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Merge pull request #6447 from edolstra/eval-cache-symbols

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EvalCache: Use Symbol in more places
This commit is contained in:
Eelco Dolstra 2022-04-26 15:41:40 +02:00 committed by GitHub
commit a81622c21d
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GPG key ID: 4AEE18F83AFDEB23
7 changed files with 71 additions and 50 deletions
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2
src/libcmd/installables.cc
View file

@ -600,7 +600,7 @@ std::tuple<std::string, FlakeRef, InstallableValue::DerivationInfo> InstallableF
auto drvInfo = DerivationInfo {
std::move(drvPath),
attr->getAttr("outputName")->getString()
attr->getAttr(state->sOutputName)->getString()
};
return {attrPath, getLockedFlake()->flake.lockedRef, std::move(drvInfo)};

97
src/libexpr/eval-cache.cc
View file

@ -35,9 +35,15 @@ struct AttrDb
std::unique_ptr<Sync<State>> _state;
AttrDb(const Store & cfg, const Hash & fingerprint)
SymbolTable & symbols;
AttrDb(
const Store & cfg,
const Hash & fingerprint,
SymbolTable & symbols)
: cfg(cfg)
, _state(std::make_unique<Sync<State>>())
, symbols(symbols)
{
auto state(_state->lock());
@ -92,7 +98,6 @@ struct AttrDb
AttrId setAttrs(
AttrKey key,
const SymbolTable & symbols,
const std::vector<Symbol> & attrs)
{
return doSQLite([&]()
@ -101,7 +106,7 @@ struct AttrDb
state->insertAttribute.use()
(key.first)
(key.second)
(symbols[key.second])
(AttrType::FullAttrs)
(0, false).exec();
@ -136,14 +141,14 @@ struct AttrDb
}
state->insertAttributeWithContext.use()
(key.first)
(key.second)
(symbols[key.second])
(AttrType::String)
(s)
(ctx).exec();
} else {
state->insertAttribute.use()
(key.first)
(key.second)
(symbols[key.second])
(AttrType::String)
(s).exec();
}
@ -162,7 +167,7 @@ struct AttrDb
state->insertAttribute.use()
(key.first)
(key.second)
(symbols[key.second])
(AttrType::Bool)
(b ? 1 : 0).exec();
@ -178,7 +183,7 @@ struct AttrDb
state->insertAttribute.use()
(key.first)
(key.second)
(symbols[key.second])
(AttrType::Placeholder)
(0, false).exec();
@ -194,7 +199,7 @@ struct AttrDb
state->insertAttribute.use()
(key.first)
(key.second)
(symbols[key.second])
(AttrType::Missing)
(0, false).exec();
@ -210,7 +215,7 @@ struct AttrDb
state->insertAttribute.use()
(key.first)
(key.second)
(symbols[key.second])
(AttrType::Misc)
(0, false).exec();
@ -226,7 +231,7 @@ struct AttrDb
state->insertAttribute.use()
(key.first)
(key.second)
(symbols[key.second])
(AttrType::Failed)
(0, false).exec();
@ -234,13 +239,11 @@ struct AttrDb
});
}
std::optional<std::pair<AttrId, AttrValue>> getAttr(
AttrKey key,
SymbolTable & symbols)
std::optional<std::pair<AttrId, AttrValue>> getAttr(AttrKey key)
{
auto state(_state->lock());
auto queryAttribute(state->queryAttribute.use()(key.first)(key.second));
auto queryAttribute(state->queryAttribute.use()(key.first)(symbols[key.second]));
if (!queryAttribute.next()) return {};
auto rowId = (AttrType) queryAttribute.getInt(0);
@ -278,10 +281,13 @@ struct AttrDb
}
};
static std::shared_ptr<AttrDb> makeAttrDb(const Store & cfg, const Hash & fingerprint)
static std::shared_ptr<AttrDb> makeAttrDb(
const Store & cfg,
const Hash & fingerprint,
SymbolTable & symbols)
{
try {
return std::make_shared<AttrDb>(cfg, fingerprint);
return std::make_shared<AttrDb>(cfg, fingerprint, symbols);
} catch (SQLiteError &) {
ignoreException();
return nullptr;
@ -292,7 +298,7 @@ EvalCache::EvalCache(
std::optional<std::reference_wrapper<const Hash>> useCache,
