X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/f57a753663ecb42c6c261a7542e28695b920fb70..a6ca4ce2292277b4af21b5069bded9c73341d23a:/doc/bison.texinfo?ds=sidebyside diff --git a/doc/bison.texinfo b/doc/bison.texinfo index c39c325b..8f40afbe 100644 --- a/doc/bison.texinfo +++ b/doc/bison.texinfo @@ -30,11 +30,12 @@ @copying -This manual is for @acronym{GNU} Bison (version @value{VERSION}, -@value{UPDATED}), the @acronym{GNU} parser generator. +This manual (@value{UPDATED}) is for @acronym{GNU} Bison (version +@value{VERSION}), the @acronym{GNU} parser generator. Copyright @copyright{} 1988, 1989, 1990, 1991, 1992, 1993, 1995, 1998, -1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc. +1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Free +Software Foundation, Inc. @quotation Permission is granted to copy, distribute and/or modify this document @@ -45,10 +46,10 @@ being ``A @acronym{GNU} Manual,'' and with the Back-Cover Texts as in (a) below. A copy of the license is included in the section entitled ``@acronym{GNU} Free Documentation License.'' -(a) The @acronym{FSF}'s Back-Cover Text is: ``You have freedom to copy -and modify this @acronym{GNU} Manual, like @acronym{GNU} software. -Copies published by the Free Software Foundation raise funds for -@acronym{GNU} development.'' +(a) The FSF's Back-Cover Text is: ``You have the freedom to copy and +modify this @acronym{GNU} manual. Buying copies from the @acronym{FSF} +supports it in developing @acronym{GNU} and promoting software +freedom.'' @end quotation @end copying @@ -88,76 +89,76 @@ Cover art by Etienne Suvasa. @menu * Introduction:: * Conditions:: -* Copying:: The @acronym{GNU} General Public License says - how you can copy and share Bison +* Copying:: The @acronym{GNU} General Public License says + how you can copy and share Bison. Tutorial sections: -* Concepts:: Basic concepts for understanding Bison. -* Examples:: Three simple explained examples of using Bison. +* Concepts:: Basic concepts for understanding Bison. +* Examples:: Three simple explained examples of using Bison. Reference sections: -* Grammar File:: Writing Bison declarations and rules. -* Interface:: C-language interface to the parser function @code{yyparse}. -* Algorithm:: How the Bison parser works at run-time. -* Error Recovery:: Writing rules for error recovery. +* Grammar File:: Writing Bison declarations and rules. +* Interface:: C-language interface to the parser function @code{yyparse}. +* Algorithm:: How the Bison parser works at run-time. +* Error Recovery:: Writing rules for error recovery. * Context Dependency:: What to do if your language syntax is too - messy for Bison to handle straightforwardly. -* Debugging:: Understanding or debugging Bison parsers. -* Invocation:: How to run Bison (to produce the parser source file). -* Other Languages:: Creating C++ and Java parsers. -* FAQ:: Frequently Asked Questions -* Table of Symbols:: All the keywords of the Bison language are explained. -* Glossary:: Basic concepts are explained. -* Copying This Manual:: License for copying this manual. -* Index:: Cross-references to the text. + messy for Bison to handle straightforwardly. +* Debugging:: Understanding or debugging Bison parsers. +* Invocation:: How to run Bison (to produce the parser source file). +* Other Languages:: Creating C++ and Java parsers. +* FAQ:: Frequently Asked Questions +* Table of Symbols:: All the keywords of the Bison language are explained. +* Glossary:: Basic concepts are explained. +* Copying This Manual:: License for copying this manual. +* Index:: Cross-references to the text. @detailmenu --- The Detailed Node Listing --- The Concepts of Bison -* Language and Grammar:: Languages and context-free grammars, - as mathematical ideas. -* Grammar in Bison:: How we represent grammars for Bison's sake. -* Semantic Values:: Each token or syntactic grouping can have - a semantic value (the value of an integer, - the name of an identifier, etc.). -* Semantic Actions:: Each rule can have an action containing C code. -* GLR Parsers:: Writing parsers for general context-free languages. -* Locations Overview:: Tracking Locations. -* Bison Parser:: What are Bison's input and output, - how is the output used? -* Stages:: Stages in writing and running Bison grammars. -* Grammar Layout:: Overall structure of a Bison grammar file. +* Language and Grammar:: Languages and context-free grammars, + as mathematical ideas. +* Grammar in Bison:: How we represent grammars for Bison's sake. +* Semantic Values:: Each token or syntactic grouping can have + a semantic value (the value of an integer, + the name of an identifier, etc.). +* Semantic Actions:: Each rule can have an action containing C code. +* GLR Parsers:: Writing parsers for general context-free languages. +* Locations Overview:: Tracking Locations. +* Bison Parser:: What are Bison's input and output, + how is the output used? +* Stages:: Stages in writing and running Bison grammars. +* Grammar Layout:: Overall structure of a Bison grammar file. Writing @acronym{GLR} Parsers -* Simple GLR Parsers:: Using @acronym{GLR} parsers on unambiguous grammars. -* Merging GLR Parses:: Using @acronym{GLR} parsers to resolve ambiguities. -* GLR Semantic Actions:: Deferred semantic actions have special concerns. -* Compiler Requirements:: @acronym{GLR} parsers require a modern C compiler. +* Simple GLR Parsers:: Using @acronym{GLR} parsers on unambiguous grammars. +* Merging GLR Parses:: Using @acronym{GLR} parsers to resolve ambiguities. +* GLR Semantic Actions:: Deferred semantic actions have special concerns. +* Compiler Requirements:: @acronym{GLR} parsers require a modern C compiler. Examples -* RPN Calc:: Reverse polish notation calculator; - a first example with no operator precedence. -* Infix Calc:: Infix (algebraic) notation calculator. - Operator precedence is introduced. +* RPN Calc:: Reverse polish notation calculator; + a first example with no operator precedence. +* Infix Calc:: Infix (algebraic) notation calculator. + Operator precedence is introduced. * Simple Error Recovery:: Continuing after syntax errors. * Location Tracking Calc:: Demonstrating the use of @@@var{n} and @@$. -* Multi-function Calc:: Calculator with memory and trig functions. - It uses multiple data-types for semantic values. -* Exercises:: Ideas for improving the multi-function calculator. +* Multi-function Calc:: Calculator with memory and trig functions. + It uses multiple data-types for semantic values. +* Exercises:: Ideas for improving the multi-function calculator. Reverse Polish Notation Calculator -* Decls: Rpcalc Decls. Prologue (declarations) for rpcalc. -* Rules: Rpcalc Rules. Grammar Rules for rpcalc, with explanation. -* Lexer: Rpcalc Lexer. The lexical analyzer. -* Main: Rpcalc Main. The controlling function. -* Error: Rpcalc Error. The error reporting function. -* Gen: Rpcalc Gen. Running Bison on the grammar file. -* Comp: Rpcalc Compile. Run the C compiler on the output code. +* Rpcalc Declarations:: Prologue (declarations) for rpcalc. +* Rpcalc Rules:: Grammar Rules for rpcalc, with explanation. +* Rpcalc Lexer:: The lexical analyzer. +* Rpcalc Main:: The controlling function. +* Rpcalc Error:: The error reporting function. +* Rpcalc Generate:: Running Bison on the grammar file. +* Rpcalc Compile:: Run the C compiler on the output code. Grammar Rules for @code{rpcalc} @@ -167,15 +168,15 @@ Grammar Rules for @code{rpcalc} Location Tracking Calculator: @code{ltcalc} -* Decls: Ltcalc Decls. Bison and C declarations for ltcalc. -* Rules: Ltcalc Rules. Grammar rules for ltcalc, with explanations. -* Lexer: Ltcalc Lexer. The lexical analyzer. +* Ltcalc Declarations:: Bison and C declarations for ltcalc. +* Ltcalc Rules:: Grammar rules for ltcalc, with explanations. +* Ltcalc Lexer:: The lexical analyzer. Multi-Function Calculator: @code{mfcalc} -* Decl: Mfcalc Decl. Bison declarations for multi-function calculator. -* Rules: Mfcalc Rules. Grammar rules for the calculator. -* Symtab: Mfcalc Symtab. Symbol table management subroutines. +* Mfcalc Declarations:: Bison declarations for multi-function calculator. +* Mfcalc Rules:: Grammar rules for the calculator. +* Mfcalc Symbol Table:: Symbol table management subroutines. Bison Grammar Files @@ -190,11 +191,11 @@ Bison Grammar Files Outline of a Bison Grammar -* Prologue:: Syntax and usage of the prologue. +* Prologue:: Syntax and usage of the prologue. * Prologue Alternatives:: Syntax and usage of alternatives to the prologue. -* Bison Declarations:: Syntax and usage of the Bison declarations section. -* Grammar Rules:: Syntax and usage of the grammar rules section. -* Epilogue:: Syntax and usage of the epilogue. +* Bison Declarations:: Syntax and usage of the Bison declarations section. +* Grammar Rules:: Syntax and usage of the grammar rules section. +* Epilogue:: Syntax and usage of the epilogue. Defining Language Semantics @@ -224,28 +225,33 @@ Bison Declarations * Expect Decl:: Suppressing warnings about parsing conflicts. * Start Decl:: Specifying the start symbol. * Pure Decl:: Requesting a reentrant parser. +* Push Decl:: Requesting a push parser. * Decl Summary:: Table of all Bison declarations. Parser C-Language Interface -* Parser Function:: How to call @code{yyparse} and what it returns. -* Lexical:: You must supply a function @code{yylex} - which reads tokens. -* Error Reporting:: You must supply a function @code{yyerror}. -* Action Features:: Special features for use in actions. -* Internationalization:: How to let the parser speak in the user's - native language. +* Parser Function:: How to call @code{yyparse} and what it returns. +* Push Parser Function:: How to call @code{yypush_parse} and what it returns. +* Pull Parser Function:: How to call @code{yypull_parse} and what it returns. +* Parser Create Function:: How to call @code{yypstate_new} and what it returns. +* Parser Delete Function:: How to call @code{yypstate_delete} and what it returns. +* Lexical:: You must supply a function @code{yylex} + which reads tokens. +* Error Reporting:: You must supply a function @code{yyerror}. +* Action Features:: Special features for use in actions. +* Internationalization:: How to let the parser speak in the user's + native language. The Lexical Analyzer Function @code{yylex} * Calling Convention:: How @code{yyparse} calls @code{yylex}. -* Token Values:: How @code{yylex} must return the semantic value - of the token it has read. -* Token Locations:: How @code{yylex} must return the text location - (line number, etc.) of the token, if the - actions want that. -* Pure Calling:: How the calling convention differs - in a pure parser (@pxref{Pure Decl, ,A Pure (Reentrant) Parser}). +* Token Values:: How @code{yylex} must return the semantic value + of the token it has read. +* Token Locations:: How @code{yylex} must return the text location + (line number, etc.) of the token, if the + actions want that. +* Pure Calling:: How the calling convention differs in a pure parser + (@pxref{Pure Decl, ,A Pure (Reentrant) Parser}). The Bison Parser Algorithm @@ -255,14 +261,15 @@ The Bison Parser Algorithm * Contextual Precedence:: When an operator's precedence depends on context. * Parser States:: The parser is a finite-state-machine with stack. * Reduce/Reduce:: When two rules are applicable in the same situation. -* Mystery Conflicts:: Reduce/reduce conflicts that look unjustified. +* Mystery Conflicts:: Reduce/reduce conflicts that look unjustified. * Generalized LR Parsing:: Parsing arbitrary context-free grammars. * Memory Management:: What happens when memory is exhausted. How to avoid it. Operator Precedence * Why Precedence:: An example showing why precedence is needed. -* Using Precedence:: How to specify precedence in Bison grammars. +* Using Precedence:: How to specify precedence and associativity. +* Precedence Only:: How to specify precedence only. * Precedence Examples:: How these features are used in the previous example. * How Precedence:: How they work. @@ -309,31 +316,33 @@ A Complete C++ Example Java Parsers -* Java Bison Interface:: Asking for Java parser generation -* Java Semantic Values:: %type and %token vs. Java -* Java Location Values:: The position and location classes -* Java Parser Interface:: Instantiating and running the parser -* Java Scanner Interface:: Java scanners, and pure parsers -* Java Differences:: Differences between C/C++ and Java Grammars +* Java Bison Interface:: Asking for Java parser generation +* Java Semantic Values:: %type and %token vs. Java +* Java Location Values:: The position and location classes +* Java Parser Interface:: Instantiating and running the parser +* Java Scanner Interface:: Specifying the scanner for the parser +* Java Action Features:: Special features for use in actions +* Java Differences:: Differences between C/C++ and Java Grammars +* Java Declarations Summary:: List of Bison declarations used with Java Frequently Asked Questions -* Memory Exhausted:: Breaking the Stack Limits -* How Can I Reset the Parser:: @code{yyparse} Keeps some State -* Strings are Destroyed:: @code{yylval} Loses Track of Strings -* Implementing Gotos/Loops:: Control Flow in the Calculator -* Multiple start-symbols:: Factoring closely related grammars -* Secure? Conform?:: Is Bison @acronym{POSIX} safe? -* I can't build Bison:: Troubleshooting -* Where can I find help?:: Troubleshouting -* Bug Reports:: Troublereporting -* Other Languages:: Parsers in Java and others -* Beta Testing:: Experimenting development versions -* Mailing Lists:: Meeting other Bison users +* Memory Exhausted:: Breaking the Stack Limits +* How Can I Reset the Parser:: @code{yyparse} Keeps some State +* Strings are Destroyed:: @code{yylval} Loses Track of Strings +* Implementing Gotos/Loops:: Control Flow in the Calculator +* Multiple start-symbols:: Factoring closely related grammars +* Secure? Conform?:: Is Bison @acronym{POSIX} safe? +* I can't build Bison:: Troubleshooting +* Where can I find help?:: Troubleshouting +* Bug Reports:: Troublereporting +* More Languages:: Parsers in C++, Java, and so on +* Beta Testing:: Experimenting development versions +* Mailing Lists:: Meeting other Bison users Copying This Manual -* GNU Free Documentation License:: License for copying this manual. +* Copying This Manual:: License for copying this manual. @end detailmenu @end menu @@ -343,10 +352,12 @@ Copying This Manual @cindex introduction @dfn{Bison} is a general-purpose parser generator that converts an -annotated context-free grammar into an @acronym{LALR}(1) or -@acronym{GLR} parser for that grammar. Once you are proficient with -Bison, you can use it to develop a wide range of language parsers, from those -used in simple desk calculators to complex programming languages. +annotated context-free grammar into a deterministic or @acronym{GLR} +parser employing @acronym{LALR}(1), @acronym{IELR}(1), or canonical +@acronym{LR}(1) parser tables. +Once you are proficient with Bison, you can use it to develop a wide +range of language parsers, from those used in simple desk calculators to +complex programming languages. Bison is upward compatible with Yacc: all properly-written Yacc grammars ought to work with Bison with no change. Anyone familiar with Yacc @@ -401,7 +412,9 @@ inspecting the file for text beginning with ``As a special exception@dots{}''. The text spells out the exact terms of the exception. -@include gpl.texi +@node Copying +@unnumbered GNU GENERAL PUBLIC LICENSE +@include gpl-3.0.texi @node Concepts @chapter The Concepts of Bison @@ -411,19 +424,19 @@ details of Bison will not make sense. If you do not already know how to use Bison or Yacc, we suggest you start by reading this chapter carefully. @menu -* Language and Grammar:: Languages and context-free grammars, - as mathematical ideas. -* Grammar in Bison:: How we represent grammars for Bison's sake. -* Semantic Values:: Each token or syntactic grouping can have - a semantic value (the value of an integer, - the name of an identifier, etc.). -* Semantic Actions:: Each rule can have an action containing C code. -* GLR Parsers:: Writing parsers for general context-free languages. -* Locations Overview:: Tracking Locations. -* Bison Parser:: What are Bison's input and output, - how is the output used? -* Stages:: Stages in writing and running Bison grammars. -* Grammar Layout:: Overall structure of a Bison grammar file. +* Language and Grammar:: Languages and context-free grammars, + as mathematical ideas. +* Grammar in Bison:: How we represent grammars for Bison's sake. +* Semantic Values:: Each token or syntactic grouping can have + a semantic value (the value of an integer, + the name of an identifier, etc.). +* Semantic Actions:: Each rule can have an action containing C code. +* GLR Parsers:: Writing parsers for general context-free languages. +* Locations Overview:: Tracking Locations. +* Bison Parser:: What are Bison's input and output, + how is the output used? +* Stages:: Stages in writing and running Bison grammars. +* Grammar Layout:: Overall structure of a Bison grammar file. @end menu @node Language and Grammar @@ -450,26 +463,27 @@ order to specify the language Algol 60. Any grammar expressed in essentially machine-readable @acronym{BNF}. @cindex @acronym{LALR}(1) grammars +@cindex @acronym{IELR}(1) grammars @cindex @acronym{LR}(1) grammars -There are various important subclasses of context-free grammar. Although it -can handle almost all context-free grammars, Bison is optimized for what -are called @acronym{LALR}(1) grammars. -In brief, in these grammars, it must be possible to -tell how to parse any portion of an input string with just a single -token of lookahead. Strictly speaking, that is a description of an -@acronym{LR}(1) grammar, and @acronym{LALR}(1) involves additional -restrictions that are -hard to explain simply; but it is rare in actual practice to find an -@acronym{LR}(1) grammar that fails to be @acronym{LALR}(1). +There are various important subclasses of context-free grammars. +Although it can handle almost all context-free grammars, Bison is +optimized for what are called @acronym{LR}(1) grammars. +In brief, in these grammars, it must be possible to tell how to parse +any portion of an input string with just a single token of lookahead. +For historical reasons, Bison by default is limited by the additional +restrictions of @acronym{LALR}(1), which is hard to explain simply. @xref{Mystery Conflicts, ,Mysterious Reduce/Reduce Conflicts}, for more information on this. +To escape these additional restrictions, you can request +@acronym{IELR}(1) or canonical @acronym{LR}(1) parser tables. +@xref{Decl Summary,,lr.type}, to learn how. @cindex @acronym{GLR} parsing @cindex generalized @acronym{LR} (@acronym{GLR}) parsing @cindex ambiguous grammars @cindex nondeterministic parsing -Parsers for @acronym{LALR}(1) grammars are @dfn{deterministic}, meaning +Parsers for @acronym{LR}(1) grammars are @dfn{deterministic}, meaning roughly that the next grammar rule to apply at any point in the input is uniquely determined by the preceding input and a fixed, finite portion (called a @dfn{lookahead}) of the remaining input. A context-free @@ -698,8 +712,8 @@ from the values of the two subexpressions. @cindex shift/reduce conflicts @cindex reduce/reduce conflicts -In some grammars, Bison's standard -@acronym{LALR}(1) parsing algorithm cannot decide whether to apply a +In some grammars, Bison's deterministic +@acronym{LR}(1) parsing algorithm cannot decide whether to apply a certain grammar rule at a given point. That is, it may not be able to decide (on the basis of the input read so far) which of two possible reductions (applications of a grammar rule) applies, or whether to apply @@ -708,13 +722,13 @@ input. These are known respectively as @dfn{reduce/reduce} conflicts (@pxref{Reduce/Reduce}), and @dfn{shift/reduce} conflicts (@pxref{Shift/Reduce}). -To use a grammar that is not easily modified to be @acronym{LALR}(1), a +To use a grammar that is not easily modified to be @acronym{LR}(1), a more general parsing algorithm is sometimes necessary. If you include @code{%glr-parser} among the Bison declarations in your file (@pxref{Grammar Outline}), the result is a Generalized @acronym{LR} (@acronym{GLR}) parser. These parsers handle Bison grammars that contain no unresolved conflicts (i.e., after applying precedence -declarations) identically to @acronym{LALR}(1) parsers. However, when +declarations) identically to deterministic parsers. However, when faced with unresolved shift/reduce and reduce/reduce conflicts, @acronym{GLR} parsers use the simple expedient of doing both, effectively cloning the parser to follow both possibilities. Each of @@ -739,10 +753,10 @@ user-defined function on the resulting values to produce an arbitrary merged result. @menu -* Simple GLR Parsers:: Using @acronym{GLR} parsers on unambiguous grammars. -* Merging GLR Parses:: Using @acronym{GLR} parsers to resolve ambiguities. -* GLR Semantic Actions:: Deferred semantic actions have special concerns. -* Compiler Requirements:: @acronym{GLR} parsers require a modern C compiler. +* Simple GLR Parsers:: Using @acronym{GLR} parsers on unambiguous grammars. +* Merging GLR Parses:: Using @acronym{GLR} parsers to resolve ambiguities. +* GLR Semantic Actions:: Deferred semantic actions have special concerns. +* Compiler Requirements:: @acronym{GLR} parsers require a modern C compiler. @end menu @node Simple GLR Parsers @@ -756,11 +770,8 @@ merged result. @cindex shift/reduce conflicts In the simplest cases, you can use the @acronym{GLR} algorithm -to parse grammars that are unambiguous, but fail to be @acronym{LALR}(1). -Such grammars typically require more than one symbol of lookahead, -or (in rare cases) fall into the category of grammars in which the -@acronym{LALR}(1) algorithm throws away too much information (they are in -@acronym{LR}(1), but not @acronym{LALR}(1), @ref{Mystery Conflicts}). +to parse grammars that are unambiguous but fail to be @acronym{LR}(1). +Such grammars typically require more than one symbol of lookahead. Consider a problem that arises in the declaration of enumerated and subrange types in the @@ -797,7 +808,7 @@ type enum = (a); valid, and more-complicated cases can come up in practical programs.) These two declarations look identical until the @samp{..