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TGParser.cpp
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//===- TGParser.cpp - Parser for TableGen Files ---------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// Implement the Parser for TableGen.
//
//===----------------------------------------------------------------------===//
#include "TGParser.h"
#include "llvm/ADT/None.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/Twine.h"
#include "llvm/Config/llvm-config.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Support/SourceMgr.h"
#include <algorithm>
#include <cassert>
#include <cstdint>
using namespace llvm;
//===----------------------------------------------------------------------===//
// Support Code for the Semantic Actions.
//===----------------------------------------------------------------------===//
namespace llvm {
struct SubClassReference {
SMRange RefRange;
Record *Rec;
SmallVector<Init*, 4> TemplateArgs;
SubClassReference() : Rec(nullptr) {}
bool isInvalid() const { return Rec == nullptr; }
};
struct SubMultiClassReference {
SMRange RefRange;
MultiClass *MC;
SmallVector<Init*, 4> TemplateArgs;
SubMultiClassReference() : MC(nullptr) {}
bool isInvalid() const { return MC == nullptr; }
void dump() const;
};
#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
LLVM_DUMP_METHOD void SubMultiClassReference::dump() const {
errs() << "Multiclass:\n";
MC->dump();
errs() << "Template args:\n";
for (Init *TA : TemplateArgs)
TA->dump();
}
#endif
} // end namespace llvm
static bool checkBitsConcrete(Record &R, const RecordVal &RV) {
BitsInit *BV = cast<BitsInit>(RV.getValue());
for (unsigned i = 0, e = BV->getNumBits(); i != e; ++i) {
Init *Bit = BV->getBit(i);
bool IsReference = false;
if (auto VBI = dyn_cast<VarBitInit>(Bit)) {
if (auto VI = dyn_cast<VarInit>(VBI->getBitVar())) {
if (R.getValue(VI->getName()))
IsReference = true;
}
} else if (isa<VarInit>(Bit)) {
IsReference = true;
}
if (!(IsReference || Bit->isConcrete()))
return false;
}
return true;
}
static void checkConcrete(Record &R) {
for (const RecordVal &RV : R.getValues()) {
// HACK: Disable this check for variables declared with 'field'. This is
// done merely because existing targets have legitimate cases of
// non-concrete variables in helper defs. Ideally, we'd introduce a
// 'maybe' or 'optional' modifier instead of this.
if (RV.getPrefix())
continue;
if (Init *V = RV.getValue()) {
bool Ok = isa<BitsInit>(V) ? checkBitsConcrete(R, RV) : V->isConcrete();
if (!Ok) {
PrintError(R.getLoc(),
Twine("Initializer of '") + RV.getNameInitAsString() +
"' in '" + R.getNameInitAsString() +
"' could not be fully resolved: " +
RV.getValue()->getAsString());
}
}
}
}
/// Return an Init with a qualifier prefix referring
/// to CurRec's name.
static Init *QualifyName(Record &CurRec, MultiClass *CurMultiClass,
Init *Name, StringRef Scoper) {
Init *NewName =
BinOpInit::getStrConcat(CurRec.getNameInit(), StringInit::get(Scoper));
NewName = BinOpInit::getStrConcat(NewName, Name);
if (CurMultiClass && Scoper != "::") {
Init *Prefix = BinOpInit::getStrConcat(CurMultiClass->Rec.getNameInit(),
StringInit::get("::"));
NewName = BinOpInit::getStrConcat(Prefix, NewName);
}
if (BinOpInit *BinOp = dyn_cast<BinOpInit>(NewName))
NewName = BinOp->Fold(&CurRec);
return NewName;
}
/// Return the qualified version of the implicit 'NAME' template argument.
static Init *QualifiedNameOfImplicitName(Record &Rec,
MultiClass *MC = nullptr) {
return QualifyName(Rec, MC, StringInit::get("NAME"), MC ? "::" : ":");
}
static Init *QualifiedNameOfImplicitName(MultiClass *MC) {
return QualifiedNameOfImplicitName(MC->Rec, MC);
}
bool TGParser::AddValue(Record *CurRec, SMLoc Loc, const RecordVal &RV) {
if (!CurRec)
CurRec = &CurMultiClass->Rec;
if (RecordVal *ERV = CurRec->getValue(RV.getNameInit())) {
// The value already exists in the class, treat this as a set.
