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GenFunc.cpp
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//===--- GenFunc.cpp - Swift IR Generation for Function Types -------------===//
//
// 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 function types in Swift. This
// includes creating the IR type as well as capturing variables and
// performing calls.
//
// Swift supports three representations of functions:
//
// - thin, which are just a function pointer;
//
// - thick, which are a pair of a function pointer and
// an optional ref-counted opaque context pointer; and
//
// - block, which match the Apple blocks extension: a ref-counted
// pointer to a mostly-opaque structure with the function pointer
// stored at a fixed offset.
//
// The order of function parameters is as follows:
//
// - indirect return pointer
// - block context parameter, if applicable
// - expanded formal parameter types
// - implicit generic parameters
// - thick context parameter, if applicable
// - error result out-parameter, if applicable
// - witness_method generic parameters, if applicable
//
// The context and error parameters are last because they are
// optional: we'd like to be able to turn a thin function into a
// thick function, or a non-throwing function into a throwing one,
// without adding a thunk. A thick context parameter is required
// (but can be passed undef) if an error result is required.
//
// The additional generic parameters for witness methods follow the
// same logic: we'd like to be able to use non-generic method
// implementations directly as protocol witnesses if the rest of the
// ABI matches up.
//
// Note that some of this business with context parameters and error
// results is just IR formalism; on most of our targets, both of
// these are passed in registers. This is also why passing them
// as the final argument isn't bad for performance.
//
// For now, function pointer types are always stored as opaque
// pointers in LLVM IR; using a well-typed function type is
// very challenging because of issues with recursive type expansion,
// which can potentially introduce infinite types. For example:
// struct A {
// var fn: (A) -> ()
// }
// Our CC lowering expands the fields of A into the argument list
// of A.fn, which is necessarily infinite. Attempting to use better
// types when not in a situation like this would just make the
// compiler complacent, leading to a long tail of undiscovered
// crashes. So instead we always store as i8* and require the
// bitcast whenever we change representations.
//
//===----------------------------------------------------------------------===//
#include "swift/AST/ASTContext.h"
#include "swift/AST/ASTWalker.h"
#include "swift/AST/Builtins.h"
#include "swift/AST/Decl.h"
#include "swift/AST/IRGenOptions.h"
#include "swift/AST/Module.h"
#include "swift/AST/Pattern.h"
#include "swift/AST/PrettyStackTrace.h"
#include "swift/AST/SubstitutionMap.h"
#include "swift/AST/Types.h"
#include "clang/CodeGen/CodeGenABITypes.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/Module.h"
#include "llvm/ProfileData/InstrProf.h"
#include "llvm/Support/Debug.h"
#include "llvm/ADT/StringSwitch.h"
#include "Callee.h"
#include "ConstantBuilder.h"
#include "EnumPayload.h"
#include "Explosion.h"
#include "FixedTypeInfo.h"
#include "GenCall.h"
#include "GenClass.h"
#include "GenFunc.h"
#include "GenHeap.h"
#include "GenMeta.h"
#include "GenObjC.h"
#include "GenPoly.h"
#include "GenProto.h"
#include "GenType.h"
#include "HeapTypeInfo.h"
#include "IRGenDebugInfo.h"
#include "IRGenFunction.h"
#include "IRGenModule.h"
#include "IndirectTypeInfo.h"
#include "NativeConventionSchema.h"
#include "ScalarTypeInfo.h"
#include "Signature.h"
#include "IRGenMangler.h"
using namespace swift;
using namespace irgen;
namespace {
/// Information about the IR-level signature of a function type.
class FuncSignatureInfo {
private:
/// The SIL function type being represented.
const CanSILFunctionType FormalType;
mutable Signature TheSignature;
public:
FuncSignatureInfo(CanSILFunctionType formalType)
: FormalType(formalType) {}
Signature getSignature(IRGenModule &IGM) const;
};
/// The @thin function type-info class.
class ThinFuncTypeInfo : public PODSingleScalarTypeInfo<ThinFuncTypeInfo,
LoadableTypeInfo>,
public FuncSignatureInfo {
ThinFuncTypeInfo(CanSILFunctionType formalType, llvm::Type *storageType,
Size size, Alignment align,
const SpareBitVector &spareBits)
: PODSingleScalarTypeInfo(storageType, size, spareBits, align),
FuncSignatureInfo(formalType)
{
}
public:
static const ThinFuncTypeInfo *create(CanSILFunctionType formalType,
llvm::Type *storageType,
Size size, Alignment align,
const SpareBitVector &spareBits) {
return new ThinFuncTypeInfo(formalType, storageType, size, align,
spareBits);
}
bool mayHaveExtraInhabitants(IRGenModule &IGM) const override {
return true;
}
unsigned getFixedExtraInhabitantCount(IRGenModule &IGM) const override {
return getFunctionPointerExtraInhabitantCount(IGM);
}
APInt getFixedExtraInhabitantValue(IRGenModule &IGM,
unsigned bits,
unsigned index) const override {
return getFunctionPointerFixedExtraInhabitantValue(IGM, bits, index, 0);
}
llvm::Value *getExtraInhabitantIndex(IRGenFunction &IGF, Address src,
SILType T, bool isOutlined)
const override {
return getFunctionPointerExtraInhabitantIndex(IGF, src);
}
void storeExtraInhabitant(IRGenFunction &IGF, llvm::Value *index,
Address dest, SILType T, bool isOutlined)
const override {
return storeFunctionPointerExtraInhabitant(IGF, index, dest);
}
};
/// The @thick function type-info class.
