mirror of
https://github.com/RPCS3/llvm.git
synced 2026-07-18 21:24:32 -04:00
Diego Trevino Ferrer
c2ab705011
Summary: Tool parses input IR file, and runs the delta debugging algorithm to reduce the functions inside the input file. Reviewers: alexshap, chandlerc Subscribers: mgorny, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D63672 llvm-svn: 368071 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@368214 91177308-0d34-0410-b5e6-96231b3b80d8
80 lines
2.8 KiB
C++
80 lines
2.8 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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/// 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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/// @returns the Module stripped of out-of-chunk functions
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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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unsigned I = 0, FunctionCount = 0;
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for (auto &F : *Program) {
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if (!F.isDeclaration() && I < 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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}
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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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for (auto &F : *Program) {
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if (!F.isDeclaration() && !FuncsToKeep.count(&F)) {
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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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}
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for (auto *F : FuncsToRemove)
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F->eraseFromParent();
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// Delete instructions with undef calls
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std::vector<Instruction *> InstToRemove;
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for (auto &F : *Program)
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for (auto &BB : F)
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for (auto &I : BB)
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if (auto *Call = dyn_cast<CallInst>(&I))
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if (!Call->getCalledFunction()) {
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// Instruction might be stored / used somewhere else
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I.replaceAllUsesWith(UndefValue::get(I.getType()));
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InstToRemove.push_back(&I);
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}
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for (auto *I : InstToRemove)
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I->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 unsigned countDefinedFunctions(Module *Program) {
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// TODO: Silence index with --quiet flag
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outs() << "----------------------------\n";
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outs() << "Function Index Reference:\n";
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unsigned FunctionCount = 0;
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for (auto &F : *Program)
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if (!F.isDeclaration())
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outs() << "\t" << ++FunctionCount << ": " << F.getName() << "\n";
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outs() << "----------------------------\n";
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return FunctionCount;
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}
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void llvm::reduceFunctionsDeltaPass(TestRunner &Test) {
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outs() << "*** Reducing Functions...\n";
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unsigned Functions = countDefinedFunctions(Test.getProgram());
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runDeltaPass(Test, Functions, extractFunctionsFromModule);
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} |