Fix qapi code generation wrt parallel build
Make's multiple output syntax
x.c x.h: x.template
gen < x.template
actually invokes the command once for x.c and once for x.h (with differing $@
in each invocation). During a parallel build, the two commands may be invoked
in parallel; this opens up a race, where the second invocation trashes a file
supposedly produced during the first, and now in use by a dependent command.
The various qapi code generators are susceptible to this; fix by making them
generate just one file per invocation.
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Avi Kivity
Anthony Liguori
parent
4e1ea514f9
commit
8d3bc5178f
20
Makefile
20
Makefile
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@ -173,35 +173,37 @@ qapi-dir := $(BUILD_DIR)/qapi-generated
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test-qmp-input-visitor.o test-qmp-output-visitor.o test-qmp-commands.o qemu-ga$(EXESUF): QEMU_CFLAGS += -I $(qapi-dir)
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qemu-ga$(EXESUF): LIBS = $(LIBS_QGA)
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gen-out-type = $(subst .,-,$@)
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$(qapi-dir)/test-qapi-types.c $(qapi-dir)/test-qapi-types.h :\
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$(SRC_PATH)/qapi-schema-test.json $(SRC_PATH)/scripts/qapi-types.py
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$(call quiet-command,$(PYTHON) $(SRC_PATH)/scripts/qapi-types.py -o "$(qapi-dir)" -p "test-" < $<, " GEN $@")
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$(call quiet-command,$(PYTHON) $(SRC_PATH)/scripts/qapi-types.py $(gen-out-type) -o "$(qapi-dir)" -p "test-" < $<, " GEN $@")
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$(qapi-dir)/test-qapi-visit.c $(qapi-dir)/test-qapi-visit.h :\
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$(SRC_PATH)/qapi-schema-test.json $(SRC_PATH)/scripts/qapi-visit.py
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$(call quiet-command,$(PYTHON) $(SRC_PATH)/scripts/qapi-visit.py -o "$(qapi-dir)" -p "test-" < $<, " GEN $@")
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$(call quiet-command,$(PYTHON) $(SRC_PATH)/scripts/qapi-visit.py $(gen-out-type) -o "$(qapi-dir)" -p "test-" < $<, " GEN $@")
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$(qapi-dir)/test-qmp-commands.h $(qapi-dir)/test-qmp-marshal.c :\
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$(SRC_PATH)/qapi-schema-test.json $(SRC_PATH)/scripts/qapi-commands.py
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$(call quiet-command,$(PYTHON) $(SRC_PATH)/scripts/qapi-commands.py -o "$(qapi-dir)" -p "test-" < $<, " GEN $@")
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$(call quiet-command,$(PYTHON) $(SRC_PATH)/scripts/qapi-commands.py $(gen-out-type) -o "$(qapi-dir)" -p "test-" < $<, " GEN $@")
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$(qapi-dir)/qga-qapi-types.c $(qapi-dir)/qga-qapi-types.h :\
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$(SRC_PATH)/qapi-schema-guest.json $(SRC_PATH)/scripts/qapi-types.py
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$(call quiet-command,$(PYTHON) $(SRC_PATH)/scripts/qapi-types.py -o "$(qapi-dir)" -p "qga-" < $<, " GEN $@")
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$(call quiet-command,$(PYTHON) $(SRC_PATH)/scripts/qapi-types.py $(gen-out-type) -o "$(qapi-dir)" -p "qga-" < $<, " GEN $@")
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$(qapi-dir)/qga-qapi-visit.c $(qapi-dir)/qga-qapi-visit.h :\
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$(SRC_PATH)/qapi-schema-guest.json $(SRC_PATH)/scripts/qapi-visit.py
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$(call quiet-command,$(PYTHON) $(SRC_PATH)/scripts/qapi-visit.py -o "$(qapi-dir)" -p "qga-" < $<, " GEN $@")
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$(call quiet-command,$(PYTHON) $(SRC_PATH)/scripts/qapi-visit.py $(gen-out-type) -o "$(qapi-dir)" -p "qga-" < $<, " GEN $@")
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$(qapi-dir)/qga-qmp-commands.h $(qapi-dir)/qga-qmp-marshal.c :\
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$(SRC_PATH)/qapi-schema-guest.json $(SRC_PATH)/scripts/qapi-commands.py
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$(call quiet-command,$(PYTHON) $(SRC_PATH)/scripts/qapi-commands.py -o "$(qapi-dir)" -p "qga-" < $<, " GEN $@")
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$(call quiet-command,$(PYTHON) $(SRC_PATH)/scripts/qapi-commands.py $(gen-out-type) -o "$(qapi-dir)" -p "qga-" < $<, " GEN $@")
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qapi-types.c qapi-types.h :\
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$(SRC_PATH)/qapi-schema.json $(SRC_PATH)/scripts/qapi-types.py
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$(call quiet-command,$(PYTHON) $(SRC_PATH)/scripts/qapi-types.py -o "." < $<, " GEN $@")
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$(call quiet-command,$(PYTHON) $(SRC_PATH)/scripts/qapi-types.py $(gen-out-type) -o "." < $<, " GEN $@")
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qapi-visit.c qapi-visit.h :\
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$(SRC_PATH)/qapi-schema.json $(SRC_PATH)/scripts/qapi-visit.py
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$(call quiet-command,$(PYTHON) $(SRC_PATH)/scripts/qapi-visit.py -o "." < $<, " GEN $@")
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$(call quiet-command,$(PYTHON) $(SRC_PATH)/scripts/qapi-visit.py $(gen-out-type) -o "." < $<, " GEN $@")
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qmp-commands.h qmp-marshal.c :\
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$(SRC_PATH)/qapi-schema.json $(SRC_PATH)/scripts/qapi-commands.py
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$(call quiet-command,$(PYTHON) $(SRC_PATH)/scripts/qapi-commands.py -m -o "." < $<, " GEN $@")
