SERVER-27507 Add basic visibility support and a test

13 files changed, 592 insertions, 7 deletions

diff --git a/SConstruct b/SConstruct
index a111a1d39dd..c29b0ac94c5 100644
--- a/SConstruct
+++ b/SConstruct
@@ -537,6 +537,15 @@ add_option('libdeps-linting',
     type='choice',
 )
 
+add_option('experimental-visibility-support',
+    choices=['on', 'off'],
+    const='on',
+    default='off',
+    help='Enable visibility annotations (experimental)',
+    nargs='?',
+    type='choice',
+)
+
 try:
     with open("version.json", "r") as version_fp:
         version_data = json.load(version_fp)
@@ -1431,8 +1440,9 @@ if use_libunwind == True:
 
 # Windows can't currently support anything other than 'object' or 'static', until
 # we have annotated functions for export.
-if env.TargetOSIs('windows') and link_model not in ['object', 'static', 'dynamic-sdk']:
-    env.FatalError("Windows builds must use the 'object', 'dynamic-sdk', or 'static' link models")
+if env.TargetOSIs('windows') and get_option('experimental-visibility-support') != 'on':
+    if link_model not in ['object', 'static', 'dynamic-sdk']:
+        env.FatalError("Windows builds must use the 'object', 'dynamic-sdk', or 'static' link models")
 
 # The 'object' mode for libdeps is enabled by setting _LIBDEPS to $_LIBDEPS_OBJS. The other two
 # modes operate in library mode, enabled by setting _LIBDEPS to $_LIBDEPS_LIBS.
@@ -1453,6 +1463,39 @@ env['BUILDERS']['SharedArchive'] = SCons.Builder.Builder(
 
 if link_model.startswith("dynamic"):
 
+    if link_model == "dynamic" and get_option('experimental-visibility-support') == 'on':
+
+        def visibility_cppdefines_generator(target, source, env, for_signature):
+            if not 'MONGO_API_NAME' in env:
+                return None
+            return "MONGO_API_${MONGO_API_NAME}"
+
+        env['MONGO_VISIBILITY_CPPDEFINES_GENERATOR'] = visibility_cppdefines_generator
+
+        def visibility_shccflags_generator(target, source, env, for_signature):
+            if env.get('MONGO_API_NAME'):
+                return "-fvisibility=hidden"
+            return None
+        if not env.TargetOSIs('windows'):
+            env['MONGO_VISIBILITY_SHCCFLAGS_GENERATOR'] = visibility_shccflags_generator
+
+        env.AppendUnique(
+            CPPDEFINES=[
+                'MONGO_USE_VISIBILITY',
+                '$MONGO_VISIBILITY_CPPDEFINES_GENERATOR',
+            ],
+            SHCCFLAGS=[
+                '$MONGO_VISIBILITY_SHCCFLAGS_GENERATOR',
+            ],
+            SHCXXFLAGS=[
+                # TODO: This has broader implications and seems not to
+                # work right now at least on macOS. We should
+                # investigate further in the future.
+                #
+                # '-fvisibility-inlines-hidden' if not env.TargetOSIs('windows') else [],
+            ],
+        )
+
     def library(env, target, source, *args, **kwargs):
         sharedLibrary = env.SharedLibrary(target, source, *args, **kwargs)
         sharedArchive = env.SharedArchive(target, source=sharedLibrary[0].sources, *args, **kwargs)
@@ -1872,6 +1915,12 @@ elif env.TargetOSIs('windows'):
         # have these, but we don't want to fix them up before we roll
         # over to C++17.
         "/wd5041",
+
+        # C4251: This warning attempts to prevent usage of CRT (C++
+        # standard library) types in DLL interfaces. That is a good
+        # idea for DLLs you ship to others, but in our case, we know
+        # that all DLLs are built consistently. Suppress the warning.
+        "/wd4251",
     ])
 
