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1339b5403b
Correct format: //===--- Name of file - Description ----------------------------*- Lang -*-===//
100 lines
3.1 KiB
C++
100 lines
3.1 KiB
C++
//===--- Devirtualizer.cpp - Devirtualize indirect calls -----------------===//
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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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//
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// Devirtualize indirect calls to functions, turning them into direct function
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// references.
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "sil-devirtualizer"
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#include "swift/SIL/SILFunction.h"
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#include "swift/SIL/SILInstruction.h"
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#include "swift/SILOptimizer/Analysis/ClassHierarchyAnalysis.h"
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#include "swift/SILOptimizer/Utils/Devirtualize.h"
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#include "swift/SILOptimizer/PassManager/Transforms.h"
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#include "llvm/ADT/SmallVector.h"
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using namespace swift;
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namespace {
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class Devirtualizer : public SILFunctionTransform {
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bool devirtualizeAppliesInFunction(SILFunction &F,
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ClassHierarchyAnalysis *CHA);
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/// The entry point to the transformation.
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void run() override {
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SILFunction &F = *getFunction();
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ClassHierarchyAnalysis *CHA = PM->getAnalysis<ClassHierarchyAnalysis>();
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DEBUG(llvm::dbgs() << "***** Devirtualizer on function:" << F.getName()
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<< " *****\n");
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if (devirtualizeAppliesInFunction(F, CHA))
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invalidateAnalysis(SILAnalysis::InvalidationKind::CallsAndInstructions);
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}
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StringRef getName() override { return "Devirtualizer"; }
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};
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} // end anonymous namespace
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bool Devirtualizer::devirtualizeAppliesInFunction(SILFunction &F,
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ClassHierarchyAnalysis *CHA) {
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bool Changed = false;
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llvm::SmallVector<SILInstruction *, 8> DeadApplies;
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for (auto &BB : F) {
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for (auto It = BB.begin(), End = BB.end(); It != End;) {
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auto &I = *It++;
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// Skip non-apply instructions.
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auto Apply = FullApplySite::isa(&I);
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if (!Apply)
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continue;
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auto NewInstPair = tryDevirtualizeApply(Apply, CHA);
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if (!NewInstPair.second)
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continue;
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Changed = true;
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auto *CalleeFn = NewInstPair.second.getCalleeFunction();
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assert(CalleeFn && "Expected devirtualized callee!");
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// We may not have optimized these functions yet, and it could
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// be beneficial to rerun some earlier passes on the current
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// function now that we've made these direct references visible.
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if (CalleeFn->isDefinition() && CalleeFn->shouldOptimize())
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notifyPassManagerOfFunction(CalleeFn);
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auto *AI = Apply.getInstruction();
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if (!isa<TryApplyInst>(AI))
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AI->replaceAllUsesWith(NewInstPair.first);
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DeadApplies.push_back(AI);
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}
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}
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// Remove all the now-dead applies.
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while (!DeadApplies.empty()) {
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auto *AI = DeadApplies.pop_back_val();
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recursivelyDeleteTriviallyDeadInstructions(AI, true);
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}
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return Changed;
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}
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SILTransform *swift::createDevirtualizer() { return new Devirtualizer(); }
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