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DeserializeSIL.cpp
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//===--- DeserializeSIL.cpp - Read SIL ------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "deserialize"
#include "DeserializeSIL.h"
#include "swift/Basic/Defer.h"
#include "swift/AST/ProtocolConformance.h"
#include "swift/Serialization/ModuleFile.h"
#include "SILFormat.h"
#include "swift/SIL/SILArgument.h"
#include "swift/SIL/SILBuilder.h"
#include "swift/SIL/SILDebugScope.h"
#include "swift/SIL/SILModule.h"
#include "swift/SIL/SILUndef.h"
#include "swift/Serialization/BCReadingExtras.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Support/Debug.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;
STATISTIC(NumDeserializedFunc, "Number of deserialized SIL functions");
static Optional<StringLiteralInst::Encoding>
fromStableStringEncoding(unsigned value) {
switch (value) {
case SIL_UTF8: return StringLiteralInst::Encoding::UTF8;
case SIL_UTF16: return StringLiteralInst::Encoding::UTF16;
case SIL_OBJC_SELECTOR: return StringLiteralInst::Encoding::ObjCSelector;
default: return None;
}
}
static Optional<SILLinkage>
fromStableSILLinkage(unsigned value) {
switch (value) {
case SIL_LINKAGE_PUBLIC: return SILLinkage::Public;
case SIL_LINKAGE_HIDDEN: return SILLinkage::Hidden;
case SIL_LINKAGE_SHARED: return SILLinkage::Shared;
case SIL_LINKAGE_PRIVATE: return SILLinkage::Private;
case SIL_LINKAGE_PUBLIC_EXTERNAL: return SILLinkage::PublicExternal;
case SIL_LINKAGE_HIDDEN_EXTERNAL: return SILLinkage::HiddenExternal;
case SIL_LINKAGE_SHARED_EXTERNAL: return SILLinkage::SharedExternal;
case SIL_LINKAGE_PRIVATE_EXTERNAL: return SILLinkage::PrivateExternal;
default: return None;
}
}
/// Used to deserialize entries in the on-disk func hash table.
class SILDeserializer::FuncTableInfo {
public:
using internal_key_type = StringRef;
using external_key_type = StringRef;
using data_type = DeclID;
using hash_value_type = uint32_t;
using offset_type = unsigned;
internal_key_type GetInternalKey(external_key_type ID) { return ID; }
external_key_type GetExternalKey(internal_key_type ID) { return ID; }
hash_value_type ComputeHash(internal_key_type key) {
return llvm::HashString(key);
}
static bool EqualKey(internal_key_type lhs, internal_key_type rhs) {
return lhs == rhs;
}
static std::pair<unsigned, unsigned> ReadKeyDataLength(const uint8_t *&data) {
unsigned keyLength = endian::readNext<uint16_t, little, unaligned>(data);
unsigned dataLength = endian::readNext<uint16_t, little, unaligned>(data);
return { keyLength, dataLength };
}
static internal_key_type ReadKey(const uint8_t *data, unsigned length) {
return StringRef(reinterpret_cast<const char *>(data), length);
}
static data_type ReadData(internal_key_type key, const uint8_t *data,
unsigned length) {
assert(length == 4 && "Expect a single DeclID.");
data_type result = endian::readNext<uint32_t, little, unaligned>(data);
return result;
}
};
SILDeserializer::SILDeserializer(ModuleFile *MF, SILModule &M,
SerializedSILLoader::Callback *callback)
: MF(MF), SILMod(M), Callback(callback) {
SILCursor = MF->getSILCursor();
SILIndexCursor = MF->getSILIndexCursor();
// Early return if either sil block or sil index block does not exist.
if (SILCursor.AtEndOfStream() || SILIndexCursor.AtEndOfStream())
return;
// Load any abbrev records at the start of the block.
SILCursor.advance();
llvm::BitstreamCursor cursor = SILIndexCursor;
// We expect SIL_FUNC_NAMES first, then SIL_VTABLE_NAMES, then
// SIL_GLOBALVAR_NAMES, then SIL_WITNESS_TABLE_NAMES, and finally
// SIL_DEFAULT_WITNESS_TABLE_NAMES. But each one can be
// omitted if no entries exist in the module file.
