| /* expr.c -operands, expressions- |
| Copyright (C) 1987-2015 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 3, 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, 51 Franklin Street - Fifth Floor, Boston, MA |
| 02110-1301, 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. */ |
| |
| #define min(a, b) ((a) < (b) ? (a) : (b)) |
| |
| #include "as.h" |
| #include "safe-ctype.h" |
| |
| #ifdef HAVE_LIMITS_H |
| #include <limits.h> |
| #endif |
| #ifndef CHAR_BIT |
| #define CHAR_BIT 8 |
| #endif |
| |
| static void floating_constant (expressionS * expressionP); |
| static valueT generic_bignum_to_int32 (void); |
| #ifdef BFD64 |
| static valueT generic_bignum_to_int64 (void); |
| #endif |
| static void integer_constant (int radix, expressionS * expressionP); |
| static void mri_char_constant (expressionS *); |
| static void clean_up_expression (expressionS * expressionP); |
| static segT operand (expressionS *, enum expr_mode); |
| static operatorT operatorf (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; |
| |
| /* 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) |
| { |
| expressionS zero; |
| symbolS *symbolP; |
| struct expr_symbol_line *n; |
| |
| if (expressionP->X_op == O_symbol |
| && expressionP->X_add_number == 0) |
| return expressionP->X_add_symbol; |
| |
| if (expressionP->X_op == O_big) |
| { |
| /* This won't work, because the actual value is stored in |
| generic_floating_point_number or generic_bignum, and we are |
| going to lose it if we haven't already. */ |
| if (expressionP->X_add_number > 0) |
| as_bad (_("bignum invalid")); |
| else |
| as_bad (_("floating point number invalid")); |
| zero.X_op = O_constant; |
| zero.X_add_number = 0; |
| zero.X_unsigned = 0; |
| zero.X_extrabit = 0; |
| clean_up_expression (&zero); |
| expressionP = &zero; |
| } |
| |
| /* 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 |
| : expressionP->X_op == O_register |
| ? reg_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. */ |
| |
| int |
| expr_symbol_where (symbolS *sym, char **pfile, unsigned int *pline) |
| { |
| struct expr_symbol_line *l; |
| |
| for (l = expr_symbol_lines; l != NULL; l = l->next) |
| { |
| if (l->sym == sym) |
| { |
| *pfile = l->file; |
| *pline = l->line; |
| return 1; |
| } |
| } |
| |
| return 0; |
| } |
| |
| /* 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; |
| e.X_extrabit = 0; |
| return make_expr_symbol (&e); |
| } |
| |
| /* Build an expression for the current location ('.'). */ |
| |
| symbolS * |
| expr_build_dot (void) |
| { |
| expressionS e; |
| |
| current_location (&e); |
| return symbol_clone_if_forward_ref (make_expr_symbol (&e)); |
| } |
| |
| /* Build any floating-point literal here. |
| Also build any bignum literal here. */ |
| |
| /* 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. */ |
| }; |
| |
| |
| static void |
| floating_constant (expressionS *expressionP) |
| { |
| /* 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 (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); |
| } |
| } |
| 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 |
| |
| if ((NUMBERS_WITH_SUFFIX || flag_m68k_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; |
| c = TOUPPER (c); |
| /* If we have both NUMBERS_WITH_SUFFIX and LOCAL_LABELS_FB, |
| we distinguish between 'B' and 'b'. This is the case for |
| Z80. */ |
| if ((NUMBERS_WITH_SUFFIX && LOCAL_LABELS_FB ? *suffix : c) == 'B') |
| radix = 2; |
