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platform_system_core/libunwindstack/tests/DwarfEhFrameWithHdrTest.cpp
Christopher Ferris 7e21eba5b7 Switch case to suite to follow new gtest naming. 
Bug: 135528735

Test: All unit tests pass.
Change-Id: I1f3dc6fe381ec557b6b7bc5cb1c58d210efa63da
2019-06-20 16:18:57 -07:00

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/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdint.h>
#include <gmock/gmock.h>
#include <gtest/gtest.h>
#include <unwindstack/DwarfError.h>
#include "DwarfEhFrameWithHdr.h"
#include "DwarfEncoding.h"
#include "LogFake.h"
#include "MemoryFake.h"
namespace unwindstack {
template <typename TypeParam>
class TestDwarfEhFrameWithHdr : public DwarfEhFrameWithHdr<TypeParam> {
public:
TestDwarfEhFrameWithHdr(Memory* memory) : DwarfEhFrameWithHdr<TypeParam>(memory) {}
~TestDwarfEhFrameWithHdr() = default;
void TestSetTableEncoding(uint8_t encoding) { this->table_encoding_ = encoding; }
void TestSetEntriesOffset(uint64_t offset) { this->entries_offset_ = offset; }
void TestSetEntriesEnd(uint64_t end) { this->entries_end_ = end; }
void TestSetEntriesDataOffset(uint64_t offset) { this->entries_data_offset_ = offset; }
void TestSetCurEntriesOffset(uint64_t offset) { this->cur_entries_offset_ = offset; }
void TestSetTableEntrySize(size_t size) { this->table_entry_size_ = size; }
void TestSetFdeCount(uint64_t count) { this->fde_count_ = count; }
void TestSetFdeInfo(uint64_t index, const typename DwarfEhFrameWithHdr<TypeParam>::FdeInfo& info) {
this->fde_info_[index] = info;
}
uint8_t TestGetVersion() { return this->version_; }
uint8_t TestGetPtrEncoding() { return this->ptr_encoding_; }
uint64_t TestGetPtrOffset() { return this->ptr_offset_; }
uint8_t TestGetTableEncoding() { return this->table_encoding_; }
uint64_t TestGetTableEntrySize() { return this->table_entry_size_; }
uint64_t TestGetFdeCount() { return this->fde_count_; }
uint64_t TestGetEntriesOffset() { return this->entries_offset_; }
uint64_t TestGetEntriesEnd() { return this->entries_end_; }
uint64_t TestGetEntriesDataOffset() { return this->entries_data_offset_; }
uint64_t TestGetCurEntriesOffset() { return this->cur_entries_offset_; }
};
template <typename TypeParam>
class DwarfEhFrameWithHdrTest : public ::testing::Test {
protected:
void SetUp() override {
memory_.Clear();
eh_frame_ = new TestDwarfEhFrameWithHdr<TypeParam>(&memory_);
ResetLogs();
}
void TearDown() override { delete eh_frame_; }
MemoryFake memory_;
TestDwarfEhFrameWithHdr<TypeParam>* eh_frame_ = nullptr;
};
TYPED_TEST_SUITE_P(DwarfEhFrameWithHdrTest);
// NOTE: All test class variables need to be referenced as this->.
TYPED_TEST_P(DwarfEhFrameWithHdrTest, Init) {
this->memory_.SetMemory(
0x1000, std::vector<uint8_t>{0x1, DW_EH_PE_udata2, DW_EH_PE_udata4, DW_EH_PE_sdata4});
this->memory_.SetData16(0x1004, 0x500);
this->memory_.SetData32(0x1006, 126);
ASSERT_TRUE(this->eh_frame_->Init(0x1000, 0x100, 0));
EXPECT_EQ(1U, this->eh_frame_->TestGetVersion());
EXPECT_EQ(DW_EH_PE_udata2, this->eh_frame_->TestGetPtrEncoding());
EXPECT_EQ(DW_EH_PE_sdata4, this->eh_frame_->TestGetTableEncoding());
EXPECT_EQ(4U, this->eh_frame_->TestGetTableEntrySize());
EXPECT_EQ(126U, this->eh_frame_->TestGetFdeCount());
EXPECT_EQ(0x500U, this->eh_frame_->TestGetPtrOffset());
EXPECT_EQ(0x100aU, this->eh_frame_->TestGetEntriesOffset());
EXPECT_EQ(0x1100U, this->eh_frame_->TestGetEntriesEnd());
EXPECT_EQ(0x1000U, this->eh_frame_->TestGetEntriesDataOffset());
EXPECT_EQ(0x100aU, this->eh_frame_->TestGetCurEntriesOffset());
// Verify a zero table entry size fails to init.