} token. -With normal @acronym{LALR}(1) one-token lookahead it is not +With normal @acronym{LR}(1) one-token lookahead it is not possible to decide between the two forms when the identifier @samp{a} is parsed. It is, however, desirable for a parser to decide this, since in the latter case @@ -836,9 +847,9 @@ reports a syntax error as usual. The effect of all this is that the parser seems to ``guess'' the correct branch to take, or in other words, it seems to use more -lookahead than the underlying @acronym{LALR}(1) algorithm actually allows -for. In this example, @acronym{LALR}(2) would suffice, but also some cases -that are not @acronym{LALR}(@math{k}) for any @math{k} can be handled this way. +lookahead than the underlying @acronym{LR}(1) algorithm actually allows +for. In this example, @acronym{LR}(2) would suffice, but also some cases +that are not @acronym{LR}(@math{k}) for any @math{k} can be handled this way. In general, a @acronym{GLR} parser can take quadratic or cubic worst-case time, and the current Bison parser even takes exponential time and space @@ -891,7 +902,7 @@ expr : '(' expr ')' @end group @end example -When used as a normal @acronym{LALR}(1) grammar, Bison correctly complains +When used as a normal @acronym{LR}(1) grammar, Bison correctly complains about one reduce/reduce conflict. In the conflicting situation the parser chooses one of the alternatives, arbitrarily the one declared first. Therefore the following correct input is not @@ -923,7 +934,7 @@ there are at least two potential problems to beware. First, always analyze the conflicts reported by Bison to make sure that @acronym{GLR} splitting is only done where it is intended. A @acronym{GLR} parser splitting inadvertently may cause problems less obvious than an -@acronym{LALR} parser statically choosing the wrong alternative in a +@acronym{LR} parser statically choosing the wrong alternative in a conflict. Second, consider interactions with the lexer (@pxref{Semantic Tokens}) with great care. Since a split parser consumes tokens without performing any actions during the split, the lexer cannot obtain @@ -1143,7 +1154,7 @@ Another Bison feature requiring special consideration is @code{YYERROR} (@pxref{Action Features}), which you can invoke in a semantic action to initiate error recovery. During deterministic @acronym{GLR} operation, the effect of @code{YYERROR} is -the same as its effect in an @acronym{LALR}(1) parser. +the same as its effect in a deterministic parser. In a deferred semantic action, its effect is undefined. @c The effect is probably a syntax error at the split point. @@ -1370,15 +1381,15 @@ languages are written the same way. You can copy these examples into a source file to try them. @menu -* RPN Calc:: Reverse polish notation calculator; - a first example with no operator precedence. -* Infix Calc:: Infix (algebraic) notation calculator. - Operator precedence is introduced. +* RPN Calc:: Reverse polish notation calculator; + a first example with no operator precedence. +* Infix Calc:: Infix (algebraic) notation calculator. + Operator precedence is introduced. * Simple Error Recovery:: Continuing after syntax errors. * Location Tracking Calc:: Demonstrating the use of @@@var{n} and @@$. -* Multi-function Calc:: Calculator with memory and trig functions. - It uses multiple data-types for semantic values. -* Exercises:: Ideas for improving the multi-function calculator. +* Multi-function Calc:: Calculator with memory and trig functions. + It uses multiple data-types for semantic values. +* Exercises:: Ideas for improving the multi-function calculator. @end menu @node RPN Calc @@ -1397,16 +1408,16 @@ The source code for this calculator is named @file{rpcalc.y}. The @samp{.y} extension is a convention used for Bison input files. @menu -* Decls: Rpcalc Decls. Prologue (declarations) for rpcalc. -* Rules: Rpcalc Rules. Grammar Rules for rpcalc, with explanation. -* Lexer: Rpcalc Lexer. The lexical analyzer. -* Main: Rpcalc Main. The controlling function. -* Error: Rpcalc Error. The error reporting function. -* Gen: Rpcalc Gen. Running Bison on the grammar file. -* Comp: Rpcalc Compile. Run the C compiler on the output code. +* Rpcalc Declarations:: Prologue (declarations) for rpcalc. +* Rpcalc Rules:: Grammar Rules for rpcalc, with explanation. +* Rpcalc Lexer:: The lexical analyzer. +* Rpcalc Main:: The controlling function. +* Rpcalc Error:: The error reporting function. +* Rpcalc Generate:: Running Bison on the grammar file. +* Rpcalc Compile:: Run the C compiler on the output code. @end menu -@node Rpcalc Decls +@node Rpcalc Declarations @subsection Declarations for @code{rpcalc} Here are the C and Bison declarations for the reverse polish notation @@ -1656,7 +1667,7 @@ therefore, @code{NUM} becomes a macro for @code{yylex} to use. The semantic value of the token (if it has one) is stored into the global variable @code{yylval}, which is where the Bison parser will look for it. (The C data type of @code{yylval} is @code{YYSTYPE}, which was -defined at the beginning of the grammar; @pxref{Rpcalc Decls, +defined at the beginning of the grammar; @pxref{Rpcalc Declarations, ,Declarations for @code{rpcalc}}.) A token type code of zero is returned if the end-of-input is encountered. @@ -1752,7 +1763,7 @@ have not written any error rules in this example, so any invalid input will cause the calculator program to exit. This is not clean behavior for a real calculator, but it is adequate for the first example. -@node Rpcalc Gen +@node Rpcalc Generate @subsection Running Bison to Make the Parser @cindex running Bison (introduction) @@ -1852,8 +1863,8 @@ parentheses nested to arbitrary depth. Here is the Bison code for %token NUM %left '-' '+' %left '*' '/' -%left NEG /* negation--unary minus */ -%right '^' /* exponentiation */ +%precedence NEG /* negation--unary minus */ +%right '^' /* exponentiation */ %% /* The grammar follows. */ input: /* empty */ @@ -1886,15 +1897,16 @@ In the second section (Bison declarations), @code{%left} declares token types and says they are left-associative operators. The declarations @code{%left} and @code{%right} (right associativity) take the place of @code{%token} which is used to declare a token type name without -associativity. (These tokens are single-character literals, which +associativity/precedence. (These tokens are single-character literals, which ordinarily don't need to be declared. We declare them here to specify -the associativity.) +the associativity/precedence.) Operator precedence is determined by the line ordering of the declarations; the higher the line number of the declaration (lower on the page or screen), the higher the precedence. Hence, exponentiation has the highest precedence, unary minus (@code{NEG}) is next, followed -by @samp{*} and @samp{/}, and so on. @xref{Precedence, ,Operator +by @samp{*} and @samp{/}, and so on. Unary minus is not associative, +only precedence matters (@code{%precedence}. @xref{Precedence, ,Operator Precedence}. The other important new feature is the @code{%prec} in the grammar @@ -1971,12 +1983,12 @@ most of the work needed to use locations will be done in the lexical analyzer. @menu -* Decls: Ltcalc Decls. Bison and C declarations for ltcalc. -* Rules: Ltcalc Rules. Grammar rules for ltcalc, with explanations. -* Lexer: Ltcalc Lexer. The lexical analyzer. +* Ltcalc Declarations:: Bison and C declarations for ltcalc. +* Ltcalc Rules:: Grammar rules for ltcalc, with explanations. +* Ltcalc Lexer:: The lexical analyzer. @end menu -@node Ltcalc Decls +@node Ltcalc Declarations @subsection Declarations for @code{ltcalc} The C and Bison declarations for the location tracking calculator are @@ -1997,7 +2009,7 @@ the same as the declarations for the infix notation calculator. %left '-' '+' %left '*' '/' -%left NEG +%precedence NEG %right '^' %% /* The grammar follows. */ @@ -2212,12 +2224,12 @@ $ Note that multiple assignment and nested function calls are permitted. @menu -* Decl: Mfcalc Decl. Bison declarations for multi-function calculator. -* Rules: Mfcalc Rules. Grammar rules for the calculator. -* Symtab: Mfcalc Symtab. Symbol table management subroutines. +* Mfcalc Declarations:: Bison declarations for multi-function calculator. +* Mfcalc Rules:: Grammar rules for the calculator. +* Mfcalc Symbol Table:: Symbol table management subroutines. @end menu -@node Mfcalc Decl +@node Mfcalc Declarations @subsection Declarations for @code{mfcalc} Here are the C and Bison declarations for the multi-function calculator. @@ -2245,8 +2257,8 @@ Here are the C and Bison declarations for the multi-function calculator. %right '=' %left '-' '+' %left '*' '/' -%left NEG /* negation--unary minus */ -%right '^' /* exponentiation */ +%precedence NEG /* negation--unary minus */ +%right '^' /* exponentiation */ @end group %% /* The grammar follows. */ @end smallexample @@ -2313,7 +2325,7 @@ exp: NUM @{ $$ = $1; @} %% @end smallexample -@node Mfcalc Symtab +@node Mfcalc Symbol Table @subsection The @code{mfcalc} Symbol Table @cindex symbol table example @@ -2626,11 +2638,11 @@ As a @acronym{GNU} extension, @samp{//} introduces a comment that continues until end of line. @menu -* Prologue:: Syntax and usage of the prologue. +* Prologue:: Syntax and usage of the prologue. * Prologue Alternatives:: Syntax and usage of alternatives to the prologue. -* Bison Declarations:: Syntax and usage of the Bison declarations section. -* Grammar Rules:: Syntax and usage of the grammar rules section. -* Epilogue:: Syntax and usage of the epilogue. +* Bison Declarations:: Syntax and usage of the Bison declarations section. +* Grammar Rules:: Syntax and usage of the grammar rules section. +* Epilogue:: Syntax and usage of the epilogue. @end menu @node Prologue @@ -2694,9 +2706,6 @@ feature test macros can affect the behavior of Bison-generated @findex %code requires @findex %code provides @findex %code top -(The prologue alternatives described here are experimental. -More user feedback will help to determine whether they should become permanent -features.) The functionality of @var{Prologue} sections can often be subtle and inflexible. @@ -2956,6 +2965,8 @@ type: You could even place each of the above directive groups in the rules section of the grammar file next to the set of rules that uses the associated semantic type. +(In the rules section, you must terminate each of those directives with a +semicolon.) And you don't have to worry that some directive (like a @code{%union}) in the definitions section is going to adversely affect their functionality in some counter-intuitive manner just because it comes first. @@ -3039,8 +3050,12 @@ A @dfn{nonterminal symbol} stands for a class of syntactically equivalent groupings. The symbol name is used in writing grammar rules. By convention, it should be all lower case. -Symbol names can contain letters, digits (not at the beginning), -underscores and periods. Periods make sense only in nonterminals. +Symbol names can contain letters, underscores, periods, dashes, and (not +at the beginning) digits. Dashes in symbol names are a GNU +extension, incompatible with @acronym{POSIX} Yacc. Terminal symbols +that contain periods or dashes make little sense: since they are not +valid symbols (in most programming languages) they are not exported as +token names. There are three ways of writing terminal symbols in the grammar: @@ -3791,8 +3806,11 @@ typedef struct YYLTYPE @} YYLTYPE; @end example -At the beginning of the parsing, Bison initializes all these fields to 1 -for @code{yylloc}. +When @code{YYLTYPE} is not defined, at the beginning of the parsing, Bison +initializes all these fields to 1 for @code{yylloc}. To initialize +@code{yylloc} with a custom location type (or to chose a different +initialization), use the @code{%initial-action} directive. @xref{Initial +Action Decl, , Performing Actions before Parsing}. @node Actions and Locations @subsection Actions and Locations @@ -3976,6 +3994,7 @@ Grammars}). * Expect Decl:: Suppressing warnings about parsing conflicts. * Start Decl:: Specifying the start symbol. * Pure Decl:: Requesting a reentrant parser. +* Push Decl:: Requesting a push parser. * Decl Summary:: Table of all Bison declarations. @end menu @@ -4010,13 +4029,14 @@ Bison will convert this into a @code{#define} directive in the parser, so that the function @code{yylex} (if it is in this file) can use the name @var{name} to stand for this token type's code. -Alternatively, you can use @code{%left}, @code{%right}, or +Alternatively, you can use @code{%left}, @code{%right}, +@code{%precedence}, or @code{%nonassoc} instead of @code{%token}, if you wish to specify associativity and precedence. @xref{Precedence Decl, ,Operator Precedence}. You can explicitly specify the numeric code for a token type by appending -a decimal or hexadecimal integer value in the field immediately +a nonnegative decimal or hexadecimal integer value in the field immediately following the token name: @example @@ -4069,6 +4089,16 @@ Once you equate the literal string and the token name, you can use them interchangeably in further declarations or the grammar rules. The @code{yylex} function can use the token name or the literal string to obtain the token type code number (@pxref{Calling Convention}). +Syntax error messages passed to @code{yyerror} from the parser will reference +the literal string instead of the token name. + +The token numbered as 0 corresponds to end of file; the following line +allows for nicer error messages referring to ``end of file'' instead +of ``$end'': + +@example +%token END 0 "end of file" +@end example @node Precedence Decl @subsection Operator Precedence @@ -4076,13 +4106,14 @@ obtain the token type code number (@pxref{Calling Convention}). @cindex declaring operator precedence @cindex operator precedence, declaring -Use the @code{%left}, @code{%right} or @code{%nonassoc} declaration to +Use the @code{%left}, @code{%right}, @code{%nonassoc}, or +@code{%precedence} declaration to declare a token and specify its precedence and associativity, all at once. These are called @dfn{precedence declarations}. @xref{Precedence, ,Operator Precedence}, for general information on operator precedence. -The syntax of a precedence declaration is the same as that of +The syntax of a precedence declaration is nearly the same as that of @code{%token}: either @example @@ -4112,6 +4143,10 @@ left-associativity (grouping @var{x} with @var{y} first) and means that @samp{@var{x} @var{op} @var{y} @var{op} @var{z}} is considered a syntax error. +@code{%precedence} gives only precedence to the @var{symbols}, and +defines no associativity at all. Use this to define precedence only, +and leave any potential conflict due to associativity enabled. + @item The precedence of an operator determines how it nests with other operators. All the tokens declared in a single precedence declaration have equal @@ -4120,6 +4155,18 @@ When two tokens declared in different precedence declarations associate, the one declared later has the higher precedence and is grouped first. @end itemize +For backward compatibility, there is a confusing difference between the +argument lists of @code{%token} and precedence declarations. +Only a @code{%token} can associate a literal string with a token type name. +A precedence declaration always interprets a literal string as a reference to a +separate token. +For example: + +@example +%left OR "<=" // Does not declare an alias. +%left OR 134 "<=" 135 // Declares 134 for OR and 135 for "<=". +@end example + @node Union Decl @subsection The Collection of Value Types @cindex declaring value types @@ -4396,7 +4443,7 @@ The parser can @dfn{return immediately} because of an explicit call to @code{YYABORT} or @code{YYACCEPT}, or failed error recovery, or memory exhaustion. -Right-hand size symbols of a rule that explicitly triggers a syntax +Right-hand side symbols of a rule that explicitly triggers a syntax error via @code{YYERROR} are not discarded automatically. As a rule of thumb, destructors are invoked only when user actions cannot manage the memory. @@ -4428,7 +4475,7 @@ be @var{n} shift/reduce conflicts and no reduce/reduce conflicts. Bison reports an error if the number of shift/reduce conflicts differs from @var{n}, or if there are any reduce/reduce conflicts. -For normal @acronym{LALR}(1) parsers, reduce/reduce conflicts are more +For deterministic parsers, reduce/reduce conflicts are more serious, and should be eliminated entirely. Bison will always report reduce/reduce conflicts for these parsers. With @acronym{GLR} parsers, however, both kinds of conflicts are routine; otherwise, @@ -4481,7 +4528,7 @@ may override this restriction with the @code{%start} declaration as follows: @subsection A Pure (Reentrant) Parser @cindex reentrant parser @cindex pure parser -@findex %pure-parser +@findex %define api.pure A @dfn{reentrant} program is one which does not alter in the course of execution; in other words, it consists entirely of @dfn{pure} (read-only) @@ -4497,19 +4544,20 @@ statically allocated variables for communication with @code{yylex}, including @code{yylval} and @code{yylloc}.) Alternatively, you can generate a pure, reentrant parser. The Bison -declaration @code{%pure-parser} says that you want the parser to be +declaration @samp{%define api.pure} says that you want the parser to be reentrant. It looks like this: @example -%pure-parser +%define api.pure @end example The result is that the communication variables @code{yylval} and @code{yylloc} become local variables in @code{yyparse}, and a different calling convention is used for the lexical analyzer function @code{yylex}. @xref{Pure Calling, ,Calling Conventions for Pure -Parsers}, for the details of this. The variable @code{yynerrs} also -becomes local in @code{yyparse} (@pxref{Error Reporting, ,The Error +Parsers}, for the details of this. The variable @code{yynerrs} +becomes local in @code{yyparse} in pull mode but it becomes a member +of yypstate in push mode. (@pxref{Error Reporting, ,The Error Reporting Function @code{yyerror}}). The convention for calling @code{yyparse} itself is unchanged. @@ -4517,6 +4565,116 @@ Whether the parser is pure has nothing to do with the grammar rules. You can generate either a pure parser or a nonreentrant parser from any valid grammar. +@node Push Decl +@subsection A