add import statement

ltcc: map all outputted bytecode such that absolute addresses become relative to the file

typing: rename scope to super_scope

Cargo.toml

@@ -2,5 +2,6 @@
 members = [
   "lib-ltcore",
   "ltcc",
-  "ltvm"
+  "ltvm",
+  "ltobjdump",
 ]

lib-ltcore/Cargo.toml

@@ -7,4 +7,5 @@ edition = "2021"
 laddertypes = { path = "../../lib-laddertypes", features = ["pretty"] }
 tisc = { path = "../../lib-tisc" }
 serde = { version = "1.0", features = ["derive"] }
+iterate-text = "0.0.1"
 tiny-ansi = "0.1.0"

lib-ltcore/src/expr.rs

@@ -12,6 +12,9 @@ use {
 
 #[derive(Clone, Debug)]
 pub enum Statement {
+    Import {
+        path: String,
+    },
     Assignment {
         name_region: InputRegionTag,
         var_id: String,

lib-ltcore/src/parser.rs

@@ -225,6 +225,28 @@ where It: Iterator<Item = (InputRegionTag, Result<LTIRToken, LexError>)>
                             val_expr,
                         })
                     }
+                    "import" => {
+                        let region = region.clone();
+                        tokens.next();
+
+                        let tok = tokens.next();
+                        if let Some((path_region, path_token)) = tok {
+                            match path_token {
+                                Ok(LTIRToken::DoubleQuote(path_str)) => {
+                                    let _ = parse_expect(tokens, LTIRToken::StatementSep)?;
+
+                                    Ok(Statement::Import {
+                                        path: path_str
+                                    })
+                                }
+                                _ => {
+                                    Err((path_region, ParseError::UnexpectedToken))
+                                }
+                            }
+                        } else {
+                            Err((region, ParseError::UnexpectedEnd))
+                        }
+                    }
                     "return" => {
                         tokens.next();
                         let expr = parse_expr(super_scope, tokens)?;

lib-ltcore/src/procedure_compiler.rs

@@ -20,7 +20,12 @@ pub struct ProcedureCompiler {
     proc_symbol: String,
     scope: Arc<RwLock<Scope>>,
     asm: tisc::Assembler,
-    subroutines: Vec<tisc::assembler::AssemblyWord>,
+    subroutine_count: u32,
+    frame_size: u32,
+
+    in_types: Vec< laddertypes::TypeTerm >,
+    out_types: Vec< laddertypes::TypeTerm >,
+
     pub linker: tisc::Linker,
     pub diagnostics: Vec<( InputRegionTag, String )>
 }
@@ -30,48 +35,36 @@ impl ProcedureCompiler {
         ProcedureCompiler {
             proc_symbol,
             scope,
-            subroutines: Vec::new(),
+            subroutine_count: 0,
+            frame_size: 0,
+            in_types: vec![],
+            out_types: vec![],
             asm: tisc::Assembler::new(),
             linker: tisc::Linker::new(),
             diagnostics: Vec::new()
         }
     }
-/*
-    pub fn export_symbols(&self) -> Vec<(String, SymbolDef)> {
-        let mut scope = self.scope.write().unwrap();
-        scope.update_link_addresses(&self.proc_symbol, &self.linker);
-        scope.export()
+
+    pub fn make_subroutine_symbol(&mut self) -> String {
+        let id = self.subroutine_count;
+        self.subroutine_count += 1;
+        format!("__{}_sub_{}__", self.proc_symbol, id)
     }
-*/
-    pub fn get_bytecode(mut self, ret: bool) -> (
+
+    pub fn get_bytecode(mut self) -> (
         Vec<(String, SymbolDef)>,
         Vec<tisc::assembler::AssemblyWord>
     ) {
-        let frame_size = self.scope.read().unwrap().get_frame_size();
-        if frame_size > 0 {
+        if self.frame_size > 0 {
             let alloc_asm = tisc::Assembler::new()
-                .lit(frame_size as tisc::VM_Word).call("data-frame-alloc");
+                .lit(self.frame_size as tisc::VM_Word).call("data-frame-alloc");
             let drop_asm = tisc::Assembler::new()
-                .lit(frame_size as tisc::VM_Word).call("data-frame-drop");
+                .lit(self.frame_size as tisc::VM_Word).call("data-frame-drop");
 
             self.asm = alloc_asm.join( self.asm ).join( drop_asm );
         }
 
-        let main_section = self.asm.build();
-
-        //self.linker.add_procedure( &self.proc_symbol, main_section );
-        // ^--- this would insert the asm section at the end,
-        //     we however need it an the beginning of the bytecode
-
-        // insert section at front
-        self.linker.next_addr += main_section.len() as i64;
-        for (name,section) in self.linker.symbols.iter_mut() {
-            section.addr += main_section.len() as i64;
-        }
-        self.linker.symbols.insert(
-            self.proc_symbol.clone(),
-            tisc::linker::Section { addr: 0, data: main_section }
-        );
+        self.linker.add_procedure_front( &self.proc_symbol, self.asm.build() );
 
