* expr.h (expr_build_uconstant): Add prototype.
(expr_build_unary,expr_build_binary): Add prototypes. * expr.c (expr_build_uconstant): New function. (expr_build_unary,expr_build_binary): New functions.
This commit is contained in:
Doug Evans
parent
8d0bd9889c
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@ -1,3 +1,10 @@
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Wed Mar 25 13:44:18 1998 Doug Evans <devans@canuck.cygnus.com>
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* expr.h (expr_build_uconstant): Add prototype.
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(expr_build_unary,expr_build_binary): Add prototypes.
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* expr.c (expr_build_uconstant): New function.
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(expr_build_unary,expr_build_binary): New functions.
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Wed Mar 25 13:10:42 1998 Bruno Haible <bruno@linuix.mathematik.uni-karlsruhe.de>
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* gasp.c (IS*): Cast argument to unsigned char, not unsigned int.
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179
gas/expr.c
179
gas/expr.c
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@ -1,5 +1,5 @@
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/* expr.c -operands, expressions-
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Copyright (C) 1987, 90, 91, 92, 93, 94, 95, 96, 1997
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Copyright (C) 1987, 90, 91, 92, 93, 94, 95, 96, 1997, 1998
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Free Software Foundation, Inc.
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This file is part of GAS, the GNU Assembler.
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@ -28,6 +28,7 @@
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#include <ctype.h>
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#include <string.h>
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#define min(a, b) ((a) < (b) ? (a) : (b))
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#include "as.h"
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#include "obstack.h"
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@ -121,6 +122,62 @@ expr_symbol_where (sym, pfile, pline)
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return 0;
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}
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/* Utilities for building expressions.
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Since complex expressions are recorded as symbols for use in other
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expressions these return a symbolS * and not an expressionS *.
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These explicitly do not take an "add_number" argument. */
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/* ??? For completeness' sake one might want expr_build_symbol.
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It would just return its argument. */
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/* Build an expression for an unsigned constant.
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The corresponding one for signed constants is missing because
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there's currently no need for it. One could add an unsigned_p flag
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but that seems more clumsy. */
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symbolS *
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expr_build_uconstant (value)
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offsetT value;
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{
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expressionS e;
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e.X_op = O_constant;
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e.X_add_number = value;
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e.X_unsigned = 1;
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return make_expr_symbol (&e);
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}
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/* Build an expression for OP s1. */
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symbolS *
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expr_build_unary (op, s1)
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operatorT op;
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symbolS *s1;
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{
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expressionS e;
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e.X_op = op;
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e.X_add_symbol = s1;
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e.X_add_number = 0;
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return make_expr_symbol (&e);
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}
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/* Build an expression for s1 OP s2. */
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symbolS *
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expr_build_binary (op, s1, s2)
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operatorT op;
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symbolS *s1;
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symbolS *s2;
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{
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expressionS e;
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e.X_op = op;
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e.X_add_symbol = s1;
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e.X_op_symbol = s2;
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e.X_add_number = 0;
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return make_expr_symbol (&e);
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}
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/*
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* Build any floating-point literal here.
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* Also build any bignum literal here.
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@ -171,6 +228,32 @@ floating_constant (expressionP)
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expressionP->X_add_number = -1;
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}
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static valueT
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generic_bignum_to_int32 ()
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{
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valueT number =
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((generic_bignum[1] & LITTLENUM_MASK) << LITTLENUM_NUMBER_OF_BITS)
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| (generic_bignum[0] & LITTLENUM_MASK);
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number &= 0xffffffff;
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return number;
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}
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#ifdef BFD64
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static valueT
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generic_bignum_to_int64 ()
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{
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valueT number =
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((((((((valueT) generic_bignum[3] & LITTLENUM_MASK)
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<< LITTLENUM_NUMBER_OF_BITS)
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| ((valueT) generic_bignum[2] & LITTLENUM_MASK))
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<< LITTLENUM_NUMBER_OF_BITS)
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| ((valueT) generic_bignum[1] & LITTLENUM_MASK))
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<< LITTLENUM_NUMBER_OF_BITS)
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| ((valueT) generic_bignum[0] & LITTLENUM_MASK));
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return number;
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}
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#endif
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static void
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integer_constant (radix, expressionP)
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int radix;
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@ -286,7 +369,83 @@ integer_constant (radix, expressionP)
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/* c contains character after number. */
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/* input_line_pointer->char after c. */
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small = (input_line_pointer - start - 1) < too_many_digits;
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if (!small)
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if (radix == 16 && c == '_')
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{
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/* This is literal of the form 0x333_0_12345678_1.
