/* Definitions for expressions stored in reversed prefix form, for GDB.
- Copyright (C) 1986 Free Software Foundation, Inc.
-GDB is distributed in the hope that it will be useful, but WITHOUT ANY
-WARRANTY. No author or distributor accepts responsibility to anyone
-for the consequences of using it or for whether it serves any
-particular purpose or works at all, unless he says so in writing.
-Refer to the GDB General Public License for full details.
+ Copyright (C) 1986-2017 Free Software Foundation, Inc.
-Everyone is granted permission to copy, modify and redistribute GDB,
-but only under the conditions described in the GDB General Public
-License. A copy of this license is supposed to have been given to you
-along with GDB so you can know your rights and responsibilities. It
-should be in a file named COPYING. Among other things, the copyright
-notice and this notice must be preserved on all copies.
+ This file is part of GDB.
+
+ This program 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 of the License, or
+ (at your option) any later version.
+
+ This program 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 this program. If not, see <http://www.gnu.org/licenses/>. */
+
+#if !defined (EXPRESSION_H)
+#define EXPRESSION_H 1
+
+
+#include "symtab.h" /* Needed for "struct block" type. */
+#include "doublest.h" /* Needed for DOUBLEST. */
-In other words, go ahead and share GDB, but don't try to stop
-anyone else from sharing it farther. Help stamp out software hoarding!
-*/
/* Definitions for saved C expressions. */
by the preceding opcode. */
enum exp_opcode
-{
-/* BINOP_... operate on two values computed by following subexpressions,
- replacing them by one result value. They take no immediate arguments. */
- BINOP_ADD, /* + */
- BINOP_SUB, /* - */
- BINOP_MUL, /* * */
- BINOP_DIV, /* / */
- BINOP_REM, /* % */
- BINOP_LSH, /* << */
- BINOP_RSH, /* >> */
- BINOP_AND, /* && */
- BINOP_OR, /* || */
- BINOP_LOGAND, /* & */
- BINOP_LOGIOR, /* | */
- BINOP_LOGXOR, /* ^ */
- BINOP_EQUAL, /* == */
- BINOP_NOTEQUAL, /* != */
- BINOP_LESS, /* < */
- BINOP_GTR, /* > */
- BINOP_LEQ, /* <= */
- BINOP_GEQ, /* >= */
- BINOP_REPEAT, /* @ */
- BINOP_ASSIGN, /* = */
- BINOP_COMMA, /* , */
- BINOP_SUBSCRIPT, /* x[y] */
- BINOP_EXP, /* Exponentiation */
-
-/* C++. */
- BINOP_SCOPE, /* :: */
-
- /* STRUCTOP_MEMBER is used for pointer-to-member constructs.
- X . * Y translates into X STRUCTOP_MEMBER Y. */
- STRUCTOP_MEMBER,
- /* STRUCTOP_MPTR is used for pointer-to-member constructs
- when X is a pointer instead of an aggregate. */
- STRUCTOP_MPTR,
-/* end of C++. */
-
- BINOP_END,
-
- BINOP_ASSIGN_MODIFY, /* +=, -=, *=, and so on.
- The following exp_element is another opcode,
- a BINOP_, saying how to modify.
- Then comes another BINOP_ASSIGN_MODIFY,
- making three exp_elements in total. */
-
-/* Operates on three values computed by following subexpressions. */
- TERNOP_COND, /* ?: */
-
-/* The OP_... series take immediate following arguments.
- After the arguments come another OP_... (the same one)
- so that the grouping can be recognized from the end. */
-
-/* OP_LONG is followed by a type pointer in the next exp_element
- and the long constant value in the following exp_element.
- Then comes another OP_LONG.
