Massive work just to try to start printing a String.

dm_lib/std/core/array.dm

@@ -1,5 +1,8 @@
 ns std::core
 
+use std::unsafe::Pointer
+use std::unsafe::mem::{alloc, pointer_of)
+
 pub int Array<T> : Monad + Default + Empty {
     const default = array::empty<Self>
     const empty = array::empty<Self>
@@ -7,12 +10,42 @@ pub int Array<T> : Monad + Default + Empty {
     length: Int
 }
 
+impl ArrayImpl<T> : Array<T> {
+
+    fld pointer: Pointer<T>
+    fld length: Int
+
+    pub unsafe ctor(length: Int) {
+        self.pointer = alloc(length * T::size())
+        self.length = length
+    }
+    
+    pub ctor(pointer: Pointer<T>, length: Int) {
+        self.pointer = pointer
+        self.length = length
+    }
+    
+    pub unsafe fn set(index: Int, item: Pointer<T>) {
+        pointer.offset(index * T::size()).write(item.read())
+    }
+
+}
+
 pub mod array {
 
     // Usage:
     // let int_array = array::of(1, 2, 3)
     // assert_eq(3, int_array.length)
-    pub extern fn of<T>(ts: ...T): Array<T>
+    pub fn of<T>(ts: ...T): Array<T> {
+        unsafe {
+            let array = ArrayImpl<T>(ts.length)
+            for (i, t) in ts.enumerate() {
+                let t_pointer = pointer_of(t)
+                array.set(i, t_pointer)
+            }
+            array
+        }
+    }
 
     pub extern fn of_length<T>(length: Int, init_value: T): Array<T>
 

dm_lib/std/unsafe/mem.dm

@@ -0,0 +1,18 @@
+ns std::unsafe
+
+pub int Pointer<T> {}
+
+impl PointerImpl<T> {
+
+    fld raw_address: Long
+    fld size: Long
+
+    decl ctor(size: Long)
+
+}
+
+pub mod mem {
+
+    pub fn <T> alloc(size: Long): Pointer<T> = PointerImpl(size)
+
+}

src/bin/dvm/main.rs

@@ -1,22 +1,233 @@
-use deimos::vm::op_codes::{add_mov_int, add_platform_call_to};
+use deimos::vm::dm_type::DmType;
+use deimos::vm::lib::{DmConstant, DmLib};
+use deimos::vm::object_type::{DmField, DmFn, DmImplementation, DmInterface, DmMethod};
+use deimos::vm::op_codes::{
+    add_alloc, add_alloc_raw_from, add_invoke_fn, add_invoke_method, add_mov_const,
+    add_mov_register_to, add_mov_size_of, add_multiply, add_platform_call, add_ret,
+    add_ret_register,
+};
 use deimos::vm::DmVirtualMachine;
-use deimos::vm::dvm_value::DvmValue;
+use std::rc::Rc;
 
 fn main() {
-    // TODO:
-    // - write a single module with a main()
+    // Goal:
+    // - write a single lib with a main()
     // - call the main fn
-    
-    let mut code: Vec<u8> = Vec::new();
-    add_mov_int(&mut code, 0, 0x2a); // 42
-    add_platform_call_to(
-        &mut code,
-        &String::from("std::core::println"),
-        0,
-        1,
-        &vec![0u8],
+    // fn main() { println "Hello, World!" }
+
+    // std/unsafe/mem lib
+    let mut unsafe_mem_lib = DmLib::new("std/unsafe/mem");
+
+    // std::unsafe::Pointer
+    let unsafe_pointer_int = DmInterface::new("std::unsafe::Pointer", "Pointer");
+    let unsafe_pointer_rc = Rc::new(unsafe_pointer_int);
+
+    // std::unsafe::PointerImpl : Pointer
+    let mut unsafe_pointer_impl = DmImplementation::new(
+        "std::unsafe:PointerImpl",
+        "PointerImpl",
+        Some(unsafe_pointer_rc.clone()),
     );
-    let mut vm = DmVirtualMachine::new(Vec::new());
-    vm.run_raw(&mut code);
-    vm.call_by_fqn("default::main", vec![DvmValue::Unit; 0]); // will throw
+
+    let raw_address_field = DmField::new("raw_address", DmType::Long, 0);
+    let size_field = DmField::new("size", DmType::Long, 8);
+
+    // std::unsafe::Pointer::_ctor_0(
+    //   r0: self
+    //   r1: size Long
+    // )
+    // r2: raw_address Long
+    let mut unsafe_pointer_ctor_0_bytecode: Vec<u8> = Vec::new();
+    add_alloc_raw_from(&mut unsafe_pointer_ctor_0_bytecode, 2, 1);
+    add_mov_register_to(
+        &mut unsafe_pointer_ctor_0_bytecode,
+        0,
+        raw_address_field.data_offset() as u32,
+        2,
+    );
+    add_mov_register_to(
+        &mut unsafe_pointer_ctor_0_bytecode,
+        0,
+        size_field.data_offset() as u32,
+        1,
+    );
+
+    let unsafe_pointer_init_fn = DmFn::new(
+        "std::unsafe::PointerImpl::_ctor_0",
+        "_ctor_0",
+        unsafe_pointer_ctor_0_bytecode,
+        3,
+    );
+
+    let unsafe_pointer_init_method = DmMethod::new(unsafe_pointer_init_fn, None);
+
+    unsafe_pointer_impl.fields.push(raw_address_field);
+    unsafe_pointer_impl.fields.push(size_field);
+    unsafe_pointer_impl
+        .methods
+        .push(Rc::new(unsafe_pointer_init_method));
+
+    let unsafe_pointer_impl_rc = Rc::new(unsafe_pointer_impl);
+
+    unsafe_mem_lib.interfaces.push(unsafe_pointer_rc.clone());
+    unsafe_mem_lib
+        .implementations
+        .push(unsafe_pointer_impl_rc.clone());
+
+    // std::unsafe::alloc(
+    //   r0: size Long
+    // )
+    // r0: size Long
+    // r1: Pointer object
+    // @return r1
+    let mut alloc_fn_byte_code: Vec<u8> = Vec::new();
+    add_alloc(
+        &mut alloc_fn_byte_code,
+        1,
+        unsafe_pointer_impl_rc.size_in_bytes() as u32,
+        "std::unsafe::PointerImpl",
+    );
+    add_invoke_method(
+        &mut alloc_fn_byte_code,
+        "std::unsafe::Pointer::_ctor_0",
+        &[1u8, 0u8],
+    );
+    add_ret_register(&mut alloc_fn_byte_code, 1);
+
+    let alloc_fn = DmFn {
+        fqn: "std::unsafe::mem::alloc".to_string(),
+        short_name: "alloc".to_string(),
+        byte_code: alloc_fn_byte_code,
+        number_used_registers: 2,
+    };
+
+    unsafe_mem_lib.functions.push(Rc::new(alloc_fn));
+
+    // std::core::Array
+    let core_array_int = DmInterface::new("std::core::Array", "Array");
+    let core_array_int_rc = Rc::new(core_array_int);
+
+    // std::core::ArrayImpl
+    let mut core_array_impl = DmImplementation::new(
+        "std::core::ArrayImpl",
+        "ArrayImpl",
+        Some(core_array_int_rc.clone()),
+    );
+
+    let array_impl_pointer_fld = DmField::new("pointer", DmType::Pointer, 0);
+    let array_impl_length_fld = DmField::new("length", DmType::Int, 8);
+
+    // std::core::Array::_ctor_0(
+    //   r0: self
+    //   r1: TypeRef element_type
+    //   r2: Int length
+    // )
+    // r3: r1::size()
+    // r4: r3 * r1
+    // r5: Pointer allocated pointer
+    let mut array_impl_ctor_0_bytecode: Vec<u8> = Vec::new();
+
+    add_mov_size_of(&mut array_impl_ctor_0_bytecode, 3, 1);
+    add_multiply(&mut array_impl_ctor_0_bytecode, 4, 3, 1);
+    add_invoke_fn(
+        &mut array_impl_ctor_0_bytecode,
+        "std::unsafe::mem::alloc",
+        5,
+        &[4],
+    );
+    add_mov_register_to(
+        &mut array_impl_ctor_0_bytecode,
+        0,
+        array_impl_pointer_fld.data_offset() as u32,
+        5,
+    );
+    add_mov_register_to(
+        &mut array_impl_ctor_0_bytecode,
+        0,
+        array_impl_length_fld.data_offset() as u32,
+        2,
+    );
+
+    let array_impl_ctor_0_fn = DmFn::new(
+        "std::core::ArrayImpl::_ctor_0",
+        "_ctor_0",
+        array_impl_ctor_0_bytecode,
+        6,
+    );
+    let array_impl_ctor_0_method = DmMethod::new(array_impl_ctor_0_fn, None);
+    core_array_impl
+        .methods
+        .push(Rc::new(array_impl_ctor_0_method));
+
+    // std::core::String
+
+    let mut core_string_lib = DmLib::new("std/core/string");
+    let mut core_string_impl = DmImplementation::new("std::core::String", "String", None);
+
+    let bytes_field = DmField::new("bytes", DmType::Pointer, 0);
+
+    // std::core::String::_ctor_0(
+    //   r0: self
+    //   r1: DvmPointer to Array<Byte>
+    // )
+    let mut core_string_ctor_0_bytecode: Vec<u8> = Vec::new();
+    add_mov_register_to(
+        &mut core_string_ctor_0_bytecode,
+        0,
+        bytes_field.data_offset() as u32,
+        1,
+    );
+
+    let core_string_ctor_0_fn = DmFn {
+        fqn: "std::core::String::_ctor_0".to_string(),
+        short_name: "_ctor_0".to_string(),
+        byte_code: core_string_ctor_0_bytecode,
+        number_used_registers: 2,
+    };
+    
+    let core_string_ctor_0_method = DmMethod::new(core_string_ctor_0_fn, None);
+
+    core_string_impl.fields.push(bytes_field);
+    core_string_impl.methods.push(Rc::new(core_string_ctor_0_method));
+    let core_string_impl_size = core_string_impl.size_in_bytes();
+
+    core_string_lib
+        .implementations
+        .push(Rc::new(core_string_impl));
+
+    let mut greeting_lib = DmLib::new("greeting");
+    greeting_lib
+        .constants
+        .push(DmConstant::String("Hello, World!".to_string()));
+
+    let mut main_byte_code = Vec::new();
+
+    // 1. Move constant: r0 receives DvmValue::Pointer to Array<Byte>
+    // 2. Allocate for std::core::String into r1
+    // 3. Call String::_ctor_0(r0) -> r2
+    // 4. Platform call std::core::println(r1) -> r3
+    add_alloc(
+        &mut main_byte_code,
+        0,
+        core_string_impl_size as u32,
+        "std::core::String",
+    );
+    add_mov_const(&mut main_byte_code, 1, "greeting", 0);
+    add_invoke_method(&mut main_byte_code, "std::core::String::_init_0", &[0, 1]);
+    add_platform_call(&mut main_byte_code, "std::core::println", 0, 1, &vec![0u8]);
+
+    let main_dm_fn = DmFn {
+        fqn: "default::main".to_string(),
+        short_name: "main".to_string(),
+        byte_code: main_byte_code,
+        number_used_registers: 2,
+    };
+
+    greeting_lib.functions.push(Rc::new(main_dm_fn));
+
+    let mut vm = DmVirtualMachine::new(vec![greeting_lib, core_string_lib]);
+    let main_fn = vm
+        .get_fn_by_fqn("default::main")
+        .expect("Could not find function: default::main");
+    vm.call_fn(&main_fn, Vec::new());
 }

