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refactor: Extract EvalState::{runDebugRepl,canDebug}

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This commit is contained in:
Robert Hensing 2024-05-01 23:02:43 +02:00
parent da82d67022
commit c07500e14d
4 changed files with 37 additions and 15 deletions
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7
src/libexpr/eval-error.cc
View file

@ -73,12 +73,7 @@ EvalErrorBuilder<T>::addTrace(PosIdx pos, std::string_view formatString, const A
template<class T>
void EvalErrorBuilder<T>::debugThrow()
{
if (error.state.debugRepl && !error.state.debugTraces.empty()) {
const DebugTrace & last = error.state.debugTraces.front();
const Env * env = &last.env;
const Expr * expr = &last.expr;
error.state.runDebugRepl(&error, *env, *expr);
}
error.state.runDebugRepl(&error);
// `EvalState` is the only class that can construct an `EvalErrorBuilder`,
// and it does so in dynamic storage. This is the final method called on

18
src/libexpr/eval.cc
View file

@ -785,6 +785,24 @@ public:
}
};
bool EvalState::canDebug()
{
return debugRepl && !debugTraces.empty();
}
void EvalState::runDebugRepl(const Error * error)
{
if (!canDebug())
return;
assert(!debugTraces.empty());
const DebugTrace & last = debugTraces.front();
const Env & env = last.env;
const Expr & expr = last.expr;
runDebugRepl(error, env, expr);
}
void EvalState::runDebugRepl(const Error * error, const Env & env, const Expr & expr)
{
// Make sure we have a debugger to run and we're not already in a debugger.

12
src/libexpr/eval.hh
View file

@ -276,6 +276,18 @@ public:
return std::shared_ptr<const StaticEnv>();;
}
/** Whether a debug repl can be started. If `false`, `runDebugRepl(error)` will return without starting a repl. */
bool canDebug();
/** Use front of `debugTraces`; see `runDebugRepl(error,env,expr)` */
void runDebugRepl(const Error * error);
/**
* Run a debug repl with the given error, environment and expression.
* @param error The error to debug, may be nullptr.
* @param env The environment to debug, matching the expression.
* @param expr The expression to debug, matching the environment.
*/
void runDebugRepl(const Error * error, const Env & env, const Expr & expr);
template<class T, typename... Args>

15
src/libexpr/primops.cc
View file

@ -780,15 +780,14 @@ static RegisterPrimOp primop_break({
)",
.fun = [](EvalState & state, const PosIdx pos, Value * * args, Value & v)
{
if (state.debugRepl && !state.debugTraces.empty()) {
if (state.canDebug()) {
auto error = Error(ErrorInfo {
.level = lvlInfo,
.msg = HintFmt("breakpoint reached"),
.pos = state.positions[pos],
});
auto & dt = state.debugTraces.front();
state.runDebugRepl(&error, dt.env, dt.expr);
state.runDebugRepl(&error);
}
// Return the value we were passed.
@ -1018,9 +1017,8 @@ static void prim_trace(EvalState & state, const PosIdx pos, Value * * args, Valu
printError("trace: %1%", args[0]->string_view());
else
printError("trace: %1%", ValuePrinter(state, *args[0]));
if (evalSettings.builtinsTraceDebugger && state.debugRepl && !state.debugTraces.empty()) {
const DebugTrace & last = state.debugTraces.front();
state.runDebugRepl(nullptr, last.env, last.expr);
if (evalSettings.builtinsTraceDebugger) {
state.runDebugRepl(nullptr);
}
state.forceValue(*args[1], pos);
v = *args[1];
@ -1060,9 +1058,8 @@ static void prim_warn(EvalState & state, const PosIdx pos, Value * * args, Value
if (evalSettings.builtinsAbortOnWarn) {
state.error<Abort>("aborting to reveal stack trace of warning, as abort-on-warn is set").debugThrow();
}
if ((evalSettings.builtinsTraceDebugger || evalSettings.builtinsDebuggerOnWarn) && state.debugRepl && !state.debugTraces.empty()) {
const DebugTrace & last = state.debugTraces.front();
state.runDebugRepl(nullptr, last.env, last.expr);
if (evalSettings.builtinsTraceDebugger || evalSettings.builtinsDebuggerOnWarn) {
state.runDebugRepl(nullptr);
}
state.forceValue(*args[1], pos);
v = *args[1];