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* New `vector` library! See https://rfcs.luau.org/vector-library.html for details * Replace the use of non-portable `strnlen` with `memchr`. `strnlen` is not part of any C or C++ standard. * Introduce `lua_newuserdatataggedwithmetatable` for faster tagged userdata creation of userdata with metatables registered with `lua_setuserdatametatable` Old Solver * It used to be the case that a module's result type would unconditionally be inferred to be `any` if it imported any module that participates in any import cycle. This is now fixed. New Solver * Improve inference of `table.freeze`: We now infer read-only properties on tables after they have been frozen. * We now correctly flag cases where `string.format` is called with 0 arguments. * Fix a bug in user-defined type functions where table properties could be lost if the table had a metatable * Reset the random number seed for each evaluation of a type function * We now retry subtyping arguments if it failed due to hidden variadics. --------- Co-authored-by: Aaron Weiss <aaronweiss@roblox.com> Co-authored-by: Alexander McCord <amccord@roblox.com> Co-authored-by: Vighnesh <vvijay@roblox.com> Co-authored-by: Aviral Goel <agoel@roblox.com> Co-authored-by: David Cope <dcope@roblox.com> Co-authored-by: Lily Brown <lbrown@roblox.com> Co-authored-by: Vyacheslav Egorov <vegorov@roblox.com> Co-authored-by: Junseo Yoo <jyoo@roblox.com>
529 lines
16 KiB
C++
529 lines
16 KiB
C++
// This file is part of the Luau programming language and is licensed under MIT License; see LICENSE.txt for details
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#include "Luau/Common.h"
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#include "Luau/Scope.h"
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#include "Luau/Symbol.h"
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#include "Luau/TypeInfer.h"
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#include "Luau/Type.h"
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#include "Fixture.h"
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#include "doctest.h"
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using namespace Luau;
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LUAU_FASTFLAG(LuauSolverV2);
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LUAU_FASTFLAG(LuauUnifierRecursionOnRestart);
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struct TryUnifyFixture : Fixture
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{
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// Cannot use `TryUnifyFixture` under DCR.
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DOES_NOT_PASS_NEW_SOLVER_GUARD();
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TypeArena arena;
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ScopePtr globalScope{new Scope{arena.addTypePack({TypeId{}})}};
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InternalErrorReporter iceHandler;
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UnifierSharedState unifierState{&iceHandler};
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Normalizer normalizer{&arena, builtinTypes, NotNull{&unifierState}};
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Unifier state{NotNull{&normalizer}, NotNull{globalScope.get()}, Location{}, Variance::Covariant};
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};
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TEST_SUITE_BEGIN("TryUnifyTests");
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TEST_CASE_FIXTURE(TryUnifyFixture, "primitives_unify")
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{
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Type numberOne{TypeVariant{PrimitiveType{PrimitiveType::Number}}};
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Type numberTwo = numberOne.clone();
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state.tryUnify(&numberTwo, &numberOne);
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CHECK(!state.failure);
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CHECK(state.errors.empty());
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}
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TEST_CASE_FIXTURE(TryUnifyFixture, "compatible_functions_are_unified")
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{
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Type functionOne{TypeVariant{FunctionType(arena.addTypePack({arena.freshType(globalScope->level)}), arena.addTypePack({builtinTypes->numberType}))
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}};
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Type functionTwo{
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TypeVariant{FunctionType(arena.addTypePack({arena.freshType(globalScope->level)}), arena.addTypePack({arena.freshType(globalScope->level)}))}
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};
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state.tryUnify(&functionTwo, &functionOne);
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CHECK(!state.failure);
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CHECK(state.errors.empty());
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state.log.commit();
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CHECK_EQ(functionOne, functionTwo);
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}
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TEST_CASE_FIXTURE(TryUnifyFixture, "incompatible_functions_are_preserved")
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{
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TypePackVar argPackOne{TypePack{{arena.freshType(globalScope->level)}, std::nullopt}};
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Type functionOne{TypeVariant{FunctionType(arena.addTypePack({arena.freshType(globalScope->level)}), arena.addTypePack({builtinTypes->numberType}))
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}};
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Type functionOneSaved = functionOne.clone();
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TypePackVar argPackTwo{TypePack{{arena.freshType(globalScope->level)}, std::nullopt}};
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Type functionTwo{TypeVariant{FunctionType(arena.addTypePack({arena.freshType(globalScope->level)}), arena.addTypePack({builtinTypes->stringType}))
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}};
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Type functionTwoSaved = functionTwo.clone();
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state.tryUnify(&functionTwo, &functionOne);
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CHECK(state.failure);
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CHECK(!state.errors.empty());
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CHECK_EQ(functionOne, functionOneSaved);
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CHECK_EQ(functionTwo, functionTwoSaved);
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}
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TEST_CASE_FIXTURE(TryUnifyFixture, "tables_can_be_unified")
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{
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Type tableOne{TypeVariant{
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TableType{{{"foo", {arena.freshType(globalScope->level)}}}, std::nullopt, globalScope->level, TableState::Unsealed},
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}};
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Type tableTwo{TypeVariant{
