/* expr.c -operands, expressions-
- Copyright (C) 1987, 1990, 1991, 1992 Free Software Foundation, Inc.
-
+ Copyright 1987, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
+ 1999, 2000, 2001, 2002
+ 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. */
+ along with GAS; see the file COPYING. If not, write to 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
- * distinguish the world of expressions from the world of statements.
- * (It also gives smaller files to re-compile.)
- * Here, "operand"s are of expressions, not instructions.
- */
+/* This is really a branch office of as-read.c. I split it out to clearly
+ distinguish the world of expressions from the world of statements.
+ (It also gives smaller files to re-compile.)
+ Here, "operand"s are of expressions, not instructions. */
-#include <ctype.h>
#include <string.h>
+#define min(a, b) ((a) < (b) ? (a) : (b))
#include "as.h"
-
+#include "safe-ctype.h"
#include "obstack.h"
-#if __STDC__ == 1
-static void clean_up_expression(expressionS *expressionP);
-#else /* __STDC__ */
-static void clean_up_expression(); /* Internal. */
-#endif /* not __STDC__ */
-extern const char EXP_CHARS[]; /* JF hide MD floating pt stuff all the same place */
-extern const char FLT_CHARS[];
-
-#ifdef LOCAL_LABELS_DOLLAR
-extern int local_label_defined[];
+static void floating_constant (expressionS * expressionP);
+static valueT generic_bignum_to_int32 (void);
+#ifdef BFD64
+static valueT generic_bignum_to_int64 (void);
#endif
-
-/*
- * 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 =
-{
- & 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;
+static void integer_constant (int radix, expressionS * expressionP);
+static void mri_char_constant (expressionS *);
+static void current_location (expressionS *);
+static void clean_up_expression (expressionS * expressionP);
+static segT operand (expressionS *);
+static operatorT operator (int *);
+
+extern const char EXP_CHARS[], FLT_CHARS[];
+
+/* We keep a mapping of expression symbols to file positions, so that
+ we can provide better error messages. */
+
+struct expr_symbol_line {
+ struct expr_symbol_line *next;
+ symbolS *sym;
+ char *file;
+ unsigned int line;
+};
+
+static struct expr_symbol_line *expr_symbol_lines;
\f
-floating_constant(expressionP)
-expressionS *expressionP;
+/* 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 (expressionS *expressionP)
{
- /* input_line_pointer->*/
- /* floating-point constant. */
- int error_code;
+ expressionS zero;
+ symbolS *symbolP;
+ struct expr_symbol_line *n;
- error_code = atof_generic
- (& input_line_pointer, ".", EXP_CHARS,
- & generic_floating_point_number);
+ if (expressionP->X_op == O_symbol
+ && expressionP->X_add_number == 0)
+ return expressionP->X_add_symbol;
- if (error_code)
- {
- if (error_code == ERROR_EXPONENT_OVERFLOW)
- {
- as_bad("bad floating-point constant: exponent overflow, probably assembling junk");
- }
- else
+ if (expressionP->X_op == O_big)
{
- as_bad("bad floating-point constant: unknown error code=%d.", error_code);
+ /* This won't work, because the actual value is stored in
+ generic_floating_point_number or generic_bignum, and we are
+ going to lose it if we haven't already. */
+ if (expressionP->X_add_number > 0)
+ as_bad (_("bignum invalid"));
+ else
+ as_bad (_("floating point number invalid"));
+ zero.X_op = O_constant;
+ zero.X_add_number = 0;
+ zero.X_unsigned = 0;
+ clean_up_expression (&zero);
+ expressionP = &zero;
}
- }
- expressionP->X_seg = SEG_BIG;
- /* input_line_pointer->just after constant, */
- /* which may point to whitespace. */
- expressionP->X_add_number =-1;
+ /* 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_LABEL_NAME,
+ (expressionP->X_op == O_constant
+ ? absolute_section
+ : expr_section),
+ 0, &zero_address_frag);
+ symbol_set_value_expression (symbolP, expressionP);
+
+ if (expressionP->X_op == O_constant)
+ resolve_symbol_value (symbolP);
+
+ n = (struct expr_symbol_line *) xmalloc (sizeof *n);
+ n->sym = symbolP;
+ as_where (&n->file, &n->line);
+ n->next = expr_symbol_lines;
+ expr_symbol_lines = n;
+
+ return symbolP;
}
+/* Return the file and line number for an expr symbol. Return
+ non-zero if something was found, 0 if no information is known for
+ the symbol. */
-
-integer_constant(radix, expressionP)
-int radix;
-expressionS *expressionP;
-
-
+int
+expr_symbol_where (symbolS *sym, char **pfile, unsigned int *pline)
{
- register char * digit_2; /*->2nd digit of number. */
- char c;
-
- register valueT number; /* offset or (absolute) value */
- register short int digit; /* value of next digit in current radix */
- register short int maxdig = 0; /* highest permitted digit value. */
- register int too_many_digits = 0; /* if we see >= this number of */
- register char *name; /* points to name of symbol */
- register symbolS * symbolP; /* points to symbol */
-
- int small; /* true if fits in 32 bits. */
- extern 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.
- * 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.
- */
-
- switch (radix)
- {
-
- case 2:
- maxdig = 2;
- too_many_digits = 33;
- break;
- case 8:
- maxdig = radix = 8;
- too_many_digits = 11;
- break;
- case 16:
-
-
- maxdig = radix = 16;
- too_many_digits = 9;
- break;
- case 10:
- maxdig = radix = 10;
- too_many_digits = 11;
- }
- c = *input_line_pointer;
- input_line_pointer++;
- digit_2 = 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;
- 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;
- /* 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;
+ register struct expr_symbol_line *l;
- 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
+ for (l = expr_symbol_lines; l != NULL; l = l->next)
{
- number = leader - generic_bignum + 1; /* number of littlenums in the bignum. */
- }
- }
- 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 (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
- )
+ if (l->sym == sym)
{
- /*
- * 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;
+ *pfile = l->file;
+ *pline = l->line;
+ return 1;
}
- 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) */
- }
- else
- {
- expressionP->X_add_number = number;
- expressionP->X_seg = SEG_BIG;
- input_line_pointer --; /*->char following number. */
- } /* if (small) */
-}
-
-
-/*
- * 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.