unsigned kind = 0;
while (kind != sil_index_block::SIL_DEFAULT_WITNESS_TABLE_NAMES) {
auto next = cursor.advance();
if (next.Kind == llvm::BitstreamEntry::EndBlock)
return;
SmallVector<uint64_t, 4> scratch;
StringRef blobData;
unsigned prevKind = kind;
kind = cursor.readRecord(next.ID, scratch, &blobData);
assert((next.Kind == llvm::BitstreamEntry::Record &&
kind > prevKind &&
(kind == sil_index_block::SIL_FUNC_NAMES ||
kind == sil_index_block::SIL_VTABLE_NAMES ||
kind == sil_index_block::SIL_GLOBALVAR_NAMES ||
kind == sil_index_block::SIL_WITNESS_TABLE_NAMES ||
kind == sil_index_block::SIL_DEFAULT_WITNESS_TABLE_NAMES)) &&
"Expect SIL_FUNC_NAMES, SIL_VTABLE_NAMES, SIL_GLOBALVAR_NAMES, \
SIL_WITNESS_TABLE_NAMES, or SIL_DEFAULT_WITNESS_TABLE_NAMES.");
(void)prevKind;
if (kind == sil_index_block::SIL_FUNC_NAMES)
FuncTable = readFuncTable(scratch, blobData);
else if (kind == sil_index_block::SIL_VTABLE_NAMES)
VTableList = readFuncTable(scratch, blobData);
else if (kind == sil_index_block::SIL_GLOBALVAR_NAMES)
GlobalVarList = readFuncTable(scratch, blobData);
else if (kind == sil_index_block::SIL_WITNESS_TABLE_NAMES)
WitnessTableList = readFuncTable(scratch, blobData);
else if (kind == sil_index_block::SIL_DEFAULT_WITNESS_TABLE_NAMES)
DefaultWitnessTableList = readFuncTable(scratch, blobData);
// Read SIL_FUNC|VTABLE|GLOBALVAR_OFFSETS record.
next = cursor.advance();
scratch.clear();
unsigned offKind = cursor.readRecord(next.ID, scratch, &blobData);
(void)offKind;
if (kind == sil_index_block::SIL_FUNC_NAMES) {
assert((next.Kind == llvm::BitstreamEntry::Record &&
offKind == sil_index_block::SIL_FUNC_OFFSETS) &&
"Expect a SIL_FUNC_OFFSETS record.");
Funcs.assign(scratch.begin(), scratch.end());
} else if (kind == sil_index_block::SIL_VTABLE_NAMES) {
assert((next.Kind == llvm::BitstreamEntry::Record &&
offKind == sil_index_block::SIL_VTABLE_OFFSETS) &&
"Expect a SIL_VTABLE_OFFSETS record.");
VTables.assign(scratch.begin(), scratch.end());
} else if (kind == sil_index_block::SIL_GLOBALVAR_NAMES) {
assert((next.Kind == llvm::BitstreamEntry::Record &&
offKind == sil_index_block::SIL_GLOBALVAR_OFFSETS) &&
"Expect a SIL_GLOBALVAR_OFFSETS record.");
GlobalVars.assign(scratch.begin(), scratch.end());
} else if (kind == sil_index_block::SIL_WITNESS_TABLE_NAMES) {
assert((next.Kind == llvm::BitstreamEntry::Record &&
offKind == sil_index_block::SIL_WITNESS_TABLE_OFFSETS) &&
"Expect a SIL_WITNESS_TABLE_OFFSETS record.");
WitnessTables.assign(scratch.begin(), scratch.end());
} else if (kind == sil_index_block::SIL_DEFAULT_WITNESS_TABLE_NAMES) {
assert((next.Kind == llvm::BitstreamEntry::Record &&
offKind == sil_index_block::SIL_DEFAULT_WITNESS_TABLE_OFFSETS) &&
"Expect a SIL_DEFAULT_WITNESS_TABLE_OFFSETS record.");
DefaultWitnessTables.assign(scratch.begin(), scratch.end());
}
}
}
std::unique_ptr<SILDeserializer::SerializedFuncTable>
SILDeserializer::readFuncTable(ArrayRef<uint64_t> fields, StringRef blobData) {
uint32_t tableOffset;
sil_index_block::ListLayout::readRecord(fields, tableOffset);
auto base = reinterpret_cast<const uint8_t *>(blobData.data());
using OwnedTable = std::unique_ptr<SerializedFuncTable>;
return OwnedTable(SerializedFuncTable::Create(base + tableOffset,
base + sizeof(uint32_t), base));
}
/// A high-level overview of how forward references work in serializer and
/// deserializer:
/// In serializer, we pre-assign a value ID in order, to each basic block
/// argument and each SILInstruction that has a value.
/// In deserializer, we use LocalValues to store the definitions and
/// ForwardLocalValues for forward-referenced values (values that are
/// used but not yet defined). LocalValues are updated in setLocalValue where
/// the ID passed in assumes the same ordering as in serializer: in-order
/// for each basic block argument and each SILInstruction that has a value.
/// We update ForwardLocalValues in getLocalValue and when a value is defined
/// in setLocalValue, the corresponding entry in ForwardLocalValues will be
/// erased.
void SILDeserializer::setLocalValue(ValueBase *Value, ValueID Id) {
ValueBase *&Entry = LocalValues[Id];
assert(!Entry && "We should not redefine the same value.");
auto It = ForwardLocalValues.find(Id);
if (It != ForwardLocalValues.end()) {
// Take the information about the forward ref out of the map.
ValueBase *Placeholder = It->second;
// Remove the entries from the map.
ForwardLocalValues.erase(It);
Placeholder->replaceAllUsesWith(Value);
}
// Store it in our map.
Entry = Value;
}
SILValue SILDeserializer::getLocalValue(ValueID Id,
SILType Type) {
if (Id == 0)
return SILUndef::get(Type, &SILMod);
// Check to see if this is already defined.