this->memory_.SetData8(0x1003, 0x1);
ASSERT_FALSE(this->eh_frame_->Init(0x1000, 0x100, 0));
ASSERT_EQ(DWARF_ERROR_ILLEGAL_VALUE, this->eh_frame_->LastErrorCode());
// Reset the value back to the original.
this->memory_.SetData8(0x1003, DW_EH_PE_sdata4);
// Verify a zero fde count fails to init.
this->memory_.SetData32(0x1006, 0);
ASSERT_FALSE(this->eh_frame_->Init(0x1000, 0x100, 0));
ASSERT_EQ(DWARF_ERROR_NO_FDES, this->eh_frame_->LastErrorCode());
// Verify an unexpected version will cause a fail.
this->memory_.SetData32(0x1006, 126);
this->memory_.SetData8(0x1000, 0);
ASSERT_FALSE(this->eh_frame_->Init(0x1000, 0x100, 0));
ASSERT_EQ(DWARF_ERROR_UNSUPPORTED_VERSION, this->eh_frame_->LastErrorCode());
this->memory_.SetData8(0x1000, 2);
ASSERT_FALSE(this->eh_frame_->Init(0x1000, 0x100, 0));
ASSERT_EQ(DWARF_ERROR_UNSUPPORTED_VERSION, this->eh_frame_->LastErrorCode());
}
TYPED_TEST_P(DwarfEhFrameWithHdrTest, Init_non_zero_load_bias) {
this->memory_.SetMemory(0x1000, std::vector<uint8_t>{0x1, DW_EH_PE_udata2, DW_EH_PE_udata4,
DW_EH_PE_pcrel | DW_EH_PE_sdata4});
this->memory_.SetData16(0x1004, 0x500);
this->memory_.SetData32(0x1006, 1);
this->memory_.SetData32(0x100a, 0x2500);
this->memory_.SetData32(0x100e, 0x1400);
// CIE 32 information.
this->memory_.SetData32(0x1300, 0xfc);
this->memory_.SetData32(0x1304, 0);
this->memory_.SetMemory(0x1308, std::vector<uint8_t>{1, 'z', 'R', '\0', 0, 0, 0, 0, 0x1b});
// FDE 32 information.
this->memory_.SetData32(0x1400, 0xfc);
this->memory_.SetData32(0x1404, 0x104);
this->memory_.SetData32(0x1408, 0x10f8);
this->memory_.SetData32(0x140c, 0x200);
this->memory_.SetData16(0x1410, 0);
ASSERT_TRUE(this->eh_frame_->Init(0x1000, 0x100, 0x2000));
EXPECT_EQ(1U, this->eh_frame_->TestGetVersion());
EXPECT_EQ(DW_EH_PE_udata2, this->eh_frame_->TestGetPtrEncoding());
EXPECT_EQ(0x1b, this->eh_frame_->TestGetTableEncoding());
EXPECT_EQ(4U, this->eh_frame_->TestGetTableEntrySize());
EXPECT_EQ(1U, this->eh_frame_->TestGetFdeCount());
EXPECT_EQ(0x500U, this->eh_frame_->TestGetPtrOffset());
EXPECT_EQ(0x100aU, this->eh_frame_->TestGetEntriesOffset());
EXPECT_EQ(0x1100U, this->eh_frame_->TestGetEntriesEnd());
EXPECT_EQ(0x1000U, this->eh_frame_->TestGetEntriesDataOffset());
EXPECT_EQ(0x100aU, this->eh_frame_->TestGetCurEntriesOffset());
const DwarfFde* fde = this->eh_frame_->GetFdeFromPc(0x4600);
ASSERT_TRUE(fde != nullptr);
EXPECT_EQ(0x4500U, fde->pc_start);
EXPECT_EQ(0x4700U, fde->pc_end);
}
TYPED_TEST_P(DwarfEhFrameWithHdrTest, GetFdes) {
this->memory_.SetMemory(
0x1000, std::vector<uint8_t>{1, DW_EH_PE_udata2, DW_EH_PE_udata4, DW_EH_PE_sdata4});
this->memory_.SetData16(0x1004, 0x500);
this->memory_.SetData32(0x1006, 4);
// Header information.
