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codegen.c
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/*
* codegen - module to generate opcodes from the input tokens
*
* Copyright (C) 1999-2004 David I. Bell and Ernest Bowen
*
* Primary author: David I. Bell
*
* Calc is open software; you can redistribute it and/or modify it under
* the terms of the version 2.1 of the GNU Lesser General Public License
* as published by the Free Software Foundation.
*
* Calc is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
* Public License for more details.
*
* A copy of version 2.1 of the GNU Lesser General Public License is
* distributed with calc under the filename COPYING-LGPL. You should have
* received a copy with calc; if not, write to Free Software Foundation, Inc.
* 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
*
* @(#) $Revision: 29.9 $
* @(#) $Id: codegen.c,v 29.9 2004/02/23 14:04:01 chongo Exp $
* @(#) $Source: /usr/local/src/cmd/calc/RCS/codegen.c,v $
*
* Under source code control: 1990/02/15 01:48:13
* File existed as early as: before 1990
*
* Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
*/
#include <stdio.h>
#include "have_unistd.h"
#if defined(HAVE_UNISTD_H)
#include <unistd.h>
#endif
#include "calc.h"
#include "token.h"
#include "symbol.h"
/*#include "label.h" -TL*/
#include "opcodes.h"
/*#include "string.h" -TL*/
#include "func.h"
/*#include "conf.h" -TL*/
#if defined(_WIN32) && !defined(__CYGWIN__)
# include <direct.h>
#endif
static BOOL rdonce; /* TRUE => do not reread this file */
FUNC *curfunc;
static int getfilename(char *name, BOOL *once);
static BOOL getid(char *buf);
static void getshowstatement(void);
static void getfunction(void);
static void ungetfunction(void);
static void getbody(LABEL *contlabel, LABEL *breaklabel,
LABEL *nextcaselabel, LABEL *defaultlabel);
static int getdeclarations(int symtype);
static int getsimpledeclaration (int symtype);
static int getonevariable (int symtype);
static void getstatement(LABEL *contlabel, LABEL *breaklabel,
LABEL *nextcaselabel, LABEL *defaultlabel);
static void getobjdeclaration(int symtype);
static void getoneobj(long index, int symtype);
static void getobjvars(char *name, int symtype);
static void getmatdeclaration(int symtype);
static void getonematrix(int symtype);
static void creatematrix(void);
static void getsimplebody(void);
static void getcondition(void);
static void getmatargs(void);
static void getelement(void);
static void usesymbol(char *name, int autodef);
static void definesymbol(char *name, int symtype);
static void getcallargs(char *name);
static void do_changedir(void);
static int getexprlist(void);
static int getopassignment(void);
static int getassignment(void);
static int getaltcond(void);
static int getorcond(void);
static int getandcond(void);
static int getrelation(void);
static int getsum(void);
static int getproduct(void);
static int getorexpr(void);
static int getandexpr(void);
static int getshiftexpr(void);
static int getreference(void);
static int getincdecexpr(void);
static int getterm(void);
static int getidexpr(BOOL okmat, int autodef);
static long getinitlist(void);
#define INDICALLOC 8
static int quickindices[INDICALLOC];
static int * newindices;
static int * indices;
static int maxindices;
/*
* Read all the commands from an input file.
* These are either declarations, or else are commands to execute now.
* In general, commands are terminated by newlines or semicolons.
* Exceptions are function definitions and escaped newlines.
* Commands are read and executed until the end of file.
* The toplevel flag indicates whether we are at the top interactive level.
