[LLDB][Telemetry]Define TargetInfo for collecting data about a target

lldb/include/lldb/Core/Telemetry.h

@@ -23,9 +23,12 @@
 #include <atomic>
 #include <chrono>
 #include <ctime>
+#include <functional>
 #include <memory>
 #include <optional>
 #include <string>
+#include <type_traits>
+#include <utility>
 
 namespace lldb_private {
 namespace telemetry {
@@ -46,12 +49,18 @@ struct LLDBConfig : public ::llvm::telemetry::Config {
 // Specifically:
 //  - Length: 8 bits
 //  - First two bits (MSB) must be 11 - the common prefix
+//  - Last two bits (LSB) are reserved for grand-children of LLDBTelemetryInfo
 // If any of the subclass has descendents, those descendents
-// must have their LLDBEntryKind in the similar form (ie., share common prefix)
+// must have their LLDBEntryKind in the similar form (ie., share common prefix
+// and differ by the last two bits)
 struct LLDBEntryKind : public ::llvm::telemetry::EntryKind {
-  static const llvm::telemetry::KindType BaseInfo = 0b11000000;
-  static const llvm::telemetry::KindType CommandInfo = 0b11010000;
-  static const llvm::telemetry::KindType DebuggerInfo = 0b11000100;
+  // clang-format off
+  static const llvm::telemetry::KindType BaseInfo        = 0b11000000;
+  static const llvm::telemetry::KindType CommandInfo     = 0b11010000;
+  static const llvm::telemetry::KindType DebuggerInfo    = 0b11001000;
+  static const llvm::telemetry::KindType ExecModuleInfo  = 0b11000100;
+  static const llvm::telemetry::KindType ProcessExitInfo = 0b11001100;
+  // clang-format on
 };
 
 /// Defines a convenient type for timestamp of various events.
@@ -146,6 +155,59 @@ struct DebuggerInfo : public LLDBBaseTelemetryInfo {
   void serialize(llvm::telemetry::Serializer &serializer) const override;
 };
 
+struct ExecModuleInfo : public LLDBBaseTelemetryInfo {
+  lldb::ModuleSP exec_mod;
+
+  /// The same as the executable-module's UUID.
+  UUID exec_uuid;
+  /// PID of the process owned by this target.
+  lldb::pid_t pid;
+  /// The triple of this executable module.
+  std::string triple;
+
+  /// If true, this entry was emitted at the beginning of an event (eg., before
+  /// the executable is set). Otherwise, it was emitted at the end of an
+  /// event (eg., after the module and any dependency were loaded.)
+  bool is_start_entry;
+
+  ExecModuleInfo() = default;
+
+  llvm::telemetry::KindType getKind() const override {
+    return LLDBEntryKind::ExecModuleInfo;
+  }
+
+  static bool classof(const TelemetryInfo *T) {
+    // Subclasses of this is also acceptable
+    return (T->getKind() & LLDBEntryKind::ExecModuleInfo) ==
+           LLDBEntryKind::ExecModuleInfo;
+  }
+  void serialize(llvm::telemetry::Serializer &serializer) const override;
+};
+
+/// Describes an exit status.
+struct ExitDescription {
+  int exit_code;
+  std::string description;
+};
+
+struct ProcessExitInfo : public LLDBBaseTelemetryInfo {
+  UUID exec_uuid;
+  lldb::pid_t pid;
+  bool is_start_entry;
+  std::optional<ExitDescription> exit_desc;
+
+  llvm::telemetry::KindType getKind() const override {
+    return LLDBEntryKind::ProcessExitInfo;
+  }
+
+  static bool classof(const TelemetryInfo *T) {
+    // Subclasses of this is also acceptable
+    return (T->getKind() & LLDBEntryKind::ProcessExitInfo) ==
+           LLDBEntryKind::ProcessExitInfo;
+  }
+  void serialize(llvm::telemetry::Serializer &serializer) const override;
+};
+
 /// The base Telemetry manager instance in LLDB.
 /// This class declares additional instrumentation points
 /// applicable to LLDB.

lldb/source/Core/Telemetry.cpp

@@ -76,15 +76,36 @@ void CommandInfo::serialize(Serializer &serializer) const {
     serializer.write("error_data", error_data.value());
 }
 
+std::atomic<uint64_t> CommandInfo::g_command_id_seed = 0;
+uint64_t CommandInfo::GetNextId() { return g_command_id_seed.fetch_add(1); }
+
 void DebuggerInfo::serialize(Serializer &serializer) const {
   LLDBBaseTelemetryInfo::serialize(serializer);
 
   serializer.write("lldb_version", lldb_version);
   serializer.write("is_exit_entry", is_exit_entry);
 }
 
