Add test case generator for runtime functions

tools/generate-runtime-tests.py

Index: tools/generate-runtime-tests.py
diff --git a/tools/generate-runtime-tests.py b/tools/generate-runtime-tests.py
new file mode 100755
index 0000000000000000000000000000000000000000..efd9d7068d0a4488149d5a79a46d2e5c2bb889e3
--- /dev/null
+++ b/tools/generate-runtime-tests.py
@@ -0,0 +1,509 @@
+#!/usr/bin/env python
+# Copyright 2014 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.
+
+import os
+import re
+import shutil
+import sys
+
+# TODO(jkummerow): Support DATA_VIEW_{G,S}ETTER in runtime.cc
+
+FILENAME = "src/runtime.cc"
+HEADERFILENAME = "src/runtime.h"
+FUNCTION = re.compile("^RUNTIME_FUNCTION\(Runtime_(\w+)")
+ARGSLENGTH = re.compile(".*ASSERT\(.*args\.length\(\) == (\d+)\);")
+FUNCTIONEND = "}\n"
+
+WORKSPACE = os.path.abspath(os.path.join(os.path.dirname(sys.argv[0]), ".."))
+BASEPATH = os.path.join(WORKSPACE, "test", "mjsunit", "runtime-gen")
+THIS_SCRIPT = os.path.relpath(sys.argv[0])
+
+# Counts of functions in each detection state. These are used to assert
+# that the parser doesn't bit-rot. Change the values as needed when you add,
+# remove or change runtime functions, but make sure we don't lose our ability
+# to parse them!
+EXPECTED_FUNCTION_COUNT = 339
+EXPECTED_FUZZABLE_COUNT = 316
+EXPECTED_CCTEST_COUNT = 6
+EXPECTED_UNKNOWN_COUNT = 5
+
+
+# Don't call these at all.
+BLACKLISTED = [
+  "Abort",  # Kills the process.
+  "AbortJS",  # Kills the process.
+  "CompileForOnStackReplacement",  # Riddled with ASSERTs.
+  "IS_VAR",  # Not implemented in the runtime.
+  "ListNatives",  # Not available in Release mode.
+  "SetAllocationTimeout",  # Too slow for fuzzing.
+  "SystemBreak",  # Kills (int3) the process.
+
+  # These are weird. They violate some invariants when called after
+  # bootstrapping.
+  "DisableAccessChecks",
+  "EnableAccessChecks",
+
+  # Seems to be incompatible with --stress-runs.
+  "LiveEditReplaceScript",
+
+  # TODO(jkummerow): Fix these and un-blacklist them!
+  "CreateDateTimeFormat",
+  "CreateNumberFormat",
+]
+
+
+# These will always throw.
+THROWS = [
+  "CheckExecutionState",  # Needs to hit a break point.
+  "CheckIsBootstrapping",  # Needs to be bootstrapping.
+  "DebugEvaluate",  # Needs to hit a break point.
+  "DebugEvaluateGlobal",  # Needs to hit a break point.
+  "DebugIndexedInterceptorElementValue",  # Needs an indexed interceptor.
+  "DebugNamedInterceptorPropertyValue",  # Needs a named interceptor.
+  "DebugSetScriptSource",  # Checks compilation state of script.
+  "GetAllScopesDetails",  # Needs to hit a break point.
+  "GetFrameCount",  # Needs to hit a break point.
+  "GetFrameDetails",  # Needs to hit a break point.
+  "GetRootNaN",  # Needs to be bootstrapping.
+  "GetScopeCount",  # Needs to hit a break point.
+  "GetScopeDetails",  # Needs to hit a break point.
+  "GetStepInPositions",  # Needs to hit a break point.
+  "GetTemplateField",  # Needs a {Function,Object}TemplateInfo.
+  "GetThreadCount",  # Needs to hit a break point.
+  "GetThreadDetails",  # Needs to hit a break point.
+  "IsAccessAllowedForObserver",  # Needs access-check-required object.
+  "LiveEditFunctionSourceUpdated",  # Needs a SharedFunctionInfo.
+  "LiveEditPatchFunctionPositions",  # Needs a SharedFunctionInfo.
+  "LiveEditReplaceFunctionCode",  # Needs a SharedFunctionInfo.
+  "LiveEditReplaceRefToNestedFunction",  # Needs a SharedFunctionInfo.
+  "LiveEditRestartFrame",  # Needs to hit a break point.
+  "UnblockConcurrentRecompilation"  # Needs --block-concurrent-recompilation.
+]
+
+
+# Definitions used in CUSTOM_KNOWN_GOOD_INPUT below.