class FuncTypeInfo : public ScalarTypeInfo<FuncTypeInfo, ReferenceTypeInfo>,
public FuncSignatureInfo {
FuncTypeInfo(CanSILFunctionType formalType, llvm::StructType *storageType,
Size size, Alignment align, SpareBitVector &&spareBits,
IsPOD_t pod)
: ScalarTypeInfo(storageType, size, std::move(spareBits), align, pod),
FuncSignatureInfo(formalType)
{
}
public:
static const FuncTypeInfo *create(CanSILFunctionType formalType,
llvm::StructType *storageType,
Size size, Alignment align,
SpareBitVector &&spareBits,
IsPOD_t pod) {
return new FuncTypeInfo(formalType, storageType, size, align,
std::move(spareBits), pod);
}
// Function types do not satisfy allowsOwnership.
#define REF_STORAGE(Name, name, ...) \
const TypeInfo * \
create##Name##StorageType(TypeConverter &TC, \
bool isOptional) const override { \
llvm_unreachable("[" #name "] function type"); \
}
#include "swift/AST/ReferenceStorage.def"
llvm::StructType *getStorageType() const {
return cast<llvm::StructType>(TypeInfo::getStorageType());
}
unsigned getExplosionSize() const override {
return 2;
}
void getSchema(ExplosionSchema &schema) const override {
llvm::StructType *structTy = getStorageType();
schema.add(ExplosionSchema::Element::forScalar(structTy->getElementType(0)));
schema.add(ExplosionSchema::Element::forScalar(structTy->getElementType(1)));
}
void addToAggLowering(IRGenModule &IGM, SwiftAggLowering &lowering,
Size offset) const override {
auto ptrSize = IGM.getPointerSize();
llvm::StructType *structTy = getStorageType();
addScalarToAggLowering(IGM, lowering, structTy->getElementType(0),
offset, ptrSize);
addScalarToAggLowering(IGM, lowering, structTy->getElementType(1),
offset + ptrSize, ptrSize);
}
Address projectFunction(IRGenFunction &IGF, Address address) const {
return IGF.Builder.CreateStructGEP(address, 0, Size(0),
address->getName() + ".fn");
}
Address projectData(IRGenFunction &IGF, Address address) const {
return IGF.Builder.CreateStructGEP(address, 1, IGF.IGM.getPointerSize(),
address->getName() + ".data");
}
void loadAsCopy(IRGenFunction &IGF, Address address,
Explosion &e) const override {
// Load the function.
Address fnAddr = projectFunction(IGF, address);
e.add(IGF.Builder.CreateLoad(fnAddr, fnAddr->getName()+".load"));
Address dataAddr = projectData(IGF, address);
auto data = IGF.Builder.CreateLoad(dataAddr);
if (!isPOD(ResilienceExpansion::Maximal))
IGF.emitNativeStrongRetain(data, IGF.getDefaultAtomicity());
e.add(data);
}
void loadAsTake(IRGenFunction &IGF, Address addr,
Explosion &e) const override {
// Load the function.
Address fnAddr = projectFunction(IGF, addr);
e.add(IGF.Builder.CreateLoad(fnAddr));
Address dataAddr = projectData(IGF, addr);
e.add(IGF.Builder.CreateLoad(dataAddr));
}
void assign(IRGenFunction &IGF, Explosion &e, Address address,
bool isOutlined) const override {
// Store the function pointer.
Address fnAddr = projectFunction(IGF, address);
IGF.Builder.CreateStore(e.claimNext(), fnAddr);
Address dataAddr = projectData(IGF, address);
auto context = e.claimNext();
if (isPOD(ResilienceExpansion::Maximal))
IGF.Builder.CreateStore(context, dataAddr);
else
IGF.emitNativeStrongAssign(context, dataAddr);
}
void initialize(IRGenFunction &IGF, Explosion &e, Address address,
bool isOutlined) const override {
// Store the function pointer.
Address fnAddr = projectFunction(IGF, address);
IGF.Builder.CreateStore(e.claimNext(), fnAddr);
// Store the data pointer, if any, transferring the +1.
Address dataAddr = projectData(IGF, address);
auto context = e.claimNext();
if (isPOD(ResilienceExpansion::Maximal))
IGF.Builder.CreateStore(context, dataAddr);
else
IGF.emitNativeStrongInit(context, dataAddr);
}
void copy(IRGenFunction &IGF, Explosion &src,
Explosion &dest, Atomicity atomicity) const override {
src.transferInto(dest, 1);
auto data = src.claimNext();
if (!isPOD(ResilienceExpansion::Maximal))
IGF.emitNativeStrongRetain(data, atomicity);
dest.add(data);
}
void consume(IRGenFunction &IGF, Explosion &src,
Atomicity atomicity) const override {
src.claimNext();
auto context = src.claimNext();
if (!isPOD(ResilienceExpansion::Maximal))
IGF.emitNativeStrongRelease(context, atomicity);
}
void fixLifetime(IRGenFunction &IGF, Explosion &src) const override {
src.claimNext();
IGF.emitFixLifetime(src.claimNext());
}
void strongRetain(IRGenFunction &IGF, Explosion &e,
Atomicity atomicity) const override {
e.claimNext();
auto context = e.claimNext();
if (!isPOD(ResilienceExpansion::Maximal))
IGF.emitNativeStrongRetain(context, atomicity);
}
void strongRelease(IRGenFunction &IGF, Explosion &e,
Atomicity atomicity) const override {
e.claimNext();
auto context = e.claimNext();
if (!isPOD(ResilienceExpansion::Maximal))
IGF.emitNativeStrongRelease(context, atomicity);
}
#define NEVER_LOADABLE_CHECKED_REF_STORAGE(Name, name, ...) \
void name##LoadStrong(IRGenFunction &IGF, Address src, \
Explosion &out, bool isOptional) const override { \
llvm_unreachable(#name " references to functions are not supported"); \
} \
void name##TakeStrong(IRGenFunction &IGF, Address src, \
Explosion &out, bool isOptional) const override { \
llvm_unreachable(#name " references to functions are not supported"); \
} \
void name##Init(IRGenFunction &IGF, Explosion &in, \
Address dest, bool isOptional) const override { \
llvm_unreachable(#name " references to functions are not supported"); \
} \
void name##Assign(IRGenFunction &IGF, Explosion &in, \
Address dest, bool isOptional) const override { \
llvm_unreachable(#name " references to functions are not supported"); \
}
#define ALWAYS_LOADABLE_CHECKED_REF_STORAGE(Name, name, ...) \
void strongRetain##Name(IRGenFunction &IGF, Explosion &e, \
Atomicity atomicity) const override { \
llvm_unreachable(#name " references to functions are not supported"); \
} \
void strongRetain##Name##Release(IRGenFunction &IGF, \
Explosion &e, \
Atomicity atomicity) const override { \
llvm_unreachable(#name " references to functions are not supported"); \
} \
void name##Retain(IRGenFunction &IGF, Explosion &e, \
Atomicity atomicity) const override { \
llvm_unreachable(#name " references to functions are not supported"); \
} \
void name##Release(IRGenFunction &IGF, Explosion &e, \
Atomicity atomicity) const override { \
llvm_unreachable(#name " references to functions are not supported"); \
}
#define SOMETIMES_LOADABLE_CHECKED_REF_STORAGE(Name, name, ...) \
NEVER_LOADABLE_CHECKED_REF_STORAGE(Name, name, "...") \
ALWAYS_LOADABLE_CHECKED_REF_STORAGE(Name, name, "...")
#include "swift/AST/ReferenceStorage.def"
void destroy(IRGenFunction &IGF, Address addr, SILType T,
bool isOutlined) const override {
auto data = IGF.Builder.CreateLoad(projectData(IGF, addr));
if (!isPOD(ResilienceExpansion::Maximal))
IGF.emitNativeStrongRelease(data, IGF.getDefaultAtomicity());
}
void packIntoEnumPayload(IRGenFunction &IGF,
EnumPayload &payload,
Explosion &src,
unsigned offset) const override {
payload.insertValue(IGF, src.claimNext(), offset);
payload.insertValue(IGF, src.claimNext(),
offset + IGF.IGM.getPointerSize().getValueInBits());
}
void unpackFromEnumPayload(IRGenFunction &IGF,
const EnumPayload &payload,
Explosion &dest,
unsigned offset) const override {
auto storageTy = getStorageType();
dest.add(payload.extractValue(IGF, storageTy->getElementType(0), offset));
dest.add(payload.extractValue(IGF, storageTy->getElementType(1),
offset + IGF.IGM.getPointerSize().getValueInBits()));
}
bool mayHaveExtraInhabitants(IRGenModule &IGM) const override {
return true;
}
unsigned getFixedExtraInhabitantCount(IRGenModule &IGM) const override {
return getFunctionPointerExtraInhabitantCount(IGM);
}
APInt getFixedExtraInhabitantValue(IRGenModule &IGM,
unsigned bits,
unsigned index) const override {
return getFunctionPointerFixedExtraInhabitantValue(IGM, bits, index, 0);
}
llvm::Value *getExtraInhabitantIndex(IRGenFunction &IGF, Address src,
SILType T, bool isOutlined)
const override {
src = projectFunction(IGF, src);
return getFunctionPointerExtraInhabitantIndex(IGF, src);
}
APInt getFixedExtraInhabitantMask(IRGenModule &IGM) const override {
// Only the function pointer value is used for extra inhabitants.
auto pointerSize = IGM.getPointerSize().getValueInBits();
APInt bits = APInt::getAllOnesValue(pointerSize);
bits = bits.zext(pointerSize * 2);
return bits;
}
void storeExtraInhabitant(IRGenFunction &IGF, llvm::Value *index,
Address dest, SILType T, bool isOutlined)
const override {
dest = projectFunction(IGF, dest);
return storeFunctionPointerExtraInhabitant(IGF, index, dest);
}
};
/// The type-info class for ObjC blocks, which are represented by an ObjC
/// heap pointer.
class BlockTypeInfo : public HeapTypeInfo<BlockTypeInfo>,
public FuncSignatureInfo
{
public:
BlockTypeInfo(CanSILFunctionType ty,
llvm::PointerType *storageType,
Size size, SpareBitVector spareBits, Alignment align)
: HeapTypeInfo(storageType, size, spareBits, align),
FuncSignatureInfo(ty)
{
}
ReferenceCounting getReferenceCounting() const {
return ReferenceCounting::Block;
}
};
/// The type info class for the on-stack representation of an ObjC block.
///
/// TODO: May not be fixed-layout if we capture generics.
class BlockStorageTypeInfo final
: public IndirectTypeInfo<BlockStorageTypeInfo, FixedTypeInfo>
{
Size CaptureOffset;
public:
BlockStorageTypeInfo(llvm::Type *type, Size size, Alignment align,
SpareBitVector &&spareBits,
IsPOD_t pod, IsBitwiseTakable_t bt, Size captureOffset)
: IndirectTypeInfo(type, size, std::move(spareBits), align, pod, bt,
IsFixedSize),
CaptureOffset(captureOffset)
{}
// The lowered type should be an LLVM struct comprising the block header
// (IGM.ObjCBlockStructTy) as its first element and the capture as its
// second.
Address projectBlockHeader(IRGenFunction &IGF, Address storage) const {
return IGF.Builder.CreateStructGEP(storage, 0, Size(0));
}
Address projectCapture(IRGenFunction &IGF, Address storage) const {
return IGF.Builder.CreateStructGEP(storage, 1, CaptureOffset);
}
// TODO
// The frontend will currently never emit copy_addr or destroy_addr for
// block storage.
void assignWithCopy(IRGenFunction &IGF, Address dest, Address src,
SILType T, bool isOutlined) const override {
IGF.unimplemented(SourceLoc(), "copying @block_storage");
}
void initializeWithCopy(IRGenFunction &IGF, Address dest, Address src,
SILType T, bool isOutlined) const override {
IGF.unimplemented(SourceLoc(), "copying @block_storage");
}
void destroy(IRGenFunction &IGF, Address addr, SILType T,
bool isOutlined) const override {
IGF.unimplemented(SourceLoc(), "destroying @block_storage");
}
};
} // end anonymous namespace
const TypeInfo *TypeConverter::convertBlockStorageType(SILBlockStorageType *T) {
// The block storage consists of the block header (ObjCBlockStructTy)
// followed by the lowered type of the capture.
auto &capture = IGM.getTypeInfoForLowered(T->getCaptureType());
// TODO: Support dynamic-sized captures.
const auto *fixedCapture = dyn_cast<FixedTypeInfo>(&capture);
llvm::Type *fixedCaptureTy;
// The block header is pointer aligned. The capture may be worse aligned.
