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//===- DWARFDataExtractorTest.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/DebugInfo/DWARF/DWARFDataExtractor.h"
#include "llvm/DebugInfo/DWARF/DWARFContext.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/ObjectYAML/yaml2obj.h"
#include "llvm/Testing/Support/Error.h"
#include "gtest/gtest.h"
using namespace llvm;
namespace {
TEST(DWARFDataExtractorTest, getRelocatedValue) {
StringRef Yaml = R"(
!ELF
FileHeader:
Class: ELFCLASS32
Data: ELFDATA2LSB
Type: ET_REL
Machine: EM_386
Sections:
- Name: .text
Type: SHT_PROGBITS
Size: 0x80
- Name: .debug_line
Type: SHT_PROGBITS
Content: '000000000000'
- Name: .rel.debug_line
Type: SHT_REL
Info: .debug_line
Relocations:
- Offset: 0
Symbol: f
Type: R_386_32
- Offset: 4
Symbol: f
Type: R_386_32
Symbols:
- Name: f
Type: STT_SECTION
Section: .text
Value: 0x42
)";
SmallString<0> Storage;
std::unique_ptr<object::ObjectFile> Obj = yaml::yaml2ObjectFile(
Storage, Yaml, [](const Twine &Err) { errs() << Err; });
ASSERT_TRUE(Obj);
std::unique_ptr<DWARFContext> Ctx = DWARFContext::create(*Obj);
const DWARFObject &DObj = Ctx->getDWARFObj();
ASSERT_EQ(6u, DObj.getLineSection().Data.size());
DWARFDataExtractor Data(DObj, DObj.getLineSection(), Obj->isLittleEndian(),
Obj->getBytesInAddress());
DataExtractor::Cursor C(0);
EXPECT_EQ(0x42u, Data.getRelocatedAddress(C));
EXPECT_EQ(0u, Data.getRelocatedAddress(C));
EXPECT_THAT_ERROR(
C.takeError(),
FailedWithMessage(
"unexpected end of data at offset 0x6 while reading [0x4, 0x8)"));
}
TEST(DWARFDataExtractorTest, getInitialLength) {
auto GetWithError = [](ArrayRef<uint8_t> Bytes)
-> Expected<std::tuple<uint64_t, dwarf::DwarfFormat, uint64_t>> {
DWARFDataExtractor Data(Bytes, /*IsLittleEndian=*/false, /*AddressSize=*/8);
DWARFDataExtractor::Cursor C(0);
uint64_t Length;
dwarf::DwarfFormat Format;
std::tie(Length, Format) = Data.getInitialLength(C);
if (C)
return std::make_tuple(Length, Format, C.tell());
EXPECT_EQ(Length, 0u);
EXPECT_EQ(Format, dwarf::DWARF32);
EXPECT_EQ(C.tell(), 0u);
return C.takeError();
};
auto GetWithoutError = [](ArrayRef<uint8_t> Bytes) {
DWARFDataExtractor Data(Bytes, /*IsLittleEndian=*/false, /*AddressSize=*/8);
uint64_t Offset = 0;
uint64_t Length;
dwarf::DwarfFormat Format;
std::tie(Length, Format) = Data.getInitialLength(&Offset);
return std::make_tuple(Length, Format, Offset);
};
auto ErrorResult = std::make_tuple(0, dwarf::DWARF32, 0);
// Empty data.
EXPECT_THAT_EXPECTED(
GetWithError({}),
FailedWithMessage(
"unexpected end of data at offset 0x0 while reading [0x0, 0x4)"));
EXPECT_EQ(GetWithoutError({}), ErrorResult);
// Not long enough for the U32 field.
EXPECT_THAT_EXPECTED(
GetWithError({0x00, 0x01, 0x02}),
FailedWithMessage(
"unexpected end of data at offset 0x3 while reading [0x0, 0x4)"));
EXPECT_EQ(GetWithoutError({0x00, 0x01, 0x02}), ErrorResult);
EXPECT_THAT_EXPECTED(
GetWithError({0x00, 0x01, 0x02, 0x03}),
HasValue(std::make_tuple(0x00010203, dwarf::DWARF32, 4)));
EXPECT_EQ(GetWithoutError({0x00, 0x01, 0x02, 0x03}),
std::make_tuple(0x00010203, dwarf::DWARF32, 4));
// Zeroes are not an error, but without the Error object it is hard to tell
// them apart from a failed read.
EXPECT_THAT_EXPECTED(
GetWithError({0x00, 0x00, 0x00, 0x00}),
HasValue(std::make_tuple(0x00000000, dwarf::DWARF32, 4)));
EXPECT_EQ(GetWithoutError({0x00, 0x00, 0x00, 0x00}),
std::make_tuple(0x00000000, dwarf::DWARF32, 4));
// Smallest invalid value.
