1);
break;
case tSYMBOL:
sym=findloc(str);
if (sym==NULL)
sym=findglb(str);
if (sym==NULL || sym->ident!=iFUNCTN && sym->ident!=iREFFUNC && (sym->usage & uDEFINE)==0) {
error(17,str); /* undefined symbol */
} else {
outval(sym->addr,FALSE);
/* mark symbol as "used", unknown whether for read or write */
markusage(sym,uREAD | uWRITTEN);
code_idx+=opargs(1);
} /* if */
break;
default: {
char s2[20];
extern char *sc_tokens[];/* forward declaration */
if (tok<256)
sprintf(s2,"%c",(char)tok);
else
strcpy(s2,sc_tokens[tok-tFIRST]);
error(1,sc_tokens[tSYMBOL-tFIRST],s2);
break;
} /* case */
} /* switch */
} /* if */
stgwrite("\n");
check_empty(lptr);
break;
} /* case */
#endif
#if !defined NO_DEFINE
case tpDEFINE: {
ret=CMD_DEFINE;
if (skiplevel==0) {
char *pattern,*substitution;
char *start,*end;
int count,prefixlen;
stringpair *def;
/* find the pattern to match */
while (*lptr<=' ' && *lptr!='\0')
lptr++;
start=lptr; /* save starting point of the match pattern */
count=0;
while (*lptr>' ' && *lptr!='\0') {
litchar(&lptr,FALSE); /* litchar() advances "lptr" and handles escape characters */
count++;
} /* while */
end=lptr;
/* check pattern to match */
if (!isalpha(*start) && *start!='_') {
error(74); /* pattern must start with an alphabetic character */
break;
} /* if */
/* store matched pattern */
pattern=malloc(count+1);
if (pattern==NULL)
error(103); /* insufficient memory */
lptr=start;
count=0;
while (lptr!=end) {
assert(lptr<end);
assert(*lptr!='\0');
pattern[count++]=(char)litchar(&lptr,FALSE);
} /* while */
pattern[count]='\0';
/* special case, erase trailing variable, because it could match anything */
if (count>=2 && isdigit(pattern[count-1]) && pattern[count-2]=='%')
pattern[count-2]='\0';
/* find substitution string */
while (*lptr<=' ' && *lptr!='\0')
lptr++;
start=lptr; /* save starting point of the match pattern */
count=0;
end=NULL;
while (*lptr!='\0') {
/* keep position of the start of trailing whitespace */
if (*lptr<=' ') {
if (end==NULL)
end=lptr;
} else {
end=NULL;
} /* if */
count++;
lptr++;
} /* while */
if (end==NULL)
end=lptr;
/* store matched substitution */
substitution=malloc(count+1); /* +1 for '\0' */
if (substitution==NULL)
error(103); /* insufficient memory */
lptr=start;
count=0;
while (lptr!=end) {
assert(lptr<end);
assert(*lptr!='\0');
substitution[count++]=*lptr++;
} /* while */
substitution[count]='\0';
/* check whether the definition already exists */
for (prefixlen=0,start=pattern; isalpha(*start) || isdigit(*start) || *start=='_'; prefixlen++,start++)
/* nothing */;
assert(prefixlen>0);
if ((def=find_subst(pattern,prefixlen))!=NULL) {
if (strcmp(def->first,pattern)!=0 || strcmp(def->second,substitution)!=0)
error(201,pattern); /* redefinition of macro (non-identical) */
delete_subst(pattern,prefixlen);
} /* if */
/* add the pattern/substitution pair to the list */
assert(strlen(pattern)>0);
insert_subst(pattern,substitution,prefixlen);
free(pattern);
free(substitution);
} /* if */
break;
} /* case */
case tpUNDEF:
if (skiplevel==0) {
if (lex(&val,&str)==tSYMBOL) {
if (!delete_subst(str,strlen(str)))
error(17,str); /* undefined symbol */
} else {
error(20,str); /* invalid symbol name */
} /* if */
check_empty(lptr);
} /* if */
break;
#endif
default:
error(31); /* unknown compiler directive */
ret=skiplevel>0 ? CMD_DIRECTIVE : CMD_NONE; /* line must be processed (if skiplevel==0) */
} /* switch */
return ret;
}
#if !defined NO_DEFINE
static int is_startstring(char *string)
{
if (*string=='\"' || *string=='\'')
return TRUE; /* "..." */
if (*string=='!') {
string++;
if (*string=='\"' || *string=='\'')
return TRUE; /* !"..." */
if (*string==sc_ctrlchar) {
string++;
if (*string=='\"' || *string=='\'')
return TRUE; /* !\"..." */
} /* if */
} else if (*string==sc_ctrlchar) {
string++;
if (*string=='\"' || *string=='\'')
return TRUE; /* \"..." */
if (*string=='!') {
string++;
if (*string=='\"' || *string=='\'')
return TRUE; /* \!"..." */
} /* if */
} /* if */
return FALSE;
}
static char *skipstring(char *string)
{
char endquote;
int rawstring=FALSE;
while (*string=='!' || *string==sc_ctrlchar) {
rawstring= (*string==sc_ctrlchar);
string++;
} /* while */
endquote=*string;
assert(endquote=='"' || endquote=='\'');
string++; /* skip open quote */
while (*string!=endquote && *string!='\0')
litchar(&string,rawstring);
return string;
}
static char *skippgroup(char *string)