     # mozjs-60 requires the following
@@ -4646,6 +4695,13 @@ cachePrune = env.Command(
 
 env.AlwaysBuild(cachePrune)
 
+# Add a trivial Alias called `configure`. This makes it simple to run,
+# or re-run, the SConscript reading and conf tests, but not build any
+# real targets. This can be helpful when you are planning a dry-run
+# build, or simply want to validate your changes to SConstruct, tools,
+# and all the other setup that happens before we begin a real graph
+# walk.
+env.Alias('configure', None)
 
 # We have finished all SConscripts and targets, so we can ask
 # auto_install_binaries to finalize the installation setup.
diff --git a/site_scons/libdeps.py b/site_scons/libdeps.py
index 63d1aeaa62e..4e2d1723a9c 100644
--- a/site_scons/libdeps.py
+++ b/site_scons/libdeps.py
@@ -714,6 +714,13 @@ def __get_node_with_ixes(env, node, node_builder_type):
     except KeyError:
         prefix = node_builder.get_prefix(env)
         suffix = node_builder.get_suffix(env)
+
+        # TODO(SERVER-50681): Find a way to do this that doesn't hard
+        # code these extensions. See the code review for SERVER-27507
+        # for additional discussion.
+        if suffix == ".dll":
+            suffix = ".lib"
+
         __get_node_with_ixes.node_type_ixes[cache_key] = (prefix, suffix)
 
     node_with_ixes = SCons.Util.adjustixes(node, prefix, suffix)
diff --git a/site_scons/site_tools/auto_install_binaries.py b/site_scons/site_tools/auto_install_binaries.py
index 136b0e5b393..d42cd3cba7b 100644
--- a/site_scons/site_tools/auto_install_binaries.py
+++ b/site_scons/site_tools/auto_install_binaries.py
@@ -268,12 +268,13 @@ def scan_for_transitive_install(node, env, _path):
         if base_base_entry.files:
             results.update(base_base_entry.files)
 
-    installed_children = [
+    installed_children = set(
         grandchild
         for child in node.children()
-        for grandchild in child.children()
-        if grandchild.has_builder()
-    ]
+        for direct_children in child.children()
+        for grandchild in direct_children.get_executor().get_all_targets()
+        if direct_children.get_executor() and grandchild.has_builder()
+    )
 
     for child in installed_children:
         auto_installed_files = get_auto_installed_files(env, child)
diff --git a/src/mongo/platform/SConscript b/src/mongo/platform/SConscript
index 648445c0746..e898e9642e7 100644
--- a/src/mongo/platform/SConscript
+++ b/src/mongo/platform/SConscript
@@ -1,6 +1,10 @@
 # -*- mode: python -*-
 
-Import("env")
+Import([
+    "env",
+    "get_option",
+])
+
 env = env.Clone()
 env.CppUnitTest(
     target='platform_test',
@@ -29,3 +33,77 @@ env.Benchmark(
     ],
 )
 
+if not get_option("link-model") == "dynamic":
+    Return()
+
+env.Library(
+    target="visibility_test_libcommon",
+    source=[
+        "visibility_test_libcommon.cpp",
+    ],
+    LIBDEPS=[],
+    DISABLE_ALLOCATOR_SHIM_INJECTION=True,
+    MONGO_API_NAME="visibility_test_libcommon",
+)
+
+env.Library(
+    target="visibility_test_lib1",
+    source=[
+        "visibility_test_lib1.cpp"
+    ],
+    LIBDEPS=[],
+    LIBDEPS_PRIVATE=[
+        "visibility_test_libcommon",
+    ],
+    DISABLE_ALLOCATOR_SHIM_INJECTION=True,
+    MONGO_API_NAME="visibility_test_lib1",
+)
+
+env.Library(
+    target="visibility_test_lib2",
+    source=[
+        "visibility_test_lib2.cpp"
+    ],
+    LIBDEPS=[
+        "visibility_test_lib1",
+    ],
+    LIBDEPS_PRIVATE=[
+        "visibility_test_libcommon",
+    ],
+    DISABLE_ALLOCATOR_SHIM_INJECTION=True,
+    MONGO_API_NAME="visibility_test_lib2",
+)
+
+visibility_test1 = env.Program(
+    target="visibility_test1",
+    source=[
+        "visibility_test1.cpp",
+    ],
+    LIBDEPS=[
+        "visibility_test_lib1",
+    ],
+    DISABLE_ALLOCATOR_SHIM_INJECTION=True,
+    AIB_COMPONENT="visibility-test",
+    AIB_COMPONENTS_EXTRA=[
+        "unittests",
+        "tests",
+    ],
+)
+env.RegisterTest("$UNITTEST_LIST", visibility_test1[0])
+
+visibility_test2 = env.Program(
+    target="visibility_test2",
+    source=[
+        "visibility_test2.cpp",
+    ],
+    LIBDEPS=[
+        "visibility_test_lib2",
+    ],
+    DISABLE_ALLOCATOR_SHIM_INJECTION=True,
+    AIB_COMPONENT="visibility-test",
+    AIB_COMPONENTS_EXTRA=[
+        "unittests",
+        "tests",
+    ],
+)
+env.RegisterTest("$UNITTEST_LIST", visibility_test2[0])
diff --git a/src/mongo/platform/visibility.h b/src/mongo/platform/visibility.h
new file mode 100644
index 00000000000..b251ab705e0
--- /dev/null
+++ b/src/mongo/platform/visibility.h
@@ -0,0 +1,62 @@
+/**
+ *    Copyright (C) 2020-present MongoDB, Inc.
+ *
+ *    This program is free software: you can redistribute it and/or modify
+ *    it under the terms of the Server Side Public License, version 1,
+ *    as published by MongoDB, Inc.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    Server Side Public License for more details.
+ *
+ *    You should have received a copy of the Server Side Public License
+ *    along with this program. If not, see
+ *    <http://www.mongodb.com/licensing/server-side-public-license>.
+ *
+ *    As a special exception, the copyright holders give permission to link the
+ *    code of portions of this program with the OpenSSL library under certain
+ *    conditions as described in each individual source file and distribute
+ *    linked combinations including the program with the OpenSSL library. You
+ *    must comply with the Server Side Public License in all respects for
+ *    all of the code used other than as permitted herein. If you modify file(s)
+ *    with this exception, you may extend this exception to your version of the
+ *    file(s), but you are not obligated to do so. If you do not wish to do so,
+ *    delete this exception statement from your version. If you delete this
+ *    exception statement from all source files in the program, then also delete
+ *    it in the license file.
+ */
+
+#pragma once
+
+#if !defined(MONGO_USE_VISIBILITY)
+
+#define MONGO_VISIBILITY_PUBLIC()
+#define MONGO_VISIBILITY_PRIVATE()
+#define MONGO_PRIVATE
+#define MONGO_API(LIB)
+
+#else
+
+#if defined(_MSC_VER)
+
+#include <boost/preprocessor/control/iif.hpp>
+#include <boost/vmd/is_number.hpp>
+
+#define MONGO_DLLEXPORT() __declspec(dllexport)
+#define MONGO_DLLIMPORT() __declspec(dllimport)
+#define MONGO_PRIVATE
+#define MONGO_API_IMPL2(COND) BOOST_PP_IIF(COND, MONGO_DLLEXPORT, MONGO_DLLIMPORT)()
+#define MONGO_API_IMPL(ARG) MONGO_API_IMPL2(BOOST_VMD_IS_NUMBER(ARG))
+#define MONGO_API(LIB) MONGO_API_IMPL(MONGO_API_##LIB)
+
+#else
+
+#define MONGO_VISIBILITY_PUBLIC() __attribute__((visibility("default")))
+#define MONGO_VISIBILITY_PRIVATE() __attribute__((visibility("hidden")))
+#define MONGO_PRIVATE MONGO_VISIBILITY_PRIVATE()
