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SILGenBuiltin.cpp
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//===--- SILGenBuiltin.cpp - SIL generation for builtin call sites -------===//
//
// 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 "SpecializedEmitter.h"
#include "ArgumentSource.h"
#include "Cleanup.h"
#include "Initialization.h"
#include "LValue.h"
#include "RValue.h"
#include "Scope.h"
#include "SILGenFunction.h"
#include "swift/AST/ASTContext.h"
#include "swift/AST/Builtins.h"
#include "swift/AST/DiagnosticsSIL.h"
#include "swift/AST/FileUnit.h"
#include "swift/AST/GenericEnvironment.h"
#include "swift/AST/Module.h"
#include "swift/AST/ProtocolConformance.h"
#include "swift/AST/ReferenceCounting.h"
#include "swift/SIL/SILArgument.h"
#include "swift/SIL/SILUndef.h"
#include "swift/AST/TypeCheckRequests.h" // FIXME: Temporary
#include "swift/AST/NameLookupRequests.h" // FIXME: Temporary
using namespace swift;
using namespace Lowering;
/// Break down an expression that's the formal argument expression to
/// a builtin function, returning its individualized arguments.
///
/// Because these are builtin operations, we can make some structural
/// assumptions about the expression used to call them.
static llvm::Optional<SmallVector<Expr *, 2>>
decomposeArguments(SILGenFunction &SGF, SILLocation loc,
PreparedArguments &&args, unsigned expectedCount) {
SmallVector<Expr*, 2> result;
auto sources = std::move(args).getSources();
if (sources.size() == expectedCount) {
for (auto &&source : sources)
result.push_back(std::move(source).asKnownExpr());
return result;
}
SGF.SGM.diagnose(loc, diag::invalid_sil_builtin,
"argument to builtin should be a literal tuple");
return llvm::None;
}
static ManagedValue emitBuiltinRetain(SILGenFunction &SGF,
SILLocation loc,
SubstitutionMap substitutions,
ArrayRef<ManagedValue> args,
SGFContext C) {
// The value was produced at +1; we can produce an unbalanced retain simply by
// disabling the cleanup. But this would violate ownership semantics. Instead,
// we must allow for the cleanup and emit a new unmanaged retain value.
SGF.B.createUnmanagedRetainValue(loc, args[0].getValue(),
SGF.B.getDefaultAtomicity());
return ManagedValue::forObjectRValueWithoutOwnership(SGF.emitEmptyTuple(loc));
}
static ManagedValue emitBuiltinRelease(SILGenFunction &SGF,
SILLocation loc,
SubstitutionMap substitutions,
ArrayRef<ManagedValue> args,
SGFContext C) {
// The value was produced at +1, so to produce an unbalanced
// release we need to leave the cleanup intact and then do a *second*
// release.
SGF.B.createUnmanagedReleaseValue(loc, args[0].getValue(),
SGF.B.getDefaultAtomicity());
return ManagedValue::forObjectRValueWithoutOwnership(SGF.emitEmptyTuple(loc));
}
static ManagedValue emitBuiltinAutorelease(SILGenFunction &SGF,
SILLocation loc,
SubstitutionMap substitutions,
ArrayRef<ManagedValue> args,
SGFContext C) {
SGF.B.createUnmanagedAutoreleaseValue(loc, args[0].getValue(),
SGF.B.getDefaultAtomicity());
return ManagedValue::forObjectRValueWithoutOwnership(SGF.emitEmptyTuple(loc));
}
/// Specialized emitter for Builtin.load and Builtin.take.
static ManagedValue emitBuiltinLoadOrTake(SILGenFunction &SGF,
SILLocation loc,
SubstitutionMap substitutions,
ArrayRef<ManagedValue> args,
SGFContext C,
IsTake_t isTake,
bool isStrict,
bool isInvariant,
llvm::MaybeAlign align) {
assert(substitutions.getReplacementTypes().size() == 1 &&
"load should have single substitution");
assert(args.size() == 1 && "load should have a single argument");
// The substitution gives the type of the load. This is always a
// first-class type; there is no way to e.g. produce a @weak load
// with this builtin.
auto &rvalueTL = SGF.getTypeLowering(substitutions.getReplacementTypes()[0]);
SILType loadedType = rvalueTL.getLoweredType();
// Convert the pointer argument to a SIL address.
//
// Default to an unaligned pointer. This can be optimized in the presence of
// Builtin.assumeAlignment.