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This example is equivalent to 0x00000333000000001234567800000001. */
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int num_little_digits = 0;
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int i;
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input_line_pointer = start; /*->1st digit. */
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know (LITTLENUM_NUMBER_OF_BITS == 16);
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for (c = '_'; c == '_'; num_little_digits+=2)
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{
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/* Convert one 64-bit word. */
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int ndigit = 0;
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number = 0;
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for (c = *input_line_pointer++;
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(digit = hex_value (c)) < maxdig;
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c = *(input_line_pointer++))
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{
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number = number * radix + digit;
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ndigit++;
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}
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/* Check for 8 digit per word max. */
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if (ndigit > 8)
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as_bad ("An bignum with underscores may not have more than 8 hex digits in any word.");
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/* Add this chunk to the bignum. Shift things down 2 little digits.*/
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know (LITTLENUM_NUMBER_OF_BITS == 16);
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for (i = min (num_little_digits + 1, SIZE_OF_LARGE_NUMBER - 1); i >= 2; i--)
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generic_bignum[i] = generic_bignum[i-2];
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/* Add the new digits as the least significant new ones. */
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generic_bignum[0] = number & 0xffffffff;
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generic_bignum[1] = number >> 16;
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}
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/* Again, c is char after number, input_line_pointer->after c. */
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if (num_little_digits > SIZE_OF_LARGE_NUMBER - 1)
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num_little_digits = SIZE_OF_LARGE_NUMBER - 1;
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assert (num_little_digits >= 4);
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if (num_little_digits != 8)
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as_bad ("A bignum with underscores must have exactly 4 words.");
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/* We might have some leading zeros. These can be trimmed to give
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* us a change to fit this constant into a small number.
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*/
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while (generic_bignum[num_little_digits-1] == 0 && num_little_digits > 1)
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num_little_digits--;
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if (num_little_digits <= 2)
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{
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/* will fit into 32 bits. */
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number = generic_bignum_to_int32 ();
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small = 1;
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}
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#ifdef BFD64
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else if (num_little_digits <= 4)
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{
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/* Will fit into 64 bits. */
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number = generic_bignum_to_int64 ();
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small = 1;
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}
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#endif
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else
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{
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small = 0;
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number = num_little_digits; /* number of littlenums in the bignum. */
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}
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}
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else if (!small)
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{
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/*
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* we saw a lot of digits. manufacture a bignum the hard way.
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if (leader < generic_bignum + 2)
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{
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/* will fit into 32 bits. */
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number =
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((generic_bignum[1] & LITTLENUM_MASK) << LITTLENUM_NUMBER_OF_BITS)
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| (generic_bignum[0] & LITTLENUM_MASK);
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number &= 0xffffffff
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number = generic_bignum_to_int32 ();
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small = 1;
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}
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#ifdef BFD64
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else if (leader < generic_bignum + 4)
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{
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/* Will fit into 64 bits. */
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number =
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((((((((valueT) generic_bignum[3] & LITTLENUM_MASK)
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<< LITTLENUM_NUMBER_OF_BITS)
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| ((valueT) generic_bignum[2] & LITTLENUM_MASK))
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<< LITTLENUM_NUMBER_OF_BITS)
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| ((valueT) generic_bignum[1] & LITTLENUM_MASK))
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<< LITTLENUM_NUMBER_OF_BITS)
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| ((valueT) generic_bignum[0] & LITTLENUM_MASK));
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number = generic_bignum_to_int64 ();
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small = 1;
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}
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#endif
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@ -1395,7 +1544,7 @@ operator ()
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}
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/*NOTREACHED*/
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}
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}
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/* Parse an expression. */
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