380 lines
12 KiB
C++
380 lines
12 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/Scope.h"
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#include "Luau/TypeInfer.h"
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#include "Luau/TypeVar.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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struct TryUnifyFixture : Fixture
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{
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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, singletonTypes, NotNull{&unifierState}};
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Unifier state{NotNull{&normalizer}, Mode::Strict, 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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TypeVar numberOne{TypeVariant{PrimitiveTypeVar{PrimitiveTypeVar::Number}}};
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TypeVar numberTwo = numberOne;
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state.tryUnify(&numberTwo, &numberOne);
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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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TypeVar functionOne{
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TypeVariant{FunctionTypeVar(arena.addTypePack({arena.freshType(globalScope->level)}), arena.addTypePack({typeChecker.numberType}))}};
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TypeVar functionTwo{TypeVariant{
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FunctionTypeVar(arena.addTypePack({arena.freshType(globalScope->level)}), arena.addTypePack({arena.freshType(globalScope->level)}))}};
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state.tryUnify(&functionTwo, &functionOne);
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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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TypeVar functionOne{
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TypeVariant{FunctionTypeVar(arena.addTypePack({arena.freshType(globalScope->level)}), arena.addTypePack({typeChecker.numberType}))}};
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TypeVar functionOneSaved = functionOne;
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TypePackVar argPackTwo{TypePack{{arena.freshType(globalScope->level)}, std::nullopt}};
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TypeVar functionTwo{
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TypeVariant{FunctionTypeVar(arena.addTypePack({arena.freshType(globalScope->level)}), arena.addTypePack({typeChecker.stringType}))}};
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TypeVar functionTwoSaved = functionTwo;
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state.tryUnify(&functionTwo, &functionOne);
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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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TypeVar tableOne{TypeVariant{
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TableTypeVar{{{"foo", {arena.freshType(globalScope->level)}}}, std::nullopt, globalScope->level, TableState::Unsealed},
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}};
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TypeVar tableTwo{TypeVariant{
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TableTypeVar{{{"foo", {arena.freshType(globalScope->level)}}}, std::nullopt, globalScope->level, TableState::Unsealed},
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}};
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CHECK_NE(*getMutable<TableTypeVar>(&tableOne)->props["foo"].type, *getMutable<TableTypeVar>(&tableTwo)->props["foo"].type);
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state.tryUnify(&tableTwo, &tableOne);
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CHECK(state.errors.empty());
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state.log.commit();
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CHECK_EQ(*getMutable<TableTypeVar>(&tableOne)->props["foo"].type, *getMutable<TableTypeVar>(&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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TypeVar tableOne{TypeVariant{
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TableTypeVar{{{"foo", {arena.freshType(globalScope->level)}}, {"bar", {typeChecker.numberType}}}, std::nullopt, globalScope->level,
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TableState::Unsealed},
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}};
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TypeVar tableTwo{TypeVariant{
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TableTypeVar{{{"foo", {arena.freshType(globalScope->level)}}, {"bar", {typeChecker.stringType}}}, std::nullopt, globalScope->level,
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TableState::Unsealed},
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}};
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CHECK_NE(*getMutable<TableTypeVar>(&tableOne)->props["foo"].type, *getMutable<TableTypeVar>(&tableTwo)->props["foo"].type);
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state.tryUnify(&tableTwo, &tableOne);
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CHECK_EQ(1, state.errors.size());
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CHECK_NE(*getMutable<TableTypeVar>(&tableOne)->props["foo"].type, *getMutable<TableTypeVar>(&tableTwo)->props["foo"].type);
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}
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TEST_CASE_FIXTURE(TryUnifyFixture, "uninhabited_intersection_sub_never")
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{
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ScopedFastFlag sffs[]{
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{"LuauSubtypeNormalizer", true},
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{"LuauTypeNormalization2", true},
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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(TryUnifyFixture, "uninhabited_intersection_sub_anything")
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{
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ScopedFastFlag sffs[]{
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{"LuauSubtypeNormalizer", true},
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{"LuauTypeNormalization2", true},
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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(TryUnifyFixture, "uninhabited_table_sub_never")
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{
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ScopedFastFlag sffs[]{
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{"LuauSubtypeNormalizer", true},
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{"LuauTypeNormalization2", true},
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{"LuauUninhabitedSubAnything", true},
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};
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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(TryUnifyFixture, "uninhabited_table_sub_anything")
