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libexpr: Support structured error classes

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While preparing PRs like #9753, I've had to change error messages in
dozens of code paths. It would be nice if instead of

    EvalError("expected 'boolean' but found '%1%'", showType(v))

we could write

    TypeError(v, "boolean")

or similar. Then, changing the error message could be a mechanical
refactor with the compiler pointing out places the constructor needs to
be changed, rather than the error-prone process of grepping through the
codebase. Structured errors would also help prevent the "same" error
from having multiple slightly different messages, and could be a first
step towards error codes / an error index.

This PR reworks the exception infrastructure in `libexpr` to
support exception types with different constructor signatures than
`BaseError`. Actually refactoring the exceptions to use structured data
will come in a future PR (this one is big enough already, as it has to
touch every exception in `libexpr`).

The core design is in `eval-error.hh`. Generally, errors like this:

    state.error("'%s' is not a string", getAttrPathStr())
      .debugThrow<TypeError>()

are transformed like this:

    state.error<TypeError>("'%s' is not a string", getAttrPathStr())
      .debugThrow()

The type annotation has moved from `ErrorBuilder::debugThrow` to
`EvalState::error`.

(cherry picked from commit c6a89c1a1659b31694c0fbcd21d78a6dd521c732)
Change-Id: Iced91ba4e00ca9e801518071fb43798936cbd05a
This commit is contained in:
eldritch horrors 2024-03-08 07:09:48 +01:00
parent d4c738fe4c
commit 08252967a8
40 changed files with 645 additions and 540 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
src/libcmd/repl.cc
View file

@ -427,8 +427,6 @@ StringSet NixRepl::completePrefix(const std::string & prefix)
// Quietly ignore parse errors.
} catch (EvalError & e) {
// Quietly ignore evaluation errors.
} catch (UndefinedVarError & e) {
// Quietly ignore undefined variable errors.
} catch (BadURL & e) {
// Quietly ignore BadURL flake-related errors.
}

8
src/libexpr/attr-path.cc
View file

@ -66,10 +66,10 @@ std::pair<Value *, PosIdx> findAlongAttrPath(EvalState & state, const std::strin
if (!attrIndex) {
if (v->type() != nAttrs)
throw TypeError(
state.error<TypeError>(
"the expression selected by the selection path '%1%' should be a set but is %2%",
attrPath,
showType(*v));
showType(*v)).debugThrow();
if (attr.empty())
throw Error("empty attribute name in selection path '%1%'", attrPath);
@ -89,10 +89,10 @@ std::pair<Value *, PosIdx> findAlongAttrPath(EvalState & state, const std::strin
else {
if (!v->isList())
throw TypeError(
state.error<TypeError>(
"the expression selected by the selection path '%1%' should be a list but is %2%",
attrPath,
showType(*v));
showType(*v)).debugThrow();
if (*attrIndex >= v->listSize())
throw AttrPathNotFound("list index %1% in selection path '%2%' is out of range", *attrIndex, attrPath);

30
src/libexpr/eval-cache.cc
View file

@ -490,7 +490,7 @@ std::shared_ptr<AttrCursor> AttrCursor::maybeGetAttr(Symbol name, bool forceErro
if (forceErrors)
debug("reevaluating failed cached attribute '%s'", getAttrPathStr(name));
else
throw CachedEvalError("cached failure of attribute '%s'", getAttrPathStr(name));
throw CachedEvalError(root->state, "cached failure of attribute '%s'", getAttrPathStr(name));
} else
return std::make_shared<AttrCursor>(root,
std::make_pair(shared_from_this(), name), nullptr, std::move(attr));
@ -499,7 +499,7 @@ std::shared_ptr<AttrCursor> AttrCursor::maybeGetAttr(Symbol name, bool forceErro
// evaluate to see whether 'name' exists
} else
return nullptr;
//throw TypeError("'%s' is not an attribute set", getAttrPathStr());
//error<TypeError>("'%s' is not an attribute set", getAttrPathStr()).debugThrow();
}
}
@ -507,7 +507,7 @@ std::shared_ptr<AttrCursor> AttrCursor::maybeGetAttr(Symbol name, bool forceErro
if (v.type() != nAttrs)
return nullptr;
//throw TypeError("'%s' is not an attribute set", getAttrPathStr());
//error<TypeError>("'%s' is not an attribute set", getAttrPathStr()).debugThrow();
auto attr = v.attrs->get(name);
@ -573,14 +573,14 @@ std::string AttrCursor::getString()
debug("using cached string attribute '%s'", getAttrPathStr());
return s->first;
} else
root->state.error("'%s' is not a string", getAttrPathStr()).debugThrow<TypeError>();
root->state.error<TypeError>("'%s' is not a string", getAttrPathStr()).debugThrow();
}
}
auto & v = forceValue();
if (v.type() != nString && v.type() != nPath)
root->state.error("'%s' is not a string but %s", getAttrPathStr()).debugThrow<TypeError>();
root->state.error<TypeError>("'%s' is not a string but %s", getAttrPathStr()).debugThrow();
return v.type() == nString ? v.string.s : v.path().to_string();
}
@ -615,7 +615,7 @@ string_t AttrCursor::getStringWithContext()
return *s;
}
} else
root->state.error("'%s' is not a string", getAttrPathStr()).debugThrow<TypeError>();
root->state.error<TypeError>("'%s' is not a string", getAttrPathStr()).debugThrow();
}
}
@ -629,7 +629,7 @@ string_t AttrCursor::getStringWithContext()
else if (v.type() == nPath)
return {v.path().to_string(), {}};
else
root->state.error("'%s' is not a string but %s", getAttrPathStr()).debugThrow<TypeError>();
root->state.error<TypeError>("'%s' is not a string but %s", getAttrPathStr()).debugThrow();
}
bool AttrCursor::getBool()
@ -642,14 +642,14 @@ bool AttrCursor::getBool()
debug("using cached Boolean attribute '%s'", getAttrPathStr());
return *b;
} else
root->state.error("'%s' is not a Boolean", getAttrPathStr()).debugThrow<TypeError>();
root->state.error<TypeError>("'%s' is not a Boolean", getAttrPathStr()).debugThrow();
}
}
auto & v = forceValue();
if (v.type() != nBool)
root->state.error("'%s' is not a Boolean", getAttrPathStr()).debugThrow<TypeError>();
root->state.error<TypeError>("'%s' is not a Boolean", getAttrPathStr()).debugThrow();
return v.boolean;
}
@ -664,14 +664,14 @@ NixInt AttrCursor::getInt()
debug("using cached integer attribute '%s'", getAttrPathStr());
return i->x;
} else
throw TypeError("'%s' is not an integer", getAttrPathStr());
root->state.error<TypeError>("'%s' is not an integer", getAttrPathStr()).debugThrow();
}
}
auto & v = forceValue();
if (v.type() != nInt)
throw TypeError("'%s' is not an integer", getAttrPathStr());
root->state.error<TypeError>("'%s' is not an integer", getAttrPathStr()).debugThrow();
return v.integer;
}
@ -686,7 +686,7 @@ std::vector<std::string> AttrCursor::getListOfStrings()
debug("using cached list of strings attribute '%s'", getAttrPathStr());
return *l;
} else
throw TypeError("'%s' is not a list of strings", getAttrPathStr());
root->state.error<TypeError>("'%s' is not a list of strings", getAttrPathStr()).debugThrow();
}
}
@ -696,7 +696,7 @@ std::vector<std::string> AttrCursor::getListOfStrings()
root->state.forceValue(v, noPos);
if (v.type() != nList)
throw TypeError("'%s' is not a list", getAttrPathStr());
root->state.error<TypeError>("'%s' is not a list", getAttrPathStr()).debugThrow();
std::vector<std::string> res;
@ -719,14 +719,14 @@ std::vector<Symbol> AttrCursor::getAttrs()
debug("using cached attrset attribute '%s'", getAttrPathStr());
return *attrs;
} else
root->state.error("'%s' is not an attribute set", getAttrPathStr()).debugThrow<TypeError>();
root->state.error<TypeError>("'%s' is not an attribute set", getAttrPathStr()).debugThrow();
}
}
auto & v = forceValue();
if (v.type() != nAttrs)
root->state.error("'%s' is not an attribute set", getAttrPathStr()).debugThrow<TypeError>();
root->state.error<TypeError>("'%s' is not an attribute set", getAttrPathStr()).debugThrow();
std::vector<Symbol> attrs;
for (auto & attr : *getValue().attrs)

2
src/libexpr/eval-cache.hh
View file

@ -10,8 +10,6 @@
namespace nix::eval_cache {
MakeError(CachedEvalError, EvalError);
struct AttrDb;
class AttrCursor;

113
src/libexpr/eval-error.cc Normal file
View file

@ -0,0 +1,113 @@
#include "eval-error.hh"
#include "eval.hh"
#include "value.hh"
namespace nix {
template<class T>
EvalErrorBuilder<T> & EvalErrorBuilder<T>::withExitStatus(unsigned int exitStatus)
{
error.withExitStatus(exitStatus);
return *this;
}
template<class T>
EvalErrorBuilder<T> & EvalErrorBuilder<T>::atPos(PosIdx pos)
{
error.err.pos = error.state.positions[pos];
return *this;
}
template<class T>
EvalErrorBuilder<T> & EvalErrorBuilder<T>::atPos(Value & value, PosIdx fallback)
{
return atPos(value.determinePos(fallback));
}
template<class T>
EvalErrorBuilder<T> & EvalErrorBuilder<T>::withTrace(PosIdx pos, const std::string_view text)
{
error.err.traces.push_front(
Trace{.pos = error.state.positions[pos], .hint = hintfmt(std::string(text)), .frame = false});
return *this;
}
template<class T>
EvalErrorBuilder<T> & EvalErrorBuilder<T>::withFrameTrace(PosIdx pos, const std::string_view text)
{
error.err.traces.push_front(
Trace{.pos = error.state.positions[pos], .hint = hintformat(std::string(text)), .frame = true});
return *this;
}
template<class T>
EvalErrorBuilder<T> & EvalErrorBuilder<T>::withSuggestions(Suggestions & s)
{
error.err.suggestions = s;
return *this;
}
template<class T>
EvalErrorBuilder<T> & EvalErrorBuilder<T>::withFrame(const Env & env, const Expr & expr)
{
// NOTE: This is abusing side-effects.
// TODO: check compatibility with nested debugger calls.
// TODO: What side-effects??
error.state.debugTraces.push_front(DebugTrace{
.pos = error.state.positions[expr.getPos()],
.expr = expr,
.env = env,
.hint = hintformat("Fake frame for debugging purposes"),
.isError = true});
return *this;
}
template<class T>
EvalErrorBuilder<T> & EvalErrorBuilder<T>::addTrace(PosIdx pos, hintformat hint, bool frame)
{
error.addTrace(error.state.positions[pos], hint, frame);
return *this;
}
template<class T>
template<typename... Args>
EvalErrorBuilder<T> &
EvalErrorBuilder<T>::addTrace(PosIdx pos, std::string_view formatString, const Args &... formatArgs)
{
addTrace(error.state.positions[pos], hintfmt(std::string(formatString), formatArgs...));
return *this;
}
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);
}
// `EvalState` is the only class that can construct an `EvalErrorBuilder`,
// and it does so in dynamic storage. This is the final method called on
// any such instancve and must delete itself before throwing the underlying
// error.
auto error = std::move(this->error);
delete this;
throw error;
}
template class EvalErrorBuilder<EvalError>;
template class EvalErrorBuilder<AssertionError>;
template class EvalErrorBuilder<ThrownError>;
template class EvalErrorBuilder<Abort>;
template class EvalErrorBuilder<TypeError>;
template class EvalErrorBuilder<UndefinedVarError>;
template class EvalErrorBuilder<MissingArgumentError>;
template class EvalErrorBuilder<InfiniteRecursionError>;
template class EvalErrorBuilder<CachedEvalError>;
template class EvalErrorBuilder<InvalidPathError>;
}

