/* Find a variable's value in memory, for GDB, the GNU debugger.
Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
- 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2004, 2005, 2007
- Free Software Foundation, Inc.
+ 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2004, 2005, 2007, 2008, 2009,
+ 2010, 2011 Free Software Foundation, Inc.
This file is part of GDB.
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
- the Free Software Foundation; either version 2 of the License, or
+ the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 51 Franklin Street, Fifth Floor,
- Boston, MA 02110-1301, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "symtab.h"
#include "regcache.h"
#include "user-regs.h"
#include "block.h"
+#include "objfiles.h"
-/* Basic byte-swapping routines. GDB has needed these for a long time...
- All extract a target-format integer at ADDR which is LEN bytes long. */
+/* Basic byte-swapping routines. All 'extract' functions return a
+ host-format integer from a target-format integer at ADDR which is
+ LEN bytes long. */
#if TARGET_CHAR_BIT != 8 || HOST_CHAR_BIT != 8
/* 8 bit characters are a pretty safe assumption these days, so we
#endif
LONGEST
-extract_signed_integer (const gdb_byte *addr, int len)
+extract_signed_integer (const gdb_byte *addr, int len,
+ enum bfd_endian byte_order)
{
LONGEST retval;
const unsigned char *p;
/* Start at the most significant end of the integer, and work towards
the least significant. */
- if (gdbarch_byte_order (current_gdbarch) == BFD_ENDIAN_BIG)
+ if (byte_order == BFD_ENDIAN_BIG)
{
p = startaddr;
/* Do the sign extension once at the start. */
}
ULONGEST
-extract_unsigned_integer (const gdb_byte *addr, int len)
+extract_unsigned_integer (const gdb_byte *addr, int len,
+ enum bfd_endian byte_order)
{
ULONGEST retval;
const unsigned char *p;
/* Start at the most significant end of the integer, and work towards
the least significant. */
retval = 0;
- if (gdbarch_byte_order (current_gdbarch) == BFD_ENDIAN_BIG)
+ if (byte_order == BFD_ENDIAN_BIG)
{
for (p = startaddr; p < endaddr; ++p)
retval = (retval << 8) | *p;
int
extract_long_unsigned_integer (const gdb_byte *addr, int orig_len,
- LONGEST *pval)
+ enum bfd_endian byte_order, LONGEST *pval)
{
const gdb_byte *p;
const gdb_byte *first_addr;
int len;
len = orig_len;
- if (gdbarch_byte_order (current_gdbarch) == BFD_ENDIAN_BIG)
+ if (byte_order == BFD_ENDIAN_BIG)
{
for (p = addr;
len > (int) sizeof (LONGEST) && p < addr + orig_len;
if (len <= (int) sizeof (LONGEST))
{
*pval = (LONGEST) extract_unsigned_integer (first_addr,
- sizeof (LONGEST));
+ sizeof (LONGEST),
+ byte_order);
return 1;
}
_("extract_typed_address: "
"type is not a pointer or reference"));
- return gdbarch_pointer_to_address (current_gdbarch, type, buf);
+ return gdbarch_pointer_to_address (get_type_arch (type), type, buf);
}
+/* All 'store' functions accept a host-format integer and store a
+ target-format integer at ADDR which is LEN bytes long. */
void
-store_signed_integer (gdb_byte *addr, int len, LONGEST val)
+store_signed_integer (gdb_byte *addr, int len,
+ enum bfd_endian byte_order, LONGEST val)
{
gdb_byte *p;
gdb_byte *startaddr = addr;
/* Start at the least significant end of the integer, and work towards
the most significant. */
- if (gdbarch_byte_order (current_gdbarch) == BFD_ENDIAN_BIG)
+ if (byte_order == BFD_ENDIAN_BIG)
{
for (p = endaddr - 1; p >= startaddr; --p)
{
}
void
-store_unsigned_integer (gdb_byte *addr, int len, ULONGEST val)
+store_unsigned_integer (gdb_byte *addr, int len,
+ enum bfd_endian byte_order, ULONGEST val)
{
unsigned char *p;
unsigned char *startaddr = (unsigned char *) addr;
/* Start at the least significant end of the integer, and work towards
the most significant. */
- if (gdbarch_byte_order (current_gdbarch) == BFD_ENDIAN_BIG)
+ if (byte_order == BFD_ENDIAN_BIG)
{
for (p = endaddr - 1; p >= startaddr; --p)
{
_("store_typed_address: "
"type is not a pointer or reference"));