{
int nest=0;
char open=*string;
char close;
switch (open) {
case '(':
close=')';
break;
case '{':
close='}';
break;
case '[':
close=']';
break;
case '<':
close='>';
break;
default:
assert(0);
close='\0'; /* only to avoid a compiler warning */
}/* switch */
string++;
while (*string!=close || nest>0) {
if (*string==open)
nest++;
else if (*string==close)
nest--;
else if (is_startstring(string))
string=skipstring(string);
if (*string=='\0')
break;
string++;
} /* while */
return string;
}
static char *strdel(char *str,size_t len)
{
size_t length=strlen(str);
if (len>length)
len=length;
memmove(str, str+len, length-len+1); /* include EOS byte */
return str;
}
static char *strins(char *dest,char *src,size_t srclen)
{
size_t destlen=strlen(dest);
assert(srclen<=strlen(src));
memmove(dest+srclen, dest, destlen+1);/* include EOS byte */
memcpy(dest, src, srclen);
return dest;
}
static int substpattern(char *line,size_t buffersize,char *pattern,char *substitution)
{
int prefixlen;
char *p,*s,*e,*args[10];
int match,arg,len;
memset(args,0,sizeof args);
/* check the length of the prefix */
for (prefixlen=0,s=pattern; isalpha(*s) || isdigit(*s) || *s=='_'; prefixlen++,s++)
/* nothing */;
assert(prefixlen>0);
assert(strncmp(line,pattern,prefixlen)==0);
/* pattern prefix matches; match the rest of the pattern, gather
* the parameters
*/
s=line+prefixlen;
p=pattern+prefixlen;
match=TRUE; /* so far, pattern matches */
while (match && *s!='\0' && *p!='\0') {
if (*p=='%') {
p++; /* skip '%' */
if (isdigit(*p)) {
arg=*p-'0';
assert(arg>=0 && arg<=9);
p++; /* skip parameter id */
assert(*p!='\0');
/* match the source string up to the character after the digit
* (skipping strings in the process
*/
e=s;
while (*e!=*p && *e!='\0' && *e!='\n') {
if (is_startstring(e)) /* skip strings */
e=skipstring(e);
else if (strchr("({[",*e)!=NULL) /* skip parenthized groups */
e=skippgroup(e);
if (*e!='\0')
e++; /* skip non-alphapetic character (or closing quote of
* a string, or the closing paranthese of a group) */
} /* while */
/* store the parameter (overrule any earlier) */
if (args[arg]!=NULL)
free(args[arg]);
len=(int)(e-s);
args[arg]=malloc(len+1);
if (args[arg]==NULL)
error(103); /* insufficient memory */
strncpy(args[arg],s,len);
args[arg][len]='\0';
/* character behind the pattern was matched too */
if (*e==*p) {
s=e+1;
} else if (*e=='\n' && *p==';' && *(p+1)=='\0' && !sc_needsemicolon) {
s=e; /* allow a trailing ; in the pattern match to end of line */
} else {
assert(*e=='\0' || *e=='\n');
match=FALSE;
s=e;
} /* if */
p++;
} else {
match=FALSE;
} /* if */
} else if (*p==';' && *(p+1)=='\0' && !sc_needsemicolon) {
/* source may be ';' or end of the line */
while (*s<=' ' && *s!='\0')
s++; /* skip white space */
if (*s!=';' && *s!='\0')
match=FALSE;
p++; /* skip the semicolon in the pattern */
} else {
cell ch;
/* skip whitespace between two non-alphanumeric characters, except
* for two identical symbols
*/
assert(p>pattern);
if (!alphanum(*p) && *(p-1)!=*p)
while (*s<=' ' && *s!='\0')
s++; /* skip white space */
ch=litchar(&p,FALSE); /* this increments "p" */
if (*s!=ch)
match=FALSE;
else
s++; /* this character matches */
} /* if */
} /* while */
if (match && *p=='\0') {
/* if the last character to match is an alphanumeric character, the
* current character in the source may not be alphanumeric
*/
assert(p>pattern);
if (alphanum(*(p-1)) && alphanum(*s))
match=FALSE;
} /* if */
if (match) {
/* calculate the length of the substituted string */
for (e=substitution,len=0; *e!='\0'; e++) {
if (*e=='%' && isdigit(*(e+1))) {
arg=*(e+1)-'0';
assert(arg>=0 && arg<=9);
if (args[arg]!=NULL)
len+=strlen(args[arg]);
e++; /* skip %, digit is skipped later */
} else {
len++;
} /* if */
} /* for */
/* check length of the string after substitution */
if (strlen(line) + len - (int)(s-line) > buffersize) {
error(75); /* line too long */
} else {
/* substitute pattern */
strdel(line,(int)(s-line));
for (e=substitution,s=line; *e!='\0'; e++) {
if (*e=='%' && isdigit(*(e+1))) {
arg=*(e+1)-'0';
assert(arg>=0 && arg<=9);
if (args[arg]!=NULL) {
strins(s,args[arg],strlen(args[arg]));
s+=strlen(args[arg]);
} /* if */
e++; /* skip %, digit is skipped later */
} else {
strins(s,e,1);
s++;
} /* if */
} /* for */
} /* if */
} /* if */
for (arg=0; arg<10; arg++)
if (args[arg]!=NULL)
free(args[arg]);
return match;
}
static void substallpatterns(char *line,int buffersize)