| else if (c == 'D') |
| radix = 10; |
| else if (c == 'O' || c == 'Q') |
| radix = 8; |
| else if (c == 'H') |
| radix = 16; |
| else if (suffix[1] == '.' || c == 'E' || flt) |
| { |
| floating_constant (expressionP); |
| return; |
| } |
| else |
| { |
| radix = 10; |
| suffix = NULL; |
| } |
| } |
| } |
| |
| switch (radix) |
| { |
| case 2: |
| maxdig = 2; |
| too_many_digits = 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. */ |
| } |
| #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 (radix == 16 && c == '_') |
| { |
| /* This is literal of the form 0x333_0_12345678_1. |
| This example is equivalent to 0x00000333000000001234567800000001. */ |
| |
| int num_little_digits = 0; |
| int i; |
| input_line_pointer = start; /* -> 1st digit. */ |
| |
| know (LITTLENUM_NUMBER_OF_BITS == 16); |
| |
| for (c = '_'; c == '_'; num_little_digits += 2) |
| { |
| |
| /* Convert one 64-bit word. */ |
| int ndigit = 0; |
| number = 0; |
| for (c = *input_line_pointer++; |
| (digit = hex_value (c)) < maxdig; |
| c = *(input_line_pointer++)) |
| { |
| number = number * radix + digit; |
| ndigit++; |
| } |
| |
| /* Check for 8 digit per word max. */ |
| if (ndigit > 8) |
| as_bad (_("a bignum with underscores may not have more than 8 hex digits in any word")); |
| |
| /* Add this chunk to the bignum. |
| Shift things down 2 little digits. */ |
| know (LITTLENUM_NUMBER_OF_BITS == 16); |
| for (i = min (num_little_digits + 1, SIZE_OF_LARGE_NUMBER - 1); |
| i >= 2; |
| i--) |
| generic_bignum[i] = generic_bignum[i - 2]; |
| |
| /* Add the new digits as the least significant new ones. */ |
| generic_bignum[0] = number & 0xffffffff; |
| generic_bignum[1] = number >> 16; |
| } |
| |
| /* Again, c is char after number, input_line_pointer->after c. */ |
| |
| if (num_little_digits > SIZE_OF_LARGE_NUMBER - 1) |
| num_little_digits = SIZE_OF_LARGE_NUMBER - 1; |
| |
| gas_assert (num_little_digits >= 4); |
| |
| if (num_little_digits != 8) |
| as_bad (_("a bignum with underscores must have exactly 4 words")); |
| |
| /* We might have some leading zeros. These can be trimmed to give |
| us a change to fit this constant into a small number. */ |
| while (generic_bignum[num_little_digits - 1] == 0 |
| && num_little_digits > 1) |
| num_little_digits--; |
| |
| if (num_little_digits <= 2) |
| { |
| /* will fit into 32 bits. */ |
| number = generic_bignum_to_int32 (); |
| small = 1; |
| } |
| #ifdef BFD64 |
| else if (num_little_digits <= 4) |
| { |
| /* Will fit into 64 bits. */ |
| number = generic_bignum_to_int64 (); |
| small = 1; |
| } |
| #endif |
| else |
| { |
| small = 0; |
| |
| /* Number of littlenums in the bignum. */ |
| number = num_little_digits; |
| } |
| } |
| else 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; |
| 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++) |
| { |
| 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 (LITTLENUM_NUMBER_OF_BITS == 16); |
| if (leader < generic_bignum + 2) |
| { |
| /* Will fit into 32 bits. */ |
| number = generic_bignum_to_int32 (); |
| small = 1; |
| } |
| #ifdef BFD64 |
| else if (leader < generic_bignum + 4) |
| { |
| /* Will fit into 64 bits. */ |
| number = generic_bignum_to_int64 (); |
| small = 1; |
| } |
| #endif |
| else |
| { |
| /* Number of littlenums in the bignum. */ |
| number = leader - generic_bignum + 1; |
| } |
| } |
| |
| if ((NUMBERS_WITH_SUFFIX || flag_m68k_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))) |
| { |
