/* expr.c -operands, expressions-
- Copyright (C) 1987, 1990, 1991 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.
-
+
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. */
+ 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"
-#ifdef __STDC__
-static void clean_up_expression(expressionS *expressionP);
-#else /* __STDC__ */
-static void clean_up_expression(); /* Internal. */
-#endif /* __STDC__ */
-extern const char EXP_CHARS[]; /* JF hide MD floating pt stuff all the same place */
-extern const char FLT_CHARS[];
+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 clean_up_expression PARAMS ((expressionS * expressionP));
-#ifdef LOCAL_LABELS_DOLLAR
-extern int local_label_defined[];
-#endif
+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.
*/
-/* LITTLENUM_TYPE generic_buffer [6]; */ /* JF this is a hack */
/* Seems atof_machine can backscan through generic_bignum and hit whatever
happens to be loaded before it in memory. And its way too complicated
for me to fix right. Thus a hack. JF: Just make generic_bignum bigger,
and never write into the early words, thus they'll always be zero.
- I hate Dean's floating-point code. Bleh.
- */
-LITTLENUM_TYPE generic_bignum [SIZE_OF_LARGE_NUMBER+6];
-FLONUM_TYPE generic_floating_point_number =
+ I hate Dean's floating-point code. Bleh. */
+LITTLENUM_TYPE generic_bignum[SIZE_OF_LARGE_NUMBER + 6];
+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) */
- 0, /* leader */
- 0, /* exponent */
- 0 /* sign */
- };
+ &generic_bignum[6], /* low (JF: Was 0) */
+ &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
-/*
- * 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.
- * Input_line_pointer->(next non-blank) char after operand.
- *
- */
-\f
-static segT
- operand (expressionP)
-register expressionS * expressionP;
+static void
+floating_constant (expressionP)
+ expressionS *expressionP;
{
- register char c;
- register char *name; /* points to name of symbol */
- register symbolS * symbolP; /* Points to symbol */
-
- extern char hex_value[]; /* In hex_value.c */
-
- SKIP_WHITESPACE(); /* Leading whitespace is part of operand. */
- c = * input_line_pointer ++; /* Input_line_pointer->past char in c. */
- if (isdigit(c) || (c == 'H' && input_line_pointer[0] == '\''))
+ /* input_line_pointer->*/
+ /* floating-point constant. */
+ int error_code;
+
+ error_code = atof_generic (&input_line_pointer, ".", EXP_CHARS,
+ &generic_floating_point_number);
+
+ if (error_code)
{
- register valueT number; /* offset or (absolute) value */
- register short int digit; /* value of next digit in current radix */
- /* invented for humans only, hope */
- /* optimising compiler flushes it! */
- register short int radix; /* 2, 8, 10 or 16 */
- /* 0 means we saw start of a floating- */
- /* point constant. */
- register short int maxdig = 0;/* Highest permitted digit value. */
- register int too_many_digits = 0; /* If we see >= this number of */
- /* digits, assume it is a bignum. */
- register char * digit_2; /*->2nd digit of number. */
- int small; /* TRUE if fits in 32 bits. */
-
-
- if (c == 'H' || c == '0') { /* non-decimal radix */
- if ((c = *input_line_pointer ++)=='x' || c=='X' || c=='\'') {
- c = *input_line_pointer ++; /* read past "0x" or "0X" or H' */
- maxdig = radix = 16;
- too_many_digits = 9;
- } else {
- /* 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' || c == 'b' || c == 'B')
- && (!*input_line_pointer ||
- (!strchr("+-.0123456789",*input_line_pointer) &&
- !strchr(EXP_CHARS,*input_line_pointer)))) {
- maxdig = radix = 10;
- too_many_digits = 11;
- c = '0';
- input_line_pointer -= 2;
-
- } else if (c == 'b' || c == 'B') {
- c = *input_line_pointer++;
- maxdig = radix = 2;
- too_many_digits = 33;
-
- } else if (c && strchr(FLT_CHARS,c)) {
- radix = 0; /* Start of floating-point constant. */
- /* input_line_pointer->1st char of number. */
- expressionP->X_add_number = -(isupper(c) ? tolower(c) : c);
-
- } else { /* By elimination, assume octal radix. */
- radix = maxdig = 8;
- too_many_digits = 11;
- }
- } /* c == char after "0" or "0x" or "0X" or "0e" etc. */
- } else {
- maxdig = radix = 10;
- too_many_digits = 11;
- } /* if operand starts with a zero */
-
- if (radix) { /* Fixed-point integer constant. */
- /* May be bignum, or may fit in 32 bits. */
- /*
- * Most numbers fit into 32 bits, and we want this case to be fast.
