Merge pull request #8617 from deannagarcia/sync-stage

Integrate from Piper for C++, Java, and Python
diff --git a/README.md b/README.md
index 118b896..618dc2a 100644
--- a/README.md
+++ b/README.md
@@ -52,18 +52,18 @@
 language, you can find instructions in the corresponding source directory about
 how to install protobuf runtime for that specific language:
 
-| Language                             | Source                                                      | Ubuntu | MacOS | Windows |
-|--------------------------------------|-------------------------------------------------------------|--------|-------|---------|
-| C++ (include C++ runtime and protoc) | [src](src)                                                  | [![Build status](https://storage.googleapis.com/protobuf-kokoro-badges/status-badge/linux-cpp_distcheck.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fubuntu%2Fcpp_distcheck%2Fcontinuous)<br/>[![Build status](https://storage.googleapis.com/protobuf-kokoro-badges/status-badge/linux-bazel.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fubuntu%2Fbazel%2Fcontinuous)<br/>[![Build status](https://storage.googleapis.com/protobuf-kokoro-badges/status-badge/linux-dist_install.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fubuntu%2Fdist_install%2Fcontinuous) | [![Build status](https://storage.googleapis.com/protobuf-kokoro-badges/status-badge/macos-cpp.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fmacos%2Fcpp%2Fcontinuous)<br/>[![Build status](https://storage.googleapis.com/protobuf-kokoro-badges/status-badge/macos-cpp_distcheck.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fmacos%2Fcpp_distcheck%2Fcontinuous) | [![Build status](https://ci.appveyor.com/api/projects/status/73ctee6ua4w2ruin?svg=true)](https://ci.appveyor.com/project/protobuf/protobuf) |
-| Java                                 | [java](java)                                                | [![Build status](https://storage.googleapis.com/protobuf-kokoro-badges/status-badge/linux-java_compatibility.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fubuntu%2Fjava_compatibility%2Fcontinuous)<br/>[![Build status](https://storage.googleapis.com/protobuf-kokoro-badges/status-badge/linux-java_jdk7.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fubuntu%2Fjava_jdk7%2Fcontinuous)<br/>[![Build status](https://storage.googleapis.com/protobuf-kokoro-badges/status-badge/linux-java_oracle7.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fubuntu%2Fjava_oracle7%2Fcontinuous)<br/>[![Build status](https://storage.googleapis.com/protobuf-kokoro-badges/status-badge/linux-java_linkage_monitor.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fubuntu%2Fjava_linkage_monitor%2Fcontinuous) | | |
-| Python                               | [python](python)                                            | [![Build status](https://storage.googleapis.com/protobuf-kokoro-badges/status-badge/linux-python27.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fubuntu%2Fpython27%2Fcontinuous)<br/>[![Build status](https://storage.googleapis.com/protobuf-kokoro-badges/status-badge/linux-python35.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fubuntu%2Fpython35%2Fcontinuous)<br/>[![Build status](https://storage.googleapis.com/protobuf-kokoro-badges/status-badge/linux-python36.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fubuntu%2Fpython36%2Fcontinuous)<br/>[![Build status](https://storage.googleapis.com/protobuf-kokoro-badges/status-badge/linux-python37.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fubuntu%2Fpython37%2Fcontinuous)<br/>[![Build status](https://storage.googleapis.com/protobuf-kokoro-badges/status-badge/linux-python_compatibility.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fubuntu%2Fpython_compatibility%2Fcontinuous)<br/>[![Build status](https://storage.googleapis.com/protobuf-kokoro-badges/status-badge/linux-python27_cpp.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fubuntu%2Fpython27_cpp%2Fcontinuous)<br/>[![Build status](https://storage.googleapis.com/protobuf-kokoro-badges/status-badge/linux-python35_cpp.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fubuntu%2Fpython35_cpp%2Fcontinuous)<br/>[![Build status](https://storage.googleapis.com/protobuf-kokoro-badges/status-badge/linux-python36_cpp.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fubuntu%2Fpython36_cpp%2Fcontinuous)<br/>[![Build status](https://storage.googleapis.com/protobuf-kokoro-badges/status-badge/linux-python37_cpp.