| /* 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; |
| } |
| else |
| { |
| /* 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; |
| } |
| |
| 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; |
| 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 `.'. */ |
| |
| 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 = &dot_symbol; |
| 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, enum expr_mode mode) |
| { |
| 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; |
| expressionP->X_extrabit = 0; |
| |
| /* 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; |
| |
| #ifndef NEED_INDEX_OPERATOR |
| case '[': |
| # ifdef md_need_index_operator |
| if (md_need_index_operator()) |
| goto de_fault; |
| # endif |
| /* FALLTHROUGH */ |
| #endif |
| case '(': |
| /* Didn't begin with digit & not a name. */ |
| segment = expr (0, expressionP, mode); |
| /* expression () will pass trailing whitespace. */ |
| if ((c == '(' && *input_line_pointer != ')') |
| || (c == '[' && *input_line_pointer != ']')) |
| 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; |
| |
| #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 '-': |
| case '+': |
| { |
| #ifdef md_operator |
| unary: |
| #endif |
| operand (expressionP, mode); |
| if (expressionP->X_op == O_constant) |
| { |
| /* input_line_pointer -> char after operand. */ |
| if (c == '-') |
| { |
| expressionP->X_add_number |
| = - (addressT) expressionP->X_add_number; |
| /* Notice: '-' may overflow: no warning is given. |
| This is compatible with other people's |
| assemblers. Sigh. */ |
| expressionP->X_unsigned = 0; |
| if (expressionP->X_add_number) |
| expressionP->X_extrabit ^= 1; |
| } |
| else if (c == '~' || c == '"') |
| expressionP->X_add_number = ~ expressionP->X_add_number; |
| else if (c == '!') |
| 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]; |
| |
| /* Extend the bignum to at least the size of .octa. */ |
| if (expressionP->X_add_number < SIZE_OF_LARGE_NUMBER) |
| { |
| expressionP->X_add_number = SIZE_OF_LARGE_NUMBER; |
| for (; i < expressionP->X_add_number; ++i) |
| generic_bignum[i] = ~(LITTLENUM_TYPE) 0; |
| } |
| |
| if (c == '-') |
| for (i = 0; i < expressionP->X_add_number; ++i) |
| { |
| generic_bignum[i] += 1; |
| if (generic_bignum[i]) |
| break; |
| } |
| } |
| else if (c == '!') |
| { |
| for (i = 0; i < expressionP->X_add_number; ++i) |
| if (generic_bignum[i] != 0) |
| break; |
| expressionP->X_add_number = i >= expressionP->X_add_number; |
| expressionP->X_op = O_constant; |
| expressionP->X_unsigned = 1; |
| expressionP->X_extrabit = 0; |
| } |
| } |
| else if (expressionP->X_op != O_illegal |
| && expressionP->X_op != O_absent) |
| { |
| if (c != '+') |
| { |
| 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 (DOLLAR_AMBIGU && hex_p (*input_line_pointer)) |
| { |
| /* In MRI mode and on Z80, '$' 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: |
| #if defined(md_need_index_operator) || defined(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_operator |
| { |
| operatorT op = md_operator (name, 1, &c); |
| |
| switch (op) |
| { |
| case O_uminus: |
| *input_line_pointer = c; |
| c = '-'; |
| goto unary; |
| case O_bit_not: |
| *input_line_pointer = c; |
| c = '~'; |
| goto unary; |
| case O_logical_not: |
| *input_line_pointer = c; |
| c = '!'; |
| goto unary; |
| case O_illegal: |
| as_bad (_("invalid use of operator \"%s\""), name); |
| break; |
| default: |
| break; |
| } |
