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-rw-r--r--src/libexpr/attr-set.hh8
-rw-r--r--src/libexpr/eval.cc24
-rw-r--r--src/libexpr/eval.hh2
-rw-r--r--src/libexpr/primops.cc4
-rw-r--r--src/libexpr/value-to-xml.cc2
-rw-r--r--src/libutil/ref.hh43
-rw-r--r--src/nix-env/user-env.cc4
7 files changed, 65 insertions, 22 deletions
diff --git a/src/libexpr/attr-set.hh b/src/libexpr/attr-set.hh
index 1da8d91df..7d6ffc9f3 100644
--- a/src/libexpr/attr-set.hh
+++ b/src/libexpr/attr-set.hh
@@ -17,8 +17,8 @@ struct Attr
{
Symbol name;
Value * value;
- Pos * pos;
- Attr(Symbol name, Value * value, Pos * pos = &noPos)
+ ptr<Pos> pos;
+ Attr(Symbol name, Value * value, ptr<Pos> pos = ptr(&noPos))
: name(name), value(value), pos(pos) { };
Attr() : pos(&noPos) { };
bool operator < (const Attr & a) const
@@ -35,13 +35,13 @@ class Bindings
{
public:
typedef uint32_t size_t;
- Pos *pos;
+ ptr<Pos> pos;
private:
size_t size_, capacity_;
Attr attrs[0];
- Bindings(size_t capacity) : size_(0), capacity_(capacity) { }
+ Bindings(size_t capacity) : pos(&noPos), size_(0), capacity_(capacity) { }
Bindings(const Bindings & bindings) = delete;
public:
diff --git a/src/libexpr/eval.cc b/src/libexpr/eval.cc
index 327f7e974..361c52151 100644
--- a/src/libexpr/eval.cc
+++ b/src/libexpr/eval.cc
@@ -770,7 +770,7 @@ inline Value * EvalState::lookupVar(Env * env, const ExprVar & var, bool noEval)
}
Bindings::iterator j = env->values[0]->attrs->find(var.name);
if (j != env->values[0]->attrs->end()) {
- if (countCalls && j->pos) attrSelects[*j->pos]++;
+ if (countCalls) attrSelects[*j->pos]++;
return j->value;
}
if (!env->prevWith)
@@ -825,9 +825,9 @@ void EvalState::mkThunk_(Value & v, Expr * expr)
}
-void EvalState::mkPos(Value & v, Pos * pos)
+void EvalState::mkPos(Value & v, ptr<Pos> pos)
{
- if (pos && pos->file.set()) {
+ if (pos->file.set()) {
mkAttrs(v, 3);
mkString(*allocAttr(v, sFile), pos->file);
mkInt(*allocAttr(v, sLine), pos->line);
@@ -1027,7 +1027,7 @@ void ExprAttrs::eval(EvalState & state, Env & env, Value & v)
} else
vAttr = i.second.e->maybeThunk(state, i.second.inherited ? env : env2);
env2.values[displ++] = vAttr;
- v.attrs->push_back(Attr(i.first, vAttr, &i.second.pos));
+ v.attrs->push_back(Attr(i.first, vAttr, ptr(&i.second.pos)));
}
/* If the rec contains an attribute called `__overrides', then
@@ -1059,7 +1059,7 @@ void ExprAttrs::eval(EvalState & state, Env & env, Value & v)
else
for (auto & i : attrs)
- v.attrs->push_back(Attr(i.first, i.second.e->maybeThunk(state, env), &i.second.pos));
+ v.attrs->push_back(Attr(i.first, i.second.e->maybeThunk(state, env), ptr(&i.second.pos)));
/* Dynamic attrs apply *after* rec and __overrides. */
for (auto & i : dynamicAttrs) {
@@ -1076,11 +1076,11 @@ void ExprAttrs::eval(EvalState & state, Env & env, Value & v)
i.valueExpr->setName(nameSym);
/* Keep sorted order so find can catch duplicates */
- v.attrs->push_back(Attr(nameSym, i.valueExpr->maybeThunk(state, *dynamicEnv), &i.pos));
+ v.attrs->push_back(Attr(nameSym, i.valueExpr->maybeThunk(state, *dynamicEnv), ptr(&i.pos)));
v.attrs->sort(); // FIXME: inefficient
}
- v.attrs->pos = &pos;
+ v.attrs->pos = ptr(&pos);
}
@@ -1138,7 +1138,7 @@ static string showAttrPath(EvalState & state, Env & env, const AttrPath & attrPa
void ExprSelect::eval(EvalState & state, Env & env, Value & v)
{
Value vTmp;
- Pos * pos2 = 0;
+ ptr<Pos> pos2(&noPos);
Value * vAttrs = &vTmp;
e->eval(state, env, vTmp);
@@ -1164,13 +1164,13 @@ void ExprSelect::eval(EvalState & state, Env & env, Value & v)
}
vAttrs = j->value;
pos2 = j->pos;
- if (state.countCalls && pos2) state.attrSelects[*pos2]++;
+ if (state.countCalls) state.attrSelects[*pos2]++;
}
- state.forceValue(*vAttrs, ( pos2 != NULL ? *pos2 : this->pos ) );
+ state.forceValue(*vAttrs, (*pos2 != noPos ? *pos2 : this->pos ) );
} catch (Error & e) {
- if (pos2 && pos2->file != state.sDerivationNix)
+ if (*pos2 != noPos && pos2->file != state.sDerivationNix)
addErrorTrace(e, *pos2, "while evaluating the attribute '%1%'",
showAttrPath(state, env, attrPath));
throw;
@@ -1616,7 +1616,7 @@ void ExprConcatStrings::eval(EvalState & state, Env & env, Value & v)
void ExprPos::eval(EvalState & state, Env & env, Value & v)
{
- state.mkPos(v, &pos);
+ state.mkPos(v, ptr(&pos));
}
diff --git a/src/libexpr/eval.hh b/src/libexpr/eval.hh
index 03dcfcf21..0fced795d 100644
--- a/src/libexpr/eval.hh
+++ b/src/libexpr/eval.hh
@@ -310,7 +310,7 @@ public:
void mkList(Value & v, size_t length);
void mkAttrs(Value & v, size_t capacity);
void mkThunk_(Value & v, Expr * expr);
- void mkPos(Value & v, Pos * pos);
+ void mkPos(Value & v, ptr<Pos> pos);
void concatLists(Value & v, size_t nrLists, Value * * lists, const Pos & pos);
diff --git a/src/libexpr/primops.cc b/src/libexpr/primops.cc
index 0a4bce1d7..25d60e175 100644
--- a/src/libexpr/primops.cc
+++ b/src/libexpr/primops.cc
@@ -2108,7 +2108,7 @@ void prim_getAttr(EvalState & state, const Pos & pos, Value * * args, Value & v)
pos
);
// !!! add to stack trace?
