/* Low level packing and unpacking of values for GDB, the GNU Debugger.
Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
- 1996, 1997, 1998, 1999, 2000, 2002, 2003, 2004, 2005, 2006, 2007, 2008
- Free Software Foundation, Inc.
+ 1996, 1997, 1998, 1999, 2000, 2002, 2003, 2004, 2005, 2006, 2007, 2008,
+ 2009, 2010, 2011 Free Software Foundation, Inc.
This file is part of GDB.
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
+#include "arch-utils.h"
#include "gdb_string.h"
#include "symtab.h"
#include "gdbtypes.h"
#include "regcache.h"
#include "block.h"
#include "dfp.h"
+#include "objfiles.h"
+#include "valprint.h"
+#include "cli/cli-decode.h"
+
+#include "python/python.h"
+
+#include "tracepoint.h"
/* Prototypes for exported functions. */
void _initialize_values (void);
+/* Definition of a user function. */
+struct internal_function
+{
+ /* The name of the function. It is a bit odd to have this in the
+ function itself -- the user might use a differently-named
+ convenience variable to hold the function. */
+ char *name;
+
+ /* The handler. */
+ internal_function_fn handler;
+
+ /* User data for the handler. */
+ void *cookie;
+};
+
+static struct cmd_list_element *functionlist;
+
struct value
{
/* Type of value; either not an lval, or one of the various
/* Pointer to internal variable. */
struct internalvar *internalvar;
+
+ /* If lval == lval_computed, this is a set of function pointers
+ to use to access and describe the value, and a closure pointer
+ for them to use. */
+ struct
+ {
+ struct lval_funcs *funcs; /* Functions to call. */
+ void *closure; /* Closure for those functions to use. */
+ } computed;
} location;
/* Describes offset of a value within lval of a structure in bytes.
int bitsize;
/* Only used for bitfields; position of start of field. For
- BITS_BIG_ENDIAN=0 targets, it is the position of the LSB. For
- BITS_BIG_ENDIAN=1 targets, it is the position of the MSB. */
+ gdbarch_bits_big_endian=0 targets, it is the position of the LSB. For
+ gdbarch_bits_big_endian=1 targets, it is the position of the MSB. */
int bitpos;
+ /* Only used for bitfields; the containing value. This allows a
+ single read from the target when displaying multiple
+ bitfields. */
+ struct value *parent;
+
/* Frame register value is relative to. This will be described in
the lval enum above as "lval_register". */
struct frame_id frame_id;
/* Values are stored in a chain, so that they can be deleted easily
over calls to the inferior. Values assigned to internal
- variables or put into the value history are taken off this
- list. */
+ variables, put into the value history or exposed to Python are
+ taken off this list. */
struct value *next;
/* Register number if the value is from a register. */
short regnum;
/* If zero, contents of this value are in the contents field. If
- nonzero, contents are in inferior memory at address in the
- location.address field plus the offset field (and the lval field
- should be lval_memory).
+ nonzero, contents are in inferior. If the lval field is lval_memory,
+ the contents are in inferior memory at location.address plus offset.
+ The lval field may also be lval_register.
WARNING: This field is used by the code which handles watchpoints
(see breakpoint.c) to decide whether a particular value can be
/* If value is a variable, is it initialized or not. */
int initialized;
- /* Actual contents of the value. For use of this value; setting it
- uses the stuff above. Not valid if lazy is nonzero. Target
- byte-order. We force it to be aligned properly for any possible
- value. Note that a value therefore extends beyond what is
- declared here. */
- union
- {
- gdb_byte contents[1];
- DOUBLEST force_doublest_align;
- LONGEST force_longest_align;
- CORE_ADDR force_core_addr_align;
- void *force_pointer_align;
- } aligner;
- /* Do not add any new members here -- contents above will trash
- them. */
+ /* If value is from the stack. If this is set, read_stack will be
+ used instead of read_memory to enable extra caching. */
+ int stack;
+
+ /* Actual contents of the value. Target byte-order. NULL or not
+ valid if lazy is nonzero. */
+ gdb_byte *contents;
+
+ /* The number of references to this value. When a value is created,
+ the value chain holds a reference, so REFERENCE_COUNT is 1. If
+ release_value is called, this value is removed from the chain but
+ the caller of release_value now has a reference to this value.
+ The caller must arrange for a call to value_free later. */
+ int reference_count;
};
/* Prototypes for local functions. */
static struct value_history_chunk *value_history_chain;
static int value_history_count; /* Abs number of last entry stored */
+
\f
/* List of all value objects currently allocated
(except for those released by calls to release_value)
static struct value *all_values;
-/* Allocate a value that has the correct length for type TYPE. */
+/* Allocate a lazy value for type TYPE. Its actual content is
+ "lazily" allocated too: the content field of the return value is
+ NULL; it will be allocated when it is fetched from the target. */
struct value *
-allocate_value (struct type *type)
+allocate_value_lazy (struct type *type)
{
struct value *val;
- struct type *atype = check_typedef (type);
- val = (struct value *) xzalloc (sizeof (struct value) + TYPE_LENGTH (atype));
+ /* 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 VAL's type
+ description correctly. */
+ check_typedef (type);
+
+ val = (struct value *) xzalloc (sizeof (struct value));
+ val->contents = NULL;
val->next = all_values;
all_values = val;
val->type = type;
val->enclosing_type = type;
VALUE_LVAL (val) = not_lval;
- VALUE_ADDRESS (val) = 0;
+ val->location.address = 0;
VALUE_FRAME_ID (val) = null_frame_id;
val->offset = 0;
val->bitpos = 0;
val->bitsize = 0;
VALUE_REGNUM (val) = -1;
- val->lazy = 0;
+ val->lazy = 1;
val->optimized_out = 0;
val->embedded_offset = 0;
val->pointed_to_offset = 0;
val->modifiable = 1;
val->initialized = 1; /* Default to initialized. */
+
+ /* Values start out on the all_values chain. */
+ val->reference_count = 1;
+
+ return val;
+}
+
+/* Allocate the contents of VAL if it has not been allocated yet. */
+
+void
+allocate_value_contents (struct value *val)
+{
+ if (!val->contents)
+ val->contents = (gdb_byte *) xzalloc (TYPE_LENGTH (val->enclosing_type));
+}
+
+/* Allocate a value and its contents for type TYPE. */
+
+struct value *
+allocate_value (struct type *type)
+{
+ struct value *val = allocate_value_lazy (type);
+
+ allocate_value_contents (val);
+ val->lazy = 0;
return val;
}
/* Allocate a value that has the correct length
- for COUNT repetitions type TYPE. */
+ for COUNT repetitions of type TYPE. */
struct value *
allocate_repeat_value (struct type *type, int count)
int low_bound = current_language->string_lower_bound; /* ??? */
/* FIXME-type-allocation: need a way to free this type when we are
done with it. */
- struct type *range_type
- = create_range_type ((struct type *) NULL, builtin_type_int,
- low_bound, count + low_bound - 1);
- /* FIXME-type-allocation: need a way to free this type when we are
- done with it. */
- return allocate_value (create_array_type ((struct type *) NULL,
- type, range_type));
+ struct type *array_type
+ = lookup_array_range_type (type, low_bound, count + low_bound - 1);
+
+ return allocate_value (array_type);
+}
+
+struct value *
+allocate_computed_value (struct type *type,
+ struct lval_funcs *funcs,
+ void *closure)
+{
+ struct value *v = allocate_value (type);
+
+ VALUE_LVAL (v) = lval_computed;
+ v->location.computed.funcs = funcs;
+ v->location.computed.closure = closure;
+ set_value_lazy (v, 1);
+
+ return v;
}
/* Accessor methods. */
}
struct type *
-value_type (struct value *value)
+value_type (const struct value *value)
{
return value->type;
}
}
int
-value_offset (struct value *value)
+value_offset (const struct value *value)
{
return value->offset;
}
}
int
