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https://gitlab.com/qemu-project/qemu
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qapi script: add event support
qapi-event.py will parse the schema and generate qapi-event.c, then the API in qapi-event.c can be used to handle events in qemu code. All API have prefix "qapi_event". The script mainly includes two parts: generate API for each event define, generate an enum type for all defined events. Since in some cases the real emit behavior may change, for example, qemu-img would not send a event, a callback layer is used to control the behavior. As a result, the stubs at compile time can be saved, the binding of block layer code and monitor code will become looser. Signed-off-by: Wenchao Xia <wenchaoqemu@gmail.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
This commit is contained in:
parent
f882126024
commit
21cd70dfc1
11
Makefile
11
Makefile
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@ -45,8 +45,8 @@ endif
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endif
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endif
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GENERATED_HEADERS = config-host.h qemu-options.def
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GENERATED_HEADERS = config-host.h qemu-options.def
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GENERATED_HEADERS += qmp-commands.h qapi-types.h qapi-visit.h
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GENERATED_HEADERS += qmp-commands.h qapi-types.h qapi-visit.h qapi-event.h
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GENERATED_SOURCES += qmp-marshal.c qapi-types.c qapi-visit.c
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GENERATED_SOURCES += qmp-marshal.c qapi-types.c qapi-visit.c qapi-event.c
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GENERATED_HEADERS += trace/generated-events.h
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GENERATED_HEADERS += trace/generated-events.h
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GENERATED_SOURCES += trace/generated-events.c
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GENERATED_SOURCES += trace/generated-events.c
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@ -202,7 +202,7 @@ Makefile: $(version-obj-y) $(version-lobj-y)
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# Build libraries
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# Build libraries
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libqemustub.a: $(stub-obj-y)
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libqemustub.a: $(stub-obj-y)
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libqemuutil.a: $(util-obj-y) qapi-types.o qapi-visit.o
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libqemuutil.a: $(util-obj-y) qapi-types.o qapi-visit.o qapi-event.o
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block-modules = $(foreach o,$(block-obj-m),"$(basename $(subst /,-,$o))",) NULL
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block-modules = $(foreach o,$(block-obj-m),"$(basename $(subst /,-,$o))",) NULL
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util/module.o-cflags = -D'CONFIG_BLOCK_MODULES=$(block-modules)'
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util/module.o-cflags = -D'CONFIG_BLOCK_MODULES=$(block-modules)'
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@ -259,6 +259,11 @@ $(qapi-modules) $(SRC_PATH)/scripts/qapi-visit.py $(qapi-py)
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$(call quiet-command,$(PYTHON) $(SRC_PATH)/scripts/qapi-visit.py \
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$(call quiet-command,$(PYTHON) $(SRC_PATH)/scripts/qapi-visit.py \
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$(gen-out-type) -o "." -b -i $<, \
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$(gen-out-type) -o "." -b -i $<, \
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" GEN $@")
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" GEN $@")
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qapi-event.c qapi-event.h :\
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$(qapi-modules) $(SRC_PATH)/scripts/qapi-event.py $(qapi-py)
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$(call quiet-command,$(PYTHON) $(SRC_PATH)/scripts/qapi-event.py \
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$(gen-out-type) -o "." -b -i $<, \
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" GEN $@")
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qmp-commands.h qmp-marshal.c :\
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qmp-commands.h qmp-marshal.c :\
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$(qapi-modules) $(SRC_PATH)/scripts/qapi-commands.py $(qapi-py)
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$(qapi-modules) $(SRC_PATH)/scripts/qapi-commands.py $(qapi-py)
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$(call quiet-command,$(PYTHON) $(SRC_PATH)/scripts/qapi-commands.py \
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$(call quiet-command,$(PYTHON) $(SRC_PATH)/scripts/qapi-commands.py \
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@ -12,7 +12,7 @@ block-obj-y += main-loop.o iohandler.o qemu-timer.o
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block-obj-$(CONFIG_POSIX) += aio-posix.o
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block-obj-$(CONFIG_POSIX) += aio-posix.o
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block-obj-$(CONFIG_WIN32) += aio-win32.o
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block-obj-$(CONFIG_WIN32) += aio-win32.o
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block-obj-y += block/
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block-obj-y += block/
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block-obj-y += qapi-types.o qapi-visit.o
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block-obj-y += qapi-types.o qapi-visit.o qapi-event.o
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block-obj-y += qemu-io-cmds.o
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block-obj-y += qemu-io-cmds.o
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block-obj-y += qemu-coroutine.o qemu-coroutine-lock.o qemu-coroutine-io.o
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block-obj-y += qemu-coroutine.o qemu-coroutine-lock.o qemu-coroutine-io.o
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@ -215,6 +215,24 @@ An example command is:
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'data': { 'arg1': 'str', '*arg2': 'str' },
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'data': { 'arg1': 'str', '*arg2': 'str' },
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'returns': 'str' }
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'returns': 'str' }
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=== Events ===
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Events are defined with the keyword 'event'. When 'data' is also specified,
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additional info will be carried on. Finally there will be C API generated
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in qapi-event.h; when called by QEMU code, a message with timestamp will
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be emitted on the wire. If timestamp is -1, it means failure to retrieve host
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time.
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An example event is:
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{ 'event': 'EVENT_C',
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'data': { '*a': 'int', 'b': 'str' } }
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Resulting in this JSON object:
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{ "event": "EVENT_C",
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"data": { "b": "test string" },
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"timestamp": { "seconds": 1267020223, "microseconds": 435656 } }
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== Code generation ==
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== Code generation ==
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369
scripts/qapi-event.py
Normal file
369
scripts/qapi-event.py
Normal file
