[Lldb-commits] [lldb] [lldb] Implement WebAssembly debugging (PR #77949)

[Greg Clayton via lldb-commits]

================
@@ -0,0 +1,76 @@
+//===-- UnwindWasm.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 "UnwindWasm.h"
+#include "Plugins/Process/gdb-remote/ThreadGDBRemote.h"
+#include "Plugins/Process/wasm/ProcessWasm.h"
+#include "Plugins/Process/wasm/ThreadWasm.h"
+#include "lldb/lldb-forward.h"
+#include "wasmRegisterContext.h"
+
+using namespace lldb;
+using namespace lldb_private;
+using namespace process_gdb_remote;
+using namespace wasm;
+
+class WasmGDBRemoteRegisterContext : public GDBRemoteRegisterContext {
+public:
+  WasmGDBRemoteRegisterContext(ThreadGDBRemote &thread,
+                               uint32_t concrete_frame_idx,
+                               GDBRemoteDynamicRegisterInfoSP &reg_info_sp,
+                               uint64_t pc)
+      : GDBRemoteRegisterContext(thread, concrete_frame_idx, reg_info_sp, false,
+                                 false) {
+    PrivateSetRegisterValue(0, pc);
+  }
+};
+
+lldb::RegisterContextSP
+UnwindWasm::DoCreateRegisterContextForFrame(lldb_private::StackFrame *frame) {
+  if (m_frames.size() <= frame->GetFrameIndex()) {
+    return lldb::RegisterContextSP();
+  }
+
+  ThreadSP thread = frame->GetThread();
+  ProcessSP process_sp = thread->GetProcess();
+  ThreadWasm *wasm_thread = static_cast<ThreadWasm *>(thread.get());
+  ProcessWasm *wasm_process = static_cast<ProcessWasm *>(process_sp.get());
+  std::shared_ptr<WasmRegisterContext> reg_ctx_sp =
+      std::make_shared<WasmRegisterContext>(*wasm_thread,
+                                            frame->GetConcreteFrameIndex(),
+                                            wasm_process->GetRegisterInfo());
+  return reg_ctx_sp;
+}
+
+uint32_t UnwindWasm::DoGetFrameCount() {
+  if (!m_unwind_complete) {
+    m_unwind_complete = true;
+    m_frames.clear();
+
+    ThreadWasm &wasm_thread = static_cast<ThreadWasm &>(GetThread());
+    if (!wasm_thread.GetWasmCallStack(m_frames))
+      m_frames.clear();
+  }
+  return m_frames.size();
+}
+
+bool UnwindWasm::DoGetFrameInfoAtIndex(uint32_t frame_idx, lldb::addr_t &cfa,
+                                       lldb::addr_t &pc,
+                                       bool &behaves_like_zeroth_frame) {
+  if (m_frames.size() == 0) {
+    DoGetFrameCount();
+  }
----------------
clayborg wrote:

no braces for single line if statments per llvm coding guidelines.

https://github.com/llvm/llvm-project/pull/77949