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annotate unittests/Support/Casting.cpp @ 147:c2174574ed3a

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LLVM 10
author Shinji KONO <kono@ie.u-ryukyu.ac.jp>
date Wed, 14 Aug 2019 16:55:33 +0900
parents 803732b1fca8
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 //===---------- llvm/unittest/Support/Casting.cpp - Casting tests ---------===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8
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9 #include "llvm/Support/Casting.h"
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10 #include "llvm/IR/User.h"
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11 #include "llvm/Support/Debug.h"
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12 #include "llvm/Support/raw_ostream.h"
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13 #include "gtest/gtest.h"
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14 #include <cstdlib>
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15
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16 namespace llvm {
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17 // Used to test illegal cast. If a cast doesn't match any of the "real" ones,
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18 // it will match this one.
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19 struct IllegalCast;
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20 template <typename T> IllegalCast *cast(...) { return nullptr; }
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21
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22 // set up two example classes
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23 // with conversion facility
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24 //
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25 struct bar {
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26 bar() {}
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27 struct foo *baz();
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28 struct foo *caz();
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29 struct foo *daz();
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30 struct foo *naz();
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31 private:
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32 bar(const bar &);
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33 };
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34 struct foo {
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35 void ext() const;
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36 /* static bool classof(const bar *X) {
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37 cerr << "Classof: " << X << "\n";
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38 return true;
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39 }*/
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40 };
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41
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42 struct base {
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43 virtual ~base() {}
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44 };
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45
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46 struct derived : public base {
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47 static bool classof(const base *B) { return true; }
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48 };
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49
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50 template <> struct isa_impl<foo, bar> {
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51 static inline bool doit(const bar &Val) {
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52 dbgs() << "Classof: " << &Val << "\n";
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53 return true;
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54 }
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55 };
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56
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57 template <typename T> struct isa_impl<foo, T> {
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58 static inline bool doit(const T &Val) { return false; }
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59 };
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60
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61 foo *bar::baz() {
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62 return cast<foo>(this);
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63 }
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64
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65 foo *bar::caz() {
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66 return cast_or_null<foo>(this);
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67 }
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68
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69 foo *bar::daz() {
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70 return dyn_cast<foo>(this);
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71 }
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72
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73 foo *bar::naz() {
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74 return dyn_cast_or_null<foo>(this);
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75 }
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78 bar *fub();
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79
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80 template <> struct simplify_type<foo> {
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81 typedef int SimpleType;
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82 static SimpleType getSimplifiedValue(foo &Val) { return 0; }
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83 };
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84
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85 } // End llvm namespace
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86
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87 using namespace llvm;
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88
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89
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90 // Test the peculiar behavior of Use in simplify_type.
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91 static_assert(std::is_same<simplify_type<Use>::SimpleType, Value *>::value,
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92 "Use doesn't simplify correctly!");
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93 static_assert(std::is_same<simplify_type<Use *>::SimpleType, Value *>::value,
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94 "Use doesn't simplify correctly!");
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95
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96 // Test that a regular class behaves as expected.
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97 static_assert(std::is_same<simplify_type<foo>::SimpleType, int>::value,
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98 "Unexpected simplify_type result!");
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99 static_assert(std::is_same<simplify_type<foo *>::SimpleType, foo *>::value,
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100 "Unexpected simplify_type result!");
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101
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102 namespace {
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103
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104 const foo *null_foo = nullptr;
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105
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106 bar B;
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107 extern bar &B1;
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108 bar &B1 = B;
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109 extern const bar *B2;
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110 // test various configurations of const
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111 const bar &B3 = B1;
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112 const bar *const B4 = B2;
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113
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114 TEST(CastingTest, isa) {
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115 EXPECT_TRUE(isa<foo>(B1));
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116 EXPECT_TRUE(isa<foo>(B2));
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117 EXPECT_TRUE(isa<foo>(B3));
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118 EXPECT_TRUE(isa<foo>(B4));
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119 }
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120
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121 TEST(CastingTest, isa_and_nonnull) {
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122 EXPECT_TRUE(isa_and_nonnull<foo>(B2));
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123 EXPECT_TRUE(isa_and_nonnull<foo>(B4));
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124 EXPECT_FALSE(isa_and_nonnull<foo>(fub()));
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125 }
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126
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127 TEST(CastingTest, cast) {
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128 foo &F1 = cast<foo>(B1);
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129 EXPECT_NE(&F1, null_foo);
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130 const foo *F3 = cast<foo>(B2);
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131 EXPECT_NE(F3, null_foo);
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132 const foo *F4 = cast<foo>(B2);
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133 EXPECT_NE(F4, null_foo);
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134 const foo &F5 = cast<foo>(B3);
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135 EXPECT_NE(&F5, null_foo);
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136 const foo *F6 = cast<foo>(B4);
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137 EXPECT_NE(F6, null_foo);
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138 // Can't pass null pointer to cast<>.
