/* Find a variable's value in memory, for GDB, the GNU debugger.
|
/* Find a variable's value in memory, for GDB, the GNU debugger.
|
|
|
Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
|
Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
|
1996, 1997, 1998, 1999, 2000, 2001, 2003, 2004, 2005, 2007, 2008, 2009,
|
1996, 1997, 1998, 1999, 2000, 2001, 2003, 2004, 2005, 2007, 2008, 2009,
|
2010 Free Software Foundation, Inc.
|
2010 Free Software Foundation, Inc.
|
|
|
This file is part of GDB.
|
This file is part of GDB.
|
|
|
This program is free software; you can redistribute it and/or modify
|
This program is free software; you can redistribute it and/or modify
|
it under the terms of the GNU General Public License as published by
|
it under the terms of the GNU General Public License as published by
|
the Free Software Foundation; either version 3 of the License, or
|
the Free Software Foundation; either version 3 of the License, or
|
(at your option) any later version.
|
(at your option) any later version.
|
|
|
This program is distributed in the hope that it will be useful,
|
This program is distributed in the hope that it will be useful,
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
GNU General Public License for more details.
|
GNU General Public License for more details.
|
|
|
You should have received a copy of the GNU General Public License
|
You should have received a copy of the GNU General Public License
|
along with this program. If not, see <http://www.gnu.org/licenses/>. */
|
along with this program. If not, see <http://www.gnu.org/licenses/>. */
|
|
|
#include "defs.h"
|
#include "defs.h"
|
#include "symtab.h"
|
#include "symtab.h"
|
#include "gdbtypes.h"
|
#include "gdbtypes.h"
|
#include "frame.h"
|
#include "frame.h"
|
#include "value.h"
|
#include "value.h"
|
#include "gdbcore.h"
|
#include "gdbcore.h"
|
#include "inferior.h"
|
#include "inferior.h"
|
#include "target.h"
|
#include "target.h"
|
#include "gdb_string.h"
|
#include "gdb_string.h"
|
#include "gdb_assert.h"
|
#include "gdb_assert.h"
|
#include "floatformat.h"
|
#include "floatformat.h"
|
#include "symfile.h" /* for overlay functions */
|
#include "symfile.h" /* for overlay functions */
|
#include "regcache.h"
|
#include "regcache.h"
|
#include "user-regs.h"
|
#include "user-regs.h"
|
#include "block.h"
|
#include "block.h"
|
#include "objfiles.h"
|
#include "objfiles.h"
|
|
|
/* Basic byte-swapping routines. All 'extract' functions return a
|
/* Basic byte-swapping routines. All 'extract' functions return a
|
host-format integer from a target-format integer at ADDR which is
|
host-format integer from a target-format integer at ADDR which is
|
LEN bytes long. */
|
LEN bytes long. */
|
|
|
#if TARGET_CHAR_BIT != 8 || HOST_CHAR_BIT != 8
|
#if TARGET_CHAR_BIT != 8 || HOST_CHAR_BIT != 8
|
/* 8 bit characters are a pretty safe assumption these days, so we
|
/* 8 bit characters are a pretty safe assumption these days, so we
|
assume it throughout all these swapping routines. If we had to deal with
|
assume it throughout all these swapping routines. If we had to deal with
|
9 bit characters, we would need to make len be in bits and would have
|
9 bit characters, we would need to make len be in bits and would have
|
to re-write these routines... */
|
to re-write these routines... */
|
you lose
|
you lose
|
#endif
|
#endif
|
|
|
LONGEST
|
LONGEST
|
extract_signed_integer (const gdb_byte *addr, int len,
|
extract_signed_integer (const gdb_byte *addr, int len,
|
enum bfd_endian byte_order)
|
enum bfd_endian byte_order)
|
{
|
{
|
LONGEST retval;
|
LONGEST retval;
|
const unsigned char *p;
|
const unsigned char *p;
|
const unsigned char *startaddr = addr;
|
const unsigned char *startaddr = addr;
|
const unsigned char *endaddr = startaddr + len;
|
const unsigned char *endaddr = startaddr + len;
|
|
|
if (len > (int) sizeof (LONGEST))
|
if (len > (int) sizeof (LONGEST))
|
error (_("\
|
error (_("\
|
That operation is not available on integers of more than %d bytes."),
|
That operation is not available on integers of more than %d bytes."),
|
(int) sizeof (LONGEST));
|
(int) sizeof (LONGEST));
|
|
|
/* Start at the most significant end of the integer, and work towards
|
/* Start at the most significant end of the integer, and work towards
|
the least significant. */
|
the least significant. */
|
if (byte_order == BFD_ENDIAN_BIG)