- *
- */
+
+ return 0;
+}
\f
+/* Utilities for building expressions.
+ Since complex expressions are recorded as symbols for use in other
+ expressions these return a symbolS * and not an expressionS *.
+ These explicitly do not take an "add_number" argument. */
+/* ??? For completeness' sake one might want expr_build_symbol.
+ It would just return its argument. */
+
+/* Build an expression for an unsigned constant.
+ The corresponding one for signed constants is missing because
+ there's currently no need for it. One could add an unsigned_p flag
+ but that seems more clumsy. */
+
+symbolS *
+expr_build_uconstant (offsetT value)
+{
+ expressionS e;
+
+ e.X_op = O_constant;
+ e.X_add_number = value;
+ e.X_unsigned = 1;
+ return make_expr_symbol (&e);
+}
+/* Build an expression for OP s1. */
-static segT
-operand (expressionP)
- register expressionS * expressionP;
+symbolS *
+expr_build_unary (operatorT op, symbolS *s1)
{
- register char c;
- register symbolS * symbolP; /* points to symbol */
- register char *name; /* points to name of symbol */
- /* invented for humans only, hope */
- /* optimising compiler flushes it! */
- register short int radix; /* 2, 8, 10 or 16, 0 when floating */
- /* 0 means we saw start of a floating- */
- /* point constant. */
+ expressionS e;
- /* digits, assume it is a bignum. */
+ e.X_op = op;
+ e.X_add_symbol = s1;
+ e.X_add_number = 0;
+ return make_expr_symbol (&e);
+}
+/* Build an expression for s1 OP s2. */
+symbolS *
+expr_build_binary (operatorT op, symbolS *s1, symbolS *s2)
+{
+ expressionS e;
+ e.X_op = op;
+ e.X_add_symbol = s1;
+ e.X_op_symbol = s2;
+ e.X_add_number = 0;
+ return make_expr_symbol (&e);
+}
- SKIP_WHITESPACE(); /* leading whitespace is part of operand. */
- c = * input_line_pointer ++; /* input_line_pointer->past char in c. */
+/* Build an expression for the current location ('.'). */
- 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 '4':
- case '5':
- case '6':
- case '7':
- case '8':
- case '9':
- input_line_pointer--;
-
- integer_constant(10, expressionP);
- break;
-
- case '0':
- /* non-decimal radix */
-
-
- c = *input_line_pointer;
- switch (c)
- {
+symbolS *
+expr_build_dot (void)
+{
+ expressionS e;
- default:
- /* The string was only zero */
- expressionP->X_add_symbol = 0;
- expressionP->X_add_number = 0;
- expressionP->X_seg = SEG_ABSOLUTE;
- break;
-
- case 'x':
- case 'X':
- input_line_pointer++;
- integer_constant(16, expressionP);
- break;
- case 'B':
- case 'b':
- input_line_pointer++;
- integer_constant(2, expressionP);
- break;
+ current_location (&e);
+ return make_expr_symbol (&e);
+}
+\f
+/* Build any floating-point literal here.
+ Also build any bignum literal here. */
- case '1':
- case '2':
- case '3':
- case '4':
- case '5':
- case '6':
- case '7':
- integer_constant(8, expressionP);
- break;
+/* 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 = {
+ &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
+static void
+floating_constant (expressionS *expressionP)
+{
+ /* input_line_pointer -> floating-point constant. */
+ int error_code;
- case 'f':
- /* 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))))
- {
- input_line_pointer -= 2;
- integer_constant(10, expressionP);
- break;
- }
+ error_code = atof_generic (&input_line_pointer, ".", EXP_CHARS,
+ &generic_floating_point_number);
- case 'd':
- case 'D':
- case 'F':
-
- case 'e':
- case 'E':
- case 'g':
- case 'G':
-
- input_line_pointer++;
- floating_constant(expressionP);
- break;
- }
-
- break;
- case '(':
- /* didn't begin with digit & not a name */
- {
- (void)expression(expressionP);
- /* Expression() will pass trailing whitespace */
- if (* input_line_pointer ++ != ')')
+ if (error_code)
{
- as_bad("Missing ')' assumed");
- input_line_pointer --;
+ if (error_code == ERROR_EXPONENT_OVERFLOW)
+ {
+ as_bad (_("bad floating-point constant: exponent overflow"));
+ }
+ else
+ {
+ as_bad (_("bad floating-point constant: unknown error code=%d"),
+ error_code);
+ }
}
- /* here with input_line_pointer->char after "(...)" */
- }
- return;
+ expressionP->X_op = O_big;
+ /* input_line_pointer -> just after constant, which may point to
+ whitespace. */
+ expressionP->X_add_number = -1;
+}
+static valueT
+generic_bignum_to_int32 (void)
+{
+ valueT number =
+ ((generic_bignum[1] & LITTLENUM_MASK) << LITTLENUM_NUMBER_OF_BITS)
+ | (generic_bignum[0] & LITTLENUM_MASK);
+ number &= 0xffffffff;
+ return number;
+}
+
+#ifdef BFD64
+static valueT
+generic_bignum_to_int64 (void)
+{
+ valueT number =
+ ((((((((valueT) generic_bignum[3] & LITTLENUM_MASK)
+ << LITTLENUM_NUMBER_OF_BITS)
+ | ((valueT) generic_bignum[2] & LITTLENUM_MASK))
+ << LITTLENUM_NUMBER_OF_BITS)
+ | ((valueT) generic_bignum[1] & LITTLENUM_MASK))
+ << LITTLENUM_NUMBER_OF_BITS)
+ | ((valueT) generic_bignum[0] & LITTLENUM_MASK));
+ return number;
+}
+#endif
+
+static void
+integer_constant (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
- 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 = SEG_ABSOLUTE;
- break;
+ if ((NUMBERS_WITH_SUFFIX || flag_m68k_mri) && radix == 0)
+ {
+ int flt = 0;
- case '~':
- case '-':
- case '+':
+ /* 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;
+ }
- {
- /* unary operator: hope for SEG_ABSOLUTE */
- switch(operand (expressionP)) {
- case SEG_ABSOLUTE:
- /* input_line_pointer -> char after operand */
- if ( c=='-' )
+ if (suffix == input_line_pointer)
{
- expressionP -> X_add_number = - expressionP -> X_add_number;
- /*
- * Notice: '-' may overflow: no warning is given. This is compatible
- * with other people's assemblers. Sigh.
