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Introduce ObjectFileBreakpad 

Summary:
This patch adds the scaffolding necessary for lldb to recognise symbol
files generated by breakpad. These (textual) files contain just enough
information to be able to produce a backtrace from a crash
dump. This information includes:
- UUID, architecture and name of the module
- line tables
- list of symbols
- unwind information

A minimal breakpad file could look like this:
MODULE Linux x86_64 0000000024B5D199F0F766FFFFFF5DC30 a.out
INFO CODE_ID 00000000B52499D1F0F766FFFFFF5DC3
FILE 0 /tmp/a.c
FUNC 1010 10 0 _start
1010 4 4 0
1014 5 5 0
1019 5 6 0
101e 2 7 0
PUBLIC 1010 0 _start
STACK CFI INIT 1010 10 .cfa: $rsp 8 + .ra: .cfa -8 + ^
STACK CFI 1011 $rbp: .cfa -16 + ^ .cfa: $rsp 16 +
STACK CFI 1014 .cfa: $rbp 16 +

Even though this data would normally be considered "symbol" information,
in the current lldb infrastructure it is assumed every SymbolFile object
is backed by an ObjectFile instance. So, in order to better interoperate
with the rest of the code (particularly symbol vendors).

In this patch I just parse the breakpad header, which is enough to
populate the UUID and architecture fields of the ObjectFile interface.
The rough plan for followup patches is to expose the individual parts of
the breakpad file as ObjectFile "sections", which can then be used by
other parts of the codebase (SymbolFileBreakpad ?) to vend the necessary
information.

Reviewers: clayborg, zturner, lemo, amccarth

Subscribers: mgorny, fedor.sergeev, markmentovai, lldb-commits

Differential Revision: https://reviews.llvm.org/D55214

llvm-svn: 348592
This commit is contained in:
Pavel Labath 2018-12-07 14:20:27 +00:00
parent 4bf394be3a
commit d6e6e232ec
17 changed files with 502 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
lldb/include/lldb/Symbol/ObjectFile.h
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@ -817,4 +817,16 @@ private:
} // namespace lldb_private
namespace llvm {
template <> struct format_provider<lldb_private::ObjectFile::Type> {
static void format(const lldb_private::ObjectFile::Type &type,
raw_ostream &OS, StringRef Style);
};
template <> struct format_provider<lldb_private::ObjectFile::Strata> {
static void format(const lldb_private::ObjectFile::Strata &strata,
raw_ostream &OS, StringRef Style);
};
} // namespace llvm
#endif // liblldb_ObjectFile_h_

2
lldb/lit/Modules/Breakpad/Inputs/bad-module-id-1.syms Normal file
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@ -0,0 +1,2 @@
MODULE Linux x86_64 E5894855+C35D+CCCCCCCCCCCCCCCCCCCC0 linux.out
PUBLIC 1000 0 _start

2
lldb/lit/Modules/Breakpad/Inputs/bad-module-id-2.syms Normal file
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@ -0,0 +1,2 @@
MODULE Linux x86_64 E5894855C35DCCCCCCCCCCCCCCCCC linux.out
PUBLIC 1000 0 _start

2
lldb/lit/Modules/Breakpad/Inputs/bad-module-id-3.syms Normal file
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@ -0,0 +1,2 @@
MODULE Linux x86_64 E58X4855C35DCCCCCCCCXCCCCCCCCCCC0 linux.out
PUBLIC 1000 0 _start

6
lldb/lit/Modules/Breakpad/Inputs/identification-linux.syms Normal file
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@ -0,0 +1,6 @@
MODULE Linux x86_64 E5894855C35DCCCCCCCCCCCCCCCCCCCC0 linux.out
INFO CODE_ID 554889E55DC3CCCCCCCCCCCCCCCCCCCC
PUBLIC 1000 0 _start
STACK CFI INIT 1000 6 .cfa: $rsp 8 + .ra: .cfa -8 + ^
STACK CFI 1001 $rbp: .cfa -16 + ^ .cfa: $rsp 16 +
STACK CFI 1004 .cfa: $rbp 16 +

