501 lines
15 KiB
C
501 lines
15 KiB
C
/* Definitions for values of C expressions, for GDB.
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Copyright 1986, 1987, 1989, 1992 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 2 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, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#if !defined (VALUE_H)
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#define VALUE_H 1
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/*
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* The structure which defines the type of a value. It should never
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* be possible for a program lval value to survive over a call to the inferior
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* (ie to be put into the history list or an internal variable).
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*/
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enum lval_type {
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/* Not an lval. */
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not_lval,
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/* In memory. Could be a saved register. */
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lval_memory,
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/* In a register. */
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lval_register,
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/* In a gdb internal variable. */
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lval_internalvar,
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/* Part of a gdb internal variable (structure field). */
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lval_internalvar_component,
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/* In a register series in a frame not the current one, which may have been
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partially saved or saved in different places (otherwise would be
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lval_register or lval_memory). */
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lval_reg_frame_relative
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};
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struct value
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{
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/* Type of value; either not an lval, or one of the various
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different possible kinds of lval. */
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enum lval_type lval;
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/* Location of value (if lval). */
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union
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{
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/* Address in inferior or byte of registers structure. */
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CORE_ADDR address;
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/* Pointer to internal variable. */
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struct internalvar *internalvar;
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/* Number of register. Only used with
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lval_reg_frame_relative. */
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int regnum;
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} location;
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/* Describes offset of a value within lval a structure in bytes. */
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int offset;
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/* Only used for bitfields; number of bits contained in them. */
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int bitsize;
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/* Only used for bitfields; position of start of field.
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For BITS_BIG_ENDIAN=0 targets, it is the position of the LSB.
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For BITS_BIG_ENDIAN=1 targets, it is the position of the MSB. */
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int bitpos;
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/* Frame value is relative to. In practice, this address is only
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used if the value is stored in several registers in other than
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the current frame, and these registers have not all been saved
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at the same place in memory. This will be described in the
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lval enum above as "lval_reg_frame_relative". */
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CORE_ADDR frame_addr;
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/* Type of the value. */
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struct type *type;
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/* Values are stored in a chain, so that they can be deleted
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easily over calls to the inferior. Values assigned to internal
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variables or put into the value history are taken off this
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list. */
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struct value *next;
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/* If an lval is forced to repeat, a new value is created with
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these fields set. The new value is not an lval. */
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short repeated;
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short repetitions;
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/* Register number if the value is from a register. Is not kept
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if you take a field of a structure that is stored in a
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register. Shouldn't it be? */
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short regno;
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/* If zero, contents of this value are in the contents field.
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If nonzero, contents are in inferior memory at address
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in the location.address field plus the offset field
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(and the lval field should be lval_memory). */
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char lazy;
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/* If nonzero, this is the value of a variable which does not
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actually exist in the program. */
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char optimized_out;
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/* Actual contents of the value. For use of this value; setting
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it uses the stuff above. Not valid if lazy is nonzero.
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Target byte-order. We force it to be aligned properly for any
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possible value. */
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union {
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long contents[1];
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double force_double_align;
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#ifdef CC_HAS_LONG_LONG
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long long force_longlong_align;
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#endif
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} aligner;
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};
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typedef struct value *value;
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#define VALUE_TYPE(val) (val)->type
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#define VALUE_LAZY(val) (val)->lazy
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/* VALUE_CONTENTS and VALUE_CONTENTS_RAW both return the address of
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the gdb buffer used to hold a copy of the contents of the lval.
