1 //===---------- llvm/unittest/Support/Casting.cpp - Casting tests ---------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9
10 #include "llvm/Support/Casting.h"
11 #include "llvm/Support/Debug.h"
12 #include "llvm/Support/raw_ostream.h"
13
14 #include "gtest/gtest.h"
15 #include <cstdlib>
16
17 namespace llvm {
18
19 // set up two example classes
20 // with conversion facility
21 //
22 struct bar {
barllvm::bar23 bar() {}
24 struct foo *baz();
25 struct foo *caz();
26 struct foo *daz();
27 struct foo *naz();
28 private:
29 bar(const bar &);
30 };
31 struct foo {
32 void ext() const;
33 /* static bool classof(const bar *X) {
34 cerr << "Classof: " << X << "\n";
35 return true;
36 }*/
37 };
38
39 template <> struct isa_impl<foo, bar> {
doitllvm::isa_impl40 static inline bool doit(const bar &Val) {
41 dbgs() << "Classof: " << &Val << "\n";
42 return true;
43 }
44 };
45
baz()46 foo *bar::baz() {
47 return cast<foo>(this);
48 }
49
caz()50 foo *bar::caz() {
51 return cast_or_null<foo>(this);
52 }
53
daz()54 foo *bar::daz() {
55 return dyn_cast<foo>(this);
56 }
57
naz()58 foo *bar::naz() {
59 return dyn_cast_or_null<foo>(this);
60 }
61
62
63 bar *fub();
64 } // End llvm namespace
65
66 using namespace llvm;
67
68 namespace {
69
70 const foo *null_foo = NULL;
71
72 extern bar &B1;
73 extern const bar *B2;
74 // test various configurations of const
75 const bar &B3 = B1;
76 const bar *const B4 = B2;
77
TEST(CastingTest,isa)78 TEST(CastingTest, isa) {
79 EXPECT_TRUE(isa<foo>(B1));
80 EXPECT_TRUE(isa<foo>(B2));
81 EXPECT_TRUE(isa<foo>(B3));
82 EXPECT_TRUE(isa<foo>(B4));
83 }
84
TEST(CastingTest,cast)85 TEST(CastingTest, cast) {
86 foo &F1 = cast<foo>(B1);
87 EXPECT_NE(&F1, null_foo);
88 const foo *F3 = cast<foo>(B2);
89 EXPECT_NE(F3, null_foo);
90 const foo *F4 = cast<foo>(B2);
91 EXPECT_NE(F4, null_foo);
92 const foo &F5 = cast<foo>(B3);
93 EXPECT_NE(&F5, null_foo);
94 const foo *F6 = cast<foo>(B4);
95 EXPECT_NE(F6, null_foo);
96 foo *F7 = cast<foo>(fub());
97 EXPECT_EQ(F7, null_foo);
98 foo *F8 = B1.baz();
99 EXPECT_NE(F8, null_foo);
100 }
101
TEST(CastingTest,cast_or_null)102 TEST(CastingTest, cast_or_null) {
103 const foo *F11 = cast_or_null<foo>(B2);
104 EXPECT_NE(F11, null_foo);
105 const foo *F12 = cast_or_null<foo>(B2);
106 EXPECT_NE(F12, null_foo);
107 const foo *F13 = cast_or_null<foo>(B4);
108 EXPECT_NE(F13, null_foo);
109 const foo *F14 = cast_or_null<foo>(fub()); // Shouldn't print.
110 EXPECT_EQ(F14, null_foo);
111 foo *F15 = B1.caz();
112 EXPECT_NE(F15, null_foo);
113 }
114
TEST(CastingTest,dyn_cast)115 TEST(CastingTest, dyn_cast) {
116 const foo *F1 = dyn_cast<foo>(B2);
117 EXPECT_NE(F1, null_foo);
118 const foo *F2 = dyn_cast<foo>(B2);
119 EXPECT_NE(F2, null_foo);
120 const foo *F3 = dyn_cast<foo>(B4);
121 EXPECT_NE(F3, null_foo);
122 // foo *F4 = dyn_cast<foo>(fub()); // not permittible
123 // EXPECT_EQ(F4, null_foo);
124 foo *F5 = B1.daz();
125 EXPECT_NE(F5, null_foo);
126 }
127
TEST(CastingTest,dyn_cast_or_null)128 TEST(CastingTest, dyn_cast_or_null) {
129 const foo *F1 = dyn_cast_or_null<foo>(B2);
130 EXPECT_NE(F1, null_foo);
131 const foo *F2 = dyn_cast_or_null<foo>(B2);
132 EXPECT_NE(F2, null_foo);
133 const foo *F3 = dyn_cast_or_null<foo>(B4);
134 EXPECT_NE(F3, null_foo);
135 foo *F4 = dyn_cast_or_null<foo>(fub());
136 EXPECT_EQ(F4, null_foo);
137 foo *F5 = B1.naz();
138 EXPECT_NE(F5, null_foo);
139 }
140
141 // These lines are errors...
142 //foo *F20 = cast<foo>(B2); // Yields const foo*
143 //foo &F21 = cast<foo>(B3); // Yields const foo&
144 //foo *F22 = cast<foo>(B4); // Yields const foo*
145 //foo &F23 = cast_or_null<foo>(B1);
146 //const foo &F24 = cast_or_null<foo>(B3);
147
148
149 bar B;
150 bar &B1 = B;
151 const bar *B2 = &B;
152 } // anonymous namespace
153
fub()154 bar *llvm::fub() { return 0; }
155