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//===-- Trace.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 "lldb/Target/Trace.h"
#include "llvm/Support/Format.h"
#include "lldb/Core/Module.h"
#include "lldb/Core/PluginManager.h"
#include "lldb/Symbol/Function.h"
#include "lldb/Target/ExecutionContext.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/SectionLoadList.h"
#include "lldb/Target/Thread.h"
#include "lldb/Utility/Stream.h"
using namespace lldb;
using namespace lldb_private;
using namespace llvm;
// Helper structs used to extract the type of a trace session json without
// having to parse the entire object.
struct JSONSimplePluginSettings {
std::string type;
};
struct JSONSimpleTraceSession {
JSONSimplePluginSettings trace;
};
namespace llvm {
namespace json {
bool fromJSON(const Value &value, JSONSimplePluginSettings &plugin_settings,
Path path) {
json::ObjectMapper o(value, path);
return o && o.map("type", plugin_settings.type);
}
bool fromJSON(const Value &value, JSONSimpleTraceSession &session, Path path) {
json::ObjectMapper o(value, path);
return o && o.map("trace", session.trace);
}
} // namespace json
} // namespace llvm
static Error createInvalidPlugInError(StringRef plugin_name) {
return createStringError(
std::errc::invalid_argument,
"no trace plug-in matches the specified type: \"%s\"",
plugin_name.data());
}
Expected<lldb::TraceSP>
Trace::FindPluginForPostMortemProcess(Debugger &debugger,
const json::Value &trace_session_file,
StringRef session_file_dir) {
JSONSimpleTraceSession json_session;
json::Path::Root root("traceSession");
if (!json::fromJSON(trace_session_file, json_session, root))
return root.getError();
ConstString plugin_name(json_session.trace.type);
if (auto create_callback = PluginManager::GetTraceCreateCallback(plugin_name))
return create_callback(trace_session_file, session_file_dir, debugger);
return createInvalidPlugInError(json_session.trace.type);
}
Expected<lldb::TraceSP>
Trace::FindPluginForLiveProcess(llvm::StringRef plugin_name, Process &process) {
if (!process.IsLiveDebugSession())
return createStringError(inconvertibleErrorCode(),
"Can't trace non-live processes");
ConstString name(plugin_name);
if (auto create_callback =
PluginManager::GetTraceCreateCallbackForLiveProcess(name))
return create_callback(process);
return createInvalidPlugInError(plugin_name);
}
Expected<StringRef> Trace::FindPluginSchema(StringRef name) {
ConstString plugin_name(name);
StringRef schema = PluginManager::GetTraceSchema(plugin_name);
if (!schema.empty())
return schema;
return createInvalidPlugInError(name);
}
Error Trace::Start(const llvm::json::Value &request) {
if (!m_live_process)
return createStringError(inconvertibleErrorCode(),
"Tracing requires a live process.");
return m_live_process->TraceStart(request);
}
Error Trace::Stop() {
if (!m_live_process)
return createStringError(inconvertibleErrorCode(),
"Tracing requires a live process.");
return m_live_process->TraceStop(
TraceStopRequest(GetPluginName().AsCString()));
}
Error Trace::Stop(llvm::ArrayRef<lldb::tid_t> tids) {
if (!m_live_process)
return createStringError(inconvertibleErrorCode(),
"Tracing requires a live process.");
return m_live_process->TraceStop(
TraceStopRequest(GetPluginName().AsCString(), tids));
}
Expected<std::string> Trace::GetLiveProcessState() {
if (!m_live_process)
return createStringError(inconvertibleErrorCode(),
"Tracing requires a live process.");
return m_live_process->TraceGetState(GetPluginName().AsCString());
}
Optional<size_t> Trace::GetLiveThreadBinaryDataSize(lldb::tid_t tid,
llvm::StringRef kind) {
auto it = m_live_thread_data.find(tid);
if (it == m_live_thread_data.end())
return None;
std::unordered_map<std::string, size_t> &single_thread_data = it->second;
auto single_thread_data_it = single_thread_data.find(kind.str());
if (single_thread_data_it == single_thread_data.end())
return None;
return single_thread_data_it->second;
}
Optional<size_t> Trace::GetLiveProcessBinaryDataSize(llvm::StringRef kind) {
auto data_it = m_live_process_data.find(kind.str());
if (data_it == m_live_process_data.end())
return None;
return data_it->second;
}
Expected<ArrayRef<uint8_t>>
Trace::GetLiveThreadBinaryData(lldb::tid_t tid, llvm::StringRef kind) {
if (!m_live_process)
return createStringError(inconvertibleErrorCode(),
"Tracing requires a live process.");
llvm::Optional<size_t> size = GetLiveThreadBinaryDataSize(tid, kind);
if (!size)
return createStringError(
inconvertibleErrorCode(),
"Tracing data \"%s\" is not available for thread %" PRIu64 ".",
kind.data(), tid);
TraceGetBinaryDataRequest request{GetPluginName().AsCString(), kind.str(),
static_cast<int64_t>(tid), 0,
static_cast<int64_t>(*size)};
return m_live_process->TraceGetBinaryData(request);
}
Expected<ArrayRef<uint8_t>>
Trace::GetLiveProcessBinaryData(llvm::StringRef kind) {
if (!m_live_process)
return createStringError(inconvertibleErrorCode(),
"Tracing requires a live process.");
llvm::Optional<size_t> size = GetLiveProcessBinaryDataSize(kind);
if (!size)
return createStringError(
inconvertibleErrorCode(),
"Tracing data \"%s\" is not available for the process.", kind.data());
TraceGetBinaryDataRequest request{GetPluginName().AsCString(), kind.str(),
None, 0, static_cast<int64_t>(*size)};
return m_live_process->TraceGetBinaryData(request);
}
void Trace::RefreshLiveProcessState() {
if (!m_live_process)
return;
uint32_t new_stop_id = m_live_process->GetStopID();
if (new_stop_id == m_stop_id)
return;
m_stop_id = new_stop_id;
m_live_thread_data.clear();
Expected<std::string> json_string = GetLiveProcessState();
if (!json_string) {
DoRefreshLiveProcessState(json_string.takeError());
return;
}
Expected<TraceGetStateResponse> live_process_state =
json::parse<TraceGetStateResponse>(*json_string, "TraceGetStateResponse");
if (!live_process_state) {
DoRefreshLiveProcessState(live_process_state.takeError());
return;
}
for (const TraceThreadState &thread_state :
live_process_state->tracedThreads) {
for (const TraceBinaryData &item : thread_state.binaryData)
m_live_thread_data[thread_state.tid][item.kind] = item.size;
}
for (const TraceBinaryData &item : live_process_state->processBinaryData)
m_live_process_data[item.kind] = item.size;
DoRefreshLiveProcessState(std::move(live_process_state));
}
uint32_t Trace::GetStopID() {
RefreshLiveProcessState();
return m_stop_id;
}
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