X-Git-Url: http://drtracing.org/?a=blobdiff_plain;f=gas%2Fexpr.h;h=32a16619b1d597fc0ec23fc70e423610cb866c5a;hb=9de8d8f1848f870605f4e94ffd9d2f1baa005c93;hp=24d3da23e84b7d6002f22ba3b99ad3ce4d8d19a1;hpb=a39116f1c91d3642c068d9df871338cca9006be2;p=deliverable%2Fbinutils-gdb.git diff --git a/gas/expr.h b/gas/expr.h index 24d3da23e8..32a16619b1 100644 --- a/gas/expr.h +++ b/gas/expr.h @@ -1,81 +1,157 @@ /* expr.h -> header file for expr.c - Copyright (C) 1987 Free Software Foundation, Inc. - + Copyright (C) 1987, 92-98, 1999 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. */ -/* - * Abbreviations (mnemonics). - * - * O operator - * Q quantity, operand - * X eXpression - */ + 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, 59 Temple Place - Suite 330, Boston, MA + 02111-1307, USA. */ /* * By popular demand, we define a struct to represent an expression. * This will no doubt mutate as expressions become baroque. * - * Currently, we support expressions like "foo-bar+42". - * In other words we permit a (possibly undefined) minuend, a - * (possibly undefined) subtrahend and an (absolute) augend. - * RMS says this is so we can have 1-pass assembly for any compiler - * emmissions, and a 'case' statement might emit 'undefined1 - undefined2'. + * Currently, we support expressions like "foo OP bar + 42". In other + * words we permit a (possibly undefined) symbol, a (possibly + * undefined) symbol and the operation used to combine the symbols, + * and an (absolute) augend. RMS says this is so we can have 1-pass + * assembly for any compiler emissions, and a 'case' statement might + * emit 'undefined1 - undefined2'. * - * To simplify table-driven dispatch, we also have a "segment" for the - * entire expression. That way we don't require complex reasoning about - * whether particular components are defined; and we can change component - * semantics without re-working all the dispatch tables in the assembler. - * In other words the "type" of an expression is its segment. + * The type of an expression used to be stored as a segment. That got + * confusing because it overloaded the concept of a segment. I added + * an operator field, instead. */ -typedef struct -{ - symbolS *X_add_symbol; /* foo */ - symbolS *X_subtract_symbol; /* bar */ - long X_add_number; /* 42. Must be signed. */ - segT X_seg; /* What segment (expr type)? */ -} -expressionS; +/* This is the type of an expression. The operator types are also + used while parsing an expression. -/* result should be type (expressionS *). */ -#define expression(result) expr(0,result) + NOTE: This enumeration must match the op_rank array in expr.c. */ -/* If an expression is SEG_BIG, look here */ -/* for its value. These common data may */ -/* be clobbered whenever expr() is called. */ -extern FLONUM_TYPE generic_floating_point_number; /* Flonums returned here. */ -/* Enough to hold most precise flonum. */ -extern LITTLENUM_TYPE generic_bignum []; /* Bignums returned here. */ -#define SIZE_OF_LARGE_NUMBER (20) /* Number of littlenums in above. */ +typedef enum +{ + /* An illegal expression. */ + O_illegal, + /* A nonexistent expression. */ + O_absent, + /* X_add_number (a constant expression). */ + O_constant, + /* X_add_symbol + X_add_number. */ + O_symbol, + /* X_add_symbol + X_add_number - the base address of the image. */ + O_symbol_rva, + /* A register (X_add_number is register number). */ + O_register, + /* A big value. If X_add_number is negative or 0, the value is in + generic_floating_point_number. Otherwise the value is in + generic_bignum, and X_add_number is the number of LITTLENUMs in + the value. */ + O_big, + /* (- X_add_symbol) + X_add_number. */ + O_uminus, + /* (~ X_add_symbol) + X_add_number. */ + O_bit_not, + /* (! X_add_symbol) + X_add_number. */ + O_logical_not, + /* (X_add_symbol * X_op_symbol) + X_add_number. */ + O_multiply, + /* (X_add_symbol / X_op_symbol) + X_add_number. */ + O_divide, + /* X_add_symbol % X_op_symbol) + X_add_number. */ + O_modulus, + /* X_add_symbol << X_op_symbol) + X_add_number. */ + O_left_shift, + /* X_add_symbol >> X_op_symbol) + X_add_number. */ + O_right_shift, + /* X_add_symbol | X_op_symbol) + X_add_number. */ + O_bit_inclusive_or, + /* X_add_symbol |~ X_op_symbol) + X_add_number. */ + O_bit_or_not, + /* X_add_symbol ^ X_op_symbol) + X_add_number. */ + O_bit_exclusive_or, + /* X_add_symbol & X_op_symbol) + X_add_number. */ + O_bit_and, + /* X_add_symbol + X_op_symbol) + X_add_number. */ + O_add, + /* X_add_symbol - X_op_symbol) + X_add_number. */ + O_subtract, + /* (X_add_symbol == X_op_symbol) + X_add_number. */ + O_eq, + /* (X_add_symbol != X_op_symbol) + X_add_number. */ + O_ne, + /* (X_add_symbol < X_op_symbol) + X_add_number. */ + O_lt, + /* (X_add_symbol <= X_op_symbol) + X_add_number. */ + O_le, + /* (X_add_symbol >= X_op_symbol) + X_add_number. */ + O_ge, + /* (X_add_symbol > X_op_symbol) + X_add_number. */ + O_gt, + /* (X_add_symbol && X_op_symbol) + X_add_number. */ + O_logical_and, + /* (X_add_symbol || X_op_symbol) + X_add_number. */ + O_logical_or, + /* X_op_symbol [ X_add_symbol ] */ + O_index, + /* this must be the largest value */ + O_max +} operatorT; -typedef char operator_rankT; +typedef struct expressionS +{ + /* The main symbol. */ + symbolS *X_add_symbol; + /* The second symbol, if needed. */ + symbolS *X_op_symbol; + /* A number to add. */ + offsetT X_add_number; + /* The type of the expression. */ + operatorT X_op; + /* Non-zero if X_add_number should be regarded as unsigned. This is + only valid for O_constant expressions. It is only used when an + O_constant must be extended into a bignum (i.e., it is not used + when performing arithmetic on these values). + FIXME: This field is not set very reliably. */ + unsigned int X_unsigned : 1; +} expressionS; -#ifdef __STDC__ +/* "result" should be type (expressionS *). */ +#define expression(result) expr (0, result) -char get_symbol_end(void); -segT expr(int rank, expressionS *resultP); -unsigned int get_single_number(void); +/* If an expression is O_big, look here for its value. These common + data may be clobbered whenever expr() is called. */ +/* Flonums returned here. Big enough to hold most precise flonum. */ +extern FLONUM_TYPE generic_floating_point_number; +/* Bignums returned here. */ +extern LITTLENUM_TYPE generic_bignum[]; +/* Number of littlenums in above. */ +#define SIZE_OF_LARGE_NUMBER (20) -#else /* __STDC__ */ +typedef char operator_rankT; -char get_symbol_end(); -segT expr(); -unsigned int get_single_number(); +extern char get_symbol_end PARAMS ((void)); +extern void expr_begin PARAMS ((void)); +extern void expr_set_precedence PARAMS ((void)); +extern segT expr PARAMS ((int rank, expressionS * resultP)); +extern unsigned int get_single_number PARAMS ((void)); +extern symbolS *make_expr_symbol PARAMS ((expressionS * expressionP)); +extern int expr_symbol_where + PARAMS ((symbolS *, char **, unsigned int *)); -#endif /* __STDC__ */ +extern symbolS *expr_build_uconstant PARAMS ((offsetT)); +extern symbolS *expr_build_unary PARAMS ((operatorT, symbolS *)); +extern symbolS *expr_build_binary PARAMS ((operatorT, symbolS *, symbolS *)); +extern symbolS *expr_build_dot PARAMS ((void)); -/* end: expr.h */ +/* end of expr.h */