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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
223 lines
7.1 KiB
C++
223 lines
7.1 KiB
C++
//===-- OpDescriptor.h ------------------------------------------*- 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 fuzzerop::Descriptor class and related tools for describing
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// operations an IR fuzzer can work with.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_FUZZMUTATE_OPDESCRIPTOR_H
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#define LLVM_FUZZMUTATE_OPDESCRIPTOR_H
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/IR/Constants.h"
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#include "llvm/IR/DerivedTypes.h"
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#include "llvm/IR/Instructions.h"
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#include "llvm/IR/Type.h"
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#include "llvm/IR/Value.h"
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#include <functional>
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namespace llvm {
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namespace fuzzerop {
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/// @{
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/// Populate a small list of potentially interesting constants of a given type.
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void makeConstantsWithType(Type *T, std::vector<Constant *> &Cs);
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std::vector<Constant *> makeConstantsWithType(Type *T);
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/// @}
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/// A matcher/generator for finding suitable values for the next source in an
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/// operation's partially completed argument list.
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///
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/// Given that we're building some operation X and may have already filled some
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/// subset of its operands, this predicate determines if some value New is
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/// suitable for the next operand or generates a set of values that are
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/// suitable.
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class SourcePred {
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public:
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/// Given a list of already selected operands, returns whether a given new
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/// operand is suitable for the next operand.
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using PredT = std::function<bool(ArrayRef<Value *> Cur, const Value *New)>;
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/// Given a list of already selected operands and a set of valid base types
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/// for a fuzzer, generates a list of constants that could be used for the
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/// next operand.
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using MakeT = std::function<std::vector<Constant *>(
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ArrayRef<Value *> Cur, ArrayRef<Type *> BaseTypes)>;
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private:
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PredT Pred;
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MakeT Make;
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public:
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/// Create a fully general source predicate.
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SourcePred(PredT Pred, MakeT Make) : Pred(Pred), Make(Make) {}
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SourcePred(PredT Pred, NoneType) : Pred(Pred) {
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Make = [Pred](ArrayRef<Value *> Cur, ArrayRef<Type *> BaseTypes) {
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// Default filter just calls Pred on each of the base types.
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std::vector<Constant *> Result;
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for (Type *T : BaseTypes) {
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Constant *V = UndefValue::get(T);
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if (Pred(Cur, V))
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makeConstantsWithType(T, Result);
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}
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if (Result.empty())
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report_fatal_error("Predicate does not match for base types");
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return Result;
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};
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}
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/// Returns true if \c New is compatible for the argument after \c Cur
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bool matches(ArrayRef<Value *> Cur, const Value *New) {
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return Pred(Cur, New);
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}
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/// Generates a list of potential values for the argument after \c Cur.
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std::vector<Constant *> generate(ArrayRef<Value *> Cur,
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ArrayRef<Type *> BaseTypes) {
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return Make(Cur, BaseTypes);
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}
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};
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/// A description of some operation we can build while fuzzing IR.
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struct OpDescriptor {
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unsigned Weight;
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SmallVector<SourcePred, 2> SourcePreds;
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std::function<Value *(ArrayRef<Value *>, Instruction *)> BuilderFunc;
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};
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static inline SourcePred onlyType(Type *Only) {
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auto Pred = [Only](ArrayRef<Value *>, const Value *V) {
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return V->getType() == Only;
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};
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auto Make = [Only](ArrayRef<Value *>, ArrayRef<Type *>) {
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return makeConstantsWithType(Only);
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};
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return {Pred, Make};
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}
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static inline SourcePred anyType() {
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auto Pred = [](ArrayRef<Value *>, const Value *V) {
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return !V->getType()->isVoidTy();
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};
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auto Make = None;
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return {Pred, Make};
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}
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static inline SourcePred anyIntType() {
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auto Pred = [](ArrayRef<Value *>, const Value *V) {
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return V->getType()->isIntegerTy();
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};
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auto Make = None;
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return {Pred, Make};
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}
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static inline SourcePred anyFloatType() {
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auto Pred = [](ArrayRef<Value *>, const Value *V) {
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return V->getType()->isFloatingPointTy();
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};
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auto Make = None;
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return {Pred, Make};
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}
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static inline SourcePred anyPtrType() {
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auto Pred = [](ArrayRef<Value *>, const Value *V) {
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return V->getType()->isPointerTy() && !V->isSwiftError();
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};
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auto Make = [](ArrayRef<Value *>, ArrayRef<Type *> Ts) {
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std::vector<Constant *> Result;
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// TODO: Should these point at something?
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for (Type *T : Ts)
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Result.push_back(UndefValue::get(PointerType::getUnqual(T)));
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return Result;
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};
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return {Pred, Make};
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}
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static inline SourcePred sizedPtrType() {
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auto Pred = [](ArrayRef<Value *>, const Value *V) {
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if (V->isSwiftError())
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return false;
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if (const auto *PtrT = dyn_cast<PointerType>(V->getType()))
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return PtrT->getElementType()->isSized();
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return false;
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};
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auto Make = [](ArrayRef<Value *>, ArrayRef<Type *> Ts) {
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std::vector<Constant *> Result;
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for (Type *T : Ts)
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if (T->isSized())
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Result.push_back(UndefValue::get(PointerType::getUnqual(T)));
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return Result;
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};
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return {Pred, Make};
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}
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static inline SourcePred anyAggregateType() {
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auto Pred = [](ArrayRef<Value *>, const Value *V) {
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// We can't index zero sized arrays.
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if (isa<ArrayType>(V->getType()))
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return V->getType()->getArrayNumElements() > 0;
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// Structs can also be zero sized. I.e opaque types.
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if (isa<StructType>(V->getType()))
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return V->getType()->getStructNumElements() > 0;
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return V->getType()->isAggregateType();
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};
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// TODO: For now we only find aggregates in BaseTypes. It might be better to
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// manufacture them out of the base types in some cases.
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auto Find = None;
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return {Pred, Find};
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}
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static inline SourcePred anyVectorType() {
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auto Pred = [](ArrayRef<Value *>, const Value *V) {
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return V->getType()->isVectorTy();
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};
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// TODO: For now we only find vectors in BaseTypes. It might be better to
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// manufacture vectors out of the base types, but it's tricky to be sure
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// that's actually a reasonable type.
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auto Make = None;
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return {Pred, Make};
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}
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/// Match values that have the same type as the first source.
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static inline SourcePred matchFirstType() {
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auto Pred = [](ArrayRef<Value *> Cur, const Value *V) {
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assert(!Cur.empty() && "No first source yet");
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return V->getType() == Cur[0]->getType();
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};
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auto Make = [](ArrayRef<Value *> Cur, ArrayRef<Type *>) {
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assert(!Cur.empty() && "No first source yet");
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return makeConstantsWithType(Cur[0]->getType());
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};
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return {Pred, Make};
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}
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/// Match values that have the first source's scalar type.
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static inline SourcePred matchScalarOfFirstType() {
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auto Pred = [](ArrayRef<Value *> Cur, const Value *V) {
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assert(!Cur.empty() && "No first source yet");
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return V->getType() == Cur[0]->getType()->getScalarType();
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};
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auto Make = [](ArrayRef<Value *> Cur, ArrayRef<Type *>) {
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assert(!Cur.empty() && "No first source yet");
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return makeConstantsWithType(Cur[0]->getType()->getScalarType());
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};
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return {Pred, Make};
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}
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} // end fuzzerop namespace
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} // end llvm namespace
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#endif // LLVM_FUZZMUTATE_OPDESCRIPTOR_H
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