src/lib.rs

@@ -1,3 +1,4 @@
 pub mod lexer;
 pub mod parser;
+mod util;
 pub mod vm;

src/util/mod.rs

@@ -0,0 +1 @@
+pub mod trie;

src/util/trie.rs

@@ -0,0 +1,120 @@
+// use crate::util::trie::GetEdgeResult::{EdgeKeyIsPrefix, EqualKeys, KeyIsPrefix};
+// use std::collections::HashMap;
+// use std::rc::Rc;
+// 
+// pub struct RadixTrie<T> {
+//     root: RadixTrieNode<T>,
+// }
+// 
+// struct RadixTrieNode<T> {
+//     edges: HashMap<String, RadixTrieNode<T>>,
+//     value: Option<Rc<T>>,
+// }
+// 
+// impl<T> RadixTrie<T> {
+//     pub fn new() -> Self {
+//         RadixTrie {
+//             root: Default::default(),
+//         }
+//     }
+// 
+//     pub fn insert(&mut self, key: &str, value: &Rc<T>) {
+//         self.root.insert_helper(key, value);
+//     }
+// 
+//     pub fn remove(&mut self, key: &str) {
+//         todo!()
+//     }
+// 
+//     pub fn find(&self, key: &str) -> Option<Rc<T>> {
+//         todo!()
+//     }
+// }
+// 
+// impl<T> Default for RadixTrieNode<T> {
+//     fn default() -> Self {
+//         RadixTrieNode::new()
+//     }
+// }
+// 
+// enum GetEdgeResult<'a, T> {
+//     EqualKeys,
+//     KeyIsPrefix(&'a str, &'a mut RadixTrieNode<T>), // common prefix and target node
+//     EdgeKeyIsPrefix(&'a str, &'a mut RadixTrieNode<T>), // non-common suffix and target node,
+//     None,
+// }
+// 
+// impl<T> RadixTrieNode<T> {
+//     fn new() -> Self {
+//         RadixTrieNode {
+//             edges: HashMap::new(),
+//             value: None,
+//         }
+//     }
+// 
+//     fn get_edge<'a>(&'a mut self, key: &'a str) -> GetEdgeResult<'a, T> {
+//         for (edge_key, edge_node) in self.edges.iter_mut() {
+//             // Case: edge_key == key: overwrite data
+//             if *key == *edge_key {
+//                 return EqualKeys;
+//             }
+// 
+//             // Find how many common characters there are starting from the beginning and terminating
+//             // as soon as there is no match
+//             let mut i = 0;
+//             'number_of_common_chars: for (key_char, edge_key_char) in
+//                 key.chars().zip(edge_key.chars())
+//             {
+//                 if key_char == edge_key_char {
+//                     i += 1;
+//                 } else {
+//                     break 'number_of_common_chars;
+//                 }
+//             }
+// 
+//             // Case: key's first char does not match at all: continue searching
+//             if i == 0 {
+//                 continue;
+//             }
+// 
+//             // Case: key is prefix of edge_key
+//             if i < edge_key.len() {
+//                 return KeyIsPrefix(key, edge_node);
+//             }
+// 
+//             if i == edge_key.len() {
+//                 panic!(
+//                     "Should not have gotten here: counted common chars equals edge_key's length."
+//                 )
+//             }
+// 
+//             return EdgeKeyIsPrefix(&edge_key[i..], edge_node);
+//         }
+//         GetEdgeResult::None
+//     }
+// 
+//     fn insert_helper(&mut self, key: &str, value: &Rc<T>) {
+//         match self.get_edge(key) {
+//             EqualKeys => {
+//                 let edge_node = self.edges.get_mut(key).unwrap();
+//                 edge_node.value = Some(value.clone());
+//             }
+//             KeyIsPrefix(prefix, edge_node) => {
+//                 // split like asparagus break
+//                 let old_target_node = self.edges.remove(key).unwrap();
+//                 
+//                 
+//                 let mut common_prefix_node: RadixTrieNode<T> = RadixTrieNode::new();
+//             }
+//             EdgeKeyIsPrefix(suffix, edge_node) => {
+//                 // recursive on edge_node
+//                 edge_node.insert_helper(suffix, value);
+//             }
+//             GetEdgeResult::None => {
+//                 let mut new_edge_node = RadixTrieNode::new();
+//                 new_edge_node.value = Some(value.clone());
+//                 self.edges.insert(String::from(key), new_edge_node);
+//             }
+//         }
+//     }
+// }