ValueBase *Entry = LocalValues.lookup(Id);
if (Entry) {
// If this value was already defined, check it to make sure types match.
assert(Entry->getType() == Type && "Value Type mismatch?");
return Entry;
}
// Otherwise, this is a forward reference. Create a dummy node to represent
// it until we see a real definition.
ValueBase *&Placeholder = ForwardLocalValues[Id];
if (!Placeholder)
Placeholder = new (SILMod) GlobalAddrInst(SILDebugLocation(), Type);
return Placeholder;
}
/// Return the SILBasicBlock of a given ID.
SILBasicBlock *SILDeserializer::getBBForDefinition(SILFunction *Fn,
SILBasicBlock *Prev,
unsigned ID) {
SILBasicBlock *&BB = BlocksByID[ID];
// If the block has never been named yet, just create it.
if (BB == nullptr)
return BB = Fn->createBasicBlock(Prev);
// If it already exists, it was either a forward reference or a redefinition.
// The latter should never happen.
bool wasForwardReferenced = UndefinedBlocks.erase(BB);
assert(wasForwardReferenced);
(void)wasForwardReferenced;
if (Prev)
BB->moveAfter(Prev);
return BB;
}
/// Return the SILBasicBlock of a given ID.
SILBasicBlock *SILDeserializer::getBBForReference(SILFunction *Fn,
unsigned ID) {
SILBasicBlock *&BB = BlocksByID[ID];
if (BB != nullptr)
return BB;
// Otherwise, create it and remember that this is a forward reference
BB = Fn->createBasicBlock();
UndefinedBlocks[BB] = ID;
return BB;
}
/// Helper function to convert from Type to SILType.
static SILType getSILType(Type Ty, SILValueCategory Category) {
auto TyLoc = TypeLoc::withoutLoc(Ty);
return SILType::getPrimitiveType(TyLoc.getType()->getCanonicalType(),
Category);
}
/// Helper function to create a bogus SILFunction to appease error paths.
static SILFunction *createBogusSILFunction(SILModule &M,
StringRef name,
SILType type) {
SourceLoc loc;
return M.createFunction(
SILLinkage::Private, name, type.castTo<SILFunctionType>(), nullptr,
RegularLocation(loc), IsNotBare, IsNotTransparent, IsNotFragile,
IsNotThunk, SILFunction::NotRelevant);
}
/// Helper function to find a SILFunction, given its name and type.
SILFunction *SILDeserializer::getFuncForReference(StringRef name,
SILType type) {
// Check to see if we have a function by this name already.
SILFunction *fn = SILMod.lookUpFunction(name);
if (!fn) {
// Otherwise, look for a function with this name in the module.
auto iter = FuncTable->find(name);
if (iter != FuncTable->end()) {
fn = readSILFunction(*iter, nullptr, name, /*declarationOnly*/ true);
}
}
// FIXME: check for matching types.
// Always return something of the right type.
if (!fn) fn = createBogusSILFunction(SILMod, name, type);
return fn;
}
/// Helper function to find a SILFunction, given its name and type.
SILFunction *SILDeserializer::getFuncForReference(StringRef name) {
// Check to see if we have a function by this name already.
SILFunction *fn = SILMod.lookUpFunction(name);
if (fn)
return fn;
// Otherwise, look for a function with this name in the module.
auto iter = FuncTable->find(name);
if (iter == FuncTable->end())
return nullptr;
return readSILFunction(*iter, nullptr, name, /*declarationOnly*/ true);
}
/// Helper function to find a SILGlobalVariable given its name. It first checks
/// in the module. If we cannot find it in the module, we attempt to
/// deserialize it.
SILGlobalVariable *SILDeserializer::getGlobalForReference(StringRef name) {
// Check to see if we have a global by this name already.
if (SILGlobalVariable *g = SILMod.lookUpGlobalVariable(name))
return g;
// Otherwise, look for a global with this name in the module.
return readGlobalVar(name);
}
/// Deserialize a SILFunction if it is not already deserialized. The input
/// SILFunction can either be an empty declaration or null. If it is an empty
/// declaration, we fill in the contents. If the input SILFunction is
/// null, we create a SILFunction.
