/* expr.c -operands, expressions-
- Copyright (C) 1987, 1990, 1991, 1992, 1993 Free Software Foundation, Inc.
+ Copyright (C) 1987, 1990, 1991, 1992, 1993, 1994 Free Software Foundation, Inc.
This file is part of GAS, the GNU Assembler.
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. */
+ the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
/*
* This is really a branch office of as-read.c. I split it out to clearly
#include <string.h>
#include "as.h"
-
+#include "libiberty.h"
#include "obstack.h"
+static void floating_constant PARAMS ((expressionS * expressionP));
+static void integer_constant PARAMS ((int radix, expressionS * expressionP));
+static void mri_char_constant PARAMS ((expressionS *));
+static void current_location PARAMS ((expressionS *));
static void clean_up_expression PARAMS ((expressionS * expressionP));
+
extern const char EXP_CHARS[], FLT_CHARS[];
+\f
+/* Build a dummy symbol to hold a complex expression. This is how we
+ build expressions up out of other expressions. The symbol is put
+ into the fake section expr_section. */
+symbolS *
+make_expr_symbol (expressionP)
+ expressionS *expressionP;
+{
+ const char *fake;
+ symbolS *symbolP;
+
+ if (expressionP->X_op == O_symbol
+ && expressionP->X_add_number == 0)
+ return expressionP->X_add_symbol;
+
+ /* FIXME: This should be something which decode_local_label_name
+ will handle. */
+ fake = FAKE_LABEL_NAME;
+
+ /* Putting constant symbols in absolute_section rather than
+ expr_section is convenient for the old a.out code, for which
+ S_GET_SEGMENT does not always retrieve the value put in by
+ S_SET_SEGMENT. */
+ symbolP = symbol_create (fake,
+ (expressionP->X_op == O_constant
+ ? absolute_section
+ : expr_section),
+ 0, &zero_address_frag);
+ symbolP->sy_value = *expressionP;
+
+ if (expressionP->X_op == O_constant)
+ resolve_symbol_value (symbolP);
+
+ return symbolP;
+}
+\f
/*
* Build any floating-point literal here.
* Also build any bignum literal here.
FLONUM_TYPE generic_floating_point_number =
{
&generic_bignum[6], /* low (JF: Was 0) */
- &generic_bignum[SIZE_OF_LARGE_NUMBER + 6 - 1], /* high JF: (added +6) */
+ &generic_bignum[SIZE_OF_LARGE_NUMBER + 6 - 1], /* high JF: (added +6) */
0, /* leader */
0, /* exponent */
0 /* sign */
/* If nonzero, we've been asked to assemble nan, +inf or -inf */
int generic_floating_point_magic;
\f
-void
+static void
floating_constant (expressionP)
expressionS *expressionP;
{
/* floating-point constant. */
int error_code;
- error_code = atof_generic
- (&input_line_pointer, ".", EXP_CHARS,
- &generic_floating_point_number);
+ error_code = atof_generic (&input_line_pointer, ".", EXP_CHARS,
+ &generic_floating_point_number);
if (error_code)
{
as_bad ("bad floating-point constant: unknown error code=%d.", error_code);
}
}
- expressionP->X_seg = big_section;
+ expressionP->X_op = O_big;
/* input_line_pointer->just after constant, */
/* which may point to whitespace. */
expressionP->X_add_number = -1;
}
-
-void
+static void
integer_constant (radix, expressionP)
int radix;
expressionS *expressionP;
{
- char *digit_2; /*->2nd digit of number. */
+ char *start; /* start of number. */
+ char *suffix = NULL;
char c;
-
valueT number; /* offset or (absolute) value */
short int digit; /* value of next digit in current radix */
short int maxdig = 0;/* highest permitted digit value. */
symbolS *symbolP; /* points to symbol */
int small; /* true if fits in 32 bits. */
- extern const char hex_value[]; /* in hex_value.c */
/* May be bignum, or may fit in 32 bits. */
/* Most numbers fit into 32 bits, and we want this case to be fast.
number we are looking for is expected to be positive, but if it
fits into 32 bits as an unsigned number, we let it be a 32-bit
number. The cavalier approach is for speed in ordinary cases. */
+ /* This has been extended for 64 bits. We blindly assume that if
+ you're compiling in 64-bit mode, the target is a 64-bit machine.
+ This should be cleaned up. */
+
+#ifdef BFD64
+#define valuesize 64
+#else /* includes non-bfd case, mostly */
+#define valuesize 32
+#endif
- switch (radix)
+ if (flag_mri && radix == 0)
{
+ int flt = 0;
+
+ /* 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++)
+ {
+ if (*suffix == 'e' || *suffix == 'E')
+ flt = 1;
+ }
+
+ if (suffix == input_line_pointer)
+ {
+ radix = 10;
+ suffix = NULL;
+ }
+ else
+ {
+ c = *--suffix;
+ if (islower (c))
+ c = toupper (c);
+ if (c == 'B')
+ radix = 2;
+ else if (c == 'D')
+ radix = 10;
+ else if (c == 'O' || c == 'Q')
+ radix = 8;
+ else if (c == 'H')
+ radix = 16;
+ else if (suffix[1] == '.' || c == 'E' || flt)
+ {
+ floating_constant (expressionP);
+ return;
+ }
+ else
+ {
+ radix = 10;
+ suffix = NULL;
+ }
+ }
+ }
+ switch (radix)
+ {
case 2:
maxdig = 2;
- too_many_digits = 33;
+ too_many_digits = valuesize + 1;
break;
case 8:
maxdig = radix = 8;
- too_many_digits = 11;
+ too_many_digits = (valuesize + 2) / 3 + 1;
break;
case 16:
-
-
maxdig = radix = 16;
- too_many_digits = 9;
+ too_many_digits = (valuesize + 3) / 4 + 1;
break;
case 10:
maxdig = radix = 10;
- too_many_digits = 11;
+ too_many_digits = (valuesize + 12) / 4; /* very rough */
}
- c = *input_line_pointer;
- input_line_pointer++;
- digit_2 = input_line_pointer;
- for (number = 0; (digit = hex_value[c]) < maxdig; c = *input_line_pointer++)
+#undef valuesize
+ start = input_line_pointer;
+ c = *input_line_pointer++;
+ for (number = 0;
+ (digit = hex_value (c)) < maxdig;
+ c = *input_line_pointer++)
{
number = number * radix + digit;
}
/* c contains character after number. */
/* input_line_pointer->char after c. */
- small = input_line_pointer - digit_2 < too_many_digits;
+ small = (input_line_pointer - start - 1) < too_many_digits;
if (!small)
{
/*
leader = generic_bignum;
generic_bignum[0] = 0;
generic_bignum[1] = 0;
- /* we could just use digit_2, but lets be mnemonic. */
- input_line_pointer = --digit_2; /*->1st digit. */
+ input_line_pointer = start; /*->1st digit. */
c = *input_line_pointer++;
- for (; (carry = hex_value[c]) < maxdig; c = *input_line_pointer++)
+ for (;
+ (carry = hex_value (c)) < maxdig;
+ c = *input_line_pointer++)
{
for (pointer = generic_bignum;
pointer <= leader;
if (carry)
{
if (leader < generic_bignum + SIZE_OF_LARGE_NUMBER - 1)
- { /* room to grow a longer bignum. */
+ {
+ /* room to grow a longer bignum. */
*++leader = carry;
}
}
}
/* again, c is char after number, */
/* input_line_pointer->after c. */
- know (sizeof (int) * 8 == 32);
know (LITTLENUM_NUMBER_OF_BITS == 16);
- /* hence the constant "2" in the next line. */
if (leader < generic_bignum + 2)
- { /* will fit into 32 bits. */
+ {
+ /* will fit into 32 bits. */
number =
((generic_bignum[1] & LITTLENUM_MASK) << LITTLENUM_NUMBER_OF_BITS)
| (generic_bignum[0] & LITTLENUM_MASK);
number = leader - generic_bignum + 1; /* number of littlenums in the bignum. */
}
}
+
+ if (flag_mri && suffix != NULL && input_line_pointer - 1 == suffix)
+ c = *input_line_pointer++;
+
if (small)
{
/*
* than checking for strict canonical form. syntax sux!
