596 lines
22 KiB
C++
596 lines
22 KiB
C++
/* Definitions for values of C expressions, for GDB.
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Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
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1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
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2008, 2009 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 3 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, see <http://www.gnu.org/licenses/>. */
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#if !defined (VALUE_H)
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#define VALUE_H 1
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#include "doublest.h"
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#include "frame.h" /* For struct frame_id. */
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struct block;
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struct expression;
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struct regcache;
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struct symbol;
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struct type;
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struct ui_file;
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struct language_defn;
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struct value_print_options;
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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
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inferior (i.e. to be put into the history list or an internal
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variable). */
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struct value;
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/* Needed if another module needs to maintain its own list of values. */
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void value_prepend_to_list (struct value **head, struct value *val);
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void value_remove_from_list (struct value **head, struct value *val);
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/* Values are stored in a chain, so that they can be deleted easily
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over calls to the inferior. Values assigned to internal variables,
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put into the value history or exposed to Python are taken off this
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list. */
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struct value *value_next (struct value *);
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/* Type of the value. */
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extern struct type *value_type (struct value *);
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/* This is being used to change the type of an existing value, that
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code should instead be creating a new value with the changed type
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(but possibly shared content). */
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extern void deprecated_set_value_type (struct value *value,
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struct type *type);
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/* Only used for bitfields; number of bits contained in them. */
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extern int value_bitsize (struct value *);
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extern void set_value_bitsize (struct value *, int bit);
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/* Only used for bitfields; position of start of field. For
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gdbarch_bits_big_endian=0 targets, it is the position of the LSB. For
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gdbarch_bits_big_endian=1 targets, it is the position of the MSB. */
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extern int value_bitpos (struct value *);
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extern void set_value_bitpos (struct value *, int bit);
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/* Describes offset of a value within lval of a structure in bytes.
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If lval == lval_memory, this is an offset to the address. If lval
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== lval_register, this is a further offset from location.address
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within the registers structure. Note also the member
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embedded_offset below. */
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extern int value_offset (struct value *);
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extern void set_value_offset (struct value *, int offset);
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/* The comment from "struct value" reads: ``Is it modifiable? Only
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relevant if lval != not_lval.''. Shouldn't the value instead be
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not_lval and be done with it? */
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extern int deprecated_value_modifiable (struct value *value);
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extern void deprecated_set_value_modifiable (struct value *value,
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int modifiable);
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/* If a value represents a C++ object, then the `type' field gives the
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object's compile-time type. If the object actually belongs to some
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class derived from `type', perhaps with other base classes and
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additional members, then `type' is just a subobject of the real
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thing, and the full object is probably larger than `type' would
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suggest.
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If `type' is a dynamic class (i.e. one with a vtable), then GDB can
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actually determine the object's run-time type by looking at the
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run-time type information in the vtable. When this information is
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available, we may elect to read in the entire object, for several
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reasons:
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- When printing the value, the user would probably rather see the
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full object, not just the limited portion apparent from the
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compile-time type.
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- If `type' has virtual base classes, then even printing `type'
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alone may require reaching outside the `type' portion of the
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object to wherever the virtual base class has been stored.
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When we store the entire object, `enclosing_type' is the run-time
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type -- the complete object -- and `embedded_offset' is the offset
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of `type' within that larger type, in bytes. The value_contents()
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macro takes `embedded_offset' into account, so most GDB code
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continues to see the `type' portion of the value, just as the
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inferior would.
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If `type' is a pointer to an object, then `enclosing_type' is a
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pointer to the object's run-time type, and `pointed_to_offset' is
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the offset in bytes from the full object to the pointed-to object
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-- that is, the value `embedded_offset' would have if we followed
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the pointer and fetched the complete object. (I don't really see
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the point. Why not just determine the run-time type when you
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indirect, and avoid the special case? The contents don't matter
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until you indirect anyway.)
