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SerializeSIL.cpp
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//===--- SerializeSIL.cpp - Read and write SIL ----------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2020 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
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "sil-serialize"
#include "SILFormat.h"
#include "Serialization.h"
#include "swift/AST/ASTMangler.h"
#include "swift/AST/GenericEnvironment.h"
#include "swift/AST/GenericSignature.h"
#include "swift/AST/Module.h"
#include "swift/AST/ProtocolConformance.h"
#include "swift/Basic/Assertions.h"
#include "swift/SIL/CFG.h"
#include "swift/SIL/PrettyStackTrace.h"
#include "swift/SIL/SILArgument.h"
#include "swift/SIL/SILInstruction.h"
#include "swift/SIL/SILModule.h"
#include "swift/SIL/SILUndef.h"
#include "swift/SIL/TerminatorUtils.h"
#include "swift/SILOptimizer/Utils/Generics.h"
#include "swift/Strings.h"
#include "llvm/ADT/MapVector.h"
#include "llvm/ADT/PostOrderIterator.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/DJB.h"
#include "llvm/Support/EndianStream.h"
#include "llvm/Support/OnDiskHashTable.h"
#include <type_traits>
using namespace swift;
using namespace swift::serialization;
using namespace swift::serialization::sil_block;
using namespace llvm::support;
using llvm::BCBlockRAII;
static unsigned toStableStringEncoding(StringLiteralInst::Encoding encoding) {
switch (encoding) {
case StringLiteralInst::Encoding::Bytes: return SIL_BYTES;
case StringLiteralInst::Encoding::UTF8: return SIL_UTF8;
case StringLiteralInst::Encoding::ObjCSelector: return SIL_OBJC_SELECTOR;
case StringLiteralInst::Encoding::UTF8_OSLOG: return SIL_UTF8_OSLOG;
}
llvm_unreachable("bad string encoding");
}
static unsigned toStableSILLinkage(SILLinkage linkage) {
switch (linkage) {
case SILLinkage::Public: return SIL_LINKAGE_PUBLIC;
case SILLinkage::PublicNonABI: return SIL_LINKAGE_PUBLIC_NON_ABI;
case SILLinkage::Package: return SIL_LINKAGE_PACKAGE;
case SILLinkage::PackageNonABI: return SIL_LINKAGE_PACKAGE_NON_ABI;
case SILLinkage::Hidden: return SIL_LINKAGE_HIDDEN;
case SILLinkage::Shared: return SIL_LINKAGE_SHARED;
case SILLinkage::Private: return SIL_LINKAGE_PRIVATE;
case SILLinkage::PublicExternal: return SIL_LINKAGE_PUBLIC_EXTERNAL;
case SILLinkage::PackageExternal: return SIL_LINKAGE_PACKAGE_EXTERNAL;
case SILLinkage::HiddenExternal: return SIL_LINKAGE_HIDDEN_EXTERNAL;
}
llvm_unreachable("bad linkage");
}
static unsigned toStableVTableEntryKind(SILVTable::Entry::Kind kind) {
switch (kind) {
case SILVTable::Entry::Kind::Normal: return SIL_VTABLE_ENTRY_NORMAL;
case SILVTable::Entry::Kind::Inherited: return SIL_VTABLE_ENTRY_INHERITED;
case SILVTable::Entry::Kind::Override: return SIL_VTABLE_ENTRY_OVERRIDE;
}
llvm_unreachable("bad vtable entry kind");
}
static unsigned toStableCastConsumptionKind(CastConsumptionKind kind) {
switch (kind) {
case CastConsumptionKind::TakeAlways:
return SIL_CAST_CONSUMPTION_TAKE_ALWAYS;
case CastConsumptionKind::TakeOnSuccess:
return SIL_CAST_CONSUMPTION_TAKE_ON_SUCCESS;
case CastConsumptionKind::CopyOnSuccess:
return SIL_CAST_CONSUMPTION_COPY_ON_SUCCESS;
case CastConsumptionKind::BorrowAlways:
return SIL_CAST_CONSUMPTION_BORROW_ALWAYS;
}
llvm_unreachable("bad cast consumption kind");
}
static unsigned
toStableDifferentiabilityKind(swift::DifferentiabilityKind kind) {
switch (kind) {
case swift::DifferentiabilityKind::NonDifferentiable:
return (unsigned)serialization::DifferentiabilityKind::NonDifferentiable;
case swift::DifferentiabilityKind::Forward:
return (unsigned)serialization::DifferentiabilityKind::Forward;
case swift::DifferentiabilityKind::Reverse:
return (unsigned)serialization::DifferentiabilityKind::Reverse;
case swift::DifferentiabilityKind::Normal:
return (unsigned)serialization::DifferentiabilityKind::Normal;
case swift::DifferentiabilityKind::Linear:
return (unsigned)serialization::DifferentiabilityKind::Linear;
}
llvm_unreachable("covered switch");
}
static unsigned encodeValueOwnership(ValueOwnershipKind ownership) {
assert(ownership.value > 0 && "invalid value ownership");
return ownership.value - 1;
}
namespace {
/// Used to serialize the on-disk func hash table.
