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//===-- Mutator.h - Utils for randomly mutation IR --------------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// Provides the Mutator class, which is used to mutate IR for fuzzing.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_FUZZMUTATE_RANDOMIRBUILDER_H
#define LLVM_FUZZMUTATE_RANDOMIRBUILDER_H
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/FuzzMutate/IRMutator.h"
#include "llvm/FuzzMutate/Random.h"
#include <random>
namespace llvm {
using RandomEngine = std::mt19937;
struct RandomIRBuilder {
RandomEngine Rand;
SmallVector<Type *, 16> KnownTypes;
RandomIRBuilder(int Seed, ArrayRef<Type *> AllowedTypes)
: Rand(Seed), KnownTypes(AllowedTypes.begin(), AllowedTypes.end()) {}
// TODO: Try to make this a bit less of a random mishmash of functions.
/// Find a "source" for some operation, which will be used in one of the
/// operation's operands. This either selects an instruction in \c Insts or
/// returns some new arbitrary Value.
Value *findOrCreateSource(BasicBlock &BB, ArrayRef<Instruction *> Insts);
/// Find a "source" for some operation, which will be used in one of the
/// operation's operands. This either selects an instruction in \c Insts that
/// matches \c Pred, or returns some new Value that matches \c Pred. The
/// values in \c Srcs should be source operands that have already been
/// selected.
Value *findOrCreateSource(BasicBlock &BB, ArrayRef<Instruction *> Insts,
ArrayRef<Value *> Srcs, fuzzerop::SourcePred Pred);
/// Create some Value suitable as a source for some operation.
Value *newSource(BasicBlock &BB, ArrayRef<Instruction *> Insts,
ArrayRef<Value *> Srcs, fuzzerop::SourcePred Pred);
/// Find a viable user for \c V in \c Insts, which should all be contained in
/// \c BB. This may also create some new instruction in \c BB and use that.
void connectToSink(BasicBlock &BB, ArrayRef<Instruction *> Insts, Value *V);
/// Create a user for \c V in \c BB.
void newSink(BasicBlock &BB, ArrayRef<Instruction *> Insts, Value *V);
Value *findPointer(BasicBlock &BB, ArrayRef<Instruction *> Insts,
ArrayRef<Value *> Srcs, fuzzerop::SourcePred Pred);
Type *chooseType(LLVMContext &Context, ArrayRef<Value *> Srcs,
fuzzerop::SourcePred Pred);
};
} // end llvm namespace
#endif // LLVM_FUZZMUTATE_RANDOMIRBUILDER_H
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