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TableType{{{"foo", {arena.freshType(globalScope->level)}}}, std::nullopt, globalScope->level, TableState::Unsealed},
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}};
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CHECK_NE(*getMutable<TableType>(&tableOne)->props["foo"].type(), *getMutable<TableType>(&tableTwo)->props["foo"].type());
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state.tryUnify(&tableTwo, &tableOne);
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CHECK(!state.failure);
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CHECK(state.errors.empty());
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state.log.commit();
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CHECK_EQ(*getMutable<TableType>(&tableOne)->props["foo"].type(), *getMutable<TableType>(&tableTwo)->props["foo"].type());
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}
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TEST_CASE_FIXTURE(TryUnifyFixture, "incompatible_tables_are_preserved")
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{
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Type tableOne{TypeVariant{
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TableType{
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{{"foo", {arena.freshType(globalScope->level)}}, {"bar", {builtinTypes->numberType}}},
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std::nullopt,
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globalScope->level,
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TableState::Unsealed
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},
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}};
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Type tableTwo{TypeVariant{
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TableType{
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{{"foo", {arena.freshType(globalScope->level)}}, {"bar", {builtinTypes->stringType}}},
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std::nullopt,
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globalScope->level,
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TableState::Unsealed
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},
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}};
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CHECK_NE(*getMutable<TableType>(&tableOne)->props["foo"].type(), *getMutable<TableType>(&tableTwo)->props["foo"].type());
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state.tryUnify(&tableTwo, &tableOne);
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CHECK(state.failure);
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CHECK_EQ(1, state.errors.size());
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CHECK_NE(*getMutable<TableType>(&tableOne)->props["foo"].type(), *getMutable<TableType>(&tableTwo)->props["foo"].type());
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}
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TEST_CASE_FIXTURE(Fixture, "uninhabited_intersection_sub_never")
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{
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CheckResult result = check(R"(
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function f(arg : string & number) : never
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return arg
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end
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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}
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TEST_CASE_FIXTURE(Fixture, "uninhabited_intersection_sub_anything")
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{
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CheckResult result = check(R"(
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function f(arg : string & number) : boolean
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return arg
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end
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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}
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TEST_CASE_FIXTURE(Fixture, "uninhabited_table_sub_never")
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{
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DOES_NOT_PASS_NEW_SOLVER_GUARD();
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CheckResult result = check(R"(
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function f(arg : { prop : string & number }) : never
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return arg
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end
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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}
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TEST_CASE_FIXTURE(Fixture, "uninhabited_table_sub_anything")
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{
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DOES_NOT_PASS_NEW_SOLVER_GUARD();
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CheckResult result = check(R"(
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function f(arg : { prop : string & number }) : boolean
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return arg
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end
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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}
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TEST_CASE_FIXTURE(Fixture, "members_of_failed_typepack_unification_are_unified_with_errorType")
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{
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DOES_NOT_PASS_NEW_SOLVER_GUARD();
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CheckResult result = check(R"(
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function f(arg: number) end
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local a
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local b
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f(a, b)
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)");
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LUAU_REQUIRE_ERROR_COUNT(1, result);
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CHECK_EQ("number", toString(requireType("a")));
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CHECK_EQ("*error-type*", toString(requireType("b")));
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}
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TEST_CASE_FIXTURE(Fixture, "result_of_failed_typepack_unification_is_constrained")
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{
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DOES_NOT_PASS_NEW_SOLVER_GUARD();
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CheckResult result = check(R"(
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function f(arg: number) return arg end
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local a
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local b
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local c = f(a, b)
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)");
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LUAU_REQUIRE_ERROR_COUNT(1, result);
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CHECK_EQ("number", toString(requireType("a")));
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CHECK_EQ("*error-type*", toString(requireType("b")));
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CHECK_EQ("number", toString(requireType("c")));
