Import LLVM 10.0.0 release including clang, lld and lldb.

ok hackroom
tested by plenty

1 files changed, 235 insertions, 0 deletions

diff --git a/gnu/llvm/lldb/source/Plugins/ObjectContainer/Universal-Mach-O/ObjectContainerUniversalMachO.cpp b/gnu/llvm/lldb/source/Plugins/ObjectContainer/Universal-Mach-O/ObjectContainerUniversalMachO.cpp
new file mode 100644
index 00000000000..839a71cfdc7
--- /dev/null
+++ b/gnu/llvm/lldb/source/Plugins/ObjectContainer/Universal-Mach-O/ObjectContainerUniversalMachO.cpp
@@ -0,0 +1,235 @@
+//===-- ObjectContainerUniversalMachO.cpp -----------------------*- C++ -*-===//
+//
+// 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 "ObjectContainerUniversalMachO.h"
+#include "lldb/Core/Module.h"
+#include "lldb/Core/ModuleSpec.h"
+#include "lldb/Core/PluginManager.h"
+#include "lldb/Symbol/ObjectFile.h"
+#include "lldb/Target/Target.h"
+#include "lldb/Utility/ArchSpec.h"
+#include "lldb/Utility/DataBuffer.h"
+#include "lldb/Utility/Stream.h"
+
+using namespace lldb;
+using namespace lldb_private;
+using namespace llvm::MachO;
+
+void ObjectContainerUniversalMachO::Initialize() {
+  PluginManager::RegisterPlugin(GetPluginNameStatic(),
+                                GetPluginDescriptionStatic(), CreateInstance,
+                                GetModuleSpecifications);
+}
+
+void ObjectContainerUniversalMachO::Terminate() {
+  PluginManager::UnregisterPlugin(CreateInstance);
+}
+
+lldb_private::ConstString ObjectContainerUniversalMachO::GetPluginNameStatic() {
+  static ConstString g_name("mach-o");
+  return g_name;
+}
+
+const char *ObjectContainerUniversalMachO::GetPluginDescriptionStatic() {
+  return "Universal mach-o object container reader.";
+}
+
+ObjectContainer *ObjectContainerUniversalMachO::CreateInstance(
+    const lldb::ModuleSP &module_sp, DataBufferSP &data_sp,
+    lldb::offset_t data_offset, const FileSpec *file,
+    lldb::offset_t file_offset, lldb::offset_t length) {
+  // We get data when we aren't trying to look for cached container
+  // information, so only try and look for an architecture slice if we get data
+  if (data_sp) {
+    DataExtractor data;
+    data.SetData(data_sp, data_offset, length);
+    if (ObjectContainerUniversalMachO::MagicBytesMatch(data)) {
+      std::unique_ptr<ObjectContainerUniversalMachO> container_up(
+          new ObjectContainerUniversalMachO(module_sp, data_sp, data_offset,
+                                            file, file_offset, length));
+      if (container_up->ParseHeader()) {
+        return container_up.release();
+      }
+    }
+  }
+  return nullptr;
+}
+
+bool ObjectContainerUniversalMachO::MagicBytesMatch(const DataExtractor &data) {
+  lldb::offset_t offset = 0;
+  uint32_t magic = data.GetU32(&offset);
+  return magic == FAT_MAGIC || magic == FAT_CIGAM;
+}
+
+ObjectContainerUniversalMachO::ObjectContainerUniversalMachO(
+    const lldb::ModuleSP &module_sp, DataBufferSP &data_sp,
+    lldb::offset_t data_offset, const FileSpec *file,
+    lldb::offset_t file_offset, lldb::offset_t length)
+    : ObjectContainer(module_sp, file, file_offset, length, data_sp,
+                      data_offset),
+      m_header(), m_fat_archs() {
+  memset(&m_header, 0, sizeof(m_header));
+}
+
+ObjectContainerUniversalMachO::~ObjectContainerUniversalMachO() {}
+
+bool ObjectContainerUniversalMachO::ParseHeader() {
+  bool success = ParseHeader(m_data, m_header, m_fat_archs);
+  // We no longer need any data, we parsed all we needed to parse and cached it
+  // in m_header and m_fat_archs
+  m_data.Clear();
+  return success;
+}
+
+bool ObjectContainerUniversalMachO::ParseHeader(
+    lldb_private::DataExtractor &data, llvm::MachO::fat_header &header,
+    std::vector<llvm::MachO::fat_arch> &fat_archs) {
+  bool success = false;
+  // Store the file offset for this universal file as we could have a universal
+  // .o file in a BSD archive, or be contained in another kind of object.
+  // Universal mach-o files always have their headers in big endian.
+  lldb::offset_t offset = 0;
+  data.SetByteOrder(eByteOrderBig);
+  header.magic = data.GetU32(&offset);
+  fat_archs.clear();
+
+  if (header.magic == FAT_MAGIC) {
+
+    data.SetAddressByteSize(4);
+
+    header.nfat_arch = data.GetU32(&offset);
+
+    // Now we should have enough data for all of the fat headers, so lets index