- gdbarch_address_to_pointer (current_gdbarch, type, buf, addr);
+ gdbarch_address_to_pointer (get_type_arch (type), type, buf, addr);
}
struct value *
value_of_register (int regnum, struct frame_info *frame)
{
+ struct gdbarch *gdbarch = get_frame_arch (frame);
CORE_ADDR addr;
int optim;
struct value *reg_val;
/* User registers lie completely outside of the range of normal
registers. Catch them early so that the target never sees them. */
- if (regnum >= gdbarch_num_regs (current_gdbarch)
- + gdbarch_num_pseudo_regs (current_gdbarch))
+ if (regnum >= gdbarch_num_regs (gdbarch)
+ + gdbarch_num_pseudo_regs (gdbarch))
return value_of_user_reg (regnum, frame);
frame_register (frame, regnum, &optim, &lval, &addr, &realnum, raw_buffer);
- reg_val = allocate_value (register_type (current_gdbarch, regnum));
+ reg_val = allocate_value (register_type (gdbarch, regnum));
memcpy (value_contents_raw (reg_val), raw_buffer,
- register_size (current_gdbarch, regnum));
+ register_size (gdbarch, regnum));
VALUE_LVAL (reg_val) = lval;
- VALUE_ADDRESS (reg_val) = addr;
+ set_value_address (reg_val, addr);
VALUE_REGNUM (reg_val) = regnum;
set_value_optimized_out (reg_val, optim);
VALUE_FRAME_ID (reg_val) = get_frame_id (frame);
return reg_val;
}
+/* Return a `value' with the contents of (virtual or cooked) register
+ REGNUM as found in the specified FRAME. The register's type is
+ determined by register_type(). The value is not fetched. */
+
+struct value *
+value_of_register_lazy (struct frame_info *frame, int regnum)
+{
+ struct gdbarch *gdbarch = get_frame_arch (frame);
+ struct value *reg_val;
+
+ gdb_assert (regnum < (gdbarch_num_regs (gdbarch)
+ + gdbarch_num_pseudo_regs (gdbarch)));
+
+ /* We should have a valid (i.e. non-sentinel) frame. */
+ gdb_assert (frame_id_p (get_frame_id (frame)));
+
+ reg_val = allocate_value_lazy (register_type (gdbarch, regnum));
+ VALUE_LVAL (reg_val) = lval_register;
+ VALUE_REGNUM (reg_val) = regnum;
+ VALUE_FRAME_ID (reg_val) = get_frame_id (frame);
+ return reg_val;
+}
+
/* Given a pointer of type TYPE in target form in BUF, return the
address it represents. */
CORE_ADDR
-unsigned_pointer_to_address (struct type *type, const gdb_byte *buf)
+unsigned_pointer_to_address (struct gdbarch *gdbarch,
+ struct type *type, const gdb_byte *buf)
{
- return extract_unsigned_integer (buf, TYPE_LENGTH (type));
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+
+ return extract_unsigned_integer (buf, TYPE_LENGTH (type), byte_order);
}
CORE_ADDR
-signed_pointer_to_address (struct type *type, const gdb_byte *buf)
+signed_pointer_to_address (struct gdbarch *gdbarch,
+ struct type *type, const gdb_byte *buf)
{
- return extract_signed_integer (buf, TYPE_LENGTH (type));
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+
+ return extract_signed_integer (buf, TYPE_LENGTH (type), byte_order);
}
/* Given an address, store it as a pointer of type TYPE in target
format in BUF. */
void
-unsigned_address_to_pointer (struct type *type, gdb_byte *buf,
- CORE_ADDR addr)
+unsigned_address_to_pointer (struct gdbarch *gdbarch, struct type *type,
+ gdb_byte *buf, CORE_ADDR addr)
{
- store_unsigned_integer (buf, TYPE_LENGTH (type), addr);
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+
+ store_unsigned_integer (buf, TYPE_LENGTH (type), byte_order, addr);
}
void
-address_to_signed_pointer (struct type *type, gdb_byte *buf, CORE_ADDR addr)
+address_to_signed_pointer (struct gdbarch *gdbarch, struct type *type,
+ gdb_byte *buf, CORE_ADDR addr)
{
- store_signed_integer (buf, TYPE_LENGTH (type), addr);
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+
+ store_signed_integer (buf, TYPE_LENGTH (type), byte_order, addr);
}
\f
/* Will calling read_var_value or locate_var_value on SYM end
/* All cases listed explicitly so that gcc -Wall will detect it if
we failed to consider one. */
case LOC_COMPUTED:
- case LOC_COMPUTED_ARG:
/* FIXME: cagney/2004-01-26: It should be possible to
- unconditionally call the SYMBOL_OPS method when available.