+_BREAK_ITERATOR = (
+    "%GetImplFromInitializedIntlObject(new Intl.v8BreakIterator())")
+_COLLATOR = "%GetImplFromInitializedIntlObject(new Intl.Collator('en-US'))"
+_DATETIME_FORMAT = (
+    "%GetImplFromInitializedIntlObject(new Intl.DateTimeFormat('en-US'))")
+_NUMBER_FORMAT = (
+    "%GetImplFromInitializedIntlObject(new Intl.NumberFormat('en-US'))")
+_SCRIPT = "%DebugGetLoadedScripts()[1]"
+
+
+# Custom definitions for function input that does not throw.
+# Format: "FunctionName": ["arg0", "arg1", ..., argslength].
+# None means "fall back to autodetected value".
+CUSTOM_KNOWN_GOOD_INPUT = {
+  "Apply": ["function() {}", None, None, None, None, None],
+  "ArrayBufferSliceImpl": [None, None, 0, None],
+  "ArrayConcat": ["[1, 'a']", None],
+  "BreakIteratorAdoptText": [_BREAK_ITERATOR, None, None],
+  "BreakIteratorBreakType": [_BREAK_ITERATOR, None],
+  "BreakIteratorCurrent": [_BREAK_ITERATOR, None],
+  "BreakIteratorFirst": [_BREAK_ITERATOR, None],
+  "BreakIteratorNext": [_BREAK_ITERATOR, None],
+  "CompileString": [None, "false", None],
+  "CreateBreakIterator": ["'en-US'", "{type: 'string'}", None, None],
+  "CreateJSFunctionProxy": [None, "function() {}", None, None, None],
+  "CreatePrivateSymbol": ["\"foo\"", None],
+  "CreateSymbol": ["\"foo\"", None],
+  "DateParseString": [None, "new Array(8)", None],
+  "DebugSetScriptSource": [_SCRIPT, None, None],
+  "DefineOrRedefineAccessorProperty": [None, None, "function() {}",
+                                       "function() {}", 2, None],
+  "GetBreakLocations": [None, 0, None],
+  "GetDefaultReceiver": ["function() {}", None],
+  "GetImplFromInitializedIntlObject": ["new Intl.NumberFormat('en-US')", None],
+  "InternalCompare": [_COLLATOR, None, None, None],
+  "InternalDateFormat": [_DATETIME_FORMAT, None, None],
+  "InternalDateParse": [_DATETIME_FORMAT, None, None],
+  "InternalNumberFormat": [_NUMBER_FORMAT, None, None],
+  "InternalNumberParse": [_NUMBER_FORMAT, None, None],
+  "IsSloppyModeFunction": ["function() {}", None],
+  "LiveEditFindSharedFunctionInfosForScript": [_SCRIPT, None],
+  "LiveEditGatherCompileInfo": [_SCRIPT, None, None],
+  "LoadMutableDouble": ["{foo: 1.2}", None, None],
+  "NewObjectFromBound": ["(function() {}).bind({})", None],
+  "NumberToRadixString": [None, "2", None],
+  "ParseJson": ["\"{}\"", 1],
+  "RegExpExecMultiple": [None, None, "['a']", "['a']", None],
+  "SetAccessorProperty": [None, None, "undefined", "undefined", None, None,
+                          None],
+  "SetCreateIterator": [None, "2", None],
+  "SetDebugEventListener": ["undefined", None, None],
+  "SetFunctionBreakPoint": [None, 200, None, None],
+  "SetScriptBreakPoint": [_SCRIPT, None, 0, None, None],
+  "StringBuilderConcat": ["[1, 2, 3]", 3, None, None],
+  "StringBuilderJoin": ["['a', 'b']", 4, None, None],
+  "StringMatch": [None, None, "['a', 'b']", None],
+  "StringNormalize": [None, 2, None],
+  "StringReplaceGlobalRegExpWithString": [None, None, None, "['a']", None],
+  "TypedArrayInitialize": [None, 6, "new ArrayBuffer(8)", None, 4, None],
+  "TypedArrayInitializeFromArrayLike": [None, 6, None, None, None],
+  "TypedArraySetFastCases": [None, None, "0", None],
+}
+
+
+# Types of arguments that cannot be generated in a JavaScript testcase.
+NON_JS_TYPES = [
+  "Code", "Context", "FixedArray", "FunctionTemplateInfo",
+  "JSFunctionResultCache", "JSMessageObject", "Map", "ScopeInfo",
+  "SharedFunctionInfo"]
+
+
+# Maps argument types to concrete example inputs of that type.
