[Strings] stringview access operations (#4798)

1 files changed, 26 insertions, 0 deletions

diff --git a/src/ir/effects.h b/src/ir/effects.h
index 393285924..7045d9382 100644
--- a/src/ir/effects.h
+++ b/src/ir/effects.h
@@ -751,6 +751,32 @@ private:
       // traps when ref is null.
       parent.implicitTrap = true;
     }
+    void visitStringWTF8Advance(StringWTF8Advance* curr) {
+      // traps when ref is null.
+      parent.implicitTrap = true;
+    }
+    void visitStringWTF16Get(StringWTF16Get* curr) {
+      // traps when ref is null.
+      parent.implicitTrap = true;
+    }
+    void visitStringIterNext(StringIterNext* curr) {
+      // traps when ref is null.
+      parent.implicitTrap = true;
+      // modifies state in the iterator. we model that as accessing heap memory
+      // in an array atm TODO consider adding a new effect type for this (we
+      // added one for arrays because struct/array operations often interleave,
+      // say with vtable accesses, but it's not clear adding overhead to this
+      // class is worth it for string iters)
+      parent.readsArray = true;
+      parent.writesArray = true;
+    }
+    void visitStringIterMove(StringIterMove* curr) {
+      // traps when ref is null.
+      parent.implicitTrap = true;
+      // see StringIterNext.
+      parent.readsArray = true;
+      parent.writesArray = true;
+    }
   };
 
 public: