Export of internal Abseil changes

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e7f53dfbf809812e84770217777f81b6308a3084 by Abseil Team <absl-team@google.com>:

Add a parameter pack to absl profile to allow profiles to separate
dynamic data from static data that is available at constructor-time.

Background: `inline_element_size` is effectively constant, but there
is a data race between its initialization and its access. We had fixed that race by making
inline_element_size atomic.  This CL changes `inline_element_size`
back to a non-atomic integer, and provides a way for all profiles to
provide Register()-time values.
PiperOrigin-RevId: 413960559

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70234c5943f8e37e17c1d9c54d8ed61d39880abf by Chris Kennelly <ckennelly@google.com>:

Document that absl::FunctionRef does not allocate.

PiperOrigin-RevId: 413946831

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3308ae571412c4be3cc32d088c6edac98ff2d1ed by Samuel Benzaquen <sbenza@google.com>:

Internal change

PiperOrigin-RevId: 413933619

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1617093a730d055edcf7bc04fdd6509783f5f75d by Martijn Vels <mvels@google.com>:

Internal Change

PiperOrigin-RevId: 413778735

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03ad683f059c806a6c8b04f5b79b2662c3df8c73 by Evan Brown <ezb@google.com>:

Unify btree erase_if definitions and optimize them so that we only do rebalancing once per leaf node.

PiperOrigin-RevId: 413757280

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5ba402f70801938178e486617063f01c7862525d by Martijn Vels <mvels@google.com>:

Cleanup up cord sampling internals

PiperOrigin-RevId: 413755011

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522da8f9d3e0f11630d89fb41952004742bc335a by Evan Brown <ezb@google.com>:

Add b-tree benchmark for erase_if.

Since this benchmark doesn't work for std:: containers before C++20, disable it for them.

PiperOrigin-RevId: 413740844

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a690ea42de8ed4a761d00235d8b2fb7548ba9732 by Andy Getzendanner <durandal@google.com>:

Import of CCTZ from GitHub.

PiperOrigin-RevId: 413735737
GitOrigin-RevId: e7f53dfbf809812e84770217777f81b6308a3084
Change-Id: I4f9f9039ba92831bc48971964aa063244c9fed72

1 files changed, 6 insertions, 12 deletions

diff --git a/absl/container/internal/hashtablez_sampler.cc b/absl/container/internal/hashtablez_sampler.cc
index a3e15a70..1d24db5f 100644
--- a/absl/container/internal/hashtablez_sampler.cc
+++ b/absl/container/internal/hashtablez_sampler.cc
@@ -61,13 +61,10 @@ HashtablezSampler& GlobalHashtablezSampler() {
   return *sampler;
 }
 
-// TODO(bradleybear): The comments at this constructors declaration say that the
-// fields are not initialized, but this definition does initialize the fields.
-// Something needs to be cleaned up.
-HashtablezInfo::HashtablezInfo() { PrepareForSampling(); }
+HashtablezInfo::HashtablezInfo() = default;
 HashtablezInfo::~HashtablezInfo() = default;
 
-void HashtablezInfo::PrepareForSampling() {
+void HashtablezInfo::PrepareForSampling(size_t inline_element_size_value) {
   capacity.store(0, std::memory_order_relaxed);
   size.store(0, std::memory_order_relaxed);
   num_erases.store(0, std::memory_order_relaxed);
@@ -85,6 +82,7 @@ void HashtablezInfo::PrepareForSampling() {
   // instead.
   depth = absl::GetStackTrace(stack, HashtablezInfo::kMaxStackDepth,
                               /* skip_count= */ 0);
+  inline_element_size = inline_element_size_value;
 }
 
 static bool ShouldForceSampling() {
@@ -110,9 +108,8 @@ static bool ShouldForceSampling() {
 HashtablezInfo* SampleSlow(int64_t* next_sample, size_t inline_element_size) {
   if (ABSL_PREDICT_FALSE(ShouldForceSampling())) {
     *next_sample = 1;
-    HashtablezInfo* result = GlobalHashtablezSampler().Register();
-    result->inline_element_size.store(inline_element_size,
-                                      std::memory_order_relaxed);
+    HashtablezInfo* result =
+        GlobalHashtablezSampler().Register(inline_element_size);
     return result;
   }
 
@@ -138,10 +135,7 @@ HashtablezInfo* SampleSlow(int64_t* next_sample, size_t inline_element_size) {
     return SampleSlow(next_sample, inline_element_size);
   }
 
-  HashtablezInfo* result = GlobalHashtablezSampler().Register();
-  result->inline_element_size.store(inline_element_size,
-                                    std::memory_order_relaxed);
-  return result;
+  return GlobalHashtablezSampler().Register(inline_element_size);
 #endif
 }