зеркало из https://github.com/mozilla/gecko-dev.git
179 строки
6.6 KiB
Makefile
179 строки
6.6 KiB
Makefile
#
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# ***** BEGIN LICENSE BLOCK *****
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# Version: MPL 1.1/GPL 2.0/LGPL 2.1
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#
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# The contents of this file are subject to the Mozilla Public License Version
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# 1.1 (the "License"); you may not use this file except in compliance with
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# the License. You may obtain a copy of the License at
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# http://www.mozilla.org/MPL/
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#
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# Software distributed under the License is distributed on an "AS IS" basis,
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# WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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# for the specific language governing rights and limitations under the
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# License.
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#
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# The Original Code is mozilla.org code.
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#
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# The Initial Developer of the Original Code is
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# Mozilla Foundation
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# Portions created by the Initial Developer are Copyright (C) 2008
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# the Initial Developer. All Rights Reserved.
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#
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# Contributor(s):
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# Ted Mielczarek <ted.mielczarek@gmail.com>
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#
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# Alternatively, the contents of this file may be used under the terms of
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# either of the GNU General Public License Version 2 or later (the "GPL"),
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# or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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# in which case the provisions of the GPL or the LGPL are applicable instead
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# of those above. If you wish to allow use of your version of this file only
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# under the terms of either the GPL or the LGPL, and not to allow others to
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# use your version of this file under the terms of the MPL, indicate your
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# decision by deleting the provisions above and replace them with the notice
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# and other provisions required by the GPL or the LGPL. If you do not delete
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# the provisions above, a recipient may use your version of this file under
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# the terms of any one of the MPL, the GPL or the LGPL.
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#
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# ***** END LICENSE BLOCK *****
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DEPTH = ../..
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topsrcdir = @top_srcdir@
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srcdir = @srcdir@
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VPATH = @srcdir@
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include $(DEPTH)/config/autoconf.mk
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MODULE = mozutils
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LIBRARY_NAME = mozutils
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DIST_INSTALL = 1
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ifdef MOZ_MEMORY
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SHARED_LIBRARY_LIBS = $(call EXPAND_LIBNAME_PATH,jemalloc,../jemalloc)
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else
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# Temporary, until bug 662814 lands
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VISIBILITY_FLAGS =
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CPPSRCS = dummy.cpp
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endif
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# Build mozutils as a shared lib on Windows, OSX and Android.
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ifneq (,$(filter WINNT Darwin Android,$(OS_TARGET)))
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FORCE_SHARED_LIB = 1
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else
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FORCE_STATIC_LIB = 1
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endif
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MOZ_UTILS_LDFLAGS = # Don't link against ourselves
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ifeq (WINNT,$(OS_TARGET))
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DEFFILE = mozutils.def
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mozutils.def: mozutils.def.in
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$(PYTHON) $(topsrcdir)/config/Preprocessor.py $(ACDEFINES) $< > $@
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GARBAGE += mozutils.def
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LDFLAGS += -ENTRY:DllMain
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ifneq (,$(filter -DEFAULTLIB:mozcrt,$(MOZ_UTILS_LDFLAGS)))
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# Don't install the import library if we use mozcrt
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NO_INSTALL_IMPORT_LIBRARY = 1
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endif
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endif
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ifeq (android, $(MOZ_WIDGET_TOOLKIT))
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# Add Android linker
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EXTRA_DSO_LDOPTS += $(ZLIB_LIBS)
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SHARED_LIBRARY_LIBS += $(call EXPAND_LIBNAME_PATH,android,$(DEPTH)/other-licenses/android)
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endif
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ifeq (Android, $(OS_TARGET))
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WRAP_LDFLAGS =
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endif
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include $(topsrcdir)/config/rules.mk
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ifdef MOZ_MEMORY
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ifeq (Darwin,$(OS_TARGET))
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LDFLAGS += -init _jemalloc_darwin_init
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endif
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ifeq (WINNT,$(OS_TARGET))
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# Roll our own custom logic here for the import library
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###############################################################################
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#
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# Linking Mozilla itself to jemalloc is not particularly difficult. To do this
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# we avoid linking directly to the Microsoft-provided CRT import libraries.
