3a69b3aca6
Cherrypick from master 1991-04-04 18:19:53 UTC K. Richard Pixley <rich@cygnus> 'Initial revision':
gas/COPYING
gas/ChangeLog
gas/Makefile.in
gas/README
gas/app.c
gas/as.c
gas/as.h
gas/atof-generic.c
gas/bignum-copy.c
gas/bignum.h
gas/cond.c
gas/config/atof-ieee.c
gas/config/atof-vax.c
gas/config/obj-aout.c
gas/config/obj-aout.h
gas/config/obj-bout.c
gas/config/obj-bout.h
gas/config/obj-coff.c
gas/config/obj-coff.h
gas/config/tc-a29k.c
gas/config/tc-a29k.h
gas/config/tc-generic.c
gas/config/tc-generic.h
gas/config/tc-i386.c
gas/config/tc-i386.h
gas/config/tc-i860.c
gas/config/tc-i860.h
gas/config/tc-i960.c
gas/config/tc-i960.h
gas/config/tc-m68851.h
gas/config/tc-m68k.c
gas/config/tc-m68k.h
gas/config/tc-ns32k.c
gas/config/tc-ns32k.h
gas/config/tc-sparc.c
gas/config/tc-sparc.h
gas/config/tc-vax.c
gas/config/tc-vax.h
gas/config/te-generic.h
gas/config/te-ic960.h
gas/config/te-sun3.h
gas/config/vax-inst.h
gas/configure
gas/configure.in
gas/debug.c
gas/expr.c
gas/expr.h
gas/flonum-copy.c
gas/flonum-mult.c
gas/flonum.h
gas/frags.c
gas/frags.h
gas/hash.c
gas/hash.h
gas/input-file.c
gas/input-file.h
gas/input-scrub.c
gas/messages.c
gas/obj.h
gas/output-file.c
gas/output-file.h
gas/read.c
gas/read.h
gas/struc-symbol.h
gas/subsegs.c
gas/subsegs.h
gas/symbols.c
gas/symbols.h
gas/tc.h
gas/write.c
gas/write.h
ld/ld.h
ld/ldexp.c
ld/ldfile.c
ld/ldfile.h
ld/ldlang.h
ld/ldlex.h
ld/ldmain.h
ld/ldmisc.h
ld/ldwrite.h
Cherrypick from master 1991-03-21 21:29:06 UTC David Henkel-Wallace <gumby@cygnus> 'Initial revision':
ld/ldexp.h
ld/ldgram.y
ld/ldlang.c
ld/ldlex.l
ld/ldmain.c
ld/ldmisc.c
ld/ldwrite.c
Cherrypick from master 1991-01-17 15:34:55 UTC Roland Pesch <pesch@cygnus> 'Initial revision':
gas/doc/as.texinfo
79 lines
2.6 KiB
C
79 lines
2.6 KiB
C
/* expr.h -> header file for expr.c
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Copyright (C) 1987 Free Software Foundation, Inc.
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This file is part of GAS, the GNU Assembler.
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GAS is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 1, or (at your option)
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any later version.
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GAS is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GAS; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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/*
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* Abbreviations (mnemonics).
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*
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* O operator
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* Q quantity, operand
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* X eXpression
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*/
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/*
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* By popular demand, we define a struct to represent an expression.
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* This will no doubt mutate as expressions become baroque.
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*
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* Currently, we support expressions like "foo-bar+42".
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* In other words we permit a (possibly undefined) minuend, a
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* (possibly undefined) subtrahend and an (absolute) augend.
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* RMS says this is so we can have 1-pass assembly for any compiler
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* emmissions, and a 'case' statement might emit 'undefined1 - undefined2'.
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*
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* To simplify table-driven dispatch, we also have a "segment" for the
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* entire expression. That way we don't require complex reasoning about
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* whether particular components are defined; and we can change component
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* semantics without re-working all the dispatch tables in the assembler.
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* In other words the "type" of an expression is its segment.
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*/
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typedef struct
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{
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symbolS *X_add_symbol; /* foo */
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symbolS *X_subtract_symbol; /* bar */
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long X_add_number; /* 42. Must be signed. */
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segT X_seg; /* What segment (expr type)? */
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}
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expressionS;
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/* result should be type (expressionS *). */
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#define expression(result) expr(0,result)
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/* If an expression is SEG_BIG, look here */
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/* for its value. These common data may */
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/* be clobbered whenever expr() is called. */
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extern FLONUM_TYPE generic_floating_point_number; /* Flonums returned here. */
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/* Enough to hold most precise flonum. */
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extern LITTLENUM_TYPE generic_bignum []; /* Bignums returned here. */
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#define SIZE_OF_LARGE_NUMBER (20) /* Number of littlenums in above. */
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typedef char operator_rankT;
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#ifdef __STDC__
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char get_symbol_end(void);
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segT expr(int rank, expressionS *resultP);
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#else /* __STDC__ */
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char get_symbol_end();
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segT expr();
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#endif /* __STDC__ */
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/* end: expr.h */
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