Revert "SERVER-32645 Create a shim helper framework."

This reverts commit 2227f272a7a0a3e43625cb2d4a2704e1ccb6f893.

3 files changed, 4 insertions, 296 deletions

diff --git a/src/mongo/base/init.h b/src/mongo/base/init.h
index 50a8eee3529..1d6595592aa 100644
--- a/src/mongo/base/init.h
+++ b/src/mongo/base/init.h
@@ -117,15 +117,15 @@
  * of the function to declare would be options.
  */
 #define MONGO_INITIALIZER_GENERAL(NAME, PREREQUISITES, DEPENDENTS)                        \
-    ::mongo::Status MONGO_INITIALIZER_FUNCTION_NAME_(NAME)(::mongo::InitializerContext*); \
+    ::mongo::Status _MONGO_INITIALIZER_FUNCTION_NAME(NAME)(::mongo::InitializerContext*); \
     namespace {                                                                           \
     ::mongo::GlobalInitializerRegisterer _mongoInitializerRegisterer_##NAME(              \
         std::string(#NAME),                                                               \
         MONGO_MAKE_STRING_VECTOR PREREQUISITES,                                           \
         MONGO_MAKE_STRING_VECTOR DEPENDENTS,                                              \
-        mongo::InitializerFunction(MONGO_INITIALIZER_FUNCTION_NAME_(NAME)));              \
+        mongo::InitializerFunction(_MONGO_INITIALIZER_FUNCTION_NAME(NAME)));              \
     }                                                                                     \
-    ::mongo::Status MONGO_INITIALIZER_FUNCTION_NAME_(NAME)
+    ::mongo::Status _MONGO_INITIALIZER_FUNCTION_NAME(NAME)
 
 /**
  * Macro to define an initializer group.
@@ -143,4 +143,4 @@
  * Macro to produce a name for a mongo initializer function for an initializer operation
  * named "NAME".
  */
-#define MONGO_INITIALIZER_FUNCTION_NAME_(NAME) _mongoInitializerFunction_##NAME
+#define _MONGO_INITIALIZER_FUNCTION_NAME(NAME) _mongoInitializerFunction_##NAME
diff --git a/src/mongo/base/shim.cpp b/src/mongo/base/shim.cpp
deleted file mode 100644
index b5834086563..00000000000
--- a/src/mongo/base/shim.cpp
+++ /dev/null
@@ -1,36 +0,0 @@
-/**
- *    Copyright (C) 2018 MongoDB Inc.
- *
- *    This program is free software: you can redistribute it and/or  modify
- *    it under the terms of the GNU Affero General Public License, version 3,
- *    as published by the Free Software Foundation.
- *
- *    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
- *    GNU Affero General Public License for more details.
- *
- *    You should have received a copy of the GNU Affero General Public License
- *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
- *
- *    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 GNU Affero General 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/base/shim.h"
-
-
-namespace mongo {
-namespace {
-MONGO_INITIALIZER_GROUP(ShimHooks, MONGO_NO_PREREQUISITES, ("default"));
-}  // namespace
-}  // namespace mongo
diff --git a/src/mongo/base/shim.h b/src/mongo/base/shim.h
deleted file mode 100644
index 28437322b8b..00000000000
--- a/src/mongo/base/shim.h
+++ /dev/null
@@ -1,256 +0,0 @@
-/**
- *    Copyright (C) 2018 MongoDB Inc.
- *
- *    This program is free software: you can redistribute it and/or  modify
- *    it under the terms of the GNU Affero General Public License, version 3,
- *    as published by the Free Software Foundation.
- *
- *    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
- *    GNU Affero General Public License for more details.
- *
- *    You should have received a copy of the GNU Affero General Public License
- *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
- *
- *    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 GNU Affero General 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
-
-#include <functional>
-
-#include "mongo/base/init.h"
-
-/**
- * The `SHIM` mechanism allows for the creation of "weak-symbol-like" functions which can have their
- * actual implementation injected in the final binary without creating a link dependency upon any
- * actual implementation.  One uses it like this:
- *
- * In a header:
- * ```
- * class MyClass {
- *   public:
- *     static MONGO_DECLARE_SHIM((int)->std::string) helloWorldFunction;
- * };
- * ```
- *
- * In the corresponding C++ file (which is a link dependency):
- * ```
- * MONGO_DEFINE_SHIM(MyClass::helloWorldFunction);
- * ```
- *
- * And in any number of implementation files:
- * ```
- * MONGO_REGISTER_SHIM(MyClass::helloWorldFunction)(int value)->std::string {
- *     if (value == 42) {
- *         return "Hello World";
- *     } else {
- *         return "No way!";
- *     }
- * }
- * ```
- *
- * This can be useful for making auto-registering and auto-constructing mock and release class
- * factories, among other useful things
- */
-
-namespace mongo {
-template <typename T>
-struct PrivateCall;
-
-/**
- * When declaring shim functions that should be private, they really need to be public; however,
- * this type can be used as a parameter to permit the function to only be called by the type
- * specified in the template parameter.
