/* expr.c -operands, expressions-
- Copyright (C) 1987, 90, 91, 92, 93, 94, 95, 96, 1997
+ Copyright (C) 1987, 90, 91, 92, 93, 94, 95, 96, 97, 1998
Free Software Foundation, Inc.
This file is part of GAS, the GNU Assembler.
#include <ctype.h>
#include <string.h>
+#define min(a, b) ((a) < (b) ? (a) : (b))
#include "as.h"
#include "obstack.h"
make_expr_symbol (expressionP)
expressionS *expressionP;
{
+ expressionS zero;
const char *fake;
symbolS *symbolP;
struct expr_symbol_line *n;
&& expressionP->X_add_number == 0)
return expressionP->X_add_symbol;
+ if (expressionP->X_op == O_big)
+ {
+ /* This won't work, because the actual value is stored in
+ generic_floating_point_number or generic_bignum, and we are
+ going to lose it if we haven't already. */
+ if (expressionP->X_add_number > 0)
+ as_bad (_("bignum invalid; zero assumed"));
+ else
+ as_bad (_("floating point number invalid; zero assumed"));
+ zero.X_op = O_constant;
+ zero.X_add_number = 0;
+ zero.X_unsigned = 0;
+ clean_up_expression (&zero);
+ expressionP = &zero;
+ }
+
fake = FAKE_LABEL_NAME;
/* Putting constant symbols in absolute_section rather than
return 0;
}
\f
+/* Utilities for building expressions.
+ Since complex expressions are recorded as symbols for use in other
+ expressions these return a symbolS * and not an expressionS *.
+ These explicitly do not take an "add_number" argument. */
+/* ??? For completeness' sake one might want expr_build_symbol.
+ It would just return its argument. */
+
+/* Build an expression for an unsigned constant.
+ The corresponding one for signed constants is missing because
+ there's currently no need for it. One could add an unsigned_p flag
+ but that seems more clumsy. */
+
+symbolS *
+expr_build_uconstant (value)
+ offsetT value;
+{
+ expressionS e;
+
+ e.X_op = O_constant;
+ e.X_add_number = value;
+ e.X_unsigned = 1;
+ return make_expr_symbol (&e);
+}
+
+/* Build an expression for OP s1. */
+
+symbolS *
+expr_build_unary (op, s1)
+ operatorT op;
+ symbolS *s1;
+{
+ expressionS e;
+
+ e.X_op = op;
+ e.X_add_symbol = s1;
+ e.X_add_number = 0;
+ return make_expr_symbol (&e);
+}
+
+/* Build an expression for s1 OP s2. */
+
+symbolS *
+expr_build_binary (op, s1, s2)
+ operatorT op;
+ symbolS *s1;
+ symbolS *s2;
+{
+ expressionS e;
+
+ e.X_op = op;
+ e.X_add_symbol = s1;
+ e.X_op_symbol = s2;
+ e.X_add_number = 0;
+ return make_expr_symbol (&e);
+}
+
+/* Build an expression for the current location ('.'). */
+
+symbolS *
+expr_build_dot ()
+{
+ expressionS e;
+
+ current_location (&e);
+ return make_expr_symbol (&e);
+}
+\f
/*
* Build any floating-point literal here.
* Also build any bignum literal here.
