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fix bug in insert_at

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This commit is contained in:
Joe Thornber 2011-08-22 14:09:37 +01:00
parent 4d37416075
commit d9e99dc00c
1 changed files with 11 additions and 5 deletions
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16
btree.tcc
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@ -10,8 +10,9 @@ using namespace std;
//----------------------------------------------------------------
template <typename ValueTraits, uint32_t BlockSize>
node_ref<ValueTraits, BlockSize>::node_ref(disk_node *raw)
: raw_(raw)
node_ref<ValueTraits, BlockSize>::node_ref(block_address location, disk_node *raw)
: location_(location),
raw_(raw)
{
}
@ -84,6 +85,8 @@ template <typename ValueTraits, uint32_t BlockSize>
uint64_t
node_ref<ValueTraits, BlockSize>::key_at(unsigned i) const
{
if (i >= get_nr_entries())
throw runtime_error("key index out of bounds");
return to_cpu<uint64_t>(raw_->keys[i]);
}
@ -98,6 +101,9 @@ template <typename ValueTraits, uint32_t BlockSize>
typename ValueTraits::value_type
node_ref<ValueTraits, BlockSize>::value_at(unsigned i) const
{
if (i >= get_nr_entries())
throw runtime_error("value index out of bounds");
// We have to copy because of alignment issues.
typename ValueTraits::disk_type d;
::memcpy(&d, value_ptr(i), sizeof(d));
@ -128,8 +134,8 @@ node_ref<ValueTraits, BlockSize>::insert_at(unsigned i,
throw runtime_error("too many entries");
set_nr_entries(n + 1);
::memmove(key_ptr(i + 1), key_ptr(i), sizeof(uint64_t));
::memmove(value_ptr(i + 1), value_ptr(i), sizeof(typename ValueTraits::disk_type));
::memmove(key_ptr(i + 1), key_ptr(i), sizeof(uint64_t) * (n - i));
::memmove(value_ptr(i + 1), value_ptr(i), sizeof(typename ValueTraits::disk_type) * (n - i));
overwrite_at(i, key, v);
}
@ -581,7 +587,7 @@ insert_location(btree_detail::shadow_spine<BlockSize> &spine,
// do decrement the old value if it already exists
// FIXME: I'm not sure about this, I don't understand the |inc| reference
if (leaf.key_at(i) == key && inc) {
if (static_cast<unsigned>(i) < leaf.get_nr_entries() && leaf.key_at(i) == key && inc) {
// dec old entry
}
*index = i;