fix UB in dom tree builder

2025-06-04 09:18:24 +03:00
parent b454858647
commit c6a0c73287
2 changed files with 4 additions and 8 deletions
--- a/src/CFGraph/IR_domTree.cpp
+++ b/src/CFGraph/IR_domTree.cpp
@@ -64,6 +64,8 @@ namespace SAPFOR {
            int w = vertex[i];

            for (BasicBlock* v : vertices[w]->getPrev()) {
+                if (dfs_num[v] == -1)
+                    continue;
                int u = Eval(dfs_num[v]);

                if (semi[u] < semi[w])
@@ -97,4 +99,4 @@ namespace SAPFOR {
    void buildDominatorTree(std::vector<BasicBlock*>& blocks) {
        DominatorFinder finder(blocks);
    }
-}
+}