*/
- switch (c)
+ if (LOCAL_LABELS_FB && c == 'b')
{
+ /*
+ * backward ref to local label.
+ * because it is backward, expect it to be defined.
+ */
+ /* Construct a local label. */
+ name = fb_label_name ((int) number, 0);
-#ifdef LOCAL_LABELS_FB
- case 'b':
- {
- /*
- * backward ref to local label.
- * because it is backward, expect it to be defined.
- */
- /* Construct a local label. */
- name = fb_label_name ((int) number, 0);
-
- /* seen before, or symbol is defined: ok */
- symbolP = symbol_find (name);
- if ((symbolP != NULL) && (S_IS_DEFINED (symbolP)))
- {
-
- /* local labels are never absolute. don't waste time
- checking absoluteness. */
- know (SEG_NORMAL (S_GET_SEGMENT (symbolP)));
-
- expressionP->X_add_symbol = symbolP;
- expressionP->X_seg = S_GET_SEGMENT (symbolP);
-
- }
- else
- {
- /* 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.",
- (int) number);
- expressionP->X_seg = absolute_section;
- }
+ /* seen before, or symbol is defined: ok */
+ symbolP = symbol_find (name);
+ if ((symbolP != NULL) && (S_IS_DEFINED (symbolP)))
+ {
+ /* local labels are never absolute. don't waste time
+ checking absoluteness. */
+ know (SEG_NORMAL (S_GET_SEGMENT (symbolP)));
- expressionP->X_add_number = 0;
- break;
- } /* case 'b' */
+ expressionP->X_op = O_symbol;
+ expressionP->X_add_symbol = symbolP;
+ }
+ else
+ {
+ /* 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.",
+ (int) number);
+ expressionP->X_op = O_constant;
+ }
- case 'f':
- {
- /*
- * forward reference. expect symbol to be undefined or
- * unknown. undefined: seen it before. unknown: never seen
- * it before.
- * construct a local label name, then an undefined symbol.
- * don't create a xseg frag for it: caller may do that.
- * just return it as never seen before.
- */
- name = fb_label_name ((int) number, 1);
- symbolP = symbol_find_or_make (name);
- /* we have no need to check symbol properties. */
+ expressionP->X_add_number = 0;
+ } /* case 'b' */
+ else if (LOCAL_LABELS_FB && c == 'f')
+ {
+ /*
+ * forward reference. expect symbol to be undefined or
+ * unknown. undefined: seen it before. unknown: never seen
+ * it before.
+ * construct a local label name, then an undefined symbol.
+ * don't create a xseg frag for it: caller may do that.
+ * just return it as never seen before.
+ */
+ name = fb_label_name ((int) number, 1);
+ symbolP = symbol_find_or_make (name);
+ /* we have no need to check symbol properties. */
#ifndef many_segments
- /* since "know" puts its arg into a "string", we
- can't have newlines in the argument. */
- know (S_GET_SEGMENT (symbolP) == undefined_section || S_GET_SEGMENT (symbolP) == text_section || S_GET_SEGMENT (symbolP) == data_section);
+ /* since "know" puts its arg into a "string", we
+ can't have newlines in the argument. */
+ know (S_GET_SEGMENT (symbolP) == undefined_section || S_GET_SEGMENT (symbolP) == text_section || S_GET_SEGMENT (symbolP) == data_section);
#endif
- expressionP->X_add_symbol = symbolP;
- expressionP->X_seg = undefined_section;
- expressionP->X_subtract_symbol = NULL;
- expressionP->X_add_number = 0;
+ expressionP->X_op = O_symbol;
+ expressionP->X_add_symbol = symbolP;
+ expressionP->X_add_number = 0;
+ } /* case 'f' */
+ else if (LOCAL_LABELS_DOLLAR && c == '$')
+ {
+ /* If the dollar label is *currently* defined, then this is just
+ another reference to it. If it is not *currently* defined,
+ then this is a fresh instantiation of that number, so create
+ it. */
- break;
- } /* case 'f' */
+ if (dollar_label_defined ((long) number))
+ {
+ name = dollar_label_name ((long) number, 0);
+ symbolP = symbol_find (name);
+ know (symbolP != NULL);
+ }
+ else
+ {
+ name = dollar_label_name ((long) number, 1);
+ symbolP = symbol_find_or_make (name);
+ }
-#endif /* LOCAL_LABELS_FB */
+ expressionP->X_op = O_symbol;
+ expressionP->X_add_symbol = symbolP;
+ expressionP->X_add_number = 0;
+ } /* case '$' */
+ else
+ {
+ expressionP->X_op = O_constant;
+#ifdef TARGET_WORD_SIZE
+ /* Sign extend NUMBER. */
+ number |= (-(number >> (TARGET_WORD_SIZE - 1))) << (TARGET_WORD_SIZE - 1);
+#endif
+ expressionP->X_add_number = number;
+ input_line_pointer--; /* restore following character. */
+ } /* really just a number */
+ }
+ else
+ {
+ /* not a small number */
+ expressionP->X_op = O_big;
+ expressionP->X_add_number = number; /* number of littlenums */
+ input_line_pointer--; /*->char following number. */
+ }
+}
-#ifdef LOCAL_LABELS_DOLLAR
+/* Parse an MRI multi character constant. */
- case '$':
- {
+static void
+mri_char_constant (expressionP)
+ expressionS *expressionP;
+{
+ int i;
- /* If the dollar label is *currently* defined, then this is just
- another reference to it. If it is not *currently* defined,
- then this is a fresh instantiation of that number, so create
- it. */
+ if (*input_line_pointer == '\''
+ && input_line_pointer[1] != '\'')
+ {
+ expressionP->X_op = O_constant;
+ expressionP->X_add_number = 0;
+ return;
+ }
- if (dollar_label_defined (number))
- {
- name = dollar_label_name (number, 0);
- symbolP = symbol_find (name);
- know (symbolP != NULL);
- }
- else
- {
- name = dollar_label_name (number, 1);
- symbolP = symbol_find_or_make (name);
- }
+ /* In order to get the correct byte ordering, we must build the
+ number in reverse. */
+ for (i = SIZE_OF_LARGE_NUMBER - 1; i >= 0; i--)
+ {
+ int j;
- expressionP->X_add_symbol = symbolP;
- expressionP->X_add_number = 0;
- expressionP->X_seg = S_GET_SEGMENT (symbolP);
+ generic_bignum[i] = 0;
+ for (j = 0; j < CHARS_PER_LITTLENUM; j++)
+ {
+ if (*input_line_pointer == '\'')
+ {
+ if (input_line_pointer[1] != '\'')
+ break;
+ ++input_line_pointer;
+ }
+ generic_bignum[i] <<= 8;
+ generic_bignum[i] += *input_line_pointer;
+ ++input_line_pointer;
+ }
- break;
- } /* case '$' */
+ if (i < SIZE_OF_LARGE_NUMBER - 1)
+ {
+ /* If there is more than one littlenum, left justify the
+ last one to make it match the earlier ones. If there is
+ only one, we can just use the value directly. */