if (ERV->setValue(RV.getValue()))
return Error(Loc, "New definition of '" + RV.getName() + "' of type '" +
RV.getType()->getAsString() + "' is incompatible with " +
"previous definition of type '" +
ERV->getType()->getAsString() + "'");
} else {
CurRec->addValue(RV);
}
return false;
}
/// SetValue -
/// Return true on error, false on success.
bool TGParser::SetValue(Record *CurRec, SMLoc Loc, Init *ValName,
ArrayRef<unsigned> BitList, Init *V,
bool AllowSelfAssignment) {
if (!V) return false;
if (!CurRec) CurRec = &CurMultiClass->Rec;
RecordVal *RV = CurRec->getValue(ValName);
if (!RV)
return Error(Loc, "Value '" + ValName->getAsUnquotedString() +
"' unknown!");
// Do not allow assignments like 'X = X'. This will just cause infinite loops
// in the resolution machinery.
if (BitList.empty())
if (VarInit *VI = dyn_cast<VarInit>(V))
if (VI->getNameInit() == ValName && !AllowSelfAssignment)
return Error(Loc, "Recursion / self-assignment forbidden");
// If we are assigning to a subset of the bits in the value... then we must be
// assigning to a field of BitsRecTy, which must have a BitsInit
// initializer.
//
if (!BitList.empty()) {
BitsInit *CurVal = dyn_cast<BitsInit>(RV->getValue());
if (!CurVal)
return Error(Loc, "Value '" + ValName->getAsUnquotedString() +
"' is not a bits type");
// Convert the incoming value to a bits type of the appropriate size...
Init *BI = V->getCastTo(BitsRecTy::get(BitList.size()));
if (!BI)
return Error(Loc, "Initializer is not compatible with bit range");
SmallVector<Init *, 16> NewBits(CurVal->getNumBits());
// Loop over bits, assigning values as appropriate.
for (unsigned i = 0, e = BitList.size(); i != e; ++i) {
unsigned Bit = BitList[i];
if (NewBits[Bit])
return Error(Loc, "Cannot set bit #" + Twine(Bit) + " of value '" +
ValName->getAsUnquotedString() + "' more than once");
NewBits[Bit] = BI->getBit(i);
}
for (unsigned i = 0, e = CurVal->getNumBits(); i != e; ++i)
if (!NewBits[i])
NewBits[i] = CurVal->getBit(i);
V = BitsInit::get(NewBits);
}
if (RV->setValue(V, Loc)) {
std::string InitType;
if (BitsInit *BI = dyn_cast<BitsInit>(V))
InitType = (Twine("' of type bit initializer with length ") +
Twine(BI->getNumBits())).str();
else if (TypedInit *TI = dyn_cast<TypedInit>(V))
InitType = (Twine("' of type '") + TI->getType()->getAsString()).str();
return Error(Loc, "Field '" + ValName->getAsUnquotedString() +
"' of type '" + RV->getType()->getAsString() +
"' is incompatible with value '" +
V->getAsString() + InitType + "'");
}
return false;
}
/// AddSubClass - Add SubClass as a subclass to CurRec, resolving its template
/// args as SubClass's template arguments.
bool TGParser::AddSubClass(Record *CurRec, SubClassReference &SubClass) {
Record *SC = SubClass.Rec;
// Add all of the values in the subclass into the current class.
for (const RecordVal &Val : SC->getValues())
if (AddValue(CurRec, SubClass.RefRange.Start, Val))
return true;
ArrayRef<Init *> TArgs = SC->getTemplateArgs();
// Ensure that an appropriate number of template arguments are specified.
if (TArgs.size() < SubClass.TemplateArgs.size())
return Error(SubClass.RefRange.Start,
"More template args specified than expected");
// Loop over all of the template arguments, setting them to the specified
// value or leaving them as the default if necessary.
