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authorStan Shebs <shebs@codesourcery.com>1999-04-16 01:34:07 +0000
committerStan Shebs <shebs@codesourcery.com>1999-04-16 01:34:07 +0000
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-/* Definitions for expressions stored in reversed prefix form, for GDB.
- Copyright 1986, 1989, 1992, 1994 Free Software Foundation, Inc.
-
-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 2 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, write to the Free Software
-Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
-
-#if !defined (EXPRESSION_H)
-#define EXPRESSION_H 1
-
-#ifdef __STDC__
-struct block; /* Forward declaration for prototypes */
-#endif
-
-/* Definitions for saved C expressions. */
-
-/* An expression is represented as a vector of union exp_element's.
- Each exp_element is an opcode, except that some opcodes cause
- the following exp_element to be treated as a long or double constant
- or as a variable. The opcodes are obeyed, using a stack for temporaries.
- The value is left on the temporary stack at the end. */
-
-/* When it is necessary to include a string,
- it can occupy as many exp_elements as it needs.
- We find the length of the string using strlen,
- divide to find out how many exp_elements are used up,
- and skip that many. Strings, like numbers, are indicated
- by the preceding opcode. */
-
-enum exp_opcode
-{
- /* Used when it's necessary to pass an opcode which will be ignored,
- or to catch uninitialized values. */
- OP_NULL,
-
-/* 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_MOD, /* mod (Knuth 1.2.4) */
- BINOP_LSH, /* << */
- BINOP_RSH, /* >> */
- BINOP_LOGICAL_AND, /* && */
- BINOP_LOGICAL_OR, /* || */
- BINOP_BITWISE_AND, /* & */
- BINOP_BITWISE_IOR, /* | */
- BINOP_BITWISE_XOR, /* ^ */
- 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_MIN, /* <? */
- BINOP_MAX, /* >? */
- 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++. */
-
- /* For Modula-2 integer division DIV */
- BINOP_INTDIV,
-
- 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. */
-
- /* Modula-2 standard (binary) procedures */
- BINOP_VAL,
- BINOP_INCL,
- BINOP_EXCL,
-
- /* Concatenate two operands, such as character strings or bitstrings.
- If the first operand is a integer expression, then it means concatenate
- the second operand with itself that many times. */
- BINOP_CONCAT,
-
- /* For Chill and Pascal. */
- BINOP_IN, /* Returns 1 iff ARG1 IN ARG2. */
-
- /* This must be the highest BINOP_ value, for expprint.c. */
- BINOP_END,
-
- /* Operates on three values computed by following subexpressions. */
- TERNOP_COND, /* ?: */
-
- /* A sub-string/sub-array. Chill syntax: OP1(OP2:OP3).
- Return elements OP2 through OP3 of OP1. */
- TERNOP_SLICE,
-
- /* A sub-string/sub-array. Chill syntax: OP1(OP2 UP OP3).
- Return OP3 elements of OP1, starting with element OP2. */
- TERNOP_SLICE_COUNT,
-
- /* Multidimensional subscript operator, such as Modula-2 x[a,b,...].
- The dimensionality is encoded in the operator, like the number of
- function arguments in OP_FUNCALL, I.E. <OP><dimension><OP>.
- The value of the first following subexpression is subscripted
- by each of the next following subexpressions, one per dimension. */
- MULTI_SUBSCRIPT,
-
- /* 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. */
- OP_DOUBLE,
-
- /* OP_VAR_VALUE takes one struct block * in the following element,
- and one struct symbol * in the following exp_element, followed by
- another OP_VAR_VALUE, making four exp_elements. If the block is
- non-NULL, evaluate the symbol relative to the innermost frame
- executing in that block; if the block is NULL use the selected frame. */
- 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,
-
- /* This is EXACTLY like OP_FUNCALL but is semantically different.
- In F77, array subscript expressions, substring expressions
- and function calls are all exactly the same syntactically. They may
- only be dismabiguated at runtime. Thus this operator, which
- indicates that we have found something of the form <name> ( <stuff> ) */
- OP_F77_UNDETERMINED_ARGLIST,
-
- /* The following OP is a special one, it introduces a F77 complex
- literal. It is followed by exactly two args that are doubles. */
- OP_COMPLEX,
-
- /* 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,
-
- /* OP_BITSTRING represents a packed bitstring constant.
- Its format is the same as that of a STRUCTOP, but the bitstring
- data is just made into a bitstring constant when the operation
- is executed. */
- OP_BITSTRING,
-
- /* OP_ARRAY creates an array constant out of the following subexpressions.