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}
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TEST_CASE_FIXTURE(Fixture, "typepack_unification_should_trim_free_tails")
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{
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CheckResult result = check(R"(
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--!strict
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local function f(v: number)
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if v % 2 == 0 then
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return true
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end
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end
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return function()
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return (f(1))
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end
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)");
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LUAU_REQUIRE_ERROR_COUNT(1, result);
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CHECK_EQ("(number) -> boolean", toString(requireType("f")));
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}
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TEST_CASE_FIXTURE(TryUnifyFixture, "variadic_type_pack_unification")
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{
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TypePackVar testPack{TypePack{{builtinTypes->numberType, builtinTypes->stringType}, std::nullopt}};
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TypePackVar variadicPack{VariadicTypePack{builtinTypes->numberType}};
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state.tryUnify(&testPack, &variadicPack);
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CHECK(state.failure);
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CHECK(!state.errors.empty());
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}
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TEST_CASE_FIXTURE(TryUnifyFixture, "variadic_tails_respect_progress")
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{
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TypePackVar variadicPack{VariadicTypePack{builtinTypes->booleanType}};
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TypePackVar a{TypePack{{builtinTypes->numberType, builtinTypes->stringType, builtinTypes->booleanType, builtinTypes->booleanType}}};
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TypePackVar b{TypePack{{builtinTypes->numberType, builtinTypes->stringType}, &variadicPack}};
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state.tryUnify(&b, &a);
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CHECK(!state.failure);
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CHECK(state.errors.empty());
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}
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TEST_CASE_FIXTURE(Fixture, "variadics_should_use_reversed_properly")
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{
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CheckResult result = check(R"(
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--!strict
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local function f<T>(...: T): ...T
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return ...
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end
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local x: string = f(1)
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)");
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LUAU_REQUIRE_ERROR_COUNT(1, result);
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TypeMismatch* tm = get<TypeMismatch>(result.errors[0]);
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REQUIRE(tm);
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CHECK_EQ(toString(tm->givenType), "number");
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CHECK_EQ(toString(tm->wantedType), "string");
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}
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TEST_CASE_FIXTURE(BuiltinsFixture, "cli_41095_concat_log_in_sealed_table_unification")
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{
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CheckResult result = check(R"(
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--!strict
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table.insert()
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)");
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LUAU_REQUIRE_ERROR_COUNT(2, result);
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CHECK_EQ(toString(result.errors[0]), "No overload for function accepts 0 arguments.");
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if (FFlag::LuauSolverV2)
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CHECK_EQ(toString(result.errors[1]), "Available overloads: <V>({V}, V) -> (); and <V>({V}, number, V) -> ()");
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else
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CHECK_EQ(toString(result.errors[1]), "Available overloads: ({a}, a) -> (); and ({a}, number, a) -> ()");
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}
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TEST_CASE_FIXTURE(TryUnifyFixture, "free_tail_is_grown_properly")
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{
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TypePackId threeNumbers =
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arena.addTypePack(TypePack{{builtinTypes->numberType, builtinTypes->numberType, builtinTypes->numberType}, std::nullopt});
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TypePackId numberAndFreeTail = arena.addTypePack(TypePack{{builtinTypes->numberType}, arena.addTypePack(TypePackVar{FreeTypePack{TypeLevel{}}})});
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CHECK(state.canUnify(numberAndFreeTail, threeNumbers).empty());
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}
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TEST_CASE_FIXTURE(TryUnifyFixture, "recursive_metatable_getmatchtag")
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{
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Type redirect{FreeType{TypeLevel{}}};
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Type table{TableType{}};
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Type metatable{MetatableType{&redirect, &table}};
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redirect = BoundType{&metatable}; // Now we have a metatable that is recursive on the table type
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Type variant{UnionType{{&metatable, builtinTypes->numberType}}};
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state.tryUnify(&metatable, &variant);
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}
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TEST_CASE_FIXTURE(TryUnifyFixture, "cli_50320_follow_in_any_unification")
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{
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TypePackVar free{FreeTypePack{TypeLevel{}}};
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TypePackVar target{TypePack{}};
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Type func{FunctionType{&free, &free}};
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state.tryUnify(&free, &target);
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// Shouldn't assert or error.
