unittests/SymbolFile/DWARF/DWARFASTParserClangTests.cpp

//===-- DWARFASTParserClangTests.cpp --------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#include "Plugins/SymbolFile/DWARF/DWARFASTParserClang.h"
#include "Plugins/SymbolFile/DWARF/DWARFCompileUnit.h"
#include "Plugins/SymbolFile/DWARF/DWARFDIE.h"
#include "TestingSupport/Symbol/YAMLModuleTester.h"
#include "gmock/gmock.h"
#include "gtest/gtest.h"

using namespace lldb;
using namespace lldb_private;

namespace {
class DWARFASTParserClangTests : public testing::Test {};

class DWARFASTParserClangStub : public DWARFASTParserClang {
public:
  using DWARFASTParserClang::DWARFASTParserClang;
  using DWARFASTParserClang::LinkDeclContextToDIE;

  std::vector<const clang::DeclContext *> GetDeclContextToDIEMapKeys() {
    std::vector<const clang::DeclContext *> keys;
    for (const auto &it : m_decl_ctx_to_die)
      keys.push_back(it.first);
    return keys;
  }
};
} // namespace

// If your implementation needs to dereference the dummy pointers we are
// defining here, causing this test to fail, feel free to delete it.
TEST_F(DWARFASTParserClangTests,
       EnsureAllDIEsInDeclContextHaveBeenParsedParsesOnlyMatchingEntries) {

  /// Auxiliary debug info.
  const char *yamldata = R"(
--- !ELF
FileHeader:
  Class:   ELFCLASS64
  Data:    ELFDATA2LSB
  Type:    ET_EXEC
  Machine: EM_386
DWARF:
  debug_abbrev:
    - Table:
        - Code:            0x00000001
          Tag:             DW_TAG_compile_unit
          Children:        DW_CHILDREN_yes
          Attributes:
            - Attribute:       DW_AT_language
              Form:            DW_FORM_data2
        - Code:            0x00000002
          Tag:             DW_TAG_base_type
          Children:        DW_CHILDREN_no
          Attributes:
            - Attribute:       DW_AT_encoding
              Form:            DW_FORM_data1
            - Attribute:       DW_AT_byte_size
              Form:            DW_FORM_data1
  debug_info:
    - Version:         4
      AddrSize:        8
      Entries:
        - AbbrCode:        0x00000001
          Values:
            - Value:           0x000000000000000C
        - AbbrCode:        0x00000002
          Values:
            - Value:           0x0000000000000007 # DW_ATE_unsigned
            - Value:           0x0000000000000004
        - AbbrCode:        0x00000002
          Values:
            - Value:           0x0000000000000007 # DW_ATE_unsigned
            - Value:           0x0000000000000008
        - AbbrCode:        0x00000002
          Values:
            - Value:           0x0000000000000005 # DW_ATE_signed
            - Value:           0x0000000000000008
        - AbbrCode:        0x00000002
          Values:
            - Value:           0x0000000000000008 # DW_ATE_unsigned_char
            - Value:           0x0000000000000001
        - AbbrCode:        0x00000000
)";

  YAMLModuleTester t(yamldata);
  ASSERT_TRUE((bool)t.GetDwarfUnit());

  TypeSystemClang ast_ctx("dummy ASTContext", HostInfoBase::GetTargetTriple());
  DWARFASTParserClangStub ast_parser(ast_ctx);

  DWARFUnit *unit = t.GetDwarfUnit();
  const DWARFDebugInfoEntry *die_first = unit->DIE().GetDIE();
  const DWARFDebugInfoEntry *die_child0 = die_first->GetFirstChild();
  const DWARFDebugInfoEntry *die_child1 = die_child0->GetSibling();
  const DWARFDebugInfoEntry *die_child2 = die_child1->GetSibling();
  const DWARFDebugInfoEntry *die_child3 = die_child2->GetSibling();
  std::vector<DWARFDIE> dies = {
      DWARFDIE(unit, die_child0), DWARFDIE(unit, die_child1),
      DWARFDIE(unit, die_child2), DWARFDIE(unit, die_child3)};
  std::vector<clang::DeclContext *> decl_ctxs = {
      (clang::DeclContext *)1LL, (clang::DeclContext *)2LL,
      (clang::DeclContext *)2LL, (clang::DeclContext *)3LL};
  for (int i = 0; i < 4; ++i)
    ast_parser.LinkDeclContextToDIE(decl_ctxs[i], dies[i]);
  ast_parser.EnsureAllDIEsInDeclContextHaveBeenParsed(
      CompilerDeclContext(nullptr, decl_ctxs[1]));

  EXPECT_THAT(ast_parser.GetDeclContextToDIEMapKeys(),
              testing::UnorderedElementsAre(decl_ctxs[0], decl_ctxs[3]));
}