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//===- ReduceFunctions.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 function bodies in the provided Module.
//
//===----------------------------------------------------------------------===//
#include "ReduceFunctionBodies.h"
#include "Delta.h"
#include "Utils.h"
#include "llvm/IR/GlobalValue.h"
#include "llvm/IR/Instructions.h"
using namespace llvm;
/// Removes all the bodies of defined functions that aren't inside any of the
/// desired Chunks.
static void extractFunctionBodiesFromModule(Oracle &O,
ReducerWorkItem &WorkItem) {
// Delete out-of-chunk function bodies
for (auto &F : WorkItem.getModule()) {
if (!F.isDeclaration() && !hasAliasUse(F) && !O.shouldKeep()) {
F.deleteBody();
F.setComdat(nullptr);
}
}
}
void llvm::reduceFunctionBodiesDeltaPass(TestRunner &Test) {
runDeltaPass(Test, extractFunctionBodiesFromModule,
"Reducing Function Bodies");
}
static void reduceFunctionData(Oracle &O, ReducerWorkItem &WorkItem) {
for (Function &F : WorkItem.getModule()) {
if (F.hasPersonalityFn()) {
if (none_of(F,
[](const BasicBlock &BB) {
return BB.isEHPad() || isa<ResumeInst>(BB.getTerminator());
}) &&
!O.shouldKeep()) {
F.setPersonalityFn(nullptr);
}
}
if (F.hasPrefixData() && !O.shouldKeep())
F.setPrefixData(nullptr);
if (F.hasPrologueData() && !O.shouldKeep())
F.setPrologueData(nullptr);
}
}
void llvm::reduceFunctionDataDeltaPass(TestRunner &Test) {
runDeltaPass(Test, reduceFunctionData, "Reducing Function Data");
}
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