1 files changed, 378 insertions, 0 deletions
diff --git a/deps/v8/tools/gcmole/gcmole.lua b/deps/v8/tools/gcmole/gcmole.lua
new file mode 100644
index 0000000000..4afc66d1cb
--- /dev/null
+++ b/deps/v8/tools/gcmole/gcmole.lua
@@ -0,0 +1,378 @@
+-- Copyright 2011 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
+--       copyright notice, this list of conditions and the following
+--       disclaimer in the documentation and/or other materials provided
+--       with the distribution.
+--     * Neither the name of Google Inc. nor the names of its
+--       contributors may be used to endorse or promote products derived
+--       from this software without specific prior written permission.
+--
+-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+-- "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+-- LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+-- A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+-- OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+-- SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+-- LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+-- DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+-- THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+-- (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+-- OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+-- This is main driver for gcmole tool. See README for more details.
+-- Usage: CLANG_BIN=clang-bin-dir lua tools/gcmole/gcmole.lua [arm|ia32|x64]
+
+local DIR = arg[0]:match("^(.+)/[^/]+$")
+
+local FLAGS = {
+   -- Do not build gcsuspects file and reuse previously generated one.
+   reuse_gcsuspects = false;
+
+   -- Print commands to console before executing them.
+   verbose = false;
+
+   -- Perform dead variable analysis (generates many false positives).
+   -- TODO add some sort of whiteliste to filter out false positives.
+   dead_vars = false;
+
+   -- When building gcsuspects whitelist certain functions as if they
+   -- can be causing GC. Currently used to reduce number of false
+   -- positives in dead variables analysis. See TODO for WHITELIST
+   -- below.
+   whitelist = true;
+}
+local ARGS = {}
+
+for i = 1, #arg do
+   local flag = arg[i]:match "^%-%-([%w_-]+)$"
+   if flag then
+      local no, real_flag = flag:match "^(no)([%w_-]+)$"
+      if real_flag then flag = real_flag end
+
+      flag = flag:gsub("%-", "_")
+      if FLAGS[flag] ~= nil then
+         FLAGS[flag] = (no ~= "no")
+      else
+         error("Unknown flag: " .. flag)
+      end
+   else
+      table.insert(ARGS, arg[i])
+   end
+end
+
+local ARCHS = ARGS[1] and { ARGS[1] } or { 'ia32', 'arm', 'x64' }
+
+local io = require "io"
+local os = require "os"
+
+function log(...)
+   io.stderr:write(string.format(...))
+   io.stderr:write "\n"
+end
+
+-------------------------------------------------------------------------------
+-- Clang invocation
+
+local CLANG_BIN = os.getenv "CLANG_BIN"
+
+if not CLANG_BIN or CLANG_BIN == "" then
+   error "CLANG_BIN not set"
+end
+
+local function MakeClangCommandLine(plugin, plugin_args, triple, arch_define)
+   if plugin_args then
+     for i = 1, #plugin_args do
+        plugin_args[i] = "-plugin-arg-" .. plugin .. " " .. plugin_args[i]
+     end
+     plugin_args = " " .. table.concat(plugin_args, " ")
+   end
+   return CLANG_BIN .. "/clang -cc1 -load " .. DIR .. "/libgcmole.so"
+      .. " -plugin "  .. plugin
+      .. (plugin_args or "")
+      .. " -triple " .. triple
+      .. " -D" .. arch_define
+      .. " -DENABLE_VMSTATE_TRACKING"
+      .. " -DENABLE_LOGGING_AND_PROFILING"
+      .. " -DENABLE_DEBUGGER_SUPPORT"
+      .. " -Isrc"
+end
+
+function InvokeClangPluginForEachFile(filenames, cfg, func)