|
if (byte_order == BFD_ENDIAN_BIG)
|
{
|
{
|
p = startaddr;
|
p = startaddr;
|
/* Do the sign extension once at the start. */
|
/* Do the sign extension once at the start. */
|
retval = ((LONGEST) * p ^ 0x80) - 0x80;
|
retval = ((LONGEST) * p ^ 0x80) - 0x80;
|
for (++p; p < endaddr; ++p)
|
for (++p; p < endaddr; ++p)
|
retval = (retval << 8) | *p;
|
retval = (retval << 8) | *p;
|
}
|
}
|
else
|
else
|
{
|
{
|
p = endaddr - 1;
|
p = endaddr - 1;
|
/* Do the sign extension once at the start. */
|
/* Do the sign extension once at the start. */
|
retval = ((LONGEST) * p ^ 0x80) - 0x80;
|
retval = ((LONGEST) * p ^ 0x80) - 0x80;
|
for (--p; p >= startaddr; --p)
|
for (--p; p >= startaddr; --p)
|
retval = (retval << 8) | *p;
|
retval = (retval << 8) | *p;
|
}
|
}
|
return retval;
|
return retval;
|
}
|
}
|
|
|
ULONGEST
|
ULONGEST
|
extract_unsigned_integer (const gdb_byte *addr, int len,
|
extract_unsigned_integer (const gdb_byte *addr, int len,
|
enum bfd_endian byte_order)
|
enum bfd_endian byte_order)
|
{
|
{
|
ULONGEST retval;
|
ULONGEST retval;
|
const unsigned char *p;
|
const unsigned char *p;
|
const unsigned char *startaddr = addr;
|
const unsigned char *startaddr = addr;
|
const unsigned char *endaddr = startaddr + len;
|
const unsigned char *endaddr = startaddr + len;
|
|
|
if (len > (int) sizeof (ULONGEST))
|
if (len > (int) sizeof (ULONGEST))
|
error (_("\
|
error (_("\
|
That operation is not available on integers of more than %d bytes."),
|
That operation is not available on integers of more than %d bytes."),
|
(int) sizeof (ULONGEST));
|
(int) sizeof (ULONGEST));
|
|
|
/* Start at the most significant end of the integer, and work towards
|
/* Start at the most significant end of the integer, and work towards
|
the least significant. */
|
the least significant. */
|
retval = 0;
|
retval = 0;
|
if (byte_order == BFD_ENDIAN_BIG)
|
if (byte_order == BFD_ENDIAN_BIG)
|
{
|
{
|
for (p = startaddr; p < endaddr; ++p)
|
for (p = startaddr; p < endaddr; ++p)
|
retval = (retval << 8) | *p;
|
retval = (retval << 8) | *p;
|
}
|
}
|
else
|
else
|
{
|
{
|
for (p = endaddr - 1; p >= startaddr; --p)
|
for (p = endaddr - 1; p >= startaddr; --p)
|
retval = (retval << 8) | *p;
|
retval = (retval << 8) | *p;
|
}
|
}
|
return retval;
|
return retval;
|
}
|
}
|
|
|
/* Sometimes a long long unsigned integer can be extracted as a
|
/* Sometimes a long long unsigned integer can be extracted as a
|
LONGEST value. This is done so that we can print these values
|
LONGEST value. This is done so that we can print these values
|
better. If this integer can be converted to a LONGEST, this
|
better. If this integer can be converted to a LONGEST, this
|
function returns 1 and sets *PVAL. Otherwise it returns 0. */
|
function returns 1 and sets *PVAL. Otherwise it returns 0. */
|
|
|
int
|
int
|
extract_long_unsigned_integer (const gdb_byte *addr, int orig_len,
|
extract_long_unsigned_integer (const gdb_byte *addr, int orig_len,
|
enum bfd_endian byte_order, LONGEST *pval)
|
enum bfd_endian byte_order, LONGEST *pval)
|
{
|
{
|
const gdb_byte *p;
|
const gdb_byte *p;
|
const gdb_byte *first_addr;
|
const gdb_byte *first_addr;
|
int len;
|
int len;
|
|
|
len = orig_len;
|
len = orig_len;
|
if (byte_order == BFD_ENDIAN_BIG)
|
if (byte_order == BFD_ENDIAN_BIG)
|
{
|
{
|
for (p = addr;
|
for (p = addr;
|
len > (int) sizeof (LONGEST) && p < addr + orig_len;
|
len > (int) sizeof (LONGEST) && p < addr + orig_len;
|
p++)
|
p++)
|
{
|
{
|
if (*p == 0)
|
if (*p == 0)
|
len--;
|
len--;
|
else
|
else
|
break;
|
break;
|
}
|
}
|
first_addr = p;
|
first_addr = p;
|
}
|
}
|
else
|
else
|
{
|
{
|
first_addr = addr;
|
first_addr = addr;
|
for (p = addr + orig_len - 1;
|
for (p = addr + orig_len - 1;
|
len > (int) sizeof (LONGEST) && p >= addr;
|
len > (int) sizeof (LONGEST) && p >= addr;
|
p--)
|
p--)
|
{
|
{
|
if (*p == 0)
|
if (*p == 0)
|
len--;
|
len--;
|
else
|
else
|
break;
|
break;
|
}
|
}
|
}
|
}
|
|
|
if (len <= (int) sizeof (LONGEST))
|
if (len <= (int) sizeof (LONGEST))
|
{
|
{
|
*pval = (LONGEST) extract_unsigned_integer (first_addr,
|
*pval = (LONGEST) extract_unsigned_integer (first_addr,
|
sizeof (LONGEST),
|
sizeof (LONGEST),
|
byte_order);
|
byte_order);
|
return 1;
|
return 1;
|
}
|
}
|
|
|
return 0;
|
return 0;
|
}
|
}
|
|
|
|
|
/* Treat the bytes at BUF as a pointer of type TYPE, and return the
|
