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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 "llvm/IR/GlobalValue.h"
using namespace llvm;
/// Removes all the bodies of defined functions that aren't inside any of the
/// desired Chunks.
static void
extractFunctionBodiesFromModule(const std::vector<Chunk> &ChunksToKeep,
Module *Program) {
Oracle O(ChunksToKeep);
// Delete out-of-chunk function bodies
std::vector<Function *> FuncDefsToReduce;
for (auto &F : *Program)
if (!F.isDeclaration() && !O.shouldKeep()) {
F.deleteBody();
F.setComdat(nullptr);
}
}
/// Counts the amount of non-declaration functions and prints their
/// respective name & index
static int countFunctionDefinitions(Module *Program) {
// TODO: Silence index with --quiet flag
errs() << "----------------------------\n";
errs() << "Function Definition Index Reference:\n";
int FunctionDefinitionCount = 0;
for (auto &F : *Program)
if (!F.isDeclaration())
errs() << "\t" << ++FunctionDefinitionCount << ": " << F.getName()
<< "\n";
errs() << "----------------------------\n";
return FunctionDefinitionCount;
}
void llvm::reduceFunctionBodiesDeltaPass(TestRunner &Test) {
errs() << "*** Reducing Function Bodies...\n";
int Functions = countFunctionDefinitions(Test.getProgram());
runDeltaPass(Test, Functions, extractFunctionBodiesFromModule);
errs() << "----------------------------\n";
}
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