+ unconditionally call the SYMBOL_COMPUTED_OPS method when available.
Unfortunately DWARF 2 stores the frame-base (instead of the
function) location in a function's symbol. Oops! For the
moment enable this when/where applicable. */
- return SYMBOL_OPS (sym)->read_needs_frame (sym);
+ return SYMBOL_COMPUTED_OPS (sym)->read_needs_frame (sym);
case LOC_REGISTER:
case LOC_ARG:
case LOC_REF_ARG:
- case LOC_REGPARM:
case LOC_REGPARM_ADDR:
case LOC_LOCAL:
- case LOC_LOCAL_ARG:
- case LOC_BASEREG:
- case LOC_BASEREG_ARG:
- case LOC_HP_THREAD_LOCAL_STATIC:
return 1;
case LOC_UNDEF:
case LOC_CONST:
case LOC_STATIC:
- case LOC_INDIRECT:
case LOC_TYPEDEF:
case LOC_LABEL:
/* Given a struct symbol for a variable,
and a stack frame id, read the value of the variable
- and return a (pointer to a) struct value containing the value.
- If the variable cannot be found, return a zero pointer.
- If FRAME is NULL, use the selected frame. */
+ and return a (pointer to a) struct value containing the value.
+ If the variable cannot be found, return a zero pointer. */
struct value *
read_var_value (struct symbol *var, struct frame_info *frame)
CORE_ADDR addr;
int len;
- if (SYMBOL_CLASS (var) == LOC_COMPUTED
- || SYMBOL_CLASS (var) == LOC_COMPUTED_ARG
- || SYMBOL_CLASS (var) == LOC_REGISTER
- || SYMBOL_CLASS (var) == LOC_REGPARM)
- /* These cases do not use V. */
- v = NULL;
- else
- {
- v = allocate_value (type);
- VALUE_LVAL (v) = lval_memory; /* The most likely possibility. */
- }
+ /* Call check_typedef on our type to make sure that, if TYPE is
+ a TYPE_CODE_TYPEDEF, its length is set to the length of the target type
+ instead of zero. However, we do not replace the typedef type by the
+ target type, because we want to keep the typedef in order to be able to
+ set the returned value type description correctly. */
+ check_typedef (type);
len = TYPE_LENGTH (type);
- /* FIXME drow/2003-09-06: this call to the selected frame should be
- pushed upwards to the callers. */
- if (frame == NULL)
- frame = deprecated_safe_get_selected_frame ();
+ if (symbol_read_needs_frame (var))
+ gdb_assert (frame);
switch (SYMBOL_CLASS (var))
{
case LOC_CONST:
/* Put the constant back in target format. */
+ v = allocate_value (type);
store_signed_integer (value_contents_raw (v), len,
+ gdbarch_byte_order (get_type_arch (type)),
(LONGEST) SYMBOL_VALUE (var));
VALUE_LVAL (v) = not_lval;
return v;
case LOC_LABEL:
/* Put the constant back in target format. */
+ v = allocate_value (type);
if (overlay_debugging)
{
CORE_ADDR addr
= symbol_overlayed_address (SYMBOL_VALUE_ADDRESS (var),
- SYMBOL_BFD_SECTION (var));
+ SYMBOL_OBJ_SECTION (var));
+
store_typed_address (value_contents_raw (v), type, addr);
}
else
return v;
case LOC_CONST_BYTES:
- {
- memcpy (value_contents_raw (v), SYMBOL_VALUE_BYTES (var), len);
- VALUE_LVAL (v) = not_lval;
- return v;
- }
+ v = allocate_value (type);
+ memcpy (value_contents_raw (v), SYMBOL_VALUE_BYTES (var), len);
+ VALUE_LVAL (v) = not_lval;
+ return v;
case LOC_STATIC:
+ v = allocate_value_lazy (type);
if (overlay_debugging)
