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/*##############################################################################
FUNNNELWEB COPYRIGHT
====================
FunnelWeb is a literate-programming macro preprocessor.
The FunnelWeb web is at http://www.ross.net/funnelweb/
Copyright (c) Ross N. Williams 1992. All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of Version 2 of the GNU General Public License as
published by the Free Software Foundation (http://www.gnu.org/).
This program is distributed WITHOUT ANY WARRANTY; without even the implied
warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See Version 2 of the GNU General Public License for more details.
You should have received a copy of Version 2 of the GNU General Public
License along with this program. If not, you can obtain a copy as follows:
ftp://prep.ai.mit.edu/pub/gnu/COPYING-2.0
or write to:
Free Software Foundation, Inc.,
59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
Section 2a of the license requires that all changes to this file be
recorded prominently in this file. Please record all changes here.
Programmers:
RNW Ross N. Williams (ross@ross.net)
Changes:
07-May-1992 RNW Program prepared for release under GNU GPL V2.
09-May-1999 RNW Modified to cater for multiple library levels.
##############################################################################*/
/******************************************************************************/
/* ANALYSE.C */
/******************************************************************************/
#include "style.h"
#include "analyse.h"
#include "as.h"
#include "data.h"
#include "lister.h"
#include "misc.h"
#include "table.h"
/******************************************************************************/
LOCAL void chk_mac P_((p_ma_t));
LOCAL void chk_mac (p_ma)
p_ma_t p_ma;
{
mc_t *call;
p_md_t p_md;
/* Deal with undefined macros by flagging the first invocation. */
if (!maisdef(p_ma))
{
ls_loo(p_ma->ma_calls,(ulong) 1,PPV &call);
as_cold(call!=NULL,"check_macro: No instances of \"undefined\" macro!");
lr_err(&call->mc_ps,"Call to undefined macro.");
return;
}
p_md = &p_ma->ma_defn[p_ma->ma_minlev];
/* Assert: The macro has a definition. */
/* Check that all the calls to the macro have the correct number of params. */
ls_fir(p_ma->ma_calls);
ls_nxt(p_ma->ma_calls,PPV &call);
while (call!=NULL)
{
if (call->mc_npar != p_md->md_npar)
{
sprintf(linet1,"Call has %lu parameter%s, but the macro",
(ulong) call->mc_npar,
call->mc_npar==1 ? "" : "s");
lr_err(&(call->mc_ps),linet1);
sprintf(linet1,"definition at line %lu specifies %lu parameter%s.",
(ulong) p_md->md_ps.ps_line,
(ulong) p_md->md_npar,
p_md->md_npar==1 ? "" : "s");
lr_mes(&(call->mc_ps),linet1);
if (p_md->md_npar==0 && call->mc_npar==1)
{
lr_mes(&(call->mc_ps),"Note: If your call looks like this: @<Macro@>@(@) then you");
lr_mes(&(call->mc_ps),"should be aware that FunnelWeb treats this as a call with");
lr_mes(&(call->mc_ps),"a single parameter consisting of the empty string. This");
lr_mes(&(call->mc_ps),"is a consequence of parameter delimiters @\"@\" being optional.");
}
}
ls_nxt(p_ma->ma_calls,PPV &call);
}
/* Check that the number of calls of the macro is legal. */
if (p_md->md_isfil)
{
/* Flag all calls to a file macro as errors. */
if (ls_len(p_ma->ma_calls)>0)
{
lr_mes(&p_md->md_ps,
"This file macro is called one or more times.");
lr_mes(&p_md->md_ps,
"Each call has been flagged with an error message.");
}
ls_fir(p_ma->ma_calls);
ls_nxt(p_ma->ma_calls,PPV &call);
while (call!=NULL)
{
lr_err(&(call->mc_ps),"Calls to file macros are not allowed.");
lr_mes(&(call->mc_ps),"Reason: It should be possible to comment out a");
lr_mes(&(call->mc_ps),"file macro without a big fuss. Calling a file macro");
lr_mes(&(call->mc_ps),"just tangles it up in the macro structure,");
lr_mes(&(call->mc_ps),"making it more difficult to comment out later.");
ls_nxt(p_ma->ma_calls,PPV &call);
}
}
else
{
/* Non-file macros. */
if (ls_len(p_ma->ma_calls)==0 && !p_md->md_iszer)
lr_err(&p_md->md_ps,
"This macro is never used (and has no @Z).");
if (ls_len(p_ma->ma_calls)>1 && !p_md->md_isman)
lr_err(&p_md->md_ps,
"This macro is used more than once (and has no @M).");
}
}
/******************************************************************************/
LOCAL void chk_rec P_((void));
LOCAL void chk_rec()
/* This macro analyses the calls between the macros in the macro */
/* table and flags all recursive macros with an error message. */
/* */
/* Def: A macro is a "level 0 macro" if it does not call any macros. */
/* Def: A macro is a "level n macro" if it calls at least one macro of level */
/* n-1, but does not call any macros of level n or higher. */
/* Def: A macro is a "level infinity macro" if it directly or indirectly */
/* calls itself. */
/* */
/* This function totally ignores undefined macros. This means that it can be */
/* invoked even if problems are detected by the other checks. */
