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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
commit071ea11e85eb9d529cc5eb3d35f6247466a21b99 (patch)
tree5deda65b8d7b04d1f4cbc534c3206d328e1267ec /gdb/value.h
parent1730ec6b1848f0f32154277f788fb29f88d8475b (diff)
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Initial creation of sourceware repository
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diff --git a/gdb/value.h b/gdb/value.h
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-/* Definitions for values of C expressions, for GDB.
- Copyright 1986, 1987, 1989, 1992, 1993, 1994, 1995, 1996
- 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 (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;
- /* Is it modifiable? Only relevant if lval != not_lval. */
- int modifiable;
- /* Location of value (if lval). */
- union
- {
- /* Address in inferior or byte of registers structure. */
- CORE_ADDR address;
- /* Pointer to internal variable. */
- struct internalvar *internalvar;
- /* Number of register. Only used with
- lval_reg_frame_relative. */
- int regnum;
- } location;
- /* Describes offset of a value within lval of a structure in bytes.
- This is used in retrieving contents from target memory. [Note also
- the member embedded_offset below.] */
- int offset;
- /* Only used for bitfields; number of bits contained in them. */
- int bitsize;
- /* Only used for bitfields; position of start of field.
- For BITS_BIG_ENDIAN=0 targets, it is the position of the LSB.
- For BITS_BIG_ENDIAN=1 targets, it is the position of the MSB. */
- 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;
- /* Type of the enclosing object if this is an embedded subobject.
- The member embedded_offset gives the real position of the subobject
- if type is not the same as enclosing_type.
-
- If the type field is a pointer type, then enclosing_type is
- a pointer type pointing to the real (enclosing) type of the target
- object. */
- struct type *enclosing_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;
-
- /* ??? When is this used? */
- union {
- CORE_ADDR memaddr;
- char *myaddr;
- } substring_addr;
-
- /* 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;
- /* If this value represents an object that is embedded inside a
- larger object (e.g., a base subobject in C++), this gives the
- offset (in bytes) from the start of the contents buffer where
- the embedded object begins. This is required because some C++
- runtime implementations lay out objects (especially virtual bases
- with possibly negative offsets to ancestors).
- Note: This may be positive or negative! Also note that this offset
- is not used when retrieving contents from target memory; the entire
- enclosing object has to be retrieved always, and the offset for
- that is given by the member offset above. */
- int embedded_offset;
- /* If this value represents a pointer to an object that is embedded
- in another object, this gives the embedded_offset of the object
- that is pointed to. */
- int pointed_to_offset;
- /* The BFD section associated with this value. */
- asection *bfd_section;
- /* 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. Note that a value therefore extends beyond
- what is declared here. */
- union {
- long contents[1];
- double force_double_align;
- LONGEST force_longlong_align;
- char *literal_data;
- } aligner;
- /* Do not add any new members here -- contents above will trash them */
- };
-
-typedef struct value *value_ptr;
-
-#define VALUE_TYPE(val) (val)->type
-#define VALUE_ENCLOSING_TYPE(val) (val)->enclosing_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.