- * So we pretend it will fit into 32 bits. If, after making up a 32
- * bit number, we realise that we have scanned more digits than
- * comfortably fit into 32 bits, we re-scan the digits coding
- * them into a bignum. For decimal and octal numbers we are conservative: some
- * numbers may be assumed bignums when in fact they do fit into 32 bits.
- * Numbers of any radix can have excess leading zeros: we strive
- * to recognise this and cast them back into 32 bits.
- * We must check that the bignum really is more than 32
- * bits, and change it back to a 32-bit number if it fits.
- * The 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.
- */
- digit_2 = input_line_pointer;
- for (number=0; (digit=hex_value[c])<maxdig; c = * input_line_pointer ++)
+ if (error_code == ERROR_EXPONENT_OVERFLOW)
+ {
+ as_bad ("bad floating-point constant: exponent overflow, probably assembling junk");
+ }
+ else
+ {
+ as_bad ("bad floating-point constant: unknown error code=%d.", error_code);
+ }
+ }
+ expressionP->X_op = O_big;
+ /* input_line_pointer->just after constant, */
+ /* which may point to whitespace. */
+ expressionP->X_add_number = -1;
+}
+
+static void
+integer_constant (radix, expressionP)
+ int radix;
+ expressionS *expressionP;
+{
+ 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. */
+ int too_many_digits = 0; /* if we see >= this number of */
+ char *name; /* points to name of symbol */
+ symbolS *symbolP; /* points to symbol */
+
+ int small; /* true if fits in 32 bits. */
+
+ /* May be bignum, or may fit in 32 bits. */
+ /* Most numbers fit into 32 bits, and we want this case to be fast.
+ so we pretend it will fit into 32 bits. If, after making up a 32
+ bit number, we realise that we have scanned more digits than
+ comfortably fit into 32 bits, we re-scan the digits coding them
+ into a bignum. For decimal and octal numbers we are
+ conservative: Some numbers may be assumed bignums when in fact
+ they do fit into 32 bits. Numbers of any radix can have excess
+ leading zeros: We strive to recognise this and cast them back
+ into 32 bits. We must check that the bignum really is more than
+ 32 bits, and change it back to a 32-bit number if it fits. The
+ 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
+
+ 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)
{
- number = number * radix + digit;
+ floating_constant (expressionP);
+ return;
}
- /* C contains character after number. */
- /* Input_line_pointer->char after C. */
- small = input_line_pointer - digit_2 < too_many_digits;
- if (! small)
+ else
{
- /*
- * We saw a lot of digits. Manufacture a bignum the hard way.
- */
- LITTLENUM_TYPE * leader; /*->high order littlenum of the bignum. */
- LITTLENUM_TYPE * pointer; /*->littlenum we are frobbing now. */
- long carry;
-
- 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. */
- c = *input_line_pointer ++;
- for (; (carry = hex_value [c]) < maxdig; c = * input_line_pointer ++)
- {
- for (pointer = generic_bignum;
- pointer <= leader;
- pointer ++)
- {
- long work;
-
- work = carry + radix * * pointer;
- * pointer = work & LITTLENUM_MASK;
- carry = work >> LITTLENUM_NUMBER_OF_BITS;
- }
- if (carry)
- {
- if (leader < generic_bignum + SIZE_OF_LARGE_NUMBER - 1)
- { /* 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. */
- number =
- ((generic_bignum [1] & LITTLENUM_MASK) << LITTLENUM_NUMBER_OF_BITS)
- | (generic_bignum [0] & LITTLENUM_MASK);
- small = 1;
- }
- else
- {
- number = leader - generic_bignum + 1; /* Number of littlenums in the bignum. */
- }
+ radix = 10;
+ suffix = NULL;
}
- if (small)
+ }
+ }
+
+ switch (radix)
+ {
+ case 2:
+ maxdig = 2;
+ too_many_digits = valuesize + 1;
+ break;
+ case 8:
+ maxdig = radix = 8;
+ too_many_digits = (valuesize + 2) / 3 + 1;
+ break;
+ case 16:
+ maxdig = radix = 16;
+ too_many_digits = (valuesize + 3) / 4 + 1;
+ break;
+ case 10:
+ maxdig = radix = 10;
+ too_many_digits = (valuesize + 12) / 4; /* very rough */
+ }
+#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 - start - 1) < too_many_digits;
+ if (!small)
+ {
+ /*
+ * we saw a lot of digits. manufacture a bignum the hard way.
+ */
+ LITTLENUM_TYPE *leader; /*->high order littlenum of the bignum. */
+ LITTLENUM_TYPE *pointer; /*->littlenum we are frobbing now. */
+ long carry;
+
+ leader = generic_bignum;
+ generic_bignum[0] = 0;
+ generic_bignum[1] = 0;
+ input_line_pointer = start; /*->1st digit. */
+ c = *input_line_pointer++;
+ for (;
+ (carry = hex_value (c)) < maxdig;
+ c = *input_line_pointer++)
+ {
+ for (pointer = generic_bignum;
+ pointer <= leader;
+ pointer++)
{
- /*
- * Here with number, in correct radix. c is the next char.
