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- /* Definitions for values of C expressions, for GDB.
- Copyright 1986, 1987, 1989, 1992 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- #if !defined (VALUE_H)
- #define VALUE_H 1
-
- /*
- * The structure which defines the type of a value. It should never
- * be possible for a program lval value to survive over a call to the inferior
- * (ie to be put into the history list or an internal variable).
- */
- enum lval_type {
- /* Not an lval. */
- not_lval,
- /* In memory. Could be a saved register. */
- lval_memory,
- /* In a register. */
- lval_register,
- /* In a gdb internal variable. */
- lval_internalvar,
- /* Part of a gdb internal variable (structure field). */
- lval_internalvar_component,
- /* In a register series in a frame not the current one, which may have been
- partially saved or saved in different places (otherwise would be
- lval_register or lval_memory). */
- lval_reg_frame_relative
- };
-
- struct value
- {
- /* Type of value; either not an lval, or one of the various
- different possible kinds of lval. */
- enum lval_type lval;
- /* Location of value (if lval). */
- union
- {
- /* Address in inferior or byte of registers structure. */
- CORE_ADDR address;
- /* Pointer to interrnal variable. */
- struct internalvar *internalvar;
- /* Number of register. Only used with
- lval_reg_frame_relative. */
- int regnum;
- } location;
- /* Describes offset of a value within lval a structure in bytes. */
- int offset;
- /* Only used for bitfields; number of bits contained in them. */
- int bitsize;
- /* Only used for bitfields; position of start of field. */
- int bitpos;
- /* Frame value is relative to. In practice, this address is only
- used if the value is stored in several registers in other than
- the current frame, and these registers have not all been saved
- at the same place in memory. This will be described in the
- lval enum above as "lval_reg_frame_relative". */
- CORE_ADDR frame_addr;
- /* Type of the value. */
- struct type *type;
- /* Values are stored in a chain, so that they can be deleted
- easily over calls to the inferior. Values assigned to internal
- variables or put into the value history are taken off this
- list. */
- struct value *next;
- /* If an lval is forced to repeat, a new value is created with
- these fields set. The new value is not an lval. */
- short repeated;
- short repetitions;
- /* Register number if the value is from a register. Is not kept
- if you take a field of a structure that is stored in a
- register. Shouldn't it be? */
- short regno;
- /* If zero, contents of this value are in the contents field.
- If nonzero, contents are in inferior memory at address
- in the location.address field plus the offset field
- (and the lval field should be lval_memory). */
- char lazy;
- /* If nonzero, this is the value of a variable which does not
- actually exist in the program. */
- char optimized_out;
- /* Actual contents of the value. For use of this value; setting
- it uses the stuff above. Not valid if lazy is nonzero.
- Target byte-order. We force it to be aligned properly for any
- possible value. */
- union {
- long contents[1];
- double force_double_align;
- #ifdef LONG_LONG
- long long force_longlong_align;
- #endif
- } aligner;
-
- };
-
- typedef struct value *value;
-
- #define VALUE_TYPE(val) (val)->type
- #define VALUE_LAZY(val) (val)->lazy
- /* VALUE_CONTENTS and VALUE_CONTENTS_RAW both return the address of
- the gdb buffer used to hold a copy of the contents of the lval.
