Add computeChainCapacity function to IOBuf

Summary:
This diff adds a computeChainCapacity method to IOBuf.

This method will loop through each chain of an IOBuf and return the total capacity of all IOBuf chains. This method is used very similarly to computeChainDataLength(), except rather than returning total data length, it returns total capacity.

Reviewed By: yfeldblum

Differential Revision: D28875393

fbshipit-source-id: 7e5f4a93916fa6c30eef8f8ee8c346a4537302af

Add rsa_pss signature schemes to SSLCommonOptions

Summary: Required to support RSA certificates in TLS 1.3.

Reviewed By: knekritz

Differential Revision: D28606758

fbshipit-source-id: 0b75eccf207c1327e590675137ce3289956d8771

Add rsa_pss signature schemes to SSLCommonOptions

Summary: Required to support RSA certificates in TLS 1.3.

Reviewed By: knekritz

Differential Revision: D28606758

fbshipit-source-id: 0b75eccf207c1327e590675137ce3289956d8771

Add rsa_pss signature schemes to SSLCommonOptions

Summary: Required to support RSA certificates in TLS 1.3.

Reviewed By: knekritz

Differential Revision: D28606758

fbshipit-source-id: 0b75eccf207c1327e590675137ce3289956d8771

hazptr: Improve documentation

Summary: Improve documentation and make the description of synchronous reclamation  consistent with the current implementation.

Reviewed By: yfeldblum

Differential Revision: D28575528

fbshipit-source-id: e8f37e02d18b12a0e653264c128492a98cba6a1d

fix exception_ptr_get_type for libc++ < v10.0.0-rc2

Summary:
The function `folly::exception_ptr_get_type` under 32-bit arm-ehabi libc++ >= v5.0.1 and < v10.0.0-rc2, is broken because the `__cxa_exception` layout is changed in an incompatible way, with an extra 4 bytes padding incorrectly preceding the unwind field. Shift the `__cxa_exception` pointer before accessing fields through it.

Major thanks to Crystal Jin <crystalj@fb.com> for help debugging the problem and testing the fix.

Differential Revision: D28423734

fbshipit-source-id: fdf67fa5c1056df921fad23f86ae965761603738

Back out "exception_wrapper thrown variant via abi/runtime"

Summary: D26331579 (facebook@aa7f74a) was the offending diff that caused an insta crash on Messenger Android and Instagram Android. Backing out for now.

Reviewed By: JunqiWang

Differential Revision: D28308563

fbshipit-source-id: 87a547d9ba7cb3b33a4ddee9e273943f8379d990

revise exceptionStr

Summary: Revise all overloads of `folly::exceptionStr` in terms of `type_info_of`, `exception_ptr_get_type`, and `exception_ptr_get_object`. No longer rely on `catch_exception` and no longer have inline preprocessor conditionals.

Reviewed By: Orvid, luciang

Differential Revision: D26333081

fbshipit-source-id: 318ce83b9f15a12d5a33f528134e6fb38bb78a62

use only public gmock interface in transport/socket lifecycle observer

Summary: Internals are not portable between versions or across platforms.

Reviewed By: Orvid

Differential Revision: D27990286

fbshipit-source-id: b70d8d3f67a1e5262efa842f70817e3ae3972339

__PRETTY_FUNCTION__ -> __func__ in FOLLY_SAFE_CHECK

Summary:
Storing the `__PRETTY_FUNCTION__` for logging has an unreasonable cost on (non-strippable) binary size for debug builds, as different template instantiation will produce long, demangled, and non-mergeable strings.

If necessary, all the information is retrievable from the debug info (even if the function is inlined), where it's stored in much more efficient form. So, switch to `__func__`, which is stripped.

Reviewed By: yfeldblum, luciang

Differential Revision: D27825136

fbshipit-source-id: d499084c7e7b24db1cd46aa2b03f4a590c6eddc3