-value_bitpos (struct value *value)
+value_bitpos (const struct value *value)
{
return value->bitpos;
}
}
int
-value_bitsize (struct value *value)
+value_bitsize (const struct value *value)
{
return value->bitsize;
}
value->bitsize = bit;
}
+struct value *
+value_parent (struct value *value)
+{
+ return value->parent;
+}
+
gdb_byte *
value_contents_raw (struct value *value)
{
- return value->aligner.contents + value->embedded_offset;
+ allocate_value_contents (value);
+ return value->contents + value->embedded_offset;
}
gdb_byte *
value_contents_all_raw (struct value *value)
{
- return value->aligner.contents;
+ allocate_value_contents (value);
+ return value->contents;
}
struct type *
return value->enclosing_type;
}
+static void
+require_not_optimized_out (struct value *value)
+{
+ if (value->optimized_out)
+ error (_("value has been optimized out"));
+}
+
const gdb_byte *
-value_contents_all (struct value *value)
+value_contents_for_printing (struct value *value)
{
if (value->lazy)
value_fetch_lazy (value);
- return value->aligner.contents;
+ return value->contents;
+}
+
+const gdb_byte *
+value_contents_all (struct value *value)
+{
+ const gdb_byte *result = value_contents_for_printing (value);
+ require_not_optimized_out (value);
+ return result;
}
int
value->lazy = val;
}
+int
+value_stack (struct value *value)
+{
+ return value->stack;
+}
+
+void
+set_value_stack (struct value *value, int val)
+{
+ value->stack = val;
+}
+
const gdb_byte *
value_contents (struct value *value)
{
- return value_contents_writeable (value);
+ const gdb_byte *result = value_contents_writeable (value);
+ require_not_optimized_out (value);
+ return result;
}
gdb_byte *
value->optimized_out = val;
}
+int
+value_entirely_optimized_out (const struct value *value)
+{
+ if (!value->optimized_out)
+ return 0;
+ if (value->lval != lval_computed
+ || !value->location.computed.funcs->check_any_valid)
+ return 1;
+ return !value->location.computed.funcs->check_any_valid (value);
+}
+
+int
+value_bits_valid (const struct value *value, int offset, int length)
+{
+ if (value == NULL || !value->optimized_out)
+ return 1;
+ if (value->lval != lval_computed
+ || !value->location.computed.funcs->check_validity)
+ return 0;
+ return value->location.computed.funcs->check_validity (value, offset,
+ length);
+}
+
+int
+value_bits_synthetic_pointer (const struct value *value,
+ int offset, int length)
+{
+ if (value == NULL || value->lval != lval_computed
+ || !value->location.computed.funcs->check_synthetic_pointer)
+ return 0;
+ return value->location.computed.funcs->check_synthetic_pointer (value,
+ offset,
+ length);
+}
+
int
value_embedded_offset (struct value *value)
{
value->pointed_to_offset = val;
}
+struct lval_funcs *
+value_computed_funcs (struct value *v)
+{
+ gdb_assert (VALUE_LVAL (v) == lval_computed);
+
+ return v->location.computed.funcs;
+}
+
+void *
+value_computed_closure (const struct value *v)
+{
+ gdb_assert (v->lval == lval_computed);
+
+ return v->location.computed.closure;
+}
+
enum lval_type *
deprecated_value_lval_hack (struct value *value)
{
return &value->lval;
}
-CORE_ADDR *
-deprecated_value_address_hack (struct value *value)
+CORE_ADDR
+value_address (struct value *value)
+{
+ if (value->lval == lval_internalvar
+ || value->lval == lval_internalvar_component)
+ return 0;
+ return value->location.address + value->offset;
+}
+
+CORE_ADDR
+value_raw_address (struct value *value)
+{
+ if (value->lval == lval_internalvar
+ || value->lval == lval_internalvar_component)
+ return 0;
+ return value->location.address;
+}
+
+void
+set_value_address (struct value *value, CORE_ADDR addr)
{
- return &value->location.address;
+ gdb_assert (value->lval != lval_internalvar
+ && value->lval != lval_internalvar_component);
+ value->location.address = addr;
}
struct internalvar **
return all_values;
}
+/* Take a reference to VAL. VAL will not be deallocated until all
+ references are released. */
+
+void
+value_incref (struct value *val)
+{
+ val->reference_count++;
+}
+
+/* Release a reference to VAL, which was acquired with value_incref.
+ This function is also called to deallocate values from the value
+ chain. */
+
+void
+value_free (struct value *val)
+{
+ if (val)
+ {
+ gdb_assert (val->reference_count > 0);
+ val->reference_count--;
+ if (val->reference_count > 0)
+ return;
+
+ /* If there's an associated parent value, drop our reference to
+ it. */
+ if (val->parent != NULL)
+ value_free (val->parent);
+
+ if (VALUE_LVAL (val) == lval_computed)
+ {
+ struct lval_funcs *funcs = val->location.computed.funcs;
+
+ if (funcs->free_closure)
+ funcs->free_closure (val);
+ }
+
+ xfree (val->contents);
+ }
+ xfree (val);
+}
+
/* Free all values allocated since MARK was obtained by value_mark
(except for those released). */
void
}
/* Free all the values that have been allocated (except for those released).
- Called after each command, successful or not. */
+ Call after each command, successful or not.
+ In practice this is called before each command, which is sufficient. */
void
free_all_values (void)
all_values = 0;
}
+/* Frees all the elements in a chain of values. */
+
+void
+free_value_chain (struct value *v)
+{
+ struct value *next;
+
+ for (; v; v = next)
+ {
+ next = value_next (v);
+ value_free (v);
+ }
+}
+
/* Remove VAL from the chain all_values
so it will not be freed automatically. */
if (all_values == val)
{
all_values = val->next;
+ val->next = NULL;
return;
}
if (v->next == val)
{
v->next = val->next;
+ val->next = NULL;
break;
}
}
value_copy (struct value *arg)
{
struct type *encl_type = value_enclosing_type (arg);
- struct value *val = allocate_value (encl_type);
+ struct value *val;
+
+ if (value_lazy (arg))
+ val = allocate_value_lazy (encl_type);
+ else
+ val = allocate_value (encl_type);
val->type = arg->type;
VALUE_LVAL (val) = VALUE_LVAL (arg);
val->location = arg->location;
TYPE_LENGTH (value_enclosing_type (arg)));
}
+ val->parent = arg->parent;
+ if (val->parent)
+ value_incref (val->parent);
+ if (VALUE_LVAL (val) == lval_computed)
+ {
+ struct lval_funcs *funcs = val->location.computed.funcs;
+
+ if (funcs->copy_closure)
+ val->location.computed.closure = funcs->copy_closure (val);
+ }
return val;
}
+
+/* Return a version of ARG that is non-lvalue. */
+
+struct value *
+value_non_lval (struct value *arg)
+{
+ if (VALUE_LVAL (arg) != not_lval)
+ {
+ struct type *enc_type = value_enclosing_type (arg);
+ struct value *val = allocate_value (enc_type);
+
+ memcpy (value_contents_all_raw (val), value_contents_all (arg),
+ TYPE_LENGTH (enc_type));
+ val->type = arg->type;
+ set_value_embedded_offset (val, value_embedded_offset (arg));
+ set_value_pointed_to_offset (val, value_pointed_to_offset (arg));
+ return val;
+ }
+ return arg;
+}
+
+void
+set_value_component_location (struct value *component,
+ const struct value *whole)
+{
+ if (whole->lval == lval_internalvar)
+ VALUE_LVAL (component) = lval_internalvar_component;
+ else
+ VALUE_LVAL (component) = whole->lval;
+
+ component->location = whole->location;
+ if (whole->lval == lval_computed)
+ {
+ struct lval_funcs *funcs = whole->location.computed.funcs;
+
+ if (funcs->copy_closure)
+ component->location.computed.closure = funcs->copy_closure (whole);
+ }
+}
+
\f
/* Access to the value history. */
if (i == 0)
{
struct value_history_chunk *new
- = (struct value_history_chunk *)
+ = (struct value_history_chunk *)
+
xmalloc (sizeof (struct value_history_chunk));
memset (new->values, 0, sizeof new->values);
new->next = value_history_chain;
/* Now absnum is always absolute and origin zero. */
chunk = value_history_chain;
- for (i = (value_history_count - 1) / VALUE_HISTORY_CHUNK - absnum / VALUE_HISTORY_CHUNK;
+ for (i = (value_history_count - 1) / VALUE_HISTORY_CHUNK
+ - absnum / VALUE_HISTORY_CHUNK;
i > 0; i--)
chunk = chunk->next;
if (num_exp)
{
- /* "info history +" should print from the stored position.
