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//=== WebAssemblyRefTypeMem2Local.cpp - WebAssembly RefType Mem2Local -----===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
///
/// \file
/// Assign reference type allocas to local addrspace (addrspace(1)) so that
/// their loads and stores can be lowered to local.gets/local.sets.
///
//===----------------------------------------------------------------------===//
#include "Utils/WasmAddressSpaces.h"
#include "Utils/WebAssemblyTypeUtilities.h"
#include "WebAssembly.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/InstVisitor.h"
#include "llvm/IR/ValueHandle.h"
#include "llvm/Pass.h"
using namespace llvm;
#define DEBUG_TYPE "wasm-ref-type-mem2local"
namespace {
class WebAssemblyRefTypeMem2Local final
: public FunctionPass,
public InstVisitor<WebAssemblyRefTypeMem2Local> {
StringRef getPassName() const override {
return "WebAssembly Reference Types Memory to Local";
}
void getAnalysisUsage(AnalysisUsage &AU) const override {
AU.setPreservesCFG();
FunctionPass::getAnalysisUsage(AU);
}
bool runOnFunction(Function &F) override;
bool Changed = false;
public:
static char ID;
WebAssemblyRefTypeMem2Local() : FunctionPass(ID) {}
void visitAllocaInst(AllocaInst &AI);
};
} // End anonymous namespace
char WebAssemblyRefTypeMem2Local::ID = 0;
INITIALIZE_PASS(WebAssemblyRefTypeMem2Local, DEBUG_TYPE,
"Assign reference type allocas to local address space", true,
false)
FunctionPass *llvm::createWebAssemblyRefTypeMem2Local() {
return new WebAssemblyRefTypeMem2Local();
}
void WebAssemblyRefTypeMem2Local::visitAllocaInst(AllocaInst &AI) {
if (WebAssembly::isWebAssemblyReferenceType(AI.getAllocatedType())) {
Changed = true;
IRBuilder<> IRB(AI.getContext());
IRB.SetInsertPoint(&AI);
auto *NewAI = IRB.CreateAlloca(AI.getAllocatedType(),
WebAssembly::WASM_ADDRESS_SPACE_VAR, nullptr,
AI.getName() + ".var");
// The below is basically equivalent to AI.replaceAllUsesWith(NewAI), but we
// cannot use it because it requires the old and new types be the same,
// which is not true here because the address spaces are different.
if (AI.hasValueHandle())
ValueHandleBase::ValueIsRAUWd(&AI, NewAI);
if (AI.isUsedByMetadata())
ValueAsMetadata::handleRAUW(&AI, NewAI);
while (!AI.materialized_use_empty()) {
Use &U = *AI.materialized_use_begin();
U.set(NewAI);
}
AI.eraseFromParent();
}
}
bool WebAssemblyRefTypeMem2Local::runOnFunction(Function &F) {
LLVM_DEBUG(dbgs() << "********** WebAssembly RefType Mem2Local **********\n"
"********** Function: "
<< F.getName() << '\n');
if (F.getFnAttribute("target-features")
.getValueAsString()
.contains("+reference-types"))
visit(F);
return Changed;
}
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