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523 lines
16 KiB
Plaintext
Executable File
523 lines
16 KiB
Plaintext
Executable File
CHANGES FROM 1.31
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This file contains the migration of PCCTS from 1.31 in the order that
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changes were made. 1.32b7 is the last beta before full 1.32.
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Terence Parr, Parr Research Corporation 1995.
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======================================================================
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1.32b1
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Added Russell Quong to banner, changed banner for output slightly
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Fixed it so that you have before / after actions for C++ in class def
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Fixed bug in optimizer that made it sometimes forget to set internal
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token pointers. Only showed up when a {...} was in the "wrong spot".
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======================================================================
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1.32b2
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Added fixes by Dave Seidel for PC compilers in 32 bit mode (config.h
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and set.h).
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======================================================================
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1.32b3
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Fixed hideous bug in code generator for wildcard and for ~token op.
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from Dave Seidel
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Added pcnames.bat
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1. in antlr/main.c: change strcasecmp() to stricmp()
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2. in dlg/output.c: use DLEXER_C instead on "DLexer.C"
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3. in h/PBlackBox.h: use <iostream.h> instead of <stream.h>
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======================================================================
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1.32b4
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When the -ft option was used, any path prefix screwed up
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the gate on the .h files
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Fixed yet another bug due to the optimizer.
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The exception handling thing was a bit wacko:
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a : ( A B )? A B
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| A C
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;
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exception ...
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caused an exception if "A C" was the input. In other words,
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it found that A C didn't match the (A B)? pred and caused
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an exception rather than trying the next alt. All I did
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was to change the zzmatch_wsig() macros.
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Fixed some problems in gen.c relating to the name of token
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class bit sets in the output.
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Added the tremendously cool generalized predicate. For the
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moment, I'll give this bried description.
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a : <<predicate>>? blah
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| foo
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;
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This implies that (assuming blah and foo are syntactically
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ambiguous) "predicate" indicates the semantic validity of
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applying "blah". If "predicate" is false, "foo" is attempted.
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Previously, you had to say:
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a : <<LA(1)==ID ? predicate : 1>>? ID
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| ID
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;
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Now, you can simply use "predicate" without the ?: operator
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if you turn on ANTLR command line option: "-prc on". This
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tells ANTLR to compute that all by itself. It computes n
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tokens of lookahead where LT(n) or LATEXT(n) is the farthest
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ahead you look.
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If you give a predicate using "-prc on" that is followed
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by a construct that can recognize more than one n-sequence,
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you will get a warning from ANTLR. For example,
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a : <<isTypeName(LT(1)->getText())>>? (ID|INT)
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;
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This is wrong because the predicate will be applied to INTs
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as well as ID's. You should use this syntax to make
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the predicate more specific:
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a : (ID)? => <<isTypeName(LT(1)->getText())>>? (ID|INT)
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;
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which says "don't apply the predicate unless ID is the
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current lookahead context".
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You cannot currently have anything in the "(context)? =>"
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except sequences such as:
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( LPAREN ID | LPAREN SCOPE )? => <<pred>>?
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I haven't tested this THAT much, but it does work for the
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C++ grammar.
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======================================================================
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1.32b5
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Added getLine() to the ANTLRTokenBase and DLGBasedToken classes
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left line() for backward compatibility.
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----
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Removed SORCERER_TRANSFORM from the ast.h stuff.
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-------
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Fixed bug in code gen of ANTLR such that nested syn preds work more
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efficiently now. The ANTLRTokenBuffer was getting very large
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with nested predicates.
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------
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Memory leak is now gone from ANTLRTokenBuf; all tokens are deleted.
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For backward compatibility reasons, you have to say parser->deleteTokens()
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or mytokenbuffer->deleteTokens() but later it will be the default mode.
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Say this after the parser is constructed. E.g.,
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ParserBlackBox<DLGLexer, MyParser, ANTLRToken> p(stdin);
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p.parser()->deleteTokens();
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p.parser()->start_symbol();
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==============================
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1.32b6
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Changed so that deleteTokens() will do a delete ((ANTLRTokenBase *))
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on the ptr. This gets the virtual destructor.
