Dave Bartolomeo af443569d9 C++: Fix handling of accesses to escaped variables in Aliased SSA ...

This fixes a subtle bug in the construction of aliased SSA. `getResultMemoryAccess` was failing to return a `MemoryAccess` for a store to a variable whose address escaped. This is because no `VirtualIRVariable` was being created for such variables. The code was assuming that any access to such a variable would be via `UnknownMemoryAccess`. The result is that accesses to such variables were not being modeled in SSA at all.

Instead, the way to handle this is to have a `VariableMemoryAccess` even when the variable being accessed has escaped, and to have `VariableMemoryAccess::getVirtualVariable()` return the `UnknownVirtualVariable` for escaped variables. In the future, this will also let us be less conservative about inserting `Chi` nodes, because we'll be able to determine that there's an exact overlap between two accesses to the same escaped variable in some cases.

2018-11-30 12:15:19 -08:00

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src

C++: Fix handling of accesses to escaped variables in Aliased SSA

2018-11-30 12:15:19 -08:00

test

C++: Fix handling of accesses to escaped variables in Aliased SSA

2018-11-30 12:15:19 -08:00