static void emitCaptureArguments(SILGenFunction &SGF,
AnyFunctionRef closure,
CapturedValue capture,
uint16_t ArgNo) {
auto *VD = capture.getDecl();
SILLocation Loc(VD);
Loc.markAsPrologue();
// Local function to get the captured variable type within the capturing
// context.
auto getVarTypeInCaptureContext = [&]() -> Type {
auto interfaceType = VD->getInterfaceType();
return GenericEnvironment::mapTypeIntoContext(
closure.getGenericEnvironment(), interfaceType);
};
// FIXME: Expansion
auto expansion = ResilienceExpansion::Minimal;
switch (SGF.SGM.Types.getDeclCaptureKind(capture, expansion)) {
case CaptureKind::None:
break;
case CaptureKind::Constant: {
auto type = getVarTypeInCaptureContext();
auto &lowering = SGF.getTypeLowering(type);
// Constant decls are captured by value.
SILType ty = lowering.getLoweredType();
SILValue val = SGF.F.begin()->createFunctionArgument(ty, VD);
bool NeedToDestroyValueAtExit = false;
// If the original variable was settable, then Sema will have treated the
// VarDecl as an lvalue, even in the closure's use. As such, we need to
// allow formation of the address for this captured value. Create a
// temporary within the closure to provide this address.
if (VD->isSettable(VD->getDeclContext())) {
auto addr = SGF.emitTemporaryAllocation(VD, ty);
// We have created a copy that needs to be destroyed.
val = SGF.B.emitCopyValueOperation(Loc, val);
NeedToDestroyValueAtExit = true;
lowering.emitStore(SGF.B, VD, val, addr, StoreOwnershipQualifier::Init);
val = addr;
}
SGF.VarLocs[VD] = SILGenFunction::VarLoc::get(val);
if (auto *AllocStack = dyn_cast<AllocStackInst>(val))
AllocStack->setArgNo(ArgNo);
else {
SILDebugVariable DbgVar(/*Constant*/ true, ArgNo);
SGF.B.createDebugValue(Loc, val, DbgVar);
}
// TODO: Closure contexts should always be guaranteed.
if (NeedToDestroyValueAtExit && !lowering.isTrivial())
SGF.enterDestroyCleanup(val);
break;
}
case CaptureKind::Box: {
// LValues are captured as a retained @box that owns
// the captured value.
auto type = getVarTypeInCaptureContext();
auto boxTy = SGF.SGM.Types.getContextBoxTypeForCapture(VD,
SGF.SGM.Types.getLoweredRValueType(type),
SGF.F.getGenericEnvironment(), /*mutable*/ true);
SILValue box = SGF.F.begin()->createFunctionArgument(
SILType::getPrimitiveObjectType(boxTy), VD);
SILValue addr = SGF.B.createProjectBox(VD, box, 0);
SGF.VarLocs[VD] = SILGenFunction::VarLoc::get(addr, box);
SILDebugVariable DbgVar(/*Constant*/ false, ArgNo);
SGF.B.createDebugValueAddr(Loc, addr, DbgVar);
break;
}
case CaptureKind::StorageAddress: {
// Non-escaping stored decls are captured as the address of the value.
auto type = getVarTypeInCaptureContext();
SILType ty = SGF.getLoweredType(type).getAddressType();
SILValue addr = SGF.F.begin()->createFunctionArgument(ty, VD);
SGF.VarLocs[VD] = SILGenFunction::VarLoc::get(addr);
SILDebugVariable DbgVar(/*Constant*/ true, ArgNo);
SGF.B.createDebugValueAddr(Loc, addr, DbgVar);
break;
}
}
}
static void emitCaptureArguments(SILGenFunction &gen,
AnyFunctionRef closure,
CapturedValue capture,
unsigned ArgNo) {
auto *VD = capture.getDecl();
SILLocation Loc(VD);
Loc.markAsPrologue();
// Local function to get the captured variable type within the capturing
// context.
auto getVarTypeInCaptureContext = [&]() -> Type {
auto interfaceType = VD->getInterfaceType();
return GenericEnvironment::mapTypeIntoContext(
closure.getGenericEnvironment(), interfaceType);
};
switch (gen.SGM.Types.getDeclCaptureKind(capture)) {
case CaptureKind::None:
break;
case CaptureKind::Constant: {
auto type = getVarTypeInCaptureContext();
auto &lowering = gen.getTypeLowering(type);
// Constant decls are captured by value.
SILType ty = lowering.getLoweredType();
SILValue val = gen.F.begin()->createFunctionArgument(ty, VD);
// If the original variable was settable, then Sema will have treated the
// VarDecl as an lvalue, even in the closure's use. As such, we need to
// allow formation of the address for this captured value. Create a
// temporary within the closure to provide this address.
if (VD->isSettable(VD->getDeclContext())) {
auto addr = gen.emitTemporaryAllocation(VD, ty);
lowering.emitStore(gen.B, VD, val, addr, StoreOwnershipQualifier::Init);
val = addr;
}
gen.VarLocs[VD] = SILGenFunction::VarLoc::get(val);
if (auto *AllocStack = dyn_cast<AllocStackInst>(val))
AllocStack->setArgNo(ArgNo);
else
gen.B.createDebugValue(Loc, val, {/*Constant*/true, ArgNo});
// TODO: Closure contexts should always be guaranteed.
if (!gen.SGM.M.getOptions().EnableGuaranteedClosureContexts
&& !lowering.isTrivial())
gen.enterDestroyCleanup(val);
break;
}
case CaptureKind::Box: {
// LValues are captured as a retained @box that owns
// the captured value.
auto type = getVarTypeInCaptureContext();
auto boxTy = gen.SGM.Types.getContextBoxTypeForCapture(VD,
gen.getLoweredType(type).getSwiftRValueType(),
gen.F.getGenericEnvironment(), /*mutable*/ true);
SILValue box = gen.F.begin()->createFunctionArgument(
SILType::getPrimitiveObjectType(boxTy), VD);
SILValue addr = gen.B.createProjectBox(VD, box, 0);
gen.VarLocs[VD] = SILGenFunction::VarLoc::get(addr, box);
gen.B.createDebugValueAddr(Loc, addr, {/*Constant*/false, ArgNo});
if (!gen.SGM.M.getOptions().EnableGuaranteedClosureContexts)
gen.Cleanups.pushCleanup<StrongReleaseCleanup>(box);
break;
}
case CaptureKind::StorageAddress: {
// Non-escaping stored decls are captured as the address of the value.
auto type = getVarTypeInCaptureContext();
SILType ty = gen.getLoweredType(type).getAddressType();
SILValue addr = gen.F.begin()->createFunctionArgument(ty, VD);
gen.VarLocs[VD] = SILGenFunction::VarLoc::get(addr);
gen.B.createDebugValueAddr(Loc, addr, {/*Constant*/true, ArgNo});
break;
}
}
}