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This commit was manufactured by cvs2svn to create tag 'FreeBSD-release/1.0'.
[unix-history] / gnu / usr.bin / as / read.c
/*-
* This code is derived from software copyrighted by the Free Software
* Foundation.
*
* Modified 1991 by Donn Seeley at UUNET Technologies, Inc.
*/
#ifndef lint
static char sccsid[] = "@(#)read.c 6.4 (Berkeley) 5/8/91";
#endif /* not lint */
/* read.c - read a source file -
Copyright (C) 1986,1987 Free Software Foundation, Inc.
This file is part of GAS, the GNU Assembler.
GAS is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 1, or (at your option)
any later version.
GAS 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with GAS; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
#define MASK_CHAR (0xFF) /* If your chars aren't 8 bits, you will
change this a bit. But then, GNU isn't
spozed to run on your machine anyway.
(RMS is so shortsighted sometimes.)
*/
#define MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT (16)
/* This is the largest known floating point */
/* format (for now). It will grow when we */
/* do 4361 style flonums. */
/* Routines that read assembler source text to build spagetti in memory. */
/* Another group of these functions is in the as-expr.c module */
#include <ctype.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "as.h"
#include "read.h"
#include "md.h"
#include "hash.h"
#include "obstack.h"
#include "frags.h"
#include "flonum.h"
#include "struc-symbol.h"
#include "expr.h"
#include "symbols.h"
#ifdef SPARC
#include "sparc.h"
#define OTHER_ALIGN
#endif
#ifdef I860
#include "i860.h"
#endif
char * input_line_pointer; /* -> next char of source file to parse. */
#if BITS_PER_CHAR != 8
The following table is indexed by [ (char) ] and will break if
a char does not have exactly 256 states (hopefully 0:255!) !
#endif
const char /* used by is_... macros. our ctype[] */
lex_type [256] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* @ABCDEFGHIJKLMNO */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* PQRSTUVWXYZ[\]^_ */
0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, /* _!"#$%&'()*+,-./ */
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, /* 0123456789:;<=>? */
0, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* @ABCDEFGHIJKLMNO */
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 0, 0, 0, 3, /* PQRSTUVWXYZ[\]^_ */
0, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* `abcdefghijklmno */
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 0, 0, 0, 0, /* pqrstuvwxyz{|}~. */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};
/*
* In: a character.
* Out: TRUE if this character ends a line.
*/
#define _ (0)
const char is_end_of_line [256] = {
_, _, _, _, _, _, _, _, _, _,99, _, _, _, _, _, /* @abcdefghijklmno */
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
_, _, _, _, _, _, _, _, _, _, _,99, _, _, _, _, /* 0123456789:;<=>? */
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _ /* */
};
#undef _
/* Functions private to this file. */
void equals();
void big_cons();
void cons();
static char* demand_copy_C_string();
static char* demand_copy_string();
void demand_empty_rest_of_line();
void float_cons();
long int get_absolute_expression();
static char get_absolute_expression_and_terminator();
static segT get_known_segmented_expression();
void ignore_rest_of_line();
static int is_it_end_of_statement();
static void pobegin();
static void pseudo_set();
static void stab();
static void stringer();
extern char line_comment_chars[];
static char * buffer_limit; /* -> 1 + last char in buffer. */
static char * bignum_low; /* Lowest char of bignum. */
static char * bignum_limit; /* 1st illegal address of bignum. */
static char * bignum_high; /* Highest char of bignum. */
/* May point to (bignum_start-1). */
/* Never >= bignum_limit. */
static char *old_buffer = 0; /* JF a hack */
static char *old_input;
static char *old_limit;
#ifndef WORKING_DOT_WORD
struct broken_word *broken_words;
int new_broken_words = 0;
#endif
static void grow_bignum ();
static int next_char_of_string ();
\f
void
read_begin()
{
pobegin();
obstack_begin( &notes, 5000 );
#define BIGNUM_BEGIN_SIZE (16)
bignum_low = xmalloc((long)BIGNUM_BEGIN_SIZE);
bignum_limit = bignum_low + BIGNUM_BEGIN_SIZE;
}
\f
/* set up pseudo-op tables */
static struct hash_control *
po_hash = NULL; /* use before set up: NULL-> address error */
void s_abort(), s_align(), s_comm(), s_data();
void s_desc(), s_even(), s_file(), s_fill();
void s_globl(), s_lcomm(), s_line(), s_lsym();
void s_org(), s_set(), s_space(), s_text();
#ifdef VMS
char const_flag = 0;
void s_const();
#endif
#ifdef DONTDEF
void s_gdbline(), s_gdblinetab();
void s_gdbbeg(), s_gdbblock(), s_gdbend(), s_gdbsym();
#endif
void stringer();
void cons();
void float_cons();
void big_cons();
void stab();
static const pseudo_typeS
potable[] =
{
{ "abort", s_abort, 0 },
{ "align", s_align, 0 },
{ "ascii", stringer, 0 },
{ "asciz", stringer, 1 },
{ "byte", cons, 1 },
{ "comm", s_comm, 0 },
#ifdef VMS
{ "const", s_const, 0 },
#endif
{ "data", s_data, 0 },
{ "desc", s_desc, 0 },
{ "double", float_cons, 'd' },
{ "file", s_file, 0 },
{ "fill", s_fill, 0 },
{ "float", float_cons, 'f' },
#ifdef DONTDEF
{ "gdbbeg", s_gdbbeg, 0 },
{ "gdbblock", s_gdbblock, 0 },
{ "gdbend", s_gdbend, 0 },
{ "gdbsym", s_gdbsym, 0 },
{ "gdbline", s_gdbline, 0 },
{ "gdblinetab",s_gdblinetab, 0 },
#endif
{ "globl", s_globl, 0 },
{ "int", cons, 4 },
{ "lcomm", s_lcomm, 0 },
{ "line", s_line, 0 },
{ "long", cons, 4 },
{ "lsym", s_lsym, 0 },
{ "octa", big_cons, 16 },
{ "org", s_org, 0 },
{ "quad", big_cons, 8 },
{ "set", s_set, 0 },
{ "short", cons, 2 },
{ "single", float_cons, 'f' },
{ "space", s_space, 0 },
{ "stabd", stab, 'd' },
{ "stabn", stab, 'n' },
{ "stabs", stab, 's' },
{ "text", s_text, 0 },
#ifndef SPARC
{ "word", cons, 2 },
#endif
{ NULL} /* end sentinel */
};
static void
pobegin()
{
char * errtxt; /* error text */
const pseudo_typeS * pop;
po_hash = hash_new();
errtxt = ""; /* OK so far */
for (pop=potable; pop->poc_name && !*errtxt; pop++)
{
errtxt = hash_insert (po_hash, pop->poc_name, (char *)pop);
}
for(pop=md_pseudo_table; pop->poc_name && !*errtxt; pop++)
errtxt = hash_insert (po_hash, pop->poc_name, (char *)pop);
if (*errtxt)
{
as_fatal ("error constructing pseudo-op table");
}
} /* pobegin() */
\f
/* read_a_source_file()
*
* File has already been opened, and will be closed by our caller.
*
* We read the file, putting things into a web that
* represents what we have been reading.
