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BSD 4_3_Reno release
[unix-history] / usr / src / pgrm / error / errorpi.c
/*
* Copyright (c) 1980 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that: (1) source distributions retain this entire copyright
* notice and comment, and (2) distributions including binaries display
* the following acknowledgement: ``This product includes software
* developed by the University of California, Berkeley and its contributors''
* in the documentation or other materials provided with the distribution
* and in all advertising materials mentioning features or use of this
* software. Neither the name of the University nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#ifndef lint
static char sccsid[] = "@(#)errorpi.c 5.4 (Berkeley) 6/1/90";
#endif /* not lint */
#include <stdio.h>
#include <ctype.h>
#include "error.h"
extern char *currentfilename;
static char *c_linenumber;
static char *unk_hdr[] = {"In", "program", "???"};
static char **c_header = &unk_hdr[0];
/*
* Attempt to handle error messages produced by pi (and by pc)
*
* problem #1: There is no file name available when a file does not
* use a #include; this will have to be given to error
* in the command line.
* problem #2: pi doesn't always tell you what line number
* a error refers to; for example during the tree
* walk phase of code generation and error detection,
* an error can refer to "variable foo in procedure bletch"
* without giving a line number
* problem #3: line numbers, when available, are attached to
* the source line, along with the source line itself
* These line numbers must be extracted, and
* the source line thrown away.
* problem #4: Some error messages produce more than one line number
* on the same message.
* There are only two (I think):
* %s undefined on line%s
* %s improperly used on line%s
* here, the %s makes line plural or singular.
*
* Here are the error strings used in pi version 1.2 that can refer
* to a file name or line number:
*
* Multiply defined label in case, lines %d and %d
* Goto %s from line %d is into a structured statement
* End matched %s on line %d
* Inserted keyword end matching %s on line %d
*
* Here are the general pi patterns recognized:
* define piptr == -.*^-.*
* define msg = .*
* define digit = [0-9]
* definename = .*
* define date_format letter*3 letter*3 (digit | (digit digit))
* (digit | (digit digit)):digit*2 digit*4
*
* {e,E} (piptr) (msg) Encounter an error during textual scan
* E {digit}* - (msg) Have an error message that refers to a new line
* E - msg Have an error message that refers to current
* function, program or procedure
* (date_format) (name): When switch compilation files
* ... (msg) When refer to the previous line
* 'In' ('procedure'|'function'|'program') (name):
* pi is now complaining about 2nd pass errors.
*
* Here is the output from a compilation
*
*
* 2 var i:integer;
* e --------------^--- Inserted ';'
* E 2 - All variables must be declared in one var part
* E 5 - Include filename must end in .i
* Mon Apr 21 15:56 1980 test.h:
* 2 begin
* e ------^--- Inserted ';'
* Mon Apr 21 16:06 1980 test.p:
* E 2 - Function type must be specified
* 6 procedure foo(var x:real);
* e ------^--- Inserted ';'
* In function bletch:
* E - No assignment to the function variable
* w - variable x is never used
* E 6 - foo is already defined in this block
* In procedure foo:
* w - variable x is neither used nor set
* 9 z : = 23;
* E --------------^--- Undefined variable
* 10 y = [1];
* e ----------------^--- Inserted ':'
* 13 z := 345.;
* e -----------------------^--- Digits required after decimal point
* E 10 - Constant set involved in non set context
* E 11 - Type clash: real is incompatible with integer
* ... Type of expression clashed with type of variable in assignment
* E 12 - Parameter type not identical to type of var parameter x of foo
* In program mung:
* w - variable y is never used
