mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-28 04:33:05 +00:00
6009425e88
Allow redefinitions of variables as long as they are of the same type. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7507 91177308-0d34-0410-b5e6-96231b3b80d8
503 lines
14 KiB
Plaintext
503 lines
14 KiB
Plaintext
//===-- FileParser.y - Parser for TableGen files ----------------*- C++ -*-===//
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//
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// This file implements the bison parser for Table Generator files...
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//
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//===------------------------------------------------------------------------=//
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%{
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#include "Record.h"
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#include "Support/StringExtras.h"
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#include <algorithm>
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#include <cstdio>
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#define YYERROR_VERBOSE 1
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int yyerror(const char *ErrorMsg);
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int yylex();
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extern int Filelineno;
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static Record *CurRec = 0;
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typedef std::pair<Record*, std::vector<Init*>*> SubClassRefTy;
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struct SetRecord {
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std::string Name;
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std::vector<unsigned> Bits;
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Init *Value;
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bool HasBits;
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SetRecord(const std::string &N, std::vector<unsigned> *B, Init *V)
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: Name(N), Value(V), HasBits(B != 0) {
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if (HasBits) Bits = *B;
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}
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};
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static std::vector<std::vector<SetRecord> > SetStack;
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extern std::ostream &err();
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static void addValue(const RecordVal &RV) {
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if (RecordVal *ERV = CurRec->getValue(RV.getName())) {
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// The value already exists in the class, treat this as a set...
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if (ERV->setValue(RV.getValue())) {
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err() << "New definition of '" << RV.getName() << "' of type '"
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<< *RV.getType() << "' is incompatible with previous "
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<< "definition of type '" << *ERV->getType() << "'!\n";
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abort();
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}
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} else {
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CurRec->addValue(RV);
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}
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}
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static void addSuperClass(Record *SC) {
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if (CurRec->isSubClassOf(SC)) {
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err() << "Already subclass of '" << SC->getName() << "'!\n";
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abort();
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}
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CurRec->addSuperClass(SC);
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}
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static void setValue(const std::string &ValName,
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std::vector<unsigned> *BitList, Init *V) {
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if (!V) return ;
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RecordVal *RV = CurRec->getValue(ValName);
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if (RV == 0) {
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err() << "Value '" << ValName << "' unknown!\n";
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abort();
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}
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// If we are assigning to a subset of the bits in the value... then we must be
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// assigning to a field of BitsRecTy, which must have a BitsInit
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// initializer...
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//
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if (BitList) {
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BitsInit *CurVal = dynamic_cast<BitsInit*>(RV->getValue());
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if (CurVal == 0) {
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err() << "Value '" << ValName << "' is not a bits type!\n";
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abort();
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}
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// Convert the incoming value to a bits type of the appropriate size...
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Init *BI = V->convertInitializerTo(new BitsRecTy(BitList->size()));
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if (BI == 0) {
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V->convertInitializerTo(new BitsRecTy(BitList->size()));
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err() << "Initializer '" << *V << "' not compatible with bit range!\n";
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abort();
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}
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// We should have a BitsInit type now...
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assert(dynamic_cast<BitsInit*>(BI) != 0 || &(std::cerr << *BI) == 0);
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BitsInit *BInit = (BitsInit*)BI;
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BitsInit *NewVal = new BitsInit(CurVal->getNumBits());
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// Loop over bits, assigning values as appropriate...
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for (unsigned i = 0, e = BitList->size(); i != e; ++i) {
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unsigned Bit = (*BitList)[i];
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if (NewVal->getBit(Bit)) {
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err() << "Cannot set bit #" << Bit << " of value '" << ValName
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<< "' more than once!\n";
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abort();
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}
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NewVal->setBit(Bit, BInit->getBit(i));
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}
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for (unsigned i = 0, e = CurVal->getNumBits(); i != e; ++i)
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if (NewVal->getBit(i) == 0)
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NewVal->setBit(i, CurVal->getBit(i));
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V = NewVal;
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}
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if (RV->setValue(V)) {
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err() << "Value '" << ValName << "' of type '" << *RV->getType()
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<< "' is incompatible with initializer '" << *V << "'!\n";
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abort();
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}
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}
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static void addSubClass(Record *SC, const std::vector<Init*> &TemplateArgs) {
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// Add all of the values in the subclass into the current class...