         // replace all symbol definitions from subroutines
         // with relative LinkAddr`s
@@ -80,22 +73,28 @@ impl ProcedureCompiler {
             &self.linker
         );
 
+        let code = 
+            self.linker.link_relative(&self.proc_symbol).expect("link error");
+
+        let mut export_symbols = self.scope.read().unwrap().export();
         (
-            self.scope.read().unwrap().export(),
-            self.linker.link_relative( &self.proc_symbol ).expect("link error")
+            export_symbols,
+            code
         )
     }
 
-    pub fn compile_statement(mut self, statement: &Statement, enable_export: bool) -> Self {
+    pub fn compile_statement(mut self, statement: &Statement) -> Self {
         match statement {
+            Statement::Import { path } => {
+            }
             Statement::Assignment { name_region, var_id, val_expr } => {
-                self = self.compile_expr(val_expr);
+                self = self.compile_expr(val_expr, true);
 
                 match self.scope.read().unwrap().get(var_id) {
                     Some(SymbolDef::FrameRef { typ, stack_ref }) => {
                         self.asm = self.asm.lit(stack_ref).call("data-frame-set");
                     }
-                    Some(SymbolDef::StaticRef { typ, link_addr }) => {
+                    Some(SymbolDef::StaticRef { typ, link_addr, export }) => {
                         self.asm = self
                             .asm
                             .static_ref(var_id.as_str())
@@ -127,35 +126,20 @@ impl ProcedureCompiler {
             } => {
                 let val_type = self.scope.read().unwrap()
                     .get(var_id).unwrap()
-                    .get_type(&mut self.scope.clone());
-                let val_type = val_type.sugar(&mut self.scope.clone());
+                    .get_type(&mut self.scope.clone())
+                    .sugar(&mut self.scope.clone());
+
                 match val_type {
                     laddertypes::SugaredTypeTerm::Func(mut f_types) => {
-                        let mut c = ProcedureCompiler::new(
-                            var_id.clone(),
-                            self.scope.clone()
-                        );
-                        c = c.compile_expr( val_expr );
+                        let mut c =
+                            ProcedureCompiler::new(
+                                var_id.clone(), self.scope.clone()
+                            ).compile_expr( val_expr, true );
+
                         self.diagnostics.append(&mut c.diagnostics);
 
-                        let (symbols,code) = c.get_bytecode( true );
-                        eprintln!("LET assign compiled {}", var_id);
-                        for (i,l) in tisc::assembler::disassemble( &code ).iter().enumerate() {
-                            eprintln!("{}+{} ... {}", var_id, i, l);
-                        }
+                        let (symbols,code) = c.get_bytecode();
                         self.linker.add_procedure(var_id, code);
-
-                        /*
-                        let out_types = vec![ f_types.pop().unwrap().desugar(&mut self.scope.clone()) ];
-                        let in_types = f_types.into_iter().map(|t| t.desugar(&mut self.scope.clone())).collect();
-
-                        self.scope.write().unwrap().declare_proc(
-                            var_id.clone(),
-                            in_types,
-                            out_types,
-                            true
-                        );
-                        */
                     }
 
                     _ => {
@@ -163,27 +147,34 @@ impl ProcedureCompiler {
                             name_region: *name_region,
                             var_id: var_id.clone(),
                             val_expr: val_expr.clone(),
-                        }, false);
+                        });
+
+                        self.frame_size += 1;
                     }
                 }
             }
             Statement::Expr(expr) => {
-                self = self.compile_expr(expr);
+                self = self.compile_expr(expr, true);
             }
             Statement::Return(expr) => {
-                self = self.compile_expr(expr);
+                self = self.compile_expr(expr, true);
             }
         }
         self
     }
 
-    pub fn compile_expr(mut self, expr: &LTExpr) -> Self {
+    pub fn compile_expr(mut self, expr: &LTExpr, call: bool) -> Self {
+        /*
+        self.out_types.push(
+            expr.infer_type( &self.scope ).expect("type error")
+        );
+        */
         match expr {
             LTExpr::Symbol { region, typ, symbol } => match self.scope.read().unwrap().get(symbol) {
                 Some(SymbolDef::FrameRef { typ, stack_ref }) => {
                     self.asm = self.asm.lit(stack_ref).call("data-frame-get");
                 }
-                Some(SymbolDef::StaticRef { typ, link_addr }) => {
+                Some(SymbolDef::StaticRef { typ, link_addr, export }) => {
                     self.asm = self.asm.static_ref(symbol.as_str());
                 }
                 Some(SymbolDef::Procedure {
@@ -192,7 +183,11 @@ impl ProcedureCompiler {
                     link_addr,
                     export
                 }) => {
-                    self.asm = self.asm.call_symbol(link_addr);
+                    if call {
+                        self.asm = self.asm.call_symbol(link_addr);
+                    } else {
+                        self.asm = self.asm.ref_symbol( link_addr );
+                    }
                 }
                 None => {
                     self.diagnostics.push(
@@ -210,10 +205,10 @@ impl ProcedureCompiler {
                 self.asm = self.asm.lit(*val);
             }
             LTExpr::Ascend { region, typ, expr } => {
-                self = self.compile_expr(expr);
+                self = self.compile_expr(expr, call);
             }
             LTExpr::Descend { region, typ, expr } => {
-                self = self.compile_expr(expr);
+                self = self.compile_expr(expr, call);
             }
             LTExpr::Branch {
                 region,
@@ -221,14 +216,14 @@ impl ProcedureCompiler {
                 if_expr,
                 else_expr,
             } => {
-                self = self.compile_expr(condition);
+                self = self.compile_expr(condition, true);
 
