152 lines
4.8 KiB
C
152 lines
4.8 KiB
C
/* Definitions for expressions stored in reversed prefix form, for GDB.
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Copyright (C) 1986-2015 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#if !defined (EXPRESSION_H)
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#define EXPRESSION_H 1
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#include "symtab.h" /* Needed for "struct block" type. */
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#include "doublest.h" /* Needed for DOUBLEST. */
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/* Definitions for saved C expressions. */
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/* An expression is represented as a vector of union exp_element's.
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Each exp_element is an opcode, except that some opcodes cause
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the following exp_element to be treated as a long or double constant
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or as a variable. The opcodes are obeyed, using a stack for temporaries.
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The value is left on the temporary stack at the end. */
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/* When it is necessary to include a string,
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it can occupy as many exp_elements as it needs.
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We find the length of the string using strlen,
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divide to find out how many exp_elements are used up,
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and skip that many. Strings, like numbers, are indicated
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by the preceding opcode. */
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enum exp_opcode
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{
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#define OP(name) name ,
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#include "std-operator.def"
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/* First extension operator. Individual language modules define extra
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operators in *.def include files below with numbers higher than
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OP_EXTENDED0. */
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OP (OP_EXTENDED0)
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/* Language specific operators. */
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#include "ada-operator.def"
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#undef OP
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/* Existing only to swallow the last comma (',') from last .inc file. */
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OP_UNUSED_LAST
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};
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union exp_element
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{
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enum exp_opcode opcode;
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struct symbol *symbol;
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LONGEST longconst;
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DOUBLEST doubleconst;
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gdb_byte decfloatconst[16];
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/* Really sizeof (union exp_element) characters (or less for the last
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element of a string). */
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char string;
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struct type *type;
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struct internalvar *internalvar;
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const struct block *block;
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struct objfile *objfile;
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};
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struct expression
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{
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const struct language_defn *language_defn; /* language it was
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entered in. */
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struct gdbarch *gdbarch; /* architecture it was parsed in. */
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int nelts;
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union exp_element elts[1];
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};
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/* Macros for converting between number of expression elements and bytes
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to store that many expression elements. */
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#define EXP_ELEM_TO_BYTES(elements) \
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((elements) * sizeof (union exp_element))
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#define BYTES_TO_EXP_ELEM(bytes) \
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(((bytes) + sizeof (union exp_element) - 1) / sizeof (union exp_element))
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/* From parse.c */
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extern struct expression *parse_expression (const char *);
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extern struct type *parse_expression_for_completion (const char *, char **,
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enum type_code *);
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extern struct expression *parse_exp_1 (const char **, CORE_ADDR pc,
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const struct block *, int);
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/* For use by parsers; set if we want to parse an expression and
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attempt completion. */
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extern int parse_completion;
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/* The innermost context required by the stack and register variables
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we've encountered so far. To use this, set it to NULL, then call
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parse_<whatever>, then look at it. */
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extern const struct block *innermost_block;
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/* From eval.c */
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/* Values of NOSIDE argument to eval_subexp. */
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enum noside
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{
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EVAL_NORMAL,
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EVAL_SKIP, /* Only effect is to increment pos. */
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EVAL_AVOID_SIDE_EFFECTS /* Don't modify any variables or
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call any functions. The value
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returned will have the correct
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type, and will have an
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approximately correct lvalue
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type (inaccuracy: anything that is
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listed as being in a register in
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the function in which it was
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declared will be lval_register).
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Ideally this would not even read
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target memory, but currently it
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does in many situations. */
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};
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extern struct value *evaluate_subexp_standard
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(struct type *, struct expression *, int *, enum noside);
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/* From expprint.c */
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extern void print_expression (struct expression *, struct ui_file *);
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extern char *op_name (struct expression *exp, enum exp_opcode opcode);
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extern char *op_string (enum exp_opcode);
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extern void dump_raw_expression (struct expression *,
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struct ui_file *, char *);
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extern void dump_prefix_expression (struct expression *, struct ui_file *);
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#endif /* !defined (EXPRESSION_H) */
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