public void testTightenDependsOnTightenedMethods() throws Exception {
addSnippetClassDecl("abstract static class A {}");
addSnippetClassDecl("static class B extends A {}");
addSnippetClassDecl("static A test() { return new B(); }");
// test should be tightened to be static EntryPoint$B test();
addSnippetClassDecl("static class C {A a;}");
addSnippetClassDecl("static void fun1(A a) {if (a == null) return;}");
addSnippetClassDecl("static A fun2() { return test(); }"); // tighten method return type
Result result =
optimize(
"void",
"A a = test();" // tighten local varialbe.
+ "C c = new C(); c.a = test();" // tighten field
+ "fun1(test());" // tighten parameter
);
assertEquals("static EntryPoint$B fun2();\n", result.findMethod("fun2").toString());
assertEquals(
"EntryPoint$B a",
OptimizerTestBase.findLocal(result.findMethod(MAIN_METHOD_NAME), "a").toString());
assertEquals(
"EntryPoint$B a",
OptimizerTestBase.findField(result.findClass("EntryPoint$C"), "a").toString());
assertEquals("static void fun1(EntryPoint$B a);\n", result.findMethod("fun1").toString());
}
public void testMethodBasedOnLeafType() throws Exception {
addSnippetClassDecl("abstract static class A { void makeSureFunIsCalled() {fun(this);} }");
addSnippetClassDecl("static class B extends A {}");
addSnippetClassDecl("static A fun(A a) {return a;}");
Result result = optimize("void", "");
assertEquals("static EntryPoint$B fun(EntryPoint$B a);\n", result.findMethod("fun").toString());
}
public void testTightenParameterBasedOnAssignment() throws Exception {
addSnippetClassDecl("static class A { }");
addSnippetClassDecl("static class B extends A { }");
addSnippetClassDecl("static class C extends B { }");
addSnippetClassDecl("static class D extends B { }");
addSnippetClassDecl("static void test(A a) { }");
Result result = optimize("void", "C c = new C(); D d = new D(); test(c); test(d);");
assertEquals("static void test(EntryPoint$B a);\n", result.findMethod("test").toString());
}
public void testMethodBasedOnReturns() throws Exception {
addSnippetClassDecl("static class A {}");
addSnippetClassDecl("static class B extends A {}");
addSnippetClassDecl("static class C extends B {}");
addSnippetClassDecl("static class D extends B {}");
addSnippetClassDecl(
"A fun(int a) { if(a<0) return new B(); else if(a==0) return new C(); return new D();}");
Result result = optimize("void", "");
assertEquals("EntryPoint$B fun(int a);\n", result.findMethod("fun").toString());
}