- * Note that unlike Un*x, we allow "011f" "0x9f" to
- * both mean the same as the (conventional) "9f". This is simply easier
- * than checking for strict canonical form. Syntax sux!
- */
- if (number<10)
- {
- if (0
-#ifdef LOCAL_LABELS_FB
- || c=='b'
-#endif
-#ifdef LOCAL_LABELS_DOLLAR
- || (c=='$' && local_label_defined[number])
-#endif
- )
- {
- /*
- * Backward ref to local label.
- * Because it is backward, expect it to be DEFINED.
- */
- /*
- * Construct a local label.
- */
- name = local_label_name ((int)number, 0);
- if (((symbolP = symbol_find(name)) != NULL) /* seen before */
- && (S_IS_DEFINED(symbolP))) /* symbol is defined: OK */
- { /* Expected path: symbol defined. */
- /* Local labels are never absolute. Don't waste time checking absoluteness. */
- know(SEG_NORMAL(S_GET_SEGMENT(symbolP)));
-
- expressionP->X_add_symbol = symbolP;
- expressionP->X_add_number = 0;
- expressionP->X_seg = S_GET_SEGMENT(symbolP);
- }
- else
- { /* Either not seen or not defined. */
- as_bad("Backw. ref to unknown label \"%d:\", 0 assumed.",
- number);
- expressionP->X_add_number = 0;
- expressionP->X_seg = SEG_ABSOLUTE;
- }
- }
- else
- {
- if (0
-#ifdef LOCAL_LABELS_FB
- || c == 'f'
-#endif
-#ifdef LOCAL_LABELS_DOLLAR
- || (c=='$' && !local_label_defined[number])
-#endif
- )
- {
- /*
- * Forward reference. Expect symbol to be undefined or
- * unknown. Undefined: seen it before. Unknown: never seen
- * it in this pass.
- * 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 = local_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) == SEG_UNKNOWN || S_GET_SEGMENT(symbolP) == SEG_TEXT || S_GET_SEGMENT(symbolP) == SEG_DATA);
-#endif
- expressionP->X_add_symbol = symbolP;
- expressionP->X_seg = SEG_UNKNOWN;
- expressionP->X_subtract_symbol = NULL;
- expressionP->X_add_number = 0;
- }
- else
- { /* Really a number, not a local label. */
- expressionP->X_add_number = number;
- expressionP->X_seg = SEG_ABSOLUTE;
- input_line_pointer --; /* Restore following character. */
- } /* if (c=='f') */
- } /* if (c=='b') */
- }
- else
- { /* Really a number. */
- expressionP->X_add_number = number;
- expressionP->X_seg = SEG_ABSOLUTE;
- input_line_pointer --; /* Restore following character. */
- } /* if (number<10) */
+ long work;
+
+ work = carry + radix * *pointer;
+ *pointer = work & LITTLENUM_MASK;
+ carry = work >> LITTLENUM_NUMBER_OF_BITS;
}
- else
- {
- expressionP->X_add_number = number;
- expressionP->X_seg = SEG_BIG;
- input_line_pointer --; /*->char following number. */
- } /* if (small) */
- } /* (If integer constant) */
- else
- { /* input_line_pointer->*/
- /* floating-point constant. */
- int error_code;
-
- error_code = atof_generic
- (& input_line_pointer, ".", EXP_CHARS,
- & generic_floating_point_number);
-
- if (error_code)
+ if (carry)
{
- if (error_code == ERROR_EXPONENT_OVERFLOW)
- {
- as_bad("Bad floating-point constant: exponent overflow, probably assembling junk");
- }
- else
+ if (leader < generic_bignum + SIZE_OF_LARGE_NUMBER - 1)
{
- as_bad("Bad floating-point constant: unknown error code=%d.", error_code);
+ /* room to grow a longer bignum. */
+ *++leader = carry;
}
}
- expressionP->X_seg = SEG_BIG;
- /* input_line_pointer->just after constant, */
- /* which may point to whitespace. */
- know(expressionP->X_add_number < 0); /* < 0 means "floating point". */
- } /* if (not floating-point constant) */
- }
- else if(c=='.' && !is_part_of_name(*input_line_pointer)) {
- extern struct obstack frags;
-
- /*
- JF: '.' is pseudo symbol with value of current location in current
- segment. . .
- */
- symbolP = symbol_new("L0\001",
- now_seg,
- (valueT)(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;
-
- } else if (is_name_beginner(c)) /* here if did not begin with a digit */
- {
- /*
- * Identifier begins here.
