[lldb] print a notice when source list paging reaches the end of the file

Author: hapeeeeee

lldb/source/Core/SourceManager.cpp

@@ -360,8 +360,11 @@ size_t SourceManager::DisplayMoreWithLineNumbers(
     GetDefaultFileAndLine();
 
   if (last_file_sp) {
-    if (m_last_line == UINT32_MAX)
-      return 0;
+    if (m_last_line == UINT32_MAX) {
+      Stream::ByteDelta delta(*s);
+      s->Printf("note: reached the end of current file, no more to page\n");
+      return *delta;
+    }
 
     if (reverse && m_last_line == 1)
       return 0;

lldb/test/Shell/Commands/command-list-reach-end-of-file.test

@@ -0,0 +1,16 @@
+# RUN: %clang_host -g -O0 %S/Inputs/sigchld.c -o %t.out
+# RUN: %lldb %t.out -b -s %s | FileCheck %s
+
+b main
+r
+list
+# CHECK: assert (child_pid != -1);
+
+list
+# CHECK: printf("signo = %d\n", SIGCHLD);
+
+list 
+# CHECK: return 0;
+
+list 
+# CHECK: note: reached the end of current file, no more to page