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Add lval_funcs::is_optimized_out

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This adds an is_optimized_out function pointer to lval_funcs, and
changes value_optimized_out to call it.  This new function lets gdb
determine if a value is optimized out without necessarily fetching the
value.  This is needed for a subsequent patch, where an attempt to
access a lazy value would fail due to the value size limit -- however,
the access was only needed to determine the optimized-out state.
This commit is contained in:
Tom Tromey
2021-09-10 12:40:54 -06:00
parent 25b0a5714c
commit a519e8ffe2
5 changed files with 66 additions and 15 deletions
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17
gdb/value.c
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@ -1407,10 +1407,21 @@ value_contents_writeable (struct value *value)
int
value_optimized_out (struct value *value)
{
/* We can only know if a value is optimized out once we have tried to
fetch it. */
if (value->optimized_out.empty () && value->lazy)
if (value->lazy)
{
/* See if we can compute the result without fetching the
value. */
if (VALUE_LVAL (value) == lval_memory)
return false;
else if (VALUE_LVAL (value) == lval_computed)
{
const struct lval_funcs *funcs = value->location.computed.funcs;
if (funcs->is_optimized_out != nullptr)
return funcs->is_optimized_out (value);
}
/* Fall back to fetching. */
try
{
value_fetch_lazy (value);