+    // them so we know how many architectures that this universal binary
+    // contains.
+    uint32_t arch_idx = 0;
+    for (arch_idx = 0; arch_idx < header.nfat_arch; ++arch_idx) {
+      if (data.ValidOffsetForDataOfSize(offset, sizeof(fat_arch))) {
+        fat_arch arch;
+        if (data.GetU32(&offset, &arch, sizeof(fat_arch) / sizeof(uint32_t)))
+          fat_archs.push_back(arch);
+      }
+    }
+    success = true;
+  } else {
+    memset(&header, 0, sizeof(header));
+  }
+  return success;
+}
+
+void ObjectContainerUniversalMachO::Dump(Stream *s) const {
+  s->Printf("%p: ", static_cast<const void *>(this));
+  s->Indent();
+  const size_t num_archs = GetNumArchitectures();
+  const size_t num_objects = GetNumObjects();
+  s->Printf("ObjectContainerUniversalMachO, num_archs = %zu, num_objects = %zu",
+            num_archs, num_objects);
+  uint32_t i;
+  ArchSpec arch;
+  s->IndentMore();
+  for (i = 0; i < num_archs; i++) {
+    s->Indent();
+    GetArchitectureAtIndex(i, arch);
+    s->Printf("arch[%u] = %s\n", i, arch.GetArchitectureName());
+  }
+  for (i = 0; i < num_objects; i++) {
+    s->Indent();
+    s->Printf("object[%u] = %s\n", i, GetObjectNameAtIndex(i));
+  }
+  s->IndentLess();
+  s->EOL();
+}
+
+size_t ObjectContainerUniversalMachO::GetNumArchitectures() const {
+  return m_header.nfat_arch;
+}
+
+bool ObjectContainerUniversalMachO::GetArchitectureAtIndex(
+    uint32_t idx, ArchSpec &arch) const {
+  if (idx < m_header.nfat_arch) {
+    arch.SetArchitecture(eArchTypeMachO, m_fat_archs[idx].cputype,
+                         m_fat_archs[idx].cpusubtype);
+    return true;
+  }
+  return false;
+}
+
+ObjectFileSP
+ObjectContainerUniversalMachO::GetObjectFile(const FileSpec *file) {
+  uint32_t arch_idx = 0;
+  ArchSpec arch;
+  // If the module hasn't specified an architecture yet, set it to the default
+  // architecture:
+  ModuleSP module_sp(GetModule());
+  if (module_sp) {
+    if (!module_sp->GetArchitecture().IsValid()) {
+      arch = Target::GetDefaultArchitecture();
+      if (!arch.IsValid())
+        arch.SetTriple(LLDB_ARCH_DEFAULT);
+    } else
+      arch = module_sp->GetArchitecture();
+
+    ArchSpec curr_arch;
+    // First, try to find an exact match for the Arch of the Target.
+    for (arch_idx = 0; arch_idx < m_header.nfat_arch; ++arch_idx) {
+      if (GetArchitectureAtIndex(arch_idx, curr_arch) &&
+          arch.IsExactMatch(curr_arch))
+        break;
+    }
+
+    // Failing an exact match, try to find a compatible Arch of the Target.
+    if (arch_idx >= m_header.nfat_arch) {
+      for (arch_idx = 0; arch_idx < m_header.nfat_arch; ++arch_idx) {
+        if (GetArchitectureAtIndex(arch_idx, curr_arch) &&
+            arch.IsCompatibleMatch(curr_arch))
+          break;
+      }
+    }
+
+    if (arch_idx < m_header.nfat_arch) {
+      DataBufferSP data_sp;
+      lldb::offset_t data_offset = 0;
+      return ObjectFile::FindPlugin(
+          module_sp, file, m_offset + m_fat_archs[arch_idx].offset,
+          m_fat_archs[arch_idx].size, data_sp, data_offset);
+    }
+  }
+  return ObjectFileSP();
+}
+
+// PluginInterface protocol
+lldb_private::ConstString ObjectContainerUniversalMachO::GetPluginName() {
+  return GetPluginNameStatic();
+}
+
+uint32_t ObjectContainerUniversalMachO::GetPluginVersion() { return 1; }
+
+size_t ObjectContainerUniversalMachO::GetModuleSpecifications(
+    const lldb_private::FileSpec &file, lldb::DataBufferSP &data_sp,
+    lldb::offset_t data_offset, lldb::offset_t file_offset,
+    lldb::offset_t file_size, lldb_private::ModuleSpecList &specs) {
+  const size_t initial_count = specs.GetSize();
+
+  DataExtractor data;
+  data.SetData(data_sp, data_offset, data_sp->GetByteSize());
+
+  if (ObjectContainerUniversalMachO::MagicBytesMatch(data)) {
+    llvm::MachO::fat_header header;
+    std::vector<llvm::MachO::fat_arch> fat_archs;
+    if (ParseHeader(data, header, fat_archs)) {
+      for (const llvm::MachO::fat_arch &fat_arch : fat_archs) {
+        const lldb::offset_t slice_file_offset = fat_arch.offset + file_offset;
+        if (fat_arch.offset < file_size && file_size > slice_file_offset) {
+          ObjectFile::GetModuleSpecifications(
+              file, slice_file_offset, file_size - slice_file_offset, specs);
+        }
+      }
+    }
+  }
+  return specs.GetSize() - initial_count;
+}