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384 lines
11 KiB
384 lines
11 KiB
-- Copyright 2011 the V8 project authors. All rights reserved.
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-- Redistribution and use in source and binary forms, with or without
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-- modification, are permitted provided that the following conditions are
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-- met:
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--
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-- * Redistributions of source code must retain the above copyright
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-- notice, this list of conditions and the following disclaimer.
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-- * Redistributions in binary form must reproduce the above
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-- copyright notice, this list of conditions and the following
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-- disclaimer in the documentation and/or other materials provided
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-- with the distribution.
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-- * Neither the name of Google Inc. nor the names of its
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-- contributors may be used to endorse or promote products derived
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-- from this software without specific prior written permission.
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--
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-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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-- "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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-- LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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-- A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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-- OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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-- SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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-- LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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-- DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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-- THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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-- (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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-- OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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-- This is main driver for gcmole tool. See README for more details.
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-- Usage: CLANG_BIN=clang-bin-dir lua tools/gcmole/gcmole.lua [arm|ia32|x64]
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local DIR = arg[0]:match("^(.+)/[^/]+$")
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local FLAGS = {
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-- Do not build gcsuspects file and reuse previously generated one.
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reuse_gcsuspects = false;
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-- Print commands to console before executing them.
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verbose = false;
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-- Perform dead variable analysis (generates many false positives).
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-- TODO add some sort of whiteliste to filter out false positives.
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dead_vars = false;
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-- When building gcsuspects whitelist certain functions as if they
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-- can be causing GC. Currently used to reduce number of false
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-- positives in dead variables analysis. See TODO for WHITELIST
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-- below.
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whitelist = true;
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}
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local ARGS = {}
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for i = 1, #arg do
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local flag = arg[i]:match "^%-%-([%w_-]+)$"
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if flag then
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local no, real_flag = flag:match "^(no)([%w_-]+)$"
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if real_flag then flag = real_flag end
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flag = flag:gsub("%-", "_")
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if FLAGS[flag] ~= nil then
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FLAGS[flag] = (no ~= "no")
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else
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error("Unknown flag: " .. flag)
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end
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else
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table.insert(ARGS, arg[i])
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end
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end
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local ARCHS = ARGS[1] and { ARGS[1] } or { 'ia32', 'arm', 'x64' }
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local io = require "io"
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local os = require "os"
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function log(...)
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io.stderr:write(string.format(...))
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io.stderr:write "\n"
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end
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-------------------------------------------------------------------------------
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-- Clang invocation
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local CLANG_BIN = os.getenv "CLANG_BIN"
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local CLANG_PLUGINS = os.getenv "CLANG_PLUGINS"
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if not CLANG_BIN or CLANG_BIN == "" then
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error "CLANG_BIN not set"
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end
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if not CLANG_PLUGINS or CLANG_PLUGINS == "" then
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CLANG_PLUGINS = DIR
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end
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local function MakeClangCommandLine(plugin, plugin_args, triple, arch_define)
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if plugin_args then
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for i = 1, #plugin_args do
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plugin_args[i] = "-plugin-arg-" .. plugin .. " " .. plugin_args[i]
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end
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plugin_args = " " .. table.concat(plugin_args, " ")
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end
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return CLANG_BIN .. "/clang -cc1 -load " .. CLANG_PLUGINS .. "/libgcmole.so"
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.. " -plugin " .. plugin
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.. (plugin_args or "")
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.. " -triple " .. triple
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.. " -D" .. arch_define
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.. " -DENABLE_DEBUGGER_SUPPORT"
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.. " -DV8_I18N_SUPPORT"
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.. " -Isrc"
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.. " -Ithird_party/icu/source/common"
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.. " -Ithird_party/icu/source/i18n"
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end
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function InvokeClangPluginForEachFile(filenames, cfg, func)
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local cmd_line = MakeClangCommandLine(cfg.plugin,
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cfg.plugin_args,
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cfg.triple,
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cfg.arch_define)
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for _, filename in ipairs(filenames) do
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log("-- %s", filename)
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local action = cmd_line .. " src/" .. filename .. " 2>&1"
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if FLAGS.verbose then print('popen ', action) end
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local pipe = io.popen(action)
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func(filename, pipe:lines())
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local success = pipe:close()
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if not success then error("Failed to run: " .. action) end
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end
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end
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-------------------------------------------------------------------------------
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-- GYP file parsing
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local function ParseGYPFile()
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local f = assert(io.open("tools/gyp/v8.gyp"), "failed to open GYP file")
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local gyp = f:read('*a')
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f:close()
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local result = {}
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for condition, sources in
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gyp:gmatch "'sources': %[.-### gcmole%((.-)%) ###(.-)%]" do
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local files = {}
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for file in sources:gmatch "'%.%./%.%./src/([^']-%.cc)'" do
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table.insert(files, file)
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end
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result[condition] = files
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end
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return result
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end
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local function EvaluateCondition(cond, props)
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if cond == 'all' then return true end
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local p, v = cond:match "(%w+):(%w+)"
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assert(p and v, "failed to parse condition: " .. cond)
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assert(props[p] ~= nil, "undefined configuration property: " .. p)
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return props[p] == v
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end
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local function BuildFileList(sources, props)
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local list = {}
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for condition, files in pairs(sources) do
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if EvaluateCondition(condition, props) then
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for i = 1, #files do table.insert(list, files[i]) end
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end
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end
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return list
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end
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local sources = ParseGYPFile()
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local function FilesForArch(arch)
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return BuildFileList(sources, { os = 'linux',
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arch = arch,
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mode = 'debug',
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simulator = ''})
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end
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local mtConfig = {}
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mtConfig.__index = mtConfig
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local function config (t) return setmetatable(t, mtConfig) end
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function mtConfig:extend(t)
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local e = {}
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for k, v in pairs(self) do e[k] = v end
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for k, v in pairs(t) do e[k] = v end
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return config(e)
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end
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local ARCHITECTURES = {
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ia32 = config { triple = "i586-unknown-linux",
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arch_define = "V8_TARGET_ARCH_IA32" },
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arm = config { triple = "i586-unknown-linux",
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arch_define = "V8_TARGET_ARCH_ARM" },
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x64 = config { triple = "x86_64-unknown-linux",
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arch_define = "V8_TARGET_ARCH_X64" }
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}
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-------------------------------------------------------------------------------
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-- GCSuspects Generation
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local gc, gc_caused, funcs
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local WHITELIST = {
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-- The following functions call CEntryStub which is always present.