+ for (; j < CHARS_PER_LITTLENUM; j++)
+ generic_bignum[i] <<= 8;
+ }
-#endif /* LOCAL_LABELS_DOLLAR */
+ if (*input_line_pointer == '\''
+ && input_line_pointer[1] != '\'')
+ break;
+ }
- default:
- {
- expressionP->X_add_number = number;
- expressionP->X_seg = absolute_section;
- input_line_pointer--; /* restore following character. */
- break;
- } /* really just a number */
+ if (i < 0)
+ {
+ as_bad ("Character constant too large");
+ i = 0;
+ }
- } /* switch on char following the number */
+ if (i > 0)
+ {
+ int c;
+ int j;
+ c = SIZE_OF_LARGE_NUMBER - i;
+ for (j = 0; j < c; j++)
+ generic_bignum[j] = generic_bignum[i + j];
+ i = c;
+ }
+ know (LITTLENUM_NUMBER_OF_BITS == 16);
+ if (i > 2)
+ {
+ expressionP->X_op = O_big;
+ expressionP->X_add_number = i;
}
else
{
- /* not a small number */
- expressionP->X_add_number = number;
- expressionP->X_seg = big_section;
- input_line_pointer--; /*->char following number. */
+ expressionP->X_op = O_constant;
+ if (i < 2)
+ expressionP->X_add_number = generic_bignum[0] & LITTLENUM_MASK;
+ else
+ expressionP->X_add_number =
+ (((generic_bignum[1] & LITTLENUM_MASK)
+ << LITTLENUM_NUMBER_OF_BITS)
+ | (generic_bignum[0] & LITTLENUM_MASK));
}
-} /* integer_constant() */
+ /* Skip the final closing quote. */
+ ++input_line_pointer;
+}
+
+/* Return an expression representing the current location. This
+ handles the magic symbol `.'. */
+
+static void
+current_location (expressionp)
+ expressionS *expressionp;
+{
+ if (now_seg == absolute_section)
+ {
+ expressionp->X_op = O_constant;
+ expressionp->X_add_number = abs_section_offset;
+ }
+ else
+ {
+ symbolS *symbolp;
+
+ symbolp = symbol_new (FAKE_LABEL_NAME, now_seg,
+ (valueT) frag_now_fix (),
+ frag_now);
+ expressionp->X_op = O_symbol;
+ expressionp->X_add_symbol = symbolp;
+ expressionp->X_add_number = 0;
+ }
+}
/*
* Summary of operand().
* in: Input_line_pointer points to 1st char of operand, which may
* be a space.
*
- * out: A expressionS. X_seg determines how to understand the rest of the
- * expressionS.
- * The operand may have been empty: in this case X_seg == SEG_ABSENT.
+ * out: A expressionS.
+ * The operand may have been empty: in this case X_op == O_absent.
* Input_line_pointer->(next non-blank) char after operand.
- *
*/
-\f
-
static segT
operand (expressionP)
char c;
symbolS *symbolP; /* points to symbol */
char *name; /* points to name of symbol */
+ segT segment;
+
+ /* All integers are regarded as unsigned unless they are negated.
+ This is because the only thing which cares whether a number is
+ unsigned is the code in emit_expr which extends constants into
+ bignums. It should only sign extend negative numbers, so that
+ something like ``.quad 0x80000000'' is not sign extended even
+ though it appears negative if valueT is 32 bits. */
+ expressionP->X_unsigned = 1;
/* digits, assume it is a bignum. */
switch (c)
{
-#ifdef MRI
- case '%':
- integer_constant (2, expressionP);
- break;
- case '@':
- integer_constant (8, expressionP);
- break;
- case '$':
- integer_constant (16, expressionP);
- break;
-#endif
case '1':
case '2':
case '3':
case '9':
input_line_pointer--;
- integer_constant (10, expressionP);
+ integer_constant (flag_mri ? 0 : 10, expressionP);
break;
case '0':
/* non-decimal radix */
+ if (flag_mri)
+ {
+ char *s;
+
+ /* Check for a hex constant. */
+ for (s = input_line_pointer; hex_p (*s); s++)
+ ;
+ if (*s == 'h' || *s == 'H')
+ {
+ --input_line_pointer;
+ integer_constant (0, expressionP);
+ break;
+ }
+ }
c = *input_line_pointer;
switch (c)
{
-
+ case '8':
+ case '9':
+ if (flag_mri)
+ {
+ integer_constant (0, expressionP);
+ break;
+ }
+ /* Fall through. */
default:
+ default_case:
if (c && strchr (FLT_CHARS, c))
{
input_line_pointer++;
floating_constant (expressionP);
+ expressionP->X_add_number = -(isupper (c) ? tolower (c) : c);
}
else
{
/* The string was only zero */
- expressionP->X_add_symbol = 0;
+ expressionP->X_op = O_constant;
expressionP->X_add_number = 0;
- expressionP->X_seg = absolute_section;
}
break;
case 'x':
case 'X':
+ if (flag_mri)
+ goto default_case;
input_line_pointer++;
integer_constant (16, expressionP);
break;
case 'b':
-#ifdef LOCAL_LABELS_FB
- if (!*input_line_pointer
- || (!strchr ("+-.0123456789", *input_line_pointer)
- && !strchr (EXP_CHARS, *input_line_pointer)))
+ if (LOCAL_LABELS_FB)
{
+ switch (input_line_pointer[1])
+ {
+ case '+':
+ case '-':
+ /* If unambiguously a difference expression, treat
+ it as one by indicating a label; otherwise, it's
+ always a binary number. */
+ {
+ char *cp = input_line_pointer + 1;
+ while (strchr ("0123456789", *++cp))
+ ;
+ if (*cp == 'b' || *cp == 'f')
+ goto is_0b_label;
+ }
+ goto is_0b_binary;
+ case '0': case '1':
+ /* Some of our code elsewhere does permit digits
+ greater than the expected base; for consistency,
+ do the same here. */
+ case '2': case '3': case '4': case '5':
+ case '6': case '7': case '8': case '9':
+ goto is_0b_binary;
+ case 0:
+ goto is_0b_label;
+ default:
+ goto is_0b_label;
+ }
+ is_0b_label:
input_line_pointer--;
integer_constant (10, expressionP);
break;
+ is_0b_binary:
+ ;
}
-#endif
case 'B':
input_line_pointer++;
+ if (flag_mri)
+ goto default_case;
integer_constant (2, expressionP);
break;
case '5':
case '6':
case '7':
- integer_constant (8, expressionP);
+ integer_constant (flag_mri ? 0 : 8, expressionP);
break;
case 'f':
-#ifdef LOCAL_LABELS_FB
- /* if it says '0f' and the line ends or it doesn't look like
- a floating point #, its a local label ref. dtrt */
- /* likewise for the b's. xoxorich. */
- if (c == 'f'
- && (!*input_line_pointer ||
- (!strchr ("+-.0123456789", *input_line_pointer) &&
- !strchr (EXP_CHARS, *input_line_pointer))))
+ if (LOCAL_LABELS_FB)
{
- input_line_pointer -= 1;
+ /* If it says "0f" and it could possibly be a floating point
+ number, make it one. Otherwise, make it a local label,
+ and try to deal with parsing the rest later. */
+ if (!input_line_pointer[1]
+ || (is_end_of_line[0xff & input_line_pointer[1]]))
+ goto is_0f_label;
+ {