{
char *start, *end;
int prefixlen;
stringpair *subst;
start=line;
while (*start!='\0') {
/* find the start of a prefix (skip all non-alphabetic characters),
* also skip strings
*/
while (!isalpha(*start) && *start!='_' && *start!='\0') {
/* skip strings */
if (is_startstring(start)) {
start=skipstring(start);
if (*start=='\0')
break; /* abort loop on error */
} /* if */
start++; /* skip non-alphapetic character (or closing quote of a string) */
} /* while */
if (*start=='\0')
break; /* abort loop on error */
/* get the prefix (length), look for a matching definition */
prefixlen=0;
end=start;
while (isalpha(*end) || isdigit(*end) || *end=='_') {
prefixlen++;
end++;
} /* while */
assert(prefixlen>0);
subst=find_subst(start,prefixlen);
if (subst!=NULL) {
/* properly match the pattern and substitute */
if (!substpattern(start,buffersize-(start-line),subst->first,subst->second))
start=end; /* match failed, skip this prefix */
/* match succeeded: do not update "start", because the substitution text
* may be matched by other macros
*/
} else {
start=end; /* no macro with this prefix, skip this prefix */
} /* if */
} /* while */
}
#endif
/* preprocess
*
* Reads a line by readline() into "pline" and performs basic preprocessing:
* deleting comments, skipping lines with false "#if.." code and recognizing
* other compiler directives. There is an indirect recursion: lex() calls
* preprocess() if a new line must be read, preprocess() calls command(),
* which at his turn calls lex() to identify the token.
*
* Global references: lptr (altered)
* pline (altered)
* freading (referred to only)
*/
SC_FUNC void preprocess(void)
{
int iscommand;
if (!freading)
return;
do {
readline(pline);
stripcom(pline); /* ??? no need for this when reading back from list file (in the second pass) */
lptr=pline; /* set "line pointer" to start of the parsing buffer */
iscommand=command();
if (iscommand!=CMD_NONE)
errorset(sRESET); /* reset error flag ("panic mode") on empty line or directive */
#if !defined NO_DEFINE
if (iscommand==CMD_NONE) {
assert(lptr!=term_expr);
substallpatterns(pline,sLINEMAX);
lptr=pline; /* reset "line pointer" to start of the parsing buffer */
} /* if */
#endif
if (sc_status==statFIRST && sc_listing && freading
&& (iscommand==CMD_NONE || iscommand==CMD_EMPTYLINE || iscommand==CMD_DIRECTIVE))
{
listline++;
if (fline!=listline) {
listline=fline;
setlinedirect(fline);
} /* if */
if (iscommand==CMD_EMPTYLINE)
fputs("\n",outf);
else
fputs(pline,outf);
} /* if */
} while (iscommand!=CMD_NONE && iscommand!=CMD_TERM && freading); /* enddo */
}
static char *unpackedstring(char *lptr,int rawstring)
{
while (*lptr!='\"' && *lptr!='\0') {
if (*lptr=='\a') { /* ignore '\a' (which was inserted at a line concatenation) */
lptr++;
continue;
} /* if */
stowlit(litchar(&lptr,rawstring)); /* litchar() alters "lptr" */
} /* while */
stowlit(0); /* terminate string */
return lptr;
}
static char *packedstring(char *lptr,int rawstring)
{
int i;
ucell val,c;
i=sizeof(ucell)-(charbits/8); /* start at most significant byte */
val=0;
while (*lptr!='\"' && *lptr!='\0') {
if (*lptr=='\a') { /* ignore '\a' (which was inserted at a line concatenation) */
lptr++;
continue;
} /* if */
c=litchar(&lptr,rawstring); /* litchar() alters "lptr" */
if (c>=(ucell)(1 << charbits))
error(43); /* character constant exceeds range */
val |= (c << 8*i);
if (i==0) {
stowlit(val);
val=0;
} /* if */
i=(i+sizeof(ucell)-(charbits/8)) % sizeof(ucell);
} /* if */
/* save last code; make sure there is at least one terminating zero character */
if (i!=(int)(sizeof(ucell)-(charbits/8)))
stowlit(val); /* at least one zero character in "val" */
else
stowlit(0); /* add full cell of zeros */
return lptr;
}
/* lex(lexvalue,lexsym) Lexical Analysis
*
* lex() first deletes leading white space, then checks for multi-character
* operators, keywords (including most compiler directives), numbers,
* labels, symbols and literals (literal characters are converted to a number
* and are returned as such). If every check fails, the line must contain
* a single-character operator. So, lex() returns this character. In the other
* case (something did match), lex() returns the number of the token. All
* these tokens have been assigned numbers above 255.
*
* Some tokens have "attributes":
* tNUMBER the value of the number is return in "lexvalue".
