mirror of
https://github.com/apple/swift.git
synced 2025-12-21 12:14:44 +01:00
d78b376d07
The old invalidation lattice was incorrect because changes to control flow could cause changes to the call graph, so we've decided to change the way passes invalidate analysis. In the new scheme, the lattice is replaced with a list of traits that passes preserve or invalidate. The current traits are Calls and Branches. Now, passes report which traits they preserve, which is the opposite of the previous implementation where passes needed to report what they invalidate. Node: I tried to limit the changes in this commit to mechanical changes to ease the review. I will cleanup some of the code in a following commit. Swift SVN r26449
118 lines
3.2 KiB
C++
118 lines
3.2 KiB
C++
//===------------------- IVAnalysis.h - SIL IV Analysis -------*- C++ -*---===//
|
|
//
|
|
// This source file is part of the Swift.org open source project
|
|
//
|
|
// Copyright (c) 2014 - 2015 Apple Inc. and the Swift project authors
|
|
// Licensed under Apache License v2.0 with Runtime Library Exception
|
|
//
|
|
// See http://swift.org/LICENSE.txt for license information
|
|
// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef SWIFT_SILANALYSIS_IVANALYSIS_H
|
|
#define SWIFT_SILANALYSIS_IVANALYSIS_H
|
|
|
|
#include "swift/SILAnalysis/Analysis.h"
|
|
#include "swift/SIL/SILArgument.h"
|
|
#include "swift/SIL/SILValue.h"
|
|
#include "swift/SILPasses/Utils/SCCVisitor.h"
|
|
#include "llvm/ADT/DenseMap.h"
|
|
#include "llvm/ADT/SmallVector.h"
|
|
#include "llvm/Support/Debug.h"
|
|
|
|
namespace swift {
|
|
|
|
class IVInfo : public SCCVisitor<IVInfo> {
|
|
public:
|
|
typedef llvm::SmallVectorImpl<ValueBase *> SCCType;
|
|
friend class SCCVisitor;
|
|
|
|
public:
|
|
|
|
/// A descriptor for an induction variable comprised of an header argument
|
|
/// (phi node) and an increment by an integer literal.
|
|
class IVDesc {
|
|
public:
|
|
BuiltinInst *Inc;
|
|
IntegerLiteralInst *IncVal;
|
|
|
|
IVDesc() : Inc(nullptr), IncVal(nullptr) {}
|
|
IVDesc(BuiltinInst *AI, IntegerLiteralInst *I) : Inc(AI), IncVal(I) {}
|
|
|
|
operator bool() { return Inc != nullptr && IncVal != nullptr; }
|
|
static IVDesc invalidIV() { return IVDesc(); }
|
|
};
|
|
|
|
IVInfo(SILFunction &F) : SCCVisitor(F) {
|
|
run();
|
|
}
|
|
|
|
bool isInductionVariable(ValueBase *IV) {
|
|
auto End = InductionVariableMap.end();
|
|
auto Found = InductionVariableMap.find(IV);
|
|
return Found != End;
|
|
}
|
|
|
|
SILArgument *getInductionVariableHeader(ValueBase *IV) {
|
|
assert(isInductionVariable(IV) && "Expected induction variable!");
|
|
|
|
return InductionVariableMap.find(IV)->second;
|
|
}
|
|
|
|
IVDesc getInductionDesc(SILArgument *Arg) {
|
|
llvm::DenseMap<const ValueBase *, IVDesc>::iterator CI =
|
|
InductionInfoMap.find(Arg);
|
|
if (CI == InductionInfoMap.end())
|
|
return IVDesc::invalidIV();
|
|
return CI->second;
|
|
}
|
|
|
|
private:
|
|
// Map from an element of an induction sequence to the header.
|
|
llvm::DenseMap<const ValueBase *, SILArgument *> InductionVariableMap;
|
|
|
|
// Map from an induction variable header to the induction descriptor.
|
|
llvm::DenseMap<const ValueBase *, IVDesc> InductionInfoMap;
|
|
|
|
SILArgument *isInductionSequence(SCCType &SCC);
|
|
void visit(SCCType &SCC);
|
|
};
|
|
|
|
class IVAnalysis : public SILAnalysis {
|
|
public:
|
|
IVAnalysis(SILModule *) : SILAnalysis(AnalysisKind::IVAnalysis) {}
|
|
~IVAnalysis();
|
|
|
|
static bool classof(const SILAnalysis *S) {
|
|
return S->getKind() == AnalysisKind::IVAnalysis;
|
|
}
|
|
|
|
IVInfo &getIVInfo(SILFunction *F) {
|
|
if (!IVInfos.count(F))
|
|
IVInfos[F] = new IVInfo(*F);
|
|
return *IVInfos[F];
|
|
}
|
|
|
|
virtual void invalidate(SILAnalysis::PreserveKind K) {
|
|
for (auto IVI : IVInfos)
|
|
delete IVI.second;
|
|
|
|
IVInfos.clear();
|
|
}
|
|
|
|
virtual void invalidate(SILFunction *F, SILAnalysis::PreserveKind K) {
|
|
if (IVInfos.count(F)) {
|
|
delete IVInfos[F];
|
|
IVInfos.erase(F);
|
|
}
|
|
}
|
|
|
|
private:
|
|
llvm::DenseMap<SILFunction *, IVInfo *> IVInfos;
|
|
};
|
|
|
|
}
|
|
|
|
#endif
|