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In QAPI, absent optional members are distinct from any present value. We thus represent an optional schema member FOO as two C members: a FOO with the member's type, and a bool has_FOO. Likewise for function arguments. However, has_FOO is actually redundant for a pointer-valued FOO, which can be null only when has_FOO is false, i.e. has_FOO == !!FOO. Except for arrays, where we a null FOO can also be a present empty array. The redundant has_FOO are a nuisance to work with. Improve the generator to elide them. Uses of has_FOO need to be replaced as follows. Tests of has_FOO become the equivalent comparison of FOO with null. For brevity, this is commonly done by implicit conversion to bool. Assignments to has_FOO get dropped. Likewise for arguments to has_FOO parameters. Beware: code may violate the invariant has_FOO == !!FOO before the transformation, and get away with it. The above transformation can then break things. Two cases: * Absent: if code ignores FOO entirely when !has_FOO (except for freeing it if necessary), even non-null / uninitialized FOO works. Such code is known to exist. * Present: if code ignores FOO entirely when has_FOO, even null FOO works. Such code should not exist. In both cases, replacing tests of has_FOO by FOO reverts their sense. We have to fix the value of FOO then. To facilitate review of the necessary updates to handwritten code, add means to opt out of this change, and opt out for all QAPI schema modules where the change requires updates to handwritten code. The next few commits will remove these opt-outs in reviewable chunks, then drop the means to opt out. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Message-Id: <20221104160712.3005652-5-armbru@redhat.com> |
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| .. | ||
| _templates | ||
| about | ||
| config | ||
| devel | ||
| interop | ||
| specs | ||
| sphinx | ||
| sphinx-static | ||
| spin | ||
| system | ||
| tools | ||
| user | ||
| block-replication.txt | ||
| bypass-iommu.txt | ||
| COLO-FT.txt | ||
| colo-proxy.txt | ||
| conf.py | ||
| defs.rst.inc | ||
| igd-assign.txt | ||
| image-fuzzer.txt | ||
| index.rst | ||
| memory-hotplug.txt | ||
| meson.build | ||
| multi-thread-compression.txt | ||
| multiseat.txt | ||
| nvdimm.txt | ||
| pci_expander_bridge.txt | ||
| pcie_pci_bridge.txt | ||
| pcie_sriov.txt | ||
| pcie.txt | ||
| pvrdma.txt | ||
| qcow2-cache.txt | ||
| qdev-device-use.txt | ||
| qemu-option-trace.rst.inc | ||
| qemupciserial.inf | ||
| rdma.txt | ||
| spice-port-fqdn.txt | ||
| throttle.txt | ||
| u2f.txt | ||
| xbzrle.txt | ||
| xen-save-devices-state.txt | ||