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$(call quiet-command,$(PYTHON) $(SRC_PATH)/scripts/qapi-commands.py $(gen-out-type) -m -o "." < $<, " GEN $@")
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test-qmp-output-visitor.o: $(addprefix $(qapi-dir)/, test-qapi-types.c test-qapi-types.h test-qapi-visit.c test-qapi-visit.h) $(qapi-obj-y)
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test-qmp-output-visitor: test-qmp-output-visitor.o $(qobject-obj-y) $(qapi-obj-y) $(tools-obj-y) $(qapi-dir)/test-qapi-visit.o $(qapi-dir)/test-qapi-types.o
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@ -372,7 +372,9 @@ def gen_command_def_prologue(prefix="", proxy=False):
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try:
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opts, args = getopt.gnu_getopt(sys.argv[1:], "p:o:m", ["prefix=", "output-dir=", "type=", "middle"])
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opts, args = getopt.gnu_getopt(sys.argv[1:], "chp:o:m",
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["source", "header", "prefix=",
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"output-dir=", "type=", "middle"])
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except getopt.GetoptError, err:
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print str(err)
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sys.exit(1)
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@ -384,6 +386,9 @@ c_file = 'qmp-marshal.c'
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h_file = 'qmp-commands.h'
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middle_mode = False
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do_c = False
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do_h = False
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for o, a in opts:
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if o in ("-p", "--prefix"):
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prefix = a
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@ -393,10 +398,29 @@ for o, a in opts:
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dispatch_type = a
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elif o in ("-m", "--middle"):
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middle_mode = True
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elif o in ("-c", "--source"):
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do_h = True
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elif o in ("-h", "--header"):
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do_c = True
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if not do_c and not do_h:
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do_c = True
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do_h = True
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c_file = output_dir + prefix + c_file
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h_file = output_dir + prefix + h_file
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def maybe_open(really, name, opt):
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class Null(object):
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def write(self, str):
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pass
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def read(self):
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return ''
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if really:
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return open(name, opt)
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else:
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return Null()
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try:
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os.makedirs(output_dir)
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except os.error, e:
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@ -408,8 +432,8 @@ commands = filter(lambda expr: expr.has_key('command'), exprs)
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commands = filter(lambda expr: not expr.has_key('gen'), commands)
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if dispatch_type == "sync":
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fdecl = open(h_file, 'w')
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fdef = open(c_file, 'w')
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fdecl = maybe_open(do_h, h_file, 'w')
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fdef = maybe_open(do_c, c_file, 'w')
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ret = gen_command_decl_prologue(header=basename(h_file), guard=guardname(h_file), prefix=prefix)
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fdecl.write(ret)
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ret = gen_command_def_prologue(prefix=prefix)
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@ -163,7 +163,8 @@ void qapi_free_%(type)s(%(c_type)s obj)
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try:
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opts, args = getopt.gnu_getopt(sys.argv[1:], "p:o:", ["prefix=", "output-dir="])
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opts, args = getopt.gnu_getopt(sys.argv[1:], "chp:o:",
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["source", "header", "prefix=", "output-dir="])
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except getopt.GetoptError, err:
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print str(err)
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sys.exit(1)
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@ -173,11 +174,22 @@ prefix = ""
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c_file = 'qapi-types.c'
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h_file = 'qapi-types.h'
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do_c = False
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do_h = False
