1 files changed, 139 insertions, 0 deletions
diff --git a/contrib/llvm-project/lldb/source/Plugins/SymbolVendor/wasm/SymbolVendorWasm.cpp b/contrib/llvm-project/lldb/source/Plugins/SymbolVendor/wasm/SymbolVendorWasm.cpp
new file mode 100644
index 000000000000..f8a9389c0ff9
--- /dev/null
+++ b/contrib/llvm-project/lldb/source/Plugins/SymbolVendor/wasm/SymbolVendorWasm.cpp
@@ -0,0 +1,139 @@
+//===-- SymbolVendorWasm.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 "SymbolVendorWasm.h"
+
+#include <cstring>
+#include <optional>
+
+#include "Plugins/ObjectFile/wasm/ObjectFileWasm.h"
+#include "lldb/Core/Module.h"
+#include "lldb/Core/ModuleSpec.h"
+#include "lldb/Core/PluginManager.h"
+#include "lldb/Core/Section.h"
+#include "lldb/Host/Host.h"
+#include "lldb/Symbol/ObjectFile.h"
+#include "lldb/Target/Target.h"
+#include "lldb/Utility/StreamString.h"
+#include "lldb/Utility/Timer.h"
+
+using namespace lldb;
+using namespace lldb_private;
+using namespace lldb_private::wasm;
+
+LLDB_PLUGIN_DEFINE(SymbolVendorWasm)
+
+// SymbolVendorWasm constructor
+SymbolVendorWasm::SymbolVendorWasm(const lldb::ModuleSP &module_sp)
+    : SymbolVendor(module_sp) {}
+
+void SymbolVendorWasm::Initialize() {
+  PluginManager::RegisterPlugin(GetPluginNameStatic(),
+                                GetPluginDescriptionStatic(), CreateInstance);
+}
+
+void SymbolVendorWasm::Terminate() {
+  PluginManager::UnregisterPlugin(CreateInstance);
+}
+
+llvm::StringRef SymbolVendorWasm::GetPluginDescriptionStatic() {
+  return "Symbol vendor for WASM that looks for dwo files that match "
+         "executables.";
+}
+
+// CreateInstance
+//
+// Platforms can register a callback to use when creating symbol vendors to
+// allow for complex debug information file setups, and to also allow for
+// finding separate debug information files.
+SymbolVendor *
+SymbolVendorWasm::CreateInstance(const lldb::ModuleSP &module_sp,
+                                 lldb_private::Stream *feedback_strm) {
+  if (!module_sp)
+    return nullptr;
+
+  ObjectFileWasm *obj_file =
+      llvm::dyn_cast_or_null<ObjectFileWasm>(module_sp->GetObjectFile());
+  if (!obj_file)
+    return nullptr;
+
+  // If the main object file already contains debug info, then we are done.
+  if (obj_file->GetSectionList()->FindSectionByType(
+          lldb::eSectionTypeDWARFDebugInfo, true))
+    return nullptr;
+
+  LLDB_SCOPED_TIMERF("SymbolVendorWasm::CreateInstance (module = %s)",
+                     module_sp->GetFileSpec().GetPath().c_str());
+
+  ModuleSpec module_spec;
+  module_spec.GetFileSpec() = obj_file->GetFileSpec();
+  FileSystem::Instance().Resolve(module_spec.GetFileSpec());
+  module_spec.GetUUID() = obj_file->GetUUID();
+
+  // A Wasm module may have a custom section named "external_debug_info" whose
+  // content is the absolute or relative path of the Wasm module that contains
+  // debug symbols for this module.
+  std::optional<FileSpec> symbol_file_spec =
+      obj_file->GetExternalDebugInfoFileSpec();
+  if (!symbol_file_spec)
+    return nullptr;
+  module_spec.GetSymbolFileSpec() = *symbol_file_spec;
+
+  FileSpecList search_paths = Target::GetDefaultDebugFileSearchPaths();
+  FileSpec sym_fspec =
+      PluginManager::LocateExecutableSymbolFile(module_spec, search_paths);
+  if (!sym_fspec)
+    return nullptr;
+
+  DataBufferSP sym_file_data_sp;
+  lldb::offset_t sym_file_data_offset = 0;
+  ObjectFileSP sym_objfile_sp = ObjectFile::FindPlugin(
+      module_sp, &sym_fspec, 0, FileSystem::Instance().GetByteSize(sym_fspec),
+      sym_file_data_sp, sym_file_data_offset);
+  if (!sym_objfile_sp)
+    return nullptr;
+
+  // This objfile is for debugging purposes.
+  sym_objfile_sp->SetType(ObjectFile::eTypeDebugInfo);
+
+  SymbolVendorWasm *symbol_vendor = new SymbolVendorWasm(module_sp);
+
+  // Get the module unified section list and add our debug sections to
+  // that.
+  SectionList *module_section_list = module_sp->GetSectionList();
+  SectionList *objfile_section_list = sym_objfile_sp->GetSectionList();
+
+  if (!module_section_list || !objfile_section_list)
+    return nullptr;
+
+  static const SectionType g_sections[] = {
+      eSectionTypeDWARFDebugAbbrev,   eSectionTypeDWARFDebugAddr,
+      eSectionTypeDWARFDebugAranges,  eSectionTypeDWARFDebugCuIndex,
+      eSectionTypeDWARFDebugFrame,    eSectionTypeDWARFDebugInfo,
+      eSectionTypeDWARFDebugLine,     eSectionTypeDWARFDebugLineStr,
+      eSectionTypeDWARFDebugLoc,      eSectionTypeDWARFDebugLocLists,
+      eSectionTypeDWARFDebugMacInfo,  eSectionTypeDWARFDebugMacro,
+      eSectionTypeDWARFDebugPubNames, eSectionTypeDWARFDebugPubTypes,
+      eSectionTypeDWARFDebugRanges,   eSectionTypeDWARFDebugRngLists,
+      eSectionTypeDWARFDebugStr,      eSectionTypeDWARFDebugStrOffsets,
+      eSectionTypeDWARFDebugTypes};
+  for (SectionType section_type : g_sections) {
+    if (SectionSP section_sp =
+            objfile_section_list->FindSectionByType(section_type, true)) {
+      if (SectionSP module_section_sp =
+              module_section_list->FindSectionByType(section_type, true))
+        module_section_list->ReplaceSection(module_section_sp->GetID(),
+                                            section_sp);
+      else
+        module_section_list->AddSection(section_sp);
+    }
+  }
+
+  symbol_vendor->AddSymbolFileRepresentation(sym_objfile_sp);
+  return symbol_vendor;
+}