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      1 //===- llvm/unittest/IR/UserTest.cpp - User unit 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/AsmParser/Parser.h"
     11 #include "llvm/IR/Function.h"
     12 #include "llvm/IR/Instructions.h"
     13 #include "llvm/IR/LLVMContext.h"
     14 #include "llvm/IR/Module.h"
     15 #include "llvm/IR/User.h"
     16 #include "llvm/Support/SourceMgr.h"
     17 #include "gtest/gtest.h"
     18 using namespace llvm;
     19 
     20 namespace {
     21 
     22 TEST(UserTest, ValueOpIteration) {
     23   LLVMContext C;
     24 
     25   const char *ModuleString = "define void @f(i32 %x, i32 %y) {\n"
     26                              "entry:\n"
     27                              "  switch i32 undef, label %s0\n"
     28                              "      [ i32 1, label %s1\n"
     29                              "        i32 2, label %s2\n"
     30                              "        i32 3, label %s3\n"
     31                              "        i32 4, label %s4\n"
     32                              "        i32 5, label %s5\n"
     33                              "        i32 6, label %s6\n"
     34                              "        i32 7, label %s7\n"
     35                              "        i32 8, label %s8\n"
     36                              "        i32 9, label %s9 ]\n"
     37                              "\n"
     38                              "s0:\n"
     39                              "  br label %exit\n"
     40                              "s1:\n"
     41                              "  br label %exit\n"
     42                              "s2:\n"
     43                              "  br label %exit\n"
     44                              "s3:\n"
     45                              "  br label %exit\n"
     46                              "s4:\n"
     47                              "  br label %exit\n"
     48                              "s5:\n"
     49                              "  br label %exit\n"
     50                              "s6:\n"
     51                              "  br label %exit\n"
     52                              "s7:\n"
     53                              "  br label %exit\n"
     54                              "s8:\n"
     55                              "  br label %exit\n"
     56                              "s9:\n"
     57                              "  br label %exit\n"
     58                              "\n"
     59                              "exit:\n"
     60                              "  %phi = phi i32 [ 0, %s0 ], [ 1, %s1 ],\n"
     61                              "                 [ 2, %s2 ], [ 3, %s3 ],\n"
     62                              "                 [ 4, %s4 ], [ 5, %s5 ],\n"
     63                              "                 [ 6, %s6 ], [ 7, %s7 ],\n"
     64                              "                 [ 8, %s8 ], [ 9, %s9 ]\n"
     65                              "  ret void\n"
     66                              "}\n";
     67   SMDiagnostic Err;
     68   std::unique_ptr<Module> M = parseAssemblyString(ModuleString, Err, C);
     69 
     70   Function *F = M->getFunction("f");
     71   BasicBlock &ExitBB = F->back();
     72   PHINode &P = cast<PHINode>(ExitBB.front());
     73   EXPECT_TRUE(P.value_op_begin() == P.value_op_begin());
     74   EXPECT_FALSE(P.value_op_begin() == P.value_op_end());
     75   EXPECT_TRUE(P.value_op_begin() != P.value_op_end());
     76   EXPECT_FALSE(P.value_op_end() != P.value_op_end());
     77   EXPECT_TRUE(P.value_op_begin() < P.value_op_end());
     78   EXPECT_FALSE(P.value_op_begin() < P.value_op_begin());
     79   EXPECT_TRUE(P.value_op_end() > P.value_op_begin());
     80   EXPECT_FALSE(P.value_op_begin() > P.value_op_begin());
     81   EXPECT_TRUE(P.value_op_begin() <= P.value_op_begin());
     82   EXPECT_FALSE(P.value_op_end() <= P.value_op_begin());
     83   EXPECT_TRUE(P.value_op_begin() >= P.value_op_begin());
     84   EXPECT_FALSE(P.value_op_begin() >= P.value_op_end());
     85   EXPECT_EQ(10, std::distance(P.value_op_begin(), P.value_op_end()));
     86 
     87   User::value_op_iterator I = P.value_op_begin();
     88   I += 3;
     89   EXPECT_EQ(std::next(P.value_op_begin(), 3), I);
     90   EXPECT_EQ(P.getOperand(3), *I);
     91   I++;
     92   EXPECT_EQ(P.getOperand(6), I[2]);
     93   EXPECT_EQ(P.value_op_end(), (I - 2) + 8);
     94 }
     95 
     96 TEST(UserTest, PersonalityUser) {
     97   LLVMContext Context;
     98   Module M("", Context);
     99   FunctionType *RetVoidTy = FunctionType::get(Type::getVoidTy(Context), false);
    100   Function *PersonalityF = Function::Create(
    101       RetVoidTy, GlobalValue::ExternalLinkage, "PersonalityFn", &M);
    102   Function *TestF =
    103       Function::Create(RetVoidTy, GlobalValue::ExternalLinkage, "TestFn", &M);
    104 
    105   // Set up the personality function
    106   TestF->setPersonalityFn(PersonalityF);
    107   auto PersonalityUsers = PersonalityF->user_begin();
    108 
    109   // One user and that user is the Test function
    110   EXPECT_EQ(*PersonalityUsers, TestF);
    111   EXPECT_EQ(++PersonalityUsers, PersonalityF->user_end());
    112 
    113   // Reset the personality function
    114   TestF->setPersonalityFn(nullptr);
    115 
    116   // No users should remain
    117   EXPECT_TRUE(TestF->user_empty());
    118 }
    119 
    120 } // end anonymous namespace
    121