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fubuntu%2Fpython37_cpp%2Fcontinuous)<br/>[![Build status](https://storage.googleapis.com/protobuf-kokoro-badges/status-badge/linux-python-release.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fubuntu%2Fpython_release%2Fcontinuous) | [![Build status](https://storage.googleapis.com/protobuf-kokoro-badges/status-badge/macos-python.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fmacos%2Fpython%2Fcontinuous)<br/>[![Build status](https://storage.googleapis.com/protobuf-kokoro-badges/status-badge/macos-python_cpp.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fmacos%2Fpython_cpp%2Fcontinuous)<br/>[![Build status](https://storage.googleapis.com/protobuf-kokoro-badges/status-badge/macos-python-release.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fmacos%2Fpython_release%2Fcontinuous) | [![Build status](https://storage.googleapis.com/protobuf-kokoro-badges/status-badge/windows-python-release.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fwindows%2Fpython_release%2Fcontinuous) |
-| Objective-C                          | [objectivec](objectivec)                                    | | [![Build status](https://storage.googleapis.com/protobuf-kokoro-badges/status-badge/macos-objectivec_cocoapods_integration.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fmacos%2Fobjectivec_cocoapods_integration%2Fcontinuous)<br/>[![Build status](https://storage.googleapis.com/protobuf-kokoro-badges/status-badge/macos-objectivec_ios_debug.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fmacos%2Fobjectivec_ios_debug%2Fcontinuous)<br/>[![Build status](https://storage.googleapis.com/protobuf-kokoro-badges/status-badge/macos-objectivec_ios_release.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fmacos%2Fobjectivec_ios_release%2Fcontinuous)<br/>[![Build status](https://storage.googleapis.com/protobuf-kokoro-badges/status-badge/macos-objectivec_osx.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fmacos%2Fobjectivec_osx%2Fcontinuous) | |
-| C#                                   | [csharp](csharp)                                            | [![Build status](https://storage.googleapis.com/protobuf-kokoro-badges/status-badge/linux-csharp.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fubuntu%2Fcsharp%2Fcontinuous) | | [![Build status](https://ci.appveyor.com/api/projects/status/73ctee6ua4w2ruin?svg=true)](https://ci.appveyor.com/project/protobuf/protobuf)<br/>[![Build status](https://storage.googleapis.com/protobuf-kokoro-badges/status-badge/windows-csharp-release.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fwindows%2Fcsharp_release%2Fcontinuous) |
-| JavaScript                           | [js](js)                                                    | [![Build status](https://storage.googleapis.com/protobuf-kokoro-badges/status-badge/linux-javascript.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fubuntu%2Fjavascript%2Fcontinuous) | [![Build status](https://storage.googleapis.com/protobuf-kokoro-badges/status-badge/macos-javascript.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fmacos%2Fjavascript%2Fcontinuous) | |
-| Ruby                                 | [ruby](ruby)                                                | [![Build status](https://storage.googleapis.com/protobuf-kokoro-badges/status-badge/linux-ruby23.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fubuntu%2Fruby23%2Fcontinuous)<br/>[![Build status](https://storage.googleapis.com/protobuf-kokoro-badges/status-badge/linux-ruby24.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fubuntu%2Fruby24%2Fcontinuous)<br/>[![Build status](https://storage.googleapis.com/protobuf-kokoro-badges/status-badge/linux-ruby25.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fubuntu%2Fruby25%2Fcontinuous)<br/>[![Build status](https://storage.googleapis.com/protobuf-kokoro-badges/status-badge/linux-ruby26.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fubuntu%2Fruby26%2Fcontinuous)<br/>[![Build status](https://storage.googleapis.com/protobuf-kokoro-badges/status-badge/linux-ruby-release.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fubuntu%2Fruby_release%2Fcontinuous) | [![Build status](https://storage.googleapis.com/protobuf-kokoro-badges/status-badge/macos-ruby23.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fmacos%2Fruby23%2Fcontinuous)<br/>[![Build status](https://storage.googleapis.com/protobuf-kokoro-badges/status-badge/macos-ruby24.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fmacos%2Fruby24%2Fcontinuous)<br/>[![Build status](https://storage.googleapis.com/protobuf-kokoro-badges/status-badge/macos-ruby25.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fmacos%2Fruby25%2Fcontinuous)<br/>[![Build status](https://storage.googleapis.com/protobuf-kokoro-badges/status-badge/macos-ruby26.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fmacos%2Fruby26%2Fcontinuous)<br/>[![Build status](https://storage.googleapis.com/protobuf-kokoro-badges/status-badge/macos-ruby-release.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fmacos%2Fruby_release%2Fcontinuous) | |
