unittests/MC/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/MC/StringTableBuilder.h"
  10 #include "llvm/ADT/SmallString.h"
  11 #include "llvm/Support/Endian.h"
  12 #include "gtest/gtest.h"
  13 #include <string>
  14
  15 using namespace llvm;
  16
  17 namespace {
  18
  19 TEST(StringTableBuilderTest, BasicELF) {
  20   StringTableBuilder B(StringTableBuilder::ELF);
  21
  22   B.add("foo");
  23   B.add("bar");
  24   B.add("foobar");
  25
  26   B.finalize();
  27
  28   std::string Expected;
  29   Expected += '\x00';
  30   Expected += "foobar";
  31   Expected += '\x00';
  32   Expected += "foo";
  33   Expected += '\x00';
  34
  35   SmallString<64> Data;
  36   raw_svector_ostream OS(Data);
  37   B.write(OS);
  38
  39   EXPECT_EQ(Expected, Data);
  40   EXPECT_EQ(1U, B.getOffset("foobar"));
  41   EXPECT_EQ(4U, B.getOffset("bar"));
  42   EXPECT_EQ(8U, B.getOffset("foo"));
  43 }
  44
  45 TEST(StringTableBuilderTest, BasicWinCOFF) {
  46   StringTableBuilder B(StringTableBuilder::WinCOFF);
  47
  48   // Strings must be 9 chars or longer to go in the table.
  49   B.add("hippopotamus");
  50   B.add("pygmy hippopotamus");
  51   B.add("river horse");
  52
  53   B.finalize();
  54
  55   // size_field + "pygmy hippopotamus\0" + "river horse\0"
  56   uint32_t ExpectedSize = 4 + 19 + 12;
  57   EXPECT_EQ(ExpectedSize, B.getSize());
  58
  59   std::string Expected;
  60
  61   ExpectedSize =
  62       support::endian::byte_swap<uint32_t, support::little>(ExpectedSize);
  63   Expected.append((const char*)&ExpectedSize, 4);
  64   Expected += "pygmy hippopotamus";
  65   Expected += '\x00';
  66   Expected += "river horse";
  67   Expected += '\x00';
  68
  69   SmallString<64> Data;
  70   raw_svector_ostream OS(Data);
  71   B.write(OS);
  72
  73   EXPECT_EQ(Expected, Data);
  74   EXPECT_EQ(4U, B.getOffset("pygmy hippopotamus"));
  75   EXPECT_EQ(10U, B.getOffset("hippopotamus"));
  76   EXPECT_EQ(23U, B.getOffset("river horse"));
  77 }
  78
  79 TEST(StringTableBuilderTest, ELFInOrder) {
  80   StringTableBuilder B(StringTableBuilder::ELF);
  81   EXPECT_EQ(1U, B.add("foo"));
  82   EXPECT_EQ(5U, B.add("bar"));
  83   EXPECT_EQ(9U, B.add("foobar"));
  84
  85   B.finalizeInOrder();
  86
  87   std::string Expected;
  88   Expected += '\x00';
  89   Expected += "foo";
  90   Expected += '\x00';
  91   Expected += "bar";
  92   Expected += '\x00';
  93   Expected += "foobar";
  94   Expected += '\x00';
  95
  96   SmallString<64> Data;
  97   raw_svector_ostream OS(Data);
  98   B.write(OS);
  99
 100   EXPECT_EQ(Expected, Data);
 101   EXPECT_EQ(1U, B.getOffset("foo"));
 102   EXPECT_EQ(5U, B.getOffset("bar"));
 103   EXPECT_EQ(9U, B.getOffset("foobar"));
 104 }
 105
 106 }