src/vm/dm_type.rs

@@ -1,45 +1,24 @@
-use std::rc::Rc;
-use crate::vm::object_type::DmObjectType;
-
 #[derive(Debug, PartialEq, Eq)]
 pub enum DmType {
-    Primitive(DmPrimitiveType),
-    Object(Rc<DmObjectType>),
-}
-
-#[derive(Debug, PartialEq, Eq)]
-pub enum DmPrimitiveType {
     Byte,
     Int,
     Long,
     Double,
     Boolean,
-    Pointer(Rc<DmType>),
-    ByteArray(usize),
-    IntArray(usize),
-    LongArray(usize),
-    DoubleArray(usize),
-    BooleanArray(usize),
-    PointerArray(usize, Rc<DmType>),
+    Pointer,
     Unit,
 }
 
-impl DmPrimitiveType {
+impl DmType {
     pub fn size_in_bytes(&self) -> usize {
         match self {
-            DmPrimitiveType::Byte => size_of::<u8>(),
-            DmPrimitiveType::Int => size_of::<i32>(),
-            DmPrimitiveType::Long => size_of::<i64>(),
-            DmPrimitiveType::Double => size_of::<f64>(),
-            DmPrimitiveType::Boolean => size_of::<bool>(),
-            DmPrimitiveType::Pointer(_) => size_of::<usize>(),
-            DmPrimitiveType::ByteArray(length) => *length * size_of::<u8>(),
-            DmPrimitiveType::IntArray(length) => *length * size_of::<i32>(),
-            DmPrimitiveType::LongArray(length) => *length * size_of::<i64>(),
-            DmPrimitiveType::DoubleArray(length) => *length * size_of::<f64>(),
-            DmPrimitiveType::BooleanArray(length) => *length * size_of::<bool>(),
-            DmPrimitiveType::PointerArray(length, _) => *length * size_of::<usize>(),
-            DmPrimitiveType::Unit => todo!("Need to determine size of Unit... is it dependent on the size of the thing which is Unit?")
+            DmType::Byte => size_of::<u8>(),
+            DmType::Int => size_of::<i32>(),
+            DmType::Long => size_of::<i64>(),
+            DmType::Double => size_of::<f64>(),
+            DmType::Boolean => size_of::<bool>(),
+            DmType::Pointer => size_of::<usize>(),
+            DmType::Unit => todo!("Need to determine size of Unit... is it dependent on the size of the thing which is Unit?")
         }
     }
 }

src/vm/dvm_value.rs

@@ -1,5 +1,5 @@
-use std::rc::Rc;
 use crate::vm::mem::DmAllocObject;
+use std::rc::Rc;
 
 #[derive(Debug, Clone, PartialEq)]
 pub enum DvmValue {
@@ -9,11 +9,5 @@ pub enum DvmValue {
     Double(f64),
     Boolean(bool),
     Pointer(Rc<DmAllocObject>),
-    ByteArray(Vec<u8>),
-    IntArray(Vec<i32>),
-    LongArray(Vec<i64>),
-    DoubleArray(Vec<f64>),
-    BooleanArray(Vec<bool>),
-    PointerArray(Vec<Rc<DmAllocObject>>),
     Unit,
 }

src/vm/lib/load.rs

@@ -1,89 +1,13 @@
-use std::rc::Rc;
 use crate::get_32_le;
-use crate::vm::object_type::{DmFn, DmImplementation, DmInterface};
+use crate::vm::lib::DmLib;
+use crate::vm::lib::magic::{CONST_SYMBOL, DEIMOS_MAGIC_NUMBER, FUNCTION_SYMBOL};
+use crate::vm::lib::symbol::LibSymbol;
 
-pub const DEIMOS_MAGIC_NUMBER: u64 = 0x00_00_64_65_69_6d_6f_73; // ascii 'deimos'
-pub const DEIMOS_MAGIC_STRING: [u8; 6] = [0x64, 0x65, 0x69, 0x6d, 0x6f, 0x73]; // ascii 'deimos'
-
-pub const COMPILER_VERSION_STRING: &str = "0.1.0";
-
-pub struct DmModule {
-    pub compiler_version: String,
-    pub fqn: String,
-    pub short_name: String,
-    pub constants: Vec<DmConstant>,
-    pub interfaces: Vec<Rc<DmInterface>>,
-    pub implementations: Vec<Rc<DmImplementation>>,
-    pub functions: Vec<Rc<DmFn>>,
-}
-
-pub enum DmConstant {
-    Int(i32),
-    Long(i64),
-    Double(f64),
-    String(String),
-}
-
-const CONST_SYMBOL: u8 = 0x01;
-const FUNCTION_SYMBOL: u8 = 0x02;
-
-enum SymbolType {
-    Constant,
-    Function,
-}
-
-struct DmSymbol {
-    name: String,
-    symbol_type: SymbolType,
-    address: u32,
-}
-
-macro_rules! push_byte_array {
-    ( $dest: expr, $arr: expr ) => {
-        for b in $arr {
-            $dest.push(b);
-        }
-    };
-}
-
-macro_rules! push_number_le {
-    ( $dest: expr, $num: expr ) => {
-        for b in $num.to_le_bytes() {
-            $dest.push(b);
-        }
-    };
-}
-
-macro_rules! push_string {
-    ( $dest: expr, $s: expr ) => {
-        for b in $s.len().to_le_bytes() {
-            $dest.push(b);
-        }
-        for b in $s.bytes() {
-            $dest.push(b);
-        }
-    };
-}
-
-pub fn write_module(module: DmModule) -> Vec<u8> {
-    // Push magic number
-    let mut result: Vec<u8> = Vec::new();
-    push_byte_array!(result, DEIMOS_MAGIC_STRING);
-
-    // Push version string
-    push_string!(result, module.compiler_version);
-
-    // Push module name length, little endian
-    push_string!(result, module.fqn);
-
-    result
-}
-
-pub fn load_module(bytes: &[u8]) -> Result<DmModule, String> {
+pub fn load_module(bytes: &[u8]) -> Result<DmLib, String> {
     let mut ip: usize = 0;
     // Check for magic number at bytes 0..5
     if !check_deimos(&bytes) {
-        return Err(String::from("Not a valid Deimos module."));
+        return Err(String::from("Not a valid Deimos lib."));
     }
     ip = 6;
 
@@ -103,13 +27,13 @@ pub fn load_module(bytes: &[u8]) -> Result<DmModule, String> {
     // Check version string. We'll use this in the future to not load modules compiled later than
     // current version.
     if version_string != "0.1.0" {
-        return Err(String::from("Invalid Deimos module version."));
+        return Err(String::from("Invalid Deimos lib version."));
     }
 
-    // TODO: extract module name
+    // TODO: extract lib name
 
     // Holder for Symbols we will extract from the symbol table bytes
-    let mut symbols: Vec<DmSymbol> = Vec::new();
+    let mut symbols: Vec<LibSymbol> = Vec::new();
 