Push Parser +@cindex push parser +@cindex push parser +@findex %define api.push-pull + +(The current push parsing interface is experimental and may evolve. +More user feedback will help to stabilize it.) + +A pull parser is called once and it takes control until all its input +is completely parsed. A push parser, on the other hand, is called +each time a new token is made available. + +A push parser is typically useful when the parser is part of a +main event loop in the client's application. This is typically +a requirement of a GUI, when the main event loop needs to be triggered +within a certain time period. + +Normally, Bison generates a pull parser. +The following Bison declaration says that you want the parser to be a push +parser (@pxref{Decl Summary,,%define api.push-pull}): + +@example +%define api.push-pull push +@end example + +In almost all cases, you want to ensure that your push parser is also +a pure parser (@pxref{Pure Decl, ,A Pure (Reentrant) Parser}). The only +time you should create an impure push parser is to have backwards +compatibility with the impure Yacc pull mode interface. Unless you know +what you are doing, your declarations should look like this: + +@example +%define api.pure +%define api.push-pull push +@end example + +There is a major notable functional difference between the pure push parser +and the impure push parser. It is acceptable for a pure push parser to have +many parser instances, of the same type of parser, in memory at the same time. +An impure push parser should only use one parser at a time. + +When a push parser is selected, Bison will generate some new symbols in +the generated parser. @code{yypstate} is a structure that the generated +parser uses to store the parser's state. @code{yypstate_new} is the +function that will create a new parser instance. @code{yypstate_delete} +will free the resources associated with the corresponding parser instance. +Finally, @code{yypush_parse} is the function that should be called whenever a +token is available to provide the parser. A trivial example +of using a pure push parser would look like this: + +@example +int status; +yypstate *ps = yypstate_new (); +do @{ + status = yypush_parse (ps, yylex (), NULL); +@} while (status == YYPUSH_MORE); +yypstate_delete (ps); +@end example + +If the user decided to use an impure push parser, a few things about +the generated parser will change. The @code{yychar} variable becomes +a global variable instead of a variable in the @code{yypush_parse} function. +For this reason, the signature of the @code{yypush_parse} function is +changed to remove the token as a parameter. A nonreentrant push parser +example would thus look like this: + +@example +extern int yychar; +int status; +yypstate *ps = yypstate_new (); +do @{ + yychar = yylex (); + status = yypush_parse (ps); +@} while (status == YYPUSH_MORE); +yypstate_delete (ps); +@end example + +That's it. Notice the next token is put into the global variable @code{yychar} +for use by the next invocation of the @code{yypush_parse} function. + +Bison also supports both the push parser interface along with the pull parser +interface in the same generated parser. In order to get this functionality, +you should replace the @samp{%define api.push-pull push} declaration with the +@samp{%define api.push-pull both} declaration. Doing this will create all of +the symbols mentioned earlier along with the two extra symbols, @code{yyparse} +and @code{yypull_parse}. @code{yyparse} can be used exactly as it normally +would be used. However, the user should note that it is implemented in the +generated parser by calling @code{yypull_parse}. +This makes the @code{yyparse} function that is generated with the +@samp{%define api.push-pull both} declaration slower than the normal +@code{yyparse} function. If the user +calls the @code{yypull_parse} function it will parse the rest of the input +stream. It is possible to @code{yypush_parse} tokens to select a subgrammar +and then @code{yypull_parse} the rest of the input stream. If you would like +to switch back and forth between between parsing styles, you would have to +write your own @code{yypull_parse} function that knows when to quit looking +for input. An example of using the @code{yypull_parse} function would look +like this: + +@example +yypstate *ps = yypstate_new (); +yypull_parse (ps); /* Will call the lexer */ +yypstate_delete (ps); +@end example + +Adding the @samp{%define api.pure} declaration does exactly the same thing to +the generated parser with @samp{%define api.push-pull both} as it did for +@samp{%define api.push-pull push}. + @node Decl Summary @subsection Bison Declaration Summary @cindex Bison declaration summary @@ -4595,10 +4753,6 @@ Thus, @code{%code} replaces the traditional Yacc prologue, For a detailed discussion, see @ref{Prologue Alternatives}. For Java, the default location is inside the parser class. - -(Like all the Yacc prologue alternatives, this directive is experimental. -More user feedback will help to determine whether it should become a permanent -feature.) @end deffn @deffn {Directive} %code @var{qualifier} @{@var{code}@} @@ -4609,11 +4763,13 @@ use this form instead. @var{qualifier} identifies the purpose of @var{code} and thus the location(s) where Bison should generate it. -Not all values of @var{qualifier} are available for all target languages: +Not all @var{qualifier}s are accepted for all target languages. +Unaccepted @var{qualifier}s produce an error. +Some of the accepted @var{qualifier}s are: @itemize @bullet -@findex %code requires @item requires +@findex %code requires @itemize @bullet @item Language(s): C, C++ @@ -4676,32 +4832,496 @@ before any class definitions. @end itemize @end itemize -(Like all the Yacc prologue alternatives, this directive is experimental. -More user feedback will help to determine whether it should become a permanent -feature.) - @cindex Prologue For a detailed discussion of how to use @code{%code} in place of the traditional Yacc prologue for C/C++, see @ref{Prologue Alternatives}. @end deffn @deffn {Directive} %debug -In the parser file, define the macro @code{YYDEBUG} to 1 if it is not -already defined, so that the debugging facilities are compiled. -@end deffn +Instrument the output parser for traces. Obsoleted by @samp{%define +parse.trace}. @xref{Tracing, ,Tracing Your Parser}. +@end deffn @deffn {Directive} %define @var{variable} +@deffnx {Directive} %define @var{variable} @var{value} @deffnx {Directive} %define @var{variable} "@var{value}" -Define a variable to adjust Bison's behavior. The possible choices for -@var{variable}, as well as their meanings, depend on the selected target -language and/or the parser skeleton (@pxref{Decl Summary,,%language}). +Define a variable to adjust Bison's behavior. + +It is an error if a @var{variable} is defined by @code{%define} multiple +times, but see @ref{Bison Options,,-D @var{name}[=@var{value}]}. + +@var{value} must be placed in quotation marks if it contains any +character other than a letter, underscore, period, dash, or non-initial +digit. + +Omitting @code{"@var{value}"} entirely is always equivalent to specifying +@code{""}. + +Some @var{variable}s take Boolean values. +In this case, Bison will complain if the variable definition does not meet one +of the following four conditions: + +@enumerate +@item @code{@var{value}} is @code{true} + +@item @code{@var{value}} is omitted (or @code{""} is specified). +This is equivalent to @code{true}. + +@item @code{@var{value}} is @code{false}. + +@item @var{variable} is never defined. +In this case, Bison selects a default value. +@end enumerate + +What @var{variable}s are accepted, as well as their meanings and default +values, depend on the selected target language and/or the parser +skeleton (@pxref{Decl Summary,,%language}, @pxref{Decl +Summary,,%skeleton}). +Unaccepted @var{variable}s produce an error. +Some of the accepted @var{variable}s are: + +@table @code +@c ================================================== api.namespace +@item api.namespace +@findex %define api.namespace +@itemize +@item Languages(s): C++ + +@item Purpose: Specifies the namespace for the parser class. +For example, if you specify: + +@smallexample +%define api.namespace "foo::bar" +@end smallexample + +Bison uses @code{foo::bar} verbatim in references such as: + +@smallexample +foo::bar::parser::semantic_type +@end smallexample + +However, to open a namespace, Bison removes any leading @code{::} and then +splits on any remaining occurrences: + +@smallexample +namespace foo @{ namespace bar @{ + class position; + class location; +@} @} +@end smallexample + +@item Accepted Values: +Any absolute or relative C++ namespace reference without a trailing +@code{"::"}. For example, @code{"foo"} or @code{"::foo::bar"}. + +@item Default Value: +The value specified by @code{%name-prefix}, which defaults to @code{yy}. +This usage of @code{%name-prefix} is for backward compatibility and can +be confusing since @code{%name-prefix} also specifies the textual prefix +for the lexical analyzer function. Thus, if you specify +@code{%name-prefix}, it is best to also specify @samp{%define +api.namespace} so that @code{%name-prefix} @emph{only} affects the +lexical analyzer function. For example, if you specify: + +@smallexample +%define api.namespace "foo" +%name-prefix "bar::" +@end smallexample + +The parser namespace is @code{foo} and @code{yylex} is referenced as +@code{bar::lex}. +@end itemize +@c namespace + + + +@c ================================================== api.pure +@item api.pure +@findex %define api.pure + +@itemize @bullet +@item Language(s): C + +@item Purpose: Request a pure (reentrant) parser program. +@xref{Pure Decl, ,A Pure (Reentrant) Parser}. + +@item Accepted Values: Boolean + +@item Default Value: @code{false} +@end itemize +@c api.pure + + + +@c ================================================== api.push-pull +@item api.push-pull +@findex %define api.push-pull + +@itemize @bullet +@item Language(s): C (deterministic parsers only) + +@item Purpose: Requests a pull parser, a push parser, or both. +@xref{Push Decl, ,A Push Parser}. +(The current push parsing interface is experimental and may evolve. +More user feedback will help to stabilize it.) + +@item Accepted Values: @code{pull}, @code{push}, @code{both} + +@item Default Value: @code{pull} +@end itemize +@c api.push-pull + + + +@c ================================================== api.tokens.prefix +@item api.tokens.prefix +@findex %define api.tokens.prefix + +@itemize +@item Languages(s): all + +@item Purpose: +Add a prefix to the token names when generating their definition in the +target language. For instance + +@example +%token FILE for ERROR +%define api.tokens.prefix "TOK_" +%% +start: FILE for ERROR; +@end example + +@noindent +generates the definition of the symbols @code{TOK_FILE}, @code{TOK_for}, +and @code{TOK_ERROR} in the generated source files. In particular, the +scanner must use these prefixed token names, while the grammar itself +may still use the short names (as in the sample rule given above). The +generated informational files (@file{*.output}, @file{*.xml}, +@file{*.dot}) are not modified by this prefix. See @ref{Calc++ Parser} +and @ref{Calc++ Scanner}, for a complete example. + +@item Accepted Values: +Any string. Should be a valid identifier prefix in the target language, +in other words, it should typically be an identifier itself (sequence of +letters, underscores, and ---not at the beginning--- digits). + +@item Default Value: +empty +@end itemize +@c api.tokens.prefix + + +@c ================================================== lex_symbol +@item variant +@findex %define lex_symbol + +@itemize @bullet +@item Language(s): +C++ + +@item Purpose: +When variant-based semantic values are enabled (@pxref{C++ Variants}), +request that symbols be handled as a whole (type, value, and possibly +location) in the scanner. @xref{Complete Symbols}, for details. + +@item Accepted Values: +Boolean. + +@item Default Value: +@code{false} +@end itemize +@c lex_symbol + + +@c ================================================== lr.default-reductions + +@item lr.default-reductions +@cindex default reductions +@findex %define lr.default-reductions +@cindex delayed syntax errors +@cindex syntax errors delayed + +@itemize @bullet +@item Language(s): all + +@item Purpose: Specifies the kind of states that are permitted to +contain default reductions. +That is, in such a state, Bison declares the reduction with the largest +lookahead set to be the default reduction and then removes that +lookahead set. +The advantages of default reductions are discussed below. +The disadvantage is that, when the generated parser encounters a +syntactically unacceptable token, the parser might then perform +unnecessary default reductions before it can detect the syntax error. + +(This feature is experimental. +More user feedback will help to stabilize it.) + +@item Accepted Values: +@itemize +@item @code{all}. +For @acronym{LALR} and @acronym{IELR} parsers (@pxref{Decl +Summary,,lr.type}) by default, all states are permitted to contain +default reductions. +The advantage is that parser table sizes can be significantly reduced. +The reason Bison does not by default attempt to address the disadvantage +of delayed syntax error detection is that this disadvantage is already +inherent in @acronym{LALR} and @acronym{IELR} parser tables. +That is, unlike in a canonical @acronym{LR} state, the lookahead sets of +reductions in an @acronym{LALR} or @acronym{IELR} state can contain +tokens that are syntactically incorrect for some left contexts. + +@item @code{consistent}. +@cindex consistent states +A consistent state is a state that has only one possible action. +If that action is a reduction, then the parser does not need to request +a lookahead token from the scanner before performing that action. +However, the parser only recognizes the ability to ignore the lookahead +token when such a reduction is encoded as a default reduction. +Thus, if default reductions are permitted in and only in consistent +states, then a canonical @acronym{LR} parser reports a syntax error as +soon as it @emph{needs} the syntactically unacceptable token from the +scanner. + +@item @code{accepting}. +@cindex accepting state +By default, the only default reduction permitted in a canonical +@acronym{LR} parser is the accept action in the accepting state, which +the parser reaches only after reading all tokens from the input. +Thus, the default canonical @acronym{LR} parser reports a syntax error +as soon as it @emph{reaches} the syntactically unacceptable token +without performing any extra reductions. +@end itemize + +@item Default Value: +@itemize +@item @code{accepting} if @code{lr.type} is @code{canonical-lr}. +@item @code{all} otherwise. +@end itemize +@end itemize + +@c ============================================ lr.keep-unreachable-states + +@item lr.keep-unreachable-states +@findex %define lr.keep-unreachable-states + +@itemize @bullet +@item Language(s): all + +@item Purpose: Requests that Bison allow unreachable parser states to remain in +the parser tables. +Bison considers a state to be unreachable if there exists no sequence of +transitions from the start state to that state. +A state can become unreachable during conflict resolution if Bison disables a +shift action leading to it from a predecessor state. +Keeping unreachable states is sometimes useful for analysis purposes, but they +are useless in the generated parser. + +@item Accepted Values: Boolean + +@item Default Value: @code{false} + +@item Caveats: + +@itemize @bullet + +@item Unreachable states may contain conflicts and may use rules not used in +any other state. +Thus, keeping unreachable states may induce warnings that are irrelevant to +your parser's behavior, and it may eliminate warnings that are relevant. +Of course, the change in warnings may actually be relevant to a parser table +analysis that wants to keep unreachable states, so this behavior will likely +remain in future Bison releases. + +@item While Bison is able to remove unreachable states, it is not guaranteed to +remove other kinds of useless states. +Specifically, when Bison disables reduce actions during conflict resolution, +some goto actions may become useless, and thus some additional states may +become useless. +If Bison were to compute which goto actions were useless and then disable those +actions, it could identify such states as unreachable and then remove those +states. +However, Bison does not compute which goto actions are useless. +@end itemize +@end itemize +@c lr.keep-unreachable-states + +@c ================================================== lr.type + +@item lr.type +@findex %define lr.type +@cindex @acronym{LALR} +@cindex @acronym{IELR} +@cindex @acronym{LR} + +@itemize @bullet +@item Language(s): all + +@item Purpose: Specifies the type of parser tables within the +@acronym{LR}(1) family. +(This feature is experimental. +More user feedback will help to stabilize it.) + +@item Accepted Values: +@itemize +@item @code{lalr}. +While Bison generates @acronym{LALR} parser tables by default for +historical reasons, @acronym{IELR} or canonical @acronym{LR} is almost +always preferable for deterministic parsers. +The trouble is that @acronym{LALR} parser tables can suffer from +mysterious conflicts and thus may not accept the full set of sentences +that @acronym{IELR} and canonical @acronym{LR} accept. +@xref{Mystery Conflicts}, for details. +However, there are at least two scenarios where @acronym{LALR} may be +worthwhile: +@itemize +@cindex @acronym{GLR} with @acronym{LALR} +@item When employing @acronym{GLR} parsers (@pxref{GLR Parsers}), if you +do not resolve any conflicts statically (for example, with @code{%left} +or @code{%prec}), then the parser explores all potential parses of any +given input. +In this case, the use of @acronym{LALR} parser tables is guaranteed not +to alter the language accepted by the parser. +@acronym{LALR} parser tables are the smallest parser tables Bison can +currently generate, so they may be preferable. + +@item Occasionally during development, an especially malformed grammar +with a major recurring flaw may severely impede the @acronym{IELR} or +canonical @acronym{LR} parser table generation algorithm. +@acronym{LALR} can be a quick way to generate parser tables in order to +investigate such problems while ignoring the more subtle differences +from @acronym{IELR} and canonical @acronym{LR}. +@end itemize + +@item @code{ielr}. +@acronym{IELR} is a minimal @acronym{LR} algorithm. +That is, given any grammar (@acronym{LR} or non-@acronym{LR}), +@acronym{IELR} and canonical @acronym{LR} always accept exactly the same +set of sentences. +However, as for @acronym{LALR}, the number of parser states is often an +order of magnitude less for @acronym{IELR} than for canonical +@acronym{LR}. +More importantly, because canonical @acronym{LR}'s extra parser states +may contain duplicate conflicts in the case of non-@acronym{LR} +grammars, the number of conflicts for @acronym{IELR} is often an order +of magnitude less as well. +This can significantly reduce the complexity of developing of a grammar. + +@item @code{canonical-lr}. +@cindex delayed syntax errors +@cindex syntax errors delayed +The only advantage of canonical @acronym{LR} over @acronym{IELR} is +that, for every left context of every canonical @acronym{LR} state, the +set of tokens accepted by that state is the exact set of tokens that is +syntactically acceptable in that left context. +Thus, the only difference in parsing behavior is that the canonical +@acronym{LR} parser can report a syntax error as soon as possible +without performing any unnecessary reductions. +@xref{Decl Summary,,lr.default-reductions}, for further details. +Even when canonical @acronym{LR} behavior is ultimately desired, +@acronym{IELR}'s elimination of duplicate conflicts should still +facilitate the development of a grammar. +@end itemize + +@item Default Value: @code{lalr} +@end itemize + + +@c ================================================== namespace +@item namespace +@findex %define namespace +Obsoleted by @code{api.namespace} +@c namespace + + +@c ================================================== parse.assert +@item