[PATCH] Add cgraph_edge::debug function.

[Martin Liška]

I see it handy to debug cgraph_edge and I've dumped it manually many times.
Maybe it's time to come up with the function? Example output:

(gdb) p e->debug()
ag/9 -> h/3 (1 (adjusted),0.25 per call)

ag/9 (ag) @0x7ffff773eca8
   Type: function definition analyzed
   Visibility: public
   next sharing asm name: 7
   References: table/5 (addr)
   Referring:
   Function ag/9 is inline copy in ap/4
   Clone of ag/7
   Availability: local
   Function flags: count:2 (adjusted) first_run:6 body local hot
   Called by: ai/8 (inlined) (indirect_inlining) (4 (adjusted),1.00 per call)
   Calls: h/3 (1 (adjusted),0.25 per call)
h/3 (h) @0x7ffff772b438
   Type: function definition analyzed
   Visibility: externally_visible public
   References: ap/4 (addr)
   Referring:
   Availability: available
   Profile id: 1806506296
   Function flags: count:4 (precise) first_run:3 body hot
   Called by: ag/9 (1 (adjusted),0.25 per call) ag/7 (1 (adjusted),0.25 per call) ag/0 (2 (estimated locally, globally 0 adjusted),0.50 per call) bug/2 (1 (precise),1.00 per call) bug/2 (1 (precise),1.00 per call)
   Calls: ai/1 (4 (precise),1.00 per call)

(gdb) p ie->debug()
ai/1 -> (null) (speculative) (0 (adjusted),0.00 per call)

ai/1 (ai) @0x7ffff772b168
   Type: function definition analyzed
   Visibility: prevailing_def_ironly
   previous sharing asm name: 8
   References: table/5 (addr) ap/4 (addr) (speculative) ag/0 (addr) (speculative)
   Referring:
   Function ai/1 is inline copy in h/3
   Availability: local
   Profile id: 1923518911
   Function flags: count:4 (precise) first_run:4 body local hot
   Called by: h/3 (inlined) (4 (precise),1.00 per call)
   Calls: ag/7 (speculative) (inlined) (2 (adjusted),0.50 per call) ap/4 (speculative) (2 (adjusted),0.50 per call) PyErr_Format/6 (0 (precise),0.00 per call)
    Indirect call(speculative) (0 (adjusted),0.00 per call)  of param:1 (vptr maybe changed) Num speculative call targets: 2

Ready to be installed?
Thanks,
Martin

gcc/ChangeLog:

	* cgraph.c (cgraph_edge::debug): New.
	* cgraph.h (cgraph_edge::debug): New.
---
  gcc/cgraph.c | 14 ++++++++++++++
  gcc/cgraph.h |  3 +++
  2 files changed, 17 insertions(+)

diff --git a/gcc/cgraph.c b/gcc/cgraph.c
index b43adaac7c0..46c3b124b1a 100644
--- a/gcc/cgraph.c
+++ b/gcc/cgraph.c
@@ -2072,6 +2072,20 @@ cgraph_edge::dump_edge_flags (FILE *f)
      fprintf (f, "(can throw external) ");
  }
  
+/* Dump edge to stderr.  */
+
+void
+cgraph_edge::debug (void)
+{
+  fprintf (stderr, "%s -> %s ", caller->dump_asm_name (),
+	   callee == NULL ? "(null)" : callee->dump_asm_name ());
+  dump_edge_flags (stderr);
+  fprintf (stderr, "\n\n");
+  caller->debug ();
+  if (callee != NULL)
+    callee->debug ();
+}
+
  /* Dump call graph node to file F.  */
  
  void
diff --git a/gcc/cgraph.h b/gcc/cgraph.h
index 0211f08964f..96d6cf609fe 100644
--- a/gcc/cgraph.h
+++ b/gcc/cgraph.h
@@ -2022,6 +2022,9 @@ private:
    /* Output flags of edge to a file F.  */
    void dump_edge_flags (FILE *f);
  
+  /* Dump edge to stderr.  */
+  void DEBUG_FUNCTION debug (void);
+
    /* Verify that call graph edge corresponds to DECL from the associated
       statement.  Return true if the verification should fail.  */
    bool verify_corresponds_to_fndecl (tree decl);
-- 
2.28.0