/* Find a variable's value in memory, for GDB, the GNU debugger.
- Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
- 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2003 Free Software
+ Copyright (C) 1986-2001, 2003-2005, 2007-2012 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., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "symtab.h"
#include "floatformat.h"
#include "symfile.h" /* for overlay functions */
#include "regcache.h"
-#include "builtin-regs.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 void *addr, int len)
+extract_signed_integer (const gdb_byte *addr, int len,
+ enum bfd_endian byte_order)
{
LONGEST retval;
const unsigned char *p;
const unsigned char *endaddr = startaddr + len;
if (len > (int) sizeof (LONGEST))
- error ("\
-That operation is not available on integers of more than %d bytes.",
+ error (_("\
+That operation is not available on integers of more than %d bytes."),
(int) sizeof (LONGEST));
/* Start at the most significant end of the integer, and work towards
the least significant. */
- if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG)
+ if (byte_order == BFD_ENDIAN_BIG)
{
p = startaddr;
/* Do the sign extension once at the start. */
}
ULONGEST
-extract_unsigned_integer (const void *addr, int len)
+extract_unsigned_integer (const gdb_byte *addr, int len,
+ enum bfd_endian byte_order)
{
ULONGEST retval;
const unsigned char *p;
const unsigned char *endaddr = startaddr + len;
if (len > (int) sizeof (ULONGEST))
- error ("\
-That operation is not available on integers of more than %d bytes.",
+ error (_("\
+That operation is not available on integers of more than %d bytes."),
(int) sizeof (ULONGEST));
/* Start at the most significant end of the integer, and work towards
the least significant. */
retval = 0;
- if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG)
+ if (byte_order == BFD_ENDIAN_BIG)
{
for (p = startaddr; p < endaddr; ++p)
retval = (retval << 8) | *p;
function returns 1 and sets *PVAL. Otherwise it returns 0. */
int
-extract_long_unsigned_integer (const void *addr, int orig_len, LONGEST *pval)
+extract_long_unsigned_integer (const gdb_byte *addr, int orig_len,
+ enum bfd_endian byte_order, LONGEST *pval)
{
- char *p, *first_addr;
+ const gdb_byte *p;
+ const gdb_byte *first_addr;
int len;
len = orig_len;
- if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG)
+ if (byte_order == BFD_ENDIAN_BIG)
{
- for (p = (char *) addr;
- len > (int) sizeof (LONGEST) && p < (char *) addr + orig_len;
+ for (p = addr;
+ len > (int) sizeof (LONGEST) && p < addr + orig_len;
p++)
{
if (*p == 0)
}
else
{
- first_addr = (char *) addr;
- for (p = (char *) addr + orig_len - 1;
- len > (int) sizeof (LONGEST) && p >= (char *) addr;
+ first_addr = addr;
+ for (p = addr + orig_len - 1;
+ len > (int) sizeof (LONGEST) && p >= addr;
p--)
{
if (*p == 0)
if (len <= (int) sizeof (LONGEST))
{
*pval = (LONGEST) extract_unsigned_integer (first_addr,
- sizeof (LONGEST));
+ sizeof (LONGEST),
+ byte_order);
return 1;
}
}
-/* Treat the LEN bytes at ADDR as a target-format address, and return
- that address. ADDR is a buffer in the GDB process, not in the
- inferior.
-
- This function should only be used by target-specific code. It
- assumes that a pointer has the same representation as that thing's
- address represented as an integer. Some machines use word
- addresses, or similarly munged things, for certain types of
- pointers, so that assumption doesn't hold everywhere.