SILValue addr = SGF.B.createPointerToAddress(loc, args[0].getUnmanagedValue(),
loadedType.getAddressType(),
isStrict, isInvariant, align);
// Perform the load.
return SGF.emitLoad(loc, addr, rvalueTL, C, isTake);
}
static ManagedValue emitBuiltinLoad(SILGenFunction &SGF,
SILLocation loc,
SubstitutionMap substitutions,
ArrayRef<ManagedValue> args,
SGFContext C) {
// Regular loads assume natural alignment.
return emitBuiltinLoadOrTake(SGF, loc, substitutions, args,
C, IsNotTake,
/*isStrict*/ true, /*isInvariant*/ false,
llvm::MaybeAlign());
}
static ManagedValue emitBuiltinLoadRaw(SILGenFunction &SGF,
SILLocation loc,
SubstitutionMap substitutions,
ArrayRef<ManagedValue> args,
SGFContext C) {
// Raw loads cannot assume alignment.
return emitBuiltinLoadOrTake(SGF, loc, substitutions, args,
C, IsNotTake,
/*isStrict*/ false, /*isInvariant*/ false,
llvm::MaybeAlign(1));
}
static ManagedValue emitBuiltinLoadInvariant(SILGenFunction &SGF,
SILLocation loc,
SubstitutionMap substitutions,
ArrayRef<ManagedValue> args,
SGFContext C) {
// Regular loads assume natural alignment.
return emitBuiltinLoadOrTake(SGF, loc, substitutions, args,
C, IsNotTake,
/*isStrict*/ false, /*isInvariant*/ true,
llvm::MaybeAlign());
}
static ManagedValue emitBuiltinTake(SILGenFunction &SGF,
SILLocation loc,
SubstitutionMap substitutions,
ArrayRef<ManagedValue> args,
SGFContext C) {
// Regular loads assume natural alignment.
return emitBuiltinLoadOrTake(SGF, loc, substitutions, args,
C, IsTake,
/*isStrict*/ true, /*isInvariant*/ false,
llvm::MaybeAlign());
}
/// Specialized emitter for Builtin.destroy.
static ManagedValue emitBuiltinDestroy(SILGenFunction &SGF,
SILLocation loc,
SubstitutionMap substitutions,
ArrayRef<ManagedValue> args,
SGFContext C) {
assert(args.size() == 2 && "destroy should have two arguments");
assert(substitutions.getReplacementTypes().size() == 1 &&
"destroy should have a single substitution");
// The substitution determines the type of the thing we're destroying.
auto &ti = SGF.getTypeLowering(substitutions.getReplacementTypes()[0]);
// Destroy is a no-op for trivial types.
if (ti.isTrivial())
return ManagedValue::forObjectRValueWithoutOwnership(
SGF.emitEmptyTuple(loc));
SILType destroyType = ti.getLoweredType();
// Convert the pointer argument to a SIL address.
SILValue addr =
SGF.B.createPointerToAddress(loc, args[1].getUnmanagedValue(),
destroyType.getAddressType(),
/*isStrict*/ true,
/*isInvariant*/ false);
// Destroy the value indirectly. Canonicalization will promote to loads
// and releases if appropriate.
SGF.B.createDestroyAddr(loc, addr);
return ManagedValue::forObjectRValueWithoutOwnership(SGF.emitEmptyTuple(loc));
}
static ManagedValue emitBuiltinAssign(SILGenFunction &SGF,
SILLocation loc,
SubstitutionMap substitutions,
ArrayRef<ManagedValue> args,
SGFContext C) {
assert(args.size() >= 2 && "assign should have two arguments");
assert(substitutions.getReplacementTypes().size() == 1 &&
"assign should have a single substitution");
// The substitution determines the type of the thing we're destroying.
CanType assignFormalType =
substitutions.getReplacementTypes()[0]->getCanonicalType();
SILType assignType = SGF.getLoweredType(assignFormalType);
// Convert the destination pointer argument to a SIL address.
SILValue addr = SGF.B.createPointerToAddress(loc,
args.back().getUnmanagedValue(),
assignType.getAddressType(),
/*isStrict*/ true,
/*isInvariant*/ false);
// Build the value to be assigned, reconstructing tuples if needed.
auto src = RValue(SGF, args.slice(0, args.size() - 1), assignFormalType);
std::move(src).ensurePlusOne(SGF, loc).assignInto(SGF, loc, addr);
return ManagedValue::forObjectRValueWithoutOwnership(SGF.emitEmptyTuple(loc));
}
/// Emit Builtin.initialize by evaluating the operand directly into
/// the address.
static ManagedValue emitBuiltinInit(SILGenFunction &SGF,
SILLocation loc,
SubstitutionMap substitutions,
PreparedArguments &&preparedArgs,
SGFContext C) {
auto argsOrError = decomposeArguments(SGF, loc, std::move(preparedArgs), 2);
if (!argsOrError)
return ManagedValue::forObjectRValueWithoutOwnership(
SGF.emitEmptyTuple(loc));
auto args = *argsOrError;
CanType formalType =
substitutions.getReplacementTypes()[0]->getCanonicalType();
auto &formalTL = SGF.getTypeLowering(formalType);
SILValue addr = SGF.emitRValueAsSingleValue(args[1]).getUnmanagedValue();
addr = SGF.B.createPointerToAddress(
loc, addr, formalTL.getLoweredType().getAddressType(),
/*isStrict*/ true,
/*isInvariant*/ false);
TemporaryInitialization init(addr, CleanupHandle::invalid());
SGF.emitExprInto(args[0], &init);
return ManagedValue::forObjectRValueWithoutOwnership(SGF.emitEmptyTuple(loc));
}
/// Specialized emitter for Builtin.fixLifetime.
static ManagedValue emitBuiltinFixLifetime(SILGenFunction &SGF,
SILLocation loc,
SubstitutionMap substitutions,
ArrayRef<ManagedValue> args,
SGFContext C) {
for (auto arg : args) {
SGF.B.createFixLifetime(loc, arg.getValue());
}
return ManagedValue::forObjectRValueWithoutOwnership(SGF.emitEmptyTuple(loc));
}
static ManagedValue emitCastToReferenceType(SILGenFunction &SGF,
SILLocation loc,
SubstitutionMap substitutions,
ArrayRef<ManagedValue> args,
SGFContext C,
SILType objPointerType) {
assert(args.size() == 1 && "cast should have a single argument");
assert(substitutions.getReplacementTypes().size() == 1 &&
"cast should have a type substitution");
// Bail if the source type is not a class reference of some kind.
