406 lines
11 KiB
C++
406 lines
11 KiB
C++
//===---------- llvm/unittest/Support/Casting.cpp - Casting tests ---------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/Casting.h"
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#include "llvm/IR/User.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/raw_ostream.h"
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#include "gtest/gtest.h"
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#include <cstdlib>
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namespace llvm {
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// Used to test illegal cast. If a cast doesn't match any of the "real" ones,
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// it will match this one.
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struct IllegalCast;
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template <typename T> IllegalCast *cast(...) { return nullptr; }
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// set up two example classes
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// with conversion facility
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//
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struct bar {
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bar() {}
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struct foo *baz();
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struct foo *caz();
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struct foo *daz();
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struct foo *naz();
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private:
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bar(const bar &);
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};
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struct foo {
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void ext() const;
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/* static bool classof(const bar *X) {
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cerr << "Classof: " << X << "\n";
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return true;
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}*/
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};
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struct base {
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virtual ~base() {}
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};
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struct derived : public base {
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static bool classof(const base *B) { return true; }
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};
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template <> struct isa_impl<foo, bar> {
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static inline bool doit(const bar &Val) {
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dbgs() << "Classof: " << &Val << "\n";
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return true;
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}
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};
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template <typename T> struct isa_impl<foo, T> {
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static inline bool doit(const T &Val) { return false; }
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};
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foo *bar::baz() {
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return cast<foo>(this);
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}
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foo *bar::caz() {
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return cast_or_null<foo>(this);
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}
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foo *bar::daz() {
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return dyn_cast<foo>(this);
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}
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foo *bar::naz() {
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return dyn_cast_or_null<foo>(this);
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}
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bar *fub();
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template <> struct simplify_type<foo> {
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typedef int SimpleType;
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static SimpleType getSimplifiedValue(foo &Val) { return 0; }
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};
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} // End llvm namespace
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using namespace llvm;
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// Test the peculiar behavior of Use in simplify_type.
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static_assert(std::is_same<simplify_type<Use>::SimpleType, Value *>::value,
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"Use doesn't simplify correctly!");
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static_assert(std::is_same<simplify_type<Use *>::SimpleType, Value *>::value,
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"Use doesn't simplify correctly!");
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// Test that a regular class behaves as expected.
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static_assert(std::is_same<simplify_type<foo>::SimpleType, int>::value,
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"Unexpected simplify_type result!");
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static_assert(std::is_same<simplify_type<foo *>::SimpleType, foo *>::value,
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"Unexpected simplify_type result!");
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namespace {
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const foo *null_foo = nullptr;
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bar B;
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extern bar &B1;
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bar &B1 = B;
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extern const bar *B2;
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// test various configurations of const
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const bar &B3 = B1;
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const bar *const B4 = B2;
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TEST(CastingTest, isa) {
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EXPECT_TRUE(isa<foo>(B1));
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EXPECT_TRUE(isa<foo>(B2));
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EXPECT_TRUE(isa<foo>(B3));
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EXPECT_TRUE(isa<foo>(B4));
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}
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TEST(CastingTest, cast) {
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foo &F1 = cast<foo>(B1);
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EXPECT_NE(&F1, null_foo);
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const foo *F3 = cast<foo>(B2);
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EXPECT_NE(F3, null_foo);
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const foo *F4 = cast<foo>(B2);
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EXPECT_NE(F4, null_foo);
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const foo &F5 = cast<foo>(B3);
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EXPECT_NE(&F5, null_foo);
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const foo *F6 = cast<foo>(B4);
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EXPECT_NE(F6, null_foo);
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// Can't pass null pointer to cast<>.
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// foo *F7 = cast<foo>(fub());
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// EXPECT_EQ(F7, null_foo);
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foo *F8 = B1.baz();
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EXPECT_NE(F8, null_foo);
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std::unique_ptr<const bar> BP(B2);
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auto FP = cast<foo>(std::move(BP));
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static_assert(std::is_same<std::unique_ptr<const foo>, decltype(FP)>::value,
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"Incorrect deduced return type!");
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EXPECT_NE(FP.get(), null_foo);
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FP.release();
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}
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TEST(CastingTest, cast_or_null) {
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const foo *F11 = cast_or_null<foo>(B2);
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EXPECT_NE(F11, null_foo);
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const foo *F12 = cast_or_null<foo>(B2);
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EXPECT_NE(F12, null_foo);
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const foo *F13 = cast_or_null<foo>(B4);
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EXPECT_NE(F13, null_foo);
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const foo *F14 = cast_or_null<foo>(fub()); // Shouldn't print.