+ char *cp = input_line_pointer + 1;
+ int r = atof_generic (&cp, ".", EXP_CHARS,
+ &generic_floating_point_number);
+ switch (r)
+ {
+ case 0:
+ case ERROR_EXPONENT_OVERFLOW:
+ if (*cp == 'f' || *cp == 'b')
+ /* 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",
+ r);
+ }
+ }
+
+ /* Okay, now we've sorted it out. We resume at one of these
+ two labels, depending on what we've decided we're probably
+ looking at. */
+ is_0f_label:
+ input_line_pointer--;
integer_constant (10, expressionP);
break;
+
+ is_0f_float:
+ /* fall through */
+ ;
}
-#endif
case 'd':
case 'D':
case 'E':
case 'g':
case 'G':
-
input_line_pointer++;
floating_constant (expressionP);
expressionP->X_add_number = -(isupper (c) ? tolower (c) : c);
break;
-#ifdef LOCAL_LABELS_DOLLAR
case '$':
- integer_constant (10, expressionP);
- break;
-#endif
+ if (LOCAL_LABELS_DOLLAR)
+ {
+ integer_constant (10, expressionP);
+ break;
+ }
+ else
+ goto default_case;
}
break;
+
case '(':
+ case '[':
/* didn't begin with digit & not a name */
- {
- (void) expression (expressionP);
- /* Expression() will pass trailing whitespace */
- if (*input_line_pointer++ != ')')
- {
- as_bad ("Missing ')' assumed");
- input_line_pointer--;
- }
- /* here with input_line_pointer->char after "(...)" */
- }
- return expressionP->X_seg;
-
-
+ segment = expression (expressionP);
+ /* Expression() will pass trailing whitespace */
+ if ((c == '(' && *input_line_pointer++ != ')')
+ || (c == '[' && *input_line_pointer++ != ']'))
+ {
+ as_bad ("Missing ')' assumed");
+ input_line_pointer--;
+ }
+ /* here with input_line_pointer->char after "(...)" */
+ return segment;
+
+ case 'E':
+ if (! flag_mri || *input_line_pointer != '\'')
+ goto de_fault;
+ as_bad ("EBCDIC constants are not supported");
+ /* Fall through. */
+ case 'A':
+ if (! flag_mri || *input_line_pointer != '\'')
+ goto de_fault;
+ ++input_line_pointer;
+ /* Fall through. */
case '\'':
- /* Warning: to conform to other people's assemblers NO ESCAPEMENT is
- permitted for a single quote. The next character, parity errors and
- all, is taken as the value of the operand. VERY KINKY. */
- expressionP->X_add_number = *input_line_pointer++;
- expressionP->X_seg = absolute_section;
+ if (! flag_mri)
+ {
+ /* Warning: to conform to other people's assemblers NO
+ ESCAPEMENT is permitted for a single quote. The next
+ character, parity errors and all, is taken as the value
+ of the operand. VERY KINKY. */
+ expressionP->X_op = O_constant;
+ expressionP->X_add_number = *input_line_pointer++;
+ break;
+ }
+
+ mri_char_constant (expressionP);
break;
case '+':
- operand (expressionP);
+ (void) operand (expressionP);
break;
+ case '"':
+ /* Double quote is the logical not operator in MRI mode. */
+ if (! flag_mri)
+ goto de_fault;
+ /* Fall through. */
case '~':
case '-':
{
- /* unary operator: hope for SEG_ABSOLUTE */
- segT opseg = operand (expressionP);
- if (opseg == absolute_section)
+ operand (expressionP);
+ if (expressionP->X_op == O_constant)
{
/* input_line_pointer -> char after operand */
if (c == '-')
{
- expressionP->X_add_number = -expressionP->X_add_number;
+ expressionP->X_add_number = - expressionP->X_add_number;
/* Notice: '-' may overflow: no warning is given. This is
compatible with other people's assemblers. Sigh. */
+ expressionP->X_unsigned = 0;
}
else
- {
- expressionP->X_add_number = ~expressionP->X_add_number;
- }
+ expressionP->X_add_number = ~ expressionP->X_add_number;
}
- else if (opseg == text_section
- || opseg == data_section
- || opseg == bss_section
- || opseg == pass1_section
- || opseg == undefined_section)
+ else if (expressionP->X_op != O_illegal
+ && expressionP->X_op != O_absent)
{
+ expressionP->X_add_symbol = make_expr_symbol (expressionP);
if (c == '-')
- {
- expressionP->X_subtract_symbol = expressionP->X_add_symbol;
- expressionP->X_add_symbol = 0;
- expressionP->X_seg = diff_section;
- }
+ expressionP->X_op = O_uminus;
else
- as_warn ("Unary operator %c ignored because bad operand follows",
- c);
+ expressionP->X_op = O_bit_not;
+ expressionP->X_add_number = 0;
}
else
- as_warn ("Unary operator %c ignored because bad operand follows", c);
+ as_warn ("Unary operator %c ignored because bad operand follows",
+ c);
}
break;
+ case '$':
+ /* $ is the program counter when in MRI mode, or when DOLLAR_DOT
+ is defined. */
+#ifndef DOLLAR_DOT
+ if (! flag_mri)
+ goto de_fault;
+#endif
+ if (flag_mri && hex_p (*input_line_pointer))
+ {
+ /* In MRI mode, $ is also used as the prefix for a
+ hexadecimal constant. */
+ integer_constant (16, expressionP);
+ break;
+ }
+
+ if (is_part_of_name (*input_line_pointer))
+ goto isname;
+
+ current_location (expressionP);
+ break;
+
case '.':
if (!is_part_of_name (*input_line_pointer))
{
- char *fake;
- extern struct obstack frags;
-
- /* JF: '.' is pseudo symbol with value of current location
- in current segment. */
-#ifdef DOT_LABEL_PREFIX
- fake = ".L0\001";
-#else
- fake = "L0\001";
-#endif
- symbolP = symbol_new (fake,
- now_seg,
- (valueT) ((char*)obstack_next_free (&frags) - frag_now->fr_literal),
- frag_now);
-
- expressionP->X_add_number = 0;
- expressionP->X_add_symbol = symbolP;
- expressionP->X_seg = now_seg;
+ current_location (expressionP);
break;
+ }
+ else if ((strncasecmp (input_line_pointer, "startof.", 8) == 0
+ && ! is_part_of_name (input_line_pointer[8]))
+ || (strncasecmp (input_line_pointer, "sizeof.", 7) == 0
+ && ! is_part_of_name (input_line_pointer[7])))
+ {
+ int start;
+
+ start = (input_line_pointer[1] == 't'
+ || input_line_pointer[1] == 'T');
+ input_line_pointer += start ? 8 : 7;
+ SKIP_WHITESPACE ();
+ if (*input_line_pointer != '(')
+ as_bad ("syntax error in .startof. or .sizeof.");
+ else
+ {
+ char *buf;
+
+ ++input_line_pointer;
+ SKIP_WHITESPACE ();
+ name = input_line_pointer;
+ c = get_symbol_end ();
+ buf = (char *) xmalloc (strlen (name) + 10);
+ if (start)
+ sprintf (buf, ".startof.%s", name);
+ else
+ sprintf (buf, ".sizeof.%s", name);
+ symbolP = symbol_make (buf);
+ free (buf);
+