MapResolver R(CurRec);
for (unsigned i = 0, e = TArgs.size(); i != e; ++i) {
if (i < SubClass.TemplateArgs.size()) {
// If a value is specified for this template arg, set it now.
if (SetValue(CurRec, SubClass.RefRange.Start, TArgs[i],
None, SubClass.TemplateArgs[i]))
return true;
} else if (!CurRec->getValue(TArgs[i])->getValue()->isComplete()) {
return Error(SubClass.RefRange.Start,
"Value not specified for template argument #" +
Twine(i) + " (" + TArgs[i]->getAsUnquotedString() +
") of subclass '" + SC->getNameInitAsString() + "'!");
}
R.set(TArgs[i], CurRec->getValue(TArgs[i])->getValue());
CurRec->removeValue(TArgs[i]);
}
Init *Name;
if (CurRec->isClass())
Name =
VarInit::get(QualifiedNameOfImplicitName(*CurRec), StringRecTy::get());
else
Name = CurRec->getNameInit();
R.set(QualifiedNameOfImplicitName(*SC), Name);
CurRec->resolveReferences(R);
// Since everything went well, we can now set the "superclass" list for the
// current record.
ArrayRef<std::pair<Record *, SMRange>> SCs = SC->getSuperClasses();
for (const auto &SCPair : SCs) {
if (CurRec->isSubClassOf(SCPair.first))
return Error(SubClass.RefRange.Start,
"Already subclass of '" + SCPair.first->getName() + "'!\n");
CurRec->addSuperClass(SCPair.first, SCPair.second);
}
if (CurRec->isSubClassOf(SC))
return Error(SubClass.RefRange.Start,
"Already subclass of '" + SC->getName() + "'!\n");
CurRec->addSuperClass(SC, SubClass.RefRange);
return false;
}
bool TGParser::AddSubClass(RecordsEntry &Entry, SubClassReference &SubClass) {
if (Entry.Rec)
return AddSubClass(Entry.Rec.get(), SubClass);
for (auto &E : Entry.Loop->Entries) {
if (AddSubClass(E, SubClass))
return true;
}
return false;
}
/// AddSubMultiClass - Add SubMultiClass as a subclass to
/// CurMC, resolving its template args as SubMultiClass's
/// template arguments.
bool TGParser::AddSubMultiClass(MultiClass *CurMC,
SubMultiClassReference &SubMultiClass) {
MultiClass *SMC = SubMultiClass.MC;
ArrayRef<Init *> SMCTArgs = SMC->Rec.getTemplateArgs();
if (SMCTArgs.size() < SubMultiClass.TemplateArgs.size())
return Error(SubMultiClass.RefRange.Start,
"More template args specified than expected");
// Prepare the mapping of template argument name to value, filling in default
// values if necessary.
SubstStack TemplateArgs;
for (unsigned i = 0, e = SMCTArgs.size(); i != e; ++i) {
if (i < SubMultiClass.TemplateArgs.size()) {
TemplateArgs.emplace_back(SMCTArgs[i], SubMultiClass.TemplateArgs[i]);
} else {
Init *Default = SMC->Rec.getValue(SMCTArgs[i])->getValue();
if (!Default->isComplete()) {
return Error(SubMultiClass.RefRange.Start,
"value not specified for template argument #" + Twine(i) +
" (" + SMCTArgs[i]->getAsUnquotedString() +
") of multiclass '" + SMC->Rec.getNameInitAsString() +
"'");
}
TemplateArgs.emplace_back(SMCTArgs[i], Default);
}
}
TemplateArgs.emplace_back(
QualifiedNameOfImplicitName(SMC),
VarInit::get(QualifiedNameOfImplicitName(CurMC), StringRecTy::get()));
// Add all of the defs in the subclass into the current multiclass.
return resolve(SMC->Entries, TemplateArgs, false, &CurMC->Entries);
}
/// Add a record or foreach loop to the current context (global record keeper,
/// current inner-most foreach loop, or multiclass).
bool TGParser::addEntry(RecordsEntry E) {
assert(!E.Rec || !E.Loop);
if (!Loops.empty()) {
Loops.back()->Entries.push_back(std::move(E));
return false;
}
if (E.Loop) {
SubstStack Stack;
return resolve(*E.Loop, Stack, CurMultiClass == nullptr,
CurMultiClass ? &CurMultiClass->Entries : nullptr);
}
if (CurMultiClass) {
CurMultiClass->Entries.push_back(std::move(E));
return false;
}
return addDefOne(std::move(E.Rec));
}
/// Resolve the entries in \p Loop, going over inner loops recursively
/// and making the given subsitutions of (name, value) pairs.
