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refactor(tvix/eval): Factor out bind_values helper

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This is responsible for actually setting up `TrackedBinding`s on the
stack, i.e. in some sense "actually compiling" values in bindings.

There is no functionality change to before, i.e. this is a salami
slice.

Change-Id: Idb0312038e004470a7d130c020ae0fe87c55c218
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6774
Reviewed-by: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI
This commit is contained in:
Vincent Ambo 2022-09-23 19:38:34 +03:00 • committed by tazjin
parent 7e9169bcf7
commit f40283e098
1 changed files with 55 additions and 47 deletions
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102
tvix/eval/src/compiler/bindings.rs
View file

@ -434,6 +434,59 @@ impl Compiler<'_> {
self.scope_mut().end_scope();
}
/// Actually binds all tracked bindings by emitting the bytecode that places
/// them in their stack slots.
fn bind_values(&mut self, bindings: Vec<TrackedBinding>) {
let mut value_indices: Vec<LocalIdx> = vec![];
for binding in bindings.into_iter() {
value_indices.push(binding.value_slot);
if let Some(key_slot) = binding.key_slot {
let span = self.scope()[key_slot.slot].span;
self.emit_constant(Value::String(key_slot.name.into()), &span);
self.scope_mut().mark_initialised(key_slot.slot);
}
match binding.binding {
// This entry is an inherit (from) expr. The value is
// placed on the stack by selecting an attribute.
Binding::InheritFrom {
namespace,
name,
span,
} => {
// Create a thunk wrapping value (which may be one as well) to
// avoid forcing the from expr too early.
self.thunk(binding.value_slot, &namespace, move |c, n, s| {
c.compile(s, n.clone());
c.emit_force(n);
c.emit_constant(Value::String(name.into()), &span);
c.push_op(OpCode::OpAttrsSelect, &span);
})
}
// Binding is "just" a plain expression that needs to
// be compiled.
Binding::Plain { expr } => self.compile(binding.value_slot, expr),
}
// Any code after this point will observe the value in the
// right stack slot, so mark it as initialised.
self.scope_mut().mark_initialised(binding.value_slot);
}
// Final pass to emit finaliser instructions if necessary.
for idx in value_indices {
if self.scope()[idx].needs_finaliser {
let stack_idx = self.scope().stack_index(idx);
let span = self.scope()[idx].span;
self.push_op(OpCode::OpFinalise(stack_idx), &span);
}
}
}
fn compile_recursive_scope<N>(&mut self, slot: LocalIdx, kind: BindingsKind, node: &N) -> usize
where
N: ToSpan + ast::HasEntry,
@ -488,53 +541,8 @@ impl Compiler<'_> {
});
}
// Third pass to place the values in the correct stack slots.
let mut value_indices: Vec<LocalIdx> = vec![];
for binding in bindings.into_iter() {
value_indices.push(binding.value_slot);
if let Some(key_slot) = binding.key_slot {
let span = self.scope()[key_slot.slot].span;
self.emit_constant(Value::String(key_slot.name.into()), &span);
self.scope_mut().mark_initialised(key_slot.slot);
}
match binding.binding {
// This entry is an inherit (from) expr. The value is
// placed on the stack by selecting an attribute.
Binding::InheritFrom {
namespace,
name,
span,
} => {
// Create a thunk wrapping value (which may be one as well) to
// avoid forcing the from expr too early.
self.thunk(binding.value_slot, &namespace, move |c, n, s| {
c.compile(s, n.clone());
c.emit_force(n);
c.emit_constant(Value::String(name.into()), &span);
c.push_op(OpCode::OpAttrsSelect, &span);
})
}
// Binding is "just" a plain expression that needs to
// be compiled.
Binding::Plain { expr } => self.compile(binding.value_slot, expr),
}
// Any code after this point will observe the value in the
// right stack slot, so mark it as initialised.
self.scope_mut().mark_initialised(binding.value_slot);
}
// Fourth pass to emit finaliser instructions if necessary.
for idx in value_indices {
if self.scope()[idx].needs_finaliser {
let stack_idx = self.scope().stack_index(idx);
self.push_op(OpCode::OpFinalise(stack_idx), node);
}
}
// Actually bind values and ensure they are on the stack.
self.bind_values(bindings);
count
}