571 lines
20 KiB
C
571 lines
20 KiB
C
/* Definitions for values of C expressions, for GDB.
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Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
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1996, 1997, 1998, 1999, 2000, 2001
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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,
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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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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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/* If lval == lval_memory, this is the address in the inferior.
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If lval == lval_register, this is the byte offset into the
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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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}
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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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If lval == lval_memory, this is an offset to the address.
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If lval == lval_register, this is a further offset from
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location.address within the registers structure.
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Note also 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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/* If a value represents a C++ object, then the `type' field gives
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the object's compile-time type. If the object actually belongs
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to some class derived from `type', perhaps with other base
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classes and additional members, then `type' is just a subobject
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of the real thing, and the full object is probably larger than
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`type' would suggest.
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If `type' is a dynamic class (i.e. one with a vtable), then GDB
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can actually determine the object's run-time type by looking at
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the run-time type information in the vtable. When this
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information is available, we may elect to read in the entire
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object, for several reasons:
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- When printing the value, the user would probably rather see
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the full object, not just the limited portion apparent from
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the compile-time type.
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- If `type' has virtual base classes, then even printing
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`type' alone may require reaching outside the `type'
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portion of the object to wherever the virtual base class
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has been stored.
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When we store the entire object, `enclosing_type' is the
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run-time type --- the complete object --- and `embedded_offset'
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is the offset of `type' within that larger type, in bytes. The
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VALUE_CONTENTS macro takes `embedded_offset' into account, so
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most GDB code continues to see the `type' portion of the value,
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just as the 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'
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is the offset in bytes from the full object to the pointed-to
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object --- that is, the value `embedded_offset' would have if
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we followed the pointer and fetched the complete object. (I
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don't really see the point. Why not just determine the
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run-time type when you indirect, and avoid the special case?
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The contents don't matter 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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struct type *enclosing_type;
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int embedded_offset;
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int pointed_to_offset;
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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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{
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CORE_ADDR memaddr;
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char *myaddr;
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}
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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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WARNING: This field is used by the code which handles
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watchpoints (see breakpoint.c) to decide whether a particular
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value can be watched by hardware watchpoints. If the lazy flag
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is set for some member of a value chain, it is assumed that
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this member of the chain doesn't need to be watched as part of
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watching the value itself. This is how GDB avoids watching the
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entire struct or array when the user wants to watch a single
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struct member or array element. If you ever change the way
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lazy flag is set and reset, be sure to consider this use as
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well! */
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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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/* 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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{
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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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}
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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 (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_pointer (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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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 (value_ptr val);
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extern DOUBLEST value_as_double (value_ptr val);
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extern CORE_ADDR value_as_pointer (value_ptr val);
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extern LONGEST unpack_long (struct type *type, char *valaddr);
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extern DOUBLEST unpack_double (struct type *type, char *valaddr, int *invp);
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extern CORE_ADDR unpack_pointer (struct type *type, char *valaddr);
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extern LONGEST unpack_field_as_long (struct type *type, char *valaddr,
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int fieldno);
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extern value_ptr value_from_longest (struct type *type, LONGEST num);
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extern value_ptr value_from_pointer (struct type *type, CORE_ADDR addr);
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extern value_ptr value_from_double (struct type *type, DOUBLEST num);
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extern value_ptr value_from_string (char *string);
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extern value_ptr value_at (struct type *type, CORE_ADDR addr,
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asection * sect);
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extern value_ptr value_at_lazy (struct type *type, CORE_ADDR addr,
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asection * sect);
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extern value_ptr value_from_register (struct type *type, int regnum,
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struct frame_info *frame);
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extern value_ptr value_of_variable (struct symbol *var, struct block *b);
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extern value_ptr value_of_register (int regnum);
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extern int symbol_read_needs_frame (struct symbol *);
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extern value_ptr read_var_value (struct symbol *var,
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struct frame_info *frame);
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extern value_ptr locate_var_value (struct symbol *var,
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struct frame_info *frame);
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extern value_ptr allocate_value (struct type *type);
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extern value_ptr allocate_repeat_value (struct type *type, int count);
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extern value_ptr value_change_enclosing_type (value_ptr val, struct type *new_type);