Alignment align = IGM.getPointerAlignment();
Size captureOffset(
IGM.DataLayout.getStructLayout(IGM.ObjCBlockStructTy)->getSizeInBytes());
Size size = captureOffset;
SpareBitVector spareBits =
SpareBitVector::getConstant(size.getValueInBits(), false);
IsPOD_t pod = IsNotPOD;
IsBitwiseTakable_t bt = IsNotBitwiseTakable;
if (!fixedCapture) {
IGM.unimplemented(SourceLoc(), "dynamic @block_storage capture");
fixedCaptureTy = llvm::StructType::get(IGM.getLLVMContext(), {});
} else {
fixedCaptureTy = cast<FixedTypeInfo>(capture).getStorageType();
align = std::max(align, fixedCapture->getFixedAlignment());
captureOffset = captureOffset.roundUpToAlignment(align);
spareBits.extendWithSetBits(captureOffset.getValueInBits());
size = captureOffset + fixedCapture->getFixedSize();
spareBits.append(fixedCapture->getSpareBits());
pod = fixedCapture->isPOD(ResilienceExpansion::Maximal);
bt = fixedCapture->isBitwiseTakable(ResilienceExpansion::Maximal);
}
llvm::Type *storageElts[] = {
IGM.ObjCBlockStructTy,
fixedCaptureTy,
};
auto storageTy = llvm::StructType::get(IGM.getLLVMContext(), storageElts,
/*packed*/ false);
return new BlockStorageTypeInfo(storageTy, size, align, std::move(spareBits),
pod, bt, captureOffset);
}
Address irgen::projectBlockStorageCapture(IRGenFunction &IGF,
Address storageAddr,
CanSILBlockStorageType storageTy) {
auto &tl = IGF.getTypeInfoForLowered(storageTy).as<BlockStorageTypeInfo>();
return tl.projectCapture(IGF, storageAddr);
}
const TypeInfo *TypeConverter::convertFunctionType(SILFunctionType *T) {
switch (T->getRepresentation()) {
case SILFunctionType::Representation::Block:
return new BlockTypeInfo(CanSILFunctionType(T),
IGM.ObjCBlockPtrTy,
IGM.getPointerSize(),
IGM.getHeapObjectSpareBits(),
IGM.getPointerAlignment());
case SILFunctionType::Representation::Thin:
case SILFunctionType::Representation::Method:
case SILFunctionType::Representation::WitnessMethod:
case SILFunctionType::Representation::ObjCMethod:
case SILFunctionType::Representation::CFunctionPointer:
case SILFunctionType::Representation::Closure:
return ThinFuncTypeInfo::create(CanSILFunctionType(T),
IGM.FunctionPtrTy,
IGM.getPointerSize(),
IGM.getPointerAlignment(),
IGM.getFunctionPointerSpareBits());
case SILFunctionType::Representation::Thick: {
SpareBitVector spareBits;
spareBits.append(IGM.getFunctionPointerSpareBits());
spareBits.append(IGM.getHeapObjectSpareBits());
if (T->isNoEscape()) {
// @noescape thick functions are trivial types.
return FuncTypeInfo::create(
CanSILFunctionType(T), IGM.NoEscapeFunctionPairTy,
IGM.getPointerSize() * 2, IGM.getPointerAlignment(),
std::move(spareBits), IsPOD);
}
return FuncTypeInfo::create(
CanSILFunctionType(T), IGM.FunctionPairTy, IGM.getPointerSize() * 2,
IGM.getPointerAlignment(), std::move(spareBits), IsNotPOD);
}
}
llvm_unreachable("bad function type representation");
}
Signature FuncSignatureInfo::getSignature(IRGenModule &IGM) const {
// If it's already been filled in, we're done.
if (TheSignature.isValid())
return TheSignature;
// Update the cache and return.
TheSignature = Signature::getUncached(IGM, FormalType);
assert(TheSignature.isValid());
return TheSignature;
}
static const FuncSignatureInfo &
getFuncSignatureInfoForLowered(IRGenModule &IGM, CanSILFunctionType type) {
auto &ti = IGM.getTypeInfoForLowered(type);
switch (type->getRepresentation()) {
case SILFunctionType::Representation::Block:
return ti.as<BlockTypeInfo>();
case SILFunctionType::Representation::Thin:
case SILFunctionType::Representation::CFunctionPointer:
case SILFunctionType::Representation::Method:
case SILFunctionType::Representation::WitnessMethod:
case SILFunctionType::Representation::ObjCMethod:
case SILFunctionType::Representation::Closure:
return ti.as<ThinFuncTypeInfo>();
case SILFunctionType::Representation::Thick:
return ti.as<FuncTypeInfo>();
}
llvm_unreachable("bad function type representation");
}
Signature
IRGenModule::getSignature(CanSILFunctionType type) {
auto &sigInfo = getFuncSignatureInfoForLowered(*this, type);
return sigInfo.getSignature(*this);
}
llvm::FunctionType *
IRGenModule::getFunctionType(CanSILFunctionType type,
llvm::AttributeList &attrs,
ForeignFunctionInfo *foreignInfo) {
auto &sigInfo = getFuncSignatureInfoForLowered(*this, type);
Signature sig = sigInfo.getSignature(*this);
attrs = sig.getAttributes();
if (foreignInfo) *foreignInfo = sig.getForeignInfo();
return sig.getType();
}
ForeignFunctionInfo
IRGenModule::getForeignFunctionInfo(CanSILFunctionType type) {
if (type->getLanguage() == SILFunctionLanguage::Swift)
return ForeignFunctionInfo();
auto &sigInfo = getFuncSignatureInfoForLowered(*this, type);
return sigInfo.getSignature(*this).getForeignInfo();
}
static void emitApplyArgument(IRGenFunction &IGF,
SILParameterInfo origParam,
SILParameterInfo substParam,
Explosion &in,
Explosion &out) {
auto silConv = IGF.IGM.silConv;
bool isSubstituted =
(silConv.getSILType(substParam) != silConv.getSILType(origParam));
// For indirect arguments, we just need to pass a pointer.