- "info history <exp>" should print around value number <exp>. */
+ /* "show values +" should print from the stored position.
+ "show values <exp>" should print around value number <exp>. */
if (num_exp[0] != '+' || num_exp[1] != '\0')
num = parse_and_eval_long (num_exp) - 5;
}
else
{
- /* "info history" means print the last 10 values. */
+ /* "show values" means print the last 10 values. */
num = value_history_count - 9;
}
for (i = num; i < num + 10 && i <= value_history_count; i++)
{
+ struct value_print_options opts;
+
val = access_value_history (i);
printf_filtered (("$%d = "), i);
- value_print (val, gdb_stdout, 0, Val_pretty_default);
+ get_user_print_options (&opts);
+ value_print (val, gdb_stdout, &opts);
printf_filtered (("\n"));
}
- /* The next "info history +" should start after what we just printed. */
+ /* The next "show values +" should start after what we just printed. */
num += 10;
/* Hitting just return after this command should do the same thing as
- "info history +". If num_exp is null, this is unnecessary, since
- "info history +" is not useful after "info history". */
+ "show values +". If num_exp is null, this is unnecessary, since
+ "show values +" is not useful after "show values". */
if (from_tty && num_exp)
{
num_exp[0] = '+';
The user refers to them with a '$' prefix
that does not appear in the variable names stored internally. */
+struct internalvar
+{
+ struct internalvar *next;
+ char *name;
+
+ /* We support various different kinds of content of an internal variable.
+ enum internalvar_kind specifies the kind, and union internalvar_data
+ provides the data associated with this particular kind. */
+
+ enum internalvar_kind
+ {
+ /* The internal variable is empty. */
+ INTERNALVAR_VOID,
+
+ /* The value of the internal variable is provided directly as
+ a GDB value object. */
+ INTERNALVAR_VALUE,
+
+ /* A fresh value is computed via a call-back routine on every
+ access to the internal variable. */
+ INTERNALVAR_MAKE_VALUE,
+
+ /* The internal variable holds a GDB internal convenience function. */
+ INTERNALVAR_FUNCTION,
+
+ /* The variable holds an integer value. */
+ INTERNALVAR_INTEGER,
+
+ /* The variable holds a pointer value. */
+ INTERNALVAR_POINTER,
+
+ /* The variable holds a GDB-provided string. */
+ INTERNALVAR_STRING,
+
+ } kind;
+
+ union internalvar_data
+ {
+ /* A value object used with INTERNALVAR_VALUE. */
+ struct value *value;
+
+ /* The call-back routine used with INTERNALVAR_MAKE_VALUE. */
+ internalvar_make_value make_value;
+
+ /* The internal function used with INTERNALVAR_FUNCTION. */
+ struct
+ {
+ struct internal_function *function;
+ /* True if this is the canonical name for the function. */
+ int canonical;
+ } fn;
+
+ /* An integer value used with INTERNALVAR_INTEGER. */
+ struct
+ {
+ /* If type is non-NULL, it will be used as the type to generate
+ a value for this internal variable. If type is NULL, a default
+ integer type for the architecture is used. */
+ struct type *type;
+ LONGEST val;
+ } integer;
+
+ /* A pointer value used with INTERNALVAR_POINTER. */
+ struct
+ {
+ struct type *type;
+ CORE_ADDR val;
+ } pointer;
+
+ /* A string value used with INTERNALVAR_STRING. */
+ char *string;
+ } u;
+};
+
static struct internalvar *internalvars;
-/* If the variable does not already exist create it and give it the value given.
- If no value is given then the default is zero. */
+/* If the variable does not already exist create it and give it the
+ value given. If no value is given then the default is zero. */
static void
init_if_undefined_command (char* args, int from_tty)
{
/* Extract the variable from the parsed expression.
In the case of an assign the lvalue will be in elts[1] and elts[2]. */
if (expr->elts[1].opcode != OP_INTERNALVAR)
- error (_("The first parameter to init-if-undefined should be a GDB variable."));
+ error (_("The first parameter to init-if-undefined "
+ "should be a GDB variable."));
intvar = expr->elts[2].internalvar;
/* Only evaluate the expression if the lvalue is void.
This may still fail if the expresssion is invalid. */
- if (TYPE_CODE (value_type (intvar->value)) == TYPE_CODE_VOID)
+ if (intvar->kind == INTERNALVAR_VOID)
evaluate_expression (expr);
do_cleanups (old_chain);
the return value is NULL. */
struct internalvar *
-lookup_only_internalvar (char *name)
+lookup_only_internalvar (const char *name)
{
struct internalvar *var;
NAME should not normally include a dollar sign. */
struct internalvar *
-create_internalvar (char *name)
+create_internalvar (const char *name)
{
struct internalvar *var;
+
var = (struct internalvar *) xmalloc (sizeof (struct internalvar));
var->name = concat (name, (char *)NULL);
- var->value = allocate_value (builtin_type_void);
- var->endian = gdbarch_byte_order (current_gdbarch);
- release_value (var->value);
+ var->kind = INTERNALVAR_VOID;
var->next = internalvars;
internalvars = var;
return var;
}
+/* Create an internal variable with name NAME and register FUN as the
+ function that value_of_internalvar uses to create a value whenever
+ this variable is referenced. NAME should not normally include a
+ dollar sign. */
+
+struct internalvar *
+create_internalvar_type_lazy (char *name, internalvar_make_value fun)
+{
+ struct internalvar *var = create_internalvar (name);
+
+ var->kind = INTERNALVAR_MAKE_VALUE;
+ var->u.make_value = fun;
+ return var;
+}
/* Look up an internal variable with name NAME. NAME should not
normally include a dollar sign.
one is created, with a void value. */
struct internalvar *
-lookup_internalvar (char *name)
+lookup_internalvar (const char *name)
{
struct internalvar *var;
return create_internalvar (name);
}
+/* Return current value of internal variable VAR. For variables that
+ are not inherently typed, use a value type appropriate for GDBARCH. */
+
struct value *
-value_of_internalvar (struct internalvar *var)
+value_of_internalvar (struct gdbarch *gdbarch, struct internalvar *var)
{
struct value *val;
- int i, j;
- gdb_byte temp;
+ struct trace_state_variable *tsv;
- val = value_copy (var->value);
- if (value_lazy (val))
- value_fetch_lazy (val);
- VALUE_LVAL (val) = lval_internalvar;
- VALUE_INTERNALVAR (val) = var;
+ /* If there is a trace state variable of the same name, assume that
+ is what we really want to see. */
+ tsv = find_trace_state_variable (var->name);
+ if (tsv)
+ {
+ tsv->value_known = target_get_trace_state_variable_value (tsv->number,
+ &(tsv->value));
+ if (tsv->value_known)
+ val = value_from_longest (builtin_type (gdbarch)->builtin_int64,
+ tsv->value);
+ else
+ val = allocate_value (builtin_type (gdbarch)->builtin_void);
+ return val;
+ }
+
+ switch (var->kind)
+ {
+ case INTERNALVAR_VOID:
+ val = allocate_value (builtin_type (gdbarch)->builtin_void);
+ break;
+
+ case INTERNALVAR_FUNCTION:
+ val = allocate_value (builtin_type (gdbarch)->internal_fn);
+ break;
+
+ case INTERNALVAR_INTEGER:
+ if (!var->u.integer.type)
+ val = value_from_longest (builtin_type (gdbarch)->builtin_int,
+ var->u.integer.val);
+ else
+ val = value_from_longest (var->u.integer.type, var->u.integer.val);
+ break;
+
+ case INTERNALVAR_POINTER:
+ val = value_from_pointer (var->u.pointer.type, var->u.pointer.val);
+ break;
+
+ case INTERNALVAR_STRING:
+ val = value_cstring (var->u.string, strlen (var->u.string),
+ builtin_type (gdbarch)->builtin_char);
+ break;
- /* Values are always stored in the target's byte order. When connected to a
- target this will most likely always be correct, so there's normally no
- need to worry about it.
