Export of internal Abseil changes

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66a0a46462692378f77518f9db766a218bfac40b by Derek Mauro <dmauro@google.com>:

Internal change

PiperOrigin-RevId: 300565981

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2a1ad67662b2e22beec7d3be019e6bba23c41c7f by Derek Mauro <dmauro@google.com>:

Fix CompressedTuple move constructor on MSVC
Imports GitHub #637

PiperOrigin-RevId: 300545840

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a3ee3ad036bbb6b0031121fd58299e5c59a243e1 by Derek Mauro <dmauro@google.com>:

Disable LLVM's XRay instrumentation on Android
Fixes #626

PiperOrigin-RevId: 300540906

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87999244b1f825e585ec12a431086cb60daeb24f by Gennadiy Rozental <rogeeff@google.com>:

Increase max cord depth by 2.
After reviewing of the paper we can prove that the algorithm in fact can lead to slightly larger max depth.

PiperOrigin-RevId: 300422376

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98de175ee8ad33290ef883c167c2de4414a11007 by Abseil Team <absl-team@google.com>:

Use *opt/opt-> instead of opt.value() in an example, after checking the optional has a value.

PiperOrigin-RevId: 300253502

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1107aa0acf0fe743ef50173e02e48f0d4eb572ef by Derek Mauro <dmauro@google.com>:

Stop overriding the default system C++ dialect in CMake

CMake on MacOS has some very strange defaults, like Wno-c++11-extensions,
and doesn't seem to respect CMAKE_CXX_STANDARD, so use CMAKE_CXX_FLAGS instead.

PiperOrigin-RevId: 300180753
GitOrigin-RevId: 66a0a46462692378f77518f9db766a218bfac40b
Change-Id: Icd7b84c49306441b012cb87f244cc92a11697db8

1 files changed, 7 insertions, 3 deletions

diff --git a/absl/strings/cord_test.cc b/absl/strings/cord_test.cc
index d6e091f8b24e..f2d81d4c40d0 100644
--- a/absl/strings/cord_test.cc
+++ b/absl/strings/cord_test.cc
@@ -1403,12 +1403,16 @@ TEST(CordChunkIterator, Operations) {
 }
 
 TEST(CordChunkIterator, MaxLengthFullTree) {
+  // Start with a 1-byte cord, and then double its length in a loop.  We should
+  // be able to do this until the point where we would overflow size_t.
+
   absl::Cord cord;
   size_t size = 1;
   AddExternalMemory("x", &cord);
   EXPECT_EQ(cord.size(), size);
 
-  for (int i = 0; i < 63; ++i) {
+  const int kCordLengthDoublingLimit = std::numeric_limits<size_t>::digits - 1;
+  for (int i = 0; i < kCordLengthDoublingLimit; ++i) {
     cord.Prepend(absl::Cord(cord));
     size <<= 1;
 
@@ -1431,7 +1435,7 @@ TEST(CordChunkIterator, MaxDepth) {
   AddExternalMemory("x", &left_child);
   absl::Cord root = left_child;
 
-  for (int i = 0; i < 91; ++i) {
+  for (int i = 0; i < absl::cord_internal::MaxCordDepth() - 2; ++i) {
     size_t new_size = left_child.size() + root.size();
     root.Prepend(left_child);
     EXPECT_EQ(root.size(), new_size);
@@ -1442,7 +1446,7 @@ TEST(CordChunkIterator, MaxDepth) {
     std::swap(left_child, root);
   }
 
-  EXPECT_DEATH_IF_SUPPORTED(root.Prepend(left_child), "Cord depth exceeds max");
+  EXPECT_DEATH_IF_SUPPORTED(root.Prepend(left_child), "Cord is too long");
 }
 
 TEST(CordCharIterator, Traits) {