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VALUE_CONTENTS is used when the contents of the buffer are needed --
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it uses value_fetch_lazy() to load the buffer from the process being
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debugged if it hasn't already been loaded. VALUE_CONTENTS_RAW is
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used when data is being stored into the buffer, or when it is
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certain that the contents of the buffer are valid. */
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#define VALUE_CONTENTS_RAW(val) ((char *) (val)->aligner.contents)
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#define VALUE_CONTENTS(val) ((void)(VALUE_LAZY(val) && value_fetch_lazy(val)),\
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VALUE_CONTENTS_RAW(val))
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extern int
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value_fetch_lazy PARAMS ((value val));
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#define VALUE_LVAL(val) (val)->lval
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#define VALUE_ADDRESS(val) (val)->location.address
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#define VALUE_INTERNALVAR(val) (val)->location.internalvar
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#define VALUE_FRAME_REGNUM(val) ((val)->location.regnum)
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#define VALUE_FRAME(val) ((val)->frame_addr)
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#define VALUE_OFFSET(val) (val)->offset
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#define VALUE_BITSIZE(val) (val)->bitsize
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#define VALUE_BITPOS(val) (val)->bitpos
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#define VALUE_NEXT(val) (val)->next
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#define VALUE_REPEATED(val) (val)->repeated
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#define VALUE_REPETITIONS(val) (val)->repetitions
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#define VALUE_REGNO(val) (val)->regno
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#define VALUE_OPTIMIZED_OUT(val) ((val)->optimized_out)
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/* Convert a REF to the object referenced. */
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#define COERCE_REF(arg) \
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{ if (TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_REF) \
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arg = value_at_lazy (TYPE_TARGET_TYPE (VALUE_TYPE (arg)), \
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unpack_long (VALUE_TYPE (arg), \
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VALUE_CONTENTS (arg)));}
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/* If ARG is an array, convert it to a pointer.
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If ARG is an enum, convert it to an integer.
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If ARG is a function, convert it to a function pointer.
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References are dereferenced. */
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#define COERCE_ARRAY(arg) \
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{ COERCE_REF(arg); \
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if (VALUE_REPEATED (arg) \
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|| TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_ARRAY) \
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arg = value_coerce_array (arg); \
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if (TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_FUNC) \
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arg = value_coerce_function (arg); \
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if (TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_ENUM) \
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arg = value_cast (builtin_type_unsigned_int, arg); \
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}
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/* If ARG is an enum, convert it to an integer. */
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#define COERCE_ENUM(arg) \
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{ COERCE_REF (arg); \
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if (TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_ENUM) \
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arg = value_cast (builtin_type_unsigned_int, arg); \
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}
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/* Internal variables (variables for convenience of use of debugger)
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are recorded as a chain of these structures. */
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struct internalvar
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{
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struct internalvar *next;
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char *name;
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value value;
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};
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/* Pointer to member function. Depends on compiler implementation. */
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#define METHOD_PTR_IS_VIRTUAL(ADDR) ((ADDR) & 0x80000000)
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#define METHOD_PTR_FROM_VOFFSET(OFFSET) (0x80000000 + (OFFSET))
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#define METHOD_PTR_TO_VOFFSET(ADDR) (~0x80000000 & (ADDR))
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#include "symtab.h"
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#include "gdbtypes.h"
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#include "expression.h"
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#ifdef __STDC__
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struct frame_info;
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struct fn_field;
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#endif
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extern void
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print_address_demangle PARAMS ((CORE_ADDR, FILE *, int));
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extern LONGEST
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value_as_long PARAMS ((value val));
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extern double
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value_as_double PARAMS ((value val));
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extern CORE_ADDR
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value_as_pointer PARAMS ((value val));
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extern LONGEST
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unpack_long PARAMS ((struct type *type, char *valaddr));
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extern double
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unpack_double PARAMS ((struct type *type, char *valaddr, int *invp));
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extern CORE_ADDR unpack_pointer PARAMS ((struct type *type, char *valaddr));
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extern LONGEST unpack_field_as_long PARAMS ((struct type *type, char *valaddr,
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int fieldno));
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extern value value_from_longest PARAMS ((struct type *type, LONGEST num));
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extern value value_from_double PARAMS ((struct type *type, double num));
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extern value value_at PARAMS ((struct type *type, CORE_ADDR addr));
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extern value value_at_lazy PARAMS ((struct type *type, CORE_ADDR addr));