parse.assert +@findex %define parse.assert + +@itemize +@item Languages(s): C++ + +@item Purpose: Issue runtime assertions to catch invalid uses. +In C++, when variants are used (@pxref{C++ Variants}), symbols must be +constructed and +destroyed properly. This option checks these constraints. + +@item Accepted Values: Boolean + +@item Default Value: @code{false} +@end itemize +@c parse.assert + + +@c ================================================== parse.error +@item parse.error +@findex %define parse.error +@itemize +@item Languages(s): +all. +@item Purpose: +Control the kind of error messages passed to the error reporting +function. @xref{Error Reporting, ,The Error Reporting Function +@code{yyerror}}. +@item Accepted Values: +@itemize +@item @code{simple} +Error messages passed to @code{yyerror} are simply @w{@code{"syntax +error"}}. +@item @code{verbose} +Error messages report the unexpected token, and possibly the expected +ones. +@end itemize + +@item Default Value: +@code{simple} +@end itemize +@c parse.error + -Some @var{variable}s may be used as boolean values: in this case, the -skeleton will conventionally treat a @var{value} of @samp{false} as the -boolean variable being false; a @var{value} of @samp{true}, or @var{value} -being omitted altogether, will conversely define the variable as true. +@c ================================================== parse.trace +@item parse.trace +@findex %define parse.trace + +@itemize +@item Languages(s): C, C++ + +@item Purpose: Require parser instrumentation for tracing. +In C/C++, define the macro @code{YYDEBUG} to 1 in the parser file if it +is not already defined, so that the debugging facilities are compiled. +@xref{Tracing, ,Tracing Your Parser}. + +@item Accepted Values: Boolean + +@item Default Value: @code{false} +@end itemize +@c parse.trace + +@c ================================================== variant +@item variant +@findex %define variant + +@itemize @bullet +@item Language(s): +C++ + +@item Purpose: +Requests variant-based semantic values. +@xref{C++ Variants}. + +@item Accepted Values: +Boolean. + +@item Default Value: +@code{false} +@end itemize +@c variant + + +@end table @end deffn +@c ---------------------------------------------------------- %define @deffn {Directive} %defines Write a header file containing macro definitions for the token type @@ -4759,8 +5379,11 @@ chosen as if the input file were named @file{@var{prefix}.y}. @deffn {Directive} %language "@var{language}" Specify the programming language for the generated parser. Currently -supported languages include C and C++. +supported languages include C, C++, and Java. @var{language} is case-insensitive. + +This directive is experimental and its effect may be modified in future +releases. @end deffn @deffn {Directive} %locations @@ -4777,10 +5400,13 @@ Rename the external symbols used in the parser so that they start with in C parsers is @code{yyparse}, @code{yylex}, @code{yyerror}, @code{yynerrs}, @code{yylval}, @code{yychar}, @code{yydebug}, and -(if locations are used) @code{yylloc}. For example, if you use -@samp{%name-prefix "c_"}, the names become @code{c_parse}, @code{c_lex}, -and so on. In C++ parsers, it is only the surrounding namespace which is -named @var{prefix} instead of @samp{yy}. +(if locations are used) @code{yylloc}. If you use a push parser, +@code{yypush_parse}, @code{yypull_parse}, @code{yypstate}, +@code{yypstate_new} and @code{yypstate_delete} will +also be renamed. For example, if you use @samp{%name-prefix "c_"}, the +names become @code{c_parse}, @code{c_lex}, and so on. +For C++ parsers, see the @samp{%define api.namespace} documentation in this +section. @xref{Multiple Parsers, ,Multiple Parsers in the Same Program}. @end deffn @@ -4792,16 +5418,6 @@ Precedence}). @end deffn @end ifset -@deffn {Directive} %no-parser -Do not include any C code in the parser file; generate tables only. The -parser file contains just @code{#define} directives and static variable -declarations. - -This option also tells Bison to write the C code for the grammar actions -into a file named @file{@var{file}.act}, in the form of a -brace-surrounded body fit for a @code{switch} statement. -@end deffn - @deffn {Directive} %no-lines Don't generate any @code{#line} preprocessor commands in the parser file. Ordinarily Bison writes these commands in the parser file so that @@ -4816,8 +5432,8 @@ Specify @var{file} for the parser file. @end deffn @deffn {Directive} %pure-parser -Request a pure (reentrant) parser program (@pxref{Pure Decl, ,A Pure -(Reentrant) Parser}). +Deprecated version of @samp{%define api.pure} (@pxref{Decl Summary, ,%define}), +for which Bison is more careful to warn about unreasonable usage. @end deffn @deffn {Directive} %require "@var{version}" @@ -4828,10 +5444,10 @@ Require a Version of Bison}. @deffn {Directive} %skeleton "@var{file}" Specify the skeleton to use. -You probably don't need this option unless you are developing Bison. -You should use @code{%language} if you want to specify the skeleton for a -different language, because it is clearer and because it will always choose the -correct skeleton for non-deterministic or push parsers. +@c You probably don't need this option unless you are developing Bison. +@c You should use @code{%language} if you want to specify the skeleton for a +@c different language, because it is clearer and because it will always choose the +@c correct skeleton for non-deterministic or push parsers. If @var{file} does not contain a @code{/}, @var{file} is the name of a skeleton file in the Bison installation directory. @@ -4903,8 +5519,11 @@ names that do not conflict. The precise list of symbols renamed is @code{yyparse}, @code{yylex}, @code{yyerror}, @code{yynerrs}, @code{yylval}, @code{yylloc}, -@code{yychar} and @code{yydebug}. For example, if you use @samp{-p c}, -the names become @code{cparse}, @code{clex}, and so on. +@code{yychar} and @code{yydebug}. If you use a push parser, +@code{yypush_parse}, @code{yypull_parse}, @code{yypstate}, +@code{yypstate_new} and @code{yypstate_delete} will also be renamed. +For example, if you use @samp{-p c}, the names become @code{cparse}, +@code{clex}, and so on. @strong{All the other variables and macros associated with Bison are not renamed.} These others are not global; there is no conflict if the same @@ -4932,13 +5551,17 @@ identifier (aside from those in this manual) in an action or in epilogue in the grammar file, you are likely to run into trouble. @menu -* Parser Function:: How to call @code{yyparse} and what it returns. -* Lexical:: You must supply a function @code{yylex} - which reads tokens. -* Error Reporting:: You must supply a function @code{yyerror}. -* Action Features:: Special features for use in actions. -* Internationalization:: How to let the parser speak in the user's - native language. +* Parser Function:: How to call @code{yyparse} and what it returns. +* Push Parser Function:: How to call @code{yypush_parse} and what it returns. +* Pull Parser Function:: How to call @code{yypull_parse} and what it returns. +* Parser Create Function:: How to call @code{yypstate_new} and what it returns. +* Parser Delete Function:: How to call @code{yypstate_delete} and what it returns. +* Lexical:: You must supply a function @code{yylex} + which reads tokens. +* Error Reporting:: You must supply a function @code{yyerror}. +* Action Features:: Special features for use in actions. +* Internationalization:: How to let the parser speak in the user's + native language. @end menu @node Parser Function @@ -4980,10 +5603,10 @@ If you use a reentrant parser, you can optionally pass additional parameter information to it in a reentrant way. To do so, use the declaration @code{%parse-param}: -@deffn {Directive} %parse-param @{@var{argument-declaration}@} +@deffn {Directive} %parse-param @{@var{argument-declaration}@} @dots{} @findex %parse-param -Declare that an argument declared by the braced-code -@var{argument-declaration} is an additional @code{yyparse} argument. +Declare that one or more +@var{argument-declaration} are additional @code{yyparse} arguments. The @var{argument-declaration} is used when declaring functions or prototypes. The last identifier in @var{argument-declaration} must be the argument name. @@ -4992,8 +5615,7 @@ functions or prototypes. The last identifier in Here's an example. Write this in the parser: @example -%parse-param @{int *nastiness@} -%parse-param @{int *randomness@} +%parse-param @{int *nastiness@} @{int *randomness@} @end example @noindent @@ -5015,6 +5637,75 @@ In the grammar actions, use expressions like this to refer to the data: exp: @dots{} @{ @dots{}; *randomness += 1; @dots{} @} @end example +@node Push Parser Function +@section The Push Parser Function @code{yypush_parse} +@findex yypush_parse + +(The current push parsing interface is experimental and may evolve. +More user feedback will help to stabilize it.) + +You call the function @code{yypush_parse} to parse a single token. This +function is available if either the @samp{%define api.push-pull push} or +@samp{%define api.push-pull both} declaration is used. +@xref{Push Decl, ,A Push Parser}. + +@deftypefun int yypush_parse (yypstate *yyps) +The value returned by @code{yypush_parse} is the same as for yyparse with the +following exception. @code{yypush_parse} will return YYPUSH_MORE if more input +is required to finish parsing the grammar. +@end deftypefun + +@node Pull Parser Function +@section The Pull Parser Function @code{yypull_parse} +@findex yypull_parse + +(The current push parsing interface is experimental and may evolve. +More user feedback will help to stabilize it.) + +You call the function @code{yypull_parse} to parse the rest of the input +stream. This function is available if the @samp{%define api.push-pull both} +declaration is used. +@xref{Push Decl, ,A Push Parser}. + +@deftypefun int yypull_parse (yypstate *yyps) +The value returned by @code{yypull_parse} is the same as for @code{yyparse}. +@end deftypefun + +@node Parser Create Function +@section The Parser Create Function @code{yystate_new} +@findex yypstate_new + +(The current push parsing interface is experimental and may evolve. +More user feedback will help to stabilize it.) + +You call the function @code{yypstate_new} to create a new parser instance. +This function is available if either the @samp{%define api.push-pull push} or +@samp{%define api.push-pull both} declaration is used. +@xref{Push Decl, ,A Push Parser}. + +@deftypefun yypstate *yypstate_new (void) +The function will return a valid parser instance if there was memory available +or 0 if no memory was available. +In impure mode, it will also return 0 if a parser instance is currently +allocated. +@end deftypefun + +@node Parser Delete Function +@section The Parser Delete Function @code{yystate_delete} +@findex yypstate_delete + +(The current push parsing interface is experimental and may evolve. +More user feedback will help to stabilize it.) + +You call the function @code{yypstate_delete} to delete a parser instance. +function is available if either the @samp{%define api.push-pull push} or +@samp{%define api.push-pull both} declaration is used. +@xref{Push Decl, ,A Push Parser}. + +@deftypefun void yypstate_delete (yypstate *yyps) +This function will reclaim the memory associated with a parser instance. +After this call, you should no longer attempt to use the parser instance. +@end deftypefun @node Lexical @section The Lexical Analyzer Function @code{yylex} @@ -5036,13 +5727,13 @@ that need it. @xref{Invocation, ,Invoking Bison}. @menu * Calling Convention:: How @code{yyparse} calls @code{yylex}. -* Token Values:: How @code{yylex} must return the semantic value - of the token it has read. -* Token Locations:: How @code{yylex} must return the text location - (line number, etc.) of the token, if the - actions want that. -* Pure Calling:: How the calling convention differs - in a pure parser (@pxref{Pure Decl, ,A Pure (Reentrant) Parser}). +* Token Values:: How @code{yylex} must return the semantic value + of the token it has read. +* Token Locations:: How @code{yylex} must return the text location + (line number, etc.) of the token, if the + actions want that. +* Pure Calling:: How the calling convention differs in a pure parser + (@pxref{Pure Decl, ,A Pure (Reentrant) Parser}). @end menu @node Calling Convention @@ -5196,7 +5887,7 @@ The data type of @code{yylloc} has the name @code{YYLTYPE}. @node Pure Calling @subsection Calling Conventions for Pure Parsers -When you use the Bison declaration @code{%pure-parser} to request a +When you use the Bison declaration @samp{%define api.pure} to request a pure, reentrant parser, the global communication variables @code{yylval} and @code{yylloc} cannot be used. (@xref{Pure Decl, ,A Pure (Reentrant) Parser}.) In such parsers the two global variables are replaced by @@ -5220,46 +5911,57 @@ textual locations, then the type @code{YYLTYPE} will not be defined. In this case, omit the second argument; @code{yylex} will be called with only one argument. - -If you wish to pass the additional parameter data to @code{yylex}, use +If you wish to pass additional arguments to @code{yylex}, use @code{%lex-param} just like @code{%parse-param} (@pxref{Parser -Function}). +Function}). To pass additional arguments to both @code{yylex} and +@code{yyparse}, use @code{%param}. -@deffn {Directive} lex-param @{@var{argument-declaration}@} +@deffn {Directive} %lex-param @{@var{argument-declaration}@} @dots{} @findex %lex-param -Declare that the braced-code @var{argument-declaration} is an -additional @code{yylex} argument declaration. +Specify that @var{argument-declaration} are additional @code{yylex} argument +declarations. You may pass one or more such declarations, which is +equivalent to repeating @code{%lex-param}. +@end deffn + +@deffn {Directive} %param @{@var{argument-declaration}@} @dots{} +@findex %param +Specify that @var{argument-declaration} are additional +@code{yylex}/@code{yyparse} argument declaration. This is equivalent to +@samp{%lex-param @{@var{argument-declaration}@} @dots{} %parse-param +@{@var{argument-declaration}@} @dots{}}. You may pass one or more +declarations, which is equivalent to repeating @code{%param}. @end deffn For instance: @example -%parse-param @{int *nastiness@} -%lex-param @{int *nastiness@} -%parse-param @{int *randomness@} +%lex-param @{scanner_mode *mode@} +%parse-param @{parser_mode *mode@} +%param @{environment_type *env@} @end example @noindent results in the following signature: @example -int yylex (int *nastiness); -int yyparse (int *nastiness, int *randomness); +int yylex (scanner_mode *mode, environment_type *env); +int yyparse (parser_mode *mode, environment_type *env); @end example -If @code{%pure-parser} is added: +If @samp{%define api.pure} is added: @example -int yylex (YYSTYPE *lvalp, int *nastiness); -int yyparse (int *nastiness, int *randomness); +int yylex (YYSTYPE *lvalp, scanner_mode *mode, environment_type *env); +int yyparse (parser_mode *mode, environment_type *env); @end example @noindent -and finally, if both @code{%pure-parser} and @code{%locations} are used: +and finally, if both @samp{%define api.pure} and @code{%locations} are used: @example -int yylex (YYSTYPE *lvalp, YYLTYPE *llocp, int *nastiness); -int yyparse (int *nastiness, int *randomness); +int yylex (YYSTYPE *lvalp, YYLTYPE *llocp, + scanner_mode *mode, environment_type *env); +int yyparse (parser_mode *mode, environment_type *env); @end example @node Error Reporting @@ -5269,7 +5971,7 @@ int yyparse (int *nastiness, int *randomness); @cindex parse error @cindex syntax error -The Bison parser detects a @dfn{syntax error} or @dfn{parse error} +The Bison parser detects a @dfn{syntax error} (or @dfn{parse error}) whenever it reads a token which cannot satisfy any syntax rule. An action in the grammar can also explicitly proclaim an error, using the macro @code{YYERROR} (@pxref{Action Features, ,Special Features for Use @@ -5281,8 +5983,8 @@ called by @code{yyparse} whenever a syntax error is found, and it receives one argument. For a syntax error, the string is normally @w{@code{"syntax error"}}. -@findex %error-verbose -If you invoke the directive @code{%error-verbose} in the Bison +@findex %define parse.error +If you invoke @samp{%define parse.error verbose} in the Bison declarations section (@pxref{Bison Declarations, ,The Bison Declarations Section}), then Bison provides a more verbose and specific error message string instead of just plain @w{@code{"syntax error"}}. @@ -5321,7 +6023,7 @@ Obviously, in location tracking pure parsers, @code{yyerror} should have an access to the current location. This is indeed the case for the @acronym{GLR} parsers, but not for the Yacc parser, for historical reasons. I.e., if -@samp{%locations %pure-parser} is passed then the prototypes for +@samp{%locations %define api.pure} is passed then the prototypes for @code{yyerror} are: @example @@ -5339,13 +6041,14 @@ void yyerror (int *nastiness, char const *msg); /* GLR parsers. */ Finally, @acronym{GLR} and Yacc parsers share the same @code{yyerror} calling convention for absolutely pure parsers, i.e., when the calling convention of @code{yylex} @emph{and} the calling convention of -@code{%pure-parser} are pure. I.e.: +@samp{%define api.pure} are pure. +I.e.: @example /* Location tracking. */ %locations /* Pure yylex. */ -%pure-parser +%define api.pure %lex-param @{int *nastiness@} /* Pure yyparse. */ %parse-param @{int *nastiness@} @@ -5684,7 +6387,7 @@ This kind of parser is known in the literature as a bottom-up parser. * Contextual Precedence:: When an operator's precedence depends on context. * Parser States:: The parser is a finite-state-machine with stack. * Reduce/Reduce:: When two rules are applicable in the same situation. -* Mystery Conflicts:: Reduce/reduce conflicts that look unjustified. +* Mystery Conflicts:: Reduce/reduce conflicts that look unjustified. * Generalized LR Parsing:: Parsing arbitrary context-free grammars. * Memory Management:: What happens when memory is exhausted. How to avoid it. @end menu @@ -5856,7 +6559,8 @@ shift and when to reduce. @menu * Why Precedence:: An example showing why precedence is needed. -* Using Precedence:: How to specify precedence in Bison grammars. +* Using Precedence:: How to specify precedence and associativity. +* Precedence Only:: How to specify precedence only. * Precedence Examples:: How these features are used in the previous example. * How Precedence:: How they work. @end menu @@ -5911,8 +6615,9 @@ makes right-associativity. @node Using Precedence @subsection Specifying Operator Precedence @findex %left -@findex %right @findex %nonassoc +@findex %precedence +@findex %right Bison allows you to specify these choices with the operator precedence declarations @code{%left} and @code{%right}. Each such declaration @@ -5922,13 +6627,63 @@ those operators left-associative and the @code{%right} declaration makes them right-associative. A third alternative is @code{%nonassoc}, which declares that it is a syntax error to find the same operator twice ``in a row''. +The last alternative, @code{%precedence}, allows to define only +precedence and no associativity at all. As a result, any +associativity-related conflict that remains will be reported as an +compile-time error. The directive @code{%nonassoc} creates run-time +error: using the operator in a associative way is a syntax error. The +directive @code{%precedence} creates compile-time errors: an operator +@emph{can} be involved in an associativity-related conflict, contrary to +what expected the grammar author. The relative precedence of different operators is controlled by the -order in which they are declared. The first @code{%left} or -@code{%right} declaration in the file declares the operators whose +order in which they are declared. The first precedence/associativity +declaration in the file declares the operators whose precedence is lowest, the next such declaration declares the operators whose precedence is a little higher, and so on. +@node Precedence Only +@subsection Specifying Precedence Only +@findex %precedence + +Since @acronym{POSIX} Yacc defines only @code{%left}, @code{%right}, and +@code{%nonassoc}, which all defines precedence and associativity, little +attention is paid to the fact that precedence