[Qemu-devel] [QAPI+QGA 2/3] QAPI code generation infrastructure v4

[Michael Roth <mdroth@linux.vnet.ibm.com>]

This is Set 2/3 of the QAPI+QGA patchsets.

These patches apply on top of master (set1 merged), and can also be obtained
from:
git://repo.or.cz/qemu/mdroth.git qapi-backport-set2-v4

(Set1+2 are a backport of some of the QAPI-related work from Anthony's
glib tree. The main goal is to get the basic code generation infrastructure in
place so that it can be used by the guest agent to implement a QMP-like guest
interface, and so that future work regarding the QMP conversion to QAPI can be
decoupled from the infrastructure bits. Set3 is the Qemu Guest Agent
(virtagent), rebased on the new code QAPI code generation infrastructure. This
is the first user of QAPI, QMP will follow.)
___

This patchset introduces the following:

 - Hard dependency on GLib. This has been floating around the list for a while.
   Currently the only users are the unit tests for this patchset and the guest
   agent. We can make both of these a configure option, but based on previous
   discussions a hard dependency will likely be introduced with subsequent
   QAPI patches.

 - A couple additional qlist utility functions used by QAPI.

 - QAPI schema-based code generation for synchronous QMP/QGA commands
   and types, and Visitor/dispatch infrastructure to handle
   marshaling/unmarshaling/dispatch between QAPI and the QMP/QGA wire protocols.

 - Documentation and unit tests for visitor functions and synchronous
   command/type generation.

CHANGES SINCE V3:
 - Added copyright headers for generated code and remaining files
 - Added checking for required/extra parameters in top-level of QMP QObject
 - Made QDict arg to input visitor constructor a const
 - Renamed qmp_dispatch_err() -> do_qmp_dispatch()
 - Changed QERR_QAPI_STACK_OVERRUN to QERR_BUFFER_OVERRUN
 - Moved configure changes to create QAPI directory when using a different build root to first patch which uses it.
 - Squashed Makefile changes for test-visitor/test-qmp-commands into single commits
 - Removed redundant NULL checks for qemu_free() in dealloc visitor

CHANGES SINCE V2:
 - Added cleanup functions for input/output visitor types and fixed a leak in
   dispatch path.
 - Corrected spelling from visiter->visitor and updated filenames accordingly.
 - Re-organized patches so that each new C file can be built as part of the
   introducting commit (for instances where there were no users of the
   qapi-obj-y target yet a test build was done by adding the target as a
   superficial dependency on other tools), and moved code generator patches
   after the required dependencies.
 - Made qlist_first/qlist_next accept/return const types.
 - Moved Visitor interface inline wrapper functions to real ones.
 - Fixed error-reporting for invalid parameters when parameter name is null.
 - Removed hard-coded size for QAPI-type allocations done by the input visitor,
   using generated code to pass in a sizeof() now.
 - Replaced assert()'s on visitor stack overruns, replaced with an error
   indication.
 - Fixed build issue when using a separate build directory.
 - Added missing copyright headers for scripts, moved external code in
   ordereddict.py to a seperate patch.
 - Many thanks to Luiz, Anthony, and everyone else for the excellent
   review/testing.

CHANGES SINCE V1:
 - Fixed build issue that was missed due to deprecated files being present in
   source tree. Thanks to Matsuda Daiki for sending fixes.
 - Fixed grammatical errors in documentation pointed out by Luiz.
 - Added generated code to the make clean target.

CHANGES SINCE V0 ("QAPI Infrastructure Round 1"):
 - Fixed known memory leaks in generated code
 - Stricter error-handling in generated code
 - Removed currently unused code (generators for events and async/proxied
   QMP/QGA commands and definition used by the not-yet-introduced QMP server
   replacement)
 - Added documentation for code generation scripts/schemas/usage
 - Addressed review comments from Luiz and Stefan

 Makefile                    |   24 +++-
 Makefile.objs               |    9 +
 Makefile.target             |    1 +
 configure                   |   14 ++
 docs/qapi-code-gen.txt      |  316 +++++++++++++++++++++++++++++++++++
 module.h                    |    2 +
 qapi-schema-test.json       |   22 +++
 qapi/qapi-dealloc-visitor.c |  138 ++++++++++++++++
 qapi/qapi-dealloc-visitor.h |   26 +++
 qapi/qapi-types-core.h      |   21 +++
 qapi/qapi-visit-core.c      |  114 +++++++++++++
 qapi/qapi-visit-core.h      |   68 ++++++++
 qapi/qmp-core.h             |   41 +++++
 qapi/qmp-dispatch.c         |  124 ++++++++++++++
 qapi/qmp-input-visitor.c    |  264 ++++++++++++++++++++++++++++++
 qapi/qmp-input-visitor.h    |   27 +++
 qapi/qmp-output-visitor.c   |  212 ++++++++++++++++++++++++
 qapi/qmp-output-visitor.h   |   28 +++
 qapi/qmp-registry.c         |   40 +++++
 qerror.h                    |    3 +
 qlist.h                     |   11 ++
 scripts/ordereddict.py      |  128 +++++++++++++++
 scripts/qapi-commands.py    |  381 +++++++++++++++++++++++++++++++++++++++++++
 scripts/qapi-types.py       |  258 +++++++++++++++++++++++++++++
 scripts/qapi-visit.py       |  261 +++++++++++++++++++++++++++++
 scripts/qapi.py             |  203 +++++++++++++++++++++++
 test-qmp-commands.c         |  113 +++++++++++++
 test-visitor.c              |  305 ++++++++++++++++++++++++++++++++++
 28 files changed, 3153 insertions(+), 1 deletions(-)