analyzer: add .fpath.txt dumps to -fdump-analyzer-feasibility

(cherry picked from r13-6-gd8586b00dd00a1783862da5f0c8811a740400074)

I found this extension to -fdump-analyzer-feasibility very helpful when
debugging PR analyzer/105285.

gcc/analyzer/ChangeLog:
	* diagnostic-manager.cc (epath_finder::process_worklist_item):
	Call dump_feasible_path when a path that reaches the the target
	enode is found.
	(epath_finder::dump_feasible_path): New.
	* engine.cc (feasibility_state::dump_to_pp): New.
	* exploded-graph.h (feasibility_state::dump_to_pp): New decl.
	* feasible-graph.cc (feasible_graph::dump_feasible_path): New.
	* feasible-graph.h (feasible_graph::dump_feasible_path): New
	decls.
	* program-point.cc (function_point::print): Fix missing trailing
	newlines.
	* program-point.h (program_point::print_source_line): Remove
	unimplemented decl.

gcc/ChangeLog:
	* doc/invoke.texi (-fdump-analyzer-feasibility): Mention the
	fpath.txt output.

Signed-off-by: David Malcolm <dmalcolm@redhat.com>

1 files changed, 24 insertions, 0 deletions

diff --git a/gcc/analyzer/diagnostic-manager.cc b/gcc/analyzer/diagnostic-manager.cc
index bf7c8fc5147..5bd4cd49cac 100644
--- a/gcc/analyzer/diagnostic-manager.cc
+++ b/gcc/analyzer/diagnostic-manager.cc
@@ -112,6 +112,10 @@ private:
   void dump_feasible_graph (const exploded_node *target_enode,
 			    const char *desc, unsigned diag_idx,
 			    const feasible_graph &fg);
+  void dump_feasible_path (const exploded_node *target_enode,
+			   unsigned diag_idx,
+			   const feasible_graph &fg,
+			   const feasible_node &fnode) const;
 
   const exploded_graph &m_eg;
   shortest_exploded_paths *m_sep;
@@ -510,6 +514,9 @@ epath_finder::process_worklist_item (feasible_worklist *worklist,
 			     target_enode->m_index, diag_idx,
 			     succ_fnode->get_path_length ());
 	      *out_best_path = fg->make_epath (succ_fnode);
+	      if (flag_dump_analyzer_feasibility)
+		dump_feasible_path (target_enode, diag_idx, *fg, *succ_fnode);
+
 	      /* Success: stop the worklist iteration.  */
 	      return false;
 	    }
@@ -608,6 +615,23 @@ epath_finder::dump_feasible_graph (const exploded_node *target_enode,
   free (filename);
 }
 
+/* Dump the path to FNODE to "BASE_NAME.DIAG_IDX.to-enN.fpath.txt".  */
+
+void
+epath_finder::dump_feasible_path (const exploded_node *target_enode,
+				  unsigned diag_idx,
+				  const feasible_graph &fg,
+				  const feasible_node &fnode) const
+{
+  auto_timevar tv (TV_ANALYZER_DUMP);
+  pretty_printer pp;
+  pp_printf (&pp, "%s.%i.to-en%i.fpath.txt",
+	     dump_base_name, diag_idx, target_enode->m_index);
+  char *filename = xstrdup (pp_formatted_text (&pp));
+  fg.dump_feasible_path (fnode, filename);
+  free (filename);
+}
+
 /* class saved_diagnostic.  */
 
 /* saved_diagnostic's ctor.