| if (op != O_absent && op != O_illegal) |
| { |
| *input_line_pointer = c; |
| expr (9, expressionP, mode); |
| expressionP->X_add_symbol = make_expr_symbol (expressionP); |
| expressionP->X_op_symbol = NULL; |
| expressionP->X_add_number = 0; |
| expressionP->X_op = op; |
| break; |
| } |
| } |
| #endif |
| |
| #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, mode, &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 (mode != expr_defer |
| && segment == absolute_section |
| && !S_FORCE_RELOC (symbolP, 0)) |
| { |
| expressionP->X_op = O_constant; |
| expressionP->X_add_number = S_GET_VALUE (symbolP); |
| } |
| else if (mode != expr_defer && 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 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); |
| |
| if (mode != expr_defer) |
| { |
| expressionP->X_add_symbol |
| = symbol_clone_if_forward_ref (expressionP->X_add_symbol); |
| expressionP->X_op_symbol |
| = symbol_clone_if_forward_ref (expressionP->X_op_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; |
| } |
| } |
| |
| /* 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; |
| } |
| } |
| |
| /* 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 |
| #ifndef O_SINGLE_EQ |
| #define O_SINGLE_EQ O_illegal |
| #endif |
| |
| /* 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_SINGLE_EQ, 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[O_max] = { |
| 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 */ |
| }; |
| |
| /* 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; |
| } |
| } |
| |
| void |
| expr_set_rank (operatorT op, operator_rankT rank) |
| { |
| gas_assert (op >= O_md1 && op < ARRAY_SIZE (op_rank)); |
| op_rank[op] = rank; |
| } |
| |
| /* 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; |
| gas_assert (e.X_op == O_max); |
| } |
| } |
| |
| /* 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 |
| operatorf (int *num_chars) |
| { |
| int c; |
| operatorT ret; |
| |
| c = *input_line_pointer & 0xff; |
| *num_chars = 1; |
| |
| if (is_end_of_line[c]) |
| return O_illegal; |
| |
| #ifdef md_operator |
| if (is_name_beginner (c)) |
| { |
| char *name = input_line_pointer; |
| char ec = get_symbol_end (); |
| |
| ret = md_operator (name, 2, &ec); |
| switch (ret) |
| { |
| case O_absent: |
| *input_line_pointer = ec; |
| input_line_pointer = name; |
| break; |
| case O_uminus: |
| case O_bit_not: |
| case O_logical_not: |
| as_bad (_("invalid use of operator \"%s\""), name); |
| ret = O_illegal; |
| /* FALLTHROUGH */ |
| default: |
| *input_line_pointer = ec; |
| *num_chars = input_line_pointer - name; |
| input_line_pointer = name; |
| return ret; |
| } |
| } |
| #endif |
| |
| switch (c) |
| { |
| default: |
| ret = op_encoding[c]; |
| #ifdef md_operator |
| if (ret == O_illegal) |
| { |
| char *start = input_line_pointer; |
| |
| ret = md_operator (NULL, 2, NULL); |
| if (ret != O_illegal) |
| *num_chars = input_line_pointer - start; |
| input_line_pointer = start; |
| } |
| #endif |
| return ret; |
| |
| case '+': |
| case '-': |
| 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; |
| } |
| *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 '!': |
| switch (input_line_pointer[1]) |
| { |
| case '!': |
| /* We accept !! as equivalent to ^ for MRI compatibility. */ |
| *num_chars = 2; |
| return O_bit_exclusive_or; |
| case '=': |
| /* We accept != as equivalent to <>. */ |
| *num_chars = 2; |
| return O_ne; |
| default: |
| if (flag_m68k_mri) |
| return O_bit_inclusive_or; |
| return op_encoding[c]; |
| } |
| |
| 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 */ |
| } |
| |
| /* Implement "word-size + 1 bit" addition for |
| {resultP->X_extrabit:resultP->X_add_number} + {rhs_highbit:amount}. This |
| is used so that the full range of unsigned word values and the full range of |
| signed word values can be represented in an O_constant expression, which is |
| useful e.g. for .sleb128 directives. */ |
| |
| void |
| add_to_result (expressionS *resultP, offsetT amount, int rhs_highbit) |
| { |
| valueT ures = resultP->X_add_number; |
| valueT uamount = amount; |
| |
| resultP->X_add_number += amount; |
| |
| resultP->X_extrabit ^= rhs_highbit; |
| |
| if (ures + uamount < ures) |
| resultP->X_extrabit ^= 1; |
| } |
| |
| /* Similarly, for subtraction. */ |
| |
| void |
| subtract_from_result (expressionS *resultP, offsetT amount, int rhs_highbit) |
| { |
| valueT ures = resultP->X_add_number; |
| valueT uamount = amount; |
| |
| resultP->X_add_number -= amount; |
| |
| resultP->X_extrabit ^= rhs_highbit; |
| |
| if (ures < uamount) |
| resultP->X_extrabit ^= 1; |
| } |
| |
| /* Parse an expression. */ |
| |
| segT |
| expr (int rankarg, /* Larger # is higher rank. */ |
| expressionS *resultP, /* Deliver result here. */ |
| enum expr_mode mode /* Controls behavior. */) |
| { |
| operator_rankT rank = (operator_rankT) rankarg; |
| segT retval; |
| expressionS right; |
| operatorT op_left; |
| operatorT op_right; |
| int op_chars; |
| |
| know (rankarg >= 0); |
| |
| /* Save the value of dot for the fixup code. */ |
| if (rank == 0) |
| { |
| dot_value = frag_now_fix (); |
| dot_frag = frag_now; |
| } |
| |
| retval = operand (resultP, mode); |
| |
| /* operand () gobbles spaces. */ |
| know (*input_line_pointer != ' '); |
| |
| op_left = operatorf (&op_chars); |
| while (op_left != O_illegal && op_rank[(int) op_left] > rank) |
| { |
| segT rightseg; |
| offsetT frag_off; |
| |
| input_line_pointer += op_chars; /* -> after operator. */ |
| |
| right.X_md = 0; |
| rightseg = expr (op_rank[(int) op_left], &right, mode); |
| 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 = operatorf (&op_chars); |
| |
| know (op_right == O_illegal || op_left == O_index |
| || op_rank[(int) op_right] <= op_rank[(int) op_left]); |
| know ((int) op_left >= (int) O_multiply); |
| #ifndef md_operator |
| know ((int) op_left <= (int) O_index); |
| #else |
| know ((int) op_left < (int) O_max); |
| #endif |
| |
| /* 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 |
| #ifndef md_register_arithmetic |
| # define md_register_arithmetic 1 |
| #endif |
| if (op_left == O_add && right.X_op == O_constant |
| && (md_register_arithmetic || resultP->X_op != O_register)) |
| { |
| /* X + constant. */ |
| add_to_result (resultP, right.X_add_number, right.X_extrabit); |
| } |
| /* This case comes up in PIC code. */ |
| else if (op_left == O_subtract |
| && right.X_op == O_symbol |
| && resultP->X_op == O_symbol |
| && retval == rightseg |
| #ifdef md_allow_local_subtract |
| && md_allow_local_subtract (resultP, & right, rightseg) |
| #endif |
| && ((SEG_NORMAL (rightseg) |
| && !S_FORCE_RELOC (resultP->X_add_symbol, 0) |
| && !S_FORCE_RELOC (right.X_add_symbol, 0)) |
| || right.X_add_symbol == resultP->X_add_symbol) |
| && frag_offset_fixed_p (symbol_get_frag (resultP->X_add_symbol), |
| symbol_get_frag (right.X_add_symbol), |
| &frag_off)) |
| { |
