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* value.c (struct value): Add reference_count field.
	(allocate_value_lazy): Initialize reference_count.
	(value_incref): New function.
	(value_free): Check the reference count.
	* value.h (value_incref): New prototype.
This commit is contained in:
Daniel Jacobowitz 2009-07-21 18:12:40 +00:00
parent 711eedefee
commit 828d3400fb
3 changed files with 39 additions and 0 deletions
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8
gdb/ChangeLog
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@ -1,3 +1,11 @@
2009-07-21 Daniel Jacobowitz <dan@codesourcery.com>
* value.c (struct value): Add reference_count field.
(allocate_value_lazy): Initialize reference_count.
(value_incref): New function.
(value_free): Check the reference count.
* value.h (value_incref): New prototype.
2009-07-20 Marc Khouzam <marc.khouzam@ericsson.com>
* utils.c (defaulted_query): Update comment and remove dead code.

29
gdb/value.c
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@ -194,6 +194,13 @@ struct value
/* 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. */
@ -259,6 +266,10 @@ allocate_value_lazy (struct type *type)
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;
}
@ -583,11 +594,29 @@ value_mark (void)
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 (VALUE_LVAL (val) == lval_computed)
{
struct lval_funcs *funcs = val->location.computed.funcs;

2
gdb/value.h
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@ -582,6 +582,8 @@ extern int unop_user_defined_p (enum exp_opcode op, struct value *arg1);
extern int destructor_name_p (const char *name, const struct type *type);
extern void value_incref (struct value *val);
extern void value_free (struct value *val);
extern void free_all_values (void);