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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/DenseMap.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/Sequence.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/iterator_range.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>
#include <vector>
namespace llvm {
class LLVMContext;
} // namespace llvm
using namespace llvm;
namespace {
using AttrPtrVecTy = std::vector<const Attribute *>;
using AttrPtrIdxVecVecTy = std::pair<unsigned, AttrPtrVecTy>;
using AttrPtrVecVecTy = SmallVector<AttrPtrIdxVecVecTy, 3>;
/// 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;
public:
DenseMap<GlobalVariable *, AttrPtrVecTy> GlobalVariablesToRefine;
DenseMap<Function *, AttrPtrVecVecTy> FunctionsToRefine;
DenseMap<CallBase *, AttrPtrVecVecTy> CallsToRefine;
explicit AttributeRemapper(ArrayRef<Chunk> ChunksToKeep) : O(ChunksToKeep) {}
void visitModule(Module &M) {
for (GlobalVariable &GV : M.getGlobalList())
visitGlobalVariable(GV);
}
void visitGlobalVariable(GlobalVariable &GV) {
// Global variables only have one attribute set.
const AttributeSet &AS = GV.getAttributes();
if (AS.hasAttributes())
visitAttributeSet(AS, GlobalVariablesToRefine[&GV]);
}
void visitFunction(Function &F) {
if (F.getIntrinsicID() != Intrinsic::not_intrinsic)
return; // We can neither add nor remove attributes from intrinsics.
visitAttributeList(F.getAttributes(), FunctionsToRefine[&F]);
}
void visitCallBase(CallBase &I) {
visitAttributeList(I.getAttributes(), CallsToRefine[&I]);
}
void visitAttributeList(const AttributeList &AL,
AttrPtrVecVecTy &AttributeSetsToPreserve) {
assert(AttributeSetsToPreserve.empty() && "Should not be sharing vectors.");
AttributeSetsToPreserve.reserve(AL.getNumAttrSets());
for (unsigned SetIdx : seq(AL.index_begin(), AL.index_end())) {
AttrPtrIdxVecVecTy AttributesToPreserve;
AttributesToPreserve.first = SetIdx;
visitAttributeSet(AL.getAttributes(AttributesToPreserve.first),
AttributesToPreserve.second);
if (!AttributesToPreserve.second.empty())
AttributeSetsToPreserve.emplace_back(std::move(AttributesToPreserve));
}
}
void visitAttributeSet(const AttributeSet &AS,
AttrPtrVecTy &AttrsToPreserve) {
assert(AttrsToPreserve.empty() && "Should not be sharing vectors.");
AttrsToPreserve.reserve(AS.getNumAttributes());
for (const Attribute &A : AS)
if (O.shouldKeep())
AttrsToPreserve.emplace_back(&A);
}
};
struct AttributeCounter : public InstVisitor<AttributeCounter> {
/// How many features (in this case, attributes) did we count, total?
int AttributeCount = 0;
void visitModule(Module &M) {
for (GlobalVariable &GV : M.getGlobalList())
visitGlobalVariable(GV);
}
void visitGlobalVariable(GlobalVariable &GV) {
// Global variables only have one attribute set.
visitAttributeSet(GV.getAttributes());
}
void visitFunction(Function &F) {
if (F.getIntrinsicID() != Intrinsic::not_intrinsic)
return; // We can neither add nor remove attributes from intrinsics.
visitAttributeList(F.getAttributes());
}
void visitCallBase(CallBase &I) { visitAttributeList(I.getAttributes()); }
void visitAttributeList(const AttributeList &AL) {
for (const AttributeSet &AS : AL)
visitAttributeSet(AS);
}
void visitAttributeSet(const AttributeSet &AS) {
AttributeCount += AS.getNumAttributes();
}
};
} // namespace
AttributeSet
convertAttributeRefToAttributeSet(LLVMContext &C,
ArrayRef<const Attribute *> Attributes) {
AttrBuilder B;
for (const Attribute *A : Attributes)
B.addAttribute(*A);
return AttributeSet::get(C, B);
}
AttributeList convertAttributeRefVecToAttributeList(
LLVMContext &C, ArrayRef<AttrPtrIdxVecVecTy> AttributeSets) {
std::vector<std::pair<unsigned, AttributeSet>> SetVec;
SetVec.reserve(AttributeSets.size());
transform(AttributeSets, std::back_inserter(SetVec),
[&C](const AttrPtrIdxVecVecTy &V) {
return std::make_pair(
V.first, convertAttributeRefToAttributeSet(C, V.second));
});
sort(SetVec, [](const std::pair<unsigned, AttributeSet> &LHS,
const std::pair<unsigned, AttributeSet> &RHS) {
return LHS.first < RHS.first; // All values are unique.
});
return AttributeList::get(C, SetVec);
}
/// Removes out-of-chunk attributes from module.
static void extractAttributesFromModule(std::vector<Chunk> ChunksToKeep,
Module *Program) {
AttributeRemapper R(ChunksToKeep);
R.visit(Program);
LLVMContext &C = Program->getContext();
for (const auto &I : R.GlobalVariablesToRefine)
I.first->setAttributes(convertAttributeRefToAttributeSet(C, I.second));
for (const auto &I : R.FunctionsToRefine)
I.first->setAttributes(convertAttributeRefVecToAttributeList(C, I.second));
for (const auto &I : R.CallsToRefine)
I.first->setAttributes(convertAttributeRefVecToAttributeList(C, I.second));
}
/// Counts the amount of attributes.
static int countAttributes(Module *Program) {
AttributeCounter C;
// TODO: Silence index with --quiet flag
outs() << "----------------------------\n";
C.visit(Program);
outs() << "Number of attributes: " << C.AttributeCount << "\n";
return C.AttributeCount;
}
void llvm::reduceAttributesDeltaPass(TestRunner &Test) {
outs() << "*** Reducing Attributes...\n";
int AttributeCount = countAttributes(Test.getProgram());
runDeltaPass(Test, AttributeCount, extractAttributesFromModule);
}
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