- Note: The contents pointer is adjusted by the offset required to
- get to the real subobject, if the value happens to represent
- something embedded in a larger run-time object. */
-
-#define VALUE_CONTENTS_RAW(val) ((char *) (val)->aligner.contents + (val)->embedded_offset)
-#define VALUE_CONTENTS(val) ((void)(VALUE_LAZY(val) && value_fetch_lazy(val)),\
- VALUE_CONTENTS_RAW(val))
-
-/* The ALL variants of the above two macros do not adjust the returned
- pointer by the embedded_offset value. */
-
-#define VALUE_CONTENTS_ALL_RAW(val) ((char *) (val)->aligner.contents)
-#define VALUE_CONTENTS_ALL(val) ((void) (VALUE_LAZY(val) && value_fetch_lazy(val)),\
- VALUE_CONTENTS_ALL_RAW(val))
-
-
-extern int value_fetch_lazy PARAMS ((value_ptr 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_REGNO(val) (val)->regno
-#define VALUE_OPTIMIZED_OUT(val) ((val)->optimized_out)
-#define VALUE_EMBEDDED_OFFSET(val) ((val)->embedded_offset)
-#define VALUE_POINTED_TO_OFFSET(val) ((val)->pointed_to_offset)
-#define VALUE_BFD_SECTION(val) ((val)->bfd_section)
-
-/* Convert a REF to the object referenced. */
-
-#define COERCE_REF(arg) \
-do { struct type *value_type_arg_tmp = check_typedef (VALUE_TYPE (arg));\
- if (TYPE_CODE (value_type_arg_tmp) == TYPE_CODE_REF) \
- arg = value_at_lazy (TYPE_TARGET_TYPE (value_type_arg_tmp), \
- unpack_long (VALUE_TYPE (arg), \
- VALUE_CONTENTS (arg)), \
- VALUE_BFD_SECTION (arg)); \
- } while (0)
-
-/* 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) \
-do { COERCE_REF(arg); \
- if (current_language->c_style_arrays \
- && 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); \
-} while (0)
-
-#define COERCE_NUMBER(arg) \
- do { COERCE_ARRAY(arg); COERCE_ENUM(arg); } while (0)
-
-#define COERCE_VARYING_ARRAY(arg, real_arg_type) \
-{ if (chill_varying_type (real_arg_type)) \
- arg = varying_to_slice (arg), real_arg_type = VALUE_TYPE (arg); }
-
-/* If ARG is an enum, convert it to an integer. */
-
-#define COERCE_ENUM(arg) { \
- if (TYPE_CODE (check_typedef (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_ptr value;
-};
-
-/* Pointer to member function. Depends on compiler implementation. */
-
-#define METHOD_PTR_IS_VIRTUAL(ADDR) ((ADDR) & 0x80000000)
-#define METHOD_PTR_FROM_VOFFSET(OFFSET) (0x80000000 + (OFFSET))
-#define METHOD_PTR_TO_VOFFSET(ADDR) (~0x80000000 & (ADDR))
-
-
-#include "symtab.h"
-#include "gdbtypes.h"
-#include "expression.h"
-
-#ifdef __STDC__
-struct frame_info;
-struct fn_field;
-#endif
-
-extern void
-print_address_demangle PARAMS ((CORE_ADDR, GDB_FILE *, int));
-
-extern LONGEST value_as_long PARAMS ((value_ptr val));
-
-extern DOUBLEST value_as_double PARAMS ((value_ptr val));
-
-extern CORE_ADDR value_as_pointer PARAMS ((value_ptr val));
-
-extern LONGEST unpack_long PARAMS ((struct type *type, char *valaddr));
-
-extern DOUBLEST unpack_double PARAMS ((struct type *type, char *valaddr,
- int *invp));
-
-extern CORE_ADDR unpack_pointer PARAMS ((struct type *type, char *valaddr));
-
-extern LONGEST unpack_field_as_long PARAMS ((struct type *type, char *valaddr,
- int fieldno));
-
-extern value_ptr value_from_longest PARAMS ((struct type *type, LONGEST num));
-
-extern value_ptr value_from_double PARAMS ((struct type *type, DOUBLEST num));
-
-extern value_ptr value_at PARAMS ((struct type *type, CORE_ADDR addr, asection *sect));
-
-extern value_ptr value_at_lazy PARAMS ((struct type *type, CORE_ADDR addr, asection *sect));
-
-extern value_ptr value_from_register PARAMS ((struct type *type, int regnum,
- struct frame_info * frame));
-
-extern value_ptr value_of_variable PARAMS ((struct symbol *var,
- struct block *b));
-
-extern value_ptr value_of_register PARAMS ((int regnum));
-
-extern int symbol_read_needs_frame PARAMS ((struct symbol *));
-