- * This is kludged for speed, so code is repeated.
- */
- 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);
- switch (expressionP->X_seg)
- {
- case SEG_ABSOLUTE:
- case SEG_REGISTER:
- expressionP->X_add_number = S_GET_VALUE(symbolP);
- break;
-
- default:
- expressionP->X_add_number = 0;
- expressionP->X_add_symbol = symbolP;
}
- * input_line_pointer = c;
- expressionP->X_subtract_symbol = NULL;
- }
- else if (c=='(')/* didn't begin with digit & not a name */
- {
- (void)expression(expressionP);
- /* Expression() will pass trailing whitespace */
- if (* input_line_pointer ++ != ')')
+ /* again, c is char after number, */
+ /* input_line_pointer->after c. */
+ know (LITTLENUM_NUMBER_OF_BITS == 16);
+ if (leader < generic_bignum + 2)
{
- as_bad("Missing ')' assumed");
- input_line_pointer --;
+ /* will fit into 32 bits. */
+ number =
+ ((generic_bignum[1] & LITTLENUM_MASK) << LITTLENUM_NUMBER_OF_BITS)
+ | (generic_bignum[0] & LITTLENUM_MASK);
+ small = 1;
+ }
+ else
+ {
+ number = leader - generic_bignum + 1; /* number of littlenums in the bignum. */
}
- /* here with input_line_pointer->char after "(...)" */
}
- else if (c == '~' || c == '-' || c == '+') {
- /* unary operator: hope for SEG_ABSOLUTE */
- switch (operand (expressionP)) {
- case SEG_ABSOLUTE:
- /* input_line_pointer->char after operand */
- if (c=='-') {
- expressionP->X_add_number = - expressionP->X_add_number;
- /*
- * Notice: '-' may overflow: no warning is given. This is compatible
- * with other people's assemblers. Sigh.
- */
- } else if (c == '~') {
- expressionP->X_add_number = ~ expressionP->X_add_number;
- } else if (c != '+') {
- know(0);
- } /* switch on unary operator */
- break;
-
- default: /* unary on non-absolute is unsuported */
- if (!SEG_NORMAL(operand(expressionP)))
+
+ if (flag_mri && suffix != NULL && input_line_pointer - 1 == suffix)
+ c = *input_line_pointer++;
+
+ if (small)
+ {
+ /*
+ * here with number, in correct radix. c is the next char.
+ * note that unlike un*x, we allow "011f" "0x9f" to
+ * both mean the same as the (conventional) "9f". this is simply easier
+ * than checking for strict canonical form. syntax sux!
+ */
+
+ 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);
+
+ /* seen before, or symbol is defined: ok */
+ symbolP = symbol_find (name);
+ if ((symbolP != NULL) && (S_IS_DEFINED (symbolP)))
{
- as_bad("Unary operator %c ignored because bad operand follows", c);
- break;
+ /* local labels are never absolute. don't waste time
+ checking absoluteness. */
+ know (SEG_NORMAL (S_GET_SEGMENT (symbolP)));
+
+ expressionP->X_op = O_symbol;
+ expressionP->X_add_symbol = symbolP;
}
- /* Fall through for normal segments ****/
- case SEG_PASS1:
- case SEG_UNKNOWN:
- if(c=='-') { /* JF I hope this hack works */
- expressionP->X_subtract_symbol=expressionP->X_add_symbol;
- expressionP->X_add_symbol=0;
- expressionP->X_seg=SEG_DIFFERENCE;
- break;
+ 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;
}
- /* Expression undisturbed from operand(). */
- }
- }
- else if (c=='\'')
- {
- /*
- * 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 = SEG_ABSOLUTE;
+
+ 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);
+#endif
+ expressionP->X_op = O_symbol;
+ expressionP->X_add_symbol = symbolP;
+ expressionP->X_add_number = 0;
+ } /* case 'f' */
+ else if (LOCAL_LABELS_DOLLAR && c == '$')
+ {
+ /* If the dollar label is *currently* defined, then this is just
+ another reference to it. If it is not *currently* defined,
+ then this is a fresh instantiation of that number, so create
+ it. */
+
+ if (dollar_label_defined ((long) number))
+ {
+ name = dollar_label_name ((long) number, 0);
+ symbolP = symbol_find (name);
+ know (symbolP != NULL);
+ }
+ else
+ {
+ name = dollar_label_name ((long) number, 1);
+ symbolP = symbol_find_or_make (name);
+ }
+
+ expressionP->X_op = O_symbol;
+ expressionP->X_add_symbol = symbolP;
+ expressionP->X_add_number = 0;
+ } /* case '$' */
+ 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
+ else
{
- /* can't imagine any other kind of operand */
- expressionP->X_seg = SEG_ABSENT;
- input_line_pointer --;
- md_operand (expressionP);
+ /* not a small number */
+ expressionP->X_op = O_big;
+ expressionP->X_add_number = number; /* number of littlenums */
+ input_line_pointer--; /*->char following number. */
}
- /*
- * It is more 'efficient' to clean up the expressions when they are created.