/* */
/* Although the actions here may seem rather time expensive, they may not */
/* be. The function repeatedly runs through the macro table and each macro's */
/* bodypart list and expression lists. However, there are not likely to be */
/* many macros and each definition expression list is likely to be quite */
/* short, as each macro will be mainly text. */
/* Even if this stuff does take a while, it is better to detect recursion now */
/* than at tangle time! */
{
p_ma_t p_ma; /* General purpose pointer to macro. */
name_t dummy_name; /* Dummy name variable acts as a placeholder in calls. */
uword level; /* Level of macro currently being tagged. */
bool gotone; /* TRUE iff current loop iteration tagged >0 macros. */
/* We need a concrete number to stand for level infinity. */
/* 30000 is a nice, large 15 bit number. */
#define LEVINF 30000
/* Make sure that our idea of infinity is big enough. */
as_cold(tb_len(macro_table)<LEVINF,"ana_rec: too many macros.");
/* Tag all the macros as being at level infinity. */
/* This could be done in the parser, but it's neater to do it here. */
tb_fir(macro_table);
while (tb_rea(macro_table,PV dummy_name,PV &p_ma))
if (maisdef(p_ma))
p_ma->ma_level=LEVINF;
gotone=TRUE;
/* Work from level 0 upwards identifying macros of successive levels. */
for (level=0; level<LEVINF && gotone; level++)
{
/* Identify all macros of level 'level'. */
/* Gotone tells us if we managed to tag a macro during this iteration. */
gotone=FALSE;
/* Run through table tagging all macros at level 'level'. */
tb_fir(macro_table);
while (tb_rea(macro_table,PV dummy_name,PV &p_ma))
{
if ((maisdef(p_ma)) && (p_ma->ma_level == LEVINF))
{
p_md_t p_md = &p_ma->ma_defn[p_ma->ma_minlev];
p_bpls_t p_bpls = p_md->md_body;
/* Run through each body part of the macro. */
ls_fir(p_bpls);
while (TRUE)
{
p_bp_t p_bp;
ls_nxt(p_bpls,PPV &p_bp);
if (p_bp==NULL) break;
/* Run through the list of expression elements. */
ls_fir(p_bp->bp_ex);
while (TRUE)
{
p_el_t p_el;
ls_nxt(p_bp->bp_ex,PPV &p_el);
if (p_el==NULL) break;
/* Don't tag anything that calls anything that isn't tagged. */
if ((p_el->el_kind==EL_INVC ) &&
(maisdef(p_el->el_p_mac) ) &&
(p_el->el_p_mac->ma_level==LEVINF))
goto nextmacro;
}
}
/* If we got this far, then our macro must have called nothing but */
/* macros of levels [0,level-1]. Thus, we can tag it level 'level'. */
p_ma->ma_level=level;
gotone=TRUE;
} /* End if */
nextmacro:;
} /* End while */
} /* End for loop. */
/* At this point, we have tagged all macros with their level number. Note */
/* that level infinity macros are discovered simply because they do not get */
/* tagged. The following loop flags all such recursive macros with errors. */
tb_fir(macro_table);
while (tb_rea(macro_table,PV dummy_name,PV &p_ma))
if (maisdef(p_ma) && p_ma->ma_level==LEVINF)
{
p_md_t p_md = &p_ma->ma_defn[p_ma->ma_minlev];
lr_err(&p_md->md_ps,"This macro has an infinite expansion.");
}
/* Note: The above message is not "This macro is defined recursively", */
/* because this function catches not only recursive macros, but also all the */
/* non-recursive macros that call the recursive macros!! To detect only */
/* the recursive macros, we really ought to use Tarjan's algorithm for the */
/* detection of strongly connected components. However, I don't have the */
/* reference handy right now and I want to finish this version of FunnelWeb */
/* soon, so I'll leave the installation of Tarjan's algorithm as a possible */
/* future enhancement. Then the error message can be changed. */
}
/******************************************************************************/
EXPORT void analyse()
{
name_t dummy_name;
p_ma_t p_ma;
/* Issue an error if there are no macros. */
if (tb_len(macro_table)==0)
{
char *m="E: No macros defined.";
wl_l(m);
if (option.op_s_b)
wl_sj(m);
num_err++;
}
/* Issue an error if there are no product (output) files. */
if (tb_len(file_table)==0)
{
char *m="E: No output files specified.";
wl_l(m);
if (option.op_s_b)
wl_sj(m);
num_err++;
}
/* Take a look at each macro and issue appropriate diagnostics. */
tb_fir(macro_table);
while (tb_rea(macro_table,PV dummy_name,PV &p_ma))
chk_mac(p_ma);
/* Check for recursive macros. */
chk_rec();
/* Run through the document list and flag any sections that still have not */
/* been given names. */
ls_fir(document_list);
while (TRUE)
{
p_dc_t p_dc;
ls_nxt(document_list,PPV &p_dc);
if (p_dc==NULL) break;
if (p_dc->dc_kind==DC_TYPE &&
p_dc->dc_pty->ty_kind==TY_NSEC &&
!p_dc->dc_pty->ty_isnam)
{
lr_err(&p_dc->dc_ps,"This section has no name.");
lr_mes(&p_dc->dc_ps,"You can give it one explicitly (As in @A@<Sloth@>) or implicitly by");
lr_mes(&p_dc->dc_ps,"defining a macro (whose name will be inherited) within the section.");
}
}
}
/******************************************************************************/
/* End of ANALYSE.C */
/******************************************************************************/
|