* tRATIONAL the value is in IEEE 754 encoding or in fixed point
* encoding in "lexvalue".
* tSYMBOL the first sNAMEMAX characters of the symbol are
* stored in a buffer, a pointer to this buffer is
* returned in "lexsym".
* tLABEL the first sNAMEMAX characters of the label are
* stored in a buffer, a pointer to this buffer is
* returned in "lexsym".
* tSTRING the string is stored in the literal pool, the index
* in the literal pool to this string is stored in
* "lexvalue".
*
* lex() stores all information (the token found and possibly its attribute)
* in global variables. This allows a token to be examined twice. If "_pushed"
* is true, this information is returned.
*
* Global references: lptr (altered)
* fline (referred to only)
* litidx (referred to only)
* _lextok, _lexval, _lexstr
* _pushed
*/
static int _pushed;
static int _lextok;
static cell _lexval;
static char _lexstr[sLINEMAX+1];
static int _lexnewline;
SC_FUNC void lexinit(void)
{
stkidx=0; /* index for pushstk() and popstk() */
iflevel=0; /* preprocessor: nesting of "#if" */
skiplevel=0; /* preprocessor: skipping lines or compiling lines */
icomment=FALSE; /* currently not in a multiline comment */
_pushed=FALSE; /* no token pushed back into lex */
_lexnewline=FALSE;
}
char *sc_tokens[] = {
"*=", "/=", "%=", "+=", "-=", "<<=", ">>>=", ">>=", "&=", "^=", "|=",
"||", "&&", "==", "!=", "<=", ">=", "<<", ">>>", ">>", "++", "--",
"...", "..",
"assert", "break", "case", "char", "const", "continue", "default",
"defined", "do", "else", "enum", "exit", "for", "forward", "goto",
"if", "native", "new", "operator", "public", "return", "sizeof",
"sleep", "static", "stock", "switch", "tagof", "while",
"#assert", "#define", "#else", "#emit", "#endif", "#endinput",
"#endscript", "#file", "#if", "#include", "#line", "#pragma", "#undef",
";", ";", "-integer value-", "-rational value-", "-identifier-",
"-label-", "-string-"
};
SC_FUNC int lex(cell *lexvalue,char **lexsym)
{
int i,toolong,newline,rawstring;
char **tokptr;
if (_pushed) {
_pushed=FALSE; /* reset "_pushed" flag */
*lexvalue=_lexval;
*lexsym=_lexstr;
return _lextok;
} /* if */
_lextok=0; /* preset all values */
_lexval=0;
_lexstr[0]='\0';
*lexvalue=_lexval;
*lexsym=_lexstr;
_lexnewline=FALSE;
if (!freading)
return 0;
newline= (lptr==pline); /* does lptr point to start of line buffer */
while (*lptr<=' ') { /* delete leading white space */
if (*lptr=='\0') {
preprocess(); /* preprocess resets "lptr" */
if (!freading)
return 0;
if (lptr==term_expr) /* special sequence to terminate a pending expression */
return (_lextok=tENDEXPR);
_lexnewline=TRUE; /* set this after preprocess(), because
* preprocess() calls lex() recursively */
newline=TRUE;
} else {
lptr+=1;
} /* if */
} /* while */
if (newline) {
stmtindent=0;
for (i=0; i<(int)(lptr-pline); i++)
if (pline[i]=='\t' && sc_tabsize>0)
stmtindent += (int)(sc_tabsize - (stmtindent+sc_tabsize) % sc_tabsize);
else
stmtindent++;
} /* if */
i=tFIRST;
tokptr=sc_tokens;
while (i<=tMIDDLE) { /* match multi-character operators */
if (match(*tokptr,FALSE)) {
_lextok=i;
return _lextok;
} /* if */
i+=1;
tokptr+=1;
} /* while */
while (i<=tLAST) { /* match reserved words and compiler directives */
if (match(*tokptr,TRUE)) {
_lextok=i;
errorset(sRESET); /* reset error flag (clear the "panic mode")*/
return _lextok;
} /* if */
i+=1;
tokptr+=1;
} /* while */
if ((i=number(&_lexval,lptr))!=0) { /* number */
_lextok=tNUMBER;
*lexvalue=_lexval;
lptr+=i;
} else if ((i=ftoi(&_lexval,lptr))!=0) {
_lextok=tRATIONAL;
*lexvalue=_lexval;
lptr+=i;
} else if (alpha(*lptr)) { /* symbol or label */
/* Note: only sNAMEMAX characters are significant. The compiler
* generates a warning if a symbol exceeds this length.