*/
void
getcommands(BOOL toplevel)
{
char name[MAXCMD+1+1]; /* program name */
/* firewall */
name[0] = '\0';
name[MAXCMD+1] = '\0';
abort_now = FALSE;
/* getcommands */
if (!toplevel)
enterfilescope();
for (;;) {
/*int i; -TL*/
(void) tokenmode(TM_NEWLINES);
switch (gettoken()) {
case T_DEFINE:
getfunction();
break;
case T_UNDEFINE:
ungetfunction();
break;
case T_EOF:
if (!toplevel)
exitfilescope();
return;
/*case T_HELP:
for (i=1;;i++) {
switch(getfilename(name, NULL)) {
case -1:
if(i == 1) {
strcpy(name, DEFAULTCALCHELP);
givehelp(name);
}
break;
case 0:
givehelp(name);
continue;
default:
break;
}
break;
}
break; -TL*/
case T_READ:
if (!allow_read) {
scanerror(T_NULL,
"read command disallowed by -m mode\n");
break;
}
for (;;) {
if (getfilename(name, &rdonce))
break;
switch (opensearchfile(name,calcpath,
CALCEXT,rdonce)) {
case 0:
getcommands(FALSE);
closeinput();
continue;
case 1:
/* prev read and -once was given */
continue;
case -2:
scanerror(T_NULL,
"Maximum input depth reached");
break;
default:
scanerror(T_NULL,
"Cannot open \"%s\"", name);
continue;
}
break;
}
break;
case T_WRITE:
if (!allow_write) {
scanerror(T_NULL,
"write command disallowed by -m mode\n");
break;
}
if (getfilename(name, NULL))
break;
if (writeglobals(name)) {
scanerror(T_NULL,
"Error writing \"%s\"\n", name);
}
break;
case T_CD:
do_changedir();
break;
case T_NEWLINE:
case T_SEMICOLON:
case T_POUNDBANG:
case T_POUNDCOMMENT:
break;
default:
rescantoken();
initstack();
if (evaluate(FALSE))
updateoldvalue(curfunc);
freefunc(curfunc);
if (abort_now) {
if (!stdin_tty)
run_state = RUN_EXIT;
else if (run_state < RUN_PRE_TOP_LEVEL)
run_state = RUN_PRE_TOP_LEVEL;
longjmp(jmpbuf, 1);
}
}
}
}
/*
* Evaluate a line of statements.
* This is done by treating the current line as a function body,
* compiling it, and then executing it. Returns TRUE if the line
* successfully compiled and executed. The last expression result
* is saved in the f_savedvalue element of the current function.
* The nestflag variable should be FALSE for the outermost evaluation
* level, and TRUE for all other calls (such as the 'eval' function).
* The function name begins with an asterisk to indicate specialness.
*
* given:
* nestflag TRUE if this is a nested evaluation
*/
BOOL
evaluate(BOOL nestflag)
{
char *funcname;
int loop = 1; /* 0 => end the main while loop */
funcname = (nestflag ? "**" : "*");
beginfunc(funcname, nestflag);
if (gettoken() == T_LEFTBRACE) {
getbody(NULL_LABEL, NULL_LABEL, NULL_LABEL, NULL_LABEL);
} else {
if (nestflag)
(void) tokenmode(TM_DEFAULT);
rescantoken();
while (loop) {
switch (gettoken()) {
case T_SEMICOLON:
break;
case T_NEWLINE:
case T_EOF:
loop = 0;
break;
default:
rescantoken();
getstatement(NULL_LABEL, NULL_LABEL,
NULL_LABEL, NULL_LABEL);
}
}
}
addop(OP_UNDEF);
addop(OP_RETURN);
checklabels();
if (errorcount)
return FALSE;
calculate(curfunc, 0);
return TRUE;
}
/*
* Undefine one or more functions
*/
static void
ungetfunction(void)
{
char *name;
int type;
for (;;) {
switch (gettoken()) {
case T_COMMA:
continue;
case T_SYMBOL:
name = tokensymbol();
type = getbuiltinfunc(name);
if (type >= 0) {
fprintf(stderr,
"Attempt to undefine builtin function \"%s\" ignored\n",
name);
continue;
}
rmuserfunc(name);
continue;
case T_MULT:
rmalluserfunc();
continue;
case T_NEWLINE:
case T_SEMICOLON:
case T_EOF:
rescantoken();
return;
default:
scanerror(T_SEMICOLON,
"Non-name arg for undefine");
return;
}
}
}
/*
* Get a function declaration.
* func = name '(' '' | name [ ',' name] ... ')' simplebody
* | name '(' '' | name [ ',' name] ... ')' body.