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@ -0,0 +1,369 @@
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#
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# QAPI event generator
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#
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# Copyright (c) 2014 Wenchao Xia
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#
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# Authors:
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# Wenchao Xia <wenchaoqemu@gmail.com>
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#
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# This work is licensed under the terms of the GNU GPL, version 2.
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# See the COPYING file in the top-level directory.
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from ordereddict import OrderedDict
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from qapi import *
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import sys
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import os
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import getopt
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import errno
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def _generate_event_api_name(event_name, params):
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api_name = "void qapi_event_send_%s(" % c_fun(event_name).lower();
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l = len(api_name)
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if params:
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for argname, argentry, optional, structured in parse_args(params):
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if optional:
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api_name += "bool has_%s,\n" % c_var(argname)
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api_name += "".ljust(l)
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if argentry == "str":
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api_name += "const "
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api_name += "%s %s,\n" % (c_type(argentry), c_var(argname))
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api_name += "".ljust(l)
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api_name += "Error **errp)"
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return api_name;
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# Following are the core functions that generate C APIs to emit event.
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def generate_event_declaration(api_name):
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return mcgen('''
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%(api_name)s;
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''',
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api_name = api_name)
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def generate_event_implement(api_name, event_name, params):
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# step 1: declare any variables
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ret = mcgen("""
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%(api_name)s
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{
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QDict *qmp;
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Error *local_err = NULL;
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QMPEventFuncEmit emit;
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""",
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api_name = api_name)
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if params:
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ret += mcgen("""
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QmpOutputVisitor *qov;
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Visitor *v;
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QObject *obj;
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""")
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# step 2: check emit function, create a dict
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ret += mcgen("""
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emit = qmp_event_get_func_emit();
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if (!emit) {
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return;
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}
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qmp = qmp_event_build_dict("%(event_name)s");
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""",
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event_name = event_name)
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# step 3: visit the params if params != None
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if params:
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ret += mcgen("""
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qov = qmp_output_visitor_new();
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g_assert(qov);
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v = qmp_output_get_visitor(qov);
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g_assert(v);
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/* Fake visit, as if all members are under a structure */
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visit_start_struct(v, NULL, "", "%(event_name)s", 0, &local_err);
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if (local_err) {
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goto clean;
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}
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""",
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event_name = event_name)
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for argname, argentry, optional, structured in parse_args(params):
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if optional:
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ret += mcgen("""
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if (has_%(var)s) {
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""",
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var = c_var(argname))
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push_indent()
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if argentry == "str":
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var_type = "(char **)"
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else:
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var_type = ""
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ret += mcgen("""
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visit_type_%(type)s(v, %(var_type)s&%(var)s, "%(name)s", &local_err);
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if (local_err) {
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goto clean;
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}
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""",
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var_type = var_type,
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var = c_var(argname),
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type = type_name(argentry),
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name = argname)
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if optional:
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pop_indent()
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ret += mcgen("""
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}
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""")
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ret += mcgen("""
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visit_end_struct(v, &local_err);
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if (local_err) {
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goto clean;
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}
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obj = qmp_output_get_qobject(qov);
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g_assert(obj != NULL);
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qdict_put_obj(qmp, "data", obj);
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""")
