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//===--- GenPoly.cpp - Swift IR Generation for Polymorphism ---------------===//
//
// 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 file implements IR generation for polymorphic operations in Swift.
//
//===----------------------------------------------------------------------===//
#include "swift/AST/ASTContext.h"
#include "swift/AST/ASTVisitor.h"
#include "swift/AST/Types.h"
#include "swift/AST/Decl.h"
#include "swift/AST/GenericEnvironment.h"
#include "swift/SIL/SILInstruction.h"
#include "swift/SIL/SILModule.h"
#include "swift/SIL/SILType.h"
#include "llvm/IR/DerivedTypes.h"
#include "Explosion.h"
#include "IRGenFunction.h"
#include "IRGenModule.h"
#include "LoadableTypeInfo.h"
#include "TypeVisitor.h"
#include "GenTuple.h"
#include "GenPoly.h"
#include "GenType.h"
using namespace swift;
using namespace irgen;
static SILType applyPrimaryArchetypes(IRGenFunction &IGF,
SILType type) {
if (!type.hasTypeParameter()) {
return type;
}
auto substType =
IGF.IGM.getGenericEnvironment()->mapTypeIntoContext(type.getASTType())
->getCanonicalType();
return SILType::getPrimitiveType(substType, type.getCategory());
}
/// Given a substituted explosion, re-emit it as an unsubstituted one.
///
/// For example, given an explosion which begins with the
/// representation of an (Int, Float), consume that and produce the
/// representation of an (Int, T).
///
/// The substitutions must carry origTy to substTy.
void irgen::reemitAsUnsubstituted(IRGenFunction &IGF,
SILType expectedTy, SILType substTy,
Explosion &in, Explosion &out) {
expectedTy = applyPrimaryArchetypes(IGF, expectedTy);
ExplosionSchema expectedSchema;
cast<LoadableTypeInfo>(IGF.IGM.getTypeInfo(expectedTy))
.getSchema(expectedSchema);
#ifndef NDEBUG
auto &substTI = IGF.IGM.getTypeInfo(applyPrimaryArchetypes(IGF, substTy));
assert(expectedSchema.size() ==
cast<LoadableTypeInfo>(substTI).getExplosionSize());
#endif
for (ExplosionSchema::Element &elt : expectedSchema) {
llvm::Value *value = in.claimNext();
assert(elt.isScalar());
// The only type differences we expect here should be due to
// substitution of class archetypes.
if (value->getType() != elt.getScalarType()) {
value = IGF.Builder.CreateBitCast(value, elt.getScalarType(),
value->getName() + ".asUnsubstituted");
}
out.add(value);
}
}
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