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d2fc6eb3b5
Instead of caching alias results globally for the module, make AliasAnalysis a FunctionAnalysisBase which caches the alias results per function.
Why?
* So far the result caches could only grow. They were reset when they reached a certain size. This was not ideal. Now, they are invalidated whenever the function changes.
* It was not possible to actually invalidate an alias analysis result. This is required, for example in TempRValueOpt and TempLValueOpt (so far it was done manually with invalidateInstruction).
* Type based alias analysis results were also cached for the whole module, while it is actually dependent on the function, because it depends on the function's resilience expansion. This was a potential bug.
I also added a new PassManager API to directly get a function-base analysis:
getAnalysis(SILFunction *f)
The second change of this commit is the removal of the instruction-index indirection for the cache keys. Now the cache keys directly work on instruction pointers instead of instruction indices. This reduces the number of hash table lookups for a cache lookup from 3 to 1.
This indirection was needed to avoid dangling instruction pointers in the cache keys. But this is not needed anymore, because of the new delayed instruction deletion mechanism.
78 lines
2.7 KiB
C++
78 lines
2.7 KiB
C++
//===--- EpilogueRetainReleaseMatcherDumper.cpp - Find Epilogue Releases --===//
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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 - 2017 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 https://swift.org/LICENSE.txt for license information
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// See https://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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/// \file
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/// This pass finds the epilogue releases matched to each argument of the
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/// function.
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///
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "sil-epilogue-release-dumper"
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#include "swift/SILOptimizer/PassManager/Passes.h"
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#include "swift/SIL/SILArgument.h"
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#include "swift/SIL/SILFunction.h"
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#include "swift/SIL/SILValue.h"
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#include "swift/SILOptimizer/Analysis/AliasAnalysis.h"
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#include "swift/SILOptimizer/Analysis/ARCAnalysis.h"
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#include "swift/SILOptimizer/Analysis/Analysis.h"
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#include "swift/SILOptimizer/Analysis/RCIdentityAnalysis.h"
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#include "swift/SILOptimizer/PassManager/Transforms.h"
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using namespace swift;
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//===----------------------------------------------------------------------===//
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// Top Level Driver
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//===----------------------------------------------------------------------===//
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namespace {
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/// Find and dump the epilogue release instructions for the arguments.
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class SILEpilogueRetainReleaseMatcherDumper : public SILModuleTransform {
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void run() override {
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auto *RCIA = getAnalysis<RCIdentityAnalysis>();
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for (auto &Fn: *getModule()) {
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// Function is not definition.
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if (!Fn.isDefinition())
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continue;
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auto *AA = PM->getAnalysis<AliasAnalysis>(&Fn);
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llvm::outs() << "START: sil @" << Fn.getName() << "\n";
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// Handle @owned return value.
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ConsumedResultToEpilogueRetainMatcher RetMap(RCIA->get(&Fn), AA, &Fn);
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for (auto &RI : RetMap)
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llvm::outs() << *RI;
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// Handle @owned function arguments.
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ConsumedArgToEpilogueReleaseMatcher RelMap(RCIA->get(&Fn), &Fn);
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// Iterate over arguments and dump their epilogue releases.
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for (auto Arg : Fn.getArguments()) {
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llvm::outs() << *Arg;
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// Can not find an epilogue release instruction for the argument.
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for (auto &RI : RelMap.getReleasesForArgument(Arg))
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llvm::outs() << *RI;
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}
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llvm::outs() << "END: sil @" << Fn.getName() << "\n";
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}
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}
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};
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} // end anonymous namespace
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SILTransform *swift::createEpilogueRetainReleaseMatcherDumper() {
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return new SILEpilogueRetainReleaseMatcherDumper();
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}
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