                 let asm = self.asm;
                 self.asm = tisc::Assembler::new();
-                self = self.compile_expr(if_expr);
+                self = self.compile_expr(if_expr, true);
                 let if_asm = self.asm;
                 self.asm = tisc::Assembler::new();
-                self = self.compile_expr(else_expr);
+                self = self.compile_expr(else_expr, true);
                 let else_asm = self.asm;
                 self.asm = asm;
                 self.asm = self.asm.branch(if_asm, else_asm);
@@ -237,34 +232,34 @@ impl ProcedureCompiler {
                 let asm = self.asm;
 
                 self.asm = tisc::Assembler::new();
-                self = self.compile_expr(condition);
+                self = self.compile_expr(condition, true);
                 let cond_asm = self.asm;
 
                 self.asm = tisc::Assembler::new();
-                self = self.compile_expr(body);
+                self = self.compile_expr(body, true);
                 let body_asm = self.asm;
 
                 self.asm = asm;
                 self.asm = self.asm.while_loop(cond_asm, body_asm);
             }
-            LTExpr::Application { region, typ, head, body } => {                
+            LTExpr::Application { region, typ, head, body } => {
                 for arg in body.iter().rev() {
-                    self = self.compile_expr(arg);
+                    self = self.compile_expr(arg, false);
                 }
-                self = self.compile_expr(head);
+                self = self.compile_expr(head, true);
             }
             LTExpr::Abstraction { region, scope, args, body } => {
-                let mut abs_compiler = ProcedureCompiler::new("__abs__".into(), scope.clone());
+                let abs_symbol = self.make_subroutine_symbol();
+                let mut abs_compiler = ProcedureCompiler::new(abs_symbol.clone(), scope.clone());
 
                 for (region, arg_name, arg_type) in args.iter() {
                     match scope.read().unwrap().get(arg_name) {
                         Some(SymbolDef::FrameRef{ typ, stack_ref }) => {
-                            eprintln!("Arg {} stack ref = {}", arg_name, stack_ref);
-
                             // TODO: aknowledge actual size of arguments
                             // let arg_size = typ.get_size()
                             let arg_size = 1;
 
+                            abs_compiler.frame_size += 1;
                             for i in 0..arg_size {
                                 abs_compiler.asm = abs_compiler.asm
                                     .lit(stack_ref + i)
@@ -280,50 +275,23 @@ impl ProcedureCompiler {
                     }
                 }
 
-                abs_compiler = abs_compiler.compile_expr( body );
-                let (abs_symbols, mut abs_code) = abs_compiler.get_bytecode( false );
-
-                for (s,def) in abs_symbols.iter() {
-                    eprintln!("{} = {:?}", s, def);
-                }
-                for (i, l) in tisc::assembler::disassemble(&abs_code).into_iter().enumerate() {
-                    eprintln!("__abs__+{} .. {}", i, l);
-                }
-
-                self.asm.words.append( &mut abs_code );
-/*
-                self.linker.add_procedure(
-                    "__abs__".into(),
-                    abs_code
-                );*/
+                abs_compiler = abs_compiler.compile_expr( body, true );
+                let (abs_export_symbols, mut abs_code) = abs_compiler.get_bytecode();
+                self.scope.write().unwrap().import( abs_export_symbols );
+                self.linker.add_procedure( &abs_symbol, abs_code );
+                self.asm = self.asm.call( &abs_symbol );
             }
-            LTExpr::Block { region, scope, statements } => {
-                let mut block_compiler = ProcedureCompiler::new(
-                    "__block__".into(),
-                    scope.clone()
-                );
-
+            LTExpr::ExportBlock{ region, scope, statements }
+            | LTExpr::Block { region, scope, statements } => {
+                let block_symbol = self.make_subroutine_symbol();
+                let mut block_compiler = ProcedureCompiler::new( block_symbol.clone(), scope.clone() );
                 for stmnt in statements.iter() {
-                    block_compiler = block_compiler.compile_statement( stmnt, true );
+                    block_compiler = block_compiler.compile_statement( stmnt );
                 }
-
-                let (block_symbols, mut block_code) = block_compiler.get_bytecode( true );
-
-                eprintln!("BLOCK compiler:");
-                for (s,def) in block_symbols.iter() {
-                    eprintln!("{} = {:?}", s, def);
-                }
-                for (i,l) in tisc::assembler::disassemble( &block_code ).into_iter().enumerate() {
-                    eprintln!("block+{} .. {}", i, l);
-                }
-
-                self.linker.
-                self.scope.write().unwrap().import(
-                      block_symbols
-                );
-                self.asm.words.append(&mut block_code);
-            }
-            LTExpr::ExportBlock{ region, scope, statements } => {
+                let (block_export_symbols, mut block_code) = block_compiler.get_bytecode();
+                self.scope.write().unwrap().import( block_export_symbols );
+                self.linker.add_procedure( &block_symbol, block_code.clone() );
+                self.asm = self.asm.call( &block_symbol );
             }
         }
         self

