1 -- Copyright 2011 the V8 project authors. All rights reserved.
2 -- Redistribution and use in source and binary forms, with or without
3 -- modification, are permitted provided that the following conditions are
6 -- * Redistributions of source code must retain the above copyright
7 -- notice, this list of conditions and the following disclaimer.
8 -- * Redistributions in binary form must reproduce the above
9 -- copyright notice, this list of conditions and the following
10 -- disclaimer in the documentation and/or other materials provided
11 -- with the distribution.
12 -- * Neither the name of Google Inc. nor the names of its
13 -- contributors may be used to endorse or promote products derived
14 -- from this software without specific prior written permission.
16 -- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 -- "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 -- LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 -- A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 -- OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 -- SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 -- LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 -- DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 -- THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 -- (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 -- OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 -- This is main driver for gcmole tool. See README for more details.
29 -- Usage: CLANG_BIN=clang-bin-dir lua tools/gcmole/gcmole.lua [arm|ia32|x64]
31 local DIR = arg[0]:match("^(.+)/[^/]+$")
34 -- Do not build gcsuspects file and reuse previously generated one.
35 reuse_gcsuspects = false;
37 -- Print commands to console before executing them.
40 -- Perform dead variable analysis (generates many false positives).
41 -- TODO add some sort of whiteliste to filter out false positives.
44 -- When building gcsuspects whitelist certain functions as if they
45 -- can be causing GC. Currently used to reduce number of false
46 -- positives in dead variables analysis. See TODO for WHITELIST
53 local flag = arg[i]:match "^%-%-([%w_-]+)$"
55 local no, real_flag = flag:match "^(no)([%w_-]+)$"
56 if real_flag then flag = real_flag end
58 flag = flag:gsub("%-", "_")
59 if FLAGS[flag] ~= nil then
60 FLAGS[flag] = (no ~= "no")
62 error("Unknown flag: " .. flag)
65 table.insert(ARGS, arg[i])
69 local ARCHS = ARGS[1] and { ARGS[1] } or { 'ia32', 'arm', 'x64' }
71 local io = require "io"
72 local os = require "os"
75 io.stderr:write(string.format(...))
79 -------------------------------------------------------------------------------
82 local CLANG_BIN = os.getenv "CLANG_BIN"
84 if not CLANG_BIN or CLANG_BIN == "" then
85 error "CLANG_BIN not set"
88 local function MakeClangCommandLine(plugin, plugin_args, triple, arch_define)
90 for i = 1, #plugin_args do
91 plugin_args[i] = "-plugin-arg-" .. plugin .. " " .. plugin_args[i]
93 plugin_args = " " .. table.concat(plugin_args, " ")
95 return CLANG_BIN .. "/clang -cc1 -load " .. DIR .. "/libgcmole.so"
96 .. " -plugin " .. plugin
97 .. (plugin_args or "")
98 .. " -triple " .. triple
99 .. " -D" .. arch_define
100 .. " -DENABLE_DEBUGGER_SUPPORT"
104 function InvokeClangPluginForEachFile(filenames, cfg, func)
105 local cmd_line = MakeClangCommandLine(cfg.plugin,
110 for _, filename in ipairs(filenames) do
111 log("-- %s", filename)
112 local action = cmd_line .. " src/" .. filename .. " 2>&1"
113 if FLAGS.verbose then print('popen ', action) end
114 local pipe = io.popen(action)
115 func(filename, pipe:lines())
120 -------------------------------------------------------------------------------
121 -- SConscript parsing
123 local function ParseSConscript()
124 local f = assert(io.open("src/SConscript"), "failed to open SConscript")
125 local sconscript = f:read('*a')
128 local SOURCES = sconscript:match "SOURCES = {(.-)}";
132 for condition, list in
133 SOURCES:gmatch "'([^']-)': Split%(\"\"\"(.-)\"\"\"%)" do
135 for file in list:gmatch "[^%s]+" do table.insert(files, file) end
136 sources[condition] = files
139 for condition, list in SOURCES:gmatch "'([^']-)': %[(.-)%]" do
141 for file in list:gmatch "'([^']-)'" do table.insert(files, file) end
142 sources[condition] = files
148 local function EvaluateCondition(cond, props)
149 if cond == 'all' then return true end
151 local p, v = cond:match "(%w+):(%w+)"
153 assert(p and v, "failed to parse condition: " .. cond)
154 assert(props[p] ~= nil, "undefined configuration property: " .. p)
159 local function BuildFileList(sources, props)
161 for condition, files in pairs(sources) do
162 if EvaluateCondition(condition, props) then
163 for i = 1, #files do table.insert(list, files[i]) end
169 local sources = ParseSConscript()
171 local function FilesForArch(arch)
172 return BuildFileList(sources, { os = 'linux',
180 mtConfig.__index = mtConfig
182 local function config (t) return setmetatable(t, mtConfig) end
184 function mtConfig:extend(t)
186 for k, v in pairs(self) do e[k] = v end
187 for k, v in pairs(t) do e[k] = v end
191 local ARCHITECTURES = {
192 ia32 = config { triple = "i586-unknown-linux",
193 arch_define = "V8_TARGET_ARCH_IA32" },
194 arm = config { triple = "i586-unknown-linux",
195 arch_define = "V8_TARGET_ARCH_ARM" },
196 x64 = config { triple = "x86_64-unknown-linux",
197 arch_define = "V8_TARGET_ARCH_X64" }
200 -------------------------------------------------------------------------------
201 -- GCSuspects Generation
203 local gc, gc_caused, funcs
206 -- The following functions call CEntryStub which is always present.
