initial import of NetBSD tree

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diff --git a/gnu/usr.bin/gas/expr.h b/gnu/usr.bin/gas/expr.h
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+/* expr.h -> header file for expr.c
+   Copyright (C) 1987, 1992 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 2, 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.  */
+/*
+ * $Id: expr.h,v 1.1 1995/10/18 08:38:57 deraadt Exp $
+ */
+
+
+/*
+ * Abbreviations (mnemonics).
+ *
+ *	O	operator
+ *	Q	quantity,  operand
+ *	X	eXpression
+ */
+
+/*
+ * By popular demand, we define a struct to represent an expression.
+ * This will no doubt mutate as expressions become baroque.
+ *
+ * Currently, we support expressions like "foo-bar+42".
+ * In other words we permit a (possibly undefined) minuend, a
+ * (possibly undefined) subtrahend and an (absolute) augend.
+ * RMS says this is so we can have 1-pass assembly for any compiler
+ * emmissions, and a 'case' statement might emit 'undefined1 - undefined2'.
+ *
+ * To simplify table-driven dispatch, we also have a "segment" for the
+ * entire expression. That way we don't require complex reasoning about
+ * whether particular components are defined; and we can change component
+ * semantics without re-working all the dispatch tables in the assembler.
+ * In other words the "type" of an expression is its segment.
+ */
+
+typedef struct {
+	symbolS *X_add_symbol;		/* foo */
+	symbolS *X_subtract_symbol;	/* bar */
+	symbolS *X_got_symbol;		/* got */
+	long X_add_number;		/* 42.    Must be signed. */
+	segT	X_seg;			/* What segment (expr type)? */
+}
+expressionS;
+
+/* result should be type (expressionS *). */
+#define expression(result) expr(0,result)
+
+/* If an expression is SEG_BIG, look here */
+/* for its value. These common data may */
+/* be clobbered whenever expr() is called. */
+extern FLONUM_TYPE generic_floating_point_number; /* Flonums returned here. */
+/* Enough to hold most precise flonum. */
+extern LITTLENUM_TYPE generic_bignum[]; /* Bignums returned here. */
+#define SIZE_OF_LARGE_NUMBER (20)	/* Number of littlenums in above. */
+
+typedef char operator_rankT;
+
+#if __STDC__ == 1
+
+char get_symbol_end(void);
+segT expr(int rank, expressionS *resultP);
+unsigned int get_single_number(void);
+
+#else /* not __STDC__ */
+
+char get_symbol_end();
+segT expr();
+unsigned int get_single_number();
+
+#endif /* not __STDC__ */
+
+/* end of expr.h */