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https://github.com/privatevoid-net/nix-super.git
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117 lines
3.2 KiB
C++
117 lines
3.2 KiB
C++
#pragma once
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#include <algorithm>
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#include "error.hh"
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#include "pos-idx.hh"
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namespace nix {
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struct Env;
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struct Expr;
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struct Value;
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class EvalState;
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template<class T>
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class EvalErrorBuilder;
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/**
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* Base class for all errors that occur during evaluation.
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*
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* Most subclasses should inherit from `EvalError` instead of this class.
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*/
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class EvalBaseError : public Error
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{
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template<class T>
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friend class EvalErrorBuilder;
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public:
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EvalState & state;
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EvalBaseError(EvalState & state, ErrorInfo && errorInfo)
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: Error(errorInfo)
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, state(state)
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{
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}
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template<typename... Args>
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explicit EvalBaseError(EvalState & state, const std::string & formatString, const Args &... formatArgs)
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: Error(formatString, formatArgs...)
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, state(state)
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{
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}
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};
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/**
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* `EvalError` is the base class for almost all errors that occur during evaluation.
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*
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* All instances of `EvalError` should show a degree of purity that allows them to be
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* cached in pure mode. This means that they should not depend on the configuration or the overall environment.
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*/
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MakeError(EvalError, EvalBaseError);
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MakeError(ParseError, Error);
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MakeError(AssertionError, EvalError);
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MakeError(ThrownError, AssertionError);
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MakeError(Abort, EvalError);
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MakeError(TypeError, EvalError);
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MakeError(UndefinedVarError, EvalError);
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MakeError(MissingArgumentError, EvalError);
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MakeError(InfiniteRecursionError, EvalError);
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struct InvalidPathError : public EvalError
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{
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public:
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Path path;
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InvalidPathError(EvalState & state, const Path & path)
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: EvalError(state, "path '%s' is not valid", path)
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{
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}
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};
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/**
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* `EvalErrorBuilder`s may only be constructed by `EvalState`. The `debugThrow`
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* method must be the final method in any such `EvalErrorBuilder` usage, and it
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* handles deleting the object.
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*/
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template<class T>
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class EvalErrorBuilder final
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{
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friend class EvalState;
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template<typename... Args>
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explicit EvalErrorBuilder(EvalState & state, const Args &... args)
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: error(T(state, args...))
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{
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}
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public:
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T error;
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[[nodiscard, gnu::noinline]] EvalErrorBuilder<T> & withExitStatus(unsigned int exitStatus);
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[[nodiscard, gnu::noinline]] EvalErrorBuilder<T> & atPos(PosIdx pos);
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[[nodiscard, gnu::noinline]] EvalErrorBuilder<T> & atPos(Value & value, PosIdx fallback = noPos);
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[[nodiscard, gnu::noinline]] EvalErrorBuilder<T> & withTrace(PosIdx pos, const std::string_view text);
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[[nodiscard, gnu::noinline]] EvalErrorBuilder<T> & withFrameTrace(PosIdx pos, const std::string_view text);
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[[nodiscard, gnu::noinline]] EvalErrorBuilder<T> & withSuggestions(Suggestions & s);
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[[nodiscard, gnu::noinline]] EvalErrorBuilder<T> & withFrame(const Env & e, const Expr & ex);
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[[nodiscard, gnu::noinline]] EvalErrorBuilder<T> & addTrace(PosIdx pos, HintFmt hint);
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[[nodiscard, gnu::noinline]] EvalErrorBuilder<T> & setIsFromExpr();
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template<typename... Args>
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[[nodiscard, gnu::noinline]] EvalErrorBuilder<T> &
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addTrace(PosIdx pos, std::string_view formatString, const Args &... formatArgs);
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/**
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* Delete the `EvalErrorBuilder` and throw the underlying exception.
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*/
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[[gnu::noinline, gnu::noreturn]] void debugThrow();
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};
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}
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