Add support for Lua scripted watchpoints, with basic tests.
Differential Revision: https://reviews.llvm.org/D105034
}
void
+PushSBClass (lua_State* L, lldb::SBWatchpoint* watchpoint_sb)
+{
+ SWIG_NewPointerObj(L, watchpoint_sb, SWIGTYPE_p_lldb__SBWatchpoint, 0);
+}
+
+void
PushSBClass (lua_State* L, lldb::SBStructuredData* structured_data_sb)
{
SWIG_NewPointerObj(L, structured_data_sb, SWIGTYPE_p_lldb__SBStructuredData, 0);
return stop;
}
+// This function is called from Lua::CallWatchpointCallback
+SWIGEXPORT llvm::Expected<bool>
+LLDBSwigLuaWatchpointCallbackFunction
+(
+ lua_State *L,
+ lldb::StackFrameSP stop_frame_sp,
+ lldb::WatchpointSP wp_sp
+)
+{
+ lldb::SBFrame sb_frame(stop_frame_sp);
+ lldb::SBWatchpoint sb_wp(wp_sp);
+ int nargs = 2;
+
+ // Push the Lua wrappers
+ PushSBClass(L, &sb_frame);
+ PushSBClass(L, &sb_wp);
+
+ // Call into the Lua callback passing 'sb_frame' and 'sb_wp'.
+ // Expects a boolean return.
+ if (lua_pcall(L, nargs, 1, 0) != LUA_OK) {
+ llvm::Error E = llvm::make_error<llvm::StringError>(
+ llvm::formatv("{0}\n", lua_tostring(L, -1)),
+ llvm::inconvertibleErrorCode());
+ // Pop error message from the stack.
+ lua_pop(L, 1);
+ return std::move(E);
+ }
+
+ // Boolean return from the callback
+ bool stop = lua_toboolean(L, -1);
+ lua_pop(L, 1);
+
+ return stop;
+}
+
%}
lua_State *L, lldb::StackFrameSP stop_frame_sp,
lldb::BreakpointLocationSP bp_loc_sp, StructuredDataImpl *extra_args_impl);
+extern "C" llvm::Expected<bool> LLDBSwigLuaWatchpointCallbackFunction(
+ lua_State *L, lldb::StackFrameSP stop_frame_sp, lldb::WatchpointSP wp_sp);
+
#if _MSC_VER
#pragma warning (pop)
#endif
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 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");
CallBreakpointCallback(void *baton, lldb::StackFrameSP stop_frame_sp,
lldb::BreakpointLocationSP bp_loc_sp,
StructuredData::ObjectSP extra_args_sp);
+ llvm::Error RegisterWatchpointCallback(void *baton, const char *body);
+ llvm::Expected<bool> CallWatchpointCallback(void *baton,
+ lldb::StackFrameSP stop_frame_sp,
+ lldb::WatchpointSP wp_sp);
llvm::Error LoadModule(llvm::StringRef filename);
llvm::Error CheckSyntax(llvm::StringRef buffer);
llvm::Error ChangeIO(FILE *out, FILE *err);
const char *instructions = nullptr;
switch (m_active_io_handler) {
case eIOHandlerNone:
+ break;
case eIOHandlerWatchpoint:
+ instructions = "Enter your Lua command(s). Type 'quit' to end.\n"
+ "The commands are compiled as the body of the following "
+ "Lua function\n"
+ "function (frame, wp) end\n";
+ SetPrompt(llvm::StringRef("..> "));
break;
case eIOHandlerBreakpoint:
instructions = "Enter your Lua command(s). Type 'quit' to end.\n"
StringList &lines) override {
size_t last = lines.GetSize() - 1;
if (IsQuitCommand(lines.GetStringAtIndex(last))) {
- if (m_active_io_handler == eIOHandlerBreakpoint)
+ if (m_active_io_handler == eIOHandlerBreakpoint ||
+ m_active_io_handler == eIOHandlerWatchpoint)
lines.DeleteStringAtIndex(last);
return true;
}
// Lua always errors out to incomplete code with '<eof>'
return error_str.find("<eof>") == std::string::npos;
}
- // The breakpoint handler only exits with a explicit 'quit'
- return m_active_io_handler != eIOHandlerBreakpoint;
+ // The breakpoint and watchpoint handler only exits with a explicit 'quit'
+ return m_active_io_handler != eIOHandlerBreakpoint &&
+ m_active_io_handler != eIOHandlerWatchpoint;
}
void IOHandlerInputComplete(IOHandler &io_handler,
}
io_handler.SetIsDone(true);
} break;
- case eIOHandlerWatchpoint:
+ case eIOHandlerWatchpoint: {
+ auto *wp_options =
+ static_cast<WatchpointOptions *>(io_handler.GetUserData());
+ m_script_interpreter.SetWatchpointCommandCallback(wp_options,
+ data.c_str());
io_handler.SetIsDone(true);
- break;
+ } break;
case eIOHandlerNone:
if (IsQuitCommand(data)) {
io_handler.SetIsDone(true);
return *BoolOrErr;
}
+bool ScriptInterpreterLua::WatchpointCallbackFunction(
+ void *baton, StoppointCallbackContext *context, user_id_t watch_id) {
+ assert(context);
+
+ ExecutionContext exe_ctx(context->exe_ctx_ref);
+ Target *target = exe_ctx.GetTargetPtr();
+ if (target == nullptr)
+ return true;
+
+ StackFrameSP stop_frame_sp(exe_ctx.GetFrameSP());
+ WatchpointSP wp_sp = target->GetWatchpointList().FindByID(watch_id);
+
+ Debugger &debugger = target->GetDebugger();
+ ScriptInterpreterLua *lua_interpreter = static_cast<ScriptInterpreterLua *>(
+ debugger.GetScriptInterpreter(true, eScriptLanguageLua));
+ Lua &lua = lua_interpreter->GetLua();
+
+ llvm::Expected<bool> BoolOrErr =