Type argTy = substitutions.getReplacementTypes()[0];
if (!argTy->mayHaveSuperclass() && !argTy->isClassExistentialType()) {
SGF.SGM.diagnose(loc, diag::invalid_sil_builtin,
"castToNativeObject source must be a class");
return SGF.emitUndef(objPointerType);
}
// Grab the argument.
ManagedValue arg = args[0];
// If the argument is existential, open it.
if (argTy->isClassExistentialType()) {
auto openedTy =
OpenedArchetypeType::get(argTy->getCanonicalType(),
SGF.F.getGenericSignature());
SILType loweredOpenedTy = SGF.getLoweredLoadableType(openedTy);
arg = SGF.B.createOpenExistentialRef(loc, arg, loweredOpenedTy);
}
// Return the cast result.
return SGF.B.createUncheckedRefCast(loc, arg, objPointerType);
}
/// Specialized emitter for Builtin.unsafeCastToNativeObject.
static ManagedValue emitBuiltinUnsafeCastToNativeObject(SILGenFunction &SGF,
SILLocation loc,
SubstitutionMap substitutions,
ArrayRef<ManagedValue> args,
SGFContext C) {
return emitCastToReferenceType(SGF, loc, substitutions, args, C,
SILType::getNativeObjectType(SGF.F.getASTContext()));
}
/// Specialized emitter for Builtin.castToNativeObject.
static ManagedValue emitBuiltinCastToNativeObject(SILGenFunction &SGF,
SILLocation loc,
SubstitutionMap substitutions,
ArrayRef<ManagedValue> args,
SGFContext C) {
auto ty = args[0].getType().getASTType();
(void)ty;
assert(ty->getReferenceCounting() == ReferenceCounting::Native &&
"Can only cast types that use native reference counting to native "
"object");
return emitBuiltinUnsafeCastToNativeObject(SGF, loc, substitutions,
args, C);
}
static ManagedValue emitCastFromReferenceType(SILGenFunction &SGF,
SILLocation loc,
SubstitutionMap substitutions,
ArrayRef<ManagedValue> args,
SGFContext C) {
assert(args.size() == 1 && "cast should have a single argument");
assert(substitutions.getReplacementTypes().size() == 1 &&
"cast should have a single substitution");
// The substitution determines the destination type.
SILType destType =
SGF.getLoweredType(substitutions.getReplacementTypes()[0]);
// Bail if the source type is not a class reference of some kind.
if (!substitutions.getReplacementTypes()[0]->isBridgeableObjectType()
|| !destType.isObject()) {
SGF.SGM.diagnose(loc, diag::invalid_sil_builtin,
"castFromNativeObject dest must be an object type");
// Recover by propagating an undef result.
return SGF.emitUndef(destType);
}
return SGF.B.createUncheckedRefCast(loc, args[0], destType);
}
/// Specialized emitter for Builtin.castFromNativeObject.
static ManagedValue emitBuiltinCastFromNativeObject(SILGenFunction &SGF,
SILLocation loc,
SubstitutionMap substitutions,
ArrayRef<ManagedValue> args,
SGFContext C) {
return emitCastFromReferenceType(SGF, loc, substitutions, args, C);
}
/// Specialized emitter for Builtin.bridgeToRawPointer.
static ManagedValue emitBuiltinBridgeToRawPointer(SILGenFunction &SGF,
SILLocation loc,
SubstitutionMap substitutions,
ArrayRef<ManagedValue> args,
SGFContext C) {
assert(args.size() == 1 && "bridge should have a single argument");
// Take the reference type argument and cast it to RawPointer.
// RawPointers do not have ownership semantics, so the cleanup on the
// argument remains.
SILType rawPointerType = SILType::getRawPointerType(SGF.F.getASTContext());
SILValue result = SGF.B.createRefToRawPointer(loc, args[0].getValue(),
rawPointerType);
return ManagedValue::forObjectRValueWithoutOwnership(result);
}
/// Specialized emitter for Builtin.bridgeFromRawPointer.
static ManagedValue emitBuiltinBridgeFromRawPointer(SILGenFunction &SGF,
SILLocation loc,
SubstitutionMap substitutions,
ArrayRef<ManagedValue> args,
SGFContext C) {
assert(substitutions.getReplacementTypes().size() == 1 &&
"bridge should have a single substitution");
assert(args.size() == 1 && "bridge should have a single argument");
// The substitution determines the destination type.
