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ParseSIL.cpp
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//===--- ParseSIL.cpp - SIL File Parsing logic ----------------------------===//
//
// 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 "swift/AST/ASTWalker.h"
#include "swift/AST/GenericEnvironment.h"
#include "swift/AST/NameLookup.h"
#include "swift/AST/ProtocolConformance.h"
#include "swift/Basic/Defer.h"
#include "swift/Parse/Lexer.h"
#include "swift/Parse/Parser.h"
#include "swift/SIL/AbstractionPattern.h"
#include "swift/SIL/InstructionUtils.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/Subsystems.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/Support/SaveAndRestore.h"
using namespace swift;
//===----------------------------------------------------------------------===//
// SILParserState implementation
//===----------------------------------------------------------------------===//
namespace swift {
class SILParserTUState {
public:
SILParserTUState(SILModule &M) : M(M) {}
~SILParserTUState();
SILModule &M;
/// This is all of the forward referenced functions with
/// the location for where the reference is.
llvm::DenseMap<Identifier,
std::pair<SILFunction*, SourceLoc>> ForwardRefFns;
/// A list of all functions forward-declared by a sil_scope.
llvm::DenseSet<SILFunction *> PotentialZombieFns;
/// A map from textual .sil scope number to SILDebugScopes.
llvm::DenseMap<unsigned, SILDebugScope *> ScopeSlots;
/// Did we parse a sil_stage for this module?
bool DidParseSILStage = false;
DiagnosticEngine *Diags = nullptr;
};
} // namespace swift
SILParserState::SILParserState(SILModule *M) : M(M) {
S = M ? new SILParserTUState(*M) : nullptr;
}
SILParserState::~SILParserState() {
delete S;
}
SILParserTUState::~SILParserTUState() {
if (!ForwardRefFns.empty())
for (auto Entry : ForwardRefFns)
if (Entry.second.second.isValid())
Diags->diagnose(Entry.second.second, diag::sil_use_of_undefined_value,
Entry.first.str());
// Turn any debug-info-only function declarations into zombies.
for (auto *Fn : PotentialZombieFns)
if (Fn->isExternalDeclaration()) {
Fn->setInlined();
M.eraseFunction(Fn);
}
}
//===----------------------------------------------------------------------===//
// SILParser
//===----------------------------------------------------------------------===//
namespace {
struct ParsedSubstitution {
SourceLoc loc;
Type replacement;
};
struct ParsedSpecAttr {
ArrayRef<RequirementRepr> requirements;
bool exported;
SILSpecializeAttr::SpecializationKind kind;
};
class SILParser {
friend Parser;
public:
Parser &P;
SILModule &SILMod;
SILParserTUState &TUState;
SILFunction *F = nullptr;
GenericEnvironment *GenericEnv = nullptr;
FunctionOwnershipEvaluator OwnershipEvaluator;
private:
/// HadError - Have we seen an error parsing this function?
bool HadError = false;
/// Data structures used to perform name lookup of basic blocks.
llvm::DenseMap<Identifier, SILBasicBlock*> BlocksByName;
llvm::DenseMap<SILBasicBlock*,
std::pair<SourceLoc, Identifier>> UndefinedBlocks;
/// Data structures used to perform name lookup for local values.
llvm::StringMap<ValueBase*> LocalValues;
llvm::StringMap<SourceLoc> ForwardRefLocalValues;
/// A callback to be invoked every time a type was deserialized.
std::function<void(Type)> ParsedTypeCallback;
bool performTypeLocChecking(TypeLoc &T, bool IsSILType,
GenericEnvironment *GenericEnv = nullptr,
DeclContext *DC = nullptr);
void convertRequirements(SILFunction *F, ArrayRef<RequirementRepr> From,
SmallVectorImpl<Requirement> &To);
ProtocolConformance *
parseProtocolConformanceHelper(ProtocolDecl *&proto,
GenericEnvironment *GenericEnv,
bool localScope);
public:
SILParser(Parser &P)
: P(P), SILMod(*P.SIL->M), TUState(*P.SIL->S),
ParsedTypeCallback([](Type ty) {}) {}
/// diagnoseProblems - After a function is fully parse, emit any diagnostics
/// for errors and return true if there were any.
bool diagnoseProblems();
/// getGlobalNameForReference - Given a reference to a global name, look it
/// up and return an appropriate SIL function.
SILFunction *getGlobalNameForReference(Identifier Name,
CanSILFunctionType Ty,
SourceLoc Loc,
bool IgnoreFwdRef = false);
/// getGlobalNameForDefinition - Given a definition of a global name, look
/// it up and return an appropriate SIL function.