///
/// The resulting records are stored in \p Dest if non-null. Otherwise, they
/// are added to the global record keeper.
bool TGParser::resolve(const ForeachLoop &Loop, SubstStack &Substs,
bool Final, std::vector<RecordsEntry> *Dest,
SMLoc *Loc) {
MapResolver R;
for (const auto &S : Substs)
R.set(S.first, S.second);
Init *List = Loop.ListValue->resolveReferences(R);
auto LI = dyn_cast<ListInit>(List);
if (!LI) {
if (!Final) {
Dest->emplace_back(std::make_unique<ForeachLoop>(Loop.Loc, Loop.IterVar,
List));
return resolve(Loop.Entries, Substs, Final, &Dest->back().Loop->Entries,
Loc);
}
PrintError(Loop.Loc, Twine("attempting to loop over '") +
List->getAsString() + "', expected a list");
return true;
}
bool Error = false;
for (auto Elt : *LI) {
if (Loop.IterVar)
Substs.emplace_back(Loop.IterVar->getNameInit(), Elt);
Error = resolve(Loop.Entries, Substs, Final, Dest);
if (Loop.IterVar)
Substs.pop_back();
if (Error)
break;
}
return Error;
}
/// Resolve the entries in \p Source, going over loops recursively and
/// making the given substitutions of (name, value) pairs.
///
/// The resulting records are stored in \p Dest if non-null. Otherwise, they
/// are added to the global record keeper.
bool TGParser::resolve(const std::vector<RecordsEntry> &Source,
SubstStack &Substs, bool Final,
std::vector<RecordsEntry> *Dest, SMLoc *Loc) {
bool Error = false;
for (auto &E : Source) {
if (E.Loop) {
Error = resolve(*E.Loop, Substs, Final, Dest);
} else {
auto Rec = std::make_unique<Record>(*E.Rec);
if (Loc)
Rec->appendLoc(*Loc);
MapResolver R(Rec.get());
for (const auto &S : Substs)
R.set(S.first, S.second);
Rec->resolveReferences(R);
if (Dest)
Dest->push_back(std::move(Rec));
else
Error = addDefOne(std::move(Rec));
}
if (Error)
break;
}
return Error;
}
/// Resolve the record fully and add it to the record keeper.
bool TGParser::addDefOne(std::unique_ptr<Record> Rec) {
if (Record *Prev = Records.getDef(Rec->getNameInitAsString())) {
if (!Rec->isAnonymous()) {
PrintError(Rec->getLoc(),
"def already exists: " + Rec->getNameInitAsString());
PrintNote(Prev->getLoc(), "location of previous definition");
return true;
}
Rec->setName(Records.getNewAnonymousName());
}
Rec->resolveReferences();
checkConcrete(*Rec);
if (!isa<StringInit>(Rec->getNameInit())) {
PrintError(Rec->getLoc(), Twine("record name '") +
Rec->getNameInit()->getAsString() +
"' could not be fully resolved");
return true;
}
// If ObjectBody has template arguments, it's an error.
assert(Rec->getTemplateArgs().empty() && "How'd this get template args?");
for (DefsetRecord *Defset : Defsets) {
DefInit *I = Rec->getDefInit();
if (!I->getType()->typeIsA(Defset->EltTy)) {
PrintError(Rec->getLoc(), Twine("adding record of incompatible type '") +
I->getType()->getAsString() +
"' to defset");
PrintNote(Defset->Loc, "location of defset declaration");
return true;
}
Defset->Elements.push_back(I);
}
Records.addDef(std::move(Rec));
return false;
}
//===----------------------------------------------------------------------===//
// Parser Code
//===----------------------------------------------------------------------===//
/// isObjectStart - Return true if this is a valid first token for an Object.
