[Lldb-commits] [lldb] [lldb] Implement RegisterContextWasm (PR #151056)

[David Spickett via lldb-commits]

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@@ -0,0 +1,128 @@
+//===----------------------------------------------------------------------===//
+//
+// 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 "RegisterContextWasm.h"
+#include "Plugins/Process/gdb-remote/GDBRemoteRegisterContext.h"
+#include "ProcessWasm.h"
+#include "ThreadWasm.h"
+#include "lldb/Utility/LLDBLog.h"
+#include "lldb/Utility/Log.h"
+#include "lldb/Utility/RegisterValue.h"
+#include "llvm/Support/Error.h"
+#include <memory>
+
+using namespace lldb;
+using namespace lldb_private;
+using namespace lldb_private::process_gdb_remote;
+using namespace lldb_private::wasm;
+
+RegisterContextWasm::RegisterContextWasm(
+    wasm::ThreadWasm &thread, uint32_t concrete_frame_idx,
+    GDBRemoteDynamicRegisterInfoSP reg_info_sp)
+    : GDBRemoteRegisterContext(thread, concrete_frame_idx, reg_info_sp, false,
+                               false) {}
+
+RegisterContextWasm::~RegisterContextWasm() = default;
+
+uint32_t RegisterContextWasm::ConvertRegisterKindToRegisterNumber(
+    lldb::RegisterKind kind, uint32_t num) {
+  return num;
+}
+
+size_t RegisterContextWasm::GetRegisterCount() { return 0; }
+
+const RegisterInfo *RegisterContextWasm::GetRegisterInfoAtIndex(size_t reg) {
+  uint32_t tag = (reg >> kTagShift) & kTagMask;
+  if (tag == WasmVirtualRegisterKinds::eNotAWasmLocation)
+    return m_reg_info_sp->GetRegisterInfoAtIndex(reg & kIndexMask);
+
+  auto it = m_register_map.find(reg);
+  if (it == m_register_map.end()) {
+    WasmVirtualRegisterKinds kind = static_cast<WasmVirtualRegisterKinds>(tag);
+    std::tie(it, std::ignore) = m_register_map.insert(
+        {reg,
+         std::make_unique<WasmVirtualRegisterInfo>(kind, reg & kIndexMask)});
+  }
+  return it->second.get();
+}
+
+size_t RegisterContextWasm::GetRegisterSetCount() { return 0; }
+
+const RegisterSet *RegisterContextWasm::GetRegisterSet(size_t reg_set) {
+  return nullptr;
+}
+
+bool RegisterContextWasm::ReadRegister(const RegisterInfo *reg_info,
+                                       RegisterValue &value) {
+  if (reg_info->name)
+    return GDBRemoteRegisterContext::ReadRegister(reg_info, value);
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DavidSpickett wrote:

What ends up here then? Would this just be reads of "pc"? Or can you get here by reading the runtime's host's registers?

https://github.com/llvm/llvm-project/pull/151056