analyze externs and catch undefined function calls

src/analyzer.rs

@@ -6,7 +6,7 @@ use crate::{
 };
 
 pub struct Analyzer {
-    pub functions: HashMap<String, usize>,
+    pub functions: HashMap<String, i32>,
 }
 
 impl Analyzer {
@@ -28,7 +28,8 @@ impl Analyzer {
             if self.functions.contains_key(&name.lexeme) {
                 return error!(name.loc, format!("tried to redefine '{}'", name.lexeme));
             }
-            self.functions.insert(name.lexeme.clone(), params.len());
+            self.functions
+                .insert(name.lexeme.clone(), params.len() as i32);
         }
         Ok(())
     }
@@ -89,7 +90,12 @@ impl Analyzer {
             }
             Stmt::Break => {}
             Stmt::Continue => {}
-            Stmt::Extern(_) => {}
+            Stmt::Extern(name) => {
+                if self.functions.contains_key(&name.lexeme) {
+                    return error!(name.loc, format!("tried to redefine '{}'", name.lexeme));
+                }
+                self.functions.insert(name.lexeme.clone(), -1);
+            }
         }
         Ok(())
     }
@@ -120,14 +126,14 @@ impl Analyzer {
                 };
 
                 if let Some(arity) = self.functions.get(&callee) {
-                    if *arity != args.len() {
+                    if *arity >= 0 && *arity != args.len() as i32 {
                         return error!(
                             &paren.loc,
                             format!("expected {} arguments, got {}", arity, args.len())
                         );
                     }
-                } else {
-                    // TODO: cant error here since we dont analyze externs/builtins YET
+                } else if !callee.starts_with("_builtin_") {
+                    return error!(&paren.loc, format!("undefined function: {}", callee));
                 }
 
                 for arg in args {

src/codegen_x86_64.rs

@@ -100,18 +100,6 @@ impl CodegenX86_64 {
             "section .note.GNU-stack
     db 0
 
-section .text
-"
-        );
-
-        for name in &["malloc", "realloc", "free", "gethostbyname"] {
-            emit!(&mut self.output, "extern {}", name);
-            emit!(&mut self.output, "c.{} equ {}", name, name);
-        }
-
-        emit!(
-            &mut self.output,
-            "
 section .text._builtin_read8
 _builtin_read8:
     xor rax, rax

src/std.zr

@@ -1,13 +1,18 @@
+extern malloc
+extern realloc
+extern free
+extern gethostbyname
+
 func dbg.panic[msg: String] : Void
     io.print("PANIC: ")
     io.println(msg)
     os.exit(1)
 
 func mem.alloc[x: I64] : Ptr
-    return c.malloc(x)
+    return malloc(x)
 
 func mem.free[x: Ptr] : Void
-    c.free(x)
+    free(x)
 
 func mem.zero[x: I64, size: I64] : Void
     for i in 0..size
@@ -357,9 +362,11 @@ func array.new[] : Array
     return arr
 
 func array.nth[xs: Array, n: I64] : I64
-    // this probably should be implemented in the codegen
     if n < 0 | n >= array.size(xs)
         dbg.panic("array.nth out of bounds")
+    return array.nth_unchecked(xs, n)
+
+func array.nth_unchecked[xs: Array, n: I64] : I64
     let data: Ptr = mem.read64(xs)
     return mem.read64(data + n * 8)
 
@@ -376,7 +383,7 @@ func array.push[xs: Array, x: I64] : Void
         let new_capacity: I64 = 4
         if capacity != 0
             new_capacity = capacity * 2
-        let new_data: Ptr = c.realloc(data, new_capacity * 8)
+        let new_data: Ptr = realloc(data, new_capacity * 8)
         mem.write64(xs, new_data)
         mem.write64(xs + 8, new_capacity)
         data = new_data
@@ -514,7 +521,7 @@ func net.listen[port: I64] : I64
     return s
 
 func net.connect[host: String, port: I64] : I64
-    let he: Ptr = c.gethostbyname(host)
+    let he: Ptr = gethostbyname(host)
     if he == 0
         return -1