SILFunction *getGlobalNameForDefinition(Identifier Name,
CanSILFunctionType Ty,
SourceLoc Loc);
/// getBBForDefinition - Return the SILBasicBlock for a definition of the
/// specified block.
SILBasicBlock *getBBForDefinition(Identifier Name, SourceLoc Loc);
/// getBBForReference - return the SILBasicBlock of the specified name. The
/// source location is used to diagnose a failure if the block ends up never
/// being defined.
SILBasicBlock *getBBForReference(Identifier Name, SourceLoc Loc);
struct UnresolvedValueName {
StringRef Name;
SourceLoc NameLoc;
bool isUndef() const { return Name == "undef"; }
};
/// getLocalValue - Get a reference to a local value with the specified name
/// and type.
SILValue getLocalValue(UnresolvedValueName Name, SILType Type,
SILLocation L, SILBuilder &B);
/// setLocalValue - When an instruction or block argument is defined, this
/// method is used to register it and update our symbol table.
void setLocalValue(ValueBase *Value, StringRef Name, SourceLoc NameLoc);
SILDebugLocation getDebugLoc(SILBuilder & B, SILLocation Loc) {
return SILDebugLocation(Loc, F->getDebugScope());
}
/// @{ Primitive parsing.
/// \verbatim
/// sil-identifier ::= [A-Za-z_0-9]+
/// \endverbatim
bool parseSILIdentifier(Identifier &Result, SourceLoc &Loc,
const Diagnostic &D);
template<typename ...DiagArgTypes, typename ...ArgTypes>
bool parseSILIdentifier(Identifier &Result, Diag<DiagArgTypes...> ID,
ArgTypes... Args) {
SourceLoc L;
return parseSILIdentifier(Result, L, Diagnostic(ID, Args...));
}
template<typename ...DiagArgTypes, typename ...ArgTypes>
bool parseSILIdentifier(Identifier &Result, SourceLoc &L,
Diag<DiagArgTypes...> ID, ArgTypes... Args) {
return parseSILIdentifier(Result, L, Diagnostic(ID, Args...));
}
bool parseVerbatim(StringRef identifier);
template <typename T> bool parseInteger(T &Result, const Diagnostic &D) {
if (!P.Tok.is(tok::integer_literal)) {
P.diagnose(P.Tok, D);
return true;
}
P.Tok.getText().getAsInteger(0, Result);
P.consumeToken(tok::integer_literal);
return false;
}
/// @}
/// @{ Type parsing.
bool parseASTType(CanType &result);
bool parseASTType(CanType &result, SourceLoc &TypeLoc) {
TypeLoc = P.Tok.getLoc();
return parseASTType(result);
}
bool parseSILOwnership(Optional<ValueOwnershipKind> &OwnershipKind) {
// We pare here @ <identifier>.
if (P.consumeIf(tok::at_sign) && P.Tok.isNot(tok::identifier)) {
// Add error here.
return true;
}
OwnershipKind =
llvm::StringSwitch<Optional<ValueOwnershipKind>>(P.Tok.getText())
.Case("trivial",
Optional<ValueOwnershipKind>(ValueOwnershipKind::Trivial))
.Case("unowned",
Optional<ValueOwnershipKind>(ValueOwnershipKind::Unowned))
.Case("owned",
Optional<ValueOwnershipKind>(ValueOwnershipKind::Owned))
.Case("guaranteed", Optional<ValueOwnershipKind>(
ValueOwnershipKind::Guaranteed))
.Default(None);
if (OwnershipKind.hasValue()) {
P.consumeToken();
return false;
}
return true;
}
bool parseSILType(SILType &Result,
GenericEnvironment *&genericEnv,
bool IsFuncDecl = false);
bool parseSILType(SILType &Result) {
GenericEnvironment *IgnoredEnv;
return parseSILType(Result, IgnoredEnv);
}
bool parseSILType(SILType &Result, SourceLoc &TypeLoc) {
TypeLoc = P.Tok.getLoc();
return parseSILType(Result);
}
bool parseSILType(SILType &Result, SourceLoc &TypeLoc,
GenericEnvironment *&GenericEnv) {
TypeLoc = P.Tok.getLoc();
return parseSILType(Result, GenericEnv);
}
/// @}
bool parseSILDottedPath(ValueDecl *&Decl,
SmallVectorImpl<ValueDecl *> &values);
bool parseSILDottedPath(ValueDecl *&Decl) {
SmallVector<ValueDecl *, 4> values;
return parseSILDottedPath(Decl, values);
}
bool parseSILDottedPathWithoutPound(ValueDecl *&Decl,
SmallVectorImpl<ValueDecl *> &values);
bool parseSILDottedPathWithoutPound(ValueDecl *&Decl) {
SmallVector<ValueDecl *, 4> values;
return parseSILDottedPathWithoutPound(Decl, values);
}
/// At the time of calling this function, we may not have the type of the
/// Decl yet. So we return a SILDeclRef on the first lookup result and also
/// return all the lookup results. After parsing the expected type, the
/// caller of this function can choose the one that has the expected type.
