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