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EXPECT_EQ(F14, null_foo);
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foo *F15 = B1.caz();
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EXPECT_NE(F15, null_foo);
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std::unique_ptr<const bar> BP(fub());
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auto FP = cast_or_null<foo>(std::move(BP));
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EXPECT_EQ(FP.get(), null_foo);
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}
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TEST(CastingTest, dyn_cast) {
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const foo *F1 = dyn_cast<foo>(B2);
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EXPECT_NE(F1, null_foo);
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const foo *F2 = dyn_cast<foo>(B2);
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EXPECT_NE(F2, null_foo);
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const foo *F3 = dyn_cast<foo>(B4);
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EXPECT_NE(F3, null_foo);
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// Can't pass null pointer to dyn_cast<>.
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// foo *F4 = dyn_cast<foo>(fub());
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// EXPECT_EQ(F4, null_foo);
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foo *F5 = B1.daz();
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EXPECT_NE(F5, null_foo);
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}
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TEST(CastingTest, dyn_cast_or_null) {
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const foo *F1 = dyn_cast_or_null<foo>(B2);
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EXPECT_NE(F1, null_foo);
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const foo *F2 = dyn_cast_or_null<foo>(B2);
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EXPECT_NE(F2, null_foo);
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const foo *F3 = dyn_cast_or_null<foo>(B4);
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EXPECT_NE(F3, null_foo);
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foo *F4 = dyn_cast_or_null<foo>(fub());
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EXPECT_EQ(F4, null_foo);
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foo *F5 = B1.naz();
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EXPECT_NE(F5, null_foo);
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}
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std::unique_ptr<derived> newd() { return llvm::make_unique<derived>(); }
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std::unique_ptr<base> newb() { return llvm::make_unique<derived>(); }
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TEST(CastingTest, unique_dyn_cast) {
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derived *OrigD = nullptr;
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auto D = llvm::make_unique<derived>();
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OrigD = D.get();
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// Converting from D to itself is valid, it should return a new unique_ptr
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// and the old one should become nullptr.
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auto NewD = unique_dyn_cast<derived>(D);
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ASSERT_EQ(OrigD, NewD.get());
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ASSERT_EQ(nullptr, D);
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// Converting from D to B is valid, B should have a value and D should be
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// nullptr.
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auto B = unique_dyn_cast<base>(NewD);
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ASSERT_EQ(OrigD, B.get());
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ASSERT_EQ(nullptr, NewD);
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// Converting from B to itself is valid, it should return a new unique_ptr
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// and the old one should become nullptr.
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auto NewB = unique_dyn_cast<base>(B);
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ASSERT_EQ(OrigD, NewB.get());
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ASSERT_EQ(nullptr, B);
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// Converting from B to D is valid, D should have a value and B should be
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// nullptr;
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D = unique_dyn_cast<derived>(NewB);
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ASSERT_EQ(OrigD, D.get());
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ASSERT_EQ(nullptr, NewB);
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// Converting between unrelated types should fail. The original value should
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// remain unchanged and it should return nullptr.
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auto F = unique_dyn_cast<foo>(D);
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ASSERT_EQ(nullptr, F);
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ASSERT_EQ(OrigD, D.get());
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// All of the above should also hold for temporaries.
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auto D2 = unique_dyn_cast<derived>(newd());
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EXPECT_NE(nullptr, D2);
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auto B2 = unique_dyn_cast<derived>(newb());
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EXPECT_NE(nullptr, B2);
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auto B3 = unique_dyn_cast<base>(newb());
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EXPECT_NE(nullptr, B3);
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auto F2 = unique_dyn_cast<foo>(newb());
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EXPECT_EQ(nullptr, F2);
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}
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// These lines are errors...
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//foo *F20 = cast<foo>(B2); // Yields const foo*
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//foo &F21 = cast<foo>(B3); // Yields const foo&
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//foo *F22 = cast<foo>(B4); // Yields const foo*
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//foo &F23 = cast_or_null<foo>(B1);
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//const foo &F24 = cast_or_null<foo>(B3);
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const bar *B2 = &B;
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} // anonymous namespace
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bar *llvm::fub() { return nullptr; }
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namespace {
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namespace inferred_upcasting {
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// This test case verifies correct behavior of inferred upcasts when the
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// types are statically known to be OK to upcast. This is the case when,
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// for example, Derived inherits from Base, and we do `isa<Base>(Derived)`.
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// Note: This test will actually fail to compile without inferred
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// upcasting.
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class Base {
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public:
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// No classof. We are testing that the upcast is inferred.
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Base() {}
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};
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class Derived : public Base {
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public:
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Derived() {}
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};
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// Even with no explicit classof() in Base, we should still be able to cast
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// Derived to its base class.
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TEST(CastingTest, UpcastIsInferred) {
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Derived D;
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EXPECT_TRUE(isa<Base>(D));
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Base *BP = dyn_cast<Base>(&D);
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EXPECT_TRUE(BP != nullptr);
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}
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// This test verifies that the inferred upcast takes precedence over an
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// explicitly written one. This is important because it verifies that the
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// dynamic check gets optimized away.