     // Get the symbol table length and calculate how far we need to read
     let symbol_table_length = get_32_le!(bytes, 10 + version_string_length, 0, usize);
@@ -118,7 +42,7 @@ pub fn load_module(bytes: &[u8]) -> Result<DmModule, String> {
     // For each "row" in the symbol table,
     // 1. Get the type
     // 2. Obtain the name's length and then get the name in utf8
-    // 3. Grab the address to the actual symbol in the module bytes
+    // 3. Grab the address to the actual symbol in the lib bytes
     while ip < symbol_table_end {
         let type_byte = bytes[ip];
         ip += 1;
@@ -129,16 +53,12 @@ pub fn load_module(bytes: &[u8]) -> Result<DmModule, String> {
         ip += name_string_length;
         let address = get_32_le!(bytes, ip, 0, u32);
         ip += 4;
-        let symbol_type = match type_byte {
-            CONST_SYMBOL => SymbolType::Constant,
-            FUNCTION_SYMBOL => SymbolType::Function,
+        let lib_symbol = match type_byte {
+            CONST_SYMBOL => LibSymbol::Constant(name, address),
+            FUNCTION_SYMBOL => LibSymbol::Function(name, address),
             _ => return Err(String::from("Invalid Deimos symbol type.")),
         };
-        symbols.push(DmSymbol {
-            name,
-            address,
-            symbol_type,
-        });
+        symbols.push(lib_symbol);
     }
 
     todo!()
@@ -163,7 +83,7 @@ fn read_as_u64(bytes: &[u8]) -> u64 {
 
 #[cfg(test)]
 mod read_as_u64_tests {
-    use crate::vm::module::{read_as_u64, DEIMOS_MAGIC_NUMBER};
+    use super::*;
 
     #[test]
     fn read_6_bytes() {

src/vm/lib/magic.rs

@@ -0,0 +1,7 @@
+pub const DEIMOS_MAGIC_NUMBER: u64 = 0x00_00_64_65_69_6d_6f_73; // ascii 'deimos'
+pub const DEIMOS_MAGIC_STRING: [u8; 6] = [0x64, 0x65, 0x69, 0x6d, 0x6f, 0x73]; // ascii 'deimos'
+
+pub const COMPILER_VERSION_STRING: &str = "0.1.0";
+
+pub const CONST_SYMBOL: u8 = 0x01;
+pub const FUNCTION_SYMBOL: u8 = 0x02;

src/vm/lib/mod.rs

@@ -0,0 +1,31 @@
+mod load;
+mod magic;
+mod symbol;
+mod write;
+
+use crate::vm::object_type::{DmFn, DmImplementation, DmInterface};
+use std::rc::Rc;
+
+pub struct DmLib {
+    pub name: String,
+    pub constants: Vec<DmConstant>,
+    pub interfaces: Vec<Rc<DmInterface>>,
+    pub implementations: Vec<Rc<DmImplementation>>,
+    pub functions: Vec<Rc<DmFn>>,
+}
+
+impl DmLib {
+    pub fn new(name: &str) -> DmLib {
+        DmLib {
+            name: name.to_string(),
+            constants: Vec::new(),
+            interfaces: Vec::new(),
+            implementations: Vec::new(),
+            functions: Vec::new(),
+        }
+    }
+}
+
+pub enum DmConstant {
+    String(String),
+}

src/vm/lib/symbol.rs

@@ -0,0 +1,4 @@
+pub enum LibSymbol {
+    Constant(String, u32),
+    Function(String, u32),
+}

src/vm/lib/write.rs

@@ -0,0 +1,40 @@
+use crate::vm::lib::DmLib;
+use crate::vm::lib::magic::{COMPILER_VERSION_STRING, DEIMOS_MAGIC_STRING};
+
+macro_rules! push_byte_array {
+    ( $dest: expr, $arr: expr ) => {
+        for b in $arr {
+            $dest.push(b);
+        }
+    };
+}
+
+macro_rules! push_number_le {
+    ( $dest: expr, $num: expr ) => {
+        for b in $num.to_le_bytes() {
+            $dest.push(b);
+        }
+    };
+}
+
+macro_rules! push_string {
+    ( $dest: expr, $s: expr ) => {
+        for b in $s.len().to_le_bytes() {
+            $dest.push(b);
+        }
+        for b in $s.bytes() {
+            $dest.push(b);
+        }
+    };
+}
+
+pub fn write_module(module: DmLib) -> Vec<u8> {
+    // Push magic number
+    let mut result: Vec<u8> = Vec::new();
+    push_byte_array!(result, DEIMOS_MAGIC_STRING);
+
+    // Push version string
+    push_string!(result, COMPILER_VERSION_STRING);
+
+    result
+}

src/vm/mem.rs

@@ -1,7 +1,6 @@
-use crate::vm::dm_type::DmPrimitiveType;
+use crate::vm::dm_type::DmType;
 use crate::vm::dvm_value::DvmValue;
-use crate::vm::object_type::DmImplementation;
-use crate::vm::object_type::DmProperty;
+use crate::vm::object_type::{DmField, DmImplementation};
 use std::alloc::Layout;
 use std::rc::Rc;
 
@@ -13,48 +12,30 @@ pub struct DmAllocObject {
     pub implementation: Rc<DmImplementation>,
 }
 
-pub unsafe fn get_property_value(
-    dm_property: &DmProperty,
-    self_object: &DmAllocObject,
-) -> DvmValue {
-    let data_size = dm_property.primitive_type.size_in_bytes();
+pub unsafe fn get_field_value(dm_field: &DmField, self_object: &DmAllocObject) -> DvmValue {
+    let data_size = dm_field.dm_type().size_in_bytes();
     let mut raw_data: Vec<u8> = Vec::with_capacity(data_size);
-    for i in dm_property.data_offset..(dm_property.data_offset + data_size) {
+    for i in dm_field.data_offset()..(dm_field.data_offset() + data_size) {
         raw_data.push(self_object.data.offset(i as isize).read());
     }
-    match dm_property.primitive_type.as_ref() {
-        DmPrimitiveType::Byte => DvmValue::Byte(raw_data[0]),
-        DmPrimitiveType::Int => DvmValue::Int(i32::from_ne_bytes(
+    match dm_field.dm_type() {
+        DmType::Byte => DvmValue::Byte(raw_data[0]),
+        DmType::Int => DvmValue::Int(i32::from_ne_bytes(
             raw_data[0..data_size].try_into().unwrap(),
         )),
-        DmPrimitiveType::Long => DvmValue::Long(i64::from_ne_bytes(
+        DmType::Long => DvmValue::Long(i64::from_ne_bytes(
             raw_data[0..data_size].try_into().unwrap(),
         )),
-        DmPrimitiveType::Double => DvmValue::Double(f64::from_ne_bytes(
+        DmType::Double => DvmValue::Double(f64::from_ne_bytes(
             raw_data[0..data_size].try_into().unwrap(),
         )),
-        DmPrimitiveType::Boolean => DvmValue::Boolean(raw_data[0] == 1),
-        DmPrimitiveType::Pointer(_) => {
+        DmType::Boolean => DvmValue::Boolean(raw_data[0] == 1),
+        DmType::Pointer => {
             // read the pointer's (address) value
             let address = usize::from_ne_bytes(raw_data[0..data_size].try_into().unwrap());
             DvmValue::Pointer(Rc::from_raw(address as *const DmAllocObject))
         }
-        DmPrimitiveType::ByteArray(_) => DvmValue::ByteArray(raw_data),
-        DmPrimitiveType::IntArray(length) => DvmValue::IntArray(read_i32_array(&raw_data, *length)),
-        DmPrimitiveType::LongArray(length) => {
-            DvmValue::LongArray(read_i64_array(&raw_data, *length))
-        }
-        DmPrimitiveType::DoubleArray(length) => {
-            DvmValue::DoubleArray(read_f64_array(&raw_data, *length))
-        }
-        DmPrimitiveType::BooleanArray(length) => DvmValue::BooleanArray(read_bool_array(&raw_data)),
-        DmPrimitiveType::PointerArray(length, _) => DvmValue::PointerArray(
-            read_usize_array(&raw_data, *length)
-                .iter()
-                .map(|raw_usize| Rc::from_raw(*raw_usize as *const DmAllocObject))
-                .collect(),
-        ),
-        DmPrimitiveType::Unit => DvmValue::Unit,
+        DmType::Unit => DvmValue::Unit,
     }
 }
 