lib-ltcore/src/symbols.rs

@@ -20,6 +20,7 @@ pub enum SymbolDef {
     StaticRef {
         typ: laddertypes::TypeTerm,
         link_addr: Option<tisc::VM_Word>,
+        export: bool
     },
     Procedure {
         in_types: Vec<laddertypes::TypeTerm>,
@@ -36,7 +37,7 @@ impl SymbolDef {
     ) -> laddertypes::TypeTerm {
         match self {
             SymbolDef::FrameRef { typ, stack_ref: _ } => typ.clone(),
-            SymbolDef::StaticRef { typ, link_addr: _ } => typ.clone(),
+            SymbolDef::StaticRef { typ, link_addr: _, export: _ } => typ.clone(),
             SymbolDef::Procedure {
                 in_types,
                 out_types,
@@ -153,6 +154,7 @@ impl Scope {
             .iter()
             .filter(|(name, def)|
                 match def {
+                    SymbolDef::StaticRef { typ:_, link_addr:_, export } => *export,
                     SymbolDef::Procedure { in_types:_, out_types:_, link_addr:_, export } => *export,
                     _ => false
                 }
@@ -207,25 +209,38 @@ impl Scope {
         linker: &tisc::Linker
     ) {
         for (name, def) in self.symbols.iter_mut() {
-            if let Some(offset) = linker.get_link_addr( name ) {
-                match def {
-                    SymbolDef::Procedure {
-                        in_types:_,out_types:_,
-                        link_addr,
-                        export:_
-                    } => {
+            match def {
+                SymbolDef::Procedure {
+                    in_types:_,
+                    out_types:_,
+                    link_addr,
+                    export:_
+                } => {          
+                    if let Some(offset) = linker.get_link_addr( name ) {
+                        // eprintln!("update link addr {} @ {} + {}", name, base_symbol, offset);
                         *link_addr = LinkAddr::Relative{
                             symbol: base_symbol.clone(),
                             offset
                         };
-                    },
-                    _ => {}
+                    } else {
+                        match link_addr {
+                            LinkAddr::Relative{ symbol, offset } => {
+                                if let Some(base_symb_offset) = linker.get_link_addr( &symbol ) {
+                                    *symbol = base_symbol.clone();
+                                    *offset += base_symb_offset;
+                                }
+                            },
+                            _ => {}
+                        }
+                    }
+                }
+                _ => {
+                    // TODO: what about StaticRef??
                 }
             }
         }
     }
 
-    
     //<><><><><><>
 
     pub fn declare_proc_parse(
@@ -258,7 +273,7 @@ impl Scope {
                     }
                 })
                 .collect(),
-            false
+            true
         );
     }
 
@@ -305,15 +320,17 @@ impl Scope {
         let typ = self
             .parse(typ)
             .expect("parse typeterm");
-        self.declare_static(String::from(name), typ);
+        self.declare_static(String::from(name), typ, true);
     }
 
-    pub fn declare_static(&mut self, name: String, typ: laddertypes::TypeTerm) {
+    pub fn declare_static(&mut self, name: String, typ: laddertypes::TypeTerm, export: bool) {
+        eprintln!("add {} export {}", name, export);
         self.symbols.insert(
             name,
             SymbolDef::StaticRef {
                 typ,
                 link_addr: None,
+                export
             },
         );
     }

lib-ltcore/src/typing.rs

@@ -23,24 +23,39 @@ impl LTExpr {
         Err(TypeError::Todo)
     }*/
 
-    pub fn infer_type(&self, scope: &Arc<RwLock<Scope>>) -> TypeTag
+    pub fn export_symbols(&self) -> Vec< (String, SymbolDef) > {
+        match self {
+            LTExpr::Block{ region, scope, statements }
+            | LTExpr::ExportBlock{
+                region,
+                scope,
+                statements
+            } => {
+                scope.read().unwrap().export()
+            }
+
+            _ => vec![]
+        }
+    }
+
+    pub fn infer_type(&self, super_scope: &Arc<RwLock<Scope>>) -> TypeTag
     {
         match self {
             LTExpr::WordLiteral{ region, val } => {
-                Ok(scope.write().unwrap().parse(
-                    "ℤ_2^64 ~ machine.UInt64 ~ machine.Word"
+                Ok(super_scope.write().unwrap().parse(
+                    "machine.Int64 ~ machine.Word"
                 ).unwrap())
             }
 
             LTExpr::StringLiteral{ region, value } => {
-                Ok(scope.write().unwrap().parse(
+                Ok(super_scope.write().unwrap().parse(
                     "<Seq Char ~ Unicode ~ ℤ_2^32 ~ ℤ_2^64 ~ machine.UInt64>
                     ~ <TermArray 0 machine.UInt64 ~ machine.Word>"
                 ).unwrap())
             }
 