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Fixed some weird things in the C++ header files (a few return types).
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Made the AST routines correspond to the book and SORCERER stuff.
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New token stuff: See testcpp/14/test.g
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ANTLR accepts a #pragma gc_tokens which says
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[1] Generate label = copy(LT(1)) instead of label=LT(1) for
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all labeled token references.
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[2] User now has to define ANTLRTokenPtr (as a class or a typedef
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to just a pointer) as well as the ANTLRToken class itself.
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See the example.
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To delete tokens in token buffer, use deleteTokens() message on parser.
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All tokens that fall off the ANTLRTokenBuffer get deleted
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which is what currently happens when deleteTokens() message
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has been sent to token buffer.
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We always generate ANTLRTokenPtr instead of 'ANTLRToken *' now.
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Then if no pragma set, ANTLR generates a
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class ANTLRToken;
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typedef ANTLRToken *ANTLRTokenPtr;
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in each file.
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Made a warning for x:rule_ref <<$x>>; still no warning for $i's, however.
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class BB {
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a : x:b y:A <<$x
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$y>>
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;
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b : B;
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}
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generates
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Antlr parser generator Version 1.32b6 1989-1995
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test.g, line 3: error: There are no token ptrs for rule references: '$x'
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===================
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1.32b7:
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[With respect to token object garbage collection (GC), 1.32b7
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backtracks from 1.32b6, but results in better and less intrusive GC.
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This is the last beta version before full 1.32.]
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BIGGEST CHANGES:
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o The "#pragma gc_tokens" is no longer used.
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o .C files are now .cpp files (hence, makefiles will have to
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be changed; or you can rerun genmk). This is a good move,
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but causes some backward incompatibility problems. You can
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avoid this by changing CPP_FILE_SUFFIX to ".C" in pccts/h/config.h.
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o The token object class hierarchy has been flattened to include
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only three classes: ANTLRAbstractToken, ANTLRCommonToken, and
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ANTLRCommonNoRefCountToken. The common token now does garbage
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collection via ref counting.
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o "Smart" pointers are now used for garbage collection. That is,
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ANTLRTokenPtr is used instead of "ANTLRToken *".
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o The antlr.1 man page has been cleaned up slightly.
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o The SUN C++ compiler now complains less about C++ support code.
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o Grammars which subclass ANTLRCommonToken must wrap all token
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pointer references in mytoken(token_ptr). This is the only
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serious backward incompatibility. See below.
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MINOR CHANGES:
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--------------------------------------------------------
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1 deleteTokens()
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The deleteTokens() message to the parser or token buffer has been changed
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to one of:
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void noGarbageCollectTokens() { inputTokens->noGarbageCollectTokens(); }
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void garbageCollectTokens() { inputTokens->garbageCollectTokens(); }
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The token buffer deletes all non-referenced tokens by default now.
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--------------------------------------------------------
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2 makeToken()
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The makeToken() message returns a new type. The function should look
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like:
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virtual ANTLRAbstractToken *makeToken(ANTLRTokenType tt,
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ANTLRChar *txt,
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int line)
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{
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ANTLRAbstractToken *t = new ANTLRCommonToken(tt,txt);
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t->setLine(line);
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return t;
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}
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--------------------------------------------------------
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3 TokenType
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Changed TokenType-> ANTLRTokenType (often forces changes in AST defs due
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to #[] constructor called to AST(tokentype, string)).
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--------------------------------------------------------
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4 AST()
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You must define AST(ANTLRTokenPtr t) now in your AST class definition.
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You might also have to include ATokPtr.h above the definition; e.g.,
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if AST is defined in a separate file, such as AST.h, it's a good idea
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to include ATOKPTR_H (ATokPtr.h). For example,
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#include ATOKPTR_H
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class AST : public ASTBase {
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protected:
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ANTLRTokenPtr token;
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public:
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AST(ANTLRTokenPtr t) { token = t; }
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void preorder_action() {
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char *s = token->getText();
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printf(" %s", s);
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}
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};
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Note the use of smart pointers rather than "ANTLRToken *".
