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Fixed an issue with pattern matching on enums
Fixed an issue whereby fix_early_returns would cause memory leaks
Added optimizations for some of the builtins used in the decode
function. Optimizations are turned on with the -O flag.
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Add support for short-ciruiting and/or. I forgot about this in the
original ANF specification and not having it causes problems for the
ARM spec.
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Now compiles to C and builds a working executable. Just need to
correctly implement all the library builtins (some are still stubs),
and it should work.
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Just need to implement builtins, fix-up a few re-write passes, and
integrate some kind of elf-loading and it should work.
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Turns out the __TakeColdReset function is actually in the v8.3 XML. I
went and looked for it, and it's there, it just wasn't being picked up
by ASL parser because it's not called from any instructions. I added a
new field to the json config files for ASL parser that can tell it
about any such special functions that it should guarantee to include.
Also fixed a bug in C loop compilation
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Goes through the C compiler without any errors, but as we still don't
have all the requisite builtins it won't actually produce an
executable. There are still a few things that don't work properly,
such as vectors of non-bit types - but once those are fixed and the
Sail library is implemented fully it should work.
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Describes precisely the intermediate representation used in the C
backend in an ott grammar, and also removes several C-isms where raw C
code was inserted into the IR, so in theory this IR could be
interpreted by a small VM/interpreter or compiled to LLVM bytecode
etc. Currently the I_raw constructor for inserting C code is just used
for inserting GCC attributes, so it can safely be ignored.
Also augment and refactor the instruction type with an aux constructor
so location information can be propagated down to this level.
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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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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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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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Also updated some of the documentation in the sail source code
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