- */
-template <typename T>
-struct PrivateTo {
-private:
-    friend PrivateCall<T>;
-
-    PrivateTo() = default;
-};
-
-/**
- * When calling shim functions that should be private, you pass an immediately created instance of
- * the type `PrivateCall< T >`, where `T` is the type that `PrivateTo` requires as a template
- * parameter.
- */
-template <typename T>
-struct PrivateCall {
-private:
-    friend T;
-    PrivateCall() {}
-
-public:
-    operator PrivateTo<T>() {
-        return {};
-    }
-};
-}  // namespace mongo
-
-namespace shim_detail {
-/**
- * This type, `storage`, is used as a workaround for needing C++17 `inline` variables.  The template
- * static member is effectively `inline` already.
- */
-template <typename T, typename tag = void>
-struct storage {
-    static T data;
-};
-
-template <typename T, typename tag>
-T storage<T, tag>::data = {};
-}  // namespace shim_detail
-
-#define MONGO_SHIM_DEPENDENTS ("ShimHooks")
-
-namespace mongo {
-#ifdef MONGO_CONFIG_CHECK_SHIM_DEPENDENCIES
-const bool checkShimsViaTUHook = true;
-#define MONGO_SHIM_TU_HOOK(name) \
-    name {}
-#else
-const bool checkShimsViaTUHook = false;
-#define MONGO_SHIM_TU_HOOK(name)
-#endif
-}  // namespace mongo
-
-/**
- * Declare a shimmable function with signature `SHIM_SIGNATURE`.  Declare such constructs in a C++
- * header as static members of a class.
- */
-#define MONGO_DECLARE_SHIM(/*SHIM_SIGNATURE*/...) MONGO_DECLARE_SHIM_1(__LINE__, __VA_ARGS__)
-#define MONGO_DECLARE_SHIM_1(LN, ...) MONGO_DECLARE_SHIM_2(LN, __VA_ARGS__)
-#define MONGO_DECLARE_SHIM_2(LN, ...)                                                             \
-    const struct ShimBasis_##LN {                                                                 \
-        ShimBasis_##LN() = default;                                                               \
-        struct MongoShimImplGuts {                                                                \
-            template <bool required = mongo::checkShimsViaTUHook>                                 \
-            struct AbiCheckType {                                                                 \
-                AbiCheckType() = default;                                                         \
-            };                                                                                    \
-            using AbiCheck = AbiCheckType<>;                                                      \
-            struct LibTUHookTypeBase {                                                            \
-                LibTUHookTypeBase();                                                              \
-            };                                                                                    \
-            template <bool required = mongo::checkShimsViaTUHook>                                 \
-            struct LibTUHookType : LibTUHookTypeBase {};                                          \
-            using LibTUHook = LibTUHookType<>;                                                    \
-            struct ImplTUHookTypeBase {                                                           \
-                ImplTUHookTypeBase();                                                             \
-            };                                                                                    \
-            template <bool required = mongo::checkShimsViaTUHook>                                 \
-            struct ImplTUHookType : ImplTUHookTypeBase {};                                        \
-            using ImplTUHook = ImplTUHookType<>;                                                  \
-                                                                                                  \
-            static auto functionTypeHelper __VA_ARGS__;                                           \
-            /* Workaround for Microsoft -- by taking the address of this function pointer, we     \
-             * avoid the problems that their compiler has with default * arguments in deduced     \
-             * typedefs. */                                                                       \
-            using function_type_pointer = decltype(&MongoShimImplGuts::functionTypeHelper);       \
-            using function_type = std::remove_pointer_t<function_type_pointer>;                   \
-            MongoShimImplGuts* abi(const AbiCheck* const) {                                       \
-                return this;                                                                      \
-            }                                                                                     \
-            MongoShimImplGuts* lib(const LibTUHook* const) {                                      \
-                MONGO_SHIM_TU_HOOK(LibTUHook);                                                    \
-                return this;                                                                      \
-            }                                                                                     \
-            MongoShimImplGuts* impl(const ImplTUHook* const) {                                    \
-                MONGO_SHIM_TU_HOOK(ImplTUHook);                                                   \
-                return this;                                                                      \
-            }                                                                                     \
-            virtual auto implementation __VA_ARGS__ = 0;                                          \
-                                                                                                  \
-            using tag =                                                                           \
-                std::tuple<MongoShimImplGuts::function_type, AbiCheck, LibTUHook, ImplTUHook>;    \
-        };                                                                                        \
-                                                                                                  \
-        using storage = shim_detail::storage<MongoShimImplGuts*, MongoShimImplGuts::tag>;         \
-                                                                                                  \
-        /* TODO: When the dependency graph is fixed, add the `impl()->` call to the call chain */ \
-        template <typename... Args>                                                               \
-        auto operator()(Args&&... args) const                                                     \
-            noexcept(noexcept(storage::data->abi(nullptr)->lib(nullptr)->implementation(          \
-                std::forward<Args>(args)...)))                                                    \
-                -> decltype(storage::data->abi(nullptr)->lib(nullptr)->implementation(            \
-                    std::forward<Args>(args)...)) {                                               \
-            return storage::data->abi(nullptr)->lib(nullptr)->implementation(                     \
-                std::forward<Args>(args)...);                                                     \
-        }                                                                                         \
-    }
-
-/**
- * Define a shimmable function with name `SHIM_NAME`, returning a value of type `RETURN_TYPE`, with
- * any arguments.  This shim definition macro should go in the associated C++ file to the header
- * where a SHIM was defined.  This macro does not emit a function definition, only the customization
- * point's machinery.