class FuncTableInfo {
Serializer &S;
public:
using key_type = StringRef;
using key_type_ref = key_type;
using data_type = DeclID;
using data_type_ref = const data_type &;
using hash_value_type = uint32_t;
using offset_type = unsigned;
explicit FuncTableInfo(Serializer &S) : S(S) {}
hash_value_type ComputeHash(key_type_ref key) {
assert(!key.empty());
return llvm::djbHash(key, SWIFTMODULE_HASH_SEED);
}
std::pair<unsigned, unsigned> EmitKeyDataLength(raw_ostream &out,
key_type_ref key,
data_type_ref data) {
return { sizeof(uint32_t), sizeof(uint32_t) };
}
void EmitKey(raw_ostream &out, key_type_ref key, unsigned len) {
uint32_t keyID = S.addUniquedStringRef(key);
endian::write<uint32_t>(out, keyID, llvm::endianness::little);
}
void EmitData(raw_ostream &out, key_type_ref key, data_type_ref data,
unsigned len) {
endian::write<uint32_t>(out, data, llvm::endianness::little);
}
};
class SILSerializer {
using TypeID = serialization::TypeID;
using DebugScopeID = DeclID;
using DebugScopeIDField = DeclIDField;
using LocationID = DeclID;
using LocationIDField = DeclIDField;
Serializer &S;
llvm::BitstreamWriter &Out;
/// A reusable buffer for emitting records.
SmallVector<uint64_t, 64> ScratchRecord;
/// In case we want to encode the relative of InstID vs ValueID.
uint32_t /*ValueID*/ InstID = 0;
llvm::DenseMap<const ValueBase*, ValueID> ValueIDs;
ValueID addValueRef(const ValueBase *Val);
public:
using TableData = FuncTableInfo::data_type;
using Table = llvm::MapVector<FuncTableInfo::key_type, TableData>;
private:
/// FuncTable maps function name to an ID.
Table FuncTable;
std::vector<BitOffset> Funcs;
/// The current function ID.
uint32_t /*DeclID*/ NextFuncID = 1;
/// Maps class name to a VTable ID.
Table VTableList;
/// Holds the list of VTables.
std::vector<BitOffset> VTableOffset;
uint32_t /*DeclID*/ NextVTableID = 1;
/// Maps nominal type name to a MoveOnlyDeinit ID.
Table MoveOnlyDeinitList;
/// Holds the list of MoveOnlyDeinits.
std::vector<BitOffset> MoveOnlyDeinitOffset;
uint32_t /*DeclID*/ NextMoveOnlyDeinitOffsetID = 1;
/// Maps global variable name to an ID.
Table GlobalVarList;
/// Holds the list of SIL global variables.
std::vector<BitOffset> GlobalVarOffset;
uint32_t /*DeclID*/ NextGlobalVarID = 1;
/// Maps witness table identifier to an ID.
Table WitnessTableList;
/// Holds the list of WitnessTables.
std::vector<BitOffset> WitnessTableOffset;
uint32_t /*DeclID*/ NextWitnessTableID = 1;
/// Maps default witness table identifier to an ID.
Table DefaultWitnessTableList;
/// Holds the list of DefaultWitnessTables.
std::vector<BitOffset> DefaultWitnessTableOffset;
uint32_t /*DeclID*/ NextDefaultWitnessTableID = 1;
/// Holds the list of Properties.
std::vector<BitOffset> PropertyOffset;
/// Maps differentiability witness identifier to an ID.
Table DifferentiabilityWitnessList;
/// Holds the list of SIL differentiability witnesses.
std::vector<BitOffset> DifferentiabilityWitnessOffset;
uint32_t /*DeclID*/ NextDifferentiabilityWitnessID = 1;
llvm::DenseMap<PointerUnion<const SILDebugScope *, SILFunction *>, DeclID>
DebugScopeMap;
llvm::DenseMap<const void *, unsigned> SourceLocMap;
/// Give each SILBasicBlock a unique ID.
llvm::DenseMap<const SILBasicBlock *, unsigned> BasicBlockMap;
/// Functions that we've emitted a reference to. If the key maps
/// to true, we want to emit a declaration only.
llvm::DenseMap<const SILFunction *, bool> FuncsToEmit;
bool OnlyReferencedByDebugInfo = false;
llvm::DenseSet<const SILFunction *> FuncsToEmitDebug;
/// Global variables that we've emitted a reference to.
llvm::DenseSet<const SILGlobalVariable *> GlobalsToEmit;
/// Referenced differentiability witnesses that need to be emitted.
llvm::DenseSet<const SILDifferentiabilityWitness *>
DifferentiabilityWitnessesToEmit;
/// Additional functions we might need to serialize.
llvm::SmallVector<const SILFunction *, 16> functionWorklist;
llvm::SmallVector<const SILGlobalVariable *, 16> globalWorklist;
/// String storage for temporarily created strings which are referenced from
/// the tables.