cannot be defined without +defining associativity. Yet, sometimes, when trying to solve a +conflict, precedence suffices. In such a case, using @code{%left}, +@code{%right}, or @code{%nonassoc} might hide future (associativity +related) conflicts that would remain hidden. + +The dangling @code{else} ambiguity (@pxref{Shift/Reduce, , Shift/Reduce +Conflicts}) can be solved explicitly. This shift/reduce conflicts occurs +in the following situation, where the period denotes the current parsing +state: + +@example +if @var{e1} then if @var{e2} then @var{s1} . else @var{s2} +@end example + +The conflict involves the reduction of the rule @samp{IF expr THEN +stmt}, which precedence is by default that of its last token +(@code{THEN}), and the shifting of the token @code{ELSE}. The usual +disambiguation (attach the @code{else} to the closest @code{if}), +shifting must be preferred, i.e., the precedence of @code{ELSE} must be +higher than that of @code{THEN}. But neither is expected to be involved +in an associativity related conflict, which can be specified as follows. + +@example +%precedence THEN +%precedence ELSE +@end example + +The unary-minus is another typical example where associativity is +usually over-specified, see @ref{Infix Calc, , Infix Notation +Calculator: @code{calc}}. The @code{%left} directive is traditionally +used to declare the precedence of @code{NEG}, which is more than needed +since it also defines its associativity. While this is harmless in the +traditional example, who knows how @code{NEG} might be used in future +evolutions of the grammar@dots{} + @node Precedence Examples @subsection Precedence Examples @@ -5990,8 +6745,8 @@ outlandish at first, but it is really very common. For example, a minus sign typically has a very high precedence as a unary operator, and a somewhat lower precedence (lower than multiplication) as a binary operator. -The Bison precedence declarations, @code{%left}, @code{%right} and -@code{%nonassoc}, can only be used once for a given token; so a token has +The Bison precedence declarations +can only be used once for a given token; so a token has only one precedence declared in this way. For context-dependent precedence, you need to use an additional mechanism: the @code{%prec} modifier for rules. @@ -6243,12 +6998,13 @@ a @code{name} if a comma or colon follows, or a @code{type} if another @cindex @acronym{LR}(1) @cindex @acronym{LALR}(1) -However, Bison, like most parser generators, cannot actually handle all -@acronym{LR}(1) grammars. In this grammar, two contexts, that after -an @code{ID} -at the beginning of a @code{param_spec} and likewise at the beginning of -a @code{return_spec}, are similar enough that Bison assumes they are the -same. They appear similar because the same set of rules would be +However, for historical reasons, Bison cannot by default handle all +@acronym{LR}(1) grammars. +In this grammar, two contexts, that after an @code{ID} at the beginning +of a @code{param_spec} and likewise at the beginning of a +@code{return_spec}, are similar enough that Bison assumes they are the +same. +They appear similar because the same set of rules would be active---the rule for reducing to a @code{name} and that for reducing to a @code{type}. Bison is unable to determine at that stage of processing that the rules would require different lookahead tokens in the two @@ -6256,16 +7012,22 @@ contexts, so it makes a single parser state for them both. Combining the two contexts causes a conflict later. In parser terminology, this occurrence means that the grammar is not @acronym{LALR}(1). -In general, it is better to fix deficiencies than to document them. But -this particular deficiency is intrinsically hard to fix; parser -generators that can handle @acronym{LR}(1) grammars are hard to write -and tend to -produce parsers that are very large. In practice, Bison is more useful -as it is now. - -When the problem arises, you can often fix it by identifying the two -parser states that are being confused, and adding something to make them -look distinct. In the above example, adding one rule to +For many practical grammars (specifically those that fall into the +non-@acronym{LR}(1) class), the limitations of @acronym{LALR}(1) result in +difficulties beyond just mysterious reduce/reduce conflicts. +The best way to fix all these problems is to select a different parser +table generation algorithm. +Either @acronym{IELR}(1) or canonical @acronym{LR}(1) would suffice, but +the former is more efficient and easier to debug during development. +@xref{Decl Summary,,lr.type}, for details. +(Bison's @acronym{IELR}(1) and canonical @acronym{LR}(1) implementations +are experimental. +More user feedback will help to stabilize them.) + +If you instead wish to work around @acronym{LALR}(1)'s limitations, you +can often fix a mysterious conflict by identifying the two parser states +that are being confused, and adding something to make them look +distinct. In the above example, adding one rule to @code{return_spec} as follows makes the problem go away: @example @@ -6333,7 +7095,7 @@ The same is true of languages that require more than one symbol of lookahead, since the parser lacks the information necessary to make a decision at the point it must be made in a shift-reduce parser. Finally, as previously mentioned (@pxref{Mystery Conflicts}), -there are languages where Bison's particular choice of how to +there are languages where Bison's default choice of how to summarize the input seen so far loses necessary information. When you use the @samp{%glr-parser} declaration in your grammar file, @@ -6365,7 +7127,7 @@ grammar symbol that produces the same segment of the input token stream. Whenever the parser makes a transition from having multiple -states to having one, it reverts to the normal @acronym{LALR}(1) parsing +states to having one, it reverts to the normal deterministic parsing algorithm, after resolving and executing the saved-up actions. At this transition, some of the states on the stack will have semantic values that are sets (actually multisets) of possible actions. The @@ -6378,9 +7140,9 @@ Bison resolves and evaluates both and then calls the merge function on the result. Otherwise, it reports an ambiguity. It is possible to use a data structure for the @acronym{GLR} parsing tree that -permits the processing of any @acronym{LALR}(1) grammar in linear time (in the +permits the processing of any @acronym{LR}(1) grammar in linear time (in the size of the input), any unambiguous (not necessarily -@acronym{LALR}(1)) grammar in +@acronym{LR}(1)) grammar in quadratic worst-case time, and any general (possibly ambiguous) context-free grammar in cubic worst-case time. However, Bison currently uses a simpler data structure that requires time proportional to the @@ -6390,9 +7152,9 @@ grammars can require exponential time and space to process. Such badly behaving examples, however, are not generally of practical interest. Usually, nondeterminism in a grammar is local---the parser is ``in doubt'' only for a few tokens at a time. Therefore, the current data -structure should generally be adequate. On @acronym{LALR}(1) portions of a -grammar, in particular, it is only slightly slower than with the default -Bison parser. +structure should generally be adequate. On @acronym{LR}(1) portions of a +grammar, in particular, it is only slightly slower than with the +deterministic @acronym{LR}(1) Bison parser. For a more detailed exposition of @acronym{GLR} parsers, please see: Elizabeth Scott, Adrian Johnstone and Shamsa Sadaf Hussain, Tomita-Style @@ -6441,16 +7203,16 @@ The default value of @code{YYMAXDEPTH}, if you do not define it, is @vindex YYINITDEPTH You can control how much stack is allocated initially by defining the -macro @code{YYINITDEPTH} to a positive integer. For the C -@acronym{LALR}(1) parser, this value must be a compile-time constant +macro @code{YYINITDEPTH} to a positive integer. For the deterministic +parser in C, this value must be a compile-time constant unless you are assuming C99 or some other target language or compiler that allows variable-length arrays. The default is 200. Do not allow @code{YYINITDEPTH} to be greater than @code{YYMAXDEPTH}. @c FIXME: C++ output. -Because of semantical differences between C and C++, the -@acronym{LALR}(1) parsers in C produced by Bison cannot grow when compiled +Because of semantic differences between C and C++, the deterministic +parsers in C produced by Bison cannot grow when compiled by C++ compilers. In this precise case (compiling a C parser as C++) you are suggested to grow @code{YYINITDEPTH}. The Bison maintainers hope to fix this deficiency in a future release. @@ -6838,9 +7600,10 @@ useless: STR; @command{bison} reports: @example -calc.y: warning: 1 useless nonterminal and 1 useless rule -calc.y:11.1-7: warning: useless nonterminal: useless -calc.y:11.10-12: warning: useless rule: useless: STR +calc.y: warning: 1 nonterminal useless in grammar +calc.y: warning: 1 rule useless in grammar +calc.y:11.1-7: warning: nonterminal useless in grammar: useless +calc.y:11.10-12: warning: rule useless in grammar: useless: STR calc.y: conflicts: 7 shift/reduce @end example @@ -6879,17 +7642,17 @@ State 11 conflicts: 4 shift/reduce The next section reports useless tokens, nonterminal and rules. Useless nonterminals and rules are removed in order to produce a smaller parser, but useless tokens are preserved, since they might be used by the -scanner (note the difference between ``useless'' and ``not used'' +scanner (note the difference between ``useless'' and ``unused'' below): @example -Useless nonterminals: +Nonterminals useless in grammar: useless -Terminals which are not used: +Terminals unused in grammar: STR -Useless rules: +Rules useless in grammar: #6 useless: STR; @end example @@ -7026,6 +7789,7 @@ control will jump to state 4, corresponding to the item @samp{exp -> exp '+' . exp}. Since there is no default action, any other token than those listed above will trigger a syntax error. +@cindex accepting state The state 3 is named the @dfn{final state}, or the @dfn{accepting state}: @@ -7106,7 +7870,7 @@ sentence @samp{NUM + NUM / NUM} can be parsed as @samp{NUM + (NUM / NUM)}, which corresponds to shifting @samp{/}, or as @samp{(NUM + NUM) / NUM}, which corresponds to reducing rule 1. -Because in @acronym{LALR}(1) parsing a single decision can be made, Bison +Because in deterministic parsing a single decision can be made, Bison arbitrarily chose to disable the reduction, see @ref{Shift/Reduce, , Shift/Reduce Conflicts}. Discarded actions are reported in between square brackets. @@ -7127,7 +7891,7 @@ with some set of possible lookahead tokens. When run with @example state 8 - exp -> exp . '+' exp [$, '+', '-', '/'] (rule 1) + exp -> exp . '+' exp (rule 1) exp -> exp '+' exp . [$, '+', '-', '/'] (rule 1) exp -> exp . '-' exp (rule 2) exp -> exp . '*' exp (rule 3) @@ -7223,15 +7987,21 @@ Use the @samp{-t} option when you run Bison (@pxref{Invocation, @item the directive @samp{%debug} @findex %debug -Add the @code{%debug} directive (@pxref{Decl Summary, ,Bison -Declaration Summary}). This is a Bison extension, which will prove -useful when Bison will output parsers for languages that don't use a -preprocessor. Unless @acronym{POSIX} and Yacc portability matter to -you, this is -the preferred solution. +Add the @code{%debug} directive (@pxref{Decl Summary, ,Bison Declaration +Summary}). This Bison extension is maintained for backward +compatibility with previous versions of Bison. + +@item the variable @samp{parse.trace} +@findex %define parse.trace +Add the @samp{%define parse.trace} directive (@pxref{Decl Summary, +,Bison Declaration Summary}), or pass the @option{-Dparse.trace} option +(@pxref{Bison Options}). This is a Bison extension, which is especially +useful for languages that don't use a preprocessor. Unless +@acronym{POSIX} and Yacc portability matter to you, this is the +preferred solution. @end table -We suggest that you always enable the debug option so that debugging is +We suggest that you always enable the trace option so that debugging is always possible. The trace facility outputs messages with macro calls of the form @@ -7288,7 +8058,7 @@ standard I/O stream, the numeric code for the token type, and the token value (from @code{yylval}). Here is an example of @code{YYPRINT} suitable for the multi-function -calculator (@pxref{Mfcalc Decl, ,Declarations for @code{mfcalc}}): +calculator (@pxref{Mfcalc Declarations, ,Declarations for @code{mfcalc}}): @smallexample %@{ @@ -7389,6 +8159,9 @@ Print the version number of Bison and exit. @item --print-localedir Print the name of the directory containing locale-dependent data. +@item --print-datadir +Print the name of the directory containing skeletons and XSLT. + @item -y @itemx --yacc Act more like the traditional Yacc command. This can cause @@ -7397,7 +8170,7 @@ other minor ways. Most importantly, imitate Yacc's output file name conventions, so that the parser output file is called @file{y.tab.c}, and the other outputs are called @file{y.output} and @file{y.tab.h}. -Also, if generating an @acronym{LALR}(1) parser in C, generate @code{#define} +Also, if generating a deterministic parser in C, generate @code{#define} statements in addition to an @code{enum} to associate token numbers with token names. Thus, the following shell script can substitute for Yacc, and the Bison @@ -7413,6 +8186,46 @@ traditional Yacc grammars. If your grammar uses a Bison extension like @samp{%glr-parser}, Bison might not be Yacc-compatible even if this option is specified. +@item -W [@var{category}] +@itemx --warnings[=@var{category}] +Output warnings falling in @var{category}. @var{category} can be one +of: +@table @code +@item midrule-values +Warn about mid-rule values that are set but not used within any of the actions +of the parent rule. +For example, warn about unused @code{$2} in: + +@example +exp: '1' @{ $$ = 1; @} '+' exp @{ $$ = $1 + $4; @}; +@end example + +Also warn about mid-rule values that are used but not set. +For example, warn about unset @code{$$} in the mid-rule action in: + +@example + exp: '1' @{ $1 = 1; @} '+' exp @{ $$ = $2 + $4; @}; +@end example + +These warnings are not enabled by default since they sometimes prove to +be false alarms in existing grammars employing the Yacc constructs +@code{$0} or @code{$-@var{n}} (where @var{n} is some positive integer). + + +@item yacc +Incompatibilities with @acronym{POSIX} Yacc. + +@item all +All the warnings. +@item none +Turn off all the warnings. +@item error +Treat warnings as errors. +@end table + +A category can be turned off by prefixing its name with @samp{no-}. For +instance, @option{-Wno-syntax} will hide the warnings about unused +variables. @end table @noindent @@ -7425,13 +8238,45 @@ In the parser file, define the macro @code{YYDEBUG} to 1 if it is not already defined, so that the debugging facilities are compiled. @xref{Tracing, ,Tracing Your Parser}. +@item -D @var{name}[=@var{value}] +@itemx --define=@var{name}[=@var{value}] +@itemx -F @var{name}[=@var{value}] +@itemx --force-define=@var{name}[=@var{value}] +Each of these is equivalent to @samp{%define @var{name} "@var{value}"} +(@pxref{Decl Summary, ,%define}) except that Bison processes multiple +definitions for the same @var{name} as follows: + +@itemize +@item +Bison quietly ignores all command-line definitions for @var{name} except +the last. +@item +If that command-line definition is specified by a @code{-D} or +@code{--define}, Bison reports an error for any @code{%define} +definition for @var{name}. +@item +If that command-line definition is specified by a @code{-F} or +@code{--force-define} instead, Bison quietly ignores all @code{%define} +definitions for @var{name}. +@item +Otherwise, Bison reports an error if there are multiple @code{%define} +definitions for @var{name}. +@end itemize + +You should avoid using @code{-F} and @code{--force-define} in your +makefiles unless you are confident that it is safe to quietly ignore any +conflicting @code{%define} that may be added to the grammar file. + @item -L @var{language} @itemx --language=@var{language} Specify the programming language for the generated parser, as if @code{%language} was specified (@pxref{Decl Summary, , Bison Declaration -Summary}). Currently supported languages include C and C++. +Summary}). Currently supported languages include C, C++, and Java. @var{language} is case-insensitive. +This option is experimental and its effect may be modified in future +releases. + @item --locations Pretend that @code{%locations} was specified. @xref{Decl Summary}. @@ -7448,19 +8293,15 @@ and debuggers will associate errors with your source file, the grammar file. This option causes them to associate errors with the parser file, treating it as an independent source file in its own right. -@item -n -@itemx --no-parser -Pretend that @code{%no-parser} was specified. @xref{Decl Summary}. - @item -S @var{file} @itemx --skeleton=@var{file} Specify the skeleton to use, similar to @code{%skeleton} (@pxref{Decl Summary, , Bison Declaration Summary}). -You probably don't need this option unless you are developing Bison. -You should use @option{--language} if you want to specify the skeleton for a -different language, because it is clearer and because it will always -choose the correct skeleton for non-deterministic or push parsers. +@c You probably don't need this option unless you are developing Bison. +@c You should use @option{--language} if you want to specify the skeleton for a +@c different language, because it is clearer and because it will always +@c choose the correct skeleton for non-deterministic or push parsers. If @var{file} does not contain a @code{/}, @var{file} is the name of a skeleton file in the Bison installation directory. @@ -7477,14 +8318,15 @@ Pretend that @code{%token-table} was specified. @xref{Decl Summary}. Adjust the output: @table @option -@item -d -@itemx --defines +@item --defines[=@var{file}] Pretend that @code{%defines} was specified, i.e., write an extra output file containing macro definitions for the token type names defined in the grammar, as well as a few other declarations. @xref{Decl Summary}. -@item --defines=@var{defines-file} -Same as above, but save in the file @var{defines-file}. +@item -d +This is the same as @code{--defines} except @code{-d} does not accept a +@var{file} argument since POSIX Yacc requires that @code{-d} can be bundled +with other short options. @item -b @var{file-prefix} @itemx --file-prefix=@var{prefix} @@ -7499,7 +8341,7 @@ separated list of @var{things} among: @table @code @item state Description of the grammar, conflicts (resolved and unresolved), and -@acronym{LALR} automaton. +parser's automaton. @item lookahead Implies @code{state} and augments the description of the automaton with @@ -7510,6 +8352,9 @@ Implies @code{state} and augments the description of the automaton with the full set of items for each state, instead of its core only. @end table +@item --report-file=@var{file} +Specify the @var{file} for the verbose description. + @item -v @itemx --verbose Pretend that @code{%verbose} was specified, i.e., write an extra output @@ -7523,42 +8368,34 @@ Specify the @var{file} for the parser file. The other output files' names are constructed from @var{file} as described under the @samp{-v} and @samp{-d} options. -@item -g -Output a graphical representation of the @acronym{LALR}(1) grammar +@item -g [@var{file}] +@itemx --graph[=@var{file}] +Output a graphical representation of the parser's automaton computed by Bison, in @uref{http://www.graphviz.org/, Graphviz} @uref{http://www.graphviz.org/doc/info/lang.html, @acronym{DOT}} format. -If the grammar file is @file{foo.y}, the output file will -be @file{foo.dot}. - -@item --graph=@var{graph-file} -The behavior of @var{--graph} is the same than @samp{-g}. The only -difference is that it has an optional argument which is the name of -the output graph file. +@code{@var{file}} is optional. +If omitted and the grammar file is @file{foo.y}, the output file will be +@file{foo.dot}. + +@item -x [@var{file}] +@itemx --xml[=@var{file}] +Output an XML report of the parser's automaton computed by Bison. +@code{@var{file}} is optional. +If omitted and the grammar file is @file{foo.y}, the output file