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[heap] Provide memory order relaxed accessor of page flags.

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Bug: chromium:874437,chromium:852420
Change-Id: I4f484a6bb7072804dbcaacab77d25ba7a3fe338f
Reviewed-on: https://chromium-review.googlesource.com/1183188
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Hannes Payer <hpayer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55287}
This commit is contained in:
Hannes Payer 2018-08-21 11:54:28 +02:00 committed by Commit Bot
parent e987606a8a
commit f29fbf35a9
1 changed files with 12 additions and 2 deletions
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14
src/heap/spaces.h
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@ -568,7 +568,10 @@ class MemoryChunk {
void SetFlag(Flag flag) { SetFlags(flag, flag); }
bool IsFlagSet(Flag flag) { return (flags() & flag) != 0; }
template <AccessMode access_mode = AccessMode::NON_ATOMIC>
bool IsFlagSet(Flag flag) {
return (flags<access_mode>() & flag) != 0;
}
void ClearFlag(Flag flag) { flags_ &= ~flag; }
// Set or clear multiple flags at a time. The flags in the mask are set to
@ -583,7 +586,14 @@ class MemoryChunk {
}
// Return all current flags.
uintptr_t flags() { return flags_; }
template <AccessMode access_mode = AccessMode::NON_ATOMIC>
uintptr_t flags() {
if (access_mode == AccessMode::NON_ATOMIC) {
return flags_;
} else {
return flags_.load(std::memory_order_relaxed);
}
}
bool NeverEvacuate() { return IsFlagSet(NEVER_EVACUATE); }