-
- Common code should use extract_typed_address instead, or something
- else based on POINTER_TO_ADDRESS. */
-
-CORE_ADDR
-extract_address (const void *addr, int len)
-{
- /* Assume a CORE_ADDR can fit in a LONGEST (for now). Not sure
- whether we want this to be true eventually. */
- return (CORE_ADDR) extract_unsigned_integer (addr, len);
-}
-
-
/* Treat the bytes at BUF as a pointer of type TYPE, and return the
address it represents. */
CORE_ADDR
-extract_typed_address (const void *buf, struct type *type)
+extract_typed_address (const gdb_byte *buf, struct type *type)
{
if (TYPE_CODE (type) != TYPE_CODE_PTR
&& TYPE_CODE (type) != TYPE_CODE_REF)
internal_error (__FILE__, __LINE__,
- "extract_typed_address: "
- "type is not a pointer or reference");
+ _("extract_typed_address: "
+ "type is not a pointer or reference"));
- return POINTER_TO_ADDRESS (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 (void *addr, int len, LONGEST val)
+store_signed_integer (gdb_byte *addr, int len,
+ enum bfd_endian byte_order, LONGEST val)
{
- unsigned char *p;
- unsigned char *startaddr = (unsigned char *) addr;
- unsigned char *endaddr = startaddr + len;
+ gdb_byte *p;
+ gdb_byte *startaddr = addr;
+ gdb_byte *endaddr = startaddr + len;
/* Start at the least significant end of the integer, and work towards
the most significant. */
- if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG)
+ if (byte_order == BFD_ENDIAN_BIG)
{
for (p = endaddr - 1; p >= startaddr; --p)
{
}
void
-store_unsigned_integer (void *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 (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG)
+ if (byte_order == BFD_ENDIAN_BIG)
{
for (p = endaddr - 1; p >= startaddr; --p)
{
}
}
-/* Store the address VAL as a LEN-byte value in target byte order at
- ADDR. ADDR is a buffer in the GDB process, not in the inferior.
-
- This function should only be used by target-specific code. It
- assumes that a pointer has the same representation as that thing's
- address represented as an integer. Some machines use word
- addresses, or similarly munged things, for certain types of
- pointers, so that assumption doesn't hold everywhere.
-
- Common code should use store_typed_address instead, or something else
- based on ADDRESS_TO_POINTER. */
-void
-store_address (void *addr, int len, LONGEST val)
-{
- store_unsigned_integer (addr, len, val);
-}
-
-
/* Store the address ADDR as a pointer of type TYPE at BUF, in target
form. */
void
-store_typed_address (void *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
&& TYPE_CODE (type) != TYPE_CODE_REF)
internal_error (__FILE__, __LINE__,
- "store_typed_address: "
- "type is not a pointer or reference");
+ _("store_typed_address: "
+ "type is not a pointer or reference"));
- ADDRESS_TO_POINTER (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
REGNUM as found in the specified FRAME. The register's type is
- determined by register_type().
-
- NOTE: returns NULL if register value is not available. Caller will
- check return value or die! */
+ determined by register_type(). */
struct value *
value_of_register (int regnum, struct frame_info *frame)
{
+ struct gdbarch *gdbarch = get_frame_arch (frame);
CORE_ADDR addr;
int optim;
+ int unavail;
struct value *reg_val;
int realnum;
- char raw_buffer[MAX_REGISTER_SIZE];
+ gdb_byte raw_buffer[MAX_REGISTER_SIZE];
enum lval_type lval;
- /* Builtin registers lie completly 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. */
- if (regnum >= NUM_REGS + NUM_PSEUDO_REGS)
- return value_of_builtin_reg (regnum, frame);
+ 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);
+ frame_register (frame, regnum, &optim, &unavail,
+ &lval, &addr, &realnum, raw_buffer);
- /* FIXME: cagney/2002-05-15: This test is just bogus.
