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1efa2cfaba
D97247 added the reverse mapping from unwind destination to their source, but it had a critical bug; sources can be multiple, because multiple BBs can have a single BB as their unwind destination. This changes `WasmEHFuncInfo::getUnwindSrc` to `getUnwindSrcs` and makes it return a vector rather than a single BB. It does not return the const reference to the existing vector but creates a new vector because `WasmEHFuncInfo` stores not `BasicBlock*` or `MachineBasicBlock*` but `PointerUnion` of them. Also I hoped to unify those methods for `BasicBlock` and `MachineBasicBlock` into one using templates to reduce duplication, but failed because various usages require `BasicBlock*` to be `const` but it's hard to make it `const` for `MachineBasicBlock` usages. Fixes https://github.com/emscripten-core/emscripten/issues/13514. (More precisely, fixes https://github.com/emscripten-core/emscripten/issues/13514#issuecomment-784708744) Reviewed By: dschuff, tlively Differential Revision: https://reviews.llvm.org/D97583 |
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