569 lines
20 KiB
C
569 lines
20 KiB
C
/* Definitions for values of C expressions, for GDB.
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Copyright 1986, 1987, 1989, 1992, 1993, 1994, 1995, 1996
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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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/* Is it modifiable? Only relevant if lval != not_lval. */
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int modifiable;
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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 of a structure in bytes.
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This is used in retrieving contents from target memory. [Note also
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the member embedded_offset below.] */
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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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/* Type of the enclosing object if this is an embedded subobject.
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The member embedded_offset gives the real position of the subobject
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if type is not the same as enclosing_type.
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If the type field is a pointer type, then enclosing_type is
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a pointer type pointing to the real (enclosing) type of the target
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object. */
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struct type *enclosing_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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/* ??? When is this used? */
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union {
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CORE_ADDR memaddr;
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char *myaddr;
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} substring_addr;
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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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/* If this value represents an object that is embedded inside a
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larger object (e.g., a base subobject in C++), this gives the
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offset (in bytes) from the start of the contents buffer where
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the embedded object begins. This is required because some C++
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runtime implementations lay out objects (especially virtual bases
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with possibly negative offsets to ancestors).
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Note: This may be positive or negative! Also note that this offset
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is not used when retrieving contents from target memory; the entire
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enclosing object has to be retrieved always, and the offset for
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that is given by the member offset above. */
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int embedded_offset;
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/* If this value represents a pointer to an object that is embedded
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in another object, this gives the embedded_offset of the object
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that is pointed to. */
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int pointed_to_offset;
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/* The BFD section associated with this value. */
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asection *bfd_section;
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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. Note that a value therefore extends beyond
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what is declared here. */
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union {
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long contents[1];
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double force_double_align;
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LONGEST force_longlong_align;
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char *literal_data;
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} aligner;
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/* Do not add any new members here -- contents above will trash them */
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};
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typedef struct value *value_ptr;
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#define VALUE_TYPE(val) (val)->type
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#define VALUE_ENCLOSING_TYPE(val) (val)->enclosing_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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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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#define VALUE_CONTENTS_RAW(val) ((char *) (val)->aligner.contents + (val)->embedded_offset)
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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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/* 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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#define VALUE_CONTENTS_ALL_RAW(val) ((char *) (val)->aligner.contents)
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#define VALUE_CONTENTS_ALL(val) ((void) (VALUE_LAZY(val) && value_fetch_lazy(val)),\
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VALUE_CONTENTS_ALL_RAW(val))
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extern int value_fetch_lazy PARAMS ((value_ptr 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_REGNO(val) (val)->regno
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#define VALUE_OPTIMIZED_OUT(val) ((val)->optimized_out)
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#define VALUE_EMBEDDED_OFFSET(val) ((val)->embedded_offset)
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#define VALUE_POINTED_TO_OFFSET(val) ((val)->pointed_to_offset)
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#define VALUE_BFD_SECTION(val) ((val)->bfd_section)
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/* Convert a REF to the object referenced. */
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#define COERCE_REF(arg) \
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do { struct type *value_type_arg_tmp = check_typedef (VALUE_TYPE (arg));\
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if (TYPE_CODE (value_type_arg_tmp) == TYPE_CODE_REF) \
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arg = value_at_lazy (TYPE_TARGET_TYPE (value_type_arg_tmp), \
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unpack_long (VALUE_TYPE (arg), \
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VALUE_CONTENTS (arg)), \
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VALUE_BFD_SECTION (arg)); \
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} while (0)
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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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do { COERCE_REF(arg); \
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if (current_language->c_style_arrays \
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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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} while (0)