- VALUE_CONTENTS is used when the contents of the buffer are needed --
- it uses value_fetch_lazy() to load the buffer from the process being
- debugged if it hasn't already been loaded. VALUE_CONTENTS_RAW is
- used when data is being stored into the buffer, or when it is
- certain that the contents of the buffer are valid. */
- #define VALUE_CONTENTS_RAW(val) ((char *) (val)->aligner.contents)
- #define VALUE_CONTENTS(val) ((void)(VALUE_LAZY(val) && value_fetch_lazy(val)),\
- VALUE_CONTENTS_RAW(val))
- extern int
- value_fetch_lazy PARAMS ((value val));
-
- #define VALUE_LVAL(val) (val)->lval
- #define VALUE_ADDRESS(val) (val)->location.address
- #define VALUE_INTERNALVAR(val) (val)->location.internalvar
- #define VALUE_FRAME_REGNUM(val) ((val)->location.regnum)
- #define VALUE_FRAME(val) ((val)->frame_addr)
- #define VALUE_OFFSET(val) (val)->offset
- #define VALUE_BITSIZE(val) (val)->bitsize
- #define VALUE_BITPOS(val) (val)->bitpos
- #define VALUE_NEXT(val) (val)->next
- #define VALUE_REPEATED(val) (val)->repeated
- #define VALUE_REPETITIONS(val) (val)->repetitions
- #define VALUE_REGNO(val) (val)->regno
- #define VALUE_OPTIMIZED_OUT(val) ((val)->optimized_out)
-
- /* Convert a REF to the object referenced. */
-
- #define COERCE_REF(arg) \
- { if (TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_REF) \
- arg = value_at_lazy (TYPE_TARGET_TYPE (VALUE_TYPE (arg)), \
- unpack_long (VALUE_TYPE (arg), \
- VALUE_CONTENTS (arg)));}
-
- /* If ARG is an array, convert it to a pointer.
- If ARG is an enum, convert it to an integer.
- If ARG is a function, convert it to a function pointer.
-
- References are dereferenced. */
-
- #define COERCE_ARRAY(arg) \
- { COERCE_REF(arg); \
- if (VALUE_REPEATED (arg) \
- || TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_ARRAY) \
- arg = value_coerce_array (arg); \
- if (TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_FUNC) \
- arg = value_coerce_function (arg); \
- if (TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_ENUM) \
- arg = value_cast (builtin_type_unsigned_int, arg); \
- }
-
- /* If ARG is an enum, convert it to an integer. */
-
- #define COERCE_ENUM(arg) \
- { if (TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_REF) \
- arg = value_ind (arg); \
- if (TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_ENUM) \
- arg = value_cast (builtin_type_unsigned_int, arg); \
- }
-
- /* Internal variables (variables for convenience of use of debugger)
- are recorded as a chain of these structures. */
-
- struct internalvar
- {
- struct internalvar *next;
- char *name;
- value value;
- };
-
-
- #include "symtab.h"
- #include "gdbtypes.h"
- #include "expression.h"
-
- #ifdef __STDC__
- struct frame_info;
- #endif
-
- extern void
- print_address_demangle PARAMS ((CORE_ADDR, FILE *, int));
-
- extern LONGEST
- value_as_long PARAMS ((value val));
-
- extern double
- value_as_double PARAMS ((value val));
-
- extern CORE_ADDR
- value_as_pointer PARAMS ((value val));
-
- extern LONGEST
- unpack_long PARAMS ((struct type *type, char *valaddr));
-
- extern double
- unpack_double PARAMS ((struct type *type, char *valaddr, int *invp));
-
- extern CORE_ADDR
- unpack_pointer PARAMS ((struct type *type, char *valaddr));
-
- extern long
- unpack_field_as_long PARAMS ((struct type *type, char *valaddr,
- int fieldno));
-
- extern value
- value_from_longest PARAMS ((struct type *type, LONGEST num));
-
- extern value
- value_from_double PARAMS ((struct type *type, double num));
-
- extern value
- value_at PARAMS ((struct type *type, CORE_ADDR addr));
-
- extern value
- value_at_lazy PARAMS ((struct type *type, CORE_ADDR addr));
-
