analyzer: early rejection of disabled warnings [PR104955]

Avoid generating execution paths for warnings that are ultimately
rejected due to -Wno-analyzer-* flags.

This improves the test case from taking at least several minutes
(before I killed it) to taking under a second.

This doesn't fix the slowdown seen in PR analyzer/104955 with large
numbers of warnings when the warnings are still enabled.

gcc/analyzer/ChangeLog:
	PR analyzer/104955
	* diagnostic-manager.cc (get_emission_location): New.
	(diagnostic_manager::diagnostic_manager): Initialize
	m_num_disabled_diagnostics.
	(diagnostic_manager::add_diagnostic): Reject diagnostics that
	will eventually be rejected due to being disabled.
	(diagnostic_manager::emit_saved_diagnostics): Log the number
	of disabled diagnostics.
	(diagnostic_manager::emit_saved_diagnostic): Split out logic for
	determining emission location to get_emission_location.
	* diagnostic-manager.h
	(diagnostic_manager::m_num_disabled_diagnostics): New field.
	* engine.cc (stale_jmp_buf::get_controlling_option): New.
	(stale_jmp_buf::emit): Use it.
	* pending-diagnostic.h
	(pending_diagnostic::get_controlling_option): New vfunc.
	* region-model.cc
	(poisoned_value_diagnostic::get_controlling_option): New.
	(poisoned_value_diagnostic::emit): Use it.
	(shift_count_negative_diagnostic::get_controlling_option): New.
	(shift_count_negative_diagnostic::emit): Use it.
	(shift_count_overflow_diagnostic::get_controlling_option): New.
	(shift_count_overflow_diagnostic::emit): Use it.
	(dump_path_diagnostic::get_controlling_option): New.
	(dump_path_diagnostic::emit): Use it.
	(write_to_const_diagnostic::get_controlling_option): New.
	(write_to_const_diagnostic::emit): Use it.
	(write_to_string_literal_diagnostic::get_controlling_option): New.
	(write_to_string_literal_diagnostic::emit): Use it.
	* sm-file.cc (double_fclose::get_controlling_option): New.
	(double_fclose::emit): Use it.
	(file_leak::get_controlling_option): New.
	(file_leak::emit): Use it.
	* sm-malloc.cc (mismatching_deallocation::get_controlling_option):
	New.
	(mismatching_deallocation::emit): Use it.
	(double_free::get_controlling_option): New.
	(double_free::emit): Use it.
	(possible_null_deref::get_controlling_option): New.
	(possible_null_deref::emit): Use it.
	(possible_null_arg::get_controlling_option): New.
	(possible_null_arg::emit): Use it.
	(null_deref::get_controlling_option): New.
	(null_deref::emit): Use it.
	(null_arg::get_controlling_option): New.
	(null_arg::emit): Use it.
	(use_after_free::get_controlling_option): New.
	(use_after_free::emit): Use it.
	(malloc_leak::get_controlling_option): New.
	(malloc_leak::emit): Use it.
	(free_of_non_heap::get_controlling_option): New.
	(free_of_non_heap::emit): Use it.
	* sm-pattern-test.cc (pattern_match::get_controlling_option): New.
	(pattern_match::emit): Use it.
	* sm-sensitive.cc
	(exposure_through_output_file::get_controlling_option): New.
	(exposure_through_output_file::emit): Use it.
	* sm-signal.cc (signal_unsafe_call::get_controlling_option): New.
	(signal_unsafe_call::emit): Use it.
	* sm-taint.cc (tainted_array_index::get_controlling_option): New.
	(tainted_array_index::emit): Use it.
	(tainted_offset::get_controlling_option): New.
	(tainted_offset::emit): Use it.
	(tainted_size::get_controlling_option): New.
	(tainted_size::emit): Use it.
	(tainted_divisor::get_controlling_option): New.
	(tainted_divisor::emit): Use it.
	(tainted_allocation_size::get_controlling_option): New.
	(tainted_allocation_size::emit): Use it.

gcc/testsuite/ChangeLog:
	* gcc.dg/analyzer/many-disabled-diagnostics.c: New test.
	* gcc.dg/plugin/analyzer_gil_plugin.c
	(gil_diagnostic::get_controlling_option): New.
	(double_save_thread::emit): Use it.
	(fncall_without_gil::emit): Likewise.
	(pyobject_usage_without_gil::emit): Likewise.

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

1 files changed, 13 insertions, 3 deletions

diff --git a/gcc/analyzer/sm-file.cc b/gcc/analyzer/sm-file.cc
index 1c996f9..ffc2809 100644
--- a/gcc/analyzer/sm-file.cc
+++ b/gcc/analyzer/sm-file.cc
@@ -157,9 +157,14 @@ public:
 
   const char *get_kind () const FINAL OVERRIDE { return "double_fclose"; }
 
+  int get_controlling_option () const FINAL OVERRIDE
+  {
+    return OPT_Wanalyzer_double_fclose;
+  }
+
   bool emit (rich_location *rich_loc) FINAL OVERRIDE
   {
-    return warning_at (rich_loc, OPT_Wanalyzer_double_fclose,
+    return warning_at (rich_loc, get_controlling_option (),
 		       "double %<fclose%> of FILE %qE",
 		       m_arg);
   }
@@ -197,6 +202,11 @@ public:
 
   const char *get_kind () const FINAL OVERRIDE { return "file_leak"; }
 
+  int get_controlling_option () const FINAL OVERRIDE
+  {
+    return OPT_Wanalyzer_file_leak;
+  }
+
   bool emit (rich_location *rich_loc) FINAL OVERRIDE
   {
     diagnostic_metadata m;
@@ -204,11 +214,11 @@ public:
        Effective Lifetime". */
     m.add_cwe (775);
     if (m_arg)
-      return warning_meta (rich_loc, m, OPT_Wanalyzer_file_leak,
+      return warning_meta (rich_loc, m, get_controlling_option (),
 			   "leak of FILE %qE",
 			   m_arg);
     else
-      return warning_meta (rich_loc, m, OPT_Wanalyzer_file_leak,
+      return warning_meta (rich_loc, m, get_controlling_option (),
 			   "leak of FILE");
   }