if (silConv.isSILIndirect(origParam)) {
// This address is of the substituted type.
auto addr = in.claimNext();
// If a substitution is in play, just bitcast the address.
if (isSubstituted) {
auto origType =
IGF.IGM.getStoragePointerType(silConv.getSILType(origParam));
addr = IGF.Builder.CreateBitCast(addr, origType);
}
out.add(addr);
return;
}
assert(!silConv.isSILIndirect(origParam)
&& "Unexpected opaque apply parameter.");
// Otherwise, it's an explosion, which we may need to translate,
// both in terms of explosion level and substitution levels.
// Handle the last unsubstituted case.
if (!isSubstituted) {
auto &substArgTI =
cast<LoadableTypeInfo>(IGF.getTypeInfo(silConv.getSILType(substParam)));
substArgTI.reexplode(IGF, in, out);
return;
}
reemitAsUnsubstituted(IGF, silConv.getSILType(origParam),
silConv.getSILType(substParam), in, out);
}
static CanType getArgumentLoweringType(CanType type,
SILParameterInfo paramInfo) {
switch (paramInfo.getConvention()) {
// Capture value parameters by value, consuming them.
case ParameterConvention::Direct_Owned:
case ParameterConvention::Direct_Unowned:
case ParameterConvention::Direct_Guaranteed:
case ParameterConvention::Indirect_In:
case ParameterConvention::Indirect_In_Constant:
case ParameterConvention::Indirect_In_Guaranteed:
return type;
// Capture inout parameters by pointer.
case ParameterConvention::Indirect_Inout:
case ParameterConvention::Indirect_InoutAliasable:
return CanInOutType::get(type);
}
}
static bool isABIIgnoredParameterWithoutStorage(IRGenModule &IGM,
IRGenFunction &IGF,
CanSILFunctionType substType,
unsigned paramIdx) {
auto param = substType->getParameters()[paramIdx];
SILType argType = IGM.silConv.getSILType(param);
auto argLoweringTy = getArgumentLoweringType(argType.getASTType(), param);
auto &ti = IGF.getTypeInfoForLowered(argLoweringTy);
// Empty values don't matter.
return ti.getSchema().empty() && !param.isFormalIndirect();
}
/// Find the parameter index for the one (assuming there was only one) partially
/// applied argument ignoring empty types that are not passed as part of the
/// ABI.
static unsigned findSinglePartiallyAppliedParameterIndexIgnoringEmptyTypes(
IRGenFunction &IGF, CanSILFunctionType substType,
CanSILFunctionType outType) {
auto substParameters = substType->getParameters();
auto outParamters = outType->getParameters();
unsigned firstNonEmpty = -1U;
for (unsigned paramIdx = outParamters.size() ; paramIdx != substParameters.size(); ++paramIdx) {
bool isEmpty =
isABIIgnoredParameterWithoutStorage(IGF.IGM, IGF, substType, paramIdx);
assert((isEmpty || firstNonEmpty == -1U) && "Expect at most one partially "
"applied that is passed as an "
"ABI argument");
if (!isEmpty)
firstNonEmpty = paramIdx;
}
assert(firstNonEmpty != -1U);
return firstNonEmpty;
}
/// Emit the forwarding stub function for a partial application.
///
/// If 'layout' is null, there is a single captured value of
/// Swift-refcountable type that is being used directly as the
/// context object.
static llvm::Function *emitPartialApplicationForwarder(IRGenModule &IGM,
const Optional<FunctionPointer> &staticFnPtr,
bool calleeHasContext,
const Signature &origSig,
CanSILFunctionType origType,
CanSILFunctionType substType,
CanSILFunctionType outType,
SubstitutionMap subs,
HeapLayout const *layout,
ArrayRef<ParameterConvention> conventions) {
auto outSig = IGM.getSignature(outType);
llvm::AttributeList outAttrs = outSig.getAttributes();
llvm::FunctionType *fwdTy = outSig.getType();
SILFunctionConventions outConv(outType, IGM.getSILModule());
StringRef FnName;
if (staticFnPtr)
FnName = staticFnPtr->getPointer()->getName();
IRGenMangler Mangler;
std::string thunkName = Mangler.manglePartialApplyForwarder(FnName);
// FIXME: Maybe cache the thunk by function and closure types?.
