1 files changed, 191 insertions, 0 deletions
diff --git a/contrib/llvm-project/lldb/source/Plugins/ScriptInterpreter/Lua/Lua.cpp b/contrib/llvm-project/lldb/source/Plugins/ScriptInterpreter/Lua/Lua.cpp
new file mode 100644
index 000000000000..8dad22d077be
--- /dev/null
+++ b/contrib/llvm-project/lldb/source/Plugins/ScriptInterpreter/Lua/Lua.cpp
@@ -0,0 +1,191 @@
+//===-- Lua.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 "Lua.h"
+#include "SWIGLuaBridge.h"
+#include "lldb/Host/FileSystem.h"
+#include "lldb/Utility/FileSpec.h"
+#include "llvm/Support/Error.h"
+#include "llvm/Support/FormatVariadic.h"
+
+using namespace lldb_private;
+using namespace lldb;
+
+static int lldb_print(lua_State *L) {
+  int n = lua_gettop(L);
+  lua_getglobal(L, "io");
+  lua_getfield(L, -1, "stdout");
+  lua_getfield(L, -1, "write");
+  for (int i = 1; i <= n; i++) {
+    lua_pushvalue(L, -1); // write()
+    lua_pushvalue(L, -3); // io.stdout
+    luaL_tolstring(L, i, nullptr);
+    lua_pushstring(L, i != n ? "\t" : "\n");
+    lua_call(L, 3, 0);
+  }
+  return 0;
+}
+
+Lua::Lua() : m_lua_state(luaL_newstate()) {
+  assert(m_lua_state);
+  luaL_openlibs(m_lua_state);
+  luaopen_lldb(m_lua_state);
+  lua_pushcfunction(m_lua_state, lldb_print);
+  lua_setglobal(m_lua_state, "print");
+}
+
+Lua::~Lua() {
+  assert(m_lua_state);
+  lua_close(m_lua_state);
+}
+
+llvm::Error Lua::Run(llvm::StringRef buffer) {
+  int error =
+      luaL_loadbuffer(m_lua_state, buffer.data(), buffer.size(), "buffer") ||
+      lua_pcall(m_lua_state, 0, 0, 0);
+  if (error == LUA_OK)
+    return llvm::Error::success();
+
+  llvm::Error e = llvm::make_error<llvm::StringError>(
+      llvm::formatv("{0}\n", lua_tostring(m_lua_state, -1)),
+      llvm::inconvertibleErrorCode());
+  // Pop error message from the stack.
+  lua_pop(m_lua_state, 1);
+  return e;
+}
+
+llvm::Error Lua::RegisterBreakpointCallback(void *baton, const char *body) {
+  lua_pushlightuserdata(m_lua_state, baton);
+  const char *fmt_str = "return function(frame, bp_loc, ...) {0} end";
+  std::string func_str = llvm::formatv(fmt_str, body).str();
+  if (luaL_dostring(m_lua_state, func_str.c_str()) != LUA_OK) {
+    llvm::Error e = llvm::make_error<llvm::StringError>(
+        llvm::formatv("{0}", lua_tostring(m_lua_state, -1)),
+        llvm::inconvertibleErrorCode());
+    // Pop error message from the stack.
+    lua_pop(m_lua_state, 2);
+    return e;
+  }
+  lua_settable(m_lua_state, LUA_REGISTRYINDEX);
+  return llvm::Error::success();
+}
+
+llvm::Expected<bool>
+Lua::CallBreakpointCallback(void *baton, lldb::StackFrameSP stop_frame_sp,
+                            lldb::BreakpointLocationSP bp_loc_sp,
+                            StructuredData::ObjectSP extra_args_sp) {
+
+  lua_pushlightuserdata(m_lua_state, baton);
+  lua_gettable(m_lua_state, LUA_REGISTRYINDEX);
+  StructuredDataImpl extra_args_impl(std::move(extra_args_sp));
+  return lua::SWIGBridge::LLDBSwigLuaBreakpointCallbackFunction(
+      m_lua_state, stop_frame_sp, bp_loc_sp, extra_args_impl);
+}
+
+llvm::Error Lua::RegisterWatchpointCallback(void *baton, const char *body) {
+  lua_pushlightuserdata(m_lua_state, baton);
+  const char *fmt_str = "return function(frame, wp, ...) {0} end";
+  std::string func_str = llvm::formatv(fmt_str, body).str();
+  if (luaL_dostring(m_lua_state, func_str.c_str()) != LUA_OK) {
+    llvm::Error e = llvm::make_error<llvm::StringError>(
+        llvm::formatv("{0}", lua_tostring(m_lua_state, -1)),
+        llvm::inconvertibleErrorCode());
+    // Pop error message from the stack.
