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REFACTOR: modules and functions carry around a reference to their code.

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This commit is contained in:
Jeremy Wall 2019-07-10 18:45:58 -05:00
parent fa294a2188
commit ed143b6a00
2 changed files with 65 additions and 58 deletions
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121
src/build/opcode/mod.rs
View File

@ -30,41 +30,43 @@ pub enum Primitive {
use Primitive::{Bool, Float, Int, Str}; use Primitive::{Bool, Float, Int, Str};
#[derive(Debug, PartialEq, Clone)] #[derive(Debug, PartialEq, Clone)]
pub enum Composite { pub enum Composite<'a> {
List(Vec<Value>), List(Vec<Value<'a>>),
Tuple(Vec<(String, Value)>), Tuple(Vec<(String, Value<'a>)>),
} }
use Composite::{List, Tuple}; use Composite::{List, Tuple};
#[derive(Debug, PartialEq, Clone)] #[derive(Debug, PartialEq, Clone)]
pub struct Func { pub struct Func<'a> {
ptr: usize, // TODO(jwall): Embed the OpsPointer?
ptr: OpPointer<'a>,
bindings: Vec<String>, bindings: Vec<String>,
snapshot: Stack, snapshot: Stack,
} }
#[derive(Debug, PartialEq, Clone)] #[derive(Debug, PartialEq, Clone)]
pub struct Module { pub struct Module<'a> {
ptr: usize, // TODO(jwall): Embed the OpsPointer?
ptr: OpPointer<'a>,
result_ptr: Option<usize>, result_ptr: Option<usize>,
flds: Vec<(String, Value)>, flds: Vec<(String, Value<'a>)>,
} }
#[derive(Debug, PartialEq, Clone)] #[derive(Debug, PartialEq, Clone)]
pub enum Value { pub enum Value<'a> {
// Binding names. // Binding names.
S(String), S(String),
// Primitive Types // Primitive Types
P(Primitive), P(Primitive),
// Composite Types. // Composite Types.
C(Composite), C(Composite<'a>),
// Program Pointer // Program Pointer
T(usize), T(usize),
// Function // Function
F(Func), F(Func<'a>),
// Module // Module
M(Module), M(Module<'a>),
} }
use Value::{C, F, M, P, S, T}; use Value::{C, F, M, P, S, T};
@ -113,7 +115,7 @@ pub enum Op {
Module(usize), Module(usize),
Func(usize), Func(usize),
Return, Return,
// - Call // Calls
FCall, FCall,
// Runtime hooks // Runtime hooks
// - Map, // - Map,
@ -129,21 +131,25 @@ pub enum Op {
pub struct Error {} pub struct Error {}
pub struct VM<'a> { pub struct VM<'a> {
stack: Vec<Value>, stack: Vec<Value<'a>>,
symbols: Stack, symbols: Stack,
ops: OpPointer<'a>, ops: OpPointer<'a>,
} }
impl<'a> VM<'a> { impl<'a> VM<'a> {
pub fn new(ops: &'a Vec<Op>) -> Self { pub fn new(ops: &'a Vec<Op>) -> Self {
Self::with_pointer(OpPointer::new(ops))
}
pub fn with_pointer(ops: OpPointer<'a>) -> Self {
Self { Self {
stack: Vec::new(), stack: Vec::new(),
symbols: Stack::new(), symbols: Stack::new(),
ops: OpPointer::new(ops), ops: ops,
} }
} }
pub fn to_scoped(&self, symbols: Stack) -> Self { pub fn to_scoped(self, symbols: Stack) -> Self {
Self { Self {
stack: Vec::new(), stack: Vec::new(),
symbols: symbols, symbols: symbols,
@ -151,7 +157,7 @@ impl<'a> VM<'a> {
} }
} }
pub fn run(&mut self) -> Result<(), Error> { pub fn run(&'a mut self) -> Result<(), Error> {
while self.ops.next().is_some() { while self.ops.next().is_some() {