will be +@file{foo.xml}. +(The current XML schema is experimental and may evolve. +More user feedback will help to stabilize it.) @end table @node Option Cross Key @section Option Cross Key -@c FIXME: How about putting the directives too? Here is a list of options, alphabetized by long option, to help you find -the corresponding short option. - -@multitable {@option{--defines=@var{defines-file}}} {@option{-b @var{file-prefix}XXX}} -@headitem Long Option @tab Short Option -@item @option{--debug} @tab @option{-t} -@item @option{--defines=@var{defines-file}} @tab @option{-d} -@item @option{--file-prefix=@var{prefix}} @tab @option{-b @var{file-prefix}} -@item @option{--graph=@var{graph-file}} @tab @option{-d} -@item @option{--help} @tab @option{-h} -@item @option{--name-prefix=@var{prefix}} @tab @option{-p @var{name-prefix}} -@item @option{--no-lines} @tab @option{-l} -@item @option{--no-parser} @tab @option{-n} -@item @option{--output=@var{outfile}} @tab @option{-o @var{outfile}} -@item @option{--print-localedir} @tab -@item @option{--token-table} @tab @option{-k} -@item @option{--verbose} @tab @option{-v} -@item @option{--version} @tab @option{-V} -@item @option{--yacc} @tab @option{-y} +the corresponding short option and directive. + +@multitable {@option{--force-define=@var{name}[=@var{value}]}} {@option{-F @var{name}[=@var{value}]}} {@code{%nondeterministic-parser}} +@headitem Long Option @tab Short Option @tab Bison Directive +@include cross-options.texi @end multitable @node Yacc Library @@ -7611,25 +8448,28 @@ int yyparse (void); @node C++ Bison Interface @subsection C++ Bison Interface -@c - %language "C++" +@c - %skeleton "lalr1.cc" @c - Always pure @c - initial action -The C++ @acronym{LALR}(1) parser is selected using the language directive, -@samp{%language "C++"}, or the synonymous command-line option -@option{--language=c++}. +The C++ deterministic parser is selected using the skeleton directive, +@samp{%skeleton "lalr1.c"}, or the synonymous command-line option +@option{--skeleton=lalr1.c}. @xref{Decl Summary}. -When run, @command{bison} will create several -entities in the @samp{yy} namespace. Use the @samp{%name-prefix} -directive to change the namespace name, see @ref{Decl Summary}. The -various classes are generated in the following files: +When run, @command{bison} will create several entities in the @samp{yy} +namespace. +@findex %define api.namespace +Use the @samp{%define api.namespace} directive to change the namespace +name, see +@ref{Decl Summary}. +The various classes are generated in the following files: @table @file @item position.hh @itemx location.hh The definition of the classes @code{position} and @code{location}, -used for location tracking. @xref{C++ Location Values}. +used for location tracking when enabled. @xref{C++ Location Values}. @item stack.hh An auxiliary class @code{stack} used by the parser. @@ -7655,11 +8495,22 @@ for a complete and accurate documentation. @c - YYSTYPE @c - Printer and destructor +Bison supports two different means to handle semantic values in C++. One is +alike the C interface, and relies on unions (@pxref{C++ Unions}). As C++ +practitioners know, unions are inconvenient in C++, therefore another +approach is provided, based on variants (@pxref{C++ Variants}). + +@menu +* C++ Unions:: Semantic values cannot be objects +* C++ Variants:: Using objects as semantic values +@end menu + +@node C++ Unions +@subsubsection C++ Unions + The @code{%union} directive works as for C, see @ref{Union Decl, ,The Collection of Value Types}. In particular it produces a genuine -@code{union}@footnote{In the future techniques to allow complex types -within pseudo-unions (similar to Boost variants) might be implemented to -alleviate these issues.}, which have a few specific features in C++. +@code{union}, which have a few specific features in C++. @itemize @minus @item The type @code{YYSTYPE} is defined but its use is discouraged: rather @@ -7676,6 +8527,98 @@ reclaimed automatically: using the @code{%destructor} directive is the only means to avoid leaks. @xref{Destructor Decl, , Freeing Discarded Symbols}. +@node C++ Variants +@subsubsection C++ Variants + +Starting with version 2.6, Bison provides a @emph{variant} based +implementation of semantic values for C++. This alleviates all the +limitations reported in the previous section, and in particular, object +types can be used without pointers. + +To enable variant-based semantic values, set @code{%define} variable +@code{variant} (@pxref{Decl Summary, , variant}). Once this defined, +@code{%union} is ignored, and instead of using the name of the fields of the +@code{%union} to ``type'' the symbols, use genuine types. + +For instance, instead of + +@example +%union +@{ + int ival; + std::string* sval; +@} +%token NUMBER; +%token STRING; +@end example + +@noindent +write + +@example +%token NUMBER; +%token STRING; +@end example + +@code{STRING} is no longer a pointer, which should fairly simplify the user +actions in the grammar and in the scanner (in particular the memory +management). + +Since C++ features destructors, and since it is customary to specialize +@code{operator<<} to support uniform printing of values, variants also +typically simplify Bison printers and destructors. + +Variants are stricter than unions. When based on unions, you may play any +dirty game with @code{yylval}, say storing an @code{int}, reading a +@code{char*}, and then storing a @code{double} in it. This is no longer +possible with variants: they must be initialized, then assigned to, and +eventually, destroyed. + +@deftypemethod {semantic_type} {T&} build () +Initialize, but leave empty. Returns the address where the actual value may +be stored. Requires that the variant was not initialized yet. +@end deftypemethod + +@deftypemethod {semantic_type} {T&} build (const T& @var{t}) +Initialize, and copy-construct from @var{t}. +@end deftypemethod + + +@strong{Warning}: We do not use Boost.Variant, for two reasons. First, it +appeared unacceptable to require Boost on the user's machine (i.e., the +machine on which the generated parser will be compiled, not the machine on +which @command{bison} was run). Second, for each possible semantic value, +Boost.Variant not only stores the value, but also a tag specifying its +type. But the parser already ``knows'' the type of the semantic value, so +that would be duplicating the information. + +Therefore we developed light-weight variants whose type tag is external (so +they are really like @code{unions} for C++ actually). But our code is much +less mature that Boost.Variant. So there is a number of limitations in +(the current implementation of) variants: +@itemize +@item +Alignment must be enforced: values should be aligned in memory according to +the most demanding type. Computing the smallest alignment possible requires +meta-programming techniques that are not currently implemented in Bison, and +therefore, since, as far as we know, @code{double} is the most demanding +type on all platforms, alignments are enforced for @code{double} whatever +types are actually used. This may waste space in some cases. + +@item +Our implementation is not conforming with strict aliasing rules. Alias +analysis is a technique used in optimizing compilers to detect when two +pointers are disjoint (they cannot ``meet''). Our implementation breaks +some of the rules that G++ 4.4 uses in its alias analysis, so @emph{strict +alias analysis must be disabled}. Use the option +@option{-fno-strict-aliasing} to compile the generated parser. + +@item +There might be portability issues we are not aware of. +@end itemize + +As far as we know, these limitations @emph{can} be alleviated. All it takes +is some time and/or some talented C++ hacker willing to contribute to Bison. @node C++ Location Values @subsection C++ Location Values @@ -7764,9 +8707,19 @@ this class is detailed below. It can be extended using the it describes an additional member of the parser class, and an additional argument for its constructor. -@defcv {Type} {parser} {semantic_value_type} -@defcvx {Type} {parser} {location_value_type} -The types for semantics value and locations. +@defcv {Type} {parser} {semantic_type} +@defcvx {Type} {parser} {location_type} +The types for semantic values and locations (if enabled). +@end defcv + +@defcv {Type} {parser} {syntax_error} +This class derives from @code{std::runtime_error}. Throw instances of it +from user actions to raise parse errors. This is equivalent with first +invoking @code{error} to report the location and message of the syntax +error, and then to invoke @code{YYERROR} to enter the error-recovery mode. +But contrary to @code{YYERROR} which can only be invoked from user actions +(i.e., written in the action itself), the exception can be thrown from +function invoked from the user action. @end defcv @deftypemethod {parser} {} parser (@var{type1} @var{arg1}, ...) @@ -7774,6 +8727,11 @@ Build a new parser object. There are no arguments by default, unless @samp{%parse-param @{@var{type1} @var{arg1}@}} was used. @end deftypemethod +@deftypemethod {syntax_error} {} syntax_error (const location_type& @var{l}, const std::string& @var{m}) +@deftypemethodx {syntax_error} {} syntax_error (const std::string& @var{m}) +Instantiate a syntax-error exception. +@end deftypemethod + @deftypemethod {parser} {int} parse () Run the syntactic analysis, and return 0 on success, 1 otherwise. @end deftypemethod @@ -7791,9 +8749,11 @@ or nonzero, full tracing. @end deftypemethod @deftypemethod {parser} {void} error (const location_type& @var{l}, const std::string& @var{m}) +@deftypemethodx {parser} {void} error (const std::string& @var{m}) The definition for this member function must be supplied by the user: the parser uses it to report a parser error occurring at @var{l}, -described by @var{m}. +described by @var{m}. If location tracking is not enabled, the second +signature is used. @end deftypemethod @@ -7805,25 +8765,143 @@ described by @var{m}. The parser invokes the scanner by calling @code{yylex}. Contrary to C parsers, C++ parsers are always pure: there is no point in using the -@code{%pure-parser} directive. Therefore the interface is as follows. +@samp{%define api.pure} directive. The actual interface with @code{yylex} +depends whether you use unions, or variants. -@deftypemethod {parser} {int} yylex (semantic_value_type& @var{yylval}, location_type& @var{yylloc}, @var{type1} @var{arg1}, ...) -Return the next token. Its type is the return value, its semantic -value and location being @var{yylval} and @var{yylloc}. Invocations of +@menu +* Split Symbols:: Passing symbols as two/three components +* Complete Symbols:: Making symbols a whole +@end menu + +@node Split Symbols +@subsubsection Split Symbols + +Therefore the interface is as follows. + +@deftypemethod {parser} {int} yylex (semantic_type& @var{yylval}, location_type& @var{yylloc}, @var{type1} @var{arg1}, ...) +@deftypemethodx {parser} {int} yylex (semantic_type& @var{yylval}, @var{type1} @var{arg1}, ...) +Return the next token. Its type is the return value, its semantic value and +location (if enabled) being @var{yylval} and @var{yylloc}. Invocations of @samp{%lex-param @{@var{type1} @var{arg1}@}} yield additional arguments. @end deftypemethod +Note that when using variants, the interface for @code{yylex} is the same, +but @code{yylval} is handled differently. + +Regular union-based code in Lex scanner typically look like: + +@example +[0-9]+ @{ + yylval.ival = text_to_int (yytext); + return yy::parser::INTEGER; + @} +[a-z]+ @{ + yylval.sval = new std::string (yytext); + return yy::parser::IDENTIFIER; + @} +@end example + +Using variants, @code{yylval} is already constructed, but it is not +initialized. So the code would look like: + +@example +[0-9]+ @{ + yylval.build() = text_to_int (yytext); + return yy::parser::INTEGER; + @} +[a-z]+ @{ + yylval.build = yytext; + return yy::parser::IDENTIFIER; + @} +@end example + +@noindent +or + +@example +[0-9]+ @{ + yylval.build(text_to_int (yytext)); + return yy::parser::INTEGER; + @} +[a-z]+ @{ + yylval.build(yytext); + return yy::parser::IDENTIFIER; + @} +@end example + + +@node Complete Symbols +@subsubsection Complete Symbols + +If you specified both @code{%define variant} and @code{%define lex_symbol}, +the @code{parser} class also defines the class @code{parser::symbol_type} +which defines a @emph{complete} symbol, aggregating its type (i.e., the +traditional value returned by @code{yylex}), its semantic value (i.e., the +value passed in @code{yylval}, and possibly its location (@code{yylloc}). + +@deftypemethod {symbol_type} {} symbol_type (token_type @var{type}, const semantic_type& @var{value}, const location_type& @var{location}) +Build a complete terminal symbol which token type is @var{type}, and which +semantic value is @var{value}. If location tracking is enabled, also pass +the @var{location}. +@end deftypemethod + +This interface is low-level and should not be used for two reasons. First, +it is inconvenient, as you still have to build the semantic value, which is +a variant, and second, because consistency is not enforced: as with unions, +it is still possible to give an integer as semantic value for a string. + +So for each token type, Bison generates named constructors as follows. + +@deftypemethod {symbol_type} {} make_@var{token} (const @var{value_type}& @var{value}, const location_type& @var{location}) +@deftypemethodx {symbol_type} {} make_@var{token} (const location_type& @var{location}) +Build a complete terminal symbol for the token type @var{token} (not +including the @code{api.tokens.prefix}) whose possible semantic value is +@var{value} of adequate @var{value_type}. If location tracking is enabled, +also pass the @var{location}. +@end deftypemethod + +For instance, given the following declarations: + +@example +%define api.tokens.prefix "TOK_" +%token IDENTIFIER; +%token INTEGER; +%token COLON; +@end example + +@noindent +Bison generates the following functions: + +@example +symbol_type make_IDENTIFIER(const std::string& v, + const location_type& l); +symbol_type make_INTEGER(const int& v, + const location_type& loc); +symbol_type make_COLON(const location_type& loc); +@end example + +@noindent +which should be used in a Lex-scanner as follows. + +@example +[0-9]+ return yy::parser::make_INTEGER(text_to_int (yytext), loc); +[a-z]+ return yy::parser::make_IDENTIFIER(yytext, loc); +":" return yy::parser::make_COLON(loc); +@end example + +Tokens that do not have an identifier are not accessible: you cannot simply +use characters such as @code{':'}, they must be declared with @code{%token}. @node A Complete C++ Example @subsection A Complete C++ Example This section demonstrates the use of a C++ parser with a simple but complete example. This example should be available on your system, -ready to compile, in the directory @dfn{../bison/examples/calc++}. It +ready to compile, in the directory @dfn{.../bison/examples/calc++}. It focuses on the use of Bison, therefore the design of the various C++ classes is very naive: no accessors, no encapsulation of members etc. We will use a Lex scanner, and more precisely, a Flex scanner, to -demonstrate the various interaction. A hand written scanner is +demonstrate the various interactions. A hand-written scanner is actually easier to interface with. @menu @@ -7887,11 +8965,8 @@ factor both as follows. @comment file: calc++-driver.hh @example // Tell Flex the lexer's prototype ... -# define YY_DECL \ - yy::calcxx_parser::token_type \ - yylex (yy::calcxx_parser::semantic_type* yylval, \ - yy::calcxx_parser::location_type* yylloc, \ - calcxx_driver& driver) +# define YY_DECL \ + yy::calcxx_parser::symbol_type yylex (calcxx_driver& driver) // ... and declare it for the parser's sake. YY_DECL; @end example @@ -7915,8 +8990,8 @@ public: @end example @noindent -To encapsulate the coordination with the Flex scanner, it is useful to -have two members function to open and close the scanning phase. +To encapsulate the coordination with the Flex scanner, it is useful to have +member functions to open and close the scanning phase. @comment file: calc++-driver.hh @example @@ -7931,9 +9006,13 @@ Similarly for the parser itself. @comment file: calc++-driver.hh @example - // Run the parser. Return 0 on success. + // Run the parser on file F. + // Return 0 on success. int parse (const std::string& f); + // The name of the file being parsed. + // Used later to pass the file name to the location tracker. std::string file; + // Whether parser traces should be generated. bool trace_parsing; @end example @@ -8002,32 +9081,48 @@ calcxx_driver::error (const std::string& m) @subsubsection Calc++ Parser The parser definition file @file{calc++-parser.yy} starts by asking for -the C++ LALR(1) skeleton, the creation of the parser header file, and -specifies the name of the parser class. Because the C++ skeleton -changed several times, it is safer to require the version you designed -the grammar for. +the C++ deterministic parser skeleton, the creation of the parser header +file, and specifies the name of the parser class. +Because the C++ skeleton changed several times, it is safer to require +the version you designed the grammar for. @comment file: calc++-parser.yy @example -%language "C++" /* -*- C++ -*- */ +%skeleton "lalr1.cc" /* -*- C++ -*- */ %require "@value{VERSION}" %defines %define parser_class_name "calcxx_parser" @end example +@noindent +@findex %define variant +@findex %define lex_symbol +This example will use genuine C++ objects as semantic values, therefore, we +require the variant-based interface. To make sure we properly use it, we +enable assertions. To fully benefit from type-safety and more natural +definition of ``symbol'', we enable @code{lex_symbol}. + +@comment file: calc++-parser.yy +@example +%define variant +%define parse.assert +%define lex_symbol +@end example + @noindent @findex %code requires -Then come the declarations/inclusions needed to define the -@code{%union}. Because the parser uses the parsing driver and -reciprocally, both cannot include the header of the other. Because the +Then come the declarations/inclusions needed by the semantic values. +Because the parser uses the parsing driver and reciprocally, both would like +to include the header of the other, which is, of course, insane. This +mutual dependency will be broken using forward declarations. Because the driver's header needs detailed knowledge about the parser class (in -particular its inner types), it is the parser's header which will simply -use a forward declaration of the driver. -@xref{Decl Summary, ,%code}. +particular its inner types), it is the parser's header which will use a +forward declaration of the driver. @xref{Decl Summary, ,%code}. @comment file: calc++-parser.yy @example -%code requires @{ +%code requires +@{ # include class calcxx_driver; @} @@ -8041,15 +9136,14 @@ global variables. @comment file: calc++-parser.yy @example // The parsing context. -%parse-param @{ calcxx_driver& driver @} -%lex-param @{ calcxx_driver& driver @} +%param @{ calcxx_driver& driver @} @end example @noindent -Then we request the location tracking feature, and initialize the -first location's file name. Afterwards new locations are computed +Then we request location tracking, and initialize the +first location's file name. Afterward new locations are computed relatively to the previous locations: the file name will be -automatically propagated. +propagated. @comment file: calc++-parser.yy @example @@ -8062,27 +9156,13 @@ automatically propagated. @end example @noindent -Use the two following directives to enable parser tracing and verbose +Use the following two directives to enable parser tracing and verbose error messages. @comment file: calc++-parser.yy @example -%debug -%error-verbose -@end example - -@noindent -Semantic values cannot use ``real'' objects, but only pointers to -them. - -@comment file: calc++-parser.yy -@example -// Symbols. -%union -@{ - int ival; - std::string *sval; -@}; +%define parse.trace +%define parse.error verbose @end example @noindent @@ -8092,7 +9172,8 @@ The code between @samp{%code @{} and @samp{@}} is output in the @comment file: calc++-parser.yy @example -%code @{ +%code +@{ # include "calc++-driver.hh" @} @end example @@ -8100,35 +9181,53 @@ The code