llvm/unittests/DebugInfo/PDB/StringTableBuilderTest.cpp

   1 //===- StringTableBuilderTest.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
   9 #include "llvm/DebugInfo/PDB/Native/PDBStringTable.h"
  10 #include "llvm/DebugInfo/PDB/Native/PDBStringTableBuilder.h"
  11 #include "llvm/Support/BinaryByteStream.h"
  12 #include "llvm/Support/BinaryStreamReader.h"
  13 #include "llvm/Support/BinaryStreamWriter.h"
  14 #include "llvm/Testing/Support/Error.h"
  15
  16 #include "gtest/gtest.h"
  17
  18 using namespace llvm;
  19 using namespace llvm::pdb;
  20 using namespace llvm::support;
  21
  22 TEST(StringTableBuilderTest, Simple) {
  23   // Create /names table contents.
  24   PDBStringTableBuilder Builder;
  25
  26   // This test case is carefully constructed to ensure that at least one
  27   // string gets bucketed into slot 0, *and* to ensure that at least one
  28   // has a hash collision at the end of the bucket list so it has to
  29   // wrap around.
  30   uint32_t FooID = Builder.insert("foo");
  31   uint32_t BarID = Builder.insert("bar");
  32   uint32_t BazID = Builder.insert("baz");
  33   uint32_t BuzzID = Builder.insert("buzz");
  34   uint32_t BazzID = Builder.insert("bazz");
  35   uint32_t BarrID = Builder.insert("barr");
  36
  37   // Re-inserting the same item should return the same id.
  38   EXPECT_EQ(FooID, Builder.insert("foo"));
  39   EXPECT_EQ(BarID, Builder.insert("bar"));
  40   EXPECT_EQ(BazID, Builder.insert("baz"));
  41   EXPECT_EQ(BuzzID, Builder.insert("buzz"));
  42   EXPECT_EQ(BazzID, Builder.insert("bazz"));
  43   EXPECT_EQ(BarrID, Builder.insert("barr"));
  44
  45   // Each ID should be distinct.
  46   std::set<uint32_t> Distinct{FooID, BarID, BazID, BuzzID, BazzID, BarrID};
  47   EXPECT_EQ(6U, Distinct.size());
  48
  49   std::vector<uint8_t> Buffer(Builder.calculateSerializedSize());
  50   MutableBinaryByteStream OutStream(Buffer, little);
  51   BinaryStreamWriter Writer(OutStream);
  52   EXPECT_THAT_ERROR(Builder.commit(Writer), Succeeded());
  53
  54   // Reads the contents back.
  55   BinaryByteStream InStream(Buffer, little);
  56   BinaryStreamReader Reader(InStream);
  57   PDBStringTable Table;
  58   EXPECT_THAT_ERROR(Table.reload(Reader), Succeeded());
  59
  60   EXPECT_EQ(6U, Table.getNameCount());
  61   EXPECT_EQ(1U, Table.getHashVersion());
  62
  63   EXPECT_THAT_EXPECTED(Table.getStringForID(FooID), HasValue("foo"));
  64   EXPECT_THAT_EXPECTED(Table.getStringForID(BarID), HasValue("bar"));
  65   EXPECT_THAT_EXPECTED(Table.getStringForID(BazID), HasValue("baz"));
  66   EXPECT_THAT_EXPECTED(Table.getStringForID(BuzzID), HasValue("buzz"));
  67   EXPECT_THAT_EXPECTED(Table.getStringForID(BazzID), HasValue("bazz"));
  68   EXPECT_THAT_EXPECTED(Table.getStringForID(BarrID), HasValue("barr"));
  69
  70   EXPECT_THAT_EXPECTED(Table.getIDForString("foo"), HasValue(FooID));
  71   EXPECT_THAT_EXPECTED(Table.getIDForString("bar"), HasValue(BarID));
  72   EXPECT_THAT_EXPECTED(Table.getIDForString("baz"), HasValue(BazID));
  73   EXPECT_THAT_EXPECTED(Table.getIDForString("buzz"), HasValue(BuzzID));
  74   EXPECT_THAT_EXPECTED(Table.getIDForString("bazz"), HasValue(BazzID));
  75   EXPECT_THAT_EXPECTED(Table.getIDForString("barr"), HasValue(BarrID));
  76 }
  77
  78 TEST(StringTableHashTraitsTest, Simple) {
  79   PDBStringTableBuilder Builder;
  80
  81   // Create more than 64kiB of dummy entries.
  82   for (int i = 0; i < 320; ++i) {
  83     std::string aaaaa = std::string(220, 'a') + std::to_string(i);
  84     Builder.insert(aaaaa);
  85   }
  86
  87   std::string S = "foo.natvis";
  88   uint32_t Pos = Builder.insert(S);
  89
  90   EXPECT_GT(Pos, 0xFFFFu);
  91
  92   StringTableHashTraits Traits(Builder);
  93   EXPECT_LE(Traits.hashLookupKey(S), 0xFFFFu);
  94 }