SILFunction *SILDeserializer::readSILFunction(DeclID FID,
SILFunction *existingFn,
StringRef name,
bool declarationOnly,
bool errorIfEmptyBody) {
if (FID == 0)
return nullptr;
assert(FID <= Funcs.size() && "invalid SILFunction ID");
auto &cacheEntry = Funcs[FID-1];
if (cacheEntry.isFullyDeserialized() ||
(cacheEntry.isDeserialized() && declarationOnly))
return cacheEntry.get();
BCOffsetRAII restoreOffset(SILCursor);
SILCursor.JumpToBit(cacheEntry.getOffset());
auto entry = SILCursor.advance(AF_DontPopBlockAtEnd);
if (entry.Kind == llvm::BitstreamEntry::Error) {
DEBUG(llvm::dbgs() << "Cursor advance error in readSILFunction.\n");
MF->error();
return nullptr;
}
SmallVector<uint64_t, 64> scratch;
StringRef blobData;
unsigned kind = SILCursor.readRecord(entry.ID, scratch, &blobData);
assert(kind == SIL_FUNCTION && "expect a sil function");
(void)kind;
DeclID clangNodeOwnerID;
TypeID funcTyID;
GenericEnvironmentID genericEnvID;
unsigned rawLinkage, isTransparent, isFragile, isThunk, isGlobal,
inlineStrategy, effect, numSpecAttrs, hasQualifiedOwnership;
ArrayRef<uint64_t> SemanticsIDs;
// TODO: read fragile
SILFunctionLayout::readRecord(scratch, rawLinkage, isTransparent, isFragile,
isThunk, isGlobal, inlineStrategy, effect,
numSpecAttrs, hasQualifiedOwnership, funcTyID,
genericEnvID, clangNodeOwnerID, SemanticsIDs);
if (funcTyID == 0) {
DEBUG(llvm::dbgs() << "SILFunction typeID is 0.\n");
MF->error();
return nullptr;
}
auto ty = getSILType(MF->getType(funcTyID), SILValueCategory::Object);
if (!ty.is<SILFunctionType>()) {
DEBUG(llvm::dbgs() << "not a function type for SILFunction\n");
MF->error();
return nullptr;
}
auto linkage = fromStableSILLinkage(rawLinkage);
if (!linkage) {
DEBUG(llvm::dbgs() << "invalid linkage code " << rawLinkage
<< " for SILFunction\n");
MF->error();
return nullptr;
}
ValueDecl *clangNodeOwner = nullptr;
if (clangNodeOwnerID != 0) {
clangNodeOwner = dyn_cast_or_null<ValueDecl>(MF->getDecl(clangNodeOwnerID));
if (!clangNodeOwner) {
DEBUG(llvm::dbgs() << "invalid clang node owner for SILFunction\n");
MF->error();
return nullptr;
}
}
// If we weren't handed a function, check for an existing
// declaration in the output module.
if (!existingFn) existingFn = SILMod.lookUpFunction(name);
auto fn = existingFn;
// TODO: use the correct SILLocation from module.
SILLocation loc = RegularLocation(SourceLoc());
// If we have an existing function, verify that the types match up.
if (fn) {
if (fn->getLoweredType() != ty) {
DEBUG(llvm::dbgs() << "SILFunction type mismatch.\n");
MF->error();
return nullptr;
}
if (isFragile)
fn->setFragile(IsFragile);
// Don't override the transparency or linkage of a function with
// an existing declaration.
// Otherwise, create a new function.
} else {
fn = SILMod.createFunction(
linkage.getValue(), name, ty.castTo<SILFunctionType>(), nullptr, loc,
IsNotBare, IsTransparent_t(isTransparent == 1),
IsFragile_t(isFragile == 1), IsThunk_t(isThunk),
SILFunction::NotRelevant, (Inline_t)inlineStrategy);
fn->setGlobalInit(isGlobal == 1);
fn->setEffectsKind((EffectsKind)effect);
if (clangNodeOwner)
fn->setClangNodeOwner(clangNodeOwner);
for (auto ID : SemanticsIDs) {
fn->addSemanticsAttr(MF->getIdentifier(ID).str());
}
if (Callback) Callback->didDeserialize(MF->getAssociatedModule(), fn);
}
assert(fn->empty() &&
"SILFunction to be deserialized starts being empty.");
fn->setBare(IsBare);
const SILDebugScope *DS = fn->getDebugScope();
if (!DS) {
DS = new (SILMod) SILDebugScope(loc, fn);
fn->setDebugScope(DS);
}
// Read and instantiate the specialize attributes.
while (numSpecAttrs--) {
auto next = SILCursor.advance(AF_DontPopBlockAtEnd);
assert(next.Kind == llvm::BitstreamEntry::Record);
scratch.clear();
kind = SILCursor.readRecord(next.ID, scratch);
assert(kind == SIL_SPECIALIZE_ATTR && "Missing specialization attribute");
unsigned exported;
unsigned specializationKindVal;
SILSpecializeAttrLayout::readRecord(scratch, exported, specializationKindVal);
SILSpecializeAttr::SpecializationKind specializationKind =
specializationKindVal ? SILSpecializeAttr::SpecializationKind::Partial
: SILSpecializeAttr::SpecializationKind::Full;
SmallVector<Requirement, 8> requirements;
MF->readGenericRequirements(requirements, SILCursor);
// Read the substitution list and construct a SILSpecializeAttr.
fn->addSpecializeAttr(SILSpecializeAttr::create(
SILMod, requirements, exported != 0, specializationKind));
}
GenericEnvironment *genericEnv = nullptr;
if (!declarationOnly)
genericEnv = MF->getGenericEnvironment(genericEnvID);
// If the next entry is the end of the block, then this function has
// no contents.
entry = SILCursor.advance(AF_DontPopBlockAtEnd);
bool isEmptyFunction = (entry.Kind == llvm::BitstreamEntry::EndBlock);
assert((!isEmptyFunction || !genericEnv) &&
"generic environment without body?!");
// Remember this in our cache in case it's a recursive function.
