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Reland "Use preserve_most calling conventions for Zone::Expand"

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This is a reland of commit 48fee7d232.
We now use the "COMPONENT_BUILD" macro to disable preserve_all, which
covers more uses (like building libbase or libplatform, where we would
otherwise have to check for BUILDING_V8_BASE_SHARED or
BUILDING_V8_PLATFORM_SHARED).

Original change's description:
> Use preserve_most calling conventions for Zone::NewExpand
>
> The zone uses bump allocation in the fast-path, and falls back to
> allocating a new segment if there is not enough space.
> Since this is rarely executed and zone allocations happen a lot, we
> should mark `Zone::NewExpand` as "preserve_most" to make
> `Zone::Allocate` as fast and slim as possible.
>
> R=bikineev@chromium.org, leszeks@chromium.org
>
> Change-Id: I0d592a35440bc3d61ca04425fc2f98c8a8bbbaae
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/4146436
> Reviewed-by: Leszek Swirski <leszeks@chromium.org>
> Reviewed-by: Anton Bikineev <bikineev@chromium.org>
> Commit-Queue: Clemens Backes <clemensb@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#85258}

Change-Id: I1413d47d84f384a724850a6f5b60adf75bba84f8
Cq-Include-Trybots: luci.v8.try:v8_win64_dbg
Cq-Include-Trybots: luci.v8.try:v8_win_compile_rel
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/4162931
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Reviewed-by: Anton Bikineev <bikineev@chromium.org>
Cr-Commit-Position: refs/heads/main@{#85310}
This commit is contained in:
Clemens Backes 2023-01-13 17:49:26 +01:00 committed by V8 LUCI CQ
parent 601913ded3
commit cfdb4e0791
2 changed files with 2 additions and 2 deletions
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2
include/v8config.h
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@ -351,7 +351,7 @@ path. Add it with -I<path> to the command line
// for now.
#if (defined(_M_X64) || defined(__x86_64__) || defined(__AARCH64EL__) || \
defined(_M_ARM64)) /* x64 or arm64 */ \
&& !defined(BUILDING_V8_SHARED) && !defined(USING_V8_SHARED)
&& !defined(COMPONENT_BUILD)
# define V8_HAS_ATTRIBUTE_PRESERVE_MOST (__has_attribute(preserve_most))
#endif
# define V8_HAS_ATTRIBUTE_VISIBILITY (__has_attribute(visibility))

2
src/zone/zone.h
View File

@ -235,7 +235,7 @@ class V8_EXPORT_PRIVATE Zone final {
// Expand the Zone to hold at least 'size' more bytes.
// Should only be called if there is not enough room in the Zone already.
V8_NOINLINE void Expand(size_t size);
V8_NOINLINE V8_PRESERVE_MOST void Expand(size_t size);
// The free region in the current (front) segment is represented as
// the half-open interval [position, limit). The 'position' variable