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unsafe stack transition

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This commit is contained in:
Mark Thom
2019-11-28 21:22:03 -04:00
parent c219d9ad5f
commit 5723edd765
8 changed files with 49 additions and 45 deletions
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6
src/prolog/machine/machine_indices.rs
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@@ -309,7 +309,7 @@ pub enum REPLCodePtr {
#[derive(Clone, PartialEq)]
pub enum CodePtr {
BuiltInClause(BuiltInClauseType, LocalCodePtr), // local is the successor call.
CallN(usize, LocalCodePtr), // arity, local.
CallN(usize, LocalCodePtr, bool), // arity, local, last call.
Local(LocalCodePtr),
DynamicTransaction(DynamicTransactionType, LocalCodePtr), // the type of transaction, the return pointer.
REPL(REPLCodePtr, LocalCodePtr), // the REPL code, the return pointer.
@@ -320,7 +320,7 @@ impl CodePtr {
pub fn local(&self) -> LocalCodePtr {
match self {
&CodePtr::BuiltInClause(_, ref local)
| &CodePtr::CallN(_, ref local)
| &CodePtr::CallN(_, ref local, _)
| &CodePtr::Local(ref local) => local.clone(),
&CodePtr::VerifyAttrInterrupt(p) => LocalCodePtr::DirEntry(p),
&CodePtr::REPL(_, p) | &CodePtr::DynamicTransaction(_, p) => p,
@@ -418,7 +418,7 @@ impl Add<usize> for CodePtr {
| p @ CodePtr::VerifyAttrInterrupt(_)
| p @ CodePtr::DynamicTransaction(..) => p,
CodePtr::Local(local) => CodePtr::Local(local + rhs),
CodePtr::CallN(_, local) | CodePtr::BuiltInClause(_, local) => {
CodePtr::CallN(_, local, _) | CodePtr::BuiltInClause(_, local) => {
CodePtr::Local(local + rhs)
}
}