- */
-#define MONGO_DEFINE_SHIM(/*SHIM_NAME*/...) MONGO_DEFINE_SHIM_1(__LINE__, __VA_ARGS__)
-#define MONGO_DEFINE_SHIM_1(LN, ...) MONGO_DEFINE_SHIM_2(LN, __VA_ARGS__)
-#define MONGO_DEFINE_SHIM_2(LN, ...)                                                          \
-    namespace {                                                                               \
-    namespace shim_namespace##LN {                                                            \
-        using ShimType = decltype(__VA_ARGS__);                                               \
-    } /*namespace shim_namespace*/                                                            \
-    } /*namespace*/                                                                           \
-    shim_namespace##LN::ShimType::MongoShimImplGuts::LibTUHookTypeBase::LibTUHookTypeBase() = \
-        default;                                                                              \
-    shim_namespace##LN::ShimType __VA_ARGS__{};
-
-#define MONGO_SHIM_EVIL_STRINGIFY_(args) #args
-
-
-/**
- * Define an implementation of a shimmable function with name `SHIM_NAME`.  The compiler will check
- * supplied parameters for correctness.  This shim registration macro should go in the associated
- * C++ implementation file to the header where a SHIM was defined.   Such a file would be a mock
- * implementation or a real implementation, for example
- */
-#define MONGO_REGISTER_SHIM(/*SHIM_NAME*/...) MONGO_REGISTER_SHIM_1(__LINE__, __VA_ARGS__)
-#define MONGO_REGISTER_SHIM_1(LN, ...) MONGO_REGISTER_SHIM_2(LN, __VA_ARGS__)
-#define MONGO_REGISTER_SHIM_2(LN, ...)                                                          \
-    namespace {                                                                                 \
-    namespace shim_namespace##LN {                                                              \
-        using ShimType = decltype(__VA_ARGS__);                                                 \
-                                                                                                \
-        class Implementation final : public ShimType::MongoShimImplGuts {                       \
-            /* Some compilers don't work well with the trailing `override` in this kind of      \
-             * function declaration. */                                                         \
-            ShimType::MongoShimImplGuts::function_type implementation; /* override */           \
-        };                                                                                      \
-                                                                                                \
-        ::mongo::Status createInitializerRegistration(::mongo::InitializerContext* const) {     \
-            static Implementation impl;                                                         \
-            ShimType::storage::data = &impl;                                                    \
-            return Status::OK();                                                                \
-        }                                                                                       \
-                                                                                                \
-        const ::mongo::GlobalInitializerRegisterer registrationHook{                            \
-            std::string(MONGO_SHIM_EVIL_STRINGIFY_((__VA_ARGS__))),                             \
-            {},                                                                                 \
-            {MONGO_SHIM_DEPENDENTS},                                                            \
-            mongo::InitializerFunction(createInitializerRegistration)};                         \
-    } /*namespace shim_namespace*/                                                              \
-    } /*namespace*/                                                                             \
-                                                                                                \
-    shim_namespace##LN::ShimType::MongoShimImplGuts::ImplTUHookTypeBase::ImplTUHookTypeBase() = \
-        default;                                                                                \
-                                                                                                \
-    auto shim_namespace##LN::Implementation::implementation /* After this point someone just    \
-                                                               writes the signature's arguments \
-                                                               and return value (using arrow    \
-                                                               notation).  Then they write the  \
-                                                               body. */