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WPD currently assumes that there is a one to one correspondence between type test assume sequences and virtual calls. However, with -fstrict-vtable-pointers this may not be true. This ends up causing crashes when we try to optimize a virtual call more than once ( applyUniformRetValOpt()/applyUniqueRetValOpt()/applyVirtualConstProp()/applySingleImplDevirt()). applySingleImplDevirt() actually didn't previous crash because it would replace the devirtualized call with the same direct call. Adding an assert that the call is indirect causes the corresponding test to crash with the rest of the patch. This makes Chrome successfully build with -fstrict-vtable-pointers + WPD. Reviewed By: tejohnson Differential Revision: https://reviews.llvm.org/D104798 |
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