+#define MONGO_API(LIB) MONGO_VISIBILITY_PUBLIC()
+
+#endif
+
+#endif
diff --git a/src/mongo/platform/visibility_test1.cpp b/src/mongo/platform/visibility_test1.cpp
new file mode 100644
index 00000000000..33341d8a5e0
--- /dev/null
+++ b/src/mongo/platform/visibility_test1.cpp
@@ -0,0 +1,39 @@
+/**
+ *    Copyright (C) 2020-present MongoDB, Inc.
+ *
+ *    This program is free software: you can redistribute it and/or modify
+ *    it under the terms of the Server Side Public License, version 1,
+ *    as published by MongoDB, Inc.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    Server Side Public License for more details.
+ *
+ *    You should have received a copy of the Server Side Public License
+ *    along with this program. If not, see
+ *    <http://www.mongodb.com/licensing/server-side-public-license>.
+ *
+ *    As a special exception, the copyright holders give permission to link the
+ *    code of portions of this program with the OpenSSL library under certain
+ *    conditions as described in each individual source file and distribute
+ *    linked combinations including the program with the OpenSSL library. You
+ *    must comply with the Server Side Public License in all respects for
+ *    all of the code used other than as permitted herein. If you modify file(s)
+ *    with this exception, you may extend this exception to your version of the
+ *    file(s), but you are not obligated to do so. If you do not wish to do so,
+ *    delete this exception statement from your version. If you delete this
+ *    exception statement from all source files in the program, then also delete
+ *    it in the license file.
+ */
+
+#include "mongo/platform/basic.h"
+
+#include "mongo/platform/visibility_test_lib1.h"
+
+#include <cstdlib>
+
+int main(int argc, char* argv[]) {
+    mongo::visibility_test_lib1::Base b("hello");
+    return (b.name() == "hello") ? EXIT_SUCCESS : EXIT_FAILURE;
+}
diff --git a/src/mongo/platform/visibility_test2.cpp b/src/mongo/platform/visibility_test2.cpp
new file mode 100644
index 00000000000..baf69b36412
--- /dev/null
+++ b/src/mongo/platform/visibility_test2.cpp
@@ -0,0 +1,39 @@
+/**
+ *    Copyright (C) 2020-present MongoDB, Inc.
+ *
+ *    This program is free software: you can redistribute it and/or modify
+ *    it under the terms of the Server Side Public License, version 1,
+ *    as published by MongoDB, Inc.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    Server Side Public License for more details.
+ *
+ *    You should have received a copy of the Server Side Public License
+ *    along with this program. If not, see
+ *    <http://www.mongodb.com/licensing/server-side-public-license>.
+ *
+ *    As a special exception, the copyright holders give permission to link the
+ *    code of portions of this program with the OpenSSL library under certain
+ *    conditions as described in each individual source file and distribute
+ *    linked combinations including the program with the OpenSSL library. You
+ *    must comply with the Server Side Public License in all respects for
+ *    all of the code used other than as permitted herein. If you modify file(s)
+ *    with this exception, you may extend this exception to your version of the
+ *    file(s), but you are not obligated to do so. If you do not wish to do so,
+ *    delete this exception statement from your version. If you delete this
+ *    exception statement from all source files in the program, then also delete
+ *    it in the license file.
+ */
+
+#include "mongo/platform/basic.h"
+
+#include "mongo/platform/visibility_test_lib2.h"
+
+#include <cstdlib>
+
+int main(int argc, char* argv[]) {
+    mongo::visibility_test_lib2::Derived d("hello", argc);
+    return (d.value() == argc) ? EXIT_SUCCESS : EXIT_FAILURE;
+}
diff --git a/src/mongo/platform/visibility_test_lib1.cpp b/src/mongo/platform/visibility_test_lib1.cpp
new file mode 100644
index 00000000000..073f743c2af
--- /dev/null
+++ b/src/mongo/platform/visibility_test_lib1.cpp
@@ -0,0 +1,55 @@
+/**
+ *    Copyright (C) 2020-present MongoDB, Inc.
+ *
+ *    This program is free software: you can redistribute it and/or modify
+ *    it under the terms of the Server Side Public License, version 1,
+ *    as published by MongoDB, Inc.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    Server Side Public License for more details.
+ *
+ *    You should have received a copy of the Server Side Public License
+ *    along with this program. If not, see
+ *    <http://www.mongodb.com/licensing/server-side-public-license>.
+ *
+ *    As a special exception, the copyright holders give permission to link the
+ *    code of portions of this program with the OpenSSL library under certain
+ *    conditions as described in each individual source file and distribute
+ *    linked combinations including the program with the OpenSSL library. You
+ *    must comply with the Server Side Public License in all respects for
+ *    all of the code used other than as permitted herein. If you modify file(s)
+ *    with this exception, you may extend this exception to your version of the
+ *    file(s), but you are not obligated to do so. If you do not wish to do so,
+ *    delete this exception statement from your version. If you delete this
+ *    exception statement from all source files in the program, then also delete
+ *    it in the license file.
+ */
+
+#include "mongo/platform/basic.h"
+
+#include "mongo/platform/visibility_test_lib1.h"
+
+#include <stdexcept>
+
+#include "mongo/platform/visibility_test_libcommon.h"
+
+namespace mongo {
+namespace visibility_test_lib1 {
+
+Base::Base(const std::string& name) : _name(name) {
+    _validate(_name);
+}
+
+std::string_view Base::name() const {
+    return _name;
+}
+
+void Base::_validate(std::string_view name) {
+    if (!visibility_test_libcommon::validate(name))
+        throw std::logic_error("Invalid name");
+}
+
+}  // namespace visibility_test_lib1
+}  // namespace mongo
diff --git a/src/mongo/platform/visibility_test_lib1.h b/src/mongo/platform/visibility_test_lib1.h
new file mode 100644
index 00000000000..d35ff10e4e6
--- /dev/null
+++ b/src/mongo/platform/visibility_test_lib1.h
@@ -0,0 +1,50 @@
+/**
+ *    Copyright (C) 2020-present MongoDB, Inc.
+ *
+ *    This program is free software: you can redistribute it and/or modify
+ *    it under the terms of the Server Side Public License, version 1,
+ *    as published by MongoDB, Inc.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    Server Side Public License for more details.
+ *
+ *    You should have received a copy of the Server Side Public License
+ *    along with this program. If not, see
+ *    <http://www.mongodb.com/licensing/server-side-public-license>.
+ *
+ *    As a special exception, the copyright holders give permission to link the
+ *    code of portions of this program with the OpenSSL library under certain
+ *    conditions as described in each individual source file and distribute
+ *    linked combinations including the program with the OpenSSL library. You
+ *    must comply with the Server Side Public License in all respects for
+ *    all of the code used other than as permitted herein. If you modify file(s)
+ *    with this exception, you may extend this exception to your version of the
+ *    file(s), but you are not obligated to do so. If you do not wish to do so,
+ *    delete this exception statement from your version. If you delete this
+ *    exception statement from all source files in the program, then also delete
+ *    it in the license file.
+ */
+
+#include <string>
+#include <string_view>
+
+#include "mongo/platform/visibility.h"
+
+namespace mongo {
+namespace visibility_test_lib1 {
+
+class MONGO_API(visibility_test_lib1) Base {
+public:
+    explicit Base(const std::string& name);
+    std::string_view name() const;
+
+private:
+    MONGO_PRIVATE static void _validate(std::string_view);
+
+    std::string _name;
+};
+
+}  // namespace visibility_test_lib1
+}  // namespace mongo
diff --git a/src/mongo/platform/visibility_test_lib2.cpp b/src/mongo/platform/visibility_test_lib2.cpp
new file mode 100644
index 00000000000..0fc9d9d9f65
--- /dev/null
