forked from lix-project/lix
Robert Hensing
f10465774f
This fixes a class of crashes and introduces ptr<T> to make the code robust against this failure mode going forward. Thanks regnat for the idea of a ref<T> without overhead! Closes #4895 Closes #4893 Closes #5127 Closes #5113
118 lines
2.7 KiB
C++
118 lines
2.7 KiB
C++
#pragma once
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#include "nixexpr.hh"
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#include "symbol-table.hh"
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#include <algorithm>
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#include <optional>
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namespace nix {
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class EvalState;
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struct Value;
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/* Map one attribute name to its value. */
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struct Attr
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{
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Symbol name;
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Value * value;
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ptr<Pos> pos;
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Attr(Symbol name, Value * value, ptr<Pos> pos = ptr(&noPos))
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: name(name), value(value), pos(pos) { };
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Attr() : pos(&noPos) { };
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bool operator < (const Attr & a) const
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{
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return name < a.name;
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}
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};
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/* Bindings contains all the attributes of an attribute set. It is defined
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by its size and its capacity, the capacity being the number of Attr
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elements allocated after this structure, while the size corresponds to
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the number of elements already inserted in this structure. */
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class Bindings
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{
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public:
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typedef uint32_t size_t;
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ptr<Pos> pos;
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private:
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size_t size_, capacity_;
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Attr attrs[0];
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Bindings(size_t capacity) : pos(&noPos), size_(0), capacity_(capacity) { }
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Bindings(const Bindings & bindings) = delete;
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public:
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size_t size() const { return size_; }
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bool empty() const { return !size_; }
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typedef Attr * iterator;
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void push_back(const Attr & attr)
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{
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assert(size_ < capacity_);
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attrs[size_++] = attr;
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}
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iterator find(const Symbol & name)
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{
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Attr key(name, 0);
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iterator i = std::lower_bound(begin(), end(), key);
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if (i != end() && i->name == name) return i;
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return end();
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}
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Attr * get(const Symbol & name)
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{
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Attr key(name, 0);
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iterator i = std::lower_bound(begin(), end(), key);
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if (i != end() && i->name == name) return &*i;
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return nullptr;
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}
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Attr & need(const Symbol & name, const Pos & pos = noPos)
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{
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auto a = get(name);
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if (!a)
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throw Error({
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.msg = hintfmt("attribute '%s' missing", name),
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.errPos = pos
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});
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return *a;
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}
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iterator begin() { return &attrs[0]; }
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iterator end() { return &attrs[size_]; }
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Attr & operator[](size_t pos)
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{
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return attrs[pos];
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}
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void sort();
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size_t capacity() { return capacity_; }
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/* Returns the attributes in lexicographically sorted order. */
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std::vector<const Attr *> lexicographicOrder() const
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{
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std::vector<const Attr *> res;
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res.reserve(size_);
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for (size_t n = 0; n < size_; n++)
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res.emplace_back(&attrs[n]);
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std::sort(res.begin(), res.end(), [](const Attr * a, const Attr * b) {
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return (const string &) a->name < (const string &) b->name;
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});
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return res;
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}
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friend class EvalState;
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};
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}
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