this->memory_.SetData32(0x100a, 0x4600);
this->memory_.SetData32(0x100e, 0x1500);
this->memory_.SetData32(0x1012, 0x5500);
this->memory_.SetData32(0x1016, 0x1400);
this->memory_.SetData32(0x101a, 0x6800);
this->memory_.SetData32(0x101e, 0x1700);
this->memory_.SetData32(0x1022, 0x7700);
this->memory_.SetData32(0x1026, 0x1600);
// CIE 32 information.
this->memory_.SetData32(0x1300, 0xfc);
this->memory_.SetData32(0x1304, 0);
this->memory_.SetMemory(0x1308, std::vector<uint8_t>{1, '\0', 0, 0, 0});
// FDE 32 information.
// pc 0x5500 - 0x5700
this->memory_.SetData32(0x1400, 0xfc);
this->memory_.SetData32(0x1404, 0x104);
this->memory_.SetData32(0x1408, 0x40f8);
this->memory_.SetData32(0x140c, 0x200);
// pc 0x4600 - 0x4800
this->memory_.SetData32(0x1500, 0xfc);
this->memory_.SetData32(0x1504, 0x204);
this->memory_.SetData32(0x1508, 0x30f8);
this->memory_.SetData32(0x150c, 0x200);
// pc 0x7700 - 0x7900
this->memory_.SetData32(0x1600, 0xfc);
this->memory_.SetData32(0x1604, 0x304);
this->memory_.SetData32(0x1608, 0x60f8);
this->memory_.SetData32(0x160c, 0x200);
// pc 0x6800 - 0x6a00
this->memory_.SetData32(0x1700, 0xfc);
this->memory_.SetData32(0x1704, 0x404);
this->memory_.SetData32(0x1708, 0x50f8);
this->memory_.SetData32(0x170c, 0x200);
ASSERT_TRUE(this->eh_frame_->Init(0x1000, 0x100, 0));
std::vector<const DwarfFde*> fdes;
this->eh_frame_->GetFdes(&fdes);
ASSERT_EQ(4U, fdes.size());
EXPECT_EQ(0x4600U, fdes[0]->pc_start);
EXPECT_EQ(0x4800U, fdes[0]->pc_end);
EXPECT_EQ(0x5500U, fdes[1]->pc_start);
EXPECT_EQ(0x5700U, fdes[1]->pc_end);
EXPECT_EQ(0x6800U, fdes[2]->pc_start);
EXPECT_EQ(0x6a00U, fdes[2]->pc_end);
EXPECT_EQ(0x7700U, fdes[3]->pc_start);
EXPECT_EQ(0x7900U, fdes[3]->pc_end);
}
TYPED_TEST_P(DwarfEhFrameWithHdrTest, GetFdeInfoFromIndex_expect_cache_fail) {
this->eh_frame_->TestSetTableEntrySize(0x10);
this->eh_frame_->TestSetTableEncoding(DW_EH_PE_udata4);
this->eh_frame_->TestSetEntriesOffset(0x1000);
ASSERT_TRUE(this->eh_frame_->GetFdeInfoFromIndex(0) == nullptr);
ASSERT_EQ(DWARF_ERROR_MEMORY_INVALID, this->eh_frame_->LastErrorCode());
EXPECT_EQ(0x1000U, this->eh_frame_->LastErrorAddress());
ASSERT_TRUE(this->eh_frame_->GetFdeInfoFromIndex(0) == nullptr);
ASSERT_EQ(DWARF_ERROR_MEMORY_INVALID, this->eh_frame_->LastErrorCode());
EXPECT_EQ(0x1000U, this->eh_frame_->LastErrorAddress());
}
// We are assuming that pc rel, is really relative to the load_bias.
