[coverage] Enable sanitizer coverage.

tools/run-tests.py

 #!/usr/bin/env python
 #
 # Copyright 2012 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
@@ skipping 190 matching lines @@
   result.add_option("--arch",
                     help=("The architecture to run tests for, "
                           "'auto' or 'native' for auto-detect: %s" % SUPPORTED_ARCHS),
                     default="ia32,x64,arm")
   result.add_option("--arch-and-mode",
                     help="Architecture and mode in the format 'arch.mode'",
                     default=None)
   result.add_option("--asan",
                     help="Regard test expectations for ASAN",
                     default=False, action="store_true")
+  result.add_option("--sancov-dir",
+                    help="Directory where to collect coverage data")
   result.add_option("--cfi-vptr",
                     help="Run tests with UBSAN cfi_vptr option.",
                     default=False, action="store_true")
   result.add_option("--buildbot",
                     help="Adapt to path structure used on buildbots",
                     default=False, action="store_true")
   result.add_option("--dcheck-always-on",
                     help="Indicates that V8 was compiled with DCHECKs enabled",
                     default=False, action="store_true")
   result.add_option("--novfp3",
@@ skipping 157 matching lines @@
   symbolizer = 'external_symbolizer_path=%s' % (
       os.path.join(
           BASE_DIR, 'third_party', 'llvm-build', 'Release+Asserts', 'bin',
           'llvm-symbolizer',
       )
   )
 
   if options.asan:
     os.environ['ASAN_OPTIONS'] = symbolizer
 
+  if options.sancov_dir:
+    assert os.path.exists(options.sancov_dir)
+    os.environ['ASAN_OPTIONS'] = ":".join([
+      'coverage=1',
+      'coverage_dir=%s' % options.sancov_dir,
+      symbolizer,
+    ])
+
   if options.cfi_vptr:
     os.environ['UBSAN_OPTIONS'] = ":".join([
       'print_stacktrace=1',
       'print_summary=1',
       'symbolize=1',
       symbolizer,
     ])
 
   if options.msan:
     os.environ['MSAN_OPTIONS'] = symbolizer
@@ skipping 283 matching lines @@
                         timeout, options.isolates,
                         options.command_prefix,
                         options.extra_flags,
                         options.no_i18n,
                         options.random_seed,
                         options.no_sorting,
                         options.rerun_failures_count,
                         options.rerun_failures_max,
                         options.predictable,
                         options.no_harness,
-                        use_perf_data=not options.swarming)
+                        use_perf_data=not options.swarming,
+                        sancov_dir=options.sancov_dir)
 
   # TODO(all): Combine "simulator" and "simulator_run".
   simulator_run = not options.dont_skip_simulator_slow_tests and \
       arch in ['arm64', 'arm', 'mipsel', 'mips', 'mips64', 'mips64el', \
                'ppc', 'ppc64'] and \
       ARCH_GUESS and arch != ARCH_GUESS
   # Find available test suites and read test cases from them.
   variables = {
     "arch": arch,
     "asan": options.asan,
@@ skipping 111 matching lines @@
   if exit_code == 1 and options.json_test_results:
     print("Force exit code 0 after failures. Json test results file generated "
           "with failure information.")
     exit_code = 0
 
   return exit_code
 
 
 if __name__ == "__main__":
   sys.exit(Main())