- /* FIXME: Assumes equivalence of "struct frame_info *" and "FRAME" */
- extern value
- value_from_register PARAMS ((struct type *type, int regnum,
- struct frame_info * frame));
-
- extern value
- value_of_variable PARAMS ((struct symbol *var));
-
- extern value
- value_of_register PARAMS ((int regnum));
-
- /* FIXME: Assumes equivalence of "struct frame_info *" and "FRAME" */
- extern value
- read_var_value PARAMS ((struct symbol *var, struct frame_info *frame));
-
- /* FIXME: Assumes equivalence of "struct frame_info *" and "FRAME" */
- extern value
- locate_var_value PARAMS ((struct symbol *var, struct frame_info *frame));
-
- extern value
- allocate_value PARAMS ((struct type *type));
-
- extern value
- allocate_repeat_value PARAMS ((struct type *type, int count));
-
- extern value
- value_mark PARAMS ((void));
-
- extern void
- value_free_to_mark PARAMS ((value mark));
-
- extern value
- value_string PARAMS ((char *ptr, int len));
-
- extern value
- value_binop PARAMS ((value arg1, value arg2, enum exp_opcode op));
-
- extern value
- value_add PARAMS ((value arg1, value arg2));
-
- extern value
- value_sub PARAMS ((value arg1, value arg2));
-
- extern value
- value_coerce_array PARAMS ((value arg1));
-
- extern value
- value_coerce_function PARAMS ((value arg1));
-
- extern value
- value_ind PARAMS ((value arg1));
-
- extern value
- value_addr PARAMS ((value arg1));
-
- extern value
- value_assign PARAMS ((value toval, value fromval));
-
- extern value
- value_neg PARAMS ((value arg1));
-
- extern value
- value_lognot PARAMS ((value arg1));
-
- extern value
- value_struct_elt PARAMS ((value *argp, value *args, char *name,
- int *static_memfuncp, char *err));
-
- extern value
- value_struct_elt_for_reference PARAMS ((struct type *domain,
- int offset,
- struct type *curtype,
- char *name,
- struct type *intype));
-
- extern value
- value_field PARAMS ((value arg1, int fieldno));
-
- extern value
- value_primitive_field PARAMS ((value arg1, int offset, int fieldno,
- struct type *arg_type));
-
- extern value
- value_cast PARAMS ((struct type *type, value arg2));
-
- extern value
- value_zero PARAMS ((struct type *type, enum lval_type lv));
-
- extern value
- value_repeat PARAMS ((value arg1, int count));
-
- extern value
- value_subscript PARAMS ((value array, value idx));
-
- extern value
- value_from_vtable_info PARAMS ((value arg, struct type *type));
-
- extern value
- value_being_returned PARAMS ((struct type *valtype,
- char retbuf[REGISTER_BYTES],
- int struct_return));
-
- extern int
- using_struct_return PARAMS ((value function, CORE_ADDR funcaddr,
- struct type *value_type, int gcc_p));
-
- extern void
- set_return_value PARAMS ((value val));
-
- extern value
- evaluate_expression PARAMS ((struct expression *exp));
-
- extern value
- evaluate_type PARAMS ((struct expression *exp));
-
- extern value
- parse_and_eval PARAMS ((char *exp));
-
- extern value
- parse_to_comma_and_eval PARAMS ((char **expp));
-
- extern struct type *
- parse_and_eval_type PARAMS ((char *p, int length));
-
- extern CORE_ADDR
- parse_and_eval_address PARAMS ((char *exp));
-
- extern CORE_ADDR
- parse_and_eval_address_1 PARAMS ((char **expptr));
-
- extern value
- access_value_history PARAMS ((int num));
-
- extern value
- value_of_internalvar PARAMS ((struct internalvar *var));
-
- extern void
- set_internalvar PARAMS ((struct internalvar *var, value val));
-
- extern void
- set_internalvar_component PARAMS ((struct internalvar *var, int offset,
- int bitpos, int bitsize,
- value newvalue));
-
- extern struct internalvar *
- lookup_internalvar PARAMS ((char *name));
-
- extern int
- value_equal PARAMS ((value arg1, value arg2));
-
