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      1 //===- llvm/unittest/IR/ConstantsTest.cpp - Constants 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/IR/Constants.h"
     11 #include "llvm/IR/DerivedTypes.h"
     12 #include "llvm/IR/InstrTypes.h"
     13 #include "llvm/IR/Instruction.h"
     14 #include "llvm/IR/LLVMContext.h"
     15 #include "llvm/IR/Module.h"
     16 #include "gtest/gtest.h"
     17 
     18 namespace llvm {
     19 namespace {
     20 
     21 TEST(ConstantsTest, Integer_i1) {
     22   IntegerType* Int1 = IntegerType::get(getGlobalContext(), 1);
     23   Constant* One = ConstantInt::get(Int1, 1, true);
     24   Constant* Zero = ConstantInt::get(Int1, 0);
     25   Constant* NegOne = ConstantInt::get(Int1, static_cast<uint64_t>(-1), true);
     26   EXPECT_EQ(NegOne, ConstantInt::getSigned(Int1, -1));
     27   Constant* Undef = UndefValue::get(Int1);
     28 
     29   // Input:  @b = constant i1 add(i1 1 , i1 1)
     30   // Output: @b = constant i1 false
     31   EXPECT_EQ(Zero, ConstantExpr::getAdd(One, One));
     32 
     33   // @c = constant i1 add(i1 -1, i1 1)
     34   // @c = constant i1 false
     35   EXPECT_EQ(Zero, ConstantExpr::getAdd(NegOne, One));
     36 
     37   // @d = constant i1 add(i1 -1, i1 -1)
     38   // @d = constant i1 false
     39   EXPECT_EQ(Zero, ConstantExpr::getAdd(NegOne, NegOne));
     40 
     41   // @e = constant i1 sub(i1 -1, i1 1)
     42   // @e = constant i1 false
     43   EXPECT_EQ(Zero, ConstantExpr::getSub(NegOne, One));
     44 
     45   // @f = constant i1 sub(i1 1 , i1 -1)
     46   // @f = constant i1 false
     47   EXPECT_EQ(Zero, ConstantExpr::getSub(One, NegOne));
     48 
     49   // @g = constant i1 sub(i1 1 , i1 1)
     50   // @g = constant i1 false
     51   EXPECT_EQ(Zero, ConstantExpr::getSub(One, One));
     52 
     53   // @h = constant i1 shl(i1 1 , i1 1)  ; undefined
     54   // @h = constant i1 undef
     55   EXPECT_EQ(Undef, ConstantExpr::getShl(One, One));
     56 
     57   // @i = constant i1 shl(i1 1 , i1 0)
     58   // @i = constant i1 true
     59   EXPECT_EQ(One, ConstantExpr::getShl(One, Zero));
     60 
     61   // @j = constant i1 lshr(i1 1, i1 1)  ; undefined
     62   // @j = constant i1 undef
     63   EXPECT_EQ(Undef, ConstantExpr::getLShr(One, One));
     64 
     65   // @m = constant i1 ashr(i1 1, i1 1)  ; undefined
     66   // @m = constant i1 undef
     67   EXPECT_EQ(Undef, ConstantExpr::getAShr(One, One));
     68 
     69   // @n = constant i1 mul(i1 -1, i1 1)
     70   // @n = constant i1 true
     71   EXPECT_EQ(One, ConstantExpr::getMul(NegOne, One));
     72 
     73   // @o = constant i1 sdiv(i1 -1, i1 1) ; overflow
     74   // @o = constant i1 true
     75   EXPECT_EQ(One, ConstantExpr::getSDiv(NegOne, One));
     76 
     77   // @p = constant i1 sdiv(i1 1 , i1 -1); overflow
     78   // @p = constant i1 true
     79   EXPECT_EQ(One, ConstantExpr::getSDiv(One, NegOne));
     80 
     81   // @q = constant i1 udiv(i1 -1, i1 1)
     82   // @q = constant i1 true
     83   EXPECT_EQ(One, ConstantExpr::getUDiv(NegOne, One));
     84 
     85   // @r = constant i1 udiv(i1 1, i1 -1)
     86   // @r = constant i1 true
     87   EXPECT_EQ(One, ConstantExpr::getUDiv(One, NegOne));
     88 