-extern value_ptr read_var_value PARAMS ((struct symbol *var,
- struct frame_info *frame));
-
-extern value_ptr locate_var_value PARAMS ((struct symbol *var,
- struct frame_info *frame));
-
-extern value_ptr allocate_value PARAMS ((struct type *type));
-
-extern value_ptr allocate_repeat_value PARAMS ((struct type *type, int count));
-
-extern value_ptr value_mark PARAMS ((void));
-
-extern void value_free_to_mark PARAMS ((value_ptr mark));
-
-extern value_ptr value_string PARAMS ((char *ptr, int len));
-extern value_ptr value_bitstring PARAMS ((char *ptr, int len));
-
-extern value_ptr value_array PARAMS ((int lowbound, int highbound,
- value_ptr *elemvec));
-
-extern value_ptr value_concat PARAMS ((value_ptr arg1, value_ptr arg2));
-
-extern value_ptr value_binop PARAMS ((value_ptr arg1, value_ptr arg2,
- enum exp_opcode op));
-
-extern value_ptr value_add PARAMS ((value_ptr arg1, value_ptr arg2));
-
-extern value_ptr value_sub PARAMS ((value_ptr arg1, value_ptr arg2));
-
-extern value_ptr value_coerce_array PARAMS ((value_ptr arg1));
-
-extern value_ptr value_coerce_function PARAMS ((value_ptr arg1));
-
-extern value_ptr value_ind PARAMS ((value_ptr arg1));
-
-extern value_ptr value_addr PARAMS ((value_ptr arg1));
-
-extern value_ptr value_assign PARAMS ((value_ptr toval, value_ptr fromval));
-
-extern value_ptr value_neg PARAMS ((value_ptr arg1));
-
-extern value_ptr value_complement PARAMS ((value_ptr arg1));
-
-extern value_ptr value_struct_elt PARAMS ((value_ptr *argp, value_ptr *args,
- char *name,
- int *static_memfuncp, char *err));
-
-extern value_ptr value_struct_elt_for_reference PARAMS ((struct type *domain,
- int offset,
- struct type *curtype,
- char *name,
- struct type *intype));
-
-extern value_ptr value_static_field PARAMS ((struct type *type, int fieldno));
-
-extern struct fn_field *
-value_find_oload_method_list PARAMS ((value_ptr *, char *, int, int *, int *, struct type **, int *));
-
-extern value_ptr value_field PARAMS ((value_ptr arg1, int fieldno));
-
-extern value_ptr value_primitive_field PARAMS ((value_ptr arg1, int offset,
- int fieldno,
- struct type *arg_type));
-
-extern struct type *
-value_rtti_type PARAMS ((value_ptr, int *, int *, int *));
-
-extern struct type *
-value_rtti_target_type PARAMS ((value_ptr, int *, int *, int *));
-
-extern value_ptr
-value_full_object PARAMS ((value_ptr, struct type *, int, int, int));
-
-extern value_ptr value_cast PARAMS ((struct type *type, value_ptr arg2));
-
-extern value_ptr value_zero PARAMS ((struct type *type, enum lval_type lv));
-
-extern value_ptr value_repeat PARAMS ((value_ptr arg1, int count));
-
-extern value_ptr value_subscript PARAMS ((value_ptr array, value_ptr idx));
-
-extern value_ptr value_from_vtable_info PARAMS ((value_ptr arg,
- struct type *type));
-
-extern value_ptr value_being_returned PARAMS ((struct type *valtype,
- char retbuf[REGISTER_BYTES],
- int struct_return));
-
-extern value_ptr value_in PARAMS ((value_ptr element, value_ptr set));
-
-extern int value_bit_index PARAMS ((struct type *type, char *addr, int index));
-
-extern int using_struct_return PARAMS ((value_ptr function, CORE_ADDR funcaddr,
- struct type *value_type, int gcc_p));
-
-extern void set_return_value PARAMS ((value_ptr val));
-
-extern value_ptr evaluate_expression PARAMS ((struct expression *exp));
-
-extern value_ptr evaluate_type PARAMS ((struct expression *exp));
-
-extern value_ptr evaluate_subexp_with_coercion PARAMS ((struct expression *,
- int *, enum noside));
-
-extern value_ptr parse_and_eval PARAMS ((char *exp));
-
-extern value_ptr 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_ptr access_value_history PARAMS ((int num));
-
-extern value_ptr value_of_internalvar PARAMS ((struct internalvar *var));
-
-extern void set_internalvar PARAMS ((struct internalvar *var, value_ptr val));
