Remove separate Table64Lowering pass (#7131)

This pass is now just part of Memory64Lowering.

Once this lands we can remove the `--table64-lowering` flag from
emscripten. Because I've used an alias here there will be some interim
period where emscripten will run this pass twice since it passed both
flags. However, this will only be temporary and that second run will be
a no-op since the first one will remove the feature.

1 files changed, 0 insertions, 155 deletions

diff --git a/src/passes/Table64Lowering.cpp b/src/passes/Table64Lowering.cpp
deleted file mode 100644
index 1167515de..000000000
--- a/src/passes/Table64Lowering.cpp
+++ /dev/null
@@ -1,155 +0,0 @@
-/*
- * Copyright 2024 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.
- */
-
-//
-// Lowers a module with a 64-bit table to one with a 32-bit table.
-//
-// This pass can be deleted once table64 is implemented in Wasm engines:
-// https://github.com/WebAssembly/memory64/issues/51
-//
-
-#include "ir/bits.h"
-#include "ir/import-utils.h"
-#include "pass.h"
-#include "wasm-builder.h"
-#include "wasm.h"
-
-namespace wasm {
-
-static Name TABLE_BASE("__table_base");
-static Name TABLE_BASE32("__table_base32");
-
-struct Table64Lowering : public WalkerPass<PostWalker<Table64Lowering>> {
-
-  void wrapAddress64(Expression*& ptr, Name tableName) {
-    if (ptr->type == Type::unreachable) {
-      return;
-    }
-    auto& module = *getModule();
-    auto* table = module.getTable(tableName);
-    if (table->is64()) {
-      assert(ptr->type == Type::i64);
-      ptr = Builder(module).makeUnary(UnaryOp::WrapInt64, ptr);
-    }
-  }
-
-  void extendAddress64(Expression*& ptr, Name tableName) {
-    if (ptr->type == Type::unreachable) {
-      return;
-    }
-    auto& module = *getModule();
-    auto* table = module.getTable(tableName);
-    if (table->is64()) {
-      assert(ptr->type == Type::i64);
-      ptr->type = Type::i32;
-      ptr = Builder(module).makeUnary(UnaryOp::ExtendUInt32, ptr);
-    }
-  }
-
-  void visitTableSize(TableSize* curr) {
-    auto& module = *getModule();
-    auto* table = module.getTable(curr->table);
-    if (table->is64()) {
-      auto* size = static_cast<Expression*>(curr);
-      extendAddress64(size, curr->table);
-      replaceCurrent(size);
-    }
-  }
-
-  void visitTableGrow(TableGrow* curr) {
-    auto& module = *getModule();
-    auto* table = module.getTable(curr->table);
-    if (table->is64()) {
-      wrapAddress64(curr->delta, curr->table);
-      auto* size = static_cast<Expression*>(curr);
-      extendAddress64(size, curr->table);
-      replaceCurrent(size);
-    }
-  }
-
-  void visitTableFill(TableFill* curr) {
-    wrapAddress64(curr->dest, curr->table);
-    wrapAddress64(curr->size, curr->table);
-  }
-
-  void visitTableCopy(TableCopy* curr) {
-    wrapAddress64(curr->dest, curr->destTable);
-    wrapAddress64(curr->source, curr->sourceTable);
-    wrapAddress64(curr->size, curr->destTable);
-  }
-
-  void visitTableInit(TableInit* curr) {
-    wrapAddress64(curr->dest, curr->table);
-  }
-
-  void visitCallIndirect(CallIndirect* curr) {
-    wrapAddress64(curr->target, curr->table);
-  }
-
-  void visitElementSegment(ElementSegment* segment) {
-    auto& module = *getModule();
-
-    // Passive segments don't have any offset to update.
-    if (segment->table.isNull() || !module.getTable(segment->table)->is64()) {
-      return;
-    }
-
-    if (auto* c = segment->offset->dynCast<Const>()) {
-      c->value = Literal(static_cast<uint32_t>(c->value.geti64()));
-      c->type = Type::i32;
-    } else if (auto* get = segment->offset->dynCast<GlobalGet>()) {
-      auto* g = module.getGlobal(get->name);
-      if (g->imported() && g->base == TABLE_BASE) {
-        ImportInfo info(module);
-        auto* memoryBase32 = info.getImportedGlobal(g->module, TABLE_BASE32);
-        if (!memoryBase32) {
-          Builder builder(module);
-          memoryBase32 = builder
-                           .makeGlobal(TABLE_BASE32,
-                                       Type::i32,
-                                       builder.makeConst(int32_t(0)),
-                                       Builder::Immutable)
-                           .release();
-          memoryBase32->module = g->module;
-          memoryBase32->base = TABLE_BASE32;
-          module.addGlobal(memoryBase32);
-        }
-        // Use this alternative import when initializing the segment.
-        assert(memoryBase32);
-        get->type = Type::i32;
-        get->name = memoryBase32->name;
-      }
-    } else {
-      WASM_UNREACHABLE("unexpected elem offset");
-    }
-  }
-
-  void run(Module* module) override {
-    Super::run(module);
-    // Don't modify the tables themselves until after the traversal since we
-    // that would require tables to be the last thing that get visited, and
-    // we don't want to depend on that specific ordering.
-    for (auto& table : module->tables) {
-      if (table->is64()) {
-        table->addressType = Type::i32;
-      }
-    }
-  }
-};
-
-Pass* createTable64LoweringPass() { return new Table64Lowering(); }
-
-} // namespace wasm