*/
void
read_a_source_file (buffer)
char * buffer; /* 1st character of each buffer of lines is here. */
{
register char c;
register char * s; /* string of symbol, '\0' appended */
register int temp;
/* register struct frag * fragP; JF unused */ /* a frag we just made */
pseudo_typeS *pop;
#ifdef DONTDEF
void gdb_block_beg();
void gdb_block_position();
void gdb_block_end();
void gdb_symbols_fixup();
#endif
subseg_new (SEG_TEXT, 0);
while ( buffer_limit = input_scrub_next_buffer (&buffer) )
{ /* We have another line to parse. */
know( buffer_limit [-1] == '\n' ); /* Must have a sentinel. */
input_line_pointer = buffer;
contin: /* JF this goto is my fault I admit it. Someone brave please re-write
the whole input section here? Pleeze??? */
while ( input_line_pointer < buffer_limit )
{ /* We have more of this buffer to parse. */
/*
* We now have input_line_pointer -> 1st char of next line.
* If input_line_pointer [-1] == '\n' then we just
* scanned another line: so bump line counters.
*/
if (input_line_pointer [-1] == '\n')
{
bump_line_counters ();
}
/*
* We are at the begining of a line, or similar place.
* We expect a well-formed assembler statement.
* A "symbol-name:" is a statement.
*
* Depending on what compiler is used, the order of these tests
* may vary to catch most common case 1st.
* Each test is independent of all other tests at the (top) level.
* PLEASE make a compiler that doesn't use this assembler.
* It is crufty to waste a compiler's time encoding things for this
* assembler, which then wastes more time decoding it.
* (And communicating via (linear) files is silly!
* If you must pass stuff, please pass a tree!)
*/
if ( (c= * input_line_pointer ++) == '\t' || c == ' ' || c=='\f')
{
c = * input_line_pointer ++;
}
know( c != ' ' ); /* No further leading whitespace. */
/*
* C is the 1st significant character.
* Input_line_pointer points after that character.
*/
if ( is_name_beginner(c) )
{ /* want user-defined label or pseudo/opcode */
s = -- input_line_pointer;
c = get_symbol_end(); /* name's delimiter */
/*
* C is character after symbol.
* That character's place in the input line is now '\0'.
* S points to the beginning of the symbol.
* [In case of pseudo-op, s -> '.'.]
* Input_line_pointer -> '\0' where c was.
*/
if ( c == ':' )
{
if (flagseen['g'])
/* set line number for function definition */
funcstab(s);
colon(s); /* user-defined label */
* input_line_pointer ++ = ':'; /* Put ':' back for error messages' sake. */
/* Input_line_pointer -> after ':'. */
SKIP_WHITESPACE();
}
else if(c=='=' || input_line_pointer[1]=='=') /* JF deal with FOO=BAR */
{
equals(s);
demand_empty_rest_of_line();
}
else
{ /* expect pseudo-op or machine instruction */
if ( *s=='.' )
{
/*
* PSEUDO - OP.
*
* WARNING: c has next char, which may be end-of-line.
* We lookup the pseudo-op table with s+1 because we
* already know that the pseudo-op begins with a '.'.
*/
pop= (pseudo_typeS *) hash_find (po_hash, s+1);
/* Print the error msg now, while we still can */
if(!pop)
as_bad("Unknown pseudo-op: '%s'",s);
/* Put it back for error messages etc. */
* input_line_pointer = c;
/* The following skip of whitespace is compulsory. */
/* A well shaped space is sometimes all that seperates keyword from operands. */
if ( c == ' ' || c == '\t' )
{ /* Skip seperator after keyword. */
input_line_pointer ++;
}
/*
* Input_line is restored.
* Input_line_pointer -> 1st non-blank char
* after pseudo-operation.
*/
if(!pop) {
ignore_rest_of_line();
break;
}
else
(*pop->poc_handler)(pop->poc_val);
}
else
{ /* machine instruction */
/* If source file debugging, emit a stab. */
if (flagseen['g'])
linestab();
/* WARNING: c has char, which may be end-of-line. */
/* Also: input_line_pointer -> `\0` where c was. */
* input_line_pointer = c;
while ( ! is_end_of_line [* input_line_pointer] )
{
input_line_pointer ++;
}
c = * input_line_pointer;
* input_line_pointer = '\0';
md_assemble (s); /* Assemble 1 instruction. */
* input_line_pointer ++ = c;
/* We resume loop AFTER the end-of-line from this instruction */
} /* if (*s=='.') */
} /* if c==':' */
continue;
} /* if (is_name_beginner(c) */
if ( is_end_of_line [c] )
{ /* empty statement */
continue;
}
if ( isdigit(c) )
{ /* local label ("4:") */
temp = c - '0';
#ifdef SUN_ASM_SYNTAX
if( *input_line_pointer=='$')
input_line_pointer++;
#endif
if ( * input_line_pointer ++ == ':' )
{
local_colon (temp);
}
else
{
as_bad( "Spurious digit %d.", temp);
input_line_pointer -- ;
ignore_rest_of_line();
}
continue;
}
if(c && index(line_comment_chars,c)) { /* Its a comment. Better say APP or NO_APP */
char *ends;
char *strstr();
char *new_buf;
char *new_tmp;
int new_length;
char *tmp_buf = 0;
extern char *scrub_string,*scrub_last_string;
int scrub_from_string();
void scrub_to_string();
bump_line_counters();
s=input_line_pointer;
if(strncmp(s,"APP\n",4))
continue; /* We ignore it */
s+=4;
ends=strstr(s,"#NO_APP\n");
if(!ends) {
int tmp_len;
int num;
/* The end of the #APP wasn't in this buffer. We
keep reading in buffers until we find the #NO_APP
that goes with this #APP There is one. The specs
guarentee it. . .*/
tmp_len=buffer_limit-s;
tmp_buf=xmalloc(tmp_len);
bcopy(s,tmp_buf,tmp_len);
do {
new_tmp = input_scrub_next_buffer(&buffer);
if(!new_tmp)
break;
else
buffer_limit = new_tmp;
input_line_pointer = buffer;
ends = strstr(buffer,"#NO_APP\n");
if(ends)
num=ends-buffer;
else
num=buffer_limit-buffer;
tmp_buf=xrealloc(tmp_buf,tmp_len+num);
bcopy(buffer,tmp_buf+tmp_len,num);
tmp_len+=num;
} while(!ends);
input_line_pointer= ends ? ends+8 : NULL;
s=tmp_buf;
ends=s+tmp_len;
} else {
input_line_pointer=ends+8;
}
new_buf=xmalloc(100);
new_length=100;
new_tmp=new_buf;
scrub_string=s;
scrub_last_string = ends;
for(;;) {
int ch;
ch=do_scrub_next_char(scrub_from_string,scrub_to_string);
if(ch==EOF) break;
*new_tmp++=ch;
if(new_tmp==new_buf+new_length) {
new_buf=xrealloc(new_buf,new_length+100);
new_tmp=new_buf+new_length;
new_length+=100;
}
}
if(tmp_buf)
free(tmp_buf);
old_buffer=buffer;
old_input=input_line_pointer;
old_limit=buffer_limit;
buffer=new_buf;
input_line_pointer=new_buf;
buffer_limit=new_tmp;
continue;
}
as_bad("Junk character %d.",c);
ignore_rest_of_line();
} /* while (input_line_pointer<buffer_limit )*/
if(old_buffer) {
bump_line_counters();
if(old_input == 0)
return;
buffer=old_buffer;
input_line_pointer=old_input;
buffer_limit=old_limit;
old_buffer = 0;
goto contin;
}
} /* while (more bufrers to scan) */
} /* read_a_source_file() */
void
s_abort()
{
as_fatal(".abort detected. Abandoning ship.");
}
#ifdef OTHER_ALIGN
static void
s_align()
{
register unsigned int temp;
register long int temp_fill;
unsigned int i;
temp = get_absolute_expression ();
#define MAX_ALIGNMENT (1 << 15)
if ( temp > MAX_ALIGNMENT ) {
as_bad("Alignment too large: %d. assumed.", temp = MAX_ALIGNMENT);
}
/*
* For the sparc, `.align (1<<n)' actually means `.align n'
* so we have to convert it.