let idx = self.ops.ptr.unwrap(); let idx = self.ops.ptr.unwrap();
match dbg!(self.ops.op()).unwrap() { match dbg!(self.ops.op()).unwrap() {
@ -197,12 +203,12 @@ impl<'a> VM<'a> {
Ok(()) Ok(())
} }
fn op_deref(&mut self, name: String) -> Result<(), Error> { fn op_deref(&'a mut self, name: String) -> Result<(), Error> {
let val = dbg!(self.get_binding(&name)?.clone()); let val = dbg!(self.get_binding(&name)?.clone());
self.push(val) self.push(val)
} }
fn op_jump(&mut self, jp: i32) -> Result<(), Error> { fn op_jump(&'a mut self, jp: i32) -> Result<(), Error> {
self.ops.jump( self.ops.jump(
self.ops self.ops
.ptr .ptr
@ -212,7 +218,7 @@ impl<'a> VM<'a> {
Ok(()) Ok(())
} }
fn op_jump_if_true(&mut self, jp: i32) -> Result<(), Error> { fn op_jump_if_true(&'a mut self, jp: i32) -> Result<(), Error> {
if let P(Bool(cond)) = self.pop()? { if let P(Bool(cond)) = self.pop()? {
if cond { if cond {
self.op_jump(jp)?; self.op_jump(jp)?;
@ -221,7 +227,7 @@ impl<'a> VM<'a> {
Ok(()) Ok(())
} }
fn op_jump_if_false(&mut self, jp: i32) -> Result<(), Error> { fn op_jump_if_false(&'a mut self, jp: i32) -> Result<(), Error> {
if let P(Bool(cond)) = self.pop()? { if let P(Bool(cond)) = self.pop()? {
if !cond { if !cond {
self.op_jump(jp)?; self.op_jump(jp)?;
@ -230,7 +236,7 @@ impl<'a> VM<'a> {
Ok(()) Ok(())
} }
fn op_select_jump(&mut self, jp: i32) -> Result<(), Error> { fn op_select_jump(&'a mut self, jp: i32) -> Result<(), Error> {
// pop field value off // pop field value off
let field_name = dbg!(self.pop())?; let field_name = dbg!(self.pop())?;
// pop search value off // pop search value off
@ -245,7 +251,7 @@ impl<'a> VM<'a> {
Ok(()) Ok(())
} }
fn op_module(&mut self, idx: usize, jptr: usize) -> Result<(), Error> { fn op_module(&'a mut self, idx: usize, jptr: usize) -> Result<(), Error> {
let (result_ptr, flds) = match self.pop()? { let (result_ptr, flds) = match self.pop()? {
C(Tuple(flds)) => (None, flds), C(Tuple(flds)) => (None, flds),
T(ptr) => { T(ptr) => {
@ -259,15 +265,17 @@ impl<'a> VM<'a> {
return dbg!(Err(Error {})); return dbg!(Err(Error {}));
} }
}; };
let mut ops = self.ops.clone();
ops.jump(idx)?;
self.push(M(Module { self.push(M(Module {
ptr: dbg!(idx), ptr: dbg!(ops),
result_ptr: result_ptr, result_ptr: result_ptr,
flds: dbg!(flds), flds: dbg!(flds),
}))?; }))?;
self.ops.jump(dbg!(jptr)) self.ops.jump(dbg!(jptr))
} }
fn op_func(&mut self, idx: usize, jptr: usize) -> Result<(), Error> { fn op_func(&'a mut self, idx: usize, jptr: usize) -> Result<(), Error> {
// get arity from stack // get arity from stack
let mut scope_snapshot = self.symbols.snapshot(); let mut scope_snapshot = self.symbols.snapshot();
scope_snapshot.push(); scope_snapshot.push();
@ -287,8 +295,10 @@ impl<'a> VM<'a> {
return dbg!(Err(Error {})); return dbg!(Err(Error {}));
} }
eprintln!("Pushing function definition on stack"); eprintln!("Pushing function definition on stack");
let mut ops = self.ops.clone();
ops.jump(idx)?;
self.push(dbg!(F(Func { self.push(dbg!(F(Func {
ptr: idx, // where the function starts. ptr: ops, // where the function starts.