between @samp{%code @{} and @samp{@}} is output in the @noindent The token numbered as 0 corresponds to end of file; the following line -allows for nicer error messages referring to ``end of file'' instead -of ``$end''. Similarly user friendly named are provided for each -symbol. Note that the tokens names are prefixed by @code{TOKEN_} to -avoid name clashes. +allows for nicer error messages referring to ``end of file'' instead of +``$end''. Similarly user friendly names are provided for each symbol. +To avoid name clashes in the generated files (@pxref{Calc++ Scanner}), +prefix tokens with @code{TOK_} (@pxref{Decl Summary,, api.tokens.prefix}). @comment file: calc++-parser.yy @example -%token END 0 "end of file" -%token ASSIGN ":=" -%token IDENTIFIER "identifier" -%token NUMBER "number" -%type exp +%define api.tokens.prefix "TOK_" +%token + END 0 "end of file" + ASSIGN ":=" + MINUS "-" + PLUS "+" + STAR "*" + SLASH "/" + LPAREN "(" + RPAREN ")" +; @end example @noindent -To enable memory deallocation during error recovery, use -@code{%destructor}. +Since we use variant-based semantic values, @code{%union} is not used, and +both @code{%type} and @code{%token} expect genuine types, as opposed to type +tags. -@c FIXME: Document %printer, and mention that it takes a braced-code operand. @comment file: calc++-parser.yy @example -%printer @{ debug_stream () << *$$; @} "identifier" -%destructor @{ delete $$; @} "identifier" +%token IDENTIFIER "identifier" +%token NUMBER "number" +%type exp +@end example + +@noindent +No @code{%destructor} is needed to enable memory deallocation during error +recovery; the memory, for strings for instance, will be reclaimed by the +regular destructors. All the values are printed using their +@code{operator<<}. -%printer @{ debug_stream () << $$; @} +@c FIXME: Document %printer, and mention that it takes a braced-code operand. +@comment file: calc++-parser.yy +@example +%printer @{ debug_stream () << $$; @} <*>; @end example @noindent -The grammar itself is straightforward. +The grammar itself is straightforward (@pxref{Location Tracking Calc, , +Location Tracking Calculator: @code{ltcalc}}). @comment file: calc++-parser.yy @example @@ -8136,21 +9235,23 @@ The grammar itself is straightforward. %start unit; unit: assignments exp @{ driver.result = $2; @}; -assignments: assignments assignment @{@} - | /* Nothing. */ @{@}; +assignments: + assignments assignment @{@} +| /* Nothing. */ @{@}; assignment: - "identifier" ":=" exp - @{ driver.variables[*$1] = $3; delete $1; @}; - -%left '+' '-'; -%left '*' '/'; -exp: exp '+' exp @{ $$ = $1 + $3; @} - | exp '-' exp @{ $$ = $1 - $3; @} - | exp '*' exp @{ $$ = $1 * $3; @} - | exp '/' exp @{ $$ = $1 / $3; @} - | "identifier" @{ $$ = driver.variables[*$1]; delete $1; @} - | "number" @{ $$ = $1; @}; + "identifier" ":=" exp @{ driver.variables[$1] = $3; @}; + +%left "+" "-"; +%left "*" "/"; +exp: + exp "+" exp @{ $$ = $1 + $3; @} +| exp "-" exp @{ $$ = $1 - $3; @} +| exp "*" exp @{ $$ = $1 * $3; @} +| exp "/" exp @{ $$ = $1 / $3; @} +| "(" exp ")" @{ std::swap($$, $2); @} +| "identifier" @{ $$ = driver.variables[$1]; @} +| "number" @{ std::swap($$, $1); @}; %% @end example @@ -8161,7 +9262,7 @@ driver. @comment file: calc++-parser.yy @example void -yy::calcxx_parser::error (const yy::calcxx_parser::location_type& l, +yy::calcxx_parser::error (const location_type& l, const std::string& m) @{ driver.error (l, m); @@ -8177,24 +9278,22 @@ parser's to get the set of defined tokens. @comment file: calc++-scanner.ll @example %@{ /* -*- C++ -*- */ +# include +# include # include -# include -# include # include # include "calc++-driver.hh" # include "calc++-parser.hh" -/* Work around an incompatibility in flex (at least versions - 2.5.31 through 2.5.33): it generates code that does - not conform to C89. See Debian bug 333231 - . */ +// Work around an incompatibility in flex (at least versions +// 2.5.31 through 2.5.33): it generates code that does +// not conform to C89. See Debian bug 333231 +// . # undef yywrap # define yywrap() 1 -/* By default yylex returns int, we use token_type. - Unfortunately yyterminate by default returns 0, which is - not of token_type. */ -#define yyterminate() return token::END +// The location of the current token. +static yy::location loc; %@} @end example @@ -8202,7 +9301,7 @@ parser's to get the set of defined tokens. Because there is no @code{#include}-like feature we don't need @code{yywrap}, we don't need @code{unput} either, and we parse an actual file, this is not an interactive session with the user. -Finally we enable the scanner tracing features. +Finally, we enable scanner tracing. @comment file: calc++-scanner.ll @example @@ -8222,8 +9321,8 @@ blank [ \t] @noindent The following paragraph suffices to track locations accurately. Each time @code{yylex} is invoked, the begin position is moved onto the end -position. Then when a pattern is matched, the end position is -advanced of its width. In case it matched ends of lines, the end +position. Then when a pattern is matched, its width is added to the end +column. When matching ends of lines, the end cursor is adjusted, and each time blanks are matched, the begin cursor is moved onto the end cursor to effectively ignore the blanks preceding tokens. Comments would be treated equally. @@ -8231,45 +9330,46 @@ preceding tokens. Comments would be treated equally. @comment file: calc++-scanner.ll @example %@{ -# define YY_USER_ACTION yylloc->columns (yyleng); + // Code run each time a pattern is matched. + # define YY_USER_ACTION loc.columns (yyleng); %@} %% %@{ - yylloc->step (); + // Code run each time yylex is called. + loc.step (); %@} -@{blank@}+ yylloc->step (); -[\n]+ yylloc->lines (yyleng); yylloc->step (); +@{blank@}+ loc.step (); +[\n]+ loc.lines (yyleng); loc.step (); @end example @noindent -The rules are simple, just note the use of the driver to report errors. -It is convenient to use a typedef to shorten -@code{yy::calcxx_parser::token::identifier} into -@code{token::identifier} for instance. +The rules are simple. The driver is used to report errors. @comment file: calc++-scanner.ll @example -%@{ - typedef yy::calcxx_parser::token token; -%@} - /* Convert ints to the actual type of tokens. */ -[-+*/] return yy::calcxx_parser::token_type (yytext[0]); -":=" return token::ASSIGN; +"-" return yy::calcxx_parser::make_MINUS(loc); +"+" return yy::calcxx_parser::make_PLUS(loc); +"*" return yy::calcxx_parser::make_STAR(loc); +"/" return yy::calcxx_parser::make_SLASH(loc); +"(" return yy::calcxx_parser::make_LPAREN(loc); +")" return yy::calcxx_parser::make_RPAREN(loc); +":=" return yy::calcxx_parser::make_ASSIGN(loc); + @{int@} @{ errno = 0; long n = strtol (yytext, NULL, 10); if (! (INT_MIN <= n && n <= INT_MAX && errno != ERANGE)) - driver.error (*yylloc, "integer is out of range"); - yylval->ival = n; - return token::NUMBER; + driver.error (loc, "integer is out of range"); + return yy::calcxx_parser::make_NUMBER(n, loc); @} -@{id@} yylval->sval = new std::string (yytext); return token::IDENTIFIER; -. driver.error (*yylloc, "invalid character"); +@{id@} return yy::calcxx_parser::make_IDENTIFIER(yytext, loc); +. driver.error (loc, "invalid character"); +<> return yy::calcxx_parser::make_END(loc); %% @end example @noindent -Finally, because the scanner related driver's member function depend +Finally, because the scanner-related driver's member-functions depend on the scanner's data, it is simpler to implement them in this file. @comment file: calc++-scanner.ll @@ -8282,7 +9382,7 @@ calcxx_driver::scan_begin () yyin = stdin; else if (!(yyin = fopen (file.c_str (), "r"))) @{ - error (std::string ("cannot open ") + file); + error (std::string ("cannot open ") + file + ": " + strerror(errno)); exit (1); @} @} @@ -8307,6 +9407,7 @@ The top level file, @file{calc++.cc}, poses no problem. int main (int argc, char *argv[]) @{ + int res = 0; calcxx_driver driver; for (++argv; argv[0]; ++argv) if (*argv == std::string ("-p")) @@ -8315,6 +9416,9 @@ main (int argc, char *argv[]) driver.trace_scanning = true; else if (!driver.parse (*argv)) std::cout << driver.result << std::endl; + else + res = 1; + return res; @} @end example @@ -8322,47 +9426,70 @@ main (int argc, char *argv[]) @section Java Parsers @menu -* Java Bison Interface:: Asking for Java parser generation -* Java Semantic Values:: %type and %token vs. Java -* Java Location Values:: The position and location classes -* Java Parser Interface:: Instantiating and running the parser -* Java Scanner Interface:: Java scanners, and pure parsers -* Java Differences:: Differences between C/C++ and Java Grammars +* Java Bison Interface:: Asking for Java parser generation +* Java Semantic Values:: %type and %token vs. Java +* Java Location Values:: The position and location classes +* Java Parser Interface:: Instantiating and running the parser +* Java Scanner Interface:: Specifying the scanner for the parser +* Java Action Features:: Special features for use in actions +* Java Differences:: Differences between C/C++ and Java Grammars +* Java Declarations Summary:: List of Bison declarations used with Java @end menu @node Java Bison Interface @subsection Java Bison Interface @c - %language "Java" -@c - initial action -The Java parser skeletons are selected using a language directive, -@samp{%language "Java"}, or the synonymous command-line option -@option{--language=java}. +(The current Java interface is experimental and may evolve. +More user feedback will help to stabilize it.) -When run, @command{bison} will create several entities whose name -starts with @samp{YY}. Use the @samp{%name-prefix} directive to -change the prefix, see @ref{Decl Summary}; classes can be placed -in an arbitrary Java package using a @samp{%define package} section. +The Java parser skeletons are selected using the @code{%language "Java"} +directive or the @option{-L java}/@option{--language=java} option. -The parser class defines an inner class, @code{Location}, that is used -for location tracking. If the parser is pure, it also defines an -inner interface, @code{Lexer}; see~@ref{Java Scanner Interface} for the -meaning of pure parsers when the Java language is chosen. Other than -these inner class/interface, and the members described in~@ref{Java -Parser Interface}, all the other members and fields are preceded -with a @code{yy} prefix to avoid clashes with user code. - -No header file can be generated for Java parsers; you must not pass -@option{-d}/@option{--defines} to @command{bison}, nor use the -@samp{%defines} directive. +@c FIXME: Documented bug. +When generating a Java parser, @code{bison @var{basename}.y} will create +a single Java source file named @file{@var{basename}.java}. Using an +input file without a @file{.y} suffix is currently broken. The basename +of the output file can be changed by the @code{%file-prefix} directive +or the @option{-p}/@option{--name-prefix} option. The entire output file +name can be changed by the @code{%output} directive or the +@option{-o}/@option{--output} option. The output file contains a single +class for the parser. -By default, the @samp{YYParser} class has package visibility. A -declaration @samp{%define "public"} will change to public visibility. -Remember that, according to the Java language specification, the name -of the @file{.java} file should match the name of the class in this -case. +You can create documentation for generated parsers using Javadoc. + +Contrary to C parsers, Java parsers do not use global variables; the +state of the parser is always local to an instance of the parser class. +Therefore, all Java parsers are ``pure'', and the @code{%pure-parser} +and @samp{%define api.pure} directives does not do anything when used in +Java. + +Push parsers are currently unsupported in Java and @code{%define +api.push-pull} have no effect. + +@acronym{GLR} parsers are currently unsupported in Java. Do not use the +@code{glr-parser} directive. + +No header file can be generated for Java parsers. Do not use the +@code{%defines} directive or the @option{-d}/@option{--defines} options. + +@c FIXME: Possible code change. +Currently, support for tracing is always compiled +in. Thus the @samp{%define parse.trace} and @samp{%token-table} +directives and the +@option{-t}/@option{--debug} and @option{-k}/@option{--token-table} +options have no effect. This may change in the future to eliminate +unused code in the generated parser, so use @samp{%define parse.trace} +explicitly +if needed. Also, in the future the +@code{%token-table} directive might enable a public interface to +access the token names and codes. + +Getting a ``code too large'' error from the Java compiler means the code +hit the 64KB bytecode per method limitation of the Java class file. +Try reducing the amount of code in actions and static initializers; +otherwise, report a bug so that the parser skeleton will be improved. -All these files are documented using Javadoc. @node Java Semantic Values @subsection Java Semantic Values @@ -8382,20 +9509,23 @@ semantic values' types (class names) should be specified in the By default, the semantic stack is declared to have @code{Object} members, which means that the class types you specify can be of any class. To improve the type safety of the parser, you can declare the common -superclass of all the semantic values using the @samp{%define} directive. -For example, after the following declaration: +superclass of all the semantic values using the @samp{%define stype} +directive. For example, after the following declaration: @example -%define "union_name" "ASTNode" +%define stype "ASTNode" @end example @noindent any @code{%type} or @code{%token} specifying a semantic type which is not a subclass of ASTNode, will cause a compile-time error. +@c FIXME: Documented bug. Types used in the directives may be qualified with a package name. Primitive data types are accepted for Java version 1.5 or later. Note that in this case the autoboxing feature of Java 1.5 will be used. +Generic types may not be used; this is due to a limitation in the +implementation of Bison, and may change in future releases. Java parsers do not support @code{%destructor}, since the language adopts garbage collection. The parser will try to hold references @@ -8418,20 +9548,29 @@ An auxiliary user-defined class defines a @dfn{position}, a single point in a file; Bison itself defines a class representing a @dfn{location}, a range composed of a pair of positions (possibly spanning several files). The location class is an inner class of the parser; the name -is @code{Location} by default, may also be renamed using @code{%define -"location_type" "@var{class-name}}. +is @code{Location} by default, and may also be renamed using +@samp{%define location_type "@var{class-name}"}. The location class treats the position as a completely opaque value. By default, the class name is @code{Position}, but this can be changed -with @code{%define "position_type" "@var{class-name}"}. +with @samp{%define position_type "@var{class-name}"}. This class must +be supplied by the user. -@deftypemethod {Location} {Position} begin -@deftypemethodx {Location} {Position} end +@deftypeivar {Location} {Position} begin +@deftypeivarx {Location} {Position} end The first, inclusive, position of the range, and the first beyond. -@end deftypemethod +@end deftypeivar -@deftypemethod {Location} {void} toString () +@deftypeop {Constructor} {Location} {} Location (Position @var{loc}) +Create a @code{Location} denoting an empty range located at a given point. +@end deftypeop + +@deftypeop {Constructor} {Location} {} Location (Position @var{begin}, Position @var{end}) +Create a @code{Location} from the endpoints of the range. +@end deftypeop + +@deftypemethod {Location} {String} toString () Prints the range represented by the location. For this to work properly, the position class should override the @code{equals} and @code{toString} methods appropriately. @@ -8446,28 +9585,86 @@ properly, the position class should override the @code{equals} and @c debug_stream. @c - Reporting errors -The output file defines the parser class in the package optionally -indicated in the @code{%define package} section. The class name defaults -to @code{YYParser}. The @code{YY} prefix may be changed using -@samp{%name-prefix}; alternatively, you can use @samp{%define -"parser_class_name" "@var{name}"} to give a custom name to the class. -The interface of this class is detailed below. It can be extended using -the @code{%parse-param} directive; each occurrence of the directive will -add a field to the parser class, and an argument to its constructor. +The name of the generated parser class defaults to @code{YYParser}. The +@code{YY} prefix may be changed using the @code{%name-prefix} directive +or the @option{-p}/@option{--name-prefix} option. Alternatively, use +@samp{%define parser_class_name "@var{name}"} to give a custom name to +the class. The interface of this class is detailed below. + +By default, the parser class has package visibility. A declaration +@samp{%define public} will change to public visibility. Remember that, +according to the Java language specification, the name of the @file{.java} +file should match the name of the class in this case. Similarly, you can +use @code{abstract}, @code{final} and @code{strictfp} with the +@code{%define} declaration to add other modifiers to the parser class. +A single @samp{%define annotations "@var{annotations}"} directive can +be used to add any number of annotations to the parser class. + +The Java package name of the parser class can be specified using the +@samp{%define package} directive. The superclass and the implemented +interfaces of the parser class can be specified with the @code{%define +extends} and @samp{%define implements} directives. -@deftypemethod {YYParser} {} YYParser (@var{type1} @var{arg1}, ...) -Build a new parser object. There are no arguments by default, unless -@samp{%parse-param @{@var{type1} @var{arg1}@}} was used. -@end deftypemethod +The parser class defines an inner class, @code{Location}, that is used +for location tracking (see @ref{Java Location Values}), and a inner +interface, @code{Lexer} (see @ref{Java Scanner Interface}). Other than +these inner class/interface, and the members described in the interface +below, all the other members and fields are preceded with a @code{yy} or +@code{YY} prefix to avoid clashes with user code. + +The parser class can be extended using the @code{%parse-param} +directive. Each occurrence of the directive will add a @code{protected +final} field to the parser class, and an argument to its constructor, +which initialize them automatically. + +@deftypeop {Constructor} {YYParser} {} YYParser (@var{lex_param}, @dots{}, @var{parse_param}, @dots{}) +Build a new parser object with embedded @code{%code lexer}. There are +no parameters, unless @code{%param}s and/or @code{%parse-param}s and/or +@code{%lex-param}s are used. + +Use @code{%code init} for code added to the start of the constructor +body. This is especially useful to initialize superclasses. Use +@samp{%define init_throws} to specify any uncaught exceptions. +@end deftypeop + +@deftypeop {Constructor} {YYParser} {} YYParser (Lexer @var{lexer}, @var{parse_param}, @dots{}) +Build a new parser object using the specified scanner. There are no +additional parameters unless @code{%param}s and/or @code{%parse-param}s are +used. + +If the scanner is defined by @code{%code lexer}, this constructor is +declared @code{protected} and is called automatically with a scanner +created with the correct @code{%param}s and/or @code{%lex-param}s. + +Use @code{%code init} for code added to the start of the constructor +body. This is especially useful to initialize superclasses. Use +@samp{%define init_throws} to specify any uncatch exceptions. +@end deftypeop @deftypemethod {YYParser} {boolean} parse () Run the syntactic analysis, and return @code{true} on success, @code{false} otherwise. @end deftypemethod -@deftypemethod {YYParser} {boolean} yyrecovering () +@deftypemethod {YYParser} {boolean} getErrorVerbose () +@deftypemethodx {YYParser} {void} setErrorVerbose (boolean @var{verbose}) +Get or set the option to produce verbose error messages. These are only +available with @samp{%define parse.error verbose}, which also turns on +verbose