/* Find a variable's value in memory, for GDB, the GNU debugger.
- Copyright 1986, 87, 89, 91, 94, 95, 96, 1998
- Free Software Foundation, Inc.
+
+ Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
+ 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2004, 2005 Free
+ Software Foundation, Inc.
This file is part of GDB.
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. */
+ Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301, USA. */
#include "defs.h"
#include "symtab.h"
#include "inferior.h"
#include "target.h"
#include "gdb_string.h"
+#include "gdb_assert.h"
#include "floatformat.h"
#include "symfile.h" /* for overlay functions */
-
-/* This is used to indicate that we don't know the format of the floating point
- number. Typically, this is useful for native ports, where the actual format
- is irrelevant, since no conversions will be taking place. */
-
-const struct floatformat floatformat_unknown;
+#include "regcache.h"
+#include "user-regs.h"
+#include "block.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. */
#endif
LONGEST
-extract_signed_integer (void *addr, int len)
+extract_signed_integer (const gdb_byte *addr, int len)
{
LONGEST retval;
- unsigned char *p;
- unsigned char *startaddr = (unsigned char *) addr;
- unsigned char *endaddr = startaddr + len;
+ const unsigned char *p;
+ const unsigned char *startaddr = addr;
+ const unsigned char *endaddr = startaddr + len;
if (len > (int) sizeof (LONGEST))
- error ("\
-That operation is not available on integers of more than %d bytes.",
- sizeof (LONGEST));
+ 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 == BIG_ENDIAN)
+ if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG)
{
p = startaddr;
/* Do the sign extension once at the start. */
}
ULONGEST
-extract_unsigned_integer (void *addr, int len)
+extract_unsigned_integer (const gdb_byte *addr, int len)
{
ULONGEST retval;
- unsigned char *p;
- unsigned char *startaddr = (unsigned char *) addr;
- unsigned char *endaddr = startaddr + len;
+ const unsigned char *p;
+ const unsigned char *startaddr = addr;
+ const unsigned char *endaddr = startaddr + len;
if (len > (int) sizeof (ULONGEST))
- error ("\
-That operation is not available on integers of more than %d bytes.",
- sizeof (ULONGEST));
+ 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 == BIG_ENDIAN)
+ if (TARGET_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 (void *addr, int orig_len, LONGEST *pval)
+extract_long_unsigned_integer (const gdb_byte *addr, int orig_len,
+ LONGEST *pval)
{
- char *p, *first_addr;
+ const gdb_byte *p;
+ const gdb_byte *first_addr;
int len;
len = orig_len;
- if (TARGET_BYTE_ORDER == BIG_ENDIAN)
+ if (TARGET_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)
}
-/* 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 (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 (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 ("findvar.c (extract_typed_address): "
- "type is not a pointer or reference");
+ internal_error (__FILE__, __LINE__,
+ _("extract_typed_address: "
+ "type is not a pointer or reference"));
return POINTER_TO_ADDRESS (type, buf);
}
void
-store_signed_integer (void *addr, int len, LONGEST val)
+store_signed_integer (gdb_byte *addr, int len, 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 == BIG_ENDIAN)
+ if (TARGET_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, 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 == BIG_ENDIAN)
+ if (TARGET_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 ("findvar.c (store_typed_address): "
- "type is not a pointer or reference");
+ internal_error (__FILE__, __LINE__,
+ _("store_typed_address: "
+ "type is not a pointer or reference"));
ADDRESS_TO_POINTER (type, buf, addr);
}
-\f
-/* Extract a floating-point number from a target-order byte-stream at ADDR.
- Returns the value as type DOUBLEST.
+/* 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().
