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introduce CutPoint heap tag so that they can be offset by call_continuation/1

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This commit is contained in:
Mark
2023-06-29 12:14:06 -06:00
parent 83f352b95e
commit c36bd4dc07
7 changed files with 54 additions and 21 deletions
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2
src/arithmetic.rs
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@@ -685,7 +685,7 @@ impl TryFrom<HeapCellValue> for Number {
(HeapCellValueTag::F64, n) => {
Ok(Number::Float(*n))
}
(HeapCellValueTag::Fixnum, n) => {
(HeapCellValueTag::Fixnum | HeapCellValueTag::CutPoint, n) => {
Ok(Number::Fixnum(n))
}
_ => {

6
src/machine/dispatch.rs
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@@ -1149,17 +1149,17 @@ impl Machine {
&Instruction::GetLevel(r) => {
let b0 = self.machine_st.b0;
self.machine_st[r] = fixnum_as_cell!(Fixnum::build_with(b0 as i64));
self.machine_st[r] = fixnum_as_cell!(Fixnum::as_cutpoint(b0 as i64));
self.machine_st.p += 1;
}
&Instruction::GetPrevLevel(r) => {
let prev_b = self.machine_st.stack.index_or_frame(self.machine_st.b).prelude.b;
self.machine_st[r] = fixnum_as_cell!(Fixnum::build_with(prev_b as i64));
self.machine_st[r] = fixnum_as_cell!(Fixnum::as_cutpoint(prev_b as i64));
self.machine_st.p += 1;
}
&Instruction::GetCutPoint(r) => {
self.machine_st[r] = fixnum_as_cell!(Fixnum::build_with(self.machine_st.b as i64));
self.machine_st[r] = fixnum_as_cell!(Fixnum::as_cutpoint(self.machine_st.b as i64));
self.machine_st.p += 1;
}
&Instruction::Cut(r) => {

2
src/machine/machine_state.rs
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@@ -821,7 +821,7 @@ impl MachineState {
let b = self.b;
read_heap_cell!(value,
(HeapCellValueTag::Fixnum, b0) => {
(HeapCellValueTag::CutPoint, b0) => {
let b0 = b0.get_num() as usize;
if b > b0 {

14
src/machine/system_calls.rs
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@@ -981,7 +981,7 @@ impl MachineState {
self.p = cp + 1;
// adjust cut point to occur after call_continuation.
/*
if num_cells > 0 {
if let HeapCellValueTag::Fixnum = self.heap[s + 2].get_tag() {
and_frame[1] = fixnum_as_cell!(Fixnum::build_with(self.b as i64));
@@ -989,10 +989,16 @@ impl MachineState {
and_frame[1] = self.heap[s + 2];
}
}
*/
for index in s + 3..s + 2 + num_cells {
for index in s + 2..s + 2 + num_cells {
if let HeapCellValueTag::CutPoint = self.heap[index].get_tag() {
// adjust cut point to occur after call_continuation.
and_frame[index - (s + 1)] = fixnum_as_cell!(Fixnum::as_cutpoint(self.b as i64));
} else {
and_frame[index - (s + 1)] = self.heap[index];
}
}
self.e = e;
self.p
@@ -5557,13 +5563,13 @@ impl Machine {
#[inline(always)]
pub(crate) fn get_b_value(&mut self) {
let n = Fixnum::build_with(i64::try_from(self.machine_st.b).unwrap());
let n = Fixnum::as_cutpoint(i64::try_from(self.machine_st.b).unwrap());
self.machine_st.unify_fixnum(n, self.machine_st.registers[1]);
}
#[inline(always)]
pub(crate) fn get_cut_point(&mut self) {
let n = Fixnum::build_with(i64::try_from(self.machine_st.b0).unwrap());
let n = Fixnum::as_cutpoint(i64::try_from(self.machine_st.b0).unwrap());
self.machine_st.unify_fixnum(n, self.machine_st.registers[1]);
}

17
src/macros.rs
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@@ -15,7 +15,7 @@ macro_rules! char_as_cell {
macro_rules! fixnum_as_cell {
($n: expr) => {
HeapCellValue::from_bytes($n.into_bytes()) //HeapCellValueTag::Fixnum, $n.get_num() as u64)
HeapCellValue::from_bytes($n.into_bytes())
};
}
@@ -378,6 +378,21 @@ macro_rules! read_heap_cell_pat_body {
#[allow(unused_braces)]
$code
});
($cell:ident, CutPoint, $value:ident, $code:expr) => ({
let $value = Fixnum::from_bytes($cell.into_bytes());
#[allow(unused_braces)]
$code
});
($cell:ident, Fixnum | CutPoint, $value:ident, $code:expr) => ({
let $value = Fixnum::from_bytes($cell.into_bytes());
#[allow(unused_braces)]
$code
});
($cell:ident, CutPoint | Fixnum, $value:ident, $code:expr) => ({
let $value = Fixnum::from_bytes($cell.into_bytes());
#[allow(unused_braces)]
$code
});
($cell:ident, Char, $value:ident, $code:expr) => ({
let $value = unsafe { char::from_u32_unchecked($cell.get_value() as u32) };
#[allow(unused_braces)]

9
src/parser/ast.rs
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@@ -493,6 +493,15 @@ impl Fixnum {
.with_f(false)
}
#[inline]
pub fn as_cutpoint(num: i64) -> Self {
Fixnum::new()
.with_num(u64::from_ne_bytes(num.to_ne_bytes()) & ((1 << 56) - 1))
.with_tag(HeapCellValueTag::CutPoint as u8)
.with_m(false)
.with_f(false)
}
#[inline]
pub fn build_with_checked(num: i64) -> Result<Self, OutOfBounds> {
const UPPER_BOUND: i64 = (1 << 55) - 1;

21
src/types.rs
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@@ -30,6 +30,7 @@ pub enum HeapCellValueTag {
Atom = 0b010111,
PStr = 0b011001,
CStr = 0b011011,
CutPoint = 0b011111,
}
#[derive(BitfieldSpecifier, Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord)]
@@ -50,13 +51,15 @@ pub enum HeapCellValueView {
Atom = 0b010111,
PStr = 0b011001,
CStr = 0b011011,
CutPoint = 0b011111,
// trail elements.
TrailedHeapVar = 0b011101,
TrailedStackVar = 0b011111,
TrailedHeapVar = 0b101111,
TrailedStackVar = 0b101011,
TrailedAttrVar = 0b100001,
TrailedAttrVarListLink = 0b100011,
TrailedAttachedValue = 0b100101,
TrailedBlackboardEntry = 0b100111,
TrailedBlackboardOffset = 0b101001,
TrailedBlackboardOffset = 0b110011,
}
#[derive(BitfieldSpecifier, Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord)]
@@ -189,13 +192,13 @@ pub enum TrailRef {
#[derive(BitfieldSpecifier, Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord)]
#[bits = 6]
pub(crate) enum TrailEntryTag {
TrailedHeapVar = 0b011110,
TrailedStackVar = 0b011111,
TrailedAttrVar = 0b101110,
TrailedHeapVar = 0b101111,
TrailedStackVar = 0b101011,
TrailedAttrVar = 0b100001,
TrailedAttrVarListLink = 0b100011,
TrailedAttachedValue = 0b101010,
TrailedBlackboardEntry = 0b100110,
TrailedBlackboardOffset = 0b100111,
TrailedAttachedValue = 0b100101,
TrailedBlackboardEntry = 0b100111,
TrailedBlackboardOffset = 0b110011,
}
#[bitfield]