llvm::BumpPtrAllocator StringTable;
std::array<unsigned, 256> SILAbbrCodes;
template <typename Layout>
void registerSILAbbr() {
using AbbrArrayTy = decltype(SILAbbrCodes);
static_assert(Layout::Code <= std::tuple_size<AbbrArrayTy>::value,
"layout has invalid record code");
SILAbbrCodes[Layout::Code] = Layout::emitAbbrev(Out);
LLVM_DEBUG(llvm::dbgs() << "SIL abbre code " << SILAbbrCodes[Layout::Code]
<< " for layout " << Layout::Code << "\n");
}
bool ShouldSerializeAll;
bool SerializeDebugInfoSIL;
void addMandatorySILFunction(const SILFunction *F,
bool emitDeclarationsForOnoneSupport);
void addReferencedSILFunction(const SILFunction *F,
bool DeclOnly = false);
void addReferencedGlobalVariable(const SILGlobalVariable *gl);
void processWorklists();
/// Helper function to update ListOfValues for MethodInst. Format:
/// Attr, SILDeclRef (DeclID, Kind, uncurryLevel), and an operand.
void handleMethodInst(const MethodInst *MI, SILValue operand,
SmallVectorImpl<uint64_t> &ListOfValues);
void writeSILFunction(const SILFunction &F, bool DeclOnly = false);
void writeSILBasicBlock(const SILBasicBlock &BB);
void writeSILInstruction(const SILInstruction &SI);
void writeSILVTable(const SILVTable &vt);
void writeSILMoveOnlyDeinit(const SILMoveOnlyDeinit &deinit);
void writeSILGlobalVar(const SILGlobalVariable &g);
void writeSILWitnessTable(const SILWitnessTable &wt);
void writeSILWitnessTableEntry(const SILWitnessTable::Entry &entry,
SerializedKind_t serializedKind);
void writeSILDefaultWitnessTable(const SILDefaultWitnessTable &wt);
void
writeSILDifferentiabilityWitness(const SILDifferentiabilityWitness &dw);
void writeSILProperty(const SILProperty &prop);
void writeSILBlock(const SILModule *SILMod);
void writeIndexTables();
/// Serialize and write SILDebugScope graph in post order.
void writeDebugScopes(const SILDebugScope *Scope, const SourceManager &SM);
void writeSourceLoc(SILLocation SLoc, const SourceManager &SM);
void writeNoOperandLayout(const SILInstruction *I) {
unsigned abbrCode = SILAbbrCodes[SILInstNoOperandLayout::Code];
SILInstNoOperandLayout::emitRecord(Out, ScratchRecord, abbrCode,
(unsigned)I->getKind());
}
void writeConversionLikeInstruction(const SingleValueInstruction *I,
unsigned attrs);
void writeOneTypeLayout(SILInstructionKind valueKind,
unsigned attrs, SILType type);
void writeOneTypeLayout(SILInstructionKind valueKind,
unsigned attrs, CanType type);
void writeOneTypeOneOperandLayout(SILInstructionKind valueKind,
unsigned attrs,
SILType type,
SILValue operand);
void writeOneTypeOneOperandLayout(SILInstructionKind valueKind,
unsigned attrs,
CanType type,
SILValue operand);
void writeOneTypeOneOperandExtraAttributeLayout(
SILInstructionKind valueKind, unsigned attrs,
SILType type, SILValue operand);
void writeOneOperandLayout(SILInstructionKind valueKind,
unsigned attrs,
SILValue operand);
void writeOneOperandExtraAttributeLayout(SILInstructionKind valueKind,
unsigned attrs, SILValue operand);
void writeKeyPathPatternComponent(
const KeyPathPatternComponent &component,
SmallVectorImpl<uint64_t> &ListOfValues);
/// Helper function to determine if given the current state of the
/// deserialization if the function body for F should be deserialized.
bool shouldEmitFunctionBody(const SILFunction *F, bool isReference = true);
IdentifierID addSILFunctionRef(SILFunction *F);
public:
SILSerializer(Serializer &S, llvm::BitstreamWriter &Out, bool serializeAll,
bool serializeDebugInfo)
: S(S), Out(Out), ShouldSerializeAll(serializeAll),
SerializeDebugInfoSIL(serializeDebugInfo) {}
void writeSILModule(const SILModule *SILMod);
};
} // end anonymous namespace
void SILSerializer::addMandatorySILFunction(const SILFunction *F,
bool emitDeclarationsForOnoneSupport) {
// If this function is not fragile, don't do anything.
if (!emitDeclarationsForOnoneSupport &&
!shouldEmitFunctionBody(F, /* isReference */ false))
return;
auto iter = FuncsToEmit.find(F);
if (iter != FuncsToEmit.end()) {
// We've already visited this function. Make sure that we decided
// to emit its body the first time around.
assert(iter->second == emitDeclarationsForOnoneSupport
&& "Already emitting declaration");
return;
}
// We haven't seen this function before. Record that we want to
// emit its body, and add it to the worklist.
FuncsToEmit[F] = emitDeclarationsForOnoneSupport;
// Function body should be serialized unless it is a KeepAsPublic function
// (which is typically a pre-specialization).
if (!emitDeclarationsForOnoneSupport)
functionWorklist.push_back(F);
}
void SILSerializer::addReferencedSILFunction(const SILFunction *F,
bool DeclOnly) {
assert(F != nullptr);
if (FuncsToEmit.count(F) > 0)
return;
// We haven't seen this function before. Let's see if we should
// serialize the body or just the declaration.
if (shouldEmitFunctionBody(F)) {
FuncsToEmit[F] = false;
functionWorklist.push_back(F);
return;
}
if (F->getLinkage() == SILLinkage::Shared) {
assert(F->isAnySerialized() || F->hasForeignBody());
FuncsToEmit[F] = false;
functionWorklist.push_back(F);
return;
}
// Ok, we just need to emit a declaration.
FuncsToEmit[F] = true;
}
void SILSerializer::addReferencedGlobalVariable(const SILGlobalVariable *gl) {
if (GlobalsToEmit.insert(gl).second)
globalWorklist.push_back(gl);
}
void SILSerializer::processWorklists() {
do {
while (!functionWorklist.empty()) {
const SILFunction *F = functionWorklist.pop_back_val();
assert(F != nullptr);
assert(FuncsToEmit.count(F) > 0);
writeSILFunction(*F, FuncsToEmit[F]);
}
while (!globalWorklist.empty()) {
const SILGlobalVariable *gl = globalWorklist.pop_back_val();
assert(GlobalsToEmit.count(gl) > 0);
writeSILGlobalVar(*gl);
}
} while (!functionWorklist.empty());
}
/// We enumerate all values in a SILFunction beforehand to correctly
/// handle forward references of values.
ValueID SILSerializer::addValueRef(const ValueBase *Val) {
if (!Val)
return 0;
if (auto *Undef = dyn_cast<SILUndef>(Val)) {
// The first two IDs are reserved for SILUndef.
if (Undef->getOwnershipKind() == OwnershipKind::None)
return 0;
assert(Undef->getOwnershipKind() == OwnershipKind::Owned);
return 1;
}
ValueID id = ValueIDs[Val];
assert(id != 0 && "We should have assigned a value ID to each value.");
return id;
}
void SILSerializer::writeSILFunction(const SILFunction &F, bool DeclOnly) {
PrettyStackTraceSILFunction stackTrace("Serializing", &F);
ValueIDs.clear();
InstID = 0;
FuncTable[F.getName()] = NextFuncID++;
Funcs.push_back(Out.GetCurrentBitNo());
unsigned abbrCode = SILAbbrCodes[SILFunctionLayout::Code];
TypeID FnID = S.addTypeRef(F.getLoweredType().getRawASTType());
LLVM_DEBUG(llvm::dbgs() << "SILFunction " << F.getName() << " @ BitNo "
<< Out.GetCurrentBitNo() << " abbrCode " << abbrCode
<< " FnID " << FnID << "\n");
LLVM_DEBUG(llvm::dbgs() << "Serialized SIL:\n"; F.dump());
SmallVector<IdentifierID, 1> SemanticsIDs;
for (auto SemanticAttr : F.getSemanticsAttrs()) {
SemanticsIDs.push_back(S.addUniquedStringRef(SemanticAttr));
}
SILLinkage Linkage = F.getLinkage();
// Check if we need to emit a body for this function.
bool NoBody = DeclOnly || isAvailableExternally(Linkage) ||
F.isExternalDeclaration();
// If we don't emit a function body then make sure to mark the declaration
// as available externally.
if (NoBody) {
Linkage = addExternalToLinkage(Linkage);
}
assert(F.getCapturedEnvironments().empty() &&
"Captured local environments should not survive past SILGen");
// If we have a body, we might have a generic environment.
GenericSignatureID genericSigID = 0;
if (!NoBody || OnlyReferencedByDebugInfo)
if (auto *genericEnv = F.getGenericEnvironment())
genericSigID = S.addGenericSignatureRef(genericEnv->getGenericSignature());
DeclID clangNodeOwnerID;
if (F.hasClangNode())
clangNodeOwnerID = S.addDeclRef(F.getClangNodeOwner());
ModuleID parentModuleID;
if (auto *parentModule = F.getParentModule())
parentModuleID = S.addModuleRef(parentModule);
IdentifierID replacedFunctionID = 0;
if (auto *fun = F.getDynamicallyReplacedFunction()) {
addReferencedSILFunction(fun, true);
replacedFunctionID = S.addUniquedStringRef(fun->getName());
} else if (F.hasObjCReplacement()) {
replacedFunctionID =
S.addUniquedStringRef(F.getObjCReplacement().str());
}
IdentifierID usedAdHocWitnessFunctionID = 0;
if (auto *fun = F.getReferencedAdHocRequirementWitnessFunction()) {
addReferencedSILFunction(fun, true);
usedAdHocWitnessFunctionID = S.addUniquedStringRef(fun->getName());
}
unsigned numAttrs = NoBody ? 0 : F.getSpecializeAttrs().size();
auto resilience = F.getModule().getSwiftModule()->getResilienceStrategy();
bool serializeDerivedEffects = (resilience != ResilienceStrategy::Resilient) &&
!F.hasSemanticsAttr("optimize.no.crossmodule");
F.visitArgEffects(
[&](int effectIdx, int argumentIndex, bool isDerived) {
if (isDerived && !serializeDerivedEffects)
return;
numAttrs++;
});
std::optional<llvm::VersionTuple> available;
auto availability = F.getAvailabilityForLinkage();
if (!availability.isAlwaysAvailable()) {
available = availability.getRawMinimumVersion();
}
ENCODE_VER_TUPLE(available, available)
SILFunctionLayout::emitRecord(
Out, ScratchRecord, abbrCode, toStableSILLinkage(Linkage),
(unsigned)F.isTransparent(), (unsigned)F.getSerializedKind(),
(unsigned)F.isThunk(), (unsigned)F.isWithoutActuallyEscapingThunk(),
(unsigned)F.getSpecialPurpose(), (unsigned)F.getInlineStrategy(),
(unsigned)F.getOptimizationMode(), (unsigned)F.getPerfConstraints(),
(unsigned)F.getClassSubclassScope(), (unsigned)F.hasCReferences(),
(unsigned)F.getEffectsKind(), (unsigned)numAttrs,
(unsigned)F.hasOwnership(), F.isAlwaysWeakImported(),
LIST_VER_TUPLE_PIECES(available), (unsigned)F.isDynamicallyReplaceable(),
(unsigned)F.isExactSelfClass(), (unsigned)F.isDistributed(),
(unsigned)F.isRuntimeAccessible(),
(unsigned)F.forceEnableLexicalLifetimes(), OnlyReferencedByDebugInfo,
FnID, replacedFunctionID, usedAdHocWitnessFunctionID, genericSigID,
clangNodeOwnerID, parentModuleID, SemanticsIDs);
F.visitArgEffects(
[&](int effectIdx, int argumentIndex, bool isDerived) {
if (isDerived && !serializeDerivedEffects)
return;
llvm::SmallString<64> buffer;
llvm::raw_svector_ostream OS(buffer);
F.writeEffect(OS, effectIdx);
IdentifierID effectsStrID = S.addUniquedStringRef(OS.str());
unsigned abbrCode = SILAbbrCodes[SILArgEffectsAttrLayout::Code];
bool isGlobalSideEffects = (argumentIndex < 0);
unsigned argIdx = (isGlobalSideEffects ? 0 : (unsigned)argumentIndex);
SILArgEffectsAttrLayout::emitRecord(
Out, ScratchRecord, abbrCode, effectsStrID,
argIdx, (unsigned)isGlobalSideEffects, (unsigned)isDerived);
});
if (NoBody)
return;
for (auto *SA : F.getSpecializeAttrs()) {
unsigned specAttrAbbrCode = SILAbbrCodes[SILSpecializeAttrLayout::Code];
IdentifierID targetFunctionNameID = 0;
if (auto *target = SA->getTargetFunction()) {
addReferencedSILFunction(target, true);
targetFunctionNameID = S.addUniquedStringRef(target->getName());
}
IdentifierID spiGroupID = 0;
IdentifierID spiModuleDeclID = 0;
auto ident = SA->getSPIGroup();
if (!ident.empty()) {
spiGroupID = S.addUniquedStringRef(ident.str());
spiModuleDeclID = S.addModuleRef(SA->getSPIModule());
}
auto availability = SA->getAvailability();
if (!availability.isAlwaysAvailable()) {
available = availability.getRawMinimumVersion();
}
ENCODE_VER_TUPLE(available, available)
llvm::SmallVector<IdentifierID, 4> typeErasedParamsIDs;
for (auto ty : SA->getTypeErasedParams()) {
typeErasedParamsIDs.push_back(S.addTypeRef(ty));
}
SILSpecializeAttrLayout::emitRecord(
Out, ScratchRecord, specAttrAbbrCode, (unsigned)SA->isExported(),
(unsigned)SA->getSpecializationKind(),
S.addGenericSignatureRef(SA->getSpecializedSignature()),
targetFunctionNameID, spiGroupID, spiModuleDeclID,
LIST_VER_TUPLE_PIECES(available), typeErasedParamsIDs
);
}
DebugScopeMap.clear();
SourceLocMap.clear();
if (SerializeDebugInfoSIL)
writeDebugScopes(F.getDebugScope(), F.getModule().getSourceManager());
// Assign a unique ID to each basic block of the SILFunction.
unsigned BasicID = 0;
BasicBlockMap.clear();
// Assign a value ID to each SILInstruction that has value and to each basic
// block argument.
//
// FIXME: Add reverse iteration to SILSuccessor and convert this to a "stable"
// RPO order. Currently, the serializer inverts the order of successors each
// time they are processed.
//
// The first valid value ID is 2. 0 and 1 are reserved for SILUndef.
unsigned ValueID = 2;
llvm::ReversePostOrderTraversal<SILFunction *> RPOT(
const_cast<SILFunction *>(&F));
for (auto Iter = RPOT.begin(), E = RPOT.end(); Iter != E; ++Iter) {
auto &BB = **Iter;
BasicBlockMap.insert(std::make_pair(&BB, BasicID++));
for (auto I = BB.args_begin(), E = BB.args_end(); I != E; ++I)
ValueIDs[static_cast<const ValueBase*>(*I)] = ValueID++;
for (const SILInstruction &SI : BB)
for (auto result : SI.getResults())
ValueIDs[result] = ValueID++;
}
// Write SIL basic blocks in the RPOT order
// to make sure that instructions defining open archetypes
// are serialized before instructions using those opened
// archetypes.
