fixed runtime stack missalignment

README.md

@@ -2,34 +2,62 @@
 
 Yard is an funny programming language compiler and interpreter written in pure Rust.  
 Its a functional language, having no concept of classes or inheritance. Types are static and must be known at compile time.
-It contains features such as:
 
-1.  a COMEFROM keyword (inverse goto)
+### Primitve data types 
-2.  a `don't` code block which never executes
+
-3.  no if. only `unless`, an inverted version of if. Meaning a block gets executed if the expression is false
+The language has 4 primitive data types:
-4.  three spaces start a single line comment
+
-5.  many ways of making comments: `// comment`, `:REM: comment`, `# comment`, `-- comment --` cuz we can
+*   `bool` a 1 byte boolean value which is either true or false. It can also be initalised with a random value at compile time iwht `maybe`
+*   `int` a 8 byte two's complement signed integer with 64-bit of storage space
+*   `rat` a 8 byte IEEE-754 double precision floating point value
+*   `str` a dynamically sized immutable string wich for now can only be used with the concatonation operator `..`
+
+NOTE: no custom data types such as structs or classes are supported.
 
 ### Keywords
 
-<table><tbody><tr><td>Syntax</td><td>Description</td><td>Example</td></tr><tr><td>Unless</td><td>Inverted if. Only executes the following block if the expression is false</td><td><pre><code class="language-plaintext">unless 3 &gt; 4 {
+<table><tbody><tr><td>Syntax</td><td>Description</td><td>Example</td></tr><tr><td>despite</td><td>Inverted if. Only executes the following block if the expression is false</td><td><pre><code class="language-plaintext">despite 3 &gt; 4 {
     // code block
-}</code></pre></td></tr><tr><td>Loop</td><td>While(true)-Loop. Loops forever until either yield, ret, break are used.<br>Loop take no boolean expression.</td><td><pre><code class="language-plaintext">loop {
+}</code></pre></td></tr><tr><td>loop</td><td>While(true)-Loop. Loops forever until either yield, ret, break are used.<br>Loop take no boolean expression.</td><td><pre><code class="language-plaintext">loop {
     // code block
-}</code></pre></td></tr><tr><td>cont</td><td>Short form for “continue”. Jumps to the next iteration of a loop</td><td>&nbsp;</td></tr><tr><td>break</td><td>Exits a loop immediately</td><td>&nbsp;</td></tr><tr><td>yield</td><td>Returns from a function with an argument as return value</td><td><pre><code class="language-plaintext">foo() = int {
+}</code></pre></td></tr><tr><td>cont</td><td>Short form for “continue”. Jumps to the next iteration of a loop</td><td><pre><code class="language-plaintext">loop {
+    cont;
+}</code></pre></td></tr><tr><td>break</td><td>Exits a loop immediately</td><td><pre><code class="language-plaintext">loop {
+    break;
+}</code></pre></td></tr><tr><td>yield</td><td>Returns from a function with an argument as return value</td><td><pre><code class="language-plaintext">foo() = int {
     yield 4
-}</code></pre></td></tr><tr><td>ret</td><td>Short form for “return”. This keyword takes no argument and returns from a function. NOTE: if ret is used in a function with a return type, an error occurs.</td><td>&nbsp;</td></tr><tr><td>please</td><td>Decides on runtime wether a block should be executed or not.</td><td><pre><code class="language-plaintext">please {
+}</code></pre></td></tr><tr><td>ret</td><td>Short form for “return”. This keyword takes no argument and returns from a function. NOTE: if ret is used in a function with a return type, an error occurs.</td><td><pre><code class="language-plaintext">foo() {
+    ret    // exit function
+}</code></pre></td></tr><tr><td>please</td><td>Decides on runtime wether a block should be executed or not.</td><td><pre><code class="language-plaintext">please {
     // code
-}</code></pre></td></tr></tbody></table>
+}</code></pre></td></tr><tr><td>unless</td><td>Works like a while loop except inverted. it will only run if the condition is false.</td><td><pre><code class="language-plaintext">unless x &gt; 5 {
+    // code
+}</code></pre></td></tr><tr><td>goto</td><td>jumps to a specified label</td><td><pre><code class="language-plaintext">'label
+// code
+goto label;</code></pre></td></tr></tbody></table>
 
 ### Example code
 
 ```plaintext
-foo(bar: int, abc:int) = int {
+-- compute the factorial
-    bar + abc
+-- in a recursive and functional way
+fac(x:int) = int {
+    despite x != 1 {
+        yield 1;
+    }
+
+    yield fac(x - 1) * x
 }
 
-main {
+number = rat 34	# this is a function without arguments and a braceless body
-    foo(4, 5)
+
+// main function
+main = int {
+
+    result = fac(number);
+
+    println("The Factorial of " .. number .. " is: " .. result);
+
+    yield 0;
 }
 ```

prog.vsasm

@@ -1,39 +1,46 @@
 section[text]
 
+0xa2b0391a480300b:
+	push float 12
+
+extern builtin 0x80b0eba54530cdc3
+
+extern builtin 0xcd262c6e6c32473d
+
 0xc8c7a99bb88e156b:
-	push int 0x0
+	call 0xa2b0391a480300b
+	call 0x80b0eba54530cdc3
+	call 0x967b65e0e8f1394
 	store 0x0
-	load 0x0
+	push string "The Factorial of "
-	push int 0x9
+	call 0xa2b0391a480300b
-	cmp gt int
+	push string " is: "
-	jump-unless 0x19
-	load 0x0
-	push int 0x5
-	cmp not-eq int
-	jump-unless 0xf
-	load 0x0
-	push int 0x1
-	add int
-	store 0x0
-	jump 0x2
-	push string ""
 	load 0x0
 	cat
-	call 0xa451e518c3d4dbea
+	cat
-	call 0x396ceaf58c7ab783
+	cat
-	load 0x0
+	call 0xe2e27e92bf406d33
+	push int 0x0
+	store 0x1
+	load 0x1
+	push int 0x9
+	cmp gt int
+	jump-unless 0x1b
+	push string ""
+	load 0x1
+	cat
+	call 0xe2e27e92bf406d33
+	load 0x1
 	push int 0x1
 	add int
-	store 0x0
+	store 0x1
-	jump 0x2
+	jump 0xe
-	jump 0x1b
-	jump 0x2
 	push int 0x0
 	ret
 
-extern builtin 0x396ceaf58c7ab783
+extern builtin 0xe2e27e92bf406d33
 
-extern builtin 0x608aa48c89877fc5
+extern builtin 0x8207427514e5a880
 
 0x967b65e0e8f1394:
 	load 0x0
@@ -50,8 +57,8 @@ extern builtin 0x608aa48c89877fc5
 	mul int
 	ret
 
-extern builtin 0xdcd0c37eed9c3ddf
+extern builtin 0x3e6a3810b5f0c581
 
-extern builtin 0x6d3c1164316ec324
+extern builtin 0x443bc4709cf7af32
 
-extern builtin 0xa451e518c3d4dbea
+extern builtin 0x23a9f04bf6903826

src/token/mod.rs

@@ -596,7 +596,7 @@ const TOKEN_REGEX_SRC: &'static str = concat!(
     r"|'([a-zA-Z0-9_]+)",    // labels: 'example
     r"|(goto\s+[a-zA-Z0-9_]+",   // goto example
     r"|despite|until|loop|break|cont|ret|yield|please)", // keywords
-    r"|\W(int|rat|bool|str)\W", // raw data types
+    r"|[\W\s]{0,1}(int|rat|bool|str)[\W\s]{0,1}", // raw data types
     r"|(true|false|ye|no|maybe)",   // boolean values
     r"|([A-Za-z_]+)\s*(?::\s*([a-zA-Z0-9_]+))?\s*=[^=]", // assignment var:int=
     r"|([A-Za-z_]+)\s*(?::\s*([a-zA-Z0-9_]+))",  // declaration  var:int

src/vmrt/mod.rs

@@ -368,9 +368,10 @@ fn parse_term<'a>(
                     if decl.name.as_ref().unwrap() == name {
                         code.push(Instr::Call(decl.uuid()));
 
+                        ct.stacksize -= decl.args.as_ref().unwrap_or(&Vec::new()).len();
+
                         if decl.results {
                             ct.stacksize += 1;
-                            ct.stacksize -= decl.args.as_ref().unwrap_or(&Vec::new()).len();
                         }
                     }
                 }

test.erpn

@@ -4,9 +4,13 @@ extern function print
 
 extern function println
 
-extern function print
+extern function to_rat
 
-extern function println
+extern function to_int
+
+extern function parse_int
+
+extern function parse_rat
 
 fac:
 	Load Arg x
@@ -23,24 +27,29 @@ fac:
 	Mul Int
 	Yield
 
+number:
+	Load Rat 12.0
+
 main:
+	Call number
+	Call to_int
+	Call fac
+	Store Int result
+	Load String "The Factorial of "
+	Call number
+	Load String " is: "
+	Load Var result
+	Cat Str
+	Cat Str
+	Cat Str
+	Call println
 	Load Int 0
 	Store Int x
-	Loop
 	Loopstart
 	Load Var x
 	Load Int 9
 	Gt Int
 	While
-			Load Var x
-			Load Int 5
-			NotEq Int
-			Unless
-				Load Var x
-				Load Int 1
-				Add Int
-				Store Int x
-				Continue
 		Load String ""
 		Load Var x
 		Cat Str
@@ -49,7 +58,6 @@ main:
 		Load Int 1
 		Add Int
 		Store Int x
-		Break
 	Load Int 0
 	Yield
 

test.yard

@@ -1,8 +1,9 @@
-@feature(io)
+@feature(io, conv)
 @version(100)
 @author(Sven Vogel)
 
-// recursion!
+-- compute the factorial
+-- in a recursive and functional way
 fac(x:int) = int {
     despite x != 1 {
         yield 1;
@@ -11,25 +12,20 @@ fac(x:int) = int {
     yield fac(x - 1) * x
 }
 
-main() = int {
+number = rat 12.0	# this is a function without arguments and a braceless body
 
-    x = 0
+// main function
-    loop {
+main = int {
 
+    result = fac(to_int(number));
+
+    println("The Factorial of " .. number() .. " is: " .. result);
+
+    x:int = 0;
     until x > 9 {
-            despite x != 5 {
+        println("" .. x);
-                x = x + 1
-                cont
-            }
-
-            println(""..x);
         x = x + 1
     }
 
-        break
+    yield 0;
-    }
-
-    println(""..fract(456.3928));
-
-    yield 0
 }