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f9b524b1cb
The main changes are: *) Rewrite everything in swift. So far, parts of memory-behavior analysis were already implemented in swift. Now everything is done in swift and lives in `AliasAnalysis.swift`. This is a big code simplification. *) Support many more instructions in the memory-behavior analysis - especially OSSA instructions, like `begin_borrow`, `end_borrow`, `store_borrow`, `load_borrow`. The computation of end_borrow effects is now much more precise. Also, partial_apply is now handled more precisely. *) Simplify and reduce type-based alias analysis (TBAA). The complexity of the old TBAA comes from old days where the language and SIL didn't have strict aliasing and exclusivity rules (e.g. for inout arguments). Now TBAA is only needed for code using unsafe pointers. The new TBAA handles this - and not more. Note that TBAA for classes is already done in `AccessBase.isDistinct`. *) Handle aliasing in `begin_access [modify]` scopes. We already supported truly immutable scopes like `begin_access [read]` or `ref_element_addr [immutable]`. For `begin_access [modify]` we know that there are no other reads or writes to the access-address within the scope. *) Don't cache memory-behavior results. It turned out that the hit-miss rate was pretty bad (~ 1:7). The overhead of the cache lookup took as long as recomputing the memory behavior.
108 lines
3.8 KiB
C++
108 lines
3.8 KiB
C++
//===--- BasicCalleeAnalysis.cpp - Determine callees per call site --------===//
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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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#include "swift/SILOptimizer/Analysis/BasicCalleeAnalysis.h"
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#include "swift/AST/Decl.h"
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#include "swift/AST/ProtocolConformance.h"
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#include "swift/Basic/Statistic.h"
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#include "swift/SIL/MemAccessUtils.h"
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#include "swift/SIL/SILBridging.h"
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#include "swift/SIL/SILModule.h"
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#include "swift/SIL/Test.h"
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#include "swift/SILOptimizer/OptimizerBridging.h"
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#include "swift/SILOptimizer/PassManager/Transforms.h"
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#include "swift/SILOptimizer/Utils/InstOptUtils.h"
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#include "llvm/Support/Compiler.h"
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#include <algorithm>
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#define DEBUG_TYPE "BasicCalleeAnalysis"
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using namespace swift;
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// TODO: can't be inlined to work around https://github.com/apple/swift/issues/64502
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BasicCalleeAnalysis::~BasicCalleeAnalysis() {
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}
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void BasicCalleeAnalysis::dump() const {
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print(llvm::errs());
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}
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void BasicCalleeAnalysis::print(llvm::raw_ostream &os) const {
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if (!Cache) {
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os << "<no cache>\n";
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}
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llvm::DenseSet<SILDeclRef> printed;
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for (auto &VTable : M.getVTables()) {
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for (const SILVTable::Entry &entry : VTable->getEntries()) {
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if (printed.insert(entry.getMethod()).second) {
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os << "callees for " << entry.getMethod() << ":\n";
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Cache->getCalleeList(entry.getMethod()).print(os);
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}
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}
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}
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}
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//===----------------------------------------------------------------------===//
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// Swift Bridging
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//===----------------------------------------------------------------------===//
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static BridgedCalleeAnalysis::IsDeinitBarrierFn instructionIsDeinitBarrierFunction;
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static BridgedCalleeAnalysis::GetMemBehvaiorFn getMemBehvaiorFunction = nullptr;
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void BridgedCalleeAnalysis::registerAnalysis(IsDeinitBarrierFn instructionIsDeinitBarrierFn,
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GetMemBehvaiorFn getMemBehvaiorFn) {
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instructionIsDeinitBarrierFunction = instructionIsDeinitBarrierFn;
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getMemBehvaiorFunction = getMemBehvaiorFn;
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}
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MemoryBehavior BasicCalleeAnalysis::
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getMemoryBehavior(FullApplySite as, bool observeRetains) {
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if (getMemBehvaiorFunction) {
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auto b = getMemBehvaiorFunction({as.getInstruction()->asSILNode()},
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observeRetains,
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{this});
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return (MemoryBehavior)b;
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}
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return MemoryBehavior::MayHaveSideEffects;
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}
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bool swift::isDeinitBarrier(SILInstruction *const instruction,
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BasicCalleeAnalysis *bca) {
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if (!instructionIsDeinitBarrierFunction) {
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return mayBeDeinitBarrierNotConsideringSideEffects(instruction);
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}
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BridgedInstruction inst = {
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cast<SILNode>(const_cast<SILInstruction *>(instruction))};
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BridgedCalleeAnalysis analysis = {bca};
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return instructionIsDeinitBarrierFunction(inst, analysis);
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}
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namespace swift::test {
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// Arguments:
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// - instruction
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// Dumps:
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// - instruction
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// - whether it's a deinit barrier
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static FunctionTest IsDeinitBarrierTest("is_deinit_barrier", [](auto &function,
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auto &arguments,
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auto &test) {
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auto *instruction = arguments.takeInstruction();
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auto *analysis = test.template getAnalysis<BasicCalleeAnalysis>();
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auto isBarrier = isDeinitBarrier(instruction, analysis);
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instruction->print(llvm::outs());
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auto *boolString = isBarrier ? "true" : "false";
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llvm::outs() << boolString << "\n";
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});
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} // namespace swift::test
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