This commit introduces a `Kind` for arguments described in
`FunctionType::Layout`. We nowe basically have three types of arguments:
* Scalar: a regular scarlar argument;
* ReferenceToAggregate: a reference to an aggregete argument on the
stack;
* ShadowPointerToAggregateReturnValue: a pointer to the storage for the
(aggregate) return value allocated by the caller;
This commit completes the support of various rare PrimitiveTypes, that
has been added opportunistically over time and has remained inconsistent
across the codebase:
- float80_t
- float96_t
- generic80_t
- generic96_t
The first two are necessary because on some platforms long double is
either 10 or 12 bytes wide.
The second two are necessary because the Generic PrimitiveType should
allow all non-zero byte sizes allowed by any other PrimitiveType.
The architecture-specific pointer (generic register) size is used
instead.
For all the ABIs we support the value of this parameter was already
set to its pointer size. We might need to reintroduce the parameter
in the future if we want to support a super-exotic ABI with different
stack alignment requirements, but that seems highly unlikely.
This also introduces the argument extension helper for one stop all
treating small arguments when they are put into a register or pushed
into the stack.
FunctionMetadata was being deserialized every time they were
inspected. This commit introduces a cache structure to prevent this
excessive deserializations.
Instruction definition tags are now generated as a 0-size anchor on
the LHS of the text of the actual instruction, this is to prevent
a potential user asking for the definition/reference of the single
instruction.
Handle crashes via signal handlers. Switch python's revng.api from
a normal python function to faulthandler, which works also in the
case of harsher interruptions (e.g. SIGABRT).
PromteCSVs creates wrappers around helpers. These helpers used to return
a struct in case the helper was changing a CSV.
In order to simplify the downstream pipeline, we now use out arguments
instead of returning a struct.
Massimo Fioravanti