addr = symbol_overlayed_address (SYMBOL_VALUE_ADDRESS (var),
- SYMBOL_BFD_SECTION (var));
+ SYMBOL_OBJ_SECTION (var));
else
addr = SYMBOL_VALUE_ADDRESS (var);
break;
- case LOC_INDIRECT:
- {
- /* The import slot does not have a real address in it from the
- dynamic loader (dld.sl on HP-UX), if the target hasn't
- begun execution yet, so check for that. */
- CORE_ADDR locaddr;
- struct value *loc;
- if (!target_has_execution)
- error (_("\
-Attempt to access variable defined in different shared object or load module when\n\
-addresses have not been bound by the dynamic loader. Try again when executable is running."));
-
- locaddr = SYMBOL_VALUE_ADDRESS (var);
- loc = value_at (lookup_pointer_type (type), locaddr);
- addr = value_as_address (loc);
- break;
- }
-
case LOC_ARG:
- if (frame == NULL)
- return 0;
addr = get_frame_args_address (frame);
if (!addr)
return 0;
addr += SYMBOL_VALUE (var);
+ v = allocate_value_lazy (type);
break;
case LOC_REF_ARG:
{
struct value *ref;
CORE_ADDR argref;
- if (frame == NULL)
- return 0;
+
argref = get_frame_args_address (frame);
if (!argref)
return 0;
argref += SYMBOL_VALUE (var);
ref = value_at (lookup_pointer_type (type), argref);
addr = value_as_address (ref);
+ v = allocate_value_lazy (type);
break;
}
case LOC_LOCAL:
- case LOC_LOCAL_ARG:
- if (frame == NULL)
- return 0;
addr = get_frame_locals_address (frame);
addr += SYMBOL_VALUE (var);
+ v = allocate_value_lazy (type);
break;
- case LOC_BASEREG:
- case LOC_BASEREG_ARG:
- case LOC_HP_THREAD_LOCAL_STATIC:
- {
- struct value *regval;
-
- regval = value_from_register (lookup_pointer_type (type),
- SYMBOL_BASEREG (var), frame);
- if (regval == NULL)
- error (_("Value of base register not available."));
- addr = value_as_address (regval);
- addr += SYMBOL_VALUE (var);
- break;
- }
-
case LOC_TYPEDEF:
error (_("Cannot look up value of a typedef"));
break;
case LOC_BLOCK:
+ v = allocate_value_lazy (type);
if (overlay_debugging)
- VALUE_ADDRESS (v) = symbol_overlayed_address
- (BLOCK_START (SYMBOL_BLOCK_VALUE (var)), SYMBOL_BFD_SECTION (var));
+ addr = symbol_overlayed_address
+ (BLOCK_START (SYMBOL_BLOCK_VALUE (var)), SYMBOL_OBJ_SECTION (var));
else
- VALUE_ADDRESS (v) = BLOCK_START (SYMBOL_BLOCK_VALUE (var));
- return v;
+ addr = BLOCK_START (SYMBOL_BLOCK_VALUE (var));
+ break;
case LOC_REGISTER:
- case LOC_REGPARM:
case LOC_REGPARM_ADDR:
{
- struct block *b;
- int regno = SYMBOL_VALUE (var);
+ int regno = SYMBOL_REGISTER_OPS (var)
+ ->register_number (var, get_frame_arch (frame));
struct value *regval;
- if (frame == NULL)
- return 0;
- b = get_frame_block (frame, 0);
-
if (SYMBOL_CLASS (var) == LOC_REGPARM_ADDR)
{
regval = value_from_register (lookup_pointer_type (type),
error (_("Value of register variable not available."));
addr = value_as_address (regval);
- VALUE_LVAL (v) = lval_memory;
+ v = allocate_value_lazy (type);
}
else
{
break;
case LOC_COMPUTED:
- case LOC_COMPUTED_ARG:
/* FIXME: cagney/2004-01-26: It should be possible to
- unconditionally call the SYMBOL_OPS method when available.
+ unconditionally call the SYMBOL_COMPUTED_OPS method when available.