*/
_lextok=tSYMBOL;
i=0;
toolong=0;
while (alphanum(*lptr)){
_lexstr[i]=*lptr;
lptr+=1;
if (i<sNAMEMAX)
i+=1;
else
toolong=1;
} /* while */
_lexstr[i]='\0';
if (toolong)
error(200,_lexstr,sNAMEMAX); /* symbol too long, truncated to sNAMEMAX chars */
if (_lexstr[0]==PUBLIC_CHAR && _lexstr[1]=='\0') {
_lextok=PUBLIC_CHAR; /* '@' all alone is not a symbol, it is an operator */
} else if (_lexstr[0]=='_' && _lexstr[1]=='\0') {
_lextok='_'; /* '_' by itself is not a symbol, it is a placeholder */
} /* if */
if (*lptr==':' && sc_allowtags && _lextok!=PUBLIC_CHAR) {
_lextok=tLABEL; /* it wasn't a normal symbol, it was a label/tagname */
lptr+=1; /* skip colon */
} /* if */
} else if (*lptr=='\"' || *lptr==sc_ctrlchar && *(lptr+1)=='\"')
{ /* unpacked string literal */
_lextok=tSTRING;
rawstring= (*lptr==sc_ctrlchar);
*lexvalue=_lexval=litidx;
lptr+=1; /* skip double quote */
if (rawstring)
lptr+=1; /* skip "escape" character too */
lptr=sc_packstr ? packedstring(lptr,rawstring) : unpackedstring(lptr,rawstring);
if (*lptr=='\"')
lptr+=1; /* skip final quote */
else
error(37); /* invalid (non-terminated) string */
} else if (*lptr=='!' && *(lptr+1)=='\"'
|| *lptr=='!' && *(lptr+1)==sc_ctrlchar && *(lptr+2)=='\"'
|| *lptr==sc_ctrlchar && *(lptr+1)=='!' && *(lptr+2)=='\"')
{ /* packed string literal */
_lextok=tSTRING;
rawstring= (*lptr==sc_ctrlchar || *(lptr+1)==sc_ctrlchar);
*lexvalue=_lexval=litidx;
lptr+=2; /* skip exclamation point and double quote */
if (rawstring)
lptr+=1; /* skip "escape" character too */
lptr=sc_packstr ? unpackedstring(lptr,rawstring) : packedstring(lptr,rawstring);
if (*lptr=='\"')
lptr+=1; /* skip final quote */
else
error(37); /* invalid (non-terminated) string */
} else if (*lptr=='\'') { /* character literal */
lptr+=1; /* skip quote */
_lextok=tNUMBER;
*lexvalue=_lexval=litchar(&lptr,FALSE);
if (*lptr=='\'')
lptr+=1; /* skip final quote */
else
error(27); /* invalid character constant (must be one character) */
} else if (*lptr==';') { /* semicolumn resets "error" flag */
_lextok=';';
lptr+=1;
errorset(sRESET); /* reset error flag (clear the "panic mode")*/
} else {
_lextok=*lptr; /* if every match fails, return the character */
lptr+=1; /* increase the "lptr" pointer */
} /* if */
return _lextok;
}
/* lexpush
*
* Pushes a token back, so the next call to lex() will return the token
* last examined, instead of a new token.
*
* Only one token can be pushed back.
*
* In fact, lex() already stores the information it finds into global
* variables, so all that is to be done is set a flag that informs lex()
* to read and return the information from these variables, rather than
* to read in a new token from the input file.
*/
SC_FUNC void lexpush(void)
{
assert(_pushed==FALSE);
_pushed=TRUE;
}
/* lexclr
*
* Sets the variable "_pushed" to 0 to make sure lex() will read in a new
* symbol (a not continue with some old one). This is required upon return
* from Assembler mode.
*/
SC_FUNC void lexclr(int clreol)
{
_pushed=FALSE;
if (clreol) {
lptr=strchr(pline,'\0');
assert(lptr!=NULL);
} /* if */
}
/* matchtoken
*
* This routine is useful if only a simple check is needed. If the token
* differs from the one expected, it is pushed back.
*/
SC_FUNC int matchtoken(int token)
{
cell val;
char *str;
int tok;
tok=lex(&val,&str);
if (tok==token || token==tTERM && (tok==';' || tok==tENDEXPR)) {
return 1;
} else if (!sc_needsemicolon && token==tTERM && (_lexnewline || !freading)) {
lexpush(); /* push "tok" back, we use the "hidden" newline token */
return 1;
} else {
lexpush();
return 0;
} /* if */
}
/* tokeninfo
*
* Returns additional information of a token after using "matchtoken()"
* or needtoken(). It does no harm using this routine after a call to
* "lex()", but lex() already returns the same information.
*
* The token itself is the return value. Normally, this one is already known.
*/
SC_FUNC int tokeninfo(cell *val,char **str)
{
/* if the token was pushed back, tokeninfo() returns the token and
* parameters of the *next* token, not of the *current* token.
*/
assert(!_pushed);
*val=_lexval;
*str=_lexstr;
return _lextok;
}
/* needtoken
*
* This routine checks for a required token and gives an error message if
* it isn't there (and returns FALSE in that case).
*
* Global references: _lextok;
*/
SC_FUNC int needtoken(int token)
{
char s1[20],s2[20];
if (matchtoken(token)) {
return TRUE;
} else {
/* token already pushed back */
assert(_pushed);
if (token<256)
sprintf(s1,"%c",(char)token); /* single character token */
else
strcpy(s1,sc_tokens[token-tFIRST]); /* multi-character symbol */
if (!freading)
strcpy(s2,"-end of file-");
else if (_lextok<256)
sprintf(s2,"%c",(char)_lextok);
else
strcpy(s2,sc_tokens[_lextok-tFIRST]);
error(1,s1,s2); /* expected ..., but found ... */
return FALSE;
} /* if */
}
/* match
*
* Compares a series of characters from the input file with the characters
* in "st" (that contains a token). If the token on the input file matches
* "st", the input file pointer "lptr" is adjusted to point to the next
* token, otherwise "lptr" remains unaltered.