/* Treat the bytes at BUF as a pointer of type TYPE, and return the
|
address it represents. */
|
address it represents. */
|
CORE_ADDR
|
CORE_ADDR
|
extract_typed_address (const gdb_byte *buf, struct type *type)
|
extract_typed_address (const gdb_byte *buf, struct type *type)
|
{
|
{
|
if (TYPE_CODE (type) != TYPE_CODE_PTR
|
if (TYPE_CODE (type) != TYPE_CODE_PTR
|
&& TYPE_CODE (type) != TYPE_CODE_REF)
|
&& TYPE_CODE (type) != TYPE_CODE_REF)
|
internal_error (__FILE__, __LINE__,
|
internal_error (__FILE__, __LINE__,
|
_("extract_typed_address: "
|
_("extract_typed_address: "
|
"type is not a pointer or reference"));
|
"type is not a pointer or reference"));
|
|
|
return gdbarch_pointer_to_address (get_type_arch (type), type, buf);
|
return gdbarch_pointer_to_address (get_type_arch (type), type, buf);
|
}
|
}
|
|
|
/* All 'store' functions accept a host-format integer and store a
|
/* All 'store' functions accept a host-format integer and store a
|
target-format integer at ADDR which is LEN bytes long. */
|
target-format integer at ADDR which is LEN bytes long. */
|
|
|
void
|
void
|
store_signed_integer (gdb_byte *addr, int len,
|
store_signed_integer (gdb_byte *addr, int len,
|
enum bfd_endian byte_order, LONGEST val)
|
enum bfd_endian byte_order, LONGEST val)
|
{
|
{
|
gdb_byte *p;
|
gdb_byte *p;
|
gdb_byte *startaddr = addr;
|
gdb_byte *startaddr = addr;
|
gdb_byte *endaddr = startaddr + len;
|
gdb_byte *endaddr = startaddr + len;
|
|
|
/* Start at the least significant end of the integer, and work towards
|
/* Start at the least significant end of the integer, and work towards
|
the most significant. */
|
the most significant. */
|
if (byte_order == BFD_ENDIAN_BIG)
|
if (byte_order == BFD_ENDIAN_BIG)
|
{
|
{
|
for (p = endaddr - 1; p >= startaddr; --p)
|
for (p = endaddr - 1; p >= startaddr; --p)
|
{
|
{
|
*p = val & 0xff;
|
*p = val & 0xff;
|
val >>= 8;
|
val >>= 8;
|
}
|
}
|
}
|
}
|
else
|
else
|
{
|
{
|
for (p = startaddr; p < endaddr; ++p)
|
for (p = startaddr; p < endaddr; ++p)
|
{
|
{
|
*p = val & 0xff;
|
*p = val & 0xff;
|
val >>= 8;
|
val >>= 8;
|
}
|
}
|
}
|
}
|
}
|
}
|
|
|
void
|
void
|
store_unsigned_integer (gdb_byte *addr, int len,
|
store_unsigned_integer (gdb_byte *addr, int len,
|
enum bfd_endian byte_order, ULONGEST val)
|
enum bfd_endian byte_order, ULONGEST val)
|
{
|
{
|
unsigned char *p;
|
unsigned char *p;
|
unsigned char *startaddr = (unsigned char *) addr;
|
unsigned char *startaddr = (unsigned char *) addr;
|
unsigned char *endaddr = startaddr + len;
|
unsigned char *endaddr = startaddr + len;
|
|
|
/* Start at the least significant end of the integer, and work towards
|
/* Start at the least significant end of the integer, and work towards
|
the most significant. */
|
the most significant. */
|
if (byte_order == BFD_ENDIAN_BIG)
|
if (byte_order == BFD_ENDIAN_BIG)
|
{
|
{
|
for (p = endaddr - 1; p >= startaddr; --p)
|
for (p = endaddr - 1; p >= startaddr; --p)
|
{
|
{
|
*p = val & 0xff;
|
*p = val & 0xff;
|
val >>= 8;
|
val >>= 8;
|
}
|
}
|
}
|
}
|
else
|
else
|
{
|
{
|
for (p = startaddr; p < endaddr; ++p)
|
for (p = startaddr; p < endaddr; ++p)
|
{
|
{
|
*p = val & 0xff;
|
*p = val & 0xff;
|
val >>= 8;
|
val >>= 8;
|
}
|
}
|
}
|
}
|
}
|
}
|
|
|
/* Store the address ADDR as a pointer of type TYPE at BUF, in target
|
/* Store the address ADDR as a pointer of type TYPE at BUF, in target
|
form. */
|
form. */
|
void
|
void
|
store_typed_address (gdb_byte *buf, struct type *type, CORE_ADDR addr)
|
store_typed_address (gdb_byte *buf, struct type *type, CORE_ADDR addr)
|
{
|
{
|
if (TYPE_CODE (type) != TYPE_CODE_PTR
|
if (TYPE_CODE (type) != TYPE_CODE_PTR
|
&& TYPE_CODE (type) != TYPE_CODE_REF)
|
&& TYPE_CODE (type) != TYPE_CODE_REF)
|
internal_error (__FILE__, __LINE__,
|
internal_error (__FILE__, __LINE__,
|
_("store_typed_address: "
|
_("store_typed_address: "
|
"type is not a pointer or reference"));
|
"type is not a pointer or reference"));
|
|
|
gdbarch_address_to_pointer (get_type_arch (type), type, buf, addr);
|
gdbarch_address_to_pointer (get_type_arch (type), type, buf, addr);
|
}
|
}
|
|
|
|
|
|
|
/* Return a `value' with the contents of (virtual or cooked) register
|
/* Return a `value' with the contents of (virtual or cooked) register
|
REGNUM as found in the specified FRAME. The register's type is
|
REGNUM as found in the specified FRAME. The register's type is
|
determined by register_type(). */