+    lua_pop(m_lua_state, 2);
+    return e;
+  }
+  lua_settable(m_lua_state, LUA_REGISTRYINDEX);
+  return llvm::Error::success();
+}
+
+llvm::Expected<bool>
+Lua::CallWatchpointCallback(void *baton, lldb::StackFrameSP stop_frame_sp,
+                            lldb::WatchpointSP wp_sp) {
+
+  lua_pushlightuserdata(m_lua_state, baton);
+  lua_gettable(m_lua_state, LUA_REGISTRYINDEX);
+  return lua::SWIGBridge::LLDBSwigLuaWatchpointCallbackFunction(
+      m_lua_state, stop_frame_sp, wp_sp);
+}
+
+llvm::Error Lua::CheckSyntax(llvm::StringRef buffer) {
+  int error =
+      luaL_loadbuffer(m_lua_state, buffer.data(), buffer.size(), "buffer");
+  if (error == LUA_OK) {
+    // Pop buffer
+    lua_pop(m_lua_state, 1);
+    return llvm::Error::success();
+  }
+
+  llvm::Error e = llvm::make_error<llvm::StringError>(
+      llvm::formatv("{0}\n", lua_tostring(m_lua_state, -1)),
+      llvm::inconvertibleErrorCode());
+  // Pop error message from the stack.
+  lua_pop(m_lua_state, 1);
+  return e;
+}
+
+llvm::Error Lua::LoadModule(llvm::StringRef filename) {
+  const FileSpec file(filename);
+  if (!FileSystem::Instance().Exists(file)) {
+    return llvm::make_error<llvm::StringError>("invalid path",
+                                               llvm::inconvertibleErrorCode());
+  }
+
+  if (file.GetFileNameExtension() != ".lua") {
+    return llvm::make_error<llvm::StringError>("invalid extension",
+                                               llvm::inconvertibleErrorCode());
+  }
+
+  int error = luaL_loadfile(m_lua_state, filename.data()) ||
+              lua_pcall(m_lua_state, 0, 1, 0);
+  if (error != LUA_OK) {
+    llvm::Error e = llvm::make_error<llvm::StringError>(
+        llvm::formatv("{0}\n", lua_tostring(m_lua_state, -1)),
+        llvm::inconvertibleErrorCode());
+    // Pop error message from the stack.
+    lua_pop(m_lua_state, 1);
+    return e;
+  }
+
+  ConstString module_name = file.GetFileNameStrippingExtension();
+  lua_setglobal(m_lua_state, module_name.GetCString());
+  return llvm::Error::success();
+}
+
+llvm::Error Lua::ChangeIO(FILE *out, FILE *err) {
+  assert(out != nullptr);
+  assert(err != nullptr);
+
+  lua_getglobal(m_lua_state, "io");
+
+  lua_getfield(m_lua_state, -1, "stdout");
+  if (luaL_Stream *s = static_cast<luaL_Stream *>(
+          luaL_testudata(m_lua_state, -1, LUA_FILEHANDLE))) {
+    s->f = out;
+    lua_pop(m_lua_state, 1);
+  } else {
+    lua_pop(m_lua_state, 2);
+    return llvm::make_error<llvm::StringError>("could not get stdout",
+                                               llvm::inconvertibleErrorCode());
+  }
+
+  lua_getfield(m_lua_state, -1, "stderr");
+  if (luaL_Stream *s = static_cast<luaL_Stream *>(
+          luaL_testudata(m_lua_state, -1, LUA_FILEHANDLE))) {
+    s->f = out;
+    lua_pop(m_lua_state, 1);
+  } else {
+    lua_pop(m_lua_state, 2);
+    return llvm::make_error<llvm::StringError>("could not get stderr",
+                                               llvm::inconvertibleErrorCode());
+  }
+
+  lua_pop(m_lua_state, 1);
+  return llvm::Error::success();
+}