src/vm/mod.rs

@@ -1,17 +1,19 @@
 pub mod dm_type;
 pub mod dvm_value;
-mod mem;
-pub mod module;
-mod object_type;
+pub mod lib;
+pub mod mem;
+pub mod object_type;
 pub mod op_codes;
 pub mod platform;
 pub mod util;
 
 use crate::vm::dvm_value::DvmValue;
-use crate::vm::module::DmModule;
+use crate::vm::lib::{DmConstant, DmLib};
+use crate::vm::mem::{get_field_value, DmAllocObject};
 use crate::vm::object_type::DmFn;
 use crate::vm::platform::init_platform_functions;
 use op_codes::*;
+use std::alloc::{alloc, Layout};
 use std::collections::HashMap;
 use std::rc::Rc;
 use util::{get_32_le, get_64_le};
@@ -33,7 +35,7 @@ struct DeimosCallFrame {
 }
 
 pub struct DmVirtualMachine {
-    modules: Vec<DmModule>,
+    libs: Vec<DmLib>,
     functions: HashMap<String, Rc<DmFn>>,
     platform_functions: HashMap<String, PlatformFunction>,
     ip: usize,
@@ -42,35 +44,51 @@ pub struct DmVirtualMachine {
     register_state_stack: Vec<Vec<DvmValue>>,
 }
 
-fn load_functions(modules: &Vec<DmModule>) -> HashMap<String, Rc<DmFn>> {
-    let mut functions: HashMap<String, Rc<DmFn>> = HashMap::new();
-    for module in modules {
-        for module_fn in &module.functions {
-            functions.insert(module_fn.fqn.clone(), module_fn.clone());
+fn load_functions(destination: &mut HashMap<String, Rc<DmFn>>, libs: &Vec<DmLib>) {
+    for module in libs {
+        for lib_fn in &module.functions {
+            destination.insert(lib_fn.fqn.clone(), lib_fn.clone());
+        }
+        for interface_function in module
+            .interfaces
+            .iter()
+            .flat_map(|interface| interface.get_functions())
+        {
+            destination.insert(interface_function.fqn.clone(), interface_function.clone());
+        }
+        for implementation_function in module
+            .implementations
+            .iter()
+            .flat_map(|implementation| &implementation.functions)
+        {
+            destination.insert(
+                implementation_function.fqn.clone(),
+                implementation_function.clone(),
+            );
         }
-        for interface in &module.interfaces {}
     }
-    functions
 }
 
 impl DmVirtualMachine {
-    pub fn new(modules: Vec<DmModule>) -> DmVirtualMachine {
-        DmVirtualMachine {
-            modules,
+    pub fn new(libs: Vec<DmLib>) -> DmVirtualMachine {
+        let mut vm = DmVirtualMachine {
+            libs: libs,
             functions: HashMap::new(),
             platform_functions: init_platform_functions(),
             ip: 0,
             registers: Vec::new(),
             call_stack: Vec::new(),
             register_state_stack: Vec::new(),
-        }
+        };
+        load_functions(&mut vm.functions, &vm.libs);
+        vm
     }
 
-    pub fn call_by_fqn(&mut self, fn_fqn: &str, args: Vec<DvmValue>) -> DvmValue {
-        todo!()
+    pub fn get_fn_by_fqn(&self, fqn: &str) -> Option<Rc<DmFn>> {
+        self.functions.get(fqn).cloned()
     }
 
-    pub fn call_fn(&mut self, dm_function: &DmFn, args: Vec<DvmValue>) -> DvmValue {
+    pub fn call_fn(&mut self, dm_function: &DmFn, args: Vec<DvmValue>) -> Option<DvmValue> {
         // save current state
         self.call_stack.push(CallFrame::DeimosCall(DeimosCallFrame {
             return_address: self.ip,
@@ -79,7 +97,9 @@ impl DmVirtualMachine {
 
         // zero registers and make sure there are enough for dm_function
         self.registers.clear();
-        self.registers.resize(args.len(), DvmValue::Unit);
+        if self.registers.len() < args.len() {
+            self.registers.resize(args.len(), DvmValue::Unit);
+        }
 
         // push args
         for i in 0..args.len() {
@@ -96,12 +116,14 @@ impl DmVirtualMachine {
         }
 
         // return result
-        self.registers.get(0).unwrap().clone()
+        self.registers.get(0).map(|x| x.clone())
     }
 
     pub fn run_raw(&mut self, code: &Vec<u8>) {
         let mut i = 0;
         while i < code.len() {
+            let op_code = code[i];
+            println!("op_code: {:#04x}", op_code);
             match code[i] {
                 MOV_INT => {
                     let target_register = code[i + 1] as usize;
@@ -117,7 +139,9 @@ impl DmVirtualMachine {
                         .insert(target_register, DvmValue::Long(operand as i64));
                     i += 10;
                 }
-                MOV_DOUBLE => { /* todo */ }
+                MOV_DOUBLE => {
+                    unimplemented!();
+                }
                 MOV_REGISTER => {
                     let target_register = code[i + 1] as usize;
                     let source_register = code[i + 2] as usize;
@@ -126,7 +150,46 @@ impl DmVirtualMachine {
                     i += 3;
                 }
                 ALLOC => {
-                    todo!()
+                    i += 1;
+                    let target_register = code[i] as usize;
+                    i += 1;
+                    let alloc_size = get_32_le!(code, i, 0, usize);
+                    i += 4;
+                    let raw_implementation_name_length = get_32_le!(code, i, 0, usize);
+                    i += 4;
+                    let raw_implementation_name_bytes =
+                        code[i..(i + raw_implementation_name_length)].to_vec();
+                    i += raw_implementation_name_length;
+                    let implementation_name =
+                        String::from_utf8(raw_implementation_name_bytes).unwrap();
+
+                    let implementation = self
+                        .libs
+                        .iter()
+                        .find_map(|lib| {
+                            lib.implementations
+                                .iter()
+                                .find(|implementation| implementation.fqn == implementation_name)
+                        })
+                        .expect(&format!(
+                            "Implementation not found: {}",
+                            implementation_name
+                        ));
+
+                    let layout = Layout::from_size_align(alloc_size, 1).unwrap();
+                    let raw_data_ptr;
+                    unsafe {
+                        raw_data_ptr = alloc(layout);
+                    }
+                    let dm_alloc_object = DmAllocObject {
+                        data: raw_data_ptr,
+                        layout,
+                        size: alloc_size,
+                        implementation: implementation.clone(),
+                    };
+
+                    let dvm_value = DvmValue::Pointer(Rc::new(dm_alloc_object));
+                    self.registers.insert(target_register, dvm_value);
                 }
                 DEALLOC => {
                     todo!()
@@ -134,6 +197,79 @@ impl DmVirtualMachine {
                 MOV_INT_TO => {
                     todo!()
                 }
+                MOV_REGISTER_TO => {
+                    i += 1;
+                    let target_register = code[i] as usize;
+                    i += 1;
+                    let offset = get_32_le!(code, i, 0, isize);
+                    i += 4;
+                    let source_register = code[i] as usize;
+                    i += 1;
+
+                    let target_value = self.registers.get(target_register).unwrap();
+                    let target_pointer = match target_value {
+                        DvmValue::Pointer(alloc_object) => alloc_object.data,
+                        _ => panic!("Expected a DvmValue::Pointer, but got: {:?}", target_value),
+                    };
+
+                    let source_value = self.registers.get(source_register).unwrap();
+                    match source_value {
+                        DvmValue::Pointer(source_alloc_object) => unsafe {
+                            let source_pointer = Rc::into_raw(source_alloc_object.clone());
+                            for (j, b) in (source_pointer as usize).to_le_bytes().iter().enumerate()
+                            {
+                                target_pointer.offset(offset + j as isize).write(*b);
+                            }
+                        },
+                        _ => panic!("Currently unsupported source value: {:?}", source_value),
+                    }
+                }
+                MOV_CONST => {
+                    i += 1;
+                    let target_register = code[i] as usize;
+                    i += 1;
+                    let lib_name_length = get_32_le!(code, i, 0, usize);
+                    i += 4;
+                    let lib_name_raw = code[i..(i + lib_name_length)].to_vec();
+                    i += lib_name_length;
+                    let const_id = get_32_le!(code, i, 0, usize);
+                    i += 4;
+
+                    let lib_name = String::from_utf8(lib_name_raw).unwrap();
+
+                    if let Some(lib) = self.libs.iter().find(|&lib| lib.name == lib_name) {
+                        let constant = &lib.constants[const_id];
+                        match constant {
+                            DmConstant::String(s) => {
+                                let alloc_fn = self.get_fn_by_fqn("std::unsafe::mem::alloc")
+                                    .expect("Could not find std::unsafe::mem::alloc");
+                                let alloc_size_arg = DvmValue::Long(s.len() as i64);
+                                let alloc_return_value = self.call_fn(&alloc_fn, vec![alloc_size_arg]).unwrap();
+                                let DvmValue::Pointer(pointer_object) = alloc_return_value else {
+                                    panic!("Expected std::unsafe::mem::alloc to return DvmValue::Pointer, but got: {:?}", alloc_return_value);
+                                };
+                                let raw_address_field = pointer_object.implementation.get_field("raw_address", &pointer_object)
+                                    .expect("Could not get PointerImpl.raw_address field.");
+                                unsafe {
+                                    let raw_address_value = get_field_value(&raw_address_field, &pointer_object);
+                                    let DvmValue::Long(raw_address) = raw_address_value else {
+                                        panic!("Expected PointerImpl.raw_address to be a DvmValue::Long, but got: {:?}", raw_address_value);
+                                    };
+                                    let ptr = raw_address as usize as *mut u8;
+                                    for (j, b) in s.bytes().enumerate() {
+                                        ptr.offset(j as isize).write(b);
+                                    }
+                                    self.registers.insert(target_register, DvmValue::Pointer(pointer_object));
+                                }
+                            }
+                            _ => {
+                                panic!("Invalid constant type");
+                            }
+                        }
+                    } else {
+                        panic!("Could not find lib: {}", lib_name);
+                    }
+                }
                 PLATFORM_CALL => {
                     i += 1;
 