EvalState & state,
RootLoader rootLoader)
: db(useCache ? makeAttrDb(*state.store, *useCache) : nullptr)
: db(useCache ? makeAttrDb(*state.store, *useCache, state.symbols) : nullptr)
, state(state)
, rootLoader(rootLoader)
{
@ -326,13 +332,12 @@ AttrCursor::AttrCursor(
AttrKey AttrCursor::getKey()
{
if (!parent)
return {0, {""}};
return {0, root->state.sEpsilon};
if (!parent->first->cachedValue) {
parent->first->cachedValue = root->db->getAttr(
parent->first->getKey(), root->state.symbols);
parent->first->cachedValue = root->db->getAttr(parent->first->getKey());
assert(parent->first->cachedValue);
}
return {parent->first->cachedValue->first, root->state.symbols[parent->second]};
return {parent->first->cachedValue->first, parent->second};
}
Value & AttrCursor::getValue()
@ -420,20 +425,20 @@ Suggestions AttrCursor::getSuggestionsForAttr(Symbol name)
return Suggestions::bestMatches(strAttrNames, root->state.symbols[name]);
}
std::shared_ptr<AttrCursor> AttrCursor::maybeGetAttr(std::string_view name, bool forceErrors)
std::shared_ptr<AttrCursor> AttrCursor::maybeGetAttr(Symbol name, bool forceErrors)
{
if (root->db) {
if (!cachedValue)
cachedValue = root->db->getAttr(getKey(), root->state.symbols);
cachedValue = root->db->getAttr(getKey());
if (cachedValue) {
if (auto attrs = std::get_if<std::vector<Symbol>>(&cachedValue->second)) {
for (auto & attr : *attrs)
if (root->state.symbols[attr] == name)
if (attr == name)
return std::make_shared<AttrCursor>(root, std::make_pair(shared_from_this(), attr));
return nullptr;
} else if (std::get_if<placeholder_t>(&cachedValue->second)) {
auto attr = root->db->getAttr({cachedValue->first, std::string(name)}, root->state.symbols);
auto attr = root->db->getAttr({cachedValue->first, name});
if (attr) {
if (std::get_if<missing_t>(&attr->second))
return nullptr;
@ -441,10 +446,10 @@ std::shared_ptr<AttrCursor> AttrCursor::maybeGetAttr(std::string_view name, bool
if (forceErrors)
debug("reevaluating failed cached attribute '%s'");
else
throw CachedEvalError("cached failure of attribute '%s'", getAttrPathStr(root->state.symbols.create(name)));
throw CachedEvalError("cached failure of attribute '%s'", getAttrPathStr(name));
} else
return std::make_shared<AttrCursor>(root,
std::make_pair(shared_from_this(), root->state.symbols.create(name)), nullptr, std::move(attr));
std::make_pair(shared_from_this(), name), nullptr, std::move(attr));
}
// Incomplete attrset, so need to fall thru and
// evaluate to see whether 'name' exists
@ -462,16 +467,16 @@ std::shared_ptr<AttrCursor> AttrCursor::maybeGetAttr(std::string_view name, bool
for (auto & attr : *v.attrs) {
if (root->db)
root->db->setPlaceholder({cachedValue->first, root->state.symbols[attr.name]});
root->db->setPlaceholder({cachedValue->first, attr.name});
}
auto attr = v.attrs->get(root->state.symbols.create(name));
auto attr = v.attrs->get(name);
if (!attr) {
if (root->db) {
if (!cachedValue)
cachedValue = {root->db->setPlaceholder(getKey()), placeholder_t()};
root->db->setMissing({cachedValue->first, std::string(name)});
root->db->setMissing({cachedValue->first, name});
}
return nullptr;
}
@ -480,26 +485,36 @@ std::shared_ptr<AttrCursor> AttrCursor::maybeGetAttr(std::string_view name, bool
if (root->db) {
if (!cachedValue)
cachedValue = {root->db->setPlaceholder(getKey()), placeholder_t()};
cachedValue2 = {root->db->setPlaceholder({cachedValue->first, std::string(name)}), placeholder_t()};
cachedValue2 = {root->db->setPlaceholder({cachedValue->first, name}), placeholder_t()};