+ case INTERNALVAR_VALUE:
+ val = value_copy (var->u.value);
+ if (value_lazy (val))
+ value_fetch_lazy (val);
+ break;
+
+ case INTERNALVAR_MAKE_VALUE:
+ val = (*var->u.make_value) (gdbarch, var);
+ break;
+
+ default:
+ internal_error (__FILE__, __LINE__, "bad kind");
+ }
+
+ /* Change the VALUE_LVAL to lval_internalvar so that future operations
+ on this value go back to affect the original internal variable.
- However, internal variables can be set up before the target endian is
- known and so may become out of date. Fix it up before anybody sees.
+ Do not do this for INTERNALVAR_MAKE_VALUE variables, as those have
+ no underlying modifyable state in the internal variable.
- Internal variables usually hold simple scalar values, and we can
- correct those. More complex values (e.g. structures and floating
- point types) are left alone, because they would be too complicated
- to correct. */
+ Likewise, if the variable's value is a computed lvalue, we want
+ references to it to produce another computed lvalue, where
+ references and assignments actually operate through the
+ computed value's functions.
- if (var->endian != gdbarch_byte_order (current_gdbarch))
+ This means that internal variables with computed values
+ behave a little differently from other internal variables:
+ assignments to them don't just replace the previous value
+ altogether. At the moment, this seems like the behavior we
+ want. */
+
+ if (var->kind != INTERNALVAR_MAKE_VALUE
+ && val->lval != lval_computed)
{
- gdb_byte *array = value_contents_raw (val);
- struct type *type = check_typedef (value_enclosing_type (val));
- switch (TYPE_CODE (type))
- {
- case TYPE_CODE_INT:
- case TYPE_CODE_PTR:
- /* Reverse the bytes. */
- for (i = 0, j = TYPE_LENGTH (type) - 1; i < j; i++, j--)
- {
- temp = array[j];
- array[j] = array[i];
- array[i] = temp;
- }
- break;
- }
+ VALUE_LVAL (val) = lval_internalvar;
+ VALUE_INTERNALVAR (val) = var;
}
return val;
}
+int
+get_internalvar_integer (struct internalvar *var, LONGEST *result)
+{
+ switch (var->kind)
+ {
+ case INTERNALVAR_INTEGER:
+ *result = var->u.integer.val;
+ return 1;
+
+ default:
+ return 0;
+ }
+}
+
+static int
+get_internalvar_function (struct internalvar *var,
+ struct internal_function **result)
+{
+ switch (var->kind)
+ {
+ case INTERNALVAR_FUNCTION:
+ *result = var->u.fn.function;
+ return 1;
+
+ default:
+ return 0;
+ }
+}
+
void
set_internalvar_component (struct internalvar *var, int offset, int bitpos,
int bitsize, struct value *newval)
{
- gdb_byte *addr = value_contents_writeable (var->value) + offset;
+ gdb_byte *addr;
- if (bitsize)
- modify_field (addr, value_as_long (newval),
- bitpos, bitsize);
- else
- memcpy (addr, value_contents (newval), TYPE_LENGTH (value_type (newval)));
+ switch (var->kind)
+ {
+ case INTERNALVAR_VALUE:
+ addr = value_contents_writeable (var->u.value);
+
+ if (bitsize)
+ modify_field (value_type (var->u.value), addr + offset,
+ value_as_long (newval), bitpos, bitsize);
+ else
+ memcpy (addr + offset, value_contents (newval),
+ TYPE_LENGTH (value_type (newval)));
+ break;
+
+ default:
+ /* We can never get a component of any other kind. */
+ internal_error (__FILE__, __LINE__, "set_internalvar_component");
+ }
}
void
set_internalvar (struct internalvar *var, struct value *val)
{
- struct value *newval;
-
- newval = value_copy (val);
- newval->modifiable = 1;
-
- /* Force the value to be fetched from the target now, to avoid problems
- later when this internalvar is referenced and the target is gone or
- has changed. */
- if (value_lazy (newval))
- value_fetch_lazy (newval);
-
- /* Begin code which must not call error(). If var->value points to
- something free'd, an error() obviously leaves a dangling pointer.
- But we also get a danling pointer if var->value points to
- something in the value chain (i.e., before release_value is
- called), because after the error free_all_values will get called before
- long. */
- xfree (var->value);
- var->value = newval;
- var->endian = gdbarch_byte_order (current_gdbarch);
- release_value (newval);
+ enum internalvar_kind new_kind;
+ union internalvar_data new_data = { 0 };
+
+ if (var->kind == INTERNALVAR_FUNCTION && var->u.fn.canonical)
+ error (_("Cannot overwrite convenience function %s"), var->name);
+
+ /* Prepare new contents. */
+ switch (TYPE_CODE (check_typedef (value_type (val))))
+ {
+ case TYPE_CODE_VOID:
+ new_kind = INTERNALVAR_VOID;
+ break;
+
+ case TYPE_CODE_INTERNAL_FUNCTION:
+ gdb_assert (VALUE_LVAL (val) == lval_internalvar);
+ new_kind = INTERNALVAR_FUNCTION;
+ get_internalvar_function (VALUE_INTERNALVAR (val),
+ &new_data.fn.function);
+ /* Copies created here are never canonical. */
+ break;
+
+ case TYPE_CODE_INT:
+ new_kind = INTERNALVAR_INTEGER;
+ new_data.integer.type = value_type (val);
+ new_data.integer.val = value_as_long (val);
+ break;
+
+ case TYPE_CODE_PTR:
+ new_kind = INTERNALVAR_POINTER;
+ new_data.pointer.type = value_type (val);
+ new_data.pointer.val = value_as_address (val);
+ break;
+
+ default:
+ new_kind = INTERNALVAR_VALUE;
+ new_data.value = value_copy (val);
+ new_data.value->modifiable = 1;
+
+ /* Force the value to be fetched from the target now, to avoid problems
+ later when this internalvar is referenced and the target is gone or
+ has changed. */
+ if (value_lazy (new_data.value))
+ value_fetch_lazy (new_data.value);
+
+ /* Release the value from the value chain to prevent it from being
+ deleted by free_all_values. From here on this function should not
+ call error () until new_data is installed into the var->u to avoid
+ leaking memory. */
+ release_value (new_data.value);
+ break;
+ }
+
+ /* Clean up old contents. */
+ clear_internalvar (var);
+
+ /* Switch over. */
+ var->kind = new_kind;
+ var->u = new_data;
/* End code which must not call error(). */
}
+void
+set_internalvar_integer (struct internalvar *var, LONGEST l)
+{