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{
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ScopedFastFlag sffs[]{
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{"LuauSubtypeNormalizer", true},
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{"LuauTypeNormalization2", true},
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{"LuauUninhabitedSubAnything", true},
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};
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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(TryUnifyFixture, "members_of_failed_typepack_unification_are_unified_with_errorType")
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{
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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("a", 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(TryUnifyFixture, "result_of_failed_typepack_unification_is_constrained")
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{
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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("a", 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(TryUnifyFixture, "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{{typeChecker.numberType, typeChecker.stringType}, std::nullopt}};
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TypePackVar variadicPack{VariadicTypePack{typeChecker.numberType}};
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state.tryUnify(&testPack, &variadicPack);
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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{typeChecker.booleanType}};
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TypePackVar a{TypePack{{typeChecker.numberType, typeChecker.stringType, typeChecker.booleanType, typeChecker.booleanType}}};
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TypePackVar b{TypePack{{typeChecker.numberType, typeChecker.stringType}, &variadicPack}};
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state.tryUnify(&b, &a);
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CHECK(state.errors.empty());
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}
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TEST_CASE_FIXTURE(TryUnifyFixture, "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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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 = arena.addTypePack(TypePack{{typeChecker.numberType, typeChecker.numberType, typeChecker.numberType}, std::nullopt});
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TypePackId numberAndFreeTail = arena.addTypePack(TypePack{{typeChecker.numberType}, arena.addTypePack(TypePackVar{FreeTypePack{TypeLevel{}}})});
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ErrorVec unifyErrors = state.canUnify(numberAndFreeTail, threeNumbers);
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CHECK(unifyErrors.size() == 0);
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}
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TEST_CASE_FIXTURE(TryUnifyFixture, "recursive_metatable_getmatchtag")
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{
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TypeVar redirect{FreeTypeVar{TypeLevel{}}};
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TypeVar table{TableTypeVar{}};
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TypeVar metatable{MetatableTypeVar{&redirect, &table}};
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redirect = BoundTypeVar{&metatable}; // Now we have a metatable that is recursive on the table type
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TypeVar variant{UnionTypeVar{{&metatable, typeChecker.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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TypeVar func{FunctionTypeVar{&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, typeChecker.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(TypeVar{FreeTypeVar{TypeLevel{}}});
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TypeId b = typeChecker.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 = typeChecker.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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ScopedFastFlag sff("DebugLuauDeferredConstraintResolution", true);
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TableTypeVar::Props freeProps{
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{"foo", {typeChecker.numberType}},
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};
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TypeId free = arena.addType(TableTypeVar{freeProps, std::nullopt, TypeLevel{}, TableState::Free});
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TableTypeVar::Props indexProps{
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{"foo", {typeChecker.stringType}},
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};
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TypeId index = arena.addType(TableTypeVar{indexProps, std::nullopt, TypeLevel{}, TableState::Sealed});
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TableTypeVar::Props mtProps{
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{"__index", {index}},
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};
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TypeId mt = arena.addType(TableTypeVar{mtProps, std::nullopt, TypeLevel{}, TableState::Sealed});
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TypeId target = arena.addType(TableTypeVar{TableState::Unsealed, TypeLevel{}});
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TypeId metatable = arena.addType(MetatableTypeVar{target, mt});
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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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std::string expected = "Type '{ @metatable {| __index: {| foo: string |} |}, { } }' could not be converted into '{- foo: number -}'\n"
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"caused by:\n"
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" Type 'number' could not be converted into 'string'";
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CHECK_EQ(toString(state.errors[0]), expected);
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}
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TEST_CASE_FIXTURE(TryUnifyFixture, "fuzz_tail_unification_issue")
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{
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ScopedFastFlag luauTxnLogTypePackIterator{"LuauTxnLogTypePackIterator", true};
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TypePackVar variadicAny{VariadicTypePack{typeChecker.anyType}};
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TypePackVar packTmp{TypePack{{typeChecker.anyType}, &variadicAny}};
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TypePackVar packSub{TypePack{{typeChecker.anyType, typeChecker.anyType}, &packTmp}};
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TypeVar freeTy{FreeTypeVar{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_SUITE_END();
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