- */
+ radix = 10;
+ suffix = NULL;
}
- else
+ else
{
- expressionP -> X_add_number = ~ expressionP -> X_add_number;
+ c = *--suffix;
+ 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;
+ }
}
- break;
-
- case SEG_TEXT:
- case SEG_DATA:
- case SEG_BSS:
- 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;
- }
- default: /* unary on non-absolute is unsuported */
- as_warn("Unary operator %c ignored because bad operand follows", c);
- break;
- /* Expression undisturbed from operand(). */
- }
- }
-
-
-
- break;
+ }
- case '.':
- if( !is_part_of_name(*input_line_pointer))
+ switch (radix)
{
- 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;
+ 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 + 11) / 4; /* Very rough. */
}
- else
+#undef valuesize
+ start = input_line_pointer;
+ c = *input_line_pointer++;
+ for (number = 0;
+ (digit = hex_value (c)) < maxdig;
+ c = *input_line_pointer++)
{
- goto isname;
-
-
+ number = number * radix + digit;
}
-
- case '\n':
- /* can't imagine any other kind of operand */
- expressionP->X_seg = SEG_ABSENT;
- input_line_pointer --;
- md_operand (expressionP);
- break;
- /* Fall through */
- default:
- 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.
- */
- 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;
+ /* c contains character after number. */
+ /* input_line_pointer->char after c. */
+ small = (input_line_pointer - start - 1) < too_many_digits;
- default:
- expressionP->X_add_number = 0;
- expressionP->X_add_symbol = symbolP;
- }
- * input_line_pointer = c;
- expressionP->X_subtract_symbol = NULL;
- }
- else
+ if (radix == 16 && c == '_')
{
- as_bad("Bad expression");
- expressionP->X_add_number = 0;
- expressionP->X_seg = SEG_ABSOLUTE;
+ /* This is literal of the form 0x333_0_12345678_1.
+ This example is equivalent to 0x00000333000000001234567800000001. */
- }
-
- }
-
-
-
+ int num_little_digits = 0;
+ int i;
+ input_line_pointer = start; /* -> 1st digit. */
+ know (LITTLENUM_NUMBER_OF_BITS == 16);
-
+ for (c = '_'; c == '_'; num_little_digits += 2)
+ {
- /*
- * 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() */
+ /* Convert one 64-bit word. */
+ int ndigit = 0;
+ number = 0;
+ for (c = *input_line_pointer++;
+ (digit = hex_value (c)) < maxdig;
+ c = *(input_line_pointer++))
+ {
+ number = number * radix + digit;
+ ndigit++;
+ }
-\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().
- */
+ /* Check for 8 digit per word max. */
+ if (ndigit > 8)
+ as_bad (_("a bignum with underscores may not have more than 8 hex digits in any word"));
+
+ /* Add this chunk to the bignum.
+ Shift things down 2 little digits. */
+ know (LITTLENUM_NUMBER_OF_BITS == 16);
+ for (i = min (num_little_digits + 1, SIZE_OF_LARGE_NUMBER - 1);
+ i >= 2;
+ i--)
+ generic_bignum[i] = generic_bignum[i - 2];
+
+ /* Add the new digits as the least significant new ones. */
+ generic_bignum[0] = number & 0xffffffff;
+ generic_bignum[1] = number >> 16;
+ }
-static void
-clean_up_expression (expressionP)
- register expressionS * expressionP;
-{
- switch (expressionP->X_seg)
- {
- case SEG_ABSENT:
- case SEG_PASS1:
- expressionP->X_add_symbol = NULL;
- expressionP->X_subtract_symbol = NULL;
- expressionP->X_add_number = 0;
- break;
+ /* Again, c is char after number, input_line_pointer->after c. */
- case SEG_BIG:
- case SEG_ABSOLUTE:
- expressionP->X_subtract_symbol = NULL;
- expressionP->X_add_symbol = NULL;
- break;
+ if (num_little_digits > SIZE_OF_LARGE_NUMBER - 1)
+ num_little_digits = SIZE_OF_LARGE_NUMBER - 1;
- case SEG_UNKNOWN:
- expressionP->X_subtract_symbol = NULL;
- break;
+ assert (num_little_digits >= 4);
- 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;
+ if (num_little_digits != 8)
+ as_bad (_("a bignum with underscores must have exactly 4 words"));
- case SEG_REGISTER:
- expressionP->X_add_symbol = NULL;
- expressionP->X_subtract_symbol = NULL;
- break;
+ /* We might have some leading zeros. These can be trimmed to give
+ us a change to fit this constant into a small number. */
+ while (generic_bignum[num_little_digits - 1] == 0
+ && num_little_digits > 1)
+ num_little_digits--;
- default:
- if (SEG_NORMAL(expressionP->X_seg)) {
- expressionP->X_subtract_symbol = NULL;
+ if (num_little_digits <= 2)
+ {
+ /* will fit into 32 bits. */
+ number = generic_bignum_to_int32 ();
+ small = 1;
}
- else {
- BAD_CASE (expressionP->X_seg);
+#ifdef BFD64
+ else if (num_little_digits <= 4)
+ {
+ /* Will fit into 64 bits. */
+ number = generic_bignum_to_int64 ();
+ small = 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.