+   local cmd_line = MakeClangCommandLine(cfg.plugin,
+                                         cfg.plugin_args,
+                                         cfg.triple,
+                                         cfg.arch_define)
+
+   for _, filename in ipairs(filenames) do
+      log("-- %s", filename)
+      local action = cmd_line .. " src/" .. filename .. " 2>&1"
+      if FLAGS.verbose then print('popen ', action) end
+      local pipe = io.popen(action)
+      func(filename, pipe:lines())
+      pipe:close()
+   end
+end
+
+-------------------------------------------------------------------------------
+-- SConscript parsing
+
+local function ParseSConscript()
+   local f = assert(io.open("src/SConscript"), "failed to open SConscript")
+   local sconscript = f:read('*a')
+   f:close()
+
+   local SOURCES = sconscript:match "SOURCES = {(.-)}";
+
+   local sources = {}
+
+   for condition, list in
+      SOURCES:gmatch "'([^']-)': Split%(\"\"\"(.-)\"\"\"%)" do
+      local files = {}
+      for file in list:gmatch "[^%s]+" do table.insert(files, file) end
+      sources[condition] = files
+   end
+
+   for condition, list in SOURCES:gmatch "'([^']-)': %[(.-)%]" do
+      local files = {}
+      for file in list:gmatch "'([^']-)'" do table.insert(files, file) end
+      sources[condition] = files
+   end
+
+   return sources
+end
+
+local function EvaluateCondition(cond, props)
+   if cond == 'all' then return true end
+
+   local p, v = cond:match "(%w+):(%w+)"
+
+   assert(p and v, "failed to parse condition: " .. cond)
+   assert(props[p] ~= nil, "undefined configuration property: " .. p)
+
+   return props[p] == v
+end
+
+local function BuildFileList(sources, props)
+   local list = {}
+   for condition, files in pairs(sources) do
+      if EvaluateCondition(condition, props) then
+         for i = 1, #files do table.insert(list, files[i]) end
+      end
+   end
+   return list
+end
+
+local sources = ParseSConscript()
+
+local function FilesForArch(arch)
+   return BuildFileList(sources, { os = 'linux',
+                                   arch = arch,
+                                   mode = 'debug',
+                                   simulator = ''})
+end
+
+local mtConfig = {}
+
+mtConfig.__index = mtConfig
+
+local function config (t) return setmetatable(t, mtConfig) end
+
+function mtConfig:extend(t)
+   local e = {}
+   for k, v in pairs(self) do e[k] = v end
+   for k, v in pairs(t) do e[k] = v end
+   return config(e)
+end
+
+local ARCHITECTURES = {
+   ia32 = config { triple = "i586-unknown-linux",
+                   arch_define = "V8_TARGET_ARCH_IA32" },
+   arm = config { triple = "i586-unknown-linux",
+                  arch_define = "V8_TARGET_ARCH_ARM" },
+   x64 = config { triple = "x86_64-unknown-linux",
+                  arch_define = "V8_TARGET_ARCH_X64" }
+}
+
+-------------------------------------------------------------------------------
+-- GCSuspects Generation
+
+local gc, gc_caused, funcs
+
+local WHITELIST = {
+   -- The following functions call CEntryStub which is always present.
+   "MacroAssembler.*CallExternalReference",
+   "MacroAssembler.*CallRuntime",
+   "CompileCallLoadPropertyWithInterceptor",
+   "CallIC.*GenerateMiss",
+
+   -- DirectCEntryStub is a special stub used on ARM. 
+   -- It is pinned and always present.
+   "DirectCEntryStub.*GenerateCall",  
+
+   -- TODO GCMole currently is sensitive enough to understand that certain 
+   --      functions only cause GC and return Failure simulataneously. 
+   --      Callsites of such functions are safe as long as they are properly 
+   --      check return value and propagate the Failure to the caller.
+   --      It should be possible to extend GCMole to understand this.
