4.4BSD/usr/src/usr.bin/pascal/src/stab.c
/*-
* Copyright (c) 1980, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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 BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static char sccsid[] = "@(#)stab.c 8.1 (Berkeley) 6/6/93";
#endif /* not lint */
/*
* Procedures to put out symbol table information
* and stabs for separate compilation type checking.
* These use the .stabs, .stabn, and .stabd directives.
*/
#include "whoami.h"
#ifdef PC
/* and the rest of the file */
# include "0.h"
# include "objfmt.h"
# include "yy.h"
# include <stab.h>
/*
* additional symbol definition for <stab.h>
* that is used by the separate compilation facility --
* eventually, <stab.h> should be updated to include this
*/
# include "pstab.h"
# include "pc.h"
#define private static
int oldway = 0;
/*
* absolute value: line numbers are negative if error recovery.
*/
#define ABS( x ) ( x < 0 ? -x : x )
long checksum();
/*
* Generate information about variables.
*/
stabgvar (p, length, line)
struct nl *p;
int length, line;
{
putprintf(" .stabs \"%s\",0x%x,0,0x%x,0x%x",
0, p->symbol, N_PC, N_PGVAR, ABS(line)
);
if (oldway != 0) {
oldstabgvar(p->symbol, p2type(p->type), 0, length, line);
} else if (opt('g')) {
putprintf("\t.stabs\t\"%s:G", 1, p->symbol);
gentype(p->type);
putprintf("\",0x%x,0,0x%x,0", 0, N_GSYM, length);
}
}
stablvar (p, offset, length)
struct nl *p;
int offset, length;
{
int level;
level = (p->nl_block & 037);
if (oldway != 0) {
oldstablvar(p->symbol, p2type(p->type), level, offset, length);
} else if (opt('g')) {
putprintf("\t.stabs\t\"%s:", 1, p->symbol);
gentype(p->type);
putprintf("\",0x%x,0,0x%x,0x%x", 0, N_LSYM, length, offset);
}
}
/*
* global variables
*/
/*ARGSUSED*/
oldstabgvar( name , type , offset , length , line )
char *name;
int type;
int offset;
int length;
int line;
{
if ( ! opt('g') ) {
return;
}
putprintf( " .stabs \"" , 1 );
putprintf( NAMEFORMAT , 1 , (int) name );
putprintf( "\",0x%x,0,0x%x,0" , 0 , N_GSYM , type );
putprintf( " .stabs \"" , 1 );
putprintf( NAMEFORMAT , 1 , (int) name );
putprintf( "\",0x%x,0,0,0x%x" , 0 , N_LENG , length );
}
/*
* local variables
*/
/*ARGSUSED*/
oldstablvar( name , type , level , offset , length )
char *name;
int type;
int level;
int offset;
int length;
{
if ( ! opt('g') ) {
return;
}
putprintf( " .stabs \"" , 1 );
putprintf( NAMEFORMAT , 1 , (int) name );
putprintf( "\",0x%x,0,0x%x,0x%x" , 0 , N_LSYM , type , -offset );
putprintf( " .stabs \"" , 1 );
putprintf( NAMEFORMAT , 1 , (int) name );
putprintf( "\",0x%x,0,0,0x%x" , 0 , N_LENG , length );
}
stabparam (p, offset, length)
struct nl *p;
int offset, length;
{
if (oldway != 0) {
oldstabparam(p->symbol, p2type(p->type), offset, length);
} else if (opt('g')) {
putprintf("\t.stabs\t\"%s:", 1, p->symbol);
if (p->class == REF) {
putprintf("v", 1);
} else {
putprintf("p", 1);
}
gentype((p->class == FPROC || p->class ==FFUNC) ? p : p->type);
putprintf("\",0x%x,0,0x%x,0x%x", 0, N_PSYM, length, offset);
}
}
/*
* parameters
*/
oldstabparam( name , type , offset , length )
char *name;
int type;
int offset;
int length;
{
if ( ! opt('g') ) {
return;
}
putprintf( " .stabs \"" , 1 );
putprintf( NAMEFORMAT , 1 , (int) name );
putprintf( "\",0x%x,0,0x%x,0x%x" , 0 , N_PSYM , type , offset );
putprintf( " .stabs \"" , 1 );
