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Comment out some interpreter tests that go into infinite loops because
those will cause issues for Jenkins.
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Rather than having a separate variable for each backend X,
opt_print_X, just have a single variable opt_print_target, where
target contains a string option, such as `Some "lem"` or `Some
"ocaml"`, then we have a function target that takes that string and
invokes the appropriate backend, so the main function in sail.ml goes
from being a giant if-then-else block to a single call to
target !opt_target ast env
This allows us to implement a :compile <target> command in the
interactive toplevel
Also implement a :rewrites <target> command which performs all the
rewrites for a specific target, so rather than doing e.g.
> sail -c -O -o out $FILES
one could instead interactively do
> sail -i
:option -undefined_gen
:load $FILES
:option -O
:option -o out
:rewrites c
:compile c
:quit
for the same result.
To support this the behavior of the interactive mode has changed
slightly. It no longer performs any rewrites at all, so a :rewrites
interpreter is currently needed to interpret functions in the
interactive toplevel, nor does it automatically set any other flags,
so -undefined_gen is needed in this case, which is usually implied by
the -c flag.
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Also some pretty printer improvements
Make all the tests use the same colours for green/red/yellow
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Can now compile things like early returns. The same approach should
work for exception handling as well. Once that's in place, just need
to work a bit more on getting union types to work + the library of
builtins, then we should be able to compile and run some of our specs
via C. Also added some documentation in comments for the general
approach taken when compiling (need many more though).
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Currently the fix is to disallow this shadowing entirely, because it
seems to cause trouble for ocaml.
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New testcase for bitfield syntax
Updated to work with latest lem and linksem
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Also fixed basic ocaml test suite
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