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class UseInferredUpcast {
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public:
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int Dummy;
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static bool classof(const UseInferredUpcast *) {
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return false;
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}
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};
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TEST(CastingTest, InferredUpcastTakesPrecedence) {
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UseInferredUpcast UIU;
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// Since the explicit classof() returns false, this will fail if the
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// explicit one is used.
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EXPECT_TRUE(isa<UseInferredUpcast>(&UIU));
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}
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} // end namespace inferred_upcasting
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} // end anonymous namespace
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// Test that we reject casts of temporaries (and so the illegal cast gets used).
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namespace TemporaryCast {
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struct pod {};
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IllegalCast *testIllegalCast() { return cast<foo>(pod()); }
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}
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namespace {
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namespace pointer_wrappers {
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struct Base {
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bool IsDerived;
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Base(bool IsDerived = false) : IsDerived(IsDerived) {}
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};
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struct Derived : Base {
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Derived() : Base(true) {}
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static bool classof(const Base *B) { return B->IsDerived; }
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};
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class PTy {
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Base *B;
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public:
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PTy(Base *B) : B(B) {}
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explicit operator bool() const { return get(); }
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Base *get() const { return B; }
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};
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} // end namespace pointer_wrappers
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} // end namespace
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namespace llvm {
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template <> struct simplify_type<pointer_wrappers::PTy> {
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typedef pointer_wrappers::Base *SimpleType;
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static SimpleType getSimplifiedValue(pointer_wrappers::PTy &P) {
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return P.get();
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}
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};
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template <> struct simplify_type<const pointer_wrappers::PTy> {
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typedef pointer_wrappers::Base *SimpleType;
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static SimpleType getSimplifiedValue(const pointer_wrappers::PTy &P) {
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return P.get();
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}
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};
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} // end namespace llvm
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namespace {
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namespace pointer_wrappers {
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// Some objects.
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pointer_wrappers::Base B;
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pointer_wrappers::Derived D;
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// Mutable "smart" pointers.
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pointer_wrappers::PTy MN(nullptr);
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pointer_wrappers::PTy MB(&B);
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pointer_wrappers::PTy MD(&D);
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// Const "smart" pointers.
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const pointer_wrappers::PTy CN(nullptr);
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const pointer_wrappers::PTy CB(&B);
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const pointer_wrappers::PTy CD(&D);
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TEST(CastingTest, smart_isa) {
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EXPECT_TRUE(!isa<pointer_wrappers::Derived>(MB));
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EXPECT_TRUE(!isa<pointer_wrappers::Derived>(CB));
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EXPECT_TRUE(isa<pointer_wrappers::Derived>(MD));
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EXPECT_TRUE(isa<pointer_wrappers::Derived>(CD));
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}
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TEST(CastingTest, smart_cast) {
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EXPECT_TRUE(cast<pointer_wrappers::Derived>(MD) == &D);
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EXPECT_TRUE(cast<pointer_wrappers::Derived>(CD) == &D);
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}
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TEST(CastingTest, smart_cast_or_null) {
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EXPECT_TRUE(cast_or_null<pointer_wrappers::Derived>(MN) == nullptr);
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EXPECT_TRUE(cast_or_null<pointer_wrappers::Derived>(CN) == nullptr);
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EXPECT_TRUE(cast_or_null<pointer_wrappers::Derived>(MD) == &D);
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EXPECT_TRUE(cast_or_null<pointer_wrappers::Derived>(CD) == &D);
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}
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TEST(CastingTest, smart_dyn_cast) {
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EXPECT_TRUE(dyn_cast<pointer_wrappers::Derived>(MB) == nullptr);
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EXPECT_TRUE(dyn_cast<pointer_wrappers::Derived>(CB) == nullptr);
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EXPECT_TRUE(dyn_cast<pointer_wrappers::Derived>(MD) == &D);
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EXPECT_TRUE(dyn_cast<pointer_wrappers::Derived>(CD) == &D);
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}
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TEST(CastingTest, smart_dyn_cast_or_null) {
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EXPECT_TRUE(dyn_cast_or_null<pointer_wrappers::Derived>(MN) == nullptr);
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EXPECT_TRUE(dyn_cast_or_null<pointer_wrappers::Derived>(CN) == nullptr);
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EXPECT_TRUE(dyn_cast_or_null<pointer_wrappers::Derived>(MB) == nullptr);
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EXPECT_TRUE(dyn_cast_or_null<pointer_wrappers::Derived>(CB) == nullptr);
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EXPECT_TRUE(dyn_cast_or_null<pointer_wrappers::Derived>(MD) == &D);
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EXPECT_TRUE(dyn_cast_or_null<pointer_wrappers::Derived>(CD) == &D);
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}
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} // end namespace pointer_wrappers
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} // end namespace
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