-
-extern void set_internalvar_component PARAMS ((struct internalvar *var,
- int offset,
- int bitpos, int bitsize,
- value_ptr newvalue));
-
-extern struct internalvar *lookup_internalvar PARAMS ((char *name));
-
-extern int value_equal PARAMS ((value_ptr arg1, value_ptr arg2));
-
-extern int value_less PARAMS ((value_ptr arg1, value_ptr arg2));
-
-extern int value_logical_not PARAMS ((value_ptr arg1));
-
-/* C++ */
-
-extern value_ptr value_of_this PARAMS ((int complain));
-
-extern value_ptr value_x_binop PARAMS ((value_ptr arg1, value_ptr arg2,
- enum exp_opcode op,
- enum exp_opcode otherop,
- enum noside noside));
-
-extern value_ptr value_x_unop PARAMS ((value_ptr arg1, enum exp_opcode op,
- enum noside noside));
-
-extern value_ptr value_fn_field PARAMS ((value_ptr *arg1p, struct fn_field *f,
- int j,
- struct type* type, int offset));
-
-extern value_ptr value_virtual_fn_field PARAMS ((value_ptr *arg1p,
- struct fn_field *f, int j,
- struct type *type,
- int offset));
-
-extern int binop_user_defined_p PARAMS ((enum exp_opcode op,
- value_ptr arg1, value_ptr arg2));
-
-extern int unop_user_defined_p PARAMS ((enum exp_opcode op, value_ptr arg1));
-
-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_ptr val));
-
-extern int record_latest_value PARAMS ((value_ptr 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 CORE_ADDR
-read_register_pid PARAMS ((int regno, int pid));
-
-extern void
-write_register PARAMS ((int regno, LONGEST val));
-
-extern void
-write_register_pid PARAMS ((int regno, LONGEST val, int pid));
-
-extern void
-supply_register PARAMS ((int regno, char *val));
-
-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, LONGEST fieldval, int bitpos, int bitsize));
-
-extern void
-type_print PARAMS ((struct type *type, char *varstring, GDB_FILE *stream,
- int show));
-
-extern char *baseclass_addr PARAMS ((struct type *type, int index,
- char *valaddr,
- value_ptr *valuep, int *errp));
-
-extern void
-print_longest PARAMS ((GDB_FILE *stream, int format, int use_local,
- LONGEST val));
-
-extern void
-print_floating PARAMS ((char *valaddr, struct type *type, GDB_FILE *stream));
-
-extern int value_print PARAMS ((value_ptr val, GDB_FILE *stream, int format,
- enum val_prettyprint pretty));
-
-extern void
-value_print_array_elements PARAMS ((value_ptr val, GDB_FILE* stream,
- int format, enum val_prettyprint pretty));
-
-extern value_ptr
-value_release_to_mark PARAMS ((value_ptr mark));
-
-extern int
-val_print PARAMS ((struct type *type, char *valaddr, int embedded_offset, CORE_ADDR address,
- GDB_FILE *stream, int format, int deref_ref,
- int recurse, enum val_prettyprint pretty));
-
-extern int
-val_print_string PARAMS ((CORE_ADDR addr, int len, int width, GDB_FILE *stream));
-
-extern void
-print_variable_value PARAMS ((struct symbol *var, struct frame_info *frame,
- GDB_FILE *stream));
-
-extern int check_field PARAMS ((value_ptr, const char *));
-
-extern void
-c_typedef_print PARAMS ((struct type *type, struct symbol *news, GDB_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_ptr value_copy PARAMS ((value_ptr));
-
-extern int baseclass_offset PARAMS ((struct type *, int, char *, CORE_ADDR));
-
-/* From valops.c */
-
-extern value_ptr varying_to_slice PARAMS ((value_ptr));
-
-extern value_ptr value_slice PARAMS ((value_ptr, int, int));
-
-extern value_ptr call_function_by_hand PARAMS ((value_ptr, int, value_ptr *));
-
-extern value_ptr value_literal_complex PARAMS ((value_ptr, value_ptr, struct type*));
-
-extern void find_rt_vbase_offset PARAMS ((struct type *, struct type *, char *, int, int *, int *));
-
-extern value_ptr find_function_in_inferior PARAMS ((char *));
-
-extern value_ptr value_allocate_space_in_inferior PARAMS ((int));
-
-#endif /* !defined (VALUE_H) */