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If we're not doing anything fancy, `enclosing_type' is equal to
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`type', and `embedded_offset' is zero, so everything works
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normally. */
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extern struct type *value_enclosing_type (struct value *);
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extern struct value *value_change_enclosing_type (struct value *val,
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struct type *new_type);
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extern int value_pointed_to_offset (struct value *value);
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extern void set_value_pointed_to_offset (struct value *value, int val);
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extern int value_embedded_offset (struct value *value);
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extern void set_value_embedded_offset (struct value *value, int val);
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/* If zero, contents of this value are in the contents field. If
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nonzero, contents are in inferior. If the lval field is lval_memory,
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the contents are in inferior memory at location.address plus offset.
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The lval field may also be lval_register.
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WARNING: This field is used by the code which handles watchpoints
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(see breakpoint.c) to decide whether a particular value can be
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watched by hardware watchpoints. If the lazy flag is set for some
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member of a value chain, it is assumed that this member of the
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chain doesn't need to be watched as part of watching the value
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itself. This is how GDB avoids watching the entire struct or array
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when the user wants to watch a single struct member or array
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element. If you ever change the way lazy flag is set and reset, be
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sure to consider this use as well! */
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extern int value_lazy (struct value *);
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extern void set_value_lazy (struct value *value, int val);
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/* value_contents() and value_contents_raw() both return the address
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of 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
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being debugged if it hasn't already been loaded
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(value_contents_writeable() is used when a writeable but fetched
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buffer is required).. value_contents_raw() is used when data is
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being stored into the buffer, or when it is certain that the
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contents of the buffer are valid.
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Note: The contents pointer is adjusted by the offset required to
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get to the real subobject, if the value happens to represent
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something embedded in a larger run-time object. */
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extern gdb_byte *value_contents_raw (struct value *);
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/* Actual contents of the value. For use of this value; setting it
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uses the stuff above. Not valid if lazy is nonzero. Target
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byte-order. We force it to be aligned properly for any possible
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value. Note that a value therefore extends beyond what is
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declared here. */
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extern const gdb_byte *value_contents (struct value *);
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extern gdb_byte *value_contents_writeable (struct value *);
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/* The ALL variants of the above two macros do not adjust the returned
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pointer by the embedded_offset value. */
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extern gdb_byte *value_contents_all_raw (struct value *);
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extern const gdb_byte *value_contents_all (struct value *);
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extern int value_fetch_lazy (struct value *val);
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extern int value_contents_equal (struct value *val1, struct value *val2);
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/* If nonzero, this is the value of a variable which does not actually
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exist in the program. */
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extern int value_optimized_out (struct value *value);
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extern void set_value_optimized_out (struct value *value, int val);
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/* Set or return field indicating whether a variable is initialized or
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not, based on debugging information supplied by the compiler.
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1 = initialized; 0 = uninitialized. */
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extern int value_initialized (struct value *);
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extern void set_value_initialized (struct value *, int);
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/* While the following fields are per- VALUE .CONTENT .PIECE (i.e., a
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single value might have multiple LVALs), this hacked interface is
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limited to just the first PIECE. Expect further change. */
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/* Type of value; either not an lval, or one of the various different
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possible kinds of lval. */
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extern enum lval_type *deprecated_value_lval_hack (struct value *);
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#define VALUE_LVAL(val) (*deprecated_value_lval_hack (val))
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/* If lval == lval_memory, this is the address in the inferior. If
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lval == lval_register, this is the byte offset into the registers
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structure. */
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extern CORE_ADDR *deprecated_value_address_hack (struct value *);
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#define VALUE_ADDRESS(val) (*deprecated_value_address_hack (val))
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/* Pointer to internal variable. */
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extern struct internalvar **deprecated_value_internalvar_hack (struct value *);
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#define VALUE_INTERNALVAR(val) (*deprecated_value_internalvar_hack (val))
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/* Frame register value is relative to. This will be described in the
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lval enum above as "lval_register". */
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extern struct frame_id *deprecated_value_frame_id_hack (struct value *);
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#define VALUE_FRAME_ID(val) (*deprecated_value_frame_id_hack (val))
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/* Register number if the value is from a register. */
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extern short *deprecated_value_regnum_hack (struct value *);
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#define VALUE_REGNUM(val) (*deprecated_value_regnum_hack (val))
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/* Convert a REF to the object referenced. */
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extern struct value *coerce_ref (struct value *value);
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/* If ARG is an array, convert it to a pointer.
