aboutsummaryrefslogtreecommitdiff
path: root/src/libexpr/eval.cc
diff options
context:
space:
mode:
Diffstat (limited to 'src/libexpr/eval.cc')
-rw-r--r--src/libexpr/eval.cc202
1 files changed, 99 insertions, 103 deletions
diff --git a/src/libexpr/eval.cc b/src/libexpr/eval.cc
index 0a9ac68be..bd102b186 100644
--- a/src/libexpr/eval.cc
+++ b/src/libexpr/eval.cc
@@ -418,6 +418,59 @@ static Strings parseNixPath(const std::string & s)
return res;
}
+template<class ErrorType>
+ErrorBuilder<ErrorType>::ErrorBuilder(EvalState & s):
+ state(s),
+ info(ErrorInfo { .msg = hintformat(""), .errPos = std::nullopt, })
+{}
+
+template<class ErrorType>
+ErrorBuilder<ErrorType> & ErrorBuilder<ErrorType>::atPos(PosIdx pos)
+{
+ info.errPos = state.positions[pos];
+ return *this;
+}
+
+template<class ErrorType>
+ErrorBuilder<ErrorType> & ErrorBuilder<ErrorType>::withTrace(PosIdx pos, const std::string_view text)
+{
+ info.traces.push_back(Trace{ .pos = state.positions[pos], .hint = hintformat(std::string(text)), .frame = false });
+ return *this;
+}
+
+template<class ErrorType>
+ErrorBuilder<ErrorType> & ErrorBuilder<ErrorType>::withFrameTrace(PosIdx pos, const std::string_view text)
+{
+ info.traces.push_back(Trace{ .pos = state.positions[pos], .hint = hintformat(std::string(text)), .frame = true });
+ return *this;
+}
+
+template<class ErrorType>
+ErrorBuilder<ErrorType> & ErrorBuilder<ErrorType>::suggestions(Suggestions & s) {
+ info.suggestions = s;
+ return *this;
+}
+
+template<class ErrorType>
+ErrorBuilder<ErrorType> & ErrorBuilder<ErrorType>::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 = std::nullopt,
+ .expr = expr,
+ .env = env,
+ .hint = hintformat("Fake frame for debugg{ing,er} purposes"),
+ .isError = true
+ });
+ return *this;
+}
+
+template<class ErrorType>
+void ErrorBuilder<ErrorType>::debugThrow() {
+ // NOTE: We always use the -LastTrace version as we push the new trace in withFrame()
+ state.debugThrowLastTrace(ErrorType(info));
+}
+
EvalState::EvalState(
const Strings & _searchPath,
@@ -831,71 +884,6 @@ void EvalState::runDebugRepl(const Error * error, const Env & env, const Expr &
}
}
-/* Every "format" object (even temporary) takes up a few hundred bytes
- of stack space, which is a real killer in the recursive
- evaluator. So here are some helper functions for throwing
- exceptions. */
-
-template <typename ErrorType>
-void EvalState::throwErrorWithTrace(
- PosIdx pos, const char* format,
- const std::string_view s1, const std::string_view s2,
- const Symbol * sym1, const Symbol * sym2,
- Value * val1, Value * val2,
- PosIdx pos1,
- const std::string_view s3,
- const Suggestions * suggestions,
- PosIdx tracePos, const std::string_view traceStr,
- Env * env, Expr * expr)
-{
- hintformat f(format);
- if (!s1.empty()) { f = f % s1; }
- if (!s2.empty()) { f = f % s2; }
- if (sym1) { f = f % symbols[*sym1]; }
- if (sym2) { f = f % symbols[*sym2]; }
- if (val1) { f = f % showType(*val1); }
- if (val2) { f = f % showType(*val2); }
- if (pos1) { f = f % positions[pos1]; }
- if (!s3.empty()) { f = f % s3; }
-
- auto e = ErrorType(ErrorInfo {
- .msg = f,
- .errPos = positions[pos],
- .suggestions = suggestions ? *suggestions : Suggestions(),
- });
- e.addTrace(positions[tracePos], traceStr);
- debugThrow(e, env, expr);
-}
-
-template <typename ErrorType>
-void EvalState::throwError(
- PosIdx pos, const char* format,
- const std::string_view s1, const std::string_view s2,
- const Symbol * sym1, const Symbol * sym2,
- Value * val1, Value * val2,
- PosIdx pos1,
- const std::string_view s3,
- const Suggestions * suggestions,
- Env * env, Expr * expr)
-{
- hintformat f(format);
- if (!s1.empty()) { f = f % s1; }
- if (!s2.empty()) { f = f % s2; }
- if (sym1) { f = f % symbols[*sym1]; }
- if (sym2) { f = f % symbols[*sym2]; }
- if (val1) { f = f % showType(*val1); }
- if (val2) { f = f % showType(*val2); }
- if (pos1) { f = f % positions[pos1]; }
- if (!s3.empty()) { f = f % s3; }
-
- auto e = ErrorType(ErrorInfo {
- .msg = f,
- .errPos = positions[pos],
- .suggestions = suggestions ? *suggestions : Suggestions(),
- });
- debugThrow(e, env, expr);
-}
-
void EvalState::addErrorTrace(Error & e, const char * s, const std::string & s2) const
{
e.addTrace(std::nullopt, s, s2);
@@ -990,7 +978,7 @@ inline Value * EvalState::lookupVar(Env * env, const ExprVar & var, bool noEval)
return j->value;
}
if (!env->prevWith)
- throwError<UndefinedVarError>(var.pos, "undefined variable '%1%'", "", "", &var.name, 0, 0, 0, noPos, "", 0, env, const_cast<ExprVar*>(&var));
+ error<UndefinedVarError>("undefined variable '%1%'", symbols[var.name]).atPos(var.pos).withFrame(*env, var).debugThrow();
for (size_t l = env->prevWith; l; --l, env = env->up) ;
}
}
@@ -1140,7 +1128,7 @@ void EvalState::cacheFile(
// computation.