*/
if (temp != 0) {
for (i = 0; (temp & 1) == 0; temp >>= 1, ++i)
;
}
if (temp != 1)
as_bad("Alignment not a power of 2");
temp = i;
if (*input_line_pointer == ',') {
input_line_pointer ++;
temp_fill = get_absolute_expression ();
} else {
temp_fill = 0;
}
/* Only make a frag if we HAVE to. . . */
if (temp && ! need_pass_2)
frag_align (temp, (int)temp_fill);
demand_empty_rest_of_line();
}
#else
void
s_align()
{
register int temp;
register long int temp_fill;
temp = get_absolute_expression ();
#define MAX_ALIGNMENT (15)
if ( temp > MAX_ALIGNMENT )
as_bad("Alignment too large: %d. assumed.", temp = MAX_ALIGNMENT);
else if ( temp < 0 ) {
as_bad("Alignment negative. 0 assumed.");
temp = 0;
}
if ( *input_line_pointer == ',' ) {
input_line_pointer ++;
temp_fill = get_absolute_expression ();
} else
temp_fill = 0;
/* Only make a frag if we HAVE to. . . */
if ( temp && ! need_pass_2 )
frag_align (temp, (int)temp_fill);
demand_empty_rest_of_line();
}
#endif
void
s_comm()
{
register char *name;
register char c;
register char *p;
register int temp;
register symbolS * symbolP;
name = input_line_pointer;
c = get_symbol_end();
/* just after name is now '\0' */
p = input_line_pointer;
*p = c;
SKIP_WHITESPACE();
if ( * input_line_pointer != ',' ) {
as_bad("Expected comma after symbol-name");
ignore_rest_of_line();
return;
}
input_line_pointer ++; /* skip ',' */
if ( (temp = get_absolute_expression ()) < 0 ) {
as_warn(".COMMon length (%d.) <0! Ignored.", temp);
ignore_rest_of_line();
return;
}
*p = 0;
symbolP = symbol_find_or_make (name);
*p = c;
if ( (symbolP -> sy_type & N_TYPE) != N_UNDF ||
symbolP -> sy_other != 0 || symbolP -> sy_desc != 0) {
as_warn( "Ignoring attempt to re-define symbol");
ignore_rest_of_line();
return;
}
if (symbolP -> sy_value) {
if (symbolP -> sy_value != temp)
as_warn( "Length of .comm \"%s\" is already %d. Not changed to %d.",
symbolP -> sy_name, symbolP -> sy_value, temp);
} else {
symbolP -> sy_value = temp;
symbolP -> sy_type |= N_EXT;
}
#ifdef VMS
if(!temp)
symbolP->sy_other = const_flag;
#endif
know( symbolP -> sy_frag == &zero_address_frag );
demand_empty_rest_of_line();
}
#ifdef VMS
void
s_const()
{
register int temp;
temp = get_absolute_expression ();
subseg_new (SEG_DATA, (subsegT)temp);
const_flag = 1;
demand_empty_rest_of_line();
}
#endif
void
s_data()
{
register int temp;
temp = get_absolute_expression ();
subseg_new (SEG_DATA, (subsegT)temp);
#ifdef VMS
const_flag = 0;
#endif
demand_empty_rest_of_line();
}
void
s_desc()
{
register char *name;
register char c;
register char *p;
register symbolS * symbolP;
register int temp;
/*
* Frob invented at RMS' request. Set the n_desc of a symbol.
*/
name = input_line_pointer;
c = get_symbol_end();
p = input_line_pointer;
symbolP = symbol_table_lookup (name);
* p = c;
SKIP_WHITESPACE();
if ( * input_line_pointer != ',' ) {
*p = 0;
as_bad("Expected comma after name \"%s\"", name);
*p = c;
ignore_rest_of_line();
} else {
input_line_pointer ++;
temp = get_absolute_expression ();
*p = 0;
symbolP = symbol_find_or_make (name);
*p = c;
symbolP -> sy_desc = temp;
}
demand_empty_rest_of_line();
}
void
s_file()
{
register char *s;
int length;
/* Some assemblers tolerate immediately following '"' */
if ( s = demand_copy_string( & length ) ) {
new_logical_line (s, -1);
demand_empty_rest_of_line();
}
}
void
s_fill()
{
long int temp_repeat;
long int temp_size;
register long int temp_fill;
char *p;
if ( get_absolute_expression_and_terminator(& temp_repeat) != ',' ) {
input_line_pointer --; /* Backup over what was not a ','. */
as_warn("Expect comma after rep-size in .fill");
ignore_rest_of_line();
return;
}
if ( get_absolute_expression_and_terminator( & temp_size) != ',' ) {
input_line_pointer --; /* Backup over what was not a ','. */
as_warn("Expected comma after size in .fill");
ignore_rest_of_line();
return;
}
/*
* This is to be compatible with BSD 4.2 AS, not for any rational reason.
*/
#define BSD_FILL_SIZE_CROCK_8 (8)
if ( temp_size > BSD_FILL_SIZE_CROCK_8 ) {
as_bad(".fill size clamped to %d.", BSD_FILL_SIZE_CROCK_8);
temp_size = BSD_FILL_SIZE_CROCK_8 ;
} if ( temp_size < 0 ) {
as_warn("Size negative: .fill ignored.");
temp_size = 0;
} else if ( temp_repeat <= 0 ) {
as_warn("Repeat < 0, .fill ignored");
temp_size = 0;
}
temp_fill = get_absolute_expression ();
if ( temp_size && !need_pass_2 ) {
p = frag_var (rs_fill, (int)temp_size, (int)temp_size, (relax_substateT)0, (symbolS *)0, temp_repeat, (char *)0);
bzero (p, (int)temp_size);
/*
* The magic number BSD_FILL_SIZE_CROCK_4 is from BSD 4.2 VAX flavoured AS.
* The following bizzare behaviour is to be compatible with above.
* I guess they tried to take up to 8 bytes from a 4-byte expression
* and they forgot to sign extend. Un*x Sux.
*/
#define BSD_FILL_SIZE_CROCK_4 (4)
md_number_to_chars (p, temp_fill, temp_size > BSD_FILL_SIZE_CROCK_4 ? BSD_FILL_SIZE_CROCK_4 : (int)temp_size);
/*
* Note: .fill (),0 emits no frag (since we are asked to .fill 0 bytes)
* but emits no error message because it seems a legal thing to do.
* It is a degenerate case of .fill but could be emitted by a compiler.
*/
}
demand_empty_rest_of_line();
}
#ifdef DONTDEF
void
s_gdbbeg()
{
register int temp;
temp = get_absolute_expression ();
if (temp < 0)
as_warn( "Block number <0. Ignored." );
else if (flagseen ['G'])
gdb_block_beg ( (long int) temp, frag_now, (long int)(obstack_next_free(& frags) - frag_now -> fr_literal));
demand_empty_rest_of_line ();
}
void
s_gdbblock()
{
register int position;
int temp;
if (get_absolute_expression_and_terminator (&temp) != ',') {
as_warn( "expected comma before position in .gdbblock");
--input_line_pointer;
ignore_rest_of_line ();
return;
}
position = get_absolute_expression ();
if (flagseen ['G'])
gdb_block_position ((long int) temp, (long int) position);
demand_empty_rest_of_line ();
}
void
s_gdbend()
{
register int temp;
temp = get_absolute_expression ();
if (temp < 0)
as_warn( "Block number <0. Ignored." );
else if (flagseen ['G'])
gdb_block_end ( (long int) temp, frag_now, (long int)(obstack_next_free(& frags) - frag_now -> fr_literal));
demand_empty_rest_of_line ();
}
void
s_gdbsym()
{
register char *name,
*p;
register char c;
register symbolS * symbolP;
register int temp;
name = input_line_pointer;
c = get_symbol_end();
p = input_line_pointer;
symbolP = symbol_find_or_make (name);
*p = c;
SKIP_WHITESPACE();
if ( * input_line_pointer != ',' ) {
as_warn("Expected comma after name");
ignore_rest_of_line();
return;
}
input_line_pointer ++;
if ( (temp = get_absolute_expression ()) < 0 ) {
as_warn("Bad GDB symbol file offset (%d.) <0! Ignored.", temp);
ignore_rest_of_line();
return;
}
if (flagseen ['G'])
gdb_symbols_fixup (symbolP, (long int)temp);
demand_empty_rest_of_line ();
}
void
s_gdbline()
{
int file_number,
lineno;
if(get_absolute_expression_and_terminator(&file_number) != ',') {
as_warn("expected comman after filenum in .gdbline");
ignore_rest_of_line();
return;
}
lineno=get_absolute_expression();
if(flagseen['G'])
gdb_line(file_number,lineno);
demand_empty_rest_of_line();
}
void
s_gdblinetab()
{
int file_number,
offset;
if(get_absolute_expression_and_terminator(&file_number) != ',') {
as_warn("expected comman after filenum in .gdblinetab");
ignore_rest_of_line();
return;
}
offset=get_absolute_expression();
if(flagseen['G'])
gdb_line_tab(file_number,offset);
demand_empty_rest_of_line();
}
#endif
void
s_globl()
{
register char *name;
register int c;
register symbolS * symbolP;
do {
name = input_line_pointer;
c = get_symbol_end();
symbolP = symbol_find_or_make (name);
* input_line_pointer = c;
SKIP_WHITESPACE();
symbolP -> sy_type |= N_EXT;
if(c==',') {
input_line_pointer++;
SKIP_WHITESPACE();
if(*input_line_pointer=='\n')
c='\n';
}
} while(c==',');
demand_empty_rest_of_line();
}
void
s_lcomm()
{
register char *name;
register char c;
register char *p;
register int temp;
register symbolS * symbolP;
name = input_line_pointer;
c = get_symbol_end();
p = input_line_pointer;
*p = c;
SKIP_WHITESPACE();
if ( * input_line_pointer != ',' ) {
as_warn("Expected comma after name");
ignore_rest_of_line();
return;
}
input_line_pointer ++;
if ( (temp = get_absolute_expression ()) < 0 ) {
as_warn("BSS length (%d.) <0! Ignored.", temp);
ignore_rest_of_line();
return;
}
*p = 0;
symbolP = symbol_find_or_make (name);
*p = c;
if ( symbolP -> sy_other == 0
&& symbolP -> sy_desc == 0
&& ( ( symbolP -> sy_type == N_BSS
&& symbolP -> sy_value == local_bss_counter)
|| ( (symbolP -> sy_type & N_TYPE) == N_UNDF
&& symbolP -> sy_value == 0))) {
symbolP -> sy_value = local_bss_counter;
symbolP -> sy_type = N_BSS;
symbolP -> sy_frag = & bss_address_frag;
local_bss_counter += temp;
} else
as_warn( "Ignoring attempt to re-define symbol from %d. to %d.",
symbolP -> sy_value, local_bss_counter );
demand_empty_rest_of_line();
}
void
s_line()
{
/* Assume delimiter is part of expression. */
/* BSD4.2 as fails with delightful bug, so we */
/* are not being incompatible here. */
new_logical_line ((char *)NULL, (int)(get_absolute_expression ()));
demand_empty_rest_of_line();
}
void
s_long()
{
cons(4);
}
void
s_int()
{
cons(4);
}
void
s_lsym()
{
register char *name;
register char c;
register char *p;
register segT segment;
expressionS exp;
register symbolS *symbolP;
/* we permit ANY expression: BSD4.2 demands constants */
name = input_line_pointer;
c = get_symbol_end();
p = input_line_pointer;
*p = c;
SKIP_WHITESPACE();
if ( * input_line_pointer != ',' ) {
*p = 0;
as_warn("Expected comma after name \"%s\"", name);
*p = c;
ignore_rest_of_line();
return;
}
input_line_pointer ++;
segment = expression (& exp);
if ( segment != SEG_ABSOLUTE && segment != SEG_DATA &&
segment != SEG_TEXT && segment != SEG_BSS) {
as_bad("Bad expression: %s", seg_name [(int)segment]);
ignore_rest_of_line();
return;
}
know( segment == SEG_ABSOLUTE || segment == SEG_DATA || segment == SEG_TEXT || segment == SEG_BSS );
*p = 0;
symbolP = symbol_new (name,(unsigned char)(seg_N_TYPE [(int) segment]),
0, 0, (valueT)(exp . X_add_number), & zero_address_frag);
*p = c;
demand_empty_rest_of_line();
}
void
s_org()
{
register segT segment;
expressionS exp;
register long int temp_fill;
register char *p;
/*
* Don't believe the documentation of BSD 4.2 AS.
* There is no such thing as a sub-segment-relative origin.
* Any absolute origin is given a warning, then assumed to be segment-relative.
* Any segmented origin expression ("foo+42") had better be in the right
* segment or the .org is ignored.
*
* BSD 4.2 AS warns if you try to .org backwards. We cannot because we
* never know sub-segment sizes when we are reading code.
* BSD will crash trying to emit -ve numbers of filler bytes in certain
* .orgs. We don't crash, but see as-write for that code.
*/
/*
* Don't make frag if need_pass_2==TRUE.
*/
segment = get_known_segmented_expression(& exp);
if ( *input_line_pointer == ',' ) {
input_line_pointer ++;
temp_fill = get_absolute_expression ();
} else
temp_fill = 0;
if ( ! need_pass_2 ) {
if (segment != now_seg && segment != SEG_ABSOLUTE)
as_warn("Illegal segment \"%s\". Segment \"%s\" assumed.",
seg_name [(int) segment], seg_name [(int) now_seg]);
p = frag_var (rs_org, 1, 1, (relax_substateT)0, exp . X_add_symbol,
exp . X_add_number, (char *)0);
* p = temp_fill;
} /* if (ok to make frag) */
demand_empty_rest_of_line();
}
void
s_set()
{
register char *name;
register char delim;
register char *end_name;
register symbolS *symbolP;
/*
* Especial apologies for the random logic:
* this just grew, and could be parsed much more simply!
* Dean in haste.