- * Doing it here saves lines of code.
- */
- clean_up_expression (expressionP);
- SKIP_WHITESPACE(); /*->1st char after operand. */
- know(* input_line_pointer != ' ');
- return (expressionP->X_seg);
-} /* 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.
- * 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;
- * Unused fields zeroed to help expr().
- */
+/* Parse an MRI multi character constant. */
static void
- clean_up_expression (expressionP)
-register expressionS * expressionP;
+mri_char_constant (expressionP)
+ expressionS *expressionP;
{
- switch (expressionP->X_seg)
+ int i;
+
+ if (*input_line_pointer == '\''
+ && input_line_pointer[1] != '\'')
{
- case SEG_ABSENT:
- case SEG_PASS1:
- expressionP->X_add_symbol = NULL;
- expressionP->X_subtract_symbol = NULL;
- expressionP->X_add_number = 0;
- break;
-
- case SEG_BIG:
- case SEG_ABSOLUTE:
- expressionP->X_subtract_symbol = NULL;
- expressionP->X_add_symbol = NULL;
- break;
-
- case SEG_UNKNOWN:
- expressionP->X_subtract_symbol = NULL;
- break;
-
- case SEG_DIFFERENCE:
- /*
- * 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) == S_GET_VALUE(expressionP->X_add_symbol))) {
- expressionP->X_subtract_symbol = NULL;
- expressionP->X_add_symbol = NULL;
- expressionP->X_seg = SEG_ABSOLUTE;
- }
- break;
-
- case SEG_REGISTER:
- expressionP->X_add_symbol = NULL;
- expressionP->X_subtract_symbol = NULL;
- break;
-
- default:
- if (SEG_NORMAL(expressionP->X_seg)) {
- expressionP->X_subtract_symbol = NULL;
+ expressionP->X_op = O_constant;
+ expressionP->X_add_number = 0;
+ return;
+ }
+
+ /* 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;
+
+ 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;
}
- else {
- BAD_CASE (expressionP->X_seg);
+
+ 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;
}
+
+ if (*input_line_pointer == '\''
+ && input_line_pointer[1] != '\'')
break;
}
-} /* clean_up_expression() */
-\f
-/*
- * expr_part ()
- *
- * Internal. Made a function because this code is used in 2 places.
- * Generate error or correct X_?????_symbol of expressionS.
- */
+
+ if (i < 0)
+ {
+ as_bad ("Character constant too large");
+ i = 0;
+ }
+
+ 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
+ {
+ 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));
+ }
+
+ /* Skip the final closing quote. */
+ ++input_line_pointer;
+}
/*
- * symbol_1 += symbol_2 ... well ... sort of.
+ * Summary of operand().
+ *
+ * in: Input_line_pointer points to 1st char of operand, which may
+ * be a space.
+ *
+ * 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.
*/
static segT
- expr_part (symbol_1_PP, symbol_2_P)
-symbolS ** symbol_1_PP;
-symbolS * symbol_2_P;
+operand (expressionP)
+ expressionS *expressionP;
{
- segT return_value;
-#ifndef MANY_SEGMENTS
- know((* symbol_1_PP) == NULL || (S_GET_SEGMENT(*symbol_1_PP) == SEG_TEXT) || (S_GET_SEGMENT(*symbol_1_PP) == SEG_DATA) || (S_GET_SEGMENT(*symbol_1_PP) == SEG_BSS) || (!S_IS_DEFINED(* symbol_1_PP)));
- know(symbol_2_P == NULL || (S_GET_SEGMENT(symbol_2_P) == SEG_TEXT) || (S_GET_SEGMENT(symbol_2_P) == SEG_DATA) || (S_GET_SEGMENT(symbol_2_P) == SEG_BSS) || (!S_IS_DEFINED(symbol_2_P)));
-#endif
- if (* symbol_1_PP)
+ 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. */
+
+ SKIP_WHITESPACE (); /* leading whitespace is part of operand. */
+ c = *input_line_pointer++; /* input_line_pointer->past char in c. */
+
+ switch (c)
{
- if (!S_IS_DEFINED(* symbol_1_PP))
+ case '1':
+ case '2':
+ case '3':
+ case '4':
+ case '5':
+ case '6':
+ case '7':
+ case '8':
+ case '9':
+ input_line_pointer--;
+
+ integer_constant (flag_mri ? 0 : 10, expressionP);
+ break;
+
+ case '0':
+ /* non-decimal radix */
+
+ if (flag_mri)
{
