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thread_builder.cpp
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193 lines (157 loc) · 5.62 KB
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#include "thread_builder.h"
#include "logging.h"
#include "maps_parser.h"
namespace pystack {
// StackMethod flags (must match Python enum values)
enum StackMethodFlag {
METHOD_ELF_DATA = 1 << 0,
METHOD_SYMBOLS = 1 << 1,
METHOD_BSS = 1 << 2,
METHOD_ANONYMOUS_MAPS = 1 << 3,
METHOD_HEAP = 1 << 4,
METHOD_DEBUG_OFFSETS = 1 << 5,
};
std::vector<PyFrameData>
buildFrameStack(FrameObject* first_frame, bool resolve_locals)
{
std::vector<PyFrameData> frames;
FrameObject* current_frame = first_frame;
while (current_frame != nullptr) {
auto code = current_frame->Code();
// Skip frames without code (shim frames) or with unreadable code ("???")
if (!code || code->Filename() == "???") {
auto prev = current_frame->PreviousFrame();
current_frame = prev.get();
continue;
}
if (resolve_locals) {
current_frame->resolveLocalVariables();
}
PyFrameData frame_data;
frame_data.code.filename = code->Filename();
frame_data.code.scope = code->Scope();
frame_data.code.location = code->Location();
frame_data.arguments = current_frame->Arguments();
frame_data.locals = current_frame->Locals();
frame_data.is_entry = current_frame->IsEntryFrame();
frame_data.is_shim = current_frame->IsShim();
frames.push_back(std::move(frame_data));
auto prev = current_frame->PreviousFrame();
current_frame = prev.get();
}
return frames;
}
PyThreadData
buildPythonThread(
const std::shared_ptr<AbstractProcessManager>& manager,
PyThread* thread,
pid_t pid,
bool add_native_traces,
bool resolve_locals)
{
PyThreadData data;
data.tid = thread->Tid();
data.name = getThreadName(pid, thread->Tid());
LOG(INFO) << "Constructing new Python thread with tid " << data.tid;
if (add_native_traces) {
thread->populateNativeStackTrace(manager);
}
auto first_frame = thread->FirstFrame();
if (first_frame) {
data.frames = buildFrameStack(first_frame.get(), resolve_locals);
}
const auto& native_frames = thread->NativeFrames();
data.native_frames.assign(native_frames.rbegin(), native_frames.rend());
data.gil_status = static_cast<int>(thread->isGilHolder());
data.gc_status = static_cast<int>(thread->isGCCollecting());
return data;
}
PyThreadData
buildNativeThread(const std::shared_ptr<AbstractProcessManager>& manager, pid_t pid, pid_t tid)
{
PyThreadData data;
data.tid = tid;
data.name = getThreadName(pid, tid);
data.gil_status = 0; // NOT_HELD
data.gc_status = 0; // NOT_COLLECTING
LOG(INFO) << "Constructing new native thread with tid " << tid;
Thread native_thread(pid, tid);
native_thread.populateNativeStackTrace(manager);
const auto& native_frames = native_thread.NativeFrames();
data.native_frames.assign(native_frames.rbegin(), native_frames.rend());
return data;
}
std::vector<PyThreadData>
buildThreadsFromInterpreter(
const std::shared_ptr<AbstractProcessManager>& manager,
remote_addr_t interpreter_head,
pid_t pid,
bool add_native_traces,
bool resolve_locals)
{
LOG(INFO) << "Fetching Python threads";
std::vector<PyThreadData> threads;
auto thread = getThreadFromInterpreterState(manager, interpreter_head);
PyThread* current_thread = thread.get();
while (current_thread != nullptr) {
threads.push_back(
buildPythonThread(manager, current_thread, pid, add_native_traces, resolve_locals));
auto next = current_thread->NextThread();
current_thread = next.get();
}
return threads;
}
remote_addr_t
getInterpreterStateAddr(AbstractProcessManager* manager, int method_flags)
{
remote_addr_t head = 0;
struct MethodInfo
{
int flag;
const char* name;
std::function<remote_addr_t()> func;
};
std::vector<MethodInfo> methods = {
{METHOD_DEBUG_OFFSETS,
"using debug offsets data",
[&]() { return manager->findInterpreterStateFromDebugOffsets(); }},
{METHOD_ELF_DATA,
"using ELF data",
[&]() { return manager->findInterpreterStateFromElfData(); }},
{METHOD_SYMBOLS,
"using symbols",
[&]() { return manager->findInterpreterStateFromSymbols(); }},
{METHOD_BSS, "scanning the BSS", [&]() { return manager->scanBSS(); }},
{METHOD_ANONYMOUS_MAPS,
"scanning all anonymous maps",
[&]() { return manager->scanAllAnonymousMaps(); }},
{METHOD_HEAP, "scanning the heap", [&]() { return manager->scanHeap(); }},
};
for (const auto& method : methods) {
if ((method_flags & method.flag) == 0) {
continue;
}
try {
head = method.func();
} catch (const std::exception& exc) {
LOG(WARNING) << "Unexpected error finding PyInterpreterState by " << method.name << ": "
<< exc.what();
continue;
}
if (head != 0) {
LOG(INFO) << "PyInterpreterState found by " << method.name << " at address 0x" << std::hex
<< head << std::dec;
return head;
} else {
LOG(INFO) << "Address of PyInterpreterState not found by " << method.name;
}
}
LOG(INFO) << "Address of PyInterpreterState could not be found";
return 0;
}
std::vector<int>
getThreadIds(const std::shared_ptr<AbstractProcessManager>& manager)
{
return manager->Tids();
}
} // namespace pystack