1 files changed, 239 insertions, 0 deletions
diff --git a/lldb/source/Plugins/ObjectFile/Breakpad/ObjectFileBreakpad.cpp b/lldb/source/Plugins/ObjectFile/Breakpad/ObjectFileBreakpad.cpp
new file mode 100644
index 00000000000..8134042ee09
--- /dev/null
+++ b/lldb/source/Plugins/ObjectFile/Breakpad/ObjectFileBreakpad.cpp
@@ -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
+}