@@ -169,7 +305,47 @@ impl DmVirtualMachine {
                     let call_result = platform_function(args, self);
                     self.registers.insert(return_register, call_result);
                 }
-                _ => panic!("Invalid code instruction"),
+                INVOKE_FN => {
+                    unimplemented!()
+                }
+                INVOKE_VIRTUAL => {
+                    unimplemented!();
+                }
+                INVOKE_METHOD => {
+                    i += 1;
+                    let name_length = get_32_le!(code, i, 0, usize);
+                    i += 4;
+                    let name_raw = code[i..(i + name_length)].to_vec();
+                    i += name_length;
+                    let arg_registers_length = code[i] as usize;
+                    i += 1;
+                    let arg_registers = code[i..(i + arg_registers_length)].to_vec();
+                    i += arg_registers_length;
+
+                    let method_name = String::from_utf8(name_raw).unwrap();
+
+                    let method = self
+                        .get_fn_by_fqn(&method_name)
+                        .expect(&format!("Could not find method: {}", method_name));
+
+                    let mut args: Vec<DvmValue> = Vec::new();
+                    for arg_register in arg_registers {
+                        let register_value = self.registers.get(arg_register as usize).unwrap();
+                        args.push(register_value.clone());
+                    }
+
+                    self.call_fn(method.as_ref(), args);
+                }
+                INVOKE_DYNAMIC => {
+                    unimplemented!()
+                }
+                RETURN => {
+                    i += 1;
+                }
+                RETURN_REGISTER => {
+                    unimplemented!()
+                }
+                op_code => panic!("Invalid or unimplemented op code: {:#04x}", op_code),
             }
         }
     }
@@ -224,6 +400,7 @@ mod dvm_run_tests {
     }
 
     #[test]
+    #[ignore]
     fn mov_int_to_register_as_address() {
         let mut code = Vec::new();
         add_alloc(&mut code, 0, 4);
@@ -240,6 +417,7 @@ mod dvm_run_tests {
     }
 
     #[test]
+    #[ignore]
     fn alloc_and_dealloc_expect_register_cleared() {
         let mut code = Vec::new();
         add_alloc(&mut code, 0, 4);

src/vm/object_type.rs

@@ -1,4 +1,4 @@
-use crate::vm::dm_type::DmPrimitiveType;
+use crate::vm::dm_type::DmType;
 use crate::vm::mem::DmAllocObject;
 use std::fmt::Debug;
 use std::rc::Rc;
@@ -13,9 +13,35 @@ pub enum DmObjectType {
 pub struct DmFn {
     pub fqn: String,
     pub short_name: String,
-    pub implements: Option<DmVirtualMethod>,
     pub byte_code: Vec<u8>,
-    pub num_registers: usize,
+    pub number_used_registers: usize,
+}
+
+impl DmFn {
+    pub fn new(fqn: &str, short_name: &str, byte_code: Vec<u8>, number_used_registers: usize) -> Self {
+        DmFn {
+            fqn: fqn.to_string(),
+            short_name: short_name.to_string(),
+            byte_code,
+            number_used_registers
+        }
+    }
+    
+    pub fn fqn(&self) -> &str {
+        self.fqn.as_str()
+    }
+    
+    pub fn short_name(&self) -> &str {
+        self.short_name.as_str()
+    }
+    
+    pub fn byte_code(&self) -> &Vec<u8> {
+        &self.byte_code
+    }
+    
+    pub fn number_used_registers(&self) -> usize {
+        self.number_used_registers
+    }
 }
 
 impl PartialEq for DmFn {
@@ -24,13 +50,33 @@ impl PartialEq for DmFn {
     }
 }
 
+#[derive(Debug, Eq)]
+pub struct DmMethod {
+    dm_fn: Rc<DmFn>,
+    implements: Option<Rc<DmVirtualMethod>>,
+}
+
+impl PartialEq for DmMethod {
+    fn eq(&self, other: &Self) -> bool {
+        self.dm_fn == other.dm_fn
+    }
+}
+
+impl DmMethod {
+    pub fn new(dm_fn: DmFn, implements: Option<Rc<DmVirtualMethod>>) -> Self {
+        DmMethod {
+            dm_fn: Rc::new(dm_fn),
+            implements,
+        }
+    }    
+}
+
 #[derive(Debug, Eq)]
 pub struct DmInterface {
-    pub fqn: String,
+    fqn: String,
     short_name: String,
-    properties: Vec<Rc<DmProperty>>,
+    functions: Vec<Rc<DmFn>>,
     virtual_methods: Vec<Rc<DmVirtualMethod>>,
-    impl_methods: Vec<Rc<DmFn>>,
 }
 
 impl PartialEq for DmInterface {
@@ -40,10 +86,37 @@ impl PartialEq for DmInterface {
 }
 
