eldritch horrors
61eed2c97c
this finally gives us a witness type we can use to prove that a certain call graph subtree can't be used in kj promises using only a single new assumption: if EvalState& is never held as a reference member of a type and instead only ever passes as an argument or held on the stack we can be certain that anything that has access to en EvalState ref must never be run inside a promise and, crucially, that anything that doesn't have access to an EvalState& *can* be run inside a promise without problems. Change-Id: I6c15ada479175ad7e6cd3e4a729a5586b3ba30d6
60 lines
1.7 KiB
C++
60 lines
1.7 KiB
C++
#include "lix/libexpr/attr-set.hh"
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#include "lix/libutil/error.hh"
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#include "lix/libexpr/eval-settings.hh"
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#include "lix/libexpr/eval.hh"
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#include "lix/libutil/finally.hh"
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#include "lix/libexpr/nixexpr.hh"
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#include "lix/libexpr/symbol-table.hh"
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#include "lix/libutil/users.hh"
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#include "lix/libexpr/parser/change_head.hh"
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#include "lix/libexpr/parser/grammar.hh"
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#include "lix/libexpr/parser/state.hh"
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#include <charconv>
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#include <memory>
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// Linter complains that this is a "suspicious include of file with '.cc' extension".
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// While that is correct and generally not great, it is one of the less bad options to pick
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// in terms of diff noise.
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// NOLINTNEXTLINE(bugprone-suspicious-include)
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#include "lix/libexpr/parser/parser-impl1.inc.cc"
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namespace nix {
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Expr * Evaluator::parse(
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char * text,
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size_t length,
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Pos::Origin origin,
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const SourcePath & basePath,
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std::shared_ptr<StaticEnv> & staticEnv,
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const FeatureSettings & featureSettings)
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{
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parser::State s = {
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symbols,
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positions,
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basePath,
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positions.addOrigin(origin, length),
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this->s.exprSymbols,
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featureSettings,
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};
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p::string_input<p::tracking_mode::lazy> inp{std::string_view{text, length}, "input"};
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try {
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parser::v1::ExprState x;
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p::parse<parser::grammar::v1::root, parser::v1::BuildAST, parser::v1::Control>(inp, x, s);
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auto [_pos, result] = x.finish(s);
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result->bindVars(*this, staticEnv);
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return result.release();
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} catch (p::parse_error & e) {
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auto pos = e.positions().back();
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throw ParseError({
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.msg = HintFmt("syntax error, %s", e.message()),
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.pos = positions[s.positions.add(s.origin, pos.byte)]
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});
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}
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}
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}
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