6
lldb/lit/Modules/Breakpad/Inputs/identification-macosx.syms Normal file
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@ -0,0 +1,6 @@
MODULE mac x86_64 D98C0E682089AA1BEACD6A8C1F16707B0 mac.out
PUBLIC 0 0 _mh_execute_header
PUBLIC f30 0 start
STACK CFI INIT f30 6 .cfa: $rsp 8 + .ra: .cfa -8 + ^
STACK CFI f31 $rbp: .cfa -16 + ^ .cfa: $rsp 16 +
STACK CFI f34 .cfa: $rbp 16 +

4
lldb/lit/Modules/Breakpad/Inputs/identification-windows.syms Normal file
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@ -0,0 +1,4 @@
MODULE windows x86 A0C9165780B5490981A1925EA62165C01 a.pdb
INFO CODE_ID 5C01672A4000 a.exe
FILE 1 c:\tmp\a.cpp
PUBLIC 1000 0 main

32
lldb/lit/Modules/Breakpad/breakpad-identification.test Normal file
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@ -0,0 +1,32 @@
RUN: lldb-test object-file %p/Inputs/identification-linux.syms | FileCheck %s --check-prefix=LINUX
RUN: lldb-test object-file %p/Inputs/identification-macosx.syms | FileCheck %s --check-prefix=MAC
RUN: lldb-test object-file %p/Inputs/identification-windows.syms | FileCheck %s --check-prefix=WINDOWS
RUN: not lldb-test object-file %p/Inputs/bad-module-id-1.syms 2>&1 | FileCheck %s --check-prefix=ERROR
RUN: not lldb-test object-file %p/Inputs/bad-module-id-2.syms 2>&1 | FileCheck %s --check-prefix=ERROR
RUN: not lldb-test object-file %p/Inputs/bad-module-id-3.syms 2>&1 | FileCheck %s --check-prefix=ERROR
LINUX: Plugin name: breakpad
LINUX: Architecture: x86_64--linux
LINUX: UUID: 554889E5-5DC3-CCCC-CCCC-CCCCCCCCCCCC
LINUX: Executable: false
LINUX: Stripped: false
LINUX: Type: debug info
LINUX: Strata: user
MAC: Plugin name: breakpad
MAC: Architecture: x86_64--macosx
MAC: UUID: 680E8CD9-8920-1BAA-EACD-6A8C1F16707B
MAC: Executable: false
MAC: Stripped: false
MAC: Type: debug info
MAC: Strata: user
WINDOWS: Plugin name: breakpad
WINDOWS: Architecture: i386--windows
WINDOWS: UUID: 5716C9A0-B580-0949-81A1-925EA62165C0-01000000
WINDOWS: Executable: false
WINDOWS: Stripped: false
WINDOWS: Type: debug info
WINDOWS: Strata: user
ERROR: not recognised as an object file

1
lldb/lit/Modules/Breakpad/lit.local.cfg Normal file
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@ -0,0 +1 @@
config.suffixes = ['.test']

3
lldb/source/API/SystemInitializerFull.cpp
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@ -62,6 +62,7 @@
#include "Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.h"
#include "Plugins/LanguageRuntime/RenderScript/RenderScriptRuntime/RenderScriptRuntime.h"
#include "Plugins/MemoryHistory/asan/MemoryHistoryASan.h"
#include "Plugins/ObjectFile/Breakpad/ObjectFileBreakpad.h"
#include "Plugins/ObjectFile/ELF/ObjectFileELF.h"
#include "Plugins/ObjectFile/Mach-O/ObjectFileMachO.h"
#include "Plugins/ObjectFile/PECOFF/ObjectFilePECOFF.h"
@ -268,6 +269,7 @@ SystemInitializerFull::Initialize(const InitializerOptions &options) {
if (auto e = SystemInitializerCommon::Initialize(options))
return e;
breakpad::ObjectFileBreakpad::Initialize();
ObjectFileELF::Initialize();
ObjectFileMachO::Initialize();
ObjectFilePECOFF::Initialize();
@ -525,6 +527,7 @@ void SystemInitializerFull::Terminate() {
PlatformDarwinKernel::Terminate();
#endif
breakpad::ObjectFileBreakpad::Terminate();
ObjectFileELF::Terminate();
ObjectFileMachO::Terminate();
ObjectFilePECOFF::Terminate();

