llvm/unittests/IR/DataLayoutTest.cpp

   1 //===- ConstantRangeTest.cpp - ConstantRange tests ------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "llvm/IR/DataLayout.h"
  10 #include "llvm/IR/GlobalVariable.h"
  11 #include "llvm/IR/LLVMContext.h"
  12 #include "llvm/IR/Module.h"
  13 #include "llvm/IR/Type.h"
  14 #include "llvm/Testing/Support/Error.h"
  15 #include "gtest/gtest.h"
  16
  17 using namespace llvm;
  18
  19 namespace {
  20
  21 TEST(DataLayoutTest, FunctionPtrAlign) {
  22   EXPECT_EQ(MaybeAlign(0), DataLayout("").getFunctionPtrAlign());
  23   EXPECT_EQ(MaybeAlign(1), DataLayout("Fi8").getFunctionPtrAlign());
  24   EXPECT_EQ(MaybeAlign(2), DataLayout("Fi16").getFunctionPtrAlign());
  25   EXPECT_EQ(MaybeAlign(4), DataLayout("Fi32").getFunctionPtrAlign());
  26   EXPECT_EQ(MaybeAlign(8), DataLayout("Fi64").getFunctionPtrAlign());
  27   EXPECT_EQ(MaybeAlign(1), DataLayout("Fn8").getFunctionPtrAlign());
  28   EXPECT_EQ(MaybeAlign(2), DataLayout("Fn16").getFunctionPtrAlign());
  29   EXPECT_EQ(MaybeAlign(4), DataLayout("Fn32").getFunctionPtrAlign());
  30   EXPECT_EQ(MaybeAlign(8), DataLayout("Fn64").getFunctionPtrAlign());
  31   EXPECT_EQ(DataLayout::FunctionPtrAlignType::Independent, \
  32       DataLayout("").getFunctionPtrAlignType());
  33   EXPECT_EQ(DataLayout::FunctionPtrAlignType::Independent, \
  34       DataLayout("Fi8").getFunctionPtrAlignType());
  35   EXPECT_EQ(DataLayout::FunctionPtrAlignType::MultipleOfFunctionAlign, \
  36       DataLayout("Fn8").getFunctionPtrAlignType());
  37   EXPECT_EQ(DataLayout("Fi8"), DataLayout("Fi8"));
  38   EXPECT_NE(DataLayout("Fi8"), DataLayout("Fi16"));
  39   EXPECT_NE(DataLayout("Fi8"), DataLayout("Fn8"));
  40
  41   DataLayout a(""), b("Fi8"), c("Fn8");
  42   EXPECT_NE(a, b);
  43   EXPECT_NE(a, c);
  44   EXPECT_NE(b, c);
  45
  46   a = b;
  47   EXPECT_EQ(a, b);
  48   a = c;
  49   EXPECT_EQ(a, c);
  50 }
  51
  52 TEST(DataLayoutTest, ValueOrABITypeAlignment) {
  53   const DataLayout DL("Fi8");
  54   LLVMContext Context;
  55   Type *const FourByteAlignType = Type::getInt32Ty(Context);
  56   EXPECT_EQ(Align(16),
  57             DL.getValueOrABITypeAlignment(MaybeAlign(16), FourByteAlignType));
  58   EXPECT_EQ(Align(4),
  59             DL.getValueOrABITypeAlignment(MaybeAlign(), FourByteAlignType));
  60 }
  61
  62 TEST(DataLayoutTest, GlobalsAddressSpace) {
  63   // When not explicitly defined the globals address space should be zero:
  64   EXPECT_EQ(DataLayout("").getDefaultGlobalsAddressSpace(), 0u);
  65   EXPECT_EQ(DataLayout("P1-A2").getDefaultGlobalsAddressSpace(), 0u);
  66   EXPECT_EQ(DataLayout("G2").getDefaultGlobalsAddressSpace(), 2u);
  67   // Check that creating a GlobalVariable without an explicit address space
  68   // in a module with a default globals address space respects that default:
  69   LLVMContext Context;
  70   std::unique_ptr<Module> M(new Module("MyModule", Context));
  71   // Default is globals in address space zero:
  72   auto *Int32 = Type::getInt32Ty(Context);
  73   auto *DefaultGlobal1 = new GlobalVariable(
  74       *M, Int32, false, GlobalValue::ExternalLinkage, nullptr);
  75   EXPECT_EQ(DefaultGlobal1->getAddressSpace(), 0u);
  76   auto *ExplicitGlobal1 = new GlobalVariable(
  77       *M, Int32, false, GlobalValue::ExternalLinkage, nullptr, "", nullptr,
  78       GlobalValue::NotThreadLocal, 123);
  79   EXPECT_EQ(ExplicitGlobal1->getAddressSpace(), 123u);
  80
  81   // When using a datalayout with the global address space set to 200, global
  82   // variables should default to 200
  83   M->setDataLayout("G200");
  84   auto *DefaultGlobal2 = new GlobalVariable(
  85       *M, Int32, false, GlobalValue::ExternalLinkage, nullptr);
  86   EXPECT_EQ(DefaultGlobal2->getAddressSpace(), 200u);
  87   auto *ExplicitGlobal2 = new GlobalVariable(
  88       *M, Int32, false, GlobalValue::ExternalLinkage, nullptr, "", nullptr,
  89       GlobalValue::NotThreadLocal, 123);
  90   EXPECT_EQ(ExplicitGlobal2->getAddressSpace(), 123u);
  91 }
  92
  93 TEST(DataLayoutTest, VectorAlign) {
  94   Expected<DataLayout> DL = DataLayout::parse("v64:64");
  95   EXPECT_THAT_EXPECTED(DL, Succeeded());
  96
  97   LLVMContext Context;
  98   Type *const FloatTy = Type::getFloatTy(Context);
  99   Type *const V8F32Ty = FixedVectorType::get(FloatTy, 8);
 100
 101   // The alignment for a vector type larger than any specified vector type uses
 102   // the natural alignment as a fallback.
 103   EXPECT_EQ(Align(4 * 8), DL->getABITypeAlign(V8F32Ty));
 104   EXPECT_EQ(Align(4 * 8), DL->getPrefTypeAlign(V8F32Ty));
 105 }
 106
 107 } // anonymous namespace