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139 // foo *F7 = cast<foo>(fub());
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140 // EXPECT_EQ(F7, null_foo);
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141 foo *F8 = B1.baz();
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142 EXPECT_NE(F8, null_foo);
121
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143
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144 std::unique_ptr<const bar> BP(B2);
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145 auto FP = cast<foo>(std::move(BP));
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146 static_assert(std::is_same<std::unique_ptr<const foo>, decltype(FP)>::value,
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147 "Incorrect deduced return type!");
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148 EXPECT_NE(FP.get(), null_foo);
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149 FP.release();
0
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150 }
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151
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152 TEST(CastingTest, cast_or_null) {
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153 const foo *F11 = cast_or_null<foo>(B2);
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154 EXPECT_NE(F11, null_foo);
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155 const foo *F12 = cast_or_null<foo>(B2);
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156 EXPECT_NE(F12, null_foo);
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157 const foo *F13 = cast_or_null<foo>(B4);
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158 EXPECT_NE(F13, null_foo);
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159 const foo *F14 = cast_or_null<foo>(fub()); // Shouldn't print.
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160 EXPECT_EQ(F14, null_foo);
95c75e76d11b LLVM 3.4
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161 foo *F15 = B1.caz();
95c75e76d11b LLVM 3.4
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162 EXPECT_NE(F15, null_foo);
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163
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164 std::unique_ptr<const bar> BP(fub());
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165 auto FP = cast_or_null<foo>(std::move(BP));
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166 EXPECT_EQ(FP.get(), null_foo);
0
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167 }
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168
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169 TEST(CastingTest, dyn_cast) {
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170 const foo *F1 = dyn_cast<foo>(B2);
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171 EXPECT_NE(F1, null_foo);
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172 const foo *F2 = dyn_cast<foo>(B2);
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173 EXPECT_NE(F2, null_foo);
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174 const foo *F3 = dyn_cast<foo>(B4);
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175 EXPECT_NE(F3, null_foo);
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176 // Can't pass null pointer to dyn_cast<>.
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177 // foo *F4 = dyn_cast<foo>(fub());
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178 // EXPECT_EQ(F4, null_foo);
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179 foo *F5 = B1.daz();
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180 EXPECT_NE(F5, null_foo);
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181 }
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182
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183 TEST(CastingTest, dyn_cast_or_null) {
95c75e76d11b LLVM 3.4
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184 const foo *F1 = dyn_cast_or_null<foo>(B2);
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185 EXPECT_NE(F1, null_foo);
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186 const foo *F2 = dyn_cast_or_null<foo>(B2);
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187 EXPECT_NE(F2, null_foo);
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188 const foo *F3 = dyn_cast_or_null<foo>(B4);
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189 EXPECT_NE(F3, null_foo);
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190 foo *F4 = dyn_cast_or_null<foo>(fub());
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191 EXPECT_EQ(F4, null_foo);
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192 foo *F5 = B1.naz();
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193 EXPECT_NE(F5, null_foo);
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194 }
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195
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196 std::unique_ptr<derived> newd() { return llvm::make_unique<derived>(); }
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197 std::unique_ptr<base> newb() { return llvm::make_unique<derived>(); }
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198
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199 TEST(CastingTest, unique_dyn_cast) {
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200 derived *OrigD = nullptr;
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201 auto D = llvm::make_unique<derived>();
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202 OrigD = D.get();
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203
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204 // Converting from D to itself is valid, it should return a new unique_ptr
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205 // and the old one should become nullptr.
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206 auto NewD = unique_dyn_cast<derived>(D);
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207 ASSERT_EQ(OrigD, NewD.get());
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208 ASSERT_EQ(nullptr, D);
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209
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210 // Converting from D to B is valid, B should have a value and D should be
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211 // nullptr.
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212 auto B = unique_dyn_cast<base>(NewD);
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213 ASSERT_EQ(OrigD, B.get());
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214 ASSERT_EQ(nullptr, NewD);
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215
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216 // Converting from B to itself is valid, it should return a new unique_ptr
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217 // and the old one should become nullptr.
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218 auto NewB = unique_dyn_cast<base>(B);
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219 ASSERT_EQ(OrigD, NewB.get());
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220 ASSERT_EQ(nullptr, B);
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221
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222 // Converting from B to D is valid, D should have a value and B should be
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223 // nullptr;
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224 D = unique_dyn_cast<derived>(NewB);
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225 ASSERT_EQ(OrigD, D.get());
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226 ASSERT_EQ(nullptr, NewB);
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227
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228 // Converting between unrelated types should fail. The original value should
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229 // remain unchanged and it should return nullptr.