TYPED_TEST_P(DwarfEhFrameWithHdrTest, GetFdeInfoFromIndex_read_pcrel) {
this->eh_frame_->TestSetTableEncoding(DW_EH_PE_pcrel | DW_EH_PE_udata4);
this->eh_frame_->TestSetEntriesOffset(0x1000);
this->eh_frame_->TestSetEntriesDataOffset(0x3000);
this->eh_frame_->TestSetTableEntrySize(0x10);
this->memory_.SetData32(0x1040, 0x340);
this->memory_.SetData32(0x1044, 0x500);
auto info = this->eh_frame_->GetFdeInfoFromIndex(2);
ASSERT_TRUE(info != nullptr);
EXPECT_EQ(0x340U, info->pc);
EXPECT_EQ(0x500U, info->offset);
}
TYPED_TEST_P(DwarfEhFrameWithHdrTest, GetFdeInfoFromIndex_read_datarel) {
this->eh_frame_->TestSetTableEncoding(DW_EH_PE_datarel | DW_EH_PE_udata4);
this->eh_frame_->TestSetEntriesOffset(0x1000);
this->eh_frame_->TestSetEntriesDataOffset(0x3000);
this->eh_frame_->TestSetTableEntrySize(0x10);
this->memory_.SetData32(0x1040, 0x340);
this->memory_.SetData32(0x1044, 0x500);
auto info = this->eh_frame_->GetFdeInfoFromIndex(2);
ASSERT_TRUE(info != nullptr);
EXPECT_EQ(0x3340U, info->pc);
EXPECT_EQ(0x3500U, info->offset);
}
TYPED_TEST_P(DwarfEhFrameWithHdrTest, GetFdeInfoFromIndex_cached) {
this->eh_frame_->TestSetTableEncoding(DW_EH_PE_udata4);
this->eh_frame_->TestSetEntriesOffset(0x1000);
this->eh_frame_->TestSetTableEntrySize(0x10);
this->memory_.SetData32(0x1040, 0x340);
this->memory_.SetData32(0x1044, 0x500);
auto info = this->eh_frame_->GetFdeInfoFromIndex(2);
ASSERT_TRUE(info != nullptr);
EXPECT_EQ(0x340U, info->pc);
EXPECT_EQ(0x500U, info->offset);
// Clear the memory so that this will fail if it doesn't read cached data.
this->memory_.Clear();
info = this->eh_frame_->GetFdeInfoFromIndex(2);
ASSERT_TRUE(info != nullptr);
EXPECT_EQ(0x340U, info->pc);
EXPECT_EQ(0x500U, info->offset);
}
TYPED_TEST_P(DwarfEhFrameWithHdrTest, GetFdeOffsetFromPc_verify) {
this->eh_frame_->TestSetTableEntrySize(0x10);
typename DwarfEhFrameWithHdr<TypeParam>::FdeInfo info;
for (size_t i = 0; i < 10; i++) {
info.pc = 0x1000 * (i + 1);
info.offset = 0x5000 + i * 0x20;
this->eh_frame_->TestSetFdeInfo(i, info);
}
uint64_t fde_offset;
this->eh_frame_->TestSetFdeCount(10);
EXPECT_FALSE(this->eh_frame_->GetFdeOffsetFromPc(0x100, &fde_offset));
// Not an error, just not found.
ASSERT_EQ(DWARF_ERROR_NONE, this->eh_frame_->LastErrorCode());
// Even number of elements.
for (size_t i = 0; i < 10; i++) {
SCOPED_TRACE(testing::Message() << "Failed at index " << i);
TypeParam pc = 0x1000 * (i + 1);
EXPECT_TRUE(this->eh_frame_->GetFdeOffsetFromPc(pc, &fde_offset));
EXPECT_EQ(0x5000 + i * 0x20, fde_offset);
EXPECT_TRUE(this->eh_frame_->GetFdeOffsetFromPc(pc + 1, &fde_offset));
EXPECT_EQ(0x5000 + i * 0x20, fde_offset);
EXPECT_TRUE(this->eh_frame_->GetFdeOffsetFromPc(pc + 0xfff, &fde_offset));
EXPECT_EQ(0x5000 + i * 0x20, fde_offset);
}
// Odd number of elements.
this->eh_frame_->TestSetFdeCount(9);
for (size_t i = 0; i < 9; i++) {
SCOPED_TRACE(testing::Message() << "Failed at index " << i);
TypeParam pc = 0x1000 * (i + 1);
EXPECT_TRUE(this->eh_frame_->GetFdeOffsetFromPc(pc, &fde_offset));
EXPECT_EQ(0x5000 + i * 0x20, fde_offset);
EXPECT_TRUE(this->eh_frame_->GetFdeOffsetFromPc(pc + 1, &fde_offset));
EXPECT_EQ(0x5000 + i * 0x20, fde_offset);
EXPECT_TRUE(this->eh_frame_->GetFdeOffsetFromPc(pc + 0xfff, &fde_offset));
EXPECT_EQ(0x5000 + i * 0x20, fde_offset);
}
}
TYPED_TEST_P(DwarfEhFrameWithHdrTest, GetFdeOffsetFromPc_index_fail) {
this->eh_frame_->TestSetTableEntrySize(0x10);
this->eh_frame_->TestSetFdeCount(10);
uint64_t fde_offset;
EXPECT_FALSE(this->eh_frame_->GetFdeOffsetFromPc(0x1000, &fde_offset));
}
TYPED_TEST_P(DwarfEhFrameWithHdrTest, GetFdeOffsetFromPc_fail_fde_count) {
this->eh_frame_->TestSetFdeCount(0);
uint64_t fde_offset;
ASSERT_FALSE(this->eh_frame_->GetFdeOffsetFromPc(0x100, &fde_offset));
ASSERT_EQ(DWARF_ERROR_NONE, this->eh_frame_->LastErrorCode());
}
TYPED_TEST_P(DwarfEhFrameWithHdrTest, GetFdeOffsetFromPc_search) {
this->eh_frame_->TestSetTableEntrySize(16);
this->eh_frame_->TestSetFdeCount(10);
typename DwarfEhFrameWithHdr<TypeParam>::FdeInfo info;
info.pc = 0x550;
info.offset = 0x10500;
this->eh_frame_->TestSetFdeInfo(5, info);
info.pc = 0x750;
info.offset = 0x10700;
this->eh_frame_->TestSetFdeInfo(7, info);
info.pc = 0x850;
info.offset = 0x10800;
this->eh_frame_->TestSetFdeInfo(8, info);
uint64_t fde_offset;
ASSERT_TRUE(this->eh_frame_->GetFdeOffsetFromPc(0x800, &fde_offset));
EXPECT_EQ(0x10700U, fde_offset);
}
TYPED_TEST_P(DwarfEhFrameWithHdrTest, GetCieFde32) {
// CIE 32 information.
this->memory_.SetData32(0xf000, 0x100);
this->memory_.SetData32(0xf004, 0);
this->memory_.SetMemory(0xf008, std::vector<uint8_t>{1, '\0', 4, 8, 0x20});
// FDE 32 information.
this->memory_.SetData32(0x14000, 0x20);
this->memory_.SetData32(0x14004, 0x5004);
this->memory_.SetData32(0x14008, 0x9000);
this->memory_.SetData32(0x1400c, 0x100);
const DwarfFde* fde = this->eh_frame_->GetFdeFromOffset(0x14000);
ASSERT_TRUE(fde != nullptr);
EXPECT_EQ(0x14010U, fde->cfa_instructions_offset);
EXPECT_EQ(0x14024U, fde->cfa_instructions_end);
EXPECT_EQ(0x1d008U, fde->pc_start);
EXPECT_EQ(0x1d108U, fde->pc_end);
EXPECT_EQ(0xf000U, fde->cie_offset);
EXPECT_EQ(0U, fde->lsda_address);
ASSERT_TRUE(fde->cie != nullptr);
EXPECT_EQ(1U, fde->cie->version);
EXPECT_EQ(DW_EH_PE_sdata4, fde->cie->fde_address_encoding);
EXPECT_EQ(DW_EH_PE_omit, fde->cie->lsda_encoding);
EXPECT_EQ(0U, fde->cie->segment_size);
EXPECT_EQ(1U, fde->cie->augmentation_string.size());
EXPECT_EQ('\0', fde->cie->augmentation_string[0]);
EXPECT_EQ(0U, fde->cie->personality_handler);
EXPECT_EQ(0xf00dU, fde->cie->cfa_instructions_offset);
EXPECT_EQ(0xf104U, fde->cie->cfa_instructions_end);
EXPECT_EQ(4U, fde->cie->code_alignment_factor);
EXPECT_EQ(8, fde->cie->data_alignment_factor);
EXPECT_EQ(0x20U, fde->cie->return_address_register);
}
TYPED_TEST_P(DwarfEhFrameWithHdrTest, GetCieFde64) {
// CIE 64 information.