|
determined by register_type(). */
|
|
|
struct value *
|
struct value *
|
value_of_register (int regnum, struct frame_info *frame)
|
value_of_register (int regnum, struct frame_info *frame)
|
{
|
{
|
struct gdbarch *gdbarch = get_frame_arch (frame);
|
struct gdbarch *gdbarch = get_frame_arch (frame);
|
CORE_ADDR addr;
|
CORE_ADDR addr;
|
int optim;
|
int optim;
|
struct value *reg_val;
|
struct value *reg_val;
|
int realnum;
|
int realnum;
|
gdb_byte raw_buffer[MAX_REGISTER_SIZE];
|
gdb_byte raw_buffer[MAX_REGISTER_SIZE];
|
enum lval_type lval;
|
enum lval_type lval;
|
|
|
/* User registers lie completely outside of the range of normal
|
/* User registers lie completely outside of the range of normal
|
registers. Catch them early so that the target never sees them. */
|
registers. Catch them early so that the target never sees them. */
|
if (regnum >= gdbarch_num_regs (gdbarch)
|
if (regnum >= gdbarch_num_regs (gdbarch)
|
+ gdbarch_num_pseudo_regs (gdbarch))
|
+ gdbarch_num_pseudo_regs (gdbarch))
|
return value_of_user_reg (regnum, frame);
|
return value_of_user_reg (regnum, frame);
|
|
|
frame_register (frame, regnum, &optim, &lval, &addr, &realnum, raw_buffer);
|
frame_register (frame, regnum, &optim, &lval, &addr, &realnum, raw_buffer);
|
|
|
reg_val = allocate_value (register_type (gdbarch, regnum));
|
reg_val = allocate_value (register_type (gdbarch, regnum));
|
|
|
memcpy (value_contents_raw (reg_val), raw_buffer,
|
memcpy (value_contents_raw (reg_val), raw_buffer,
|
register_size (gdbarch, regnum));
|
register_size (gdbarch, regnum));
|
VALUE_LVAL (reg_val) = lval;
|
VALUE_LVAL (reg_val) = lval;
|
set_value_address (reg_val, addr);
|
set_value_address (reg_val, addr);
|
VALUE_REGNUM (reg_val) = regnum;
|
VALUE_REGNUM (reg_val) = regnum;
|
set_value_optimized_out (reg_val, optim);
|
set_value_optimized_out (reg_val, optim);
|
VALUE_FRAME_ID (reg_val) = get_frame_id (frame);
|
VALUE_FRAME_ID (reg_val) = get_frame_id (frame);
|
return reg_val;
|
return reg_val;
|
}
|
}
|
|
|
/* Return a `value' with the contents of (virtual or cooked) register
|
/* Return a `value' with the contents of (virtual or cooked) register
|
REGNUM as found in the specified FRAME. The register's type is
|
REGNUM as found in the specified FRAME. The register's type is
|
determined by register_type(). The value is not fetched. */
|
determined by register_type(). The value is not fetched. */
|
|
|
struct value *
|
struct value *
|
value_of_register_lazy (struct frame_info *frame, int regnum)
|
value_of_register_lazy (struct frame_info *frame, int regnum)
|
{
|
{
|
struct gdbarch *gdbarch = get_frame_arch (frame);
|
struct gdbarch *gdbarch = get_frame_arch (frame);
|
struct value *reg_val;
|
struct value *reg_val;
|
|
|
gdb_assert (regnum < (gdbarch_num_regs (gdbarch)
|
gdb_assert (regnum < (gdbarch_num_regs (gdbarch)
|
+ gdbarch_num_pseudo_regs (gdbarch)));
|
+ gdbarch_num_pseudo_regs (gdbarch)));
|
|
|
/* We should have a valid (i.e. non-sentinel) frame. */
|
/* We should have a valid (i.e. non-sentinel) frame. */
|
gdb_assert (frame_id_p (get_frame_id (frame)));
|
gdb_assert (frame_id_p (get_frame_id (frame)));
|
|
|
reg_val = allocate_value (register_type (gdbarch, regnum));
|
reg_val = allocate_value (register_type (gdbarch, regnum));
|
VALUE_LVAL (reg_val) = lval_register;
|
VALUE_LVAL (reg_val) = lval_register;
|
VALUE_REGNUM (reg_val) = regnum;
|
VALUE_REGNUM (reg_val) = regnum;
|
VALUE_FRAME_ID (reg_val) = get_frame_id (frame);
|
VALUE_FRAME_ID (reg_val) = get_frame_id (frame);
|
set_value_lazy (reg_val, 1);
|
set_value_lazy (reg_val, 1);
|
return reg_val;
|
return reg_val;
|
}
|
}
|
|
|
/* Given a pointer of type TYPE in target form in BUF, return the
|
/* Given a pointer of type TYPE in target form in BUF, return the
|
address it represents. */
|
address it represents. */
|
CORE_ADDR
|
CORE_ADDR
|
unsigned_pointer_to_address (struct gdbarch *gdbarch,
|
unsigned_pointer_to_address (struct gdbarch *gdbarch,
|
struct type *type, const gdb_byte *buf)
|
struct type *type, const gdb_byte *buf)
|
{
|
{
|
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
|
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
|
return extract_unsigned_integer (buf, TYPE_LENGTH (type), byte_order);
|
return extract_unsigned_integer (buf, TYPE_LENGTH (type), byte_order);
|
}
|
}
|
|
|
CORE_ADDR
|
CORE_ADDR
|
