/* Low level packing and unpacking of values for GDB, the GNU Debugger.
+
Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
- 1995, 1996, 1997, 1998, 1999, 2000, 2002.
- Free Software Foundation, Inc.
+ 1995, 1996, 1997, 1998, 1999, 2000, 2002, 2003 Free Software
+ Foundation, Inc.
This file is part of GDB.
#include "doublest.h"
#include "gdb_assert.h"
#include "regcache.h"
+#include "block.h"
/* Prototypes for exported functions. */
VALUE_ENCLOSING_TYPE (val) = type;
VALUE_LVAL (val) = not_lval;
VALUE_ADDRESS (val) = 0;
- VALUE_FRAME (val) = 0;
+ VALUE_FRAME_ID (val) = null_frame_id;
VALUE_OFFSET (val) = 0;
VALUE_BITPOS (val) = 0;
VALUE_BITSIZE (val) = 0;
struct value *
value_copy (struct value *arg)
{
- register struct type *encl_type = VALUE_ENCLOSING_TYPE (arg);
+ struct type *encl_type = VALUE_ENCLOSING_TYPE (arg);
struct value *val = allocate_value (encl_type);
VALUE_TYPE (val) = VALUE_TYPE (arg);
VALUE_LVAL (val) = VALUE_LVAL (arg);
VALUE_OFFSET (val) = VALUE_OFFSET (arg);
VALUE_BITPOS (val) = VALUE_BITPOS (arg);
VALUE_BITSIZE (val) = VALUE_BITSIZE (arg);
- VALUE_FRAME (val) = VALUE_FRAME (arg);
+ VALUE_FRAME_ID (val) = VALUE_FRAME_ID (arg);
VALUE_REGNO (val) = VALUE_REGNO (arg);
VALUE_LAZY (val) = VALUE_LAZY (arg);
VALUE_OPTIMIZED_OUT (val) = VALUE_OPTIMIZED_OUT (arg);
access_value_history (int num)
{
struct value_history_chunk *chunk;
- register int i;
- register int absnum = num;
+ int i;
+ int absnum = num;
if (absnum <= 0)
absnum += value_history_count;
clear_value_history (void)
{
struct value_history_chunk *next;
- register int i;
+ int i;
struct value *val;
while (value_history_chain)
static void
show_values (char *num_exp, int from_tty)
{
- register int i;
+ int i;
struct value *val;
static int num = 1;
struct internalvar *
lookup_internalvar (char *name)
{
- register struct internalvar *var;
+ struct internalvar *var;
for (var = internalvars; var; var = var->next)
- if (STREQ (var->name, name))
+ if (strcmp (var->name, name) == 0)
return var;
var = (struct internalvar *) xmalloc (sizeof (struct internalvar));
{
struct value *val;
-#ifdef IS_TRAPPED_INTERNALVAR
- if (IS_TRAPPED_INTERNALVAR (var->name))
- return VALUE_OF_TRAPPED_INTERNALVAR (var);
-#endif
-
val = value_copy (var->value);
if (VALUE_LAZY (val))
value_fetch_lazy (val);
set_internalvar_component (struct internalvar *var, int offset, int bitpos,
int bitsize, struct value *newval)
{
- register char *addr = VALUE_CONTENTS (var->value) + offset;
-
-#ifdef IS_TRAPPED_INTERNALVAR
- if (IS_TRAPPED_INTERNALVAR (var->name))
- SET_TRAPPED_INTERNALVAR (var, newval, bitpos, bitsize, offset);
-#endif
+ char *addr = VALUE_CONTENTS (var->value) + offset;
if (bitsize)
modify_field (addr, value_as_long (newval),
{
struct value *newval;
-#ifdef IS_TRAPPED_INTERNALVAR
- if (IS_TRAPPED_INTERNALVAR (var->name))
- SET_TRAPPED_INTERNALVAR (var, val, 0, 0, 0);
-#endif
-
newval = value_copy (val);
newval->modifiable = 1;
void
clear_internalvars (void)
{
- register struct internalvar *var;
+ struct internalvar *var;
while (internalvars)
{
static void
show_convenience (char *ignore, int from_tty)
{
- register struct internalvar *var;
+ struct internalvar *var;
int varseen = 0;
for (var = internalvars; var; var = var->next)
{
-#ifdef IS_TRAPPED_INTERNALVAR
- if (IS_TRAPPED_INTERNALVAR (var->name))
- continue;
-#endif
if (!varseen)
{
varseen = 1;
to an INT (or some size). After all, it is only an offset. */
LONGEST
-unpack_long (struct type *type, char *valaddr)
+unpack_long (struct type *type, const char *valaddr)
{
- register enum type_code code = TYPE_CODE (type);
- register int len = TYPE_LENGTH (type);
- register int nosign = TYPE_UNSIGNED (type);
+ enum type_code code = TYPE_CODE (type);
+ int len = TYPE_LENGTH (type);
+ int nosign = TYPE_UNSIGNED (type);
if (current_language->la_language == language_scm
&& is_scmvalue_type (type))
format, result is in host format. */
DOUBLEST
-unpack_double (struct type *type, char *valaddr, int *invp)
+unpack_double (struct type *type, const char *valaddr, int *invp)
{
enum type_code code;
int len;
also not defined either. Oops!