unsigned SerializedBBNum = 0;
for (auto Iter = RPOT.begin(), E = RPOT.end(); Iter != E; ++Iter) {
auto *BB = *Iter;
writeSILBasicBlock(*BB);
SerializedBBNum++;
}
assert(BasicID == SerializedBBNum && "Wrong number of BBs was serialized");
}
void SILSerializer::writeSILBasicBlock(const SILBasicBlock &BB) {
SmallVector<DeclID, 4> Args;
for (auto I = BB.args_begin(), E = BB.args_end(); I != E; ++I) {
SILArgument *SA = *I;
DeclID tId = S.addTypeRef(SA->getType().getRawASTType());
DeclID vId = addValueRef(static_cast<const ValueBase*>(SA));
Args.push_back(tId);
// We put these static asserts here to formalize our assumption that both
// SILValueCategory and ValueOwnershipKind have uint8_t as their underlying
// pointer values.
static_assert(
std::is_same<
std::underlying_type<decltype(SA->getType().getCategory())>::type,
uint8_t>::value,
"Expected an underlying uint8_t type");
// We put these static asserts here to formalize our assumption that both
// SILValueCategory and ValueOwnershipKind have uint8_t as their underlying
// pointer values.
static_assert(std::is_same<std::underlying_type<decltype(
SA->getOwnershipKind())::innerty>::type,
uint8_t>::value,
"Expected an underlying uint8_t type");
// This is 31 bits in size.
unsigned packedMetadata = 0;
packedMetadata |= unsigned(SA->getType().getCategory()); // 8 bits
packedMetadata |= unsigned(SA->getOwnershipKind()) << 8; // 3 bits
packedMetadata |= unsigned(SA->isReborrow()) << 11; // 1 bit
packedMetadata |= unsigned(SA->hasPointerEscape()) << 12; // 1 bit
if (auto *SFA = dyn_cast<SILFunctionArgument>(SA)) {
packedMetadata |= unsigned(SFA->isNoImplicitCopy()) << 13; // 1 bit
packedMetadata |= unsigned(SFA->getLifetimeAnnotation()) << 14; // 2 bits
packedMetadata |= unsigned(SFA->isClosureCapture()) << 16; // 1 bit
packedMetadata |= unsigned(SFA->isFormalParameterPack()) << 17; // 1 bit
}
// Used: 17 bits. Free: 15.
//
// TODO: We should be able to shrink the packed metadata of the first two.
Args.push_back(packedMetadata);
Args.push_back(vId);
}
unsigned abbrCode = SILAbbrCodes[SILBasicBlockLayout::Code];
SILBasicBlockLayout::emitRecord(Out, ScratchRecord, abbrCode, Args);
const SILDebugScope *Prev = BB.getParent()->getDebugScope();
auto &SM = BB.getParent()->getModule().getSourceManager();
for (const SILInstruction &SI : BB) {
if (SerializeDebugInfoSIL) {
if (SI.getDebugScope() != Prev) {
Prev = SI.getDebugScope();
writeDebugScopes(Prev, SM);
}
}
if (SerializeDebugInfoSIL) {
writeSourceLoc(SI.getLoc(), SM);
}
writeSILInstruction(SI);
}
}
/// Add SILDeclRef to ListOfValues, so we can reconstruct it at
/// deserialization.
static void handleSILDeclRef(Serializer &S, const SILDeclRef &Ref,
SmallVectorImpl<uint64_t> &ListOfValues) {
ListOfValues.push_back(S.addDeclRef(Ref.getDecl()));
ListOfValues.push_back((unsigned)Ref.kind);
ListOfValues.push_back(Ref.isForeign);
}
/// Get an identifier ref for a SILFunction and add it to the list of referenced
/// functions.
IdentifierID SILSerializer::addSILFunctionRef(SILFunction *F) {
addReferencedSILFunction(F);
return S.addUniquedStringRef(F->getName());
}
/// Helper function to update ListOfValues for MethodInst. Format:
/// Attr, SILDeclRef (DeclID, Kind, uncurryLevel), and an operand.
