1 files changed, 59 insertions, 0 deletions
diff --git a/compiler/Scalars.ml b/compiler/Scalars.ml
new file mode 100644
index 00000000..03ca506c
--- /dev/null
+++ b/compiler/Scalars.ml
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+open Types
+open Values
+
+(** The minimum/maximum values an integer type can have depending on its type *)
+
+let i8_min = Z.of_string "-128"
+let i8_max = Z.of_string "127"
+let i16_min = Z.of_string "-32768"
+let i16_max = Z.of_string "32767"
+let i32_min = Z.of_string "-2147483648"
+let i32_max = Z.of_string "2147483647"
+let i64_min = Z.of_string "-9223372036854775808"
+let i64_max = Z.of_string "9223372036854775807"
+let i128_min = Z.of_string "-170141183460469231731687303715884105728"
+let i128_max = Z.of_string "170141183460469231731687303715884105727"
+let u8_min = Z.of_string "0"
+let u8_max = Z.of_string "255"
+let u16_min = Z.of_string "0"
+let u16_max = Z.of_string "65535"
+let u32_min = Z.of_string "0"
+let u32_max = Z.of_string "4294967295"
+let u64_min = Z.of_string "0"
+let u64_max = Z.of_string "18446744073709551615"
+let u128_min = Z.of_string "0"
+let u128_max = Z.of_string "340282366920938463463374607431768211455"
+
+(** Being a bit conservative about isize/usize: depending on the system,
+    the values are encoded as 32-bit values or 64-bit values - we may
+    want to take that into account in the future *)
+
+let isize_min = i32_min
+let isize_max = i32_max
+let usize_min = u32_min
+let usize_max = u32_max
+
+(** Check that an integer value is in range *)
+let check_int_in_range (int_ty : integer_type) (i : big_int) : bool =
+  match int_ty with
+  | Isize -> Z.leq isize_min i && Z.leq i isize_max
+  | I8 -> Z.leq i8_min i && Z.leq i i8_max
+  | I16 -> Z.leq i16_min i && Z.leq i i16_max
+  | I32 -> Z.leq i32_min i && Z.leq i i32_max
+  | I64 -> Z.leq i64_min i && Z.leq i i64_max
+  | I128 -> Z.leq i128_min i && Z.leq i i128_max
+  | Usize -> Z.leq usize_min i && Z.leq i usize_max
+  | U8 -> Z.leq u8_min i && Z.leq i u8_max
+  | U16 -> Z.leq u16_min i && Z.leq i u16_max
+  | U32 -> Z.leq u32_min i && Z.leq i u32_max
+  | U64 -> Z.leq u64_min i && Z.leq i u64_max
+  | U128 -> Z.leq u128_min i && Z.leq i u128_max
+
+(** Check that a scalar value is correct (the integer value it contains is in range) *)
+let check_scalar_value_in_range (v : scalar_value) : bool =
+  check_int_in_range v.int_ty v.value
+
+(** Make a scalar value, while checking the value is in range *)
+let mk_scalar (int_ty : integer_type) (i : big_int) :
+    (scalar_value, unit) result =
+  if check_int_in_range int_ty i then Ok { value = i; int_ty } else Error ()