bool parseSILDeclRef(SILDeclRef &Result,
SmallVectorImpl<ValueDecl *> &values);
bool parseSILDeclRef(SILDeclRef &Result) {
SmallVector<ValueDecl *, 4> values;
return parseSILDeclRef(Result, values);
}
bool parseSILDeclRef(SILDeclRef &Member, bool FnTypeRequired);
bool parseGlobalName(Identifier &Name);
bool parseValueName(UnresolvedValueName &Name);
bool parseValueRef(SILValue &Result, SILType Ty, SILLocation Loc,
SILBuilder &B);
bool parseTypedValueRef(SILValue &Result, SourceLoc &Loc, SILBuilder &B);
bool parseTypedValueRef(SILValue &Result, SILBuilder &B) {
SourceLoc Tmp;
return parseTypedValueRef(Result, Tmp, B);
}
bool parseSILOpcode(ValueKind &Opcode, SourceLoc &OpcodeLoc,
StringRef &OpcodeName);
bool parseSILDebugVar(SILDebugVariable &Var);
/// \brief Parses the basic block arguments as part of branch instruction.
bool parseSILBBArgsAtBranch(SmallVector<SILValue, 6> &Args, SILBuilder &B);
bool parseSILLocation(SILLocation &L);
bool parseScopeRef(SILDebugScope *&DS);
bool parseSILDebugLocation(SILLocation &L, SILBuilder &B,
bool parsedComma = false);
bool parseSILInstruction(SILBasicBlock *BB, SILBuilder &B);
bool parseCallInstruction(SILLocation InstLoc,
ValueKind Opcode, SILBuilder &B,
SILInstruction *&ResultVal);
bool parseSILFunctionRef(SILLocation InstLoc,
SILBuilder &B, SILInstruction *&ResultVal);
bool parseSILBasicBlock(SILBuilder &B);
bool isStartOfSILInstruction();
bool parseSubstitutions(SmallVectorImpl<ParsedSubstitution> &parsed,
GenericEnvironment *GenericEnv=nullptr);
ProtocolConformance *parseProtocolConformance(ProtocolDecl *&proto,
GenericEnvironment *&genericEnv,
bool localScope);
ProtocolConformance *parseProtocolConformance() {
ProtocolDecl *dummy;
GenericEnvironment *env;
return parseProtocolConformance(dummy, env, true);
}
Optional<llvm::coverage::Counter>
parseSILCoverageExpr(llvm::coverage::CounterExpressionBuilder &Builder);
};
} // end anonymous namespace
bool SILParser::parseSILIdentifier(Identifier &Result, SourceLoc &Loc,
const Diagnostic &D) {
switch (P.Tok.getKind()) {
case tok::identifier:
Result = P.Context.getIdentifier(P.Tok.getText());
break;
case tok::string_literal: {
// Drop the double quotes.
StringRef rawString = P.Tok.getText().drop_front().drop_back();
Result = P.Context.getIdentifier(rawString);
break;
}
case tok::oper_binary_unspaced: // fixme?
case tok::oper_binary_spaced:
// A binary operator can be part of a SILDeclRef.
Result = P.Context.getIdentifier(P.Tok.getText());
break;
case tok::kw_deinit:
Result = P.Context.Id_deinit;
break;
case tok::kw_init:
Result = P.Context.Id_init;
break;
case tok::kw_subscript:
Result = P.Context.Id_subscript;
break;
default:
// If it's some other keyword, grab an identifier for it.
if (P.Tok.isKeyword()) {
Result = P.Context.getIdentifier(P.Tok.getText());
break;
}
P.diagnose(P.Tok, D);
return true;
}
Loc = P.Tok.getLoc();
P.consumeToken();
return false;
}
bool SILParser::parseVerbatim(StringRef name) {
Identifier tok;
SourceLoc loc;
if (parseSILIdentifier(tok, loc, diag::expected_tok_in_sil_instr, name)) {
return true;
}
if (tok.str() != name) {
P.diagnose(loc, diag::expected_tok_in_sil_instr, name);
return true;
}
return false;
}
/// diagnoseProblems - After a function is fully parse, emit any diagnostics
/// for errors and return true if there were any.
bool SILParser::diagnoseProblems() {
// Check for any uses of basic blocks that were not defined.
if (!UndefinedBlocks.empty()) {
// FIXME: These are going to come out in nondeterministic order.
for (auto Entry : UndefinedBlocks)
P.diagnose(Entry.second.first, diag::sil_undefined_basicblock_use,
Entry.second.second);
HadError = true;
}
if (!ForwardRefLocalValues.empty()) {
// FIXME: These are going to come out in nondeterministic order.
for (auto &Entry : ForwardRefLocalValues)
P.diagnose(Entry.second, diag::sil_use_of_undefined_value,
Entry.first());
HadError = true;
}
return HadError;
}
/// getGlobalNameForDefinition - Given a definition of a global name, look
/// it up and return an appropriate SIL function.
SILFunction *SILParser::getGlobalNameForDefinition(Identifier Name,
CanSILFunctionType Ty,
SourceLoc Loc) {
// Check to see if a function of this name has been forward referenced. If so
// complete the forward reference.
auto It = TUState.ForwardRefFns.find(Name);
if (It != TUState.ForwardRefFns.end()) {
SILFunction *Fn = It->second.first;
// Verify that the types match up.
if (Fn->getLoweredFunctionType() != Ty) {
P.diagnose(Loc, diag::sil_value_use_type_mismatch, Name.str(),
Fn->getLoweredFunctionType(), Ty);
P.diagnose(It->second.second, diag::sil_prior_reference);
auto loc = RegularLocation(Loc);
Fn =
SILMod.createFunction(SILLinkage::Private, "", Ty, nullptr, loc,
IsNotBare, IsNotTransparent, IsNotFragile);
Fn->setDebugScope(new (SILMod) SILDebugScope(loc, Fn));
}
assert(Fn->isExternalDeclaration() && "Forward defns cannot have bodies!");
TUState.ForwardRefFns.erase(It);
// Move the function to this position in the module.
SILMod.getFunctionList().remove(Fn);
SILMod.getFunctionList().push_back(Fn);
return Fn;
}
auto loc = RegularLocation(Loc);
// If we don't have a forward reference, make sure the function hasn't been
// defined already.
if (SILMod.lookUpFunction(Name.str()) != nullptr) {
P.diagnose(Loc, diag::sil_value_redefinition, Name.str());
auto *fn =
SILMod.createFunction(SILLinkage::Private, "", Ty, nullptr, loc,
IsNotBare, IsNotTransparent, IsNotFragile);
fn->setDebugScope(new (SILMod) SILDebugScope(loc, fn));
return fn;
}
// Otherwise, this definition is the first use of this name.
auto *fn = SILMod.createFunction(SILLinkage::Private, Name.str(), Ty,
nullptr, loc, IsNotBare,
IsNotTransparent, IsNotFragile);
fn->setDebugScope(new (SILMod) SILDebugScope(loc, fn));
return fn;
}
/// getGlobalNameForReference - Given a reference to a global name, look it
/// up and return an appropriate SIL function.
SILFunction *SILParser::getGlobalNameForReference(Identifier Name,
CanSILFunctionType Ty,
SourceLoc Loc,
bool IgnoreFwdRef) {
auto loc = RegularLocation(Loc);
// Check to see if we have a function by this name already.
if (SILFunction *FnRef = SILMod.lookUpFunction(Name.str())) {
// If so, check for matching types.
if (FnRef->getLoweredFunctionType() != Ty) {
P.diagnose(Loc, diag::sil_value_use_type_mismatch,
Name.str(), FnRef->getLoweredFunctionType(), Ty);
FnRef =
SILMod.createFunction(SILLinkage::Private, "", Ty, nullptr, loc,
IsNotBare, IsNotTransparent, IsNotFragile);
FnRef->setDebugScope(new (SILMod) SILDebugScope(loc, FnRef));
}
return FnRef;
}
// If we didn't find a function, create a new one - it must be a forward
// reference.
auto *Fn = SILMod.createFunction(SILLinkage::Private, Name.str(), Ty,
nullptr, loc, IsNotBare,
IsNotTransparent, IsNotFragile);
Fn->setDebugScope(new (SILMod) SILDebugScope(loc, Fn));
TUState.ForwardRefFns[Name] = { Fn, IgnoreFwdRef ? SourceLoc() : Loc };
TUState.Diags = &P.Diags;
return Fn;
}
/// getBBForDefinition - Return the SILBasicBlock for a definition of the
/// specified block.
SILBasicBlock *SILParser::getBBForDefinition(Identifier Name, SourceLoc Loc) {
// If there was no name specified for this block, just create a new one.
if (Name.empty())
return F->createBasicBlock();
SILBasicBlock *&BB = BlocksByName[Name];
// If the block has never been named yet, just create it.
if (BB == nullptr)
return BB = F->createBasicBlock();
// If it already exists, it was either a forward reference or a redefinition.
// If it is a forward reference, it should be in our undefined set.
if (!UndefinedBlocks.erase(BB)) {
// If we have a redefinition, return a new BB to avoid inserting
// instructions after the terminator.
P.diagnose(Loc, diag::sil_basicblock_redefinition, Name);
HadError = true;
return F->createBasicBlock();
}
// FIXME: Splice the block to the end of the function so they come out in the
// right order.
return BB;
}
/// getBBForReference - return the SILBasicBlock of the specified name. The
/// source location is used to diagnose a failure if the block ends up never
/// being defined.
SILBasicBlock *SILParser::getBBForReference(Identifier Name, SourceLoc Loc) {
// If the block has already been created, use it.
SILBasicBlock *&BB = BlocksByName[Name];
if (BB != nullptr)
return BB;
// Otherwise, create it and remember that this is a forward reference so
// that we can diagnose use without definition problems.
BB = F->createBasicBlock();
UndefinedBlocks[BB] = {Loc, Name};
return BB;
}
/// sil-global-name:
/// '@' identifier
bool SILParser::parseGlobalName(Identifier &Name) {
return P.parseToken(tok::at_sign, diag::expected_sil_value_name) ||
parseSILIdentifier(Name, diag::expected_sil_value_name);
}
/// getLocalValue - Get a reference to a local value with the specified name
/// and type.
SILValue SILParser::getLocalValue(UnresolvedValueName Name, SILType Type,
SILLocation Loc, SILBuilder &B) {
if (Name.isUndef())
return SILUndef::get(Type, &SILMod);
// Check to see if this is already defined.
ValueBase *&Entry = LocalValues[Name.Name];
if (Entry) {
// If this value is already defined, check it to make sure types match.
SILType EntryTy = Entry->getType();
if (EntryTy != Type) {
HadError = true;
P.diagnose(Name.NameLoc, diag::sil_value_use_type_mismatch, Name.Name,
EntryTy.getSwiftRValueType(), Type.getSwiftRValueType());
// Make sure to return something of the requested type.
return new (SILMod) GlobalAddrInst(getDebugLoc(B, Loc), Type);
}
return SILValue(Entry);
}
// Otherwise, this is a forward reference. Create a dummy node to represent
// it until we see a real definition.
ForwardRefLocalValues[Name.Name] = Name.NameLoc;
Entry = new (SILMod) GlobalAddrInst(getDebugLoc(B, Loc), Type);
return Entry;
}
/// setLocalValue - When an instruction or block argument is defined, this
/// method is used to register it and update our symbol table.
void SILParser::setLocalValue(ValueBase *Value, StringRef Name,
SourceLoc NameLoc) {
ValueBase *&Entry = LocalValues[Name];
// If this value was already defined, it is either a redefinition, or a
// specification for a forward referenced value.
if (Entry) {
if (!ForwardRefLocalValues.erase(Name)) {
P.diagnose(NameLoc, diag::sil_value_redefinition, Name);
HadError = true;
return;
}
// If the forward reference was of the wrong type, diagnose this now.
if (Entry->getType() != Value->getType()) {
P.diagnose(NameLoc, diag::sil_value_def_type_mismatch, Name,
Entry->getType().getSwiftRValueType(),
Value->getType().getSwiftRValueType());
HadError = true;
} else {
// Forward references only live here if they have a single result.
Entry->replaceAllUsesWith(Value);
}
Entry = Value;
return;
}
// Otherwise, just store it in our map.
Entry = Value;
}
//===----------------------------------------------------------------------===//
// SIL Parsing Logic
//===----------------------------------------------------------------------===//
/// parseSILLinkage - Parse a linkage specifier if present.
/// sil-linkage:
/// /*empty*/ // default depends on whether this is a definition
/// 'public'
/// 'hidden'
/// 'shared'
/// 'private'
/// 'public_external'
/// 'hidden_external'
/// 'private_external'
static bool parseSILLinkage(Optional<SILLinkage> &Result, Parser &P) {
// Begin by initializing result to our base value of None.
Result = None;
// Unfortunate collision with access control keywords.
if (P.Tok.is(tok::kw_public)) {
Result = SILLinkage::Public;
P.consumeToken();
return false;
}
// Unfortunate collision with access control keywords.
if (P.Tok.is(tok::kw_private)) {
Result = SILLinkage::Private;
P.consumeToken();
return false;
}
// If we do not have an identifier, bail. All SILLinkages that we are parsing
// are identifiers.
if (P.Tok.isNot(tok::identifier))
return false;
// Then use a string switch to try and parse the identifier.
Result = llvm::StringSwitch<Optional<SILLinkage>>(P.Tok.getText())
.Case("hidden", SILLinkage::Hidden)
.Case("shared", SILLinkage::Shared)
.Case("public_external", SILLinkage::PublicExternal)
.Case("hidden_external", SILLinkage::HiddenExternal)
.Case("shared_external", SILLinkage::SharedExternal)
.Case("private_external", SILLinkage::PrivateExternal)
.Default(None);
// If we succeed, consume the token.
if (Result) {
P.consumeToken(tok::identifier);
}
return false;
}
/// Given whether it's known to be a definition, resolve an optional
/// SIL linkage to a real one.
static SILLinkage resolveSILLinkage(Optional<SILLinkage> linkage,
bool isDefinition) {
if (linkage.hasValue()) {
return linkage.getValue();
} else if (isDefinition) {
return SILLinkage::DefaultForDefinition;
} else {
return SILLinkage::DefaultForDeclaration;
}
}
static bool parseSILOptional(StringRef &Result, SILParser &SP) {
if (SP.P.consumeIf(tok::l_square)) {
Identifier Id;
SP.parseSILIdentifier(Id, diag::expected_in_attribute_list);
SP.P.parseToken(tok::r_square, diag::expected_in_attribute_list);
Result = Id.str();
return true;
}
return false;
}
/// Parse an option attribute ('[' Expected ']')?
static bool parseSILOptional(bool &Result, SILParser &SP, StringRef Expected) {
StringRef Optional;
if (parseSILOptional(Optional, SP)) {
if (Optional != Expected)
return true;
Result = true;
}
return false;
}
namespace {
/// A helper class to perform lookup of IdentTypes in the
/// current parser scope.
class IdentTypeReprLookup : public ASTWalker {
Parser &P;
public:
IdentTypeReprLookup(Parser &P) : P(P) {}
bool walkToTypeReprPre(TypeRepr *Ty) {
auto *T = dyn_cast_or_null<IdentTypeRepr>(Ty);
auto Comp = T->getComponentRange().front();
if (auto Entry = P.lookupInScope(Comp->getIdentifier()))
if (isa<TypeDecl>(Entry)) {
Comp->setValue(Entry);
return false;
}
return true;
}
};
} // end anonymous namespace
/// Remap RequirementReps to Requirements.
void SILParser::convertRequirements(SILFunction *F,
ArrayRef<RequirementRepr> From,
SmallVectorImpl<Requirement> &To) {
if (From.empty()) {
To.clear();
return;
}
auto *GenericEnv = F->getGenericEnvironment();
assert(GenericEnv);
IdentTypeReprLookup PerformLookup(P);
// Use parser lexical scopes to resolve references
// to the generic parameters.
