Add Bool and Char addressing modes

This commit adds addressing modes for boolean and character data.
The Address enum is extended, along with its TryFrom<u8> implementation
and its operand_size function. The access macro is extended to handle
the new modes. The CONST instruction can now create Char and Bool data.
The instructions.toml has information on the new addressing modes. Unit
tests have been added to test new CONST logic.

fixes: #41

Signed-off-by: Ava Affine <ava@sunnypup.io>

hyphae/instructions.toml

@@ -1,6 +1,3 @@
-# NOTE: keep libc out of this, thats what trap vector is for
-# NOTE: to programmers: only registers allow mutable acess
-
 [[addressing_modes]]
 name = "expr"
 mutable = true
@@ -36,6 +33,20 @@ symbol = "N"
 example = "const $expr, 100"
 description = "Numeric addressing mode provides read only integer constants to instructions"
 
+[[addressing_modes]]
+name = "char"
+mutable = false
+symbol = "'N'"
+example = "const $expr, 'c'"
+description = "Char addressing mode provides read only character constants to instructions"
+
+[[addressing_modes]]
+name = "boolean"
+mutable = false
+symbol = "{true|false}"
+example = "const $expr, true"
+description = "Boolean addressing mode provides read only booleans to instructions"
+
 [[instructions]]
 name = "trap"
 args = ["index"]

hyphae/src/util.rs

@@ -26,14 +26,16 @@ use core::mem::transmute;
 #[repr(u8)]
 #[derive(Debug, Clone, PartialEq)]
 pub enum Address {
-    Stack = 0xf0, // immutable access only
-    Instr = 0xf1, // immutable access only
-    Expr  = 0xf2, // mutable access allowed
-    Oper1 = 0xf3, // mutable access allowed
-    Oper2 = 0xf4, // mutable access allowed
-    Oper3 = 0xf5, // mutable access allowed
-    Oper4 = 0xf6, // mutable access allowed
-    Numer = 0xf8, // immutable access only
+    Stack  = 0xf0, // immutable access only
+    Instr  = 0xf1, // immutable access only
+    Expr   = 0xf2, // mutable access allowed
+    Oper1  = 0xf3, // mutable access allowed
+    Oper2  = 0xf4, // mutable access allowed
+    Oper3  = 0xf5, // mutable access allowed
+    Oper4  = 0xf6, // mutable access allowed
+    Numer  = 0xf8, // immutable access only
+    Bool   = 0xf9, // immutable access only
+    Char   = 0xfa, // immutable access only
 }
 
 #[derive(Debug, Clone, PartialEq)]
@@ -55,14 +57,16 @@ impl TryFrom<u8> for Address {
     type Error = &'static str;
     fn try_from(val: u8) -> Result<Self, Self::Error> {
         match val {
-            _ if val == Address::Stack as u8 => Ok(Address::Stack),
-            _ if val == Address::Instr as u8 => Ok(Address::Instr),
-            _ if val == Address::Expr  as u8 => Ok(Address::Expr),
-            _ if val == Address::Oper1 as u8 => Ok(Address::Oper1),
-            _ if val == Address::Oper2 as u8 => Ok(Address::Oper2),
-            _ if val == Address::Oper3 as u8 => Ok(Address::Oper3),
-            _ if val == Address::Oper4 as u8 => Ok(Address::Oper4),
-            _ if val == Address::Numer as u8 => Ok(Address::Numer),
+            _ if val == Address::Stack  as u8 => Ok(Address::Stack),
+            _ if val == Address::Instr  as u8 => Ok(Address::Instr),
+            _ if val == Address::Expr   as u8 => Ok(Address::Expr),
+            _ if val == Address::Oper1  as u8 => Ok(Address::Oper1),
+            _ if val == Address::Oper2  as u8 => Ok(Address::Oper2),
+            _ if val == Address::Oper3  as u8 => Ok(Address::Oper3),
+            _ if val == Address::Oper4  as u8 => Ok(Address::Oper4),
+            _ if val == Address::Numer  as u8 => Ok(Address::Numer),
+            _ if val == Address::Bool   as u8 => Ok(Address::Bool),
+            _ if val == Address::Char   as u8 => Ok(Address::Char),
             _ => Err("illegal addressing mode")
         }
     }
@@ -74,6 +78,8 @@ impl Address {
             Address::Stack => (usize::BITS / 8) as u8,
             Address::Instr => (usize::BITS / 8) as u8,
             Address::Numer => (usize::BITS / 8) as u8,
+            Address::Bool  => 1,
+            Address::Char  => 1,
             _ => 0,
         }
     }

