forked from lix-project/lix
Merge pull request #9914 from 9999years/debugger-on-trace
Enter debugger on `builtins.trace` with an option
(cherry picked from commit 774e7ca5847ebc392eac2a124a8f12b24da4f65a)
Change-Id: If01e2110b3a128e639b05143227e365227d149f1
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9
doc/manual/rl-next/debugger-on-trace.md
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9
doc/manual/rl-next/debugger-on-trace.md
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@ -0,0 +1,9 @@
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---
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synopsis: Enter the `--debugger` when `builtins.trace` is called if `debugger-on-trace` is set
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prs: 9914
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---
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If the `debugger-on-trace` option is set and `--debugger` is given,
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`builtins.trace` calls will behave similarly to `builtins.break` and will enter
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the debug REPL. This is useful for determining where warnings are being emitted
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from.
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@ -114,6 +114,16 @@ struct EvalSettings : Config
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Setting<unsigned int> maxCallDepth{this, 10000, "max-call-depth",
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"The maximum function call depth to allow before erroring."};
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Setting<bool> builtinsTraceDebugger{this, false, "debugger-on-trace",
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R"(
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If set to true and the `--debugger` flag is given,
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[`builtins.trace`](@docroot@/language/builtins.md#builtins-trace) will
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enter the debugger like
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[`builtins.break`](@docroot@/language/builtins.md#builtins-break).
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This is useful for debugging warnings in third-party Nix code.
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)"};
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};
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extern EvalSettings evalSettings;
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@ -980,6 +980,10 @@ static void prim_trace(EvalState & state, const PosIdx pos, Value * * args, Valu
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printError("trace: %1%", args[0]->string.s);
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else
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printError("trace: %1%", ValuePrinter(state, *args[0]));
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if (evalSettings.builtinsTraceDebugger && state.debugRepl && !state.debugTraces.empty()) {
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const DebugTrace & last = state.debugTraces.front();
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state.runDebugRepl(nullptr, last.env, last.expr);
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}
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state.forceValue(*args[1], pos);
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v = *args[1];
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}
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@ -991,6 +995,12 @@ static RegisterPrimOp primop_trace({
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Evaluate *e1* and print its abstract syntax representation on
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standard error. Then return *e2*. This function is useful for
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debugging.
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If the
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[`debugger-on-trace`](@docroot@/command-ref/conf-file.md#conf-debugger-on-trace)
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option is set to `true` and the `--debugger` flag is given, the
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interactive debugger will be started when `trace` is called (like
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[`break`](@docroot@/language/builtins.md#builtins-break)).
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)",
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.fun = prim_trace,
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});
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