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//===--- DebugUtils.cpp ---------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2018 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
#include "swift/SIL/DebugUtils.h"
#include "swift/Basic/STLExtras.h"
#include "swift/SIL/SILArgument.h"
#include "swift/SIL/SILInstruction.h"
#include "llvm/ADT/PointerIntPair.h"
#include "llvm/ADT/SmallPtrSet.h"
using namespace swift;
bool swift::hasNonTrivialNonDebugTransitiveUsers(
PointerUnion<SILInstruction *, SILArgument *> V) {
llvm::SmallVector<SILInstruction *, 8> Worklist;
llvm::SmallPtrSet<SILInstruction *, 8> SeenInsts;
// Initialize our worklist.
if (auto *A = V.dyn_cast<SILArgument *>()) {
for (Operand *Op : getNonDebugUses(SILValue(A))) {
auto *User = Op->getUser();
if (!SeenInsts.insert(User).second)
continue;
Worklist.push_back(User);
}
} else {
auto *I = V.get<SILInstruction *>();
SeenInsts.insert(I);
Worklist.push_back(I);
}
while (!Worklist.empty()) {
SILInstruction *U = Worklist.pop_back_val();
assert(SeenInsts.count(U) &&
"Worklist should only contain seen instructions?!");
// If U is a terminator inst, return false.
if (isa<TermInst>(U))
return true;
// If U has side effects...
if (U->mayHaveSideEffects())
return true;
// Otherwise add all non-debug uses of I that we have not seen yet to the
// worklist.
for (SILValue Result : U->getResults()) {
for (Operand *I : getNonDebugUses(Result)) {
auto *User = I->getUser();
if (!SeenInsts.insert(User).second)
continue;
Worklist.push_back(User);
}
}
}
return false;
}
DebugVarCarryingInst DebugVarCarryingInst::getFromValue(SILValue value) {
if (auto *svi = dyn_cast<SingleValueInstruction>(value)) {
if (auto result = VarDeclCarryingInst(svi)) {
switch (result.getKind()) {
case VarDeclCarryingInst::Kind::Invalid:
llvm_unreachable("ShouldKind have never seen this");
case VarDeclCarryingInst::Kind::DebugValue:
case VarDeclCarryingInst::Kind::AllocStack:
case VarDeclCarryingInst::Kind::AllocBox:
return DebugVarCarryingInst(svi);
case VarDeclCarryingInst::Kind::GlobalAddr:
case VarDeclCarryingInst::Kind::RefElementAddr:
return DebugVarCarryingInst();
}
}
}
if (auto *use = getSingleDebugUse(value))
return DebugVarCarryingInst(use->getUser());
return DebugVarCarryingInst();
}
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