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Move SHAMap hash computations from dirtyUp to walkSubTree

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in order to reduce the total number of hash computations.
This commit is contained in:
Howard Hinnant
2015-03-06 18:36:44 -05:00
committed by Tom Ritchford
parent 0083c32629
commit 698fe73608
4 changed files with 41 additions and 60 deletions
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53
src/ripple/shamap/impl/SHAMap.cpp
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@@ -137,14 +137,7 @@ SHAMap::dirtyUp (SharedPtrNodeStack& stack,
assert (branch >= 0);
unshareNode (node, nodeID);
if (! node->setChild (branch, child->getNodeHash(), child))
{
journal_.fatal <<
"dirtyUp terminates early";
assert (false);
return;
}
node->setChild (branch, child);
#ifdef ST_DEBUG
if (journal_.trace) journal_.trace <<
@@ -701,11 +694,7 @@ bool SHAMap::delItem (uint256 const& id)
assert (node->isInner ());
unshareNode (node, nodeID);
if (! node->setChild (nodeID.selectBranch (id), prevHash, prevNode))
{
assert (false);
return true;
}
node->setChild (nodeID.selectBranch (id), prevNode);
if (!nodeID.isRoot ())
{
@@ -730,10 +719,7 @@ bool SHAMap::delItem (uint256 const& id)
{
if (!node->isEmptyBranch (i))
{
if (! node->setChild (i, uint256(), nullptr))
{
assert (false);
}
node->setChild (i, nullptr);
break;
}
}
@@ -742,14 +728,12 @@ bool SHAMap::delItem (uint256 const& id)
prevHash = node->getNodeHash ();
prevNode = std::move (node);
assert (prevHash.isNonZero ());
}
else
{
// This node is now the end of the branch
prevHash = node->getNodeHash ();
prevNode = std::move (node);
assert (prevHash.isNonZero ());
}
}
}
@@ -787,10 +771,7 @@ SHAMap::addGiveItem (std::shared_ptr<SHAMapItem> const& item,
int branch = nodeID.selectBranch (tag);
assert (node->isEmptyBranch (branch));
auto newNode = std::make_shared<SHAMapTreeNode> (item, type, seq_);
if (! node->setChild (branch, newNode->getNodeHash (), newNode))
{
assert (false);
}
node->setChild (branch, newNode);
}
else
{
@@ -819,17 +800,11 @@ SHAMap::addGiveItem (std::shared_ptr<SHAMapItem> const& item,
std::shared_ptr<SHAMapTreeNode> newNode =
std::make_shared<SHAMapTreeNode> (item, type, seq_);
assert (newNode->isValid () && newNode->isLeaf ());
if (!node->setChild (b1, newNode->getNodeHash (), newNode))
{
assert (false);
}
node->setChild (b1, newNode);
newNode = std::make_shared<SHAMapTreeNode> (otherItem, type, seq_);
assert (newNode->isValid () && newNode->isLeaf ());
if (!node->setChild (b2, newNode->getNodeHash (), newNode))
{
assert (false);
}
node->setChild (b2, newNode);
}
dirtyUp (stack, tag, node);
@@ -841,6 +816,18 @@ bool SHAMap::addItem (const SHAMapItem& i, bool isTransaction, bool hasMetaData)
return addGiveItem (std::make_shared<SHAMapItem> (i), isTransaction, hasMetaData);
}
uint256
SHAMap::getHash () const
{
auto hash = root_->getNodeHash();
if (hash.isZero())
{
const_cast<SHAMap&>(*this).unshare();
hash = root_->getNodeHash();
}
return hash;
}
bool
SHAMap::updateGiveItem (std::shared_ptr<SHAMapItem> const& item,
bool isTransaction, bool hasMeta)
@@ -1034,6 +1021,7 @@ SHAMap::walkSubTree (bool doWrite, NodeObjectType t, std::uint32_t seq)
preFlushNode (child);
assert (node->getSeq() == seq_);
child->updateHash();
if (doWrite && backed_)
writeNode (t, seq, child);
@@ -1044,6 +1032,9 @@ SHAMap::walkSubTree (bool doWrite, NodeObjectType t, std::uint32_t seq)
}
}
// update the hash of this inner node
node->updateHashDeep();
// This inner node can now be shared
if (doWrite && backed_)
writeNode (t, seq, node);