// Increase the reference count to keep it alive.
bool isFullyDeserialized = (isEmptyFunction || !declarationOnly);
if (cacheEntry.isDeserialized()) {
assert(fn == cacheEntry.get() && "changing SIL function during deserialization!");
} else {
fn->incrementRefCount();
}
cacheEntry.set(fn, isFullyDeserialized);
// Stop here if we have nothing else to do.
if (isEmptyFunction || declarationOnly) {
return fn;
}
if (!hasQualifiedOwnership)
fn->setUnqualifiedOwnership();
NumDeserializedFunc++;
assert(!(fn->getGenericEnvironment() && !fn->empty())
&& "function already has context generic params?!");
if (genericEnv)
fn->setGenericEnvironment(genericEnv);
scratch.clear();
kind = SILCursor.readRecord(entry.ID, scratch);
SILBasicBlock *CurrentBB = nullptr;
// Clear up at the beginning of each SILFunction.
BasicBlockID = 0;
BlocksByID.clear();
UndefinedBlocks.clear();
LastValueID = 0;
LocalValues.clear();
ForwardLocalValues.clear();
SILOpenedArchetypesTracker OpenedArchetypesTracker(*fn);
SILBuilder Builder(*fn);
// Track the archetypes just like SILGen. This
// is required for adding typedef operands to instructions.
Builder.setOpenedArchetypesTracker(&OpenedArchetypesTracker);
// Define a callback to be invoked on the deserialized types.
auto OldDeserializedTypeCallback = MF->DeserializedTypeCallback;
SWIFT_DEFER {
MF->DeserializedTypeCallback = OldDeserializedTypeCallback;
};
MF->DeserializedTypeCallback = [&OpenedArchetypesTracker] (Type ty) {
OpenedArchetypesTracker.registerUsedOpenedArchetypes(ty);
};
// Another SIL_FUNCTION record means the end of this SILFunction.
// SIL_VTABLE or SIL_GLOBALVAR or SIL_WITNESS_TABLE record also means the end
// of this SILFunction.
while (kind != SIL_FUNCTION && kind != SIL_VTABLE && kind != SIL_GLOBALVAR &&
kind != SIL_WITNESS_TABLE) {
if (kind == SIL_BASIC_BLOCK)
// Handle a SILBasicBlock record.
CurrentBB = readSILBasicBlock(fn, CurrentBB, scratch);
else {
// If CurrentBB is empty, just return fn. The code in readSILInstruction
// assumes that such a situation means that fn is a declaration. Thus it
// is using return false to mean two different things, error a failure
// occurred and this is a declaration. Work around that for now.
if (!CurrentBB)
return fn;
// Handle a SILInstruction record.
if (readSILInstruction(fn, CurrentBB, Builder, kind, scratch)) {
DEBUG(llvm::dbgs() << "readSILInstruction returns error.\n");
MF->error();
return fn;
}
}
// Fetch the next record.
scratch.clear();
entry = SILCursor.advance(AF_DontPopBlockAtEnd);
// EndBlock means the end of this SILFunction.
if (entry.Kind == llvm::BitstreamEntry::EndBlock)
break;
kind = SILCursor.readRecord(entry.ID, scratch);
}
// If fn is empty, we failed to deserialize its body. Return nullptr to signal
// error.
if (fn->empty() && errorIfEmptyBody)
return nullptr;
// Check that there are no unresolved forward definitions of opened
// archetypes.
if (OpenedArchetypesTracker.hasUnresolvedOpenedArchetypeDefinitions())
llvm_unreachable(
"All forward definitions of opened archetypes should be resolved");
if (Callback)
Callback->didDeserializeFunctionBody(MF->getAssociatedModule(), fn);
return fn;
}
// 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<SILValueCategory>::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<ValueOwnershipKind::innerty>::type,
uint8_t>::value,
"Expected an underlying uint8_t type");
SILBasicBlock *SILDeserializer::readSILBasicBlock(SILFunction *Fn,
SILBasicBlock *Prev,
SmallVectorImpl<uint64_t> &scratch) {
ArrayRef<uint64_t> Args;
SILBasicBlockLayout::readRecord(scratch, Args);
// Args should be a list of triples of the following form:
//
// 1. A TypeID.
// 2. A flag of metadata. This currently includes the SILValueCategory and
// ValueOwnershipKind. We enforce size constraints of these types above.
// 3. A ValueID.
SILBasicBlock *CurrentBB = getBBForDefinition(Fn, Prev, BasicBlockID++);
bool IsEntry = CurrentBB->isEntry();
for (unsigned I = 0, E = Args.size(); I < E; I += 3) {
TypeID TyID = Args[I];
if (!TyID) return nullptr;
ValueID ValId = Args[I+2];
if (!ValId) return nullptr;
auto ArgTy = MF->getType(TyID);
SILArgument *Arg;
auto ValueCategory = SILValueCategory(Args[I + 1] & 0xF);
SILType SILArgTy = getSILType(ArgTy, ValueCategory);
if (IsEntry) {
Arg = CurrentBB->createFunctionArgument(SILArgTy);
} else {
auto OwnershipKind = ValueOwnershipKind((Args[I + 1] >> 8) & 0xF);
Arg = CurrentBB->createPHIArgument(SILArgTy, OwnershipKind);
}
LastValueID = LastValueID + 1;
setLocalValue(Arg, LastValueID);
}
return CurrentBB;
}
static CastConsumptionKind getCastConsumptionKind(unsigned attr) {
switch (attr) {
case SIL_CAST_CONSUMPTION_TAKE_ALWAYS:
return CastConsumptionKind::TakeAlways;
case SIL_CAST_CONSUMPTION_TAKE_ON_SUCCESS:
return CastConsumptionKind::TakeOnSuccess;
case SIL_CAST_CONSUMPTION_COPY_ON_SUCCESS:
return CastConsumptionKind::CopyOnSuccess;
default:
llvm_unreachable("not a valid CastConsumptionKind for SIL");
}
}
/// Construct a SILDeclRef from ListOfValues.
