/
symtab.g
308 lines (276 loc) · 8.57 KB
/
symtab.g
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//
// Pascal Tree Grammar that walks tree, building symtab
//
// Adapted from,
// Pascal User Manual And Report (Second Edition-1978)
// Kathleen Jensen - Niklaus Wirth
//
// By
//
// Hakki Dogusan dogusanh@tr-net.net.tr
//
// Then significantly enhanced by Piet Schoutteten
// with some guidance by Terence Parr. Piet added tree
// construction, and some tree walkers.
//
// partially converted into ANTLR 3 format in June 2010 by Marton Papp
// known problem: it does not work because many rules are missing and it is still
//in ANTLR 2.
tree grammar symtab;
options {
tokenVocab = pascal;
ASTLabelType = 'PascalAST';
}
@header{
import java.util.*;
import java.io.*;
}
//class SymtabPhase extends PascalTreeParserSuper;
@members
{
Stack scopes = new Stack();
Stack usesScopes = new Stack();
//public static File thisUnit;
public File thisUnit;
}
program
: programHeading
block
{System.out.println(scopes.peek());}
;
programHeading
: ^(PROGRAM IDENT identifierList?)
{Scope root = new Scope(null);
scopes.push(root);}
| ^(UNIT IDENT)
{
Scope root = new Scope(null); // create new scope
scopes.push(root); // enter new scope :)
root.addSymbol(new Unit(#IDENT.getText())); // create unit symbol entry
String tUnit = new String (#IDENT.getText());
tUnit = tUnit.concat(".sym");
thisUnit = new File (PascalParser.translateFilePath, tUnit);
}
;
block
: ( labelDeclarationPart
| constantDefinitionPart
| typeDefinitionPart
| variableDeclarationPart
| procedureAndFunctionDeclarationPart
| usesUnitsPart
| IMPLEMENTATION
{ System.out.println(scopes.peek());
//write symbol table and exit when currentFileName != translateFileName
if (PascalParser.currentFileName.compareTo(PascalParser.translateFileName) != 0) {
try{
ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(thisUnit));
oos.writeObject(scopes);
oos.close();
}
catch (IOException e) {
System.err.println("IOexception: "+e); }
_t = null;
throw new RecognitionException();
}
}
)*
compoundStatement
;
usesUnitsPart
@init{
String usesFile, usesSymtab;
String oldUsesFile;
File f, symFile;
Object readSymtab = new Stack();
}
: ^(USES usesList=identifierList)
// walk identifierList and make symbol table
{
usesList = (PascalAST) usesList.getFirstChild();
oldUsesFile = PascalParser.currentFileName;
while (usesList !=null) {
// make symboltable for usesFile
usesFile = usesList.getText();
usesFile = usesFile.concat(".pas");
usesSymtab = usesList.getText();
usesSymtab = usesSymtab.concat(".sym");
f = new File(PascalParser.translateFilePath,usesFile);
symFile = new File(PascalParser.translateFilePath,usesSymtab);
// we have to build the symbol table when ...
if (( !(symFile.exists() ) )
// this .sym file (usesSymtyb) does not exist or ...