+ reg_val = allocate_value (register_type (gdbarch, regnum));
- It indicates that the target failed to supply a value for a
- register because it was "not available" at this time. Problem
- is, the target still has the register and so get saved_register()
- may be returning a value saved on the stack. */
+ if (!optim && !unavail)
+ memcpy (value_contents_raw (reg_val), raw_buffer,
+ register_size (gdbarch, regnum));
+ else
+ memset (value_contents_raw (reg_val), 0,
+ register_size (gdbarch, regnum));
- if (register_cached (regnum) < 0)
- return NULL; /* register value not available */
+ VALUE_LVAL (reg_val) = lval;
+ set_value_address (reg_val, addr);
+ VALUE_REGNUM (reg_val) = regnum;
+ set_value_optimized_out (reg_val, optim);
+ if (unavail)
+ mark_value_bytes_unavailable (reg_val, 0, register_size (gdbarch, regnum));
+ VALUE_FRAME_ID (reg_val) = get_frame_id (frame);
+ return reg_val;
+}
- reg_val = allocate_value (register_type (current_gdbarch, regnum));
+/* 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. */
- /* Convert raw data to virtual format if necessary. */
+struct value *
+value_of_register_lazy (struct frame_info *frame, int regnum)
+{
+ struct gdbarch *gdbarch = get_frame_arch (frame);
+ struct value *reg_val;
- if (REGISTER_CONVERTIBLE (regnum))
- {
- REGISTER_CONVERT_TO_VIRTUAL (regnum, register_type (current_gdbarch, regnum),
- raw_buffer, VALUE_CONTENTS_RAW (reg_val));
- }
- else if (REGISTER_RAW_SIZE (regnum) == REGISTER_VIRTUAL_SIZE (regnum))
- memcpy (VALUE_CONTENTS_RAW (reg_val), raw_buffer,
- REGISTER_RAW_SIZE (regnum));
- else
- internal_error (__FILE__, __LINE__,
- "Register \"%s\" (%d) has conflicting raw (%d) and virtual (%d) size",
- REGISTER_NAME (regnum),
- regnum,
- REGISTER_RAW_SIZE (regnum),
- REGISTER_VIRTUAL_SIZE (regnum));
- VALUE_LVAL (reg_val) = lval;
- VALUE_ADDRESS (reg_val) = addr;
- VALUE_REGNO (reg_val) = regnum;
- VALUE_OPTIMIZED_OUT (reg_val) = optim;
+ 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 void *buf)
+unsigned_pointer_to_address (struct gdbarch *gdbarch,
+ struct type *type, const gdb_byte *buf)
{
- return extract_address (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 void *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, void *buf, CORE_ADDR addr)
+unsigned_address_to_pointer (struct gdbarch *gdbarch, struct type *type,
+ gdb_byte *buf, CORE_ADDR addr)
{
- store_address (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, void *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:
- {
- struct location_funcs *symfuncs = SYMBOL_LOCATION_FUNCS (sym);
- return (symfuncs->read_needs_frame) (sym);
- }
- break;
+ /* FIXME: cagney/2004-01-26: It should be possible to
+ 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_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 deprecated_selected_frame. */
+ and return a (pointer to a) struct value containing the value.
+ If the variable cannot be found, throw error. */
struct value *
-read_var_value (register struct symbol *var, struct frame_info *frame)
+read_var_value (struct symbol *var, struct frame_info *frame)
{
- register struct value *v;
+ struct value *v;
struct type *type = SYMBOL_TYPE (var);
CORE_ADDR addr;
- register int len;
+ int len;
- v = allocate_value (type);
- VALUE_LVAL (v) = lval_memory; /* The most likely possibility. */
- VALUE_BFD_SECTION (v) = SYMBOL_BFD_SECTION (var);
+ /* 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);
- if (frame == NULL)
- frame = deprecated_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. */
- store_signed_integer (VALUE_CONTENTS_RAW (v), len,
+ 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));
- store_typed_address (VALUE_CONTENTS_RAW (v), type, addr);
+ SYMBOL_OBJ_SECTION (var));
+
+ store_typed_address (value_contents_raw (v), type, addr);
}
else
- store_typed_address (VALUE_CONTENTS_RAW (v), type,
+ store_typed_address (value_contents_raw (v), type,
SYMBOL_VALUE_ADDRESS (var));
VALUE_LVAL (v) = not_lval;
return v;
case LOC_CONST_BYTES:
- {
- char *bytes_addr;
- bytes_addr = SYMBOL_VALUE_BYTES (var);
- memcpy (VALUE_CONTENTS_RAW (v), bytes_addr, 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, NULL);