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/* FIXME: Assumes equivalence of "struct frame_info *" and "FRAME" */
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extern value value_from_register PARAMS ((struct type *type, int regnum,
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struct frame_info * frame));
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extern value value_of_variable PARAMS ((struct symbol *var, struct block *b));
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extern value value_of_register PARAMS ((int regnum));
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/* FIXME: Assumes equivalence of "struct frame_info *" and "FRAME" */
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extern value read_var_value PARAMS ((struct symbol *var,
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struct frame_info *frame));
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/* FIXME: Assumes equivalence of "struct frame_info *" and "FRAME" */
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extern value locate_var_value PARAMS ((struct symbol *var,
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struct frame_info *frame));
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extern value allocate_value PARAMS ((struct type *type));
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extern value allocate_repeat_value PARAMS ((struct type *type, int count));
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extern value value_mark PARAMS ((void));
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extern void value_free_to_mark PARAMS ((value mark));
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extern value value_string PARAMS ((char *ptr, int len));
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extern value value_array PARAMS ((int lowbound, int highbound,
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value *elemvec));
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extern value value_concat PARAMS ((value arg1, value arg2));
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extern value value_binop PARAMS ((value arg1, value arg2, enum exp_opcode op));
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extern value value_add PARAMS ((value arg1, value arg2));
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extern value value_sub PARAMS ((value arg1, value arg2));
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extern value value_coerce_array PARAMS ((value arg1));
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extern value value_coerce_function PARAMS ((value arg1));
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extern value value_ind PARAMS ((value arg1));
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extern value value_addr PARAMS ((value arg1));
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extern value value_assign PARAMS ((value toval, value fromval));
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extern value value_neg PARAMS ((value arg1));
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extern value value_complement PARAMS ((value arg1));
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extern value value_struct_elt PARAMS ((value *argp, value *args, char *name,
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int *static_memfuncp, char *err));
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extern value value_struct_elt_for_reference PARAMS ((struct type *domain,
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int offset,
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struct type *curtype,
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char *name,
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struct type *intype));
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extern value value_field PARAMS ((value arg1, int fieldno));
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extern value value_primitive_field PARAMS ((value arg1, int offset,
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int fieldno,
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struct type *arg_type));
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extern value value_cast PARAMS ((struct type *type, value arg2));
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extern value value_zero PARAMS ((struct type *type, enum lval_type lv));
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extern value value_repeat PARAMS ((value arg1, int count));
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extern value value_subscript PARAMS ((value array, value idx));
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extern value value_from_vtable_info PARAMS ((value arg, struct type *type));
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extern value value_being_returned PARAMS ((struct type *valtype,
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char retbuf[REGISTER_BYTES],
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int struct_return));
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extern int
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using_struct_return PARAMS ((value function, CORE_ADDR funcaddr,
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struct type *value_type, int gcc_p));
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extern void
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set_return_value PARAMS ((value val));
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extern value
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evaluate_expression PARAMS ((struct expression *exp));
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extern value
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evaluate_type PARAMS ((struct expression *exp));
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extern value
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parse_and_eval PARAMS ((char *exp));
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extern value
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parse_to_comma_and_eval PARAMS ((char **expp));
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extern struct type *
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parse_and_eval_type PARAMS ((char *p, int length));
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extern CORE_ADDR
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parse_and_eval_address PARAMS ((char *exp));
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extern CORE_ADDR
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parse_and_eval_address_1 PARAMS ((char **expptr));
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extern value
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access_value_history PARAMS ((int num));
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extern value
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value_of_internalvar PARAMS ((struct internalvar *var));
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extern void
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set_internalvar PARAMS ((struct internalvar *var, value val));
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extern void
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set_internalvar_component PARAMS ((struct internalvar *var, int offset,
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int bitpos, int bitsize,
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value newvalue));
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extern struct internalvar *
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lookup_internalvar PARAMS ((char *name));
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extern int
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value_equal PARAMS ((value arg1, value arg2));
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extern int
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value_less PARAMS ((value arg1, value arg2));
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extern int
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value_logical_not PARAMS ((value arg1));
