Support for stack protectors.#60933

Merged

eeckstein merged 11 commits intoswiftlang:mainfrom

eeckstein:stack-protectors

Sep 8, 2022

Commits on Sep 8, 2022

Swift AccessUtils: improve ergonomics of `getAccessPathWithScope`
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SIL: add the `SILFunction.needsStackProtection` flag
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SIL: add `needsStackProtection` flags for `address_to_pointer` and `index_addr` instructions.
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AST: add a `BuiltinUnprotectedAddressOf` language feature
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IRGen: move the `EnableStackProtector` option from IRGenOptions to SILOptions.
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stdlib: add underscored "withUnprotected..Pointer" functions
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stdlib: opt out of stack protection in places where there can't be buffer overflows.
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Swift SIL: add `BuiltinInst.ID.stackAlloc`
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Swift Optimizer: add the StackProtection optimization
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IRGen: add `sppreq` instead of `sspstrong` for functions which need stack protection.
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stdlib: use `_withUnprotected...` functions instead of `Builtin.unprotectedAddressOf`
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