[bugfix] Don't trigger analyzer without enabled checkers

analyzer/codechecker_analyzer/analyzer.py

@@ -28,7 +28,7 @@
 from . import analyzer_context, analysis_manager, pre_analysis_manager, \
     checkers
 from .analyzers import analyzer_types
-from .analyzers.config_handler import CheckerState
+from .analyzers.config_handler import AnalyzerConfigHandler, CheckerState
 from .analyzers.clangsa.analyzer import ClangSA
 
 from .makefile import MakeFileCreator
@@ -124,6 +124,15 @@ def __get_ctu_data(ctu_dir):
             'ctu_temp_fnmap_folder': 'tmpExternalFnMaps'}
 
 
+def __has_enabled_checker(ch: AnalyzerConfigHandler):
+    """
+    Returns True if at least one checker is enabled in the given config
+    handler.
+    """
+    return any(state == CheckerState.enabled
+               for _, (state, _) in ch.checks().items())
+
+
 def perform_analysis(args, skip_handlers, actions, metadata_tool,
                      compile_cmd_count):
     """
@@ -160,9 +169,16 @@ def perform_analysis(args, skip_handlers, actions, metadata_tool,
                       "the Clang Static Analyzer.")
             return
 
-    actions = prepare_actions(actions, analyzers)
     config_map = analyzer_types.build_config_handlers(args, analyzers)
 
+    no_checker_analyzers = \
+        [a for a in analyzers if not __has_enabled_checker(config_map[a])]
+    for analyzer in no_checker_analyzers:
+        LOG.info("No checkers enabled for %s", analyzer)
+        analyzers.remove(analyzer)
+
+    actions = prepare_actions(actions, analyzers)
+
     available_checkers = set()
     # Add profile names to the checkers list so we will not warn
     # if a profile is enabled but there is no checker with that name.

analyzer/codechecker_analyzer/cmd/analyze.py

@@ -752,6 +752,15 @@ def add_arguments_to_parser(parser):
                                     "the analysis. USE WISELY AND AT YOUR "
                                     "OWN RISK!")
 
+    checkers_opts.add_argument('--disable-all',
+                               dest="disable_all",
+                               required=False,
+                               default=argparse.SUPPRESS,
+                               action='store_true',
+                               help="Disable all checkers of all analyzers. "
+                                    "It is equivalent to using \"--disable "
+                                    "default\" as the first argument.")
+
     checkers_opts.add_argument('--no-missing-checker-error',
                                dest="no_missing_checker_error",
                                action='store_true',
@@ -916,6 +925,10 @@ def main(args):
 
     if 'enable_all' in args:
         LOG.info("'--enable-all' was supplied for this analysis.")
+    if 'disable_all' in args:
+        if 'ordered_checkers' not in args:
+            args.ordered_checkers = []
+        args.ordered_checkers.insert(0, ('default', False))
 
     # Enable alpha uniqueing by default if ctu analysis is used.
     if 'none' in args.compile_uniqueing and 'ctu_phases' in args:

analyzer/codechecker_analyzer/cmd/check.py

@@ -698,6 +698,15 @@ def add_arguments_to_parser(parser):
                                     "the analysis. USE WISELY AND AT YOUR "
                                     "OWN RISK!")
 
+    checkers_opts.add_argument('--disable-all',
+                               dest="disable_all",
+                               required=False,
+                               default=argparse.SUPPRESS,
+                               action='store_true',
+                               help="Disable all checkers of all analyzers. "
+                                    "It is equivalent to using \"--disable "
+                                    "default\" as the first argument.")
+
     checkers_opts.add_argument('--no-missing-checker-error',
                                dest="no_missing_checker_error",
                                action='store_true',
@@ -860,6 +869,7 @@ def __update_if_key_exists(source, target, key):
                           'stats_relevance_threshold',
                           'stats_min_sample_count',
                           'enable_all',
+                          'disable_all',
                           'ordered_checkers',  # --enable and --disable.
                           'timeout',
                           'compile_uniqueing',

analyzer/tests/functional/analyze/test_analyze.py

@@ -1093,6 +1093,47 @@ def test_makefile_generation(self):
         plist_files = glob.glob(os.path.join(self.report_dir, '*.plist'))
         self.assertEqual(len(plist_files), 4)
 