- If the host and target formats agree, we just copy the raw data into the
- appropriate type of variable and return, letting the host increase precision
- as necessary. Otherwise, we call the conversion routine and let it do the
- dirty work. */
+ NOTE: returns NULL if register value is not available. Caller will
+ check return value or die! */
-DOUBLEST
-extract_floating (void *addr, int len)
-{
- DOUBLEST dretval;
-
- if (len * TARGET_CHAR_BIT == TARGET_FLOAT_BIT)
- {
- if (HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT)
- {
- float retval;
-
- memcpy (&retval, addr, sizeof (retval));
- return retval;
- }
- else
- floatformat_to_doublest (TARGET_FLOAT_FORMAT, addr, &dretval);
- }
- else if (len * TARGET_CHAR_BIT == TARGET_DOUBLE_BIT)
- {
- if (HOST_DOUBLE_FORMAT == TARGET_DOUBLE_FORMAT)
- {
- double retval;
-
- memcpy (&retval, addr, sizeof (retval));
- return retval;
- }
- else
- floatformat_to_doublest (TARGET_DOUBLE_FORMAT, addr, &dretval);
- }
- else if (len * TARGET_CHAR_BIT == TARGET_LONG_DOUBLE_BIT)
- {
- if (HOST_LONG_DOUBLE_FORMAT == TARGET_LONG_DOUBLE_FORMAT)
- {
- DOUBLEST retval;
-
- memcpy (&retval, addr, sizeof (retval));
- return retval;
- }
- else
- floatformat_to_doublest (TARGET_LONG_DOUBLE_FORMAT, addr, &dretval);
- }
- else
- {
- error ("Can't deal with a floating point number of %d bytes.", len);
- }
-
- return dretval;
-}
-
-void
-store_floating (void *addr, int len, DOUBLEST val)
-{
- if (len * TARGET_CHAR_BIT == TARGET_FLOAT_BIT)
- {
- if (HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT)
- {
- float floatval = val;
-
- memcpy (addr, &floatval, sizeof (floatval));
- }
- else
- floatformat_from_doublest (TARGET_FLOAT_FORMAT, &val, addr);
- }
- else if (len * TARGET_CHAR_BIT == TARGET_DOUBLE_BIT)
- {
- if (HOST_DOUBLE_FORMAT == TARGET_DOUBLE_FORMAT)
- {
- double doubleval = val;
-
- memcpy (addr, &doubleval, sizeof (doubleval));
- }
- else
- floatformat_from_doublest (TARGET_DOUBLE_FORMAT, &val, addr);
- }
- else if (len * TARGET_CHAR_BIT == TARGET_LONG_DOUBLE_BIT)
- {
- if (HOST_LONG_DOUBLE_FORMAT == TARGET_LONG_DOUBLE_FORMAT)
- memcpy (addr, &val, sizeof (val));
- else
- floatformat_from_doublest (TARGET_LONG_DOUBLE_FORMAT, &val, addr);
- }
- else
- {
- error ("Can't deal with a floating point number of %d bytes.", len);
- }
-}
-
-/* Return a `value' with the contents of register REGNUM
- in its virtual format, with the type specified by
- REGISTER_VIRTUAL_TYPE.
-
- NOTE: returns NULL if register value is not available.
- Caller will check return value or die! */
-
-value_ptr
-value_of_register (int regnum)
+struct value *
+value_of_register (int regnum, struct frame_info *frame)
{
CORE_ADDR addr;
int optim;
- register value_ptr reg_val;
- char *raw_buffer = (char*) alloca (MAX_REGISTER_RAW_SIZE);
+ struct value *reg_val;
+ int realnum;
+ gdb_byte raw_buffer[MAX_REGISTER_SIZE];
enum lval_type lval;
- get_saved_register (raw_buffer, &optim, &addr,
- selected_frame, regnum, &lval);
+ /* 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_user_reg (regnum, frame);
+
+ frame_register (frame, regnum, &optim, &lval, &addr, &realnum, raw_buffer);
+
+ /* FIXME: cagney/2002-05-15: This test is just bogus.
+
+ 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 (register_cached (regnum) < 0)
return NULL; /* register value not available */
- reg_val = allocate_value (REGISTER_VIRTUAL_TYPE (regnum));
-
- /* Convert raw data to virtual format if necessary. */
+ reg_val = allocate_value (register_type (current_gdbarch, regnum));
- if (REGISTER_CONVERTIBLE (regnum))
- {
- REGISTER_CONVERT_TO_VIRTUAL (regnum, REGISTER_VIRTUAL_TYPE (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 ("Register \"%s\" (%d) has conflicting raw (%d) and virtual (%d) size",
- REGISTER_NAME (regnum),
- regnum,
- REGISTER_RAW_SIZE (regnum),
- REGISTER_VIRTUAL_SIZE (regnum));
+ memcpy (value_contents_raw (reg_val), raw_buffer,
+ register_size (current_gdbarch, regnum));
VALUE_LVAL (reg_val) = lval;
VALUE_ADDRESS (reg_val) = addr;
- VALUE_REGNO (reg_val) = regnum;
- VALUE_OPTIMIZED_OUT (reg_val) = optim;
+ VALUE_REGNUM (reg_val) = regnum;
+ set_value_optimized_out (reg_val, optim);
+ 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, void *buf)
+unsigned_pointer_to_address (struct type *type, const gdb_byte *buf)
{
- return extract_address (buf, TYPE_LENGTH (type));
+ return extract_unsigned_integer (buf, TYPE_LENGTH (type));
}
CORE_ADDR
-signed_pointer_to_address (struct type *type, void *buf)
+signed_pointer_to_address (struct type *type, const gdb_byte *buf)
{
return extract_signed_integer (buf, TYPE_LENGTH (type));
}
/* 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 type *type, gdb_byte *buf,
+ CORE_ADDR addr)
{
- store_address (buf, TYPE_LENGTH (type), addr);
+ store_unsigned_integer (buf, TYPE_LENGTH (type), addr);
}
void
-address_to_signed_pointer (struct type *type, void *buf, CORE_ADDR addr)
+address_to_signed_pointer (struct type *type, gdb_byte *buf, CORE_ADDR addr)
{
store_signed_integer (buf, TYPE_LENGTH (type), addr);
}
{
/* 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.
+ 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);
+
case LOC_REGISTER:
case LOC_ARG:
case LOC_REF_ARG:
case LOC_LOCAL_ARG:
case LOC_BASEREG:
case LOC_BASEREG_ARG:
- case LOC_THREAD_LOCAL_STATIC:
+ case LOC_HP_THREAD_LOCAL_STATIC:
return 1;
case LOC_UNDEF:
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. */
+ If FRAME is NULL, use the deprecated_selected_frame. */
-value_ptr
-read_var_value (register struct symbol *var, struct frame_info *frame)
+struct value *
+read_var_value (struct symbol *var, struct frame_info *frame)
{
- register value_ptr 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);
+ 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. */
+ }
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 = selected_frame;
+ frame = deprecated_safe_get_selected_frame ();
switch (SYMBOL_CLASS (var))
{
case LOC_CONST:
/* Put the constant back in target format. */
- store_signed_integer (VALUE_CONTENTS_RAW (v), len,
+ store_signed_integer (value_contents_raw (v), len,
(LONGEST) SYMBOL_VALUE (var));
VALUE_LVAL (v) = not_lval;
return v;
CORE_ADDR addr
= symbol_overlayed_address (SYMBOL_VALUE_ADDRESS (var),
SYMBOL_BFD_SECTION (var));
- store_typed_address (VALUE_CONTENTS_RAW (v), type, addr);
+ 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);
+ memcpy (value_contents_raw (v), SYMBOL_VALUE_BYTES (var), len);
VALUE_LVAL (v) = not_lval;
return v;
}
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. */
- if (!target_has_execution)
- error ("\
+ {
+ /* 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.");
+addresses have not been bound by the dynamic loader. Try again when executable is running."));
- addr = SYMBOL_VALUE_ADDRESS (var);
- addr = read_memory_unsigned_integer
- (addr, TARGET_PTR_BIT / TARGET_CHAR_BIT);
- break;
+ 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 = FRAME_ARGS_ADDRESS (frame);
+ addr = get_frame_args_address (frame);
if (!addr)
return 0;
addr += SYMBOL_VALUE (var);
break;
case LOC_REF_ARG:
- if (frame == NULL)
- return 0;
- addr = FRAME_ARGS_ADDRESS (frame);
- if (!addr)
- return 0;
- addr += SYMBOL_VALUE (var);
- addr = read_memory_unsigned_integer
- (addr, TARGET_PTR_BIT / TARGET_CHAR_BIT);
- break;
+ {
+ 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);
+ break;
+ }
case LOC_LOCAL:
case LOC_LOCAL_ARG:
if (frame == NULL)
return 0;
- addr = FRAME_LOCALS_ADDRESS (frame);
+ addr = get_frame_locals_address (frame);
addr += SYMBOL_VALUE (var);
break;
case LOC_BASEREG:
case LOC_BASEREG_ARG:
+ case LOC_HP_THREAD_LOCAL_STATIC:
{
- char *buf = (char*) alloca (MAX_REGISTER_RAW_SIZE);
- get_saved_register (buf, NULL, NULL, frame, SYMBOL_BASEREG (var),
- NULL);
- addr = extract_address (buf, REGISTER_RAW_SIZE (SYMBOL_BASEREG (var)));
- addr += SYMBOL_VALUE (var);
- break;
- }
-
- case LOC_THREAD_LOCAL_STATIC:
- {
- char *buf = (char*) alloca (MAX_REGISTER_RAW_SIZE);
+ struct value *regval;
- get_saved_register (buf, NULL, NULL, frame, SYMBOL_BASEREG (var),
- NULL);
- addr = extract_address (buf, REGISTER_RAW_SIZE (SYMBOL_BASEREG (var)));
+ 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");
+ error (_("Cannot look up value of a typedef"));
break;
case LOC_BLOCK:
{
struct block *b;
int regno = SYMBOL_VALUE (var);
- value_ptr regval;
+ struct value *regval;
if (frame == NULL)
return 0;
- b = get_frame_block (frame);
+ b = get_frame_block (frame, 0);
if (SYMBOL_CLASS (var) == LOC_REGPARM_ADDR)
{
frame);
if (regval == NULL)
- error ("Value of register variable not available.");
+ error (_("Value of register variable not available."));
- addr = value_as_pointer (regval);
+ addr = value_as_address (regval);
VALUE_LVAL (v) = lval_memory;
}
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."));
return regval;
}
}
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.