- */
-
-/*
- * symbol_1 += symbol_2 ... well ... sort of.
- */
-
-static segT
-expr_part (symbol_1_PP, symbol_2_P)
- symbolS ** symbol_1_PP;
- symbolS * symbol_2_P;
-{
- 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)
+ else
+ {
+ small = 0;
+
+ /* Number of littlenums in the bignum. */
+ number = num_little_digits;
+ }
+ }
+ else if (!small)
{
- if (!S_IS_DEFINED(* symbol_1_PP))
+ /* 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;
+ generic_bignum[2] = 0;
+ generic_bignum[3] = 0;
+ input_line_pointer = start; /* -> 1st digit. */
+ c = *input_line_pointer++;
+ for (; (carry = hex_value (c)) < maxdig; c = *input_line_pointer++)
{
- if (symbol_2_P)
- {
- return_value = SEG_PASS1;
- * symbol_1_PP = NULL;
- }
- else
+ for (pointer = generic_bignum; pointer <= leader; pointer++)
{
- know(!S_IS_DEFINED(* symbol_1_PP));
- return_value = SEG_UNKNOWN;
+ long work;
+
+ work = carry + radix * *pointer;
+ *pointer = work & LITTLENUM_MASK;
+ carry = work >> LITTLENUM_NUMBER_OF_BITS;
}
- }
- else
- {
- if (symbol_2_P)
+ if (carry)
{
- if (!S_IS_DEFINED(symbol_2_P))
- {
- * symbol_1_PP = NULL;
- return_value = SEG_PASS1;
- }
- else
+ if (leader < generic_bignum + SIZE_OF_LARGE_NUMBER - 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;
+ /* Room to grow a longer bignum. */
+ *++leader = carry;
}
}
- else
- {
- return_value = S_GET_SEGMENT(* symbol_1_PP);
- }
}
- }
- else
- { /* (* symbol_1_PP) == NULL */
- if (symbol_2_P)
+ /* Again, c is char after number. */
+ /* input_line_pointer -> after c. */
+ know (LITTLENUM_NUMBER_OF_BITS == 16);
+ if (leader < generic_bignum + 2)
{
- * symbol_1_PP = symbol_2_P;
- return_value = S_GET_SEGMENT(symbol_2_P);
+ /* Will fit into 32 bits. */
+ number = generic_bignum_to_int32 ();
+ small = 1;
}
- else
+#ifdef BFD64
+ else if (leader < generic_bignum + 4)
{
- * symbol_1_PP = NULL;
- return_value = SEG_ABSOLUTE;
+ /* Will fit into 64 bits. */
+ number = generic_bignum_to_int64 ();
+ small = 1;
}
- }
-#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() */
-\f
-/* Expression parser. */
-
-/*
- * We allow an empty expression, and just assume (absolute,0) silently.
- * Unary operators and parenthetical expressions are treated as operands.
- * As usual, Q==quantity==operand, O==operator, X==expression mnemonics.
- *
- * We used to do a aho/ullman shift-reduce parser, but the logic got so
- * warped that I flushed it and wrote a recursive-descent parser instead.
- * Now things are stable, would anybody like to write a fast parser?
- * Most expressions are either register (which does not even reach here)
- * or 1 symbol. Then "symbol+constant" and "symbol-symbol" are common.
- * So I guess it doesn't really matter how inefficient more complex expressions
- * are parsed.
- *
- * 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.
- */
-
-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) - */
+ else
+ {
+ /* Number of littlenums in the bignum. */
+ number = leader - generic_bignum + 1;
+ }
}
-operatorT;
-#define __ O_illegal
+ if ((NUMBERS_WITH_SUFFIX || flag_m68k_mri)
+ && suffix != NULL
+ && input_line_pointer - 1 == suffix)
+ c = *input_line_pointer++;
-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, __, __, __,
-
- __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,
- __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,
- __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,
- __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,
- __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,
- __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,
- __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,
- __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __
- };
-
-
-/*
- * Rank Examples
- * 0 operand, (expression)
- * 1 + -
- * 2 & ^ ! |
- * 3 * / % << >>
- */
-static const operator_rankT
-op_rank [] = { 0, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1 };
-\f
-/* Return resultP->X_seg. */
-segT expr(rank, resultP)
-register operator_rankT rank; /* Larger # is higher rank. */
-register expressionS *resultP; /* Deliver result here. */
-{
- 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)
+ if (small)
{
- 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;
- }
- else
+ /* 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')
{
- if (resultP->X_seg == SEG_BIG)
+ /* 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_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;
+ /* 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;
}
- if (right . X_seg == SEG_BIG)
+ else
{
- 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;
+ /* Either not seen or not defined. */
+ /* @@ Should print out the original string instead of
+ the parsed number. */
+ as_bad (_("backward ref to unknown label \"%d:\""),
+ (int) number);
+ expressionP->X_op = O_constant;
}
- if (op_left == O_subtract)
+
+ 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))
{
- /*
- * 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;
+ name = dollar_label_name ((long) number, 0);
+ symbolP = symbol_find (name);
+ know (symbolP != NULL);
}
-\f
- if (op_left == O_add)
+ else
{
- 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);
+ 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
- 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);
- }
- 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
+ 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. */
+ }
+}
+
+/* Parse an MRI multi character constant. */
+
+static void
+mri_char_constant (expressionS *expressionP)
+{
+ int i;
+
+ if (*input_line_pointer == '\''
+ && input_line_pointer[1] != '\'')
+ {
+ 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;
+ }
+
+ 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;
+ }
+
+ 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;
+}
+
+/* Return an expression representing the current location. This
+ handles the magic symbol `.'. */
+
+static void
+current_location (expressionS *expressionp)
+{
+ if (now_seg == absolute_section)
+ {
+ expressionp->X_op = O_constant;
+ expressionp->X_add_number = abs_section_offset;
+ }
+ else
+ {
+ expressionp->X_op = O_symbol;
+ expressionp->X_add_symbol = symbol_temp_new_now ();
+ expressionp->X_add_number = 0;
+ }
+}
+
+/* In: Input_line_pointer points to 1st char of operand, which may
+ be a space.