+ lua.CallWatchpointCallback(baton, stop_frame_sp, wp_sp);
+ if (llvm::Error E = BoolOrErr.takeError()) {
+ debugger.GetErrorStream() << toString(std::move(E));
+ return true;
+ }
+
+ return *BoolOrErr;
+}
+
void ScriptInterpreterLua::CollectDataForBreakpointCommandCallback(
std::vector<std::reference_wrapper<BreakpointOptions>> &bp_options_vec,
CommandReturnObject &result) {
m_debugger.RunIOHandlerAsync(io_handler_sp);
}
+void ScriptInterpreterLua::CollectDataForWatchpointCommandCallback(
+ WatchpointOptions *wp_options, CommandReturnObject &result) {
+ IOHandlerSP io_handler_sp(
+ new IOHandlerLuaInterpreter(m_debugger, *this, eIOHandlerWatchpoint));
+ io_handler_sp->SetUserData(wp_options);
+ m_debugger.RunIOHandlerAsync(io_handler_sp);
+}
+
Status ScriptInterpreterLua::SetBreakpointCommandCallbackFunction(
BreakpointOptions &bp_options, const char *function_name,
StructuredData::ObjectSP extra_args_sp) {
return error;
}
+void ScriptInterpreterLua::SetWatchpointCommandCallback(
+ WatchpointOptions *wp_options, const char *command_body_text) {
+ RegisterWatchpointCallback(wp_options, command_body_text, {});
+}
+
+Status ScriptInterpreterLua::RegisterWatchpointCallback(
+ WatchpointOptions *wp_options, const char *command_body_text,
+ StructuredData::ObjectSP extra_args_sp) {
+ Status error;
+ auto data_up = std::make_unique<WatchpointOptions::CommandData>();
+ error = m_lua->RegisterWatchpointCallback(data_up.get(), command_body_text);
+ if (error.Fail())
+ return error;
+ auto baton_sp =
+ std::make_shared<WatchpointOptions::CommandBaton>(std::move(data_up));
+ wp_options->SetCallback(ScriptInterpreterLua::WatchpointCallbackFunction,
+ baton_sp);
+ return error;
+}
+
lldb::ScriptInterpreterSP
ScriptInterpreterLua::CreateInstance(Debugger &debugger) {
return std::make_shared<ScriptInterpreterLua>(debugger);
#include <vector>
+#include "lldb/Breakpoint/WatchpointOptions.h"
#include "lldb/Core/StructuredDataImpl.h"
#include "lldb/Interpreter/ScriptInterpreter.h"
#include "lldb/Utility/Status.h"
lldb::user_id_t break_id,
lldb::user_id_t break_loc_id);
+ static bool WatchpointCallbackFunction(void *baton,
+ StoppointCallbackContext *context,
+ lldb::user_id_t watch_id);
+
// PluginInterface protocol
lldb_private::ConstString GetPluginName() override;
std::vector<std::reference_wrapper<BreakpointOptions>> &bp_options_vec,
CommandReturnObject &result) override;
+ void
+ CollectDataForWatchpointCommandCallback(WatchpointOptions *wp_options,
+ CommandReturnObject &result) override;
+
Status SetBreakpointCommandCallback(BreakpointOptions &bp_options,
const char *command_body_text) override;
+ void SetWatchpointCommandCallback(WatchpointOptions *wp_options,
+ const char *command_body_text) override;
+
Status SetBreakpointCommandCallbackFunction(
BreakpointOptions &bp_options, const char *function_name,
StructuredData::ObjectSP extra_args_sp) override;
Status RegisterBreakpointCallback(BreakpointOptions &bp_options,
const char *command_body_text,
StructuredData::ObjectSP extra_args_sp);
+
+ Status RegisterWatchpointCallback(WatchpointOptions *wp_options,
+ const char *command_body_text,
+ StructuredData::ObjectSP extra_args_sp);
};
} // namespace lldb_private
# REQUIRES: lua
# XFAIL: system-netbsd
-# RUN: echo "int main() { return 0; }" | %clang_host -x c - -o %t
+# RUN: echo "int main() { int val = 1; val++; return 0; }" | %clang_host -x c - -g -o %t
# RUN: %lldb -s %s --script-language lua %t 2>&1 | FileCheck %s
b main
r
-watchpoint set expr 0x0
+watchpoint set variable val
watchpoint command add -s lua
-# CHECK: error: This script interpreter does not support watchpoint callbacks
+print("val=" .. tostring(frame:FindVariable("val"):GetValue()))
+quit
+c
+# CHECK: val=1
+# CHECK: val=2
+# CHECK: Process {{[0-9]+}} exited
+r
+watchpoint set variable val
+watchpoint modify 1 -c "(val == 1)"
+watchpoint command add -s lua
+print("conditional watchpoint")
+wp:SetEnabled(false)
+quit
+c
+# CHECK-COUNT-1: conditional watchpoint
+# CHECK-NOT: conditional watchpoint
+# CHECK: Process {{[0-9]+}} exited
+r
+watchpoint set expr 0x00
+watchpoint command add -s lua
+print("never triggers")
+quit
+c
+# CHECK-NOT: never triggers
+# CHECK: Process {{[0-9]+}} exited
return false;
}
+extern "C" llvm::Expected<bool> LLDBSwigLuaWatchpointCallbackFunction(
+ lua_State *L, lldb::StackFrameSP stop_frame_sp, lldb::WatchpointSP wp_sp) {
+ return false;
+}
+
#if _MSC_VER
#pragma warning (pop)
#endif
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