+ 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);
+
case LOC_UNRESOLVED:
{
struct minimal_symbol *msym;
- msym = lookup_minimal_symbol (SYMBOL_NAME (var), NULL, NULL);
+ msym = lookup_minimal_symbol (DEPRECATED_SYMBOL_NAME (var), NULL, NULL);
if (msym == NULL)
return 0;
if (overlay_debugging)
case LOC_OPTIMIZED_OUT:
VALUE_LVAL (v) = not_lval;
- VALUE_OPTIMIZED_OUT (v) = 1;
+ set_value_optimized_out (v, 1);
return v;
default:
- error ("Cannot look up value of a botched symbol.");
+ error (_("Cannot look up value of a botched symbol."));
break;
}
VALUE_ADDRESS (v) = addr;
- VALUE_LAZY (v) = 1;
+ set_value_lazy (v, 1);
return v;
}
NOTE: returns NULL if register value is not available.
Caller will check return value or die! */
-value_ptr
+struct value *
value_from_register (struct type *type, int regnum, struct frame_info *frame)
{
- char *raw_buffer = (char*) alloca (MAX_REGISTER_RAW_SIZE);
- CORE_ADDR addr;
- int optim;
- value_ptr 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);
+ struct value *v = allocate_value (type);
CHECK_TYPEDEF (type);
- len = TYPE_LENGTH (type);
- /* Pointers on D10V are really only 16 bits,
- but we lie to gdb elsewhere... */
- if (GDB_TARGET_IS_D10V && TYPE_CODE (type) == TYPE_CODE_PTR)
- len = 2;
-
- VALUE_REGNO (v) = regnum;
-
- num_storage_locs = (len > REGISTER_VIRTUAL_SIZE (regnum) ?
- ((len - 1) / REGISTER_RAW_SIZE (regnum)) + 1 :
- 1);
-
- if (num_storage_locs > 1
-#ifdef GDB_TARGET_IS_H8500
- || TYPE_CODE (type) == TYPE_CODE_PTR
-#endif
- )
+ if (TYPE_LENGTH (type) == 0)
+ {
+ /* It doesn't matter much what we return for this: since the
+ length is zero, it could be anything. But if allowed to see
+ a zero-length type, the register-finding loop below will set
+ neither mem_stor nor reg_stor, and then report an internal
+ error.
+
+ Zero-length types can legitimately arise from declarations
+ like 'struct {}' (a GCC extension, not valid ISO C). GDB may
+ also create them when it finds bogus debugging information;
+ for example, in GCC 2.95.4 and binutils 2.11.93.0.2, the
+ STABS BINCL->EXCL compression process can create bad type
+ numbers. GDB reads these as TYPE_CODE_UNDEF types, with zero
+ length. (That bug is actually the only known way to get a
+ zero-length value allocated to a register --- which is what
+ it takes to make it here.)