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for o, a in opts:
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if o in ("-p", "--prefix"):
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prefix = a
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elif o in ("-o", "--output-dir"):
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output_dir = a + "/"
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elif o in ("-c", "--source"):
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do_h = True
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elif o in ("-h", "--header"):
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do_c = True
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if not do_c and not do_h:
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do_c = True
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do_h = True
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c_file = output_dir + prefix + c_file
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h_file = output_dir + prefix + h_file
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@ -188,8 +200,17 @@ except os.error, e:
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if e.errno != errno.EEXIST:
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raise
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fdef = open(c_file, 'w')
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fdecl = open(h_file, 'w')
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def maybe_open(really, name, opt):
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class Null(object):
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def write(self, str):
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pass
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def read(self):
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return ''
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if really:
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return open(name, opt)
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fdef = maybe_open(do_c, c_file, 'w')
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fdecl = maybe_open(do_h, h_file, 'w')
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fdef.write(mcgen('''
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/* AUTOMATICALLY GENERATED, DO NOT MODIFY */
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@ -139,7 +139,8 @@ void visit_type_%(name)s(Visitor *m, %(name)s * obj, const char *name, Error **e
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name=name)
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try:
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opts, args = getopt.gnu_getopt(sys.argv[1:], "p:o:", ["prefix=", "output-dir="])
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opts, args = getopt.gnu_getopt(sys.argv[1:], "chp:o:",
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["source", "header", "prefix=", "output-dir="])
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except getopt.GetoptError, err:
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print str(err)
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sys.exit(1)
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@ -149,11 +150,22 @@ prefix = ""
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c_file = 'qapi-visit.c'
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h_file = 'qapi-visit.h'
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do_c = False
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do_h = False
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for o, a in opts:
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if o in ("-p", "--prefix"):
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prefix = a
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elif o in ("-o", "--output-dir"):
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output_dir = a + "/"
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elif o in ("-c", "--source"):
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do_h = True
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elif o in ("-h", "--header"):
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do_c = True
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if not do_c and not do_h:
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do_c = True
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do_h = True
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c_file = output_dir + prefix + c_file
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h_file = output_dir + prefix + h_file
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@ -164,8 +176,17 @@ except os.error, e:
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if e.errno != errno.EEXIST:
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raise
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fdef = open(c_file, 'w')
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fdecl = open(h_file, 'w')
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def maybe_open(really, name, opt):
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class Null(object):
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def write(self, str):
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pass
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def read(self):
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return ''
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if really:
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return open(name, opt)
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fdef = maybe_open(do_c, c_file, 'w')
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fdecl = maybe_open(do_h, h_file, 'w')
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fdef.write(mcgen('''
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/* THIS FILE IS AUTOMATICALLY GENERATED, DO NOT MODIFY */
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