1 files changed, 176 insertions, 0 deletions
diff --git a/lldb/source/Plugins/ObjectFile/JSON/ObjectFileJSON.cpp b/lldb/source/Plugins/ObjectFile/JSON/ObjectFileJSON.cpp
new file mode 100644
index 0000000..7cd836a
--- /dev/null
+++ b/lldb/source/Plugins/ObjectFile/JSON/ObjectFileJSON.cpp
@@ -0,0 +1,176 @@
+//===-- ObjectFileJSON.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 "Plugins/ObjectFile/JSON/ObjectFileJSON.h"
+#include "lldb/Core/Module.h"
+#include "lldb/Core/ModuleSpec.h"
+#include "lldb/Core/PluginManager.h"
+#include "lldb/Core/Section.h"
+#include "lldb/Symbol/Symbol.h"
+#include "lldb/Utility/LLDBLog.h"
+#include "lldb/Utility/Log.h"
+#include "llvm/ADT/DenseSet.h"
+#include <optional>
+
+using namespace llvm;
+using namespace lldb;
+using namespace lldb_private;
+
+LLDB_PLUGIN_DEFINE(ObjectFileJSON)
+
+char ObjectFileJSON::ID;
+
+void ObjectFileJSON::Initialize() {
+  PluginManager::RegisterPlugin(GetPluginNameStatic(),
+                                GetPluginDescriptionStatic(), CreateInstance,
+                                CreateMemoryInstance, GetModuleSpecifications);
+}
+
+void ObjectFileJSON::Terminate() {
+  PluginManager::UnregisterPlugin(CreateInstance);
+}
+
+ObjectFile *
+ObjectFileJSON::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;
+  }
+
+  if (!MagicBytesMatch(data_sp, 0, data_sp->GetByteSize()))
+    return nullptr;
+
+  if (data_sp->GetByteSize() < length) {
+    data_sp = MapFileData(*file, length, file_offset);
+    if (!data_sp)
+      return nullptr;
+    data_offset = 0;
+  }
+
+  auto text =
+      llvm::StringRef(reinterpret_cast<const char *>(data_sp->GetBytes()));
+
+  Expected<json::Value> json = json::parse(text);
+  if (!json) {
+    llvm::consumeError(json.takeError());
+    return nullptr;
+  }
+
+  json::Path::Root root;
+  Header header;
+  if (!fromJSON(*json, header, root))
+    return nullptr;
+
+  ArchSpec arch(header.triple);
+  UUID uuid;
+  uuid.SetFromStringRef(header.uuid);
+
+  Body body;
+  fromJSON(*json, body, root);
+
+  return new ObjectFileJSON(module_sp, data_sp, data_offset, file, file_offset,
+                            length, std::move(arch), std::move(uuid),
+                            std::move(body.symbols));
+}
+
+ObjectFile *ObjectFileJSON::CreateMemoryInstance(const ModuleSP &module_sp,
+                                                 WritableDataBufferSP data_sp,
+                                                 const ProcessSP &process_sp,
+                                                 addr_t header_addr) {
+  return nullptr;
+}
+
+size_t ObjectFileJSON::GetModuleSpecifications(
+    const FileSpec &file, DataBufferSP &data_sp, offset_t data_offset,
+    offset_t file_offset, offset_t length, ModuleSpecList &specs) {
+
+  if (!MagicBytesMatch(data_sp, data_offset, data_sp->GetByteSize()))
+    return 0;
+
+  auto text =
+      llvm::StringRef(reinterpret_cast<const char *>(data_sp->GetBytes()));
+
+  Expected<json::Value> json = json::parse(text);
+  if (!json) {
+    llvm::consumeError(json.takeError());
+    return 0;
+  }
+
+  json::Path::Root root;
+  Header header;
+  if (!fromJSON(*json, header, root))
+    return 0;
+
+  ArchSpec arch(header.triple);
+  UUID uuid;
+  uuid.SetFromStringRef(header.uuid);
+
+  ModuleSpec spec(file, std::move(arch));
+  spec.GetUUID() = std::move(uuid);
+  specs.Append(spec);
+  return 1;
+}
+
+ObjectFileJSON::ObjectFileJSON(const ModuleSP &module_sp, DataBufferSP &data_sp,
+                               offset_t data_offset, const FileSpec *file,
+                               offset_t offset, offset_t length, ArchSpec arch,
+                               UUID uuid, std::vector<JSONSymbol> symbols)
+    : ObjectFile(module_sp, file, offset, length, data_sp, data_offset),
+      m_arch(std::move(arch)), m_uuid(std::move(uuid)),
+      m_symbols(std::move(symbols)) {}
+
+bool ObjectFileJSON::ParseHeader() {
+  // We already parsed the header during initialization.
+  return true;
+}
+
+void ObjectFileJSON::ParseSymtab(Symtab &symtab) {
+  Log *log = GetLog(LLDBLog::Symbols);
+  SectionList *section_list = GetModule()->GetSectionList();
+  for (JSONSymbol json_symbol : m_symbols) {
+    llvm::Expected<Symbol> symbol = Symbol::FromJSON(json_symbol, section_list);
+    if (!symbol) {
+      LLDB_LOG_ERROR(log, symbol.takeError(), "invalid symbol");
+      continue;
+    }
+    symtab.AddSymbol(*symbol);
+  }
+  symtab.Finalize();
+}
+
+void ObjectFileJSON::CreateSections(SectionList &unified_section_list) {}
+
+bool ObjectFileJSON::MagicBytesMatch(DataBufferSP data_sp,
+                                     lldb::addr_t data_offset,
+                                     lldb::addr_t data_length) {
+  DataExtractor data;
+  data.SetData(data_sp, data_offset, data_length);
+  lldb::offset_t offset = 0;
+  uint32_t magic = data.GetU8(&offset);
+  return magic == '{';
+}
+
+namespace lldb_private {
+
+bool fromJSON(const json::Value &value, ObjectFileJSON::Header &header,
+              json::Path path) {
+  json::ObjectMapper o(value, path);
+  return o && o.map("triple", header.triple) && o.map("uuid", header.uuid);
+}
+
+bool fromJSON(const json::Value &value, ObjectFileJSON::Body &body,
+              json::Path path) {
+  json::ObjectMapper o(value, path);
+  return o && o.map("symbols", body.symbols);
+}
+
+} // namespace lldb_private