mirror of
https://github.com/luau-lang/luau.git
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415 lines
9.5 KiB
C++
415 lines
9.5 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/TopoSortStatements.h"
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#include "Luau/Transpiler.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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static std::vector<AstStat*> toposort(AstStatBlock& block)
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{
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std::vector<AstStat*> result{block.body.begin(), block.body.end()};
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Luau::toposort(result);
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return result;
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}
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TEST_SUITE_BEGIN("TopoSortTests");
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TEST_CASE_FIXTURE(Fixture, "sorts")
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{
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AstStatBlock* program = parse(R"(
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function A()
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return B("high five!")
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end
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function B(x)
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return x
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end
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)");
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auto sorted = toposort(*program);
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REQUIRE_EQ(2, sorted.size());
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AstStatBlock* block = program->as<AstStatBlock>();
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REQUIRE(block != nullptr);
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REQUIRE_EQ(2, block->body.size);
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// B is sorted ahead of A
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CHECK_EQ(block->body.data[1], sorted[0]);
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CHECK_EQ(block->body.data[0], sorted[1]);
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}
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TEST_CASE_FIXTURE(Fixture, "cyclic_dependency_terminates")
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{
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AstStatBlock* program = parse(R"(
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function A()
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return B()
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end
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function B()
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return A()
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end
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)");
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auto sorted = toposort(*program);
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REQUIRE_EQ(2, sorted.size());
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}
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TEST_CASE_FIXTURE(Fixture, "doesnt_omit_statements_that_dont_need_sorting")
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{
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AstStatBlock* program = parse(R"(
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local X = {}
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function A()
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return B(5), B("Hi")
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end
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local Y = {}
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function B(x)
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return x
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end
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local Z = B()
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)");
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auto sorted = toposort(*program);
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REQUIRE_EQ(5, sorted.size());
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AstStatBlock* block = program->as<AstStatBlock>();
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REQUIRE(block != nullptr);
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REQUIRE_EQ(5, block->body.size);
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AstStat* X = block->body.data[0];
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AstStat* A = block->body.data[1];
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AstStat* Y = block->body.data[2];
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AstStat* B = block->body.data[3];
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AstStat* Z = block->body.data[4];
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CHECK_EQ(sorted[0], X);
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CHECK_EQ(sorted[1], Y);
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CHECK_EQ(sorted[2], B);
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CHECK_EQ(sorted[3], Z);
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CHECK_EQ(sorted[4], A);
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}
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TEST_CASE_FIXTURE(Fixture, "slightly_more_complex")
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{
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AstStatBlock* program = parse(R"(
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local T = {}
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function T:foo()
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return T:bar(999), T:bar("hi")
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end
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function T:bar(i)
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return i
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end
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)");
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auto sorted = toposort(*program);
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REQUIRE_EQ(3, sorted.size());
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CHECK_EQ(sorted[0], program->body.data[0]);
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CHECK_EQ(sorted[1], program->body.data[2]);
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CHECK_EQ(sorted[2], program->body.data[1]);
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}
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TEST_CASE_FIXTURE(Fixture, "reorder_functions_after_dependent_assigns")
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{
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AstStatBlock* program = parse(R"(
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local T = {} -- 0
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function T.a() -- 1 depends on (2)
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T.b()
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end
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function T.b() -- 2 depends on (4)
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T.c()
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end
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function make_function() -- 3
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return function() end
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end
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T.c = make_function() -- 4 depends on (3)
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T.a() -- 5 depends on (1)
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)");
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auto sorted = toposort(*program);
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REQUIRE_EQ(6, sorted.size());
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CHECK_EQ(sorted[0], program->body.data[0]);
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CHECK_EQ(sorted[1], program->body.data[3]);
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CHECK_EQ(sorted[2], program->body.data[4]);
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CHECK_EQ(sorted[3], program->body.data[2]);
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CHECK_EQ(sorted[4], program->body.data[1]);
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CHECK_EQ(sorted[5], program->body.data[5]);
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}
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TEST_CASE_FIXTURE(Fixture, "dont_reorder_assigns")
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{
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AstStatBlock* program = parse(R"(
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local T = {} -- 0
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function T.a() -- 1 depends on (2)
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T.b()
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end
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function T.b() -- 2 depends on (5)
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T.c()
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end
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function make_function() -- 3
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return function() end
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end
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T.a() -- 4 depends on (1 -> 2 -> 5), but we cannot reorder it after 5!