+
+ Out: An 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
+operand (expressionS *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. */
+
+ SKIP_WHITESPACE (); /* Leading whitespace is part of operand. */
+ c = *input_line_pointer++; /* input_line_pointer -> past char in c. */
+
+ if (is_end_of_line[(unsigned char) c])
+ goto eol;
+
+ switch (c)
+ {
+ case '1':
+ case '2':
+ case '3':
+ case '4':
+ case '5':
+ case '6':
+ case '7':
+ case '8':
+ case '9':
+ input_line_pointer--;
+
+ integer_constant ((NUMBERS_WITH_SUFFIX || flag_m68k_mri)
+ ? 0 : 10,
+ expressionP);
+ break;
+
+#ifdef LITERAL_PREFIXDOLLAR_HEX
+ case '$':
+ /* $L is the start of a local label, not a hex constant. */
+ if (* input_line_pointer == 'L')
+ goto isname;
+ integer_constant (16, expressionP);
+ break;
+#endif
+
+#ifdef LITERAL_PREFIXPERCENT_BIN
+ case '%':
+ integer_constant (2, expressionP);
+ break;
+#endif
+
+ case '0':
+ /* Non-decimal radix. */
+
+ if (NUMBERS_WITH_SUFFIX || flag_m68k_mri)
+ {
+ char *s;
+
+ /* Check for a hex or float constant. */
+ for (s = input_line_pointer; hex_p (*s); s++)
+ ;
+ if (*s == 'h' || *s == 'H' || *input_line_pointer == '.')
+ {
+ --input_line_pointer;
+ integer_constant (0, expressionP);
+ break;
+ }
+ }
+ c = *input_line_pointer;
+ switch (c)
+ {
+ case 'o':
+ case 'O':
+ case 'q':
+ case 'Q':
+ case '8':
+ case '9':
+ if (NUMBERS_WITH_SUFFIX || flag_m68k_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 = - TOLOWER (c);
+ }
+ else
+ {
+ /* The string was only zero. */
+ expressionP->X_op = O_constant;
+ expressionP->X_add_number = 0;
+ }
+
+ break;
+
+ case 'x':
+ case 'X':
+ if (flag_m68k_mri)
+ goto default_case;
+ input_line_pointer++;
+ integer_constant (16, expressionP);
+ break;
+
+ case 'b':
+ if (LOCAL_LABELS_FB && ! (flag_m68k_mri || NUMBERS_WITH_SUFFIX))
+ {
+ /* This code used to check for '+' and '-' here, and, in
+ some conditions, fall through to call
+ integer_constant. However, that didn't make sense,
+ as integer_constant only accepts digits. */
+ /* Some of our code elsewhere does permit digits greater
+ than the expected base; for consistency, do the same
+ here. */
+ if (input_line_pointer[1] < '0'
+ || input_line_pointer[1] > '9')
+ {
+ /* Parse this as a back reference to label 0. */
+ input_line_pointer--;
+ integer_constant (10, expressionP);
+ break;
+ }
+ /* Otherwise, parse this as a binary number. */
+ }
+ /* Fall through. */
+ case 'B':
+ input_line_pointer++;
+ if (flag_m68k_mri || NUMBERS_WITH_SUFFIX)
+ 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_m68k_mri || NUMBERS_WITH_SUFFIX)
+ ? 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]])
+ || strchr (FLT_CHARS, 'f') == NULL)
+ 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 if (cp == input_line_pointer + 1)
+ /* No characters has been accepted -- looks like
+ end of operand. */
+ 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':
+ if (flag_m68k_mri || NUMBERS_WITH_SUFFIX)
+ {
+ integer_constant (0, expressionP);
+ break;
+ }
+ /* Fall through. */
+ case 'F':
+ case 'r':
+ case 'e':
+ case 'E':
+ case 'g':
+ case 'G':
+ input_line_pointer++;
+ floating_constant (expressionP);
+ expressionP->X_add_number = - TOLOWER (c);
+ break;
+
+ case '$':
+ if (LOCAL_LABELS_DOLLAR)
+ {
+ integer_constant (10, expressionP);
+ break;
+ }
+ else
+ goto default_case;
+ }
+
+ break;
+
+ case '(':
+#ifndef NEED_INDEX_OPERATOR
+ case '[':
+#endif
+ /* 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 != ']'))
+ {
+#ifdef RELAX_PAREN_GROUPING
+ if (c != '(')
+#endif
+ as_bad (_("missing '%c'"), c == '(' ? ')' : ']');
+ }
+ else
+ input_line_pointer++;
+ SKIP_WHITESPACE ();
+ /* Here with input_line_pointer -> char after "(...)". */
+ return segment;
+
+#ifdef TC_M68K
+ case 'E':
+ if (! flag_m68k_mri || *input_line_pointer != '\'')
+ goto de_fault;
+ as_bad (_("EBCDIC constants are not supported"));
+ /* Fall through. */
+ case 'A':
+ if (! flag_m68k_mri || *input_line_pointer != '\'')
+ goto de_fault;
+ ++input_line_pointer;
+ /* Fall through. */
+#endif
+ case '\'':
+ if (! flag_m68k_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 '+':
+ /* Do not accept ++e as +(+e).
