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//===--- LLVMSwiftAA.cpp - LLVM Alias Analysis for Swift ------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
#include "swift/LLVMPasses/Passes.h"
#include "LLVMARCOpts.h"
#include "llvm/Analysis/TargetLibraryInfo.h"
#include "llvm/IR/LegacyPassManager.h"
#include "llvm/IR/Module.h"
using namespace llvm;
using namespace swift;
//===----------------------------------------------------------------------===//
// Alias Analysis Result
//===----------------------------------------------------------------------===//
static ModRefInfo getConservativeModRefForKind(const llvm::Instruction &I) {
switch (classifyInstruction(I)) {
#define KIND(Name, MemBehavior) case RT_ ## Name: return ModRefInfo:: MemBehavior;
#include "LLVMSwift.def"
}
llvm_unreachable("Not a valid Instruction.");
}
ModRefInfo SwiftAAResult::getModRefInfo(const llvm::CallBase *Call,
const llvm::MemoryLocation &Loc,
llvm::AAQueryInfo &AAQI) {
// We know at compile time that certain entry points do not modify any
// compiler-visible state ever. Quickly check if we have one of those
// instructions and return if so.
if (ModRefInfo::NoModRef == getConservativeModRefForKind(*Call))
return ModRefInfo::NoModRef;
// Otherwise, delegate to the rest of the AA ModRefInfo machinery.
return AAResultBase::getModRefInfo(Call, Loc, AAQI);
}
//===----------------------------------------------------------------------===//
// Alias Analysis Wrapper Pass
//===----------------------------------------------------------------------===//
char SwiftAAWrapperPass::ID = 0;
INITIALIZE_PASS_BEGIN(SwiftAAWrapperPass, "swift-aa",
"Swift Alias Analysis", false, true)
INITIALIZE_PASS_DEPENDENCY(TargetLibraryInfoWrapperPass)
INITIALIZE_PASS_END(SwiftAAWrapperPass, "swift-aa",
"Swift Alias Analysis", false, true)
SwiftAAWrapperPass::SwiftAAWrapperPass() : ImmutablePass(ID) {
initializeSwiftAAWrapperPassPass(*PassRegistry::getPassRegistry());
}
bool SwiftAAWrapperPass::doInitialization(Module &M) {
Result.reset(new SwiftAAResult());
return false;
}
bool SwiftAAWrapperPass::doFinalization(Module &M) {
Result.reset();
return false;
}
void SwiftAAWrapperPass::getAnalysisUsage(AnalysisUsage &AU) const {
AU.setPreservesAll();
AU.addRequired<TargetLibraryInfoWrapperPass>();
}
AnalysisKey SwiftAA::Key;
SwiftAAResult SwiftAA::run(llvm::Function &F,
llvm::FunctionAnalysisManager &AM) {
return SwiftAAResult();
}
//===----------------------------------------------------------------------===//
// Top Level Entry Point
//===----------------------------------------------------------------------===//
llvm::ImmutablePass *swift::createSwiftAAWrapperPass() {
return new SwiftAAWrapperPass();
}
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