+ /* Clean up old contents. */
+ clear_internalvar (var);
+
+ var->kind = INTERNALVAR_INTEGER;
+ var->u.integer.type = NULL;
+ var->u.integer.val = l;
+}
+
+void
+set_internalvar_string (struct internalvar *var, const char *string)
+{
+ /* Clean up old contents. */
+ clear_internalvar (var);
+
+ var->kind = INTERNALVAR_STRING;
+ var->u.string = xstrdup (string);
+}
+
+static void
+set_internalvar_function (struct internalvar *var, struct internal_function *f)
+{
+ /* Clean up old contents. */
+ clear_internalvar (var);
+
+ var->kind = INTERNALVAR_FUNCTION;
+ var->u.fn.function = f;
+ var->u.fn.canonical = 1;
+ /* Variables installed here are always the canonical version. */
+}
+
+void
+clear_internalvar (struct internalvar *var)
+{
+ /* Clean up old contents. */
+ switch (var->kind)
+ {
+ case INTERNALVAR_VALUE:
+ value_free (var->u.value);
+ break;
+
+ case INTERNALVAR_STRING:
+ xfree (var->u.string);
+ break;
+
+ default:
+ break;
+ }
+
+ /* Reset to void kind. */
+ var->kind = INTERNALVAR_VOID;
+}
+
char *
internalvar_name (struct internalvar *var)
{
return var->name;
}
+static struct internal_function *
+create_internal_function (const char *name,
+ internal_function_fn handler, void *cookie)
+{
+ struct internal_function *ifn = XNEW (struct internal_function);
+
+ ifn->name = xstrdup (name);
+ ifn->handler = handler;
+ ifn->cookie = cookie;
+ return ifn;
+}
+
+char *
+value_internal_function_name (struct value *val)
+{
+ struct internal_function *ifn;
+ int result;
+
+ gdb_assert (VALUE_LVAL (val) == lval_internalvar);
+ result = get_internalvar_function (VALUE_INTERNALVAR (val), &ifn);
+ gdb_assert (result);
+
+ return ifn->name;
+}
+
+struct value *
+call_internal_function (struct gdbarch *gdbarch,
+ const struct language_defn *language,
+ struct value *func, int argc, struct value **argv)
+{
+ struct internal_function *ifn;
+ int result;
+
+ gdb_assert (VALUE_LVAL (func) == lval_internalvar);
+ result = get_internalvar_function (VALUE_INTERNALVAR (func), &ifn);
+ gdb_assert (result);
+
+ return (*ifn->handler) (gdbarch, language, ifn->cookie, argc, argv);
+}
+
+/* The 'function' command. This does nothing -- it is just a
+ placeholder to let "help function NAME" work. This is also used as
+ the implementation of the sub-command that is created when
+ registering an internal function. */
+static void
+function_command (char *command, int from_tty)
+{
+ /* Do nothing. */
+}
+
+/* Clean up if an internal function's command is destroyed. */
+static void
+function_destroyer (struct cmd_list_element *self, void *ignore)
+{
+ xfree (self->name);
+ xfree (self->doc);
+}
+
+/* Add a new internal function. NAME is the name of the function; DOC
+ is a documentation string describing the function. HANDLER is
+ called when the function is invoked. COOKIE is an arbitrary
+ pointer which is passed to HANDLER and is intended for "user
+ data". */
+void
+add_internal_function (const char *name, const char *doc,
+ internal_function_fn handler, void *cookie)
+{
+ struct cmd_list_element *cmd;
+ struct internal_function *ifn;
+ struct internalvar *var = lookup_internalvar (name);
+
+ ifn = create_internal_function (name, handler, cookie);
+ set_internalvar_function (var, ifn);
+
+ cmd = add_cmd (xstrdup (name), no_class, function_command, (char *) doc,
+ &functionlist);
+ cmd->destroyer = function_destroyer;
+}
+
/* Update VALUE before discarding OBJFILE. COPIED_TYPES is used to
prevent cycles / duplicates. */
-static void
+void
preserve_one_value (struct value *value, struct objfile *objfile,
htab_t copied_types)
{
copied_types);
}
+/* Likewise for internal variable VAR. */
+
+static void
+preserve_one_internalvar (struct internalvar *var, struct objfile *objfile,
+ htab_t copied_types)
+{
+ switch (var->kind)
+ {
+ case INTERNALVAR_INTEGER:
+ if (var->u.integer.type && TYPE_OBJFILE (var->u.integer.type) == objfile)
+ var->u.integer.type
+ = copy_type_recursive (objfile, var->u.integer.type, copied_types);
+ break;
+
+ case INTERNALVAR_POINTER:
+ if (TYPE_OBJFILE (var->u.pointer.type) == objfile)
+ var->u.pointer.type
+ = copy_type_recursive (objfile, var->u.pointer.type, copied_types);
+ break;
+
+ case INTERNALVAR_VALUE:
+ preserve_one_value (var->u.value, objfile, copied_types);
+ break;
+ }
+}
+
/* Update the internal variables and value history when OBJFILE is
discarded; we must copy the types out of the objfile. New global types
will be created for every convenience variable which currently points to
preserve_one_value (cur->values[i], objfile, copied_types);
for (var = internalvars; var; var = var->next)
- preserve_one_value (var->value, objfile, copied_types);
+ preserve_one_internalvar (var, objfile, copied_types);
+
+ preserve_python_values (objfile, copied_types);
htab_delete (copied_types);
}
static void
show_convenience (char *ignore, int from_tty)
{
+ struct gdbarch *gdbarch = get_current_arch ();
struct internalvar *var;
int varseen = 0;
+ struct value_print_options opts;
+ get_user_print_options (&opts);
for (var = internalvars; var; var = var->next)
{
if (!varseen)
varseen = 1;
}
printf_filtered (("$%s = "), var->name);
- value_print (value_of_internalvar (var), gdb_stdout,
- 0, Val_pretty_default);
+ value_print (value_of_internalvar (gdbarch, var), gdb_stdout,
+ &opts);
printf_filtered (("\n"));
}
if (!varseen)
- printf_unfiltered (_("\
-No debugger convenience variables now defined.\n\
-Convenience variables have names starting with \"$\";\n\
-use \"set\" as in \"set $foo = 5\" to define them.\n"));
+ printf_unfiltered (_("No debugger convenience variables now defined.\n"
+ "Convenience variables have "
+ "names starting with \"$\";\n"
+ "use \"set\" as in \"set "
+ "$foo = 5\" to define them.\n"));
}
\f
/* Extract a value as a C number (either long or double).
error (_("Invalid floating value found in program."));
return foo;
}
+
/* Extract a value as a C pointer. Does not deallocate the value.