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/* C++ */
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extern value
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value_of_this PARAMS ((int complain));
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extern value
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value_x_binop PARAMS ((value arg1, value arg2, enum exp_opcode op,
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enum exp_opcode otherop));
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extern value
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value_x_unop PARAMS ((value arg1, enum exp_opcode op));
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extern value
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value_fn_field PARAMS ((value *arg1p, struct fn_field *f, int j,
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struct type* type, int offset));
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extern value
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value_virtual_fn_field PARAMS ((value *arg1p, struct fn_field *f, int j,
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struct type *type, int offset));
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extern int
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binop_user_defined_p PARAMS ((enum exp_opcode op, value arg1, value arg2));
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extern int
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unop_user_defined_p PARAMS ((enum exp_opcode op, value arg1));
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extern int
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destructor_name_p PARAMS ((const char *name, const struct type *type));
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#define value_free(val) free ((PTR)val)
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extern void
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free_all_values PARAMS ((void));
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extern void
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release_value PARAMS ((value val));
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extern int
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record_latest_value PARAMS ((value val));
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extern void
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registers_changed PARAMS ((void));
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extern void
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read_register_bytes PARAMS ((int regbyte, char *myaddr, int len));
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extern void
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write_register_bytes PARAMS ((int regbyte, char *myaddr, int len));
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extern void
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read_register_gen PARAMS ((int regno, char *myaddr));
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extern CORE_ADDR
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read_register PARAMS ((int regno));
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extern void
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write_register PARAMS ((int regno, long val));
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extern void
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supply_register PARAMS ((int regno, char *val));
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/* FIXME: Assumes equivalence of "struct frame_info *" and "FRAME" */
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extern void
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get_saved_register PARAMS ((char *raw_buffer, int *optimized,
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CORE_ADDR *addrp, struct frame_info *frame,
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int regnum, enum lval_type *lval));
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extern void
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modify_field PARAMS ((char *addr, LONGEST fieldval, int bitpos, int bitsize));
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extern void
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type_print PARAMS ((struct type *type, char *varstring, FILE *stream,
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int show));
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extern char *
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baseclass_addr PARAMS ((struct type *type, int index, char *valaddr,
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value *valuep, int *errp));
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extern void
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print_longest PARAMS ((FILE *stream, int format, int use_local,
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LONGEST value));
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extern void
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print_floating PARAMS ((char *valaddr, struct type *type, FILE *stream));
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extern int
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value_print PARAMS ((value val, FILE *stream, int format,
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enum val_prettyprint pretty));
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extern int
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val_print PARAMS ((struct type *type, char *valaddr, CORE_ADDR address,
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FILE *stream, int format, int deref_ref,
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int recurse, enum val_prettyprint pretty));
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extern int
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val_print_string PARAMS ((CORE_ADDR addr, unsigned int len, FILE *stream));
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/* FIXME: Assumes equivalence of "struct frame_info *" and "FRAME" */
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extern void
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print_variable_value PARAMS ((struct symbol *var, struct frame_info *frame,
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FILE *stream));
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extern value
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value_arg_coerce PARAMS ((value));
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extern int
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check_field PARAMS ((value, const char *));
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extern void
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c_typedef_print PARAMS ((struct type *type, struct symbol *new, FILE *stream));
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extern char *
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internalvar_name PARAMS ((struct internalvar *var));
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extern void
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clear_value_history PARAMS ((void));
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extern void
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clear_internalvars PARAMS ((void));
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/* From values.c */
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extern value
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value_copy PARAMS ((value));
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extern int
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baseclass_offset PARAMS ((struct type *, int, value, int));
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/* From valops.c */
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extern value
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call_function_by_hand PARAMS ((value, int, value *));
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#endif /* !defined (VALUE_H) */
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