1 files changed, 110 insertions, 0 deletions
diff --git a/src/Scalars.ml b/src/Scalars.ml
new file mode 100644
index 00000000..29c2779f
--- /dev/null
+++ b/src/Scalars.ml
@@ -0,0 +1,110 @@
+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
+
+(** Return the integer value in a scalar value *)
+let scalar_value_get_value (v : scalar_value) : big_int =
+  match v with
+  | Isize i -> i
+  | I8 i -> i
+  | I16 i -> i
+  | I32 i -> i
+  | I64 i -> i
+  | I128 i -> i
+  | Usize i -> i
+  | U8 i -> i
+  | U16 i -> i
+  | U32 i -> i
+  | U64 i -> i
+  | U128 i -> i
+
+(** Retrieve the [integer_type] of a scalar value *)
+let scalar_value_get_integer_type (sv : scalar_value) : integer_type =
+  match sv with
+  | Isize _ -> Types.Isize
+  | I8 _ -> Types.I8
+  | I16 _ -> Types.I16
+  | I32 _ -> Types.I32
+  | I64 _ -> Types.I64
+  | I128 _ -> Types.I128
+  | Usize _ -> Types.Usize
+  | U8 _ -> Types.U8
+  | U16 _ -> Types.U16
+  | U32 _ -> Types.U32
+  | U64 _ -> Types.U64
+  | U128 _ -> Types.U128
+
+(** 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 =
+  let i = scalar_value_get_value v in
+  let int_ty = scalar_value_get_integer_type v in
+  check_int_in_range int_ty i