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introduce a common superclass, SILNode. This is in preparation for allowing instructions to have multiple results. It is also a somewhat more elegant representation for instructions that have zero results. Instructions that are known to have exactly one result inherit from a class, SingleValueInstruction, that subclasses both ValueBase and SILInstruction. Some care must be taken when working with SILNode pointers and testing for equality; please see the comment on SILNode for more information. A number of SIL passes needed to be updated in order to handle this new distinction between SIL values and SIL instructions. Note that the SIL parser is now stricter about not trying to assign a result value from an instruction (like 'return' or 'strong_retain') that does not produce any.
103 lines
3.4 KiB
C++
103 lines
3.4 KiB
C++
//===--- MemBehaviorDumper.cpp --------------------------------------------===//
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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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#define DEBUG_TYPE "sil-mem-behavior-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/SideEffectAnalysis.h"
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#include "swift/SILOptimizer/Analysis/Analysis.h"
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#include "swift/SILOptimizer/PassManager/Transforms.h"
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#include "llvm/Support/Debug.h"
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using namespace swift;
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//===----------------------------------------------------------------------===//
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// Value Gatherer
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//===----------------------------------------------------------------------===//
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// Return a list of all instruction values in Fn. Returns true if we have at
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// least two values to compare.
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static bool gatherValues(SILFunction &Fn, std::vector<SILValue> &Values) {
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for (auto &BB : Fn) {
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for (auto *Arg : BB.getArguments())
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Values.push_back(SILValue(Arg));
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for (auto &II : BB) {
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for (auto result : II.getResults())
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Values.push_back(result);
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}
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}
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return Values.size() > 1;
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}
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//===----------------------------------------------------------------------===//
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// Top Level Driver
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//===----------------------------------------------------------------------===//
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namespace {
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/// Dumps the memory behavior of instructions in a function.
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class MemBehaviorDumper : public SILModuleTransform {
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// To reduce the amount of output, we only dump the memory behavior of
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// selected types of instructions.
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static bool shouldTestInstruction(SILInstruction *I) {
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// Only consider function calls.
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if (FullApplySite::isa(I))
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return true;
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return false;
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}
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void run() override {
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for (auto &Fn : *getModule()) {
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llvm::outs() << "@" << Fn.getName() << "\n";
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// Gather up all Values in Fn.
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std::vector<SILValue> Values;
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if (!gatherValues(Fn, Values))
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continue;
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AliasAnalysis *AA = PM->getAnalysis<AliasAnalysis>();
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unsigned PairCount = 0;
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for (auto &BB : Fn) {
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for (auto &I : BB) {
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if (shouldTestInstruction(&I)) {
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// Print the memory behavior in relation to all other values in the
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// function.
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for (auto &V : Values) {
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bool Read = AA->mayReadFromMemory(&I, V);
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bool Write = AA->mayWriteToMemory(&I, V);
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bool SideEffects = AA->mayHaveSideEffects(&I, V);
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llvm::outs() << "PAIR #" << PairCount++ << ".\n"
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<< " " << I << " " << V
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<< " r=" << Read << ",w=" << Write
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<< ",se=" << SideEffects << "\n";
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}
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}
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}
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}
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llvm::outs() << "\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::createMemBehaviorDumper() {
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return new MemBehaviorDumper();
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}
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