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T.c = make_function() -- 5 depends on (3)
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)");
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auto sorted = toposort(*program);
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REQUIRE_EQ(6, sorted.size());
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CHECK_EQ(sorted[0], program->body.data[0]);
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CHECK_EQ(sorted[1], program->body.data[3]);
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CHECK_EQ(sorted[2], program->body.data[2]);
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CHECK_EQ(sorted[3], program->body.data[1]);
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CHECK_EQ(sorted[4], program->body.data[4]);
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CHECK_EQ(sorted[5], program->body.data[5]);
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}
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TEST_CASE_FIXTURE(Fixture, "dont_reorder_function_after_assignment_to_global")
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{
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AstStatBlock* program = parse(R"(
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local f
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function g()
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f()
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end
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f = function() end
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)");
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auto sorted = toposort(*program);
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REQUIRE_EQ(3, sorted.size());
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CHECK_EQ(sorted[0], program->body.data[0]);
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CHECK_EQ(sorted[1], program->body.data[1]);
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CHECK_EQ(sorted[2], program->body.data[2]);
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}
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TEST_CASE_FIXTURE(Fixture, "local_functions_need_sorting_too")
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{
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AstStatBlock* program = parse(R"(
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local a = nil -- 0
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local function f() -- 1 depends on 4
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a.c = 4
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end
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local function g() -- 2 depends on 1
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f()
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end
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a = {} -- 3
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a.c = nil -- 4
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)");
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auto sorted = toposort(*program);
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REQUIRE_EQ(5, sorted.size());
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CHECK_EQ(sorted[0], program->body.data[0]);
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CHECK_EQ(sorted[1], program->body.data[3]);
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CHECK_EQ(sorted[2], program->body.data[4]);
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CHECK_EQ(sorted[3], program->body.data[1]);
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CHECK_EQ(sorted[4], program->body.data[2]);
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}
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TEST_CASE_FIXTURE(Fixture, "dont_force_checking_until_an_AstExprCall_needs_the_symbol")
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{
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AstStatBlock* program = parse(R"(
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function A(obj)
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C(obj)
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end
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local B = A -- It would be an error to force checking of A at this point just because the definition of B is an imperative
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function C(player)
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end
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local D = A(nil) -- The real dependency on A is here, where A is invoked.
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)");
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auto sorted = toposort(*program);
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REQUIRE_EQ(4, sorted.size());
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auto A = program->body.data[0];
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auto B = program->body.data[1];
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auto C = program->body.data[2];
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auto D = program->body.data[3];
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CHECK_EQ(sorted[0], C);
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CHECK_EQ(sorted[1], A);
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CHECK_EQ(sorted[2], B);
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CHECK_EQ(sorted[3], D);
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}
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TEST_CASE_FIXTURE(Fixture, "dont_reorder_imperatives")
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{
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AstStatBlock* program = parse(R"(
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local temp = work
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work = arr
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arr = temp
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width = width * 2
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)");
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auto sorted = toposort(*program);
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REQUIRE_EQ(4, sorted.size());
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}
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TEST_CASE_FIXTURE(Fixture, "sort_typealias_first")
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{
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AstStatBlock* program = parse(R"(
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local foo: A = 1
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type A = number
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)");
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auto sorted = toposort(*program);
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REQUIRE_EQ(2, sorted.size());
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auto A = program->body.data[0];
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auto B = program->body.data[1];
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CHECK_EQ(sorted[0], B);
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CHECK_EQ(sorted[1], A);
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}
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TEST_CASE_FIXTURE(Fixture, "typealias_of_typeof_is_not_sorted")
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{
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AstStatBlock* program = parse(R"(
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type Foo = typeof(foo)
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local function foo(x: number) end
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)");
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auto sorted = toposort(*program);
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REQUIRE_EQ(2, sorted.size());
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auto A = program->body.data[0];
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auto B = program->body.data[1];
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CHECK_EQ(sorted[0], A);
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CHECK_EQ(sorted[1], B);
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}
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TEST_CASE_FIXTURE(Fixture, "nested_type_annotations_depends_on_later_typealiases")
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{
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AstStatBlock* program = parse(R"(
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type Foo = A | B
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type B = number
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type A = string
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)");
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auto sorted = toposort(*program);
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REQUIRE_EQ(3, sorted.size());
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auto Foo = program->body.data[0];
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auto B = program->body.data[1];
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auto A = program->body.data[2];
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CHECK_EQ(sorted[0], B);
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CHECK_EQ(sorted[1], A);
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CHECK_EQ(sorted[2], Foo);
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}
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TEST_CASE_FIXTURE(Fixture, "return_comes_last")
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{
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AstStatBlock* program = parse(R"(
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local module = {}
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local function confuseCompiler() return module.foo() end
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module.foo = function() return "" end
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function module.bar(x:number)
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confuseCompiler()
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return true
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end
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return module
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)");
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auto sorted = toposort(*program);
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CHECK_EQ(sorted[0], program->body.data[0]);
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CHECK_EQ(sorted[2], program->body.data[1]);
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CHECK_EQ(sorted[1], program->body.data[2]);
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CHECK_EQ(sorted[3], program->body.data[3]);
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CHECK_EQ(sorted[4], program->body.data[4]);
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}
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TEST_CASE_FIXTURE(Fixture, "break_comes_last")
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{
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AstStatBlock* program = parse(R"(
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repeat
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local module = {}
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local function confuseCompiler() return module.foo() end
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module.foo = function() return "" end
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break
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until true
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)");
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REQUIRE(program->body.size == 1);
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auto repeat = program->body.data[0]->as<AstStatRepeat>();
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REQUIRE(repeat);
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REQUIRE(repeat->body->body.size == 4);
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auto sorted = toposort(*repeat->body);
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REQUIRE(sorted.size() == 4);
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CHECK_EQ(sorted[3], repeat->body->body.data[3]);
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}
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TEST_CASE_FIXTURE(Fixture, "continue_comes_last")
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{
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AstStatBlock* program = parse(R"(
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repeat
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local module = {}
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local function confuseCompiler() return module.foo() end
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module.foo = function() return "" end
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continue
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until true
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)");
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REQUIRE(program->body.size == 1);
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auto repeat = program->body.data[0]->as<AstStatRepeat>();
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REQUIRE(repeat);
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REQUIRE(repeat->body->body.size == 4);
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auto sorted = toposort(*repeat->body);
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REQUIRE(sorted.size() == 4);
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CHECK_EQ(sorted[3], repeat->body->body.data[3]);
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}
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TEST_SUITE_END();
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