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230 auto F = unique_dyn_cast<foo>(D);
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231 ASSERT_EQ(nullptr, F);
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232 ASSERT_EQ(OrigD, D.get());
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233
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234 // All of the above should also hold for temporaries.
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235 auto D2 = unique_dyn_cast<derived>(newd());
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236 EXPECT_NE(nullptr, D2);
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237
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238 auto B2 = unique_dyn_cast<derived>(newb());
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239 EXPECT_NE(nullptr, B2);
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240
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241 auto B3 = unique_dyn_cast<base>(newb());
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242 EXPECT_NE(nullptr, B3);
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243
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244 auto F2 = unique_dyn_cast<foo>(newb());
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245 EXPECT_EQ(nullptr, F2);
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246 }
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247
0
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248 // These lines are errors...
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249 //foo *F20 = cast<foo>(B2); // Yields const foo*
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250 //foo &F21 = cast<foo>(B3); // Yields const foo&
95c75e76d11b LLVM 3.4
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251 //foo *F22 = cast<foo>(B4); // Yields const foo*
95c75e76d11b LLVM 3.4
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252 //foo &F23 = cast_or_null<foo>(B1);
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253 //const foo &F24 = cast_or_null<foo>(B3);
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diff changeset
254
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diff changeset
255 const bar *B2 = &B;
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256 } // anonymous namespace
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257
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diff changeset
258 bar *llvm::fub() { return nullptr; }
0
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diff changeset
259
95c75e76d11b LLVM 3.4
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diff changeset
260 namespace {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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diff changeset
261 namespace inferred_upcasting {
95c75e76d11b LLVM 3.4
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parents:
diff changeset
262 // This test case verifies correct behavior of inferred upcasts when the
95c75e76d11b LLVM 3.4
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diff changeset
263 // types are statically known to be OK to upcast. This is the case when,
95c75e76d11b LLVM 3.4
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diff changeset
264 // for example, Derived inherits from Base, and we do `isa<Base>(Derived)`.
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diff changeset
265
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diff changeset
266 // Note: This test will actually fail to compile without inferred
95c75e76d11b LLVM 3.4
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diff changeset
267 // upcasting.
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268
95c75e76d11b LLVM 3.4
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diff changeset
269 class Base {
95c75e76d11b LLVM 3.4
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270 public:
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271 // No classof. We are testing that the upcast is inferred.
95c75e76d11b LLVM 3.4
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diff changeset
272 Base() {}
95c75e76d11b LLVM 3.4
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diff changeset
273 };
95c75e76d11b LLVM 3.4
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diff changeset
274
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275 class Derived : public Base {
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276 public:
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277 Derived() {}
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diff changeset
278 };
95c75e76d11b LLVM 3.4
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diff changeset
279
95c75e76d11b LLVM 3.4
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280 // Even with no explicit classof() in Base, we should still be able to cast
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diff changeset
281 // Derived to its base class.
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diff changeset
282 TEST(CastingTest, UpcastIsInferred) {
95c75e76d11b LLVM 3.4
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diff changeset
283 Derived D;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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diff changeset
284 EXPECT_TRUE(isa<Base>(D));
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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diff changeset
285 Base *BP = dyn_cast<Base>(&D);
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diff changeset
286 EXPECT_TRUE(BP != nullptr);
0
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diff changeset
287 }
95c75e76d11b LLVM 3.4
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parents:
diff changeset
288
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parents:
diff changeset
289
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290 // This test verifies that the inferred upcast takes precedence over an
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291 // explicitly written one. This is important because it verifies that the
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292 // dynamic check gets optimized away.
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293 class UseInferredUpcast {
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294 public:
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295 int Dummy;
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296 static bool classof(const UseInferredUpcast *) {
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297 return false;
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298 }
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299 };
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300
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301 TEST(CastingTest, InferredUpcastTakesPrecedence) {
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302 UseInferredUpcast UIU;
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303 // Since the explicit classof() returns false, this will fail if the
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304 // explicit one is used.
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305 EXPECT_TRUE(isa<UseInferredUpcast>(&UIU));
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306 }
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307
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308 } // end namespace inferred_upcasting
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309 } // end anonymous namespace
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310 // Test that we reject casts of temporaries (and so the illegal cast gets used).