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#define COERCE_NUMBER(arg) \
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do { COERCE_ARRAY(arg); COERCE_ENUM(arg); } while (0)
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#define COERCE_VARYING_ARRAY(arg, real_arg_type) \
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{ if (chill_varying_type (real_arg_type)) \
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arg = varying_to_slice (arg), real_arg_type = VALUE_TYPE (arg); }
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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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if (TYPE_CODE (check_typedef (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_ptr 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, GDB_FILE *, int));
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extern LONGEST value_as_long PARAMS ((value_ptr val));
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extern DOUBLEST value_as_double PARAMS ((value_ptr val));
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extern CORE_ADDR value_as_pointer PARAMS ((value_ptr val));
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extern LONGEST unpack_long PARAMS ((struct type *type, char *valaddr));
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extern DOUBLEST unpack_double PARAMS ((struct type *type, char *valaddr,
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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_ptr value_from_longest PARAMS ((struct type *type, LONGEST num));
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extern value_ptr value_from_double PARAMS ((struct type *type, DOUBLEST num));
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extern value_ptr value_at PARAMS ((struct type *type, CORE_ADDR addr, asection *sect));
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extern value_ptr value_at_lazy PARAMS ((struct type *type, CORE_ADDR addr, asection *sect));
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extern value_ptr value_from_register PARAMS ((struct type *type, int regnum,
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struct frame_info * frame));
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extern value_ptr value_of_variable PARAMS ((struct symbol *var,
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struct block *b));
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extern value_ptr value_of_register PARAMS ((int regnum));
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extern int symbol_read_needs_frame PARAMS ((struct symbol *));
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extern value_ptr read_var_value PARAMS ((struct symbol *var,
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struct frame_info *frame));
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extern value_ptr locate_var_value PARAMS ((struct symbol *var,
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struct frame_info *frame));
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extern value_ptr allocate_value PARAMS ((struct type *type));
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extern value_ptr allocate_repeat_value PARAMS ((struct type *type, int count));
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extern value_ptr value_mark PARAMS ((void));
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extern void value_free_to_mark PARAMS ((value_ptr mark));
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extern value_ptr value_string PARAMS ((char *ptr, int len));
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extern value_ptr value_bitstring PARAMS ((char *ptr, int len));
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extern value_ptr value_array PARAMS ((int lowbound, int highbound,
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value_ptr *elemvec));
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extern value_ptr value_concat PARAMS ((value_ptr arg1, value_ptr arg2));
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extern value_ptr value_binop PARAMS ((value_ptr arg1, value_ptr arg2,
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enum exp_opcode op));
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extern value_ptr value_add PARAMS ((value_ptr arg1, value_ptr arg2));
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extern value_ptr value_sub PARAMS ((value_ptr arg1, value_ptr arg2));
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extern value_ptr value_coerce_array PARAMS ((value_ptr arg1));
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extern value_ptr value_coerce_function PARAMS ((value_ptr arg1));
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extern value_ptr value_ind PARAMS ((value_ptr arg1));
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extern value_ptr value_addr PARAMS ((value_ptr arg1));
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extern value_ptr value_assign PARAMS ((value_ptr toval, value_ptr fromval));
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extern value_ptr value_neg PARAMS ((value_ptr arg1));
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extern value_ptr value_complement PARAMS ((value_ptr arg1));
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extern value_ptr value_struct_elt PARAMS ((value_ptr *argp, value_ptr *args,
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char *name,
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int *static_memfuncp, char *err));
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extern value_ptr 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_ptr value_static_field PARAMS ((struct type *type, int fieldno));
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||
extern struct fn_field *
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value_find_oload_method_list PARAMS ((value_ptr *, char *, int, int *, int *, struct type **, int *));
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extern value_ptr value_field PARAMS ((value_ptr arg1, int fieldno));
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extern value_ptr value_primitive_field PARAMS ((value_ptr arg1, int offset,
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int fieldno,
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struct type *arg_type));
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extern struct type *
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value_rtti_type PARAMS ((value_ptr, int *, int *, int *));
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||
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||
extern struct type *
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value_rtti_target_type PARAMS ((value_ptr, int *, int *, int *));
|
||
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||
extern value_ptr
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value_full_object PARAMS ((value_ptr, struct type *, int, int, int));
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||
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extern value_ptr value_cast PARAMS ((struct type *type, value_ptr arg2));
|
||
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||
extern value_ptr value_zero PARAMS ((struct type *type, enum lval_type lv));
|
||
|
||
extern value_ptr value_repeat PARAMS ((value_ptr arg1, int count));
|
||
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||
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,
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char retbuf[REGISTER_BYTES],
|
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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) */
|