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Merge pull request #9582 from pennae/misc-opts

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a packet of small optimizations
This commit is contained in:
Robert Hensing 2023-12-22 17:00:59 +01:00 • committed by GitHub
commit ee439734e9
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20 changed files with 148 additions and 76 deletions
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67
src/libexpr/eval.cc
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@ -163,7 +163,17 @@ void Value::print(const SymbolTable &symbols, std::ostream &str,
break;
case tThunk:
case tApp:
str << "<CODE>";
if (!isBlackhole()) {
str << "<CODE>";
} else {
// Although we know for sure that it's going to be an infinite recursion
// when this value is accessed _in the current context_, it's likely
// that the user will misinterpret a simpler «infinite recursion» output
// as a definitive statement about the value, while in fact it may be
// a valid value after `builtins.trace` and perhaps some other steps
// have completed.
str << "«potential infinite recursion»";
}
break;
case tLambda:
str << "<LAMBDA>";
@ -180,15 +190,6 @@ void Value::print(const SymbolTable &symbols, std::ostream &str,
case tFloat:
str << fpoint;
break;
case tBlackhole:
// Although we know for sure that it's going to be an infinite recursion
// when this value is accessed _in the current context_, it's likely
// that the user will misinterpret a simpler «infinite recursion» output
// as a definitive statement about the value, while in fact it may be
// a valid value after `builtins.trace` and perhaps some other steps
// have completed.
str << "«potential infinite recursion»";
break;
default:
printError("Nix evaluator internal error: Value::print(): invalid value type %1%", internalType);
abort();
@ -256,9 +257,8 @@ std::string showType(const Value & v)
case tPrimOpApp:
return fmt("the partially applied built-in function '%s'", std::string(getPrimOp(v)->primOp->name));
case tExternal: return v.external->showType();
case tThunk: return "a thunk";
case tThunk: return v.isBlackhole() ? "a black hole" : "a thunk";
case tApp: return "a function application";
case tBlackhole: return "a black hole";
default:
return std::string(showType(v.type()));
}
@ -1646,15 +1646,15 @@ void EvalState::callFunction(Value & fun, size_t nrArgs, Value * * args, Value &
return;
} else {
/* We have all the arguments, so call the primop. */
auto name = vCur.primOp->name;
auto * fn = vCur.primOp;
nrPrimOpCalls++;
if (countCalls) primOpCalls[name]++;
if (countCalls) primOpCalls[fn->name]++;
try {
vCur.primOp->fun(*this, vCur.determinePos(noPos), args, vCur);
fn->fun(*this, vCur.determinePos(noPos), args, vCur);
} catch (Error & e) {
addErrorTrace(e, pos, "while calling the '%1%' builtin", name);
addErrorTrace(e, pos, "while calling the '%1%' builtin", fn->name);
throw;
}
@ -1691,18 +1691,18 @@ void EvalState::callFunction(Value & fun, size_t nrArgs, Value * * args, Value &
for (size_t i = 0; i < argsLeft; ++i)
vArgs[argsDone + i] = args[i];
auto name = primOp->primOp->name;
auto fn = primOp->primOp;
nrPrimOpCalls++;
if (countCalls) primOpCalls[name]++;
if (countCalls) primOpCalls[fn->name]++;
try {
// TODO:
// 1. Unify this and above code. Heavily redundant.
// 2. Create a fake env (arg1, arg2, etc.) and a fake expr (arg1: arg2: etc: builtins.name arg1 arg2 etc)
// so the debugger allows to inspect the wrong parameters passed to the builtin.
primOp->primOp->fun(*this, vCur.determinePos(noPos), vArgs, vCur);
fn->fun(*this, vCur.determinePos(noPos), vArgs, vCur);
} catch (Error & e) {
addErrorTrace(e, pos, "while calling the '%1%' builtin", name);
addErrorTrace(e, pos, "while calling the '%1%' builtin", fn->name);
throw;
}
@ -2056,6 +2056,29 @@ void ExprPos::eval(EvalState & state, Env & env, Value & v)
}
void ExprBlackHole::eval(EvalState & state, Env & env, Value & v)
{
state.error("infinite recursion encountered")
.debugThrow<InfiniteRecursionError>();
}
// always force this to be separate, otherwise forceValue may inline it and take
// a massive perf hit
[[gnu::noinline]]
void EvalState::tryFixupBlackHolePos(Value & v, PosIdx pos)
{
if (!v.isBlackhole())
return;
auto e = std::current_exception();
try {
std::rethrow_exception(e);
} catch (InfiniteRecursionError & e) {
e.err.errPos = positions[pos];
} catch (...) {
}
}
void EvalState::forceValueDeep(Value & v)
{
std::set<const Value *> seen;
@ -2065,7 +2088,7 @@ void EvalState::forceValueDeep(Value & v)
recurse = [&](Value & v) {
if (!seen.insert(&v).second) return;
forceValue(v, [&]() { return v.determinePos(noPos); });
forceValue(v, v.determinePos(noPos));
if (v.type() == nAttrs) {
for (auto & i : *v.attrs)
@ -2457,7 +2480,7 @@ bool EvalState::eqValues(Value & v1, Value & v2, const PosIdx pos, std::string_v
return v1.boolean == v2.boolean;
case nString:
return v1.string_view().compare(v2.string_view()) == 0;
return strcmp(v1.c_str(), v2.c_str()) == 0;
case nPath:
return