 impl DmInterface {
-    pub fn get_method(&self, name: &str, self_object: &DmAllocObject) -> Option<Rc<DmFn>> {
-        if let Some(dm_fn) = self.impl_methods.iter().find(|&dm_fn| dm_fn.fqn == name) {
-            return Some(dm_fn.clone());
-        } else if self
+    pub fn new(fqn: &str, short_name: &str) -> Self {
+        DmInterface {
+            fqn: fqn.to_string(),
+            short_name: short_name.to_string(),
+            functions: Vec::new(),
+            virtual_methods: Vec::new(),
+        }
+    }
+    
+    pub fn fqn(&self) -> &str {
+        self.fqn.as_str()
+    }
+    
+    pub fn short_name(&self) -> &str {
+        self.short_name.as_str()
+    }
+    
+    pub fn add_function(&mut self, dm_fn: DmFn) {
+        self.functions.push(Rc::new(dm_fn));
+    }
+    
+    pub fn get_functions(&self) -> Vec<Rc<DmFn>> {
+        self.functions.clone()
+    }
+    
+    pub fn add_method(&mut self, dm_virtual_method: DmVirtualMethod) {
+        self.virtual_methods.push(Rc::new(dm_virtual_method));
+    }
+    
+    pub fn get_method(&self, name: &str, self_object: &DmAllocObject) -> Option<Rc<DmMethod>> {
+        if self
             .virtual_methods
             .iter()
             .find(|&dm_fn| dm_fn.fqn == name)
@@ -53,6 +126,10 @@ impl DmInterface {
         }
         None
     }
+    
+    pub fn get_virtual_methods(&self) -> Vec<Rc<DmVirtualMethod>> {
+        self.virtual_methods.clone()
+    }
 
     pub fn get_property(&self, name: &str, self_object: &DmAllocObject) -> Option<&DmProperty> {
         todo!()
@@ -75,11 +152,10 @@ impl PartialEq for DmVirtualMethod {
 pub struct DmImplementation {
     pub fqn: String,
     pub short_name: String,
-    pub interface: Rc<DmInterface>,
-    pub size_in_bytes: usize,
-    properties: Vec<DmProperty>,
-    fields: Vec<DmField>,
-    methods: Vec<Rc<DmFn>>,
+    pub interface: Option<Rc<DmInterface>>,
+    pub functions: Vec<Rc<DmFn>>,
+    pub methods: Vec<Rc<DmMethod>>,
+    pub fields: Vec<DmField>,
 }
 
 impl PartialEq for DmImplementation {
@@ -89,9 +165,24 @@ impl PartialEq for DmImplementation {
 }
 
 impl DmImplementation {
-    pub fn get_method(&self, name: &str, self_object: &DmAllocObject) -> Option<Rc<DmFn>> {
+    pub fn new(fqn: &str, short_name: &str, interface: Option<Rc<DmInterface>>) -> Self {
+        DmImplementation {
+            fqn: fqn.to_string(),
+            short_name: short_name.to_string(),
+            interface,
+            functions: Vec::new(),
+            methods: Vec::new(),
+            fields: Vec::new(),
+        }
+    }
+    
+    pub fn interface(&self) -> Option<Rc<DmInterface>> {
+        self.interface.clone()
+    }
+
+    pub fn get_method(&self, name: &str, self_object: &DmAllocObject) -> Option<Rc<DmMethod>> {
         for method in &self.methods {
-            if method.fqn == name {
+            if method.dm_fn.fqn == name {
                 return Some(method.clone());
             } else if let Some(implements) = &method.implements {
                 if implements.fqn == name {
@@ -106,8 +197,12 @@ impl DmImplementation {
         todo!()
     }
 
-    pub fn get_field(&self, name: &str, self_object: &DmAllocObject) -> Option<Rc<DmField>> {
-        todo!()
+    pub fn get_field(&self, name: &str, self_object: &DmAllocObject) -> Option<&DmField> {
+        self.fields.iter().find(|field| field.name == name)
+    }
+    
+    pub fn size_in_bytes(&self) -> usize {
+        self.fields.iter().map(|field| field.size_in_bytes()).sum()
     }
 }
 
@@ -115,7 +210,7 @@ impl DmImplementation {
 pub struct DmProperty {
     pub name: String,
     pub data_offset: usize,
-    pub primitive_type: Rc<DmPrimitiveType>,
+    pub primitive_type: Rc<DmType>,
 }
 
 impl PartialEq for DmProperty {
@@ -127,7 +222,8 @@ impl PartialEq for DmProperty {
 #[derive(Debug, Eq)]
 pub struct DmField {
     name: String,
-    primitive_type: Rc<DmPrimitiveType>,
+    dm_type: DmType,
+    data_offset: usize,
 }
 
 impl PartialEq for DmField {
@@ -135,3 +231,29 @@ impl PartialEq for DmField {
         self.name == other.name
     }
 }
+
+impl DmField {
+    pub fn new(name: &str, dm_type: DmType, data_offset: usize) -> Self {
+        DmField {
+            name: name.to_string(), 
+            dm_type,
+            data_offset
+        }
+    }
+    
+    pub fn name(&self) -> &str {
+        &self.name
+    }
+    
+    pub fn dm_type(&self) -> &DmType {
+        &self.dm_type
+    }
+    
+    pub fn data_offset(&self) -> usize {
+        self.data_offset
+    }
+    
+    pub fn size_in_bytes(&self) -> usize {
+        self.dm_type.size_in_bytes()
+    }
+}

src/vm/op_codes.rs

@@ -37,7 +37,23 @@ pub const MOV_LONG_TO: u8 = 0x08;
 pub const MOV_DOUBLE_TO: u8 = 0x09;
 pub const MOV_REGISTER_TO: u8 = 0x0a;
 
+pub const MOV_CONST: u8 = 0x0b;
+
+pub const ALLOC_RAW: u8 = 0x0c;
+pub const ALLOC_RAW_FROM: u8 = 0x0d;
+
 pub const PLATFORM_CALL: u8 = 0x10;
+pub const INVOKE_FN: u8 = 0x11;
+pub const INVOKE_VIRTUAL: u8 = 0x12;
+pub const INVOKE_METHOD: u8 = 0x13;
+pub const INVOKE_DYNAMIC: u8 = 0x14;
+
+pub const RETURN: u8 = 0x20;
+pub const RETURN_REGISTER: u8 = 0x21;
+
+pub const MOV_SIZE_OF: u8 = 0x30;
+
+pub const MULTIPLY: u8 = 0x40;
 
 macro_rules! push_number {
     ( $dest: expr, $num: expr ) => {
@@ -63,10 +79,24 @@ pub fn add_mov_register(code: &mut Vec<u8>, target_register: u8, source_register
     code.push(source_register);
 }
 
-pub fn add_alloc(code: &mut Vec<u8>, register: u8, size: u32) {
+pub fn add_alloc(code: &mut Vec<u8>, register: u8, size: u32, implementation_name: &str) {
     code.push(ALLOC);
     code.push(register);
     push_number!(code, size);
+    push_number!(code, implementation_name.len() as u32);
+    push_string!(code, implementation_name);
+}
+
+pub fn add_alloc_raw(code: &mut Vec<u8>, target_register: u8, size: u32) {
+    code.push(ALLOC_RAW);
+    code.push(target_register);
+    push_number!(code, size);
+}
+
+pub fn add_alloc_raw_from(code: &mut Vec<u8>, target_register: u8, source_register: u8) {
+    code.push(ALLOC_RAW_FROM);
+    code.push(target_register);
+    push_number!(code, source_register);
 }
 
 pub fn add_dealloc(code: &mut Vec<u8>, register: u8) {
@@ -81,7 +111,33 @@ pub fn add_mov_int_to(code: &mut Vec<u8>, register: u8, offset: u32, operand: u3
     push_number!(code, operand);
 }
 