void SILSerializer::handleMethodInst(const MethodInst *MI,
SILValue operand,
SmallVectorImpl<uint64_t> &ListOfValues) {
handleSILDeclRef(S, MI->getMember(), ListOfValues);
ListOfValues.push_back(
S.addTypeRef(operand->getType().getRawASTType()));
ListOfValues.push_back((unsigned)operand->getType().getCategory());
ListOfValues.push_back(addValueRef(operand));
}
void SILSerializer::writeOneTypeLayout(SILInstructionKind valueKind,
unsigned attrs, SILType type) {
unsigned abbrCode = SILAbbrCodes[SILOneTypeLayout::Code];
SILOneTypeLayout::emitRecord(Out, ScratchRecord, abbrCode,
(unsigned) valueKind, attrs,
S.addTypeRef(type.getRawASTType()),
(unsigned)type.getCategory());
}
void SILSerializer::writeOneTypeLayout(SILInstructionKind valueKind,
unsigned attrs, CanType type) {
unsigned abbrCode = SILAbbrCodes[SILOneTypeLayout::Code];
SILOneTypeLayout::emitRecord(Out, ScratchRecord, abbrCode,
(unsigned) valueKind, attrs,
S.addTypeRef(type), 0);
}
void SILSerializer::writeOneOperandLayout(SILInstructionKind valueKind,
unsigned attrs,
SILValue operand) {
auto operandType = operand->getType();
auto operandTypeRef = S.addTypeRef(operandType.getRawASTType());
auto operandRef = addValueRef(operand);
SILOneOperandLayout::emitRecord(Out, ScratchRecord,
SILAbbrCodes[SILOneOperandLayout::Code],
unsigned(valueKind), attrs,
operandTypeRef, unsigned(operandType.getCategory()),
operandRef);
}
void SILSerializer::
writeOneOperandExtraAttributeLayout(SILInstructionKind valueKind,
unsigned attrs,
SILValue operand) {
auto operandType = operand->getType();
auto operandTypeRef = S.addTypeRef(operandType.getRawASTType());
auto operandRef = addValueRef(operand);
SILOneOperandExtraAttributeLayout::emitRecord(
Out, ScratchRecord, SILAbbrCodes[SILOneOperandExtraAttributeLayout::Code],
unsigned(valueKind), attrs, operandTypeRef,
unsigned(operandType.getCategory()), operandRef);
}
void SILSerializer::writeOneTypeOneOperandLayout(SILInstructionKind valueKind,
unsigned attrs,
SILType type,
SILValue operand) {
auto typeRef = S.addTypeRef(type.getRawASTType());
auto operandType = operand->getType();
auto operandTypeRef = S.addTypeRef(operandType.getRawASTType());
auto operandRef = addValueRef(operand);
SILOneTypeOneOperandLayout::emitRecord(Out, ScratchRecord,
SILAbbrCodes[SILOneTypeOneOperandLayout::Code],
unsigned(valueKind), attrs,
typeRef, unsigned(type.getCategory()),
operandTypeRef, unsigned(operandType.getCategory()),
operandRef);
}
void SILSerializer::writeOneTypeOneOperandLayout(SILInstructionKind valueKind,
unsigned attrs,
CanType type,
SILValue operand) {
auto typeRef = S.addTypeRef(type);
auto operandType = operand->getType();
auto operandTypeRef = S.addTypeRef(operandType.getRawASTType());
auto operandRef = addValueRef(operand);
SILOneTypeOneOperandLayout::emitRecord(Out, ScratchRecord,
SILAbbrCodes[SILOneTypeOneOperandLayout::Code],
unsigned(valueKind), attrs,
typeRef, 0,
operandTypeRef, unsigned(operandType.getCategory()),
operandRef);
}
void SILSerializer::
writeOneTypeOneOperandExtraAttributeLayout(SILInstructionKind valueKind,
unsigned attrs,
SILType type,
SILValue operand) {
auto typeRef = S.addTypeRef(type.getRawASTType());
auto operandType = operand->getType();
auto operandTypeRef = S.addTypeRef(operandType.getRawASTType());
auto operandRef = addValueRef(operand);
SILOneTypeOneOperandExtraAttributeLayout::emitRecord(Out, ScratchRecord,
SILAbbrCodes[SILOneTypeOneOperandExtraAttributeLayout::Code],
unsigned(valueKind), attrs,
typeRef, unsigned(type.getCategory()),
operandTypeRef, unsigned(operandType.getCategory()),
operandRef);
}
/// Write an instruction that looks exactly like a conversion: all
/// important information is encoded in the operand and the result type.
void SILSerializer::writeConversionLikeInstruction(
const SingleValueInstruction *I, unsigned attrs) {
assert(I->getNumOperands() - I->getTypeDependentOperands().size() == 1);
writeOneTypeOneOperandLayout(I->getKind(), attrs, I->getType(),
I->getOperand(0));
}
void
SILSerializer::writeKeyPathPatternComponent(
const KeyPathPatternComponent &component,
SmallVectorImpl<uint64_t> &ListOfValues) {
auto handleComponentCommon = [&](KeyPathComponentKindEncoding kind) {
ListOfValues.push_back((unsigned)kind);
ListOfValues.push_back(S.addTypeRef(component.getComponentType()));
};
auto handleComputedId = [&](KeyPathPatternComponent::ComputedPropertyId id) {
switch (id.getKind()) {
case KeyPathPatternComponent::ComputedPropertyId::Property:
ListOfValues.push_back(
(unsigned)KeyPathComputedComponentIdKindEncoding::Property);
ListOfValues.push_back(S.addDeclRef(id.getProperty()));
break;
case KeyPathPatternComponent::ComputedPropertyId::Function:
ListOfValues.push_back(
(unsigned)KeyPathComputedComponentIdKindEncoding::Function);