+
+ We'll just attribute the value to the original register. */
+ VALUE_LVAL (v) = lval_register;
+ VALUE_ADDRESS (v) = regnum;
+ VALUE_REGNUM (v) = regnum;
+ }
+ else if (CONVERT_REGISTER_P (regnum, type))
+ {
+ /* 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
+ including the location. */
+ REGISTER_TO_VALUE (frame, regnum, type, value_contents_raw (v));
+ VALUE_LVAL (v) = lval_register;
+ VALUE_FRAME_ID (v) = get_frame_id (frame);
+ VALUE_REGNUM (v) = regnum;
+ }
+ else
{
- /* 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_RAW_SIZE);
+ int first_realnum = regnum;
+ int len = TYPE_LENGTH (type);
+ int value_bytes_copied;
+ int optimized = 0;
+ gdb_byte *value_bytes = alloca (len + MAX_REGISTER_SIZE);
/* Copy all of the data out, whereever it may be. */
-
-#ifdef GDB_TARGET_IS_H8500
-/* This piece of hideosity is required because the H8500 treats registers
- differently depending upon whether they are used as pointers or not. As a
- pointer, a register needs to have a page register tacked onto the front.
- An alternate way to do this would be to have gcc output different register
- numbers for the pointer & non-pointer form of the register. But, it
- doesn't, so we're stuck with this. */
-
- if (TYPE_CODE (type) == TYPE_CODE_PTR
- && len > 2)
+ for (local_regnum = regnum, value_bytes_copied = 0;
+ value_bytes_copied < len;
+ (value_bytes_copied += register_size (current_gdbarch, local_regnum),
+ ++local_regnum))
{
- int page_regnum;
-
- switch (regnum)
+ int realnum;
+ int optim;
+ enum lval_type lval;
+ CORE_ADDR addr;
+ frame_register (frame, local_regnum, &optim, &lval, &addr,
+ &realnum, value_bytes + value_bytes_copied);
+ optimized += optim;
+ if (register_cached (local_regnum) == -1)
+ return NULL; /* register value not available */
+
+ if (regnum == local_regnum)
{
- case R0_REGNUM:
- case R1_REGNUM:
- case R2_REGNUM:
- case R3_REGNUM:
- page_regnum = SEG_D_REGNUM;
- break;
- case R4_REGNUM:
- case R5_REGNUM:
- page_regnum = SEG_E_REGNUM;
- break;
- case R6_REGNUM:
- case R7_REGNUM:
- page_regnum = SEG_T_REGNUM;
- break;
+ first_addr = addr;
+ first_realnum = realnum;
}
-
- value_bytes[0] = 0;
- get_saved_register (value_bytes + 1,
- &optim,
- &addr,
- frame,
- page_regnum,
- &lval);
-
- if (register_cached (page_regnum) == -1)
- return NULL; /* register value not available */
-
- if (lval == lval_register)
- reg_stor++;
- else
- mem_stor++;
- first_addr = addr;
- last_addr = addr;
-
- get_saved_register (value_bytes + 2,
- &optim,
- &addr,
- frame,
- regnum,
- &lval);
-
- if (register_cached (regnum) == -1)
- return NULL; /* register value not available */
-
if (lval == lval_register)
reg_stor++;
else
{
mem_stor++;
- mem_tracking = mem_tracking && (addr == last_addr);
+
+ /* FIXME: cagney/2004-11-12: I think this is trying to
+ check that the stored registers are adjacent in
+ memory. It isn't doing a good job? */
+ mem_tracking = (mem_tracking
+ && (regnum == local_regnum
+ || addr == last_addr));
}
last_addr = addr;
}
- else
-#endif /* GDB_TARGET_IS_H8500 */
- for (local_regnum = regnum;
- value_bytes_copied < len;
- (value_bytes_copied += REGISTER_RAW_SIZE (local_regnum),
- ++local_regnum))
- {
- get_saved_register (value_bytes + value_bytes_copied,
- &optim,
- &addr,
- frame,
- local_regnum,
- &lval);
-
- 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;
- }
-
- 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) = FRAME_FP (frame);
- VALUE_FRAME_REGNUM (v) = regnum;
- }
- else if (mem_stor)
+
+ if (mem_tracking && mem_stor && !reg_stor)
{
VALUE_LVAL (v) = lval_memory;
VALUE_ADDRESS (v) = first_addr;
}
- else if (reg_stor)
+ else
{
VALUE_LVAL (v) = lval_register;
- VALUE_ADDRESS (v) = first_addr;