11
lldb/source/Plugins/ObjectFile/Breakpad/CMakeLists.txt Normal file
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@ -0,0 +1,11 @@
add_lldb_library(lldbPluginObjectFileBreakpad PLUGIN
ObjectFileBreakpad.cpp
LINK_LIBS
lldbCore
lldbHost
lldbSymbol
lldbUtility
LINK_COMPONENTS
Support
)

239
lldb/source/Plugins/ObjectFile/Breakpad/ObjectFileBreakpad.cpp Normal file
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@ -0,0 +1,239 @@
//===-- ObjectFileBreakpad.cpp -------------------------------- -*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "Plugins/ObjectFile/Breakpad/ObjectFileBreakpad.h"
#include "lldb/Core/ModuleSpec.h"
#include "lldb/Core/PluginManager.h"
#include "lldb/Utility/DataBuffer.h"
#include "llvm/ADT/StringExtras.h"
using namespace lldb;
using namespace lldb_private;
using namespace lldb_private::breakpad;
namespace {
struct Header {
ArchSpec arch;
UUID uuid;
static llvm::Optional<Header> parse(llvm::StringRef text);
};
} // namespace
static llvm::Triple::OSType toOS(llvm::StringRef str) {
using llvm::Triple;
return llvm::StringSwitch<Triple::OSType>(str)
.Case("Linux", Triple::Linux)
.Case("mac", Triple::MacOSX)
.Case("windows", Triple::Win32)
.Default(Triple::UnknownOS);
}
static llvm::Triple::ArchType toArch(llvm::StringRef str) {
using llvm::Triple;
return llvm::StringSwitch<Triple::ArchType>(str)
.Case("arm", Triple::arm)
.Case("arm64", Triple::aarch64)
.Case("mips", Triple::mips)
.Case("ppc", Triple::ppc)
.Case("ppc64", Triple::ppc64)
.Case("s390", Triple::systemz)
.Case("sparc", Triple::sparc)
.Case("sparcv9", Triple::sparcv9)
.Case("x86", Triple::x86)
.Case("x86_64", Triple::x86_64)
.Default(Triple::UnknownArch);
}
static llvm::StringRef consume_front(llvm::StringRef &str, size_t n) {
llvm::StringRef result = str.take_front(n);
str = str.drop_front(n);
return result;
}
static UUID parseModuleId(llvm::Triple::OSType os, llvm::StringRef str) {
struct uuid_data {
llvm::support::ulittle32_t uuid1;
llvm::support::ulittle16_t uuid2[2];
uint8_t uuid3[8];
llvm::support::ulittle32_t age;
} data;
static_assert(sizeof(data) == 20, "");
// The textual module id encoding should be between 33 and 40 bytes long,
// depending on the size of the age field, which is of variable length.
// The first three chunks of the id are encoded in big endian, so we need to
// byte-swap those.
if (str.size() < 33 || str.size() > 40)
return UUID();
uint32_t t;
if (to_integer(consume_front(str, 8), t, 16))
data.uuid1 = t;
else
return UUID();
for (int i = 0; i < 2; ++i) {
if (to_integer(consume_front(str, 4), t, 16))
data.uuid2[i] = t;
else
return UUID();
}
for (int i = 0; i < 8; ++i) {
if (!to_integer(consume_front(str, 2), data.uuid3[i], 16))
return UUID();
}
if (to_integer(str, t, 16))
data.age = t;
else
return UUID();
// On non-windows, the age field should always be zero, so we don't include to
// match the native uuid format of these platforms.
return UUID::fromData(&data, os == llvm::Triple::Win32 ? 20 : 16);
}
llvm::Optional<Header> Header::parse(llvm::StringRef text) {
// A valid module should start with something like:
// MODULE Linux x86_64 E5894855C35DCCCCCCCCCCCCCCCCCCCC0 a.out
// optionally followed by
// INFO CODE_ID 554889E55DC3CCCCCCCCCCCCCCCCCCCC [a.exe]
llvm::StringRef token, line;
std::tie(line, text) = text.split('\n');
std::tie(token, line) = getToken(line);
if (token != "MODULE")
return llvm::None;
std::tie(token, line) = getToken(line);
llvm::Triple triple;
triple.setOS(toOS(token));