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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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extern struct value *coerce_array (struct value *value);
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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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struct value *value;
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int endian;
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};
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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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struct frame_info;
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struct fn_field;
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extern void print_address_demangle (CORE_ADDR, struct ui_file *, int);
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extern LONGEST value_as_long (struct value *val);
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extern DOUBLEST value_as_double (struct value *val);
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extern CORE_ADDR value_as_address (struct value *val);
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extern LONGEST unpack_long (struct type *type, const gdb_byte *valaddr);
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extern DOUBLEST unpack_double (struct type *type, const gdb_byte *valaddr,
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int *invp);
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extern CORE_ADDR unpack_pointer (struct type *type, const gdb_byte *valaddr);
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extern LONGEST unpack_field_as_long (struct type *type,
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const gdb_byte *valaddr,
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int fieldno);
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extern void pack_long (gdb_byte *buf, struct type *type, LONGEST num);
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extern struct value *value_from_longest (struct type *type, LONGEST num);
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extern struct value *value_from_pointer (struct type *type, CORE_ADDR addr);
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extern struct value *value_from_double (struct type *type, DOUBLEST num);
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extern struct value *value_from_decfloat (struct type *type,
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const gdb_byte *decbytes);
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extern struct value *value_from_string (char *string);
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extern struct value *value_at (struct type *type, CORE_ADDR addr);
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extern struct value *value_at_lazy (struct type *type, CORE_ADDR addr);
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extern struct value *value_from_contents_and_address (struct type *,
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const gdb_byte *,
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CORE_ADDR);
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extern struct value *default_value_from_register (struct type *type,
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int regnum,
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struct frame_info *frame);
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extern struct value *value_from_register (struct type *type, int regnum,
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struct frame_info *frame);
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extern CORE_ADDR address_from_register (struct type *type, int regnum,
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struct frame_info *frame);
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extern struct value *value_of_variable (struct symbol *var, struct block *b);
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extern struct value *value_of_register (int regnum, struct frame_info *frame);
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struct value *value_of_register_lazy (struct frame_info *frame, int regnum);
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extern int symbol_read_needs_frame (struct symbol *);
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extern struct value *read_var_value (struct symbol *var,
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struct frame_info *frame);
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extern struct value *locate_var_value (struct symbol *var,
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struct frame_info *frame);
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extern struct value *allocate_value (struct type *type);
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extern struct value *allocate_value_lazy (struct type *type);
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extern void allocate_value_contents (struct value *value);
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extern struct value *allocate_repeat_value (struct type *type, int count);
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extern struct value *value_mark (void);
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extern void value_free_to_mark (struct value *mark);
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extern struct value *value_string (char *ptr, int len);
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extern struct value *value_bitstring (char *ptr, int len);
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extern struct value *value_array (int lowbound, int highbound,
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struct value **elemvec);
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extern struct value *value_concat (struct value *arg1, struct value *arg2);
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extern struct value *value_binop (struct value *arg1, struct value *arg2,
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enum exp_opcode op);
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extern struct value *value_ptradd (struct value *arg1, struct value *arg2);
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extern struct value *value_ptrsub (struct value *arg1, struct value *arg2);