static bool isObjectStart(tgtok::TokKind K) {
return K == tgtok::Class || K == tgtok::Def || K == tgtok::Defm ||
K == tgtok::Let || K == tgtok::MultiClass || K == tgtok::Foreach ||
K == tgtok::Defset || K == tgtok::Defvar || K == tgtok::If;
}
bool TGParser::consume(tgtok::TokKind K) {
if (Lex.getCode() == K) {
Lex.Lex();
return true;
}
return false;
}
/// ParseObjectName - If a valid object name is specified, return it. If no
/// name is specified, return the unset initializer. Return nullptr on parse
/// error.
/// ObjectName ::= Value [ '#' Value ]*
/// ObjectName ::= /*empty*/
///
Init *TGParser::ParseObjectName(MultiClass *CurMultiClass) {
switch (Lex.getCode()) {
case tgtok::colon:
case tgtok::semi:
case tgtok::l_brace:
// These are all of the tokens that can begin an object body.
// Some of these can also begin values but we disallow those cases
// because they are unlikely to be useful.
return UnsetInit::get();
default:
break;
}
Record *CurRec = nullptr;
if (CurMultiClass)
CurRec = &CurMultiClass->Rec;
Init *Name = ParseValue(CurRec, StringRecTy::get(), ParseNameMode);
if (!Name)
return nullptr;
if (CurMultiClass) {
Init *NameStr = QualifiedNameOfImplicitName(CurMultiClass);
HasReferenceResolver R(NameStr);
Name->resolveReferences(R);
if (!R.found())
Name = BinOpInit::getStrConcat(VarInit::get(NameStr, StringRecTy::get()),
Name);
}
return Name;
}
/// ParseClassID - Parse and resolve a reference to a class name. This returns
/// null on error.
///
/// ClassID ::= ID
///
Record *TGParser::ParseClassID() {
if (Lex.getCode() != tgtok::Id) {
TokError("expected name for ClassID");
return nullptr;
}
Record *Result = Records.getClass(Lex.getCurStrVal());
if (!Result) {
std::string Msg("Couldn't find class '" + Lex.getCurStrVal() + "'");
if (MultiClasses[Lex.getCurStrVal()].get())
TokError(Msg + ". Use 'defm' if you meant to use multiclass '" +
Lex.getCurStrVal() + "'");
else
TokError(Msg);
}
Lex.Lex();
return Result;
}
/// ParseMultiClassID - Parse and resolve a reference to a multiclass name.
/// This returns null on error.
///
/// MultiClassID ::= ID
///
MultiClass *TGParser::ParseMultiClassID() {
if (Lex.getCode() != tgtok::Id) {
TokError("expected name for MultiClassID");
return nullptr;
}
MultiClass *Result = MultiClasses[Lex.getCurStrVal()].get();
if (!Result)
TokError("Couldn't find multiclass '" + Lex.getCurStrVal() + "'");
Lex.Lex();
return Result;
}
/// ParseSubClassReference - Parse a reference to a subclass or to a templated
/// subclass. This returns a SubClassRefTy with a null Record* on error.
///
/// SubClassRef ::= ClassID
/// SubClassRef ::= ClassID '<' ValueList '>'
///
SubClassReference TGParser::
ParseSubClassReference(Record *CurRec, bool isDefm) {
SubClassReference Result;
Result.RefRange.Start = Lex.getLoc();
if (isDefm) {
if (MultiClass *MC = ParseMultiClassID())
Result.Rec = &MC->Rec;
} else {
Result.Rec = ParseClassID();
}
if (!Result.Rec) return Result;
// If there is no template arg list, we're done.
if (!consume(tgtok::less)) {
Result.RefRange.End = Lex.getLoc();
return Result;
}
if (Lex.getCode() == tgtok::greater) {
TokError("subclass reference requires a non-empty list of template values");
Result.Rec = nullptr;
return Result;
}
ParseValueList(Result.TemplateArgs, CurRec, Result.Rec);
if (Result.TemplateArgs.empty()) {
Result.Rec = nullptr; // Error parsing value list.
return Result;
}
if (!consume(tgtok::greater)) {
TokError("expected '>' in template value list");
Result.Rec = nullptr;
return Result;
}
Result.RefRange.End = Lex.getLoc();
return Result;
}
/// ParseSubMultiClassReference - Parse a reference to a subclass or to a
/// templated submulticlass. This returns a SubMultiClassRefTy with a null
/// Record* on error.