119
src/libexpr/eval-error.hh Normal file
View file

@ -0,0 +1,119 @@
#pragma once
#include <algorithm>
#include "error.hh"
#include "pos-idx.hh"
namespace nix {
struct Env;
struct Expr;
struct Value;
class EvalState;
template<class T>
class EvalErrorBuilder;
class EvalError : public Error
{
template<class T>
friend class EvalErrorBuilder;
public:
EvalState & state;
EvalError(EvalState & state, ErrorInfo && errorInfo)
: Error(errorInfo)
, state(state)
{
}
template<typename... Args>
explicit EvalError(EvalState & state, const std::string & formatString, const Args &... formatArgs)
: Error(formatString, formatArgs...)
, state(state)
{
}
};
MakeError(ParseError, Error);
MakeError(AssertionError, EvalError);
MakeError(ThrownError, AssertionError);
MakeError(Abort, EvalError);
MakeError(TypeError, EvalError);
MakeError(UndefinedVarError, EvalError);
MakeError(MissingArgumentError, EvalError);
MakeError(RestrictedPathError, Error);
MakeError(CachedEvalError, EvalError);
MakeError(InfiniteRecursionError, EvalError);
struct InvalidPathError : public EvalError
{
public:
Path path;
InvalidPathError(EvalState & state, const Path & path)
: EvalError(state, "path '%s' is not valid", path)
{
}
};
template<class T>
class EvalErrorBuilder final
{
friend class EvalState;
template<typename... Args>
explicit EvalErrorBuilder(EvalState & state, const Args &... args)
: error(T(state, args...))
{
}
public:
T error;
[[nodiscard, gnu::noinline]] EvalErrorBuilder<T> & withExitStatus(unsigned int exitStatus);
[[nodiscard, gnu::noinline]] EvalErrorBuilder<T> & atPos(PosIdx pos);
[[nodiscard, gnu::noinline]] EvalErrorBuilder<T> & atPos(Value & value, PosIdx fallback = noPos);
[[nodiscard, gnu::noinline]] EvalErrorBuilder<T> & withTrace(PosIdx pos, const std::string_view text);
[[nodiscard, gnu::noinline]] EvalErrorBuilder<T> & withFrameTrace(PosIdx pos, const std::string_view text);
[[nodiscard, gnu::noinline]] EvalErrorBuilder<T> & withSuggestions(Suggestions & s);
[[nodiscard, gnu::noinline]] EvalErrorBuilder<T> & withFrame(const Env & e, const Expr & ex);
[[nodiscard, gnu::noinline]] EvalErrorBuilder<T> & addTrace(PosIdx pos, hintformat hint, bool frame = false);
template<typename... Args>
[[nodiscard, gnu::noinline]] EvalErrorBuilder<T> &
addTrace(PosIdx pos, std::string_view formatString, const Args &... formatArgs);
[[gnu::noinline, gnu::noreturn]] void debugThrow();
};
/**
* The size needed to allocate any `EvalErrorBuilder<T>`.
*
* The list of classes here needs to be kept in sync with the list of `template
* class` declarations in `eval-error.cc`.
*
* This is used by `EvalState` to preallocate a buffer of sufficient size for
* any `EvalErrorBuilder<T>` to avoid allocating while evaluating Nix code.
*/
constexpr size_t EVAL_ERROR_BUILDER_SIZE = std::max({
sizeof(EvalErrorBuilder<EvalError>),
sizeof(EvalErrorBuilder<AssertionError>),
sizeof(EvalErrorBuilder<ThrownError>),
sizeof(EvalErrorBuilder<Abort>),
sizeof(EvalErrorBuilder<TypeError>),
sizeof(EvalErrorBuilder<UndefinedVarError>),
sizeof(EvalErrorBuilder<MissingArgumentError>),
sizeof(EvalErrorBuilder<InfiniteRecursionError>),
sizeof(EvalErrorBuilder<CachedEvalError>),
sizeof(EvalErrorBuilder<InvalidPathError>),
});
}

15
src/libexpr/eval-inline.hh
View file

@ -3,6 +3,7 @@
#include "print.hh"
#include "eval.hh"
#include "eval-error.hh"
namespace nix {
@ -115,10 +116,11 @@ inline void EvalState::forceAttrs(Value & v, Callable getPos, std::string_view e
PosIdx pos = getPos();
forceValue(v, pos);
if (v.type() != nAttrs) {
error("expected a set but found %1%: %2%",
error<TypeError>(
"expected a set but found %1%: %2%",
showType(v),
ValuePrinter(*this, v, errorPrintOptions))
.withTrace(pos, errorCtx).debugThrow<TypeError>();
ValuePrinter(*this, v, errorPrintOptions)
).withTrace(pos, errorCtx).debugThrow();
}
}
@ -128,10 +130,11 @@ inline void EvalState::forceList(Value & v, const PosIdx pos, std::string_view e
{
forceValue(v, pos);
if (!v.isList()) {
error("expected a list but found %1%: %2%",
error<TypeError>(
"expected a list but found %1%: %2%",
showType(v),
ValuePrinter(*this, v, errorPrintOptions))
.withTrace(pos, errorCtx).debugThrow<TypeError>();
ValuePrinter(*this, v, errorPrintOptions)
).withTrace(pos, errorCtx).debugThrow();
}
}

199
src/libexpr/eval.cc
View file

@ -333,46 +333,6 @@ void initGC()
gcInitialised = true;
}
ErrorBuilder & ErrorBuilder::atPos(PosIdx pos)
{
info.errPos = state.positions[pos];
return *this;
}
ErrorBuilder & ErrorBuilder::withTrace(PosIdx pos, const std::string_view text)
{
info.traces.push_front(Trace{ .pos = state.positions[pos], .hint = hintformat(std::string(text)), .frame = false });
return *this;
}
ErrorBuilder & ErrorBuilder::withFrameTrace(PosIdx pos, const std::string_view text)
{
info.traces.push_front(Trace{ .pos = state.positions[pos], .hint = hintformat(std::string(text)), .frame = true });
return *this;
}
ErrorBuilder & ErrorBuilder::withSuggestions(Suggestions & s)
{
info.suggestions = s;
return *this;
}
ErrorBuilder & ErrorBuilder::withFrame(const Env & env, const Expr & expr)
{
// NOTE: This is abusing side-effects.
// TODO: check compatibility with nested debugger calls.
state.debugTraces.push_front(DebugTrace {
.pos = nullptr,
.expr = expr,
.env = env,
.hint = hintformat("Fake frame for debugging purposes"),
.isError = true
});
return *this;
}
EvalState::EvalState(
const SearchPath & _searchPath,
ref<Store> store,
@ -819,7 +779,7 @@ void EvalState::runDebugRepl(const Error * error, const Env & env, const Expr &
? std::make_unique<DebugTraceStacker>(
*this,
DebugTrace {
.pos = error->info().errPos ? error->info().errPos : positions[expr.getPos()],
.pos = error->info().pos ? error->info().pos : positions[expr.getPos()],
.expr = expr,
.env = env,
.hint = error->info().msg,
@ -936,7 +896,7 @@ inline Value * EvalState::lookupVar(Env * env, const ExprVar & var, bool noEval)
return j->value;
}
if (!fromWith->parentWith)
error("undefined variable '%1%'", symbols[var.name]).atPos(var.pos).withFrame(*env, var).debugThrow<UndefinedVarError>();
error<UndefinedVarError>("undefined variable '%1%'", symbols[var.name]).atPos(var.pos).withFrame(*env, var).debugThrow();
for (size_t l = fromWith->prevWith; l; --l, env = env->up) ;
fromWith = fromWith->parentWith;
}
@ -1162,7 +1122,7 @@ void EvalState::cacheFile(
// computation.
if (mustBeTrivial &&
!(dynamic_cast<ExprAttrs *>(e)))
error("file '%s' must be an attribute set", path).debugThrow<EvalError>();
error<EvalError>("file '%s' must be an attribute set", path).debugThrow();
eval(e, v);
} catch (Error & e) {
addErrorTrace(e, "while evaluating the file '%1%':", resolvedPath.to_string());
@ -1186,10 +1146,11 @@ inline bool EvalState::evalBool(Env & env, Expr * e, const PosIdx pos, std::stri
Value v;
e->eval(*this, env, v);
if (v.type() != nBool)
error("expected a Boolean but found %1%: %2%",
error<TypeError>(
"expected a Boolean but found %1%: %2%",
showType(v),
ValuePrinter(*this, v, errorPrintOptions))
.withFrame(env, *e).debugThrow<TypeError>();
ValuePrinter(*this, v, errorPrintOptions)
).atPos(pos).withFrame(env, *e).debugThrow();
return v.boolean;
} catch (Error & e) {
e.addTrace(positions[pos], errorCtx);
@ -1203,10 +1164,11 @@ inline void EvalState::evalAttrs(Env & env, Expr * e, Value & v, const PosIdx po
try {
e->eval(*this, env, v);
if (v.type() != nAttrs)
error("expected a set but found %1%: %2%",
error<TypeError>(
"expected a set but found %1%: %2%",
showType(v),
ValuePrinter(*this, v, errorPrintOptions))
.withFrame(env, *e).debugThrow<TypeError>();
ValuePrinter(*this, v, errorPrintOptions)
).withFrame(env, *e).debugThrow();
} catch (Error & e) {
e.addTrace(positions[pos], errorCtx);
throw;
@ -1315,7 +1277,7 @@ void ExprAttrs::eval(EvalState & state, Env & env, Value & v)
auto nameSym = state.symbols.create(nameVal.string.s);
Bindings::iterator j = v.attrs->find(nameSym);
if (j != v.attrs->end())
state.error("dynamic attribute '%1%' already defined at %2%", state.symbols[nameSym], state.positions[j->pos]).atPos(i.pos).withFrame(env, *this).debugThrow<EvalError>();
state.error<EvalError>("dynamic attribute '%1%' already defined at %2%", state.symbols[nameSym], state.positions[j->pos]).atPos(i.pos).withFrame(env, *this).debugThrow();
i.valueExpr->setName(nameSym);
/* Keep sorted order so find can catch duplicates */
@ -1440,8 +1402,8 @@ void ExprSelect::eval(EvalState & state, Env & env, Value & v)
for (auto & attr : *vAttrs->attrs)
allAttrNames.insert(state.symbols[attr.name]);
auto suggestions = Suggestions::bestMatches(allAttrNames, state.symbols[name]);
state.error("attribute '%1%' missing", state.symbols[name])
.atPos(pos).withSuggestions(suggestions).withFrame(env, *this).debugThrow<EvalError>();
state.error<EvalError>("attribute '%1%' missing", state.symbols[name])
.atPos(pos).withSuggestions(suggestions).withFrame(env, *this).debugThrow();
}
}
vAttrs = j->value;
@ -1514,7 +1476,7 @@ public:
void EvalState::callFunction(Value & fun, size_t nrArgs, Value * * args, Value & vRes, const PosIdx pos)
{
if (callDepth > evalSettings.maxCallDepth)
error("stack overflow; max-call-depth exceeded").atPos(pos).template debugThrow<EvalError>();
error<EvalError>("stack overflow; max-call-depth exceeded").atPos(pos).debugThrow();
CallDepth _level(callDepth);
auto trace = evalSettings.traceFunctionCalls
@ -1572,13 +1534,13 @@ void EvalState::callFunction(Value & fun, size_t nrArgs, Value * * args, Value &
auto j = args[0]->attrs->get(i.name);
if (!j) {
if (!i.def) {
error("function '%1%' called without required argument '%2%'",
error<TypeError>("function '%1%' called without required argument '%2%'",
(lambda.name ? std::string(symbols[lambda.name]) : "anonymous lambda"),
symbols[i.name])
.atPos(lambda.pos)
.withTrace(pos, "from call site")
.withFrame(*fun.lambda.env, lambda)
.debugThrow<TypeError>();
.debugThrow();
}
env2.values[displ++] = i.def->maybeThunk(*this, env2);
} else {
@ -1598,14 +1560,14 @@ void EvalState::callFunction(Value & fun, size_t nrArgs, Value * * args, Value &
for (auto & formal : lambda.formals->formals)
formalNames.insert(symbols[formal.name]);
auto suggestions = Suggestions::bestMatches(formalNames, symbols[i.name]);
error("function '%1%' called with unexpected argument '%2%'",
error<TypeError>("function '%1%' called with unexpected argument '%2%'",
(lambda.name ? std::string(symbols[lambda.name]) : "anonymous lambda"),
symbols[i.name])
.atPos(lambda.pos)
.withTrace(pos, "from call site")
.withSuggestions(suggestions)
.withFrame(*fun.lambda.env, lambda)
.debugThrow<TypeError>();
.debugThrow();
}
abort(); // can't happen
}
@ -1737,11 +1699,12 @@ void EvalState::callFunction(Value & fun, size_t nrArgs, Value * * args, Value &
}
else
error("attempt to call something which is not a function but %1%: %2%",
error<TypeError>(
"attempt to call something which is not a function but %1%: %2%",
showType(vCur),
ValuePrinter(*this, vCur, errorPrintOptions))
.atPos(pos)
.debugThrow<TypeError>();
.debugThrow();
}
vRes = vCur;
@ -1823,12 +1786,12 @@ void EvalState::autoCallFunction(Bindings & args, Value & fun, Value & res)
if (j != args.end()) {
attrs.insert(*j);
} else if (!i.def) {
error(R"(cannot evaluate a function that has an argument without a value ('%1%')
error<MissingArgumentError>(R"(cannot evaluate a function that has an argument without a value ('%1%')
Nix attempted to evaluate a function as a top level expression; in
this case it must have its arguments supplied either by default
values, or passed explicitly with '--arg' or '--argstr'. See
https://nixos.org/manual/nix/stable/language/constructs.html#functions.)", symbols[i.name])
.atPos(i.pos).withFrame(*fun.lambda.env, *fun.lambda.fun).debugThrow<MissingArgumentError>();
.atPos(i.pos).withFrame(*fun.lambda.env, *fun.lambda.fun).debugThrow();
}
}
}
@ -1859,7 +1822,7 @@ void ExprAssert::eval(EvalState & state, Env & env, Value & v)
if (!state.evalBool(env, cond, pos, "in the condition of the assert statement")) {
std::ostringstream out;
cond->show(state.symbols, out);
state.error("assertion '%1%' failed", out.str()).atPos(pos).withFrame(env, *this).debugThrow<AssertionError>();
state.error<AssertionError>("assertion '%1%' failed", out.str()).atPos(pos).withFrame(env, *this).debugThrow();
}
body->eval(state, env, v);
}
@ -2037,14 +2000,14 @@ void ExprConcatStrings::eval(EvalState & state, Env & env, Value & v)
nf = n;
nf += vTmp.fpoint;
} else
state.error("cannot add %1% to an integer", showType(vTmp)).atPos(i_pos).withFrame(env, *this).debugThrow<EvalError>();
state.error<EvalError>("cannot add %1% to an integer", showType(vTmp)).atPos(i_pos).withFrame(env, *this).debugThrow();
} else if (firstType == nFloat) {
if (vTmp.type() == nInt) {
nf += vTmp.integer;
} else if (vTmp.type() == nFloat) {
nf += vTmp.fpoint;
} else
state.error("cannot add %1% to a float", showType(vTmp)).atPos(i_pos).withFrame(env, *this).debugThrow<EvalError>();
state.error<EvalError>("cannot add %1% to a float", showType(vTmp)).atPos(i_pos).withFrame(env, *this).debugThrow();
} else {
if (s.empty()) s.reserve(es->size());
/* skip canonization of first path, which would only be not
@ -2066,7 +2029,7 @@ void ExprConcatStrings::eval(EvalState & state, Env & env, Value & v)
v.mkFloat(nf);
else if (firstType == nPath) {
if (!context.empty())
state.error("a string that refers to a store path cannot be appended to a path").atPos(pos).withFrame(env, *this).debugThrow<EvalError>();
state.error<EvalError>("a string that refers to a store path cannot be appended to a path").atPos(pos).withFrame(env, *this).debugThrow();
v.mkPath(CanonPath(canonPath(str())));
} else
v.mkStringMove(c_str(), context);
@ -2081,8 +2044,9 @@ 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>();
state.error<InfiniteRecursionError>("infinite recursion encountered")
.atPos(v.determinePos(noPos))
.debugThrow();
}
// always force this to be separate, otherwise forceValue may inline it and take
@ -2096,7 +2060,7 @@ void EvalState::tryFixupBlackHolePos(Value & v, PosIdx pos)
try {
std::rethrow_exception(e);
} catch (InfiniteRecursionError & e) {
e.err.errPos = positions[pos];
e.atPos(positions[pos]);
} catch (...) {
}
}
@ -2144,15 +2108,18 @@ NixInt EvalState::forceInt(Value & v, const PosIdx pos, std::string_view errorCt
try {
forceValue(v, pos);
if (v.type() != nInt)
error("expected an integer but found %1%: %2%",
error<TypeError>(
"expected an integer but found %1%: %2%",
showType(v),
ValuePrinter(*this, v, errorPrintOptions))
.debugThrow<TypeError>();
ValuePrinter(*this, v, errorPrintOptions)
).atPos(pos).debugThrow();
return v.integer;
} catch (Error & e) {
e.addTrace(positions[pos], errorCtx);
throw;
}
return v.integer;
}
@ -2163,10 +2130,11 @@ NixFloat EvalState::forceFloat(Value & v, const PosIdx pos, std::string_view err
if (v.type() == nInt)
return v.integer;
else if (v.type() != nFloat)
error("expected a float but found %1%: %2%",
error<TypeError>(
"expected a float but found %1%: %2%",
showType(v),
ValuePrinter(*this, v, errorPrintOptions))
.debugThrow<TypeError>();
ValuePrinter(*this, v, errorPrintOptions)
).atPos(pos).debugThrow();
return v.fpoint;
} catch (Error & e) {
e.addTrace(positions[pos], errorCtx);
@ -2180,15 +2148,18 @@ bool EvalState::forceBool(Value & v, const PosIdx pos, std::string_view errorCtx
try {
forceValue(v, pos);
if (v.type() != nBool)
error("expected a Boolean but found %1%: %2%",
error<TypeError>(
"expected a Boolean but found %1%: %2%",
showType(v),
ValuePrinter(*this, v, errorPrintOptions))
.debugThrow<TypeError>();
ValuePrinter(*this, v, errorPrintOptions)
).atPos(pos).debugThrow();
return v.boolean;
} catch (Error & e) {
e.addTrace(positions[pos], errorCtx);
throw;
}
return v.boolean;
}
@ -2203,10 +2174,11 @@ void EvalState::forceFunction(Value & v, const PosIdx pos, std::string_view erro
try {
forceValue(v, pos);
if (v.type() != nFunction && !isFunctor(v))
error("expected a function but found %1%: %2%",
error<TypeError>(
"expected a function but found %1%: %2%",
showType(v),
ValuePrinter(*this, v, errorPrintOptions))
.debugThrow<TypeError>();
ValuePrinter(*this, v, errorPrintOptions)
).atPos(pos).debugThrow();
} catch (Error & e) {
e.addTrace(positions[pos], errorCtx);
throw;
@ -2219,10 +2191,11 @@ std::string_view EvalState::forceString(Value & v, const PosIdx pos, std::string
try {
forceValue(v, pos);
if (v.type() != nString)
error("expected a string but found %1%: %2%",
error<TypeError>(
"expected a string but found %1%: %2%",
showType(v),
ValuePrinter(*this, v, errorPrintOptions))
.debugThrow<TypeError>();
ValuePrinter(*this, v, errorPrintOptions)
).atPos(pos).debugThrow();
return v.string.s;
} catch (Error & e) {
e.addTrace(positions[pos], errorCtx);
@ -2251,7 +2224,7 @@ std::string_view EvalState::forceStringNoCtx(Value & v, const PosIdx pos, std::s
{
auto s = forceString(v, pos, errorCtx);
if (v.string.context) {
error("the string '%1%' is not allowed to refer to a store path (such as '%2%')", v.string.s, v.string.context[0]).withTrace(pos, errorCtx).debugThrow<EvalError>();
error<EvalError>("the string '%1%' is not allowed to refer to a store path (such as '%2%')", v.string.s, v.string.context[0]).withTrace(pos, errorCtx).debugThrow();
}
return s;
}
@ -2316,11 +2289,13 @@ BackedStringView EvalState::coerceToString(
return std::move(*maybeString);
auto i = v.attrs->find(sOutPath);
if (i == v.attrs->end()) {
error("cannot coerce %1% to a string: %2%",
error<TypeError>(
"cannot coerce %1% to a string: %2%",
showType(v),
ValuePrinter(*this, v, errorPrintOptions))
ValuePrinter(*this, v, errorPrintOptions)
)
.withTrace(pos, errorCtx)
.debugThrow<TypeError>();
.debugThrow();
}
return coerceToString(pos, *i->value, context, errorCtx,
coerceMore, copyToStore, canonicalizePath);
@ -2328,7 +2303,7 @@ BackedStringView EvalState::coerceToString(
if (v.type() == nExternal) {
try {
return v.external->coerceToString(positions[pos], context, coerceMore, copyToStore);
return v.external->coerceToString(*this, pos, context, coerceMore, copyToStore);
} catch (Error & e) {
e.addTrace(nullptr, errorCtx);
throw;
@ -2364,18 +2339,19 @@ BackedStringView EvalState::coerceToString(
}
}
error("cannot coerce %1% to a string: %2%",
error<TypeError>("cannot coerce %1% to a string: %2%",
showType(v),
ValuePrinter(*this, v, errorPrintOptions))
ValuePrinter(*this, v, errorPrintOptions)
)
.withTrace(pos, errorCtx)
.debugThrow<TypeError>();
.debugThrow();
}
StorePath EvalState::copyPathToStore(NixStringContext & context, const SourcePath & path)
{
if (nix::isDerivation(path.path.abs()))
error("file names are not allowed to end in '%1%'", drvExtension).debugThrow<EvalError>();
error<EvalError>("file names are not allowed to end in '%1%'", drvExtension).debugThrow();
auto i = srcToStore.find(path);
@ -2400,7 +2376,7 @@ SourcePath EvalState::coerceToPath(const PosIdx pos, Value & v, NixStringContext
{
auto path = coerceToString(pos, v, context, errorCtx, false, false, true).toOwned();
if (path == "" || path[0] != '/')
error("string '%1%' doesn't represent an absolute path", path).withTrace(pos, errorCtx).debugThrow<EvalError>();
error<EvalError>("string '%1%' doesn't represent an absolute path", path).withTrace(pos, errorCtx).debugThrow();
return CanonPath(path);
}
@ -2410,7 +2386,7 @@ StorePath EvalState::coerceToStorePath(const PosIdx pos, Value & v, NixStringCon
auto path = coerceToString(pos, v, context, errorCtx, false, false, true).toOwned();
if (auto storePath = store->maybeParseStorePath(path))
return *storePath;
error("path '%1%' is not in the Nix store", path).withTrace(pos, errorCtx).debugThrow<EvalError>();
error<EvalError>("path '%1%' is not in the Nix store", path).withTrace(pos, errorCtx).debugThrow();
}
@ -2420,18 +2396,18 @@ std::pair<SingleDerivedPath, std::string_view> EvalState::coerceToSingleDerivedP
auto s = forceString(v, context, pos, errorCtx);
auto csize = context.size();
if (csize != 1)
error(
error<EvalError>(
"string '%s' has %d entries in its context. It should only have exactly one entry",
s, csize)
.withTrace(pos, errorCtx).debugThrow<EvalError>();
.withTrace(pos, errorCtx).debugThrow();
auto derivedPath = std::visit(overloaded {
[&](NixStringContextElem::Opaque && o) -> SingleDerivedPath {
return std::move(o);
},
[&](NixStringContextElem::DrvDeep &&) -> SingleDerivedPath {
error(
error<EvalError>(
"string '%s' has a context which refers to a complete source and binary closure. This is not supported at this time",
s).withTrace(pos, errorCtx).debugThrow<EvalError>();
s).withTrace(pos, errorCtx).debugThrow();
},
[&](NixStringContextElem::Built && b) -> SingleDerivedPath {
return std::move(b);
@ -2454,16 +2430,16 @@ SingleDerivedPath EvalState::coerceToSingleDerivedPath(const PosIdx pos, Value &
error message. */
std::visit(overloaded {
[&](const SingleDerivedPath::Opaque & o) {
error(
error<EvalError>(
"path string '%s' has context with the different path '%s'",
s, sExpected)
.withTrace(pos, errorCtx).debugThrow<EvalError>();
.withTrace(pos, errorCtx).debugThrow();
},
[&](const SingleDerivedPath::Built & b) {
error(
error<EvalError>(
"string '%s' has context with the output '%s' from derivation '%s', but the string is not the right placeholder for this derivation output. It should be '%s'",
s, b.output, b.drvPath->to_string(*store), sExpected)
.withTrace(pos, errorCtx).debugThrow<EvalError>();
.withTrace(pos, errorCtx).debugThrow();
}
}, derivedPath.raw());
}
@ -2545,7 +2521,7 @@ bool EvalState::eqValues(Value & v1, Value & v2, const PosIdx pos, std::string_v
case nThunk: // Must not be left by forceValue
default:
error("cannot compare %1% with %2%", showType(v1), showType(v2)).withTrace(pos, errorCtx).debugThrow<EvalError>();
error<EvalError>("cannot compare %1% with %2%", showType(v1), showType(v2)).withTrace(pos, errorCtx).debugThrow();
}
}
@ -2782,13 +2758,12 @@ SourcePath EvalState::findFile(const SearchPath & searchPath, const std::string_
if (hasPrefix(path, "nix/"))
return CanonPath(concatStrings(corepkgsPrefix, path.substr(4)));
debugThrow(ThrownError({
.msg = hintfmt(evalSettings.pureEval
error<ThrownError>(
evalSettings.pureEval
? "cannot look up '<%s>' in pure evaluation mode (use '--impure' to override)"
: "file '%s' was not found in the Nix search path (add it using $NIX_PATH or -I)",
path),
.errPos = positions[pos]
}), 0, 0);
path
).atPos(pos).debugThrow();
}
@ -2858,11 +2833,11 @@ Expr * EvalState::parse(
}
std::string ExternalValueBase::coerceToString(const Pos & pos, NixStringContext & context, bool copyMore, bool copyToStore) const
std::string ExternalValueBase::coerceToString(EvalState & state, const PosIdx & pos, NixStringContext & context, bool copyMore, bool copyToStore) const
{
throw TypeError({
.msg = hintfmt("cannot coerce %1% to a string: %2%", showType(), *this)
});
state.error<TypeError>(
"cannot coerce %1% to a string: %2%", showType(), *this
).atPos(pos).debugThrow();
}

90
src/libexpr/eval.hh
View file

@ -2,6 +2,7 @@
///@file
#include "attr-set.hh"
#include "eval-error.hh"
#include "types.hh"
#include "value.hh"
#include "nixexpr.hh"
@ -150,45 +151,6 @@ struct DebugTrace {
bool isError;
};
void debugError(Error * e, Env & env, Expr & expr);
class ErrorBuilder
{
private:
EvalState & state;
ErrorInfo info;
ErrorBuilder(EvalState & s, ErrorInfo && i): state(s), info(i) { }
public:
template<typename... Args>
[[nodiscard, gnu::noinline]]
static ErrorBuilder * create(EvalState & s, const Args & ... args)
{
return new ErrorBuilder(s, ErrorInfo { .msg = hintfmt(args...) });
}
[[nodiscard, gnu::noinline]]
ErrorBuilder & atPos(PosIdx pos);
[[nodiscard, gnu::noinline]]
ErrorBuilder & withTrace(PosIdx pos, const std::string_view text);
[[nodiscard, gnu::noinline]]
ErrorBuilder & withFrameTrace(PosIdx pos, const std::string_view text);
[[nodiscard, gnu::noinline]]
ErrorBuilder & withSuggestions(Suggestions & s);
[[nodiscard, gnu::noinline]]
ErrorBuilder & withFrame(const Env & e, const Expr & ex);
template<class ErrorType>
[[gnu::noinline, gnu::noreturn]]
void debugThrow();
};
class EvalState : public std::enable_shared_from_this<EvalState>
{
public:
@ -262,39 +224,10 @@ public:
void runDebugRepl(const Error * error, const Env & env, const Expr & expr);
template<class E>
[[gnu::noinline, gnu::noreturn]]
void debugThrowLastTrace(E && error)
{
debugThrow(error, nullptr, nullptr);
}
template<class E>
[[gnu::noinline, gnu::noreturn]]
void debugThrow(E && error, const Env * env, const Expr * expr)
{
if (debugRepl && ((env && expr) || !debugTraces.empty())) {
if (!env || !expr) {
const DebugTrace & last = debugTraces.front();
env = &last.env;
expr = &last.expr;
}
runDebugRepl(&error, *env, *expr);
}
throw std::move(error);
}
// This is dangerous, but gets in line with the idea that error creation and
// throwing should not allocate on the stack of hot functions.
// as long as errors are immediately thrown, it works.
ErrorBuilder * errorBuilder;
template<typename... Args>
template<class T, typename... Args>
[[nodiscard, gnu::noinline]]
ErrorBuilder & error(const Args & ... args) {
errorBuilder = ErrorBuilder::create(*this, args...);
return *errorBuilder;
EvalErrorBuilder<T> & error(const Args & ... args) {
return *new EvalErrorBuilder<T>(*this, args...);
}
private:
@ -840,23 +773,8 @@ std::string showType(const Value & v);
*/
SourcePath resolveExprPath(SourcePath path);
struct InvalidPathError : EvalError
{
Path path;
InvalidPathError(const Path & path);
#ifdef EXCEPTION_NEEDS_THROW_SPEC
~InvalidPathError() throw () { };
#endif
};
static const std::string corepkgsPrefix{"/__corepkgs__/"};
template<class ErrorType>
void ErrorBuilder::debugThrow()
{
// NOTE: We always use the -LastTrace version as we push the new trace in withFrame()
state.debugThrowLastTrace(ErrorType(info));
}
}

16
src/libexpr/flake/flake.cc
View file

@ -140,8 +140,8 @@ static FlakeInput parseFlakeInput(EvalState & state,
attrs.emplace(state.symbols[attr.name], (long unsigned int)attr.value->integer);
break;
default:
throw TypeError("flake input attribute '%s' is %s while a string, Boolean, or integer is expected",
state.symbols[attr.name], showType(*attr.value));
state.error<TypeError>("flake input attribute '%s' is %s while a string, Boolean, or integer is expected",
state.symbols[attr.name], showType(*attr.value)).debugThrow();
}
#pragma GCC diagnostic pop
}
@ -288,15 +288,15 @@ static Flake getFlake(
std::vector<std::string> ss;
for (auto elem : setting.value->listItems()) {
if (elem->type() != nString)
throw TypeError("list element in flake configuration setting '%s' is %s while a string is expected",
state.symbols[setting.name], showType(*setting.value));
state.error<TypeError>("list element in flake configuration setting '%s' is %s while a string is expected",
state.symbols[setting.name], showType(*setting.value)).debugThrow();
ss.emplace_back(state.forceStringNoCtx(*elem, setting.pos, ""));
}
flake.config.settings.emplace(state.symbols[setting.name], ss);
}
else
throw TypeError("flake configuration setting '%s' is %s",
state.symbols[setting.name], showType(*setting.value));
state.error<TypeError>("flake configuration setting '%s' is %s",
state.symbols[setting.name], showType(*setting.value)).debugThrow();
}
}
@ -857,11 +857,11 @@ static void prim_flakeRefToString(
attrs.emplace(state.symbols[attr.name],
std::string(attr.value->str()));
} else {
state.error(
state.error<EvalError>(
"flake reference attribute sets may only contain integers, Booleans, "
"and strings, but attribute '%s' is %s",
state.symbols[attr.name],
showType(*attr.value)).debugThrow<EvalError>();
showType(*attr.value)).debugThrow();
}
}
auto flakeRef = FlakeRef::fromAttrs(attrs);

5
src/libexpr/get-drvs.cc
View file

@ -50,7 +50,7 @@ std::string DrvInfo::queryName() const
{
if (name == "" && attrs) {
auto i = attrs->find(state->sName);
if (i == attrs->end()) throw TypeError("derivation name missing");
if (i == attrs->end()) state->error<TypeError>("derivation name missing").debugThrow();
name = state->forceStringNoCtx(*i->value, noPos, "while evaluating the 'name' attribute of a derivation");
}
return name;
@ -397,7 +397,8 @@ static void getDerivations(EvalState & state, Value & vIn,
}
}
else throw TypeError("expression does not evaluate to a derivation (or a set or list of those)");
else
state.error<TypeError>("expression does not evaluate to a derivation (or a set or list of those)").debugThrow();
}

4
src/libexpr/json-to-value.cc
View file

@ -1,4 +1,6 @@
#include "json-to-value.hh"
#include "value.hh"
#include "eval.hh"
#include <variant>
#include <nlohmann/json.hpp>
@ -159,7 +161,7 @@ public:
}
bool parse_error(std::size_t, const std::string&, const nlohmann::detail::exception& ex) {
throw JSONParseError(ex.what());
throw JSONParseError("%s", ex.what());
}
};

7
src/libexpr/json-to-value.hh
View file

@ -1,13 +1,16 @@
#pragma once
///@file
#include "eval.hh"
#include "error.hh"
#include <string>
namespace nix {
MakeError(JSONParseError, EvalError);
class EvalState;
struct Value;
MakeError(JSONParseError, Error);
void parseJSON(EvalState & state, const std::string_view & s, Value & v);

12
src/libexpr/lexer.l
View file

@ -152,9 +152,9 @@ or { return OR_KW; }
try {
yylval->n = boost::lexical_cast<int64_t>(yytext);
} catch (const boost::bad_lexical_cast &) {
throw ParseError({
throw ParseError(ErrorInfo{
.msg = hintfmt("invalid integer '%1%'", yytext),
.errPos = state->positions[CUR_POS],
.pos = state->positions[CUR_POS],
});
}
return INT;
@ -162,9 +162,9 @@ or { return OR_KW; }
{FLOAT} { errno = 0;
yylval->nf = strtod(yytext, 0);
if (errno != 0)
throw ParseError({
throw ParseError(ErrorInfo{
.msg = hintfmt("invalid float '%1%'", yytext),
.errPos = state->positions[CUR_POS],
.pos = state->positions[CUR_POS],
});
return FLOAT;
}
@ -291,9 +291,9 @@ or { return OR_KW; }
<INPATH_SLASH>{ANY} |
<INPATH_SLASH><<EOF>> {
throw ParseError({
throw ParseError(ErrorInfo{
.msg = hintfmt("path has a trailing slash"),
.errPos = state->positions[CUR_POS],
.pos = state->positions[CUR_POS],
});
}

8
src/libexpr/nixexpr.cc
View file

@ -294,10 +294,10 @@ void ExprVar::bindVars(EvalState & es, const std::shared_ptr<const StaticEnv> &
enclosing `with'. If there is no `with', then we can issue an
"undefined variable" error now. */
if (withLevel == -1)
throw UndefinedVarError({
.msg = hintfmt("undefined variable '%1%'", es.symbols[name]),
.errPos = es.positions[pos]
});
es.error<UndefinedVarError>(
"undefined variable '%1%'",
es.symbols[name]
).atPos(pos).debugThrow();
for (auto * e = env.get(); e && !fromWith; e = e->up)
fromWith = e->isWith;
this->level = withLevel;

18
src/libexpr/nixexpr.hh
View file

@ -9,29 +9,13 @@
#include "error.hh"
#include "chunked-vector.hh"
#include "position.hh"
#include "eval-error.hh"
#include "pos-idx.hh"
#include "pos-table.hh"
namespace nix {
MakeError(EvalError, Error);
MakeError(ParseError, Error);
MakeError(AssertionError, EvalError);
MakeError(ThrownError, AssertionError);
MakeError(Abort, EvalError);
MakeError(TypeError, EvalError);
MakeError(UndefinedVarError, Error);
MakeError(MissingArgumentError, EvalError);
MakeError(RestrictedPathError, Error);
class InfiniteRecursionError : public EvalError
{
friend class EvalState;
public:
using EvalError::EvalError;
};
struct Env;
struct Value;
class EvalState;

8
src/libexpr/parser-state.hh
View file

@ -65,7 +65,7 @@ inline void ParserState::dupAttr(const AttrPath & attrPath, const PosIdx pos, co
throw ParseError({
.msg = hintfmt("attribute '%1%' already defined at %2%",
showAttrPath(symbols, attrPath), positions[prevPos]),
.errPos = positions[pos]
.pos = positions[pos]
});
}
@ -73,7 +73,7 @@ inline void ParserState::dupAttr(Symbol attr, const PosIdx pos, const PosIdx pre
{
throw ParseError({
.msg = hintfmt("attribute '%1%' already defined at %2%", symbols[attr], positions[prevPos]),
.errPos = positions[pos]
.pos = positions[pos]
});
}
@ -154,13 +154,13 @@ inline Formals * ParserState::validateFormals(Formals * formals, PosIdx pos, Sym
if (duplicate)
throw ParseError({
.msg = hintfmt("duplicate formal function argument '%1%'", symbols[duplicate->first]),
.errPos = positions[duplicate->second]
.pos = positions[duplicate->second]
});
if (arg && formals->has(arg))
throw ParseError({
.msg = hintfmt("duplicate formal function argument '%1%'", symbols[arg]),
.errPos = positions[pos]
.pos = positions[pos]
});
return formals;

8
src/libexpr/parser.y
View file

@ -64,7 +64,7 @@ void yyerror(YYLTYPE * loc, yyscan_t scanner, ParserState * state, const char *
{
throw ParseError({
.msg = hintfmt(error),
.errPos = state->positions[state->at(*loc)]
.pos = state->positions[state->at(*loc)]
});
}
@ -153,7 +153,7 @@ expr_function
{ if (!$2->dynamicAttrs.empty())
throw ParseError({
.msg = hintfmt("dynamic attributes not allowed in let"),
.errPos = state->positions[CUR_POS]
.pos = state->positions[CUR_POS]
});
$$ = new ExprLet($2, $4);
}
@ -243,7 +243,7 @@ expr_simple
if (noURLLiterals)
throw ParseError({
.msg = hintfmt("URL literals are disabled"),
.errPos = state->positions[CUR_POS]
.pos = state->positions[CUR_POS]
});
$$ = new ExprString(std::string($1));
}
@ -339,7 +339,7 @@ attrs
} else
throw ParseError({
.msg = hintfmt("dynamic attributes not allowed in inherit"),
.errPos = state->positions[state->at(@2)]
.pos = state->positions[state->at(@2)]
});
}
| { $$ = new AttrPath; }

244
src/libexpr/primops.cc
View file

@ -37,10 +37,6 @@ namespace nix {
* Miscellaneous
*************************************************************/
InvalidPathError::InvalidPathError(const Path & path) :
EvalError("path '%s' is not valid", path), path(path) {}
StringMap EvalState::realiseContext(const NixStringContext & context)
{
std::vector<DerivedPath::Built> drvs;
@ -49,7 +45,7 @@ StringMap EvalState::realiseContext(const NixStringContext & context)
for (auto & c : context) {
auto ensureValid = [&](const StorePath & p) {
if (!store->isValidPath(p))
debugThrowLastTrace(InvalidPathError(store->printStorePath(p)));
error<InvalidPathError>(store->printStorePath(p)).debugThrow();
};
std::visit(overloaded {
[&](const NixStringContextElem::Built & b) {
@ -76,9 +72,10 @@ StringMap EvalState::realiseContext(const NixStringContext & context)
if (drvs.empty()) return {};
if (!evalSettings.enableImportFromDerivation)
debugThrowLastTrace(Error(
error<EvalError>(
"cannot build '%1%' during evaluation because the option 'allow-import-from-derivation' is disabled",
drvs.begin()->to_string(*store)));
drvs.begin()->to_string(*store)
).debugThrow();
/* Build/substitute the context. */
std::vector<DerivedPath> buildReqs;
@ -345,16 +342,16 @@ void prim_importNative(EvalState & state, const PosIdx pos, Value * * args, Valu
void *handle = dlopen(path.path.c_str(), RTLD_LAZY | RTLD_LOCAL);
if (!handle)
state.debugThrowLastTrace(EvalError("could not open '%1%': %2%", path, dlerror()));
state.error<EvalError>("could not open '%1%': %2%", path, dlerror()).debugThrow();
dlerror();
ValueInitializer func = (ValueInitializer) dlsym(handle, sym.c_str());
if(!func) {
char *message = dlerror();
if (message)
state.debugThrowLastTrace(EvalError("could not load symbol '%1%' from '%2%': %3%", sym, path, message));
state.error<EvalError>("could not load symbol '%1%' from '%2%': %3%", sym, path, message).debugThrow();
else
state.debugThrowLastTrace(EvalError("symbol '%1%' from '%2%' resolved to NULL when a function pointer was expected", sym, path));
state.error<EvalError>("symbol '%1%' from '%2%' resolved to NULL when a function pointer was expected", sym, path).debugThrow();
}
(func)(state, v);
@ -370,7 +367,7 @@ void prim_exec(EvalState & state, const PosIdx pos, Value * * args, Value & v)
auto elems = args[0]->listElems();
auto count = args[0]->listSize();
if (count == 0)
state.error("at least one argument to 'exec' required").atPos(pos).debugThrow<EvalError>();
state.error<EvalError>("at least one argument to 'exec' required").atPos(pos).debugThrow();
NixStringContext context;
auto program = state.coerceToString(pos, *elems[0], context,
"while evaluating the first element of the argument passed to builtins.exec",
@ -385,7 +382,7 @@ void prim_exec(EvalState & state, const PosIdx pos, Value * * args, Value & v)
try {
auto _ = state.realiseContext(context); // FIXME: Handle CA derivations
} catch (InvalidPathError & e) {
state.error("cannot execute '%1%', since path '%2%' is not valid", program, e.path).atPos(pos).debugThrow<EvalError>();
state.error<EvalError>("cannot execute '%1%', since path '%2%' is not valid", program, e.path).atPos(pos).debugThrow();
}
auto output = runProgram(program, true, commandArgs);
@ -587,7 +584,7 @@ struct CompareValues
if (v1->type() == nInt && v2->type() == nFloat)
return v1->integer < v2->fpoint;
if (v1->type() != v2->type())
state.error("cannot compare %s with %s", showType(*v1), showType(*v2)).debugThrow<EvalError>();
state.error<EvalError>("cannot compare %s with %s", showType(*v1), showType(*v2)).debugThrow();
// Allow selecting a subset of enum values
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wswitch-enum"
@ -612,7 +609,7 @@ struct CompareValues
}
}
default:
state.error("cannot compare %s with %s; values of that type are incomparable", showType(*v1), showType(*v2)).debugThrow<EvalError>();
state.error<EvalError>("cannot compare %s with %s; values of that type are incomparable", showType(*v1), showType(*v2)).debugThrow();
#pragma GCC diagnostic pop
}
} catch (Error & e) {
@ -639,7 +636,7 @@ static Bindings::iterator getAttr(
{
Bindings::iterator value = attrSet->find(attrSym);
if (value == attrSet->end()) {
state.error("attribute '%s' missing", state.symbols[attrSym]).withTrace(noPos, errorCtx).debugThrow<TypeError>();
state.error<TypeError>("attribute '%s' missing", state.symbols[attrSym]).withTrace(noPos, errorCtx).debugThrow();
}
return value;
}
@ -752,7 +749,7 @@ static RegisterPrimOp primop_break({
auto error = Error(ErrorInfo {
.level = lvlInfo,
.msg = hintfmt("breakpoint reached"),
.errPos = state.positions[pos],
.pos = state.positions[pos],
});
auto & dt = state.debugTraces.front();
@ -763,7 +760,7 @@ static RegisterPrimOp primop_break({
throw Error(ErrorInfo{
.level = lvlInfo,
.msg = hintfmt("quit the debugger"),
.errPos = nullptr,
.pos = nullptr,
});
}
}
@ -784,7 +781,7 @@ static RegisterPrimOp primop_abort({
NixStringContext context;
auto s = state.coerceToString(pos, *args[0], context,
"while evaluating the error message passed to builtins.abort").toOwned();
state.debugThrowLastTrace(Abort("evaluation aborted with the following error message: '%1%'", s));
state.error<Abort>("evaluation aborted with the following error message: '%1%'", s).debugThrow();
}
});
@ -803,7 +800,7 @@ static RegisterPrimOp primop_throw({
NixStringContext context;
auto s = state.coerceToString(pos, *args[0], context,
"while evaluating the error message passed to builtin.throw").toOwned();
state.debugThrowLastTrace(ThrownError(s));
state.error<ThrownError>(s).debugThrow();
}
});
@ -1122,37 +1119,33 @@ drvName, Bindings * attrs, Value & v)
experimentalFeatureSettings.require(Xp::DynamicDerivations);
ingestionMethod = TextIngestionMethod {};
} else
state.debugThrowLastTrace(EvalError({
.msg = hintfmt("invalid value '%s' for 'outputHashMode' attribute", s),
.errPos = state.positions[noPos]
}));
state.error<EvalError>(
"invalid value '%s' for 'outputHashMode' attribute", s
).atPos(v).debugThrow();
};
auto handleOutputs = [&](const Strings & ss) {
outputs.clear();
for (auto & j : ss) {
if (outputs.find(j) != outputs.end())
state.debugThrowLastTrace(EvalError({
.msg = hintfmt("duplicate derivation output '%1%'", j),
.errPos = state.positions[noPos]
}));
state.error<EvalError>("duplicate derivation output '%1%'", j)
.atPos(v)
.debugThrow();
/* !!! Check whether j is a valid attribute
name. */
/* Derivations cannot be named ‘drv’, because
then we'd have an attribute ‘drvPath’ in
the resulting set. */
if (j == "drv")
state.debugThrowLastTrace(EvalError({
.msg = hintfmt("invalid derivation output name 'drv'" ),
.errPos = state.positions[noPos]
}));
state.error<EvalError>("invalid derivation output name 'drv'")
.atPos(v)
.debugThrow();
outputs.insert(j);
}
if (outputs.empty())
state.debugThrowLastTrace(EvalError({
.msg = hintfmt("derivation cannot have an empty set of outputs"),
.errPos = state.positions[noPos]
}));
state.error<EvalError>("derivation cannot have an empty set of outputs")
.atPos(v)
.debugThrow();
};
try {
@ -1275,16 +1268,14 @@ drvName, Bindings * attrs, Value & v)
/* Do we have all required attributes? */
if (drv.builder == "")
state.debugThrowLastTrace(EvalError({
.msg = hintfmt("required attribute 'builder' missing"),
.errPos = state.positions[noPos]
}));
state.error<EvalError>("required attribute 'builder' missing")
.atPos(v)
.debugThrow();
if (drv.platform == "")
state.debugThrowLastTrace(EvalError({
.msg = hintfmt("required attribute 'system' missing"),
.errPos = state.positions[noPos]
}));
state.error<EvalError>("required attribute 'system' missing")
.atPos(v)
.debugThrow();
/* Check whether the derivation name is valid. */
if (isDerivation(drvName) &&
@ -1292,10 +1283,10 @@ drvName, Bindings * attrs, Value & v)
outputs.size() == 1 &&
*(outputs.begin()) == "out"))
{
state.debugThrowLastTrace(EvalError({
.msg = hintfmt("derivation names are allowed to end in '%s' only if they produce a single derivation file", drvExtension),
.errPos = state.positions[noPos]
}));
state.error<EvalError>(
"derivation names are allowed to end in '%s' only if they produce a single derivation file",
drvExtension
).atPos(v).debugThrow();
}
if (outputHash) {
@ -1304,10 +1295,9 @@ drvName, Bindings * attrs, Value & v)
Ignore `__contentAddressed` because fixed output derivations are
already content addressed. */
if (outputs.size() != 1 || *(outputs.begin()) != "out")
state.debugThrowLastTrace(Error({
.msg = hintfmt("multiple outputs are not supported in fixed-output derivations"),
.errPos = state.positions[noPos]
}));
state.error<EvalError>(
"multiple outputs are not supported in fixed-output derivations"
).atPos(v).debugThrow();
auto h = newHashAllowEmpty(*outputHash, parseHashTypeOpt(outputHashAlgo));
@ -1326,10 +1316,8 @@ drvName, Bindings * attrs, Value & v)
else if (contentAddressed || isImpure) {
if (contentAddressed && isImpure)
throw EvalError({
.msg = hintfmt("derivation cannot be both content-addressed and impure"),
.errPos = state.positions[noPos]
});
state.error<EvalError>("derivation cannot be both content-addressed and impure")
.atPos(v).debugThrow();
auto ht = parseHashTypeOpt(outputHashAlgo).value_or(htSHA256);
auto method = ingestionMethod.value_or(FileIngestionMethod::Recursive);
@ -1370,10 +1358,10 @@ drvName, Bindings * attrs, Value & v)
for (auto & i : outputs) {
auto h = get(hashModulo.hashes, i);
if (!h)
throw AssertionError({
.msg = hintfmt("derivation produced no hash for output '%s'", i),
.errPos = state.positions[noPos],
});
state.error<AssertionError>(
"derivation produced no hash for output '%s'",
i
).atPos(v).debugThrow();
auto outPath = state.store->makeOutputPath(i, *h, drvName);
drv.env[i] = state.store->printStorePath(outPath);
drv.outputs.insert_or_assign(
@ -1479,10 +1467,10 @@ static RegisterPrimOp primop_toPath({
static void prim_storePath(EvalState & state, const PosIdx pos, Value * * args, Value & v)
{
if (evalSettings.pureEval)
state.debugThrowLastTrace(EvalError({
.msg = hintfmt("'%s' is not allowed in pure evaluation mode", "builtins.storePath"),
.errPos = state.positions[pos]
}));
state.error<EvalError>(
"'%s' is not allowed in pure evaluation mode",
"builtins.storePath"
).atPos(pos).debugThrow();
NixStringContext context;
auto path = state.checkSourcePath(state.coerceToPath(pos, *args[0], context, "while evaluating the first argument passed to builtins.storePath")).path;
@ -1492,10 +1480,8 @@ static void prim_storePath(EvalState & state, const PosIdx pos, Value * * args,
if (!state.store->isStorePath(path.abs()))
path = CanonPath(canonPath(path.abs(), true));
if (!state.store->isInStore(path.abs()))
state.debugThrowLastTrace(EvalError({
.msg = hintfmt("path '%1%' is not in the Nix store", path),
.errPos = state.positions[pos]
}));
state.error<EvalError>("path '%1%' is not in the Nix store", path)
.atPos(pos).debugThrow();
auto path2 = state.store->toStorePath(path.abs()).first;
if (!settings.readOnlyMode)
state.store->ensurePath(path2);
@ -1623,7 +1609,10 @@ static void prim_readFile(EvalState & state, const PosIdx pos, Value * * args, V
auto path = realisePath(state, pos, *args[0]);
auto s = path.readFile();
if (s.find((char) 0) != std::string::npos)
state.debugThrowLastTrace(Error("the contents of the file '%1%' cannot be represented as a Nix string", path));
state.error<EvalError>(
"the contents of the file '%1%' cannot be represented as a Nix string",
path
).atPos(pos).debugThrow();
StorePathSet refs;
if (state.store->isInStore(path.path.abs())) {
try {
@ -1680,10 +1669,11 @@ static void prim_findFile(EvalState & state, const PosIdx pos, Value * * args, V
auto rewrites = state.realiseContext(context);
path = rewriteStrings(path, rewrites);
} catch (InvalidPathError & e) {
state.debugThrowLastTrace(EvalError({
.msg = hintfmt("cannot find '%1%', since path '%2%' is not valid", path, e.path),
.errPos = state.positions[pos]
}));
state.error<EvalError>(
"cannot find '%1%', since path '%2%' is not valid",
path,
e.path
).atPos(pos).debugThrow();
}
searchPath.elements.emplace_back(SearchPath::Elem {
@ -1752,10 +1742,7 @@ static void prim_hashFile(EvalState & state, const PosIdx pos, Value * * args, V
auto type = state.forceStringNoCtx(*args[0], pos, "while evaluating the first argument passed to builtins.hashFile");
std::optional<HashType> ht = parseHashType(type);
if (!ht)
state.debugThrowLastTrace(Error({
.msg = hintfmt("unknown hash type '%1%'", type),
.errPos = state.positions[pos]
}));
state.error<EvalError>("unknown hash type '%1%'", type).atPos(pos).debugThrow();
auto path = realisePath(state, pos, *args[1]);
@ -2075,13 +2062,12 @@ static void prim_toFile(EvalState & state, const PosIdx pos, Value * * args, Val
if (auto p = std::get_if<NixStringContextElem::Opaque>(&c.raw))
refs.insert(p->path);
else
state.debugThrowLastTrace(EvalError({
.msg = hintfmt(
"in 'toFile': the file named '%1%' must not contain a reference "
"to a derivation but contains (%2%)",
name, c.to_string()),
.errPos = state.positions[pos]
}));
state.error<EvalError>(
"files created by %1% may not reference derivations, but %2% references %3%",
"builtins.toFile",
name,
c.to_string()
).atPos(pos).debugThrow();
}
auto storePath = settings.readOnlyMode
@ -2240,7 +2226,10 @@ static void addPath(
auto dstPath = fetchToStore(
*state.store, state.rootPath(CanonPath(path)), name, method, &filter, state.repair);
if (expectedHash && expectedStorePath != dstPath)
state.debugThrowLastTrace(Error("store path mismatch in (possibly filtered) path added from '%s'", path));
state.error<EvalError>(
"store path mismatch in (possibly filtered) path added from '%s'",
path
).atPos(pos).debugThrow();
state.allowAndSetStorePathString(dstPath, v);
} else
state.allowAndSetStorePathString(*expectedStorePath, v);
@ -2339,16 +2328,15 @@ static void prim_path(EvalState & state, const PosIdx pos, Value * * args, Value
else if (n == "sha256")
expectedHash = newHashAllowEmpty(state.forceStringNoCtx(*attr.value, attr.pos, "while evaluating the `sha256` attribute passed to builtins.path"), htSHA256);
else
state.debugThrowLastTrace(EvalError({
.msg = hintfmt("unsupported argument '%1%' to 'addPath'", state.symbols[attr.name]),
.errPos = state.positions[attr.pos]
}));
state.error<EvalError>(
"unsupported argument '%1%' to 'addPath'",
state.symbols[attr.name]
).atPos(attr.pos).debugThrow();
}
if (!path)
state.debugThrowLastTrace(EvalError({
.msg = hintfmt("missing required 'path' attribute in the first argument to builtins.path"),
.errPos = state.positions[pos]
}));
state.error<EvalError>(
"missing required 'path' attribute in the first argument to builtins.path"
).atPos(pos).debugThrow();
if (name.empty())
name = path->baseName();
@ -2766,10 +2754,7 @@ static void prim_functionArgs(EvalState & state, const PosIdx pos, Value * * arg
return;
}
if (!args[0]->isLambda())
state.debugThrowLastTrace(TypeError({
.msg = hintfmt("'functionArgs' requires a function"),
.errPos = state.positions[pos]
}));
state.error<TypeError>("'functionArgs' requires a function").atPos(pos).debugThrow();
if (!args[0]->lambda.fun->hasFormals()) {
v.mkAttrs(&state.emptyBindings);
@ -2939,10 +2924,10 @@ static void elemAt(EvalState & state, const PosIdx pos, Value & list, int n, Val
{
state.forceList(list, pos, "while evaluating the first argument passed to builtins.elemAt");
if (n < 0 || (unsigned int) n >= list.listSize())
state.debugThrowLastTrace(Error({
.msg = hintfmt("list index %1% is out of bounds", n),
.errPos = state.positions[pos]
}));
state.error<EvalError>(
"list index %1% is out of bounds",
n
).atPos(pos).debugThrow();
state.forceValue(*list.listElems()[n], pos);
v = *list.listElems()[n];
}
@ -2987,10 +2972,7 @@ static void prim_tail(EvalState & state, const PosIdx pos, Value * * args, Value
{
state.forceList(*args[0], pos, "while evaluating the first argument passed to builtins.tail");
if (args[0]->listSize() == 0)
state.debugThrowLastTrace(Error({
.msg = hintfmt("'tail' called on an empty list"),
.errPos = state.positions[pos]
}));
state.error<EvalError>("'tail' called on an empty list").atPos(pos).debugThrow();
state.mkList(v, args[0]->listSize() - 1);
for (unsigned int n = 0; n < v.listSize(); ++n)
@ -3240,7 +3222,7 @@ static void prim_genList(EvalState & state, const PosIdx pos, Value * * args, Va
auto len = state.forceInt(*args[1], pos, "while evaluating the second argument passed to builtins.genList");
if (len < 0)
state.error("cannot create list of size %1%", len).debugThrow<EvalError>();
state.error<EvalError>("cannot create list of size %1%", len).atPos(pos).debugThrow();
// More strict than striclty (!) necessary, but acceptable
// as evaluating map without accessing any values makes little sense.
@ -3557,10 +3539,7 @@ static void prim_div(EvalState & state, const PosIdx pos, Value * * args, Value
NixFloat f2 = state.forceFloat(*args[1], pos, "while evaluating the second operand of the division");
if (f2 == 0)
state.debugThrowLastTrace(EvalError({
.msg = hintfmt("division by zero"),
.errPos = state.positions[pos]
}));
state.error<EvalError>("division by zero").atPos(pos).debugThrow();
if (args[0]->type() == nFloat || args[1]->type() == nFloat) {
v.mkFloat(state.forceFloat(*args[0], pos, "while evaluating the first operand of the division") / f2);
@ -3569,10 +3548,7 @@ static void prim_div(EvalState & state, const PosIdx pos, Value * * args, Value
NixInt i2 = state.forceInt(*args[1], pos, "while evaluating the second operand of the division");
/* Avoid division overflow as it might raise SIGFPE. */
if (i1 == std::numeric_limits<NixInt>::min() && i2 == -1)
state.debugThrowLastTrace(EvalError({
.msg = hintfmt("overflow in integer division"),
.errPos = state.positions[pos]
}));
state.error<EvalError>("overflow in integer division").atPos(pos).debugThrow();
v.mkInt(i1 / i2);
}
@ -3703,10 +3679,7 @@ static void prim_substring(EvalState & state, const PosIdx pos, Value * * args,
int start = state.forceInt(*args[0], pos, "while evaluating the first argument (the start offset) passed to builtins.substring");
if (start < 0)
state.debugThrowLastTrace(EvalError({
.msg = hintfmt("negative start position in 'substring'"),
.errPos = state.positions[pos]
}));
state.error<EvalError>("negative start position in 'substring'").atPos(pos).debugThrow();
int len = state.forceInt(*args[1], pos, "while evaluating the second argument (the substring length) passed to builtins.substring");
@ -3770,10 +3743,7 @@ static void prim_hashString(EvalState & state, const PosIdx pos, Value * * args,
auto type = state.forceStringNoCtx(*args[0], pos, "while evaluating the first argument passed to builtins.hashString");
std::optional<HashType> ht = parseHashType(type);
if (!ht)
state.debugThrowLastTrace(Error({
.msg = hintfmt("unknown hash type '%1%'", type),
.errPos = state.positions[pos]
}));
state.error<EvalError>("unknown hash algorithm '%1%'", type).atPos(pos).debugThrow();
NixStringContext context; // discarded
auto s = state.forceString(*args[1], context, pos, "while evaluating the second argument passed to builtins.hashString");
@ -3843,15 +3813,13 @@ void prim_match(EvalState & state, const PosIdx pos, Value * * args, Value & v)
} catch (std::regex_error & e) {
if (e.code() == std::regex_constants::error_space) {
// limit is _GLIBCXX_REGEX_STATE_LIMIT for libstdc++
state.debugThrowLastTrace(EvalError({
.msg = hintfmt("memory limit exceeded by regular expression '%s'", re),
.errPos = state.positions[pos]
}));
state.error<EvalError>("memory limit exceeded by regular expression '%s'", re)
.atPos(pos)
.debugThrow();
} else
state.debugThrowLastTrace(EvalError({
.msg = hintfmt("invalid regular expression '%s'", re),
.errPos = state.positions[pos]
}));
state.error<EvalError>("invalid regular expression '%s'", re)
.atPos(pos)
.debugThrow();
}
}
@ -3947,15 +3915,13 @@ void prim_split(EvalState & state, const PosIdx pos, Value * * args, Value & v)
} catch (std::regex_error & e) {
if (e.code() == std::regex_constants::error_space) {
// limit is _GLIBCXX_REGEX_STATE_LIMIT for libstdc++
state.debugThrowLastTrace(EvalError({
.msg = hintfmt("memory limit exceeded by regular expression '%s'", re),
.errPos = state.positions[pos]
}));
state.error<EvalError>("memory limit exceeded by regular expression '%s'", re)
.atPos(pos)
.debugThrow();
} else
state.debugThrowLastTrace(EvalError({
.msg = hintfmt("invalid regular expression '%s'", re),
.errPos = state.positions[pos]
}));
state.error<EvalError>("invalid regular expression '%s'", re)
.atPos(pos)
.debugThrow();
}
}
@ -4031,7 +3997,9 @@ static void prim_replaceStrings(EvalState & state, const PosIdx pos, Value * * a
state.forceList(*args[0], pos, "while evaluating the first argument passed to builtins.replaceStrings");
state.forceList(*args[1], pos, "while evaluating the second argument passed to builtins.replaceStrings");
if (args[0]->listSize() != args[1]->listSize())
state.error("'from' and 'to' arguments passed to builtins.replaceStrings have different lengths").atPos(pos).debugThrow<EvalError>();
state.error<EvalError>(
"'from' and 'to' arguments passed to builtins.replaceStrings have different lengths"
).atPos(pos).debugThrow();
std::vector<std::string> from;
from.reserve(args[0]->listSize());