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extern LONGEST value_ptrdiff (struct value *arg1, struct value *arg2);
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extern int value_must_coerce_to_target (struct value *arg1);
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extern struct value *value_coerce_to_target (struct value *arg1);
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extern struct value *value_coerce_array (struct value *arg1);
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extern struct value *value_coerce_function (struct value *arg1);
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extern struct value *value_ind (struct value *arg1);
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extern struct value *value_addr (struct value *arg1);
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extern struct value *value_ref (struct value *arg1);
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extern struct value *value_assign (struct value *toval,
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struct value *fromval);
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extern struct value *value_pos (struct value *arg1);
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extern struct value *value_neg (struct value *arg1);
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extern struct value *value_complement (struct value *arg1);
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extern struct value *value_struct_elt (struct value **argp,
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struct value **args,
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char *name, int *static_memfuncp,
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char *err);
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extern struct value *value_aggregate_elt (struct type *curtype,
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char *name,
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int want_address,
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enum noside noside);
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extern struct value *value_static_field (struct type *type, int fieldno);
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extern struct fn_field *value_find_oload_method_list (struct value **, char *,
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int, int *,
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struct type **, int *);
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extern int find_overload_match (struct type **arg_types, int nargs,
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char *name, int method, int lax,
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struct value **objp, struct symbol *fsym,
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struct value **valp, struct symbol **symp,
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int *staticp);
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extern struct value *value_field (struct value *arg1, int fieldno);
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extern struct value *value_primitive_field (struct value *arg1, int offset,
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int fieldno,
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struct type *arg_type);
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extern struct type *value_rtti_target_type (struct value *, int *, int *,
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int *);
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extern struct value *value_full_object (struct value *, struct type *, int,
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int, int);
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extern struct value *value_cast_pointers (struct type *, struct value *);
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extern struct value *value_cast (struct type *type, struct value *arg2);
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extern struct value *value_zero (struct type *type, enum lval_type lv);
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extern struct value *value_one (struct type *type, enum lval_type lv);
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extern struct value *value_repeat (struct value *arg1, int count);
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extern struct value *value_subscript (struct value *array, struct value *idx);
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extern struct value *value_bitstring_subscript (struct type *type,
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struct value *bitstring,
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struct value *idx);
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extern struct value *register_value_being_returned (struct type *valtype,
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struct regcache *retbuf);
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extern int value_in (struct value *element, struct value *set);
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extern int value_bit_index (struct type *type, const gdb_byte *addr,
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int index);
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extern int using_struct_return (struct type *func_type,
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struct type *value_type);
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extern struct value *evaluate_expression (struct expression *exp);
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extern struct value *evaluate_type (struct expression *exp);
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extern struct value *evaluate_subexpression_type (struct expression *exp,
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int subexp);
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extern char *extract_field_op (struct expression *exp, int *subexp);
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extern struct value *evaluate_subexp_with_coercion (struct expression *,
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int *, enum noside);
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extern struct value *parse_and_eval (char *exp);
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extern struct value *parse_to_comma_and_eval (char **expp);
