search for: dealloca

Here are some comments. It seems to me there are 2 (mostly separate) aspects: 1. Teaching clang how to do domination / post-domination analysis, so that the lifetime information (alloca/dealloca, or lifetime markers) can be set in the right locations in the IR. Such an analysis should be able to understand the language scopes, as well as labels / gotos and EH. The results of this analysis would be used at IR codegen. Caveat: I have no expertise in this area of Clang, so take everything...

The LRM (http://llvm.org/docs/LangRef.html#llvm-lifetime-start-intrinsic) essentially states that: - ptr is dead before a call to "lifetime.start size, ptr" - ptr is dead after a call to "lifetime.end size, ptr" This is all good and fine, and the expected use case is that all "lifetime.end size, ptr" markers are matched with a preceding "lifetime.start