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//===--- GenericSpecializationMangler.cpp - mangling of specializations ---===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "swift/SIL/GenericSpecializationMangler.h"
#include "swift/AST/GenericEnvironment.h"
#include "swift/AST/GenericSignature.h"
#include "swift/AST/SubstitutionMap.h"
#include "swift/Demangling/ManglingMacros.h"
using namespace swift;
using namespace Mangle;
void SpecializationMangler::beginMangling() {
ASTMangler::beginManglingWithoutPrefix();
if (Serialized)
ArgOpBuffer << 'q';
if (RemovedEffects.contains(EffectKind::Async))
ArgOpBuffer << 'a';
ArgOpBuffer << char(uint8_t(Pass) + '0');
}
namespace {
/// Utility class for demangling specialization attributes.
class AttributeDemangler : public Demangle::Demangler {
public:
void demangleAndAddAsChildren(StringRef MangledSpecialization,
NodePointer Parent) {
DemangleInitRAII state(*this, MangledSpecialization, nullptr);
if (!parseAndPushNodes()) {
llvm::errs() << "Can't demangle: " << MangledSpecialization << '\n';
abort();
}
for (Node *Nd : NodeStack) {
addChild(Parent, Nd);
}
}
};
} // namespace
std::string SpecializationMangler::finalize() {
StringRef MangledSpecialization(Storage.data(), Storage.size());
AttributeDemangler D;
NodePointer TopLevel = D.createNode(Node::Kind::Global);
D.demangleAndAddAsChildren(MangledSpecialization, TopLevel);
StringRef FuncName = Function ? Function->getName() : StringRef(FunctionName);
NodePointer FuncTopLevel = nullptr;
if (FuncName.starts_with(MANGLING_PREFIX_STR)) {
FuncTopLevel = D.demangleSymbol(FuncName);
assert(FuncTopLevel);
}
if (!FuncTopLevel) {
FuncTopLevel = D.createNode(Node::Kind::Global);
FuncTopLevel->addChild(D.createNode(Node::Kind::Identifier, FuncName), D);
}
for (NodePointer FuncChild : *FuncTopLevel) {
TopLevel->addChild(FuncChild, D);
}
auto mangling = Demangle::mangleNode(TopLevel);
assert(mangling.isSuccess());
std::string mangledName = mangling.result();
verify(mangledName);
return mangledName;
}
//===----------------------------------------------------------------------===//
// Generic Specialization
//===----------------------------------------------------------------------===//
void GenericSpecializationMangler::
appendSubstitutions(GenericSignature sig, SubstitutionMap subs) {
bool First = true;
sig->forEachParam([&](GenericTypeParamType *ParamType, bool Canonical) {
if (Canonical) {
auto ty = Type(ParamType);
auto substTy = ty.subst(subs);
auto canTy = substTy->getCanonicalType();
appendType(canTy, nullptr);
appendListSeparator(First);
}
});
assert(!First && "no generic substitutions");
}
std::string GenericSpecializationMangler::
manglePrespecialized(GenericSignature sig, SubstitutionMap subs) {
beginMangling();
appendSubstitutions(sig, subs);
appendSpecializationOperator("Ts");
return finalize();
}
std::string GenericSpecializationMangler::
mangleNotReabstracted(SubstitutionMap subs,
bool metatyeParamsRemoved) {
beginMangling();
appendSubstitutions(getGenericSignature(), subs);
if (metatyeParamsRemoved) {
appendSpecializationOperator("TGm");
} else {
appendSpecializationOperator("TG");
}
return finalize();
}
std::string GenericSpecializationMangler::
mangleReabstracted(SubstitutionMap subs, bool alternativeMangling,
bool metatyeParamsRemoved) {
beginMangling();
appendSubstitutions(getGenericSignature(), subs);
// See ReabstractionInfo::hasConvertedResilientParams for why and when to use
// the alternative mangling.
if (metatyeParamsRemoved) {
appendSpecializationOperator(alternativeMangling ? "TBm" : "Tgm");
} else {
appendSpecializationOperator(alternativeMangling ? "TB" : "Tg");
}
return finalize();
}
std::string GenericSpecializationMangler::
mangleForDebugInfo(GenericSignature sig, SubstitutionMap subs, bool forInlining) {
beginMangling();
appendSubstitutions(sig, subs);
appendSpecializationOperator(forInlining ? "Ti" : "TG");
return finalize();
}
static SubstitutionMap
getSubstitutionMapForPrespecialization(GenericSignature genericSig,
GenericSignature specSig) {
auto CalleeGenericSig = genericSig;
auto SpecializedGenericSig = specSig;
auto SpecializedGenericEnv = specSig.getGenericEnvironment();
auto CalleeInterfaceToSpecializedInterfaceMap = SubstitutionMap::get(
CalleeGenericSig,
[&](SubstitutableType *type) -> Type {
return type;
},
LookUpConformanceInSignature(CalleeGenericSig.getPointer()));
auto subs = SubstitutionMap::get(
CalleeGenericSig,
[&](SubstitutableType *type) -> Type {
auto SpecializedInterfaceTy =
Type(type).subst(CalleeInterfaceToSpecializedInterfaceMap);
return SpecializedGenericEnv->mapTypeIntoContext(
SpecializedInterfaceTy);
},
LookUpConformanceInSignature(SpecializedGenericSig.getPointer()));
return subs;
}
std::string GenericSpecializationMangler::manglePrespecialization(
std::string unspecializedName, GenericSignature genericSig,
GenericSignature specializedSig) {
auto subs =
getSubstitutionMapForPrespecialization(genericSig, specializedSig);
GenericSpecializationMangler mangler(unspecializedName);
return mangler.manglePrespecialized(genericSig, subs);
}
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