| offsetT symval_diff = S_GET_VALUE (resultP->X_add_symbol) |
| - S_GET_VALUE (right.X_add_symbol); |
| subtract_from_result (resultP, right.X_add_number, right.X_extrabit); |
| subtract_from_result (resultP, frag_off / OCTETS_PER_BYTE, 0); |
| add_to_result (resultP, symval_diff, symval_diff < 0); |
| resultP->X_op = O_constant; |
| resultP->X_add_symbol = 0; |
| } |
| else if (op_left == O_subtract && right.X_op == O_constant |
| && (md_register_arithmetic || resultP->X_op != O_register)) |
| { |
| /* X - constant. */ |
| subtract_from_result (resultP, right.X_add_number, right.X_extrabit); |
| } |
| else if (op_left == O_add && resultP->X_op == O_constant |
| && (md_register_arithmetic || right.X_op != O_register)) |
| { |
| /* Constant + X. */ |
| resultP->X_op = right.X_op; |
| resultP->X_add_symbol = right.X_add_symbol; |
| resultP->X_op_symbol = right.X_op_symbol; |
| add_to_result (resultP, right.X_add_number, right.X_extrabit); |
| 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; |
| } |
| if ((valueT) v >= sizeof(valueT) * CHAR_BIT |
| && (op_left == O_left_shift || op_left == O_right_shift)) |
| { |
| as_warn_value_out_of_range (_("shift count"), v, 0, |
| sizeof(valueT) * CHAR_BIT - 1, |
| NULL, 0); |
| resultP->X_add_number = v = 0; |
| } |
| switch (op_left) |
| { |
| default: goto general; |
| 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; |
| /* Constant + constant (O_add) is handled by the |
| previous if statement for constant + X, so is omitted |
| here. */ |
| case O_subtract: |
| subtract_from_result (resultP, v, 0); |
| 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) |
| add_to_result (resultP, right.X_add_number, right.X_extrabit); |
| else if (op_left == O_subtract) |
| { |
| subtract_from_result (resultP, right.X_add_number, |
| right.X_extrabit); |
| if (retval == rightseg |
| && SEG_NORMAL (retval) |
| && !S_FORCE_RELOC (resultP->X_add_symbol, 0) |
| && !S_FORCE_RELOC (right.X_add_symbol, 0)) |
| { |
| retval = absolute_section; |
| rightseg = absolute_section; |
| } |
| } |
| } |
| else |
| { |
| general: |
| /* The general case. */ |
| resultP->X_add_symbol = make_expr_symbol (resultP); |
| resultP->X_op_symbol = make_expr_symbol (&right); |
| resultP->X_op = op_left; |
| resultP->X_add_number = 0; |
| resultP->X_unsigned = 1; |
| resultP->X_extrabit = 0; |
| } |
| |
| if (retval != rightseg) |
| { |
| if (retval == undefined_section) |
| ; |
| else if (rightseg == undefined_section) |
| retval = rightseg; |
| else if (retval == expr_section) |
| ; |
| else if (rightseg == expr_section) |
| retval = rightseg; |
| else if (retval == reg_section) |
| ; |
| else if (rightseg == reg_section) |
| retval = rightseg; |
| else if (rightseg == absolute_section) |
| ; |
| else if (retval == absolute_section) |
| retval = rightseg; |
| #ifdef DIFF_EXPR_OK |
| else if (op_left == O_subtract) |
| ; |
| #endif |
| else |
| 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); |
| |
| if (rank == 0 && mode == expr_evaluate) |
| resolve_expression (resultP); |
| |
| return resultP->X_op == O_constant ? absolute_section : retval; |
| } |
| |
| /* Resolve an expression without changing any symbols/sub-expressions |
| used. */ |
| |
| int |
| resolve_expression (expressionS *expressionP) |
| { |
| /* Help out with CSE. */ |
| valueT final_val = expressionP->X_add_number; |
| symbolS *add_symbol = expressionP->X_add_symbol; |
| symbolS *orig_add_symbol = add_symbol; |
| symbolS *op_symbol = expressionP->X_op_symbol; |