- if (symbol_2_P)
- {
- return_value = SEG_PASS1;
- * symbol_1_PP = NULL;
- }
- else
+ char *s;
+
+ /* Check for a hex constant. */
+ for (s = input_line_pointer; hex_p (*s); s++)
+ ;
+ if (*s == 'h' || *s == 'H')
{
- know(!S_IS_DEFINED(* symbol_1_PP));
- return_value = SEG_UNKNOWN;
+ --input_line_pointer;
+ integer_constant (0, expressionP);
+ break;
}
}
- else
+
+ c = *input_line_pointer;
+ switch (c)
{
- if (symbol_2_P)
+ case '8':
+ case '9':
+ if (flag_mri)
{
- if (!S_IS_DEFINED(symbol_2_P))
- {
- * symbol_1_PP = NULL;
- return_value = SEG_PASS1;
- }
- else
+ 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_op = O_constant;
+ expressionP->X_add_number = 0;
+ }
+
+ break;
+
+ case 'x':
+ case 'X':
+ if (flag_mri)
+ goto default_case;
+ input_line_pointer++;
+ integer_constant (16, expressionP);
+ break;
+
+ case 'b':
+ if (LOCAL_LABELS_FB)
+ {
+ switch (input_line_pointer[1])
{
- /* {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 = SEG_ABSOLUTE;
+ 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:
+ ;
}
- else
+ case 'B':
+ input_line_pointer++;
+ if (flag_mri)
+ goto default_case;
+ integer_constant (2, expressionP);
+ break;
+
+ case '0':
+ case '1':
+ case '2':
+ case '3':
+ case '4':
+ case '5':
+ case '6':
+ case '7':
+ integer_constant (flag_mri ? 0 : 8, expressionP);
+ break;
+
+ case 'f':
+ if (LOCAL_LABELS_FB)
+ {
+ /* 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 */
+ ;
+ }
+
+ case 'd':
+ case 'D':
+ case 'F':
+ case 'r':
+ case 'e':
+ case 'E':
+ case 'g':
+ case 'G':
+ input_line_pointer++;
+ floating_constant (expressionP);
+ expressionP->X_add_number = -(isupper (c) ? tolower (c) : c);
+ break;
+
+ case '$':
+ if (LOCAL_LABELS_DOLLAR)
{
- return_value = S_GET_SEGMENT(* symbol_1_PP);
+ integer_constant (10, expressionP);
+ break;
}
+ else
+ goto default_case;
}
- }
- else
- { /* (* symbol_1_PP) == NULL */
- if (symbol_2_P)
+
+ break;
+
+ case '(':
+ case '[':
+ /* didn't begin with digit & not a name */
+ 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 '\'':
+ if (! flag_mri)
{
- * symbol_1_PP = symbol_2_P;
- return_value = S_GET_SEGMENT(symbol_2_P);
+ /* 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 '+':
+ (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 '-':
+ {
+ operand (expressionP);
+ if (expressionP->X_op == O_constant)
+ {
+ /* input_line_pointer -> char after operand */
+ if (c == '-')
+ {
+ 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;
+ }
+ else if (expressionP->X_op != O_illegal
+ && expressionP->X_op != O_absent)
+ {
+ expressionP->X_add_symbol = make_expr_symbol (expressionP);
+ if (c == '-')
+ expressionP->X_op = O_uminus;
+ else
+ expressionP->X_op = O_bit_not;
+ expressionP->X_add_number = 0;
+ }
else
+ 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;
+ }
+ /* Fall through. */
+ case '.':
+ if (!is_part_of_name (*input_line_pointer))
+ {
+ const char *fake;
+
+ /* JF: '.' is pseudo symbol with value of current location
+ in current segment. */
+ fake = FAKE_LABEL_NAME;
+ symbolP = symbol_new (fake,
+ now_seg,
+ (valueT) frag_now_fix (),
+ frag_now);
+
+ expressionP->X_op = O_symbol;
+ expressionP->X_add_symbol = symbolP;
+ expressionP->X_add_number = 0;
+ 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
{
- * symbol_1_PP = NULL;
- return_value = SEG_ABSOLUTE;
+ goto isname;
}
+ case ',':
+ case '\n':
+ case '\0':
+ eol:
+ /* can't imagine any other kind of operand */
+ expressionP->X_op = O_absent;
+ input_line_pointer--;
+ 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;
+
+ default:
+ 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 */
+ {
+ /*
+ * Identifier begins here.
+ * This is kludged for speed, so code is repeated.
+ */
+ isname:
+ 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. */
+ 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_op = O_symbol;
+ expressionP->X_add_symbol = symbolP;
+ expressionP->X_add_number = 0;
+ }
+ *input_line_pointer = c;
+ }
+ else
+ {
+ /* 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;
}
-#ifndef MANY_SEGMENTS
- know(return_value == SEG_ABSOLUTE || return_value == SEG_TEXT || return_value == SEG_DATA || return_value == SEG_BSS || return_value == SEG_UNKNOWN || return_value == SEG_PASS1);
-#endif
- know((*symbol_1_PP) == NULL || (S_GET_SEGMENT(*symbol_1_PP) == return_value));
- return (return_value);
-} /* expr_part() */
+
+ /*
+ * It is more 'efficient' to clean up the expressionS when they are created.
+ * Doing it here saves lines of code.
+ */
+ clean_up_expression (expressionP);
+ SKIP_WHITESPACE (); /*->1st char after operand. */
+ know (*input_line_pointer != ' ');
+
+ /* 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_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_op from O_subtract to O_constant.
+ * Unused fields zeroed to help expr().
+ */
+
+static void
+clean_up_expression (expressionP)
+ expressionS *expressionP;
+{
+ switch (expressionP->X_op)
+ {
+ case O_illegal:
+ case O_absent:
+ expressionP->X_add_number = 0;
+ /* Fall through. */
+ case O_big:
+ case O_constant:
+ case O_register:
+ expressionP->X_add_symbol = NULL;
+ /* 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))))
+ {
+ addressT diff = (S_GET_VALUE (expressionP->X_add_symbol)
+ - S_GET_VALUE (expressionP->X_op_symbol));
+
+ expressionP->X_op = O_constant;
+ expressionP->X_add_symbol = NULL;
+ expressionP->X_op_symbol = NULL;
+ expressionP->X_add_number += diff;
+ }
+ break;
+ default:
+ break;
+ }
+}
\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] = { /* 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_bit_exclusive_or, __,
- __, __, __, __, __, __, __, __,
- __, __, __, __, __, __, __, __,
- __, __, __, __, __, __, __, __,
- __, __, __, __, O_bit_inclusive_or, __, __, __,
-
- __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,
- __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,
- __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,
- __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,
- __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,
- __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,
- __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,
- __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __
- };
+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_lt, __, O_gt, __,
+ __, __, __, __, __, __, __, __,
+ __, __, __, __, __, __, __, __,
+ __, __, __, __, __, __, __, __,
+ __, __, __, __, __, __, O_bit_exclusive_or, __,
+ __, __, __, __, __, __, __, __,
+ __, __, __, __, __, __, __, __,
+ __, __, __, __, __, __, __, __,
+ __, __, __, __, O_bit_inclusive_or, __, __, __,
+
+ __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,
+ __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,
+ __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,
+ __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,
+ __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,
+ __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,
+ __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,
+ __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __
+};
/*
* 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 expr(rank, resultP)
- register operator_rankT rank; /* Larger # is higher rank. */
- register expressionS *resultP; /* Deliver result here. */
+/* 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 ()
{
- expressionS right;
- register operatorT op_left;
- register char c_left; /* 1st operator character. */
- register operatorT op_right;
- register char c_right;
-
- know(rank >= 0);
- (void)operand (resultP);
- know(* input_line_pointer != ' '); /* Operand() gobbles spaces. */
- c_left = * input_line_pointer; /* Potential operator character. */
- op_left = op_encoding [c_left];
- while (op_left != O_illegal && op_rank [(int) op_left] > rank)
+ int c;
+ operatorT ret;
+
+ c = *input_line_pointer;
+
+ switch (c)
{
- 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 (SEG_ABSENT == expr (op_rank[(int) op_left], &right))
- {
- 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 = SEG_ABSOLUTE;
- }
- 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 == '>'))
- {
- input_line_pointer ++;
- } /*->after operator. */
- know((int) op_right == 0 || op_rank [(int) op_right] <= op_rank[(int) op_left]);
- /* 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 == SEG_PASS1 || right . X_seg == SEG_PASS1)
- {
- resultP->X_seg = SEG_PASS1;
+ 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;
}
- else
+ ++input_line_pointer;
+ return ret;
+
+ case '>':
+ switch (input_line_pointer[1])
{
- if (resultP->X_seg == SEG_BIG)
- {
- as_warn("Left operand of %c is a %s. Integer 0 assumed.",
- c_left, resultP->X_add_number > 0 ? "bignum" : "float");
- resultP->X_seg = SEG_ABSOLUTE;
- resultP->X_add_symbol = 0;
- resultP->X_subtract_symbol = 0;
- resultP->X_add_number = 0;
- }
- if (right . X_seg == SEG_BIG)
- {
- as_warn("Right operand of %c is a %s. Integer 0 assumed.",
- c_left, right . X_add_number > 0 ? "bignum" : "float");
- right . X_seg = SEG_ABSOLUTE;
- right . X_add_symbol = 0;
- right . X_subtract_symbol = 0;
- right . X_add_number = 0;
- }
- if (op_left == O_subtract)
+ 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;
+ operatorT op_right;
+
+ know (rank >= 0);
+
+ retval = operand (resultP);
+
+ know (*input_line_pointer != ' '); /* Operand() gobbles spaces. */
+
+ op_left = operator ();
+ while (op_left != O_illegal && op_rank[(int) op_left] > rank)
+ {
+ segT rightseg;
+
+ input_line_pointer++; /*->after 1st character of operator. */
+
+ rightseg = expr (op_rank[(int) op_left], &right);
+ if (right.X_op == O_absent)
+ {
+ 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 != ' ');
+
+ if (retval == undefined_section)
+ {
+ 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_subtract);
+
+ /* input_line_pointer->after right-hand quantity. */
+ /* left-hand quantity in resultP */
+ /* right-hand quantity in right. */
+ /* operator in op_left. */
+
+ if (resultP->X_op == O_big)
+ {
+ 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;
+ }
+ if (right.X_op == O_big)
+ {
+ 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))
{
- /*
- * 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.