signed_pointer_to_address (struct gdbarch *gdbarch,
|
signed_pointer_to_address (struct gdbarch *gdbarch,
|
struct type *type, const gdb_byte *buf)
|
struct type *type, const gdb_byte *buf)
|
{
|
{
|
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
|
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
|
return extract_signed_integer (buf, TYPE_LENGTH (type), byte_order);
|
return extract_signed_integer (buf, TYPE_LENGTH (type), byte_order);
|
}
|
}
|
|
|
/* Given an address, store it as a pointer of type TYPE in target
|
/* Given an address, store it as a pointer of type TYPE in target
|
format in BUF. */
|
format in BUF. */
|
void
|
void
|
unsigned_address_to_pointer (struct gdbarch *gdbarch, struct type *type,
|
unsigned_address_to_pointer (struct gdbarch *gdbarch, struct type *type,
|
gdb_byte *buf, CORE_ADDR addr)
|
gdb_byte *buf, CORE_ADDR addr)
|
{
|
{
|
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
|
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
|
store_unsigned_integer (buf, TYPE_LENGTH (type), byte_order, addr);
|
store_unsigned_integer (buf, TYPE_LENGTH (type), byte_order, addr);
|
}
|
}
|
|
|
void
|
void
|
address_to_signed_pointer (struct gdbarch *gdbarch, struct type *type,
|
address_to_signed_pointer (struct gdbarch *gdbarch, struct type *type,
|
gdb_byte *buf, CORE_ADDR addr)
|
gdb_byte *buf, CORE_ADDR addr)
|
{
|
{
|
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
|
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
|
store_signed_integer (buf, TYPE_LENGTH (type), byte_order, addr);
|
store_signed_integer (buf, TYPE_LENGTH (type), byte_order, addr);
|
}
|
}
|
|
|
/* Will calling read_var_value or locate_var_value on SYM end
|
/* Will calling read_var_value or locate_var_value on SYM end
|
up caring what frame it is being evaluated relative to? SYM must
|
up caring what frame it is being evaluated relative to? SYM must
|
be non-NULL. */
|
be non-NULL. */
|
int
|
int
|
symbol_read_needs_frame (struct symbol *sym)
|
symbol_read_needs_frame (struct symbol *sym)
|
{
|
{
|
switch (SYMBOL_CLASS (sym))
|
switch (SYMBOL_CLASS (sym))
|
{
|
{
|
/* All cases listed explicitly so that gcc -Wall will detect it if
|
/* All cases listed explicitly so that gcc -Wall will detect it if
|
we failed to consider one. */
|
we failed to consider one. */
|
case LOC_COMPUTED:
|
case LOC_COMPUTED:
|
/* FIXME: cagney/2004-01-26: It should be possible to
|
/* FIXME: cagney/2004-01-26: It should be possible to
|
unconditionally call the SYMBOL_COMPUTED_OPS method when available.
|
unconditionally call the SYMBOL_COMPUTED_OPS method when available.
|
Unfortunately DWARF 2 stores the frame-base (instead of the
|
Unfortunately DWARF 2 stores the frame-base (instead of the
|
function) location in a function's symbol. Oops! For the
|
function) location in a function's symbol. Oops! For the
|
moment enable this when/where applicable. */
|
moment enable this when/where applicable. */
|
return SYMBOL_COMPUTED_OPS (sym)->read_needs_frame (sym);
|
return SYMBOL_COMPUTED_OPS (sym)->read_needs_frame (sym);
|
|
|
case LOC_REGISTER:
|
case LOC_REGISTER:
|
case LOC_ARG:
|
case LOC_ARG:
|
case LOC_REF_ARG:
|
case LOC_REF_ARG:
|
case LOC_REGPARM_ADDR:
|
case LOC_REGPARM_ADDR:
|
case LOC_LOCAL:
|
case LOC_LOCAL:
|
return 1;
|
return 1;
|
|
|
case LOC_UNDEF:
|
case LOC_UNDEF:
|
case LOC_CONST:
|
case LOC_CONST:
|
case LOC_STATIC:
|
case LOC_STATIC:
|
case LOC_TYPEDEF:
|
case LOC_TYPEDEF:
|
|
|
case LOC_LABEL:
|
case LOC_LABEL:
|
/* Getting the address of a label can be done independently of the block,
|
/* Getting the address of a label can be done independently of the block,
|
even if some *uses* of that address wouldn't work so well without
|
even if some *uses* of that address wouldn't work so well without
|
the right frame. */
|
the right frame. */
|
|
|
case LOC_BLOCK:
|
case LOC_BLOCK:
|
case LOC_CONST_BYTES:
|
case LOC_CONST_BYTES:
|
case LOC_UNRESOLVED:
|
case LOC_UNRESOLVED:
|
case LOC_OPTIMIZED_OUT:
|
case LOC_OPTIMIZED_OUT:
|
return 0;
|
return 0;
|
}
|
}
|
return 1;
|
return 1;
|
}
|
}
|
|
|
/* Given a struct symbol for a variable,
|
/* Given a struct symbol for a variable,
|
and a stack frame id, read the value of the variable
|
and a stack frame id, read the value of the variable
|
and return a (pointer to a) struct value containing the value.
|
and return a (pointer to a) struct value containing the value.