// FIXME: Archetype destination type?
auto &destLowering =
SGF.getTypeLowering(substitutions.getReplacementTypes()[0]);
assert(destLowering.isLoadable());
SILType destType = destLowering.getLoweredType();
// Take the raw pointer argument and cast it to the destination type.
SILValue result = SGF.B.createRawPointerToRef(loc, args[0].getUnmanagedValue(),
destType);
// The result has ownership semantics, so retain it with a cleanup.
return SGF.emitManagedCopy(loc, result, destLowering);
}
static ManagedValue emitBuiltinAddressOfBuiltins(SILGenFunction &SGF,
SILLocation loc,
SubstitutionMap substitutions,
PreparedArguments &&preparedArgs,
SGFContext C, bool stackProtected) {
SILType rawPointerType = SILType::getRawPointerType(SGF.getASTContext());
auto argsOrError = decomposeArguments(SGF, loc, std::move(preparedArgs), 1);
if (!argsOrError)
return SGF.emitUndef(rawPointerType);
auto argument = (*argsOrError)[0];
// If the argument is inout, try forming its lvalue. This builtin only works
// if it's trivially physically projectable.
auto inout = cast<InOutExpr>(argument->getSemanticsProvidingExpr());
auto lv = SGF.emitLValue(inout->getSubExpr(), SGFAccessKind::ReadWrite);
if (!lv.isPhysical() || !lv.isLoadingPure()) {
SGF.SGM.diagnose(argument->getLoc(), diag::non_physical_addressof);
return SGF.emitUndef(rawPointerType);
}
auto addr = SGF.emitAddressOfLValue(argument, std::move(lv))
.getLValueAddress();
// Take the address argument and cast it to RawPointer.
SILValue result = SGF.B.createAddressToPointer(loc, addr, rawPointerType,
stackProtected);
return ManagedValue::forObjectRValueWithoutOwnership(result);
}
/// Specialized emitter for Builtin.addressof.
static ManagedValue emitBuiltinAddressOf(SILGenFunction &SGF,
SILLocation loc,
SubstitutionMap substitutions,
PreparedArguments &&preparedArgs,
SGFContext C) {
return emitBuiltinAddressOfBuiltins(SGF, loc, substitutions, std::move(preparedArgs), C,
/*stackProtected=*/ true);
}
static ManagedValue emitBuiltinUnprotectedAddressOf(SILGenFunction &SGF,
SILLocation loc,
SubstitutionMap substitutions,
PreparedArguments &&preparedArgs,
SGFContext C) {
return emitBuiltinAddressOfBuiltins(SGF, loc, substitutions, std::move(preparedArgs), C,
/*stackProtected=*/ false);
}
/// Specialized emitter for Builtin.addressOfBorrow.
static ManagedValue emitBuiltinAddressOfBorrowBuiltins(SILGenFunction &SGF,
SILLocation loc,
SubstitutionMap substitutions,
PreparedArguments &&preparedArgs,
SGFContext C, bool stackProtected) {
SILType rawPointerType = SILType::getRawPointerType(SGF.getASTContext());
auto argsOrError = decomposeArguments(SGF, loc, std::move(preparedArgs), 1);
if (!argsOrError)
return SGF.emitUndef(rawPointerType);
auto argument = (*argsOrError)[0];
SILValue addr;
// Try to borrow the argument at +0. We only support if it's
// naturally emitted borrowed in memory.
auto borrow = SGF.emitRValue(argument, SGFContext::AllowGuaranteedPlusZero)
.getAsSingleValue(SGF, argument);
if (!SGF.F.getConventions().useLoweredAddresses()) {
auto &context = SGF.getASTContext();
auto identifier =
stackProtected
? context.getIdentifier("addressOfBorrowOpaque")
: context.getIdentifier("unprotectedAddressOfBorrowOpaque");
auto builtin = SGF.B.createBuiltin(loc, identifier, rawPointerType,
substitutions, {borrow.getValue()});
return ManagedValue::forObjectRValueWithoutOwnership(builtin);
}
if (!borrow.isPlusZero() || !borrow.getType().isAddress()) {
SGF.SGM.diagnose(argument->getLoc(), diag::non_borrowed_indirect_addressof);
return SGF.emitUndef(rawPointerType);
}
addr = borrow.getValue();
// Take the address argument and cast it to RawPointer.
SILValue result = SGF.B.createAddressToPointer(loc, addr, rawPointerType,
stackProtected);
return ManagedValue::forObjectRValueWithoutOwnership(result);
}
/// Specialized emitter for Builtin.addressOfBorrow.
static ManagedValue emitBuiltinAddressOfBorrow(SILGenFunction &SGF,
SILLocation loc,
SubstitutionMap substitutions,
PreparedArguments &&preparedArgs,
SGFContext C) {
return emitBuiltinAddressOfBorrowBuiltins(SGF, loc, substitutions,
std::move(preparedArgs), C, /*stackProtected=*/ true);
}
/// Specialized emitter for Builtin.addressOfBorrow.
