tree ba8725c334c05f88bd7ceb82d809d7d090d2a058
parent 24f3bdc31da8557a618566bfa0d176c4234bb228
author Kostya Kortchinsky <kostyak@google.com> 1622747465 -0700
committer Christopher Ferris <cferris@google.com> 1623095554 -0700

[scudo] Rework Vector/String

Some platforms (eg: Trusty) are extremelly memory constrained, which
doesn't necessarily work well with some of Scudo's current assumptions.

`Vector` by default (and as such `String` and `ScopedString`) maps a
page, which is a bit of a waste. This CL changes `Vector` to use a
buffer local to the class first, then potentially map more memory if
needed (`ScopedString` currently are all stack based so it would be
stack data). We also want to allow a platform to prevent any dynamic
resizing, so I added a `CanGrow` templated parameter that for now is
always `true` but would be set to `false` on Trusty.

Differential Revision: https://reviews.llvm.org/D103641

GitOrigin-RevId: 868317b3fd765830c07ecf16cbfcf6c7708adc3c
Change-Id: Ia16abe9b3f18c6a719f1c202a943b1381ea5ecbb