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state.tryUnify(&func, builtinTypes->anyType);
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}
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TEST_CASE_FIXTURE(TryUnifyFixture, "txnlog_preserves_type_owner")
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{
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TypeId a = arena.addType(Type{FreeType{TypeLevel{}}});
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TypeId b = builtinTypes->numberType;
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state.tryUnify(a, b);
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state.log.commit();
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CHECK_EQ(a->owningArena, &arena);
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}
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TEST_CASE_FIXTURE(TryUnifyFixture, "txnlog_preserves_pack_owner")
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{
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TypePackId a = arena.addTypePack(TypePackVar{FreeTypePack{TypeLevel{}}});
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TypePackId b = builtinTypes->anyTypePack;
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state.tryUnify(a, b);
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state.log.commit();
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CHECK_EQ(a->owningArena, &arena);
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}
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TEST_CASE_FIXTURE(TryUnifyFixture, "metatables_unify_against_shape_of_free_table")
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{
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TableType::Props freeProps{
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{"foo", {builtinTypes->numberType}},
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};
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TypeId free = arena.addType(TableType{freeProps, std::nullopt, TypeLevel{}, TableState::Free});
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TableType::Props indexProps{
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{"foo", {builtinTypes->stringType}},
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};
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TypeId index = arena.addType(TableType{indexProps, std::nullopt, TypeLevel{}, TableState::Sealed});
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TableType::Props mtProps{
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{"__index", {index}},
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};
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TypeId mt = arena.addType(TableType{mtProps, std::nullopt, TypeLevel{}, TableState::Sealed});
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TypeId target = arena.addType(TableType{TableState::Unsealed, TypeLevel{}});
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TypeId metatable = arena.addType(MetatableType{target, mt});
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state.enableNewSolver();
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state.tryUnify(metatable, free);
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state.log.commit();
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REQUIRE_EQ(state.errors.size(), 1);
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const std::string expected = R"(Type
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'{ @metatable {| __index: {| foo: string |} |}, { } }'
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could not be converted into
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'{- foo: number -}'
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caused by:
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Type 'number' could not be converted into 'string')";
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CHECK_EQ(expected, toString(state.errors[0]));
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}
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TEST_CASE_FIXTURE(TryUnifyFixture, "fuzz_tail_unification_issue")
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{
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TypePackVar variadicAny{VariadicTypePack{builtinTypes->anyType}};
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TypePackVar packTmp{TypePack{{builtinTypes->anyType}, &variadicAny}};
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TypePackVar packSub{TypePack{{builtinTypes->anyType, builtinTypes->anyType}, &packTmp}};
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Type freeTy{FreeType{TypeLevel{}}};
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TypePackVar freeTp{FreeTypePack{TypeLevel{}}};
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TypePackVar packSuper{TypePack{{&freeTy}, &freeTp}};
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state.tryUnify(&packSub, &packSuper);
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}
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TEST_CASE_FIXTURE(BuiltinsFixture, "fuzz_unify_any_should_check_log")
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{
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CheckResult result = check(R"(
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repeat
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_._,_ = nil
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until _
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local l0:(any)&(typeof(_)),l0:(any)|(any) = _,_
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)");
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LUAU_REQUIRE_ERRORS(result);
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}