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--------------------------------------------------------
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5 SUN C++
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From robertb oakhill.sps.mot.com Bob Bailey. Changed ANTLR C++ output
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to avoid an error in Sun C++ 3.0.1. Made "public" return value
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structs created to hold multiple return values public.
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--------------------------------------------------------
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6 genmk
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Fixed genmk so that target List.* is not included anymore. It's
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called SList.* anyway.
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--------------------------------------------------------
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7 \r vs \n
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Scott Vorthmann <vorth cmu.edu> fixed antlr.g in ANTLR so that \r
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is allowed as the return character as well as \n.
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--------------------------------------------------------
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8 Exceptions
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Bug in exceptions attached to labeled token/tokclass references. Didn't gen
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code for exceptions. This didn't work:
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a : "help" x:ID
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;
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exception[x]
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catch MismatchedToken : <<printf("eh?\n");>>
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Now ANTLR generates (which is kinda big, but necessary):
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if ( !_match_wsig(ID) ) {
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if ( guessing ) goto fail;
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_signal=MismatchedToken;
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switch ( _signal ) {
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case MismatchedToken :
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printf("eh?\n");
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_signal = NoSignal;
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break;
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default :
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goto _handler;
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}
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}
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which implies that you can recover and continue parsing after a missing/bad
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token reference.
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--------------------------------------------------------
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9 genmk
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genmk now correctly uses config file for CPP_FILE_SUFFIX stuff.
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--------------------------------------------------------
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10 general cleanup / PURIFY
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Anthony Green <green vizbiz.com> suggested a bunch of good general
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clean up things for the code; he also suggested a few things to
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help out the "PURIFY" memory allocation checker.
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--------------------------------------------------------
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11 $-variable references.
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Manuel ORNATO indicated that a $-variable outside of a rule caused
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ANTLR to crash. I fixed this.
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12 Tom Moog suggestion
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Fail action of semantic predicate needs "{}" envelope. FIXED.
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13 references to LT(1).
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I have enclosed all assignments such as:
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_t22 = (ANTLRTokenPtr)LT(1);
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in "if ( !guessing )" so that during backtracking the reference count
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for token objects is not increased.
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TOKEN OBJECT GARBAGE COLLECTION
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1 INTRODUCTION
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The class ANTLRCommonToken is now garbaged collected through a "smart"
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pointer called ANTLRTokenPtr using reference counting. Any token
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object not referenced by your grammar actions is destroyed by the
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ANTLRTokenBuffer when it must make room for more token objects.
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Referenced tokens are then destroyed in your parser when local
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ANTLRTokenPtr objects are deleted. For example,
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a : label:ID ;
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would be converted to something like:
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void yourclass::a(void)
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{
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zzRULE;
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ANTLRTokenPtr label=NULL; // used to be ANTLRToken *label;
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zzmatch(ID);
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label = (ANTLRTokenPtr)LT(1);
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consume();
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...
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}
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When the "label" object is destroyed (it's just a pointer to your
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input token object LT(1)), it decrements the reference count on the
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object created for the ID. If the count goes to zero, the object
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pointed by label is deleted.
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To correctly manage the garbage collection, you should use
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ANTLRTokenPtr instead of "ANTLRToken *". Most ANTLR support code
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(visible to the user) has been modified to use the smart pointers.
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***************************************************************
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Remember that any local objects that you create are not deleted when a
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lonjmp() is executed. Unfortunately, the syntactic predicates (...)?
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use setjmp()/longjmp(). There are some situations when a few tokens
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will "leak".
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***************************************************************
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2 DETAILS
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o The default is to perform token object garbage collection.
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You may use parser->noGarbageCollectTokens() to turn off
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garbage collection.
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o The type ANTLRTokenPtr is always defined now (automatically).
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If you do not wish to use smart pointers, you will have to
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redefined ANTLRTokenPtr by subclassing, changing the header
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file or changing ANTLR's code generation (easy enough to
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do in gen.c).
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o If you don't use ParserBlackBox, the new initialization sequence is:
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ANTLRTokenPtr aToken = new ANTLRToken;
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scan.setToken(mytoken(aToken));
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where mytoken(aToken) gets an ANTLRToken * from the smart pointer.
