1 files changed, 151 insertions, 0 deletions
diff --git a/lldb/source/Plugins/ObjectFile/wasm/ObjectFileWasm.h b/lldb/source/Plugins/ObjectFile/wasm/ObjectFileWasm.h
new file mode 100644
index 0000000000000..b6e906a7b15f5
--- /dev/null
+++ b/lldb/source/Plugins/ObjectFile/wasm/ObjectFileWasm.h
@@ -0,0 +1,151 @@
+//===-- ObjectFileWasm.h ----------------------------------------*- 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
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLDB_SOURCE_PLUGINS_OBJECTFILE_WASM_OBJECTFILEWASM_H
+#define LLDB_SOURCE_PLUGINS_OBJECTFILE_WASM_OBJECTFILEWASM_H
+
+#include "lldb/Symbol/ObjectFile.h"
+#include "lldb/Utility/ArchSpec.h"
+
+namespace lldb_private {
+namespace wasm {
+
+/// Generic Wasm object file reader.
+///
+/// This class provides a generic wasm32 reader plugin implementing the
+/// ObjectFile protocol.
+class ObjectFileWasm : public ObjectFile {
+public:
+  static void Initialize();
+  static void Terminate();
+
+  static ConstString GetPluginNameStatic();
+  static const char *GetPluginDescriptionStatic() {
+    return "WebAssembly 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 ObjectFile *CreateMemoryInstance(const lldb::ModuleSP &module_sp,
+                                          lldb::DataBufferSP &data_sp,
+                                          const lldb::ProcessSP &process_sp,
+                                          lldb::addr_t header_addr);
+
+  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; }
+  /// \}
+
+  /// LLVM RTTI support
+  /// \{
+  static char ID;
+  bool isA(const void *ClassID) const override {
+    return ClassID == &ID || ObjectFile::isA(ClassID);
+  }
+  static bool classof(const ObjectFile *obj) { return obj->isA(&ID); }
+  /// \}
+
+  /// 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 !!GetExternalDebugInfoFileSpec(); }
+
+  void CreateSections(SectionList &unified_section_list) override;
+
+  void Dump(Stream *s) override;
+
+  ArchSpec GetArchitecture() override { return m_arch; }
+
+  UUID GetUUID() override { return m_uuid; }
+
+  uint32_t GetDependentModules(FileSpecList &files) override { return 0; }
+
+  Type CalculateType() override { return eTypeSharedLibrary; }
+
+  Strata CalculateStrata() override { return eStrataUser; }
+
+  bool SetLoadAddress(lldb_private::Target &target, lldb::addr_t value,
+                      bool value_is_offset) override;
+
+  lldb_private::Address GetBaseAddress() override {
+    return IsInMemory() ? Address(m_memory_addr) : Address(0);
+  }
+  /// \}
+
+  /// A Wasm module that has external DWARF debug information should contain a
+  /// custom section named "external_debug_info", whose payload is an UTF-8
+  /// encoded string that points to a Wasm module that contains the debug
+  /// information for this module.
+  llvm::Optional<FileSpec> GetExternalDebugInfoFileSpec();
+
+private:
+  ObjectFileWasm(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);
+  ObjectFileWasm(const lldb::ModuleSP &module_sp,
+                 lldb::DataBufferSP &header_data_sp,
+                 const lldb::ProcessSP &process_sp, lldb::addr_t header_addr);
+
+  /// Wasm section decoding routines.
+  /// \{
+  bool DecodeNextSection(lldb::offset_t *offset_ptr);
+  bool DecodeSections();
+  /// \}
+
+  /// Read a range of bytes from the Wasm module.
+  DataExtractor ReadImageData(lldb::offset_t offset, uint32_t size);
+
+  typedef struct section_info {
+    lldb::offset_t offset;
+    uint32_t size;
+    uint32_t id;
+    ConstString name;
+  } section_info_t;
+
+  /// Wasm section header dump routines.
+  /// \{
+  void DumpSectionHeader(llvm::raw_ostream &ostream, const section_info_t &sh);
+  void DumpSectionHeaders(llvm::raw_ostream &ostream);
+  /// \}
+
+  std::vector<section_info_t> m_sect_infos;
+  ArchSpec m_arch;
+  UUID m_uuid;
+};
+
+} // namespace wasm
+} // namespace lldb_private
+#endif // LLDB_SOURCE_PLUGINS_OBJECTFILE_WASM_OBJECTFILEWASM_H