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78 lines
2.6 KiB
C++
78 lines
2.6 KiB
C++
//===- ReduceFunctions.cpp - Specialized Delta Pass -----------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements a function which calls the Generic Delta pass in order
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// to reduce functions (and any instruction that calls it) in the provided
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// Module.
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//
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//===----------------------------------------------------------------------===//
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#include "ReduceFunctions.h"
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#include "Delta.h"
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#include "llvm/ADT/SetVector.h"
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#include <set>
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using namespace llvm;
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/// Removes all the Defined Functions (as well as their calls)
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/// that aren't inside any of the desired Chunks.
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static void extractFunctionsFromModule(const std::vector<Chunk> &ChunksToKeep,
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Module *Program) {
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// Get functions inside desired chunks
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std::set<Function *> FuncsToKeep;
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int I = 0, FunctionCount = 0;
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for (auto &F : *Program)
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if (I < (int)ChunksToKeep.size()) {
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if (ChunksToKeep[I].contains(++FunctionCount))
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FuncsToKeep.insert(&F);
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if (FunctionCount == ChunksToKeep[I].end)
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++I;
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}
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// Delete out-of-chunk functions, and replace their calls with undef
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std::vector<Function *> FuncsToRemove;
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SetVector<CallInst *> CallsToRemove;
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for (auto &F : *Program)
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if (!FuncsToKeep.count(&F)) {
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for (auto U : F.users())
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if (auto *Call = dyn_cast<CallInst>(U)) {
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Call->replaceAllUsesWith(UndefValue::get(Call->getType()));
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CallsToRemove.insert(Call);
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}
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F.replaceAllUsesWith(UndefValue::get(F.getType()));
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FuncsToRemove.push_back(&F);
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}
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for (auto *C : CallsToRemove)
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C->eraseFromParent();
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for (auto *F : FuncsToRemove)
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F->eraseFromParent();
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}
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/// Counts the amount of non-declaration functions and prints their
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/// respective name & index
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static int countFunctions(Module *Program) {
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// TODO: Silence index with --quiet flag
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errs() << "----------------------------\n";
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errs() << "Function Index Reference:\n";
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int FunctionCount = 0;
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for (auto &F : *Program)
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errs() << "\t" << ++FunctionCount << ": " << F.getName() << "\n";
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errs() << "----------------------------\n";
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return FunctionCount;
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}
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void llvm::reduceFunctionsDeltaPass(TestRunner &Test) {
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errs() << "*** Reducing Functions...\n";
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int Functions = countFunctions(Test.getProgram());
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runDeltaPass(Test, Functions, extractFunctionsFromModule);
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errs() << "----------------------------\n";
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}
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