     89   // @s = constant i1 srem(i1 -1, i1 1) ; overflow
     90   // @s = constant i1 false
     91   EXPECT_EQ(Zero, ConstantExpr::getSRem(NegOne, One));
     92 
     93   // @t = constant i1 urem(i1 -1, i1 1)
     94   // @t = constant i1 false
     95   EXPECT_EQ(Zero, ConstantExpr::getURem(NegOne, One));
     96 
     97   // @u = constant i1 srem(i1  1, i1 -1) ; overflow
     98   // @u = constant i1 false
     99   EXPECT_EQ(Zero, ConstantExpr::getSRem(One, NegOne));
    100 }
    101 
    102 TEST(ConstantsTest, IntSigns) {
    103   IntegerType* Int8Ty = Type::getInt8Ty(getGlobalContext());
    104   EXPECT_EQ(100, ConstantInt::get(Int8Ty, 100, false)->getSExtValue());
    105   EXPECT_EQ(100, ConstantInt::get(Int8Ty, 100, true)->getSExtValue());
    106   EXPECT_EQ(100, ConstantInt::getSigned(Int8Ty, 100)->getSExtValue());
    107   EXPECT_EQ(-50, ConstantInt::get(Int8Ty, 206)->getSExtValue());
    108   EXPECT_EQ(-50, ConstantInt::getSigned(Int8Ty, -50)->getSExtValue());
    109   EXPECT_EQ(206U, ConstantInt::getSigned(Int8Ty, -50)->getZExtValue());
    110 
    111   // Overflow is handled by truncation.
    112   EXPECT_EQ(0x3b, ConstantInt::get(Int8Ty, 0x13b)->getSExtValue());
    113 }
    114 
    115 TEST(ConstantsTest, FP128Test) {
    116   Type *FP128Ty = Type::getFP128Ty(getGlobalContext());
    117 
    118   IntegerType *Int128Ty = Type::getIntNTy(getGlobalContext(), 128);
    119   Constant *Zero128 = Constant::getNullValue(Int128Ty);
    120   Constant *X = ConstantExpr::getUIToFP(Zero128, FP128Ty);
    121   EXPECT_TRUE(isa<ConstantFP>(X));
    122 }
    123 
    124 TEST(ConstantsTest, PointerCast) {
    125   LLVMContext &C(getGlobalContext());
    126   Type *Int8PtrTy = Type::getInt8PtrTy(C);
    127   Type *Int32PtrTy = Type::getInt32PtrTy(C);
    128   Type *Int64Ty = Type::getInt64Ty(C);
    129   VectorType *Int8PtrVecTy = VectorType::get(Int8PtrTy, 4);
    130   VectorType *Int32PtrVecTy = VectorType::get(Int32PtrTy, 4);
    131   VectorType *Int64VecTy = VectorType::get(Int64Ty, 4);
    132 
    133   // ptrtoint i8* to i64
    134   EXPECT_EQ(Constant::getNullValue(Int64Ty),
    135             ConstantExpr::getPointerCast(
    136               Constant::getNullValue(Int8PtrTy), Int64Ty));
    137 
    138   // bitcast i8* to i32*
    139   EXPECT_EQ(Constant::getNullValue(Int32PtrTy),
    140             ConstantExpr::getPointerCast(
    141               Constant::getNullValue(Int8PtrTy), Int32PtrTy));
    142 
    143   // ptrtoint <4 x i8*> to <4 x i64>
    144   EXPECT_EQ(Constant::getNullValue(Int64VecTy),
    145             ConstantExpr::getPointerCast(
    146               Constant::getNullValue(Int8PtrVecTy), Int64VecTy));
    147 
    148   // bitcast <4 x i8*> to <4 x i32*>
    149   EXPECT_EQ(Constant::getNullValue(Int32PtrVecTy),
    150             ConstantExpr::getPointerCast(
    151               Constant::getNullValue(Int8PtrVecTy), Int32PtrVecTy));
    152 }
    153 
    154 #define CHECK(x, y) {                                         		\
    155     std::string __s;                                            	\
    156     raw_string_ostream __o(__s);                                	\
    157     Instruction *__I = cast<ConstantExpr>(x)->getAsInstruction();	\