if (triple.getOS() == llvm::Triple::UnknownOS)
return llvm::None;
std::tie(token, line) = getToken(line);
triple.setArch(toArch(token));
if (triple.getArch() == llvm::Triple::UnknownArch)
return llvm::None;
llvm::StringRef module_id;
std::tie(module_id, line) = getToken(line);
std::tie(line, text) = text.split('\n');
std::tie(token, line) = getToken(line);
if (token == "INFO") {
std::tie(token, line) = getToken(line);
if (token != "CODE_ID")
return llvm::None;
std::tie(token, line) = getToken(line);
// If we don't have any text following the code id (e.g. on linux), we
// should use the module id as UUID. Otherwise, we revert back to the module
// id.
if (line.trim().empty()) {
UUID uuid;
if (uuid.SetFromStringRef(token, token.size() / 2) != token.size())
return llvm::None;
return Header{ArchSpec(triple), uuid};
}
}
// We reach here if we don't have a INFO CODE_ID section, or we chose not to
// use it. In either case, we need to properly decode the module id, whose
// fields are encoded in big-endian.
UUID uuid = parseModuleId(triple.getOS(), module_id);
if (!uuid)
return llvm::None;
return Header{ArchSpec(triple), uuid};
}
void ObjectFileBreakpad::Initialize() {
PluginManager::RegisterPlugin(GetPluginNameStatic(),
GetPluginDescriptionStatic(), CreateInstance,
nullptr, GetModuleSpecifications);
}
void ObjectFileBreakpad::Terminate() {
PluginManager::UnregisterPlugin(CreateInstance);
}
ConstString ObjectFileBreakpad::GetPluginNameStatic() {
static ConstString g_name("breakpad");
return g_name;
}
ObjectFile *ObjectFileBreakpad::CreateInstance(
const ModuleSP &module_sp, DataBufferSP &data_sp, offset_t data_offset,
const FileSpec *file, offset_t file_offset, offset_t length) {
if (!data_sp) {
data_sp = MapFileData(*file, length, file_offset);
if (!data_sp)
return nullptr;
data_offset = 0;
}
auto text = toStringRef(data_sp->GetData());
llvm::Optional<Header> header = Header::parse(text);
if (!header)
return nullptr;
// Update the data to contain the entire file if it doesn't already
if (data_sp->GetByteSize() < length) {
data_sp = MapFileData(*file, length, file_offset);
if (!data_sp)
return nullptr;
data_offset = 0;
}
return new ObjectFileBreakpad(module_sp, data_sp, data_offset, file,
file_offset, length, std::move(header->arch),
std::move(header->uuid));
}
size_t ObjectFileBreakpad::GetModuleSpecifications(
const FileSpec &file, DataBufferSP &data_sp, offset_t data_offset,
offset_t file_offset, offset_t length, ModuleSpecList &specs) {
auto text = toStringRef(data_sp->GetData());
llvm::Optional<Header> header = Header::parse(text);
if (!header)
return 0;
ModuleSpec spec(file, std::move(header->arch));
spec.GetUUID() = std::move(header->uuid);
specs.Append(spec);
return 1;
}
ObjectFileBreakpad::ObjectFileBreakpad(const ModuleSP &module_sp,
DataBufferSP &data_sp,
offset_t data_offset,
const FileSpec *file, offset_t offset,
offset_t length, ArchSpec arch,
UUID uuid)
: ObjectFile(module_sp, file, offset, length, data_sp, data_offset),
m_arch(std::move(arch)), m_uuid(std::move(uuid)) {}
bool ObjectFileBreakpad::ParseHeader() {
// We already parsed the header during initialization.
return true;
}
Symtab *ObjectFileBreakpad::GetSymtab() {
// TODO
return nullptr;
}
bool ObjectFileBreakpad::GetArchitecture(ArchSpec &arch) {
arch = m_arch;
return true;
}
bool ObjectFileBreakpad::GetUUID(UUID *uuid) {
*uuid = m_uuid;
return true;
}
void ObjectFileBreakpad::CreateSections(SectionList &unified_section_list) {
// TODO
}