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o Define C++ preprocessor symbol DBG_REFCOUNTTOKEN to see a bunch of
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debugging stuff for reference counting if you suspect something.
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3 WHY DO I HAVE TO TYPECAST ALL MY TOKEN POINTERS NOW??????
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If you subclass ANTLRCommonToken and then attempt to refer to one of
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your token members via a token pointer in your grammar actions, the
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C++ compiler will complain that your token object does not have that
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member. For example, if you used to do this
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<<
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class ANTLRToken : public ANTLRCommonToken {
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int muck;
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...
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};
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>>
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class Foo {
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a : t:ID << t->muck = ...; >> ;
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}
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Now, you must do change the t->muck reference to:
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a : t:ID << mytoken(t)->muck = ...; >> ;
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in order to downcast 't' to be an "ANTLRToken *" not the
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"ANTLRAbstractToken *" resulting from ANTLRTokenPtr::operator->().
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The macro is defined as:
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/*
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* Since you cannot redefine operator->() to return one of the user's
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* token object types, we must down cast. This is a drag. Here's
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* a macro that helps. template: "mytoken(a-smart-ptr)->myfield".
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*/
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#define mytoken(tp) ((ANTLRToken *)(tp.operator->()))
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You have to use macro mytoken(grammar-label) now because smart
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pointers are not specific to a parser's token objects. In other
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words, the ANTLRTokenPtr class has a pointer to a generic
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ANTLRAbstractToken not your ANTLRToken; the ANTLR support code must
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use smart pointers too, but be able to work with any kind of
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ANTLRToken. Sorry about this, but it's C++'s fault not mine. Some
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nebulous future version of the C++ compilers should obviate the need
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to downcast smart pointers with runtime type checking (and by allowing
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different return type of overridden functions).
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A way to have backward compatible code is to shut off the token object
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garbage collection; i.e., use parser->noGarbageCollectTokens() and
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change the definition of ANTLRTokenPtr (that's why you get source code
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<wink>).
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PARSER EXCEPTION HANDLING
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I've noticed some weird stuff with the exception handling. I intend
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to give this top priority for the "book release" of ANTLR.
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==========
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1.32 Full Release
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o Changed Token class hierarchy to be (Thanks to Tom Moog):
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ANTLRAbstractToken
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ANTLRRefCountToken
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ANTLRCommonToken
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ANTLRNoRefCountCommonToken
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o Added virtual panic() to ANTLRAbstractToken. Made ANTLRParser::panic()
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virtual also.
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o Cleaned up the dup() stuff in AST hierarchy to use shallowCopy() to
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make node copies. John Farr at Medtronic suggested this. I.e.,
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if you want to use dup() with either ANTLR or SORCERER or -transform
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mode with SORCERER, you must defined shallowCopy() as:
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virtual PCCTS_AST *shallowCopy()
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{
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return new AST;
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p->setDown(NULL);
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p->setRight(NULL);
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return p;
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}
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or
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virtual PCCTS_AST *shallowCopy()
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{
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return new AST(*this);
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}
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if you have defined a copy constructor such as
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AST(const AST &t) // shallow copy constructor
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{
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token = t.token;
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iconst = t.iconst;
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setDown(NULL);
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setRight(NULL);
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}
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o Added a warning with -CC and -gk are used together. This is broken,
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hence a warning is appropriate.
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o Added warning when #-stuff is used w/o -gt option.
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o Updated MPW installation.
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o "Miller, Philip W." <MILLERPW f1groups.fsd.jhuapl.edu> suggested
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that genmk be use RENAME_OBJ_FLAG RENAME_EXE_FLAG instead of
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hardcoding "-o" in genmk.c.
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o made all exit() calls use EXIT_SUCCESS or EXIT_FAILURE.
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===========================================================================
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1.33
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EXIT_FAILURE and EXIT_SUCCESS were not always defined. I had to modify
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a bunch of files to use PCCTS_EXIT_XXX, which forces a new version. Sorry
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about that.
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