putprintf( NAMEFORMAT , 1 , (int) name );
putprintf( "\",0x%x,0,0,0x%x" , 0 , N_LENG , length );
}
/*
* fields
*/
/*
* left brackets
* (dbx handles module-2 without these, so we won't use them either)
*/
stablbrac( level )
int level;
{
if ( ! opt('g') || oldway == 0 ) {
return;
}
putprintf( " .stabd 0x%x,0,0x%x" , 0 , N_LBRAC , level );
}
/*
* right brackets
*/
stabrbrac( level )
int level;
{
if ( ! opt('g') || oldway == 0 ) {
return;
}
putprintf( " .stabd 0x%x,0,0x%x" , 0 , N_RBRAC , level );
}
stabfunc (p, name, line, level)
struct nl *p;
char *name;
int line, level;
{
char extname[BUFSIZ],nestspec[BUFSIZ];
if ( level == 1 ) {
if (p->class == FUNC) {
putprintf(" .stabs \"%s\",0x%x,0,0x%x,0x%x" ,
0 , name , N_PC , N_PGFUNC , ABS( line )
);
} else if (p->class == PROC) {
putprintf(" .stabs \"%s\",0x%x,0,0x%x,0x%x" ,
0 , name , N_PC , N_PGPROC , ABS( line )
);
}
}
if (oldway != 0) {
oldstabfunc(name, p->class, line, level);
} else if (opt('g')) {
putprintf("\t.stabs\t\"%s:", 1, name);
if (p->class == FUNC) {
putprintf("F", 1);
gentype(p->type);
putprintf(",", 1);
} else {
putprintf("P,", 1);
}
sextname(extname, name, level); /* set extname to entry label */
putprintf("%s,", 1, &(extname[1])); /* remove initial underbar */
snestspec(nestspec, level);
putprintf("%s\",0x%x,0,0,%s", 0, nestspec, N_FUN, extname);
}
}
/*
* construct the colon-separated static nesting string into a
* caller-supplied buffer
*/
private snestspec(buffer, level)
char buffer[];
int level;
{
char *starthere;
int i;
if (level <= 1) {
buffer[0] = '\0';
} else {
starthere = &buffer[0];
for ( i = 1 ; i < level ; i++ ) {
sprintf(starthere, "%s:", enclosing[i]);
starthere += strlen(enclosing[i]) + 1;
}
*--starthere = '\0'; /* remove last colon */
if (starthere >= &buffer[BUFSIZ-1]) {
panic("snestspec");
}
}
}
/*
* functions
*/
oldstabfunc( name , typeclass , line , level )
char *name;
int typeclass;
int line;
long level;
{
char extname[ BUFSIZ ];
/*
* for sdb
*/
if ( ! opt('g') ) {
return;
}
putprintf( " .stabs \"" , 1 );
putprintf( NAMEFORMAT , 1 , (int) name );
sextname( extname , name , (int) level );
putprintf( "\",0x%x,0,0x%x,%s" , 0 , N_FUN , line , (int) extname );
}
/*
* source line numbers
*/
stabline( line )
int line;
{
if ( ! opt('g') ) {
return;
}
putprintf( " .stabd 0x%x,0,0x%x" , 0 , N_SLINE , ABS( line ) );
}
/*
* source files get none or more of these:
* one as they are entered,
* and one every time they are returned to from nested #includes
*/
stabsource(filename, firsttime)
char *filename;
bool firsttime;
{
int label;
/*
* for separate compilation
*/
putprintf(" .stabs \"%s\",0x%x,0,0x%x,0x%x", 0,
(int) filename, N_PC, N_PSO, N_FLAGCHECKSUM);
/*
* for debugger
*/
if ( ! opt('g') ) {
return;
}
if (oldway != 0) {
label = (int) getlab();
putprintf( " .stabs \"" , 1 );
putprintf( NAMEFORMAT , 1 , filename );
putprintf( "\",0x%x,0,0," , 1 , N_SO );
putprintf( PREFIXFORMAT , 0 , LLABELPREFIX , label );
putprintf( PREFIXFORMAT , 1 , LLABELPREFIX , label );
putprintf( ":" , 0 );
} else {
if (firsttime) {
putprintf( " .stabs \"" , 1 );
putprintf( NAMEFORMAT , 1 , filename );
putprintf( "\",0x%x,0,0,0" , 0 , N_SO );
}
}
}
/*
* included files get one or more of these:
* one as they are entered by a #include,
* and one every time they are returned to from nested #includes.