Note that val's type may not actually be a pointer; value_as_long
handles all the cases. */
CORE_ADDR
value_as_address (struct value *val)
{
+ struct gdbarch *gdbarch = get_type_arch (value_type (val));
+
/* Assume a CORE_ADDR can fit in a LONGEST (for now). Not sure
whether we want this to be true eventually. */
#if 0
/* gdbarch_addr_bits_remove is wrong if we are being called for a
non-address (e.g. argument to "signal", "info break", etc.), or
for pointers to char, in which the low bits *are* significant. */
- return gdbarch_addr_bits_remove (current_gdbarch, value_as_long (val));
+ return gdbarch_addr_bits_remove (gdbarch, value_as_long (val));
#else
/* There are several targets (IA-64, PowerPC, and others) which
Upon entry to this function, if VAL is a value of type `function'
(that is, TYPE_CODE (VALUE_TYPE (val)) == TYPE_CODE_FUNC), then
- VALUE_ADDRESS (val) is the address of the function. This is what
+ value_address (val) is the address of the function. This is what
you'll get if you evaluate an expression like `main'. The call
to COERCE_ARRAY below actually does all the usual unary
conversions, which includes converting values of type `function'
function, just return its address directly. */
if (TYPE_CODE (value_type (val)) == TYPE_CODE_FUNC
|| TYPE_CODE (value_type (val)) == TYPE_CODE_METHOD)
- return VALUE_ADDRESS (val);
+ return value_address (val);
val = coerce_array (val);
if (TYPE_CODE (value_type (val)) != TYPE_CODE_PTR
&& TYPE_CODE (value_type (val)) != TYPE_CODE_REF
- && gdbarch_integer_to_address_p (current_gdbarch))
- return gdbarch_integer_to_address (current_gdbarch, value_type (val),
+ && gdbarch_integer_to_address_p (gdbarch))
+ return gdbarch_integer_to_address (gdbarch, value_type (val),
value_contents (val));
return unpack_long (value_type (val), value_contents (val));
LONGEST
unpack_long (struct type *type, const gdb_byte *valaddr)
{
+ enum bfd_endian byte_order = gdbarch_byte_order (get_type_arch (type));
enum type_code code = TYPE_CODE (type);
int len = TYPE_LENGTH (type);
int nosign = TYPE_UNSIGNED (type);
case TYPE_CODE_RANGE:
case TYPE_CODE_MEMBERPTR:
if (nosign)
- return extract_unsigned_integer (valaddr, len);
+ return extract_unsigned_integer (valaddr, len, byte_order);
else
- return extract_signed_integer (valaddr, len);
+ return extract_signed_integer (valaddr, len, byte_order);
case TYPE_CODE_FLT:
return extract_typed_floating (valaddr, type);
+ case TYPE_CODE_DECFLOAT:
+ /* libdecnumber has a function to convert from decimal to integer, but
+ it doesn't work when the decimal number has a fractional part. */
+ return decimal_to_doublest (valaddr, len, byte_order);
+
case TYPE_CODE_PTR:
case TYPE_CODE_REF:
/* Assume a CORE_ADDR can fit in a LONGEST (for now). Not sure
DOUBLEST
unpack_double (struct type *type, const gdb_byte *valaddr, int *invp)
{
+ enum bfd_endian byte_order = gdbarch_byte_order (get_type_arch (type));
enum type_code code;
int len;
int nosign;
return extract_typed_floating (valaddr, type);
}
+ else if (code == TYPE_CODE_DECFLOAT)
+ return decimal_to_doublest (valaddr, len, byte_order);
else if (nosign)
{
/* Unsigned -- be sure we compensate for signed LONGEST. */
}
\f
-/* Get the value of the FIELDN'th field (which must be static) of
+/* Get the value of the FIELDNO'th field (which must be static) of
TYPE. Return NULL if the field doesn't exist or has been
optimized out. */
{
struct value *retval;
- if (TYPE_FIELD_STATIC_HAS_ADDR (type, fieldno))
+ switch (TYPE_FIELD_LOC_KIND (type, fieldno))
{
- retval = value_at (TYPE_FIELD_TYPE (type, fieldno),
- TYPE_FIELD_STATIC_PHYSADDR (type, fieldno));
- }
- else
+ case FIELD_LOC_KIND_PHYSADDR:
+ retval = value_at_lazy (TYPE_FIELD_TYPE (type, fieldno),
+ TYPE_FIELD_STATIC_PHYSADDR (type, fieldno));
+ break;
+ case FIELD_LOC_KIND_PHYSNAME:
{
char *phys_name = TYPE_FIELD_STATIC_PHYSNAME (type, fieldno);
- struct symbol *sym = lookup_symbol (phys_name, 0, VAR_DOMAIN, 0, NULL);
+ /*TYPE_FIELD_NAME (type, fieldno);*/
+ struct symbol *sym = lookup_symbol (phys_name, 0, VAR_DOMAIN, 0);
+
if (sym == NULL)
{
- /* With some compilers, e.g. HP aCC, static data members are reported
- as non-debuggable symbols */
- struct minimal_symbol *msym = lookup_minimal_symbol (phys_name, NULL, NULL);
+ /* With some compilers, e.g. HP aCC, static data members are
+ reported as non-debuggable symbols */
+ struct minimal_symbol *msym = lookup_minimal_symbol (phys_name,
+ NULL, NULL);
+
if (!msym)
return NULL;
else
{
- retval = value_at (TYPE_FIELD_TYPE (type, fieldno),
- SYMBOL_VALUE_ADDRESS (msym));
+ retval = value_at_lazy (TYPE_FIELD_TYPE (type, fieldno),
+ SYMBOL_VALUE_ADDRESS (msym));
}
}
else
- {
- /* 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);
- }
- if (retval && VALUE_LVAL (retval) == lval_memory)
- SET_FIELD_PHYSADDR (TYPE_FIELD (type, fieldno),
- VALUE_ADDRESS (retval));
+ retval = value_of_variable (sym, NULL);
+ break;
}
+ default:
+ gdb_assert_not_reached ("unexpected field location kind");
+ }
+
return retval;
}
-/* Change the enclosing type of a value object VAL to NEW_ENCL_TYPE.
- You have to be careful here, since the size of the data area for the value
- is set by the length of the enclosing type. So if NEW_ENCL_TYPE is bigger
- than the old enclosing type, you have to allocate more space for the data.
- The return value is a pointer to the new version of this value structure. */
+/* Change the enclosing type of a value object VAL to NEW_ENCL_TYPE.
+ You have to be careful here, since the size of the data area for the value
+ is set by the length of the enclosing type. So if NEW_ENCL_TYPE is bigger
+ than the old enclosing type, you have to allocate more space for the
+ data. */
-struct value *
-value_change_enclosing_type (struct value *val, struct type *new_encl_type)
+void
+set_value_enclosing_type (struct value *val, struct type *new_encl_type)
{
- if (TYPE_LENGTH (new_encl_type) <= TYPE_LENGTH (value_enclosing_type (val)))
- {
- val->enclosing_type = new_encl_type;
- return val;
- }
- else
- {
- struct value *new_val;
- struct value *prev;
-
- new_val = (struct value *) xrealloc (val, sizeof (struct value) + TYPE_LENGTH (new_encl_type));
-
- new_val->enclosing_type = 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
- is no way to tell that in advance, so... */
-
- if (val != all_values)
- {
- for (prev = all_values; prev != NULL; prev = prev->next)
- {
- if (prev->next == val)
- {
- prev->next = new_val;
- break;
- }
- }
- }
-
- return new_val;
- }
+ if (TYPE_LENGTH (new_encl_type) > TYPE_LENGTH (value_enclosing_type (val)))
+ val->contents =
+ (gdb_byte *) xrealloc (val->contents, TYPE_LENGTH (new_encl_type));
+
+ val->enclosing_type = new_encl_type;
}
/* Given a value ARG1 (offset by OFFSET bytes)
CHECK_TYPEDEF (arg_type);
type = TYPE_FIELD_TYPE (arg_type, fieldno);
+ /* 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 print the type
+ description correctly. */
+ check_typedef (type);
+
/* Handle packed fields */
if (TYPE_FIELD_BITSIZE (arg_type, fieldno))
{
- v = value_from_longest (type,
- unpack_field_as_long (arg_type,
- value_contents (arg1)
- + offset,
- fieldno));
- v->bitpos = TYPE_FIELD_BITPOS (arg_type, fieldno) % 8;
+ /* Create a new value for the bitfield, with bitpos and bitsize
+ set. If possible, arrange offset and bitpos so that we can
+ do a single aligned read of the size of the containing type.