static SILDeclRef getSILDeclRef(ModuleFile *MF,
ArrayRef<uint64_t> ListOfValues,
unsigned &NextIdx) {
assert(ListOfValues.size() >= NextIdx+5 &&
"Expect 5 numbers for SILDeclRef");
SILDeclRef DRef(cast<ValueDecl>(MF->getDecl(ListOfValues[NextIdx])),
(SILDeclRef::Kind)ListOfValues[NextIdx+1],
(ResilienceExpansion)ListOfValues[NextIdx+2],
ListOfValues[NextIdx+3], ListOfValues[NextIdx+4] > 0);
NextIdx += 5;
return DRef;
}
bool SILDeserializer::readSILInstruction(SILFunction *Fn, SILBasicBlock *BB,
SILBuilder &Builder,
unsigned RecordKind,
SmallVectorImpl<uint64_t> &scratch) {
// Return error if Basic Block is null.
if (!BB)
return true;
Builder.setInsertionPoint(BB);
Builder.setCurrentDebugScope(Fn->getDebugScope());
unsigned OpCode = 0, TyCategory = 0, TyCategory2 = 0, TyCategory3 = 0,
Attr = 0, NumSubs = 0, NumConformances = 0, IsNonThrowingApply = 0;
ValueID ValID, ValID2, ValID3;
TypeID TyID, TyID2, TyID3;
TypeID ConcreteTyID;
ModuleID OwningModuleID;
SourceLoc SLoc;
ArrayRef<uint64_t> ListOfValues;
SILLocation Loc = RegularLocation(SLoc);
switch (RecordKind) {
default:
llvm_unreachable("Record kind for a SIL instruction is not supported.");
case SIL_ONE_VALUE_ONE_OPERAND:
SILOneValueOneOperandLayout::readRecord(scratch, OpCode, Attr,
ValID, TyID, TyCategory,
ValID2);
break;
case SIL_ONE_TYPE:
SILOneTypeLayout::readRecord(scratch, OpCode, TyID, TyCategory);
break;
case SIL_ONE_OPERAND:
SILOneOperandLayout::readRecord(scratch, OpCode, Attr,
TyID, TyCategory, ValID);
break;
case SIL_ONE_TYPE_ONE_OPERAND:
SILOneTypeOneOperandLayout::readRecord(scratch, OpCode, Attr,
TyID, TyCategory,
TyID2, TyCategory2,
ValID);
break;
case SIL_INIT_EXISTENTIAL:
SILInitExistentialLayout::readRecord(scratch, OpCode,
TyID, TyCategory,
TyID2, TyCategory2,
ValID,
ConcreteTyID,
NumConformances);
break;
case SIL_INST_CAST:
SILInstCastLayout::readRecord(scratch, OpCode, Attr,
TyID, TyCategory,
TyID2, TyCategory2,
ValID);
break;
case SIL_ONE_TYPE_VALUES:
SILOneTypeValuesLayout::readRecord(scratch, OpCode, TyID, TyCategory,
ListOfValues);
break;
case SIL_TWO_OPERANDS:
SILTwoOperandsLayout::readRecord(scratch, OpCode, Attr,
TyID, TyCategory, ValID,
TyID2, TyCategory2, ValID2);
break;
case SIL_TAIL_ADDR:
SILTailAddrLayout::readRecord(scratch, OpCode,
TyID, ValID,
TyID2, ValID2,
TyID3);
break;
case SIL_INST_APPLY: {
unsigned IsPartial;
SILInstApplyLayout::readRecord(scratch, IsPartial, NumSubs,
TyID, TyID2, ValID, ListOfValues);
switch (IsPartial) {
case SIL_APPLY:
OpCode = (unsigned)ValueKind::ApplyInst;
break;
case SIL_PARTIAL_APPLY:
OpCode = (unsigned)ValueKind::PartialApplyInst;
break;
case SIL_BUILTIN:
OpCode = (unsigned)ValueKind::BuiltinInst;
break;
case SIL_TRY_APPLY:
OpCode = (unsigned)ValueKind::TryApplyInst;
break;
case SIL_NON_THROWING_APPLY:
OpCode = (unsigned)ValueKind::ApplyInst;
IsNonThrowingApply = true;
break;
default:
llvm_unreachable("unexpected apply inst kind");
}
break;
}
case SIL_INST_NO_OPERAND:
SILInstNoOperandLayout::readRecord(scratch, OpCode);
break;
case SIL_INST_WITNESS_METHOD:
SILInstWitnessMethodLayout::readRecord(
scratch, TyID, TyCategory, Attr, TyID2, TyCategory2, TyID3,
TyCategory3, ValID3, ListOfValues);
OpCode = (unsigned)ValueKind::WitnessMethodInst;
break;
}
SILInstruction *ResultVal;
switch ((ValueKind)OpCode) {
case ValueKind::SILPHIArgument:
case ValueKind::SILFunctionArgument:
case ValueKind::SILUndef:
llvm_unreachable("not an instruction");
case ValueKind::DebugValueInst:
case ValueKind::DebugValueAddrInst:
llvm_unreachable("not supported");
case ValueKind::AllocBoxInst:
assert(RecordKind == SIL_ONE_TYPE && "Layout should be OneType.");
ResultVal = Builder.createAllocBox(Loc,
cast<SILBoxType>(MF->getType(TyID)->getCanonicalType()));
break;
#define ONETYPE_INST(ID) \
case ValueKind::ID##Inst: \
assert(RecordKind == SIL_ONE_TYPE && "Layout should be OneType."); \
ResultVal = Builder.create##ID(Loc, \
getSILType(MF->getType(TyID), (SILValueCategory)TyCategory));\
break;
ONETYPE_INST(AllocStack)
ONETYPE_INST(Metatype)
#undef ONETYPE_INST
#define ONETYPE_ONEOPERAND_INST(ID) \
case ValueKind::ID##Inst: \
assert(RecordKind == SIL_ONE_TYPE_ONE_OPERAND && \
"Layout should be OneTypeOneOperand."); \
ResultVal = Builder.create##ID(Loc, \
getSILType(MF->getType(TyID), (SILValueCategory)TyCategory), \
getLocalValue(ValID, \
getSILType(MF->getType(TyID2), \
(SILValueCategory)TyCategory2))); \
break;
ONETYPE_ONEOPERAND_INST(ValueMetatype)
ONETYPE_ONEOPERAND_INST(ExistentialMetatype)
ONETYPE_ONEOPERAND_INST(AllocValueBuffer)
ONETYPE_ONEOPERAND_INST(ProjectValueBuffer)
ONETYPE_ONEOPERAND_INST(ProjectExistentialBox)
ONETYPE_ONEOPERAND_INST(DeallocValueBuffer)
#undef ONETYPE_ONEOPERAND_INST
case ValueKind::DeallocBoxInst:
assert(RecordKind == SIL_ONE_TYPE_ONE_OPERAND &&
"Layout should be OneTypeOneOperand.");
ResultVal = Builder.createDeallocBox(Loc,
getLocalValue(ValID,
getSILType(MF->getType(TyID2),
(SILValueCategory)TyCategory2)));
break;
case ValueKind::OpenExistentialAddrInst:
assert(RecordKind == SIL_ONE_TYPE_ONE_OPERAND &&
"Layout should be OneTypeOneOperand.");
ResultVal = Builder.createOpenExistentialAddr(
Loc, getLocalValue(ValID, getSILType(MF->getType(TyID2),
(SILValueCategory)TyCategory2)),
getSILType(MF->getType(TyID), (SILValueCategory)TyCategory),
Attr == 0 ? OpenedExistentialAccess::Immutable
: OpenedExistentialAccess::Mutable);
break;
#define ONEOPERAND_ONETYPE_INST(ID) \
case ValueKind::ID##Inst: \
assert(RecordKind == SIL_ONE_TYPE_ONE_OPERAND && \
"Layout should be OneTypeOneOperand."); \
ResultVal = Builder.create##ID(Loc, \
getLocalValue(ValID, \
getSILType(MF->getType(TyID2), \
(SILValueCategory)TyCategory2)), \
getSILType(MF->getType(TyID), (SILValueCategory)TyCategory));\
break;
ONEOPERAND_ONETYPE_INST(OpenExistentialRef)
ONEOPERAND_ONETYPE_INST(OpenExistentialMetatype)
ONEOPERAND_ONETYPE_INST(OpenExistentialBox)
ONEOPERAND_ONETYPE_INST(OpenExistentialOpaque)
// Conversion instructions.