*/
static void
getfunction(void)
{
char *name; /* parameter name */
int type; /* type of token read */
LABEL label;
long index;
(void) tokenmode(TM_DEFAULT);
if (gettoken() != T_SYMBOL) {
scanerror(T_NULL, "Function name was expected");
return;
}
name = tokensymbol();
type = getbuiltinfunc(name);
if (type >= 0) {
scanerror(T_SEMICOLON, "Using builtin function name");
return;
}
beginfunc(name, FALSE);
enterfuncscope();
if (gettoken() != T_LEFTPAREN) {
scanerror(T_SEMICOLON,
"Left parenthesis expected for function");
return;
}
index = 0;
for (;;) {
type = gettoken();
if (type == T_RIGHTPAREN)
break;
if (type != T_SYMBOL) {
scanerror(T_COMMA, "Bad function definition");
return;
}
name = tokensymbol();
switch (symboltype(name)) {
case SYM_UNDEFINED:
case SYM_GLOBAL:
case SYM_STATIC:
index = addparam(name);
break;
default:
scanerror(T_NULL,
"Parameter \"%s\" is already defined",
name);
}
type = gettoken();
if (type == T_ASSIGN) {
clearlabel(&label);
addopone(OP_PARAMADDR, index);
addoplabel(OP_JUMPNN, &label);
getopassignment();
addop(OP_ASSIGNPOP);
setlabel(&label);
type = gettoken();
}
if (type == T_RIGHTPAREN)
break;
if (type != T_COMMA) {
scanerror(T_COMMA, "Bad function definition");
return;
}
}
switch (gettoken()) {
case T_ASSIGN:
getsimplebody();
break;
case T_LEFTBRACE:
getbody(NULL_LABEL, NULL_LABEL, NULL_LABEL,
NULL_LABEL);
break;
default:
scanerror(T_NULL,
"Left brace or equals sign "
"expected for function");
return;
}
endfunc();
exitfuncscope();
}
/*
* Get a simple assignment style body for a function declaration.
* simplebody = '=' assignment '\n'.
*/
static void
getsimplebody(void)
{
(void) tokenmode(TM_NEWLINES);
(void) getexprlist();
addop(OP_RETURN);
}
/*
* Get the body of a function, or a subbody of a function.
* body = '{' [ declarations ] ... [ statement ] ... '}'
* | [ declarations ] ... [statement ] ... '\n'
*/
/*ARGSUSED*/
static void
getbody(LABEL *contlabel, LABEL *breaklabel, LABEL *nextcaselabel, LABEL *defaultlabel)
{
int oldmode;
oldmode = tokenmode(TM_DEFAULT);
while (TRUE) {
switch (gettoken()) {
case T_RIGHTBRACE:
(void) tokenmode(oldmode);
return;
case T_EOF:
scanerror(T_NULL, "End-of-file in function body");
return;
default:
rescantoken();
getstatement(contlabel, breaklabel,
nextcaselabel, defaultlabel);
}
}
}
/*
* Get a line of possible local, global, or static variable declarations.
* declarations = { LOCAL | GLOBAL | STATIC } onedeclaration
* [ ',' onedeclaration ] ... ';'.
*/
static int
getdeclarations(int symtype)
{
int res = 0;
while (TRUE) {
switch (gettoken()) {
case T_COMMA:
continue;
case T_NEWLINE:
case T_SEMICOLON:
case T_RIGHTBRACE:
case T_EOF:
rescantoken();
return res;
case T_SYMBOL:
addopone(OP_DEBUG, linenumber());
rescantoken();
if (getsimpledeclaration(symtype))
res = 1;
break;
case T_MAT:
addopone(OP_DEBUG, linenumber());
getmatdeclaration(symtype);
res = 1;
break;
case T_OBJ:
addopone(OP_DEBUG, linenumber());
getobjdeclaration(symtype);
addop(OP_POP);
res = 1;
break;
default:
scanerror(T_SEMICOLON,
"Bad syntax in declaration statement");
return res;
}
}
}
/*
* Get declaration of a sequence of simple identifiers, as in
* global a, b = 1, c d = 2, d;
* Subsequences end with "," or at end of line; spaces indicate
* repeated assignment, e.g. "c d = 2" has the effect of "c = 2, d = 2".
*/
static int
getsimpledeclaration(int symtype)
{
int res = 0;
for (;;) {
switch (gettoken()) {
case T_SYMBOL:
rescantoken();
if (getonevariable(symtype)) {
res = 1;
addop(OP_POP);
}
continue;
case T_COMMA:
continue;
default:
rescantoken();
return res;
}
}
}
/*
* Get one variable in a sequence of simple identifiers.