EXPECT_THAT_EXPECTED(
GetWithError({0xff, 0xff, 0xff, 0xf0}),
FailedWithMessage(
"unsupported reserved unit length of value 0xfffffff0"));
EXPECT_EQ(GetWithoutError({0xff, 0xff, 0xff, 0xf0}), ErrorResult);
// DWARF64 marker without the subsequent length field.
EXPECT_THAT_EXPECTED(
GetWithError({0xff, 0xff, 0xff, 0xff}),
FailedWithMessage(
"unexpected end of data at offset 0x4 while reading [0x4, 0xc)"));
EXPECT_EQ(GetWithoutError({0xff, 0xff, 0xff, 0xff}), ErrorResult);
// Not enough data for the U64 length.
EXPECT_THAT_EXPECTED(
GetWithError({0xff, 0xff, 0xff, 0xff, 0x00, 0x01, 0x02, 0x03}),
FailedWithMessage(
"unexpected end of data at offset 0x8 while reading [0x4, 0xc)"));
EXPECT_EQ(GetWithoutError({0xff, 0xff, 0xff, 0xff, 0x00, 0x01, 0x02, 0x03}),
ErrorResult);
EXPECT_THAT_EXPECTED(
GetWithError({0xff, 0xff, 0xff, 0xff, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05,
0x06, 0x07}),
HasValue(std::make_tuple(0x0001020304050607, dwarf::DWARF64, 12)));
EXPECT_EQ(GetWithoutError({0xff, 0xff, 0xff, 0xff, 0x00, 0x01, 0x02, 0x03,
0x04, 0x05, 0x06, 0x07}),
std::make_tuple(0x0001020304050607, dwarf::DWARF64, 12));
}
TEST(DWARFDataExtractorTest, Truncation) {
StringRef Yaml = R"(
!ELF
FileHeader:
Class: ELFCLASS32
Data: ELFDATA2LSB
Type: ET_REL
Machine: EM_386
Sections:
- Name: .text
Type: SHT_PROGBITS
Size: 0x80
- Name: .debug_line
Type: SHT_PROGBITS
Content: '616263640000000065666768'
- Name: .rel.debug_line
Type: SHT_REL
Info: .debug_line
Relocations:
- Offset: 4
Symbol: f
Type: R_386_32
Symbols:
- Name: f
Type: STT_SECTION
Section: .text
Value: 0x42
)";
SmallString<0> Storage;
std::unique_ptr<object::ObjectFile> Obj = yaml::yaml2ObjectFile(
Storage, Yaml, [](const Twine &Err) { errs() << Err; });
ASSERT_TRUE(Obj);
std::unique_ptr<DWARFContext> Ctx = DWARFContext::create(*Obj);
const DWARFObject &DObj = Ctx->getDWARFObj();
ASSERT_EQ(12u, DObj.getLineSection().Data.size());
DWARFDataExtractor Data(DObj, DObj.getLineSection(), Obj->isLittleEndian(),
Obj->getBytesInAddress());
DataExtractor::Cursor C(0);
EXPECT_EQ(0x64636261u, Data.getRelocatedAddress(C));
EXPECT_EQ(0x42u, Data.getRelocatedAddress(C));
EXPECT_EQ(0x68676665u, Data.getRelocatedAddress(C));
EXPECT_THAT_ERROR(C.takeError(), Succeeded());
C = DataExtractor::Cursor{0};
DWARFDataExtractor Truncated8(Data, 8);
EXPECT_EQ(0x64636261u, Truncated8.getRelocatedAddress(C));
EXPECT_EQ(0x42u, Truncated8.getRelocatedAddress(C));
EXPECT_EQ(0x0u, Truncated8.getRelocatedAddress(C));
EXPECT_THAT_ERROR(
C.takeError(),
FailedWithMessage(
"unexpected end of data at offset 0x8 while reading [0x8, 0xc)"));
C = DataExtractor::Cursor{0};
DWARFDataExtractor Truncated6(Data, 6);
EXPECT_EQ(0x64636261u, Truncated6.getRelocatedAddress(C));
EXPECT_EQ(0x0u, Truncated6.getRelocatedAddress(C));
EXPECT_THAT_ERROR(
C.takeError(),
FailedWithMessage(
"unexpected end of data at offset 0x6 while reading [0x4, 0x8)"));
C = DataExtractor::Cursor{0};
DWARFDataExtractor Truncated2(Data, 2);
EXPECT_EQ(0x0u, Truncated2.getRelocatedAddress(C));
EXPECT_THAT_ERROR(
C.takeError(),
FailedWithMessage(
"unexpected end of data at offset 0x2 while reading [0x0, 0x4)"));
}
} // namespace
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