Yingwei Zheng c94bd96c27 [Clang][CodeGen] Don't emit assumptions if current block is unreachable. (#106936) ...

Fixes https://github.com/llvm/llvm-project/issues/106898.

When emitting an infinite loop, clang codegen will delete the whole
block and leave builder's current block as nullptr:

837ee5b46a/clang/lib/CodeGen/CGStmt.cpp (L597-L600)

Then clang will create `zext (icmp slt %a, %b)` without parent block for
`a < b`. It will crash here:

837ee5b46a/clang/lib/CodeGen/CGExprScalar.cpp (L416-L420)

Even if we disabled this optimization, it still crashes in
`Builder.CreateAssumption`:

837ee5b46a/llvm/lib/IR/IRBuilder.cpp (L551-L561)

This patch disables assumptions emission if current block is null.

2024-09-04 13:36:32 +08:00

121 KiB

Raw Blame History

View Raw