+ expressionP->X_op = O_symbol;
+ expressionP->X_add_symbol = symbolP;
+ expressionP->X_add_number = 0;
+
+ *input_line_pointer = c;
+ SKIP_WHITESPACE ();
+ if (*input_line_pointer != ')')
+ as_bad ("syntax error in .startof. or .sizeof.");
+ else
+ ++input_line_pointer;
+ }
+ break;
}
else
{
goto isname;
-
-
}
case ',':
case '\n':
case '\0':
eol:
/* can't imagine any other kind of operand */
- expressionP->X_seg = absent_section;
+ expressionP->X_op = O_absent;
input_line_pointer--;
- md_operand (expressionP);
+ break;
+
+ case '%':
+ if (! flag_mri)
+ goto de_fault;
+ integer_constant (2, expressionP);
+ break;
+
+ case '@':
+ if (! flag_mri)
+ goto de_fault;
+ integer_constant (8, expressionP);
+ break;
+
+ case ':':
+ if (! flag_mri)
+ goto de_fault;
+
+ /* In MRI mode, this is a floating point constant represented
+ using hexadecimal digits. */
+
+ ++input_line_pointer;
+ integer_constant (16, expressionP);
+ break;
+
+ case '*':
+ if (! flag_mri || is_part_of_name (*input_line_pointer))
+ goto de_fault;
+
+ current_location (expressionP);
break;
default:
- if (is_end_of_line[c])
+ de_fault:
+ if (is_end_of_line[(unsigned char) c])
goto eol;
if (is_name_beginner (c)) /* here if did not begin with a digit */
{
name = --input_line_pointer;
c = get_symbol_end ();
symbolP = symbol_find_or_make (name);
- /* If we have an absolute symbol or a reg, then we know its value
- now. */
- expressionP->X_seg = S_GET_SEGMENT (symbolP);
- if (expressionP->X_seg == absolute_section
- || expressionP->X_seg == reg_section)
- expressionP->X_add_number = S_GET_VALUE (symbolP);
+
+ /* If we have an absolute symbol or a reg, then we know its
+ value now. */
+ segment = S_GET_SEGMENT (symbolP);
+ if (segment == absolute_section)
+ {
+ expressionP->X_op = O_constant;
+ expressionP->X_add_number = S_GET_VALUE (symbolP);
+ }
+ else if (segment == reg_section)
+ {
+ expressionP->X_op = O_register;
+ expressionP->X_add_number = S_GET_VALUE (symbolP);
+ }
else
{
- expressionP->X_add_number = 0;
+ expressionP->X_op = O_symbol;
expressionP->X_add_symbol = symbolP;
+ expressionP->X_add_number = 0;
}
*input_line_pointer = c;
- expressionP->X_subtract_symbol = NULL;
}
else
{
- as_bad ("Bad expression");
- expressionP->X_add_number = 0;
- expressionP->X_seg = absolute_section;
+ /* Let the target try to parse it. Success is indicated by changing
+ the X_op field to something other than O_absent and pointing
+ input_line_pointer passed the expression. If it can't parse the
+ expression, X_op and input_line_pointer should be unchanged. */
+ expressionP->X_op = O_absent;
+ --input_line_pointer;
+ md_operand (expressionP);
+ if (expressionP->X_op == O_absent)
+ {
+ ++input_line_pointer;
+ as_bad ("Bad expression");
+ expressionP->X_op = O_constant;
+ expressionP->X_add_number = 0;
+ }
}
+ break;
}
/*
clean_up_expression (expressionP);
SKIP_WHITESPACE (); /*->1st char after operand. */
know (*input_line_pointer != ' ');
- return (expressionP->X_seg);
+
+ /* The PA port needs this information. */
+ if (expressionP->X_add_symbol)
+ expressionP->X_add_symbol->sy_used = 1;
+
+ switch (expressionP->X_op)
+ {
+ default:
+ return absolute_section;
+ case O_symbol:
+ return S_GET_SEGMENT (expressionP->X_add_symbol);
+ case O_register:
+ return reg_section;
+ }
} /* operand() */
\f
-
/* Internal. Simplify a struct expression for use by expr() */
/*
* In: address of a expressionS.
- * The X_seg field of the expressionS may only take certain values.
- * Now, we permit SEG_PASS1 to make code smaller & faster.
+ * The X_op field of the expressionS may only take certain values.
* Elsewise we waste time special-case testing. Sigh. Ditto SEG_ABSENT.
* Out: expressionS may have been modified:
* 'foo-foo' symbol references cancelled to 0,
- * which changes X_seg from SEG_DIFFERENCE to SEG_ABSOLUTE;
+ * which changes X_op from O_subtract to O_constant.
* Unused fields zeroed to help expr().
*/
clean_up_expression (expressionP)
expressionS *expressionP;
{
- segT s = expressionP->X_seg;
- if (s == absent_section
- || s == pass1_section)
+ switch (expressionP->X_op)
{
- expressionP->X_add_symbol = NULL;
- expressionP->X_subtract_symbol = NULL;
+ case O_illegal:
+ case O_absent:
expressionP->X_add_number = 0;
- }
- else if (s == big_section
- || s == absolute_section)
- {
- expressionP->X_subtract_symbol = NULL;
+ /* Fall through. */
+ case O_big:
+ case O_constant:
+ case O_register:
expressionP->X_add_symbol = NULL;
- }
- else if (s == undefined_section)
- expressionP->X_subtract_symbol = NULL;
- else if (s == diff_section)
- {
- /*
- * It does not hurt to 'cancel' NULL==NULL
- * when comparing symbols for 'eq'ness.
- * It is faster to re-cancel them to NULL
- * than to check for this special case.
- */
- if (expressionP->X_subtract_symbol == expressionP->X_add_symbol
- || (expressionP->X_subtract_symbol
- && expressionP->X_add_symbol
- && (expressionP->X_subtract_symbol->sy_frag
- == expressionP->X_add_symbol->sy_frag)
- && (S_GET_VALUE (expressionP->X_subtract_symbol)
+ /* Fall through. */
+ case O_symbol:
+ case O_uminus:
+ case O_bit_not:
+ expressionP->X_op_symbol = NULL;
+ break;
+ case O_subtract:
+ if (expressionP->X_op_symbol == expressionP->X_add_symbol
+ || ((expressionP->X_op_symbol->sy_frag
+ == expressionP->X_add_symbol->sy_frag)
+ && SEG_NORMAL (S_GET_SEGMENT (expressionP->X_add_symbol))
+ && (S_GET_VALUE (expressionP->X_op_symbol)
== S_GET_VALUE (expressionP->X_add_symbol))))
{
- expressionP->X_subtract_symbol = NULL;
- expressionP->X_add_symbol = NULL;
- expressionP->X_seg = absolute_section;
- }
- }
- else if (s == reg_section)
- {
- expressionP->X_add_symbol = NULL;
- expressionP->X_subtract_symbol = NULL;
- }
- else
- {
- if (SEG_NORMAL (expressionP->X_seg))
- {
- expressionP->X_subtract_symbol = NULL;
- }
- else
- {
- BAD_CASE (expressionP->X_seg);
- }
- }
-}
-\f
-/*
- * expr_part ()
- *
- * Internal. Made a function because this code is used in 2 places.
- * Generate error or correct X_?????_symbol of expressionS.