+ VALUE_FRAME_ID (v) = get_frame_id (frame);
+ VALUE_REGNUM (v) = regnum;
}
- else
- internal_error ("value_from_register: Value not stored anywhere!");
-
- VALUE_OPTIMIZED_OUT (v) = optim;
-
+
+ set_value_optimized_out (v, optimized);
+
/* Any structure stored in more than one register will always be
- an integral number of registers. Otherwise, you'd need to do
+ an integral number of registers. Otherwise, you need to do
some fiddling with the last register copied here for little
endian machines. */
-
- /* Copy into the contents section of the value. */
- memcpy (VALUE_CONTENTS_RAW (v), value_bytes, 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;
- }
-
- /* 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. */
-
- get_saved_register (raw_buffer, &optim, &addr, frame, regnum, &lval);
-
- if (register_cached (regnum) == -1)
- return NULL; /* register value not available */
-
- VALUE_OPTIMIZED_OUT (v) = optim;
- VALUE_LVAL (v) = lval;
- VALUE_ADDRESS (v) = addr;
-
- /* Convert raw data to virtual format if necessary. */
-
- if (REGISTER_CONVERTIBLE (regnum))
- {
- REGISTER_CONVERT_TO_VIRTUAL (regnum, type,
- raw_buffer, VALUE_CONTENTS_RAW (v));
- }
- else
- {
- /* Raw and virtual formats are the same for this register. */
-
- if (TARGET_BYTE_ORDER == BIG_ENDIAN && len < REGISTER_RAW_SIZE (regnum))
- {
- /* Big-endian, and we want less than full size. */
- VALUE_OFFSET (v) = REGISTER_RAW_SIZE (regnum) - len;
- }
-
- memcpy (VALUE_CONTENTS_RAW (v), raw_buffer + VALUE_OFFSET (v), len);
- }
-
- if (GDB_TARGET_IS_D10V
- && TYPE_CODE (type) == TYPE_CODE_PTR)
- {
- unsigned long num;
- unsigned short snum;
-
- snum = (unsigned short)
- extract_unsigned_integer (VALUE_CONTENTS_RAW (v), 2);
-
- if (TYPE_TARGET_TYPE (type) /* pointer to function */
- && (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_FUNC))
- num = D10V_MAKE_IADDR (snum);
- else /* pointer to data */
- num = D10V_MAKE_DADDR (snum);
-
- store_address (VALUE_CONTENTS_RAW (v), 4, num);
+ if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG
+ && len < register_size (current_gdbarch, regnum))
+ /* Big-endian, and we want less than full size. */
+ set_value_offset (v, register_size (current_gdbarch, regnum) - len);
+ else
+ set_value_offset (v, 0);
+ memcpy (value_contents_raw (v), value_bytes + value_offset (v), len);
}
-
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. */
-value_ptr
-locate_var_value (register struct symbol *var, struct frame_info *frame)
+struct value *
+locate_var_value (struct symbol *var, struct frame_info *frame)
{
CORE_ADDR addr = 0;
struct type *type = SYMBOL_TYPE (var);
- value_ptr lazy_value;
+ 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_SOURCE_NAME (var));
+ error (_("Address of \"%s\" is unknown."), SYMBOL_PRINT_NAME (var));
- if (VALUE_LAZY (lazy_value)
+ if (value_lazy (lazy_value)
|| TYPE_CODE (type) == TYPE_CODE_FUNC)
{
- value_ptr val;
+ struct value *val;
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;
}
switch (VALUE_LVAL (lazy_value))
{
case lval_register:
- case lval_reg_frame_relative:
- error ("Address requested for identifier \"%s\" which is in a register.",
- SYMBOL_SOURCE_NAME (var));
+ gdb_assert (REGISTER_NAME (VALUE_REGNUM (lazy_value)) != NULL
+ && *REGISTER_NAME (VALUE_REGNUM (lazy_value)) != '\0');
+ error (_("Address requested for identifier "
+ "\"%s\" which is in register $%s"),
+ SYMBOL_PRINT_NAME (var),
+ REGISTER_NAME (VALUE_REGNUM (lazy_value)));
break;
default:
- error ("Can't take address of \"%s\" which isn't an lvalue.",
- SYMBOL_SOURCE_NAME (var));
+ error (_("Can't take address of \"%s\" which isn't an lvalue."),
+ SYMBOL_PRINT_NAME (var));
break;
}
return 0; /* For lint -- never reached */