    158     __I->print(__o);      						\
    159     delete __I; 							\
    160     __o.flush();                                                	\
    161     EXPECT_EQ(std::string("  <badref> = " y), __s);             	\
    162   }
    163 
    164 TEST(ConstantsTest, AsInstructionsTest) {
    165   std::unique_ptr<Module> M(new Module("MyModule", getGlobalContext()));
    166 
    167   Type *Int64Ty = Type::getInt64Ty(getGlobalContext());
    168   Type *Int32Ty = Type::getInt32Ty(getGlobalContext());
    169   Type *Int16Ty = Type::getInt16Ty(getGlobalContext());
    170   Type *Int1Ty = Type::getInt1Ty(getGlobalContext());
    171   Type *FloatTy = Type::getFloatTy(getGlobalContext());
    172   Type *DoubleTy = Type::getDoubleTy(getGlobalContext());
    173 
    174   Constant *Global = M->getOrInsertGlobal("dummy",
    175                                          PointerType::getUnqual(Int32Ty));
    176   Constant *Global2 = M->getOrInsertGlobal("dummy2",
    177                                          PointerType::getUnqual(Int32Ty));
    178 
    179   Constant *P0 = ConstantExpr::getPtrToInt(Global, Int32Ty);
    180   Constant *P1 = ConstantExpr::getUIToFP(P0, FloatTy);
    181   Constant *P2 = ConstantExpr::getUIToFP(P0, DoubleTy);
    182   Constant *P3 = ConstantExpr::getTrunc(P0, Int1Ty);
    183   Constant *P4 = ConstantExpr::getPtrToInt(Global2, Int32Ty);
    184   Constant *P5 = ConstantExpr::getUIToFP(P4, FloatTy);
    185   Constant *P6 = ConstantExpr::getBitCast(P4, VectorType::get(Int16Ty, 2));
    186 
    187   Constant *One = ConstantInt::get(Int32Ty, 1);
    188 
    189   #define P0STR "ptrtoint (i32** @dummy to i32)"
    190   #define P1STR "uitofp (i32 ptrtoint (i32** @dummy to i32) to float)"
    191   #define P2STR "uitofp (i32 ptrtoint (i32** @dummy to i32) to double)"
    192   #define P3STR "ptrtoint (i32** @dummy to i1)"
    193   #define P4STR "ptrtoint (i32** @dummy2 to i32)"
    194   #define P5STR "uitofp (i32 ptrtoint (i32** @dummy2 to i32) to float)"
    195   #define P6STR "bitcast (i32 ptrtoint (i32** @dummy2 to i32) to <2 x i16>)"
    196 
    197   CHECK(ConstantExpr::getNeg(P0), "sub i32 0, " P0STR);
    198   CHECK(ConstantExpr::getFNeg(P1), "fsub float -0.000000e+00, " P1STR);
    199   CHECK(ConstantExpr::getNot(P0), "xor i32 " P0STR ", -1");
    200   CHECK(ConstantExpr::getAdd(P0, P0), "add i32 " P0STR ", " P0STR);
    201   CHECK(ConstantExpr::getAdd(P0, P0, false, true), "add nsw i32 " P0STR ", "
    202         P0STR);
    203   CHECK(ConstantExpr::getAdd(P0, P0, true, true), "add nuw nsw i32 " P0STR ", "
    204         P0STR);
    205   CHECK(ConstantExpr::getFAdd(P1, P1), "fadd float " P1STR ", " P1STR);
    206   CHECK(ConstantExpr::getSub(P0, P0), "sub i32 " P0STR ", " P0STR);
    207   CHECK(ConstantExpr::getFSub(P1, P1), "fsub float " P1STR ", " P1STR);
    208   CHECK(ConstantExpr::getMul(P0, P0), "mul i32 " P0STR ", " P0STR);
    209   CHECK(ConstantExpr::getFMul(P1, P1), "fmul float " P1STR ", " P1STR);
    210   CHECK(ConstantExpr::getUDiv(P0, P0), "udiv i32 " P0STR ", " P0STR);
    211   CHECK(ConstantExpr::getSDiv(P0, P0), "sdiv i32 " P0STR ", " P0STR);
    212   CHECK(ConstantExpr::getFDiv(P1, P1), "fdiv float " P1STR ", " P1STR);
    213   CHECK(ConstantExpr::getURem(P0, P0), "urem i32 " P0STR ", " P0STR);
