mirror of
https://github.com/apple/swift.git
synced 2026-02-27 18:26:24 +01:00
d3b6b89de6
`DifferentiableFunctionInst` now stores result indices. `SILAutoDiffIndices` now stores result indices instead of a source index. `@differentiable` SIL function types may now have multiple differentiability result indices and `@noDerivative` resutls. `@differentiable` AST function types do not have `@noDerivative` results (yet), so this functionality is not exposed to users. Resolves TF-689 and TF-1256. Infrastructural support for TF-983: supporting differentiation of `apply` instructions with multiple active semantic results.
233 lines
9.5 KiB
C++
233 lines
9.5 KiB
C++
//===--- SILGenThunk.cpp - SILGen for thunks ------------------------------===//
|
|
//
|
|
// 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 contains code for emitting various types of thunks that can be
|
|
// referenced from code, such as dynamic thunks, curry thunks, native to foreign
|
|
// thunks and foreign to native thunks.
|
|
//
|
|
// VTable thunks and witness thunks can be found in SILGenType.cpp, and the
|
|
// meat of the bridging thunk implementation is in SILGenBridging.cpp, and
|
|
// re-abstraction thunks are in SILGenPoly.cpp.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "ManagedValue.h"
|
|
#include "SILGenFunction.h"
|
|
#include "SILGenFunctionBuilder.h"
|
|
#include "Scope.h"
|
|
#include "swift/AST/ASTMangler.h"
|
|
#include "swift/AST/DiagnosticsSIL.h"
|
|
#include "swift/AST/FileUnit.h"
|
|
#include "swift/AST/GenericEnvironment.h"
|
|
#include "swift/SIL/PrettyStackTrace.h"
|
|
#include "swift/SIL/SILArgument.h"
|
|
#include "swift/SIL/TypeLowering.h"
|
|
|
|
using namespace swift;
|
|
using namespace Lowering;
|
|
|
|
SILValue SILGenFunction::emitClassMethodRef(SILLocation loc,
|
|
SILValue selfPtr,
|
|
SILDeclRef constant,
|
|
CanSILFunctionType constantTy) {
|
|
assert(!constant.isForeign);
|
|
return B.createClassMethod(loc, selfPtr, constant,
|
|
SILType::getPrimitiveObjectType(constantTy));
|
|
}
|
|
|
|
SILFunction *SILGenModule::getDynamicThunk(SILDeclRef constant,
|
|
CanSILFunctionType constantTy) {
|
|
assert(constant.kind != SILDeclRef::Kind::Allocator &&
|
|
"allocating entry point for constructor is never dynamic");
|
|
// Mangle the constant with a TD suffix.
|
|
auto nameTmp = constant.mangle(SILDeclRef::ManglingKind::DynamicThunk);
|
|
auto name = M.allocateCopy(nameTmp);
|
|
|
|
SILGenFunctionBuilder builder(*this);
|
|
auto F = builder.getOrCreateFunction(
|
|
constant.getDecl(), name, SILLinkage::Shared, constantTy, IsBare,
|
|
IsTransparent, IsSerializable, IsNotDynamic, ProfileCounter(), IsThunk);
|
|
|
|
if (F->empty()) {
|
|
// Emit the thunk if we haven't yet.
|
|
// Currently a dynamic thunk looks just like a foreign-to-native thunk around
|
|
// an ObjC method. This would change if we introduced a native
|
|
// runtime-hookable mechanism.
|
|
SILGenFunction SGF(*this, *F, SwiftModule);
|
|
SGF.emitForeignToNativeThunk(constant);
|
|
emitLazyConformancesForFunction(F);
|
|
}
|
|
|
|
return F;
|
|
}
|
|
|
|
ManagedValue
|
|
SILGenFunction::emitDynamicMethodRef(SILLocation loc, SILDeclRef constant,
|
|
CanSILFunctionType constantTy) {
|
|
// If the method is foreign, its foreign thunk will handle the dynamic
|
|
// dispatch for us.
|
|
if (constant.isForeignToNativeThunk()) {
|
|
if (!SGM.hasFunction(constant))
|
|
SGM.emitForeignToNativeThunk(constant);
|
|
return ManagedValue::forUnmanaged(B.createFunctionRefFor(
|
|
loc, SGM.getFunction(constant, NotForDefinition)));
|
|
}
|
|
|
|
// Otherwise, we need a dynamic dispatch thunk.
