unittests/DebugInfo/DWARF/DWARFDieTest.cpp

//===- llvm/unittest/DebugInfo/DWARFDieTest.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 "llvm/BinaryFormat/Dwarf.h"
#include "llvm/DebugInfo/DWARF/DWARFContext.h"
#include "llvm/ObjectYAML/DWARFEmitter.h"
#include "llvm/Testing/Support/Error.h"
#include "gtest/gtest.h"

using namespace llvm;
using namespace llvm::dwarf;
using object::SectionedAddress;

namespace {

TEST(DWARFDie, getLocations) {
  const char *yamldata = R"(
    debug_abbrev:
      - Table:
          - Code:            0x00000001
            Tag:             DW_TAG_compile_unit
            Children:        DW_CHILDREN_no
            Attributes:
              - Attribute:       DW_AT_location
                Form:            DW_FORM_sec_offset
              - Attribute:       DW_AT_data_member_location
                Form:            DW_FORM_exprloc
              - Attribute:       DW_AT_vtable_elem_location
                Form:            DW_FORM_sec_offset
              - Attribute:       DW_AT_call_data_location
                Form:            DW_FORM_sec_offset
    debug_info:
      - Version:         5
        UnitType:        DW_UT_compile
        AddrSize:        4
        Entries:
          - AbbrCode:        0x00000001
            Values:
              - Value:           12
              - Value:           0x0000000000000001
                BlockData:       [ 0x47 ]
              - Value:           20
              - Value:           25
    debug_loclists:
      - AddressSize:      4
        OffsetEntryCount: 0
        Lists:
          - Entries:
              - Operator: DW_LLE_start_length
                Values:   [ 0x01, 0x02 ]
              - Operator: DW_LLE_end_of_list
          - Entries:
              - Operator: DW_LLE_startx_length
                Values:   [ 0x01, 0x02 ]
              - Operator: DW_LLE_end_of_list
          - Entries:
              - Operator: DW_LLE_start_length
                Values:   [ 0x01, 0x02 ]
              ## end_of_list intentionally missing.
  )";
  Expected<StringMap<std::unique_ptr<MemoryBuffer>>> Sections =
      DWARFYAML::emitDebugSections(StringRef(yamldata),
                                   /*IsLittleEndian=*/true,
                                   /*Is64BitAddrSize=*/false);
  ASSERT_THAT_EXPECTED(Sections, Succeeded());
  std::unique_ptr<DWARFContext> Ctx =
      DWARFContext::create(*Sections, 4, /*isLittleEndian=*/true);
  DWARFCompileUnit *CU = Ctx->getCompileUnitForOffset(0);
  ASSERT_NE(nullptr, CU);
  DWARFDie Die = CU->getUnitDIE();
  ASSERT_TRUE(Die.isValid());

  EXPECT_THAT_EXPECTED(Die.getLocations(DW_AT_location),
                       HasValue(testing::ElementsAre(DWARFLocationExpression{
                           DWARFAddressRange{1, 3}, {}})));

  EXPECT_THAT_EXPECTED(
      Die.getLocations(DW_AT_data_member_location),
      HasValue(testing::ElementsAre(DWARFLocationExpression{None, {0x47}})));

  EXPECT_THAT_EXPECTED(
      Die.getLocations(DW_AT_vtable_elem_location),
      Failed<ErrorInfoBase>(testing::Property(
          &ErrorInfoBase::message,
          "Unable to resolve indirect address 1 for: DW_LLE_startx_length")));

  EXPECT_THAT_EXPECTED(
      Die.getLocations(DW_AT_call_data_location),
      FailedWithMessage(
          "unexpected end of data at offset 0x20 while reading [0x20, 0x21)"));

  EXPECT_THAT_EXPECTED(
      Die.getLocations(DW_AT_call_data_value),
      Failed<ErrorInfoBase>(testing::Property(&ErrorInfoBase::message,
                                              "No DW_AT_call_data_value")));
}

} // end anonymous namespace