             LTExpr::Symbol { region, typ, symbol } => {
-                let mut s = scope.write().unwrap();
+                let mut s = super_scope.write().unwrap();
                 if let Some(sdef) = s.get(symbol) {
                     Ok(sdef.get_type(&mut *s))
                 } else {
@@ -50,7 +65,7 @@ impl LTExpr {
             }
 
             LTExpr::Ascend { region, typ, expr } => {
-                let expr_type = expr.infer_type( scope )?;
+                let expr_type = expr.infer_type( super_scope )?;
                 let sub_type = typ.clone();
 
                 /*
@@ -74,7 +89,7 @@ impl LTExpr {
             }
 
             LTExpr::Descend { region, typ, expr } => {
-                let expr_type = expr.infer_type(scope)?;
+                let expr_type = expr.infer_type(super_scope)?;
                 let super_type = typ.clone();
 
                 if let Ok(i) = expr_type.is_syntactic_subtype_of(&super_type) {
@@ -112,11 +127,11 @@ impl LTExpr {
             }
 
             LTExpr::Application{ region, typ, head, body } => {
-                let mut head_type = head.infer_type(scope)?;
+                let mut head_type = head.infer_type(super_scope)?;
                 let mut args = body.into_iter();
 
                 let mut result_type = head_type;
-                let mut sugared_result_type = result_type.sugar(&mut *scope.write().unwrap());
+                let mut sugared_result_type = result_type.sugar(&mut *super_scope.write().unwrap());
 
                 let mut errors = Vec::new();
 
@@ -126,10 +141,10 @@ impl LTExpr {
                     for (argi, expected_arg_type) in f_types.iter().enumerate() {
                         if let Some(arg) = args.next() {
 
-                            let expected_arg_type = expected_arg_type.clone().desugar(&mut *scope.write().unwrap());
+                            let expected_arg_type = expected_arg_type.clone().desugar(&mut *super_scope.write().unwrap());
 
                             // check subtype
-                            let received_arg_type = arg.infer_type(scope)?;
+                            let received_arg_type = arg.infer_type(super_scope)?;
                             if ! received_arg_type.is_syntactic_subtype_of(&expected_arg_type).is_ok() {
                                 errors.push(TypeError{
                                     region: arg.get_region(),
@@ -151,7 +166,7 @@ impl LTExpr {
                             
                             return
                                 if errors.len() == 0 {
-                                    result_type = sugared_result_type.desugar(&mut *scope.write().unwrap());
+                                    result_type = sugared_result_type.desugar(&mut *super_scope.write().unwrap());
                                     Ok(result_type)
                                 } else {
                                     Err(errors)
@@ -168,7 +183,7 @@ impl LTExpr {
                 }
 
                 if errors.len() == 0 {
-                    result_type = sugared_result_type.desugar(&mut *scope.write().unwrap());
+                    result_type = sugared_result_type.desugar(&mut *super_scope.write().unwrap());
                     Ok(result_type)
                 } else {
                     Err(errors)
@@ -176,13 +191,13 @@ impl LTExpr {
             }
 
             LTExpr::Branch { region, condition, if_expr, else_expr } => {
-                let received_cond_type = condition.infer_type(scope)?;
-                let expected_cond_type = scope.write().unwrap().parse("Bool ~ machine.Word").unwrap();
+                let received_cond_type = condition.infer_type(super_scope)?;
+                let expected_cond_type = super_scope.write().unwrap().parse("Bool ~ machine.Word").unwrap();
 
                 if received_cond_type.is_syntactic_subtype_of(&expected_cond_type).is_ok() {
 
-                    let if_expr_type = if_expr.infer_type(scope)?;
-                    let else_expr_type = else_expr.infer_type(scope)?;
+                    let if_expr_type = if_expr.infer_type(super_scope)?;
+                    let else_expr_type = else_expr.infer_type(super_scope)?;
 
                     if if_expr_type.is_syntactic_subtype_of(&else_expr_type).is_ok() {
                         Ok(else_expr_type)
@@ -208,14 +223,14 @@ impl LTExpr {
                 }
             }
             LTExpr::WhileLoop { region, condition, body } => {
-                let received_cond_type = condition.infer_type(scope)?;
-                let expected_cond_type = scope.write().unwrap().parse("Bool ~ machine.Word").unwrap();
+                let received_cond_type = condition.infer_type(super_scope)?;
+                let expected_cond_type = super_scope.write().unwrap().parse("Bool ~ machine.Word").unwrap();
 
                 if received_cond_type.is_syntactic_subtype_of(&expected_cond_type).is_ok() {
-                    let body_type = body.infer_type(scope)?;
-                    let body_type = body_type.sugar(&mut scope.clone());
+                    let body_type = body.infer_type(super_scope)?;
+                    let body_type = body_type.sugar(&mut super_scope.clone());
                     let loop_type = laddertypes::SugaredTypeTerm::Seq(vec![ body_type ]);
-                    Ok(loop_type.desugar(&mut scope.clone()))
+                    Ok(loop_type.desugar(&mut super_scope.clone()))
                 } else {
                     return Err(vec![ TypeError{
                         region: condition.get_region(),
@@ -230,8 +245,14 @@ impl LTExpr {
             LTExpr::Block{ region, scope, statements } => {
                 let mut types = Vec::new();
 