llvm::Function *fwd =
llvm::Function::Create(fwdTy, llvm::Function::InternalLinkage,
llvm::StringRef(thunkName), &IGM.Module);
fwd->setCallingConv(outSig.getCallingConv());
fwd->setAttributes(outAttrs);
// Merge initial attributes with outAttrs.
llvm::AttrBuilder b;
IGM.constructInitialFnAttributes(b);
fwd->addAttributes(llvm::AttributeList::FunctionIndex, b);
IRGenFunction subIGF(IGM, fwd);
if (IGM.DebugInfo)
IGM.DebugInfo->emitArtificialFunction(subIGF, fwd);
Explosion origParams = subIGF.collectParameters();
// Create a new explosion for potentially reabstracted parameters.
Explosion args;
Address resultValueAddr;
{
// Lower the forwarded arguments in the original function's generic context.
GenericContextScope scope(IGM, origType->getGenericSignature());
SILFunctionConventions origConv(origType, IGM.getSILModule());
auto &outResultTI = IGM.getTypeInfo(outConv.getSILResultType());
auto &nativeResultSchema = outResultTI.nativeReturnValueSchema(IGM);
auto &origResultTI = IGM.getTypeInfo(origConv.getSILResultType());
auto &origNativeSchema = origResultTI.nativeReturnValueSchema(IGM);
// Forward the indirect return values. We might have to reabstract the
// return value.
if (nativeResultSchema.requiresIndirect()) {
assert(origNativeSchema.requiresIndirect());
auto resultAddr = origParams.claimNext();
resultAddr = subIGF.Builder.CreateBitCast(
resultAddr, IGM.getStoragePointerType(origConv.getSILResultType()));
args.add(resultAddr);
} else if (origNativeSchema.requiresIndirect()) {
assert(!nativeResultSchema.requiresIndirect());
auto stackAddr = outResultTI.allocateStack(
subIGF, outConv.getSILResultType(), "return.temp");
resultValueAddr = stackAddr.getAddress();
auto resultAddr = subIGF.Builder.CreateBitCast(
resultValueAddr,
IGM.getStoragePointerType(origConv.getSILResultType()));
args.add(resultAddr.getAddress());
}
for (auto resultType : origConv.getIndirectSILResultTypes()) {
auto addr = origParams.claimNext();
addr = subIGF.Builder.CreateBitCast(
addr, IGM.getStoragePointerType(resultType));
args.add(addr);
}
// Reemit the parameters as unsubstituted.
for (unsigned i = 0; i < outType->getParameters().size(); ++i) {
auto origParamInfo = origType->getParameters()[i];
auto &ti = IGM.getTypeInfoForLowered(origParamInfo.getType());
auto schema = ti.getSchema();
auto origParamSILType = IGM.silConv.getSILType(origParamInfo);
// Forward the address of indirect value params.
auto &nativeSchemaOrigParam = ti.nativeParameterValueSchema(IGM);
bool isIndirectParam = origConv.isSILIndirect(origParamInfo);
if (!isIndirectParam && nativeSchemaOrigParam.requiresIndirect()) {
auto addr = origParams.claimNext();
if (addr->getType() != ti.getStorageType()->getPointerTo())
addr = subIGF.Builder.CreateBitCast(addr,
ti.getStorageType()->getPointerTo());
args.add(addr);
continue;
}
auto outTypeParamInfo = outType->getParameters()[i];
// Indirect parameters need no mapping through the native calling
// convention.
if (isIndirectParam) {
emitApplyArgument(subIGF, origParamInfo, outTypeParamInfo, origParams,
args);
continue;
}
// Map from the native calling convention into the explosion schema.
auto outTypeParamSILType = IGM.silConv.getSILType(origParamInfo);
auto &nativeSchemaOutTypeParam =
IGM.getTypeInfo(outTypeParamSILType).nativeParameterValueSchema(IGM);
Explosion nativeParam;
origParams.transferInto(nativeParam, nativeSchemaOutTypeParam.size());
bindPolymorphicParameter(subIGF, origType, substType, nativeParam, i);
Explosion nonNativeParam = nativeSchemaOutTypeParam.mapFromNative(
subIGF.IGM, subIGF, nativeParam, outTypeParamSILType);
assert(nativeParam.empty());
// Emit unsubstituted argument for call.
Explosion nonNativeApplyArg;
emitApplyArgument(subIGF, origParamInfo, outTypeParamInfo, nonNativeParam,
nonNativeApplyArg);
assert(nonNativeParam.empty());
// Map back from the explosion scheme to the native calling convention for
// the call.