*
* If the parameter "end: is true, match() requires that the first character
* behind the recognized token is non-alphanumeric.
*
* Global references: lptr (altered)
*/
static int match(char *st,int end)
{
int k;
char *ptr;
k=0;
ptr=lptr;
while (st[k]) {
if (st[k]!=*ptr)
return 0;
k+=1;
ptr+=1;
} /* while */
if (end) { /* symbol must terminate with non-alphanumeric char */
if (alphanum(*ptr))
return 0;
} /* if */
lptr=ptr; /* match found, skip symbol */
return 1;
}
/* stowlit
*
* Stores a value into the literal queue. The literal queue is used for
* literal strings used in functions and for initializing array variables.
*
* Global references: litidx (altered)
* litq (altered)
*/
SC_FUNC void stowlit(cell value)
{
if (litidx>=litmax) {
cell *p;
litmax+=sDEF_LITMAX;
p=(cell *)realloc(litq,litmax*sizeof(cell));
if (p==NULL)
error(102,"literal table"); /* literal table overflow (fatal error) */
litq=p;
} /* if */
assert(litidx<litmax);
litq[litidx++]=value;
}
/* litchar
*
* Return current literal character and increase the pointer to point
* just behind this literal character.
*
* Note: standard "escape sequences" are suported, but the backslash may be
* replaced by another character; the syntax '\ddd' is supported,
* but ddd must be decimal!
*/
static cell litchar(char **lptr,int rawmode)
{
cell c=0;
unsigned char *cptr;
cptr=(unsigned char *)*lptr;
if (rawmode || *cptr!=sc_ctrlchar) { /* no escape character */
c=*cptr;
cptr+=1;
} else {
cptr+=1;
if (*cptr==sc_ctrlchar) {
c=*cptr; /* \\ == \ (the escape character itself) */
cptr+=1;
} else {
switch (*cptr) {
case 'a': /* \a == audible alarm */
c=7;
cptr+=1;
break;
case 'b': /* \b == backspace */
c=8;
cptr+=1;
break;
case 'e': /* \e == escape */
c=27;
cptr+=1;
break;
case 'f': /* \f == form feed */
c=12;
cptr+=1;
break;
case 'n': /* \n == NewLine character */
c=10;
cptr+=1;
break;
case 'r': /* \r == carriage return */
c=13;
cptr+=1;
break;
case 't': /* \t == horizontal TAB */
c=9;
cptr+=1;
break;
case 'v': /* \v == vertical TAB */
c=11;
cptr+=1;
break;
case '\'': /* \' == ' (single quote) */
case '"': /* \" == " (single quote) */
case '%': /* \% == % (percent) */
c=*cptr;
cptr+=1;
break;
default:
if (isdigit(*cptr)) { /* \ddd */
c=0;
while (*cptr>='0' && *cptr<='9') /* decimal! */
c=c*10 + *cptr++ - '0';
if (*cptr==';')
cptr++; /* swallow a trailing ';' */
} else {
error(27); /* invalid character constant */
} /* if */
} /* switch */
} /* if */
} /* if */
*lptr=(char *)cptr;
assert(c>=0 && c<256);
return c;
}
/* alpha
*
* Test if character "c" is alphabetic ("a".."z"), an underscore ("_")
* or an "at" sign ("@"). The "@" is an extension to standard C.
*/
static int alpha(char c)
{
return (isalpha(c) || c=='_' || c==PUBLIC_CHAR);
}
/* alphanum
*
* Test if character "c" is alphanumeric ("a".."z", "0".."9", "_" or "@")
*/
SC_FUNC int alphanum(char c)
{
return (alpha(c) || isdigit(c));
}
/* ishex
*
* Test if character "c" is a hexadecimal digit ("0".."9" or "a".."f").
*/
SC_FUNC int ishex(char c)
{
return (c>='0' && c<='9') || (c>='a' && c<='f') || (c>='A' && c<='F');
}
/* The local variable table must be searched backwards, so that the deepest
* nesting of local variables is searched first. The simplest way to do
* this is to insert all new items at the head of the list.
* In the global list, the symbols are kept in sorted order, so that the
* public functions are written in sorted order.
