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|
default Order dec
$include <flow.sail>
$include <arith.sail>
$include <vector_dec.sail>
$include <string.sail>
$include <exception_basic.sail>
val highest_set_bit : forall ('n : Int), 'n >= 0. bits('n) -> int
overload ~ = {not_bool}
function highest_set_bit x = {
foreach (i from ('n - 1) to 0 by 1 in dec)
if x[i] == bitone then return(i) else ();
return -1
}
val throws : unit -> unit effect {escape}
function throws() = throw Exception()
register R : int
/*
* Modelling bug described in commit 45554f2893667d951e39c8049631a986c1683857
*/
val fetch_and_execute : unit -> bool effect {escape, wreg, rreg}
function fetch_and_execute() =
{
R = R + 1;
try {
if (R >= 3) then {
throws()
};
true
} catch {
Exception() => false
}
}
val main : unit -> unit effect {escape, wreg, rreg}
function main() =
{
R = 0;
/*
* Expect: "i = 1", "i = 2" and "i = 3"
*/
foreach (i from 1 to 3) {
print_int("i = ", i)
};
/*
* Expect: "i = 3", "i = 2" and "i = 1"
*/
foreach (i from 3 to 1 by 1 in dec) {
print_int("i = ", i)
};
assert(highest_set_bit(0b1) == 0);
assert(highest_set_bit(0b0010) == 1);
assert(highest_set_bit(0b10000) == 4);
assert(highest_set_bit(0x8000_0000_0000_0000) == 63);
assert(highest_set_bit(0x1_0000_0000_0000_0000) == 64);
/*
* Expect: "j = 1", "j = 2" and "j = 3"
*/
j : int = 0;
while j < 3 do {
j = j + 1;
print_int("j = ", j);
};
/*
* Expect: "k = 0x01", "k = 0x02" and "k = 0x03"
*/
k : bits(8) = 0x00;
while unsigned(k) < 3 do {
k = k + 1;
print_bits("k = ", k);
};
/*
* Expect: "Caught"
*/
try {
while true do {
throw Exception();
assert(false, "Unreachable")
}
} catch {
Exception() => print_endline("Caught")
};
/*
* Expect: "Looping"
*/
caught : bool = false;
while ~(caught) do {
try {
print_endline("Looping");
throw Exception();
assert(false, "Unreachable")
} catch {
Exception() => caught = true
}
};
/*
* Expect "Caught inner exception", "Caught outer exception"
*/
try {
try throw Exception()
catch {
Exception() => {
print_endline("Caught inner exception");
throw Exception()
}
}
} catch {
Exception() => print_endline("Caught outer exception")
};
/*
* Expect "Outer handler"
*/
try {
try throw Exception()
catch {
/* Exception in catch guard will throw to outer handler */
Exception() if { throw Exception(); false } => {
assert(false, "Unreachable");
throw Exception()
},
_ => assert(false, "Unreachable")
}
} catch {
Exception() => print_endline("Outer handler")
};
/*
* Expect "Outer handler"
*/
try {
try throws()
catch {
/* Exception in catch guard will throw to outer handler */
Exception() if { throws(); true } => {
assert(false, "Unreachable");
throws()
},
_ => assert(false, "Unreachable")
}
} catch {
Exception() => print_endline("Outer handler")
};
/*
* Expect "Once"
*/
repeat {
print_endline("Once")
} until true;
/*
* Expect "Once"
*/
once : bool = false;
repeat {
print_endline("Once");
try throw Exception() catch {
_ => once = true,
_ => once = false
}
} until once;
/*
* Expect "ok"
*/
if try true catch { _ => false } then {
print_endline("ok")
};
/*
* Expect "ok"
*/
if try throw Exception() catch { _ => true } then {
print_endline("ok")
};
/*
* Expect "R = 3"
*/
while fetch_and_execute() do ();
print_int("R = ", R);
}
|
