feat(interface-types) Draft instruction interpreter.

lib/interface-types/src/ast.rs

@@ -1,3 +1,4 @@
+use crate::instructions::Instruction;
 use std::str;
 
 #[derive(PartialEq, Debug)]
@@ -21,30 +22,6 @@ pub(crate) enum AdapterKind {
     HelperFunction,
 }
 
-#[derive(PartialEq, Debug)]
-pub enum Instruction<'input> {
-    ArgumentGet(u64),
-    Call(u64),
-    CallExport(&'input str),
-    ReadUtf8,
-    WriteUtf8(&'input str),
-    AsWasm(InterfaceType),
-    AsInterface(InterfaceType),
-    TableRefAdd,
-    TableRefGet,
-    CallMethod(u64),
-    MakeRecord(InterfaceType),
-    GetField(InterfaceType, u64),
-    Const(InterfaceType, u64),
-    FoldSeq(u64),
-    Add(InterfaceType),
-    MemToSeq(InterfaceType, &'input str),
-    Load(InterfaceType, &'input str),
-    SeqNew(InterfaceType),
-    ListPush,
-    RepeatWhile(u64, u64),
-}
-
 #[derive(PartialEq, Debug)]
 pub struct Export<'input> {
     pub name: &'input str,

lib/interface-types/src/decoders/binary.rs

@@ -1,4 +1,4 @@
-use crate::ast::*;
+use crate::{ast::*, instructions::Instruction};
 use nom::{
     error::{make_error, ErrorKind, ParseError},
     Err, IResult,

lib/interface-types/src/encoders/wat.rs

@@ -1,5 +1,6 @@
-use crate::ast::{
-    Adapter, Export, Forward, ImportedFunction, Instruction, InterfaceType, Interfaces, Type,
+use crate::{
+    ast::{Adapter, Export, Forward, ImportedFunction, InterfaceType, Interfaces, Type},
+    instructions::Instruction,
 };
 
 impl From<&InterfaceType> for String {
@@ -267,7 +268,7 @@ impl<'input> From<&Interfaces<'input>> for String {
 
 #[cfg(test)]
 mod tests {
-    use crate::ast::*;
+    use crate::{ast::*, instructions::Instruction};
 
     #[test]
     fn test_interface_types() {

lib/interface-types/src/instructions/interpreter.rs

@@ -0,0 +1,83 @@
+use crate::instructions::{stack::Stack, Instruction};
+use std::convert::TryFrom;
+
+type ExecutableInstruction = dyn Fn(&mut Stack);
+//trait ExecutableInstruction: Fn(&mut Stack) {}
+
+pub(crate) struct Interpreter {
+    stack: Stack,
+    instructions: Vec<Box<dyn Fn(&mut Stack) + 'static>>,
+}
+
+impl Interpreter {
+    pub(crate) fn is_eos(&self) -> bool {
+        self.stack.is_empty()
+    }
+}
+
+impl<'binary_input> TryFrom<&Vec<Instruction<'binary_input>>> for Interpreter {
+    type Error = &'static str;
+
+    fn try_from(instructions: &Vec<Instruction>) -> Result<Self, Self::Error> {
+        let executable_instructions = instructions
+            .iter()
+            .map(|instruction| -> Box<dyn Fn(&mut Stack) + 'static> {
+                match instruction {
+                    Instruction::ArgumentGet(index) => {
+                        let index = index.to_owned();
+
+                        Box::new(move |stack: &mut Stack| {
+                            println!("argument get {}", index);
+                        })
+                    }
+                    Instruction::CallExport(export_name) => {
+                        let export_name = (*export_name).to_owned();
+
+                        Box::new(move |stack: &mut Stack| {
+                            println!("call export {}", export_name);
+                        })
+                    }
+                    Instruction::ReadUtf8 => Box::new(|stack: &mut Stack| {
+                        println!("read utf8");
+                    }),
+                    Instruction::Call(index) => {
+                        let index = index.to_owned();
+
+                        Box::new(move |stack: &mut Stack| {
+                            println!("call {}", index);
+                        })
+                    }
+                    _ => unimplemented!(),
+                }
+            })
+            .collect::<Vec<_>>();
+
+        Ok(Interpreter {
+            stack: Stack::new(),
+            instructions: executable_instructions,
+        })
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::Interpreter;
+    use crate::instructions::Instruction;
+    use std::convert::TryInto;
+
+    #[test]
+    fn test_interpreter_from_instructions() {
+        let instructions = vec![
+            Instruction::ArgumentGet(0),
+            Instruction::ArgumentGet(0),
+            Instruction::CallExport("strlen"),
+            Instruction::ReadUtf8,
+            Instruction::Call(7),
+        ];
+        let interpreter: Result<Interpreter, _> = (&instructions).try_into();
+        assert!(interpreter.is_ok());
+
+        let interpreter = interpreter.unwrap();
+        assert_eq!(interpreter.is_eos(), true);
+    }
+}