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# step 4: call qmp event api
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ret += mcgen("""
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emit(%(event_enum_value)s, qmp, &local_err);
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""",
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event_enum_value = event_enum_value)
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# step 5: clean up
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if params:
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ret += mcgen("""
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clean:
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qmp_output_visitor_cleanup(qov);
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""")
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ret += mcgen("""
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error_propagate(errp, local_err);
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QDECREF(qmp);
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}
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""")
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return ret
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# Following are the functions that generate an enum type for all defined
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# events, similar to qapi-types.py. Here we already have enum name and
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# values which were generated before and recorded in event_enum_*. It also
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# works around the issue that "import qapi-types" can't work.
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def generate_event_enum_decl(event_enum_name, event_enum_values):
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lookup_decl = mcgen('''
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extern const char *%(event_enum_name)s_lookup[];
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''',
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event_enum_name = event_enum_name)
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enum_decl = mcgen('''
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typedef enum %(event_enum_name)s
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{
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''',
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event_enum_name = event_enum_name)
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# append automatically generated _MAX value
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enum_max_value = generate_enum_full_value(event_enum_name, "MAX")
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enum_values = event_enum_values + [ enum_max_value ]
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i = 0
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for value in enum_values:
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enum_decl += mcgen('''
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%(value)s = %(i)d,
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''',
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value = value,
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i = i)
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i += 1
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enum_decl += mcgen('''
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} %(event_enum_name)s;
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''',
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event_enum_name = event_enum_name)
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return lookup_decl + enum_decl
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def generate_event_enum_lookup(event_enum_name, event_enum_strings):
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ret = mcgen('''
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const char *%(event_enum_name)s_lookup[] = {
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''',
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event_enum_name = event_enum_name)
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i = 0
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for string in event_enum_strings:
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ret += mcgen('''
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"%(string)s",
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''',
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string = string)
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|
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ret += mcgen('''
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NULL,
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|
};
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''')
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return ret
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# Start the real job
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try:
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opts, args = getopt.gnu_getopt(sys.argv[1:], "chbp:i:o:",
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["source", "header", "builtins", "prefix=",
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"input-file=", "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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|
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|
input_file = ""
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|
output_dir = ""
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|
prefix = ""
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c_file = 'qapi-event.c'
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h_file = 'qapi-event.h'
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|
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|
do_c = False
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do_h = False
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|
do_builtins = 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 ("-i", "--input-file"):
|
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|
input_file = a
|
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|
elif o in ("-o", "--output-dir"):
|
||||||
|
output_dir = a + "/"
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|
elif o in ("-c", "--source"):
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|
do_c = True
|
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|
elif o in ("-h", "--header"):
|
||||||
|
do_h = True
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|
elif o in ("-b", "--builtins"):
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|
do_builtins = 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
|
||||||
|
|
||||||
|
c_file = output_dir + prefix + c_file
|
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|
h_file = output_dir + prefix + h_file
|
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|
|
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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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|
if e.errno != errno.EEXIST:
|
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|
raise
|
||||||
|
|
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|
def maybe_open(really, name, opt):
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|
if really:
|
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|
return open(name, opt)
|
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|
else:
|
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|
import StringIO
|
||||||
|
return StringIO.StringIO()
|
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|
|
||||||
|
fdef = maybe_open(do_c, c_file, 'w')
|
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|
fdecl = maybe_open(do_h, h_file, 'w')
|
||||||
|
|
||||||
|
fdef.write(mcgen('''
|
||||||
|
/* THIS FILE IS AUTOMATICALLY GENERATED, DO NOT MODIFY */
|
||||||
|
|
||||||
|
/*
|
||||||
|
* schema-defined QAPI event functions
|
||||||
|
*
|
||||||
|
* Copyright (c) 2014 Wenchao Xia
|
||||||
|
*
|
||||||
|
* Authors:
|
||||||
|
* Wenchao Xia <wenchaoqemu@gmail.com>
|
||||||
|
*
|
||||||
|
* This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
|
||||||
|
* See the COPYING.LIB file in the top-level directory.