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# Instead, we link to our own import library which we generate here. To
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# replace the CRT's malloc/free/other memory management symbols we export
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# our own versions out of jemalloc.dll. We then take the import library that
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# the compiler generates for jemalloc.dll and combine it with the MS CRT import
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# libraries. We put our library on the command line first, and the CRT symbols
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# are discarded in favor of our versions!
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#
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# Unfortunately that was too easy. The CRT import library is not a standard
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# import library that contains a list of symbols and whatnot. It also includes
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# object files that are linked into generated programs. One of these,
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# crtdll.obj is (as one might expect) linked into all DLLs that link against
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# the CRT. This file does things like run static C++ constructors when the
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# DLL is attached, call DllMain, etc.
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#
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# In the CRT source all malloc/free calls are made to malloc_crt and free_crt.
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# In debug builds these are both defined to malloc_dbg and free_dbg. In opt
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# builds malloc_crt is an actual function, implemented and exposed from the
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# CRT. free_crt is, however, defined to be just plain old free. This works
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# fine inside the CRT where malloc_crt and free operate on the same heap.
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# Outside the CRT malloc_crt is in the CRT's heap, but free is in jemalloc's
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# heap. This causes much pain at shutdown :-(
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#
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# The obvious solution here is to override malloc_crt too. Unfortunately,
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# that doesn't work because the CRT expects to be able to call msize on this
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# piece of memory deep inside the CRT, which will fail because it'll call the
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# CRT's msize on a pointer in jemalloc's heap.
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#
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# Our solution to this is quite devious. We take apart the CRT's import lib
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# and remove the problematic object file. We then poke at the object file's
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# symbol table and replace '__imp__free' (which means grab free from some
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# other DLL) with '__imp__frex'. Then we define our own dummy no-op function
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# in jemalloc.dll and export it as frex. Then we put the CRT import lib
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# back together with the patched crtdll.obj, glue it to the end of jemalloc's
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# import library and link the rest of Mozilla to that.
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#
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# The result? A binary that uses jemalloc, doesn't crash, and leaks a tiny
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# amount of memory (32 words per DLL in the 2010 CRT) at shutdown.
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#
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###############################################################################
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libs:: mozcrt.lib
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$(INSTALL) $(IFLAGS2) mozcrt.lib $(DIST)/lib
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# And finally combine that with the jemalloc import library to get an import
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# library that has our malloc/free/etc and the CRT's everything else
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mozcrt.lib: $(IMPORT_LIBRARY) msvc_modified.lib
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lib -OUT:$@ $^
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# Put the fixed object file back in
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msvc_modified.lib: msvc_removed.lib crtdll_fixed.obj
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lib -OUT:$@ $^
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# Fix the object file
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crtdll_fixed.obj: crtdll.obj
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$(PYTHON) $(srcdir)/fixcrt.py
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# Find the path of crtdll.obj
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CRTDLL_FULLPATH=$(subst \,\\,$(shell lib -list msvc_combined.lib | grep crtdll\\.obj))
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# Remove the broken object file, only after we have extracted it
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msvc_removed.lib: msvc_combined.lib crtdll.obj
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lib -OUT:$@ msvc_combined.lib -REMOVE:$(CRTDLL_FULLPATH)
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# Extract the broken object file out of the combined library
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crtdll.obj: msvc_combined.lib
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lib -OUT:$@ $^ -EXTRACT:$(CRTDLL_FULLPATH)
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# Grab both CRT libraries and combine them into one library to simplify things
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msvc_combined.lib:
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lib -OUT:$@ $(WIN32_CRT_LIBS)
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endif
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endif # MOZ_MEMORY
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