Hopefully someone will add both the missing floatformat
- definitions and floatformat_is_invalid() function. */
+ definitions and the new cases for floatformat_is_valid (). */
+
+ if (!floatformat_is_valid (floatformat_from_type (type), valaddr))
+ {
+ *invp = 1;
+ return 0.0;
+ }
+
return extract_typed_floating (valaddr, type);
}
else if (nosign)
to an INT (or some size). After all, it is only an offset. */
CORE_ADDR
-unpack_pointer (struct type *type, char *valaddr)
+unpack_pointer (struct type *type, const char *valaddr)
{
/* Assume a CORE_ADDR can fit in a LONGEST (for now). Not sure
whether we want this to be true eventually. */
struct value *
value_static_field (struct type *type, int fieldno)
{
- CORE_ADDR addr;
- asection *sect;
+ struct value *retval;
+
if (TYPE_FIELD_STATIC_HAS_ADDR (type, fieldno))
{
- addr = TYPE_FIELD_STATIC_PHYSADDR (type, fieldno);
- sect = NULL;
+ retval = value_at (TYPE_FIELD_TYPE (type, fieldno),
+ TYPE_FIELD_STATIC_PHYSADDR (type, fieldno),
+ NULL);
}
else
{
char *phys_name = TYPE_FIELD_STATIC_PHYSNAME (type, fieldno);
- struct symbol *sym = lookup_symbol (phys_name, 0, VAR_NAMESPACE, 0, NULL);
- /* In some cases (involving uninitalized, unreferenced static
- const integral members), g++ -gdwarf-2 can emit debugging
- information giving rise to symbols whose SYMBOL_CLASS is
- LOC_UNRESOLVED. In that case, do a minimal symbol lookup.
- If it returns a useful value, then the symbol was defined
- elsewhere, so we use that information. Otherwise, return
- NULL. */
- if (sym == NULL || SYMBOL_CLASS (sym) == LOC_UNRESOLVED)
+ struct symbol *sym = lookup_symbol (phys_name, 0, VAR_DOMAIN, 0, NULL);
+ if (sym == NULL)
{
/* With some compilers, e.g. HP aCC, static data members are reported
as non-debuggable symbols */
return NULL;
else
{
- addr = SYMBOL_VALUE_ADDRESS (msym);
- sect = SYMBOL_BFD_SECTION (msym);
+ retval = value_at (TYPE_FIELD_TYPE (type, fieldno),
+ SYMBOL_VALUE_ADDRESS (msym),
+ SYMBOL_BFD_SECTION (msym));
}
}
else
{
- /* Anything static that isn't a constant, has an address */
- if (SYMBOL_CLASS (sym) != LOC_CONST)
- {
- addr = SYMBOL_VALUE_ADDRESS (sym);
- sect = SYMBOL_BFD_SECTION (sym);
- }
- /* However, static const's do not, the value is already known. */
- else
- {
- return value_from_longest (TYPE_FIELD_TYPE (type, fieldno), SYMBOL_VALUE (sym));
- }
+ /* SYM should never have a SYMBOL_CLASS which will require
+ read_var_value to use the FRAME parameter. */
+ if (symbol_read_needs_frame (sym))
+ warning ("static field's value depends on the current "
+ "frame - bad debug info?");
+ retval = read_var_value (sym, NULL);
}
- SET_FIELD_PHYSADDR (TYPE_FIELD (type, fieldno), addr);
+ if (retval && VALUE_LVAL (retval) == lval_memory)
+ SET_FIELD_PHYSADDR (TYPE_FIELD (type, fieldno),
+ VALUE_ADDRESS (retval));
}
- return value_at (TYPE_FIELD_TYPE (type, fieldno), addr, sect);
+ return retval;
}
/* Change the enclosing type of a value object VAL to NEW_ENCL_TYPE.
struct value *prev;
new_val = (struct value *) xrealloc (val, sizeof (struct value) + TYPE_LENGTH (new_encl_type));
-
+
+ VALUE_ENCLOSING_TYPE (new_val) = new_encl_type;
+
/* We have to make sure this ends up in the same place in the value
chain as the original copy, so it's clean-up behavior is the same.