}
return make_ref<AttrCursor>(
root, std::make_pair(shared_from_this(), root->state.symbols.create(name)), attr->value, std::move(cachedValue2));
root, std::make_pair(shared_from_this(), name), attr->value, std::move(cachedValue2));
}
ref<AttrCursor> AttrCursor::getAttr(std::string_view name, bool forceErrors)
std::shared_ptr<AttrCursor> AttrCursor::maybeGetAttr(std::string_view name)
{
return maybeGetAttr(root->state.symbols.create(name));
}
ref<AttrCursor> AttrCursor::getAttr(Symbol name, bool forceErrors)
{
auto p = maybeGetAttr(name, forceErrors);
if (!p)
throw Error("attribute '%s' does not exist", getAttrPathStr(root->state.symbols.create(name)));
throw Error("attribute '%s' does not exist", getAttrPathStr(name));
return ref(p);
}
ref<AttrCursor> AttrCursor::getAttr(std::string_view name)
{
return getAttr(root->state.symbols.create(name));
}
OrSuggestions<ref<AttrCursor>> AttrCursor::findAlongAttrPath(const std::vector<Symbol> & attrPath, bool force)
{
auto res = shared_from_this();
for (auto & attr : attrPath) {
auto child = res->maybeGetAttr(root->state.symbols[attr], force);
auto child = res->maybeGetAttr(attr, force);
if (!child) {
auto suggestions = res->getSuggestionsForAttr(attr);
return OrSuggestions<ref<AttrCursor>>::failed(suggestions);
@ -513,7 +528,7 @@ std::string AttrCursor::getString()
{
if (root->db) {
if (!cachedValue)
cachedValue = root->db->getAttr(getKey(), root->state.symbols);
cachedValue = root->db->getAttr(getKey());
if (cachedValue && !std::get_if<placeholder_t>(&cachedValue->second)) {
if (auto s = std::get_if<string_t>(&cachedValue->second)) {
debug("using cached string attribute '%s'", getAttrPathStr());
@ -535,7 +550,7 @@ string_t AttrCursor::getStringWithContext()
{
if (root->db) {
if (!cachedValue)
cachedValue = root->db->getAttr(getKey(), root->state.symbols);
cachedValue = root->db->getAttr(getKey());
if (cachedValue && !std::get_if<placeholder_t>(&cachedValue->second)) {
if (auto s = std::get_if<string_t>(&cachedValue->second)) {
bool valid = true;
@ -568,7 +583,7 @@ bool AttrCursor::getBool()
{
if (root->db) {
if (!cachedValue)
cachedValue = root->db->getAttr(getKey(), root->state.symbols);
cachedValue = root->db->getAttr(getKey());
if (cachedValue && !std::get_if<placeholder_t>(&cachedValue->second)) {
if (auto b = std::get_if<bool>(&cachedValue->second)) {
debug("using cached Boolean attribute '%s'", getAttrPathStr());
@ -590,7 +605,7 @@ std::vector<Symbol> AttrCursor::getAttrs()
{
if (root->db) {
if (!cachedValue)
cachedValue = root->db->getAttr(getKey(), root->state.symbols);
cachedValue = root->db->getAttr(getKey());
if (cachedValue && !std::get_if<placeholder_t>(&cachedValue->second)) {
if (auto attrs = std::get_if<std::vector<Symbol>>(&cachedValue->second)) {
debug("using cached attrset attribute '%s'", getAttrPathStr());
@ -614,7 +629,7 @@ std::vector<Symbol> AttrCursor::getAttrs()
});
if (root->db)
cachedValue = {root->db->setAttrs(getKey(), root->state.symbols, attrs), attrs};
cachedValue = {root->db->setAttrs(getKey(), attrs), attrs};
return attrs;
}
@ -627,7 +642,7 @@ bool AttrCursor::isDerivation()
StorePath AttrCursor::forceDerivation()
{
auto aDrvPath = getAttr("drvPath", true);
auto aDrvPath = getAttr(root->state.sDrvPath, true);
auto drvPath = root->state.store->parseStorePath(aDrvPath->getString());
if (!root->state.store->isValidPath(drvPath) && !settings.readOnlyMode) {
/* The eval cache contains 'drvPath', but the actual path has