|
If the variable cannot be found, return a zero pointer. */
|
If the variable cannot be found, return a zero pointer. */
|
|
|
struct value *
|
struct value *
|
read_var_value (struct symbol *var, struct frame_info *frame)
|
read_var_value (struct symbol *var, struct frame_info *frame)
|
{
|
{
|
struct value *v;
|
struct value *v;
|
struct type *type = SYMBOL_TYPE (var);
|
struct type *type = SYMBOL_TYPE (var);
|
CORE_ADDR addr;
|
CORE_ADDR addr;
|
int len;
|
int len;
|
|
|
if (SYMBOL_CLASS (var) == LOC_COMPUTED
|
if (SYMBOL_CLASS (var) == LOC_COMPUTED
|
|| SYMBOL_CLASS (var) == LOC_REGISTER)
|
|| SYMBOL_CLASS (var) == LOC_REGISTER)
|
/* These cases do not use V. */
|
/* These cases do not use V. */
|
v = NULL;
|
v = NULL;
|
else
|
else
|
{
|
{
|
v = allocate_value (type);
|
v = allocate_value (type);
|
VALUE_LVAL (v) = lval_memory; /* The most likely possibility. */
|
VALUE_LVAL (v) = lval_memory; /* The most likely possibility. */
|
}
|
}
|
|
|
len = TYPE_LENGTH (type);
|
len = TYPE_LENGTH (type);
|
|
|
if (symbol_read_needs_frame (var))
|
if (symbol_read_needs_frame (var))
|
gdb_assert (frame);
|
gdb_assert (frame);
|
|
|
switch (SYMBOL_CLASS (var))
|
switch (SYMBOL_CLASS (var))
|
{
|
{
|
case LOC_CONST:
|
case LOC_CONST:
|
/* Put the constant back in target format. */
|
/* Put the constant back in target format. */
|
store_signed_integer (value_contents_raw (v), len,
|
store_signed_integer (value_contents_raw (v), len,
|
gdbarch_byte_order (get_type_arch (type)),
|
gdbarch_byte_order (get_type_arch (type)),
|
(LONGEST) SYMBOL_VALUE (var));
|
(LONGEST) SYMBOL_VALUE (var));
|
VALUE_LVAL (v) = not_lval;
|
VALUE_LVAL (v) = not_lval;
|
return v;
|
return v;
|
|
|
case LOC_LABEL:
|
case LOC_LABEL:
|
/* Put the constant back in target format. */
|
/* Put the constant back in target format. */
|
if (overlay_debugging)
|
if (overlay_debugging)
|
{
|
{
|
CORE_ADDR addr
|
CORE_ADDR addr
|
= symbol_overlayed_address (SYMBOL_VALUE_ADDRESS (var),
|
= symbol_overlayed_address (SYMBOL_VALUE_ADDRESS (var),
|
SYMBOL_OBJ_SECTION (var));
|
SYMBOL_OBJ_SECTION (var));
|
store_typed_address (value_contents_raw (v), type, addr);
|
store_typed_address (value_contents_raw (v), type, addr);
|
}
|
}
|
else
|
else
|
store_typed_address (value_contents_raw (v), type,
|
store_typed_address (value_contents_raw (v), type,
|
SYMBOL_VALUE_ADDRESS (var));
|
SYMBOL_VALUE_ADDRESS (var));
|
VALUE_LVAL (v) = not_lval;
|
VALUE_LVAL (v) = not_lval;
|
return v;
|
return v;
|
|
|
case LOC_CONST_BYTES:
|
case LOC_CONST_BYTES:
|
{
|
{
|
memcpy (value_contents_raw (v), SYMBOL_VALUE_BYTES (var), len);
|
memcpy (value_contents_raw (v), SYMBOL_VALUE_BYTES (var), len);
|
VALUE_LVAL (v) = not_lval;
|
VALUE_LVAL (v) = not_lval;
|
return v;
|
return v;
|
}
|
}
|
|
|
case LOC_STATIC:
|
case LOC_STATIC:
|
if (overlay_debugging)
|
if (overlay_debugging)
|
addr = symbol_overlayed_address (SYMBOL_VALUE_ADDRESS (var),
|
addr = symbol_overlayed_address (SYMBOL_VALUE_ADDRESS (var),
|
SYMBOL_OBJ_SECTION (var));
|
SYMBOL_OBJ_SECTION (var));
|
else
|
else
|
addr = SYMBOL_VALUE_ADDRESS (var);
|
addr = SYMBOL_VALUE_ADDRESS (var);
|
break;
|
break;
|
|
|
case LOC_ARG:
|
case LOC_ARG:
|
addr = get_frame_args_address (frame);
|
addr = get_frame_args_address (frame);
|
if (!addr)
|
if (!addr)
|
return 0;
|
return 0;
|
addr += SYMBOL_VALUE (var);
|
addr += SYMBOL_VALUE (var);
|
break;
|
break;
|
|
|
case LOC_REF_ARG:
|
case LOC_REF_ARG:
|
{
|
{
|
struct value *ref;
|
struct value *ref;
|
CORE_ADDR argref;
|
CORE_ADDR argref;
|
argref = get_frame_args_address (frame);
|
argref = get_frame_args_address (frame);
|
if (!argref)
|
if (!argref)
|
return 0;
|
return 0;
|
argref += SYMBOL_VALUE (var);
|
argref += SYMBOL_VALUE (var);
|
ref = value_at (lookup_pointer_type (type), argref);
|
ref = value_at (lookup_pointer_type (type), argref);
|
addr = value_as_address (ref);
|
addr = value_as_address (ref);
|
break;
|
break;
|
}
|
}
|
|
|
case LOC_LOCAL:
|
case LOC_LOCAL:
|
addr = get_frame_locals_address (frame);
|
addr = get_frame_locals_address (frame);
|
addr += SYMBOL_VALUE (var);
|
addr += SYMBOL_VALUE (var);
|
break;
|
break;
|
|
|
case LOC_TYPEDEF:
|
case LOC_TYPEDEF:
|
error (_("Cannot look up value of a typedef"));
|
error (_("Cannot look up value of a typedef"));
|
break;
|
break;
|
|
|
case LOC_BLOCK:
|
case LOC_BLOCK:
|
if (overlay_debugging)
|
if (overlay_debugging)
|
set_value_address (v, symbol_overlayed_address
|
set_value_address (v, symbol_overlayed_address
|
(BLOCK_START (SYMBOL_BLOCK_VALUE (var)), SYMBOL_OBJ_SECTION (var)));
|
(BLOCK_START (SYMBOL_BLOCK_VALUE (var)), SYMBOL_OBJ_SECTION (var)));
|
else
|
else