|
||||||
|
*
|
||||||
|
*/
|
||||||
|
|
||||||
|
#include "qemu-common.h"
|
||||||
|
#include "%(header)s"
|
||||||
|
#include "%(prefix)sqapi-visit.h"
|
||||||
|
#include "qapi/qmp-output-visitor.h"
|
||||||
|
#include "qapi/qmp-event.h"
|
||||||
|
|
||||||
|
''',
|
||||||
|
prefix=prefix, header=basename(h_file)))
|
||||||
|
|
||||||
|
fdecl.write(mcgen('''
|
||||||
|
/* THIS FILE IS AUTOMATICALLY GENERATED, DO NOT MODIFY */
|
||||||
|
|
||||||
|
/*
|
||||||
|
* schema-defined QAPI event functions
|
||||||
|
*
|
||||||
|
* Copyright (c) 2014 Wenchao Xia
|
||||||
|
*
|
||||||
|
* Authors:
|
||||||
|
* Wenchao Xia <wenchaoqemu@gmail.com>
|
||||||
|
*
|
||||||
|
* This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
|
||||||
|
* See the COPYING.LIB file in the top-level directory.
|
||||||
|
*
|
||||||
|
*/
|
||||||
|
|
||||||
|
#ifndef %(guard)s
|
||||||
|
#define %(guard)s
|
||||||
|
|
||||||
|
#include "qapi/error.h"
|
||||||
|
#include "qapi/qmp/qdict.h"
|
||||||
|
#include "%(prefix)sqapi-types.h"
|
||||||
|
|
||||||
|
''',
|
||||||
|
prefix=prefix, guard=guardname(h_file)))
|
||||||
|
|
||||||
|
exprs = parse_schema(input_file)
|
||||||
|
|
||||||
|
event_enum_name = prefix.upper().replace('-', '_') + "QAPIEvent"
|
||||||
|
event_enum_values = []
|
||||||
|
event_enum_strings = []
|
||||||
|
|
||||||
|
for expr in exprs:
|
||||||
|
if expr.has_key('event'):
|
||||||
|
event_name = expr['event']
|
||||||
|
params = expr.get('data')
|
||||||
|
if params and len(params) == 0:
|
||||||
|
params = None
|
||||||
|
|
||||||
|
api_name = _generate_event_api_name(event_name, params)
|
||||||
|
ret = generate_event_declaration(api_name)
|
||||||
|
fdecl.write(ret)
|
||||||
|
|
||||||
|
# We need an enum value per event
|
||||||
|
event_enum_value = generate_enum_full_value(event_enum_name,
|
||||||
|
event_name)
|
||||||
|
ret = generate_event_implement(api_name, event_name, params)
|
||||||
|
fdef.write(ret)
|
||||||
|
|
||||||
|
# Record it, and generate enum later
|
||||||
|
event_enum_values.append(event_enum_value)
|
||||||
|
event_enum_strings.append(event_name)
|
||||||
|
|
||||||
|
ret = generate_event_enum_decl(event_enum_name, event_enum_values)
|
||||||
|
fdecl.write(ret)
|
||||||
|
ret = generate_event_enum_lookup(event_enum_name, event_enum_strings)
|
||||||
|
fdef.write(ret)
|
||||||
|
|
||||||
|
fdecl.write('''
|
||||||
|
#endif
|
||||||
|
''')
|
||||||
|
|
||||||
|
fdecl.flush()
|
||||||
|
fdecl.close()
|
||||||
|
|
||||||
|
fdef.flush()
|
||||||
|
fdef.close()
|
|
@ -248,6 +248,16 @@ def discriminator_find_enum_define(expr):
|
||||||
|
|
||||||
return find_enum(discriminator_type)
|
return find_enum(discriminator_type)
|
||||||
|