*/
stabinclude(filename, firsttime)
char *filename;
bool firsttime;
{
int label;
long check;
/*
* for separate compilation
*/
if (firsttime) {
check = checksum(filename);
} else {
check = N_FLAGCHECKSUM;
}
putprintf(" .stabs \"%s\",0x%x,0,0x%x,0x%x", 0,
(int) filename, N_PC, N_PSOL, check);
/*
* for sdb
*/
if ( ! opt('g') ) {
return;
}
if (oldway != 0) {
label = (int) getlab();
putprintf( " .stabs \"" , 1 );
putprintf( NAMEFORMAT , 1 , filename );
putprintf( "\",0x%x,0,0," , 1 , N_SOL );
putprintf( PREFIXFORMAT , 0 , LLABELPREFIX , label );
putprintf( PREFIXFORMAT , 1 , LLABELPREFIX , label );
putprintf( ":" , 0 );
}
}
/*
* anyone know a good checksum for ascii files?
* this does a rotate-left and then exclusive-or's in the character.
* also, it avoids returning checksums of 0.
* The rotate is implemented by shifting and adding back the
* sign bit when negative.
*/
long
checksum(filename)
char *filename;
{
FILE *filep;
register int input;
register long check;
filep = fopen(filename, "r");
if (filep == NULL) {
perror(filename);
pexit(DIED);
}
check = 0;
while ((input = getc(filep)) != EOF) {
if (check < 0) {
check <<= 1;
check += 1;
} else {
check <<= 1;
}
check ^= input;
}
(void) fclose(filep);
if ((unsigned) check <= N_FLAGCHECKSUM) {
return N_FLAGCHECKSUM + 1;
} else {
return check;
}
}
/*
* global Pascal symbols :
* labels, types, constants, and external procedure and function names:
* These are used by the separate compilation facility
* to be able to check for disjoint header files.
*/
/*
* global labels
*/
stabglabel( label , line )
char *label;
int line;
{
putprintf( " .stabs \"%s\",0x%x,0,0x%x,0x%x" , 0
, (int) label , N_PC , N_PGLABEL , ABS( line ) );
}
/*
* global constants
*/
stabgconst( constant , line )
char *constant;
int line;
{
putprintf( " .stabs \"%s\",0x%x,0,0x%x,0x%x" , 0
, (int) constant , N_PC , N_PGCONST , ABS( line ) );
}
/*
* Generate symbolic information about a constant.
*/
stabconst (c)
struct nl *c;
{
if (opt('g') && oldway == 0) {
putprintf("\t.stabs\t\"%s:c=", 1, c->symbol);
if (c->type == nl + TSTR) {
putprintf("s'%s'", 1, c->ptr[0]);
} else if (c->type == nl + T1CHAR) {
putprintf("c%d", 1, c->range[0]);
} else if (isa(c->type, "i")) {
putprintf("i%d", 1, c->range[0]);
} else if (isa(c->type, "d")) {
putprintf("r%g", 1, c->real);
} else {
putprintf("e", 1);
gentype(c->type);
putprintf(",%d", 1, c->range[0]);
}
putprintf("\",0x%x,0,0x%x,0x%x", 0, N_LSYM, 0, 0);
}
}
stabgtype (name, type, line)
char *name;
struct nl *type;
int line;
{
putprintf(" .stabs \"%s\",0x%x,0,0x%x,0x%x" ,
0, name, N_PC , N_PGTYPE, ABS(line)
);
if (oldway == 0) {
stabltype(name, type);
}
}
stabltype (name, type)
char *name;
struct nl *type;
{
if (opt('g')) {
putprintf("\t.stabs\t\"%s:t", 1, name);
gentype(type);
putprintf("\",0x%x,0,0,0", 0, N_LSYM);
}
}
/*
* external functions and procedures
*/
stabefunc( name , typeclass , line )
char *name;
int typeclass;
int line;
{
int type;
if ( typeclass == FUNC ) {
type = N_PEFUNC;
} else if ( typeclass == PROC ) {
type = N_PEPROC;
} else {
return;
}
putprintf( " .stabs \"%s\",0x%x,0,0x%x,0x%x" , 0
, (int) name , N_PC , type , ABS( line ) );
}
/*
* Generate type information encoded as a string for dbx.