50
src/libexpr/primops/context.cc
View file

@ -98,30 +98,30 @@ static void prim_addDrvOutputDependencies(EvalState & state, const PosIdx pos, V
auto contextSize = context.size();
if (contextSize != 1) {
throw EvalError({
.msg = hintfmt("context of string '%s' must have exactly one element, but has %d", *s, contextSize),
.errPos = state.positions[pos]
});
state.error<EvalError>(
"context of string '%s' must have exactly one element, but has %d",
*s,
contextSize
).atPos(pos).debugThrow();
}
NixStringContext context2 {
(NixStringContextElem { std::visit(overloaded {
[&](const NixStringContextElem::Opaque & c) -> NixStringContextElem::DrvDeep {
if (!c.path.isDerivation()) {
throw EvalError({
.msg = hintfmt("path '%s' is not a derivation",
state.store->printStorePath(c.path)),
.errPos = state.positions[pos],
});
state.error<EvalError>(
"path '%s' is not a derivation",
state.store->printStorePath(c.path)
).atPos(pos).debugThrow();
}
return NixStringContextElem::DrvDeep {
.drvPath = c.path,
};
},
[&](const NixStringContextElem::Built & c) -> NixStringContextElem::DrvDeep {
throw EvalError({
.msg = hintfmt("`addDrvOutputDependencies` can only act on derivations, not on a derivation output such as '%1%'", c.output),
.errPos = state.positions[pos],
});
state.error<EvalError>(
"`addDrvOutputDependencies` can only act on derivations, not on a derivation output such as '%1%'",
c.output
).atPos(pos).debugThrow();
},
[&](const NixStringContextElem::DrvDeep & c) -> NixStringContextElem::DrvDeep {
/* Reuse original item because we want this to be idempotent. */
@ -261,10 +261,10 @@ static void prim_appendContext(EvalState & state, const PosIdx pos, Value * * ar
for (auto & i : *args[1]->attrs) {
const auto & name = state.symbols[i.name];
if (!state.store->isStorePath(name))
throw EvalError({
.msg = hintfmt("context key '%s' is not a store path", name),
.errPos = state.positions[i.pos]
});
state.error<EvalError>(
"context key '%s' is not a store path",
name
).atPos(i.pos).debugThrow();
auto namePath = state.store->parseStorePath(name);
if (!settings.readOnlyMode)
state.store->ensurePath(namePath);
@ -281,10 +281,10 @@ static void prim_appendContext(EvalState & state, const PosIdx pos, Value * * ar
if (iter != i.value->attrs->end()) {
if (state.forceBool(*iter->value, iter->pos, "while evaluating the `allOutputs` attribute of a string context")) {
if (!isDerivation(name)) {
throw EvalError({
.msg = hintfmt("tried to add all-outputs context of %s, which is not a derivation, to a string", name),
.errPos = state.positions[i.pos]
});
state.error<EvalError>(
"tried to add all-outputs context of %s, which is not a derivation, to a string",
name
).atPos(i.pos).debugThrow();
}
context.emplace(NixStringContextElem::DrvDeep {
.drvPath = namePath,
@ -296,10 +296,10 @@ static void prim_appendContext(EvalState & state, const PosIdx pos, Value * * ar
if (iter != i.value->attrs->end()) {
state.forceList(*iter->value, iter->pos, "while evaluating the `outputs` attribute of a string context");
if (iter->value->listSize() && !isDerivation(name)) {
throw EvalError({
.msg = hintfmt("tried to add derivation output context of %s, which is not a derivation, to a string", name),
.errPos = state.positions[i.pos]
});
state.error<EvalError>(
"tried to add derivation output context of %s, which is not a derivation, to a string",
name
).atPos(i.pos).debugThrow();
}
for (auto elem : iter->value->listItems()) {
auto outputName = state.forceStringNoCtx(*elem, iter->pos, "while evaluating an output name within a string context");

22
src/libexpr/primops/fetchClosure.cc
View file

@ -26,7 +26,7 @@ static void runFetchClosureWithRewrite(EvalState & state, const PosIdx pos, Stor
state.store->printStorePath(fromPath),
state.store->printStorePath(rewrittenPath),
state.store->printStorePath(*toPathMaybe)),
.errPos = state.positions[pos]
.pos = state.positions[pos]
});
if (!toPathMaybe)
throw Error({
@ -35,7 +35,7 @@ static void runFetchClosureWithRewrite(EvalState & state, const PosIdx pos, Stor
"Use this value for the 'toPath' attribute passed to 'fetchClosure'",
state.store->printStorePath(fromPath),
state.store->printStorePath(rewrittenPath)),
.errPos = state.positions[pos]
.pos = state.positions[pos]
});
}
@ -53,7 +53,7 @@ static void runFetchClosureWithRewrite(EvalState & state, const PosIdx pos, Stor
"The 'toPath' value '%s' is input-addressed, so it can't possibly be the result of rewriting to a content-addressed path.\n\n"
"Set 'toPath' to an empty string to make Nix report the correct content-addressed path.",
state.store->printStorePath(toPath)),
.errPos = state.positions[pos]
.pos = state.positions[pos]
});
}
@ -79,7 +79,7 @@ static void runFetchClosureWithContentAddressedPath(EvalState & state, const Pos
"to the 'fetchClosure' arguments.\n\n"
"Note that to ensure authenticity input-addressed store paths, users must configure a trusted binary cache public key on their systems. This is not needed for content-addressed paths.",
state.store->printStorePath(fromPath)),
.errPos = state.positions[pos]
.pos = state.positions[pos]
});
}
@ -102,7 +102,7 @@ static void runFetchClosureWithInputAddressedPath(EvalState & state, const PosId
"The store object referred to by 'fromPath' at '%s' is not input-addressed, but 'inputAddressed' is set to 'true'.\n\n"
"Remove the 'inputAddressed' attribute (it defaults to 'false') to expect 'fromPath' to be content-addressed",
state.store->printStorePath(fromPath)),
.errPos = state.positions[pos]
.pos = state.positions[pos]
});
}
@ -153,14 +153,14 @@ static void prim_fetchClosure(EvalState & state, const PosIdx pos, Value * * arg
else
throw Error({
.msg = hintfmt("attribute '%s' isn't supported in call to 'fetchClosure'", attrName),
.errPos = state.positions[pos]
.pos = state.positions[pos]
});
}
if (!fromPath)
throw Error({
.msg = hintfmt("attribute '%s' is missing in call to 'fetchClosure'", "fromPath"),
.errPos = state.positions[pos]
.pos = state.positions[pos]
});
bool inputAddressed = inputAddressedMaybe.value_or(false);
@ -171,14 +171,14 @@ static void prim_fetchClosure(EvalState & state, const PosIdx pos, Value * * arg
.msg = hintfmt("attribute '%s' is set to true, but '%s' is also set. Please remove one of them",
"inputAddressed",
"toPath"),
.errPos = state.positions[pos]
.pos = state.positions[pos]
});
}
if (!fromStoreUrl)
throw Error({
.msg = hintfmt("attribute '%s' is missing in call to 'fetchClosure'", "fromStore"),
.errPos = state.positions[pos]
.pos = state.positions[pos]
});
auto parsedURL = parseURL(*fromStoreUrl);
@ -188,13 +188,13 @@ static void prim_fetchClosure(EvalState & state, const PosIdx pos, Value * * arg
!(getEnv("_NIX_IN_TEST").has_value() && parsedURL.scheme == "file"))
throw Error({
.msg = hintfmt("'fetchClosure' only supports http:// and https:// stores"),
.errPos = state.positions[pos]
.pos = state.positions[pos]
});
if (!parsedURL.query.empty())
throw Error({
.msg = hintfmt("'fetchClosure' does not support URL query parameters (in '%s')", *fromStoreUrl),
.errPos = state.positions[pos]
.pos = state.positions[pos]
});
auto fromStore = openStore(parsedURL.to_string());

10
src/libexpr/primops/fetchMercurial.cc
View file

@ -38,17 +38,11 @@ static void prim_fetchMercurial(EvalState & state, const PosIdx pos, Value * * a
else if (n == "name")
name = state.forceStringNoCtx(*attr.value, attr.pos, "while evaluating the `name` attribute passed to builtins.fetchMercurial");
else
throw EvalError({
.msg = hintfmt("unsupported argument '%s' to 'fetchMercurial'", state.symbols[attr.name]),
.errPos = state.positions[attr.pos]
});
state.error<EvalError>("unsupported argument '%s' to 'fetchMercurial'", state.symbols[attr.name]).atPos(attr.pos).debugThrow();
}
if (url.empty())
throw EvalError({
.msg = hintfmt("'url' argument required"),
.errPos = state.positions[pos]
});
state.error<EvalError>("'url' argument required").atPos(pos).debugThrow();
} else
url = state.coerceToString(pos, *args[0], context,

56
src/libexpr/primops/fetchTree.cc
View file

@ -123,16 +123,14 @@ static void fetchTree(
if (auto aType = args[0]->attrs->get(state.sType)) {
if (type)
state.debugThrowLastTrace(EvalError({
.msg = hintfmt("unexpected attribute 'type'"),
.errPos = state.positions[pos]
}));
state.error<EvalError>(
"unexpected attribute 'type'"
).atPos(pos).debugThrow();
type = state.forceStringNoCtx(*aType->value, aType->pos, "while evaluating the `type` attribute passed to builtins.fetchTree");
} else if (!type)
state.debugThrowLastTrace(EvalError({
.msg = hintfmt("attribute 'type' is missing in call to 'fetchTree'"),
.errPos = state.positions[pos]
}));
state.error<EvalError>(
"attribute 'type' is missing in call to 'fetchTree'"
).atPos(pos).debugThrow();
attrs.emplace("type", type.value());
@ -153,16 +151,15 @@ static void fetchTree(
else if (attr.value->type() == nInt)
attrs.emplace(state.symbols[attr.name], uint64_t(attr.value->integer));
else
state.debugThrowLastTrace(TypeError("fetchTree argument '%s' is %s while a string, Boolean or integer is expected",
state.symbols[attr.name], showType(*attr.value)));
state.error<TypeError>("fetchTree argument '%s' is %s while a string, Boolean or integer is expected",
state.symbols[attr.name], showType(*attr.value)).debugThrow();
}
if (!params.allowNameArgument)
if (auto nameIter = attrs.find("name"); nameIter != attrs.end())
state.debugThrowLastTrace(EvalError({
.msg = hintfmt("attribute 'name' isn’t supported in call to 'fetchTree'"),
.errPos = state.positions[pos]
}));
state.error<EvalError>(
"attribute 'name' isn’t supported in call to 'fetchTree'"
).atPos(pos).debugThrow();
input = fetchers::Input::fromAttrs(std::move(attrs));
} else {
@ -183,8 +180,9 @@ static void fetchTree(
if (!evalSettings.pureEval && !input.isDirect())
input = lookupInRegistries(state.store, input).first;
if (evalSettings.pureEval && !input.isLocked())
state.debugThrowLastTrace(EvalError("in pure evaluation mode, 'fetchTree' requires a locked input, at %s", state.positions[pos]));
if (evalSettings.pureEval && !input.isLocked()) {
state.error<EvalError>("in pure evaluation mode, 'fetchTree' requires a locked input").atPos(pos).debugThrow();
}
auto [tree, input2] = input.fetch(state.store);
@ -225,17 +223,13 @@ static void fetch(EvalState & state, const PosIdx pos, Value * * args, Value & v
else if (n == "name")
name = state.forceStringNoCtx(*attr.value, attr.pos, "while evaluating the name of the content we should fetch");
else
state.debugThrowLastTrace(EvalError({
.msg = hintfmt("unsupported argument '%s' to '%s'", n, who),
.errPos = state.positions[attr.pos]
}));
state.error<EvalError>("unsupported argument '%s' to '%s'", n, who)
.atPos(pos).debugThrow();
}
if (!url)
state.debugThrowLastTrace(EvalError({
.msg = hintfmt("'url' argument required"),
.errPos = state.positions[pos]
}));
state.error<EvalError>(
"'url' argument required").atPos(pos).debugThrow();
} else
url = state.forceStringNoCtx(*args[0], pos, "while evaluating the url we should fetch");
@ -248,7 +242,7 @@ static void fetch(EvalState & state, const PosIdx pos, Value * * args, Value & v
name = baseNameOf(*url);
if (evalSettings.pureEval && !expectedHash)
state.debugThrowLastTrace(EvalError("in pure evaluation mode, '%s' requires a 'sha256' argument", who));
state.error<EvalError>("in pure evaluation mode, '%s' requires a 'sha256' argument", who).atPos(pos).debugThrow();
// early exit if pinned and already in the store
if (expectedHash && expectedHash->type == htSHA256) {
@ -277,9 +271,15 @@ static void fetch(EvalState & state, const PosIdx pos, Value * * args, Value & v
auto hash = unpack
? state.store->queryPathInfo(storePath)->narHash
: hashFile(htSHA256, state.store->toRealPath(storePath));
if (hash != *expectedHash)
state.debugThrowLastTrace(EvalError((unsigned int) 102, "hash mismatch in file downloaded from '%s':\n specified: %s\n got: %s",
*url, expectedHash->to_string(Base32, true), hash.to_string(Base32, true)));
if (hash != *expectedHash) {
state.error<EvalError>(
"hash mismatch in file downloaded from '%s':\n specified: %s\n got: %s",
*url,
expectedHash->to_string(Base32, true),
hash.to_string(Base32, true)
).withExitStatus(102)
.debugThrow();
}
}
state.allowAndSetStorePathString(storePath, v);