if (mustBeTrivial &&
!(dynamic_cast<ExprAttrs *>(e)))
- throwError<EvalError>(noPos, "file '%s' must be an attribute set", path, "", 0, 0, 0, 0, noPos, "", 0, 0, 0);
+ 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);
@@ -1164,7 +1152,7 @@ inline bool EvalState::evalBool(Env & env, Expr * e, const PosIdx pos, std::stri
Value v;
e->eval(*this, env, v);
if (v.type() != nBool)
- throwError<TypeError>(noPos, "value is %1% while a Boolean was expected", "", "", 0, 0, &v, 0, noPos, "", 0, &env, e);
+ error<TypeError>("value is %1% while a Boolean was expected", showType(v)).withFrame(env, *e).debugThrow();
return v.boolean;
} catch (Error & e) {
e.addTrace(positions[pos], errorCtx);
@@ -1178,7 +1166,7 @@ inline void EvalState::evalAttrs(Env & env, Expr * e, Value & v, const PosIdx po
try {
e->eval(*this, env, v);
if (v.type() != nAttrs)
- throwError<TypeError>(noPos, "value is %1% while a set was expected", "", "", 0, 0, &v, 0, noPos, "", 0, &env, e);
+ error<TypeError>("value is %1% while a set was expected", showType(v)).withFrame(env, *e).debugThrow();
} catch (Error & e) {
e.addTrace(positions[pos], errorCtx);
throw;
@@ -1287,7 +1275,7 @@ 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.throwError<EvalError>(i.pos, "dynamic attribute '%1%' already defined at %2%", "", "", &nameSym, 0, 0, 0, j->pos, "", 0, &env, this);
+ 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 */
@@ -1390,9 +1378,8 @@ 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.throwError<EvalError>(pos, "attribute '%1%' missing",
- "", "", &name, 0, 0, 0, noPos, "", &suggestions,
- &env, this);
+ state.error<EvalError>("attribute '%1%' missing", state.symbols[name])
+ .atPos(pos).suggestions(suggestions).withFrame(env, *this).debugThrow();
}
}
vAttrs = j->value;
@@ -1502,10 +1489,13 @@ void EvalState::callFunction(Value & fun, size_t nrArgs, Value * * args, Value &
auto j = args[0]->attrs->get(i.name);
if (!j) {
if (!i.def) {
- throwErrorWithTrace<TypeError>(lambda.pos,
- "function '%1%' called without required argument '%2%'",
- (lambda.name ? std::string(symbols[lambda.name]) : "anonymous lambda"), "",
- &i.name, 0, 0, 0, noPos, "", 0, pos, "from call site", fun.lambda.env, &lambda);
+ 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();
}
env2.values[displ++] = i.def->maybeThunk(*this, env2);
} else {
@@ -1525,10 +1515,14 @@ 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]);
- throwErrorWithTrace<TypeError>(lambda.pos,
- "function '%1%' called with unexpected argument '%2%'",
- (lambda.name ? std::string(symbols[lambda.name]) : "anonymous lambda"), "",
- &i.name, 0, 0, 0, noPos, "", &suggestions, pos, "from call site", fun.lambda.env, &lambda);
+ 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")
+ .suggestions(suggestions)
+ .withFrame(*fun.lambda.env, lambda)
+ .debugThrow();
}
abort(); // can't happen
}
@@ -1553,8 +1547,10 @@ void EvalState::callFunction(Value & fun, size_t nrArgs, Value * * args, Value &
if (loggerSettings.showTrace.get()) {
addErrorTrace(e,
lambda.pos,
- "while evaluating the '%s' function",
- (lambda.name ? std::string(symbols[lambda.name]) : "anonymous lambda"),
+ "while evaluating %s",
+ lambda.name
+ ? concatStrings("'", symbols[lambda.name], "'")
+ : "anonymous lambda",
true);
if (pos) addErrorTrace(e, pos, "from call site%s", "", true);
}
@@ -1657,7 +1653,7 @@ void EvalState::callFunction(Value & fun, size_t nrArgs, Value * * args, Value &
}
else
- throwError<TypeError>(pos, "attempt to call something which is not a function but %1%", "", "", 0, 0, &vCur, 0, noPos, "", 0, 0, 0);