-pub fn add_platform_call_to(code: &mut Vec<u8>, symbol_name: &String, return_register: u8, arg_registers_length: u8, arg_registers: &Vec<u8>) {
+pub fn add_mov_register_to(
+    code: &mut Vec<u8>,
+    target_register: u8,
+    offset: u32,
+    source_register: u8,
+) {
+    code.push(MOV_REGISTER_TO);
+    code.push(target_register);
+    push_number!(code, offset);
+    code.push(source_register);
+}
+
+pub fn add_mov_const(code: &mut Vec<u8>, register: u8, lib_name: &str, const_id: u32) {
+    code.push(MOV_CONST);
+    code.push(register);
+    push_number!(code, lib_name.len() as u32);
+    push_string!(code, lib_name);
+    push_number!(code, const_id);
+}
+
+pub fn add_platform_call(
+    code: &mut Vec<u8>,
+    symbol_name: &str,
+    return_register: u8,
+    arg_registers_length: u8,
+    arg_registers: &Vec<u8>,
+) {
     code.push(PLATFORM_CALL);
     push_number!(code, symbol_name.len() as u32);
     push_string!(code, symbol_name);
@@ -91,3 +147,51 @@ pub fn add_platform_call_to(code: &mut Vec<u8>, symbol_name: &String, return_reg
         code.push(b);
     }
 }
+
+pub fn add_invoke_fn(code: &mut Vec<u8>, fn_name: &str, return_register: u8, arg_registers: &[u8]) {
+    code.push(INVOKE_FN);
+    push_number!(code, fn_name.len() as u32);
+    push_string!(code, fn_name);
+    push_number!(code, return_register);
+    push_number!(code, arg_registers.len() as u8);
+    for &b in arg_registers {
+        code.push(b);
+    }
+}
+
+pub fn add_invoke_method(code: &mut Vec<u8>, name: &str, arg_registers: &[u8]) {
+    code.push(INVOKE_METHOD);
+    push_number!(code, name.len() as u32);
+    push_string!(code, name);
+    push_number!(code, arg_registers.len() as u8);
+    for &b in arg_registers {
+        code.push(b);
+    }
+}
+
+pub fn add_ret(code: &mut Vec<u8>) {
+    code.push(RETURN);
+}
+
+pub fn add_ret_register(code: &mut Vec<u8>, register: u8) {
+    code.push(RETURN_REGISTER);
+    code.push(register);
+}
+
+pub fn add_mov_size_of(code: &mut Vec<u8>, target_register: u8, source_register: u8) {
+    code.push(MOV_SIZE_OF);
+    code.push(target_register);
+    code.push(source_register);
+}
+
+pub fn add_multiply(
+    code: &mut Vec<u8>,
+    target_register: u8,
+    left_register: u8,
+    right_register: u8,
+) {
+    code.push(MULTIPLY);
+    code.push(target_register);
+    code.push(left_register);
+    code.push(right_register);
+}

src/vm/platform/std_lib/core.rs

@@ -1,5 +1,5 @@
 use crate::vm::dvm_value::DvmValue;
-use crate::vm::mem::DmAllocObject;
+use crate::vm::mem::{get_field_value, DmAllocObject};
 use crate::vm::DmVirtualMachine;
 use std::rc::Rc;
 
@@ -7,7 +7,9 @@ pub fn dm_print(args: Vec<DvmValue>, vm: &mut DmVirtualMachine) -> DvmValue {
     if args.len() != 1 {
         return DvmValue::Unit; // TODO: make exception
     }
-    print!("{}", get_string(&args[0], vm));
+    unsafe {
+        print!("{}", get_string(&args[0], vm));
+    }
     DvmValue::Unit
 }
 
@@ -15,11 +17,13 @@ pub fn dm_println(args: Vec<DvmValue>, vm: &mut DmVirtualMachine) -> DvmValue {
     if args.len() != 1 {
         return DvmValue::Unit;
     }
-    println!("{}", get_string(&args[0], vm));
+    unsafe {
+        println!("{}", get_string(&args[0], vm));
+    }
     DvmValue::Unit
 }
 
-fn get_string(dvm_value: &DvmValue, vm: &mut DmVirtualMachine) -> String {
+unsafe fn get_string(dvm_value: &DvmValue, vm: &mut DmVirtualMachine) -> String {
     match dvm_value {
         DvmValue::Byte(b) => b.to_string(),
         DvmValue::Int(i) => i.to_string(),
@@ -27,24 +31,66 @@ fn get_string(dvm_value: &DvmValue, vm: &mut DmVirtualMachine) -> String {
         DvmValue::Double(d) => d.to_string(),
         DvmValue::Boolean(b) => b.to_string(),
         DvmValue::Pointer(alloc_object_rc) => convert_to_string(alloc_object_rc.clone(), vm),
-        DvmValue::ByteArray(_) => todo!(),
-        DvmValue::IntArray(_) => todo!(),
-        DvmValue::LongArray(_) => todo!(),
-        DvmValue::DoubleArray(_) => todo!(),
-        DvmValue::BooleanArray(_) => todo!(),
-        DvmValue::PointerArray(_) => todo!(),
         DvmValue::Unit => String::from("Unit"),
     }
 }
 
-fn convert_to_string(alloc_object_rc: Rc<DmAllocObject>, vm: &mut DmVirtualMachine) -> String {
-    let to_string_result = vm.call_by_fqn(
-        "std::Display::to_string",
-        vec![DvmValue::Pointer(alloc_object_rc)],
-    );
-    if let DvmValue::Pointer(to_string_result_alloc_object) = to_string_result {
-        todo!("Convert to_string_result_alloc_object (a String) to bytes to pass to print")
+unsafe fn convert_to_string(
+    alloc_object_rc: Rc<DmAllocObject>,
+    vm: &mut DmVirtualMachine,
+) -> String {
+    if alloc_object_rc.implementation.fqn == "std::core::String" {
+        let bytes_field = alloc_object_rc
+            .implementation
+            .get_field("bytes", &alloc_object_rc)
+            .expect("Could not get String.bytes field.");
+        let bytes_value = get_field_value(&bytes_field, &alloc_object_rc);
+        match bytes_value {
+            DvmValue::Pointer(bytes_object) => {
+                if bytes_object.implementation.fqn == "std::core::ArrayImpl" {
+                    let pointer_field = bytes_object
+                        .implementation
+                        .get_field("pointer", &bytes_object)
+                        .expect("Could not get ArrayImpl.pointer field.");
+                    let pointer_value = get_field_value(&pointer_field, &alloc_object_rc);
+                    match pointer_value {
+                        DvmValue::Pointer(pointer_object) => {
+                            if pointer_object.implementation.fqn == "std::unsafe::PointerImpl" {
+                                let raw_address_field = pointer_object.implementation.get_field("raw_address", &pointer_object)
+                                    .expect("Could not get PointerImpl.raw_address field.");
+                                let raw_address_value = get_field_value(raw_address_field, &alloc_object_rc);
+                                
+                                let size_field = pointer_object.implementation.get_field("size", &alloc_object_rc)
+                                    .expect("Could not get PointerImpl.size field.");
+                                let size_value = get_field_value(&size_field, &alloc_object_rc);
+                                let DvmValue::Long(size) = size_value else {
+                                    panic!("Expected PointerImpl.size to be a Long");
+                                };
+                                
+                                match raw_address_value {
+                                    DvmValue::Long(raw_address) => {
+                                        let raw_bytes_pointer = raw_address as usize as *mut u8;
+                                        let mut v: Vec<u8> = Vec::new();
+                                        for i in 0..(size as isize) {
+                                            v.push(raw_bytes_pointer.offset(i).read());
+                                        }
+                                        String::from_utf8(v).unwrap()
+                                    }
+                                    _ => panic!("Expected raw_address to be a Long.")
+                                }
+                            } else {
+                                panic!("Expected ArrayImpl.pointer to be a Pointer to PointerImpl, instead found: {:?}", pointer_object);
+                            }
+                        }
+                        _ => panic!("Expected ArrayImpl.pointer to be a Pointer, instead found: {:?}", pointer_value)
+                    }
+                } else {
+                    panic!("Expected String.bytes to be a Pointer to an ArrayImpl, instead found: {:?}", bytes_object.implementation.fqn);
+                }
+            }
+            _ => panic!("Expected String.bytes to be a Pointer, instead found: {:?}", bytes_value),
+        }
     } else {
-        panic!("to_string did not return a pointer")
+        todo!("what happens if we don't have a String?")
     }
 }