llvm-context: do not trap zero length OOB heap access (#389)

Fixes https://github.com/paritytech/contract-issues/issues/120 --------- Signed-off-by: xermicus <cyrill@parity.io>
2026-06-12 17:31:02 +00:00 · 2025-10-15 22:39:42 +02:00
parent 2090830858
commit f46bea6a96
8 changed files with 62 additions and 12 deletions
@@ -0,0 +1,36 @@
+// SPDX-License-Identifier: MIT
+
+pragma solidity ^0.8.24;
+
+/* runner.json
+{
+  "differential": true,
+  "actions": [
+    {
+      "Instantiate": {
+        "code": {
+          "Solidity": {
+            "contract": "MemoryBounds"
+          }
+        }
+      }
+    },
+    {
+      "Call": {
+        "dest": {
+          "Instantiated": 0
+        }
+      }
+    }
+  ]
+}
+*/
+
+contract MemoryBounds {
+    fallback() external {
+        assembly {
+            // Accessing OOB offsets should always work when the length is 0.
+            return(100000, 0)
+        }
+    }
+}