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static TypeId createTheType(TypeArena& arena, NotNull<BuiltinTypes> builtinTypes, Scope* scope, TypeId freeTy)
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{
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/*
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({|
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render: (
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(('a) -> ()) | {| current: 'a |}
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) -> nil
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|}) -> ()
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*/
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TypePackId emptyPack = arena.addTypePack({});
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return arena.addType(FunctionType{
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arena.addTypePack({arena.addType(TableType{
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TableType::Props{
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{{"render",
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Property(arena.addType(FunctionType{
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arena.addTypePack({arena.addType(UnionType{
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{arena.addType(FunctionType{arena.addTypePack({freeTy}), emptyPack}),
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arena.addType(TableType{TableType::Props{{"current", {freeTy}}}, std::nullopt, TypeLevel{}, scope, TableState::Sealed})}
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})}),
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arena.addTypePack({builtinTypes->nilType})
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}))}}
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},
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std::nullopt,
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TypeLevel{},
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scope,
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TableState::Sealed
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})}),
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emptyPack
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});
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};
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// See CLI-71190
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TEST_CASE_FIXTURE(TryUnifyFixture, "unifying_two_unions_under_dcr_does_not_create_a_BoundType_cycle")
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{
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const std::shared_ptr<Scope> scope = globalScope;
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const std::shared_ptr<Scope> nestedScope = std::make_shared<Scope>(scope);
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const TypeId outerType = arena.freshType(scope.get());
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const TypeId outerType2 = arena.freshType(scope.get());
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const TypeId innerType = arena.freshType(nestedScope.get());
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state.enableNewSolver();
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SUBCASE("equal_scopes")
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{
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TypeId one = createTheType(arena, builtinTypes, scope.get(), outerType);
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TypeId two = createTheType(arena, builtinTypes, scope.get(), outerType2);
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state.tryUnify(one, two);
|
|
state.log.commit();
|
|
|
|
ToStringOptions opts;
|
|
|
|
CHECK(follow(outerType) == follow(outerType2));
|
|
}
|
|
|
|
SUBCASE("outer_scope_is_subtype")
|
|
{
|
|
TypeId one = createTheType(arena, builtinTypes, scope.get(), outerType);
|
|
TypeId two = createTheType(arena, builtinTypes, scope.get(), innerType);
|
|
|
|
state.tryUnify(one, two);
|
|
state.log.commit();
|
|
|
|
ToStringOptions opts;
|
|
|
|
CHECK(follow(outerType) == follow(innerType));
|
|
|
|
// The scope of outerType exceeds that of innerType. The latter should be bound to the former.
|
|
const BoundType* bt = get_if<BoundType>(&innerType->ty);
|
|
REQUIRE(bt);
|
|
CHECK(bt->boundTo == outerType);
|
|
}
|
|
|
|
SUBCASE("outer_scope_is_supertype")
|
|
{
|
|
TypeId one = createTheType(arena, builtinTypes, scope.get(), innerType);
|
|
TypeId two = createTheType(arena, builtinTypes, scope.get(), outerType);
|
|
|
|
state.tryUnify(one, two);
|
|
state.log.commit();
|
|
|
|
ToStringOptions opts;
|
|
|
|
CHECK(follow(outerType) == follow(innerType));
|
|
|
|
// The scope of outerType exceeds that of innerType. The latter should be bound to the former.
|
|
const BoundType* bt = get_if<BoundType>(&innerType->ty);
|
|
REQUIRE(bt);
|
|
CHECK(bt->boundTo == outerType);
|
|
}
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(BuiltinsFixture, "table_unification_full_restart_recursion")
|
|
{
|
|
ScopedFastFlag luauUnifierRecursionOnRestart{FFlag::LuauUnifierRecursionOnRestart, true};
|
|
|
|
CheckResult result = check(R"(
|
|
local A, B, C, D
|
|
|
|
E = function(a, b)
|
|
local mt = getmetatable(b)
|
|
if mt.tm:bar(A) == nil and mt.tm:bar(B) == nil then end
|
|
if mt.foo == true then D(b, 3) end
|
|
mt.foo:call(false, b)
|
|
end
|
|
|
|
A = function(a, b)
|
|
local mt = getmetatable(b)
|
|
if mt.foo == true then D(b, 3) end
|
|
C(mt, 3)
|
|
end
|
|
|
|
B = function(a, b)
|
|
local mt = getmetatable(b)
|
|
if mt.foo == true then D(b, 3) end
|
|
C(mt, 3)
|
|
end
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERRORS(result);
|
|
}
|
|
|
|
TEST_SUITE_END();
|