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const std::vector<RecordVal> &Vals = SC->getValues();
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for (unsigned i = 0, e = Vals.size(); i != e; ++i)
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addValue(Vals[i]);
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const std::vector<std::string> &TArgs = SC->getTemplateArgs();
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// Ensure that an appropriate number of template arguments are specified...
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if (TArgs.size() < TemplateArgs.size()) {
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err() << "ERROR: More template args specified than expected!\n";
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abort();
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} else { // This class expects template arguments...
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// Loop over all of the template arguments, setting them to the specified
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// value or leaving them as the default as neccesary.
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for (unsigned i = 0, e = TArgs.size(); i != e; ++i) {
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if (i < TemplateArgs.size()) { // A value is specified for this temp-arg?
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// Set it now.
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setValue(TArgs[i], 0, TemplateArgs[i]);
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} else if (!CurRec->getValue(TArgs[i])->getValue()->isComplete()) {
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err() << "ERROR: Value not specified for template argument #"
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<< i << " (" << TArgs[i] << ") of subclass '" << SC->getName()
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<< "'!\n";
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abort();
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}
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}
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}
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// Since everything went well, we can now set the "superclass" list for the
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// current record.
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const std::vector<Record*> &SCs = SC->getSuperClasses();
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for (unsigned i = 0, e = SCs.size(); i != e; ++i)
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addSuperClass(SCs[i]);
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addSuperClass(SC);
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}
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%}
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%union {
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std::string *StrVal;
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int IntVal;
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RecTy *Ty;
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Init *Initializer;
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std::vector<Init*> *FieldList;
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std::vector<Record*> *RecPtr;
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std::vector<unsigned>*BitList;
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Record *Rec;
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SubClassRefTy *SubClassRef;
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std::vector<SubClassRefTy> *SubClassList;
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};
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%token INT BIT STRING BITS LIST CODE CLASS DEF FIELD SET IN
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%token <IntVal> INTVAL
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%token <StrVal> ID STRVAL CODEFRAGMENT
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%type <Ty> Type
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%type <RecPtr> DefList DefListNE
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%type <Rec> ClassInst DefInst Object ObjectBody ClassID DefID
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%type <SubClassRef> SubClassRef
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%type <SubClassList> ClassList ClassListNE
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%type <IntVal> OptPrefix
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%type <Initializer> Value OptValue
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%type <FieldList> ValueList ValueListNE
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%type <BitList> BitList OptBitList RBitList
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%type <StrVal> Declaration OptID
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%start File
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%%
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ClassID : ID {
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$$ = Records.getClass(*$1);
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if ($$ == 0) {
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err() << "Couldn't find class '" << *$1 << "'!\n";
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abort();
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}
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delete $1;
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};
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DefID : ID {
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$$ = Records.getDef(*$1);
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if ($$ == 0) {
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err() << "Couldn't find def '" << *$1 << "'!\n";
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abort();
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}
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delete $1;
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};
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// TableGen types...
