4.4BSD/usr/src/contrib/gas-1.38/as.h
/* as.h - global header file
Copyright (C) 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. */
#ifndef asH
#define asH /* Don't declare things twice. */
#if !defined(__STDC__) && !defined(const)
#define const /* ignore */
#endif
#ifdef USG
#define index strchr
#define bzero(s,n) memset((s),0,(n))
#define bcopy(from,to,n) memcpy((to),(from),(n))
#define setbuffer(a,b,c)
#endif
/*
* CAPITALISED names are #defined.
* "lowercaseH" is #defined if "lowercase.h" has been #include-d.
* "lowercaseT" is a typedef of "lowercase" objects.
* "lowercaseP" is type "pointer to object of type 'lowercase'".
* "lowercaseS" is typedef struct ... lowercaseS.
*
* #define SUSPECT when debugging.
* #define DUMP to include data-structure dumpers.
* #define COMMON as "extern" for all modules except one, where you #define
* COMMON as "".
* If TEST is #defined, then we are testing a module: #define COMMON as "".
*/
/* These #defines are for parameters of entire assembler. */
/* #define SUSPECT JF remove for speed testing */
/* #define DUMP */
#define NDEBUG /* JF disable asserts */
/* These #includes are for type definitions etc. */
/* #include "style.h" */
#include <stdio.h>
#include <assert.h>
#define obstack_chunk_alloc xmalloc
#define obstack_chunk_free xfree
/* These defines are potentially useful */
#define FALSE (0)
#define TRUE (!FALSE)
#define ASSERT assert
#define BAD_CASE(value) \
{ \
as_fatal ("Case value %d unexpected at line %d of file \"%s\"\n", \
value, __LINE__, __FILE__); \
}
/* These are assembler-wide concepts */
#ifndef COMMON
#ifdef TEST
#define COMMON /* declare our COMMONs storage here. */
#else
#define COMMON extern /* our commons live elswhere */
#endif
#endif
/* COMMON now defined */
#ifdef SUSPECT
#define register /* no registers: helps debugging */
#define know(p) ASSERT(p) /* know() is less ugly than #ifdef SUSPECT/ */
/* assert()/#endif. */
#else
#define know(p) /* know() checks are no-op.ed */
#endif /* #ifdef SUSPECT */
char *xmalloc(); /* keep C compilers happy */
char *xrealloc(); /* " */
void free(); /* " */
#define xfree free
/* input_scrub.c */
/*
* Supplies sanitised buffers to read.c.
* Also understands printing line-number part of error messages.
*/
/* Line number things. */
int seen_at_least_1_file();
void bump_line_counters();
void new_logical_line();
void as_where();
void as_perror();
void as_howmuch();
/* Sanitising things. */
void input_scrub_begin();
void input_scrub_end();
char *input_scrub_new_file();
char *input_scrub_next_buffer();
/* subsegs.c Sub-segments. Also, segment(=expression type)s.*/
/*
* This table describes the use of segments as EXPRESSION types.
*
* X_seg X_add_symbol X_subtract_symbol X_add_number
* SEG_NONE no (legal) expression
* SEG_PASS1 no (defined) "
* SEG_BIG * > 32 bits const.
* SEG_ABSOLUTE 0
* SEG_DATA * 0
* SEG_TEXT * 0
* SEG_BSS * 0
* SEG_UNKNOWN * 0
* SEG_DIFFERENCE 0 * 0
*
* The blank fields MUST be 0, and are nugatory.
* The '0' fields MAY be 0. The '*' fields MAY NOT be 0.
*
* SEG_BIG: X_add_number is < 0 if the result is in
* generic_floating_point_number. The value is -'c' where c is the
* character that introduced the constant. e.g. "0f6.9" will have -'f'
* as a X_add_number value.
* X_add_number > 0 is a count of how many littlenums it took to
* represent a bignum.
* SEG_DIFFERENCE:
* If segments of both symbols are known, they are the same segment.
* X_add_symbol != X_sub_symbol (then we just cancel them, => SEG_ABSOLUTE).
*/
typedef enum
{
SEG_ABSOLUTE,
SEG_TEXT,
SEG_DATA,
SEG_BSS,
SEG_UNKNOWN,
SEG_NONE, /* Mythical Segment: NO expression seen. */
SEG_PASS1, /* Mythical Segment: Need another pass. */
SEG_GOOF, /* Only happens if AS has a logic error. */
/* Invented so we don't crash printing */
/* error message involving weird segment. */
SEG_BIG, /* Bigger than 32 bits constant. */
SEG_DIFFERENCE /* Mythical Segment: absolute difference. */
} segT;
#define SEG_MAXIMUM_ORDINAL (SEG_DIFFERENCE)
typedef unsigned char subsegT;
COMMON subsegT now_subseg;
/* What subseg we are accreting now? */
COMMON segT now_seg;
/* Segment our instructions emit to. */
/* Only OK values are SEG_TEXT or SEG_DATA. */
extern char *const seg_name[];
extern const int seg_N_TYPE[];
extern const segT N_TYPE_seg[];
void subsegs_begin();
void subseg_change();
void subseg_new();
/* relax() */
typedef enum
{
rs_fill, /* Variable chars to be repeated fr_offset */
/* times. Fr_symbol unused. */
/* Used with fr_offset == 0 for a constant */
/* length frag. */
rs_align, /* Align: Fr_offset: power of 2. */
/* 1 variable char: fill character. */
rs_org, /* Org: Fr_offset, fr_symbol: address. */
/* 1 variable char: fill character. */
rs_machine_dependent,
#ifndef WORKING_DOT_WORD
rs_broken_word, /* JF: gunpoint */
#endif
}
relax_stateT;
/* typedef unsigned char relax_substateT; */
/* JF this is more likely to leave the end of a struct frag on an align
boundry. Be very careful with this. */
typedef unsigned long int relax_substateT;
typedef unsigned long int relax_addressT;/* Enough bits for address. */
/* Still an integer type. */
/* frags.c */
/*
* A code fragment (frag) is some known number of chars, followed by some
* unknown number of chars. Typically the unknown number of chars is an
* instruction address whose size is yet unknown. We always know the greatest
* possible size the unknown number of chars may become, and reserve that
* much room at the end of the frag.
* Once created, frags do not change address during assembly.
* We chain the frags in (a) forward-linked list(s). The object-file address
* of the 1st char of a frag is generally not known until after relax().
* Many things at assembly time describe an address by {object-file-address
* of a particular frag}+offset.
BUG: it may be smarter to have a single pointer off to various different
notes for different frag kinds. See how code pans out.
*/
struct frag /* a code fragment */
{
long unsigned int fr_address; /* Object file address. */
struct frag *fr_next; /* Chain forward; ascending address order. */
/* Rooted in frch_root. */
long int fr_fix; /* (Fixed) number of chars we know we have. */
/* May be 0. */
long int fr_var; /* (Variable) number of chars after above. */
/* May be 0. */
struct symbol *fr_symbol; /* For variable-length tail. */
long int fr_offset; /* For variable-length tail. */
char *fr_opcode; /*->opcode low addr byte,for relax()ation*/
relax_stateT fr_type; /* What state is my tail in? */
relax_substateT fr_subtype;
/* These are needed only on the NS32K machines */
char fr_pcrel_adjust;
char fr_bsr;
char fr_literal [1]; /* Chars begin here. */
/* One day we will compile fr_literal[0]. */
};
#define SIZEOF_STRUCT_FRAG \
((int)zero_address_frag.fr_literal-(int)&zero_address_frag)
/* We want to say fr_literal[0] above. */
typedef struct frag fragS;
COMMON fragS * frag_now; /* -> current frag we are building. */
/* This frag is incomplete. */
/* It is, however, included in frchain_now. */
/* Frag_now->fr_fix is bogus. Use: */
/* Virtual frag_now->fr_fix==obstack_next_free(&frags)-frag_now->fr_literal.*/
COMMON fragS zero_address_frag; /* For foreign-segment symbol fixups. */
COMMON fragS bss_address_frag; /* For local common (N_BSS segment) fixups. */
void frag_new();
char * frag_more();
char * frag_var();
void frag_wane();
void frag_align();
/* main program "as.c" (command arguments etc) */
COMMON char
flagseen[128]; /* ['x'] TRUE if "-x" seen. */
COMMON char *
out_file_name; /* name of emitted object file */
COMMON int need_pass_2; /* TRUE if we need a second pass. */
#endif /* #ifdef asH */
/* end: as.h */