-| Go                                   | [protocolbuffers/protobuf-go](https://github.com/protocolbuffers/protobuf-go)       | | | |
-| PHP                                  | [php](php)                                                  | [![Build status](https://storage.googleapis.com/protobuf-kokoro-badges/status-badge/linux-php_all.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fubuntu%2Fphp_all%2Fcontinuous)<br/>[![Build status](https://storage.googleapis.com/protobuf-kokoro-badges/status-badge/linux-32-bit.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fubuntu%2F32-bit%2Fcontinuous)<br/>[![Build status](https://storage.googleapis.com/protobuf-kokoro-badges/status-badge/linux-php80.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fubuntu%2Fphp80%2Fcontinuous) | [![Build status](https://storage.googleapis.com/protobuf-kokoro-badges/status-badge/macos-php5.6_mac.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fmacos%2Fphp5.6_mac%2Fcontinuous)<br/>[![Build status](https://storage.googleapis.com/protobuf-kokoro-badges/status-badge/macos-php7.0_mac.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fmacos%2Fphp7.0_mac%2Fcontinuous) | |
-| Dart                                 | [dart-lang/protobuf](https://github.com/dart-lang/protobuf) | [![Build Status](https://travis-ci.org/dart-lang/protobuf.svg?branch=master)](https://travis-ci.org/dart-lang/protobuf) | | |
+| Language                             | Source                                                      |
+|--------------------------------------|-------------------------------------------------------------|
+| C++ (include C++ runtime and protoc) | [src](src)                                                  |
+| Java                                 | [java](java)                                                |
+| Python                               | [python](python)                                            |
+| Objective-C                          | [objectivec](objectivec)                                    |
+| C#                                   | [csharp](csharp)                                            |
+| JavaScript                           | [js](js)                                                    |
+| Ruby                                 | [ruby](ruby)                                                |
+| Go                                   | [protocolbuffers/protobuf-go](https://github.com/protocolbuffers/protobuf-go)|
+| PHP                                  | [php](php)                                                  |
+| Dart                                 | [dart-lang/protobuf](https://github.com/dart-lang/protobuf) |
 
 Quick Start
 -----------
diff --git a/kokoro/linux/aarch64/php_build_and_run_tests_with_qemu_aarch64.sh b/kokoro/linux/aarch64/php_build_and_run_tests_with_qemu_aarch64.sh
new file mode 100755
index 0000000..bcb3d9d
--- /dev/null
+++ b/kokoro/linux/aarch64/php_build_and_run_tests_with_qemu_aarch64.sh
@@ -0,0 +1,18 @@
+#!/bin/bash
+
+set -ex
+
+# Install composer
+curl -sS https://getcomposer.org/installer | php
+mkdir -p "$HOME/bin"
+mv composer.phar "$HOME/bin/composer"
+PATH="$HOME/bin:$PATH"
+
+# go to the repo root
+cd $(dirname $0)/../../..
+
+cd php
+
+composer install
+composer test
+composer test_c
diff --git a/kokoro/linux/aarch64/test_php_aarch64.sh b/kokoro/linux/aarch64/test_php_aarch64.sh
new file mode 100755
index 0000000..b11ef43
--- /dev/null
+++ b/kokoro/linux/aarch64/test_php_aarch64.sh
@@ -0,0 +1,31 @@
+#!/bin/bash
+
+set -ex
+
+# go to the repo root
+cd $(dirname $0)/../../..
+
+# there is no php testing docker image readily available, so we build
+# our own. It's a aarch64 image, but that's fine since qemu will
+# automatically be used to run the commands in the dockerfile.
+docker build -t testimage_protobuf_php_arm64v8 kokoro/linux/aarch64/testimage_protobuf_php_arm64v8
+
+if [[ -t 0 ]]; then
+  DOCKER_TTY_ARGS="-it"
+else
+  # The input device on kokoro is not a TTY, so -it does not work.
+  DOCKER_TTY_ARGS=
+fi
+
+# crosscompile protoc as we will later need it for the php build.