bindings: bindings, bindings: bindings,
snapshot: scope_snapshot, snapshot: scope_snapshot,
})))?; })))?;
@ -296,7 +306,7 @@ impl<'a> VM<'a> {
self.ops.jump(jptr) self.ops.jump(jptr)
} }
fn op_fcall(&mut self) -> Result<(), Error> { fn op_fcall(&'a mut self) -> Result<(), Error> {
let f = self.pop()?; let f = self.pop()?;
if let F(Func { if let F(Func {
ptr, ptr,
@ -304,16 +314,14 @@ impl<'a> VM<'a> {
snapshot, snapshot,
}) = f }) = f
{ {
// TODO(jwall): This is wasteful. We can do better.
let mut vm = self.to_scoped(snapshot);
// use the captured scope snapshot for the function. // use the captured scope snapshot for the function.
let mut vm = Self::with_pointer(ptr).to_scoped(snapshot);
for nm in bindings { for nm in bindings {
// now put each argument on our scope stack as a binding. // now put each argument on our scope stack as a binding.
let val = self.pop()?; let val = self.pop()?;
vm.binding_push(nm, val)?; vm.binding_push(nm, val)?;
} }
// proceed to the function body // proceed to the function body
vm.ops.jump(ptr)?;
vm.run()?; vm.run()?;
self.push(vm.pop()?)?; self.push(vm.pop()?)?;
} else { } else {
@ -322,19 +330,19 @@ impl<'a> VM<'a> {
Ok(()) Ok(())
} }
fn op_thunk(&mut self, idx: usize, jp: i32) -> Result<(), Error> { fn op_thunk(&'a mut self, idx: usize, jp: i32) -> Result<(), Error> {
self.push(dbg!(T(idx)))?; self.push(dbg!(T(idx)))?;
self.op_jump(jp) self.op_jump(jp)
} }
fn op_equal(&mut self) -> Result<(), Error> { fn op_equal(&'a mut self) -> Result<(), Error> {
let left = self.pop()?; let left = self.pop()?;
let right = self.pop()?; let right = self.pop()?;
self.push(P(Bool(left == right)))?; self.push(P(Bool(left == right)))?;
Ok(()) Ok(())
} }
fn op_gt(&mut self) -> Result<(), Error> { fn op_gt(&'a mut self) -> Result<(), Error> {
let left = self.pop()?; let left = self.pop()?;
let right = self.pop()?; let right = self.pop()?;
match (left, right) { match (left, right) {
@ -349,7 +357,7 @@ impl<'a> VM<'a> {
Ok(()) Ok(())
} }
fn op_lt(&mut self) -> Result<(), Error> { fn op_lt(&'a mut self) -> Result<(), Error> {
let left = self.pop()?; let left = self.pop()?;
let right = self.pop()?; let right = self.pop()?;
match (left, right) { match (left, right) {
@ -364,7 +372,7 @@ impl<'a> VM<'a> {
Ok(()) Ok(())
} }
fn op_lteq(&mut self) -> Result<(), Error> { fn op_lteq(&'a mut self) -> Result<(), Error> {
let left = self.pop()?; let left = self.pop()?;
let right = self.pop()?; let right = self.pop()?;
match (left, right) { match (left, right) {
@ -379,7 +387,7 @@ impl<'a> VM<'a> {
Ok(()) Ok(())
} }
fn op_gteq(&mut self) -> Result<(), Error> { fn op_gteq(&'a mut self) -> Result<(), Error> {
let left = self.pop()?; let left = self.pop()?;
let right = self.pop()?; let right = self.pop()?;
match (left, right) { match (left, right) {
@ -394,7 +402,7 @@ impl<'a> VM<'a> {
Ok(()) Ok(())
} }
fn op_add(&mut self) -> Result<(), Error> { fn op_add(&'a mut self) -> Result<(), Error> {
// Adds the previous two items in the stack. // Adds the previous two items in the stack.
let left = self.pop()?; let left = self.pop()?;
let right = self.pop()?; let right = self.pop()?;
@ -403,7 +411,7 @@ impl<'a> VM<'a> {
Ok(()) Ok(())
} }
fn op_sub(&mut self) -> Result<(), Error> { fn op_sub(&'a mut self) -> Result<(), Error> {
// Subtracts the previous two items in the stack. // Subtracts the previous two items in the stack.