+                let enable_export =
+                    match self {
+                        LTExpr::ExportBlock{ region:_, scope:_, statements:_ } => true,
+                        _ => false
+                    };
+
                 for s in statements {
-                    match s.infer_type(scope) {
+                    match s.infer_type(scope, enable_export) {
                         Ok(Some(t)) => {
                             if !t.is_empty() {
                                 types.insert(0, t);
@@ -244,6 +265,11 @@ impl LTExpr {
                     }
                 }
 
+                let export = scope.read().unwrap().export();
+                super_scope.write().unwrap().import(
+                    export
+                );
+
                 Ok(
                     if types.len() == 1 { types.pop().unwrap() }
                     else { laddertypes::SugaredTypeTerm::Struct(types) }
@@ -255,8 +281,47 @@ impl LTExpr {
 }
 
 impl Statement {
-    pub fn infer_type(&self, scope: &Arc<RwLock<Scope>>) -> Result< Option<laddertypes::SugaredTypeTerm> , Vec<TypeError> > {
+    pub fn infer_type(&self, scope: &Arc<RwLock<Scope>>, enable_export: bool) -> Result< Option<laddertypes::SugaredTypeTerm> , Vec<TypeError> > {
         match self {
+            Statement::Import { path } => {
+                /*
+                 * 1. load file
+                 * 2. parse
+                 * 3. infer types
+                 * 3. import symbols
+                 */
+                let iter_chars = iterate_text::file::characters::IterateFileCharacters::new(path.clone());
+
+                /* compile source file
+                 */
+                let mut lexer = crate::lexer::LTIRLexer::from( iter_chars.peekable() );
+                let mut program_tokens =
+                    lexer
+                        .filter(|tok| match tok {
+                                (_, Ok(crate::lexer::LTIRToken::Comment(_))) => false,
+                                _ => true
+                        })
+                        .peekable();
+
+                let mut scope = scope.clone();
+                match crate::parser::parse_expr( &mut scope, &mut program_tokens ) {
+                    Ok( mut ast ) => {
+
+                        match ast.infer_type(&scope) {
+                            Ok(mut t) => {
+                            }
+
+                            Err(type_err) =>{
+                                eprintln!("In {} : Type Error", path);
+                            }
+                        }
+                    }
+                    Err( parse_err ) => {
+                        eprintln!("In {} : Parse Error", path);
+                    }
+                }
+                Ok(None)
+            }
             Statement::LetAssign{ name_region, typ, var_id, val_expr } => {
                 let typ = val_expr.infer_type( scope )?;
 
@@ -271,18 +336,17 @@ impl Statement {
                          let in_types = args.into_iter().map(|t| t.desugar(&mut scope.clone())).collect();
 
                          scope.write().unwrap()
-                             .declare_proc(
+                            .declare_proc(
                                  var_id.clone(),
                                  in_types,
                                  out_types,
-                                 true
+                                 enable_export
                             );
 
                         return Ok(None);
                     }
                     _ => {
                        let id = scope.write().unwrap().declare_var(var_id.clone(), typ);
-                       eprintln!("TYPING declare var = {}", id);
                        Ok(None)
                     }
                 }
@@ -291,6 +355,10 @@ impl Statement {
             Statement::Expr(expr) => {
                 let t = expr.infer_type(scope)?;
 
+                let symb = expr.export_symbols();
+//                eprintln!("expr statement: import symbols from expr {:?}", symb);
+//                scope.write().unwrap().import( symb );
+
                 if t != laddertypes::TypeTerm::App(vec![]) {
                     let st = t.sugar(&mut scope.clone());
                     Ok(Some(st))

ltcc/src/main.rs

@@ -17,6 +17,19 @@ use {
 
 mod diagnostic;
 
+
+
+
+/* TODO:
+ *   - import function symbols (use / import statement)
+ *   - parse float literals
+ *   - return type annotation
+ *   - write to address resulting from expression
+ *   - sized objects
+ *   - typecheck stack
+ */
+
+
 #[derive(Parser, Debug)]
 #[command(version, about, long_about = None)]
 struct Args {
@@ -32,7 +45,71 @@ fn main() {
     let args = Args::parse();
 