104
lldb/source/Plugins/ObjectFile/Breakpad/ObjectFileBreakpad.h Normal file
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@ -0,0 +1,104 @@
//===-- ObjectFileBreakpad.h ---------------------------------- -*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef LLDB_PLUGINS_OBJECTFILE_BREAKPAD_OBJECTFILEBREAKPAD_H
#define LLDB_PLUGINS_OBJECTFILE_BREAKPAD_OBJECTFILEBREAKPAD_H
#include "lldb/Symbol/ObjectFile.h"
#include "lldb/Utility/ArchSpec.h"
#include "llvm/ADT/Triple.h"
namespace lldb_private {
namespace breakpad {
class ObjectFileBreakpad : public ObjectFile {
public:
//------------------------------------------------------------------
// Static Functions
//------------------------------------------------------------------
static void Initialize();
static void Terminate();
static ConstString GetPluginNameStatic();
static const char *GetPluginDescriptionStatic() {
return "Breakpad object file reader.";
}
static ObjectFile *
CreateInstance(const lldb::ModuleSP &module_sp, lldb::DataBufferSP &data_sp,
lldb::offset_t data_offset, const FileSpec *file,
lldb::offset_t file_offset, lldb::offset_t length);
static size_t GetModuleSpecifications(const FileSpec &file,
lldb::DataBufferSP &data_sp,
lldb::offset_t data_offset,
lldb::offset_t file_offset,
lldb::offset_t length,
ModuleSpecList &specs);
//------------------------------------------------------------------
// PluginInterface protocol
//------------------------------------------------------------------
ConstString GetPluginName() override { return GetPluginNameStatic(); }
uint32_t GetPluginVersion() override { return 1; }
//------------------------------------------------------------------
// ObjectFile Protocol.
//------------------------------------------------------------------
bool ParseHeader() override;
lldb::ByteOrder GetByteOrder() const override {
return m_arch.GetByteOrder();
}
bool IsExecutable() const override { return false; }
uint32_t GetAddressByteSize() const override {
return m_arch.GetAddressByteSize();
}
AddressClass GetAddressClass(lldb::addr_t file_addr) override {
return AddressClass::eInvalid;
}
Symtab *GetSymtab() override;
bool IsStripped() override { return false; }
void CreateSections(SectionList &unified_section_list) override;
void Dump(Stream *s) override {}
bool GetArchitecture(ArchSpec &arch) override;
bool GetUUID(UUID *uuid) override;
FileSpecList GetDebugSymbolFilePaths() override { return FileSpecList(); }
uint32_t GetDependentModules(FileSpecList &files) override { return 0; }
Type CalculateType() override { return eTypeDebugInfo; }
Strata CalculateStrata() override { return eStrataUser; }
private:
ArchSpec m_arch;
UUID m_uuid;
ObjectFileBreakpad(const lldb::ModuleSP &module_sp,
lldb::DataBufferSP &data_sp, lldb::offset_t data_offset,
const FileSpec *file, lldb::offset_t offset,
lldb::offset_t length, ArchSpec arch, UUID uuid);
};
} // namespace breakpad
} // namespace lldb_private
#endif // LLDB_PLUGINS_OBJECTFILE_BREAKPAD_OBJECTFILEBREAKPAD_H

3
lldb/source/Plugins/ObjectFile/CMakeLists.txt
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@ -1,4 +1,5 @@
add_subdirectory(Breakpad)
add_subdirectory(ELF)
add_subdirectory(Mach-O)
add_subdirectory(PECOFF)
add_subdirectory(JIT)
add_subdirectory(JIT)