- */
-
-/*
- * symbol_1 += symbol_2 ... well ... sort of.
- */
+ addressT diff = (S_GET_VALUE (expressionP->X_add_symbol)
+ - S_GET_VALUE (expressionP->X_op_symbol));
-static segT
-expr_part (symbol_1_PP, symbol_2_P)
- symbolS **symbol_1_PP;
- symbolS *symbol_2_P;
-{
- segT return_value;
-
-#if !defined (BFD_ASSEMBLER) && (defined (OBJ_AOUT) || defined (OBJ_BOUT))
- int test = ((*symbol_1_PP) == NULL
- || (S_GET_SEGMENT (*symbol_1_PP) == text_section)
- || (S_GET_SEGMENT (*symbol_1_PP) == data_section)
- || (S_GET_SEGMENT (*symbol_1_PP) == bss_section)
- || (!S_IS_DEFINED (*symbol_1_PP)));
- assert (test);
- test = (symbol_2_P == NULL
- || (S_GET_SEGMENT (symbol_2_P) == text_section)
- || (S_GET_SEGMENT (symbol_2_P) == data_section)
- || (S_GET_SEGMENT (symbol_2_P) == bss_section)
- || (!S_IS_DEFINED (symbol_2_P)));
- assert (test);
-#endif
- if (*symbol_1_PP)
- {
- if (!S_IS_DEFINED (*symbol_1_PP))
- {
- if (symbol_2_P)
- {
- return_value = pass1_section;
- *symbol_1_PP = NULL;
- }
- else
- {
- know (!S_IS_DEFINED (*symbol_1_PP));
- return_value = undefined_section;
- }
- }
- else
- {
- if (symbol_2_P)
- {
- if (!S_IS_DEFINED (symbol_2_P))
- {
- *symbol_1_PP = NULL;
- return_value = pass1_section;
- }
- else
- {
- /* {seg1} - {seg2} */
- as_bad ("Expression too complex, 2 symbolS forgotten: \"%s\" \"%s\"",
- S_GET_NAME (*symbol_1_PP), S_GET_NAME (symbol_2_P));
- *symbol_1_PP = NULL;
- return_value = absolute_section;
- }
- }
- else
- {
- return_value = S_GET_SEGMENT (*symbol_1_PP);
- }
- }
- }
- else
- { /* (* symbol_1_PP) == NULL */
- if (symbol_2_P)
- {
- *symbol_1_PP = symbol_2_P;
- return_value = S_GET_SEGMENT (symbol_2_P);
- }
- else
- {
- *symbol_1_PP = NULL;
- return_value = absolute_section;
+ expressionP->X_op = O_constant;
+ expressionP->X_add_symbol = NULL;
+ expressionP->X_op_symbol = NULL;
+ expressionP->X_add_number += diff;
}
+ break;
+ default:
+ break;
}
-#if defined (OBJ_AOUT) && !defined (BFD_ASSEMBLER)
- test = (return_value == absolute_section
- || return_value == text_section
- || return_value == data_section
- || return_value == bss_section
- || return_value == undefined_section
- || return_value == pass1_section);
- assert (test);
-#endif
- know ((*symbol_1_PP) == NULL
- || (S_GET_SEGMENT (*symbol_1_PP) == return_value));
- return (return_value);
}
\f
/* Expression parser. */
* After expr(RANK,resultP) input_line_pointer->operator of rank <= RANK.
* Also, we have consumed any leading or trailing spaces (operand does that)
* and done all intervening operators.
+ *
+ * This returns the segment of the result, which will be
+ * absolute_section or the segment of a symbol.
*/
-typedef enum
-{
- O_illegal, /* (0) what we get for illegal op */
-
- O_multiply, /* (1) * */
- O_divide, /* (2) / */
- O_modulus, /* (3) % */
- O_left_shift, /* (4) < */
- O_right_shift, /* (5) > */
- O_bit_inclusive_or, /* (6) | */
- O_bit_or_not, /* (7) ! */
- O_bit_exclusive_or, /* (8) ^ */
- O_bit_and, /* (9) & */
- O_add, /* (10) + */
- O_subtract /* (11) - */
-}
-
-operatorT;
-
#undef __
#define __ O_illegal
-static const operatorT op_encoding[256] =
+static operatorT op_encoding[256] =
{ /* maps ASCII->operators */
__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,
__, O_bit_or_not, __, __, __, O_modulus, O_bit_and, __,
__, __, O_multiply, O_add, __, O_subtract, __, O_divide,
__, __, __, __, __, __, __, __,
- __, __, __, __, O_left_shift, __, O_right_shift, __,
+ __, __, __, __, O_lt, __, O_gt, __,
__, __, __, __, __, __, __, __,
__, __, __, __, __, __, __, __,
__, __, __, __, __, __, __, __,
/*
* Rank Examples
* 0 operand, (expression)
- * 1 + -
- * 2 & ^ ! |
- * 3 * / % << >>
+ * 1 = <> < <= >= >
+ * 2 + -
+ * 3 used for * / % in MRI mode
+ * 4 & ^ ! |
+ * 5 * / % << >>
+ * 6 unary - unary ~
*/
-static const operator_rankT
- op_rank[] =
-{0, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1};
+static operator_rankT op_rank[] =
+{
+ 0, /* O_illegal */
+ 0, /* O_absent */
+ 0, /* O_constant */
+ 0, /* O_symbol */
+ 0, /* O_register */
+ 0, /* O_bit */
+ 6, /* O_uminus */
+ 6, /* O_bit_not */
+ 5, /* O_multiply */
+ 5, /* O_divide */
+ 5, /* O_modulus */
+ 5, /* O_left_shift */
+ 5, /* O_right_shift */
+ 4, /* O_bit_inclusive_or */
+ 4, /* O_bit_or_not */
+ 4, /* O_bit_exclusive_or */
+ 4, /* O_bit_and */
+ 2, /* O_add */
+ 2, /* O_subtract */
+ 1, /* O_eq */
+ 1, /* O_ne */
+ 1, /* O_lt */
+ 1, /* O_le */
+ 1, /* O_ge */
+ 1 /* O_gt */
+};
+
+/* Initialize the expression parser. */
+
+void
+expr_begin ()
+{
+ /* In MRI mode, multiplication and division have lower precedence
+ than the bit wise operators. */
+ if (flag_mri)
+ {
+ op_rank[O_multiply] = 3;
+ op_rank[O_divide] = 3;
+ op_rank[O_modulus] = 3;
+ op_encoding['"'] = O_bit_not;
+ }
+}
\f
-/* Return resultP->X_seg. */
-segT
+/* Return the encoding for the operator at INPUT_LINE_POINTER.
+ Advance INPUT_LINE_POINTER to the last character in the operator
+ (i.e., don't change it for a single character operator). */
+
+static inline operatorT
+operator ()
+{
+ int c;
+ operatorT ret;
+
+ c = *input_line_pointer;
+
+ switch (c)
+ {
+ default:
+ return op_encoding[c];
+
+ case '<':
+ switch (input_line_pointer[1])
+ {
+ default:
+ return op_encoding[c];
+ case '<':
+ ret = O_left_shift;
+ break;
+ case '>':
+ ret = O_ne;
+ break;
+ case '=':
+ ret = O_le;
+ break;
+ }
+ ++input_line_pointer;
+ return ret;
+
+ case '>':
+ switch (input_line_pointer[1])
+ {
+ default:
+ return op_encoding[c];
+ case '>':
+ ret = O_right_shift;
+ break;
+ case '=':
+ ret = O_ge;
+ break;
+ }
+ ++input_line_pointer;
+ return ret;
+
+ case '!':
+ /* We accept !! as equivalent to ^ for MRI compatibility. */
+ if (input_line_pointer[1] != '!')
