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84473f242a
Do not specialize an apply/partial_apply that we've already added to the set of dead instructions. Doing so can result in creating a new instruction which we will leave around, and which will have a type mismatch in its parameter list. Fixes rdar://problem/25447450.
112 lines
3.8 KiB
C++
112 lines
3.8 KiB
C++
//===--- GenericSpecializer.cpp - Specialization of generic functions -----===//
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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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// Specialize calls to generic functions by substituting static type
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// information.
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "sil-generic-specializer"
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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/Utils/Generics.h"
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#include "swift/SILOptimizer/Utils/Local.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 GenericSpecializer : public SILFunctionTransform {
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bool specializeAppliesInFunction(SILFunction &F);
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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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DEBUG(llvm::dbgs() << "***** GenericSpecializer on function:" << F.getName()
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<< " *****\n");
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if (specializeAppliesInFunction(F))
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invalidateAnalysis(SILAnalysis::InvalidationKind::Everything);
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}
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StringRef getName() override { return "Generic Specializer"; }
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};
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} // end anonymous namespace
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bool GenericSpecializer::specializeAppliesInFunction(SILFunction &F) {
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DeadInstructionSet 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, apply instructions with no
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// substitutions, apply instructions where we do not statically
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// know the called function, and apply instructions where we do
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// not have the body of the called function.
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ApplySite Apply = ApplySite::isa(&I);
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if (!Apply || !Apply.hasSubstitutions())
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continue;
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auto *Callee = Apply.getReferencedFunction();
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if (!Callee || !Callee->isDefinition())
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continue;
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// Do not attempt to specialize known dead instructions. Doing
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// so would be a waste of time (since they are unused), and can
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// also lead to verification errors on the newly created
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// apply. This can happen in the case of a partial application
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// of a reabstraction thunk where we have done an RAUW on the
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// reabstracted function (which is an argument of the partial
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// apply). In this case we add the partial apply of the
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// reabstraction thunk to the set of dead applies, but its
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// arguments types do not match the expected types of the
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// argument that has been RAUWed into it.
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if (DeadApplies.count(Apply.getInstruction()))
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continue;
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// We have a call that can potentially be specialized, so
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// attempt to do so.
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llvm::SmallVector<SILFunction *, 2> NewFunctions;
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trySpecializeApplyOfGeneric(Apply, DeadApplies, NewFunctions);
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// If calling the specialization utility resulted in new functions
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// (as opposed to returning a previous specialization), we need to notify
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// the pass manager so that the new functions get optimized.
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for (SILFunction *NewF : reverse(NewFunctions)) {
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notifyPassManagerOfFunction(NewF);
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}
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}
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}
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// Remove all the now-dead applies.
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bool Changed = false;
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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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Changed = true;
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}
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return Changed;
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}
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SILTransform *swift::createGenericSpecializer() {
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return new GenericSpecializer();
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}
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