| operatorT op = expressionP->X_op; |
| valueT left, right; |
| segT seg_left, seg_right; |
| fragS *frag_left, *frag_right; |
| offsetT frag_off; |
| |
| switch (op) |
| { |
| default: |
| return 0; |
| |
| case O_constant: |
| case O_register: |
| left = 0; |
| break; |
| |
| case O_symbol: |
| case O_symbol_rva: |
| if (!snapshot_symbol (&add_symbol, &left, &seg_left, &frag_left)) |
| return 0; |
| |
| break; |
| |
| case O_uminus: |
| case O_bit_not: |
| case O_logical_not: |
| if (!snapshot_symbol (&add_symbol, &left, &seg_left, &frag_left)) |
| return 0; |
| |
| if (seg_left != absolute_section) |
| return 0; |
| |
| if (op == O_logical_not) |
| left = !left; |
| else if (op == O_uminus) |
| left = -left; |
| else |
| left = ~left; |
| op = O_constant; |
| break; |
| |
| case O_multiply: |
| case O_divide: |
| case O_modulus: |
| case O_left_shift: |
| case O_right_shift: |
| case O_bit_inclusive_or: |
| case O_bit_or_not: |
| case O_bit_exclusive_or: |
| case O_bit_and: |
| case O_add: |
| case O_subtract: |
| case O_eq: |
| case O_ne: |
| case O_lt: |
| case O_le: |
| case O_ge: |
| case O_gt: |
| case O_logical_and: |
| case O_logical_or: |
| if (!snapshot_symbol (&add_symbol, &left, &seg_left, &frag_left) |
| || !snapshot_symbol (&op_symbol, &right, &seg_right, &frag_right)) |
| return 0; |
| |
| /* Simplify addition or subtraction of a constant by folding the |
| constant into X_add_number. */ |
| if (op == O_add) |
| { |
| if (seg_right == absolute_section) |
| { |
| final_val += right; |
| op = O_symbol; |
| break; |
| } |
| else if (seg_left == absolute_section) |
| { |
| final_val += left; |
| left = right; |
| seg_left = seg_right; |
| add_symbol = op_symbol; |
| orig_add_symbol = expressionP->X_op_symbol; |
| op = O_symbol; |
| break; |
| } |
| } |
| else if (op == O_subtract) |
| { |
| if (seg_right == absolute_section) |
| { |
| final_val -= right; |
| op = O_symbol; |
| break; |
| } |
| } |
| |
| /* Equality and non-equality tests are permitted on anything. |
| Subtraction, and other comparison operators are permitted if |
| both operands are in the same section. |
| Shifts by constant zero are permitted on anything. |
| Multiplies, bit-ors, and bit-ands with constant zero are |
| permitted on anything. |
| Multiplies and divides by constant one are permitted on |
| anything. |
| Binary operations with both operands being the same register |
| or undefined symbol are permitted if the result doesn't depend |
| on the input value. |
| Otherwise, both operands must be absolute. We already handled |
| the case of addition or subtraction of a constant above. */ |
| frag_off = 0; |
| if (!(seg_left == absolute_section |
| && seg_right == absolute_section) |
| && !(op == O_eq || op == O_ne) |
| && !((op == O_subtract |
| || op == O_lt || op == O_le || op == O_ge || op == O_gt) |
| && seg_left == seg_right |
| && (finalize_syms |
| || frag_offset_fixed_p (frag_left, frag_right, &frag_off)) |
| && (seg_left != reg_section || left == right) |
| && (seg_left != undefined_section || add_symbol == op_symbol))) |
| { |
| if ((seg_left == absolute_section && left == 0) |
| || (seg_right == absolute_section && right == 0)) |
| { |
| if (op == O_bit_exclusive_or || op == O_bit_inclusive_or) |
| { |
| if (!(seg_right == absolute_section && right == 0)) |
| { |
| seg_left = seg_right; |
| left = right; |
| add_symbol = op_symbol; |
| orig_add_symbol = expressionP->X_op_symbol; |