* w - type foo is never used
* w - function bletch is never used
* E - z undefined on lines 9 13
*/
char *Months[] = {
"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct","Nov", "Dec",
0
};
char *Days[] = {
"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", 0
};
char *Piroutines[] = {
"program", "function", "procedure", 0
};
static boolean structured, multiple;
char *pi_Endmatched[] = {"End", "matched"};
char *pi_Inserted[] = {"Inserted", "keyword", "end", "matching"};
char *pi_multiple[] = {"Mutiply", "defined", "label", "in", "case,", "line"};
char *pi_structured[] = {"is", "into", "a", "structured", "statement"};
char *pi_und1[] = {"undefined", "on", "line"};
char *pi_und2[] = {"undefined", "on", "lines"};
char *pi_imp1[] = {"improperly", "used", "on", "line"};
char *pi_imp2[] = {"improperly", "used", "on", "lines"};
boolean alldigits(string)
reg char *string;
{
for (; *string && isdigit(*string); string++)
continue;
return(*string == '\0');
}
boolean instringset(member, set)
char *member;
reg char **set;
{
for(; *set; set++){
if (strcmp(*set, member) == 0)
return(TRUE);
}
return(FALSE);
}
boolean isdateformat(wordc, wordv)
int wordc;
char **wordv;
{
return(
(wordc == 5)
&& (instringset(wordv[0], Days))
&& (instringset(wordv[1], Months))
&& (alldigits(wordv[2]))
&& (alldigits(wordv[4])) );
}
boolean piptr(string)
reg char *string;
{
if (*string != '-')
return(FALSE);
while (*string && *string == '-')
string++;
if (*string != '^')
return(FALSE);
string++;
while (*string && *string == '-')
string++;
return(*string == '\0');
}
extern int wordc;
extern char **wordv;
Errorclass pi()
{
char **nwordv;
if (wordc < 2)
return (C_UNKNOWN);
if ( ( strlen(wordv[1]) == 1)
&& ( (wordv[1][0] == 'e') || (wordv[1][0] == 'E') )
&& ( piptr(wordv[2]) )
) {
boolean longpiptr = 0;
/*
* We have recognized a first pass error of the form:
* letter ------^---- message
*
* turn into an error message of the form:
*
* file line 'pascal errortype' letter \n |---- message
* or of the form:
* file line letter |---- message
* when there are strlen("(*[pi]") or more
* preceding '-' on the error pointer.
*
* Where the | is intended to be a down arrow, so that
* the pi error messages can be inserted above the
* line in error, instead of below. (All of the other
* langauges put thier messages before the source line,
* instead of after it as does pi.)
*
* where the pointer to the error has been truncated
* by 6 characters to account for the fact that
* the pointer points into a tab preceded input line.
*/
language = INPI;
(void)substitute(wordv[2], '^', '|');
longpiptr = position(wordv[2],'|') > (6+8);
nwordv = wordvsplice(longpiptr ? 2 : 4, wordc, wordv+1);
nwordv[0] = strsave(currentfilename);
nwordv[1] = strsave(c_linenumber);
if (!longpiptr){
nwordv[2] = "pascal errortype";
nwordv[3] = wordv[1];
nwordv[4] = strsave("%%%\n");
if (strlen(nwordv[5]) > (8-2)) /* this is the pointer */
nwordv[5] += (8-2); /* bump over 6 characters */
}
wordv = nwordv - 1; /* convert to 1 based */
wordc += longpiptr ? 2 : 4;
return(C_TRUE);
}
if ( (wordc >= 4)
&& (strlen(wordv[1]) == 1)
&& ( (*wordv[1] == 'E') || (*wordv[1] == 'w') || (*wordv[1] == 'e') )
&& (alldigits(wordv[2]))
&& (strlen(wordv[3]) == 1)
&& (wordv[3][0] == '-')
){
/*
* Message of the form: letter linenumber - message
* Turn into form: filename linenumber letter - message
*/
language = INPI;
nwordv = wordvsplice(1, wordc, wordv + 1);
nwordv[0] = strsave(currentfilename);
nwordv[1] = wordv[2];
nwordv[2] = wordv[1];
c_linenumber = wordv[2];
wordc += 1;
wordv = nwordv - 1;
return(C_TRUE);
}
if ( (wordc >= 3)
&& (strlen(wordv[1]) == 1)
&& ( (*(wordv[1]) == 'E') || (*(wordv[1]) == 'w') || (*(wordv[1]) == 'e') )
&& (strlen(wordv[2]) == 1)
&& (wordv[2][0] == '-')
) {
/*
* Message of the form: letter - message
* This happens only when we are traversing the tree
* during the second pass of pi, and discover semantic
* errors.