- addr = value_as_address (loc);
- }
-
case LOC_ARG:
- if (frame == NULL)
- return 0;
addr = get_frame_args_address (frame);
if (!addr)
- return 0;
+ error (_("Unknown argument list address for `%s'."),
+ SYMBOL_PRINT_NAME (var));
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;
+ error (_("Unknown argument list address for `%s'."),
+ SYMBOL_PRINT_NAME (var));
argref += SYMBOL_VALUE (var);
- ref = value_at (lookup_pointer_type (type), argref, NULL);
+ 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_THREAD_LOCAL_STATIC:
- {
- if (target_get_thread_local_address_p ())
- addr = target_get_thread_local_address (inferior_ptid,
- SYMBOL_OBJFILE (var),
- SYMBOL_VALUE_ADDRESS (var));
- /* It wouldn't be wrong here to try a gdbarch method, too;
- finding TLS is an ABI-specific thing. But we don't do that
- yet. */
- else
- error ("Cannot find thread-local variables on this target");
- break;
- }
-
case LOC_TYPEDEF:
- error ("Cannot look up value of a typedef");
+ error (_("Cannot look up value of a typedef `%s'."),
+ SYMBOL_PRINT_NAME (var));
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),
frame);
if (regval == NULL)
- error ("Value of register variable not available.");
+ error (_("Value of register variable not available for `%s'."),
+ SYMBOL_PRINT_NAME (var));
addr = value_as_address (regval);
- VALUE_LVAL (v) = lval_memory;
+ v = allocate_value_lazy (type);
}
else
{
regval = value_from_register (type, regno, frame);
if (regval == NULL)
- error ("Value of register variable not available.");
+ error (_("Value of register variable not available for `%s'."),
+ SYMBOL_PRINT_NAME (var));
return regval;
}
}
break;
case LOC_COMPUTED:
- case LOC_COMPUTED_ARG:
- {
- struct location_funcs *funcs = SYMBOL_LOCATION_FUNCS (var);
-
- if (frame == 0 && (funcs->read_needs_frame) (var))
- return 0;
- return (funcs->read_variable) (var, frame);
-
- }
- break;
+ /* FIXME: cagney/2004-01-26: It should be possible to
+ 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_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;
+ error (_("No global symbol \"%s\"."), SYMBOL_LINKAGE_NAME (var));
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:
- VALUE_LVAL (v) = not_lval;
- VALUE_OPTIMIZED_OUT (v) = 1;
- return v;
+ return allocate_optimized_out_value (type);
default:
- error ("Cannot look up value of a botched symbol.");
+ error (_("Cannot look up value of a botched symbol `%s'."),
+ SYMBOL_PRINT_NAME (var));
break;
}
- VALUE_ADDRESS (v) = addr;
- VALUE_LAZY (v) = 1;
+ VALUE_LVAL (v) = lval_memory;
+ set_value_address (v, addr);
return v;
}
-/* Return a value of type TYPE, stored in register REGNUM, in frame
- FRAME.
-
- NOTE: returns NULL if register value is not available.
- Caller will check return value or die! */
+/* Install default attributes for register values. */
struct value *
-value_from_register (struct type *type, int regnum, struct frame_info *frame)
+default_value_from_register (struct type *type, int regnum,
+ struct frame_info *frame)
{
- char raw_buffer[MAX_REGISTER_SIZE];
- CORE_ADDR addr;
- int optim;
- struct value *v = allocate_value (type);
- char *value_bytes = 0;
- int value_bytes_copied = 0;
- int num_storage_locs;
- enum lval_type lval;
- int len;
+ struct gdbarch *gdbarch = get_frame_arch (frame);
+ int len = TYPE_LENGTH (type);
+ struct value *value = allocate_value (type);
+
+ VALUE_LVAL (value) = lval_register;
+ VALUE_FRAME_ID (value) = get_frame_id (frame);
+ VALUE_REGNUM (value) = regnum;
+
+ /* Any structure stored in more than one register will always be
+ 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 (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);
+ else
+ set_value_offset (value, 0);
- CHECK_TYPEDEF (type);
- len = TYPE_LENGTH (type);
+ return value;
+}
- VALUE_REGNO (v) = regnum;
+/* VALUE must be an lval_register value. If regnum is the value's
+ associated register number, and len the length of the values type,
+ read one or more registers in FRAME, starting with register REGNUM,
+ until we've read LEN bytes. */
- num_storage_locs = (len > REGISTER_VIRTUAL_SIZE (regnum) ?
