qom: add the base Object class (v2)

This class provides the main building block for QEMU Object Model and is
extensively documented in the header file.  It is largely inspired by GObject.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
---
v1 -> v2
 - remove printf() in type registration
 - fix typo in comment (Paolo)
 - make Interface private
 - move object into a new directory and move header into include/qemu/
 - don't make object.h depend on qemu-common.h
 - remove Type and replace it with TypeImpl * (Paolo)
 - use hash table to store types (Paolo)
 - aggressively cache parent type (Paolo)
 - make a type_register and use it with interfaces (Paolo)
 - fix interface cast comment (Paolo)
 - add a few more functions required in later series

Makefile

@@ -114,6 +114,8 @@ QEMU_CFLAGS+=$(CURL_CFLAGS)
 
 QEMU_CFLAGS+=$(GLIB_CFLAGS)
 
+QEMU_CFLAGS += -I$(SRC_PATH)/include
+
 ui/cocoa.o: ui/cocoa.m
 
 ui/sdl.o audio/sdlaudio.o ui/sdl_zoom.o baum.o: QEMU_CFLAGS += $(SDL_CFLAGS)

Makefile.hw

@@ -11,6 +11,7 @@ $(call set-vpath, $(SRC_PATH):$(SRC_PATH)/hw)
 
 QEMU_CFLAGS+=-I..
 QEMU_CFLAGS += $(GLIB_CFLAGS)
+QEMU_CFLAGS += -I$(SRC_PATH)/include
 
 include $(SRC_PATH)/Makefile.objs
 

Makefile.objs

@@ -124,6 +124,9 @@ common-obj-$(CONFIG_WIN32) += version.o
 
 common-obj-$(CONFIG_SPICE) += ui/spice-core.o ui/spice-input.o ui/spice-display.o spice-qemu-char.o
 
+include $(SRC_PATH)/qom/Makefile
+common-obj-y += $(addprefix qom/, $(qom-y))
+
 audio-obj-y = audio.o noaudio.o wavaudio.o mixeng.o
 audio-obj-$(CONFIG_SDL) += sdlaudio.o
 audio-obj-$(CONFIG_OSS) += ossaudio.o

Makefile.target

@@ -22,6 +22,8 @@ QEMU_CFLAGS += -I.. -I$(TARGET_PATH) -DNEED_CPU_H
 
 include $(SRC_PATH)/Makefile.objs
 
+QEMU_CFLAGS+=-I$(SRC_PATH)/include
+
 ifdef CONFIG_USER_ONLY
 # user emulator name
 QEMU_PROG=qemu-$(TARGET_ARCH2)

configure

@@ -3785,7 +3785,7 @@ DIRS="$DIRS pc-bios/spapr-rtas"
 DIRS="$DIRS roms/seabios roms/vgabios"
 DIRS="$DIRS fsdev ui"
 DIRS="$DIRS qapi qapi-generated"
-DIRS="$DIRS qga trace"
+DIRS="$DIRS qga trace qom"
 FILES="Makefile tests/tcg/Makefile qdict-test-data.txt"
 FILES="$FILES tests/tcg/cris/Makefile tests/tcg/cris/.gdbinit"
 FILES="$FILES pc-bios/optionrom/Makefile pc-bios/keymaps"