Clang crashes segmentation fault due to stack overflow on deeply nested expressions

[bricknerb]

For example, if you do ~10,000 nested expression calls like this one:

a.foo().foo().foo() ...

You will get a segmentation fault crash.

[llvmbot]

@llvm/issue-subscribers-clang-codegen

Author: Boaz Brickner (bricknerb)

For example, if you do 1,000 nested expression calls like this one:

a.foo().foo().foo() ...

You will get a segmentation fault crash.

[tbaederr]

Is this based on an actual crash or just theoretical?

[bricknerb]

Yes, clang actually crashed on actual use case we had.
More details are in swiftlang/swift#76387.