unittests/Support/Casting.cpp

   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 {
  23   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> {
  40   static inline bool doit(const bar &Val) {
  41     dbgs() << "Classof: " << &Val << "\n";
  42     return true;
  43   }
  44 };
  45
  46 foo *bar::baz() {
  47     return cast<foo>(this);
  48 }
  49
  50 foo *bar::caz() {
  51     return cast_or_null<foo>(this);
  52 }
  53
  54 foo *bar::daz() {
  55     return dyn_cast<foo>(this);
  56 }
  57
  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
  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
  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
 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
 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
 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
 154 bar *llvm::fub() { return 0; }