tree 4c0b531a34aec78459124be67ce96c37a182caf6
parent 11e432d3924f0e4a58e7b5d552426d4f709475e6
author Nicolas Capens <capn@google.com> 1653584300 -0400
committer Nicolas Capens <nicolascapens@google.com> 1653661903 +0000

Add a pragma option to zero-initialize Reactor local variables

MemorySanitizer errors in Reactor routines are either caused by
uninitialized heap allocations, incorrect instrumentation (false
positives), or uninitialized local variables (including shader
variables). To help confirm or eliminate the latter as a possible
cause, as well as to provide a convenient means to locate the
uninitialized variable through a divide-and-conquer strategy, this
change provides the `InitializeLocalVariables` pragma.

It is only supported by the LLVM backend, since this is also the only
backend which supports MemorySanitizer instrumentation.

Bug: b/191149148
Change-Id: I2f58c171e20bbcc19afdbc88bf61bf04a5bf477f
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/53688
Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>
Kokoro-Result: kokoro <noreply+kokoro@google.com>