* Returns 1 if the subsequence in which the variable occurs ends with
* an assignment, e.g. for the variables b, c, d, in
* static a, b = 1, c d = 2, d;
*/
static int
getonevariable(int symtype)
{
char *name;
int res = 0;
switch(gettoken()) {
case T_SYMBOL:
name = addliteral(tokensymbol());
res = getonevariable(symtype);
definesymbol(name, symtype);
if (res) {
usesymbol(name, 0);
addop(OP_ASSIGNBACK);
}
return res;
case T_ASSIGN:
getopassignment();
rescantoken();
return 1;
default:
rescantoken();
return 0;
}
}
/*
* Get a statement.
* statement = IF condition statement [ELSE statement]
* | FOR '(' [assignment] ';' [assignment] ';' [assignment] ')' statement
* | WHILE condition statement
* | DO statement WHILE condition ';'
* | SWITCH condition '{' [caseclause] ... '}'
* | CONTINUE ';'
* | BREAK ';'
* | RETURN assignment ';'
* | GOTO label ';'
* | PRINT assignment [, assignment ] ... ';'
* | QUIT [ string ] ';'
* | ABORT [ string ] ';'
* | SHOW item ';'
* | body
* | assignment ';'
* | label ':' statement
* | ';'.
*
* given:
* contlabel label for continue statement
* breaklabel label for break statement
* nextcaselabel label for next case statement
* defaultlabel label for default case
*/
static void
getstatement(LABEL *contlabel, LABEL *breaklabel, LABEL *nextcaselabel, LABEL *defaultlabel)
{
LABEL label;
LABEL label1, label2, label3, label4; /* locations for jumps */
int type;
BOOL printeol;
int oldmode;
addopone(OP_DEBUG, linenumber());
switch (gettoken()) {
case T_NEWLINE:
case T_SEMICOLON:
return;
case T_GLOBAL:
(void) getdeclarations(SYM_GLOBAL);
break;
case T_STATIC:
clearlabel(&label);
addoplabel(OP_INITSTATIC, &label);
if (getdeclarations(SYM_STATIC))
setlabel(&label);
else
curfunc->f_opcodecount -= 2;
break;
case T_LOCAL:
(void) getdeclarations(SYM_LOCAL);
break;
case T_RIGHTBRACE:
scanerror(T_NULL, "Extraneous right brace");
return;
case T_CONTINUE:
if (contlabel == NULL_LABEL) {
scanerror(T_SEMICOLON,
"CONTINUE not within FOR, WHILE, or DO");
return;
}
addoplabel(OP_JUMP, contlabel);
break;
case T_BREAK:
if (breaklabel == NULL_LABEL) {
scanerror(T_SEMICOLON,
"BREAK not within FOR, WHILE, or DO");
return;
}
addoplabel(OP_JUMP, breaklabel);
break;
case T_GOTO:
if (gettoken() != T_SYMBOL) {
scanerror(T_SEMICOLON, "Missing label in goto");
return;
}
addop(OP_JUMP);
addlabel(tokensymbol());
break;
case T_RETURN:
switch (gettoken()) {
case T_NEWLINE:
case T_SEMICOLON:
addop(OP_UNDEF);
addop(OP_RETURN);
return;
default:
rescantoken();
(void) getexprlist();
if (curfunc->f_name[0] == '*')
addop(OP_SAVE);
addop(OP_RETURN);
}
break;
case T_LEFTBRACE:
getbody(contlabel, breaklabel, nextcaselabel, defaultlabel);
return;
case T_IF:
clearlabel(&label1);
clearlabel(&label2);
getcondition();
switch(gettoken()) {
case T_CONTINUE:
if (contlabel == NULL_LABEL) {
scanerror(T_SEMICOLON,
"CONTINUE not within FOR, "
"WHILE, or DO");
return;
}
addoplabel(OP_JUMPNZ, contlabel);
break;
case T_BREAK:
if (breaklabel == NULL_LABEL) {
scanerror(T_SEMICOLON,
"BREAK not within FOR, "
"WHILE, or DO");
return;
}
addoplabel(OP_JUMPNZ, breaklabel);
break;
case T_GOTO:
if (gettoken() != T_SYMBOL) {
scanerror(T_SEMICOLON,
"Missing label in goto");
return;
}
addop(OP_JUMPNZ);
addlabel(tokensymbol());
break;
default:
addoplabel(OP_JUMPZ, &label1);
rescantoken();
getstatement(contlabel, breaklabel,
NULL_LABEL, NULL_LABEL);
if (gettoken() != T_ELSE) {
setlabel(&label1);
rescantoken();
return;
}
addoplabel(OP_JUMP, &label2);
setlabel(&label1);
getstatement(contlabel, breaklabel,
NULL_LABEL, NULL_LABEL);
setlabel(&label2);
return;
}
if (gettoken() != T_SEMICOLON) /* This makes ';' optional */
rescantoken();
if (gettoken() != T_ELSE) {
rescantoken();
return;
}
getstatement(contlabel, breaklabel, NULL_LABEL, NULL_LABEL);
return;
case T_FOR: /* for (a; b; c) x */
oldmode = tokenmode(TM_DEFAULT);
clearlabel(&label1);
clearlabel(&label2);
clearlabel(&label3);
clearlabel(&label4);
contlabel = NULL_LABEL;
breaklabel = &label4;
if (gettoken() != T_LEFTPAREN) {
(void) tokenmode(oldmode);
scanerror(T_SEMICOLON, "Left parenthesis expected");
return;
}
if (gettoken() != T_SEMICOLON) { /* have 'a' part */
rescantoken();
(void) getexprlist();
addop(OP_POP);
if (gettoken() != T_SEMICOLON) {
(void) tokenmode(oldmode);
scanerror(T_SEMICOLON, "Missing semicolon");
return;
}
}
if (gettoken() != T_SEMICOLON) { /* have 'b' part */
setlabel(&label1);
contlabel = &label1;
rescantoken();
(void) getexprlist();
addoplabel(OP_JUMPNZ, &label3);
addoplabel(OP_JUMP, breaklabel);
if (gettoken() != T_SEMICOLON) {
(void) tokenmode(oldmode);
scanerror(T_SEMICOLON, "Missing semicolon");
return;
}
}
if (gettoken() != T_RIGHTPAREN) { /* have 'c' part */
if (label1.l_offset < 0)
addoplabel(OP_JUMP, &label3);
setlabel(&label2);
contlabel = &label2;
rescantoken();
(void) getexprlist();
addop(OP_POP);
if (label1.l_offset >= 0)
addoplabel(OP_JUMP, &label1);
if (gettoken() != T_RIGHTPAREN) {
(void) tokenmode(oldmode);
scanerror(T_SEMICOLON,
"Right parenthesis expected");
return;
}
}
setlabel(&label3);
if (contlabel == NULL_LABEL)
contlabel = &label3;
getstatement(contlabel, breaklabel, NULL_LABEL, NULL_LABEL);
addoplabel(OP_JUMP, contlabel);
setlabel(breaklabel);
(void) tokenmode(oldmode);
return;
case T_WHILE:
oldmode = tokenmode(TM_DEFAULT);
contlabel = &label1;
clearlabel(contlabel);
setlabel(contlabel);
getcondition();
if (gettoken() != T_SEMICOLON) {
breaklabel = &label2;
clearlabel(breaklabel);
addoplabel(OP_JUMPZ, breaklabel);
rescantoken();
getstatement(contlabel, breaklabel,
NULL_LABEL, NULL_LABEL);
addoplabel(OP_JUMP, contlabel);
setlabel(breaklabel);
} else {
addoplabel(OP_JUMPNZ, contlabel);
}
(void) tokenmode(oldmode);
return;
case T_DO:
oldmode = tokenmode(TM_DEFAULT);
contlabel = &label1;
breaklabel = &label2;
clearlabel(contlabel);
clearlabel(breaklabel);
clearlabel(&label3);
setlabel(&label3);
getstatement(contlabel, breaklabel, NULL_LABEL, NULL_LABEL);
if (gettoken() != T_WHILE) {
(void) tokenmode(oldmode);
scanerror(T_SEMICOLON,