207 "MacroAssembler.*CallExternalReference",
208 "MacroAssembler.*CallRuntime",
209 "CompileCallLoadPropertyWithInterceptor",
210 "CallIC.*GenerateMiss",
212 -- DirectCEntryStub is a special stub used on ARM.
213 -- It is pinned and always present.
214 "DirectCEntryStub.*GenerateCall",
216 -- TODO GCMole currently is sensitive enough to understand that certain
217 -- functions only cause GC and return Failure simulataneously.
218 -- Callsites of such functions are safe as long as they are properly
219 -- check return value and propagate the Failure to the caller.
220 -- It should be possible to extend GCMole to understand this.
221 "Heap.*AllocateFunctionPrototype"
224 local function AddCause(name, cause)
225 local t = gc_caused[name]
230 table.insert(t, cause)
233 local function resolve(name)
234 local f = funcs[name]
240 if name:match "Collect.*Garbage" then
242 AddCause(name, "<GC>")
245 if FLAGS.whitelist then
246 for i = 1, #WHITELIST do
247 if name:match(WHITELIST[i]) then
257 local function parse (filename, lines)
260 for funcname in lines do
261 if funcname:sub(1, 1) ~= '\t' then
265 local name = funcname:sub(2)
266 resolve(name)[scope] = true
271 local function propagate ()
272 log "** Propagating GC information"
274 local function mark(from, callers)
275 for caller, _ in pairs(callers) do
276 if gc[caller] == nil then
278 mark(caller, funcs[caller])
280 AddCause(caller, from)
284 for funcname, callers in pairs(funcs) do
285 if gc[funcname] then mark(funcname, callers) end
289 local function GenerateGCSuspects(arch, files, cfg)
290 -- Reset the global state.
291 gc, gc_caused, funcs = {}, {}, {}
293 log ("** Building GC Suspects for %s", arch)
294 InvokeClangPluginForEachFile (files,
295 cfg:extend { plugin = "dump-callees" },
300 local out = assert(io.open("gcsuspects", "w"))
301 for name, value in pairs(gc) do if value then out:write (name, '\n') end end
304 local out = assert(io.open("gccauses", "w"))
306 for name, causes in pairs(gc_caused) do
307 out:write("['", name, "'] = {")
308 for i = 1, #causes do out:write ("'", causes[i], "';") end
314 log ("** GCSuspects generated for %s", arch)
317 --------------------------------------------------------------------------------
320 local function CheckCorrectnessForArch(arch)
321 local files = FilesForArch(arch)
322 local cfg = ARCHITECTURES[arch]
324 if not FLAGS.reuse_gcsuspects then
325 GenerateGCSuspects(arch, files, cfg)
328 local processed_files = 0
329 local errors_found = false
330 local function SearchForErrors(filename, lines)
331 processed_files = processed_files + 1
333 errors_found = errors_found or
334 l:match "^[^:]+:%d+:%d+:" or
341 log("** Searching for evaluation order problems%s for %s",
342 FLAGS.dead_vars and " and dead variables" or "",
345 if FLAGS.dead_vars then plugin_args = { "--dead-vars" } end
346 InvokeClangPluginForEachFile(files,
347 cfg:extend { plugin = "find-problems",
348 plugin_args = plugin_args },
350 log("** Done processing %d files. %s",
352 errors_found and "Errors found" or "No errors found")
357 local function SafeCheckCorrectnessForArch(arch)
358 local status, errors = pcall(CheckCorrectnessForArch, arch)
360 print(string.format("There was an error: %s", errors))
368 for _, arch in ipairs(ARCHS) do
369 if not ARCHITECTURES[arch] then
370 error ("Unknown arch: " .. arch)
373 errors = SafeCheckCorrectnessForArch(arch, report) or errors
376 os.exit(errors and 1 or 0)