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extern struct type *parse_and_eval_type (char *p, int length);
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extern CORE_ADDR parse_and_eval_address (char *exp);
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extern CORE_ADDR parse_and_eval_address_1 (char **expptr);
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extern LONGEST parse_and_eval_long (char *exp);
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extern void unop_promote (const struct language_defn *language,
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struct gdbarch *gdbarch,
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struct value **arg1);
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extern void binop_promote (const struct language_defn *language,
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struct gdbarch *gdbarch,
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struct value **arg1, struct value **arg2);
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extern struct value *access_value_history (int num);
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extern struct value *value_of_internalvar (struct internalvar *var);
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extern void set_internalvar (struct internalvar *var, struct value *val);
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extern void set_internalvar_component (struct internalvar *var,
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int offset,
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int bitpos, int bitsize,
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struct value *newvalue);
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extern struct internalvar *lookup_only_internalvar (char *name);
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extern struct internalvar *create_internalvar (char *name);
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extern struct internalvar *lookup_internalvar (char *name);
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extern int value_equal (struct value *arg1, struct value *arg2);
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extern int value_less (struct value *arg1, struct value *arg2);
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extern int value_logical_not (struct value *arg1);
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/* C++ */
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extern struct value *value_of_this (int complain);
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extern struct value *value_x_binop (struct value *arg1, struct value *arg2,
|
||
enum exp_opcode op,
|
||
enum exp_opcode otherop,
|
||
enum noside noside);
|
||
|
||
extern struct value *value_x_unop (struct value *arg1, enum exp_opcode op,
|
||
enum noside noside);
|
||
|
||
extern struct value *value_fn_field (struct value **arg1p, struct fn_field *f,
|
||
int j, struct type *type, int offset);
|
||
|
||
extern int binop_user_defined_p (enum exp_opcode op, struct value *arg1,
|
||
struct value *arg2);
|
||
|
||
extern int unop_user_defined_p (enum exp_opcode op, struct value *arg1);
|
||
|
||
extern int destructor_name_p (const char *name, const struct type *type);
|
||
|
||
extern void value_free (struct value *val);
|
||
|
||
extern void free_all_values (void);
|
||
|
||
extern void release_value (struct value *val);
|
||
|
||
extern int record_latest_value (struct value *val);
|
||
|
||
extern void modify_field (gdb_byte *addr, LONGEST fieldval, int bitpos,
|
||
int bitsize);
|
||
|
||
extern void type_print (struct type *type, char *varstring,
|
||
struct ui_file *stream, int show);
|
||
|
||
extern gdb_byte *baseclass_addr (struct type *type, int index,
|
||
gdb_byte *valaddr,
|
||
struct value **valuep, int *errp);
|
||
|
||
extern void print_longest (struct ui_file *stream, int format,
|
||
int use_local, LONGEST val);
|
||
|
||
extern void print_floating (const gdb_byte *valaddr, struct type *type,
|
||
struct ui_file *stream);
|
||
|
||
extern void print_decimal_floating (const gdb_byte *valaddr, struct type *type,
|
||
struct ui_file *stream);
|
||
|
||
extern int value_print (struct value *val, struct ui_file *stream,
|
||
const struct value_print_options *options);
|
||
|
||
extern void value_print_array_elements (struct value *val,
|
||
struct ui_file *stream, int format,
|
||
enum val_prettyprint pretty);
|
||
|
||
extern struct value *value_release_to_mark (struct value *mark);
|
||
|
||
extern int val_print (struct type *type, const gdb_byte *valaddr,
|
||
int embedded_offset, CORE_ADDR address,
|
||
struct ui_file *stream, int recurse,
|
||
const struct value_print_options *options,
|
||
const struct language_defn *language);
|
||
|
||
extern int common_val_print (struct value *val,
|
||
struct ui_file *stream, int recurse,
|
||
const struct value_print_options *options,
|
||
const struct language_defn *language);
|
||
|
||
extern int val_print_string (CORE_ADDR addr, int len, int width,
|
||
struct ui_file *stream,
|
||
const struct value_print_options *options);
|
||
|
||
extern void print_variable_and_value (const char *name,
|
||
struct symbol *var,
|
||
struct frame_info *frame,
|
||
struct ui_file *stream,
|
||
int indent);
|
||
|
||
extern int check_field (struct type *, const char *);
|
||
|
||
extern void typedef_print (struct type *type, struct symbol *news,
|
||
struct ui_file *stream);
|
||
|
||
extern char *internalvar_name (struct internalvar *var);
|
||
|
||
extern void preserve_values (struct objfile *);
|
||
|
||
/* From values.c */
|
||
|
||
extern struct value *value_copy (struct value *);
|
||
|
||
/* From valops.c */
|
||
|
||
extern struct value *varying_to_slice (struct value *);
|
||
|
||
extern struct value *value_slice (struct value *, int, int);
|
||
|
||
extern struct value *value_literal_complex (struct value *, struct value *,
|
||
struct type *);
|
||
|
||
extern struct value *find_function_in_inferior (const char *,
|
||
struct objfile **);
|
||
|
||
extern struct value *value_allocate_space_in_inferior (int);
|
||
|
||
extern struct value *value_of_local (const char *name, int complain);
|
||
|
||
extern struct value * value_subscripted_rvalue (struct value *array, struct value *idx, int lowerbound);
|
||
#endif /* !defined (VALUE_H) */
|