[Reproducer] Don't isntrument methods that get called from the signal handler.

LLDB's signal handlers call SBDebugger methods, which themselves try to
be really careful about not doing anything non-signal safe. The
Reproducer record macro is not careful though, and does unsafe things
which potentially caused LLDB to crash. Given that these methods are not
particularly interesting I've swapped the RECORD macros with DUMMY ones,
so that we still register the API boundary but don't do anything
non-signal safe.

Thanks Jim for figuring this one out!

llvm-svn: 374104
(cherry picked from commit b328dcb)

Author: JDevlieghere

lldb/include/lldb/Utility/ReproducerInstrumentation.h

@@ -175,6 +175,8 @@ template <typename... Ts> inline std::string stringify_args(const Ts &... ts) {
 #define LLDB_RECORD_DUMMY(Result, Class, Method, Signature, ...)               \
   lldb_private::repro::Recorder sb_recorder(LLVM_PRETTY_FUNCTION,              \
                                             stringify_args(__VA_ARGS__));
+#define LLDB_RECORD_DUMMY_NO_ARGS(Result, Class, Method)                       \
+  lldb_private::repro::Recorder sb_recorder(LLVM_PRETTY_FUNCTION);
 
 namespace lldb_private {
 namespace repro {

lldb/source/API/SBDebugger.cpp

@@ -365,14 +365,14 @@ FILE *SBDebugger::GetErrorFileHandle() {
 }
 
 void SBDebugger::SaveInputTerminalState() {
-  LLDB_RECORD_METHOD_NO_ARGS(void, SBDebugger, SaveInputTerminalState);
+  LLDB_RECORD_DUMMY_NO_ARGS(void, SBDebugger, SaveInputTerminalState);
 
   if (m_opaque_sp)
     m_opaque_sp->SaveInputTerminalState();
 }
 
 void SBDebugger::RestoreInputTerminalState() {
-  LLDB_RECORD_METHOD_NO_ARGS(void, SBDebugger, RestoreInputTerminalState);
+  LLDB_RECORD_DUMMY_NO_ARGS(void, SBDebugger, RestoreInputTerminalState);
 
   if (m_opaque_sp)
     m_opaque_sp->RestoreInputTerminalState();
@@ -1033,7 +1033,7 @@ void SBDebugger::DispatchInput(const void *data, size_t data_len) {
 }
 
 void SBDebugger::DispatchInputInterrupt() {
-  LLDB_RECORD_METHOD_NO_ARGS(void, SBDebugger, DispatchInputInterrupt);
+  LLDB_RECORD_DUMMY_NO_ARGS(void, SBDebugger, DispatchInputInterrupt);
 
   if (m_opaque_sp)
     m_opaque_sp->DispatchInputInterrupt();
@@ -1193,8 +1193,7 @@ uint32_t SBDebugger::GetTerminalWidth() const {
 }
 
 void SBDebugger::SetTerminalWidth(uint32_t term_width) {
-  LLDB_RECORD_METHOD(void, SBDebugger, SetTerminalWidth, (uint32_t),
-                     term_width);
+  LLDB_RECORD_DUMMY(void, SBDebugger, SetTerminalWidth, (uint32_t), term_width);
 
   if (m_opaque_sp)
     m_opaque_sp->SetTerminalWidth(term_width);