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Hide FunctionCallTrace constructor/destructor

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This prevents them from being inlined. On gcc 9, this reduces the
stack size needed for

  nix-instantiate '<nixpkgs>' -A texlive.combined.scheme-full --dry-run

from 12.9 MiB to 4.8 MiB.
This commit is contained in:
Eelco Dolstra 2020-01-05 16:21:34 +01:00
parent 0de33cc81b
commit cb90e382b5
3 changed files with 20 additions and 15 deletions
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4
src/libexpr/eval.cc
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@ -1106,9 +1106,7 @@ void EvalState::callPrimOp(Value & fun, Value & arg, Value & v, const Pos & pos)
void EvalState::callFunction(Value & fun, Value & arg, Value & v, const Pos & pos)
{
std::unique_ptr<FunctionCallTrace> trace;
if (evalSettings.traceFunctionCalls)
trace = std::make_unique<FunctionCallTrace>(pos);
auto trace = evalSettings.traceFunctionCalls ? std::make_unique<FunctionCallTrace>(pos) : nullptr;
forceValue(fun, pos);