|
set_value_address (v, BLOCK_START (SYMBOL_BLOCK_VALUE (var)));
|
set_value_address (v, BLOCK_START (SYMBOL_BLOCK_VALUE (var)));
|
return v;
|
return v;
|
|
|
case LOC_REGISTER:
|
case LOC_REGISTER:
|
case LOC_REGPARM_ADDR:
|
case LOC_REGPARM_ADDR:
|
{
|
{
|
int regno = SYMBOL_REGISTER_OPS (var)
|
int regno = SYMBOL_REGISTER_OPS (var)
|
->register_number (var, get_frame_arch (frame));
|
->register_number (var, get_frame_arch (frame));
|
struct value *regval;
|
struct value *regval;
|
|
|
if (SYMBOL_CLASS (var) == LOC_REGPARM_ADDR)
|
if (SYMBOL_CLASS (var) == LOC_REGPARM_ADDR)
|
{
|
{
|
regval = value_from_register (lookup_pointer_type (type),
|
regval = value_from_register (lookup_pointer_type (type),
|
regno,
|
regno,
|
frame);
|
frame);
|
|
|
if (regval == NULL)
|
if (regval == NULL)
|
error (_("Value of register variable not available."));
|
error (_("Value of register variable not available."));
|
|
|
addr = value_as_address (regval);
|
addr = value_as_address (regval);
|
VALUE_LVAL (v) = lval_memory;
|
VALUE_LVAL (v) = lval_memory;
|
}
|
}
|
else
|
else
|
{
|
{
|
regval = value_from_register (type, regno, frame);
|
regval = value_from_register (type, regno, frame);
|
|
|
if (regval == NULL)
|
if (regval == NULL)
|
error (_("Value of register variable not available."));
|
error (_("Value of register variable not available."));
|
return regval;
|
return regval;
|
}
|
}
|
}
|
}
|
break;
|
break;
|
|
|
case LOC_COMPUTED:
|
case LOC_COMPUTED:
|
/* FIXME: cagney/2004-01-26: It should be possible to
|
/* FIXME: cagney/2004-01-26: It should be possible to
|
unconditionally call the SYMBOL_COMPUTED_OPS method when available.
|
unconditionally call the SYMBOL_COMPUTED_OPS method when available.
|
Unfortunately DWARF 2 stores the frame-base (instead of the
|
Unfortunately DWARF 2 stores the frame-base (instead of the
|
function) location in a function's symbol. Oops! For the
|
function) location in a function's symbol. Oops! For the
|
moment enable this when/where applicable. */
|
moment enable this when/where applicable. */
|
return SYMBOL_COMPUTED_OPS (var)->read_variable (var, frame);
|
return SYMBOL_COMPUTED_OPS (var)->read_variable (var, frame);
|
|
|
case LOC_UNRESOLVED:
|
case LOC_UNRESOLVED:
|
{
|
{
|
struct minimal_symbol *msym;
|
struct minimal_symbol *msym;
|
struct obj_section *obj_section;
|
struct obj_section *obj_section;
|
|
|
msym = lookup_minimal_symbol (SYMBOL_LINKAGE_NAME (var), NULL, NULL);
|
msym = lookup_minimal_symbol (SYMBOL_LINKAGE_NAME (var), NULL, NULL);
|
if (msym == NULL)
|
if (msym == NULL)
|
return 0;
|
return 0;
|
if (overlay_debugging)
|
if (overlay_debugging)
|
addr = symbol_overlayed_address (SYMBOL_VALUE_ADDRESS (msym),
|
addr = symbol_overlayed_address (SYMBOL_VALUE_ADDRESS (msym),
|
SYMBOL_OBJ_SECTION (msym));
|
SYMBOL_OBJ_SECTION (msym));
|
else
|
else
|
addr = SYMBOL_VALUE_ADDRESS (msym);
|
addr = SYMBOL_VALUE_ADDRESS (msym);
|
|
|
obj_section = SYMBOL_OBJ_SECTION (msym);
|
obj_section = SYMBOL_OBJ_SECTION (msym);
|
if (obj_section
|
if (obj_section
|
&& (obj_section->the_bfd_section->flags & SEC_THREAD_LOCAL) != 0)
|
&& (obj_section->the_bfd_section->flags & SEC_THREAD_LOCAL) != 0)
|
addr = target_translate_tls_address (obj_section->objfile, addr);
|
addr = target_translate_tls_address (obj_section->objfile, addr);
|
}
|
}
|
break;
|
break;
|
|
|
case LOC_OPTIMIZED_OUT:
|
case LOC_OPTIMIZED_OUT:
|
VALUE_LVAL (v) = not_lval;
|
VALUE_LVAL (v) = not_lval;
|
set_value_optimized_out (v, 1);
|
set_value_optimized_out (v, 1);
|
return v;
|
return v;
|
|
|
default:
|
default:
|
error (_("Cannot look up value of a botched symbol."));
|
error (_("Cannot look up value of a botched symbol."));
|
break;
|
break;
|
}
|
}
|
|
|
set_value_address (v, addr);
|
set_value_address (v, addr);
|
set_value_lazy (v, 1);
|
set_value_lazy (v, 1);
|
return v;
|
return v;
|
}
|
}
|
|
|
/* Install default attributes for register values. */
|
/* Install default attributes for register values. */
|
|
|
struct value *
|
struct value *
|
default_value_from_register (struct type *type, int regnum,
|
default_value_from_register (struct type *type, int regnum,
|
struct frame_info *frame)
|
struct frame_info *frame)
|
{
|
{
|
struct gdbarch *gdbarch = get_frame_arch (frame);
|
struct gdbarch *gdbarch = get_frame_arch (frame);
|
int len = TYPE_LENGTH (type);
|
int len = TYPE_LENGTH (type);
|
struct value *value = allocate_value (type);
|
struct value *value = allocate_value (type);
|
|
|
VALUE_LVAL (value) = lval_register;
|
VALUE_LVAL (value) = lval_register;
|
VALUE_FRAME_ID (value) = get_frame_id (frame);
|
VALUE_FRAME_ID (value) = get_frame_id (frame);
