[foozzie] Add suppressions based on metadata.

tools/foozzie/v8_suppressions.py

 # Copyright 2016 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """
 Suppressions for V8 correctness fuzzer failures.
 
 We support three types of suppressions:
 1. Ignore test case by pattern.
 Map a regular expression to a bug entry. A new failure will be reported
@@ skipping 15 matching lines @@
 
 import itertools
 import re
 
 # Max line length for regular experessions checking for lines to ignore.
 MAX_LINE_LENGTH = 512
 
 # For ignoring lines before carets and to ignore caret positions.
 CARET_RE = re.compile(r'^\s*\^\s*$')
 
+# Ignore by original source files. Map from bug->relative file paths in V8,
+# e.g. '/v8/test/mjsunit/d8-performance-now.js' including /v8/. A test will
+# be suppressed if one of the files below was used to mutate the test.
+IGNORE_SOURCES = {
+  # This contains a usage of f.arguments that often fires.
+  'crbug.com/662424': '/v8/test/mjsunit/regress/regress-2989.js',
+}
+
 # Ignore by test case pattern. Map from bug->regexp.
 # Regular expressions are assumed to be compiled. We use regexp.match.
 IGNORE_TEST_CASES = {
   'crbug.com/662907':
       re.compile(r'.*new Array.*\[\d+\] =.*'
                  r'((Array)|(Object)).prototype.__defineSetter__.*', re.S),
 
   'crbug.com/663340':
       re.compile(r'.*\.shift\(\).*', re.S),
 
@@ skipping 160 matching lines @@
 
 
 def get_suppression(arch1, config1, arch2, config2):
   return V8Suppression(arch1, config1, arch2, config2)
 
 
 class Suppression(object):
   def diff(self, output1, output2):
     return None
 
-  def ignore(self, testcase):
+  def ignore_by_metadata(self, metadata):
+    return False
+
+  def ignore_by_content(self, testcase):
     return False
 
   def ignore_by_output1(self, output):
     return False
 
   def ignore_by_output2(self, output):
     return False
 
 
 class V8Suppression(Suppression):
   def __init__(self, arch1, config1, arch2, config2):
     self.arch1 = arch1
     self.config1 = config1
     self.arch2 = arch2
     self.config2 = config2
 
   def diff(self, output1, output2):
     return diff_output(
         output1.splitlines(),
         output2.splitlines(),
         ALLOWED_LINE_DIFFS,
         IGNORE_LINES,
         IGNORE_LINES,
     )
 
-  def ignore(self, testcase):
+  def ignore_by_content(self, testcase):
     for bug, exp in IGNORE_TEST_CASES.iteritems():
       if exp.match(testcase):
         return bug
     return False
 
+  def ignore_by_metadata(self, metadata):
+    for bug, source in IGNORE_SOURCES.iteritems():
+      if source in metadata['sources']:
+        return bug
+    return False
+
   def ignore_by_output1(self, output):
     return self.ignore_by_output(output, self.arch1, self.config1)
 
   def ignore_by_output2(self, output):
     return self.ignore_by_output(output, self.arch2, self.config2)
 
   def ignore_by_output(self, output, arch, config):
     def check(mapping):
       for bug, exp in mapping.iteritems():
         if exp.search(output):
           return bug
       return None
     bug = check(IGNORE_OUTPUT.get('', {}))
     if bug:
       return bug
     bug = check(IGNORE_OUTPUT.get(arch, {}))
     if bug:
       return bug
     bug = check(IGNORE_OUTPUT.get(config, {}))
     if bug:
       return bug
     bug = check(IGNORE_OUTPUT.get('%s,%s' % (arch, config), {}))
     if bug:
       return bug
     return None