+ Disabled, since the preprocessor removes whitespace. */
+ if (0 && *input_line_pointer == '+')
+ goto target_op;
+ (void) operand (expressionP);
+ break;
+
+#ifdef TC_M68K
+ case '"':
+ /* Double quote is the bitwise not operator in MRI mode. */
+ if (! flag_m68k_mri)
+ goto de_fault;
+ /* Fall through. */
+#endif
+ case '~':
+ /* '~' is permitted to start a label on the Delta. */
+ if (is_name_beginner (c))
+ goto isname;
+ case '!':
+ case '-':
+ {
+ /* Do not accept --e as -(-e)
+ Disabled, since the preprocessor removes whitespace. */
+ if (0 && c == '-' && *input_line_pointer == '-')
+ goto target_op;
+
+ 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 if (c == '~' || c == '"')
+ expressionP->X_add_number = ~ expressionP->X_add_number;
+ else
+ expressionP->X_add_number = ! expressionP->X_add_number;
+ }
+ else if (expressionP->X_op == O_big
+ && expressionP->X_add_number <= 0
+ && c == '-'
+ && (generic_floating_point_number.sign == '+'
+ || generic_floating_point_number.sign == 'P'))
+ {
+ /* Negative flonum (eg, -1.000e0). */
+ if (generic_floating_point_number.sign == '+')
+ generic_floating_point_number.sign = '-';
+ else
+ generic_floating_point_number.sign = 'N';
+ }
+ else if (expressionP->X_op == O_big
+ && expressionP->X_add_number > 0)
+ {
+ int i;
+
+ if (c == '~' || c == '-')
+ {
+ for (i = 0; i < expressionP->X_add_number; ++i)
+ generic_bignum[i] = ~generic_bignum[i];
+ if (c == '-')
+ for (i = 0; i < expressionP->X_add_number; ++i)
{
- 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) */
+ generic_bignum[i] += 1;
+ if (generic_bignum[i])
+ break;
}
- } /* 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);
+ }
+ else if (c == '!')
+ {
+ int nonzero = 0;
+ for (i = 0; i < expressionP->X_add_number; ++i)
+ {
+ if (generic_bignum[i])
+ nonzero = 1;
+ generic_bignum[i] = 0;
+ }
+ generic_bignum[0] = nonzero;
+ }
+ }
+ 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 if (c == '~' || c == '"')
+ expressionP->X_op = O_bit_not;
+ else
+ expressionP->X_op = O_logical_not;
+ expressionP->X_add_number = 0;
+ }
+ else
+ as_warn (_("Unary operator %c ignored because bad operand follows"),
+ c);
+ }
+ break;
+
+#if defined (DOLLAR_DOT) || defined (TC_M68K)
+ case '$':
+ /* '$' is the program counter when in MRI mode, or when
+ DOLLAR_DOT is defined. */
+#ifndef DOLLAR_DOT
+ if (! flag_m68k_mri)
+ goto de_fault;
+#endif
+ if (flag_m68k_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;
+#endif
+
+ case '.':
+ if (!is_part_of_name (*input_line_pointer))
+ {
+ 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 ',':
+ eol:
+ /* Can't imagine any other kind of operand. */
+ expressionP->X_op = O_absent;
+ input_line_pointer--;
+ break;
+
+#ifdef TC_M68K
+ case '%':
+ if (! flag_m68k_mri)
+ goto de_fault;
+ integer_constant (2, expressionP);
+ break;
+
+ case '@':
+ if (! flag_m68k_mri)
+ goto de_fault;
+ integer_constant (8, expressionP);
+ break;
+
+ case ':':
+ if (! flag_m68k_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_m68k_mri || is_part_of_name (*input_line_pointer))
+ goto de_fault;
+
+ current_location (expressionP);
+ break;
+#endif
+
+ default:
+#ifdef TC_M68K
+ de_fault:
+#endif
+ 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 ();
+
+#ifdef md_parse_name
+ /* This is a hook for the backend to parse certain names
+ specially in certain contexts. If a name always has a
+ specific value, it can often be handled by simply
+ entering it in the symbol table. */
+ if (md_parse_name (name, expressionP, &c))
+ {
+ *input_line_pointer = c;
+ break;
+ }
+#endif
+
+#ifdef TC_I960
+ /* The MRI i960 assembler permits
+ lda sizeof code,g13
+ FIXME: This should use md_parse_name. */
+ if (flag_mri
+ && (strcasecmp (name, "sizeof") == 0
+ || strcasecmp (name, "startof") == 0))
+ {
+ int start;
+ char *buf;
+
+ start = (name[1] == 't'
+ || name[1] == 'T');
+
+ *input_line_pointer = c;
+ 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 ();
+
+ break;
+ }
+#endif
+
+ 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
+ {
+ target_op:
+ /* 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 past 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;
+ }
+
+ /* 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)
+ symbol_mark_used (expressionP->X_add_symbol);
+
+ 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;
+ }
+}
+\f
+/* Internal. Simplify a struct expression for use by expr (). */
+
+/* In: address of an 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:
+ Unused fields zeroed to help expr (). */
+
+static void
+clean_up_expression (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;
+ default:
+ break;
+ }
}
\f
-/*
- * get_symbol_end()
- *
- * This lives here because it belongs equally in expr.c & read.c.
- * Expr.c is just a branch office read.c anyway, and putting it
- * here lessens the crowd at read.c.
- *
- * Assume input_line_pointer is at start of symbol name.
- * Advance input_line_pointer past symbol name.
- * Turn that character into a '\0', returning its former value.
- * This allows a string compare (RMS wants symbol names to be strings)
- * of the symbol name.
- * There will always be a char following symbol name, because all good
- * lines end in end-of-line.
- */
+/* Expression parser. */
+
+/* We allow an empty expression, and just assume (absolute,0) silently.
+ Unary operators and parenthetical expressions are treated as operands.
+ As usual, Q==quantity==operand, O==operator, X==expression mnemonics.
+
+ We used to do an aho/ullman shift-reduce parser, but the logic got so
+ warped that I flushed it and wrote a recursive-descent parser instead.
+ Now things are stable, would anybody like to write a fast parser?
+ Most expressions are either register (which does not even reach here)
+ or 1 symbol. Then "symbol+constant" and "symbol-symbol" are common.