    214   CHECK(ConstantExpr::getSRem(P0, P0), "srem i32 " P0STR ", " P0STR);
    215   CHECK(ConstantExpr::getFRem(P1, P1), "frem float " P1STR ", " P1STR);
    216   CHECK(ConstantExpr::getAnd(P0, P0), "and i32 " P0STR ", " P0STR);
    217   CHECK(ConstantExpr::getOr(P0, P0), "or i32 " P0STR ", " P0STR);
    218   CHECK(ConstantExpr::getXor(P0, P0), "xor i32 " P0STR ", " P0STR);
    219   CHECK(ConstantExpr::getShl(P0, P0), "shl i32 " P0STR ", " P0STR);
    220   CHECK(ConstantExpr::getShl(P0, P0, true), "shl nuw i32 " P0STR ", " P0STR);
    221   CHECK(ConstantExpr::getShl(P0, P0, false, true), "shl nsw i32 " P0STR ", "
    222         P0STR);
    223   CHECK(ConstantExpr::getLShr(P0, P0, false), "lshr i32 " P0STR ", " P0STR);
    224   CHECK(ConstantExpr::getLShr(P0, P0, true), "lshr exact i32 " P0STR ", " P0STR);
    225   CHECK(ConstantExpr::getAShr(P0, P0, false), "ashr i32 " P0STR ", " P0STR);
    226   CHECK(ConstantExpr::getAShr(P0, P0, true), "ashr exact i32 " P0STR ", " P0STR);
    227 
    228   CHECK(ConstantExpr::getSExt(P0, Int64Ty), "sext i32 " P0STR " to i64");
    229   CHECK(ConstantExpr::getZExt(P0, Int64Ty), "zext i32 " P0STR " to i64");
    230   CHECK(ConstantExpr::getFPTrunc(P2, FloatTy), "fptrunc double " P2STR
    231         " to float");
    232   CHECK(ConstantExpr::getFPExtend(P1, DoubleTy), "fpext float " P1STR
    233         " to double");
    234 
    235   CHECK(ConstantExpr::getExactUDiv(P0, P0), "udiv exact i32 " P0STR ", " P0STR);
    236 
    237   CHECK(ConstantExpr::getSelect(P3, P0, P4), "select i1 " P3STR ", i32 " P0STR
    238         ", i32 " P4STR);
    239   CHECK(ConstantExpr::getICmp(CmpInst::ICMP_EQ, P0, P4), "icmp eq i32 " P0STR
    240         ", " P4STR);
    241   CHECK(ConstantExpr::getFCmp(CmpInst::FCMP_ULT, P1, P5), "fcmp ult float "
    242         P1STR ", " P5STR);
    243 
    244   std::vector<Constant*> V;
    245   V.push_back(One);
    246   // FIXME: getGetElementPtr() actually creates an inbounds ConstantGEP,
    247   //        not a normal one!
    248   //CHECK(ConstantExpr::getGetElementPtr(Global, V, false),
    249   //      "getelementptr i32** @dummy, i32 1");
    250   CHECK(ConstantExpr::getInBoundsGetElementPtr(Global, V),
    251         "getelementptr inbounds i32** @dummy, i32 1");
    252 
    253   CHECK(ConstantExpr::getExtractElement(P6, One), "extractelement <2 x i16> "
    254         P6STR ", i32 1");
    255 }
    256 
    257 #ifdef GTEST_HAS_DEATH_TEST
    258 #ifndef NDEBUG
    259 TEST(ConstantsTest, ReplaceWithConstantTest) {
    260   std::unique_ptr<Module> M(new Module("MyModule", getGlobalContext()));
    261 
    262   Type *Int32Ty = Type::getInt32Ty(getGlobalContext());
    263   Constant *One = ConstantInt::get(Int32Ty, 1);
    264 
    265   Constant *Global =
    266       M->getOrInsertGlobal("dummy", PointerType::getUnqual(Int32Ty));
    267   Constant *GEP = ConstantExpr::getGetElementPtr(Global, One);
    268   EXPECT_DEATH(Global->replaceAllUsesWith(GEP),
    269                "this->replaceAllUsesWith\\(expr\\(this\\)\\) is NOT valid!");
    270 }
    271 
    272 #endif
    273 #endif
    274 
    275 #undef CHECK
    276 
    277 }  // end anonymous namespace
    278 }  // end namespace llvm
    279