- extern int
- value_less PARAMS ((value arg1, value arg2));
-
- extern int
- value_zerop PARAMS ((value arg1));
-
- /* C++ */
-
- extern value
- value_of_this PARAMS ((int complain));
-
- extern value
- value_x_binop PARAMS ((value arg1, value arg2, enum exp_opcode op,
- enum exp_opcode otherop));
-
- extern value
- value_x_unop PARAMS ((value arg1, enum exp_opcode op));
-
- extern value
- value_fn_field PARAMS ((struct fn_field *f, int j));
-
- extern value
- value_virtual_fn_field PARAMS ((value arg1, struct fn_field *f, int j,
- struct type *type));
-
- extern int
- binop_user_defined_p PARAMS ((enum exp_opcode op, value arg1, value arg2));
-
- extern int
- unop_user_defined_p PARAMS ((enum exp_opcode op, value arg1));
-
- extern int
- typecmp PARAMS ((int staticp, struct type *t1[], value t2[]));
-
- extern int
- destructor_name_p PARAMS ((const char *name, const struct type *type));
-
- #define value_free(val) free ((PTR)val)
-
- extern void
- free_all_values PARAMS ((void));
-
- extern void
- release_value PARAMS ((value val));
-
- extern int
- record_latest_value PARAMS ((value val));
-
- extern void
- registers_changed PARAMS ((void));
-
- extern void
- read_register_bytes PARAMS ((int regbyte, char *myaddr, int len));
-
- extern void
- write_register_bytes PARAMS ((int regbyte, char *myaddr, int len));
-
- extern void
- read_register_gen PARAMS ((int regno, char *myaddr));
-
- extern CORE_ADDR
- read_register PARAMS ((int regno));
-
- extern void
- write_register PARAMS ((int regno, int val));
-
- extern void
- supply_register PARAMS ((int regno, char *val));
-
- /* FIXME: Assumes equivalence of "struct frame_info *" and "FRAME" */
- extern void
- get_saved_register PARAMS ((char *raw_buffer, int *optimized,
- CORE_ADDR *addrp, struct frame_info *frame,
- int regnum, enum lval_type *lval));
-
- extern void
- modify_field PARAMS ((char *addr, int fieldval, int bitpos, int bitsize));
-
- extern void
- type_print PARAMS ((struct type *type, char *varstring, FILE *stream,
- int show));
-
- extern void
- type_print_1 PARAMS ((struct type *type, char *varstring, FILE *stream,
- int show, int level));
-
- /* Possibilities for prettyprint parameters to routines which print
- things. */
- enum val_prettyprint {
- Val_no_prettyprint = 0,
- Val_prettyprint,
- /* Use the default setting which the user has specified. */
- Val_pretty_default
- };
-
- extern char *
- baseclass_addr PARAMS ((struct type *type, int index, char *valaddr,
- value *valuep, int *errp));
-
- extern void
- print_floating PARAMS ((char *valaddr, struct type *type, FILE *stream));
-
- extern int
- value_print PARAMS ((value val, FILE *stream, int format,
- enum val_prettyprint pretty));
-
- extern int
- val_print PARAMS ((struct type *type, char *valaddr, CORE_ADDR address,
- FILE *stream, int format, int deref_ref,
- int recurse, enum val_prettyprint pretty));
-
- /* FIXME: Assumes equivalence of "struct frame_info *" and "FRAME" */
- extern void
- print_variable_value PARAMS ((struct symbol *var, struct frame_info *frame,
- FILE *stream));
-
- extern value
- value_arg_coerce PARAMS ((value));
-
- extern int
- check_field PARAMS ((value, const char *));
-
- extern void
- typedef_print PARAMS ((struct type *type, struct symbol *new, FILE *stream));
-
- extern char *
- internalvar_name PARAMS ((struct internalvar *var));
-
- extern void
- clear_value_history PARAMS ((void));
-
- extern void
- clear_internalvars PARAMS ((void));
-
- /* From values.c */
-
- extern value
- value_copy PARAMS ((value));
-
- /* From valops.c */
-
- extern value
- call_function_by_hand PARAMS ((value, int, value *));
-
- #endif /* !defined (VALUE_H) */
-