- ((len - 1) / REGISTER_RAW_SIZE (regnum)) + 1 :
- 1);
+void
+read_frame_register_value (struct value *value, struct frame_info *frame)
+{
+ struct gdbarch *gdbarch = get_frame_arch (frame);
+ int offset = 0;
+ int reg_offset = value_offset (value);
+ int regnum = VALUE_REGNUM (value);
+ int len = TYPE_LENGTH (check_typedef (value_type (value)));
- if (num_storage_locs > 1
-#if 0
- // OBSOLETE #ifdef GDB_TARGET_IS_H8500
- // OBSOLETE || TYPE_CODE (type) == TYPE_CODE_PTR
- // OBSOLETE #endif
-#endif
- )
- {
- /* Value spread across multiple storage locations. */
-
- int local_regnum;
- int mem_stor = 0, reg_stor = 0;
- int mem_tracking = 1;
- CORE_ADDR last_addr = 0;
- CORE_ADDR first_addr = 0;
-
- value_bytes = (char *) alloca (len + MAX_REGISTER_SIZE);
-
- /* Copy all of the data out, whereever it may be. */
-
-#if 0
- // OBSOLETE #ifdef GDB_TARGET_IS_H8500
- // OBSOLETE /* This piece of hideosity is required because the H8500 treats registers
- // OBSOLETE differently depending upon whether they are used as pointers or not. As a
- // OBSOLETE pointer, a register needs to have a page register tacked onto the front.
- // OBSOLETE An alternate way to do this would be to have gcc output different register
- // OBSOLETE numbers for the pointer & non-pointer form of the register. But, it
- // OBSOLETE doesn't, so we're stuck with this. */
- // OBSOLETE
- // OBSOLETE if (TYPE_CODE (type) == TYPE_CODE_PTR
- // OBSOLETE && len > 2)
- // OBSOLETE {
- // OBSOLETE int page_regnum;
- // OBSOLETE
- // OBSOLETE switch (regnum)
- // OBSOLETE {
- // OBSOLETE case R0_REGNUM:
- // OBSOLETE case R1_REGNUM:
- // OBSOLETE case R2_REGNUM:
- // OBSOLETE case R3_REGNUM:
- // OBSOLETE page_regnum = SEG_D_REGNUM;
- // OBSOLETE break;
- // OBSOLETE case R4_REGNUM:
- // OBSOLETE case R5_REGNUM:
- // OBSOLETE page_regnum = SEG_E_REGNUM;
- // OBSOLETE break;
- // OBSOLETE case R6_REGNUM:
- // OBSOLETE case R7_REGNUM:
- // OBSOLETE page_regnum = SEG_T_REGNUM;
- // OBSOLETE break;
- // OBSOLETE }
- // OBSOLETE
- // OBSOLETE value_bytes[0] = 0;
- // OBSOLETE get_saved_register (value_bytes + 1,
- // OBSOLETE &optim,
- // OBSOLETE &addr,
- // OBSOLETE frame,
- // OBSOLETE page_regnum,
- // OBSOLETE &lval);
- // OBSOLETE
- // OBSOLETE if (register_cached (page_regnum) == -1)
- // OBSOLETE return NULL; /* register value not available */
- // OBSOLETE
- // OBSOLETE if (lval == lval_register)
- // OBSOLETE reg_stor++;
- // OBSOLETE else
- // OBSOLETE mem_stor++;
- // OBSOLETE first_addr = addr;
- // OBSOLETE last_addr = addr;
- // OBSOLETE
- // OBSOLETE get_saved_register (value_bytes + 2,
- // OBSOLETE &optim,
- // OBSOLETE &addr,
- // OBSOLETE frame,
- // OBSOLETE regnum,
- // OBSOLETE &lval);
- // OBSOLETE
- // OBSOLETE if (register_cached (regnum) == -1)
- // OBSOLETE return NULL; /* register value not available */
- // OBSOLETE
- // OBSOLETE if (lval == lval_register)
- // OBSOLETE reg_stor++;
- // OBSOLETE else
- // OBSOLETE {
- // OBSOLETE mem_stor++;
- // OBSOLETE mem_tracking = mem_tracking && (addr == last_addr);
- // OBSOLETE }
- // OBSOLETE last_addr = addr;