+ {
+ if (flag_mri)
+ return O_bit_inclusive_or;
+ return op_encoding[c];
+ }
+ ++input_line_pointer;
+ return O_bit_exclusive_or;
+ }
+
+ /*NOTREACHED*/
+}
+
+/* Parse an expression. */
+
+segT
expr (rank, resultP)
operator_rankT rank; /* Larger # is higher rank. */
expressionS *resultP; /* Deliver result here. */
{
+ segT retval;
expressionS right;
operatorT op_left;
- char c_left; /* 1st operator character. */
operatorT op_right;
- char c_right;
know (rank >= 0);
- (void) operand (resultP);
+
+ retval = operand (resultP);
+
know (*input_line_pointer != ' '); /* Operand() gobbles spaces. */
- c_left = *input_line_pointer; /* Potential operator character. */
- op_left = op_encoding[c_left];
+
+ op_left = operator ();
while (op_left != O_illegal && op_rank[(int) op_left] > rank)
{
+ segT rightseg;
+
input_line_pointer++; /*->after 1st character of operator. */
- /* Operators "<<" and ">>" have 2 characters. */
- if (*input_line_pointer == c_left && (c_left == '<' || c_left == '>'))
- {
- input_line_pointer++;
- } /*->after operator. */
- if (absent_section == expr (op_rank[(int) op_left], &right))
+
+ rightseg = expr (op_rank[(int) op_left], &right);
+ if (right.X_op == O_absent)
{
- as_warn ("Missing operand value assumed absolute 0.");
- resultP->X_add_number = 0;
- resultP->X_subtract_symbol = NULL;
- resultP->X_add_symbol = NULL;
- resultP->X_seg = absolute_section;
+ as_warn ("missing operand; zero assumed");
+ right.X_op = O_constant;
+ right.X_add_number = 0;
+ right.X_add_symbol = NULL;
+ right.X_op_symbol = NULL;
}
+
know (*input_line_pointer != ' ');
- c_right = *input_line_pointer;
- op_right = op_encoding[c_right];
- if (*input_line_pointer == c_right && (c_right == '<' || c_right == '>'))
+
+ if (retval == undefined_section)
{
- input_line_pointer++;
- } /*->after operator. */
- know ((int) op_right == 0 || op_rank[(int) op_right] <= op_rank[(int) op_left]);
+ if (SEG_NORMAL (rightseg))
+ retval = rightseg;
+ }
+ else if (! SEG_NORMAL (retval))
+ retval = rightseg;
+ else if (SEG_NORMAL (rightseg)
+ && retval != rightseg
+#ifdef DIFF_EXPR_OK
+ && op_left != O_subtract
+#endif
+ )
+ as_bad ("operation combines symbols in different segments");
+
+ op_right = operator ();
+
+ know (op_right == O_illegal || op_rank[(int) op_right] <= op_rank[(int) op_left]);
+ know ((int) op_left >= (int) O_multiply && (int) op_left <= (int) O_gt);
+
/* input_line_pointer->after right-hand quantity. */
/* left-hand quantity in resultP */
/* right-hand quantity in right. */
/* operator in op_left. */
- if (resultP->X_seg == pass1_section || right.X_seg == pass1_section)
+
+ if (resultP->X_op == O_big)
{
- resultP->X_seg = pass1_section;
+ as_warn ("left operand is a %s; integer 0 assumed",
+ resultP->X_add_number > 0 ? "bignum" : "float");
+ resultP->X_op = O_constant;
+ resultP->X_add_number = 0;
+ resultP->X_add_symbol = NULL;
+ resultP->X_op_symbol = NULL;
}
- else
+ if (right.X_op == O_big)
{
- if (resultP->X_seg == big_section)
- {
- as_warn ("Left operand of %c is a %s. Integer 0 assumed.",
- c_left, resultP->X_add_number > 0 ? "bignum" : "float");
- resultP->X_seg = absolute_section;
- resultP->X_add_symbol = 0;
- resultP->X_subtract_symbol = 0;
- resultP->X_add_number = 0;
- }
- if (right.X_seg == big_section)
+ as_warn ("right operand is a %s; integer 0 assumed",
+ right.X_add_number > 0 ? "bignum" : "float");
+ right.X_op = O_constant;
+ right.X_add_number = 0;
+ right.X_add_symbol = NULL;
+ right.X_op_symbol = NULL;
+ }
+
+ /* Optimize common cases. */
+ if (op_left == O_add && right.X_op == O_constant)
+ {
+ /* X + constant. */
+ resultP->X_add_number += right.X_add_number;
+ }
+ /* This case comes up in PIC code. */
+ else if (op_left == O_subtract
+ && right.X_op == O_symbol
+ && resultP->X_op == O_symbol
+ && (right.X_add_symbol->sy_frag
+ == resultP->X_add_symbol->sy_frag)
+ && SEG_NORMAL (S_GET_SEGMENT (right.X_add_symbol)))
+
+ {
+ resultP->X_add_number += right.X_add_number;
+ resultP->X_add_number += (S_GET_VALUE (resultP->X_add_symbol)
+ - S_GET_VALUE (right.X_add_symbol));
+ resultP->X_op = O_constant;
+ resultP->X_add_symbol = 0;
+ }
+ else if (op_left == O_subtract && right.X_op == O_constant)
+ {
+ /* X - constant. */
+ resultP->X_add_number -= right.X_add_number;
+ }
+ else if (op_left == O_add && resultP->X_op == O_constant)
+ {
+ /* Constant + X. */
+ resultP->X_op = right.X_op;
+ resultP->X_add_symbol = right.X_add_symbol;
+ resultP->X_op_symbol = right.X_op_symbol;
+ resultP->X_add_number += right.X_add_number;
+ retval = rightseg;
+ }
+ else if (resultP->X_op == O_constant && right.X_op == O_constant)
+ {
+ /* Constant OP constant. */
+ offsetT v = right.X_add_number;
+ if (v == 0 && (op_left == O_divide || op_left == O_modulus))
{
- as_warn ("Right operand of %c is a %s. Integer 0 assumed.",
- c_left, right.X_add_number > 0 ? "bignum" : "float");
- right.X_seg = absolute_section;
- right.X_add_symbol = 0;
- right.X_subtract_symbol = 0;
- right.X_add_number = 0;
+ as_warn ("division by zero");
+ v = 1;
}
- if (op_left == O_subtract)
+ switch (op_left)
{
- /*
- * Convert - into + by exchanging symbolS and negating number.
- * I know -infinity can't be negated in 2's complement:
- * but then it can't be subtracted either. This trick
- * does not cause any further inaccuracy.