ONEOPERAND_ONETYPE_INST(UncheckedRefCast)
ONEOPERAND_ONETYPE_INST(UncheckedAddrCast)
ONEOPERAND_ONETYPE_INST(UncheckedTrivialBitCast)
ONEOPERAND_ONETYPE_INST(UncheckedBitwiseCast)
ONEOPERAND_ONETYPE_INST(BridgeObjectToRef)
ONEOPERAND_ONETYPE_INST(BridgeObjectToWord)
ONEOPERAND_ONETYPE_INST(Upcast)
ONEOPERAND_ONETYPE_INST(AddressToPointer)
ONEOPERAND_ONETYPE_INST(RefToRawPointer)
ONEOPERAND_ONETYPE_INST(RawPointerToRef)
ONEOPERAND_ONETYPE_INST(RefToUnowned)
ONEOPERAND_ONETYPE_INST(UnownedToRef)
ONEOPERAND_ONETYPE_INST(RefToUnmanaged)
ONEOPERAND_ONETYPE_INST(UnmanagedToRef)
ONEOPERAND_ONETYPE_INST(ThinToThickFunction)
ONEOPERAND_ONETYPE_INST(ThickToObjCMetatype)
ONEOPERAND_ONETYPE_INST(ObjCToThickMetatype)
ONEOPERAND_ONETYPE_INST(ObjCMetatypeToObject)
ONEOPERAND_ONETYPE_INST(ObjCExistentialMetatypeToObject)
ONEOPERAND_ONETYPE_INST(ConvertFunction)
ONEOPERAND_ONETYPE_INST(ThinFunctionToPointer)
ONEOPERAND_ONETYPE_INST(PointerToThinFunction)
ONEOPERAND_ONETYPE_INST(ProjectBlockStorage)
#undef ONEOPERAND_ONETYPE_INST
case ValueKind::ProjectBoxInst: {
assert(RecordKind == SIL_ONE_TYPE_ONE_OPERAND &&
"Layout should be OneTypeOneOperand.");
ResultVal = Builder.createProjectBox(Loc,
getLocalValue(ValID,
getSILType(MF->getType(TyID2),
(SILValueCategory)TyCategory2)),
TyID);
break;
}
case ValueKind::PointerToAddressInst: {
assert(RecordKind == SIL_ONE_TYPE_ONE_OPERAND &&
"Layout should be OneTypeOneOperand.");
bool isStrict = Attr & 0x01;
ResultVal = Builder.createPointerToAddress(
Loc,
getLocalValue(ValID, getSILType(MF->getType(TyID2),
(SILValueCategory)TyCategory2)),
getSILType(MF->getType(TyID), (SILValueCategory)TyCategory),
isStrict);
break;
}
case ValueKind::DeallocExistentialBoxInst: {
assert(RecordKind == SIL_ONE_TYPE_ONE_OPERAND &&
"Layout should be OneTypeOneOperand.");
ResultVal = Builder.createDeallocExistentialBox(Loc,
MF->getType(TyID)->getCanonicalType(),
getLocalValue(ValID,
getSILType(MF->getType(TyID2),
(SILValueCategory)TyCategory2)));
break;
}
case ValueKind::RefToBridgeObjectInst: {
auto RefTy = getSILType(MF->getType(TyID), (SILValueCategory)TyCategory);
auto Ref = getLocalValue(ValID, RefTy);
auto BitsTy = getSILType(MF->getType(TyID2), (SILValueCategory)TyCategory2);
auto Bits = getLocalValue(ValID2, BitsTy);
ResultVal = Builder.createRefToBridgeObject(Loc, Ref, Bits);
break;
}
case ValueKind::ObjCProtocolInst: {
auto Ty = getSILType(MF->getType(TyID), (SILValueCategory)TyCategory);
auto Proto = MF->getDecl(ValID);
ResultVal = Builder.createObjCProtocol(Loc, cast<ProtocolDecl>(Proto), Ty);
break;
}
case ValueKind::InitExistentialAddrInst:
case ValueKind::InitExistentialOpaqueInst:
case ValueKind::InitExistentialMetatypeInst:
case ValueKind::InitExistentialRefInst:
case ValueKind::AllocExistentialBoxInst: {
auto Ty = getSILType(MF->getType(TyID), (SILValueCategory)TyCategory);
auto Ty2 = MF->getType(TyID2);
CanType ConcreteTy;
if ((ValueKind) OpCode != ValueKind::InitExistentialMetatypeInst)
ConcreteTy = MF->getType(ConcreteTyID)->getCanonicalType();
SILValue operand;
if ((ValueKind) OpCode != ValueKind::AllocExistentialBoxInst)
operand = getLocalValue(ValID,
getSILType(Ty2, (SILValueCategory)TyCategory2));
SmallVector<ProtocolConformanceRef, 2> conformances;
while (NumConformances--) {
auto conformance = MF->readConformance(SILCursor);
conformances.push_back(conformance);
}
auto ctxConformances = MF->getContext().AllocateCopy(conformances);
switch ((ValueKind)OpCode) {
default: llvm_unreachable("Out of sync with parent switch");
case ValueKind::InitExistentialAddrInst:
ResultVal = Builder.createInitExistentialAddr(Loc, operand,
ConcreteTy,
Ty,
ctxConformances);
break;
case ValueKind::InitExistentialOpaqueInst:
ResultVal = Builder.createInitExistentialOpaque(Loc, Ty, ConcreteTy,
operand, ctxConformances);
break;
case ValueKind::InitExistentialMetatypeInst:
ResultVal = Builder.createInitExistentialMetatype(Loc, operand, Ty,
ctxConformances);
break;
case ValueKind::InitExistentialRefInst:
ResultVal = Builder.createInitExistentialRef(Loc, Ty,
ConcreteTy,
operand,
ctxConformances);
break;
case ValueKind::AllocExistentialBoxInst:
ResultVal = Builder.createAllocExistentialBox(Loc, Ty, ConcreteTy,