+JS_TYPE_GENERATORS = {
+  "Boolean": "true",
+  "HeapObject": "new Object()",
+  "Int32": "32",
+  "JSArray": "new Array()",
+  "JSArrayBuffer": "new ArrayBuffer(8)",
+  "JSDataView": "new DataView(new ArrayBuffer(8))",
+  "JSDate": "new Date()",
+  "JSFunction": "function() {}",
+  "JSFunctionProxy": "Proxy.createFunction({}, function() {})",
+  "JSGeneratorObject": "(function*(){ yield 1; })()",
+  "JSMap": "new Map()",
+  "JSMapIterator": "%MapCreateIterator(new Map(), 3)",
+  "JSObject": "new Object()",
+  "JSProxy": "Proxy.create({})",
+  "JSReceiver": "new Object()",
+  "JSRegExp": "/ab/g",
+  "JSSet": "new Set()",
+  "JSSetIterator": "%SetCreateIterator(new Set(), 2)",
+  "JSTypedArray": "new Int32Array(2)",
+  "JSValue": "new String('foo')",
+  "JSWeakCollection": "new WeakMap()",
+  "Name": "\"name\"",
+  "Number": "1.5",
+  "Object": "new Object()",
+  "PropertyDetails": "513",
+  "SeqString": "\"seqstring\"",
+  "Smi": 1,
+  "StrictMode": "1",
+  "String": "\"foo\"",
+  "Symbol": "Symbol(\"symbol\")",
+  "Uint32": "32",
+}
+
+
+class ArgParser(object):
+  def __init__(self, regex, ctor):
+    self.regex = regex
+    self.ArgCtor = ctor
+
+
+class Arg(object):
+  def __init__(self, typename, varname, index):
+    self.type = typename
+    self.name = "_%s" % varname
+    self.index = index
+
+
+class Function(object):
+  def __init__(self, match):
+    self.name = match.group(1)
+    self.argslength = -1
+    self.args = {}
+    self.inline = ""
+
+  handle_arg_parser = ArgParser(
+      re.compile("^\s*CONVERT_ARG_HANDLE_CHECKED\((\w+), (\w+), (\d+)\)"),
+      lambda match: Arg(match.group(1), match.group(2), int(match.group(3))))
+
+  plain_arg_parser = ArgParser(
+      re.compile("^\s*CONVERT_ARG_CHECKED\((\w+), (\w+), (\d+)\)"),
+      lambda match: Arg(match.group(1), match.group(2), int(match.group(3))))
+
+  number_handle_arg_parser = ArgParser(
+      re.compile("^\s*CONVERT_NUMBER_ARG_HANDLE_CHECKED\((\w+), (\d+)\)"),
+      lambda match: Arg("Number", match.group(1), int(match.group(2))))
+
+  smi_arg_parser = ArgParser(
+      re.compile("^\s*CONVERT_SMI_ARG_CHECKED\((\w+), (\d+)\)"),
+      lambda match: Arg("Smi", match.group(1), int(match.group(2))))
+
+  double_arg_parser = ArgParser(
+      re.compile("^\s*CONVERT_DOUBLE_ARG_CHECKED\((\w+), (\d+)\)"),
+      lambda match: Arg("Number", match.group(1), int(match.group(2))))
+
+  number_arg_parser = ArgParser(
+      re.compile(
+          "^\s*CONVERT_NUMBER_CHECKED\(\w+, (\w+), (\w+), args\[(\d+)\]\)"),
+      lambda match: Arg(match.group(2), match.group(1), int(match.group(3))))
+
+  strict_mode_arg_parser = ArgParser(
+      re.compile("^\s*CONVERT_STRICT_MODE_ARG_CHECKED\((\w+), (\d+)\)"),
+      lambda match: Arg("StrictMode", match.group(1), int(match.group(2))))
+
+  boolean_arg_parser = ArgParser(
+      re.compile("^\s*CONVERT_BOOLEAN_ARG_CHECKED\((\w+), (\d+)\)"),
+      lambda match: Arg("Boolean", match.group(1), int(match.group(2))))
+
+  property_details_parser = ArgParser(
+      re.compile("^\s*CONVERT_PROPERTY_DETAILS_CHECKED\((\w+), (\d+)\)"),
+      lambda match: Arg("PropertyDetails", match.group(1), int(match.group(2))))
+
+  arg_parsers = [handle_arg_parser, plain_arg_parser, number_handle_arg_parser,
+                 smi_arg_parser,
+                 double_arg_parser, number_arg_parser, strict_mode_arg_parser,
+                 boolean_arg_parser, property_details_parser]
+
+
+  def SetArgsLength(self, match):
+    self.argslength = int(match.group(1))
+
+  def TryParseArg(self, line):
+    for parser in Function.arg_parsers:
+      match = parser.regex.match(line)
+      if match:
+        arg = parser.ArgCtor(match)
+        self.args[arg.index] = arg
+        return True
+    return False
+
+  def Filename(self):
+    return "%s.js" % self.name.lower()
+
+  def __str__(self):
+    s = [self.name, "("]
+    argcount = self.argslength
+    if argcount < 0:
+      print("WARNING: unknown argslength for function %s" % self.name)
+      if self.args:
+        argcount = max([self.args[i].index + 1 for i in self.args])
+      else:
+        argcount = 0
+    for i in range(argcount):
+      if i > 0: s.append(", ")
+      s.append(self.args[i].type if i in self.args else "<unknown>")
+    s.append(")")
+    return "".join(s)
+
+# Parses HEADERFILENAME to find out which runtime functions are "inline".