*/
name = input_line_pointer;
delim = get_symbol_end();
end_name = input_line_pointer;
*end_name = delim;
SKIP_WHITESPACE();
if ( * input_line_pointer != ',' ) {
*end_name = 0;
as_warn("Expected comma after name \"%s\"", name);
*end_name = delim;
ignore_rest_of_line();
return;
}
input_line_pointer ++;
*end_name = 0;
if(name[0]=='.' && name[1]=='\0') {
/* Turn '. = mumble' into a .org mumble */
register segT segment;
expressionS exp;
register char *ptr;
segment = get_known_segmented_expression(& exp);
if ( ! need_pass_2 ) {
if (segment != now_seg && segment != SEG_ABSOLUTE)
as_warn("Illegal segment \"%s\". Segment \"%s\" assumed.",
seg_name [(int) segment], seg_name [(int) now_seg]);
ptr = frag_var (rs_org, 1, 1, (relax_substateT)0, exp.X_add_symbol,
exp.X_add_number, (char *)0);
*ptr= 0;
} /* if (ok to make frag) */
*end_name = delim;
return;
}
symbolP = symbol_find_or_make (name);
*end_name = delim;
pseudo_set (symbolP);
demand_empty_rest_of_line ();
}
void
s_space()
{
long int temp_repeat;
register long int temp_fill;
register char *p;
/* Just like .fill, but temp_size = 1 */
if ( get_absolute_expression_and_terminator( & temp_repeat) == ',' ) {
temp_fill = get_absolute_expression ();
} else {
input_line_pointer --; /* Backup over what was not a ','. */
temp_fill = 0;
}
if ( temp_repeat <= 0 ) {
as_warn("Repeat < 0, .space ignored");
ignore_rest_of_line();
return;
}
if ( ! need_pass_2 ) {
p = frag_var (rs_fill, 1, 1, (relax_substateT)0, (symbolS *)0,
temp_repeat, (char *)0);
* p = temp_fill;
}
demand_empty_rest_of_line();
}
void
s_text()
{
register int temp;
temp = get_absolute_expression ();
subseg_new (SEG_TEXT, (subsegT)temp);
demand_empty_rest_of_line();
}
\f
/*( JF was static, but can't be if machine dependent pseudo-ops are to use it */
void
demand_empty_rest_of_line()
{
SKIP_WHITESPACE();
if ( is_end_of_line [* input_line_pointer] )
{
input_line_pointer ++;
}
else
{
ignore_rest_of_line();
}
/* Return having already swallowed end-of-line. */
} /* Return pointing just after end-of-line. */
void
ignore_rest_of_line() /* For suspect lines: gives warning. */
{
if ( ! is_end_of_line [* input_line_pointer])
{
as_warn("Rest of line ignored. 1st junk character valued %d (%c)."
, * input_line_pointer, *input_line_pointer);
while ( input_line_pointer < buffer_limit
&& ! is_end_of_line [* input_line_pointer] )
{
input_line_pointer ++;
}
}
input_line_pointer ++; /* Return pointing just after end-of-line. */
know( is_end_of_line [input_line_pointer [-1]] );
}
\f
/*
* stab()
*
* Handle .stabX directives, which used to be open-coded.
* So much creeping featurism overloaded the semantics that we decided
* to put all .stabX thinking in one place. Here.
*
* We try to make any .stabX directive legal. Other people's AS will often
* do assembly-time consistency checks: eg assigning meaning to n_type bits
* and "protecting" you from setting them to certain values. (They also zero
* certain bits before emitting symbols. Tut tut.)
*
* If an expression is not absolute we either gripe or use the relocation
* information. Other people's assemblers silently forget information they
* don't need and invent information they need that you didn't supply.
*
* .stabX directives always make a symbol table entry. It may be junk if
* the rest of your .stabX directive is malformed.
*/
static void
stab (what)
int what;
{
register symbolS * symbolP;
register char * string;
int saved_type;
int length;
int goof; /* TRUE if we have aborted. */
long int longint;
/*
* Enter with input_line_pointer pointing past .stabX and any following
* whitespace.
*/
goof = FALSE; /* JF who forgot this?? */
if (what == 's') {
string = demand_copy_C_string (& length);
SKIP_WHITESPACE();
if (* input_line_pointer == ',')
input_line_pointer ++;
else {
as_warn( "I need a comma after symbol's name" );
goof = TRUE;
}
} else
string = "";
/*
* Input_line_pointer->after ','. String -> symbol name.
*/
if (! goof) {
symbolP = symbol_new (string, 0,0,0,0,(struct frag *)0);
switch (what) {
case 'd':
symbolP->sy_name = NULL; /* .stabd feature. */
symbolP->sy_value = obstack_next_free(& frags) - frag_now->fr_literal;
symbolP->sy_frag = frag_now;
break;
case 'n':
symbolP->sy_frag = &zero_address_frag;
break;
case 's':
symbolP->sy_frag = & zero_address_frag;
break;
default:
BAD_CASE( what );
break;
}
if (get_absolute_expression_and_terminator (& longint) == ',')
symbolP->sy_type = saved_type = longint;
else {
as_warn( "I want a comma after the n_type expression" );
goof = TRUE;
input_line_pointer --; /* Backup over a non-',' char. */
}
}
if (! goof) {
if (get_absolute_expression_and_terminator (& longint) == ',')
symbolP->sy_other = longint;
else {
as_warn( "I want a comma after the n_other expression" );
goof = TRUE;
input_line_pointer --; /* Backup over a non-',' char. */
}
}
if (! goof) {
symbolP->sy_desc = get_absolute_expression ();
if (what == 's' || what == 'n') {
if (* input_line_pointer != ',') {
as_warn( "I want a comma after the n_desc expression" );
goof = TRUE;
} else {
input_line_pointer ++;
}
}
}
if ((! goof) && (what=='s' || what=='n')) {
pseudo_set (symbolP);
symbolP->sy_type = saved_type;
}
if (goof)
ignore_rest_of_line ();
else
demand_empty_rest_of_line ();
}
\f
/*
* pseudo_set()
*
* In: Pointer to a symbol.
* Input_line_pointer -> expression.
*
* Out: Input_line_pointer -> just after any whitespace after expression.
* Tried to set symbol to value of expression.
* Will change sy_type, sy_value, sy_frag;
* May set need_pass_2 == TRUE.
*/
static void
pseudo_set (symbolP)
symbolS * symbolP;
{
expressionS exp;
register segT segment;
int ext;
know( symbolP ); /* NULL pointer is logic error. */
ext=(symbolP->sy_type&N_EXT);
if ((segment = expression( & exp )) == SEG_NONE)
{
as_warn( "Missing expression: absolute 0 assumed" );
exp . X_seg = SEG_ABSOLUTE;
exp . X_add_number = 0;
}
switch (segment)
{
case SEG_BIG:
as_warn( "%s number illegal. Absolute 0 assumed.",
exp . X_add_number > 0 ? "Bignum" : "Floating-Point" );
symbolP -> sy_type = N_ABS | ext;
symbolP -> sy_value = 0;
symbolP -> sy_frag = & zero_address_frag;
break;
case SEG_NONE:
as_warn("No expression: Using absolute 0");
symbolP -> sy_type = N_ABS | ext;
symbolP -> sy_value = 0;
symbolP -> sy_frag = & zero_address_frag;
break;
case SEG_DIFFERENCE:
if (exp.X_add_symbol && exp.X_subtract_symbol
&& (exp.X_add_symbol->sy_type & N_TYPE)
== (exp.X_subtract_symbol->sy_type & N_TYPE)) {
if(exp.X_add_symbol->sy_frag != exp.X_subtract_symbol->sy_frag) {
as_bad("Unknown expression: symbols %s and %s are in different frags.",exp.X_add_symbol->sy_name, exp.X_subtract_symbol->sy_name);
need_pass_2++;
}
exp.X_add_number+=exp.X_add_symbol->sy_value - exp.X_subtract_symbol->sy_value;
} else
as_warn( "Complex expression. Absolute segment assumed." );
case SEG_ABSOLUTE:
symbolP -> sy_type = N_ABS | ext;
symbolP -> sy_value = exp . X_add_number;
symbolP -> sy_frag = & zero_address_frag;
break;
case SEG_DATA:
case SEG_TEXT:
case SEG_BSS:
symbolP -> sy_type = seg_N_TYPE [(int) segment] | ext;
symbolP -> sy_value= exp . X_add_number + exp . X_add_symbol -> sy_value;
symbolP -> sy_frag = exp . X_add_symbol -> sy_frag;
break;
case SEG_PASS1: /* Not an error. Just try another pass. */
symbolP->sy_forward=exp.X_add_symbol;
as_warn("Unknown expression");
know( need_pass_2 == TRUE );
break;
case SEG_UNKNOWN:
symbolP->sy_forward=exp.X_add_symbol;
/* as_warn("unknown symbol"); */
/* need_pass_2 = TRUE; */
break;
default:
BAD_CASE( segment );
break;
}
}
\f
/*
* stabs(file), stabf(func) and stabd(line) -- for the purpose of
* source file debugging of assembly files, generate file,
* function and line number stabs, respectively.
* These functions have corresponding functions named
* filestab(), funcstab() and linestab() in input-scrub.c,
* where logical files and logical line numbers are handled.
*/
#include <stab.h>
stabs(file)
char *file;
{
/* .stabs "file",100,0,0,. */
(void) symbol_new(file,
N_SO,
0,
0,
obstack_next_free(& frags) - frag_now->fr_literal,
frag_now);
}
stabf(func)
char *func;
{
symbolS *symbolP;
static int void_undefined = 1;
/* crudely filter uninteresting labels: require an initial '_' */
if (*func++ != '_')
return;
/* assembly functions are assumed to have void type */
if (void_undefined)
{
/* .stabs "void:t15=15",128,0,0,0 */
(void) symbol_new("void:t1=1",
N_LSYM,
0,
0,
0,
&zero_address_frag);
void_undefined = 0;
}
/* .stabs "func:F1",36,0,0,. */
symbolP = symbol_new((char *) 0,
N_FUN,
0,
0,
obstack_next_free(& frags) - frag_now->fr_literal,
frag_now);
obstack_grow(&notes, func, strlen(func));
obstack_1grow(&notes, ':');
obstack_1grow(&notes, 'F');
obstack_1grow(&notes, '1');
obstack_1grow(&notes, '\0');
symbolP->sy_name = obstack_finish(&notes);
}
stabd(line)
unsigned line;
{
/* .stabd 68,0,line */
(void) symbol_new((char *)0,
N_SLINE,
0,
line,
obstack_next_free(& frags) - frag_now->fr_literal,
frag_now);
}
\f
/*
* cons()
*
* CONStruct more frag of .bytes, or .words etc.
* Should need_pass_2 be TRUE then emit no frag(s).
* This understands EXPRESSIONS, as opposed to big_cons().
*
* Bug (?)
*
* This has a split personality. We use expression() to read the
* value. We can detect if the value won't fit in a byte or word.
* But we can't detect if expression() discarded significant digits
* in the case of a long. Not worth the crocks required to fix it.
*/
void
cons(nbytes) /* worker to do .byte etc statements */
/* clobbers input_line_pointer, checks */
/* end-of-line. */
register int nbytes; /* 1=.byte, 2=.word, 4=.long */
{
register char c;
register long int mask; /* High-order bits we will left-truncate, */
/* but includes sign bit also. */
register long int get; /* what we get */
register long int use; /* get after truncation. */
register long int unmask; /* what bits we will store */
register char * p;
register segT segment;
expressionS exp;
#ifdef NS32K
void fix_new_ns32k();
#else
void fix_new();
#endif
/*
* Input_line_pointer -> 1st char after pseudo-op-code and could legally
* be a end-of-line. (Or, less legally an eof - which we cope with.)
*/
/* JF << of >= number of bits in the object is undefined. In particular
SPARC (Sun 4) has problems */
if(nbytes>=sizeof(long int))
mask = 0;
else
mask = ~0 << (BITS_PER_CHAR * nbytes); /* Don't store these bits. */
unmask = ~ mask; /* Do store these bits. */
#ifdef NEVER
"Do this mod if you want every overflow check to assume SIGNED 2's complement data.";
mask = ~ (unmask >> 1); /* Includes sign bit now. */
#endif
/*
* The following awkward logic is to parse ZERO or more expressions,
* comma seperated. Recall an expression includes its leading &
* trailing blanks. We fake a leading ',' if there is (supposed to
* be) a 1st expression, and keep demanding 1 expression for each ','.
*/
if (is_it_end_of_statement())
{
c = 0; /* Skip loop. */
input_line_pointer ++; /* Matches end-of-loop 'correction'. */
}
else
c = ','; /* Do loop. */
while ( c == ',' )
{
segment = expression( &exp ); /* At least scan over the expression. */
if ( ! need_pass_2 )
{ /* Still worthwhile making frags. */
/* Don't call this if we are going to junk this pass anyway! */
know( segment != SEG_PASS1 );
if ( segment == SEG_DIFFERENCE && exp . X_add_symbol == NULL )
{
as_warn( "Subtracting symbol \"%s\"(segment\"%s\") is too hard. Absolute segment assumed.",
exp . X_subtract_symbol -> sy_name,
seg_name [(int) N_TYPE_seg [exp . X_subtract_symbol -> sy_type & N_TYPE]]);
segment = SEG_ABSOLUTE;
/* Leave exp . X_add_number alone. */
}
p = frag_more (nbytes);
switch (segment)
{
case SEG_BIG:
as_warn( "%s number illegal. Absolute 0 assumed.",
exp . X_add_number > 0 ? "Bignum" : "Floating-Point");
md_number_to_chars (p, (long)0, nbytes);
break;
case SEG_NONE:
as_warn( "0 assumed for missing expression" );
exp . X_add_number = 0;
know( exp . X_add_symbol == NULL );
/* fall into SEG_ABSOLUTE */
case SEG_ABSOLUTE:
get = exp . X_add_number;
use = get & unmask;
if ( (get & mask) && (get & mask) != mask )
{ /* Leading bits contain both 0s & 1s. */
as_warn("Value x%x truncated to x%x.", get, use);
}
md_number_to_chars (p, use, nbytes); /* put bytes in right order. */
break;
case SEG_DIFFERENCE:
#ifndef WORKING_DOT_WORD
if(nbytes==2) {
struct broken_word *x;
x=(struct broken_word *)xmalloc(sizeof(struct broken_word));
x->next_broken_word=broken_words;
broken_words=x;
x->frag=frag_now;
x->word_goes_here=p;
x->dispfrag=0;
x->add=exp.X_add_symbol;
x->sub=exp.X_subtract_symbol;
x->addnum=exp.X_add_number;
x->added=0;
new_broken_words++;
break;
}
/* Else Fall through into. . . */
#endif
case SEG_BSS:
case SEG_UNKNOWN:
case SEG_TEXT:
case SEG_DATA:
#if defined(SPARC) || defined(I860)
fix_new (frag_now, p - frag_now -> fr_literal, nbytes,
exp . X_add_symbol, exp . X_subtract_symbol,
exp . X_add_number, 0, RELOC_32);
#endif
#ifdef NS32K
fix_new_ns32k (frag_now, p - frag_now -> fr_literal, nbytes,
exp . X_add_symbol, exp . X_subtract_symbol,
exp . X_add_number, 0, 0, 2, 0, 0);
#endif
#if !defined(SPARC) && !defined(NS32K) && !defined(I860)
fix_new (frag_now, p - frag_now -> fr_literal, nbytes,
exp . X_add_symbol, exp . X_subtract_symbol,
exp . X_add_number, 0);
#endif
break;
default:
BAD_CASE( segment );
break;
} /* switch(segment) */
} /* if(!need_pass_2) */
c = * input_line_pointer ++;
} /* while(c==',') */
input_line_pointer --; /* Put terminator back into stream. */
demand_empty_rest_of_line();
} /* cons() */
\f
/*
* big_cons()
*
* CONStruct more frag(s) of .quads, or .octa etc.
* Makes 0 or more new frags.
* If need_pass_2 == TRUE, generate no frag.
* This understands only bignums, not expressions. Cons() understands
* expressions.
*
* Constants recognised are '0...'(octal) '0x...'(hex) '...'(decimal).
*
* This creates objects with struct obstack_control objs, destroying
* any context objs held about a partially completed object. Beware!
*
*
* I think it sucks to have 2 different types of integers, with 2
* routines to read them, store them etc.
* It would be nicer to permit bignums in expressions and only
* complain if the result overflowed. However, due to "efficiency"...
*/
void
big_cons(nbytes) /* worker to do .quad etc statements */
/* clobbers input_line_pointer, checks */
/* end-of-line. */
register int nbytes; /* 8=.quad 16=.octa ... */
{
register char c; /* input_line_pointer -> c. */
register int radix;
register long int length; /* Number of chars in an object. */
register int digit; /* Value of 1 digit. */
register int carry; /* For multi-precision arithmetic. */
register int work; /* For multi-precision arithmetic. */
register char * p; /* For multi-precision arithmetic. */
extern char hex_value[]; /* In hex_value.c. */
/*
* The following awkward logic is to parse ZERO or more strings,
* comma seperated. Recall an expression includes its leading &
* trailing blanks. We fake a leading ',' if there is (supposed to
* be) a 1st expression, and keep demanding 1 expression for each ','.
*/
if (is_it_end_of_statement())
{
c = 0; /* Skip loop. */
}
else
{
c = ','; /* Do loop. */
-- input_line_pointer;
}
while (c == ',')
{
++ input_line_pointer;
SKIP_WHITESPACE();
c = * input_line_pointer;
/* C contains 1st non-blank character of what we hope is a number. */
if (c == '0')
{
c = * ++ input_line_pointer;
if (c == 'x' || c=='X')
{
c = * ++ input_line_pointer;
radix = 16;
}
else
{
radix = 8;
}
}
else
{
radix = 10;
}
/*
* This feature (?) is here to stop people worrying about
* mysterious zero constants: which is what they get when
* they completely omit digits.
*/
if (hex_value[c] >= radix)
{
as_warn( "Missing digits. 0 assumed." );
}
bignum_high = bignum_low - 1; /* Start constant with 0 chars. */
for( ; (digit = hex_value [c]) < radix; c = * ++ input_line_pointer)
{
/* Multiply existing number by radix, then add digit. */
carry = digit;
for (p=bignum_low; p <= bignum_high; p++)
{
work = (*p & MASK_CHAR) * radix + carry;
*p = work & MASK_CHAR;
carry = work >> BITS_PER_CHAR;
}
if (carry)
{
grow_bignum();
* bignum_high = carry & MASK_CHAR;
know( (carry & ~ MASK_CHAR) == 0);
}
}
length = bignum_high - bignum_low + 1;
if (length > nbytes)
{
as_warn( "Most significant bits truncated in integer constant." );
}
else
{
register long int leading_zeroes;
for(leading_zeroes = nbytes - length;
leading_zeroes;
leading_zeroes --)
{
grow_bignum();
* bignum_high = 0;
}
}
if (! need_pass_2)
{
p = frag_more (nbytes);
bcopy (bignum_low, p, (int)nbytes);
}
/* C contains character after number. */
SKIP_WHITESPACE();
c = * input_line_pointer;
/* C contains 1st non-blank character after number. */
}
demand_empty_rest_of_line();
} /* big_cons() */
static void
grow_bignum() /* Extend bignum by 1 char. */
{
register long int length;
bignum_high ++;
if (bignum_high >= bignum_limit)
{
length = bignum_limit - bignum_low;
bignum_low = xrealloc (bignum_low, length + length);
bignum_high = bignum_low + length;
bignum_limit = bignum_low + length + length;
}
} /* grow_bignum(); */
\f
/*
* float_cons()
*
* CONStruct some more frag chars of .floats .ffloats etc.
* Makes 0 or more new frags.
* If need_pass_2 == TRUE, no frags are emitted.
* This understands only floating literals, not expressions. Sorry.
*
* A floating constant is defined by atof_generic(), except it is preceded
* by 0d 0f 0g or 0h. After observing the STRANGE way my BSD AS does its
* reading, I decided to be incompatible. This always tries to give you
* rounded bits to the precision of the pseudo-op. Former AS did premature
* truncatation, restored noisy bits instead of trailing 0s AND gave you
* a choice of 2 flavours of noise according to which of 2 floating-point
* scanners you directed AS to use.
*
* In: input_line_pointer -> whitespace before, or '0' of flonum.
*
*/
void /* JF was static, but can't be if VAX.C is goning to use it */
float_cons(float_type) /* Worker to do .float etc statements. */
/* Clobbers input_line-pointer, checks end-of-line. */
register float_type; /* 'f':.ffloat ... 'F':.float ... */
{
register char * p;
register char c;
int length; /* Number of chars in an object. */
register char * err; /* Error from scanning floating literal. */
char temp [MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT];
/*
* The following awkward logic is to parse ZERO or more strings,
* comma seperated. Recall an expression includes its leading &
* trailing blanks. We fake a leading ',' if there is (supposed to
* be) a 1st expression, and keep demanding 1 expression for each ','.
*/
if (is_it_end_of_statement())
{
c = 0; /* Skip loop. */
++ input_line_pointer; /* -> past termintor. */
}
else
{
c = ','; /* Do loop. */
}
while (c == ',')
{
/* input_line_pointer -> 1st char of a flonum (we hope!). */
SKIP_WHITESPACE();
/* Skip any 0{letter} that may be present. Don't even check if the
* letter is legal. Someone may invent a "z" format and this routine
* has no use for such information. Lusers beware: you get
* diagnostics if your input is ill-conditioned.
*/
if(input_line_pointer[0]=='0' && isalpha(input_line_pointer[1]))
input_line_pointer+=2;
err = md_atof (float_type, temp, &length);
know( length <= MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT);
know( length > 0 );
if (* err)
{
as_warn( "Bad floating literal: %s", err);
ignore_rest_of_line();
/* Input_line_pointer -> just after end-of-line. */
c = 0; /* Break out of loop. */
}
else
{
if ( ! need_pass_2)
{
p = frag_more (length);
bcopy (temp, p, length);
}
SKIP_WHITESPACE();
c = * input_line_pointer ++;
/* C contains 1st non-white character after number. */
/* input_line_pointer -> just after terminator (c). */
}
}
-- input_line_pointer; /* -> terminator (is not ','). */
demand_empty_rest_of_line();
} /* float_cons() */
\f
/*
* stringer()
*
* We read 0 or more ',' seperated, double-quoted strings.
*
* Caller should have checked need_pass_2 is FALSE because we don't check it.
