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#include <torch/csrc/python_headers.h>
#include <torch/csrc/jit/frontend/tracer.h>
#include <torch/csrc/jit/passes/dead_code_elimination.h>
#include <torch/csrc/jit/passes/inliner.h>
#include <torch/csrc/jit/passes/lower_tuples.h>
#include <torch/csrc/jit/python/pybind.h>
#include <torch/csrc/jit/python/python_tracer.h>
#include <torch/csrc/jit/serialization/export.h>
#include <torch/csrc/utils/python_strings.h>
#include <c10/util/Exception.h>
#include <c10/util/irange.h>
#include <sstream>
using namespace torch::autograd;
using namespace torch::jit;
using namespace torch::jit::tracer;
namespace torch {
namespace jit {
namespace tracer {
// Python interpreter retrieval routine adapted from
// https://stackoverflow.com/a/8706144
std::vector<StackEntry> _pythonCallstack() {
pybind11::gil_scoped_acquire gil;
PyFrameObject* frame = PyEval_GetFrame();
Py_XINCREF(frame);
std::vector<StackEntry> entries;
while (nullptr != frame) {
auto code = THPCodeObjectPtr(PyFrame_GetCode(frame));
size_t line = PyCode_Addr2Line(code.get(), PyFrame_GetLasti(frame));
std::string filename = THPUtils_unpackString(code->co_filename);
std::string funcname = THPUtils_unpackString(code->co_name);
auto source = std::make_shared<Source>(funcname, filename, line);
entries.emplace_back(
StackEntry{funcname, SourceRange(source, 0, funcname.size())});
auto new_frame = PyFrame_GetBack(frame);
Py_DECREF(frame);
frame = new_frame;
}
return entries;
}
SourceRange getPythonInterpreterSourceRange() {
auto cs = pythonCallstack();
c10::optional<std::string> source_filename;
size_t source_line = 0;
std::stringstream stack_trace;
for (const auto& entry : cs) {
auto& range = entry.range;
if (range.source()) {
auto& src = range.source();
if (src && src->filename()) {
auto line =
src->starting_line_no() + src->lineno_for_offset(range.start());
stack_trace << *(src->filename()) << "(" << line
<< "): " << entry.filename << "\n";
if (!source_filename) {
source_filename = *(src->filename());
source_line = line;
}
}
}
}
auto stack_trace_text = stack_trace.str();
auto source =
std::make_shared<Source>(stack_trace_text, source_filename, source_line);
return SourceRange(source, 0, stack_trace_text.size());
}
std::pair<std::shared_ptr<Graph>, Stack> createGraphByTracing(
const py::function& func,
Stack trace_inputs,
const py::function& var_name_lookup_fn,
bool strict,
bool force_outplace,
Module* self,
const std::vector<std::string>& argument_names) {
C10_LOG_API_USAGE_ONCE("torch.tracer");
auto lookup_fn_adapter =
[var_name_lookup_fn](const Variable& var) -> std::string {
pybind11::gil_scoped_acquire ag;
return py::cast<std::string>(var_name_lookup_fn(var));
};
auto outs = tracer::trace(
std::move(trace_inputs),
[&func](Stack inputs) -> Stack {
size_t num_func_inputs = inputs.size();
py::tuple py_inputs(num_func_inputs);
for (const auto i : c10::irange(num_func_inputs)) {
py_inputs[i] = py::cast(inputs[i]);
}
auto out = func(*py_inputs);
if (out.ptr() == Py_None) {
AT_ERROR(
"The traced function didn't return any values! Side-effects are not "
"captured in traces, so it would be a no-op.");
}
return {toTypeInferredIValue(out)};
},
lookup_fn_adapter,
strict,
force_outplace,
self,
argument_names);
return std::make_pair(std::get<0>(outs)->graph, std::get<1>(outs));
}
Node* preRecordPythonTrace(
THPObjectPtr pyobj,
const std::string& arg_types,
at::ArrayRef<Variable> inputs,
pyobj_list scalar_args) {
THPObjectPtr apply(PyObject_GetAttrString(pyobj.get(), "apply"));
if (!apply) {
throw python_error();
}
auto& graph = getTracingState()->graph;
Node* n = graph->createPythonOp(
std::move(apply), arg_types, std::move(scalar_args));
recordSourceLocation(n);
for (const Variable& input : inputs) {
n->addInput(getValueTrace(input));
}
graph->insertNode(n);
return n;
}
void pythonRecordSourceLocation(Node* n) {
n->setSourceRange(getPythonInterpreterSourceRange());
}
void pythonWarn(const std::string& reason) {
pybind11::gil_scoped_acquire gil;
auto warn_class = py::module::import("torch.jit").attr("TracerWarning");
PyErr_WarnEx(warn_class.ptr(), reason.c_str(), 1);
}
void initPythonTracerBindings(PyObject* module) {
setPythonCallstack(_pythonCallstack);
setRecordSourceLocation(pythonRecordSourceLocation);
auto m = py::handle(module).cast<py::module>();
py::class_<TracingState, std::shared_ptr<TracingState>>(
m, "TracingState", py::dynamic_attr())
// NB: no constructor; you have to get it from C++ code
.def(
"__repr__",
[](const TracingState& s) {
std::ostringstream ss;
ss << "<TracingState " << (const void*)&s << ">";
return ss.str();
})
.def(
"__str__",
[](const TracingState& s) -> std::string {
std::ostringstream ss;
ss << *s.graph;
return ss.str();
})
.def(
"push_scope",
[](TracingState& s, const std::string& scope_name) {
s.graph->push_scope(scope_name);
})
.def("pop_scope", [](TracingState& s) { s.graph->pop_scope(); })
.def(
"current_scope",
[](TracingState& s) {
return s.graph->current_scope()->name().toUnqualString();
})
.def(
"set_graph",
[](TracingState& s, std::shared_ptr<Graph> g) {
s.graph = std::move(g);
})
.def("graph", [](TracingState& s) { return s.graph; });
m.def("_tracer_warn_use_python", []() { tracer::setWarn(pythonWarn); });
m.def(
"_create_graph_by_tracing",
createGraphByTracing,
py::arg("func"),
py::arg("inputs"),
py::arg("var_name_lookup_fn"),
py::arg("strict"),
py::arg("force_outplace"),
py::arg("self") = nullptr,
py::arg("argument_names") = std::vector<std::string>());
m.def("_get_tracing_state", []() { return getTracingState(); });
m.def("_set_tracing_state", [](std::shared_ptr<TracingState> state) {
return setTracingState(std::move(state));
});
m.def("_get_value_trace", [](const Variable& var) {
return getValueTrace(var);
});
m.def("_set_value_trace", [](const Variable& var, Value* value) {
return setValueTrace(var, value);
});
m.def("_tracer_set_get_unique_name_fn", [](const py::function& func) {
const auto& tracing_state = getTracingState();
AT_ASSERT(tracing_state);
tracing_state->lookup_var_name_fn =
[func](const Variable& var) -> std::string {
pybind11::gil_scoped_acquire ag;
return py::cast<std::string>(func(var));
};
});
m.def("_tracer_set_force_outplace", [](bool force_outplace) {
const auto& tracing_state = getTracingState();
AT_ASSERT(tracing_state);
tracing_state->force_outplace = force_outplace;
});
}
} // namespace tracer
} // namespace jit
} // namespace torch
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