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//===---- ExistentialSpecializerTransform.h - Existential Specializer -----===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
//
// This contains utilities for transforming existential args to generics.
//
//===----------------------------------------------------------------------===//
#ifndef SWIFT_SIL_EXISTENTIALTRANSFORM_H
#define SWIFT_SIL_EXISTENTIALTRANSFORM_H
#include "FunctionSignatureOpts.h"
#include "swift/SIL/SILFunction.h"
#include "swift/SIL/SILInstruction.h"
#include "swift/SILOptimizer/Utils/Existential.h"
#include "swift/SILOptimizer/Utils/InstOptUtils.h"
#include "swift/SILOptimizer/Utils/SILOptFunctionBuilder.h"
#include "swift/SILOptimizer/Utils/SpecializationMangler.h"
#include "llvm/ADT/SmallBitVector.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
namespace swift {
/// A descriptor to carry information from ExistentialTransform analysis
/// to transformation.
struct ExistentialTransformArgumentDescriptor {
OpenedExistentialAccess AccessType;
bool isConsumed;
};
/// ExistentialTransform creates a protocol constrained generic and a thunk.
class ExistentialTransform {
/// Function Builder to create a new thunk.
SILOptFunctionBuilder &FunctionBuilder;
/// The original function to analyze and transform.
SILFunction *F;
/// The newly created inner function.
SILFunction *NewF;
/// The function signature mangler we are using.
Mangle::FunctionSignatureSpecializationMangler &Mangler;
/// List of arguments and their descriptors to specialize
llvm::SmallDenseMap<int, ExistentialTransformArgumentDescriptor>
&ExistentialArgDescriptor;
/// Argument to Generic Type Map for NewF.
llvm::SmallDenseMap<int, GenericTypeParamType *> ArgToGenericTypeMap;
/// Allocate the argument descriptors.
llvm::SmallVector<ArgumentDescriptor, 4> &ArgumentDescList;
/// Create the Devirtualized Inner Function.
void createExistentialSpecializedFunction();
/// Create new generic arguments from existential arguments.
void
convertExistentialArgTypesToGenericArgTypes(
SmallVectorImpl<GenericTypeParamType *> &genericParams,
SmallVectorImpl<Requirement> &requirements);
/// Create a name for the inner function.
std::string createExistentialSpecializedFunctionName();
/// Create the new devirtualized protocol function signature.
CanSILFunctionType createExistentialSpecializedFunctionType();
/// Create the thunk.
void populateThunkBody();
public:
/// Constructor.
ExistentialTransform(
SILOptFunctionBuilder &FunctionBuilder, SILFunction *F,
Mangle::FunctionSignatureSpecializationMangler &Mangler,
llvm::SmallVector<ArgumentDescriptor, 4> &ADL,
llvm::SmallDenseMap<int, ExistentialTransformArgumentDescriptor>
&ExistentialArgDescriptor)
: FunctionBuilder(FunctionBuilder), F(F), NewF(nullptr), Mangler(Mangler),
ExistentialArgDescriptor(ExistentialArgDescriptor),
ArgumentDescList(ADL) {}
/// Return the optimized iner function.
SILFunction *getExistentialSpecializedFunction() { return NewF; }
/// External function for the optimization.
bool run() {
createExistentialSpecializedFunction();
return true;
}
};
} // end namespace swift
#endif
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