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libexpr: factor out functions for moving data to a new allocator

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This commit is contained in:
Taeer Bar-Yam 2025-11-24 20:23:10 +01:00
parent 5d066386b5
commit 43a183120a
2 changed files with 20 additions and 16 deletions
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2
src/libexpr/include/nix/expr/nixexpr.hh
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@ -438,6 +438,7 @@ struct ExprAttrs : Expr
std::shared_ptr<const StaticEnv> bindInheritSources(EvalState & es, const std::shared_ptr<const StaticEnv> & env);
Env * buildInheritFromEnv(EvalState & state, Env & up);
void showBindings(const SymbolTable & symbols, std::ostream & str) const;
void moveDataToAllocator(std::pmr::polymorphic_allocator<char> & alloc);
};
struct ExprList : Expr
@ -622,6 +623,7 @@ struct ExprCall : Expr
virtual void resetCursedOr() override;
virtual void warnIfCursedOr(const SymbolTable & symbols, const PosTable & positions) override;
void moveDataToAllocator(std::pmr::polymorphic_allocator<char> & alloc);
COMMON_METHODS
};

34
src/libexpr/nixexpr.cc
View file

@ -399,18 +399,19 @@ ExprAttrs::bindInheritSources(EvalState & es, const std::shared_ptr<const Static
return inner;
}
void ExprAttrs::moveDataToAllocator(std::pmr::polymorphic_allocator<char> & alloc)
{
AttrDefs newAttrs{std::move(*attrs), alloc};
attrs.emplace(std::move(newAttrs), alloc);
DynamicAttrDefs newDynamicAttrs{std::move(*dynamicAttrs), alloc};
dynamicAttrs.emplace(std::move(newDynamicAttrs), alloc);
if (inheritFromExprs)
inheritFromExprs = std::make_unique<std::pmr::vector<Expr *>>(std::move(*inheritFromExprs), alloc);
}
void ExprAttrs::bindVars(EvalState & es, const std::shared_ptr<const StaticEnv> & env)
{
// Move storage into the Exprs arena
{
auto arena = es.mem.exprs.alloc;
AttrDefs newAttrs{std::move(*attrs), arena};
attrs.emplace(std::move(newAttrs), arena);
DynamicAttrDefs newDynamicAttrs{std::move(*dynamicAttrs), arena};
dynamicAttrs.emplace(std::move(newDynamicAttrs), arena);
if (inheritFromExprs)
inheritFromExprs = std::make_unique<std::pmr::vector<Expr *>>(std::move(*inheritFromExprs), arena);
}
moveDataToAllocator(es.mem.exprs.alloc);
if (es.debugRepl)
es.exprEnvs.insert(std::make_pair(this, env));
@ -484,14 +485,15 @@ void ExprLambda::bindVars(EvalState & es, const std::shared_ptr<const StaticEnv>
body->bindVars(es, newEnv);
}
void ExprCall::moveDataToAllocator(std::pmr::polymorphic_allocator<char> & alloc)
{
std::pmr::vector<Expr *> newArgs{std::move(*args), alloc};
args.emplace(std::move(newArgs), alloc);
}
void ExprCall::bindVars(EvalState & es, const std::shared_ptr<const StaticEnv> & env)
{
// Move storage into the Exprs arena
{
auto arena = es.mem.exprs.alloc;
std::pmr::vector<Expr *> newArgs{std::move(*args), arena};
args.emplace(std::move(newArgs), arena);
}
moveDataToAllocator(es.mem.exprs.alloc);
if (es.debugRepl)
es.exprEnvs.insert(std::make_pair(this, env));