mirror of
https://github.com/NixOS/nix.git
synced 2025-12-09 18:41:03 +01:00
6526d1676b
Pos objects are somewhat wasteful as they duplicate the origin file name and input type for each object. on files that produce more than one Pos when parsed this a sizeable waste of memory (one pointer per Pos). the same goes for ptr<Pos> on 64 bit machines: parsing enough source to require 8 bytes to locate a position would need at least 8GB of input and 64GB of expression memory. it's not likely that we'll hit that any time soon, so we can use a uint32_t index to locate positions instead.
70 lines
1.6 KiB
C++
70 lines
1.6 KiB
C++
#include "attr-set.hh"
|
|
#include "eval-inline.hh"
|
|
|
|
#include <algorithm>
|
|
|
|
|
|
namespace nix {
|
|
|
|
|
|
|
|
/* Allocate a new array of attributes for an attribute set with a specific
|
|
capacity. The space is implicitly reserved after the Bindings
|
|
structure. */
|
|
Bindings * EvalState::allocBindings(size_t capacity)
|
|
{
|
|
if (capacity == 0)
|
|
return &emptyBindings;
|
|
if (capacity > std::numeric_limits<Bindings::size_t>::max())
|
|
throw Error("attribute set of size %d is too big", capacity);
|
|
nrAttrsets++;
|
|
nrAttrsInAttrsets += capacity;
|
|
return new (allocBytes(sizeof(Bindings) + sizeof(Attr) * capacity)) Bindings((Bindings::size_t) capacity);
|
|
}
|
|
|
|
|
|
/* Create a new attribute named 'name' on an existing attribute set stored
|
|
in 'vAttrs' and return the newly allocated Value which is associated with
|
|
this attribute. */
|
|
Value * EvalState::allocAttr(Value & vAttrs, const Symbol & name)
|
|
{
|
|
Value * v = allocValue();
|
|
vAttrs.attrs->push_back(Attr(name, v));
|
|
return v;
|
|
}
|
|
|
|
|
|
Value * EvalState::allocAttr(Value & vAttrs, std::string_view name)
|
|
{
|
|
return allocAttr(vAttrs, symbols.create(name));
|
|
}
|
|
|
|
|
|
Value & BindingsBuilder::alloc(const Symbol & name, PosIdx pos)
|
|
{
|
|
auto value = state.allocValue();
|
|
bindings->push_back(Attr(name, value, pos));
|
|
return *value;
|
|
}
|
|
|
|
|
|
Value & BindingsBuilder::alloc(std::string_view name, PosIdx pos)
|
|
{
|
|
return alloc(state.symbols.create(name), pos);
|
|
}
|
|
|
|
|
|
void Bindings::sort()
|
|
{
|
|
if (size_) std::sort(begin(), end());
|
|
}
|
|
|
|
|
|
Value & Value::mkAttrs(BindingsBuilder & bindings)
|
|
{
|
|
mkAttrs(bindings.finish());
|
|
return *this;
|
|
}
|
|
|
|
|
|
}
|