Improve builtins tests

Test the builtin functions by compiling them to C, OCaml, and OCaml
via Lem. Split up some of the longer builtin test programs to avoid
stack overflows when compiling to OCaml, as 3000+ line long blocks can
cause issues with some re-writing steps.

Also test constant-folding with builtins (this should reduce the
asserts in these files to assert true), and also test constant folding
with the C compilation.

Fix a bug whereby vectors with heap-allocated elements were not
initialized correctly.

Fix a bug caused by compiling and optimising empty vector literals.

Fix an OCaml test case that broke due to the ref type being used. Now
uses references to registers.

Fix a bug where Sail would output big integers that lem can't
parse. Checks if integer is between Int32.min_int and Int32.max_int
and if not, use integerOfString to represent the integer. Really this
should be fixed in Lem.

Make the python test runner script the default for testing builtins
and running the C compilation tests in test/run_tests.sh

Add a ocaml_build_dir option that sets a custom build directory for
OCaml. This is needed for running OCaml tests in parallel so the
builds don't clobber one another.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/bytecode_util.ml b/src/bytecode_util.ml
index 3e674cfd..fa41e1e1 100644
--- a/src/bytecode_util.ml
+++ b/src/bytecode_util.ml
@@ -136,6 +136,7 @@ let rec frag_rename from_id to_id = function
 (**************************************************************************)
 
 let string_of_value = function
+  | V_bits [] -> "UINT64_C(0)"
   | V_bits bs -> "UINT64_C(" ^ Sail2_values.show_bitlist bs ^ ")"
   | V_int i -> Big_int.to_string i ^ "l"
   | V_bool true -> "true"