friss created this revision.
friss added reviewers: JDevlieghere, labath, mib.
Herald added a project: LLDB.
This gets rid of some nesting and of the raw char* variable that caused
the memory management bug Ismail hit yesterday.
Repository:
rG LLVM Github Monorepo
https://reviews.llvm.org/D74157
Files:
lldb/source/API/SBThread.cpp
Index: lldb/source/API/SBThread.cpp
===================================================================
--- lldb/source/API/SBThread.cpp
+++ lldb/source/API/SBThread.cpp
@@ -319,97 +319,72 @@
std::unique_lock<std::recursive_mutex> lock;
ExecutionContext exe_ctx(m_opaque_sp.get(), lock);
- if (exe_ctx.HasThreadScope()) {
- Process::StopLocker stop_locker;
- if (stop_locker.TryLock(&exe_ctx.GetProcessPtr()->GetRunLock())) {
+ if (dst)
+ *dst = 0;
- StopInfoSP stop_info_sp = exe_ctx.GetThreadPtr()->GetStopInfo();
- if (stop_info_sp) {
- std::string thread_stop_desc =
- exe_ctx.GetThreadPtr()->GetStopDescription();
- const char *stop_desc = thread_stop_desc.c_str();
-
- if (stop_desc[0] != '\0') {
- if (dst)
- return ::snprintf(dst, dst_len, "%s", stop_desc);
- else {
- // NULL dst passed in, return the length needed to contain the
- // description
- return ::strlen(stop_desc) + 1; // Include the NULL byte for size
- }
- } else {
- size_t stop_desc_len = 0;
- switch (stop_info_sp->GetStopReason()) {
- case eStopReasonTrace:
- case eStopReasonPlanComplete: {
- static char trace_desc[] = "step";
- stop_desc = trace_desc;
- stop_desc_len =
- sizeof(trace_desc); // Include the NULL byte for size
- } break;
-
- case eStopReasonBreakpoint: {
- static char bp_desc[] = "breakpoint hit";
- stop_desc = bp_desc;
- stop_desc_len = sizeof(bp_desc); // Include the NULL byte for size
- } break;
-
- case eStopReasonWatchpoint: {
- static char wp_desc[] = "watchpoint hit";
- stop_desc = wp_desc;
- stop_desc_len = sizeof(wp_desc); // Include the NULL byte for size
- } break;
-
- case eStopReasonSignal: {
- stop_desc =
- exe_ctx.GetProcessPtr()->GetUnixSignals()->GetSignalAsCString(
- stop_info_sp->GetValue());
- if (stop_desc == nullptr || stop_desc[0] == '\0') {
- static char signal_desc[] = "signal";
- stop_desc = signal_desc;
- stop_desc_len =
- sizeof(signal_desc); // Include the NULL byte for size
- }
- } break;
-
- case eStopReasonException: {
- char exc_desc[] = "exception";
- stop_desc = exc_desc;
- stop_desc_len = sizeof(exc_desc); // Include the NULL byte for size
- } break;
-
- case eStopReasonExec: {
- char exc_desc[] = "exec";
- stop_desc = exc_desc;
- stop_desc_len = sizeof(exc_desc); // Include the NULL byte for size
- } break;
-
- case eStopReasonThreadExiting: {
- char limbo_desc[] = "thread exiting";
- stop_desc = limbo_desc;
- stop_desc_len = sizeof(limbo_desc);
- } break;
- default:
- break;
- }
+ if (!exe_ctx.HasThreadScope())
+ return 0;
- if (stop_desc && stop_desc[0]) {
- if (dst)
- return ::snprintf(dst, dst_len, "%s", stop_desc) +
- 1; // Include the NULL byte
+ Process::StopLocker stop_locker;
+ if (!stop_locker.TryLock(&exe_ctx.GetProcessPtr()->GetRunLock()))
+ return 0;
- if (stop_desc_len == 0)
- stop_desc_len = ::strlen(stop_desc) + 1; // Include the NULL byte
+ StopInfoSP stop_info_sp = exe_ctx.GetThreadPtr()->GetStopInfo();
+ if (!stop_info_sp)
+ return 0;
- return stop_desc_len;
- }
- }
- }
- }
+ std::string thread_stop_desc = exe_ctx.GetThreadPtr()->GetStopDescription();
+ if (!thread_stop_desc.empty()) {
+ if (dst)
+ return ::snprintf(dst, dst_len, "%s", thread_stop_desc.c_str());
+
+ // NULL dst passed in, return the length needed to contain the
+ // description
+ return thread_stop_desc.size() + 1; // Include the NULL byte for size
}
+
+ // No stop description was provided by the thread's StopInfo, try to
+ // derive a meaningful description from the StopReason.
+
+ auto reason_string = [](StopReason reason) -> llvm::StringRef {
+ switch (reason) {
+ case eStopReasonTrace:
+ case eStopReasonPlanComplete:
+ return "step";
+ case eStopReasonBreakpoint:
+ return "breakpoint hit";
+ case eStopReasonWatchpoint:
+ return "watchpoint hit";
+ case eStopReasonSignal:
+ return "signal";
+ case eStopReasonException:
+ return "exception";
+ case eStopReasonExec:
+ return "exec";
+ case eStopReasonThreadExiting:
+ return "thread exiting";
+ default:
+ return {};
+ }
+ };
+
+ StopReason reason = stop_info_sp->GetStopReason();
+ llvm::StringRef stop_desc = reason_string(reason);
+
+ if (reason == eStopReasonSignal)
+ if (const char *signal_name =
+ exe_ctx.GetProcessPtr()->GetUnixSignals()->GetSignalAsCString(
+ stop_info_sp->GetValue()))
+ stop_desc = signal_name;
+
+ if (stop_desc.empty())
+ return 0;
+
if (dst)
- *dst = 0;
- return 0;
+ return ::snprintf(dst, dst_len, "%s", stop_desc.data()) +
+ 1; // Include the NULL byte
+
+ return stop_desc.size() + 1; // Include the NULL byte
}
SBValue SBThread::GetStopReturnValue() {
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