+ error<TypeError>("attempt to call something which is not a function but %1%", showType(vCur)).atPos(pos).debugThrow();
}
vRes = vCur;
@@ -1721,12 +1717,12 @@ void EvalState::autoCallFunction(Bindings & args, Value & fun, Value & res)
if (j != args.end()) {
attrs.insert(*j);
} else if (!i.def) {
- throwError<MissingArgumentError>(i.pos, 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/expressions/language-constructs.html#functions.)", "", "", &i.name, 0, 0, 0, noPos, "", 0,
- fun.lambda.env, fun.lambda.fun);
+https://nixos.org/manual/nix/stable/expressions/language-constructs.html#functions.)", symbols[i.name])
+ .atPos(i.pos).withFrame(*fun.lambda.env, *fun.lambda.fun).debugThrow();
}
}
}
@@ -1759,7 +1755,7 @@ 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.throwError<AssertionError>(pos, "assertion '%1%' failed", out.str(), "", 0, 0, 0, 0, noPos, "", 0, &env, this);
+ state.error<AssertionError>("assertion '%1%' failed", out.str()).atPos(pos).withFrame(env, *this).debugThrow();
}
body->eval(state, env, v);
}
@@ -1936,14 +1932,14 @@ void ExprConcatStrings::eval(EvalState & state, Env & env, Value & v)
nf = n;
nf += vTmp.fpoint;
} else
- state.throwError<EvalError>(i_pos, "cannot add %1% to an integer", "", "", 0, 0, &vTmp, 0, noPos, "", 0, &env, this);
+ 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.throwError<EvalError>(i_pos, "cannot add %1% to a float", "", "", 0, 0, &vTmp, 0, noPos, "", 0, &env, this);
+ 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
@@ -1963,7 +1959,7 @@ void ExprConcatStrings::eval(EvalState & state, Env & env, Value & v)
v.mkFloat(nf);
else if (firstType == nPath) {
if (!context.empty())
- state.throwError<EvalError>(pos, "a string that refers to a store path cannot be appended to a path", "", "", 0, 0, 0, 0, noPos, "", 0, &env, this);
+ 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(str()));
} else
v.mkStringMove(c_str(), context);
@@ -2018,7 +2014,7 @@ NixInt EvalState::forceInt(Value & v, const PosIdx pos, std::string_view errorCt
try {
forceValue(v, pos);
if (v.type() != nInt)
- throwError<TypeError>(noPos, "value is %1% while an integer was expected", "", "", 0, 0, &v, 0, noPos, "", 0, 0, 0);
+ error<TypeError>("value is %1% while an integer was expected", showType(v)).debugThrow();
return v.integer;
} catch (Error & e) {
e.addTrace(positions[pos], errorCtx);
@@ -2034,7 +2030,7 @@ NixFloat EvalState::forceFloat(Value & v, const PosIdx pos, std::string_view err
if (v.type() == nInt)
return v.integer;
else if (v.type() != nFloat)
- throwError<TypeError>(noPos, "value is %1% while a float was expected", "", "", 0, 0, &v, 0, noPos, "", 0, 0, 0);
+ error<TypeError>("value is %1% while a float was expected", showType(v)).debugThrow();
return v.fpoint;
} catch (Error & e) {
e.addTrace(positions[pos], errorCtx);
@@ -2048,7 +2044,7 @@ bool EvalState::forceBool(Value & v, const PosIdx pos, std::string_view errorCtx
try {
forceValue(v, pos);
if (v.type() != nBool)
- throwError<TypeError>(noPos, "value is %1% while a Boolean was expected", "", "", 0, 0, &v, 0, noPos, "", 0, 0, 0);
+ error<TypeError>("value is %1% while a Boolean was expected", showType(v)).debugThrow();
return v.boolean;
} catch (Error & e) {
e.addTrace(positions[pos], errorCtx);
@@ -2068,7 +2064,7 @@ void EvalState::forceFunction(Value & v, const PosIdx pos, std::string_view erro
try {
forceValue(v, pos);
if (v.type() != nFunction && !isFunctor(v))
- throwError<TypeError>(noPos, "value is %1% while a function was expected", "", "", 0, 0, &v, 0, noPos, "", 0, 0, 0);
+ error<TypeError>("value is %1% while a function was expected", showType(v)).debugThrow();
} catch (Error & e) {