*/
static symbol *add_symbol(symbol *root,symbol *entry,int sort)
{
symbol *newsym;
if (sort)
while (root->next!=NULL && strcmp(entry->name,root->next->name)>0)
root=root->next;
if ((newsym=(symbol *)malloc(sizeof(symbol)))==NULL) {
error(103);
return NULL;
} /* if */
memcpy(newsym,entry,sizeof(symbol));
newsym->next=root->next;
root->next=newsym;
return newsym;
}
static void free_symbol(symbol *sym)
{
arginfo *arg;
/* free all sub-symbol allocated memory blocks, depending on the
* kind of the symbol
*/
assert(sym!=NULL);
if (sym->ident==iFUNCTN) {
/* run through the argument list; "default array" arguments
* must be freed explicitly; the tag list must also be freed */
assert(sym->dim.arglist!=NULL);
for (arg=sym->dim.arglist; arg->ident!=0; arg++) {
if (arg->ident==iREFARRAY && arg->hasdefault)
free(arg->defvalue.array.data);
else if (arg->ident==iVARIABLE
&& ((arg->hasdefault & uSIZEOF)!=0 || (arg->hasdefault & uTAGOF)!=0))
free(arg->defvalue.size.symname);
assert(arg->tags!=NULL);
free(arg->tags);
} /* for */
free(sym->dim.arglist);
} /* if */
assert(sym->refer!=NULL);
free(sym->refer);
free(sym);
}
SC_FUNC void delete_symbol(symbol *root,symbol *sym)
{
/* find the symbol and its predecessor
* (this function assumes that you will never delete a symbol that is not
* in the table pointed at by "root")
*/
assert(root!=sym);
while (root->next!=sym) {
root=root->next;
assert(root!=NULL);
} /* while */
/* unlink it, then free it */
root->next=sym->next;
free_symbol(sym);
}
SC_FUNC void delete_symbols(symbol *root,int level,int delete_labels,int delete_functions)
{
symbol *sym;
/* erase only the symbols with a deeper nesting level than the
* specified nesting level */
while (root->next!=NULL) {
sym=root->next;
if (sym->compound<level)
break;
if ((delete_labels || sym->ident!=iLABEL)
&& (delete_functions || sym->ident!=iFUNCTN || (sym->usage & uNATIVE)!=0)
&& (delete_functions || sym->ident!=iCONSTEXPR || (sym->usage & uPREDEF)==0)
&& (delete_functions || (sym->ident!=iVARIABLE && sym->ident!=iARRAY)))
{
root->next=sym->next;
free_symbol(sym);
} else {
/* if the function was prototyped, but not implemented in this source,
* mark it as such, so that its use can be flagged
*/
if (sym->ident==iFUNCTN && (sym->usage & uDEFINE)==0)
sym->usage |= uMISSING;
if (sym->ident==iFUNCTN || sym->ident==iVARIABLE || sym->ident==iARRAY)
sym->usage &= ~uDEFINE; /* clear "defined" flag */
/* for user defined operators, also remove the "prototyped" flag, as
* user-defined operators *must* be declared before use
*/
if (sym->ident==iFUNCTN && !isalpha(*sym->name) && *sym->name!='_' && *sym->name!=PUBLIC_CHAR)
sym->usage &= ~uPROTOTYPED;
root=sym; /* skip the symbol */
} /* if */
} /* if */
}
/* The purpose of the hash is to reduce the frequency of a "name"
* comparison (which is costly). There is little interest in avoiding
* clusters in similar names, which is why this function is plain simple.
*/
SC_FUNC uint32_t namehash(char *name)
{
unsigned char *ptr=(unsigned char *)name;
int len=strlen(name);
if (len==0)
return 0L;
assert(len<256);
return (len<<24Lu) + (ptr[0]<<16Lu) + (ptr[len-1]<<8Lu) + (ptr[len>>1Lu]);
}
static symbol *find_symbol(symbol *root,char *name,int fnumber)
{
symbol *ptr=root->next;
unsigned long hash=namehash(name);
while (ptr!=NULL) {
if (hash==ptr->hash && strcmp(name,ptr->name)==0 && ptr->parent==NULL
&& (ptr->fnumber<0 || ptr->fnumber==fnumber))
return ptr;
ptr=ptr->next;
} /* while */
return NULL;
}
static symbol *find_symbol_child(symbol *root,symbol *sym)
{
symbol *ptr=root->next;
while (ptr!=NULL) {
if (ptr->parent==sym)
return ptr;
ptr=ptr->next;
} /* while */
return NULL;
}
/* Adds "bywhom" to the list of referrers of "entry". Typically,
* bywhom will be the function that uses a variable or that calls
* the function.
*/
SC_FUNC int refer_symbol(symbol *entry,symbol *bywhom)
{
int count;
assert(bywhom!=NULL); /* it makes no sense to add a "void" referrer */
assert(entry!=NULL);
assert(entry->refer!=NULL);
/* see if it is already there */
for (count=0; count<entry->numrefers && entry->refer[count]!=bywhom; count++)
/* nothing */;
if (count<entry->numrefers) {
assert(entry->refer[count]==bywhom);
return TRUE;
} /* if */
/* see if there is an empty spot in the referrer list */
for (count=0; count<entry->numrefers && entry->refer[count]!=NULL; count++)
/* nothing */;
assert(count <= entry->numrefers);
if (count==entry->numrefers) {
symbol **refer;
int newsize=2*entry->numrefers;
assert(newsize>0);
/* grow the referrer list */
refer=(symbol**)realloc(entry->refer,newsize*sizeof(symbol*));
if (refer==NULL)
return FALSE; /* insufficient memory */
/* initialize the new entries */
entry->refer=refer;
for (count=entry->numrefers; count<newsize; count++)
entry->refer[count]=NULL;
count=entry->numrefers; /* first empty spot */
entry->numrefers=newsize;
} /* if */
/* add the referrer */
assert(entry->refer[count]==NULL);
entry->refer[count]=bywhom;
return TRUE;
}
SC_FUNC void markusage(symbol *sym,int usage)
{
sym->usage |= (char)usage;
/* check if (global) reference must be added to the symbol */
if ((usage & (uREAD | uWRITTEN))!=0) {
/* only do this for global symbols */
if (sym->vclass==sGLOBAL) {
/* "curfunc" should always be valid, since statements may not occurs
* outside functions; in the case of syntax errors, however, the
* compiler may arrive through this function
*/
if (curfunc!=NULL)
refer_symbol(sym,curfunc);
} /* if */
} /* if */
}
/* findglb
*
* Returns a pointer to the global symbol (if found) or NULL (if not found)
*/
SC_FUNC symbol *findglb(char *name)
{
return find_symbol(&glbtab,name,fcurrent);
}
/* findloc
*
* Returns a pointer to the local symbol (if found) or NULL (if not found).
