rishi/scryer-prolog
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add provisions for arithmetic support.

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This commit is contained in:
Mark Thom
2017-11-05 17:12:30 -07:00
parent a70c100e0d
commit 5568d0b370
15 changed files with 792 additions and 118 deletions
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14
src/prolog/and_stack.rs
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@@ -12,13 +12,13 @@ pub struct Frame {
}
impl Frame {
fn new(global_index: usize, e: usize, cp: CodePtr, n: usize) -> Self {
fn new(global_index: usize, sz: usize, e: usize, cp: CodePtr, n: usize) -> Self {
Frame {
global_index: global_index,
b0: 0,
e: e,
cp: cp,
perms: vec![Addr::HeapCell(0); n]
perms: (1 .. n+1).map(|i| Addr::StackCell(sz, i)).collect()
}
}
}
@@ -31,7 +31,8 @@ impl AndStack {
}
pub fn push(&mut self, global_index: usize, e: usize, cp: CodePtr, n: usize) {
self.0.push(Frame::new(global_index, e, cp, n));
let len = self.0.len();
self.0.push(Frame::new(global_index, len, e, cp, n));
}
#[allow(dead_code)]
@@ -46,13 +47,6 @@ impl AndStack {
pub fn clear(&mut self) {
self.0.clear()
}
// drop the last n frames.
#[allow(dead_code)]
pub fn drop_frames(&mut self, n: usize) {
let len = self.0.len();
self.0.truncate(len - n);
}
}
impl Index<usize> for AndStack {