PR 5709

* main.cxx: Add pass 4.5: make uprobes.ko in runtime/uprobes
* buildrun.cxx: Add uprobes_enabled() and make_uprobes().
Factor run_make_cmd() out of compile_pass().
* buildrun.h: Add uprobes_enabled and make_uprobes decls.
* tapsets.cxx: Do correct #include for modprobed uprobes.ko;
set need_uprobes in pass 2.
* session.h: Add need_uprobes

* runtime/staprun/common.c: Add -u option -> need_uprobes
* runtime/staprun/staprun_funcs.c: Generalize insert_module()
to support inserting uprobes.ko.
* runtime/staprun/staprun.c: Add enable_uprobes().  insert_module
call becomes insert_stap_module().
* runtime/staprun/staprun.h: Reflect insert_module() and
need_uprobes changes

* runtime/uprobes/*.[c,h]: uprobes is built as a module,
rather than included into the source of the stap-generated
module.
* runtime/uprobes/Makefile: Added

1 files changed, 20 insertions, 6 deletions

diff --git a/main.cxx b/main.cxx
index 7d4b8133..97f089a8 100644
--- a/main.cxx
+++ b/main.cxx
@@ -225,6 +225,7 @@ main (int argc, char * const argv [])
   s.symtab = false;
   s.use_cache = true;
   s.tapset_compile_coverage = false;
+  s.need_uprobes = false;
 
   const char* s_p = getenv ("SYSTEMTAP_TAPSET");
   if (s_p != NULL)  
@@ -728,12 +729,13 @@ main (int argc, char * const argv [])
       // See if we can use cached source/module.
       if (get_from_cache(s))
         {
-	  // If our last pass isn't 5, we're done (since passes 3 and
-	  // 4 just generate what we just pulled out of the cache).
-	  if (s.last_pass < 5) goto cleanup;
+	  // If our last pass isn't 5, and we don't need to build
+	  // uprobes, we're done (since passes 3 and 4 just generate
+	  // what we just pulled out of the cache).
+	  if (s.last_pass < 4) goto cleanup;
 
-	  // Short-circuit to pass 5.
-	  goto pass_5;
+	  // Short-circuit to pass 4.5.
+	  goto pass_4point5;
 	}
     }
 
@@ -810,8 +812,20 @@ main (int argc, char * const argv [])
 	}
     }
 
-  if (rc || s.last_pass == 4) goto cleanup;
+  if (rc) goto cleanup;
 
+  // PASS 4.5: BUILD SYSTEMTAP'S VERSION OF UPROBES (IF NECESSARY)
+pass_4point5:
+  if (s.need_uprobes)
+    {
+      if (s.last_pass == 5 && uprobes_enabled())
+	// Uprobes symbols are currently available in the kernel,
+	// so staprun won't use what we'd build anyway.
+	goto pass_5;
+
+	(void) make_uprobes(s);
+    }
+  if (s.last_pass == 4) goto cleanup;
 
   // PASS 5: RUN
 pass_5: