Fix an incorrect assumption in "thread until": code with debug info is not always in a function.

Some dyld cross library stubs can have line information but no function.  Make sure you
check that you have a valid Function object before asking it questions.

Differential Revision: https://reviews.llvm.org/D119297

1 files changed, 8 insertions, 1 deletions

diff --git a/lldb/source/Commands/CommandObjectThread.cpp b/lldb/source/Commands/CommandObjectThread.cpp
index 4108adf..bd491e5 100644
--- a/lldb/source/Commands/CommandObjectThread.cpp
+++ b/lldb/source/Commands/CommandObjectThread.cpp
@@ -1012,7 +1012,14 @@ protected:
         uint32_t index_ptr = 0, end_ptr;
         std::vector<addr_t> address_list;
 
-        // Find the beginning & end index of the        
+        // Find the beginning & end index of the function, but first make
+        // sure it is valid:
+        if (!sc.function) {
+          result.AppendErrorWithFormat("Have debug information but no "
+                                       "function info - can't get until range.");
+          return false;
+        }
+
         AddressRange fun_addr_range = sc.function->GetAddressRange();
         Address fun_start_addr = fun_addr_range.GetBaseAddress();
         line_table->FindLineEntryByAddress(fun_start_addr, function_start,