- Thus, the operation occupies four exp_elements. */
-
- OP_LONG,
-/* OP_DOUBLE is similar but takes a double constant instead of a long one. */
- OP_DOUBLE,
-/* OP_VAR_VALUE takes one struct symbol * in the following exp_element,
- followed by another OP_VAR_VALUE, making three exp_elements. */
- OP_VAR_VALUE,
-/* OP_LAST is followed by an integer in the next exp_element.
- The integer is zero for the last value printed,
- or it is the absolute number of a history element.
- With another OP_LAST at the end, this makes three exp_elements. */
- OP_LAST,
-/* OP_REGISTER is followed by an integer in the next exp_element.
- This is the number of a register to fetch (as an int).
- With another OP_REGISTER at the end, this makes three exp_elements. */
- OP_REGISTER,
-/* OP_INTERNALVAR is followed by an internalvar ptr in the next exp_element.
- With another OP_INTERNALVAR at the end, this makes three exp_elements. */
- OP_INTERNALVAR,
-/* OP_FUNCALL is followed by an integer in the next exp_element.
- The integer is the number of args to the function call.
- That many plus one values from following subexpressions
- are used, the first one being the function.
- The integer is followed by a repeat of OP_FUNCALL,
- making three exp_elements. */
- OP_FUNCALL,
-/* OP_STRING represents a string constant.
- Its format is the same as that of a STRUCTOP, but the string
- data is just made into a string constant when the operation
- is executed. */
- OP_STRING,
-
-/* UNOP_CAST is followed by a type pointer in the next exp_element.
- With another UNOP_CAST at the end, this makes three exp_elements.
- It casts the value of the following subexpression. */
- UNOP_CAST,
-/* UNOP_MEMVAL is followed by a type pointer in the next exp_element
- With another UNOP_MEMVAL at the end, this makes three exp_elements.
- It casts the contents of the word addressed by the value of the
- following subexpression. */
- UNOP_MEMVAL,
-/* UNOP_... operate on one value from a following subexpression
- and replace it with a result. They take no immediate arguments. */
- UNOP_NEG, /* Unary - */
- UNOP_ZEROP, /* Unary ! */
- UNOP_LOGNOT, /* Unary ~ */
- UNOP_IND, /* Unary * */
- UNOP_ADDR, /* Unary & */
- UNOP_PREINCREMENT, /* ++ before an expression */
- UNOP_POSTINCREMENT, /* ++ after an expression */
- UNOP_PREDECREMENT, /* -- before an expression */
- UNOP_POSTDECREMENT, /* -- after an expression */
- UNOP_SIZEOF, /* Unary sizeof (followed by expression) */
-
-/* STRUCTOP_... operate on a value from a following subexpression
- by extracting a structure component specified by a string
- that appears in the following exp_elements (as many as needed).
- STRUCTOP_STRUCT is used for "." and STRUCTOP_PTR for "->".
- They differ only in the error message given in case the value is
- not suitable or the structure component specified is not found.
-
- The length of the string follows in the next exp_element,
- (after the string), followed by another STRUCTOP_... code. */
- STRUCTOP_STRUCT,
- STRUCTOP_PTR,
-
-/* C++ */
- /* OP_THIS is just a placeholder for the class instance variable.