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extern value_ptr value_mark (void);
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extern void value_free_to_mark (value_ptr mark);
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extern value_ptr value_string (char *ptr, int len);
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extern value_ptr value_bitstring (char *ptr, int len);
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extern value_ptr value_array (int lowbound, int highbound,
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value_ptr * elemvec);
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extern value_ptr value_concat (value_ptr arg1, value_ptr arg2);
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extern value_ptr value_binop (value_ptr arg1, value_ptr arg2,
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enum exp_opcode op);
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extern value_ptr value_add (value_ptr arg1, value_ptr arg2);
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extern value_ptr value_sub (value_ptr arg1, value_ptr arg2);
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extern value_ptr value_coerce_array (value_ptr arg1);
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extern value_ptr value_coerce_function (value_ptr arg1);
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extern value_ptr value_ind (value_ptr arg1);
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extern value_ptr value_addr (value_ptr arg1);
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extern value_ptr value_assign (value_ptr toval, value_ptr fromval);
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extern value_ptr value_neg (value_ptr arg1);
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extern value_ptr value_complement (value_ptr arg1);
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extern value_ptr value_struct_elt (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 (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 (struct type *type, int fieldno);
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extern struct fn_field *value_find_oload_method_list (value_ptr *, char *,
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int, 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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value_ptr obj, struct symbol *fsym,
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value_ptr * valp, struct symbol **symp,
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int *staticp);
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extern value_ptr value_field (value_ptr arg1, int fieldno);
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extern value_ptr value_primitive_field (value_ptr arg1, int offset,
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int fieldno, struct type *arg_type);
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extern struct type *value_rtti_target_type (value_ptr, int *, int *, int *);
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extern value_ptr value_full_object (value_ptr, struct type *, int, int, int);
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extern value_ptr value_cast (struct type *type, value_ptr arg2);
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extern value_ptr value_zero (struct type *type, enum lval_type lv);
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extern value_ptr value_repeat (value_ptr arg1, int count);
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extern value_ptr value_subscript (value_ptr array, value_ptr idx);
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extern value_ptr value_from_vtable_info (value_ptr arg, struct type *type);
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extern value_ptr value_being_returned (struct type *valtype,
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char *retbuf, int struct_return);
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extern value_ptr value_in (value_ptr element, value_ptr set);
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extern int value_bit_index (struct type *type, char *addr, int index);
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extern int using_struct_return (value_ptr function, CORE_ADDR funcaddr,
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struct type *value_type, int gcc_p);
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extern void set_return_value (value_ptr val);
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extern value_ptr evaluate_expression (struct expression *exp);
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extern value_ptr evaluate_type (struct expression *exp);
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extern value_ptr evaluate_subexp_with_coercion (struct expression *,
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int *, enum noside);
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extern value_ptr parse_and_eval (char *exp);
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extern value_ptr 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 value_ptr access_value_history (int num);
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extern value_ptr value_of_internalvar (struct internalvar *var);
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extern void set_internalvar (struct internalvar *var, value_ptr 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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value_ptr newvalue);
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extern struct internalvar *lookup_internalvar (char *name);
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extern int value_equal (value_ptr arg1, value_ptr arg2);
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extern int value_less (value_ptr arg1, value_ptr arg2);
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extern int value_logical_not (value_ptr arg1);
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/* C++ */
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extern value_ptr value_of_this (int complain);
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extern value_ptr value_x_binop (value_ptr arg1, value_ptr arg2,
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enum exp_opcode op,
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enum exp_opcode otherop, enum noside noside);
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extern value_ptr value_x_unop (value_ptr arg1, enum exp_opcode op,
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enum noside noside);
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extern value_ptr value_fn_field (value_ptr * arg1p, struct fn_field *f,
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int j, struct type *type, int offset);
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extern int binop_user_defined_p (enum exp_opcode op,
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value_ptr arg1, value_ptr arg2);
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extern int unop_user_defined_p (enum exp_opcode op, value_ptr arg1);
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extern int destructor_name_p (const char *name, const struct type *type);
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#define value_free(val) xfree (val)
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extern void free_all_values (void);
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||
extern void release_value (value_ptr val);
|
||
|
||
extern int record_latest_value (value_ptr val);
|
||
|
||
extern void
|
||
modify_field (char *addr, LONGEST fieldval, int bitpos, int bitsize);
|
||
|
||
extern void type_print (struct type * type, char *varstring,
|
||
struct ui_file * stream, int show);
|
||
|
||
extern char *baseclass_addr (struct type *type, int index,
|
||
char *valaddr, value_ptr * valuep, int *errp);
|
||
|
||
extern void print_longest (struct ui_file * stream, int format,
|
||
int use_local, LONGEST val);
|
||
|
||
extern void print_floating (char *valaddr, struct type * type,
|
||
struct ui_file * stream);
|
||
|
||
extern int value_print (value_ptr val, struct ui_file *stream, int format,
|
||
enum val_prettyprint pretty);
|
||
|
||
extern void value_print_array_elements (value_ptr val,
|
||
struct ui_file *stream,
|
||
int format,
|
||
enum val_prettyprint pretty);
|
||
|
||
extern value_ptr value_release_to_mark (value_ptr mark);
|
||
|
||
extern int val_print (struct type * type, char *valaddr,
|
||
int embedded_offset, CORE_ADDR address,
|
||
struct ui_file * stream, int format,
|
||
int deref_ref, int recurse,
|
||
enum val_prettyprint pretty);
|
||
|
||
extern int val_print_string (CORE_ADDR addr, int len, int width, struct ui_file *stream);
|
||
|
||
extern void print_variable_value (struct symbol * var,
|
||
struct frame_info * frame,
|
||
struct ui_file *stream);
|
||
|
||
extern int check_field (value_ptr, 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 clear_value_history (void);
|
||
|
||
extern void clear_internalvars (void);
|
||
|
||
/* From values.c */
|
||
|
||
extern value_ptr value_copy (value_ptr);
|
||
|
||
extern int baseclass_offset (struct type *, int, char *, CORE_ADDR);
|
||
|
||
/* From valops.c */
|
||
|
||
extern value_ptr varying_to_slice (value_ptr);
|
||
|
||
extern value_ptr value_slice (value_ptr, int, int);
|
||
|
||
extern value_ptr call_function_by_hand (value_ptr, int, value_ptr *);
|
||
|
||
extern int default_coerce_float_to_double (struct type *, struct type *);
|
||
|
||
extern int standard_coerce_float_to_double (struct type *, struct type *);
|
||
|
||
extern value_ptr value_literal_complex (value_ptr, value_ptr, struct type *);
|
||
|
||
extern void find_rt_vbase_offset (struct type *, struct type *, char *, int,
|
||
int *, int *);
|
||
|
||
extern value_ptr find_function_in_inferior (char *);
|
||
|
||
extern value_ptr value_allocate_space_in_inferior (int);
|
||
|
||
extern CORE_ADDR default_push_arguments (int nargs, value_ptr * args,
|
||
CORE_ADDR sp,
|
||
int struct_return,
|
||
CORE_ADDR struct_addr);
|
||
|
||
#endif /* !defined (VALUE_H) */
|