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Also fixes to C backend for compiling MIPS spec to C
- Fix an issue with const correctness in internal_vector_update
functions generated by C backend
- Add builtins for MIPS to sail.h
- Fix an issue where reg_deref didn't work when called on pointers to
large bitvectors, i.e. vectors containing references to large
bitfields as in the MIPS TLB code
- Various bug fixes and changes for running U-boot on ARM model,
including for interpreter and OCaml compilation.
- Fix memory leak issues and incorrect shadowing for foreach loops
- Update C header file. Fixes memory leak in memory read/write
builtins.
- Add aux constructor to ANF representation to hold environment
information.
- Fix undefined behavior caused by optimisation left shifting uint64_t
vectors 64 or more times. Unfortunately there's more issues because
the same happens for X >> 64 right shifts. It would make sense for
this to be zero, because that would guarantee the property that ((X
>> n) >> m) == (X >> (n + m)) but we probably need to do (X >> (n -
1) >> 1) in the optimisation to ensure that we don't cause
UB. Shifting by 63 and then by 1 is well-defined, but shifting by 64
in one go isn't according to the C standard. This issue with
right-shifts only occurs for zero-length vectors, so it's not a huge
deal, but it's still annoying.
- Add versions of print_bits and print_int that print to
stderr. Follows OCaml convention of print/prerr. Should make things
more explicit. Different backends had different ideas about where
print should output to, not every backend needs to have this
(e.g. theorem prover backends don't need to print) but having both
stderr and stdout seperate and clear is useful for executable models
(UART needs to be stdout, debug messages should be stderr).
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Added option -latex that outputs input to a latex document.
Added doc comments that can be attached to certain AST nodes - right now just valspecs and function clauses, e.g.
/*!
Documentation for main
*/
val main : unit -> unit
These comments are kept by the sail pretty printer, and used when generating latex
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Rather than just using strings to represent literals, now use value
types from sail_lib.lem to represent them. This allows for expressions
to be evaluated at compile time, which will be useful for future
optimisations involving constant folding and propagation, and allows
the intermediate bytecode to be interpreted using the same lem
builtins that the shallow embedding uses.
To get this to work I had to tweak the build process slightly to allow
ml files to import lem files from gen_lib/. Hopefully this doesn't
break anything!
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Option -ddump_flow_graphs when used with -c will create graphviz files
for each function in the specification with control and data
dependencies shown.
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Gives warnings when pattern matches are incomplete, when matches are
redundant (in certain cases), or when no unguarded patterns exist. For
example the following file:
enum Test = {A, C, D}
val test1 : Test -> string
function test1 x =
match x {
A => "match A",
B => "this will match anything, because B is unbound!",
C => "match C",
D => "match D"
}
val test2 : Test -> string
function test2 x =
match x {
A => "match A",
C => "match C"
/* No match for D */
}
val test3 : Test -> string
function test3 x =
match x {
A if false => "never match A",
C => "match C",
D => "match D"
}
val test4 : Test -> string
function test4 x =
match x {
A if true => "match A",
C if true => "match C",
D if true => "match D"
}
will produce the following warnings
Warning: Possible redundant pattern match at file "test.sail", line 10, character 5 to line 10, character 5
C => "match C",
Warning: Possible redundant pattern match at file "test.sail", line 11, character 5 to line 11, character 5
D => "match D"
Warning: Possible incomplete pattern match at file "test.sail", line 17, character 3 to line 17, character 7
match x {
Most general matched pattern is A_|C_
Warning: Possible incomplete pattern match at file "test.sail", line 26, character 3 to line 26, character 7
match x {
Most general matched pattern is C_|D_
Warning: No non-guarded patterns at file "test.sail", line 35, character 3 to line 35, character 7
match x {
warnings can be turned of with the -no_warn flag.
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Can now use C-style include declarations to include files within other sail files. This is done in such a way that all the location information is preserved in error messages. As an example:
$include "aarch64/prelude.sail"
$define SYM
$ifndef SYM
$include <../util.sail>
$endif
would include the file aarch64/prelude.sail relative to the file where the include is contained. It then defines a symbol SYM and includes another file if it is not defined. The <../util.sail> include will be accessed relative to $SAIL_DIR/lib, so $SAIL_DIR/lib/../util.sail in this case.
This can be used with the standard C trick of
$ifndef ONCE
$define ONCE
val f : unit -> unit
$endif
so no matter how many sail files include the above file, the valspec for f will only appear once.
Currently we just have $include, $define, $ifdef and $ifndef (with $else and $endif). We're using $ rather than # because # is already used in internal identifiers, although this could be switched.
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Also updated some of the documentation in the sail source code
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This removes all type polymorphism, so we can generate optimized
bitvector code and compile to languages without parametric
polymorphism.
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Experimenting with porting riscv model to new typechecker
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imported new version of PPrint (20171003)
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Requires linenoise library (opam install linenoise) for readline
support. Use 'make isail' to build sail with interactive
support. Plain 'make sail' should work as before with no additional
dependencies.
Use 'sail -i <commands>' to run sail interactively, e.g.
sail -new_parser -i test/ocaml/prelude.sail test/ocaml/trycatch/tc.sail
then try some commands for typechecking and evaluation
sail> :t main
sail> main ()
Doesn't use the lem interpreter right now, instead has a small
operational semantics in src/interpreter.ml, but this is not very
complete and will be changed/removed.
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Now constraints on type constructors are checked correctly when
checking that types are well formed using Env.wf_typ. The arity and
kind of type constructor arguments are also checked in the same way.
Also some general cleanups to the type checker code, with some
auxillary functions being moved to more appropriate files.
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For example,
val test = { ocaml: "test_ocaml" } : unit -> unit
will only be external for OCaml. For other backends, it will have to be
defined.
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- Support tuples in lexps
- Rewrite trivial sizeofs
- Rewrite early returns more aggressively
- Support let bindings with ticked variables (binding both a type-level and
term-level variable at the same time)
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Can now handle nexps such as (2**65 - 1). Uses big_ints for comparisons, and
keeps original nexps in the AST.
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sail.ml
Current REMS install script and Jenkins CI server is on an older ocaml
which doesn't have this function in String.
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Note: the resulting Lem file generated may or may not actually work properly with the interpreter (i.e. it might have too many unknowns); still in the process of debugging some changes there.
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representation of types to support unification; importing support modules from Lem including pp and util
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