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/*
* 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.
*/
//
// Lowers a module with loads and stores that access a 64-bit memory with
// one that works as-is on wasm32.
//
// TODO(wvo): make this run in parallel if needed.
#include "ir/bits.h"
#include "pass.h"
#include "wasm-builder.h"
#include "wasm.h"
namespace wasm {
struct Memory64Lowering : public WalkerPass<PostWalker<Memory64Lowering>> {
void run(PassRunner* runner, Module* module) override {
if (module->memory.is64()) {
super::run(runner, module);
}
}
void wrapAddress64(Expression*& ptr) {
if (ptr->type == Type::unreachable) {
return;
}
auto& module = *getModule();
assert(module.memory.is64());
assert(ptr->type == Type::i64);
Builder builder(module);
ptr = builder.makeUnary(UnaryOp::WrapInt64, ptr);
}
void extendAddress64(Expression*& ptr) {
if (ptr->type == Type::unreachable) {
return;
}
auto& module = *getModule();
assert(module.memory.is64());
assert(ptr->type == Type::i64);
ptr->type = Type::i32;
Builder builder(module);
ptr = builder.makeUnary(UnaryOp::ExtendUInt32, ptr);
}
void visitLoad(Load* curr) { wrapAddress64(curr->ptr); }
void visitStore(Store* curr) { wrapAddress64(curr->ptr); }
void visitMemorySize(MemorySize* curr) {
auto size = static_cast<Expression*>(curr);
extendAddress64(size);
curr->ptrType = Type::i32;
replaceCurrent(size);
}
void visitMemoryGrow(MemoryGrow* curr) {
wrapAddress64(curr->delta);
auto size = static_cast<Expression*>(curr);
extendAddress64(size);
curr->ptrType = Type::i32;
replaceCurrent(size);
}
void visitMemoryInit(MemoryInit* curr) { wrapAddress64(curr->dest); }
void visitMemoryFill(MemoryFill* curr) {
wrapAddress64(curr->dest);
wrapAddress64(curr->size);
}
void visitMemoryCopy(MemoryCopy* curr) {
wrapAddress64(curr->dest);
wrapAddress64(curr->source);
wrapAddress64(curr->size);
}
void visitMemory(Memory* memory) {
// This is visited last.
memory->indexType = Type::i32;
}
};
Pass* createMemory64LoweringPass() { return new Memory64Lowering(); }
} // namespace wasm
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