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//===-- ScriptedPythonInterface.h -------------------------------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
#ifndef LLDB_PLUGINS_SCRIPTINTERPRETER_PYTHON_SCRIPTEDPYTHONINTERFACE_H
#define LLDB_PLUGINS_SCRIPTINTERPRETER_PYTHON_SCRIPTEDPYTHONINTERFACE_H
#include "lldb/Host/Config.h"
#if LLDB_ENABLE_PYTHON
#include "lldb/Interpreter/ScriptedInterface.h"
#include "lldb/Utility/DataBufferHeap.h"
#include "PythonDataObjects.h"
#include "SWIGPythonBridge.h"
#include "ScriptInterpreterPythonImpl.h"
namespace lldb_private {
class ScriptInterpreterPythonImpl;
class ScriptedPythonInterface : virtual public ScriptedInterface {
public:
ScriptedPythonInterface(ScriptInterpreterPythonImpl &interpreter);
virtual ~ScriptedPythonInterface() = default;
protected:
template <typename T = StructuredData::ObjectSP>
T ExtractValueFromPythonObject(python::PythonObject &p, Status &error) {
return p.CreateStructuredObject();
}
template <>
Status ExtractValueFromPythonObject<Status>(python::PythonObject &p,
Status &error) {
if (lldb::SBError *sb_error = reinterpret_cast<lldb::SBError *>(
LLDBSWIGPython_CastPyObjectToSBError(p.get())))
error = m_interpreter.GetStatusFromSBError(*sb_error);
else
error.SetErrorString("Couldn't cast lldb::SBError to lldb::Status.");
return error;
}
template <>
lldb::DataExtractorSP
ExtractValueFromPythonObject<lldb::DataExtractorSP>(python::PythonObject &p,
Status &error) {
lldb::SBData *sb_data = reinterpret_cast<lldb::SBData *>(
LLDBSWIGPython_CastPyObjectToSBData(p.get()));
if (!sb_data) {
error.SetErrorString("Couldn't cast lldb::SBError to lldb::Status.");
return nullptr;
}
return m_interpreter.GetDataExtractorFromSBData(*sb_data);
}
template <typename T = StructuredData::ObjectSP, typename... Args>
T Dispatch(llvm::StringRef method_name, Status &error, Args... args) {
using namespace python;
using Locker = ScriptInterpreterPythonImpl::Locker;
auto error_with_message = [&method_name, &error](llvm::StringRef message) {
error.SetErrorStringWithFormatv(
"ScriptedPythonInterface::{0} ({1}) ERROR = {2}", __FUNCTION__,
method_name, message);
return T();
};
if (!m_object_instance_sp)
return error_with_message("Python object ill-formed");
Locker py_lock(&m_interpreter, Locker::AcquireLock | Locker::NoSTDIN,
Locker::FreeLock);
PythonObject implementor(PyRefType::Borrowed,
(PyObject *)m_object_instance_sp->GetValue());
if (!implementor.IsAllocated())
return error_with_message("Python implementor not allocated.");
PythonObject pmeth(
PyRefType::Owned,
PyObject_GetAttrString(implementor.get(), method_name.str().c_str()));
if (PyErr_Occurred())
PyErr_Clear();
if (!pmeth.IsAllocated())
return error_with_message("Python method not allocated.");
if (PyCallable_Check(pmeth.get()) == 0) {
if (PyErr_Occurred())
PyErr_Clear();
return error_with_message("Python method not callable.");
}
if (PyErr_Occurred())
PyErr_Clear();
// TODO: make `const char *` when removing support for Python 2.
char *format = nullptr;
std::string format_buffer;
if (sizeof...(Args) > 0) {
FormatArgs(format_buffer, args...);
// TODO: make `const char *` when removing support for Python 2.
format = const_cast<char *>(format_buffer.c_str());
}
// TODO: make `const char *` when removing support for Python 2.
PythonObject py_return(
PyRefType::Owned,
PyObject_CallMethod(implementor.get(),
const_cast<char *>(method_name.data()), format,
args...));
if (PyErr_Occurred()) {
PyErr_Print();
PyErr_Clear();
return error_with_message("Python method could not be called.");
}
if (!py_return.IsAllocated())
return error_with_message("Returned object is null.");
return ExtractValueFromPythonObject<T>(py_return, error);
}
Status GetStatusFromMethod(llvm::StringRef method_name);
template <typename T, typename... Args>
void FormatArgs(std::string &fmt, T arg, Args... args) const {
FormatArgs(fmt, arg);
FormatArgs(fmt, args...);
}
template <typename T> void FormatArgs(std::string &fmt, T arg) const {
fmt += GetPythonValueFormatString(arg);
}
void FormatArgs(std::string &fmt) const {}
// The lifetime is managed by the ScriptInterpreter
ScriptInterpreterPythonImpl &m_interpreter;
};
} // namespace lldb_private
#endif // LLDB_ENABLE_PYTHON
#endif // LLDB_PLUGINS_SCRIPTINTERPRETER_PYTHON_SCRIPTEDPYTHONINTERFACE_H
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