+ So I guess it doesn't really matter how inefficient more complex expressions
+ are parsed.
+
+ 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. */
+
+#undef __
+#define __ O_illegal
+
+/* Maps ASCII -> operators. */
+static const operatorT op_encoding[256] = {
+ __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,
+ __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,
+
+ __, O_bit_or_not, __, __, __, O_modulus, O_bit_and, __,
+ __, __, O_multiply, O_add, __, O_subtract, __, O_divide,
+ __, __, __, __, __, __, __, __,
+ __, __, __, __, O_lt, __, O_gt, __,
+ __, __, __, __, __, __, __, __,
+ __, __, __, __, __, __, __, __,
+ __, __, __, __, __, __, __, __,
+ __, __, __,
+#ifdef NEED_INDEX_OPERATOR
+ O_index,
+#else
+ __,
+#endif
+ __, __, O_bit_exclusive_or, __,
+ __, __, __, __, __, __, __, __,
+ __, __, __, __, __, __, __, __,
+ __, __, __, __, __, __, __, __,
+ __, __, __, __, O_bit_inclusive_or, __, __, __,
+
+ __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,
+ __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,
+ __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,
+ __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,
+ __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,
+ __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,
+ __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,
+ __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __
+};
+
+/* Rank Examples
+ 0 operand, (expression)
+ 1 ||
+ 2 &&
+ 3 == <> < <= >= >
+ 4 + -
+ 5 used for * / % in MRI mode
+ 6 & ^ ! |
+ 7 * / % << >>
+ 8 unary - unary ~
+*/
+static operator_rankT op_rank[] = {
+ 0, /* O_illegal */
+ 0, /* O_absent */
+ 0, /* O_constant */
+ 0, /* O_symbol */
+ 0, /* O_symbol_rva */
+ 0, /* O_register */
+ 0, /* O_big */
+ 9, /* O_uminus */
+ 9, /* O_bit_not */
+ 9, /* O_logical_not */
+ 8, /* O_multiply */
+ 8, /* O_divide */
+ 8, /* O_modulus */
+ 8, /* O_left_shift */
+ 8, /* O_right_shift */
+ 7, /* O_bit_inclusive_or */
+ 7, /* O_bit_or_not */
+ 7, /* O_bit_exclusive_or */
+ 7, /* O_bit_and */
+ 5, /* O_add */
+ 5, /* O_subtract */
+ 4, /* O_eq */
+ 4, /* O_ne */
+ 4, /* O_lt */
+ 4, /* O_le */
+ 4, /* O_ge */
+ 4, /* O_gt */
+ 3, /* O_logical_and */
+ 2, /* O_logical_or */
+ 1, /* O_index */
+ 0, /* O_md1 */
+ 0, /* O_md2 */
+ 0, /* O_md3 */
+ 0, /* O_md4 */
+ 0, /* O_md5 */
+ 0, /* O_md6 */
+ 0, /* O_md7 */
+ 0, /* O_md8 */
+ 0, /* O_md9 */
+ 0, /* O_md10 */
+ 0, /* O_md11 */
+ 0, /* O_md12 */
+ 0, /* O_md13 */
+ 0, /* O_md14 */
+ 0, /* O_md15 */
+ 0, /* O_md16 */
+};
+
+/* Unfortunately, in MRI mode for the m68k, multiplication and
+ division have lower precedence than the bit wise operators. This
+ function sets the operator precedences correctly for the current
+ mode. Also, MRI uses a different bit_not operator, and this fixes
+ that as well. */
+
+#define STANDARD_MUL_PRECEDENCE 8
+#define MRI_MUL_PRECEDENCE 6
+
+void
+expr_set_precedence (void)
+{
+ if (flag_m68k_mri)
+ {
+ op_rank[O_multiply] = MRI_MUL_PRECEDENCE;
+ op_rank[O_divide] = MRI_MUL_PRECEDENCE;
+ op_rank[O_modulus] = MRI_MUL_PRECEDENCE;
+ }
+ else
+ {
+ op_rank[O_multiply] = STANDARD_MUL_PRECEDENCE;
+ op_rank[O_divide] = STANDARD_MUL_PRECEDENCE;
+ op_rank[O_modulus] = STANDARD_MUL_PRECEDENCE;
+ }
+}
+
+/* Initialize the expression parser. */
+
+void
+expr_begin (void)
+{
+ expr_set_precedence ();
+
+ /* Verify that X_op field is wide enough. */
+ {
+ expressionS e;
+ e.X_op = O_max;
+ assert (e.X_op == O_max);
+ }
+}
+\f
+/* Return the encoding for the operator at INPUT_LINE_POINTER, and
+ sets NUM_CHARS to the number of characters in the operator.
+ Does not advance INPUT_LINE_POINTER. */
+
+static inline operatorT
+operator (int *num_chars)
+{
+ int c;
+ operatorT ret;
+
+ c = *input_line_pointer & 0xff;
+ *num_chars = 1;
+
+ if (is_end_of_line[c])
+ return O_illegal;
+
+ switch (c)
+ {
+ default:
+ return op_encoding[c];
+
+ case '+':
+ case '-':
+ /* Do not allow a++b and a--b to be a + (+b) and a - (-b)
+ Disabled, since the preprocessor removes whitespace. */
+ if (1 || input_line_pointer[1] != c)
+ return op_encoding[c];
+ return O_illegal;
+
+ 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;
+ }
+ *num_chars = 2;
+ return ret;
+
+ case '=':
+ if (input_line_pointer[1] != '=')
+ return op_encoding[c];
+
+ *num_chars = 2;
+ return O_eq;
+
+ case '>':
+ switch (input_line_pointer[1])
+ {
+ default:
+ return op_encoding[c];
+ case '>':
+ ret = O_right_shift;
+ break;
+ case '=':
+ ret = O_ge;
+ break;
+ }
+ *num_chars = 2;
+ return ret;
+
+ case '!':
+ /* We accept !! as equivalent to ^ for MRI compatibility. */
+ if (input_line_pointer[1] != '!')