|| ((f.lastModified()) > (symFile.lastModified()) ) ){
// the date of this .sym file (usesSymtyb) is older than the .pas file (usesFile)
try {
PascalParser.parseFile(f.getName(),new FileInputStream(f));
}
catch (Exception e) {
System.err.println("parser exception: "+e);
e.printStackTrace(); // so we can get stack trace
}
}
// read serialized symbol table and add to symbol table "usesScopes"
File symTab = new File (PascalParser.translateFilePath , usesSymtab);
try {
ObjectInputStream ois = new ObjectInputStream(new FileInputStream(symTab));
readSymtab = ois.readObject();
ois.close();
}
catch (ClassNotFoundException cnfe) {
System.err.println("parser exception: "+cnfe);
cnfe.printStackTrace(); // so we can get stack trace
}
catch (FileNotFoundException e) {
System.err.println("parser exception: "+e);
e.printStackTrace(); // so we can get stack trace
}
catch (IOException e) {
System.err.println("parser exception: "+e);
e.printStackTrace(); // so we can get stack trace
}
Stack symTabToPop = (Stack) readSymtab;
// add uses symbol table "readSymtab" to symboltable "usesScopes"
while (!(symTabToPop.empty())) {
usesScopes.push(symTabToPop.pop());
}
usesList = (PascalAST) usesList.getNextSibling();
}
PascalParser.currentFileName = oldUsesFile;
}
;
constantDefinition
@init{
Constant c = null;
}
: ^(r=EQUAL IDENT c=constant)
{
if ( c!=null ) {
Scope sc = (Scope)scopes.peek();
c.setName(#IDENT.getText());
sc.addSymbol(c);
r.symbol = c; // AST def root points to symbol table entry now
}
}
;
constant returns [Constant c=null]
: NUM_INT
{c = new IntegerConstant(#NUM_INT.getText());}
| NUM_REAL
{c = new RealConstant(#NUM_REAL.getText());}
| ^( PLUS
( NUM_INT
{c = new IntegerConstant(#NUM_INT.getText());}
| NUM_REAL
{c = new RealConstant(#NUM_REAL.getText());}
| IDENT
)
)
| ^( MINUS
( NUM_INT
{c = new IntegerConstant(#NUM_INT.getText());}
| NUM_REAL
{c = new RealConstant(#NUM_REAL.getText());}
| IDENT
)
)
| IDENT
| STRING_LITERAL
| ^(CHR (NUM_INT|NUM_REAL))
;
typeDefinition
@init{
TypeSpecifier t=null;
}
: ^(TYPEDECL IDENT
( type
| ^(r=FUNCTION (formalParameterList)? t=resultType)
{
if ( t!=null ) {r.symbol = t;}
}
| ^(PROCEDURE (formalParameterList)?)
)
)
;
type returns [TypeSpecifier ts=null]
: ^(SCALARTYPE identifierList)
| ^(DOTDOT constant constant)
| ts2=typeIdentifier
| structuredType
| ^(POINTER typeIdentifier)
;
typeIdentifier returns [TypeSpecifier ts=null]
: IDENT // lookup and return type spec
| CHAR
| BOOLEAN
| INTEGER {ts=PascalParser.symbolTable.getPredefinedType("integer");}
| REAL {ts=PascalParser.symbolTable.getPredefinedType("real");}
| ^( STRING
( IDENT
| NUM_INT
| NUM_REAL
|
)
)
;
variableDeclaration
@init{
Vector ids=null;
TypeSpecifier t=null;
}
: ^(r=VARDECL ids=identifierList t=type)
{
// walk list of identifiers, creating variable syms and setting types
if ( t!=null ) {
Scope sc = (Scope)scopes.peek();
for (int i=0; ids!=null && i<ids.size(); i++) {
String id = (String)ids.elementAt(i);
Variable v = new Variable(id,t);
sc.addSymbol(v);
r.symbol = t; // AST def root points to symbol table entry now
}
}
}
;
parameterGroup
@init{
Vector ids=null;
TypeSpecifier t=null;
}
: ^(r=ARGDECL ids=identifierList t=typeIdentifier)
{
// walk list of identifiers, creating variable syms and setting types
if ( t!=null ) {
Scope sc = (Scope)scopes.peek();
for (int i=0; ids!=null && i<ids.size(); i++) {
String id = (String)ids.elementAt(i);
Variable v = new Variable(id,t);
sc.addSymbol(v);
r.symbol = t; // AST def root points to symbol table entry now
}
}
}
;
identifierList returns [Vector ids=new Vector()]
: ^( IDLIST ( IDENT {ids.addElement(#IDENT.getText());} )+ )
;
functionDeclaration
@init{
TypeSpecifier t=null;
}
: ^(r=FUNCTION IDENT (formalParameterList)? t=resultType block)
{
if ( t!=null ) {r.symbol = t;}
}
;
formalParameterList
: ^(ARGDECLS formalParameterSection+) ;
formalParameterSection
: parameterGroup
| ^(VAR parameterGroup)
| ^(FUNCTION parameterGroup)
| ^(PROCEDURE parameterGroup)
;
resultType returns [TypeSpecifier ts=null]
: ts2=typeIdentifier
;