static ManagedValue emitBuiltinUnprotectedAddressOfBorrow(SILGenFunction &SGF,
SILLocation loc,
SubstitutionMap substitutions,
PreparedArguments &&preparedArgs,
SGFContext C) {
return emitBuiltinAddressOfBorrowBuiltins(SGF, loc, substitutions,
std::move(preparedArgs), C, /*stackProtected=*/ false);
}
/// Specialized emitter for Builtin.gepRaw.
static ManagedValue emitBuiltinGepRaw(SILGenFunction &SGF,
SILLocation loc,
SubstitutionMap substitutions,
ArrayRef<ManagedValue> args,
SGFContext C) {
assert(args.size() == 2 && "gepRaw should be given two arguments");
SILValue offsetPtr = SGF.B.createIndexRawPointer(loc,
args[0].getUnmanagedValue(),
args[1].getUnmanagedValue());
return ManagedValue::forObjectRValueWithoutOwnership(offsetPtr);
}
/// Specialized emitter for Builtin.gep.
static ManagedValue emitBuiltinGep(SILGenFunction &SGF,
SILLocation loc,
SubstitutionMap substitutions,
ArrayRef<ManagedValue> args,
SGFContext C) {
assert(substitutions.getReplacementTypes().size() == 1 &&
"gep should have two substitutions");
assert(args.size() == 3 && "gep should be given three arguments");
SILType ElemTy = SGF.getLoweredType(substitutions.getReplacementTypes()[0]);
SILType RawPtrType = args[0].getUnmanagedValue()->getType();
SILValue addr = SGF.B.createPointerToAddress(loc,
args[0].getUnmanagedValue(),
ElemTy.getAddressType(),
/*strict*/ true,
/*invariant*/ false);
addr = SGF.B.createIndexAddr(loc, addr, args[1].getUnmanagedValue(),
/*needsStackProtection=*/ true);
addr = SGF.B.createAddressToPointer(loc, addr, RawPtrType,
/*needsStackProtection=*/ true);
return ManagedValue::forObjectRValueWithoutOwnership(addr);
}
/// Specialized emitter for Builtin.getTailAddr.
static ManagedValue emitBuiltinGetTailAddr(SILGenFunction &SGF,
SILLocation loc,
SubstitutionMap substitutions,
ArrayRef<ManagedValue> args,
SGFContext C) {
assert(substitutions.getReplacementTypes().size() == 2 &&
"getTailAddr should have two substitutions");
assert(args.size() == 4 && "gep should be given four arguments");
SILType ElemTy = SGF.getLoweredType(substitutions.getReplacementTypes()[0]);
SILType TailTy = SGF.getLoweredType(substitutions.getReplacementTypes()[1]);
SILType RawPtrType = args[0].getUnmanagedValue()->getType();
SILValue addr = SGF.B.createPointerToAddress(loc,
args[0].getUnmanagedValue(),
ElemTy.getAddressType(),
/*strict*/ true,
/*invariant*/ false);
addr = SGF.B.createTailAddr(loc, addr, args[1].getUnmanagedValue(),
TailTy.getAddressType());
addr = SGF.B.createAddressToPointer(loc, addr, RawPtrType,
/*needsStackProtection=*/ false);
return ManagedValue::forObjectRValueWithoutOwnership(addr);
}
/// Specialized emitter for Builtin.beginUnpairedModifyAccess.
static ManagedValue emitBuiltinBeginUnpairedModifyAccess(SILGenFunction &SGF,
SILLocation loc,
SubstitutionMap substitutions,
ArrayRef<ManagedValue> args,
SGFContext C) {
assert(substitutions.getReplacementTypes().size() == 1 &&
"Builtin.beginUnpairedModifyAccess should have one substitution");
assert(args.size() == 3 &&
"beginUnpairedModifyAccess should be given three arguments");
SILType elemTy = SGF.getLoweredType(substitutions.getReplacementTypes()[0]);
SILValue addr = SGF.B.createPointerToAddress(loc,
args[0].getUnmanagedValue(),
elemTy.getAddressType(),
/*strict*/ true,
/*invariant*/ false);
SILType valueBufferTy =
SGF.getLoweredType(SGF.getASTContext().TheUnsafeValueBufferType);
SILValue buffer =
SGF.B.createPointerToAddress(loc, args[1].getUnmanagedValue(),
valueBufferTy.getAddressType(),
/*strict*/ true,
/*invariant*/ false);
SGF.B.createBeginUnpairedAccess(loc, addr, buffer, SILAccessKind::Modify,
SILAccessEnforcement::Dynamic,
/*noNestedConflict*/ false,
/*fromBuiltin*/ true);
return ManagedValue::forObjectRValueWithoutOwnership(SGF.emitEmptyTuple(loc));
}
/// Specialized emitter for Builtin.performInstantaneousReadAccess
static ManagedValue emitBuiltinPerformInstantaneousReadAccess(
SILGenFunction &SGF, SILLocation loc, SubstitutionMap substitutions,
ArrayRef<ManagedValue> args, SGFContext C) {
assert(substitutions.getReplacementTypes().size() == 1 &&
"Builtin.performInstantaneousReadAccess should have one substitution");
assert(args.size() == 2 &&
"Builtin.performInstantaneousReadAccess should be given "
"two arguments");
SILType elemTy = SGF.getLoweredType(substitutions.getReplacementTypes()[0]);
SILValue addr = SGF.B.createPointerToAddress(loc,
args[0].getUnmanagedValue(),
elemTy.getAddressType(),
/*strict*/ true,
/*invariant*/ false);
SILType valueBufferTy =
SGF.getLoweredType(SGF.getASTContext().TheUnsafeValueBufferType);
SILValue unusedBuffer = SGF.emitTemporaryAllocation(loc, valueBufferTy);
// Begin an "unscoped" read access. No nested conflict is possible because
// the compiler should generate the actual read for the KeyPath expression
// immediately after the call to this builtin, which forms the address of
// that real access. When noNestedConflict=true, no EndUnpairedAccess should
// be emitted.