+ Otherwise, adjust offset to the byte containing the first
+ bit. Assume that the address, offset, and embedded offset
+ are sufficiently aligned. */
+ int bitpos = TYPE_FIELD_BITPOS (arg_type, fieldno);
+ int container_bitsize = TYPE_LENGTH (type) * 8;
+
+ v = allocate_value_lazy (type);
v->bitsize = TYPE_FIELD_BITSIZE (arg_type, fieldno);
- v->offset = value_offset (arg1) + offset
- + TYPE_FIELD_BITPOS (arg_type, fieldno) / 8;
+ if ((bitpos % container_bitsize) + v->bitsize <= container_bitsize
+ && TYPE_LENGTH (type) <= (int) sizeof (LONGEST))
+ v->bitpos = bitpos % container_bitsize;
+ else
+ v->bitpos = bitpos % 8;
+ v->offset = (value_embedded_offset (arg1)
+ + offset
+ + (bitpos - v->bitpos) / 8);
+ v->parent = arg1;
+ value_incref (v->parent);
+ if (!value_lazy (arg1))
+ value_fetch_lazy (v);
}
else if (fieldno < TYPE_N_BASECLASSES (arg_type))
{
/* This field is actually a base subobject, so preserve the
entire object's contents for later references to virtual
bases, etc. */
- v = allocate_value (value_enclosing_type (arg1));
- v->type = type;
+
+ /* Lazy register values with offsets are not supported. */
+ if (VALUE_LVAL (arg1) == lval_register && value_lazy (arg1))
+ value_fetch_lazy (arg1);
+
if (value_lazy (arg1))
- set_value_lazy (v, 1);
+ v = allocate_value_lazy (value_enclosing_type (arg1));
else
- memcpy (value_contents_all_raw (v), value_contents_all_raw (arg1),
- TYPE_LENGTH (value_enclosing_type (arg1)));
+ {
+ v = allocate_value (value_enclosing_type (arg1));
+ memcpy (value_contents_all_raw (v), value_contents_all_raw (arg1),
+ TYPE_LENGTH (value_enclosing_type (arg1)));
+ }
+ v->type = type;
v->offset = value_offset (arg1);
v->embedded_offset = (offset + value_embedded_offset (arg1)
+ TYPE_FIELD_BITPOS (arg_type, fieldno) / 8);
{
/* Plain old data member */
offset += TYPE_FIELD_BITPOS (arg_type, fieldno) / 8;
- v = allocate_value (type);
+
+ /* Lazy register values with offsets are not supported. */
+ if (VALUE_LVAL (arg1) == lval_register && value_lazy (arg1))
+ value_fetch_lazy (arg1);
+
if (value_lazy (arg1))
- set_value_lazy (v, 1);
+ v = allocate_value_lazy (type);
else
- memcpy (value_contents_raw (v),
- value_contents_raw (arg1) + offset,
- TYPE_LENGTH (type));
+ {
+ v = allocate_value (type);
+ memcpy (value_contents_raw (v),
+ value_contents_raw (arg1) + offset,
+ TYPE_LENGTH (type));
+ }
v->offset = (value_offset (arg1) + offset
+ value_embedded_offset (arg1));
}
- VALUE_LVAL (v) = VALUE_LVAL (arg1);
- if (VALUE_LVAL (arg1) == lval_internalvar)
- VALUE_LVAL (v) = lval_internalvar_component;
- v->location = arg1->location;
+ set_value_component_location (v, arg1);
VALUE_REGNUM (v) = VALUE_REGNUM (arg1);
VALUE_FRAME_ID (v) = VALUE_FRAME_ID (arg1);
return v;
*/
struct value *
-value_fn_field (struct value **arg1p, struct fn_field *f, int j, struct type *type,
+value_fn_field (struct value **arg1p, struct fn_field *f,
+ int j, struct type *type,
int offset)
{
struct value *v;
struct symbol *sym;
struct minimal_symbol *msym;
- sym = lookup_symbol (physname, 0, VAR_DOMAIN, 0, NULL);
+ sym = lookup_symbol (physname, 0, VAR_DOMAIN, 0);
if (sym != NULL)
{
msym = NULL;
v = allocate_value (ftype);
if (sym)
{
- VALUE_ADDRESS (v) = BLOCK_START (SYMBOL_BLOCK_VALUE (sym));
+ set_value_address (v, BLOCK_START (SYMBOL_BLOCK_VALUE (sym)));
}
else
{
- VALUE_ADDRESS (v) = SYMBOL_VALUE_ADDRESS (msym);
+ /* The minimal symbol might point to a function descriptor;
+ resolve it to the actual code address instead. */
+ struct objfile *objfile = msymbol_objfile (msym);
+ struct gdbarch *gdbarch = get_objfile_arch (objfile);
+
+ set_value_address (v,
+ gdbarch_convert_from_func_ptr_addr
+ (gdbarch, SYMBOL_VALUE_ADDRESS (msym), ¤t_target));
}
if (arg1p)
}
\f
-/* Unpack a field FIELDNO of the specified TYPE, from the anonymous object at
- VALADDR.
+/* Unpack a bitfield of the specified FIELD_TYPE, from the anonymous
+ object at VALADDR. The bitfield starts at BITPOS bits and contains
+ BITSIZE bits.
Extracting bits depends on endianness of the machine. Compute the
number of least significant bits to discard. For big endian machines,
If the field is signed, we also do sign extension. */
LONGEST
-unpack_field_as_long (struct type *type, const gdb_byte *valaddr, int fieldno)
+unpack_bits_as_long (struct type *field_type, const gdb_byte *valaddr,
+ int bitpos, int bitsize)
{
+ enum bfd_endian byte_order = gdbarch_byte_order (get_type_arch (field_type));
ULONGEST val;
ULONGEST valmask;
- int bitpos = TYPE_FIELD_BITPOS (type, fieldno);
- int bitsize = TYPE_FIELD_BITSIZE (type, fieldno);
int lsbcount;
- struct type *field_type;
+ int bytes_read;
- val = extract_unsigned_integer (valaddr + bitpos / 8, sizeof (val));
- field_type = TYPE_FIELD_TYPE (type, fieldno);
+ /* Read the minimum number of bytes required; there may not be
+ enough bytes to read an entire ULONGEST. */
CHECK_TYPEDEF (field_type);
+ if (bitsize)
+ bytes_read = ((bitpos % 8) + bitsize + 7) / 8;
+ else
+ bytes_read = TYPE_LENGTH (field_type);
+
+ val = extract_unsigned_integer (valaddr + bitpos / 8,
+ bytes_read, byte_order);
/* Extract bits. See comment above. */
- if (BITS_BIG_ENDIAN)
- lsbcount = (sizeof val * 8 - bitpos % 8 - bitsize);
+ if (gdbarch_bits_big_endian (get_type_arch (field_type)))
+ lsbcount = (bytes_read * 8 - bitpos % 8 - bitsize);
else
lsbcount = (bitpos % 8);
val >>= lsbcount;
return (val);
}
+/* Unpack a field FIELDNO of the specified TYPE, from the anonymous object at
+ VALADDR. See unpack_bits_as_long for more details. */
+
+LONGEST
+unpack_field_as_long (struct type *type, const gdb_byte *valaddr, int fieldno)
+{
+ int bitpos = TYPE_FIELD_BITPOS (type, fieldno);
+ int bitsize = TYPE_FIELD_BITSIZE (type, fieldno);
+ struct type *field_type = TYPE_FIELD_TYPE (type, fieldno);
+
+ return unpack_bits_as_long (field_type, valaddr, bitpos, bitsize);
+}
+
/* Modify the value of a bitfield. ADDR points to a block of memory in
target byte order; the bitfield starts in the byte pointed to. FIELDVAL
is the desired value of the field, in host byte order. BITPOS and BITSIZE
indicate which bits (in target bit order) comprise the bitfield.