Unfortunately DWARF 2 stores the frame-base (instead of the
function) location in a function's symbol. Oops! For the
moment enable this when/where applicable. */
- if (frame == 0 && SYMBOL_OPS (var)->read_needs_frame (var))
- return 0;
- return SYMBOL_OPS (var)->read_variable (var, frame);
+ return SYMBOL_COMPUTED_OPS (var)->read_variable (var, frame);
case LOC_UNRESOLVED:
{
struct minimal_symbol *msym;
+ struct obj_section *obj_section;
- msym = lookup_minimal_symbol (DEPRECATED_SYMBOL_NAME (var), NULL, NULL);
+ msym = lookup_minimal_symbol (SYMBOL_LINKAGE_NAME (var), NULL, NULL);
if (msym == NULL)
return 0;
if (overlay_debugging)
addr = symbol_overlayed_address (SYMBOL_VALUE_ADDRESS (msym),
- SYMBOL_BFD_SECTION (msym));
+ SYMBOL_OBJ_SECTION (msym));
else
addr = SYMBOL_VALUE_ADDRESS (msym);
+
+ obj_section = SYMBOL_OBJ_SECTION (msym);
+ if (obj_section
+ && (obj_section->the_bfd_section->flags & SEC_THREAD_LOCAL) != 0)
+ addr = target_translate_tls_address (obj_section->objfile, addr);
+ v = allocate_value_lazy (type);
}
break;
case LOC_OPTIMIZED_OUT:
+ v = allocate_value_lazy (type);
VALUE_LVAL (v) = not_lval;
set_value_optimized_out (v, 1);
return v;
break;
}
- VALUE_ADDRESS (v) = addr;
- set_value_lazy (v, 1);
+ VALUE_LVAL (v) = lval_memory;
+ set_value_address (v, addr);
return v;
}
an integral number of registers. Otherwise, you need to do
some fiddling with the last register copied here for little
endian machines. */
- if (gdbarch_byte_order (current_gdbarch) == BFD_ENDIAN_BIG
+ if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG
&& len < register_size (gdbarch, regnum))
/* Big-endian, and we want less than full size. */
set_value_offset (value, register_size (gdbarch, regnum) - len);
struct type *type1 = check_typedef (type);
struct value *v;
- if (CONVERT_REGISTER_P (regnum, type1))
+ if (gdbarch_convert_register_p (gdbarch, regnum, type1))
{
/* The ISA/ABI need to something weird when obtaining the
specified value from this register. It might need to
re-order non-adjacent, starting with REGNUM (see MIPS and
i386). It might need to convert the [float] register into
the corresponding [integer] type (see Alpha). The assumption
- is that REGISTER_TO_VALUE populates the entire value
+ is that gdbarch_register_to_value populates the entire value
including the location. */
v = allocate_value (type);
VALUE_LVAL (v) = lval_register;
VALUE_FRAME_ID (v) = get_frame_id (frame);
VALUE_REGNUM (v) = regnum;
- REGISTER_TO_VALUE (frame, regnum, type1, value_contents_raw (v));
+ gdbarch_register_to_value (gdbarch,
+ frame, regnum, type1, value_contents_raw (v));
}
else
{
return result;
}
-
-\f
-/* Given a struct symbol for a variable or function,
- and a stack frame id,
- return a (pointer to a) struct value containing the properly typed
- address. */
-
-struct value *
-locate_var_value (struct symbol *var, struct frame_info *frame)
-{
- CORE_ADDR addr = 0;
- struct type *type = SYMBOL_TYPE (var);
- struct value *lazy_value;
-
- /* Evaluate it first; if the result is a memory address, we're fine.
- Lazy evaluation pays off here. */
-
- lazy_value = read_var_value (var, frame);
- if (lazy_value == 0)
- error (_("Address of \"%s\" is unknown."), SYMBOL_PRINT_NAME (var));
-
- if (value_lazy (lazy_value)
- || TYPE_CODE (type) == TYPE_CODE_FUNC)
- {
- struct value *val;
-
- addr = VALUE_ADDRESS (lazy_value);
- val = value_from_pointer (lookup_pointer_type (type), addr);
- return val;
- }
-
- /* Not a memory address; check what the problem was. */
- switch (VALUE_LVAL (lazy_value))
- {
- case lval_register:
- gdb_assert (gdbarch_register_name
- (current_gdbarch, VALUE_REGNUM (lazy_value)) != NULL
- && *gdbarch_register_name
- (current_gdbarch, VALUE_REGNUM (lazy_value)) != '\0');
- error (_("Address requested for identifier "
- "\"%s\" which is in register $%s"),
- SYMBOL_PRINT_NAME (var),
- gdbarch_register_name (current_gdbarch, VALUE_REGNUM (lazy_value)));
- break;
-
- default:
- error (_("Can't take address of \"%s\" which isn't an lvalue."),
- SYMBOL_PRINT_NAME (var));
- break;
- }
- return 0; /* For lint -- never reached */
-}
projects / deliverable / binutils-gdb.git / blobdiff