- // OBSOLETE }
- // OBSOLETE else
- // OBSOLETE #endif /* GDB_TARGET_IS_H8500 */
-#endif
- for (local_regnum = regnum;
- value_bytes_copied < len;
- (value_bytes_copied += REGISTER_RAW_SIZE (local_regnum),
- ++local_regnum))
- {
- int realnum;
- frame_register (frame, local_regnum, &optim, &lval, &addr,
- &realnum, value_bytes + value_bytes_copied);
-
- if (register_cached (local_regnum) == -1)
- return NULL; /* register value not available */
-
- if (regnum == local_regnum)
- first_addr = addr;
- if (lval == lval_register)
- reg_stor++;
- else
- {
- mem_stor++;
-
- mem_tracking =
- (mem_tracking
- && (regnum == local_regnum
- || addr == last_addr));
- }
- last_addr = addr;
- }
+ gdb_assert (VALUE_LVAL (value) == lval_register);
- if ((reg_stor && mem_stor)
- || (mem_stor && !mem_tracking))
- /* Mixed storage; all of the hassle we just went through was
- for some good purpose. */
- {
- VALUE_LVAL (v) = lval_reg_frame_relative;
- VALUE_FRAME (v) = get_frame_base (frame);
- VALUE_FRAME_REGNUM (v) = regnum;
- }
- else if (mem_stor)
- {
- VALUE_LVAL (v) = lval_memory;
- VALUE_ADDRESS (v) = first_addr;
- }
- else if (reg_stor)
- {
- VALUE_LVAL (v) = lval_register;
- VALUE_ADDRESS (v) = first_addr;
- }
- else
- internal_error (__FILE__, __LINE__,
- "value_from_register: Value not stored anywhere!");
+ /* Skip registers wholly inside of REG_OFFSET. */
+ while (reg_offset >= register_size (gdbarch, regnum))
+ {
+ reg_offset -= register_size (gdbarch, regnum);
+ regnum++;
+ }
- VALUE_OPTIMIZED_OUT (v) = optim;
+ /* Copy the data. */
+ while (len > 0)
+ {
+ struct value *regval = get_frame_register_value (frame, regnum);
+ int reg_len = TYPE_LENGTH (value_type (regval)) - reg_offset;
- /* Any structure stored in more than one register will always be
- an integral number of registers. Otherwise, you'd need to do
- some fiddling with the last register copied here for little
- endian machines. */
+ /* If the register length is larger than the number of bytes
+ remaining to copy, then only copy the appropriate bytes. */
+ if (reg_len > len)
+ reg_len = len;
- /* Copy into the contents section of the value. */
- memcpy (VALUE_CONTENTS_RAW (v), value_bytes, len);
+ value_contents_copy (value, offset, regval, reg_offset, reg_len);
- /* Finally do any conversion necessary when extracting this
- type from more than one register. */
-#ifdef REGISTER_CONVERT_TO_TYPE
- REGISTER_CONVERT_TO_TYPE (regnum, type, VALUE_CONTENTS_RAW (v));
-#endif
- return v;
+ offset += reg_len;
+ len -= reg_len;
+ reg_offset = 0;
+ regnum++;
}
+}
- /* Data is completely contained within a single register. Locate the
- register's contents in a real register or in core;
- read the data in raw format. */
-
- {
- int realnum;
- frame_register (frame, regnum, &optim, &lval, &addr, &realnum, raw_buffer);
- }
-
- if (register_cached (regnum) == -1)
- return NULL; /* register value not available */
-
- VALUE_OPTIMIZED_OUT (v) = optim;
- VALUE_LVAL (v) = lval;
- VALUE_ADDRESS (v) = addr;
+/* Return a value of type TYPE, stored in register REGNUM, in frame FRAME. */