- */
-
- register 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 = SEG_DIFFERENCE;
- }
- op_left = O_add;
+ as_warn ("division by zero");
+ v = 1;
}
- \f
- if (op_left == O_add)
+ switch (op_left)
{
- segT seg1;
- segT seg2;
-#ifndef MANY_SEGMENTS
- know(resultP->X_seg == SEG_DATA || resultP->X_seg == SEG_TEXT || resultP->X_seg == SEG_BSS || resultP->X_seg == SEG_UNKNOWN || resultP->X_seg == SEG_DIFFERENCE || resultP->X_seg == SEG_ABSOLUTE || resultP->X_seg == SEG_PASS1);
- know(right.X_seg == SEG_DATA || right.X_seg == SEG_TEXT || right.X_seg == SEG_BSS || right.X_seg == SEG_UNKNOWN || right.X_seg == SEG_DIFFERENCE || right.X_seg == SEG_ABSOLUTE || right.X_seg == SEG_PASS1);
-#endif
- 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 == SEG_PASS1 || seg2 == SEG_PASS1) {
- need_pass_2 = 1;
- resultP->X_seg = SEG_PASS1;
- } else if (seg2 == SEG_ABSOLUTE)
- resultP->X_seg = seg1;
- else if (seg1 != SEG_UNKNOWN
- && seg1 != SEG_ABSOLUTE
- && seg2 != SEG_UNKNOWN
- && seg1 != seg2) {
- know(seg2 != SEG_ABSOLUTE);
- know(resultP->X_subtract_symbol);
-#ifndef MANY_SEGMENTS
- know(seg1 == SEG_TEXT || seg1 == SEG_DATA || seg1== SEG_BSS);
- know(seg2 == SEG_TEXT || seg2 == SEG_DATA || seg2== SEG_BSS);
-#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 = SEG_ABSOLUTE;
- /* Clean_up_expression() will do the rest. */
- } else
- resultP->X_seg = SEG_DIFFERENCE;
-
- resultP->X_add_number += right . X_add_number;
- clean_up_expression (resultP);
+ 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;
}
- else
- { /* Not +. */
- if (resultP->X_seg == SEG_UNKNOWN || right . X_seg == SEG_UNKNOWN)
- {
- resultP->X_seg = SEG_PASS1;
- need_pass_2 = 1;
- }
- else
- {
- resultP->X_subtract_symbol = NULL;
- resultP->X_add_symbol = NULL;
- /* Will be SEG_ABSOLUTE. */
- if (resultP->X_seg != SEG_ABSOLUTE || right . X_seg != SEG_ABSOLUTE)
- {
- as_bad("Relocation error. Absolute 0 assumed.");
- resultP->X_seg = SEG_ABSOLUTE;
- 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. 0 assumed.");
- 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:
- 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;
+ }
+ 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)
+ 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;
+ }
+
+ 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
/*
* lines end in end-of-line.
*/
char
- get_symbol_end()
+get_symbol_end ()
{
- register char c;
-
- while (is_part_of_name(c = * input_line_pointer ++))
- ;
- * -- input_line_pointer = 0;
- return (c);
+ char c;
+
+ /* 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 get_single_number()
+unsigned int
+get_single_number ()
{
- expressionS exp;
- operand(&exp);
- return exp.X_add_number;
-
+ expressionS exp;
+ operand (&exp);
+ return exp.X_add_number;
+
}
-/*
- * Local Variables:
- * comment-column: 0
- * fill-column: 131
- * End:
- */
/* end of expr.c */
projects / binutils-gdb.git / blobdiff