auto ResolveToInterfaceType = [&](TypeLoc Ty) -> Type {
Ty.getTypeRepr()->walk(PerformLookup);
performTypeLocChecking(Ty, /* IsSIL */ false);
assert(Ty.getType());
return GenericEnv->mapTypeOutOfContext(Ty.getType()->getCanonicalType());
};
for (auto &Req : From) {
if (Req.getKind() == RequirementReprKind::SameType) {
auto FirstType = ResolveToInterfaceType(Req.getFirstTypeLoc());
auto SecondType = ResolveToInterfaceType(Req.getSecondTypeLoc());
Requirement ConvertedRequirement(RequirementKind::SameType, FirstType,
SecondType);
To.push_back(ConvertedRequirement);
continue;
}
if (Req.getKind() == RequirementReprKind::TypeConstraint) {
auto FirstType = ResolveToInterfaceType(Req.getFirstTypeLoc());
auto SecondType = ResolveToInterfaceType(Req.getSecondTypeLoc());
Requirement ConvertedRequirement(RequirementKind::Conformance, FirstType,
SecondType);
To.push_back(ConvertedRequirement);
continue;
}
if (Req.getKind() == RequirementReprKind::LayoutConstraint) {
auto Subject = ResolveToInterfaceType(Req.getSubjectLoc());
Requirement ConvertedRequirement(RequirementKind::Layout, Subject,
Req.getLayoutConstraint());
To.push_back(ConvertedRequirement);
continue;
}
llvm_unreachable("Unsupported requirement kind");
}
}
static bool parseDeclSILOptional(bool *isTransparent, bool *isFragile,
IsThunk_t *isThunk, bool *isGlobalInit,
Inline_t *inlineStrategy, bool *isLet,
SmallVectorImpl<std::string> *Semantics,
SmallVectorImpl<ParsedSpecAttr> *SpecAttrs,
ValueDecl **ClangDecl,
EffectsKind *MRK, SILParser &SP) {
while (SP.P.consumeIf(tok::l_square)) {
if (isLet && SP.P.Tok.is(tok::kw_let)) {
*isLet = true;
SP.P.consumeToken(tok::kw_let);
SP.P.parseToken(tok::r_square, diag::expected_in_attribute_list);
continue;
}
else if (SP.P.Tok.isNot(tok::identifier)) {
SP.P.diagnose(SP.P.Tok, diag::expected_in_attribute_list);
return true;
} else if (isTransparent && SP.P.Tok.getText() == "transparent")
*isTransparent = true;
else if (isFragile && SP.P.Tok.getText() == "fragile")
*isFragile = true;
else if (isThunk && SP.P.Tok.getText() == "thunk")
*isThunk = IsThunk;
else if (isThunk && SP.P.Tok.getText() == "reabstraction_thunk")
*isThunk = IsReabstractionThunk;
else if (isGlobalInit && SP.P.Tok.getText() == "global_init")
*isGlobalInit = true;
else if (inlineStrategy && SP.P.Tok.getText() == "noinline")
*inlineStrategy = NoInline;
else if (inlineStrategy && SP.P.Tok.getText() == "always_inline")
*inlineStrategy = AlwaysInline;
else if (MRK && SP.P.Tok.getText() == "readnone")
*MRK = EffectsKind::ReadNone;
else if (MRK && SP.P.Tok.getText() == "readonly")
*MRK = EffectsKind::ReadOnly;
else if (MRK && SP.P.Tok.getText() == "readwrite")
*MRK = EffectsKind::ReadWrite;
else if (Semantics && SP.P.Tok.getText() == "_semantics") {
SP.P.consumeToken(tok::identifier);
if (SP.P.Tok.getKind() != tok::string_literal) {
SP.P.diagnose(SP.P.Tok, diag::expected_in_attribute_list);
return true;
}
// Drop the double quotes.
StringRef rawString = SP.P.Tok.getText().drop_front().drop_back();
Semantics->push_back(rawString);
SP.P.consumeToken(tok::string_literal);
SP.P.parseToken(tok::r_square, diag::expected_in_attribute_list);
continue;
}
else if (SpecAttrs && SP.P.Tok.getText() == "_specialize") {
SourceLoc AtLoc = SP.P.Tok.getLoc();
SourceLoc Loc(AtLoc);
// Parse a _specialized attribute, building a parsed substitution list
// and pushing a new ParsedSpecAttr on the SpecAttrs list. Conformances
// cannot be generated until the function declaration is fully parsed so
// that the function's generic signature can be consulted.
ParsedSpecAttr SpecAttr;
SpecAttr.requirements = {};
SpecAttr.exported = false;
SpecAttr.kind = SILSpecializeAttr::SpecializationKind::Full;
SpecializeAttr *Attr;
if (!SP.P.parseSpecializeAttribute(tok::r_square, AtLoc, Loc, Attr))
return true;
// Convert SpecializeAttr into ParsedSpecAttr.
SpecAttr.requirements = Attr->getTrailingWhereClause()->getRequirements();
SpecAttr.kind = Attr->getSpecializationKind() ==
swift::SpecializeAttr::SpecializationKind::Full
? SILSpecializeAttr::SpecializationKind::Full
: SILSpecializeAttr::SpecializationKind::Partial;
SpecAttr.exported = Attr->isExported();
SpecAttrs->emplace_back(SpecAttr);
continue;
}
else if (ClangDecl && SP.P.Tok.getText() == "clang") {
SP.P.consumeToken(tok::identifier);
if (SP.parseSILDottedPathWithoutPound(*ClangDecl))
return true;
SP.P.parseToken(tok::r_square, diag::expected_in_attribute_list);
continue;
}
else {
SP.P.diagnose(SP.P.Tok, diag::expected_in_attribute_list);
return true;
}
SP.P.consumeToken(tok::identifier);
SP.P.parseToken(tok::r_square, diag::expected_in_attribute_list);
}
return false;
}
bool SILParser::performTypeLocChecking(TypeLoc &T, bool IsSILType,
GenericEnvironment *GenericEnv,
DeclContext *DC) {
// Do some type checking / name binding for the parsed type.