lib/interface-types/src/instructions/mod.rs

@@ -0,0 +1,28 @@
+use crate::ast::InterfaceType;
+
+pub mod interpreter;
+mod stack;
+
+#[derive(PartialEq, Debug)]
+pub enum Instruction<'input> {
+    ArgumentGet(u64),
+    Call(u64),
+    CallExport(&'input str),
+    ReadUtf8,
+    WriteUtf8(&'input str),
+    AsWasm(InterfaceType),
+    AsInterface(InterfaceType),
+    TableRefAdd,
+    TableRefGet,
+    CallMethod(u64),
+    MakeRecord(InterfaceType),
+    GetField(InterfaceType, u64),
+    Const(InterfaceType, u64),
+    FoldSeq(u64),
+    Add(InterfaceType),
+    MemToSeq(InterfaceType, &'input str),
+    Load(InterfaceType, &'input str),
+    SeqNew(InterfaceType),
+    ListPush,
+    RepeatWhile(u64, u64),
+}

lib/interface-types/src/instructions/stack.rs

@@ -0,0 +1,66 @@
+use std::{iter::Rev, vec::Drain};
+
+pub(super) struct Stack {
+    inner: Vec<u32>,
+}
+
+impl Stack {
+    pub(super) fn new() -> Self {
+        Self { inner: Vec::new() }
+    }
+
+    pub(super) fn is_empty(&self) -> bool {
+        self.inner.is_empty()
+    }
+
+    pub(super) fn push(&mut self, item: u32) {
+        self.inner.push(item);
+    }
+
+    pub(super) fn pop(&mut self) -> Option<u32> {
+        self.inner.pop()
+    }
+
+    pub(super) fn pop_n(&mut self, n: usize) -> Rev<Drain<u32>> {
+        self.inner.drain(self.inner.len() - n..).rev()
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::Stack;
+
+    #[test]
+    fn test_is_empty() {
+        let mut stack = Stack::new();
+        assert_eq!(stack.is_empty(), true);
+
+        stack.push(1);
+        assert_eq!(stack.is_empty(), false);
+    }
+
+    #[test]
+    fn test_push_pop() {
+        let mut stack = Stack::new();
+        stack.push(1);
+
+        assert_eq!(stack.pop(), Some(1));
+        assert_eq!(stack.is_empty(), true);
+    }
+
+    #[test]
+    fn test_pop_n() {
+        let mut stack = Stack::new();
+        stack.push(1);
+        stack.push(2);
+        stack.push(3);
+        stack.push(4);
+        stack.push(5);
+        stack.push(6);
+
+        assert_eq!(stack.pop_n(1).collect::<Vec<_>>(), &[6]);
+        assert_eq!(stack.pop_n(2).collect::<Vec<_>>(), &[5, 4]);
+        assert_eq!(stack.pop_n(3).collect::<Vec<_>>(), &[3, 2, 1]);
+        assert_eq!(stack.is_empty(), true);
+    }
+}

lib/interface-types/src/lib.rs

@@ -3,12 +3,13 @@ pub mod ast;
 mod macros;
 pub mod decoders;
 pub mod encoders;
+pub mod instructions;
 
 pub use decoders::binary::parse as parse_binary;
 
 #[cfg(test)]
 mod tests {
-    use crate::{ast::*, encoders::wat::*, parse_binary};
+    use crate::{ast::*, encoders::wat::*, instructions::Instruction, parse_binary};
     use std::fs;
     use wasmer_clif_backend::CraneliftCompiler;
     use wasmer_runtime_core as runtime;