+    def test_disable_all_checkers(self):
+        """
+        If all checkers of an analyzer are disabled then the analysis shouldn't
+        trigger for that analyzer.
+        """
+        build_json = os.path.join(self.test_workspace, "build.json")
+        build_log = [{"directory": self.test_workspace,
+                      "command": "gcc -c main.c",
+                      "file": "main.c"}]
+
+        with open(build_json, 'w',
+                  encoding="utf-8", errors="ignore") as outfile:
+            json.dump(build_log, outfile)
+
+        for analyzer in ['clangsa', 'clang-tidy']:
+            analyze_cmd = [self._codechecker_cmd, "check", "-l", build_json,
+                           "--analyzers", analyzer,
+                           "--disable", "default"]
+            process = subprocess.Popen(
+                analyze_cmd,
+                stdout=subprocess.PIPE,
+                stderr=subprocess.PIPE,
+                encoding="utf-8",
+                errors="ignore")
+            out, _ = process.communicate()
+
+            self.assertIn(f"No checkers enabled for {analyzer}", out)
+
+        analyze_cmd = [self._codechecker_cmd, "check", "-l", build_json,
+                       "--disable-all"]
+        process = subprocess.Popen(
+            analyze_cmd,
+            stdout=subprocess.PIPE,
+            stderr=subprocess.PIPE,
+            encoding="utf-8",
+            errors="ignore")
+        out, _ = process.communicate()
+
+        # Checkers of all 3 analyzers are disabled.
+        self.assertEqual(out.count("No checkers enabled for"), 3)
+
     def test_analyzer_and_checker_config(self):
         """Test analyzer configuration through command line flags."""
         build_json = os.path.join(self.test_workspace, "build_success.json")

docs/analyzer/user_guide.md

@@ -29,6 +29,7 @@
       - [Toggling compiler warnings](#toggling-compiler-warnings)
       - [Checker profiles](#checker-profiles)
         - [`--enable-all`](#--enable-all)
+        - [`--disable-all`](#--disable-all)
       - [Cross Translation Unit (CTU) analysis mode](#cross-translation-unit-ctu-analysis-mode)
       - [Taint analysis configuration](#taint-analysis-configuration)
       - [Statistical analysis mode](#statistical-analysis-mode)
@@ -145,7 +146,8 @@ usage: CodeChecker check [-h] [-o OUTPUT_DIR] [-t {plist}] [-q]
                          [--ctu-reanalyze-on-failure]
                          [--ctu-ast-mode {load-from-pch,parse-on-demand}]
                          [-e checker/group/profile] [-d checker/group/profile]
-                         [--enable-all] [--print-steps] [--suppress SUPPRESS]
+                         [--enable-all] [--disable-all] [--print-steps]
+                         [--suppress SUPPRESS]
                          [--review-status [REVIEW_STATUS [REVIEW_STATUS ...]]]
                          [--verbose {info,debug,debug_analyzer}]
 
@@ -443,6 +445,8 @@ checker configuration:
                         and stability, and could even result in a total
                         failure of the analysis. USE WISELY AND AT YOUR OWN
                         RISK!
+  --disable-all         Disable all checkers of all analyzers. It is equivalent
+                        to using "--disable default" as the first argument.
 
 output arguments:
   --print-steps         Print the steps the analyzers took in finding the
@@ -922,6 +926,7 @@ usage: CodeChecker analyze [-h] [-j JOBS]
                            [--ctu-reanalyze-on-failure]
                            [-e checker/group/profile]
                            [-d checker/group/profile] [--enable-all]
+                           [--disable-all]
                            [--verbose {info,debug,debug_analyzer}]
                            input
 
@@ -1390,6 +1395,8 @@ checker configuration:
                         and stability, and could even result in a total
                         failure of the analysis. USE WISELY AND AT YOUR OWN
                         RISK!
+  --disable-all         Disable all checkers of all analyzers. It is equivalent
+                        to using "--disable default" as the first argument.
 ```
 
 Both `--enable` and `--disable` take individual checkers, checker groups or
@@ -1501,6 +1508,17 @@ special checker groups: `alpha.`, `debug.`, `osx.`, `abseil-`, `android-`,
 
 can be used to "further" enable `alpha.` checkers, and disable `misc` ones.
 
+##### `--disable-all`
+
+Some checkers are always enabled by default, because they are categorized in
+`default` profile. This flag is equivalent to using `--disable default` which
+technically disables all checkers. The motivation behind `--disable-all` is to
+enable one specific checker and disable everything else:
+
+```sh
+CodeChecker check -l compile_commands.json --disable-all --enable core.DivideZero
+```
+
 #### Cross Translation Unit (CTU) analysis mode
 
 If the `clang` static analyzer binary in your installation supports