assert(P.SF.ASTStage == SourceFile::Parsing &&
"Unexpected stage during parsing!");
if (GenericEnv == nullptr)
GenericEnv = this->GenericEnv;
if (!DC)
DC = &P.SF;
return swift::performTypeLocChecking(P.Context, T,
/*isSILMode=*/true, IsSILType,
GenericEnv, DC);
}
/// Find the top-level ValueDecl or Module given a name.
static llvm::PointerUnion<ValueDecl*, ModuleDecl*> lookupTopDecl(Parser &P,
Identifier Name) {
// Use UnqualifiedLookup to look through all of the imports.
// We have to lie and say we're done with parsing to make this happen.
assert(P.SF.ASTStage == SourceFile::Parsing &&
"Unexpected stage during parsing!");
llvm::SaveAndRestore<SourceFile::ASTStage_t> ASTStage(P.SF.ASTStage,
SourceFile::Parsed);
UnqualifiedLookup DeclLookup(Name, &P.SF, nullptr);
assert(DeclLookup.isSuccess() && DeclLookup.Results.size() == 1);
ValueDecl *VD = DeclLookup.Results.back().getValueDecl();
return VD;
}
/// Find the ValueDecl given an interface type and a member name.
static ValueDecl *lookupMember(Parser &P, Type Ty, Identifier Name,
SourceLoc Loc,
SmallVectorImpl<ValueDecl *> &Lookup,
bool ExpectMultipleResults) {
Type CheckTy = Ty;
if (auto MetaTy = CheckTy->getAs<AnyMetatypeType>())
CheckTy = MetaTy->getInstanceType();
if (auto nominal = CheckTy->getAnyNominal()) {
auto found = nominal->lookupDirect(Name);
Lookup.append(found.begin(), found.end());
} else if (auto moduleTy = CheckTy->getAs<ModuleType>()) {
moduleTy->getModule()->lookupValue({ }, Name, NLKind::QualifiedLookup,
Lookup);
} else {
P.diagnose(Loc, diag::sil_member_lookup_bad_type, Name, Ty);
return nullptr;
}
if (Lookup.empty() || (!ExpectMultipleResults && Lookup.size() != 1)) {
P.diagnose(Loc, diag::sil_named_member_decl_not_found, Name, Ty);
return nullptr;
}
return Lookup[0];
}
bool SILParser::parseASTType(CanType &result) {
ParserResult<TypeRepr> parsedType = P.parseType();
if (parsedType.isNull()) return true;
TypeLoc loc = parsedType.get();
if (performTypeLocChecking(loc, /*IsSILType=*/ false))
return true;
result = loc.getType()->getCanonicalType();
// Invoke the callback on the parsed type.
ParsedTypeCallback(loc.getType());
return false;
}
/// sil-type:
/// '$' '*'? attribute-list (generic-params)? type
///
bool SILParser::parseSILType(SILType &Result,
GenericEnvironment *&GenericEnv,
bool IsFuncDecl){
GenericEnv = nullptr;
if (P.parseToken(tok::sil_dollar, diag::expected_sil_type))
return true;
// If we have a '*', then this is an address type.
SILValueCategory category = SILValueCategory::Object;
if (P.Tok.isAnyOperator() && P.Tok.getText().startswith("*")) {
category = SILValueCategory::Address;
P.consumeStartingCharacterOfCurrentToken();
}
// Parse attributes.
SourceLoc inoutLoc;
TypeAttributes attrs;
P.parseTypeAttributeList(inoutLoc, attrs);
// Global functions are implicitly @convention(thin) if not specified otherwise.
if (IsFuncDecl && !attrs.has(TAK_convention)) {
// Use a random location.
attrs.setAttr(TAK_convention, P.PreviousLoc);
attrs.convention = "thin";
}
ParserResult<TypeRepr> TyR = P.parseType(diag::expected_sil_type,
/*handleCodeCompletion*/ true,
/*isSILFuncDecl*/ IsFuncDecl);
if (TyR.isNull())
return true;
// Resolve the generic environments for parsed generic function and box types.
class HandleSILGenericParamsWalker : public ASTWalker {
ASTContext &C;