* See add_symbol() how the deepest nesting level is searched first.
*/
SC_FUNC symbol *findloc(char *name)
{
return find_symbol(&loctab,name,-1);
}
SC_FUNC symbol *findconst(char *name)
{
symbol *sym;
sym=find_symbol(&loctab,name,-1); /* try local symbols first */
if (sym==NULL || sym->ident!=iCONSTEXPR) /* not found, or not a constant */
sym=find_symbol(&glbtab,name,fcurrent);
if (sym==NULL || sym->ident!=iCONSTEXPR)
return NULL;
assert(sym->parent==NULL); /* constants have no hierarchy */
return sym;
}
SC_FUNC symbol *finddepend(symbol *parent)
{
symbol *sym;
sym=find_symbol_child(&loctab,parent); /* try local symbols first */
if (sym==NULL) /* not found */
sym=find_symbol_child(&glbtab,parent);
return sym;
}
/* addsym
*
* Adds a symbol to the symbol table (either global or local variables,
* or global and local constants).
*/
SC_FUNC symbol *addsym(char *name,cell addr,int ident,int vclass,int tag,int usage)
{
symbol entry, **refer;
/* global variables/constants/functions may only be defined once */
assert(!(ident==iFUNCTN || ident==iCONSTEXPR) || vclass!=sGLOBAL || findglb(name)==NULL);
/* labels may only be defined once */
assert(ident!=iLABEL || findloc(name)==NULL);
/* create an empty referrer list */
if ((refer=(symbol**)malloc(sizeof(symbol*)))==NULL) {
error(103); /* insufficient memory */
return NULL;
} /* if */
*refer=NULL;
/* first fill in the entry */
strcpy(entry.name,name);
entry.hash=namehash(name);
entry.addr=addr;
entry.vclass=(char)vclass;
entry.ident=(char)ident;
entry.tag=tag;
entry.usage=(char)usage;
entry.compound=0; /* may be overridden later */
entry.fnumber=-1; /* assume global visibility (ignored for local symbols) */
entry.numrefers=1;
entry.refer=refer;
entry.parent=NULL;
/* then insert it in the list */
if (vclass==sGLOBAL)
return add_symbol(&glbtab,&entry,TRUE);
else
return add_symbol(&loctab,&entry,FALSE);
}
SC_FUNC symbol *addvariable(char *name,cell addr,int ident,int vclass,int tag,
int dim[],int numdim,int idxtag[])
{
symbol *sym,*parent,*top;
int level;
/* global variables may only be defined once */
assert(vclass!=sGLOBAL || (sym=findglb(name))==NULL || (sym->usage & uDEFINE)==0);
if (ident==iARRAY || ident==iREFARRAY) {
parent=NULL;
sym=NULL; /* to avoid a compiler warning */
for (level=0; level<numdim; level++) {
top=addsym(name,addr,ident,vclass,tag,uDEFINE);
top->dim.array.length=dim[level];
top->dim.array.level=(short)(numdim-level-1);
top->x.idxtag=idxtag[level];
top->parent=parent;
parent=top;
if (level==0)
sym=top;
} /* for */
} else {
sym=addsym(name,addr,ident,vclass,tag,uDEFINE);
} /* if */
return sym;
}
/* getlabel
*
* Return next available internal label number.
*/
SC_FUNC int getlabel(void)
{
return labnum++;
}
/* itoh
*
* Converts a number to a hexadecimal string and returns a pointer to that
* string.
*/
SC_FUNC char *itoh(ucell val)
{
static char itohstr[15]; /* hex number is 10 characters long at most */
char *ptr;
int i,nibble[8]; /* a 32-bit hexadecimal cell has 8 nibbles */
int max;
#if defined(BIT16)
max=4;
#else
max=8;
#endif
ptr=itohstr;
for (i=0; i<max; i+=1){
nibble[i]=(int)(val & 0x0f); /* nibble 0 is lowest nibble */
val>>=4;
} /* endfor */
i=max-1;
while (nibble[i]==0 && i>0) /* search for highest non-zero nibble */
i-=1;
while (i>=0){
if (nibble[i]>=10)
*ptr++=(char)('a'+(nibble[i]-10));
else
*ptr++=(char)('0'+nibble[i]);
i-=1;
} /* while */
*ptr='\0'; /* and a zero-terminator */
return itohstr;
}
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