|
VALUE_REGNUM (value) = regnum;
|
VALUE_REGNUM (value) = regnum;
|
|
|
/* Any structure stored in more than one register will always be
|
/* Any structure stored in more than one register will always be
|
an integral number of registers. Otherwise, you need to do
|
an integral number of registers. Otherwise, you need to do
|
some fiddling with the last register copied here for little
|
some fiddling with the last register copied here for little
|
endian machines. */
|
endian machines. */
|
if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG
|
if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG
|
&& len < register_size (gdbarch, regnum))
|
&& len < register_size (gdbarch, regnum))
|
/* Big-endian, and we want less than full size. */
|
/* Big-endian, and we want less than full size. */
|
set_value_offset (value, register_size (gdbarch, regnum) - len);
|
set_value_offset (value, register_size (gdbarch, regnum) - len);
|
else
|
else
|
set_value_offset (value, 0);
|
set_value_offset (value, 0);
|
|
|
return value;
|
return value;
|
}
|
}
|
|
|
/* Return a value of type TYPE, stored in register REGNUM, in frame FRAME. */
|
/* Return a value of type TYPE, stored in register REGNUM, in frame FRAME. */
|
|
|
struct value *
|
struct value *
|
value_from_register (struct type *type, int regnum, struct frame_info *frame)
|
value_from_register (struct type *type, int regnum, struct frame_info *frame)
|
{
|
{
|
struct gdbarch *gdbarch = get_frame_arch (frame);
|
struct gdbarch *gdbarch = get_frame_arch (frame);
|
struct type *type1 = check_typedef (type);
|
struct type *type1 = check_typedef (type);
|
struct value *v;
|
struct value *v;
|
|
|
if (gdbarch_convert_register_p (gdbarch, regnum, type1))
|
if (gdbarch_convert_register_p (gdbarch, regnum, type1))
|
{
|
{
|
/* The ISA/ABI need to something weird when obtaining the
|
/* The ISA/ABI need to something weird when obtaining the
|
specified value from this register. It might need to
|
specified value from this register. It might need to
|
re-order non-adjacent, starting with REGNUM (see MIPS and
|
re-order non-adjacent, starting with REGNUM (see MIPS and
|
i386). It might need to convert the [float] register into
|
i386). It might need to convert the [float] register into
|
the corresponding [integer] type (see Alpha). The assumption
|
the corresponding [integer] type (see Alpha). The assumption
|
is that gdbarch_register_to_value populates the entire value
|
is that gdbarch_register_to_value populates the entire value
|
including the location. */
|
including the location. */
|
v = allocate_value (type);
|
v = allocate_value (type);
|
VALUE_LVAL (v) = lval_register;
|
VALUE_LVAL (v) = lval_register;
|
VALUE_FRAME_ID (v) = get_frame_id (frame);
|
VALUE_FRAME_ID (v) = get_frame_id (frame);
|
VALUE_REGNUM (v) = regnum;
|
VALUE_REGNUM (v) = regnum;
|
gdbarch_register_to_value (gdbarch,
|
gdbarch_register_to_value (gdbarch,
|
frame, regnum, type1, value_contents_raw (v));
|
frame, regnum, type1, value_contents_raw (v));
|
}
|
}
|
else
|
else
|
{
|
{
|
int len = TYPE_LENGTH (type);
|
int len = TYPE_LENGTH (type);
|
|
|
/* Construct the value. */
|
/* Construct the value. */
|
v = gdbarch_value_from_register (gdbarch, type, regnum, frame);
|
v = gdbarch_value_from_register (gdbarch, type, regnum, frame);
|
|
|
/* Get the data. */
|
/* Get the data. */
|
if (!get_frame_register_bytes (frame, regnum, value_offset (v), len,
|
if (!get_frame_register_bytes (frame, regnum, value_offset (v), len,
|
value_contents_raw (v)))
|
value_contents_raw (v)))
|
set_value_optimized_out (v, 1);
|
set_value_optimized_out (v, 1);
|
}
|
}
|
return v;
|
return v;
|
}
|
}
|
|
|
/* Return contents of register REGNUM in frame FRAME as address,
|
/* Return contents of register REGNUM in frame FRAME as address,
|
interpreted as value of type TYPE. Will abort if register
|
interpreted as value of type TYPE. Will abort if register
|
value is not available. */
|
value is not available. */
|
|
|
CORE_ADDR
|
CORE_ADDR
|
address_from_register (struct type *type, int regnum, struct frame_info *frame)
|
address_from_register (struct type *type, int regnum, struct frame_info *frame)
|
{
|
{
|
struct value *value;
|
struct value *value;
|
CORE_ADDR result;
|
CORE_ADDR result;
|
|
|
value = value_from_register (type, regnum, frame);
|
value = value_from_register (type, regnum, frame);
|
gdb_assert (value);
|
gdb_assert (value);
|
|
|
result = value_as_address (value);
|
result = value_as_address (value);
|
release_value (value);
|
release_value (value);
|
value_free (value);
|
value_free (value);
|
|
|
return result;
|
return result;
|
}
|
}
|
|
|