+def FindInlineRuntimeFunctions():
+  inline_functions = []
+  with open(HEADERFILENAME, "r") as f:
+    inline_list = "#define INLINE_FUNCTION_LIST(F) \\\n"
+    inline_opt_list = "#define INLINE_OPTIMIZED_FUNCTION_LIST(F) \\\n"
+    inline_function = re.compile(r"^\s*F\((\w+), \d+, \d+\)\s*\\?")
+    mode = "SEARCHING"
+    for line in f:
+      if mode == "ACTIVE":
+        match = inline_function.match(line)
+        if match:
+          inline_functions.append(match.group(1))
+        if not line.endswith("\\\n"):
+          mode = "SEARCHING"
+      elif mode == "SEARCHING":
+        if line == inline_list or line == inline_opt_list:
+          mode = "ACTIVE"
+  return inline_functions
+
+
+# Detects runtime functions by parsing FILENAME.
+def FindRuntimeFunctions():
+  inline_functions = FindInlineRuntimeFunctions()
+  functions = []
+  with open(FILENAME, "r") as f:
+    function = None
+    partial_line = ""
+    for line in f:
+      # Multi-line definition support, ignoring macros.
+      if line.startswith("RUNTIME_FUNCTION") and not line.endswith("{\n"):
+        if line.endswith("\\\n"): continue
+        partial_line = line.rstrip()
+        continue
+      if partial_line:
+        partial_line += " " + line.strip()
+        if partial_line.endswith("{"):
+          line = partial_line
+          partial_line = ""
+        else:
+          continue
+
+      match = FUNCTION.match(line)
+      if match:
+        function = Function(match)
+        if function.name in inline_functions:
+          function.inline = "_"
+        continue
+      if function is None: continue
+
+      match = ARGSLENGTH.match(line)
+      if match:
+        function.SetArgsLength(match)
+        continue
+
+      if function.TryParseArg(line):
+        continue
+
+      if line == FUNCTIONEND:
+        if function is not None:
+          functions.append(function)
+          function = None
+  return functions
+
+# Classifies runtime functions.
+def ClassifyFunctions(functions):
+  # Can be fuzzed with a JavaScript testcase.
+  js_fuzzable_functions = []
+  # We have enough information to fuzz these, but they need inputs that
+  # cannot be created or passed around in JavaScript.
+  cctest_fuzzable_functions = []
+  # This script does not have enough information about these.
+  unknown_functions = []
+
+  types = {}
+  for f in functions:
+    if f.name in BLACKLISTED:
+      continue
+    decision = js_fuzzable_functions
+    custom = CUSTOM_KNOWN_GOOD_INPUT.get(f.name, None)
+    if f.argslength < 0:
+      # Unknown length -> give up unless there's a custom definition.
+      if custom and custom[-1] is not None:
+        f.argslength = custom[-1]
+        assert len(custom) == f.argslength + 1, \
+            ("%s: last custom definition must be argslength" % f.name)
+      else:
+        decision = unknown_functions
+    else:
+      if custom:
+        # Any custom definitions must match the known argslength.
+        assert len(custom) == f.argslength + 1, \
+            ("%s should have %d custom definitions but has %d" %
+            (f.name, f.argslength + 1, len(custom)))
+      for i in range(f.argslength):
+        if custom and custom[i] is not None:
+          # All good, there's a custom definition.
+          pass
+        elif not i in f.args:
+          # No custom definition and no parse result -> give up.
+          decision = unknown_functions
+        else:
+          t = f.args[i].type
+          if t in NON_JS_TYPES:
+            decision = cctest_fuzzable_functions
+          else:
+            assert t in JS_TYPE_GENERATORS, \
+                ("type generator not found for %s, function: %s" % (t, f))
+    decision.append(f)
+  return (js_fuzzable_functions, cctest_fuzzable_functions, unknown_functions)
+
+
+def GenerateJSTestcaseForFunction(f):
+  s = ["// Copyright 2014 the V8 project authors. All rights reserved.",
+       "// AUTO-GENERATED BY tools/generate-runtime-tests.py, DO NOT MODIFY",
+       "// Flags: --allow-natives-syntax --harmony"]
+  call = "%%%s%s(" % (f.inline, f.name)
+  custom = CUSTOM_KNOWN_GOOD_INPUT.get(f.name, None)
+  for i in range(f.argslength):
+    if custom and custom[i] is not None:
+      (name, value) = ("arg%d" % i, custom[i])
+    else:
+      arg = f.args[i]
+      (name, value) = (arg.name, JS_TYPE_GENERATORS[arg.type])
+    s.append("var %s = %s;" % (name, value))
+    if i > 0: call += ", "
+    call += name
+  call += ");"
+  if f.name in THROWS:
+    s.append("try {")
+    s.append(call);
+    s.append("} catch(e) {}")
+  else:
+    s.append(call)
+  testcase = "\n".join(s)
+  path = os.path.join(BASEPATH, f.Filename())
+  with open(path, "w") as f:
+    f.write("%s\n" % testcase)
+
+def GenerateTestcases(functions):
+  shutil.rmtree(BASEPATH)  # Re-generate everything.
+  os.makedirs(BASEPATH)
+  for f in functions:
+    GenerateJSTestcaseForFunction(f)
+
+def PrintUsage():
+  print """Usage: %(this_script)s ACTION
+
+where ACTION can be:
+
+info      Print diagnostic info.
+check     Check that runtime functions can be parsed as expected, and that
+          test cases exist.
+generate  Parse source code for runtime functions, and auto-generate
+          test cases for them. Warning: this will nuke and re-create
+          %(path)s.
+""" % {"path": os.path.relpath(BASEPATH), "this_script": THIS_SCRIPT}
+
+if __name__ == "__main__":
+  if len(sys.argv) != 2:
+    PrintUsage()
+    sys.exit(1)
+  action = sys.argv[1]
+  if action in ["-h", "--help", "help"]:
+    PrintUsage()
+    sys.exit(0)
+
+  functions = FindRuntimeFunctions()
+  (js_fuzzable_functions, cctest_fuzzable_functions, unknown_functions) = \
+      ClassifyFunctions(functions)
+
+  if action == "info":
+    print("%d functions total; js_fuzzable_functions: %d, "
+          "cctest_fuzzable_functions: %d, unknown_functions: %d"
+          % (len(functions), len(js_fuzzable_functions),
+             len(cctest_fuzzable_functions), len(unknown_functions)))
+    print("unknown functions:")
+    for f in unknown_functions:
+      print(f)
+    sys.exit(0)
+
+  if action == "check":
+    error = False
+    def CheckCount(actual, expected, description):
+      global error
+      if len(actual) != expected:
+        print("Expected to detect %d %s, but found %d." % (
+              expected, description, len(actual)))
+        print("If this change is intentional, please update the expectations"
+              " at the top of %s." % THIS_SCRIPT)
+        error = True
+    CheckCount(functions, EXPECTED_FUNCTION_COUNT, "functions in total")
+    CheckCount(js_fuzzable_functions, EXPECTED_FUZZABLE_COUNT,
+               "JavaScript-fuzzable functions")
+    CheckCount(cctest_fuzzable_functions, EXPECTED_CCTEST_COUNT,
+               "cctest-fuzzable functions")
+    CheckCount(unknown_functions, EXPECTED_UNKNOWN_COUNT,
+               "functions with incomplete type information")
+
+    def CheckTestcasesExisting(functions):
+      global error
+      for f in functions:
+        if not os.path.isfile(os.path.join(BASEPATH, f.Filename())):
+          print("Missing testcase for %s, please run '%s generate'" %
+                (f.name, THIS_SCRIPT))
+          error = True
+      files = filter(lambda filename: not filename.startswith("."),
+                     os.listdir(BASEPATH))
+      if (len(files) != len(functions)):
+        unexpected_files = set(files) - set([f.Filename() for f in functions])
+        for f in unexpected_files:
+          print("Unexpected testcase: %s" % os.path.join(BASEPATH, f))
+          error = True
+    CheckTestcasesExisting(js_fuzzable_functions)
+
+    if error:
+      sys.exit(1)
+    print("Generated runtime tests: all good.")
+    sys.exit(0)
+
+  if action == "generate":
+    GenerateTestcases(js_fuzzable_functions)
+    sys.exit(0)