- */
-
- symbolS *symbolP;
-
- right.X_add_number = -right.X_add_number;
- symbolP = right.X_add_symbol;
- right.X_add_symbol = right.X_subtract_symbol;
- right.X_subtract_symbol = symbolP;
- if (symbolP)
- {
- right.X_seg = diff_section;
- }
- op_left = O_add;
+ default: abort ();
+ case O_multiply: resultP->X_add_number *= v; break;
+ case O_divide: resultP->X_add_number /= v; break;
+ case O_modulus: resultP->X_add_number %= v; break;
+ case O_left_shift: resultP->X_add_number <<= v; break;
+ case O_right_shift: resultP->X_add_number >>= v; break;
+ case O_bit_inclusive_or: resultP->X_add_number |= v; break;
+ case O_bit_or_not: resultP->X_add_number |= ~v; break;
+ case O_bit_exclusive_or: resultP->X_add_number ^= v; break;
+ case O_bit_and: resultP->X_add_number &= v; break;
+ case O_add: resultP->X_add_number += v; break;
+ case O_subtract: resultP->X_add_number -= v; break;
+ case O_eq:
+ resultP->X_add_number =
+ resultP->X_add_number == v ? ~ (offsetT) 0 : 0;
+ break;
+ case O_ne:
+ resultP->X_add_number =
+ resultP->X_add_number != v ? ~ (offsetT) 0 : 0;
+ break;
+ case O_lt:
+ resultP->X_add_number =
+ resultP->X_add_number < v ? ~ (offsetT) 0 : 0;
+ break;
+ case O_le:
+ resultP->X_add_number =
+ resultP->X_add_number <= v ? ~ (offsetT) 0 : 0;
+ break;
+ case O_ge:
+ resultP->X_add_number =
+ resultP->X_add_number >= v ? ~ (offsetT) 0 : 0;
+ break;
+ case O_gt:
+ resultP->X_add_number =
+ resultP->X_add_number > v ? ~ (offsetT) 0 : 0;
+ break;
}
-\f
+ }
+ else if (resultP->X_op == O_symbol
+ && right.X_op == O_symbol
+ && (op_left == O_add
+ || op_left == O_subtract
+ || (resultP->X_add_number == 0
+ && right.X_add_number == 0)))
+ {
+ /* Symbol OP symbol. */
+ resultP->X_op = op_left;
+ resultP->X_op_symbol = right.X_add_symbol;
if (op_left == O_add)
- {
- segT seg1;
- segT seg2;
-#if 0 /* @@ This rejects stuff in common sections too. Figure out some
- reasonable test, and make it clean... */
-#if !defined (MANY_SEGMENTS) && !defined (OBJ_ECOFF)
- know (resultP->X_seg == data_section || resultP->X_seg == text_section || resultP->X_seg == bss_section || resultP->X_seg == undefined_section || resultP->X_seg == diff_section || resultP->X_seg == absolute_section || resultP->X_seg == pass1_section || resultP->X_seg == reg_section);
-
- know (right.X_seg == data_section || right.X_seg == text_section || right.X_seg == bss_section || right.X_seg == undefined_section || right.X_seg == diff_section || right.X_seg == absolute_section || right.X_seg == pass1_section);
-#endif
-#endif /* 0 */
- clean_up_expression (&right);
- clean_up_expression (resultP);
-
- seg1 = expr_part (&resultP->X_add_symbol, right.X_add_symbol);
- seg2 = expr_part (&resultP->X_subtract_symbol, right.X_subtract_symbol);
- if (seg1 == pass1_section || seg2 == pass1_section)
- {
- need_pass_2 = 1;
- resultP->X_seg = pass1_section;
- }
- else if (seg2 == absolute_section)
- resultP->X_seg = seg1;
- else if (seg1 != undefined_section
- && seg1 != absolute_section
- && seg2 != undefined_section
- && seg1 != seg2)
- {
- know (seg2 != absolute_section);
- know (resultP->X_subtract_symbol);
-#ifndef MANY_SEGMENTS
-#ifndef OBJ_ECOFF
- know (seg1 == text_section || seg1 == data_section || seg1 == bss_section);
- know (seg2 == text_section || seg2 == data_section || seg2 == bss_section);
-#endif
-#endif
- know (resultP->X_add_symbol);
- know (resultP->X_subtract_symbol);
- as_bad ("Expression too complex: forgetting %s - %s",
- S_GET_NAME (resultP->X_add_symbol),
- S_GET_NAME (resultP->X_subtract_symbol));
- resultP->X_seg = absolute_section;
- /* Clean_up_expression() will do the rest. */
- }
- else
- resultP->X_seg = diff_section;
+ resultP->X_add_number += right.X_add_number;
+ else if (op_left == O_subtract)
+ resultP->X_add_number -= right.X_add_number;
+ }
+ else
+ {
+ /* The general case. */
+ resultP->X_add_symbol = make_expr_symbol (resultP);
+ resultP->X_op_symbol = make_expr_symbol (&right);
+ resultP->X_op = op_left;
+ resultP->X_add_number = 0;
+ resultP->X_unsigned = 1;
+ }
- resultP->X_add_number += right.X_add_number;
- clean_up_expression (resultP);
- }
- else
- { /* Not +. */
- if (resultP->X_seg == undefined_section || right.X_seg == undefined_section)
- {
- resultP->X_seg = pass1_section;
- need_pass_2 = 1;
- }
- else
- {
- resultP->X_subtract_symbol = NULL;
- resultP->X_add_symbol = NULL;
- /* Will be absolute_section. */
- if (resultP->X_seg != absolute_section || right.X_seg != absolute_section)
- {
- as_bad ("Relocation error: Symbolic expressions may only involve");
- as_bad (" addition and subtraction. Absolute 0 assumed.");
- resultP->X_seg = absolute_section;
- resultP->X_add_number = 0;
- }
- else
- {
- switch (op_left)
- {
- case O_bit_inclusive_or:
- resultP->X_add_number |= right.X_add_number;
- break;
-
- case O_modulus:
- if (right.X_add_number)
- {
- resultP->X_add_number %= right.X_add_number;
- }
- else
- {
- as_warn ("Division by 0. Result of 0 substituted.");
- resultP->X_add_number = 0;
- }
- break;
-
- case O_bit_and:
- resultP->X_add_number &= right.X_add_number;
- break;
-
- case O_multiply:
- resultP->X_add_number *= right.X_add_number;
- break;
-
- case O_divide:
- if (right.X_add_number)
- {
- resultP->X_add_number /= right.X_add_number;
- }
- else
- {
- as_warn ("Division by 0. 0 assumed.");
- resultP->X_add_number = 0;
- }
- break;
-
- case O_left_shift:
- resultP->X_add_number <<= right.X_add_number;
- break;
-
- case O_right_shift:
- /* @@ We should distinguish signed versus
- unsigned here somehow. */
- resultP->X_add_number >>= right.X_add_number;
- break;
-
- case O_bit_exclusive_or:
- resultP->X_add_number ^= right.X_add_number;
- break;
-
- case O_bit_or_not:
- resultP->X_add_number |= ~right.X_add_number;
- break;
-
- default:
- BAD_CASE (op_left);
- break;
- } /* switch(operator) */
- }
- } /* If we have to force need_pass_2. */
- } /* If operator was +. */
- } /* If we didn't set need_pass_2. */
op_left = op_right;
} /* While next operator is >= this rank. */
- return (resultP->X_seg);
+
+ /* The PA port needs this information. */
+ if (resultP->X_add_symbol)
+ resultP->X_add_symbol->sy_used = 1;
+
+ return resultP->X_op == O_constant ? absolute_section : retval;
}
\f
/*
{
char c;
- while (is_part_of_name (c = *input_line_pointer++))
+ /* We accept \001 in a name in case this is being called with a
+ constructed string. */
+ while (is_part_of_name (c = *input_line_pointer++)
+ || c == '\001')
;
*--input_line_pointer = 0;
return (c);
}
-unsigned int
+unsigned int
get_single_number ()
{
expressionS exp;
projects / binutils.git / blobdiff