|
|
SILFunction *F = SGM.getDynamicThunk(constant, constantTy);
|
|
|
|
return ManagedValue::forUnmanaged(B.createFunctionRefFor(loc, F));
|
|
}
|
|
|
|
void SILGenModule::emitForeignToNativeThunk(SILDeclRef thunk) {
|
|
// Thunks are always emitted by need, so don't need delayed emission.
|
|
assert(!thunk.isForeign && "foreign-to-native thunks only");
|
|
SILFunction *f = getFunction(thunk, ForDefinition);
|
|
f->setThunk(IsThunk);
|
|
if (thunk.asForeign().isClangGenerated())
|
|
f->setSerialized(IsSerializable);
|
|
preEmitFunction(thunk, thunk.getDecl(), f, thunk.getDecl());
|
|
PrettyStackTraceSILFunction X("silgen emitForeignToNativeThunk", f);
|
|
SILGenFunction(*this, *f, SwiftModule).emitForeignToNativeThunk(thunk);
|
|
postEmitFunction(thunk, f);
|
|
}
|
|
|
|
void SILGenModule::emitNativeToForeignThunk(SILDeclRef thunk) {
|
|
// Thunks are always emitted by need, so don't need delayed emission.
|
|
assert(thunk.isForeign && "native-to-foreign thunks only");
|
|
|
|
SILFunction *f = getFunction(thunk, ForDefinition);
|
|
if (thunk.hasDecl())
|
|
preEmitFunction(thunk, thunk.getDecl(), f, thunk.getDecl());
|
|
else
|
|
preEmitFunction(thunk, thunk.getAbstractClosureExpr(), f,
|
|
thunk.getAbstractClosureExpr());
|
|
PrettyStackTraceSILFunction X("silgen emitNativeToForeignThunk", f);
|
|
f->setBare(IsBare);
|
|
f->setThunk(IsThunk);
|
|
SILGenFunction(*this, *f, SwiftModule).emitNativeToForeignThunk(thunk);
|
|
postEmitFunction(thunk, f);
|
|
}
|
|
|
|
SILValue
|
|
SILGenFunction::emitGlobalFunctionRef(SILLocation loc, SILDeclRef constant,
|
|
SILConstantInfo constantInfo,
|
|
bool callPreviousDynamicReplaceableImpl) {
|
|
assert(constantInfo == getConstantInfo(getTypeExpansionContext(), constant));
|
|
|
|
// Builtins must be fully applied at the point of reference.
|
|
if (constant.hasDecl() &&
|
|
isa<BuiltinUnit>(constant.getDecl()->getDeclContext())) {
|
|
SGM.diagnose(loc.getSourceLoc(), diag::not_implemented,
|
|
"delayed application of builtin");
|
|
return SILUndef::get(constantInfo.getSILType(), F);
|
|
}
|
|
|
|
// If the constant is a thunk we haven't emitted yet, emit it.
|
|
if (!SGM.hasFunction(constant)) {
|
|
if (constant.isForeignToNativeThunk()) {
|
|
SGM.emitForeignToNativeThunk(constant);
|
|
} else if (constant.isNativeToForeignThunk()) {
|
|
SGM.emitNativeToForeignThunk(constant);
|
|
}
|
|
}
|
|
|
|
auto f = SGM.getFunction(constant, NotForDefinition);
|
|
assert(f->getLoweredFunctionTypeInContext(B.getTypeExpansionContext()) ==
|
|
constantInfo.SILFnType);
|
|
if (callPreviousDynamicReplaceableImpl)
|
|
return B.createPreviousDynamicFunctionRef(loc, f);
|
|
else
|
|
return B.createFunctionRefFor(loc, f);
|
|
}
|
|
|
|
SILFunction *SILGenModule::
|
|
getOrCreateReabstractionThunk(CanSILFunctionType thunkType,
|
|
CanSILFunctionType fromType,
|
|
CanSILFunctionType toType,
|
|
CanType dynamicSelfType) {
|
|
// The reference to the thunk is likely @noescape, but declarations are always
|
|
// escaping.
|
|
auto thunkDeclType =
|
|
thunkType->getWithExtInfo(thunkType->getExtInfo().withNoEscape(false));
|
|
|
|
// Mangle the reabstraction thunk.
