Casting.cpp revision 2a53577728948052b8508760406b6ba68e55fc82 
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
17namespace llvm {
18
19// set up two example classes
20// with conversion facility
21//
22struct bar {
23  bar() {}
24  struct foo *baz();
25  struct foo *caz();
26  struct foo *daz();
27  struct foo *naz();
28private:
29  bar(const bar &);
30};
31struct foo {
32  void ext() const;
33  /*  static bool classof(const bar *X) {
34    cerr << "Classof: " << X << "\n";
35    return true;
36    }*/
37};
38
39template <> struct isa_impl<foo, bar> {
40  static inline bool doit(const bar &Val) {
41    dbgs() << "Classof: " << &Val << "\n";
42    return true;
43  }
44};
45
46foo *bar::baz() {
47    return cast<foo>(this);
48}
49
50foo *bar::caz() {
51    return cast_or_null<foo>(this);
52}
53
54foo *bar::daz() {
55    return dyn_cast<foo>(this);
56}
57
58foo *bar::naz() {
59    return dyn_cast_or_null<foo>(this);
60}
61
62
63bar *fub();
64} // End llvm namespace
65
66using namespace llvm;
67
68namespace {
69
70const foo *null_foo = NULL;
71
72bar B;
73extern bar &B1;
74bar &B1 = B;
75extern const bar *B2;
76// test various configurations of const
77const bar &B3 = B1;
78const bar *const B4 = B2;
79
80TEST(CastingTest, isa) {
81  EXPECT_TRUE(isa<foo>(B1));
82  EXPECT_TRUE(isa<foo>(B2));
83  EXPECT_TRUE(isa<foo>(B3));
84  EXPECT_TRUE(isa<foo>(B4));
85}
86
87TEST(CastingTest, cast) {
88  foo &F1 = cast<foo>(B1);
89  EXPECT_NE(&F1, null_foo);
90  const foo *F3 = cast<foo>(B2);
91  EXPECT_NE(F3, null_foo);
92  const foo *F4 = cast<foo>(B2);
93  EXPECT_NE(F4, null_foo);
94  const foo &F5 = cast<foo>(B3);
95  EXPECT_NE(&F5, null_foo);
96  const foo *F6 = cast<foo>(B4);
97  EXPECT_NE(F6, null_foo);
98  foo *F7 = cast<foo>(fub());
99  EXPECT_EQ(F7, null_foo);
100  foo *F8 = B1.baz();
101  EXPECT_NE(F8, null_foo);
102}
103
104TEST(CastingTest, cast_or_null) {
105  const foo *F11 = cast_or_null<foo>(B2);
106  EXPECT_NE(F11, null_foo);
107  const foo *F12 = cast_or_null<foo>(B2);
108  EXPECT_NE(F12, null_foo);
109  const foo *F13 = cast_or_null<foo>(B4);
110  EXPECT_NE(F13, null_foo);
111  const foo *F14 = cast_or_null<foo>(fub());  // Shouldn't print.
112  EXPECT_EQ(F14, null_foo);
113  foo *F15 = B1.caz();
114  EXPECT_NE(F15, null_foo);
115}
116
117TEST(CastingTest, dyn_cast) {
118  const foo *F1 = dyn_cast<foo>(B2);
119  EXPECT_NE(F1, null_foo);
120  const foo *F2 = dyn_cast<foo>(B2);
121  EXPECT_NE(F2, null_foo);
122  const foo *F3 = dyn_cast<foo>(B4);
123  EXPECT_NE(F3, null_foo);
124  // foo *F4 = dyn_cast<foo>(fub()); // not permittible
125  // EXPECT_EQ(F4, null_foo);
126  foo *F5 = B1.daz();
127  EXPECT_NE(F5, null_foo);
128}
129
130TEST(CastingTest, dyn_cast_or_null) {
131  const foo *F1 = dyn_cast_or_null<foo>(B2);
132  EXPECT_NE(F1, null_foo);
133  const foo *F2 = dyn_cast_or_null<foo>(B2);
134  EXPECT_NE(F2, null_foo);
135  const foo *F3 = dyn_cast_or_null<foo>(B4);
136  EXPECT_NE(F3, null_foo);
137  foo *F4 = dyn_cast_or_null<foo>(fub());
138  EXPECT_EQ(F4, null_foo);
139  foo *F5 = B1.naz();
140  EXPECT_NE(F5, null_foo);
141}
142
143// These lines are errors...
144//foo *F20 = cast<foo>(B2);  // Yields const foo*
145//foo &F21 = cast<foo>(B3);  // Yields const foo&
146//foo *F22 = cast<foo>(B4);  // Yields const foo*
147//foo &F23 = cast_or_null<foo>(B1);
148//const foo &F24 = cast_or_null<foo>(B3);
149
150const bar *B2 = &B;
151}  // anonymous namespace
152
153bar *llvm::fub() { return 0; }
154