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Type : STRING { // string type
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$$ = new StringRecTy();
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} | BIT { // bit type
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$$ = new BitRecTy();
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} | BITS '<' INTVAL '>' { // bits<x> type
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$$ = new BitsRecTy($3);
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} | INT { // int type
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$$ = new IntRecTy();
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} | LIST '<' ClassID '>' { // list<x> type
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$$ = new ListRecTy($3);
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} | CODE { // code type
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$$ = new CodeRecTy();
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} | ClassID { // Record Type
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$$ = new RecordRecTy($1);
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};
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OptPrefix : /*empty*/ { $$ = 0; } | FIELD { $$ = 1; };
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OptValue : /*empty*/ { $$ = 0; } | '=' Value { $$ = $2; };
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Value : INTVAL {
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$$ = new IntInit($1);
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} | STRVAL {
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$$ = new StringInit(*$1);
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delete $1;
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} | CODEFRAGMENT {
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$$ = new CodeInit(*$1);
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delete $1;
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} | '?' {
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$$ = new UnsetInit();
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} | '{' ValueList '}' {
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BitsInit *Init = new BitsInit($2->size());
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for (unsigned i = 0, e = $2->size(); i != e; ++i) {
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struct Init *Bit = (*$2)[i]->convertInitializerTo(new BitRecTy());
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if (Bit == 0) {
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err() << "Element #" << i << " (" << *(*$2)[i]
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<< ") is not convertable to a bit!\n";
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abort();
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}
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Init->setBit($2->size()-i-1, Bit);
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}
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$$ = Init;
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delete $2;
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} | ID {
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if (CurRec == 0) {
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err() << "Def/Class name '" << *$1 << "' not allowed here!\n";
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abort();
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}
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if (const RecordVal *RV = CurRec->getValue(*$1)) {
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$$ = new VarInit(*$1, RV->getType());
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} else if (Record *D = Records.getDef(*$1)) {
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$$ = new DefInit(D);
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} else {
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err() << "Variable not defined: '" << *$1 << "'!\n";
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abort();
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}
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delete $1;
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} | Value '{' BitList '}' {
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$$ = $1->convertInitializerBitRange(*$3);
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if ($$ == 0) {
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err() << "Invalid bit range for value '" << *$1 << "'!\n";
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abort();
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}
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delete $3;
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} | '[' DefList ']' {
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$$ = new ListInit(*$2);
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delete $2;
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} | Value '.' ID {
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if (!$1->getFieldType(*$3)) {
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err() << "Cannot access field '" << *$3 << "' of value '" << *$1 << "!\n";
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abort();
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}
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$$ = new FieldInit($1, *$3);
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delete $3;
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};
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DefList : /*empty */ {
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$$ = new std::vector<Record*>();
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} | DefListNE {
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$$ = $1;
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};
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DefListNE : DefID {
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$$ = new std::vector<Record*>();
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$$->push_back($1);
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} | DefListNE ',' DefID {
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($$=$1)->push_back($3);
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};
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RBitList : INTVAL {
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$$ = new std::vector<unsigned>();
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$$->push_back($1);
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} | INTVAL '-' INTVAL {
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if ($1 < $3 || $1 < 0 || $3 < 0) {
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err() << "Invalid bit range: " << $1 << "-" << $3 << "!\n";
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abort();
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}
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$$ = new std::vector<unsigned>();
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for (int i = $1; i >= $3; --i)
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$$->push_back(i);
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} | INTVAL INTVAL {
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$2 = -$2;
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if ($1 < $2 || $1 < 0 || $2 < 0) {
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err() << "Invalid bit range: " << $1 << "-" << $2 << "!\n";
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abort();
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}
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$$ = new std::vector<unsigned>();
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for (int i = $1; i >= $2; --i)
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$$->push_back(i);
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} | RBitList ',' INTVAL {
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($$=$1)->push_back($3);
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} | RBitList ',' INTVAL '-' INTVAL {
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if ($3 < $5 || $3 < 0 || $5 < 0) {
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err() << "Invalid bit range: " << $3 << "-" << $5 << "!\n";
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abort();
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}
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$$ = $1;
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for (int i = $3; i >= $5; --i)
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$$->push_back(i);
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} | RBitList ',' INTVAL INTVAL {
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$4 = -$4;
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if ($3 < $4 || $3 < 0 || $4 < 0) {
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err() << "Invalid bit range: " << $3 << "-" << $4 << "!\n";
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abort();
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}
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$$ = $1;
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for (int i = $3; i >= $4; --i)
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$$->push_back(i);
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};
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BitList : RBitList { $$ = $1; std::reverse($1->begin(), $1->end()); };
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OptBitList : /*empty*/ { $$ = 0; } | '{' BitList '}' { $$ = $2; };
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ValueList : /*empty*/ {
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$$ = new std::vector<Init*>();
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} | ValueListNE {
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$$ = $1;
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};