///
/// SubMultiClassRef ::= MultiClassID
/// SubMultiClassRef ::= MultiClassID '<' ValueList '>'
///
SubMultiClassReference TGParser::
ParseSubMultiClassReference(MultiClass *CurMC) {
SubMultiClassReference Result;
Result.RefRange.Start = Lex.getLoc();
Result.MC = ParseMultiClassID();
if (!Result.MC) return Result;
// If there is no template arg list, we're done.
if (!consume(tgtok::less)) {
Result.RefRange.End = Lex.getLoc();
return Result;
}
if (Lex.getCode() == tgtok::greater) {
TokError("subclass reference requires a non-empty list of template values");
Result.MC = nullptr;
return Result;
}
ParseValueList(Result.TemplateArgs, &CurMC->Rec, &Result.MC->Rec);
if (Result.TemplateArgs.empty()) {
Result.MC = nullptr; // Error parsing value list.
return Result;
}
if (!consume(tgtok::greater)) {
TokError("expected '>' in template value list");
Result.MC = nullptr;
return Result;
}
Result.RefRange.End = Lex.getLoc();
return Result;
}
/// ParseRangePiece - Parse a bit/value range.
/// RangePiece ::= INTVAL
/// RangePiece ::= INTVAL '...' INTVAL
/// RangePiece ::= INTVAL '-' INTVAL
/// RangePiece ::= INTVAL INTVAL
// The last two forms are deprecated.
bool TGParser::ParseRangePiece(SmallVectorImpl<unsigned> &Ranges,
TypedInit *FirstItem) {
Init *CurVal = FirstItem;
if (!CurVal)
CurVal = ParseValue(nullptr);
IntInit *II = dyn_cast_or_null<IntInit>(CurVal);
if (!II)
return TokError("expected integer or bitrange");
int64_t Start = II->getValue();
int64_t End;
if (Start < 0)
return TokError("invalid range, cannot be negative");
switch (Lex.getCode()) {
default:
Ranges.push_back(Start);
return false;
case tgtok::dotdotdot:
case tgtok::minus: {
Lex.Lex(); // eat
Init *I_End = ParseValue(nullptr);
IntInit *II_End = dyn_cast_or_null<IntInit>(I_End);
if (!II_End) {
TokError("expected integer value as end of range");
return true;
}
End = II_End->getValue();
break;
}
case tgtok::IntVal: {
End = -Lex.getCurIntVal();
Lex.Lex();
break;
}
}
if (End < 0)
return TokError("invalid range, cannot be negative");
// Add to the range.
if (Start < End)
for (; Start <= End; ++Start)
Ranges.push_back(Start);
else
for (; Start >= End; --Start)
Ranges.push_back(Start);
return false;
}
/// ParseRangeList - Parse a list of scalars and ranges into scalar values.
///
/// RangeList ::= RangePiece (',' RangePiece)*
///
void TGParser::ParseRangeList(SmallVectorImpl<unsigned> &Result) {
// Parse the first piece.
if (ParseRangePiece(Result)) {
Result.clear();
return;
}
while (consume(tgtok::comma))
// Parse the next range piece.
if (ParseRangePiece(Result)) {
Result.clear();
return;
}
}
/// ParseOptionalRangeList - Parse either a range list in <>'s or nothing.
/// OptionalRangeList ::= '<' RangeList '>'
/// OptionalRangeList ::= /*empty*/
bool TGParser::ParseOptionalRangeList(SmallVectorImpl<unsigned> &Ranges) {
SMLoc StartLoc = Lex.getLoc();
if (!consume(tgtok::less))
return false;
// Parse the range list.
ParseRangeList(Ranges);
if (Ranges.empty()) return true;
if (!consume(tgtok::greater)) {
TokError("expected '>' at end of range list");
return Error(StartLoc, "to match this '<'");
}
return false;
}
/// ParseOptionalBitList - Parse either a bit list in {}'s or nothing.
/// OptionalBitList ::= '{' RangeList '}'
/// OptionalBitList ::= /*empty*/
bool TGParser::ParseOptionalBitList(SmallVectorImpl<unsigned> &Ranges) {
SMLoc StartLoc = Lex.getLoc();
if (!consume(tgtok::l_brace))
return false;
// Parse the range list.
ParseRangeList(Ranges);
if (Ranges.empty()) return true;
if (!consume(tgtok::r_brace)) {
TokError("expected '}' at end of bit list");
return Error(StartLoc, "to match this '{'");
}
return false;
}
/// ParseType - Parse and return a tblgen type. This returns null on error.
///
/// Type ::= STRING // string type
/// Type ::= CODE // code type
/// Type ::= BIT // bit type
/// Type ::= BITS '<' INTVAL '>' // bits<x> type
/// Type ::= INT // int type
/// Type ::= LIST '<' Type '>' // list<x> type
/// Type ::= DAG // dag type
/// Type ::= ClassID // Record Type
///
RecTy *TGParser::ParseType() {
switch (Lex.getCode()) {
default: TokError("Unknown token when expecting a type"); return nullptr;
case tgtok::String:
case tgtok::Code: Lex.Lex(); return StringRecTy::get();
case tgtok::Bit: Lex.Lex(); return BitRecTy::get();
case tgtok::Int: Lex.Lex(); return IntRecTy::get();
case tgtok::Dag: Lex.Lex(); return DagRecTy::get();
case tgtok::Id:
if (Record *R = ParseClassID()) return RecordRecTy::get(R);
TokError("unknown class name");
return nullptr;
case tgtok::Bits: {
if (Lex.Lex() != tgtok::less) { // Eat 'bits'
TokError("expected '<' after bits type");
return nullptr;
}
if (Lex.Lex() != tgtok::IntVal) { // Eat '<'
TokError("expected integer in bits<n> type");
return nullptr;
}
uint64_t Val = Lex.getCurIntVal();
if (Lex.Lex() != tgtok::greater) { // Eat count.
TokError("expected '>' at end of bits<n> type");
return nullptr;
}
Lex.Lex(); // Eat '>'
return BitsRecTy::get(Val);
}
case tgtok::List: {
if (Lex.Lex() != tgtok::less) { // Eat 'bits'
TokError("expected '<' after list type");
return nullptr;
}
Lex.Lex(); // Eat '<'
RecTy *SubType = ParseType();
if (!SubType) return nullptr;
if (!consume(tgtok::greater)) {
TokError("expected '>' at end of list<ty> type");
return nullptr;
}
return ListRecTy::get(SubType);
}
}
}
/// ParseIDValue - This is just like ParseIDValue above, but it assumes the ID
/// has already been read.
Init *TGParser::ParseIDValue(Record *CurRec, StringInit *Name, SMLoc NameLoc,
IDParseMode Mode) {
if (CurRec) {
if (const RecordVal *RV = CurRec->getValue(Name))
return VarInit::get(Name, RV->getType());
}
if ((CurRec && CurRec->isClass()) || CurMultiClass) {
Init *TemplateArgName;
if (CurMultiClass) {
TemplateArgName =
QualifyName(CurMultiClass->Rec, CurMultiClass, Name, "::");
} else
TemplateArgName = QualifyName(*CurRec, CurMultiClass, Name, ":");
Record *TemplateRec = CurMultiClass ? &CurMultiClass->Rec : CurRec;
if (TemplateRec->isTemplateArg(TemplateArgName)) {
const RecordVal *RV = TemplateRec->getValue(TemplateArgName);
assert(RV && "Template arg doesn't exist??");
return VarInit::get(TemplateArgName, RV->getType());
} else if (Name->getValue() == "NAME") {
return VarInit::get(TemplateArgName, StringRecTy::get());
}
}
if (CurLocalScope)
if (Init *I = CurLocalScope->getVar(Name->getValue()))
return I;
// If this is in a foreach loop, make sure it's not a loop iterator
for (const auto &L : Loops) {
if (L->IterVar) {
VarInit *IterVar = dyn_cast<VarInit>(L->IterVar);
if (IterVar && IterVar->getNameInit() == Name)
return IterVar;
}
}
if (Mode == ParseNameMode)
return Name;
if (Init *I = Records.getGlobal(Name->getValue()))
return I;
// Allow self-references of concrete defs, but delay the lookup so that we
// get the correct type.