- /* Convert the raw register to the corresponding data value's memory
- format, if necessary. */
+struct value *
+value_from_register (struct type *type, int regnum, struct frame_info *frame)
+{
+ struct gdbarch *gdbarch = get_frame_arch (frame);
+ struct type *type1 = check_typedef (type);
+ struct value *v;
- if (CONVERT_REGISTER_P (regnum))
+ if (gdbarch_convert_register_p (gdbarch, regnum, type1))
{
- REGISTER_TO_VALUE (regnum, type, raw_buffer, VALUE_CONTENTS_RAW (v));
+ int optim, unavail, ok;
+
+ /* 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 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;
+ ok = gdbarch_register_to_value (gdbarch, frame, regnum, type1,
+ value_contents_raw (v), &optim,
+ &unavail);
+
+ if (!ok)
+ {
+ if (optim)
+ set_value_optimized_out (v, 1);
+ if (unavail)
+ mark_value_bytes_unavailable (v, 0, TYPE_LENGTH (type));
+ }
}
else
{
- /* Raw and virtual formats are the same for this register. */
-
- if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG && len < REGISTER_RAW_SIZE (regnum))
- {
- /* Big-endian, and we want less than full size. */
- VALUE_OFFSET (v) = REGISTER_RAW_SIZE (regnum) - len;
- }
+ /* Construct the value. */
+ v = gdbarch_value_from_register (gdbarch, type, regnum, frame);
- memcpy (VALUE_CONTENTS_RAW (v), raw_buffer + VALUE_OFFSET (v), len);
+ /* Get the data. */
+ read_frame_register_value (v, frame);
}
return v;
}
-\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 (register 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;
+/* Return contents of register REGNUM in frame FRAME as address,
+ interpreted as value of type TYPE. Will abort if register
+ value is not available. */
- addr = VALUE_ADDRESS (lazy_value);
- val = value_from_pointer (lookup_pointer_type (type), addr);
- VALUE_BFD_SECTION (val) = VALUE_BFD_SECTION (lazy_value);
- return val;
- }
+CORE_ADDR
+address_from_register (struct type *type, int regnum, struct frame_info *frame)
+{
+ struct value *value;
+ CORE_ADDR result;
- /* Not a memory address; check what the problem was. */
- switch (VALUE_LVAL (lazy_value))
- {
- case lval_register:
- gdb_assert (REGISTER_NAME (VALUE_REGNO (lazy_value)) != NULL
- && *REGISTER_NAME (VALUE_REGNO (lazy_value)) != '\0');
- error("Address requested for identifier "
- "\"%s\" which is in register $%s",
- SYMBOL_PRINT_NAME (var),
- REGISTER_NAME (VALUE_REGNO (lazy_value)));
- break;
+ value = value_from_register (type, regnum, frame);
+ gdb_assert (value);
- case lval_reg_frame_relative:
- gdb_assert (REGISTER_NAME (VALUE_FRAME_REGNUM (lazy_value)) != NULL
- && *REGISTER_NAME (VALUE_FRAME_REGNUM (lazy_value)) != '\0');
- error("Address requested for identifier "
- "\"%s\" which is in frame register $%s",
- SYMBOL_PRINT_NAME (var),
- REGISTER_NAME (VALUE_FRAME_REGNUM (lazy_value)));
- break;
+ result = value_as_address (value);
+ release_value (value);
+ value_free (value);
- default:
- error ("Can't take address of \"%s\" which isn't an lvalue.",
- SYMBOL_PRINT_NAME (var));
- break;
- }
- return 0; /* For lint -- never reached */
+ return result;
}
+
projects / external / binutils.git / blobdiff