- It is followed by two exp_elements, the first containing an integer
- that is the lower bound of the array and the second containing another
- integer that is the upper bound of the array. The second integer is
- followed by a repeat of OP_ARRAY, making four exp_elements total.
- The bounds are used to compute the number of following subexpressions
- to consume, as well as setting the bounds in the created array constant.
- The type of the elements is taken from the type of the first subexp,
- and they must all match. */
- OP_ARRAY,
-
- /* 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_LOGICAL_NOT, /* Unary ! */
- UNOP_COMPLEMENT, /* 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) */
-
- UNOP_PLUS, /* Unary plus */
-
- UNOP_CAP, /* Modula-2 standard (unary) procedures */
- UNOP_CHR,
- UNOP_ORD,
- UNOP_ABS,
- UNOP_FLOAT,
- UNOP_HIGH,
- UNOP_MAX,
- UNOP_MIN,
- UNOP_ODD,
- UNOP_TRUNC,
-
- /* Chill builtin functions. */
- UNOP_LOWER, UNOP_UPPER, UNOP_LENGTH,
-
- OP_BOOL, /* Modula-2 builtin BOOLEAN type */
- OP_M2_STRING, /* Modula-2 string constants */
-
- /* 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 the opcode, followed by
- BYTES_TO_EXP_ELEM(length) elements containing the data of the
- string, followed by the length again and the opcode again. */
-
- STRUCTOP_STRUCT,
- STRUCTOP_PTR,
-
-/* start-sanitize-gm */
-#ifdef GENERAL_MAGIC_HACKS
- /* STRUCTOP_FIELD is for handling field access for Magic Cap dynamic objects.
- */
- STRUCTOP_FIELD,
-#endif /* GENERAL_MAGIC_HACKS */
-/* end-sanitize-gm */
-
- /* 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,
-
- /* Used to represent named structure field values in brace initializers
- (or tuples as they are called in Chill).
- The gcc C syntax is NAME:VALUE or .NAME=VALUE, the Chill syntax is
- .NAME:VALUE. Multiple labels (as in the Chill syntax
- .NAME1,.NAME2:VALUE) is represented as if it were
- .NAME1:(.NAME2:VALUE) (though that is not valid Chill syntax).
-
- The NAME is represented as for STRUCTOP_STRUCT; VALUE follows. */
- OP_LABELED,
-
- /* OP_TYPE is for parsing types, and used with the "ptype" command
- so we can look up types that are qualified by scope, either with
- the GDB "::" operator, or the Modula-2 '.' operator. */
- OP_TYPE,
-
- /* An un-looked-up identifier. */
- OP_NAME,
-
- /* An unparsed expression. Used for Scheme (for now at least) */
- OP_EXPRSTRING
-};
-
-union exp_element
-{
- enum exp_opcode opcode;
- struct symbol *symbol;
- LONGEST longconst;
- double doubleconst;
- /* Really sizeof (union exp_element) characters (or less for the last
- element of a string). */
- char string;
- struct type *type;
- struct internalvar *internalvar;
- struct block *block;
-};
-
-struct expression
-{
- const struct language_defn *language_defn; /* language it was entered in */
- int nelts;
- union exp_element elts[1];
-};
-
-/* 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 struct expression *parse_expression PARAMS ((char *));
-
-extern struct expression *parse_exp_1 PARAMS ((char **, struct block *, int));
-
-/* 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 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). */
-};
-
-extern struct value* evaluate_subexp_standard
-PARAMS ((struct type *, struct expression *, int*, enum noside));
-
-/* From expprint.c */
-
-extern void print_expression PARAMS ((struct expression *, GDB_FILE *));
-
-extern char *op_string PARAMS ((enum exp_opcode));
-
-/* To enable dumping of all parsed expressions in a human readable
- form, define DEBUG_EXPRESSIONS. This is a compile time constant
- at the moment, since it's not clear that this feature is important
- enough to include by default. */
-
-#ifdef DEBUG_EXPRESSIONS
-extern void dump_expression PARAMS ((struct expression *, GDB_FILE *, char *));
-#define DUMP_EXPRESSION(exp,file,note) dump_expression ((exp), (file), (note))
-#else
-#define DUMP_EXPRESSION(exp,file,note) /* Null expansion */
-#endif /* DEBUG_EXPRESSIONS */
-
-#endif /* !defined (EXPRESSION_H) */