+++ b/src/mongo/platform/visibility_test_lib2.cpp
@@ -0,0 +1,55 @@
+/**
+ *    Copyright (C) 2020-present MongoDB, Inc.
+ *
+ *    This program is free software: you can redistribute it and/or modify
+ *    it under the terms of the Server Side Public License, version 1,
+ *    as published by MongoDB, Inc.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    Server Side Public License for more details.
+ *
+ *    You should have received a copy of the Server Side Public License
+ *    along with this program. If not, see
+ *    <http://www.mongodb.com/licensing/server-side-public-license>.
+ *
+ *    As a special exception, the copyright holders give permission to link the
+ *    code of portions of this program with the OpenSSL library under certain
+ *    conditions as described in each individual source file and distribute
+ *    linked combinations including the program with the OpenSSL library. You
+ *    must comply with the Server Side Public License in all respects for
+ *    all of the code used other than as permitted herein. If you modify file(s)
+ *    with this exception, you may extend this exception to your version of the
+ *    file(s), but you are not obligated to do so. If you do not wish to do so,
+ *    delete this exception statement from your version. If you delete this
+ *    exception statement from all source files in the program, then also delete
+ *    it in the license file.
+ */
+
+#include "mongo/platform/basic.h"
+
+#include "mongo/platform/visibility_test_lib2.h"
+
+#include <stdexcept>
+
+#include "mongo/platform/visibility_test_libcommon.h"
+
+namespace mongo {
+namespace visibility_test_lib2 {
+
+Derived::Derived(const std::string& name, double value) : Base(name), _value(value) {
+    _validate(_value);
+}
+
+double Derived::value() const {
+    return _value;
+}
+
+void Derived::_validate(double value) {
+    if (!visibility_test_libcommon::validate(value))
+        throw std::logic_error("Invalid value");
+}
+
+}  // namespace visibility_test_lib2
+}  // namespace mongo
diff --git a/src/mongo/platform/visibility_test_lib2.h b/src/mongo/platform/visibility_test_lib2.h
new file mode 100644
index 00000000000..94143460cec
--- /dev/null
+++ b/src/mongo/platform/visibility_test_lib2.h
@@ -0,0 +1,49 @@
+/**
+ *    Copyright (C) 2020-present MongoDB, Inc.
+ *
+ *    This program is free software: you can redistribute it and/or modify
+ *    it under the terms of the Server Side Public License, version 1,
+ *    as published by MongoDB, Inc.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    Server Side Public License for more details.
+ *
+ *    You should have received a copy of the Server Side Public License
+ *    along with this program. If not, see
+ *    <http://www.mongodb.com/licensing/server-side-public-license>.
+ *
+ *    As a special exception, the copyright holders give permission to link the
+ *    code of portions of this program with the OpenSSL library under certain
+ *    conditions as described in each individual source file and distribute
+ *    linked combinations including the program with the OpenSSL library. You
+ *    must comply with the Server Side Public License in all respects for
+ *    all of the code used other than as permitted herein. If you modify file(s)
+ *    with this exception, you may extend this exception to your version of the
+ *    file(s), but you are not obligated to do so. If you do not wish to do so,
+ *    delete this exception statement from your version. If you delete this
+ *    exception statement from all source files in the program, then also delete
+ *    it in the license file.
+ */
+
+
+#include "mongo/platform/visibility.h"
+#include "mongo/platform/visibility_test_lib1.h"
+
+namespace mongo {
+namespace visibility_test_lib2 {
+
+class MONGO_API(visibility_test_lib2) Derived : public visibility_test_lib1::Base {
+public:
+    explicit Derived(const std::string& name, double value);
+    double value() const;
+
+private:
+    MONGO_PRIVATE static void _validate(double);
+
+    double _value;
+};
+
+}  // namespace visibility_test_lib2
+}  // namespace mongo