| } |
| op = O_symbol; |
| break; |
| } |
| else if (op == O_left_shift || op == O_right_shift) |
| { |
| if (!(seg_left == absolute_section && left == 0)) |
| { |
| op = O_symbol; |
| break; |
| } |
| } |
| else if (op != O_multiply |
| && op != O_bit_or_not && op != O_bit_and) |
| return 0; |
| } |
| else if (op == O_multiply |
| && seg_left == absolute_section && left == 1) |
| { |
| seg_left = seg_right; |
| left = right; |
| add_symbol = op_symbol; |
| orig_add_symbol = expressionP->X_op_symbol; |
| op = O_symbol; |
| break; |
| } |
| else if ((op == O_multiply || op == O_divide) |
| && seg_right == absolute_section && right == 1) |
| { |
| op = O_symbol; |
| break; |
| } |
| else if (!(left == right |
| && ((seg_left == reg_section && seg_right == reg_section) |
| || (seg_left == undefined_section |
| && seg_right == undefined_section |
| && add_symbol == op_symbol)))) |
| return 0; |
| else if (op == O_bit_and || op == O_bit_inclusive_or) |
| { |
| op = O_symbol; |
| break; |
| } |
| else if (op != O_bit_exclusive_or && op != O_bit_or_not) |
| return 0; |
| } |
| |
| right += frag_off / OCTETS_PER_BYTE; |
| switch (op) |
| { |
| case O_add: left += right; break; |
| case O_subtract: left -= right; break; |
| case O_multiply: left *= right; break; |
| case O_divide: |
| if (right == 0) |
| return 0; |
| left = (offsetT) left / (offsetT) right; |
| break; |
| case O_modulus: |
| if (right == 0) |
| return 0; |
| left = (offsetT) left % (offsetT) right; |
| break; |
| case O_left_shift: left <<= right; break; |
| case O_right_shift: left >>= right; break; |
| case O_bit_inclusive_or: left |= right; break; |
| case O_bit_or_not: left |= ~right; break; |
| case O_bit_exclusive_or: left ^= right; break; |
| case O_bit_and: left &= right; break; |
| case O_eq: |
| case O_ne: |
| left = (left == right |
| && seg_left == seg_right |
| && (finalize_syms || frag_left == frag_right) |
| && (seg_left != undefined_section |
| || add_symbol == op_symbol) |
| ? ~ (valueT) 0 : 0); |
| if (op == O_ne) |
| left = ~left; |
| break; |
| case O_lt: |
| left = (offsetT) left < (offsetT) right ? ~ (valueT) 0 : 0; |
| break; |
| case O_le: |
| left = (offsetT) left <= (offsetT) right ? ~ (valueT) 0 : 0; |
| break; |
| case O_ge: |
| left = (offsetT) left >= (offsetT) right ? ~ (valueT) 0 : 0; |
| break; |
| case O_gt: |
| left = (offsetT) left > (offsetT) right ? ~ (valueT) 0 : 0; |
| break; |
| case O_logical_and: left = left && right; break; |
| case O_logical_or: left = left || right; break; |
| default: abort (); |
| } |
| |
| op = O_constant; |
| break; |
| } |
| |
| if (op == O_symbol) |
| { |
| if (seg_left == absolute_section) |
| op = O_constant; |
| else if (seg_left == reg_section && final_val == 0) |
| op = O_register; |
| else if (!symbol_same_p (add_symbol, orig_add_symbol)) |
| final_val += left; |
| expressionP->X_add_symbol = add_symbol; |
| } |
| expressionP->X_op = op; |
| |
| if (op == O_constant || op == O_register) |
| final_val += left; |
| expressionP->X_add_number = final_val; |
| |
| return 1; |
| } |
| |
| /* 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 (void) |
| { |
| 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') |
| ; |
| if (is_name_ender (c)) |
| c = *input_line_pointer++; |
| } |
| *--input_line_pointer = 0; |
| return (c); |
| } |
| |
| unsigned int |
| get_single_number (void) |
| { |
| expressionS exp; |
| operand (&exp, expr_normal); |
| return exp.X_add_number; |
| } |