- It just comes in a tight (OP_THIS, OP_THIS) pair. */
- OP_THIS,
-
- /* OP_SCOPE surrounds a type name and a field name. The type
- name is encoded as one element, but the field name stays as
- a string, which, of course, is variable length. */
- OP_SCOPE,
-
-};
+ {
+#define OP(name) name ,
+
+#include "std-operator.def"
+
+ /* First extension operator. Individual language modules define extra
+ operators in *.def include files below with numbers higher than
+ OP_EXTENDED0. */
+ OP (OP_EXTENDED0)
+
+/* Language specific operators. */
+#include "ada-operator.def"
+
+#undef OP
+
+ /* Existing only to swallow the last comma (',') from last .inc file. */
+ OP_UNUSED_LAST
+ };
union exp_element
-{
- enum exp_opcode opcode;
- struct symbol *symbol;
- long longconst;
- double doubleconst;
- char string;
- struct type *type;
- struct internalvar *internalvar;
-};
+ {
+ enum exp_opcode opcode;
+ struct symbol *symbol;
+ LONGEST longconst;
+ DOUBLEST doubleconst;
+ gdb_byte decfloatconst[16];
+ /* Really sizeof (union exp_element) characters (or less for the last
+ element of a string). */
+ char string;
+ struct type *type;
+ struct internalvar *internalvar;
+ const struct block *block;
+ struct objfile *objfile;
+ };
struct expression
-{
- int nelts;
- union exp_element elts[1];
-};
-
-struct expression *parse_c_expression ();
-struct expression *parse_c_1 ();
+ {
+ const struct language_defn *language_defn; /* language it was
+ entered in. */
+ struct gdbarch *gdbarch; /* architecture it was parsed in. */
+ int nelts;
+ union exp_element elts[1];
+ };
+
+typedef gdb::unique_xmalloc_ptr<expression> expression_up;
+
+/* Macros for converting between number of expression elements and bytes
+ to store that many expression elements. */
+
+#define EXP_ELEM_TO_BYTES(elements) \
+ ((elements) * sizeof (union exp_element))
+#define BYTES_TO_EXP_ELEM(bytes) \
+ (((bytes) + sizeof (union exp_element) - 1) / sizeof (union exp_element))
+
+/* From parse.c */
+
+extern expression_up parse_expression (const char *);
+
+extern expression_up parse_expression_with_language (const char *string,
+ enum language lang);
+
+extern struct type *parse_expression_for_completion (const char *, char **,
+ enum type_code *);
+
+extern expression_up parse_exp_1 (const char **, CORE_ADDR pc,
+ const struct block *, int);
+
+/* For use by parsers; set if we want to parse an expression and
+ attempt completion. */
+extern int parse_completion;
+
+/* The innermost context required by the stack and register variables
+ we've encountered so far. To use this, set it to NULL, then call
+ parse_<whatever>, then look at it. */
+extern const struct block *innermost_block;
+
+/* From eval.c */
+
+/* Values of NOSIDE argument to eval_subexp. */
+
+enum noside
+ {
+ EVAL_NORMAL,
+ EVAL_SKIP, /* Only effect is to increment pos. */
+ EVAL_AVOID_SIDE_EFFECTS /* Don't modify any variables or
+ call any functions. The value
+ returned will have the correct
+ type, and will have an
+ approximately correct lvalue
+ type (inaccuracy: anything that is
+ listed as being in a register in
+ the function in which it was
+ declared will be lval_register).
+ Ideally this would not even read
+ target memory, but currently it
+ does in many situations. */
+ };
+
+extern struct value *evaluate_subexp_standard
+ (struct type *, struct expression *, int *, enum noside);
+
+/* From expprint.c */
+
+extern void print_expression (struct expression *, struct ui_file *);
+
+extern const char *op_name (struct expression *exp, enum exp_opcode opcode);
+
+extern const char *op_string (enum exp_opcode);
+
+extern void dump_raw_expression (struct expression *,
+ struct ui_file *, const char *);
+extern void dump_prefix_expression (struct expression *, struct ui_file *);
+
+/* In an OP_RANGE expression, either bound could be empty, indicating
+ that its value is by default that of the corresponding bound of the
+ array or string. So we have four sorts of subrange. This
+ enumeration type is to identify this. */
+
+enum range_type
+ {
+ BOTH_BOUND_DEFAULT, /* "(:)" */
+ LOW_BOUND_DEFAULT, /* "(:high)" */
+ HIGH_BOUND_DEFAULT, /* "(low:)" */
+ NONE_BOUND_DEFAULT /* "(low:high)" */
+ };
+
+#endif /* !defined (EXPRESSION_H) */
projects / deliverable / binutils-gdb.git / blobdiff