+# we build it under the dockcross/manylinux2014-aarch64 image so that the resulting protoc binary is compatible
+# with a wide range of linux distros (including any docker images we will use later to build and test php)
+kokoro/linux/aarch64/dockcross_helpers/run_dockcross_manylinux2014_aarch64.sh kokoro/linux/aarch64/protoc_crosscompile_aarch64.sh
+
+# use an actual aarch64 docker image (with a real aarch64 php) to run build & test protobuf php under an emulator
+# * mount the protobuf root as /work to be able to access the crosscompiled files
+# * to avoid running the process inside docker as root (which can pollute the workspace with files owned by root), we force
+#   running under current user's UID and GID. To be able to do that, we need to provide a home directory for the user
+#   otherwise the UID would be homeless under the docker container and pip install wouldn't work. For simplicity,
+#   we just run map the user's home to a throwaway temporary directory
+docker run $DOCKER_TTY_ARGS --rm --user "$(id -u):$(id -g)" -e "HOME=/home/fake-user" -v "$(mktemp -d):/home/fake-user" -v "$(pwd)":/work -w /work testimage_protobuf_php_arm64v8 kokoro/linux/aarch64/php_build_and_run_tests_with_qemu_aarch64.sh
diff --git a/kokoro/linux/aarch64/testimage_protobuf_php_arm64v8/Dockerfile b/kokoro/linux/aarch64/testimage_protobuf_php_arm64v8/Dockerfile
new file mode 100644
index 0000000..eae1bbc
--- /dev/null
+++ b/kokoro/linux/aarch64/testimage_protobuf_php_arm64v8/Dockerfile
@@ -0,0 +1,3 @@
+FROM arm64v8/debian:buster
+
+RUN apt-get update && apt-get install -y php7.3-cli php7.3-dev php7.3-bcmath composer phpunit curl git valgrind && apt-get clean
diff --git a/kokoro/linux/php_aarch64/build.sh b/kokoro/linux/php_aarch64/build.sh
new file mode 100755
index 0000000..eba8b55
--- /dev/null
+++ b/kokoro/linux/php_aarch64/build.sh
@@ -0,0 +1,16 @@
+#!/bin/bash
+#
+# This is the top-level script we give to Kokoro as the entry point for
+# running the "continuous" and "presubmit" jobs.
+
+set -ex
+
+# Change to repo root
+cd $(dirname $0)/../../..
+
+# Initialize any submodules.
+git submodule update --init --recursive
+
+kokoro/linux/aarch64/qemu_helpers/prepare_qemu.sh
+
+kokoro/linux/aarch64/test_php_aarch64.sh
diff --git a/kokoro/linux/php_aarch64/continuous.cfg b/kokoro/linux/php_aarch64/continuous.cfg
new file mode 100644
index 0000000..ff20682
--- /dev/null
+++ b/kokoro/linux/php_aarch64/continuous.cfg
@@ -0,0 +1,11 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/linux/php_aarch64/build.sh"
+timeout_mins: 120
+
+action {
+  define_artifacts {
+    regex: "**/sponge_log.xml"
+  }
+}
diff --git a/kokoro/linux/php_aarch64/presubmit.cfg b/kokoro/linux/php_aarch64/presubmit.cfg
new file mode 100644
index 0000000..ff20682
--- /dev/null
+++ b/kokoro/linux/php_aarch64/presubmit.cfg
@@ -0,0 +1,11 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/linux/php_aarch64/build.sh"
+timeout_mins: 120
+
+action {
+  define_artifacts {
+    regex: "**/sponge_log.xml"
+  }
+}
diff --git a/src/google/protobuf/stubs/port.h b/src/google/protobuf/stubs/port.h
index eec96fa..bead0af 100644
--- a/src/google/protobuf/stubs/port.h
+++ b/src/google/protobuf/stubs/port.h
@@ -263,14 +263,14 @@
 
 #ifndef bswap_64
 static inline uint64 bswap_64(uint64 x) {
-  return (((x & uint64_t{0xFFu)) << 56) |
-          ((x & uint64_t{0xFF00u)) << 40) |
-          ((x & uint64_t{0xFF0000u)) << 24) |
-          ((x & uint64_t{0xFF000000u)) << 8) |
-          ((x & uint64_t{0xFF00000000u)) >> 8) |
-          ((x & uint64_t{0xFF0000000000u)) >> 24) |
-          ((x & uint64_t{0xFF000000000000u)) >> 40) |
-          ((x & uint64_t{0xFF00000000000000u)) >> 56));
+  return (((x & uint64_t{0xFFu}) << 56) |
+          ((x & uint64_t{0xFF00u}) << 40) |
+          ((x & uint64_t{0xFF0000u}) << 24) |
+          ((x & uint64_t{0xFF000000u}) << 8) |
+          ((x & uint64_t{0xFF00000000u}) >> 8) |
+          ((x & uint64_t{0xFF0000000000u}) >> 24) |
+          ((x & uint64_t{0xFF000000000000u}) >> 40) |
+          ((x & uint64_t{0xFF00000000000000u}) >> 56));
 }
 #define bswap_64(x) bswap_64(x)
 #endif