diff --git a/src/mongo/platform/visibility_test_libcommon.cpp b/src/mongo/platform/visibility_test_libcommon.cpp
new file mode 100644
index 00000000000..112554a4a99
--- /dev/null
+++ b/src/mongo/platform/visibility_test_libcommon.cpp
@@ -0,0 +1,53 @@
+/**
+ *    Copyright (C) 2020-present MongoDB, Inc.
+ *
+ *    This program is free software: you can redistribute it and/or modify
+ *    it under the terms of the Server Side Public License, version 1,
+ *    as published by MongoDB, Inc.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    Server Side Public License for more details.
+ *
+ *    You should have received a copy of the Server Side Public License
+ *    along with this program. If not, see
+ *    <http://www.mongodb.com/licensing/server-side-public-license>.
+ *
+ *    As a special exception, the copyright holders give permission to link the
+ *    code of portions of this program with the OpenSSL library under certain
+ *    conditions as described in each individual source file and distribute
+ *    linked combinations including the program with the OpenSSL library. You
+ *    must comply with the Server Side Public License in all respects for
+ *    all of the code used other than as permitted herein. If you modify file(s)
+ *    with this exception, you may extend this exception to your version of the
+ *    file(s), but you are not obligated to do so. If you do not wish to do so,
+ *    delete this exception statement from your version. If you delete this
+ *    exception statement from all source files in the program, then also delete
+ *    it in the license file.
+ */
+
+#include "mongo/platform/basic.h"
+
+#include "mongo/platform/visibility_test_libcommon.h"
+
+#include <stdexcept>
+
+namespace mongo {
+namespace visibility_test_libcommon {
+
+namespace {
+const std::string_view kInvalidStringView = "invalid";
+const double kInvalidDouble = -1;
+}  // namespace
+
+bool validate(std::string_view data) {
+    return data != kInvalidStringView;
+}
+
+bool validate(double data) {
+    return data != kInvalidDouble;
+}
+
+}  // namespace visibility_test_libcommon
+}  // namespace mongo
diff --git a/src/mongo/platform/visibility_test_libcommon.h b/src/mongo/platform/visibility_test_libcommon.h
new file mode 100644
index 00000000000..feb77f996fb
--- /dev/null
+++ b/src/mongo/platform/visibility_test_libcommon.h
@@ -0,0 +1,41 @@
+/**
+ *    Copyright (C) 2020-present MongoDB, Inc.
+ *
+ *    This program is free software: you can redistribute it and/or modify
+ *    it under the terms of the Server Side Public License, version 1,
+ *    as published by MongoDB, Inc.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    Server Side Public License for more details.
+ *
+ *    You should have received a copy of the Server Side Public License
+ *    along with this program. If not, see
+ *    <http://www.mongodb.com/licensing/server-side-public-license>.
+ *
+ *    As a special exception, the copyright holders give permission to link the
+ *    code of portions of this program with the OpenSSL library under certain
+ *    conditions as described in each individual source file and distribute
+ *    linked combinations including the program with the OpenSSL library. You
+ *    must comply with the Server Side Public License in all respects for
+ *    all of the code used other than as permitted herein. If you modify file(s)
+ *    with this exception, you may extend this exception to your version of the
+ *    file(s), but you are not obligated to do so. If you do not wish to do so,
+ *    delete this exception statement from your version. If you delete this
+ *    exception statement from all source files in the program, then also delete
+ *    it in the license file.
+ */
+
+#include <string_view>
+
+#include "mongo/platform/visibility.h"
+
+namespace mongo {
+namespace visibility_test_libcommon {
+
+MONGO_API(visibility_test_libcommon) bool validate(std::string_view data);
+MONGO_API(visibility_test_libcommon) bool validate(double data);
+
+}  // namespace visibility_test_libcommon
+}  // namespace mongo