1 files changed, 0 insertions, 103 deletions
diff --git a/src/passes/ReplaceStackPointer.cpp b/src/passes/ReplaceStackPointer.cpp
deleted file mode 100644
index da57f8c3d..000000000
--- a/src/passes/ReplaceStackPointer.cpp
+++ /dev/null
@@ -1,103 +0,0 @@
-/*
- * Copyright 2020 WebAssembly Community Group participants
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-//
-// Convert llvm's stack pointer usage from from global.get/global.set into
-// cals to external stackSave/stackRestore.
-// This is needed to emscripten SIDE_MODULE code where mutable global imports
-// are not yet permitted by default.
-//
-
-#include "abi/js.h"
-#include "ir/import-utils.h"
-#include "pass.h"
-#include "support/debug.h"
-#include "wasm-emscripten.h"
-
-#define DEBUG_TYPE "replace-stack-pointer"
-
-namespace wasm {
-
-static Name STACK_SAVE("stackSave");
-static Name STACK_RESTORE("stackRestore");
-
-struct ReplaceStackPointer
-  : public WalkerPass<PostWalker<ReplaceStackPointer>> {
-  void visitGlobalGet(GlobalGet* curr) {
-    if (getModule()->getGlobalOrNull(curr->name) == stackPointer) {
-      needStackSave = true;
-      if (!builder) {
-        builder = make_unique<Builder>(*getModule());
-      }
-      replaceCurrent(builder->makeCall(STACK_SAVE, {}, Type::i32));
-    }
-  }
-
-  void visitGlobalSet(GlobalSet* curr) {
-    if (getModule()->getGlobalOrNull(curr->name) == stackPointer) {
-      needStackRestore = true;
-      if (!builder) {
-        builder = make_unique<Builder>(*getModule());
-      }
-      replaceCurrent(
-        builder->makeCall(STACK_RESTORE, {curr->value}, Type::none));
-    }
-  }
-
-  void doWalkModule(Module* module) {
-    stackPointer = getStackPointerGlobal(*module);
-    if (!stackPointer) {
-      BYN_DEBUG(std::cerr << "no stack pointer found\n");
-      return;
-    }
-    BYN_DEBUG(std::cerr << "stack pointer found\n");
-    super::doWalkModule(module);
-    if (needStackSave) {
-      ensureFunctionImport(
-        module, STACK_SAVE, Signature(Type::none, Type::i32));
-    }
-    if (needStackRestore) {
-      ensureFunctionImport(
-        module, STACK_RESTORE, Signature(Type::i32, Type::none));
-    }
-    // Finally remove the stack pointer global itself. This avoids importing
-    // a mutable global.
-    module->removeGlobal(stackPointer->name);
-  }
-
-  void ensureFunctionImport(Module* module, Name name, Signature sig) {
-    ImportInfo info(*module);
-    if (info.getImportedFunction(ENV, name)) {
-      return;
-    }
-    auto import = new Function;
-    import->name = name;
-    import->module = ENV;
-    import->base = name;
-    import->sig = sig;
-    module->addFunction(import);
-  }
-
-private:
-  std::unique_ptr<Builder> builder;
-  Global* stackPointer = nullptr;
-  bool needStackSave = false;
-  bool needStackRestore = false;
-};
-
-Pass* createReplaceStackPointerPass() { return new ReplaceStackPointer; }
-
-} // namespace wasm