let left = self.pop()?; let left = self.pop()?;
let right = self.pop()?; let right = self.pop()?;
@ -412,7 +420,7 @@ impl<'a> VM<'a> {
Ok(()) Ok(())
} }
fn op_mul(&mut self) -> Result<(), Error> { fn op_mul(&'a mut self) -> Result<(), Error> {
// Multiplies the previous two items in the stack. // Multiplies the previous two items in the stack.
let left = self.pop()?; let left = self.pop()?;
let right = self.pop()?; let right = self.pop()?;
@ -421,7 +429,7 @@ impl<'a> VM<'a> {
Ok(()) Ok(())
} }
fn op_div(&mut self) -> Result<(), Error> { fn op_div(&'a mut self) -> Result<(), Error> {
// Divides the previous two items in the stack. // Divides the previous two items in the stack.
let left = self.pop()?; let left = self.pop()?;
let right = self.pop()?; let right = self.pop()?;
@ -430,7 +438,7 @@ impl<'a> VM<'a> {
Ok(()) Ok(())
} }
fn op_bind(&mut self) -> Result<(), Error> { fn op_bind(&'a mut self) -> Result<(), Error> {
// pop val off stack. // pop val off stack.
let val = dbg!(self.pop())?; let val = dbg!(self.pop())?;
// pop name off stack. // pop name off stack.
@ -443,7 +451,7 @@ impl<'a> VM<'a> {
Ok(()) Ok(())
} }
fn op_field(&mut self) -> Result<(), Error> { fn op_field(&'a mut self) -> Result<(), Error> {
// Add a Composite field value to a tuple on the stack // Add a Composite field value to a tuple on the stack
// get value from stack // get value from stack
let val = self.pop()?; let val = self.pop()?;
@ -466,7 +474,7 @@ impl<'a> VM<'a> {
Ok(()) Ok(())
} }
fn op_element(&mut self) -> Result<(), Error> { fn op_element(&'a mut self) -> Result<(), Error> {
// get element from stack. // get element from stack.
let val = self.pop()?; let val = self.pop()?;
// get next value. It should be a Composite list. // get next value. It should be a Composite list.
@ -482,7 +490,7 @@ impl<'a> VM<'a> {
Ok(()) Ok(())
} }
fn op_copy(&mut self) -> Result<(), Error> { fn op_copy(&'a mut self) -> Result<(), Error> {
// TODO Use Cow pointers for this? // TODO Use Cow pointers for this?
// get next value. It should be a Module. // get next value. It should be a Module.
let tgt = self.pop()?; let tgt = self.pop()?;
@ -512,10 +520,9 @@ impl<'a> VM<'a> {
} else { } else {
return dbg!(Err(Error {})); return dbg!(Err(Error {}));
} }
let mut vm = VM::new(self.ops.ops); let mut vm = Self::with_pointer(ptr);
vm.push(S("mod".to_owned()))?; vm.push(S("mod".to_owned()))?;
vm.push(C(Tuple(flds)))?; vm.push(C(Tuple(flds)))?;
vm.ops.jump(ptr)?;
vm.run()?; vm.run()?;
let mut flds = Vec::new(); let mut flds = Vec::new();
if let Some(ptr) = dbg!(result_ptr) { if let Some(ptr) = dbg!(result_ptr) {
@ -539,10 +546,10 @@ impl<'a> VM<'a> {
} }
fn merge_field_into_tuple( fn merge_field_into_tuple(
&self, &'a self,
src_fields: &mut Vec<(String, Value)>, src_fields: &'a mut Vec<(String, Value<'a>)>,
name: String, name: String,
value: Value, value: Value<'a>,
) -> Result<(), Error> { ) -> Result<(), Error> {
for fld in src_fields.iter_mut() { for fld in src_fields.iter_mut() {
if fld.0 == name { if fld.0 == name {