//
// Unpaired access is necessary because a BeginAccess/EndAccess pair with no
// use will be trivially optimized away.
SGF.B.createBeginUnpairedAccess(loc, addr, unusedBuffer, SILAccessKind::Read,
SILAccessEnforcement::Dynamic,
/*noNestedConflict*/ true,
/*fromBuiltin*/ true);
return ManagedValue::forObjectRValueWithoutOwnership(SGF.emitEmptyTuple(loc));
}
/// Specialized emitter for Builtin.endUnpairedAccessModifyAccess.
static ManagedValue emitBuiltinEndUnpairedAccess(SILGenFunction &SGF,
SILLocation loc,
SubstitutionMap substitutions,
ArrayRef<ManagedValue> args,
SGFContext C) {
assert(substitutions.empty() &&
"Builtin.endUnpairedAccess should have no substitutions");
assert(args.size() == 1 &&
"endUnpairedAccess should be given one argument");
SILType valueBufferTy =
SGF.getLoweredType(SGF.getASTContext().TheUnsafeValueBufferType);
SILValue buffer = SGF.B.createPointerToAddress(loc,
args[0].getUnmanagedValue(),
valueBufferTy.getAddressType(),
/*strict*/ true,
/*invariant*/ false);
SGF.B.createEndUnpairedAccess(loc, buffer, SILAccessEnforcement::Dynamic,
/*aborted*/ false,
/*fromBuiltin*/ true);
return ManagedValue::forObjectRValueWithoutOwnership(SGF.emitEmptyTuple(loc));
}
/// Specialized emitter for the legacy Builtin.condfail.
static ManagedValue emitBuiltinLegacyCondFail(SILGenFunction &SGF,
SILLocation loc,
SubstitutionMap substitutions,
ArrayRef<ManagedValue> args,
SGFContext C) {
assert(args.size() == 1 && "condfail should be given one argument");
SGF.B.createCondFail(loc, args[0].getUnmanagedValue(),
"unknown runtime failure");
return ManagedValue::forObjectRValueWithoutOwnership(SGF.emitEmptyTuple(loc));
}
/// Specialized emitter for Builtin.castReference.
static ManagedValue
emitBuiltinCastReference(SILGenFunction &SGF,
SILLocation loc,
SubstitutionMap substitutions,
ArrayRef<ManagedValue> args,
SGFContext C) {
assert(args.size() == 1 && "castReference should be given one argument");
assert(substitutions.getReplacementTypes().size() == 2 &&
"castReference should have two subs");
auto fromTy = substitutions.getReplacementTypes()[0];
auto toTy = substitutions.getReplacementTypes()[1];
auto &fromTL = SGF.getTypeLowering(fromTy);
auto &toTL = SGF.getTypeLowering(toTy);
assert(!fromTL.isTrivial() && !toTL.isTrivial() && "expected ref type");
auto arg = args[0];
// TODO: Fix this API.
if (!fromTL.isAddress() || !toTL.isAddress()) {
if (SILType::canRefCast(arg.getType(), toTL.getLoweredType(), SGF.SGM.M)) {
// Create a reference cast, forwarding the cleanup.
// The cast takes the source reference.
return SGF.B.createUncheckedRefCast(loc, arg, toTL.getLoweredType());
}
}
// We are either casting between address-only types, or cannot promote to a
// cast of reference values.
//
// If the from/to types are invalid, then use a cast that will fail at
// runtime. We cannot catch these errors with SIL verification because they
// may legitimately occur during code specialization on dynamically
// unreachable paths.
//
// TODO: For now, we leave invalid casts in address form so that the runtime
// will trap. We could emit a noreturn call here instead which would provide
// more information to the optimizer.
SILValue srcVal = arg.ensurePlusOne(SGF, loc).forward(SGF);
SILValue fromAddr;
if (!fromTL.isAddress()) {
// Move the loadable value into a "source temp". Since the source and
// dest are RC identical, store the reference into the source temp without
// a retain. The cast will load the reference from the source temp and
// store it into a dest temp effectively forwarding the cleanup.
fromAddr = SGF.emitTemporaryAllocation(loc, srcVal->getType());
fromTL.emitStore(SGF.B, loc, srcVal, fromAddr,
StoreOwnershipQualifier::Init);
} else {
// The cast loads directly from the source address.
fromAddr = srcVal;
}
// Create a "dest temp" to hold the reference after casting it.