- Requires 0 < BITSIZE <= lbits, 0 <= BITPOS+BITSIZE <= lbits, and
+ Requires 0 < BITSIZE <= lbits, 0 <= BITPOS % 8 + BITSIZE <= lbits, and
0 <= BITPOS, where lbits is the size of a LONGEST in bits. */
void
-modify_field (gdb_byte *addr, LONGEST fieldval, int bitpos, int bitsize)
+modify_field (struct type *type, gdb_byte *addr,
+ LONGEST fieldval, int bitpos, int bitsize)
{
+ enum bfd_endian byte_order = gdbarch_byte_order (get_type_arch (type));
ULONGEST oword;
ULONGEST mask = (ULONGEST) -1 >> (8 * sizeof (ULONGEST) - bitsize);
+ int bytesize;
+
+ /* Normalize BITPOS. */
+ addr += bitpos / 8;
+ bitpos %= 8;
/* If a negative fieldval fits in the field in question, chop
off the sign extension bits. */
fieldval &= mask;
}
- oword = extract_unsigned_integer (addr, sizeof oword);
+ /* Ensure no bytes outside of the modified ones get accessed as it may cause
+ false valgrind reports. */
+
+ bytesize = (bitpos + bitsize + 7) / 8;
+ oword = extract_unsigned_integer (addr, bytesize, byte_order);
/* Shifting for bit field depends on endianness of the target machine. */
- if (BITS_BIG_ENDIAN)
- bitpos = sizeof (oword) * 8 - bitpos - bitsize;
+ if (gdbarch_bits_big_endian (get_type_arch (type)))
+ bitpos = bytesize * 8 - bitpos - bitsize;
oword &= ~(mask << bitpos);
oword |= fieldval << bitpos;
- store_unsigned_integer (addr, sizeof oword, oword);
+ store_unsigned_integer (addr, bytesize, byte_order, oword);
}
\f
/* Pack NUM into BUF using a target format of TYPE. */
void
pack_long (gdb_byte *buf, struct type *type, LONGEST num)
{
+ enum bfd_endian byte_order = gdbarch_byte_order (get_type_arch (type));
int len;
type = check_typedef (type);
case TYPE_CODE_BOOL:
case TYPE_CODE_RANGE:
case TYPE_CODE_MEMBERPTR:
- store_signed_integer (buf, len, num);
+ store_signed_integer (buf, len, byte_order, num);
break;
case TYPE_CODE_REF:
}
+/* Pack NUM into BUF using a target format of TYPE. */
+
+void
+pack_unsigned_long (gdb_byte *buf, struct type *type, ULONGEST num)
+{
+ int len;
+ enum bfd_endian byte_order;
+
+ type = check_typedef (type);
+ len = TYPE_LENGTH (type);
+ byte_order = gdbarch_byte_order (get_type_arch (type));
+
+ switch (TYPE_CODE (type))
+ {
+ case TYPE_CODE_INT:
+ case TYPE_CODE_CHAR:
+ case TYPE_CODE_ENUM:
+ case TYPE_CODE_FLAGS:
+ case TYPE_CODE_BOOL:
+ case TYPE_CODE_RANGE:
+ case TYPE_CODE_MEMBERPTR:
+ store_unsigned_integer (buf, len, byte_order, num);
+ break;
+
+ case TYPE_CODE_REF:
+ case TYPE_CODE_PTR:
+ store_typed_address (buf, type, (CORE_ADDR) num);
+ break;
+
+ default:
+ error (_("Unexpected type (%d) encountered "
+ "for unsigned integer constant."),
+ TYPE_CODE (type));
+ }
+}
+
+
/* Convert C numbers into newly allocated values. */
struct value *
struct value *val = allocate_value (type);
pack_long (value_contents_raw (val), type, num);
+ return val;
+}
+
+
+/* Convert C unsigned numbers into newly allocated values. */
+
+struct value *
+value_from_ulongest (struct type *type, ULONGEST num)
+{
+ struct value *val = allocate_value (type);
+
+ pack_unsigned_long (value_contents_raw (val), type, num);
return val;
}
value_from_pointer (struct type *type, CORE_ADDR addr)
{
struct value *val = allocate_value (type);
- store_typed_address (value_contents_raw (val), type, addr);
+
+ store_typed_address (value_contents_raw (val), check_typedef (type), addr);
return val;
}
-/* Create a value for a string constant to be stored locally
- (not in the inferior's memory space, but in GDB memory).
- This is analogous to value_from_longest, which also does not
- use inferior memory. String shall NOT contain embedded nulls. */
+/* Create a value of type TYPE whose contents come from VALADDR, if it
+ is non-null, and whose memory address (in the inferior) is
+ ADDRESS. */
struct value *
-value_from_string (char *ptr)
+value_from_contents_and_address (struct type *type,
+ const gdb_byte *valaddr,
+ CORE_ADDR address)
{
- struct value *val;
- int len = strlen (ptr);
- int lowbound = current_language->string_lower_bound;
- struct type *string_char_type;
- struct type *rangetype;
- struct type *stringtype;
-
- rangetype = create_range_type ((struct type *) NULL,
- builtin_type_int,
- lowbound, len + lowbound - 1);
- string_char_type = language_string_char_type (current_language,
- current_gdbarch);
- stringtype = create_array_type ((struct type *) NULL,
- string_char_type,
- rangetype);
- val = allocate_value (stringtype);
- memcpy (value_contents_raw (val), ptr, len);
- return val;
+ struct value *v = allocate_value (type);
+
+ if (valaddr == NULL)
+ set_value_lazy (v, 1);
+ else
+ memcpy (value_contents_raw (v), valaddr, TYPE_LENGTH (type));
+ set_value_address (v, address);
+ VALUE_LVAL (v) = lval_memory;
+ return v;
}
struct value *
struct value *val = allocate_value (type);
struct type *base_type = check_typedef (type);
enum type_code code = TYPE_CODE (base_type);
- int len = TYPE_LENGTH (base_type);
if (code == TYPE_CODE_FLT)
{
}
struct value *
-value_from_decfloat (struct type *expect_type, struct type *type,
- gdb_byte decbytes[16])
+value_from_decfloat (struct type *type, const gdb_byte *dec)
{
struct value *val = allocate_value (type);
- int len = TYPE_LENGTH (type);
-
- if (expect_type)
- {
- int expect_len = TYPE_LENGTH (expect_type);
- char decstr[MAX_DECIMAL_STRING];
- int real_len;
-
- decimal_to_string (decbytes, len, decstr);
- decimal_from_string (decbytes, expect_len, decstr);
- }
- memcpy (value_contents_raw (val), decbytes, len);
+ memcpy (value_contents_raw (val), dec, TYPE_LENGTH (type));
return val;
}
coerce_ref (struct value *arg)
{
struct type *value_type_arg_tmp = check_typedef (value_type (arg));
+
if (TYPE_CODE (value_type_arg_tmp) == TYPE_CODE_REF)
arg = value_at_lazy (TYPE_TARGET_TYPE (value_type_arg_tmp),
unpack_pointer (value_type (arg),
struct value *
coerce_array (struct value *arg)
{
- arg = coerce_ref (arg);
- if (current_language->c_style_arrays
- && TYPE_CODE (value_type (arg)) == TYPE_CODE_ARRAY)
- arg = value_coerce_array (arg);
- if (TYPE_CODE (value_type (arg)) == TYPE_CODE_FUNC)
- arg = value_coerce_function (arg);
- return arg;
-}
+ struct type *type;
-struct value *
-coerce_number (struct value *arg)
-{
- arg = coerce_array (arg);
- arg = coerce_enum (arg);
- return arg;
-}
+ arg = coerce_ref (arg);
+ type = check_typedef (value_type (arg));
-struct value *
-coerce_enum (struct value *arg)
-{
- if (TYPE_CODE (check_typedef (value_type (arg))) == TYPE_CODE_ENUM)
- arg = value_cast (builtin_type_unsigned_int, arg);
+ switch (TYPE_CODE (type))
+ {
+ case TYPE_CODE_ARRAY:
+ if (!TYPE_VECTOR (type) && current_language->c_style_arrays)
+ arg = value_coerce_array (arg);
+ break;
+ case TYPE_CODE_FUNC:
+ arg = value_coerce_function (arg);
+ break;
+ }
return arg;
}
\f
address as a hidden first parameter). */
int
-using_struct_return (struct type *value_type)
+using_struct_return (struct gdbarch *gdbarch,
+ struct type *func_type, struct type *value_type)
{
enum type_code code = TYPE_CODE (value_type);
return 0;
/* Probe the architecture for the return-value convention. */
- return (gdbarch_return_value (current_gdbarch, value_type,
+ return (gdbarch_return_value (gdbarch, func_type, value_type,
NULL, NULL, NULL)
!= RETURN_VALUE_REGISTER_CONVENTION);
}
\"$__\" holds the contents of the last address examined with \"x\"."),
&showlist);
- add_cmd ("values", no_class, show_values,
- _("Elements of value history around item number IDX (or last ten)."),
+ add_cmd ("values", no_class, show_values, _("\
+Elements of value history around item number IDX (or last ten)."),
&showlist);
add_com ("init-if-undefined", class_vars, init_if_undefined_command, _("\
Set an internal VARIABLE to the result of the EXPRESSION if it does not\n\
exist or does not contain a value. The EXPRESSION is not evaluated if the\n\
VARIABLE is already initialized."));
+
+ add_prefix_cmd ("function", no_class, function_command, _("\
+Placeholder command for showing help on convenience functions."),
+ &functionlist, "function ", 0, &cmdlist);
}
projects / deliverable / binutils-gdb.git / blobdiff