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"MacroAssembler.*CallExternalReference",
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"MacroAssembler.*CallRuntime",
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"CompileCallLoadPropertyWithInterceptor",
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"CallIC.*GenerateMiss",
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-- DirectCEntryStub is a special stub used on ARM.
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-- It is pinned and always present.
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"DirectCEntryStub.*GenerateCall",
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-- TODO GCMole currently is sensitive enough to understand that certain
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-- functions only cause GC and return Failure simulataneously.
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-- Callsites of such functions are safe as long as they are properly
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-- check return value and propagate the Failure to the caller.
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-- It should be possible to extend GCMole to understand this.
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"Heap.*AllocateFunctionPrototype",
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-- Ignore all StateTag methods.
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"StateTag",
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-- Ignore printing of elements transition.
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"PrintElementsTransition"
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};
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local function AddCause(name, cause)
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local t = gc_caused[name]
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if not t then
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t = {}
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gc_caused[name] = t
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end
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table.insert(t, cause)
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end
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local function resolve(name)
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local f = funcs[name]
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if not f then
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f = {}
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funcs[name] = f
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if name:match "Collect.*Garbage" then
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gc[name] = true
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AddCause(name, "<GC>")
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end
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if FLAGS.whitelist then
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for i = 1, #WHITELIST do
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if name:match(WHITELIST[i]) then
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gc[name] = false
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end
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end
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end
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end
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return f
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end
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local function parse (filename, lines)
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local scope
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for funcname in lines do
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if funcname:sub(1, 1) ~= '\t' then
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resolve(funcname)
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scope = funcname
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else
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local name = funcname:sub(2)
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resolve(name)[scope] = true
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end
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end
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end
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local function propagate ()
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log "** Propagating GC information"
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local function mark(from, callers)
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for caller, _ in pairs(callers) do
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if gc[caller] == nil then
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gc[caller] = true
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mark(caller, funcs[caller])
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end
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AddCause(caller, from)
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end
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end
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for funcname, callers in pairs(funcs) do
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if gc[funcname] then mark(funcname, callers) end
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end
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end
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local function GenerateGCSuspects(arch, files, cfg)
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-- Reset the global state.
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gc, gc_caused, funcs = {}, {}, {}
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log ("** Building GC Suspects for %s", arch)
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InvokeClangPluginForEachFile (files,
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cfg:extend { plugin = "dump-callees" },
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parse)
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propagate()
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local out = assert(io.open("gcsuspects", "w"))
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for name, value in pairs(gc) do if value then out:write (name, '\n') end end
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out:close()
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local out = assert(io.open("gccauses", "w"))
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out:write "GC = {"
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for name, causes in pairs(gc_caused) do
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out:write("['", name, "'] = {")
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for i = 1, #causes do out:write ("'", causes[i], "';") end
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out:write("};\n")
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end
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out:write "}"
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out:close()
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log ("** GCSuspects generated for %s", arch)
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end
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--------------------------------------------------------------------------------
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-- Analysis
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local function CheckCorrectnessForArch(arch)
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local files = FilesForArch(arch)
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local cfg = ARCHITECTURES[arch]
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if not FLAGS.reuse_gcsuspects then
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GenerateGCSuspects(arch, files, cfg)
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end
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local processed_files = 0
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local errors_found = false
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local function SearchForErrors(filename, lines)
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processed_files = processed_files + 1
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for l in lines do
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errors_found = errors_found or
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l:match "^[^:]+:%d+:%d+:" or
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l:match "error" or
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l:match "warning"
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print(l)
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end
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end
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log("** Searching for evaluation order problems%s for %s",
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FLAGS.dead_vars and " and dead variables" or "",
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arch)
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local plugin_args
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if FLAGS.dead_vars then plugin_args = { "--dead-vars" } end
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InvokeClangPluginForEachFile(files,
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cfg:extend { plugin = "find-problems",
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plugin_args = plugin_args },
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SearchForErrors)
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log("** Done processing %d files. %s",
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processed_files,
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errors_found and "Errors found" or "No errors found")
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return errors_found
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end
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local function SafeCheckCorrectnessForArch(arch)
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local status, errors = pcall(CheckCorrectnessForArch, arch)
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if not status then
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print(string.format("There was an error: %s", errors))
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errors = true
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end
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return errors
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end
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local errors = false
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for _, arch in ipairs(ARCHS) do
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if not ARCHITECTURES[arch] then
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error ("Unknown arch: " .. arch)
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end
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errors = SafeCheckCorrectnessForArch(arch, report) or errors
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end
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os.exit(errors and 1 or 0)
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