+   "Heap.*AllocateFunctionPrototype"
+};
+
+local function AddCause(name, cause)
+   local t = gc_caused[name]
+   if not t then
+      t = {}
+      gc_caused[name] = t
+   end
+   table.insert(t, cause)
+end
+
+local function resolve(name)
+   local f = funcs[name]
+
+   if not f then
+      f = {}
+      funcs[name] = f
+
+      if name:match "Collect.*Garbage" then
+         gc[name] = true
+         AddCause(name, "<GC>")
+      end
+
+      if FLAGS.whitelist then
+         for i = 1, #WHITELIST do
+            if name:match(WHITELIST[i]) then
+               gc[name] = false
+            end
+         end
+      end
+   end
+
+    return f
+end
+
+local function parse (filename, lines)
+   local scope
+
+   for funcname in lines do
+      if funcname:sub(1, 1) ~= '\t' then
+         resolve(funcname)
+         scope = funcname
+      else
+         local name = funcname:sub(2)
+         resolve(name)[scope] = true
+      end
+   end
+end
+
+local function propagate ()
+   log "** Propagating GC information"
+
+   local function mark(from, callers)
+      for caller, _ in pairs(callers) do
+         if gc[caller] == nil then
+            gc[caller] = true
+            mark(caller, funcs[caller])
+         end
+         AddCause(caller, from)
+      end
+   end
+
+   for funcname, callers in pairs(funcs) do
+      if gc[funcname] then mark(funcname, callers) end
+   end
+end
+
+local function GenerateGCSuspects(arch, files, cfg)
+   -- Reset the global state.
+   gc, gc_caused, funcs = {}, {}, {}
+
+   log ("** Building GC Suspects for %s", arch)
+   InvokeClangPluginForEachFile (files,
+                                 cfg:extend { plugin = "dump-callees" },
+                                 parse)
+
+   propagate()
+
+   local out = assert(io.open("gcsuspects", "w"))
+   for name, value in pairs(gc) do if value then out:write (name, '\n') end end
+   out:close()
+
+   local out = assert(io.open("gccauses", "w"))
+   out:write "GC = {"
+   for name, causes in pairs(gc_caused) do
+      out:write("['", name, "'] = {")
+      for i = 1, #causes do out:write ("'", causes[i], "';") end
+      out:write("};\n")
+   end
+   out:write "}"
+   out:close()
+
+   log ("** GCSuspects generated for %s", arch)
+end
+
+--------------------------------------------------------------------------------
+-- Analysis
+
+local function CheckCorrectnessForArch(arch)
+   local files = FilesForArch(arch)
+   local cfg = ARCHITECTURES[arch]
+
+   if not FLAGS.reuse_gcsuspects then
+      GenerateGCSuspects(arch, files, cfg)
+   end
+
+   local processed_files = 0
+   local errors_found = false
+   local function SearchForErrors(filename, lines)
+      processed_files = processed_files + 1
+      for l in lines do
+         errors_found = errors_found or
+            l:match "^[^:]+:%d+:%d+:" or
+            l:match "error" or
+            l:match "warning"
+         print(l)
+      end
+   end
+
+   log("** Searching for evaluation order problems%s for %s",
+       FLAGS.dead_vars and " and dead variables" or "",
+       arch)
+   local plugin_args
+   if FLAGS.dead_vars then plugin_args = { "--dead-vars" } end
+   InvokeClangPluginForEachFile(files,
+                                cfg:extend { plugin = "find-problems",
+                                             plugin_args = plugin_args },
+                                SearchForErrors)
+   log("** Done processing %d files. %s",
+       processed_files,
+       errors_found and "Errors found" or "No errors found")
+
+   return errors_found
+end
+
+local function SafeCheckCorrectnessForArch(arch)
+   local status, errors = pcall(CheckCorrectnessForArch, arch)
+   if not status then
+      print(string.format("There was an error: %s", errors))
+      errors = true
+   end
+   return errors
+end
+
+local errors = false
+
+for _, arch in ipairs(ARCHS) do
+   if not ARCHITECTURES[arch] then
+      error ("Unknown arch: " .. arch)
+   end
+
+   errors = SafeCheckCorrectnessForArch(arch, report) or errors
+end
+
+os.exit(errors and 1 or 0)