5
src/libexpr/primops/fromTOML.cc
View file

@ -83,10 +83,7 @@ static void prim_fromTOML(EvalState & state, const PosIdx pos, Value * * args, V
try {
visit(val, toml::parse(tomlStream, "fromTOML" /* the "filename" */));
} catch (std::exception & e) { // TODO: toml::syntax_error
throw EvalError({
.msg = hintfmt("while parsing a TOML string: %s", e.what()),
.errPos = state.positions[pos]
});
state.error<EvalError>("while parsing TOML: %s", e.what()).atPos(pos).debugThrow();
}
}

18
src/libexpr/value-to-json.cc
View file

@ -80,7 +80,7 @@ json printValueAsJSON(EvalState & state, bool strict,
try {
out.push_back(printValueAsJSON(state, strict, *elem, pos, context, copyToStore));
} catch (Error & e) {
e.addTrace({},
e.addTrace(state.positions[pos],
hintfmt("while evaluating list element at index %1%", i));
throw;
}
@ -99,13 +99,12 @@ json printValueAsJSON(EvalState & state, bool strict,
case nThunk:
case nFunction:
auto e = TypeError({
.msg = hintfmt("cannot convert %1% to JSON", showType(v)),
.errPos = state.positions[v.determinePos(pos)]
});
e.addTrace(state.positions[pos], hintfmt("message for the trace"));
state.debugThrowLastTrace(e);
throw e;
state.error<TypeError>(
"cannot convert %1% to JSON",
showType(v)
)
.atPos(v.determinePos(pos))
.debugThrow();
}
return out;
}
@ -119,7 +118,8 @@ void printValueAsJSON(EvalState & state, bool strict,
json ExternalValueBase::printValueAsJSON(EvalState & state, bool strict,
NixStringContext & context, bool copyToStore) const
{
state.debugThrowLastTrace(TypeError("cannot convert %1% to JSON", showType()));
state.error<TypeError>("cannot convert %1% to JSON", showType())
.debugThrow();
}

2
src/libexpr/value.hh
View file

@ -105,7 +105,7 @@ class ExternalValueBase
* Coerce the value to a string. Defaults to uncoercable, i.e. throws an
* error.
*/
virtual std::string coerceToString(const Pos & pos, NixStringContext & context, bool copyMore, bool copyToStore) const;
virtual std::string coerceToString(EvalState & state, const PosIdx & pos, NixStringContext & context, bool copyMore, bool copyToStore) const;
/**
* Compare to another value of the same type. Defaults to uncomparable,

2
src/libmain/shared.cc
View file

@ -339,7 +339,7 @@ int handleExceptions(const std::string & programName, std::function<void()> fun)
return 1;
} catch (BaseError & e) {
logError(e.info());
return e.status;
return e.info().status;
} catch (std::bad_alloc & e) {
printError(error + "out of memory");
return 1;

4
src/libstore/build/entry-points.cc
View file

@ -33,7 +33,7 @@ void Store::buildPaths(const std::vector<DerivedPath> & reqs, BuildMode buildMod
}
if (failed.size() == 1 && ex) {
ex->status = worker.failingExitStatus();
ex->withExitStatus(worker.failingExitStatus());
throw std::move(*ex);
} else if (!failed.empty()) {
if (ex) logError(ex->info());
@ -104,7 +104,7 @@ void Store::ensurePath(const StorePath & path)
if (goal->exitCode != Goal::ecSuccess) {
if (goal->ex) {
goal->ex->status = worker.failingExitStatus();
goal->ex->withExitStatus(worker.failingExitStatus());
throw std::move(*goal->ex);
} else
throw Error(worker.failingExitStatus(), "path '%s' does not exist and cannot be created", printStorePath(path));

2
src/libstore/daemon.cc
View file

@ -119,7 +119,7 @@ struct TunnelLogger : public Logger
if (GET_PROTOCOL_MINOR(clientVersion) >= 26) {
to << STDERR_ERROR << *ex;
} else {
to << STDERR_ERROR << ex->what() << ex->status;
to << STDERR_ERROR << ex->what() << ex->info().status;
}
}
}

6
src/libutil/error.cc
View file

@ -334,7 +334,7 @@ std::ostream & showErrorInfo(std::ostream & out, const ErrorInfo & einfo, bool s
* try {
* e->eval(*this, env, v);
* if (v.type() != nAttrs)
* throwTypeError("expected a set but found %1%", v);
* error<TypeError>("expected a set but found %1%", v);
* } catch (Error & e) {
* e.addTrace(pos, errorCtx);
* throw;
@ -348,7 +348,7 @@ std::ostream & showErrorInfo(std::ostream & out, const ErrorInfo & einfo, bool s
* e->eval(*this, env, v);
* try {
* if (v.type() != nAttrs)
* throwTypeError("expected a set but found %1%", v);
* error<TypeError>("expected a set but found %1%", v);
* } catch (Error & e) {
* e.addTrace(pos, errorCtx);
* throw;
@ -410,7 +410,7 @@ std::ostream & showErrorInfo(std::ostream & out, const ErrorInfo & einfo, bool s
oss << einfo.msg << "\n";
printPosMaybe(oss, "", einfo.errPos);
printPosMaybe(oss, "", einfo.pos);
auto suggestions = einfo.suggestions.trim();
if (!suggestions.suggestions.empty()) {

27
src/libutil/error.hh
View file

@ -84,9 +84,14 @@ inline bool operator>=(const Trace& lhs, const Trace& rhs);
struct ErrorInfo {
Verbosity level;
hintformat msg;
std::shared_ptr<Pos> errPos;
std::shared_ptr<Pos> pos;
std::list<Trace> traces;
/**
* Exit status.
*/
unsigned int status = 1;
Suggestions suggestions;
static std::optional<std::string> programName;
@ -103,18 +108,21 @@ class BaseError : public std::exception
protected:
mutable ErrorInfo err;
/**
* Cached formatted contents of `err.msg`.
*/
mutable std::optional<std::string> what_;
/**
* Format `err.msg` and set `what_` to the resulting value.
*/
const std::string & calcWhat() const;
public:
unsigned int status = 1; // exit status
BaseError(const BaseError &) = default;
template<typename... Args>
BaseError(unsigned int status, const Args & ... args)
: err { .level = lvlError, .msg = hintfmt(args...) }
, status(status)
: err { .level = lvlError, .msg = hintfmt(args...), .status = status }
{ }
template<typename... Args>
@ -149,6 +157,15 @@ public:
const std::string & msg() const { return calcWhat(); }
const ErrorInfo & info() const { calcWhat(); return err; }
void withExitStatus(unsigned int status)
{
err.status = status;
}
void atPos(std::shared_ptr<Pos> pos) {
err.pos = pos;
}
void pushTrace(Trace trace)
{
err.traces.push_front(trace);

2
src/libutil/logging.cc
View file

@ -196,7 +196,7 @@ struct JSONLogger : Logger {
json["level"] = ei.level;
json["msg"] = oss.str();
json["raw_msg"] = ei.msg.str();
to_json(json, ei.errPos);
to_json(json, ei.pos);
if (loggerSettings.showTrace.get() && !ei.traces.empty()) {
nlohmann::json traces = nlohmann::json::array();

4
src/nix-store/nix-store.cc
View file

@ -932,8 +932,8 @@ static void opServe(Strings opFlags, Strings opArgs)
store->buildPaths(toDerivedPaths(paths));
out << 0;
} catch (Error & e) {
assert(e.status);
out << e.status << e.msg();
assert(e.info().status);
out << e.info().status << e.msg();
}
break;
}

2
src/nix/eval.cc
View file

@ -104,7 +104,7 @@ struct CmdEval : MixJSON, InstallableValueCommand, MixReadOnlyOption
}
}
else
throw TypeError("value at '%s' is not a string or an attribute set", state->positions[pos]);
state->error<TypeError>("value at '%s' is not a string or an attribute set", state->positions[pos]).debugThrow();
};
recurse(*v, pos, *writeTo);

6
src/nix/flake.cc
View file

@ -808,10 +808,10 @@ struct CmdFlakeInitCommon : virtual Args, EvalCommand
auto templateDir = templateDirAttr->getString();
if (!store->isInStore(templateDir))
throw TypeError(
evalState->error<TypeError>(
"'%s' was not found in the Nix store\n"
"If you've set '%s' to a string, try using a path instead.",
templateDir, templateDirAttr->getAttrPathStr());
templateDir, templateDirAttr->getAttrPathStr()).debugThrow();
std::vector<Path> changedFiles;
std::vector<Path> conflictedFiles;
@ -1281,7 +1281,7 @@ struct CmdFlakeShow : FlakeCommand, MixJSON
{
auto aType = visitor.maybeGetAttr("type");
if (!aType || aType->getString() != "app")
throw EvalError("not an app definition");
state->error<EvalError>("not an app definition").debugThrow();
if (json) {
j.emplace("type", "app");
} else {

5
tests/functional/lang/eval-fail-attr-name-type.err.exp
View file

@ -14,3 +14,8 @@ error:
8|
error: expected a string but found an integer: 1
at /pwd/lang/eval-fail-attr-name-type.nix:7:17:
6| in
7| attrs.puppy.${key}
| ^
8|

2
tests/functional/lang/eval-fail-fromTOML-timestamps.err.exp
View file

@ -5,4 +5,4 @@ error:
| ^
2| key = "value"
error: while parsing a TOML string: Dates and times are not supported
error: while parsing TOML: Dates and times are not supported

5
tests/functional/lang/eval-fail-toJSON.err.exp
View file

@ -20,6 +20,11 @@ error:
3| true
… while evaluating list element at index 3
at /pwd/lang/eval-fail-toJSON.nix:2:3:
1| builtins.toJSON {
2| a.b = [
| ^
3| true
… while evaluating attribute 'c'
at /pwd/lang/eval-fail-toJSON.nix:7:7:

5
tests/functional/lang/eval-fail-using-set-as-attr-name.err.exp
View file

@ -7,3 +7,8 @@ error:
6|
error: expected a string but found a set: { }
at /pwd/lang/eval-fail-using-set-as-attr-name.nix:5:10:
4| in
5| attr.${key}
| ^
6|

20
tests/unit/libexpr/error_traces.cc
View file

@ -12,33 +12,33 @@ namespace nix {
TEST_F(ErrorTraceTest, TraceBuilder) {
ASSERT_THROW(
state.error("Not much").debugThrow<EvalError>(),
state.error<EvalError>("puppy").debugThrow(),
EvalError
);
ASSERT_THROW(
state.error("Not much").withTrace(noPos, "No more").debugThrow<EvalError>(),
state.error<EvalError>("puppy").withTrace(noPos, "doggy").debugThrow(),
EvalError
);
ASSERT_THROW(
try {
try {
state.error("Not much").withTrace(noPos, "No more").debugThrow<EvalError>();
state.error<EvalError>("puppy").withTrace(noPos, "doggy").debugThrow();
} catch (Error & e) {
e.addTrace(state.positions[noPos], "Something", "");
e.addTrace(state.positions[noPos], "beans", "");
throw;
}
} catch (BaseError & e) {
ASSERT_EQ(PrintToString(e.info().msg),
PrintToString(hintfmt("Not much")));
PrintToString(hintfmt("puppy")));
auto trace = e.info().traces.rbegin();
ASSERT_EQ(e.info().traces.size(), 2);
ASSERT_EQ(PrintToString(trace->hint),
PrintToString(hintfmt("No more")));
PrintToString(hintfmt("doggy")));
trace++;
ASSERT_EQ(PrintToString(trace->hint),
PrintToString(hintfmt("Something")));
PrintToString(hintfmt("beans")));
throw;
}
, EvalError
@ -47,12 +47,12 @@ namespace nix {
TEST_F(ErrorTraceTest, NestedThrows) {
try {
state.error("Not much").withTrace(noPos, "No more").debugThrow<EvalError>();
state.error<EvalError>("puppy").withTrace(noPos, "doggy").debugThrow();
} catch (BaseError & e) {
try {
state.error("Not much more").debugThrow<EvalError>();
state.error<EvalError>("beans").debugThrow();
} catch (Error & e2) {
e.addTrace(state.positions[noPos], "Something", "");
e.addTrace(state.positions[noPos], "beans2", "");
//e2.addTrace(state.positions[noPos], "Something", "");
ASSERT_TRUE(e.info().traces.size() == 2);
ASSERT_TRUE(e2.info().traces.size() == 0);