@ -554,12 +561,12 @@ impl<'a> VM<'a> {
Ok(()) Ok(())
} }
fn push(&mut self, p: Value) -> Result<(), Error> { fn push(&'a mut self, p: Value<'a>) -> Result<(), Error> {
self.stack.push(p); self.stack.push(p);
Ok(()) Ok(())
} }
fn binding_push(&mut self, name: String, val: Value) -> Result<(), Error> { fn binding_push(&'a mut self, name: String, val: Value) -> Result<(), Error> {
if self.symbols.is_bound(&name) { if self.symbols.is_bound(&name) {
return Err(Error {}); return Err(Error {});
} }
@ -567,21 +574,21 @@ impl<'a> VM<'a> {
Ok(()) Ok(())
} }
pub fn get_binding(&mut self, name: &str) -> Result<&Value, Error> { pub fn get_binding(&'a mut self, name: &str) -> Result<&'a Value, Error> {
match self.symbols.get(name) { match self.symbols.get(name) {
Some(v) => Ok(v), Some(v) => Ok(v),
None => Err(Error {}), None => Err(Error {}),
} }
} }
fn pop(&mut self) -> Result<Value, Error> { fn pop(&'a mut self) -> Result<Value, Error> {
match self.stack.pop() { match self.stack.pop() {
Some(v) => Ok(v), Some(v) => Ok(v),
None => Err(Error {}), None => Err(Error {}),
} }
} }
fn mul(&self, left: Value, right: Value) -> Result<Primitive, Error> { fn mul(&'a self, left: Value, right: Value) -> Result<Primitive, Error> {
Ok(match (left, right) { Ok(match (left, right) {
(P(Int(i)), P(Int(ii))) => Int(i * ii), (P(Int(i)), P(Int(ii))) => Int(i * ii),
(P(Float(f)), P(Float(ff))) => Float(f * ff), (P(Float(f)), P(Float(ff))) => Float(f * ff),
@ -589,7 +596,7 @@ impl<'a> VM<'a> {
}) })
} }
fn div(&self, left: Value, right: Value) -> Result<Primitive, Error> { fn div(&'a self, left: Value, right: Value) -> Result<Primitive, Error> {
Ok(match (left, right) { Ok(match (left, right) {
(P(Int(i)), P(Int(ii))) => Int(i / ii), (P(Int(i)), P(Int(ii))) => Int(i / ii),
(P(Float(f)), P(Float(ff))) => Float(f / ff), (P(Float(f)), P(Float(ff))) => Float(f / ff),
@ -597,7 +604,7 @@ impl<'a> VM<'a> {
}) })
} }
fn sub(&self, left: Value, right: Value) -> Result<Primitive, Error> { fn sub(&'a self, left: Value, right: Value) -> Result<Primitive, Error> {
Ok(match (left, right) { Ok(match (left, right) {
(P(Int(i)), Value::P(Int(ii))) => Int(i - ii), (P(Int(i)), Value::P(Int(ii))) => Int(i - ii),
(P(Float(f)), Value::P(Float(ff))) => Float(f - ff), (P(Float(f)), Value::P(Float(ff))) => Float(f - ff),
@ -605,7 +612,7 @@ impl<'a> VM<'a> {
}) })
} }
fn add(&self, left: Value, right: Value) -> Result<Primitive, Error> { fn add(&'a self, left: Value, right: Value) -> Result<Primitive, Error> {
Ok(match (left, right) { Ok(match (left, right) {
(P(Int(i)), Value::P(Int(ii))) => Int(i + ii), (P(Int(i)), Value::P(Int(ii))) => Int(i + ii),
(P(Float(f)), Value::P(Float(ff))) => Float(f + ff), (P(Float(f)), Value::P(Float(ff))) => Float(f + ff),

2
src/build/opcode/pointer.rs
View File

@ -14,7 +14,7 @@
use super::{Error, Op}; use super::{Error, Op};
#[derive(Clone)] #[derive(Debug, PartialEq, Clone)]
pub struct OpPointer<'a> { pub struct OpPointer<'a> {
pub ops: &'a Vec<Op>, pub ops: &'a Vec<Op>,
pub ptr: Option<usize>, pub ptr: Option<usize>,