60
lldb/source/Symbol/ObjectFile.cpp
View File

@ -688,3 +688,63 @@ DataBufferSP ObjectFile::MapFileData(const FileSpec &file, uint64_t Size,
uint64_t Offset) {
return FileSystem::Instance().CreateDataBuffer(file.GetPath(), Size, Offset);
}
void llvm::format_provider<ObjectFile::Type>::format(
const ObjectFile::Type &type, raw_ostream &OS, StringRef Style) {
switch (type) {
case ObjectFile::eTypeInvalid:
OS << "invalid";
break;
case ObjectFile::eTypeCoreFile:
OS << "core file";
break;
case ObjectFile::eTypeExecutable:
OS << "executable";
break;
case ObjectFile::eTypeDebugInfo:
OS << "debug info";
break;
case ObjectFile::eTypeDynamicLinker:
OS << "dynamic linker";
break;
case ObjectFile::eTypeObjectFile:
OS << "object file";
break;
case ObjectFile::eTypeSharedLibrary:
OS << "shared library";
break;
case ObjectFile::eTypeStubLibrary:
OS << "stub library";
break;
case ObjectFile::eTypeJIT:
OS << "jit";
break;
case ObjectFile::eTypeUnknown:
OS << "unknown";
break;
}
}
void llvm::format_provider<ObjectFile::Strata>::format(
const ObjectFile::Strata &strata, raw_ostream &OS, StringRef Style) {
switch (strata) {
case ObjectFile::eStrataInvalid:
OS << "invalid";
break;
case ObjectFile::eStrataUnknown:
OS << "unknown";
break;
case ObjectFile::eStrataUser:
OS << "user";
break;
case ObjectFile::eStrataKernel:
OS << "kernel";
break;
case ObjectFile::eStrataRawImage:
OS << "raw image";
break;
case ObjectFile::eStrataJIT:
OS << "jit";
break;
}
}

3
lldb/tools/lldb-test/SystemInitializerTest.cpp
View File

@ -52,6 +52,7 @@
#include "Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.h"
#include "Plugins/LanguageRuntime/RenderScript/RenderScriptRuntime/RenderScriptRuntime.h"
#include "Plugins/MemoryHistory/asan/MemoryHistoryASan.h"
#include "Plugins/ObjectFile/Breakpad/ObjectFileBreakpad.h"
#include "Plugins/ObjectFile/ELF/ObjectFileELF.h"
#include "Plugins/ObjectFile/Mach-O/ObjectFileMachO.h"
#include "Plugins/ObjectFile/PECOFF/ObjectFilePECOFF.h"
@ -116,6 +117,7 @@ SystemInitializerTest::Initialize(const InitializerOptions &options) {
if (auto e = SystemInitializerCommon::Initialize(options))
return e;
breakpad::ObjectFileBreakpad::Initialize();
ObjectFileELF::Initialize();
ObjectFileMachO::Initialize();
ObjectFilePECOFF::Initialize();
@ -331,6 +333,7 @@ void SystemInitializerTest::Terminate() {
PlatformDarwinKernel::Terminate();
#endif
breakpad::ObjectFileBreakpad::Terminate();
ObjectFileELF::Terminate();
ObjectFileMachO::Terminate();
ObjectFilePECOFF::Terminate();

13
lldb/tools/lldb-test/lldb-test.cpp
View File

@ -726,6 +726,14 @@ static int dumpObjectFiles(Debugger &Dbg) {
ModuleSpec Spec{FileSpec(File)};
auto ModulePtr = std::make_shared<lldb_private::Module>(Spec);
ObjectFile *ObjectPtr = ModulePtr->GetObjectFile();
if (!ObjectPtr) {
WithColor::error() << File << " not recognised as an object file\n";
HadErrors = 1;
continue;
}
// Fetch symbol vendor before we get the section list to give the symbol
// vendor a chance to populate it.
ModulePtr->GetSymbolVendor();
@ -736,9 +744,14 @@ static int dumpObjectFiles(Debugger &Dbg) {
continue;
}
Printer.formatLine("Plugin name: {0}", ObjectPtr->GetPluginName());
Printer.formatLine("Architecture: {0}",
ModulePtr->GetArchitecture().GetTriple().getTriple());
Printer.formatLine("UUID: {0}", ModulePtr->GetUUID().GetAsString());
Printer.formatLine("Executable: {0}", ObjectPtr->IsExecutable());
Printer.formatLine("Stripped: {0}", ObjectPtr->IsStripped());
Printer.formatLine("Type: {0}", ObjectPtr->GetType());
Printer.formatLine("Strata: {0}", ObjectPtr->GetStrata());
size_t Count = Sections->GetNumSections(0);
Printer.formatLine("Showing {0} sections", Count);