If the value has been released, this is a waste of time, but there
struct value *
value_primitive_field (struct value *arg1, int offset,
- register int fieldno, register struct type *arg_type)
+ int fieldno, struct type *arg_type)
{
struct value *v;
- register struct type *type;
+ struct type *type;
CHECK_TYPEDEF (arg_type);
type = TYPE_FIELD_TYPE (arg_type, fieldno);
FIELDNO says which field. */
struct value *
-value_field (struct value *arg1, register int fieldno)
+value_field (struct value *arg1, int fieldno)
{
return value_primitive_field (arg1, 0, fieldno, VALUE_TYPE (arg1));
}
int offset)
{
struct value *v;
- register struct type *ftype = TYPE_FN_FIELD_TYPE (f, j);
+ struct type *ftype = TYPE_FN_FIELD_TYPE (f, j);
char *physname = TYPE_FN_FIELD_PHYSNAME (f, j);
struct symbol *sym;
struct minimal_symbol *msym;
- sym = lookup_symbol (physname, 0, VAR_NAMESPACE, 0, NULL);
+ sym = lookup_symbol (physname, 0, VAR_DOMAIN, 0, NULL);
if (sym != NULL)
{
msym = NULL;
If the field is signed, we also do sign extension. */
LONGEST
-unpack_field_as_long (struct type *type, char *valaddr, int fieldno)
+unpack_field_as_long (struct type *type, const char *valaddr, int fieldno)
{
ULONGEST val;
ULONGEST valmask;
/* Convert C numbers into newly allocated values */
struct value *
-value_from_longest (struct type *type, register LONGEST num)
+value_from_longest (struct type *type, LONGEST num)
{
struct value *val = allocate_value (type);
- register enum type_code code;
- register int len;
+ enum type_code code;
+ int len;
retry:
code = TYPE_CODE (type);
len = TYPE_LENGTH (type);
{
struct value *val = allocate_value (type);
struct type *base_type = check_typedef (type);
- register enum type_code code = TYPE_CODE (base_type);
- register int len = TYPE_LENGTH (base_type);
+ enum type_code code = TYPE_CODE (base_type);
+ int len = TYPE_LENGTH (base_type);
if (code == TYPE_CODE_FLT)
{
return val;
}
\f
-/* Deal with the value that is "about to be returned". */
-
-/* Return the value that a function returning now
- would be returning to its caller, assuming its type is VALTYPE.
- RETBUF is where we look for what ought to be the contents
- of the registers (in raw form). This is because it is often
- desirable to restore old values to those registers
- after saving the contents of interest, and then call
- this function using the saved values.
- struct_return is non-zero when the function in question is
- using the structure return conventions on the machine in question;
- 0 when it is using the value returning conventions (this often
- means returning pointer to where structure is vs. returning value). */
-
-/* ARGSUSED */
+/* Deal with the return-value of a function that has "just returned".
+
+ Extract the return-value (as a "struct value") that a function,
+ using register convention, has just returned to its caller. Assume
+ that the type of the function is VALTYPE, and that the "just
+ returned" register state is found in RETBUF.
+
+ The function has "just returned" because GDB halts a returning
+ function by setting a breakpoint at the return address (in the
+ caller), and not the return instruction (in the callee).
