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Merge pull request #4914 from gytis-ivaskevicius/master

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Add builtins.debug
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Théophane Hufschmitt 2022-07-06 06:41:18 +02:00 committed by GitHub
parent f653185107 b2703c73a4
commit b0e18df994
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3 changed files with 26 additions and 0 deletions
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3
src/libexpr/eval.hh
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@ -646,6 +646,9 @@ struct EvalSettings : Config
Setting<bool> useEvalCache{this, true, "eval-cache",
"Whether to use the flake evaluation cache."};
Setting<bool> traceVerbose{this, false, "trace-verbose",
"Whether `builtins.traceVerbose` should trace its first argument when evaluated."};
};
extern EvalSettings evalSettings;

21
src/libexpr/primops.cc
View file

@ -970,6 +970,15 @@ static RegisterPrimOp primop_trace({
});
/* Takes two arguments and evaluates to the second one. Used as the
* builtins.traceVerbose implementation when --trace-verbose is not enabled
*/
static void prim_second(EvalState & state, const PosIdx pos, Value * * args, Value & v)
{
state.forceValue(*args[1], pos);
v = *args[1];
}
/*************************************************************
* Derivations
*************************************************************/
@ -3926,6 +3935,18 @@ void EvalState::createBaseEnv()
addPrimOp("__exec", 1, prim_exec);
}
addPrimOp({
.fun = evalSettings.traceVerbose ? prim_trace : prim_second,
.arity = 2,
.name = "__traceVerbose",
.args = { "e1", "e2" },
.doc = R"(
Evaluate *e1* and print its abstract syntax representation on standard
error if `--trace-verbose` is enabled. Then return *e2*. This function
is useful for debugging.
)",
});
/* Add a value containing the current Nix expression search path. */
mkList(v, searchPath.size());
int n = 0;

2
tests/lang.sh
View file

@ -5,6 +5,8 @@ export NIX_REMOTE=dummy://
nix-instantiate --eval -E 'builtins.trace "Hello" 123' 2>&1 | grep -q Hello
nix-instantiate --eval -E 'builtins.addErrorContext "Hello" 123' 2>&1
nix-instantiate --trace-verbose --eval -E 'builtins.traceVerbose "Hello" 123' 2>&1 | grep -q Hello
(! nix-instantiate --eval -E 'builtins.traceVerbose "Hello" 123' 2>&1 | grep -q Hello)
(! nix-instantiate --show-trace --eval -E 'builtins.addErrorContext "Hello" 123' 2>&1 | grep -q Hello)
nix-instantiate --show-trace --eval -E 'builtins.addErrorContext "Hello" (throw "Foo")' 2>&1 | grep -q Hello