Implement the asan:stack statement

This statement allows programmers to reserve a memory range for the
stack. This is useful to reserve a memory region which is not attached
to any variable, and:

1. It is a way to safely reserve space on the $0100 page.
2. The --stats/--write-info flags will be able to add up the memory
   space reserved for the stack.
3. Future tooling might be able to use this value as a way to detect
   stack overflows.

Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/lib/xixanta/src/node.rs b/lib/xixanta/src/node.rs
index 7a5cf3d..3803840 100644
--- a/lib/xixanta/src/node.rs
+++ b/lib/xixanta/src/node.rs
@@ -1,4 +1,5 @@
 use std::fmt;
+use std::ops::Range;
 
 /// Returns true if this String follows the naming
 /// conventions as expected by the address sanitizer.
@@ -264,6 +265,7 @@ pub enum OperationType {
 pub enum CommentType {
     AsanReserveIdentifier(PString),
     AsanReserve(usize),
+    AsanStack(Range<usize>),
     AsanIgnore,
 }
 
@@ -366,6 +368,7 @@ impl fmt::Display for NodeType {
             NodeType::Comment(ct) => match ct {
                 CommentType::AsanReserveIdentifier(_) => write!(f, ";; asan:reserve"),
                 CommentType::AsanReserve(_) => write!(f, ";; asan:reserve"),
+                CommentType::AsanStack(_) => write!(f, ";; asan:stack"),
                 CommentType::AsanIgnore => write!(f, ";; asan:ignore"),
             },
         }