* The fwdptrnum field is used only when the type is a pointer
* to a type that isn't known when it was entered. When the
* type field is filled for some such tptr, fixfwdtype should
* be called to output an equivalencing type definition.
*/
typedef struct TypeDesc *TypeDesc;
struct TypeDesc {
struct nl *tptr;
int tnum;
int fwdptrnum;
TypeDesc chain;
};
#define TABLESIZE 2003
#define typehash(t) ( ( ((int) t) >> 2 ) % TABLESIZE )
private int tcount = 1;
private TypeDesc typetable[TABLESIZE];
private TypeDesc tdlookup (t)
struct nl *t;
{
register TypeDesc td;
td = typetable[typehash(t)];
while (td != NIL && td->tptr != t) {
td = td->chain;
}
return td;
}
private int typelookup (t)
struct nl *t;
{
register TypeDesc td;
int r;
td = tdlookup(t);
if (td == NIL) {
r = 0;
} else {
r = td->tnum;
}
return r;
}
private int entertype (type)
struct nl *type;
{
register TypeDesc td;
register int i;
td = (TypeDesc) malloc(sizeof(struct TypeDesc));
td->tptr = type;
td->tnum = tcount;
td->fwdptrnum = 0;
++tcount;
i = typehash(type);
td->chain = typetable[i];
typetable[i] = td;
return td->tnum;
}
/*
* The in_types table currently contains "boolean", "char", "integer",
* "real" and "_nil". (See nl.c for definition.)
* The lookup call below will give the TYPE class nl entry for these
* types. In each case except _nil, the type field of that entry is a RANGE
* class nl entry for the type. Sometimes other symbol table entries
* point to the TYPE entry (e.g., when there is a range over the base type),
* and other entries point to the RANGE entry (e.g., for a variable of the
* given type). We don't really want to distinguish between these uses
* in dbx, and since it appears that the RANGE entries are not reused if
* a range happens to coincide, we will give the two the same identifying
* dbx type number.
*/
private inittypes()
{
int i;
extern char *in_types[];
struct nl *p;
for (i = 0; in_types[i] != NIL; i++) {
p = lookup(in_types[i]);
if (p != NIL) {
entertype(p);
if (p->type != NIL) {
--tcount; /* see comment above */
entertype(p->type);
}
}
}
}
static genarray (t)
struct nl *t;
{
register struct nl *p;
for (p = t->chain; p != NIL; p = p->chain) {
putprintf("a", 1);
gentype(p);
putprintf(";", 1);
}
gentype(t->type);
}
/*
* Really we should walk through ptr[NL_FIELDLIST] for the fields,
* and then do the variant tag and fields separately, but dbx
* doesn't support this yet.
* So, since all the fields of all the variants are on the chain,
* we walk through that. Except that this gives the fields in the
* reverse order, so we want to print in reverse order.