SILValue toAddr = SGF.emitTemporaryAllocation(loc, toTL.getLoweredType());
SGF.B.createUncheckedRefCastAddr(loc, fromAddr, fromTy->getCanonicalType(),
toAddr, toTy->getCanonicalType());
// Forward it along and register a cleanup.
if (toTL.isAddress())
return SGF.emitManagedBufferWithCleanup(toAddr);
// Load the destination value.
auto result = toTL.emitLoad(SGF.B, loc, toAddr, LoadOwnershipQualifier::Take);
return SGF.emitManagedRValueWithCleanup(result);
}
/// Specialized emitter for Builtin.reinterpretCast.
static ManagedValue emitBuiltinReinterpretCast(SILGenFunction &SGF,
SILLocation loc,
SubstitutionMap substitutions,
ArrayRef<ManagedValue> args,
SGFContext C) {
assert(args.size() == 1 && "reinterpretCast should be given one argument");
assert(substitutions.getReplacementTypes().size() == 2 &&
"reinterpretCast should have two subs");
auto &fromTL = SGF.getTypeLowering(substitutions.getReplacementTypes()[0]);
auto &toTL = SGF.getTypeLowering(substitutions.getReplacementTypes()[1]);
// If casting between address types, cast the address.
if (fromTL.isAddress() || toTL.isAddress()) {
SILValue fromAddr;
// If the from value is not an address, move it to a buffer.
if (!fromTL.isAddress()) {
fromAddr = SGF.emitTemporaryAllocation(loc, args[0].getValue()->getType());
fromTL.emitStore(SGF.B, loc, args[0].getValue(), fromAddr,
StoreOwnershipQualifier::Init);
} else {
fromAddr = args[0].getValue();
}
auto toAddr = SGF.B.createUncheckedAddrCast(loc, fromAddr,
toTL.getLoweredType().getAddressType());
// Load and retain the destination value if it's loadable. Leave the cleanup
// on the original value since we don't know anything about it's type.
if (!toTL.isAddress()) {
return SGF.emitManagedLoadCopy(loc, toAddr, toTL);
}
// Leave the cleanup on the original value.
if (toTL.isTrivial())
return ManagedValue::forTrivialAddressRValue(toAddr);
// Initialize the +1 result buffer without taking the incoming value. The
// source and destination cleanups will be independent.
return SGF.B.bufferForExpr(
loc, toTL.getLoweredType(), toTL, C,
[&](SILValue bufferAddr) {
SGF.B.createCopyAddr(loc, toAddr, bufferAddr, IsNotTake,
IsInitialization);
});
}
// Create the appropriate bitcast based on the source and dest types.
ManagedValue in = args[0];
SILType resultTy = toTL.getLoweredType();
return SGF.B.createUncheckedBitCast(loc, in, resultTy);
}
/// Specialized emitter for Builtin.castToBridgeObject.
static ManagedValue emitBuiltinCastToBridgeObject(SILGenFunction &SGF,
SILLocation loc,
SubstitutionMap subs,
ArrayRef<ManagedValue> args,
SGFContext C) {
assert(args.size() == 2 && "cast should have two arguments");
assert(subs.getReplacementTypes().size() == 1 &&
"cast should have a type substitution");
// Take the reference type argument and cast it to BridgeObject.
SILType objPointerType = SILType::getBridgeObjectType(SGF.F.getASTContext());
// Bail if the source type is not a class reference of some kind.
auto sourceType = subs.getReplacementTypes()[0];
if (!sourceType->mayHaveSuperclass() &&
!sourceType->isClassExistentialType()) {
SGF.SGM.diagnose(loc, diag::invalid_sil_builtin,
"castToBridgeObject source must be a class");
return SGF.emitUndef(objPointerType);
}
ManagedValue ref = args[0];
SILValue bits = args[1].getUnmanagedValue();
// If the argument is existential, open it.
if (sourceType->isClassExistentialType()) {
auto openedTy = OpenedArchetypeType::get(sourceType->getCanonicalType(),
SGF.F.getGenericSignature());
SILType loweredOpenedTy = SGF.getLoweredLoadableType(openedTy);
ref = SGF.B.createOpenExistentialRef(loc, ref, loweredOpenedTy);
}
return SGF.B.createRefToBridgeObject(loc, ref, bits);
}
/// Specialized emitter for Builtin.castReferenceFromBridgeObject.
static ManagedValue emitBuiltinCastReferenceFromBridgeObject(
SILGenFunction &SGF,
SILLocation loc,
SubstitutionMap subs,
ArrayRef<ManagedValue> args,
SGFContext C) {
assert(args.size() == 1 && "cast should have one argument");
assert(subs.getReplacementTypes().size() == 1 &&
"cast should have a type substitution");
// The substitution determines the destination type.
auto destTy = subs.getReplacementTypes()[0];
SILType destType = SGF.getLoweredType(destTy);
// Bail if the source type is not a class reference of some kind.
if (!destTy->isBridgeableObjectType() || !destType.isObject()) {
SGF.SGM.diagnose(loc, diag::invalid_sil_builtin,
"castReferenceFromBridgeObject dest must be an object type");
// Recover by propagating an undef result.