+ {
+ if (flag_m68k_mri)
+ return O_bit_inclusive_or;
+ return op_encoding[c];
+ }
+ *num_chars = 2;
+ return O_bit_exclusive_or;
+
+ case '|':
+ if (input_line_pointer[1] != '|')
+ return op_encoding[c];
+
+ *num_chars = 2;
+ return O_logical_or;
+
+ case '&':
+ if (input_line_pointer[1] != '&')
+ return op_encoding[c];
+
+ *num_chars = 2;
+ return O_logical_and;
+ }
+
+ /* NOTREACHED */
+}
+
+/* Parse an expression. */
+
+segT
+expr (int rankarg, /* Larger # is higher rank. */
+ expressionS *resultP /* Deliver result here. */)
+{
+ operator_rankT rank = (operator_rankT) rankarg;
+ segT retval;
+ expressionS right;
+ operatorT op_left;
+ operatorT op_right;
+ int op_chars;
+
+ know (rank >= 0);
+
+ /* Save the value of dot for the fixup code. */
+ if (rank == 0)
+ dot_value = frag_now_fix ();
+
+ retval = operand (resultP);
+
+ /* operand () gobbles spaces. */
+ know (*input_line_pointer != ' ');
+
+ op_left = operator (&op_chars);
+ while (op_left != O_illegal && op_rank[(int) op_left] > rank)
+ {
+ segT rightseg;
+
+ input_line_pointer += op_chars; /* -> after 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 (op_left == O_index)
+ {
+ if (*input_line_pointer != ']')
+ as_bad ("missing right bracket");
+ else
+ {
+ ++input_line_pointer;
+ SKIP_WHITESPACE ();
+ }
+ }
+
+ op_right = operator (&op_chars);
+
+ 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_logical_or);
+
+ /* 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)
+ {
+ if (resultP->X_add_number > 0)
+ as_warn (_("left operand is a bignum; integer 0 assumed"));
+ else
+ as_warn (_("left operand is a float; integer 0 assumed"));
+ resultP->X_op = O_constant;
+ resultP->X_add_number = 0;
+ resultP->X_add_symbol = NULL;
+ resultP->X_op_symbol = NULL;
+ }
+ if (right.X_op == O_big)
+ {
+ if (right.X_add_number > 0)
+ as_warn (_("right operand is a bignum; integer 0 assumed"));
+ else
+ as_warn (_("right operand is a float; integer 0 assumed"));
+ right.X_op = O_constant;
+ right.X_add_number = 0;
+ right.X_add_symbol = NULL;
+ right.X_op_symbol = NULL;
+ }
+
+ /* Optimize common cases. */
+#ifdef md_optimize_expr
+ if (md_optimize_expr (resultP, op_left, &right))
+ {
+ /* Skip. */
+ ;
+ }
+ else
+#endif
+ 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
+ && (symbol_get_frag (right.X_add_symbol)
+ == symbol_get_frag (resultP->X_add_symbol))
+ && (SEG_NORMAL (rightseg)
+ || right.X_add_symbol == resultP->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 (_("division by zero"));
+ v = 1;
+ }
+ switch (op_left)
+ {
+ 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:
+ /* We always use unsigned shifts, to avoid relying on
+ characteristics of the compiler used to compile gas. */
+ resultP->X_add_number =
+ (offsetT) ((valueT) resultP->X_add_number >> (valueT) 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;
+ case O_logical_and:
+ resultP->X_add_number = resultP->X_add_number && v;
+ break;
+ case O_logical_or:
+ resultP->X_add_number = resultP->X_add_number || v;
+ break;
+ }
+ }
+ 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;
+ if (retval == rightseg && SEG_NORMAL (retval))
+ {
+ retval = absolute_section;
+ rightseg = absolute_section;
+ }
+ }
+ }
+ 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;
+ }
+
+ if (retval != rightseg)
+ {
+ if (! SEG_NORMAL (retval))
+ {
+ if (retval != undefined_section || SEG_NORMAL (rightseg))
+ retval = rightseg;
+ }
+ else if (SEG_NORMAL (rightseg)
+#ifdef DIFF_EXPR_OK
+ && op_left != O_subtract
+#endif
+ )
+ as_bad (_("operation combines symbols in different segments"));
+ }
+
+ op_left = op_right;
+ } /* While next operator is >= this rank. */
+
+ /* The PA port needs this information. */
+ if (resultP->X_add_symbol)
+ symbol_mark_used (resultP->X_add_symbol);
+
+ return resultP->X_op == O_constant ? absolute_section : retval;
+}
+\f
+/* This lives here because it belongs equally in expr.c & read.c.
+ expr.c is just a branch office read.c anyway, and putting it
+ here lessens the crowd at read.c.
+
+ Assume input_line_pointer is at start of symbol name.
+ Advance input_line_pointer past symbol name.
+ Turn that character into a '\0', returning its former value.
+ This allows a string compare (RMS wants symbol names to be strings)
+ of the symbol name.
+ There will always be a char following symbol name, because all good
+ lines end in end-of-line. */
+
char
- get_symbol_end()
+get_symbol_end (void)
{
- register char c;
-
- while (is_part_of_name(c = * input_line_pointer ++))
+ char c;
+
+ /* We accept \001 in a name in case this is being called with a
+ constructed string. */
+ if (is_name_beginner (c = *input_line_pointer++) || c == '\001')
+ {
+ while (is_part_of_name (c = *input_line_pointer++)
+ || c == '\001')
;
- * -- input_line_pointer = 0;
- return (c);
+ if (is_name_ender (c))
+ c = *input_line_pointer++;
+ }
+ *--input_line_pointer = 0;
+ return (c);
}
-
-unsigned int get_single_number()
+unsigned int
+get_single_number (void)
{
- 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 / deliverable / binutils-gdb.git / blobdiff