*/
static void
stringer(append_zero) /* Worker to do .ascii etc statements. */
/* Checks end-of-line. */
register int append_zero; /* 0: don't append '\0', else 1 */
{
/* register char * p; JF unused */
/* register int length; JF unused */ /* Length of string we read, excluding */
/* trailing '\0' implied by closing quote. */
/* register char * where; JF unused */
/* register fragS * fragP; JF unused */
register int c;
/*
* The following awkward logic is to parse ZERO or more strings,
* comma seperated. Recall a string expression includes spaces
* before the opening '\"' and spaces after the closing '\"'.
* We fake a leading ',' if there is (supposed to be)
* a 1st, expression. We keep demanding expressions for each
* ','.
*/
if (is_it_end_of_statement())
{
c = 0; /* Skip loop. */
++ input_line_pointer; /* Compensate for end of loop. */
}
else
{
c = ','; /* Do loop. */
}
for ( ; c == ','; c = *input_line_pointer ++)
{
SKIP_WHITESPACE();
if (* input_line_pointer == '\"')
{
++ input_line_pointer; /* -> 1st char of string. */
while ( (c = next_char_of_string()) >= 0)
{
FRAG_APPEND_1_CHAR( c );
}
if (append_zero)
{
FRAG_APPEND_1_CHAR( 0 );
}
know( input_line_pointer [-1] == '\"' );
}
else
{
as_warn( "Expected \"-ed string" );
}
SKIP_WHITESPACE();
}
-- input_line_pointer;
demand_empty_rest_of_line();
} /* stringer() */
\f
static int
next_char_of_string ()
{
register int c;
c = * input_line_pointer ++;
switch (c)
{
case '\"':
c = -1;
break;
case '\\':
switch (c = * input_line_pointer ++)
{
case 'b':
c = '\b';
break;
case 'f':
c = '\f';
break;
case 'n':
c = '\n';
break;
case 'r':
c = '\r';
break;
case 't':
c = '\t';
break;
case '\\':
case '"':
break; /* As itself. */
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
{
long int number;
for (number = 0; isdigit(c); c = * input_line_pointer ++)
{
number = number * 8 + c - '0';
}
c = number;
}
-- input_line_pointer;
break;
case '\n':
/* as_fatal( "Unterminated string - use app!" ); */
/* To be compatible with BSD 4.2 as: give the luser a linefeed!! */
c = '\n';
break;
default:
as_warn( "Bad escaped character in string, '?' assumed" );
c = '?';
break;
}
break;
default:
break;
}
return (c);
}
\f
static segT
get_segmented_expression ( expP )
register expressionS * expP;
{
register segT retval;
if ( (retval = expression( expP )) == SEG_PASS1 || retval == SEG_NONE || retval == SEG_BIG )
{
as_warn("Expected address expression: absolute 0 assumed");
retval = expP -> X_seg = SEG_ABSOLUTE;
expP -> X_add_number = 0;
expP -> X_add_symbol = expP -> X_subtract_symbol = 0;
}
return (retval); /* SEG_ ABSOLUTE,UNKNOWN,DATA,TEXT,BSS */
}
static segT
get_known_segmented_expression ( expP )
register expressionS * expP;
{
register segT retval;
register char * name1;
register char * name2;
if ( (retval = get_segmented_expression (expP)) == SEG_UNKNOWN
)
{
name1 = expP -> X_add_symbol ? expP -> X_add_symbol -> sy_name : "";
name2 = expP -> X_subtract_symbol ? expP -> X_subtract_symbol -> sy_name : "";
if ( name1 && name2 )
{
as_warn("Symbols \"%s\" \"%s\" are undefined: absolute 0 assumed.",
name1, name2);
}
else
{
as_warn("Symbol \"%s\" undefined: absolute 0 assumed.",
name1 ? name1 : name2);
}
retval = expP -> X_seg = SEG_ABSOLUTE;
expP -> X_add_number = 0;
expP -> X_add_symbol = expP -> X_subtract_symbol = NULL;
}
know( retval == SEG_ABSOLUTE || retval == SEG_DATA || retval == SEG_TEXT || retval == SEG_BSS || retval == SEG_DIFFERENCE );
return (retval);
} /* get_known_segmented_expression() */
/* static */ long int /* JF was static, but can't be if the MD pseudos are to use it */
get_absolute_expression ()
{
expressionS exp;
register segT s;
if ( (s = expression(& exp)) != SEG_ABSOLUTE )
{
if ( s != SEG_NONE )
{
as_warn( "Bad Absolute Expression, absolute 0 assumed.");
}
exp . X_add_number = 0;
}
return (exp . X_add_number);
}
static char /* return terminator */
get_absolute_expression_and_terminator( val_pointer)
long int * val_pointer; /* return value of expression */
{
* val_pointer = get_absolute_expression ();
return ( * input_line_pointer ++ );
}
\f
/*
* demand_copy_C_string()
*
* Like demand_copy_string, but return NULL if the string contains any '\0's.
* Give a warning if that happens.
*/
static char *
demand_copy_C_string (len_pointer)
int * len_pointer;
{
register char * s;
if (s = demand_copy_string (len_pointer))
{
register int len;
for (len = * len_pointer;
len > 0;
len--)
{
if (* s == 0)
{
s = 0;
len = 1;
* len_pointer = 0;
as_warn( "This string may not contain \'\\0\'" );
}
}
}
return (s);
}
\f
/*
* demand_copy_string()
*
* Demand string, but return a safe (=private) copy of the string.
* Return NULL if we can't read a string here.
*/
static char *
demand_copy_string (lenP)
int * lenP;
{
register int c;
register int len;
char * retval;
len = 0;
SKIP_WHITESPACE();
if (* input_line_pointer == '\"')
{
input_line_pointer ++; /* Skip opening quote. */
while ( (c = next_char_of_string()) >= 0 ) {
obstack_1grow ( &notes, c );
len ++;
}
/* JF this next line is so demand_copy_C_string will return a null
termanated string. */
obstack_1grow(&notes,'\0');
retval=obstack_finish( &notes);
} else {
as_warn( "Missing string" );
retval = NULL;
ignore_rest_of_line ();
}
* lenP = len;
return (retval);
}
\f
/*
* is_it_end_of_statement()
*
* In: Input_line_pointer -> next character.
*
* Do: Skip input_line_pointer over all whitespace.
*
* Out: TRUE if input_line_pointer -> end-of-line.
*/
static int
is_it_end_of_statement()
{
SKIP_WHITESPACE();
return (is_end_of_line [* input_line_pointer]);
}
void
equals(sym_name)
char *sym_name;
{
register struct symbol * symbolP; /* symbol we are working with */
input_line_pointer++;
if(*input_line_pointer=='=')
input_line_pointer++;
while(*input_line_pointer==' ' || *input_line_pointer=='\t')
input_line_pointer++;
if(sym_name[0]=='.' && sym_name[1]=='\0') {
/* Turn '. = mumble' into a .org mumble */
register segT segment;
expressionS exp;
register char *p;
segment = get_known_segmented_expression(& exp);
if ( ! need_pass_2 ) {
if (segment != now_seg && segment != SEG_ABSOLUTE)
as_warn("Illegal segment \"%s\". Segment \"%s\" assumed.",
seg_name [(int) segment], seg_name [(int) now_seg]);
p = frag_var (rs_org, 1, 1, (relax_substateT)0, exp.X_add_symbol,
exp.X_add_number, (char *)0);
* p = 0;
} /* if (ok to make frag) */
} else {
symbolP=symbol_find_or_make(sym_name);
pseudo_set(symbolP);
}
}
/* end: read.c */
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.