     let mut linker = tisc::Linker::new();
-    let root_scope = ltcore::runtime::init_runtime(&mut linker);
+    let mut runtime_linker = tisc::Linker::new();
+
+    let root_scope = ltcore::runtime::init_runtime(&mut runtime_linker);
+    let runtime_obj_file = tisc::linker::ObjectFile {
+        symbols: root_scope.read().unwrap().clone()
+            .export()
+            .into_iter()
+            .filter_map(|(symbol, def)| match def {
+                ltcore::symbols::SymbolDef::StaticRef { typ, link_addr, export } => {
+                    if export {
+                        if let Some(addr)= runtime_linker.get_link_addr(&symbol) {
+                            Some((symbol, addr))
+                        } else {
+                            None
+                        }
+                    } else {
+                        None
+                    }
+                }
+                ltcore::symbols::SymbolDef::Procedure { in_types:_, out_types:_, link_addr, export } => {
+                    if true {
+                        match link_addr {
+                            tisc::LinkAddr::Absolute(w) => {
+                                // eprintln!("add symbol {} -> {}", symbol, w);
+                                Some(( symbol, w ))
+                            }
+                            tisc::LinkAddr::Relative{ symbol: b, offset } => {
+                                let addr = runtime_linker.get_link_addr(&b).unwrap_or(-1);
+                                // eprintln!("relative symbol {} -> {}({})+{}", symbol, b, addr, offset);
+                                Some((symbol, addr + offset))
+                            }
+                        }
+                    } else {
+                        None
+                    }
+                }
+                _ => None
+            })
+            .collect(),
+
+        code: runtime_linker.link_partial().expect("Link error:")
+            .into_iter()
+            .map(|w| match w {
+                tisc::assembler::AssemblyWord::Symbol(
+                    tisc::LinkAddr::Absolute(a)
+                ) => {
+                    tisc::assembler::AssemblyWord::Symbol(
+                        tisc::LinkAddr::Relative{
+                            symbol: "runtime.lt.o".into(),
+                            offset: a
+                        }
+                    )
+                },
+
+                w => w
+            })
+            .collect()
+    };
+    let mut runtime_output = std::io::BufWriter::new(
+        std::fs::File::create("runtime.lt.o").expect("Failed to open file")
+    );
+    bincode::serialize_into( runtime_output, &runtime_obj_file );
+
+
+
     let mut main_scope = Scope::with_parent(&root_scope);
 
     for path in args.sources {
@@ -73,13 +150,13 @@ fn main() {
 
                         eprintln!("----------------------------------");
                         eprintln!("{} ({} errors)", "Typecheck failed".bright_red().bold(), type_errs.len());
-                        return;
+                        std::process::exit(-2);
                     }
                 }
 
-                compiler = compiler.compile_expr(&ast);
+                compiler = compiler.compile_expr(&ast, true);
                 let diagnostics = compiler.diagnostics.clone();
-                let (exports, proc_code) = compiler.get_bytecode(false);
+                let (exports, proc_code) = compiler.get_bytecode();
 
                 for (region, message) in diagnostics {
                     crate::diagnostic::print_diagnostic(
@@ -89,28 +166,16 @@ fn main() {
                     );
                 }
 
-
-                eprintln!("{} {}", "Compiled".green(), path.bold());
-                for (name, def) in exports.iter() {
-                    eprintln!("export {}:", name.yellow().bold());
-                    let mut t = def.get_type(&mut main_scope);
-                    t = t.normalize();
-                    t = t.param_normalize();
-                    let mut tc = main_scope.clone();
-                    eprintln!( "{}", t.sugar(&mut tc).pretty(&tc,0) );
-                }
-
-                main_scope.write().unwrap().import(
-                    exports
-                );
+                eprintln!("{} {}\n{}", "Compiled".green(), path.bold(), "---------------".green());
 
                 /* link assembly-program to symbols
                  */
-                eprintln!("generated bytecode ({})", proc_code.len() );
-                for (i,l) in tisc::assembler::disassemble(&proc_code).iter().enumerate() {
-                    eprintln!("{} .... {}", i,l);
-                }
-                linker.add_procedure(path.as_str(), proc_code);
+                linker.add_procedure_front(path.as_str(), proc_code);
+
+                main_scope.write().unwrap().update_link_addresses(
+                    &path,
+                    &linker
+                );
             }
             Err( (region, parse_error) ) => {
                 crate::diagnostic::print_diagnostic(
@@ -120,27 +185,43 @@ fn main() {
                 );
     
                 eprintln!("=======\nParse Error: Abort\n");
+                std::process::exit(-1);
             }
         }
     }
 
+    
     eprintln!("write output file {}", args.output);
     let obj_file = tisc::linker::ObjectFile {
         symbols: Arc::into_inner(main_scope).unwrap().into_inner().unwrap()
             .export()
             .into_iter()
             .filter_map(|(symbol, def)| match def {
+                ltcore::symbols::SymbolDef::StaticRef { typ, link_addr, export } => {
+                    if export {
+                        if let Some(addr) = linker.get_link_addr(&symbol) {
+                            Some((symbol.clone(), addr))
+                        } else {
+                            None
+                        }
+                    } else {
+                        None
+                    }
+                }
                 ltcore::symbols::SymbolDef::Procedure { in_types:_, out_types:_, link_addr, export } => {
                     if export {
                         match link_addr {
                             tisc::LinkAddr::Absolute(w) => {
-                                eprintln!("add symbol {} -> {}", symbol, w);
+                                // eprintln!("add symbol {} -> {}", symbol, w);
                                 Some(( symbol, w ))
                             }
                             tisc::LinkAddr::Relative{ symbol: b, offset } => {
-                                let addr = linker.get_link_addr(&b).unwrap_or(-1);
-                                eprintln!("relative symbol {} -> {}({})+{}", symbol, b, addr, offset);
-                                Some((symbol, addr + offset ))
+                                if let Some(addr) = linker.get_link_addr(&b) {
+                                     // eprintln!("relative symbol {} -> {}({})+{}", symbol, b, addr, offset);
+                                    Some((symbol, addr + offset ))
+                                } else {
+                                    None
+                                }
                             }
                         }
                     } else {
@@ -152,6 +233,22 @@ fn main() {
             .collect(),
 