{
if (error_code == ERROR_EXPONENT_OVERFLOW)
{
- as_bad ("bad floating-point constant: exponent overflow, probably assembling junk");
+ as_bad (_("bad floating-point constant: exponent overflow, probably assembling junk"));
}
else
{
- as_bad ("bad floating-point constant: unknown error code=%d.", error_code);
+ as_bad (_("bad floating-point constant: unknown error code=%d."), error_code);
}
}
expressionP->X_op = O_big;
expressionP->X_add_number = -1;
}
+static valueT
+generic_bignum_to_int32 ()
+{
+ valueT number =
+ ((generic_bignum[1] & LITTLENUM_MASK) << LITTLENUM_NUMBER_OF_BITS)
+ | (generic_bignum[0] & LITTLENUM_MASK);
+ number &= 0xffffffff;
+ return number;
+}
+
+#ifdef BFD64
+static valueT
+generic_bignum_to_int64 ()
+{
+ valueT number =
+ ((((((((valueT) generic_bignum[3] & LITTLENUM_MASK)
+ << LITTLENUM_NUMBER_OF_BITS)
+ | ((valueT) generic_bignum[2] & LITTLENUM_MASK))
+ << LITTLENUM_NUMBER_OF_BITS)
+ | ((valueT) generic_bignum[1] & LITTLENUM_MASK))
+ << LITTLENUM_NUMBER_OF_BITS)
+ | ((valueT) generic_bignum[0] & LITTLENUM_MASK));
+ return number;
+}
+#endif
+
static void
integer_constant (radix, expressionP)
int radix;
/* In MRI mode, the number may have a suffix indicating the
radix. For that matter, it might actually be a floating
point constant. */
- for (suffix = input_line_pointer; isalnum (*suffix); suffix++)
+ for (suffix = input_line_pointer;
+ isalnum ((unsigned char) *suffix);
+ suffix++)
{
if (*suffix == 'e' || *suffix == 'E')
flt = 1;
else
{
c = *--suffix;
- if (islower (c))
+ if (islower ((unsigned char) c))
c = toupper (c);
if (c == 'B')
radix = 2;
/* c contains character after number. */
/* input_line_pointer->char after c. */
small = (input_line_pointer - start - 1) < too_many_digits;
- if (!small)
+
+ if (radix == 16 && c == '_')
+ {
+ /* This is literal of the form 0x333_0_12345678_1.
+ This example is equivalent to 0x00000333000000001234567800000001. */
+
+ int num_little_digits = 0;
+ int i;
+ input_line_pointer = start; /*->1st digit. */
+
+ know (LITTLENUM_NUMBER_OF_BITS == 16);
+
+ for (c = '_'; c == '_'; num_little_digits+=2)
+ {
+
+ /* Convert one 64-bit word. */
+ int ndigit = 0;
+ number = 0;
+ for (c = *input_line_pointer++;
+ (digit = hex_value (c)) < maxdig;
+ c = *(input_line_pointer++))
+ {
+ number = number * radix + digit;
+ ndigit++;
+ }
+
+ /* Check for 8 digit per word max. */
+ if (ndigit > 8)
+ as_bad (_("A bignum with underscores may not have more than 8 hex digits in any word."));
+
+ /* Add this chunk to the bignum. Shift things down 2 little digits.*/
+ know (LITTLENUM_NUMBER_OF_BITS == 16);
+ for (i = min (num_little_digits + 1, SIZE_OF_LARGE_NUMBER - 1); i >= 2; i--)
+ generic_bignum[i] = generic_bignum[i-2];
+
+ /* Add the new digits as the least significant new ones. */
+ generic_bignum[0] = number & 0xffffffff;
+ generic_bignum[1] = number >> 16;
+ }
+
+ /* Again, c is char after number, input_line_pointer->after c. */
+
+ if (num_little_digits > SIZE_OF_LARGE_NUMBER - 1)
+ num_little_digits = SIZE_OF_LARGE_NUMBER - 1;
+
+ assert (num_little_digits >= 4);
+
+ if (num_little_digits != 8)
+ as_bad (_("A bignum with underscores must have exactly 4 words."));
+
+ /* We might have some leading zeros. These can be trimmed to give
+ * us a change to fit this constant into a small number.