hyphae/src/vm.rs

@@ -170,6 +170,8 @@ impl VM {
                     Address::Oper4 => &self.oper[3],
                     Address::Stack => &self.stack[$oper.1],
                     Address::Numer => e!("cannot access constant numeric data"),
+                    Address::Char  => e!("cannot access constant char data"),
+                    Address::Bool  => e!("cannot access constant bool data"),
                     Address::Instr => e!("bad access to instruction data"),
                 }
             };
@@ -405,11 +407,14 @@ impl VM {
             },
 
             i::CONST => access!(&instr.1[0], {
-                let Operand(Address::Numer, num) = instr.1[1] else {
-                    e!("illegal argument to CONST instruction");
-                };
-
-                Datum::Number(Number::Fra(Fraction(num as isize, 1))).into()
+                match instr.1[1].0 {
+                    Address::Numer =>
+                        Datum::Number(Number::Fra(Fraction(instr.1[1].1 as isize, 1)))
+                            .into(),
+                    Address::Bool => Datum::Bool(instr.1[1].1 > 0).into(),
+                    Address::Char => Datum::Char(instr.1[1].1 as u8).into(),
+                    _ => e!("illegal argument to CONST instruction"),
+                }
             }),
 
             i::MKVEC  => self.expr = Datum::Vector(vec![]).into(),
@@ -629,7 +634,7 @@ mod tests {
         fn chk_err(&self, state: &VM) -> bool {
             if let Datum::String(ref msg) = *state.errr {
                 let msg = unsafe { str::from_utf8_unchecked(msg) };
-                if msg == self.errr.unwrap() {
+                if self.errr.is_some() && msg == self.errr.unwrap() {
                     true
                 } else {
                     print!("expected error {:?}, got {:?}\n", self.errr, msg);
@@ -1117,6 +1122,35 @@ mod tests {
         assert!(case.test_passes(&vm));
     }
 
+    #[test]
+    fn isa_consts() {
+        let mut vm = VM::from(Program(vec![
+            Instruction(i::CONST,  vec![Operand(Address::Expr,  0),
+                                        Operand(Address::Numer, 1)]),
+            Instruction(i::PUSH,   vec![Operand(Address::Expr,  0)]),
+            Instruction(i::CONST,  vec![Operand(Address::Expr,  0),
+                                        Operand(Address::Char, 'a' as u8 as usize)]),
+            Instruction(i::PUSH,   vec![Operand(Address::Expr,  0)]),
+            Instruction(i::CONST,  vec![Operand(Address::Expr,  0),
+                                        Operand(Address::Bool,  1)]),
+            Instruction(i::PUSH,   vec![Operand(Address::Expr,  0)]),
+        ]));
+
+        let case = TestResult{
+            expr: None,
+            stack: vec![
+                (0, Datum::Bool(true).into()),
+                (1, Datum::Char('a' as u8).into()),
+                (2, Datum::Number(Number::Fra(Fraction(1, 1))).into()),
+            ],
+            syms: vec![],
+            errr: None,
+        };
+
+        vm.run_program();
+        assert!(case.test_passes(&vm));
+    }
+
     /*
     #[test]
     fn isa_index() {