this->memory_.SetData32(0x6000, 0xffffffff);
this->memory_.SetData64(0x6004, 0x100);
this->memory_.SetData64(0x600c, 0);
this->memory_.SetMemory(0x6014, std::vector<uint8_t>{1, '\0', 4, 8, 0x20});
// FDE 64 information.
this->memory_.SetData32(0x8000, 0xffffffff);
this->memory_.SetData64(0x8004, 0x200);
this->memory_.SetData64(0x800c, 0x200c);
this->memory_.SetData64(0x8014, 0x5000);
this->memory_.SetData64(0x801c, 0x300);
const DwarfFde* fde = this->eh_frame_->GetFdeFromOffset(0x8000);
ASSERT_TRUE(fde != nullptr);
EXPECT_EQ(0x8024U, fde->cfa_instructions_offset);
EXPECT_EQ(0x820cU, fde->cfa_instructions_end);
EXPECT_EQ(0xd018U, fde->pc_start);
EXPECT_EQ(0xd318U, fde->pc_end);
EXPECT_EQ(0x6000U, fde->cie_offset);
EXPECT_EQ(0U, fde->lsda_address);
ASSERT_TRUE(fde->cie != nullptr);
EXPECT_EQ(1U, fde->cie->version);
EXPECT_EQ(DW_EH_PE_sdata8, fde->cie->fde_address_encoding);
EXPECT_EQ(DW_EH_PE_omit, fde->cie->lsda_encoding);
EXPECT_EQ(0U, fde->cie->segment_size);
EXPECT_EQ(1U, fde->cie->augmentation_string.size());
EXPECT_EQ('\0', fde->cie->augmentation_string[0]);
EXPECT_EQ(0U, fde->cie->personality_handler);
EXPECT_EQ(0x6019U, fde->cie->cfa_instructions_offset);
EXPECT_EQ(0x610cU, fde->cie->cfa_instructions_end);
EXPECT_EQ(4U, fde->cie->code_alignment_factor);
EXPECT_EQ(8, fde->cie->data_alignment_factor);
EXPECT_EQ(0x20U, fde->cie->return_address_register);
}
TYPED_TEST_P(DwarfEhFrameWithHdrTest, GetFdeFromPc_fde_not_found) {
this->eh_frame_->TestSetTableEntrySize(16);
this->eh_frame_->TestSetFdeCount(1);
typename DwarfEhFrameWithHdr<TypeParam>::FdeInfo info;
info.pc = 0x550;
info.offset = 0x10500;
this->eh_frame_->TestSetFdeInfo(0, info);
ASSERT_EQ(nullptr, this->eh_frame_->GetFdeFromPc(0x800));
}
REGISTER_TYPED_TEST_SUITE_P(DwarfEhFrameWithHdrTest, Init, Init_non_zero_load_bias, GetFdes,
GetFdeInfoFromIndex_expect_cache_fail, GetFdeInfoFromIndex_read_pcrel,
GetFdeInfoFromIndex_read_datarel, GetFdeInfoFromIndex_cached,
GetFdeOffsetFromPc_verify, GetFdeOffsetFromPc_index_fail,
GetFdeOffsetFromPc_fail_fde_count, GetFdeOffsetFromPc_search,
GetCieFde32, GetCieFde64, GetFdeFromPc_fde_not_found);
typedef ::testing::Types<uint32_t, uint64_t> DwarfEhFrameWithHdrTestTypes;
INSTANTIATE_TYPED_TEST_SUITE_P(, DwarfEhFrameWithHdrTest, DwarfEhFrameWithHdrTestTypes);
} // namespace unwindstack
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