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ValueListNE : Value {
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$$ = new std::vector<Init*>();
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$$->push_back($1);
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} | ValueListNE ',' Value {
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($$ = $1)->push_back($3);
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};
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Declaration : OptPrefix Type ID OptValue {
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addValue(RecordVal(*$3, $2, $1));
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setValue(*$3, 0, $4);
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$$ = $3;
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};
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BodyItem : Declaration ';' {
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delete $1;
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} | SET ID OptBitList '=' Value ';' {
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setValue(*$2, $3, $5);
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delete $2;
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delete $3;
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};
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BodyList : /*empty*/ | BodyList BodyItem;
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Body : ';' | '{' BodyList '}';
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SubClassRef : ClassID {
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$$ = new SubClassRefTy($1, new std::vector<Init*>());
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} | ClassID '<' ValueListNE '>' {
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$$ = new SubClassRefTy($1, $3);
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};
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ClassListNE : SubClassRef {
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$$ = new std::vector<SubClassRefTy>();
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$$->push_back(*$1);
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delete $1;
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}
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| ClassListNE ',' SubClassRef {
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($$=$1)->push_back(*$3);
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delete $3;
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};
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ClassList : /*empty */ {
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$$ = new std::vector<SubClassRefTy>();
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}
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| ':' ClassListNE {
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$$ = $2;
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};
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DeclListNE : Declaration {
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CurRec->addTemplateArg(*$1);
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delete $1;
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} | DeclListNE ',' Declaration {
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CurRec->addTemplateArg(*$3);
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delete $3;
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};
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TemplateArgList : '<' DeclListNE '>' {};
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OptTemplateArgList : /*empty*/ | TemplateArgList;
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OptID : ID { $$ = $1; } | /*empty*/ { $$ = new std::string(); };
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ObjectBody : OptID {
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static unsigned AnonCounter = 0;
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if ($1->empty())
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*$1 = "anonymous."+utostr(AnonCounter++);
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CurRec = new Record(*$1);
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delete $1;
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} OptTemplateArgList ClassList {
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for (unsigned i = 0, e = $4->size(); i != e; ++i) {
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addSubClass((*$4)[i].first, *(*$4)[i].second);
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// Delete the template arg values for the class
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delete (*$4)[i].second;
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}
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// Process any variables on the set stack...
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for (unsigned i = 0, e = SetStack.size(); i != e; ++i)
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for (unsigned j = 0, e = SetStack[i].size(); j != e; ++j)
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setValue(SetStack[i][j].Name,
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SetStack[i][j].HasBits ? &SetStack[i][j].Bits : 0,
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SetStack[i][j].Value);
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} Body {
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CurRec->resolveReferences();
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// Now that all of the references have been resolved, we can delete template
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// arguments for superclasses, so they don't pollute our record, and so that
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// their names won't conflict with later uses of the name...
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for (unsigned i = 0, e = $4->size(); i != e; ++i) {
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Record *SuperClass = (*$4)[i].first;
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for (unsigned i = 0, e = SuperClass->getTemplateArgs().size(); i != e; ++i)
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CurRec->removeValue(SuperClass->getTemplateArgs()[i]);
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}
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delete $4; // Delete the class list...
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$$ = CurRec;
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CurRec = 0;
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};
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ClassInst : CLASS ObjectBody {
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if (Records.getClass($2->getName())) {
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err() << "Class '" << $2->getName() << "' already defined!\n";
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abort();
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}
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Records.addClass($$ = $2);
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};
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DefInst : DEF ObjectBody {
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if (!$2->getTemplateArgs().empty()) {
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err() << "Def '" << $2->getName()
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<< "' is not permitted to have template arguments!\n";
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abort();
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}
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// If ObjectBody has template arguments, it's an error.
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if (Records.getDef($2->getName())) {
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err() << "Def '" << $2->getName() << "' already defined!\n";
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abort();
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}
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Records.addDef($$ = $2);
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};
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Object : ClassInst | DefInst;
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SETItem : ID OptBitList '=' Value {
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SetStack.back().push_back(SetRecord(*$1, $2, $4));
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delete $1; delete $2;
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};
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SETList : SETItem | SETList ',' SETItem;
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// SETCommand - A 'SET' statement start...
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SETCommand : SET { SetStack.push_back(std::vector<SetRecord>()); } SETList IN;
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// Support Set commands wrapping objects... both with and without braces.
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Object : SETCommand '{' ObjectList '}' {
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SetStack.pop_back();
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}
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| SETCommand Object {
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SetStack.pop_back();
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};
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ObjectList : Object {} | ObjectList Object {};
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File : ObjectList {};
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%%
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int yyerror(const char *ErrorMsg) {
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err() << "Error parsing: " << ErrorMsg << "\n";
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abort();
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}
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