|
|
// Substitute context parameters out of the "from" and "to" types.
|
|
auto fromInterfaceType = fromType->mapTypeOutOfContext()
|
|
->getCanonicalType();
|
|
auto toInterfaceType = toType->mapTypeOutOfContext()
|
|
->getCanonicalType();
|
|
CanType dynamicSelfInterfaceType;
|
|
if (dynamicSelfType)
|
|
dynamicSelfInterfaceType = dynamicSelfType->mapTypeOutOfContext()
|
|
->getCanonicalType();
|
|
|
|
Mangle::ASTMangler NewMangler;
|
|
std::string name = NewMangler.mangleReabstractionThunkHelper(thunkType,
|
|
fromInterfaceType, toInterfaceType,
|
|
dynamicSelfInterfaceType,
|
|
M.getSwiftModule());
|
|
|
|
auto loc = RegularLocation::getAutoGeneratedLocation();
|
|
|
|
SILGenFunctionBuilder builder(*this);
|
|
return builder.getOrCreateSharedFunction(
|
|
loc, name, thunkDeclType, IsBare, IsTransparent, IsSerializable,
|
|
ProfileCounter(), IsReabstractionThunk, IsNotDynamic);
|
|
}
|
|
|
|
SILFunction *SILGenModule::getOrCreateAutoDiffClassMethodThunk(
|
|
SILDeclRef derivativeFnDeclRef, CanSILFunctionType constantTy) {
|
|
auto *derivativeId = derivativeFnDeclRef.derivativeFunctionIdentifier;
|
|
assert(derivativeId);
|
|
auto *derivativeFnDecl = derivativeFnDeclRef.getDecl();
|
|
|
|
SILGenFunctionBuilder builder(*this);
|
|
auto originalFnDeclRef = derivativeFnDeclRef.asAutoDiffOriginalFunction();
|
|
// TODO(TF-685): Use principled thunk mangling.
|
|
// Do not simply reuse reabstraction thunk mangling.
|
|
auto name = derivativeFnDeclRef.mangle() + "_vtable_entry_thunk";
|
|
auto *thunk = builder.getOrCreateFunction(
|
|
derivativeFnDecl, name, originalFnDeclRef.getLinkage(ForDefinition),
|
|
constantTy, IsBare, IsTransparent, derivativeFnDeclRef.isSerialized(),
|
|
IsNotDynamic, ProfileCounter(), IsThunk);
|
|
if (!thunk->empty())
|
|
return thunk;
|
|
|
|
if (auto genSig = constantTy->getSubstGenericSignature())
|
|
thunk->setGenericEnvironment(genSig->getGenericEnvironment());
|
|
SILGenFunction SGF(*this, *thunk, SwiftModule);
|
|
SmallVector<ManagedValue, 4> params;
|
|
auto loc = derivativeFnDeclRef.getAsRegularLocation();
|
|
SGF.collectThunkParams(loc, params);
|
|
|
|
auto originalFn = SGF.emitGlobalFunctionRef(loc, originalFnDeclRef);
|
|
auto *loweredParamIndices = autodiff::getLoweredParameterIndices(
|
|
derivativeId->getParameterIndices(),
|
|
derivativeFnDecl->getInterfaceType()->castTo<AnyFunctionType>());
|
|
auto *loweredResultIndices = IndexSubset::get(getASTContext(), 1, {0});
|
|
auto diffFn = SGF.B.createDifferentiableFunction(
|
|
loc, loweredParamIndices, loweredResultIndices, originalFn);
|
|
auto derivativeFn = SGF.B.createDifferentiableFunctionExtract(
|
|
loc, NormalDifferentiableFunctionTypeComponent(derivativeId->getKind()),
|
|
diffFn);
|
|
auto derivativeFnSILTy = SILType::getPrimitiveObjectType(constantTy);
|
|
SmallVector<SILValue, 4> args(thunk->getArguments().begin(),
|
|
thunk->getArguments().end());
|
|
auto apply =
|
|
SGF.emitApplyWithRethrow(loc, derivativeFn, derivativeFnSILTy,
|
|
SGF.getForwardingSubstitutionMap(), args);
|
|
SGF.B.createReturn(loc, apply);
|
|
|
|
return thunk;
|
|
}
|