"WHILE keyword expected for DO statement");
return;
}
setlabel(contlabel);
getcondition();
addoplabel(OP_JUMPNZ, &label3);
setlabel(breaklabel);
(void) tokenmode(oldmode);
return;
case T_SWITCH:
oldmode = tokenmode(TM_DEFAULT);
breaklabel = &label1;
nextcaselabel = &label2;
defaultlabel = &label3;
clearlabel(breaklabel);
clearlabel(nextcaselabel);
clearlabel(defaultlabel);
getcondition();
if (gettoken() != T_LEFTBRACE) {
(void) tokenmode(oldmode);
scanerror(T_SEMICOLON,
"Missing left brace for switch statement");
return;
}
addoplabel(OP_JUMP, nextcaselabel);
rescantoken();
getstatement(contlabel, breaklabel,
nextcaselabel, defaultlabel);
addoplabel(OP_JUMP, breaklabel);
setlabel(nextcaselabel);
if (defaultlabel->l_offset > 0)
addoplabel(OP_JUMP, defaultlabel);
else
addop(OP_POP);
setlabel(breaklabel);
(void) tokenmode(oldmode);
return;
case T_CASE:
if (nextcaselabel == NULL_LABEL) {
scanerror(T_SEMICOLON,
"CASE not within SWITCH statement");
return;
}
clearlabel(&label1);
addoplabel(OP_JUMP, &label1);
setlabel(nextcaselabel);
clearlabel(nextcaselabel);
(void) getexprlist();
if (gettoken() != T_COLON) {
scanerror(T_SEMICOLON,
"Colon expected after CASE expression");
return;
}
addoplabel(OP_CASEJUMP, nextcaselabel);
setlabel(&label1);
getstatement(contlabel, breaklabel,
nextcaselabel, defaultlabel);
return;
case T_DEFAULT:
if (gettoken() != T_COLON) {
scanerror(T_SEMICOLON,
"Colon expected after DEFAULT keyword");
return;
}
if (defaultlabel == NULL_LABEL) {
scanerror(T_SEMICOLON,
"DEFAULT not within SWITCH statement");
return;
}
if (defaultlabel->l_offset > 0) {
scanerror(T_SEMICOLON,
"Multiple DEFAULT clauses in SWITCH");
return;
}
clearlabel(&label1);
addoplabel(OP_JUMP, &label1);
setlabel(defaultlabel);
addop(OP_POP);
setlabel(&label1);
getstatement(contlabel, breaklabel,
nextcaselabel, defaultlabel);
return;
case T_ELSE:
scanerror(T_SEMICOLON, "ELSE without preceding IF");
return;
case T_SHOW:
getshowstatement();
break;
case T_PRINT:
printeol = TRUE;
for (;;) {
switch (gettoken()) {
case T_RIGHTPAREN:
case T_RIGHTBRACKET:
case T_RIGHTBRACE:
case T_NEWLINE:
case T_EOF:
rescantoken();
/*FALLTHRU*/
case T_SEMICOLON:
if (printeol)
addop(OP_PRINTEOL);
return;
case T_COMMA:
addop(OP_PRINTSPACE);
/*FALLTHRU*/
case T_COLON:
printeol = FALSE;
break;
case T_STRING:
printeol = TRUE;
addopone(OP_PRINTSTRING, tokenstring());
break;
default:
printeol = TRUE;
rescantoken();
(void) getopassignment();
addopone(OP_PRINT, (long) PRINT_NORMAL);
}
}
case T_QUIT:
switch (gettoken()) {
case T_STRING:
addopone(OP_QUIT, tokenstring());
break;
default:
addopone(OP_QUIT, -1);
rescantoken();
}
break;
case T_ABORT:
switch (gettoken()) {
case T_STRING:
addopone(OP_ABORT, tokenstring());
break;
default:
addopone(OP_ABORT, -1);
rescantoken();
}
break;
case T_SYMBOL:
if (nextchar() == ':') { /****HACK HACK****/
definelabel(tokensymbol());
if (gettoken() == T_RIGHTBRACE) {
rescantoken();
return;
}
rescantoken();
getstatement(contlabel, breaklabel,
NULL_LABEL, NULL_LABEL);
return;
}
reread();