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97 lines
3.2 KiB
C++
97 lines
3.2 KiB
C++
//===--- LLVMSwiftAA.cpp - LLVM Alias Analysis for Swift ------------------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2016 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See http://swift.org/LICENSE.txt for license information
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// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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#include "swift/LLVMPasses/Passes.h"
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#include "LLVMARCOpts.h"
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#include "llvm/Analysis/TargetLibraryInfo.h"
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#include "llvm/IR/LegacyPassManager.h"
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#include "llvm/IR/Module.h"
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using namespace llvm;
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using swift::SwiftAAResult;
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using swift::SwiftAAWrapperPass;
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//===----------------------------------------------------------------------===//
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// Alias Analysis Result
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//===----------------------------------------------------------------------===//
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llvm::ModRefInfo SwiftAAResult::getModRefInfo(llvm::ImmutableCallSite CS,
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const llvm::MemoryLocation &Loc) {
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// We know the mod-ref behavior of various runtime functions.
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switch (classifyInstruction(*CS.getInstruction())) {
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case RT_AllocObject:
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case RT_NoMemoryAccessed:
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case RT_Retain:
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case RT_RetainUnowned:
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case RT_CheckUnowned:
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case RT_ObjCRetain:
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case RT_BridgeRetain:
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case RT_UnknownRetain:
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case RT_RetainN:
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case RT_UnknownRetainN:
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case RT_BridgeRetainN:
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case RT_FixLifetime:
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// These entrypoints don't modify any compiler-visible state.
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return MRI_NoModRef;
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case RT_ReleaseN:
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case RT_UnknownReleaseN:
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case RT_BridgeReleaseN:
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case RT_Release:
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case RT_ObjCRelease:
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case RT_BridgeRelease:
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case RT_UnknownRelease:
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case RT_Unknown:
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break;
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}
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return AAResultBase::getModRefInfo(CS, Loc);
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}
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//===----------------------------------------------------------------------===//
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// Alias Analysis Wrapper Pass
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//===----------------------------------------------------------------------===//
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char SwiftAAWrapperPass::ID = 0;
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INITIALIZE_PASS_BEGIN(SwiftAAWrapperPass, "swift-aa",
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"Swift Alias Analysis", false, true)
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INITIALIZE_PASS_DEPENDENCY(TargetLibraryInfoWrapperPass)
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INITIALIZE_PASS_END(SwiftAAWrapperPass, "swift-aa",
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"Swift Alias Analysis", false, true)
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SwiftAAWrapperPass::SwiftAAWrapperPass() : ImmutablePass(ID) {
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initializeSwiftAAWrapperPassPass(*PassRegistry::getPassRegistry());
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}
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bool SwiftAAWrapperPass::doInitialization(Module &M) {
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Result.reset(new SwiftAAResult(
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getAnalysis<TargetLibraryInfoWrapperPass>().getTLI()));
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return false;
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}
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bool SwiftAAWrapperPass::doFinalization(Module &M) {
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Result.reset();
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return false;
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}
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void SwiftAAWrapperPass::getAnalysisUsage(AnalysisUsage &AU) const {
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AU.setPreservesAll();
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AU.addRequired<TargetLibraryInfoWrapperPass>();
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}
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//===----------------------------------------------------------------------===//
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// Top Level Entry Point
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//===----------------------------------------------------------------------===//
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llvm::ImmutablePass *swift::createSwiftAAWrapperPass() {
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return new SwiftAAWrapperPass();
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}
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