-std::atomic<uint64_t> CommandInfo::g_command_id_seed = 0;
-uint64_t CommandInfo::GetNextId() { return g_command_id_seed.fetch_add(1); }
+void ExecModuleInfo::serialize(Serializer &serializer) const {
+  LLDBBaseTelemetryInfo::serialize(serializer);
+
+  serializer.write("exec_uuid", exec_uuid.GetAsString());
+  serializer.write("pid", pid);
+  serializer.write("triple", triple);
+  serializer.write("is_start_entry", is_start_entry);
+}
+
+void ProcessExitInfo::serialize(Serializer &serializer) const {
+  LLDBBaseTelemetryInfo::serialize(serializer);
+
+  serializer.write("exec_uuid", exec_uuid.GetAsString());
+  serializer.write("pid", pid);
+  serializer.write("is_start_entry", is_start_entry);
+  if (exit_desc.has_value()) {
+    serializer.write("exit_code", exit_desc->exit_code);
+    serializer.write("exit_desc", exit_desc->description);
+  }
+}
 
 TelemetryManager::TelemetryManager(std::unique_ptr<LLDBConfig> config)
     : m_config(std::move(config)), m_id(MakeUUID()) {}

lldb/source/Target/Process.cpp

@@ -22,6 +22,7 @@
 #include "lldb/Core/ModuleSpec.h"
 #include "lldb/Core/PluginManager.h"
 #include "lldb/Core/Progress.h"
+#include "lldb/Core/Telemetry.h"
 #include "lldb/Expression/DiagnosticManager.h"
 #include "lldb/Expression/DynamicCheckerFunctions.h"
 #include "lldb/Expression/UserExpression.h"
@@ -1066,6 +1067,26 @@ const char *Process::GetExitDescription() {
 bool Process::SetExitStatus(int status, llvm::StringRef exit_string) {
   // Use a mutex to protect setting the exit status.
   std::lock_guard<std::mutex> guard(m_exit_status_mutex);
+  telemetry::ScopedDispatcher<telemetry::ProcessExitInfo> helper;
+
+  // Find the executable-module's UUID, if available.
+  Target &target = GetTarget();
+  helper.SetDebugger(&(target.GetDebugger()));
+  UUID exec_uuid;
+  if (ModuleSP exec_mod = target.GetExecutableModule())
+    exec_uuid = exec_mod->GetUUID();
+
+  helper.DispatchNow([&](telemetry::ProcessExitInfo *info) {
+    info->exec_uuid = exec_uuid;
+    info->pid = m_pid;
+    info->is_start_entry = true;
+    info->exit_desc = {status, exit_string.str()};
+  });
+
+  helper.DispatchOnExit([&](telemetry::ProcessExitInfo *info) {
+    info->exec_uuid = exec_uuid;
+    info->pid = m_pid;
+  });
 
   Log *log(GetLog(LLDBLog::State | LLDBLog::Process));
   LLDB_LOG(log, "(plugin = {0} status = {1} ({1:x8}), description=\"{2}\")",

lldb/source/Target/Target.cpp

@@ -24,6 +24,7 @@
 #include "lldb/Core/Section.h"
 #include "lldb/Core/SourceManager.h"
 #include "lldb/Core/StructuredDataImpl.h"
+#include "lldb/Core/Telemetry.h"
 #include "lldb/DataFormatters/FormatterSection.h"
 #include "lldb/Expression/DiagnosticManager.h"
 #include "lldb/Expression/ExpressionVariable.h"
@@ -1559,10 +1560,29 @@ void Target::DidExec() {
 
 void Target::SetExecutableModule(ModuleSP &executable_sp,
                                  LoadDependentFiles load_dependent_files) {
+  telemetry::ScopedDispatcher<telemetry::ExecModuleInfo> helper(&m_debugger);
   Log *log = GetLog(LLDBLog::Target);
   ClearModules(false);
 
   if (executable_sp) {
+    lldb::pid_t pid;
+    if (ProcessSP proc = GetProcessSP())
+      pid = proc->GetID();
+
+    helper.DispatchNow([&](telemetry::ExecModuleInfo *info) {
+      info->exec_mod = executable_sp;
+      info->exec_uuid = executable_sp->GetUUID();
+      info->pid = pid;
+      info->triple = executable_sp->GetArchitecture().GetTriple().getTriple();
+      info->is_start_entry = true;
+    });
+
+    helper.DispatchOnExit([&](telemetry::ExecModuleInfo *info) {
+      info->exec_mod = executable_sp;
+      info->exec_uuid = executable_sp->GetUUID();
+      info->pid = pid;
+    });
+
     ElapsedTime elapsed(m_stats.GetCreateTime());
     LLDB_SCOPED_TIMERF("Target::SetExecutableModule (executable = '%s')",
                        executable_sp->GetFileSpec().GetPath().c_str());