+
+ Because, in the case of a return from an inferior function call,
+ GDB needs to restore the inferiors registers, RETBUF is normally a
+ copy of the inferior's registers. */
+
struct value *
-value_being_returned (struct type *valtype, struct regcache *retbuf,
- int struct_return)
+register_value_being_returned (struct type *valtype, struct regcache *retbuf)
{
- struct value *val;
- CORE_ADDR addr;
-
- /* If this is not defined, just use EXTRACT_RETURN_VALUE instead. */
- if (EXTRACT_STRUCT_VALUE_ADDRESS_P ())
- if (struct_return)
- {
- addr = EXTRACT_STRUCT_VALUE_ADDRESS (retbuf);
- if (!addr)
- error ("Function return value unknown.");
- return value_at (valtype, addr, NULL);
- }
+ struct value *val = allocate_value (valtype);
- /* If this is not defined, just use EXTRACT_RETURN_VALUE instead. */
- if (DEPRECATED_EXTRACT_STRUCT_VALUE_ADDRESS_P ())
- if (struct_return)
- {
- char *buf = deprecated_grub_regcache_for_registers (retbuf);
- addr = DEPRECATED_EXTRACT_STRUCT_VALUE_ADDRESS (buf);
- if (!addr)
- error ("Function return value unknown.");
- return value_at (valtype, addr, NULL);
- }
+ /* If the function returns void, don't bother fetching the return
+ value. See also "using_struct_return". */
+ if (TYPE_CODE (valtype) == TYPE_CODE_VOID)
+ return val;
- val = allocate_value (valtype);
- CHECK_TYPEDEF (valtype);
- EXTRACT_RETURN_VALUE (valtype, retbuf, VALUE_CONTENTS_RAW (val));
+ if (!gdbarch_return_value_p (current_gdbarch))
+ {
+ /* NOTE: cagney/2003-10-20: Unlike "gdbarch_return_value", the
+ EXTRACT_RETURN_VALUE and USE_STRUCT_CONVENTION methods do not
+ handle the edge case of a function returning a small
+ structure / union in registers. */
+ CHECK_TYPEDEF (valtype);
+ EXTRACT_RETURN_VALUE (valtype, retbuf, VALUE_CONTENTS_RAW (val));
+ return val;
+ }
+ /* This function only handles "register convention". */
+ gdb_assert (gdbarch_return_value (current_gdbarch, valtype,
+ NULL, NULL, NULL)
+ == RETURN_VALUE_REGISTER_CONVENTION);
+ gdbarch_return_value (current_gdbarch, valtype, retbuf,
+ VALUE_CONTENTS_RAW (val) /*read*/, NULL /*write*/);
return val;
}
|| TYPE_LENGTH (value_type) == 8));
}
-/* Return true if the function specified is using the structure returning
- convention on this machine to return arguments, or 0 if it is using
- the value returning convention. FUNCTION is the value representing
- the function, FUNCADDR is the address of the function, and VALUE_TYPE
- is the type returned by the function. GCC_P is nonzero if compiled
+/* Return true if the function returning the specified type is using
+ the convention of returning structures in memory (passing in the
+ address as a hidden first parameter). GCC_P is nonzero if compiled
with GCC. */
-/* ARGSUSED */
int
-using_struct_return (struct value *function, CORE_ADDR funcaddr,
- struct type *value_type, int gcc_p)
+using_struct_return (struct type *value_type, int gcc_p)
{
- register enum type_code code = TYPE_CODE (value_type);
+ enum type_code code = TYPE_CODE (value_type);
if (code == TYPE_CODE_ERROR)
error ("Function return type unknown.");
- if (code == TYPE_CODE_STRUCT
- || code == TYPE_CODE_UNION
- || code == TYPE_CODE_ARRAY
- || RETURN_VALUE_ON_STACK (value_type))
- return USE_STRUCT_CONVENTION (gcc_p, value_type);
-
- return 0;
-}
-
-/* Store VAL so it will be returned if a function returns now.
- Does not verify that VAL's type matches what the current
- function wants to return. */
-
-void
-set_return_value (struct value *val)
-{
- struct type *type = check_typedef (VALUE_TYPE (val));
- register enum type_code code = TYPE_CODE (type);
-
- if (code == TYPE_CODE_ERROR)
- error ("Function return type unknown.");
+ if (code == TYPE_CODE_VOID)
+ /* A void return value is never in memory. See also corresponding
+ code in "register_value_being_returned". */
+ return 0;
- if (code == TYPE_CODE_STRUCT
- || code == TYPE_CODE_UNION) /* FIXME, implement struct return. */
- error ("GDB does not support specifying a struct or union return value.");
+ if (!gdbarch_return_value_p (current_gdbarch))
+ {
+ /* FIXME: cagney/2003-10-01: The below is dead. Instead an
+ architecture should implement "gdbarch_return_value". Using
+ that new function it is possible to exactly specify the ABIs
+ "struct return" vs "register return" conventions. */
+ if (code == TYPE_CODE_STRUCT
+ || code == TYPE_CODE_UNION
+ || code == TYPE_CODE_ARRAY
+ || RETURN_VALUE_ON_STACK (value_type))
+ return USE_STRUCT_CONVENTION (gcc_p, value_type);
+ else
+ return 0;
+ }
- STORE_RETURN_VALUE (type, VALUE_CONTENTS (val));
+ /* Probe the architecture for the return-value convention. */
+ return (gdbarch_return_value (current_gdbarch, value_type,
+ NULL, NULL, NULL)
+ == RETURN_VALUE_STRUCT_CONVENTION);
}
-\f
+
void
_initialize_values (void)
{
projects / deliverable / binutils-gdb.git / blobdiff