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//===- ReduceAttributes.cpp - Specialized Delta Pass ----------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements a function which calls the Generic Delta pass in order
// to reduce uninteresting attributes.
//
//===----------------------------------------------------------------------===//
#include "ReduceAttributes.h"
#include "Delta.h"
#include "TestRunner.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/Sequence.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/IR/Attributes.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/GlobalVariable.h"
#include "llvm/IR/InstVisitor.h"
#include "llvm/IR/InstrTypes.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/IR/Module.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <cassert>
#include <iterator>
#include <utility>
namespace llvm {
class LLVMContext;
} // namespace llvm
using namespace llvm;
namespace {
/// Given ChunksToKeep, produce a map of global variables/functions/calls
/// and indexes of attributes to be preserved for each of them.
class AttributeRemapper : public InstVisitor<AttributeRemapper> {
Oracle &O;
LLVMContext &Context;
public:
AttributeRemapper(Oracle &O, LLVMContext &C) : O(O), Context(C) {}
void visitModule(Module &M) {
for (GlobalVariable &GV : M.globals())
visitGlobalVariable(GV);
}
void visitGlobalVariable(GlobalVariable &GV) {
// Global variables only have one attribute set.
AttributeSet AS = GV.getAttributes();
if (AS.hasAttributes()) {
AttrBuilder AttrsToPreserve(Context);
visitAttributeSet(AS, AttrsToPreserve);
GV.setAttributes(AttributeSet::get(Context, AttrsToPreserve));
}
}
void visitFunction(Function &F) {
// We can neither add nor remove attributes from intrinsics.
if (F.getIntrinsicID() == Intrinsic::not_intrinsic)
F.setAttributes(visitAttributeList(F.getAttributes()));
}
void visitCallBase(CallBase &CB) {
CB.setAttributes(visitAttributeList(CB.getAttributes()));
}
AttributeSet visitAttributeIndex(AttributeList AL, unsigned Index) {
AttrBuilder AttributesToPreserve(Context);
visitAttributeSet(AL.getAttributes(Index), AttributesToPreserve);
if (AttributesToPreserve.attrs().empty())
return {};
return AttributeSet::get(Context, AttributesToPreserve);
}
AttributeList visitAttributeList(AttributeList AL) {
SmallVector<std::pair<unsigned, AttributeSet>> NewAttrList;
NewAttrList.reserve(AL.getNumAttrSets());
for (unsigned SetIdx : AL.indexes()) {
if (SetIdx == AttributeList::FunctionIndex)
continue;
AttributeSet AttrSet = visitAttributeIndex(AL, SetIdx);
if (AttrSet.hasAttributes())
NewAttrList.emplace_back(SetIdx, AttrSet);
}
// FIXME: It's ridiculous that indexes() doesn't give us the correct order
// for contructing a new AttributeList. Special case the function index so
// we don't have to sort.
AttributeSet FnAttrSet =
visitAttributeIndex(AL, AttributeList::FunctionIndex);
if (FnAttrSet.hasAttributes())
NewAttrList.emplace_back(AttributeList::FunctionIndex, FnAttrSet);
return AttributeList::get(Context, NewAttrList);
}
void visitAttributeSet(const AttributeSet &AS, AttrBuilder &AttrsToPreserve) {
// Optnone requires noinline, so removing noinline requires removing the
// pair.
Attribute NoInline = AS.getAttribute(Attribute::NoInline);
bool RemoveNoInline = false;
if (NoInline.isValid()) {
RemoveNoInline = !O.shouldKeep();
if (!RemoveNoInline)
AttrsToPreserve.addAttribute(NoInline);
}
for (Attribute A : AS) {
if (A.isEnumAttribute()) {
Attribute::AttrKind Kind = A.getKindAsEnum();
if (Kind == Attribute::NoInline)
continue;
if (RemoveNoInline && Kind == Attribute::OptimizeNone)
continue;
// TODO: Could only remove this if there are no constrained calls in the
// function.
if (Kind == Attribute::StrictFP) {
AttrsToPreserve.addAttribute(A);
continue;
}
}
if (O.shouldKeep())
AttrsToPreserve.addAttribute(A);
}
}
};
} // namespace
/// Removes out-of-chunk attributes from module.
static void extractAttributesFromModule(Oracle &O, ReducerWorkItem &WorkItem) {
AttributeRemapper R(O, WorkItem.getContext());
R.visit(WorkItem.getModule());
}
void llvm::reduceAttributesDeltaPass(TestRunner &Test) {
runDeltaPass(Test, extractAttributesFromModule, "Reducing Attributes");
}
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