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(which might not be present).
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Only check for availability of Lem library if actually trying to build
an Isabelle heap image.
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toolchain; use SAIL_RISCV instead to refer to sail-riscv.
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Since Isabelle 2018, specifying the same directory both on the command
line and persistently in the user's ROOTS file is allowed, so we don't
have to choose between one or the other any more.
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The datatype package of HOL4 does not support the prompt monad, so this patch
restores the option to generate a model that only uses the state monad. Also
add a Makefile target cheri_sequential.lem in the cheri/ directory.
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Some functions are partial, e.g. converting a bitvector to an integer, which
might fail for the bit list representation due to undefined bits. Undefined
cases can be handled in different ways:
- call Lem's failwith, which maps to undefined/ARB in Isabelle and HOL (the
default so far),
- return an option type,
- raise a failure in the monad, or
- use a bitstream oracle to resolve undefined bits.
This patch adds different versions of partial functions corresponding to those
options. The desired behaviour can be selected by choosing a binding in the
Sail prelude. The naming scheme is that the failwith version is the default,
while the other versions have the suffixes _maybe, _fail, and _oracle,
respectively.
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The suffix _lemmas is more descriptive than _extras.
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Generate only one Lem model based on the prompt monad (instead of two models
with different monads), and add a lifting from prompt to state monad. Add some
Isabelle lemmas about the monad lifting.
Also drop the "_embed" and "_sequential" suffixes from names of generated
files.
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- Use simplified monad type (e.g., without the with_aux constructors that are
not needed by the shallow embedding).
- Add support for registers with arbitrary types (e.g., records, enumerations,
vectors of vectors). Instead of using bit lists as the common representation
of register values at the monad interface, use a register_value type that is
generated per spec as a union of all register types that occur in the spec.
Conversion functions between register_value and concrete types are generated.
- Use the same representation of register references as the state monad, in
preparation of rebasing the state monad onto the prompt monad.
- Split out those types from sail_impl_base.lem that are used by the shallow
embedding into a new module sail_instr_kinds.lem, and import that. Removing
the dependency on Sail_impl_base from the shallow embedding avoids name clashes
between the different monad types.
Not yet done:
- Support for reading/writing register slices. Currently, a rewriting pass
pushes register slices in l-expressions to the right-hand side, turning a
write to a register slice into a read-modify-write. For interfacing with the
concurreny model, we will want to be more precise than that (in particular
since some specs represent register files as big single registers containing a
vector of bitvectors).
- Lemmas about the conversion functions to/from register_value should be
generated automatically.
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Makes bitvector typeclass instance dictionaries disappear from generated
Isabelle output.
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combinators)
Add Isabelle-specific theories imported directly after monad definitions, but
before other combinators. These theories contain lemmas that tell the function
package how to deal with monadic binds in function definitions.
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- Remove vector start indices
- Library refactoring: Definitions in sail_operators.lem now use Bitvector
type class and work for both bit list and machine word representations
- Add Lem bindings to AArch64 and RISC-V preludes
TODO: Merge specialised machine word operations from sail_operators_mwords into
sail_operators.
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