+ */
+ while (generic_bignum[num_little_digits-1] == 0 && num_little_digits > 1)
+ num_little_digits--;
+
+ if (num_little_digits <= 2)
+ {
+ /* will fit into 32 bits. */
+ number = generic_bignum_to_int32 ();
+ small = 1;
+ }
+#ifdef BFD64
+ else if (num_little_digits <= 4)
+ {
+ /* Will fit into 64 bits. */
+ number = generic_bignum_to_int64 ();
+ small = 1;
+ }
+#endif
+ else
+ {
+ small = 0;
+ number = num_little_digits; /* number of littlenums in the bignum. */
+ }
+ }
+ else if (!small)
{
/*
* we saw a lot of digits. manufacture a bignum the hard way.
if (leader < generic_bignum + 2)
{
/* will fit into 32 bits. */
- number =
- ((generic_bignum[1] & LITTLENUM_MASK) << LITTLENUM_NUMBER_OF_BITS)
- | (generic_bignum[0] & LITTLENUM_MASK);
- number &= 0xffffffff
+ number = generic_bignum_to_int32 ();
small = 1;
}
#ifdef BFD64
else if (leader < generic_bignum + 4)
{
/* Will fit into 64 bits. */
- number =
- ((((((((valueT) generic_bignum[3] & LITTLENUM_MASK)
- << LITTLENUM_NUMBER_OF_BITS)
- | ((valueT) generic_bignum[2] & LITTLENUM_MASK))
- << LITTLENUM_NUMBER_OF_BITS)
- | ((valueT) generic_bignum[1] & LITTLENUM_MASK))
- << LITTLENUM_NUMBER_OF_BITS)
- | ((valueT) generic_bignum[0] & LITTLENUM_MASK));
+ number = generic_bignum_to_int64 ();
small = 1;
}
#endif
/* either not seen or not defined. */
/* @@ Should print out the original string instead of
the parsed number. */
- as_bad ("backw. ref to unknown label \"%d:\", 0 assumed.",
+ as_bad (_("backw. ref to unknown label \"%d:\", 0 assumed."),
(int) number);
expressionP->X_op = O_constant;
}
if (i < 0)
{
- as_bad ("Character constant too large");
+ as_bad (_("Character constant too large"));
i = 0;
}
{
input_line_pointer++;
floating_constant (expressionP);
- expressionP->X_add_number = -(isupper (c) ? tolower (c) : c);
+ expressionP->X_add_number =
+ - (isupper ((unsigned char) c) ? tolower (c) : c);
}
else
{
{
case 0:
case ERROR_EXPONENT_OVERFLOW:
- if (*cp == 'f' || *cp == 'b')
+ if (cp == input_line_pointer + 1)
/* looks like a difference expression */
goto is_0f_label;
else
goto is_0f_float;
default:
- as_fatal ("expr.c(operand): bad atof_generic return val %d",
+ as_fatal (_("expr.c(operand): bad atof_generic return val %d"),
r);
}
}
case 'G':
input_line_pointer++;
floating_constant (expressionP);
- expressionP->X_add_number = -(isupper (c) ? tolower (c) : c);
+ expressionP->X_add_number =
+ - (isupper ((unsigned char) c) ? tolower (c) : c);
break;
case '$':
if ((c == '(' && *input_line_pointer++ != ')')
|| (c == '[' && *input_line_pointer++ != ']'))
{
- as_bad ("Missing ')' assumed");
+ as_bad (_("Missing ')' assumed"));
input_line_pointer--;
}
SKIP_WHITESPACE ();
case 'E':
if (! flag_m68k_mri || *input_line_pointer != '\'')
goto de_fault;
- as_bad ("EBCDIC constants are not supported");
+ as_bad (_("EBCDIC constants are not supported"));
/* Fall through. */
case 'A':
if (! flag_m68k_mri || *input_line_pointer != '\'')
expressionP->X_add_number = 0;
}
else
- as_warn ("Unary operator %c ignored because bad operand follows",
+ as_warn (_("Unary operator %c ignored because bad operand follows"),
c);
}
break;
input_line_pointer += start ? 8 : 7;
SKIP_WHITESPACE ();
if (*input_line_pointer != '(')
- as_bad ("syntax error in .startof. or .sizeof.");
+ as_bad (_("syntax error in .startof. or .sizeof."));
else
{
char *buf;
*input_line_pointer = c;
SKIP_WHITESPACE ();
if (*input_line_pointer != ')')
- as_bad ("syntax error in .startof. or .sizeof.");
+ as_bad (_("syntax error in .startof. or .sizeof."));
else
++input_line_pointer;
}
if (expressionP->X_op == O_absent)
{
++input_line_pointer;
- as_bad ("Bad expression");
+ as_bad (_("Bad expression"));
expressionP->X_op = O_constant;
expressionP->X_add_number = 0;
}
#undef __
#define __ O_illegal
-static operatorT op_encoding[256] =
+static const operatorT op_encoding[256] =
{ /* maps ASCII->operators */
__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,
1 /* O_logical_or */
};
-/* Initialize the expression parser. */
+/* Unfortunately, in MRI mode for the m68k, multiplication and
+ division have lower precedence than the bit wise operators. This
+ function sets the operator precedences correctly for the current
+ mode. Also, MRI uses a different bit_not operator, and this fixes
+ that as well. */
+
+#define STANDARD_MUL_PRECEDENCE (7)
+#define MRI_MUL_PRECEDENCE (5)
void
-expr_begin ()
+expr_set_precedence ()
{
- /* In MRI mode for the m68k, multiplication and division have lower
- precedence than the bit wise operators. */
if (flag_m68k_mri)
{
- op_rank[O_multiply] = 5;
- op_rank[O_divide] = 5;
- op_rank[O_modulus] = 5;
- op_encoding['"'] = O_bit_not;
+ op_rank[O_multiply] = MRI_MUL_PRECEDENCE;
+ op_rank[O_divide] = MRI_MUL_PRECEDENCE;
+ op_rank[O_modulus] = MRI_MUL_PRECEDENCE;
}
+ else
+ {
+ op_rank[O_multiply] = STANDARD_MUL_PRECEDENCE;
+ op_rank[O_divide] = STANDARD_MUL_PRECEDENCE;
+ op_rank[O_modulus] = STANDARD_MUL_PRECEDENCE;
+ }
+}
+
+/* Initialize the expression parser. */
+
+void
+expr_begin ()
+{
+ expr_set_precedence ();
/* Verify that X_op field is wide enough. */
{
}
/*NOTREACHED*/
-}
+}
/* Parse an expression. */
rightseg = expr (op_rank[(int) op_left], &right);
if (right.X_op == O_absent)
{
- as_warn ("missing operand; zero assumed");
+ as_warn (_("missing operand; zero assumed"));
right.X_op = O_constant;
right.X_add_number = 0;
right.X_add_symbol = NULL;
&& op_left != O_subtract
#endif
)
- as_bad ("operation combines symbols in different segments");
+ as_bad (_("operation combines symbols in different segments"));
op_right = operator ();
if (resultP->X_op == O_big)
{
- as_warn ("left operand is a %s; integer 0 assumed",
- resultP->X_add_number > 0 ? "bignum" : "float");
+ if (resultP->X_add_number > 0)
+ as_warn (_("left operand is a bignum; integer 0 assumed"));
+ else
+ as_warn (_("left operand is a float; integer 0 assumed"));
resultP->X_op = O_constant;
resultP->X_add_number = 0;
resultP->X_add_symbol = NULL;
}
if (right.X_op == O_big)
{
- as_warn ("right operand is a %s; integer 0 assumed",
- right.X_add_number > 0 ? "bignum" : "float");
+ if (right.X_add_number > 0)
+ as_warn (_("right operand is a bignum; integer 0 assumed"));
+ as_warn (_("right operand is a float; integer 0 assumed"));
right.X_op = O_constant;
right.X_add_number = 0;
right.X_add_symbol = NULL;
offsetT v = right.X_add_number;
if (v == 0 && (op_left == O_divide || op_left == O_modulus))
{
- as_warn ("division by zero");
+ as_warn (_("division by zero"));
v = 1;
}
switch (op_left)
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