ListOfValues.push_back(addSILFunctionRef(id.getFunction()));
break;
case KeyPathPatternComponent::ComputedPropertyId::DeclRef:
ListOfValues.push_back(
(unsigned)KeyPathComputedComponentIdKindEncoding::DeclRef);
handleSILDeclRef(S, id.getDeclRef(), ListOfValues);
break;
}
};
auto handleComputedExternalReferenceAndIndices
= [&](const KeyPathPatternComponent &component) {
ListOfValues.push_back(S.addDeclRef(component.getExternalDecl()));
ListOfValues.push_back(
S.addSubstitutionMapRef(component.getExternalSubstitutions()));
auto indices = component.getSubscriptIndices();
ListOfValues.push_back(indices.size());
for (auto &index : indices) {
ListOfValues.push_back(index.Operand);
ListOfValues.push_back(S.addTypeRef(index.FormalType));
ListOfValues.push_back(
S.addTypeRef(index.LoweredType.getRawASTType()));
ListOfValues.push_back((unsigned)index.LoweredType.getCategory());
ListOfValues.push_back(S.addConformanceRef(index.Hashable));
}
if (!indices.empty()) {
ListOfValues.push_back(
addSILFunctionRef(component.getSubscriptIndexEquals()));
ListOfValues.push_back(
addSILFunctionRef(component.getSubscriptIndexHash()));
}
};
switch (component.getKind()) {
case KeyPathPatternComponent::Kind::StoredProperty:
handleComponentCommon(KeyPathComponentKindEncoding::StoredProperty);
ListOfValues.push_back(S.addDeclRef(component.getStoredPropertyDecl()));
break;
case KeyPathPatternComponent::Kind::GettableProperty:
handleComponentCommon(KeyPathComponentKindEncoding::GettableProperty);
handleComputedId(component.getComputedPropertyId());
ListOfValues.push_back(
addSILFunctionRef(component.getComputedPropertyGetter()));
handleComputedExternalReferenceAndIndices(component);
break;
case KeyPathPatternComponent::Kind::SettableProperty:
handleComponentCommon(KeyPathComponentKindEncoding::SettableProperty);
handleComputedId(component.getComputedPropertyId());
ListOfValues.push_back(
addSILFunctionRef(component.getComputedPropertyGetter()));
ListOfValues.push_back(
addSILFunctionRef(component.getComputedPropertySetter()));
handleComputedExternalReferenceAndIndices(component);
break;
case KeyPathPatternComponent::Kind::OptionalChain:
handleComponentCommon(KeyPathComponentKindEncoding::OptionalChain);
break;
case KeyPathPatternComponent::Kind::OptionalForce:
handleComponentCommon(KeyPathComponentKindEncoding::OptionalForce);
break;
case KeyPathPatternComponent::Kind::OptionalWrap:
handleComponentCommon(KeyPathComponentKindEncoding::OptionalWrap);
break;
case KeyPathPatternComponent::Kind::TupleElement:
handleComponentCommon(KeyPathComponentKindEncoding::TupleElement);
ListOfValues.push_back((unsigned)component.getTupleIndex());
break;
}
}
void SILSerializer::writeSILInstruction(const SILInstruction &SI) {
PrettyStackTraceSILNode stackTrace("Serializing", &SI);
switch (SI.getKind()) {
case SILInstructionKind::ObjectInst: {
const ObjectInst *OI = cast<ObjectInst>(&SI);
unsigned abbrCode = SILAbbrCodes[SILOneTypeValuesLayout::Code];
SmallVector<ValueID, 4> Args;
Args.push_back((unsigned)OI->getBaseElements().size());
for (const Operand &op : OI->getAllOperands()) {
SILValue OpVal = op.get();
Args.push_back(addValueRef(OpVal));
SILType OpType = OpVal->getType();
assert(OpType.isObject());
Args.push_back(S.addTypeRef(OpType.getRawASTType()));
}
SILOneTypeValuesLayout::emitRecord(
Out, ScratchRecord, abbrCode, (unsigned)SI.getKind(),
S.addTypeRef(OI->getType().getRawASTType()),
(unsigned)OI->getType().getCategory(), Args);
break;
}
case SILInstructionKind::VectorInst: {
auto *vi = cast<VectorInst>(&SI);
SmallVector<ValueID, 4> ListOfValues;
for (auto Elt : vi->getElements()) {
ListOfValues.push_back(addValueRef(Elt));
}
unsigned abbrCode = SILAbbrCodes[SILOneTypeValuesLayout::Code];
SILOneTypeValuesLayout::emitRecord(Out, ScratchRecord, abbrCode,
(unsigned)SI.getKind(),
S.addTypeRef(vi->getType().getRawASTType()),
(unsigned)vi->getType().getCategory(),
ListOfValues);
break;
}
case SILInstructionKind::DebugValueInst:
case SILInstructionKind::DebugStepInst:
// Currently we don't serialize debug info, so it doesn't make
// sense to write those instructions at all.
// TODO: decide if we want to serialize those instructions.
return;
case SILInstructionKind::SpecifyTestInst:
// Instruction exists only for tests. Ignore it.
return;
case SILInstructionKind::AllocPackMetadataInst:
case SILInstructionKind::DeallocPackMetadataInst:
// Shoulud never be serialized: only introduced in an IRGen pass
// (PackMetadataMarkerInserter).
return;
case SILInstructionKind::UnwindInst:
case SILInstructionKind::ThrowAddrInst:
case SILInstructionKind::UnreachableInst: {
writeNoOperandLayout(&SI);
break;
}
case SILInstructionKind::AllocExistentialBoxInst:
case SILInstructionKind::InitExistentialAddrInst:
case SILInstructionKind::InitExistentialValueInst: