Previously, method extractors (getter functions which return
tear-offs) where implemented in the following way:
Method extractor body is an asm intrinsic which loads a few registers
and jumps to BuildMethodExtractor stubs.
BuildMethodExtractor stub loads more registers, calls AllocateClosure
stub and initializes a few fields of a closure (this stub also used
to call AllocateContext but it is no longer needed for tear-offs).
AllocateClosure allocates a closure object and initializes closure
fields.
Instead of doing 2 hops to the object allocation, method extractor
body now calls AllocateClosure stubs directly which initializes
all closure fields. This saves a jump and a handful of instructions
to load certain things on registers and set closure fields.
Assembler intrinsic for method extractor body and
architecture-specific BuildMethodExtractor stubs are now removed.
Also, as method extractors are really tiny, they are now always
inlined.
TEST=ci
Change-Id: Icfeed18414659a76c7d24d3f6f53a76c91e5bbd3
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/356302
Reviewed-by: Martin Kustermann <kustermann@google.com>
Commit-Queue: Alexander Markov <alexmarkov@google.com>
Alexander Markov
b9b341f4a7