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