[Lldb-commits] [lldb] [lldb] Add WebAssembly Process Plugin (PR #150143)

[Quentin Michaud via lldb-commits]

================
@@ -0,0 +1,127 @@
+//===----------------------------------------------------------------------===//
+//
+// 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 "ProcessWasm.h"
+#include "ThreadWasm.h"
+#include "lldb/Core/Module.h"
+#include "lldb/Core/PluginManager.h"
+#include "lldb/Core/Value.h"
+#include "lldb/Utility/DataBufferHeap.h"
+
+#include "lldb/Target/UnixSignals.h"
+
+using namespace lldb;
+using namespace lldb_private;
+using namespace lldb_private::process_gdb_remote;
+using namespace lldb_private::wasm;
+
+LLDB_PLUGIN_DEFINE(ProcessWasm)
+
+ProcessWasm::ProcessWasm(lldb::TargetSP target_sp, ListenerSP listener_sp)
+    : ProcessGDBRemote(target_sp, listener_sp) {
+  // Always use Linux signals for Wasm process.
+  m_unix_signals_sp = UnixSignals::Create(ArchSpec{"wasm32-Ant-wasi-wasm"});
+}
+
+void ProcessWasm::Initialize() {
+  static llvm::once_flag g_once_flag;
+
+  llvm::call_once(g_once_flag, []() {
+    PluginManager::RegisterPlugin(GetPluginNameStatic(),
+                                  GetPluginDescriptionStatic(), CreateInstance,
+                                  DebuggerInitialize);
+  });
+}
+
+void ProcessWasm::DebuggerInitialize(Debugger &debugger) {
+  ProcessGDBRemote::DebuggerInitialize(debugger);
+}
+
+llvm::StringRef ProcessWasm::GetPluginName() { return GetPluginNameStatic(); }
+
+llvm::StringRef ProcessWasm::GetPluginNameStatic() { return "wasm"; }
+
+llvm::StringRef ProcessWasm::GetPluginDescriptionStatic() {
+  return "GDB Remote protocol based WebAssembly debugging plug-in.";
+}
+
+void ProcessWasm::Terminate() {
+  PluginManager::UnregisterPlugin(ProcessWasm::CreateInstance);
+}
+
+lldb::ProcessSP ProcessWasm::CreateInstance(lldb::TargetSP target_sp,
+                                            ListenerSP listener_sp,
+                                            const FileSpec *crash_file_path,
+                                            bool can_connect) {
+  if (crash_file_path == nullptr)
+    return std::make_shared<ProcessWasm>(target_sp, listener_sp);
+  return {};
+}
+
+bool ProcessWasm::CanDebug(lldb::TargetSP target_sp,
+                           bool plugin_specified_by_name) {
+  if (plugin_specified_by_name)
+    return true;
+
+  if (Module *exe_module = target_sp->GetExecutableModulePointer()) {
+    if (ObjectFile *exe_objfile = exe_module->GetObjectFile())
+      return exe_objfile->GetArchitecture().GetMachine() ==
+             llvm::Triple::wasm32;
----------------
mh4ck-Thales wrote:

wasm64 is a [proposal](https://github.com/WebAssembly/memory64) for Wasm that was merged in the 2.0 spec this year. wasm64 is [well supported](https://webassembly.org/features/) by browsers, but for standalone Wasm and using WASIp2 the support is not there yet : https://github.com/WebAssembly/component-model/issues/22. So it makes sense to focus on wasm32 for now, I guess it shouldn't be too hard to add wasm64 support once it become more broadly used.

https://github.com/llvm/llvm-project/pull/150143