Explosion nativeApplyArg = nativeSchemaOrigParam.mapIntoNative(
subIGF.IGM, subIGF, nonNativeApplyArg, origParamSILType, false);
assert(nonNativeApplyArg.empty());
nativeApplyArg.transferInto(args, nativeApplyArg.size());
}
}
struct AddressToDeallocate {
SILType Type;
const TypeInfo &TI;
StackAddress Addr;
};
SmallVector<AddressToDeallocate, 4> addressesToDeallocate;
bool dependsOnContextLifetime = false;
bool consumesContext;
bool needsAllocas = false;
switch (outType->getCalleeConvention()) {
case ParameterConvention::Direct_Owned:
consumesContext = true;
break;
case ParameterConvention::Direct_Unowned:
case ParameterConvention::Direct_Guaranteed:
consumesContext = false;
break;
case ParameterConvention::Indirect_Inout:
case ParameterConvention::Indirect_InoutAliasable:
case ParameterConvention::Indirect_In:
case ParameterConvention::Indirect_In_Constant:
case ParameterConvention::Indirect_In_Guaranteed:
llvm_unreachable("indirect callables not supported");
}
// Lower the captured arguments in the original function's generic context.
GenericContextScope scope(IGM, origType->getGenericSignature());
// This is where the context parameter appears.
llvm::Value *rawData = nullptr;
Address data;
unsigned nextCapturedField = 0;
if (!layout) {
rawData = origParams.claimNext();
} else if (!layout->isKnownEmpty()) {
rawData = origParams.claimNext();
data = layout->emitCastTo(subIGF, rawData);
// Restore type metadata bindings, if we have them.
if (layout->hasBindings()) {
auto bindingLayout = layout->getElement(nextCapturedField++);
// The bindings should be fixed-layout inside the object, so we can
// pass None here. If they weren't, we'd have a chicken-egg problem.
auto bindingsAddr = bindingLayout.project(subIGF, data, /*offsets*/ None);
layout->getBindings().restore(subIGF, bindingsAddr,
MetadataState::Complete);
}
// There's still a placeholder to claim if the target type is thick
// or there's an error result.
} else if (outType->getRepresentation()==SILFunctionTypeRepresentation::Thick
|| outType->hasErrorResult()) {
llvm::Value *contextPtr = origParams.claimNext(); (void)contextPtr;
assert(contextPtr->getType() == IGM.RefCountedPtrTy);
}
Explosion polyArgs;
// Emit the polymorphic arguments.
assert((subs.hasAnySubstitutableParams()
== hasPolymorphicParameters(origType) ||
(!subs.hasAnySubstitutableParams() && origType->getRepresentation() ==
SILFunctionTypeRepresentation::WitnessMethod))
&& "should have substitutions iff original function is generic");
WitnessMetadata witnessMetadata;
// If we have a layout we might have to bind polymorphic arguments from the
// captured arguments which we will do later. Otherwise, we have to
// potentially bind polymorphic arguments from the context if it was a
// partially applied argument.
bool hasPolymorphicParams = hasPolymorphicParameters(origType);
if (!layout && hasPolymorphicParams) {
assert(conventions.size() == 1);
// We could have either partially applied an argument from the function
// signature or otherwise we could have a closure context to forward. We only
// care for the former for the purpose of reconstructing polymorphic
// parameters from regular arguments.
if (!calleeHasContext) {
unsigned paramI =
findSinglePartiallyAppliedParameterIndexIgnoringEmptyTypes(
subIGF, substType, outType);
auto paramInfo = substType->getParameters()[paramI];
auto &ti = IGM.getTypeInfoForLowered(paramInfo.getType());
Explosion param;
auto ref = rawData;
// We can get a '{ swift.refcounted* }' type for AnyObject on linux.
if (!ti.getStorageType()->isPointerTy() &&
ti.isSingleSwiftRetainablePointer(ResilienceExpansion::Maximal))
ref = subIGF.coerceValue(rawData, ti.getStorageType(),
subIGF.IGM.DataLayout);
else
ref = subIGF.Builder.CreateBitCast(rawData, ti.getStorageType());
param.add(ref);
bindPolymorphicParameter(subIGF, origType, substType, param, paramI);
(void)param.claimAll();
}
emitPolymorphicArguments(subIGF, origType, subs,
&witnessMetadata, polyArgs);
}
auto haveContextArgument =
calleeHasContext || hasSelfContextParameter(origType);
// Witness method calls expect self, followed by the self type followed by,
// the witness table at the end of the parameter list. But polymorphic
// arguments come before this.
bool isWitnessMethodCallee = origType->getRepresentation() ==
SILFunctionTypeRepresentation::WitnessMethod;
Explosion witnessMethodSelfValue;
// If there's a data pointer required, but it's a swift-retainable
// value being passed as the context, just forward it down.