llvm/unittests/Object/ELFTypesTest.cpp

   1 //===----------------------- ELFTypesTest.cpp -----------------------------===//
   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 #include "llvm/Object/ELFTypes.h"
   9 #include "llvm/Testing/Support/Error.h"
  10 #include "gtest/gtest.h"
  11 #include <iostream>
  12
  13 using namespace llvm;
  14 using namespace llvm::object;
  15
  16 template <typename ELFT> using Elf_Note = typename ELFT::Note;
  17
  18 template <class ELFT> struct NoteTestData {
  19   std::vector<uint8_t> Data;
  20
  21   const Elf_Note_Impl<ELFT> getElfNote(StringRef Name, uint32_t Type,
  22                                        ArrayRef<uint8_t> Desc) {
  23     constexpr uint64_t Align = 4;
  24     Data.resize(alignTo(sizeof(Elf_Nhdr_Impl<ELFT>) + Name.size(), Align) +
  25                     alignTo(Desc.size(), Align),
  26                 0);
  27
  28     Elf_Nhdr_Impl<ELFT> *Nhdr =
  29         reinterpret_cast<Elf_Nhdr_Impl<ELFT> *>(Data.data());
  30     Nhdr->n_namesz = (Name == "") ? 0 : Name.size() + 1;
  31     Nhdr->n_descsz = Desc.size();
  32     Nhdr->n_type = Type;
  33
  34     auto NameOffset = Data.begin() + sizeof(*Nhdr);
  35     std::copy(Name.begin(), Name.end(), NameOffset);
  36
  37     auto DescOffset =
  38         Data.begin() + alignTo(sizeof(*Nhdr) + Nhdr->n_namesz, Align);
  39     std::copy(Desc.begin(), Desc.end(), DescOffset);
  40
  41     return Elf_Note_Impl<ELFT>(*Nhdr);
  42   }
  43 };
  44
  45 TEST(ELFTypesTest, NoteTest) {
  46   static const uint8_t Random[] = {1, 2, 3, 4, 5, 6, 7, 8, 9};
  47   ArrayRef<uint8_t> RandomData = ArrayRef(Random);
  48   NoteTestData<ELF64LE> TestData;
  49
  50   auto Note1 = TestData.getElfNote(StringRef("AMD"), ELF::NT_AMDGPU_METADATA,
  51                                    RandomData);
  52   EXPECT_EQ(Note1.getName(), "AMD");
  53   EXPECT_EQ(Note1.getType(), ELF::NT_AMDGPU_METADATA);
  54   EXPECT_EQ(Note1.getDesc(4), RandomData);
  55   EXPECT_EQ(Note1.getDescAsStringRef(4),
  56             StringRef(reinterpret_cast<const char *>(Random), sizeof(Random)));
  57
  58   auto Note2 = TestData.getElfNote("", ELF::NT_AMDGPU_METADATA, RandomData);
  59   EXPECT_EQ(Note2.getName(), "");
  60
  61   auto Note3 =
  62       TestData.getElfNote("AMD", ELF::NT_AMDGPU_METADATA, ArrayRef<uint8_t>());
  63   EXPECT_EQ(Note3.getDescAsStringRef(4), StringRef(""));
  64 }
  65
  66 TEST(ELFTypesTest, BBEntryMetadataEncodingTest) {
  67   const std::array<BBAddrMap::BBEntry::Metadata, 7> Decoded = {
  68       {{false, false, false, false, false},
  69        {true, false, false, false, false},
  70        {false, true, false, false, false},
  71        {false, false, true, false, false},
  72        {false, false, false, true, false},
  73        {false, false, false, false, true},
  74        {true, true, true, true, true}}};
  75   const std::array<uint32_t, 7> Encoded = {{0, 1, 2, 4, 8, 16, 31}};
  76   for (size_t i = 0; i < Decoded.size(); ++i)
  77     EXPECT_EQ(Decoded[i].encode(), Encoded[i]);
  78   for (size_t i = 0; i < Encoded.size(); ++i) {
  79     Expected<BBAddrMap::BBEntry::Metadata> MetadataOrError =
  80         BBAddrMap::BBEntry::Metadata::decode(Encoded[i]);
  81     ASSERT_THAT_EXPECTED(MetadataOrError, Succeeded());
  82     EXPECT_EQ(*MetadataOrError, Decoded[i]);
  83   }
  84 }
  85
  86 TEST(ELFTypesTest, BBEntryMetadataInvalidEncodingTest) {
  87   const std::array<std::string, 2> Errors = {
  88       "invalid encoding for BBEntry::Metadata: 0xffff",
  89       "invalid encoding for BBEntry::Metadata: 0x100001"};
  90   const std::array<uint32_t, 2> Values = {{0xFFFF, 0x100001}};
  91   for (size_t i = 0; i < Values.size(); ++i) {
  92     EXPECT_THAT_ERROR(
  93         BBAddrMap::BBEntry::Metadata::decode(Values[i]).takeError(),
  94         FailedWithMessage(Errors[i]));
  95   }
  96 }
  97
  98 static_assert(
  99     std::is_same_v<decltype(PGOAnalysisMap::PGOBBEntry::SuccessorEntry::ID),
 100                    decltype(BBAddrMap::BBEntry::ID)>,
 101     "PGOAnalysisMap should use the same type for basic block ID as BBAddrMap");
 102
 103 TEST(ELFTypesTest, BBAddrMapFeaturesEncodingTest) {
 104   const std::array<BBAddrMap::Features, 9> Decoded = {
 105       {{false, false, false, false, false},
 106        {true, false, false, false, false},
 107        {false, true, false, false, false},
 108        {false, false, true, false, false},
 109        {false, false, false, true, false},
 110        {true, true, false, false, false},
 111        {false, true, true, false, false},
 112        {false, true, true, true, false},
 113        {true, true, true, true, false}}};
 114   const std::array<uint8_t, 9> Encoded = {
 115       {0b0000, 0b0001, 0b0010, 0b0100, 0b1000, 0b0011, 0b0110, 0b1110, 0b1111}};
 116   for (const auto &[Feat, EncodedVal] : llvm::zip(Decoded, Encoded))
 117     EXPECT_EQ(Feat.encode(), EncodedVal);
 118   for (const auto &[Feat, EncodedVal] : llvm::zip(Decoded, Encoded)) {
 119     Expected<BBAddrMap::Features> FeatEnableOrError =
 120         BBAddrMap::Features::decode(EncodedVal);
 121     ASSERT_THAT_EXPECTED(FeatEnableOrError, Succeeded());
 122     EXPECT_EQ(*FeatEnableOrError, Feat);
 123   }
 124 }
 125
 126 TEST(ELFTypesTest, BBAddrMapFeaturesInvalidEncodingTest) {
 127   const std::array<std::string, 2> Errors = {
 128       "invalid encoding for BBAddrMap::Features: 0x20",
 129       "invalid encoding for BBAddrMap::Features: 0xf0"};
 130   const std::array<uint8_t, 2> Values = {{0b10'0000, 0b1111'0000}};
 131   for (const auto &[Val, Error] : llvm::zip(Values, Errors)) {
 132     EXPECT_THAT_ERROR(BBAddrMap::Features::decode(Val).takeError(),
 133                       FailedWithMessage(Error));
 134   }
 135 }