return SGF.emitUndef(destType);
}
return SGF.B.createBridgeObjectToRef(loc, args[0], destType);
}
static ManagedValue emitBuiltinCastBitPatternFromBridgeObject(
SILGenFunction &SGF,
SILLocation loc,
SubstitutionMap subs,
ArrayRef<ManagedValue> args,
SGFContext C) {
assert(args.size() == 1 && "cast should have one argument");
assert(subs.empty() && "cast should not have subs");
SILType wordType = SILType::getBuiltinWordType(SGF.getASTContext());
SILValue result = SGF.B.createBridgeObjectToWord(loc, args[0].getValue(),
wordType);
return ManagedValue::forObjectRValueWithoutOwnership(result);
}
static ManagedValue emitBuiltinClassifyBridgeObject(SILGenFunction &SGF,
SILLocation loc,
SubstitutionMap subs,
ArrayRef<ManagedValue> args,
SGFContext C) {
assert(args.size() == 1 && "classify should have one argument");
assert(subs.empty() && "classify should not have subs");
SILValue result = SGF.B.createClassifyBridgeObject(loc, args[0].getValue());
return ManagedValue::forObjectRValueWithoutOwnership(result);
}
static ManagedValue emitBuiltinValueToBridgeObject(SILGenFunction &SGF,
SILLocation loc,
SubstitutionMap subs,
ArrayRef<ManagedValue> args,
SGFContext C) {
assert(args.size() == 1 && "ValueToBridgeObject should have one argument");
assert(subs.getReplacementTypes().size() == 1 &&
"ValueToBridgeObject should have one sub");
Type argTy = subs.getReplacementTypes()[0];
if (!argTy->is<BuiltinIntegerType>()) {
SGF.SGM.diagnose(loc, diag::invalid_sil_builtin,
"argument to builtin should be a builtin integer");
SILType objPointerType = SILType::getBridgeObjectType(SGF.F.getASTContext());
return SGF.emitUndef(objPointerType);
}
SILValue result = SGF.B.createValueToBridgeObject(loc, args[0].getValue());
return SGF.emitManagedCopy(loc, result);
}
// This should only accept as an operand type single-refcounted-pointer types,
// class existentials, or single-payload enums (optional). Type checking must be
// deferred until IRGen so Builtin.isUnique can be called from a transparent
// generic wrapper (we can only type check after specialization).
static ManagedValue emitBuiltinIsUnique(SILGenFunction &SGF,
SILLocation loc,
SubstitutionMap subs,
ArrayRef<ManagedValue> args,
SGFContext C) {
assert(subs.getReplacementTypes().size() == 1 &&
"isUnique should have a single substitution");
assert(args.size() == 1 && "isUnique should have a single argument");
assert((args[0].getType().isAddress() && !args[0].hasCleanup()) &&
"Builtin.isUnique takes an address.");
return ManagedValue::forObjectRValueWithoutOwnership(
SGF.B.createIsUnique(loc, args[0].getValue()));
}
// This force-casts the incoming address to NativeObject assuming the caller has
// performed all necessary checks. For example, this may directly cast a
// single-payload enum to a NativeObject reference.
static ManagedValue
emitBuiltinIsUnique_native(SILGenFunction &SGF,
SILLocation loc,
SubstitutionMap subs,
ArrayRef<ManagedValue> args,
SGFContext C) {
assert(subs.getReplacementTypes().size() == 1 &&
"isUnique_native should have one sub.");
assert(args.size() == 1 && "isUnique_native should have one arg.");
auto ToType =
SILType::getNativeObjectType(SGF.getASTContext()).getAddressType();
auto toAddr = SGF.B.createUncheckedAddrCast(loc, args[0].getValue(), ToType);
SILValue result = SGF.B.createIsUnique(loc, toAddr);
return ManagedValue::forObjectRValueWithoutOwnership(result);
}
static ManagedValue
emitBuiltinBeginCOWMutation(SILGenFunction &SGF,
SILLocation loc,
SubstitutionMap subs,
ArrayRef<ManagedValue> args,
SGFContext C) {
assert(subs.getReplacementTypes().size() == 1 &&
"BeginCOWMutation should have one sub.");
assert(args.size() == 1 && "isUnique_native should have one arg.");
SILValue refAddr = args[0].getValue();
auto *ref = SGF.B.createLoad(loc, refAddr, LoadOwnershipQualifier::Take);
BeginCOWMutationInst *beginCOW = SGF.B.createBeginCOWMutation(loc, ref, /*isNative*/ false);
SGF.B.createStore(loc, beginCOW->getBufferResult(), refAddr, StoreOwnershipQualifier::Init);
return ManagedValue::forObjectRValueWithoutOwnership(
beginCOW->getUniquenessResult());
}
static ManagedValue
emitBuiltinBeginCOWMutation_native(SILGenFunction &SGF,
SILLocation loc,
SubstitutionMap subs,
ArrayRef<ManagedValue> args,
SGFContext C) {
assert(subs.getReplacementTypes().size() == 1 &&