e.addTrace(positions[pos], errorCtx);
throw;
@@ -2081,7 +2077,7 @@ std::string_view EvalState::forceString(Value & v, const PosIdx pos, std::string
try {
forceValue(v, pos);
if (v.type() != nString)
- throwError<TypeError>(noPos, "value is %1% while a string was expected", "", "", 0, 0, &v, 0, noPos, "", 0, 0, 0);
+ error<TypeError>("value is %1% while a string was expected", showType(v)).debugThrow();
return v.string.s;
} catch (Error & e) {
e.addTrace(positions[pos], errorCtx);
@@ -2142,7 +2138,7 @@ std::string_view EvalState::forceStringNoCtx(Value & v, const PosIdx pos, std::s
{
auto s = forceString(v, pos, errorCtx);
if (v.string.context) {
- throwErrorWithTrace<EvalError>(noPos, "the string '%1%' is not allowed to refer to a store path (such as '%2%')", v.string.s, v.string.context[0], 0, 0, 0, 0, noPos, "", 0, pos, errorCtx, 0, 0);
+ 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;
}
@@ -2198,7 +2194,7 @@ BackedStringView EvalState::coerceToString(const PosIdx pos, Value & v, PathSet
return std::move(*maybeString);
auto i = v.attrs->find(sOutPath);
if (i == v.attrs->end())
- throwErrorWithTrace<TypeError>(noPos, "cannot coerce a set to a string", "", "", 0, 0, &v, 0, noPos, "", 0, pos, errorCtx, 0, 0);
+ error<TypeError>("cannot coerce a set to a string", showType(v)).withTrace(pos, errorCtx).debugThrow();
return coerceToString(pos, *i->value, context, coerceMore, copyToStore, canonicalizePath, errorCtx);
}
@@ -2233,14 +2229,14 @@ BackedStringView EvalState::coerceToString(const PosIdx pos, Value & v, PathSet
}
}
- throwErrorWithTrace<TypeError>(noPos, "cannot coerce %1% to a string", "", "", 0, 0, &v, 0, noPos, "", 0, pos, errorCtx, 0, 0);
+ error<TypeError>("cannot coerce %1% to a string", showType(v)).withTrace(pos, errorCtx).debugThrow();
}
std::string EvalState::copyPathToStore(PathSet & context, const Path & path)
{
if (nix::isDerivation(path))
- throwError<EvalError>(noPos, "file names are not allowed to end in '%1%'", drvExtension, "", 0, 0, 0, 0, noPos, "", 0, 0, 0);
+ error<EvalError>("file names are not allowed to end in '%1%'", drvExtension).debugThrow();
Path dstPath;
auto i = srcToStore.find(path);
@@ -2265,7 +2261,7 @@ Path EvalState::coerceToPath(const PosIdx pos, Value & v, PathSet & context, std
{
auto path = coerceToString(pos, v, context, false, false, true, errorCtx).toOwned();
if (path == "" || path[0] != '/')
- throwErrorWithTrace<EvalError>(noPos, "string '%1%' doesn't represent an absolute path", path, "", 0, 0, 0, 0, noPos, "", 0, pos, errorCtx, 0, 0);
+ error<EvalError>("string '%1%' doesn't represent an absolute path", path).withTrace(pos, errorCtx).debugThrow();
return path;
}
@@ -2275,7 +2271,7 @@ StorePath EvalState::coerceToStorePath(const PosIdx pos, Value & v, PathSet & co
auto path = coerceToString(pos, v, context, false, false, true, errorCtx).toOwned();
if (auto storePath = store->maybeParseStorePath(path))
return *storePath;
- throwErrorWithTrace<EvalError>(noPos, "path '%1%' is not in the Nix store", path, "", 0, 0, 0, 0, noPos, "", 0, pos, errorCtx, 0, 0);
+ error<EvalError>("path '%1%' is not in the Nix store", path).withTrace(pos, errorCtx).debugThrow();
}
@@ -2352,7 +2348,7 @@ bool EvalState::eqValues(Value & v1, Value & v2, const PosIdx pos, std::string_v
return v1.fpoint == v2.fpoint;
default:
- throwErrorWithTrace<EvalError>(noPos, "cannot compare %1% with %2%", "", "", 0, 0, &v1, &v2, noPos, "", 0, pos, errorCtx, 0, 0);
+ error<EvalError>("cannot compare %1% with %2%", showType(v1), showType(v2)).withTrace(pos, errorCtx).debugThrow();
}
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-23 02:15:39 +0000