unittests/VMCore/InstructionsTest.cpp

   1 //===- llvm/unittest/VMCore/InstructionsTest.cpp - Instructions 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/Instructions.h"
  11 #include "llvm/BasicBlock.h"
  12 #include "llvm/DerivedTypes.h"
  13 #include "llvm/LLVMContext.h"
  14 #include "llvm/ADT/STLExtras.h"
  15 #include "gtest/gtest.h"
  16
  17 namespace llvm {
  18 namespace {
  19
  20 TEST(InstructionsTest, ReturnInst) {
  21   LLVMContext &C(getGlobalContext());
  22
  23   // test for PR6589
  24   const ReturnInst* r0 = ReturnInst::Create(C);
  25   EXPECT_EQ(r0->getNumOperands(), 0U);
  26   EXPECT_EQ(r0->op_begin(), r0->op_end());
  27
  28   const IntegerType* Int1 = IntegerType::get(C, 1);
  29   Constant* One = ConstantInt::get(Int1, 1, true);
  30   const ReturnInst* r1 = ReturnInst::Create(C, One);
  31   EXPECT_EQ(r1->getNumOperands(), 1U);
  32   User::const_op_iterator b(r1->op_begin());
  33   EXPECT_NE(b, r1->op_end());
  34   EXPECT_EQ(*b, One);
  35   EXPECT_EQ(r1->getOperand(0), One);
  36   ++b;
  37   EXPECT_EQ(b, r1->op_end());
  38
  39   // clean up
  40   delete r0;
  41   delete r1;
  42 }
  43
  44 TEST(InstructionsTest, BranchInst) {
  45   LLVMContext &C(getGlobalContext());
  46
  47   // Make a BasicBlocks
  48   BasicBlock* bb0 = BasicBlock::Create(C);
  49   BasicBlock* bb1 = BasicBlock::Create(C);
  50
  51   // Mandatory BranchInst
  52   const BranchInst* b0 = BranchInst::Create(bb0);
  53
  54   EXPECT_TRUE(b0->isUnconditional());
  55   EXPECT_FALSE(b0->isConditional());
  56   EXPECT_EQ(b0->getNumSuccessors(), 1U);
  57
  58   // check num operands
  59   EXPECT_EQ(b0->getNumOperands(), 1U);
  60
  61   EXPECT_NE(b0->op_begin(), b0->op_end());
  62   EXPECT_EQ(llvm::next(b0->op_begin()), b0->op_end());
  63
  64   EXPECT_EQ(llvm::next(b0->op_begin()), b0->op_end());
  65
  66   const IntegerType* Int1 = IntegerType::get(C, 1);
  67   Constant* One = ConstantInt::get(Int1, 1, true);
  68
  69   // Conditional BranchInst
  70   BranchInst* b1 = BranchInst::Create(bb0, bb1, One);
  71
  72   EXPECT_FALSE(b1->isUnconditional());
  73   EXPECT_TRUE(b1->isConditional());
  74   EXPECT_EQ(b1->getNumSuccessors(), 2U);
  75
  76   // check num operands
  77   EXPECT_EQ(b1->getNumOperands(), 3U);
  78
  79   User::const_op_iterator b(b1->op_begin());
  80
  81   // check COND
  82   EXPECT_NE(b, b1->op_end());
  83   EXPECT_EQ(*b, One);
  84   EXPECT_EQ(b1->getOperand(0), One);
  85   EXPECT_EQ(b1->getCondition(), One);
  86   ++b;
  87
  88   // check ELSE
  89   EXPECT_EQ(*b, bb1);
  90   EXPECT_EQ(b1->getOperand(1), bb1);
  91   EXPECT_EQ(b1->getSuccessor(1), bb1);
  92   ++b;
  93
  94   // check THEN
  95   EXPECT_EQ(*b, bb0);
  96   EXPECT_EQ(b1->getOperand(2), bb0);
  97   EXPECT_EQ(b1->getSuccessor(0), bb0);
  98   ++b;
  99
 100   EXPECT_EQ(b, b1->op_end());
 101
 102   // shrink it
 103   b1->setUnconditionalDest(bb1);
 104
 105   // check num operands
 106   EXPECT_EQ(b1->getNumOperands(), 1U);
 107
 108   User::const_op_iterator c(b1->op_begin());
 109   EXPECT_NE(c, b1->op_end());
 110
 111   // check THEN
 112   EXPECT_EQ(*c, bb1);
 113   EXPECT_EQ(b1->getOperand(0), bb1);
 114   EXPECT_EQ(b1->getSuccessor(0), bb1);
 115   ++c;
 116
 117   EXPECT_EQ(c, b1->op_end());
 118
 119   // clean up
 120   delete b0;
 121   delete b1;
 122
 123   delete bb0;
 124   delete bb1;
 125 }
 126
 127 }  // end anonymous namespace
 128 }  // end namespace llvm