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311 namespace TemporaryCast {
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312 struct pod {};
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313 IllegalCast *testIllegalCast() { return cast<foo>(pod()); }
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314 }
83
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315
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316 namespace {
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317 namespace pointer_wrappers {
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318
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319 struct Base {
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320 bool IsDerived;
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321 Base(bool IsDerived = false) : IsDerived(IsDerived) {}
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322 };
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323
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324 struct Derived : Base {
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325 Derived() : Base(true) {}
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326 static bool classof(const Base *B) { return B->IsDerived; }
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327 };
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328
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329 class PTy {
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330 Base *B;
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331 public:
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332 PTy(Base *B) : B(B) {}
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333 explicit operator bool() const { return get(); }
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334 Base *get() const { return B; }
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335 };
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336
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337 } // end namespace pointer_wrappers
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338 } // end namespace
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339
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340 namespace llvm {
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341
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342 template <> struct simplify_type<pointer_wrappers::PTy> {
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343 typedef pointer_wrappers::Base *SimpleType;
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344 static SimpleType getSimplifiedValue(pointer_wrappers::PTy &P) {
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345 return P.get();
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346 }
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347 };
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348 template <> struct simplify_type<const pointer_wrappers::PTy> {
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349 typedef pointer_wrappers::Base *SimpleType;
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350 static SimpleType getSimplifiedValue(const pointer_wrappers::PTy &P) {
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351 return P.get();
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352 }
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353 };
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354
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355 } // end namespace llvm
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356
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357 namespace {
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358 namespace pointer_wrappers {
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359
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360 // Some objects.
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361 pointer_wrappers::Base B;
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362 pointer_wrappers::Derived D;
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363
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364 // Mutable "smart" pointers.
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365 pointer_wrappers::PTy MN(nullptr);
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366 pointer_wrappers::PTy MB(&B);
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367 pointer_wrappers::PTy MD(&D);
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368
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369 // Const "smart" pointers.
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370 const pointer_wrappers::PTy CN(nullptr);
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371 const pointer_wrappers::PTy CB(&B);
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372 const pointer_wrappers::PTy CD(&D);
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373
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374 TEST(CastingTest, smart_isa) {
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375 EXPECT_TRUE(!isa<pointer_wrappers::Derived>(MB));
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376 EXPECT_TRUE(!isa<pointer_wrappers::Derived>(CB));
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377 EXPECT_TRUE(isa<pointer_wrappers::Derived>(MD));
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378 EXPECT_TRUE(isa<pointer_wrappers::Derived>(CD));
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379 }
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380
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381 TEST(CastingTest, smart_cast) {
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382 EXPECT_TRUE(cast<pointer_wrappers::Derived>(MD) == &D);
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383 EXPECT_TRUE(cast<pointer_wrappers::Derived>(CD) == &D);
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384 }
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385
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386 TEST(CastingTest, smart_cast_or_null) {
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387 EXPECT_TRUE(cast_or_null<pointer_wrappers::Derived>(MN) == nullptr);
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388 EXPECT_TRUE(cast_or_null<pointer_wrappers::Derived>(CN) == nullptr);
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389 EXPECT_TRUE(cast_or_null<pointer_wrappers::Derived>(MD) == &D);
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390 EXPECT_TRUE(cast_or_null<pointer_wrappers::Derived>(CD) == &D);
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391 }
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392
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393 TEST(CastingTest, smart_dyn_cast) {
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394 EXPECT_TRUE(dyn_cast<pointer_wrappers::Derived>(MB) == nullptr);
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395 EXPECT_TRUE(dyn_cast<pointer_wrappers::Derived>(CB) == nullptr);
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396 EXPECT_TRUE(dyn_cast<pointer_wrappers::Derived>(MD) == &D);
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397 EXPECT_TRUE(dyn_cast<pointer_wrappers::Derived>(CD) == &D);
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398 }
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diff changeset
399
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400 TEST(CastingTest, smart_dyn_cast_or_null) {
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401 EXPECT_TRUE(dyn_cast_or_null<pointer_wrappers::Derived>(MN) == nullptr);
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402 EXPECT_TRUE(dyn_cast_or_null<pointer_wrappers::Derived>(CN) == nullptr);
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403 EXPECT_TRUE(dyn_cast_or_null<pointer_wrappers::Derived>(MB) == nullptr);
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diff changeset
404 EXPECT_TRUE(dyn_cast_or_null<pointer_wrappers::Derived>(CB) == nullptr);
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diff changeset
405 EXPECT_TRUE(dyn_cast_or_null<pointer_wrappers::Derived>(MD) == &D);
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406 EXPECT_TRUE(dyn_cast_or_null<pointer_wrappers::Derived>(CD) == &D);
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407 }
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diff changeset
408
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409 } // end namespace pointer_wrappers
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410 } // end namespace