|
||||||
|
def check_event(expr, expr_info):
|
||||||
|
params = expr.get('data')
|
||||||
|
if params:
|
||||||
|
for argname, argentry, optional, structured in parse_args(params):
|
||||||
|
if structured:
|
||||||
|
raise QAPIExprError(expr_info,
|
||||||
|
"Nested structure define in event is not "
|
||||||
|
"supported now, event '%s', argname '%s'"
|
||||||
|
% (expr['event'], argname))
|
||||||
|
|
||||||
def check_union(expr, expr_info):
|
def check_union(expr, expr_info):
|
||||||
name = expr['union']
|
name = expr['union']
|
||||||
base = expr.get('base')
|
base = expr.get('base')
|
||||||
|
@ -311,6 +321,8 @@ def check_exprs(schema):
|
||||||
expr = expr_elem['expr']
|
expr = expr_elem['expr']
|
||||||
if expr.has_key('union'):
|
if expr.has_key('union'):
|
||||||
check_union(expr, expr_elem['info'])
|
check_union(expr, expr_elem['info'])
|
||||||
|
if expr.has_key('event'):
|
||||||
|
check_event(expr, expr_elem['info'])
|
||||||
|
|
||||||
def parse_schema(input_file):
|
def parse_schema(input_file):
|
||||||
try:
|
try:
|
||||||
|
|
|
@ -199,7 +199,7 @@ check-qapi-schema-y := $(addprefix tests/qapi-schema/, \
|
||||||
include-simple.json include-relpath.json include-format-err.json \
|
include-simple.json include-relpath.json include-format-err.json \
|
||||||
include-non-file.json include-no-file.json include-before-err.json \
|
include-non-file.json include-no-file.json include-before-err.json \
|
||||||
include-nested-err.json include-self-cycle.json include-cycle.json \
|
include-nested-err.json include-self-cycle.json include-cycle.json \
|
||||||
include-repetition.json)
|
include-repetition.json event-nest-struct.json)
|
||||||
|
|
||||||
GENERATED_HEADERS += tests/test-qapi-types.h tests/test-qapi-visit.h tests/test-qmp-commands.h
|
GENERATED_HEADERS += tests/test-qapi-types.h tests/test-qapi-visit.h tests/test-qmp-commands.h
|
||||||
|
|
||||||
|
|
1
tests/qapi-schema/event-nest-struct.err
Normal file
1
tests/qapi-schema/event-nest-struct.err
Normal file
|
@ -0,0 +1 @@
|
||||||
|
tests/qapi-schema/event-nest-struct.json:1: Nested structure define in event is not supported now, event 'EVENT_A', argname 'a'
|
1
tests/qapi-schema/event-nest-struct.exit
Normal file
1
tests/qapi-schema/event-nest-struct.exit
Normal file
|
@ -0,0 +1 @@
|
||||||
|
1
|
2
tests/qapi-schema/event-nest-struct.json
Normal file
2
tests/qapi-schema/event-nest-struct.json
Normal file
|
@ -0,0 +1,2 @@
|
||||||
|
{ 'event': 'EVENT_A',
|
||||||
|
'data': { 'a' : { 'string' : 'str', 'integer': 'int' }, 'b' : 'str' } }
|
0
tests/qapi-schema/event-nest-struct.out
Normal file
0
tests/qapi-schema/event-nest-struct.out
Normal file
Loading…
Reference in a new issue