*
* We have already (presumably) saved the header message
* and can now construct a nulled error message for the
* current file.
*
* Turns into a message of the form:
* filename (header) letter - message
*
* First, see if it is a message referring to more than
* one line number. Only of the form:
* %s undefined on line%s
* %s improperly used on line%s
*/
boolean undefined = 0;
int wordindex;
language = INPI;
if ( (undefined = (wordvcmp(wordv+2, 3, pi_und1) == 0) )
|| (undefined = (wordvcmp(wordv+2, 3, pi_und2) == 0) )
|| (wordvcmp(wordv+2, 4, pi_imp1) == 0)
|| (wordvcmp(wordv+2, 4, pi_imp2) == 0)
){
for (wordindex = undefined ? 5 : 6; wordindex <= wordc;
wordindex++){
nwordv = wordvsplice(2, undefined ? 2 : 3, wordv+1);
nwordv[0] = strsave(currentfilename);
nwordv[1] = wordv[wordindex];
if (wordindex != wordc)
erroradd(undefined ? 4 : 5, nwordv,
C_TRUE, C_UNKNOWN);
}
wordc = undefined ? 4 : 5;
wordv = nwordv - 1;
return(C_TRUE);
}
nwordv = wordvsplice(1+3, wordc, wordv+1);
nwordv[0] = strsave(currentfilename);
nwordv[1] = strsave(c_header[0]);
nwordv[2] = strsave(c_header[1]);
nwordv[3] = strsave(c_header[2]);
wordv = nwordv - 1;
wordc += 1 + 3;
return(C_THISFILE);
}
if (strcmp(wordv[1], "...") == 0){
/*
* have a continuation error message
* of the form: ... message
* Turn into form : filename linenumber message
*/
language = INPI;
nwordv = wordvsplice(1, wordc, wordv+1);
nwordv[0] = strsave(currentfilename);
nwordv[1] = strsave(c_linenumber);
wordv = nwordv - 1;
wordc += 1;
return(C_TRUE);
}
if( (wordc == 6)
&& (lastchar(wordv[6]) == ':')
&& (isdateformat(5, wordv + 1))
){
/*
* Have message that tells us we have changed files
*/
language = INPI;
currentfilename = strsave(wordv[6]);
clob_last(currentfilename, '\0');
return(C_SYNC);
}
if( (wordc == 3)
&& (strcmp(wordv[1], "In") == 0)
&& (lastchar(wordv[3]) == ':')
&& (instringset(wordv[2], Piroutines))
) {
language = INPI;
c_header = wordvsplice(0, wordc, wordv+1);
return(C_SYNC);
}
/*
* now, check for just the line number followed by the text
*/
if (alldigits(wordv[1])){
language = INPI;
c_linenumber = wordv[1];
return(C_IGNORE);
}
/*
* Attempt to match messages refering to a line number
*
* Multiply defined label in case, lines %d and %d
* Goto %s from line %d is into a structured statement
* End matched %s on line %d
* Inserted keyword end matching %s on line %d
*/
multiple = structured = 0;
if (
( (wordc == 6) && (wordvcmp(wordv+1, 2, pi_Endmatched) == 0))
|| ( (wordc == 8) && (wordvcmp(wordv+1, 4, pi_Inserted) == 0))
|| ( multiple = ((wordc == 9) && (wordvcmp(wordv+1,6, pi_multiple) == 0) ) )
|| ( structured = ((wordc == 10) && (wordvcmp(wordv+6,5, pi_structured) == 0 ) ))
){
language = INPI;
nwordv = wordvsplice(2, wordc, wordv+1);
nwordv[0] = strsave(currentfilename);
nwordv[1] = structured ? wordv [5] : wordv[wordc];
wordc += 2;
wordv = nwordv - 1;
if (!multiple)
return(C_TRUE);
erroradd(wordc, nwordv, C_TRUE, C_UNKNOWN);
nwordv = wordvsplice(0, wordc, nwordv);
nwordv[1] = wordv[wordc - 2];
return(C_TRUE);
}
return(C_UNKNOWN);
}
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.