if (CurRec && !CurRec->isClass() && !CurMultiClass &&
CurRec->getNameInit() == Name)
return UnOpInit::get(UnOpInit::CAST, Name, CurRec->getType());
Error(NameLoc, "Variable not defined: '" + Name->getValue() + "'");
return nullptr;
}
/// ParseOperation - Parse an operator. This returns null on error.
///
/// Operation ::= XOperator ['<' Type '>'] '(' Args ')'
///
Init *TGParser::ParseOperation(Record *CurRec, RecTy *ItemType) {
switch (Lex.getCode()) {
default:
TokError("unknown bang operator");
return nullptr;
case tgtok::XNOT:
case tgtok::XHead:
case tgtok::XTail:
case tgtok::XSize:
case tgtok::XEmpty:
case tgtok::XCast:
case tgtok::XGetDagOp: { // Value ::= !unop '(' Value ')'
UnOpInit::UnaryOp Code;
RecTy *Type = nullptr;
switch (Lex.getCode()) {
default: llvm_unreachable("Unhandled code!");
case tgtok::XCast:
Lex.Lex(); // eat the operation
Code = UnOpInit::CAST;
Type = ParseOperatorType();
if (!Type) {
TokError("did not get type for unary operator");
return nullptr;
}
break;
case tgtok::XNOT:
Lex.Lex(); // eat the operation
Code = UnOpInit::NOT;
Type = IntRecTy::get();
break;
case tgtok::XHead:
Lex.Lex(); // eat the operation
Code = UnOpInit::HEAD;
break;
case tgtok::XTail:
Lex.Lex(); // eat the operation
Code = UnOpInit::TAIL;
break;
case tgtok::XSize:
Lex.Lex();
Code = UnOpInit::SIZE;
Type = IntRecTy::get();
break;
case tgtok::XEmpty:
Lex.Lex(); // eat the operation
Code = UnOpInit::EMPTY;
Type = IntRecTy::get();
break;
case tgtok::XGetDagOp:
Lex.Lex(); // eat the operation
if (Lex.getCode() == tgtok::less) {
// Parse an optional type suffix, so that you can say
// !getdagop<BaseClass>(someDag) as a shorthand for
// !cast<BaseClass>(!getdagop(someDag)).
Type = ParseOperatorType();
if (!Type) {
TokError("did not get type for unary operator");
return nullptr;
}
if (!isa<RecordRecTy>(Type)) {
TokError("type for !getdagop must be a record type");
// but keep parsing, to consume the operand
}
} else {
Type = RecordRecTy::get({});
}
Code = UnOpInit::GETDAGOP;
break;
}
if (!consume(tgtok::l_paren)) {
TokError("expected '(' after unary operator");
return nullptr;
}
Init *LHS = ParseValue(CurRec);
if (!LHS) return nullptr;
if (Code == UnOpInit::EMPTY || Code == UnOpInit::SIZE) {
ListInit *LHSl = dyn_cast<ListInit>(LHS);
StringInit *LHSs = dyn_cast<StringInit>(LHS);
DagInit *LHSd = dyn_cast<DagInit>(LHS);
TypedInit *LHSt = dyn_cast<TypedInit>(LHS);
if (!LHSl && !LHSs && !LHSd && !LHSt) {
TokError("expected string, list, or dag type argument in unary operator");
return nullptr;
}
if (LHSt) {
ListRecTy *LType = dyn_cast<ListRecTy>(LHSt->getType());
StringRecTy *SType = dyn_cast<StringRecTy>(LHSt->getType());