- if (state.countCalls && i->pos) state.attrSelects[*i->pos]++;
+ if (state.countCalls && *i->pos != noPos) state.attrSelects[*i->pos]++;
state.forceValue(*i->value, pos);
v = *i->value;
}
@@ -2368,7 +2368,7 @@ static void prim_functionArgs(EvalState & state, const Pos & pos, Value * * args
for (auto & i : args[0]->lambda.fun->formals->formals) {
// !!! should optimise booleans (allocate only once)
Value * value = state.allocValue();
- v.attrs->push_back(Attr(i.name, value, &i.pos));
+ v.attrs->push_back(Attr(i.name, value, ptr(&i.pos)));
mkBool(*value, i.def);
}
v.attrs->sort();
diff --git a/src/libexpr/value-to-xml.cc b/src/libexpr/value-to-xml.cc
index 7464455d8..2ddc5f751 100644
--- a/src/libexpr/value-to-xml.cc
+++ b/src/libexpr/value-to-xml.cc
@@ -42,7 +42,7 @@ static void showAttrs(EvalState & state, bool strict, bool location,
XMLAttrs xmlAttrs;
xmlAttrs["name"] = i;
- if (location && a.pos != &noPos) posToXML(xmlAttrs, *a.pos);
+ if (location && a.pos != ptr(&noPos)) posToXML(xmlAttrs, *a.pos);
XMLOpenElement _(doc, "attr", xmlAttrs);
printValueAsXML(state, strict, location,
diff --git a/src/libutil/ref.hh b/src/libutil/ref.hh
index 2549ef496..d6bf53bb8 100644
--- a/src/libutil/ref.hh
+++ b/src/libutil/ref.hh
@@ -99,4 +99,47 @@ make_ref(Args&&... args)
return ref<T>(p);
}
+
+/* A non-nullable pointer.
+ This is similar to a C++ "& reference", but mutable.
+ This is similar to ref<T> but backed by a regular pointer instead of a smart pointer.
+ */
+template<typename T>
+class ptr {
+private:
+ T * p;
+
+public:
+ ptr<T>(const ptr<T> & r)
+ : p(r.p)
+ { }
+
+ explicit ptr<T>(T * p)
+ : p(p)
+ {
+ if (!p)
+ throw std::invalid_argument("null pointer cast to ptr");
+ }
+
+ T* operator ->() const
+ {
+ return &*p;
+ }
+
+ T& operator *() const
+ {
+ return *p;
+ }
+
+ bool operator == (const ptr<T> & other) const
+ {
+ return p == other.p;
+ }
+
+ bool operator != (const ptr<T> & other) const
+ {
+ return p != other.p;
+ }
+};
+
}
diff --git a/src/nix-env/user-env.cc b/src/nix-env/user-env.cc
index 5ceb2ae67..1fd4bcbd3 100644
--- a/src/nix-env/user-env.cc
+++ b/src/nix-env/user-env.cc
@@ -131,9 +131,9 @@ bool createUserEnv(EvalState & state, DrvInfos & elems,
state.forceValue(topLevel);
PathSet context;
Attr & aDrvPath(*topLevel.attrs->find(state.sDrvPath));
- auto topLevelDrv = state.store->parseStorePath(state.coerceToPath(aDrvPath.pos ? *(aDrvPath.pos) : noPos, *(aDrvPath.value), context));
+ auto topLevelDrv = state.store->parseStorePath(state.coerceToPath(*aDrvPath.pos, *aDrvPath.value, context));
Attr & aOutPath(*topLevel.attrs->find(state.sOutPath));
- Path topLevelOut = state.coerceToPath(aOutPath.pos ? *(aOutPath.pos) : noPos, *(aOutPath.value), context);
+ Path topLevelOut = state.coerceToPath(*aOutPath.pos, *aOutPath.value, context);
/* Realise the resulting store expression. */
debug("building user environment");
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-22 14:50:23 +0000