10
src/libexpr/eval-cache.hh
View file

@ -51,7 +51,7 @@ struct missing_t {};
struct misc_t {};
struct failed_t {};
typedef uint64_t AttrId;
typedef std::pair<AttrId, std::string> AttrKey;
typedef std::pair<AttrId, Symbol> AttrKey;
typedef std::pair<std::string, NixStringContext> string_t;
typedef std::variant<
@ -96,9 +96,13 @@ public:
Suggestions getSuggestionsForAttr(Symbol name);
std::shared_ptr<AttrCursor> maybeGetAttr(std::string_view name, bool forceErrors = false);
std::shared_ptr<AttrCursor> maybeGetAttr(Symbol name, bool forceErrors = false);
ref<AttrCursor> getAttr(std::string_view name, bool forceErrors = false);
std::shared_ptr<AttrCursor> maybeGetAttr(std::string_view name);
ref<AttrCursor> getAttr(Symbol name, bool forceErrors = false);
ref<AttrCursor> getAttr(std::string_view name);
/* Get an attribute along a chain of attrsets. Note that this does
not auto-call functors or functions. */

2
src/libexpr/symbol-table.hh
View file

@ -72,12 +72,14 @@ private:
ChunkedVector<std::string, 8192> store{16};
public:
Symbol create(std::string_view s)
{
// Most symbols are looked up more than once, so we trade off insertion performance
// for lookup performance.
// TODO: could probably be done more efficiently with transparent Hash and Equals
// on the original implementation using unordered_set
// FIXME: make this thread-safe.
auto it = symbols.find(s);
if (it != symbols.end()) return Symbol(it->second.second + 1);

6
src/nix/app.cc
View file

@ -85,9 +85,9 @@ UnresolvedApp Installable::toApp(EvalState & state)
else if (type == "derivation") {
auto drvPath = cursor->forceDerivation();
auto outPath = cursor->getAttr("outPath")->getString();
auto outputName = cursor->getAttr("outputName")->getString();
auto name = cursor->getAttr("name")->getString();
auto outPath = cursor->getAttr(state.sOutPath)->getString();
auto outputName = cursor->getAttr(state.sOutputName)->getString();
auto name = cursor->getAttr(state.sName)->getString();
auto aPname = cursor->maybeGetAttr("pname");
auto aMeta = cursor->maybeGetAttr("meta");
auto aMainProgram = aMeta ? aMeta->maybeGetAttr("mainProgram") : nullptr;

2
src/nix/flake.cc
View file

@ -1012,7 +1012,7 @@ struct CmdFlakeShow : FlakeCommand, MixJSON
auto showDerivation = [&]()
{
auto name = visitor.getAttr("name")->getString();
auto name = visitor.getAttr(state->sName)->getString();
if (json) {
std::optional<std::string> description;
if (auto aMeta = visitor.maybeGetAttr("meta")) {

2
src/nix/search.cc
View file

@ -156,7 +156,7 @@ struct CmdSearch : InstallableCommand, MixJSON
recurse();
else if (attrPathS[0] == "legacyPackages" && attrPath.size() > 2) {
auto attr = cursor.maybeGetAttr("recurseForDerivations");
auto attr = cursor.maybeGetAttr(state->sRecurseForDerivations);
if (attr && attr->getBool())
recurse();
}