*/
static genrecord (t)
struct nl *t;
{
putprintf("s%d", 1, t->value[NL_OFFS]);
if (t->chain != NIL) {
genrecfield(t->chain, 1);
}
putprintf(";", 1);
}
static genrecfield (t, n)
struct nl *t;
int n;
{
if (t->chain != NULL) {
genrecfield(t->chain, n + 1);
if (n % 2 == 0) {
gencontinue();
}
}
putprintf("%s:", 1, t->symbol);
gentype(t->type);
putprintf(",%d,%d;", 1, 8*t->value[NL_OFFS], 8*lwidth(t->type));
}
static genvarnt (t)
struct nl *t;
{
genrecord(t);
}
static genptr (t)
struct nl *t;
{
register TypeDesc td;
putprintf("*", 1);
if (t->type != NIL) {
gentype(t->type);
} else {
/*
* unresolved forward pointer: use tcount to represent what is
* begin pointed to, to be defined later
*/
td = tdlookup(t);
if (td == NIL) {
panic("nil ptr in stab.genptr");
}
td->fwdptrnum = tcount;
putprintf("%d", 1, tcount);
++tcount;
}
}
/*
* The type t is a pointer which has just had its type field filled.
* We need to generate a type stab saying that the number saved
* in t's fwdptrnum is the same as the t->type's number
*/
fixfwdtype (t)
struct nl *t;
{
register TypeDesc td;
if (opt('g') && oldway == 0) {
td = tdlookup(t);
if (td != NIL) {
putprintf("\t.stabs\t\":t%d=", 1, td->fwdptrnum);
gentype(t->type);
putprintf("\",0x%x,0,0,0", 0, N_LSYM);
}
}
}
static genenum (t)
struct nl *t;
{
register struct nl *e;
register int i;
putprintf("e", 1);
i = 1;
e = t->chain;
while (e != NULL) {
if (i > 2) {
gencontinue();
i = 0;
}
putprintf("%s:%d,", 1, e->symbol, e->range[0]);
e = e->chain;
++i;
}
putprintf(";", 1);
}
static genset (t)
struct nl *t;
{
putprintf("S", 1);
gentype(t->type);
}
static genrange (t)
struct nl *t;
{
putprintf("r", 1);
gentype(t->type);
putprintf(";%d;%d", 1, t->range[0], t->range[1]);
}
static genfparam (t)
struct nl *t;
{
struct nl *p;
int count;
if (t->type != NULL) {
putprintf("f", 1);
gentype(t->type);
putprintf(",", 1);
} else {
putprintf("p", 1);
}
count = 0;
for (p = t->ptr[NL_FCHAIN]; p != NULL; p = p->chain) {
++count;
}
putprintf("%d;", 1, count);
for (p = t->ptr[NL_FCHAIN]; p != NULL; p = p->chain) {
gentype(p->type);
putprintf(",%d;", 1, p->class);
}
}
static genfile (t)
struct nl *t;
{
putprintf("d", 1);
gentype(t->type);
}
static gentype (t)
struct nl *t;
{
int id;
if (tcount == 1) {
inittypes();
}
id = typelookup(t);
if (id != 0) {
putprintf("%d", 1, id);
} else if (t->class == SCAL && t->chain == NULL) {
id = typelookup(t->type);
if (id != 0) {
putprintf("%d", 1, id);
} else {
genenum(t->type);
}
} else {
id = entertype(t);
putprintf("%d=", 1, id);
switch (t->class) {
case TYPE:
gentype(t->type);
break;
case ARRAY:
genarray(t);
break;
case RECORD:
genrecord(t);
break;
case VARNT:
genvarnt(t);
break;
case REF:
gentype(t->type);
break;
case PTR:
genptr(t);
break;
case SET:
genset(t);
break;
case RANGE:
genrange(t);
break;
case SCAL:
genenum(t);
break;
case FPROC:
case FFUNC:
genfparam(t);
break;
case FILET:
case PTRFILE:
genfile(t);
break;
default:
/* This shouldn't happen */
/* Rather than bomb outright, let debugging go on */
warning();
error("Bad type class found in stab");
putprintf("1", 1, t->class);
break;
}
}
}
/*
* Continue stab information in a namelist new entry. This is necessary
* to avoid overflowing putprintf's buffer.
*/
static gencontinue ()
{
putprintf("?\",0x%x,0,0,0", 0, N_LSYM);
putprintf("\t.stabs\t\"", 1);
}
#endif PC