         code: linker.link_partial().expect("Link error:")
+            .into_iter()
+            .map(|w| match w {
+                tisc::assembler::AssemblyWord::Symbol(
+                    tisc::LinkAddr::Absolute(a)
+                ) => {
+                    tisc::assembler::AssemblyWord::Symbol(
+                        tisc::LinkAddr::Relative{
+                            symbol: args.output.clone().into(),
+                            offset: a
+                        }
+                    )
+                },
+
+                w => w
+            })
+            .collect()
     };
 
     let mut output = std::io::BufWriter::new(

ltcc/src/oldmain.rs

@@ -1,30 +0,0 @@
-use {
-    std::collections::HashMap,
-    std::sync::{Arc, RwLock},
-    std::{boxed::Box, ops::Deref},
-    tiny_ansi::TinyAnsi
-};
-
-use crate::{
-    lexer::InputRegionTag,
-    expr::{LTExpr, Statement},
-    procedure_compiler::ProcedureCompiler,
-    symbols::Scope,
-};
-
-/* TODO:
- *   - import function symbols
- *   - Compiler error reporting
- *   - parse float literals
- *   - return type annotation
- *   - write to address resulting from expression
- *   - sized objects
- *   - Typecheck for LTExpr::Application
- *   - typecheck & inference for rest
- */
-
-fn main() {
-    // create virtual machine with 4096 words of memory
-    let mut vm = tisc::VM::new(0x1000);
-
-}

ltobjdump/Cargo.toml

@@ -0,0 +1,14 @@
+[package]
+name = "ltobjdump"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+laddertypes = { path = "../../lib-laddertypes" }
+ltcore = { path = "../lib-ltcore" }
+tisc = { path = "../../lib-tisc" }
+clap = { version = "4.5.15", features = ["derive"] }
+tiny-ansi = "0.1.0"
+iterate-text = "0.0.1"
+bincode = "1.3.3"
+

ltobjdump/src/main.rs

@@ -0,0 +1,50 @@
+use {
+    std::io::Read,
+    clap::Parser,
+    tiny_ansi::TinyAnsi,
+};
+
+#[derive(Parser, Debug)]
+#[command(version, about, long_about = None)]
+struct Args {
+    /// source files
+    sources: Vec< String >,
+}
+
+fn main() {
+    let args = Args::parse();
+
+    for source_path in args.sources.iter() {
+        let mut input = std::io::BufReader::new(
+            std::fs::File::open(source_path).expect("Failed to open file")
+        );
+
+        let obj_file : tisc::linker::ObjectFile
+            = bincode::deserialize_from( input ).expect("");
+
+        println!("{}\n{}", source_path.bold().yellow(), "------------".green());
+        println!("{}", "Symbols".bold().white());
+
+        for (name, addr) in obj_file.symbols.iter() {
+            println!("{} @ {}", name.bold().yellow(), format!("{:#010x}", addr).blue());
+        }
+
+        println!("{}\n{}", "------------".green(),
+            "Code".bold().white());
+
+        for (i,l) in tisc::assembler::disassemble( &obj_file.code )
+            .into_iter().enumerate()
+        {
+            for (name, addr) in obj_file.symbols.iter() {
+                if *addr == i as tisc::VM_Word {
+                    println!("{}:", name.bold().yellow());
+                }
+            }
+
+            println!("{} {}", format!("{:#06x}",i).blue(), l.green());
+        }
+
+        println!("{}\n", "============".green());
+    }
+}
+

ltvm/src/main.rs

@@ -25,20 +25,16 @@ fn main() {
     let mut vm = tisc::VM::new( args.memsize );
     let mut linker = tisc::Linker::new();
 
-    let mut symbols = std::collections::HashMap::<String, tisc::LinkAddr>::new();
-
     for source_path in args.sources.iter() {
         let mut input = std::io::BufReader::new(
             std::fs::File::open(source_path).expect("Failed to open file")
         );
 
-        linker.import( source_path, bincode::deserialize_from( input ).expect("") );
+        let obj_file : tisc::linker::ObjectFile = bincode::deserialize_from( input ).expect("");
+        linker.import( source_path, obj_file );
     }
 
     let entry_addr = linker.get_link_addr(&args.entry).unwrap_or(0);
-        /*
-        .expect(&format!("cant find entry symbol '{}'", args.entry));
-        */
     let bytecode = linker.link_total().expect("Link error:");
 
     eprintln!("{} ({} bytes)", "Loaded bytecode.".green(), bytecode.len());