error messages. +@end deftypemethod + +@deftypemethod {YYParser} {void} yyerror (String @var{msg}) +@deftypemethodx {YYParser} {void} yyerror (Position @var{pos}, String @var{msg}) +@deftypemethodx {YYParser} {void} yyerror (Location @var{loc}, String @var{msg}) +Print an error message using the @code{yyerror} method of the scanner +instance in use. The @code{Location} and @code{Position} parameters are +available only if location tracking is active. +@end deftypemethod + +@deftypemethod {YYParser} {boolean} recovering () During the syntactic analysis, return @code{true} if recovering -from a syntax error. @xref{Error Recovery}. +from a syntax error. +@xref{Error Recovery}. @end deftypemethod @deftypemethod {YYParser} {java.io.PrintStream} getDebugStream () @@ -8482,133 +9679,172 @@ Get or set the tracing level. Currently its value is either 0, no trace, or nonzero, full tracing. @end deftypemethod -@deftypemethod {YYParser} {void} error (Location @var{l}, String @var{m}) -The definition for this member function must be supplied by the user -in the same way as the scanner interface (@pxref{Java Scanner -Interface}); the parser uses it to report a parser error occurring at -@var{l}, described by @var{m}. -@end deftypemethod +@deftypecv {Constant} {YYParser} {String} {bisonVersion} +@deftypecvx {Constant} {YYParser} {String} {bisonSkeleton} +Identify the Bison version and skeleton used to generate this parser. +@end deftypecv @node Java Scanner Interface @subsection Java Scanner Interface -@c - prefix for yylex. -@c - Pure interface to yylex +@c - %code lexer @c - %lex-param +@c - Lexer interface There are two possible ways to interface a Bison-generated Java parser -with a scanner. +with a scanner: the scanner may be defined by @code{%code lexer}, or +defined elsewhere. In either case, the scanner has to implement the +@code{Lexer} inner interface of the parser class. This interface also +contain constants for all user-defined token names and the predefined +@code{EOF} token. + +In the first case, the body of the scanner class is placed in +@code{%code lexer} blocks. If you want to pass parameters from the +parser constructor to the scanner constructor, specify them with +@code{%lex-param}; they are passed before @code{%parse-param}s to the +constructor. + +In the second case, the scanner has to implement the @code{Lexer} interface, +which is defined within the parser class (e.g., @code{YYParser.Lexer}). +The constructor of the parser object will then accept an object +implementing the interface; @code{%lex-param} is not used in this +case. -@cindex pure parser, in Java -Contrary to C parsers, Java parsers do not use global variables; the -state of the parser is always local to an instance of the parser class. -Therefore, all Java parsers are ``pure'' in the C sense. The -@code{%pure-parser} directive can still be used in Java, and it -will control whether the lexer resides in a separate class than the -Bison-generated parser (therefore, Bison generates a class that is -``purely'' a parser), or in the same class. The interface to the scanner -is similar, though the two cases present a slightly different naming. - -For the @code{%pure-parser} case, the scanner implements an interface -called @code{Lexer} and defined within the parser class (e.g., -@code{YYParser.Lexer}. The constructor of the parser object accepts -an object implementing the interface. The interface specifies -the following methods. - -@deftypemethod {Lexer} {void} error (Location @var{l}, String @var{m}) -As explained in @pxref{Java Parser Interface}, this method is defined -by the user to emit an error message. The first parameter is not used -unless location tracking is active. Its type can be changed using -@samp{%define "location_type" "@var{class-name}".} +In both cases, the scanner has to implement the following methods. + +@deftypemethod {Lexer} {void} yyerror (Location @var{loc}, String @var{msg}) +This method is defined by the user to emit an error message. The first +parameter is omitted if location tracking is not active. Its type can be +changed using @samp{%define location_type "@var{class-name}".} @end deftypemethod -@deftypemethod {Lexer} {int} yylex (@var{type1} @var{arg1}, ...) +@deftypemethod {Lexer} {int} yylex () Return the next token. Its type is the return value, its semantic -value and location are saved and returned by the ther methods in the -interface. Invocations of @samp{%lex-param @{@var{type1} -@var{arg1}@}} yield additional arguments. +value and location are saved and returned by the their methods in the +interface. + +Use @samp{%define lex_throws} to specify any uncaught exceptions. +Default is @code{java.io.IOException}. @end deftypemethod @deftypemethod {Lexer} {Position} getStartPos () @deftypemethodx {Lexer} {Position} getEndPos () -Return respectively the first position of the last token that yylex -returned, and the first position beyond it. These methods are not -needed unless location tracking is active. +Return respectively the first position of the last token that +@code{yylex} returned, and the first position beyond it. These +methods are not needed unless location tracking is active. -The return type can be changed using @samp{%define "position_type" +The return type can be changed using @samp{%define position_type "@var{class-name}".} @end deftypemethod @deftypemethod {Lexer} {Object} getLVal () -Return respectively the first position of the last token that yylex -returned, and the first position beyond it. +Return the semantic value of the last token that yylex returned. -The return type can be changed using @samp{%define "union_name" +The return type can be changed using @samp{%define stype "@var{class-name}".} @end deftypemethod -If @code{%pure-parser} is not specified, the lexer interface -resides in the same class (@code{YYParser}) as the Bison-generated -parser. The fields and methods that are provided to -this end are as follows. - -@deftypemethod {YYParser} {void} error (Location @var{l}, String @var{m}) -As explained in @pxref{Java Parser Interface}, this method is defined -by the user to emit an error message. The first parameter is not used -unless location tracking is active. Its type can be changed using -@samp{%define "location_type" "@var{class-name}".} -@end deftypemethod +@node Java Action Features +@subsection Special Features for Use in Java Actions + +The following special constructs can be uses in Java actions. +Other analogous C action features are currently unavailable for Java. + +Use @samp{%define throws} to specify any uncaught exceptions from parser +actions, and initial actions specified by @code{%initial-action}. + +@defvar $@var{n} +The semantic value for the @var{n}th component of the current rule. +This may not be assigned to. +@xref{Java Semantic Values}. +@end defvar + +@defvar $<@var{typealt}>@var{n} +Like @code{$@var{n}} but specifies a alternative type @var{typealt}. +@xref{Java Semantic Values}. +@end defvar + +@defvar $$ +The semantic value for the grouping made by the current rule. As a +value, this is in the base type (@code{Object} or as specified by +@samp{%define stype}) as in not cast to the declared subtype because +casts are not allowed on the left-hand side of Java assignments. +Use an explicit Java cast if the correct subtype is needed. +@xref{Java Semantic Values}. +@end defvar + +@defvar $<@var{typealt}>$ +Same as @code{$$} since Java always allow assigning to the base type. +Perhaps we should use this and @code{$<>$} for the value and @code{$$} +for setting the value but there is currently no easy way to distinguish +these constructs. +@xref{Java Semantic Values}. +@end defvar + +@defvar @@@var{n} +The location information of the @var{n}th component of the current rule. +This may not be assigned to. +@xref{Java Location Values}. +@end defvar + +@defvar @@$ +The location information of the grouping made by the current rule. +@xref{Java Location Values}. +@end defvar + +@deffn {Statement} {return YYABORT;} +Return immediately from the parser, indicating failure. +@xref{Java Parser Interface}. +@end deffn -@deftypemethod {YYParser} {int} yylex (@var{type1} @var{arg1}, ...) -Return the next token. Its type is the return value, its semantic -value and location are saved into @code{yylval}, @code{yystartpos}, -@code{yyendpos}. Invocations of @samp{%lex-param @{@var{type1} -@var{arg1}@}} yield additional arguments. -@end deftypemethod +@deffn {Statement} {return YYACCEPT;} +Return immediately from the parser, indicating success. +@xref{Java Parser Interface}. +@end deffn -@deftypecv {Field} {YYParser} Position yystartpos -@deftypecvx {Field} {YYParser} Position yyendpos -Contain respectively the first position of the last token that yylex -returned, and the first position beyond it. These methods are not -needed unless location tracking is active. +@deffn {Statement} {return YYERROR;} +Start error recovery without printing an error message. +@xref{Error Recovery}. +@end deffn -The field's type can be changed using @samp{%define "position_type" -"@var{class-name}".} -@end deftypecv +@deffn {Statement} {return YYFAIL;} +Print an error message and start error recovery. +@xref{Error Recovery}. +@end deffn -@deftypecv {Field} {YYParser} Object yylval -Return respectively the first position of the last token that yylex -returned, and the first position beyond it. +@deftypefn {Function} {boolean} recovering () +Return whether error recovery is being done. In this state, the parser +reads token until it reaches a known state, and then restarts normal +operation. +@xref{Error Recovery}. +@end deftypefn -The field's type can be changed using @samp{%define "union_name" -"@var{class-name}".} -@end deftypecv +@deftypefn {Function} {void} yyerror (String @var{msg}) +@deftypefnx {Function} {void} yyerror (Position @var{loc}, String @var{msg}) +@deftypefnx {Function} {void} yyerror (Location @var{loc}, String @var{msg}) +Print an error message using the @code{yyerror} method of the scanner +instance in use. The @code{Location} and @code{Position} parameters are +available only if location tracking is active. +@end deftypefn -By default the class generated for a non-pure Java parser is abstract, -and the methods @code{yylex} and @code{yyerror} shall be placed in a -subclass (possibly defined in the additional code section). It is -also possible, using the @code{%define "single_class"} declaration, to -define the scanner in the same class as the parser; when this -declaration is present, the class is not declared as abstract. -In order to place the declarations for the scanner inside the -parser class, you should use @code{%code} sections. @node Java Differences @subsection Differences between C/C++ and Java Grammars The different structure of the Java language forces several differences between C/C++ grammars, and grammars designed for Java parsers. This -section summarizes this differences. +section summarizes these differences. @itemize @item -Since Java lacks a preprocessor, the @code{YYERROR}, @code{YYACCEPT}, +Java lacks a preprocessor, so the @code{YYERROR}, @code{YYACCEPT}, @code{YYABORT} symbols (@pxref{Table of Symbols}) cannot obviously be -macros. Instead, they should be preceded in an action with -@code{return}. The actual definition of these symbols should be +macros. Instead, they should be preceded by @code{return} when they +appear in an action. The actual definition of these symbols is opaque to the Bison grammar, and it might change in the future. The only meaningful operation that you can do, is to return them. +See @pxref{Java Action Features}. Note that of these three symbols, only @code{YYACCEPT} and @code{YYABORT} will cause a return from the @code{yyparse} @@ -8617,22 +9853,199 @@ method than @code{yyparse} in order to have an intuitive syntax that corresponds to these C macros.}. @item -The prolog declarations have a different meaning than in C/C++ code. -@table @code -@item %code -@code{%code imports} blocks are placed at the beginning of the Java -source code. They may include copyright notices. For a @code{package} -declarations, it is suggested to use @code{%define package} instead. +Java lacks unions, so @code{%union} has no effect. Instead, semantic +values have a common base type: @code{Object} or as specified by +@samp{%define stype}. Angle brackets on @code{%token}, @code{type}, +@code{$@var{n}} and @code{$$} specify subtypes rather than fields of +an union. The type of @code{$$}, even with angle brackets, is the base +type since Java casts are not allow on the left-hand side of assignments. +Also, @code{$@var{n}} and @code{@@@var{n}} are not allowed on the +left-hand side of assignments. See @pxref{Java Semantic Values} and +@pxref{Java Action Features}. -@code{%code} blocks are placed inside the parser class. If @code{%define -single_class} is being used, the definitions of @code{yylex} and -@code{yyerror} should be placed here. Subroutines for the parser actions -may be included in this kind of block. +@item +The prologue declarations have a different meaning than in C/C++ code. +@table @asis +@item @code{%code imports} +blocks are placed at the beginning of the Java source code. They may +include copyright notices. For a @code{package} declarations, it is +suggested to use @samp{%define package} instead. + +@item unqualified @code{%code} +blocks are placed inside the parser class. + +@item @code{%code lexer} +blocks, if specified, should include the implementation of the +scanner. If there is no such block, the scanner can be any class +that implements the appropriate interface (see @pxref{Java Scanner +Interface}). +@end table Other @code{%code} blocks are not supported in Java parsers. -@end table +In particular, @code{%@{ @dots{} %@}} blocks should not be used +and may give an error in future versions of Bison. + +The epilogue has the same meaning as in C/C++ code and it can +be used to define other classes used by the parser @emph{outside} +the parser class. @end itemize + +@node Java Declarations Summary +@subsection Java Declarations Summary + +This summary only include declarations specific to Java or have special +meaning when used in a Java parser. + +@deffn {Directive} {%language "Java"} +Generate a Java class for the parser. +@end deffn + +@deffn {Directive} %lex-param @{@var{type} @var{name}@} +A parameter for the lexer class defined by @code{%code lexer} +@emph{only}, added as parameters to the lexer constructor and the parser +constructor that @emph{creates} a lexer. Default is none. +@xref{Java Scanner Interface}. +@end deffn + +@deffn {Directive} %name-prefix "@var{prefix}" +The prefix of the parser class name @code{@var{prefix}Parser} if +@samp{%define parser_class_name} is not used. Default is @code{YY}. +@xref{Java Bison Interface}. +@end deffn + +@deffn {Directive} %parse-param @{@var{type} @var{name}@} +A parameter for the parser class added as parameters to constructor(s) +and as fields initialized by the constructor(s). Default is none. +@xref{Java Parser Interface}. +@end deffn + +@deffn {Directive} %token <@var{type}> @var{token} @dots{} +Declare tokens. Note that the angle brackets enclose a Java @emph{type}. +@xref{Java Semantic Values}. +@end deffn + +@deffn {Directive} %type <@var{type}> @var{nonterminal} @dots{} +Declare the type of nonterminals. Note that the angle brackets enclose +a Java @emph{type}. +@xref{Java Semantic Values}. +@end deffn + +@deffn {Directive} %code @{ @var{code} @dots{} @} +Code appended to the inside of the parser class. +@xref{Java Differences}. +@end deffn + +@deffn {Directive} {%code imports} @{ @var{code} @dots{} @} +Code inserted just after the @code{package} declaration. +@xref{Java Differences}. +@end deffn + +@deffn {Directive} {%code init} @{ @var{code} @dots{} @} +Code inserted at the beginning of the parser constructor body. +@xref{Java Parser Interface}. +@end deffn + +@deffn {Directive} {%code lexer} @{ @var{code} @dots{} @} +Code added to the body of a inner lexer class within the parser class. +@xref{Java Scanner Interface}. +@end deffn + +@deffn {Directive} %% @var{code} @dots{} +Code (after the second @code{%%}) appended to the end of the file, +@emph{outside} the parser class. +@xref{Java Differences}. +@end deffn + +@deffn {Directive} %@{ @var{code} @dots{} %@} +Not supported. Use @code{%code imports} instead. +@xref{Java Differences}. +@end deffn + +@deffn {Directive} {%define abstract} +Whether the parser class is declared @code{abstract}. Default is false. +@xref{Java Bison Interface}. +@end deffn + +@deffn {Directive} {%define annotations} "@var{annotations}" +The Java annotations for the parser class. Default is none. +@xref{Java Bison Interface}. +@end deffn + +@deffn {Directive} {%define extends} "@var{superclass}" +The superclass of the parser class. Default is none. +@xref{Java Bison Interface}. +@end deffn + +@deffn {Directive} {%define final} +Whether the parser class is declared @code{final}. Default is false. +@xref{Java Bison Interface}. +@end deffn + +@deffn {Directive} {%define implements} "@var{interfaces}" +The implemented interfaces of the parser class, a comma-separated list. +Default is none. +@xref{Java Bison Interface}. +@end deffn + +@deffn {Directive} {%define init_throws} "@var{exceptions}" +The exceptions thrown by @code{%code init} from the parser class +constructor. Default is none. +@xref{Java Parser Interface}. +@end deffn + +@deffn {Directive} {%define lex_throws} "@var{exceptions}" +The exceptions thrown by the @code{yylex} method of the lexer, a +comma-separated list. Default is @code{java.io.IOException}. +@xref{Java Scanner Interface}. +@end deffn + +@deffn {Directive} {%define location_type} "@var{class}" +The name of the class used for locations (a range between two +positions). This class is generated as an inner class of the parser +class by @command{bison}. Default is @code{Location}. +@xref{Java Location Values}. +@end deffn + +@deffn {Directive} {%define package} "@var{package}" +The package to put the parser class in. Default is none. +@xref{Java Bison Interface}. +@end deffn + +@deffn {Directive} {%define parser_class_name} "@var{name}" +The name of the parser class. Default is @code{YYParser} or +@code{@var{name-prefix}Parser}. +@xref{Java Bison Interface}. +@end deffn + +@deffn {Directive} {%define position_type} "@var{class}" +The name of the class used for positions. This class must be supplied by +the user. Default is @code{Position}. +@xref{Java Location Values}. +@end deffn + +@deffn {Directive} {%define public} +Whether the parser class is declared @code{public}. Default is false. +@xref{Java Bison Interface}. +@end deffn + +@deffn {Directive} {%define stype} "@var{class}" +The base type of semantic values. Default is @code{Object}. +@xref{Java Semantic Values}. +@end deffn + +@deffn {Directive} {%define strictfp} +Whether the parser class is declared @code{strictfp}. Default is false. +@xref{Java Bison Interface}. +@end deffn + +@deffn {Directive} {%define throws} "@var{exceptions}" +The exceptions thrown by user-supplied parser actions and +@code{%initial-action}, a comma-separated list. Default is none. +@xref{Java Parser Interface}. +@end deffn + + @c ================================================= FAQ @node FAQ @@ -8687,7 +10100,7 @@ or @display My parser includes support for an @samp{#include}-like feature, in which case I run @code{yyparse} from @code{yyparse}. This fails -although I did specify I needed a @code{%pure-parser}. +although I did specify @samp{%define api.pure}. @end display These problems typically come not from Bison itself, but from @@ -9113,10 +10526,6 @@ Insert @var{code} verbatim into output parser source. Equip the parser for debugging. @xref{Decl Summary}. @end deffn -@deffn {Directive} %debug -Equip the parser for debugging. @xref{Decl Summary}. -@end deffn - @ifset defaultprec @deffn {Directive} %default-prec Assign a precedence to rules that lack an explicit @samp{%prec} @@ -9127,6 +10536,7 @@ Precedence}. @deffn {Directive} %define @var{define-variable} @deffnx {Directive} %define @var{define-variable} @var{value} +@deffnx {Directive} %define @var{define-variable} "@var{value}" Define a variable to adjust Bison's behavior. @xref{Decl Summary,,%define}. @end deffn @@ -9169,8 +10579,7 @@ token is reset to the token that originally caused the violation. @end deffn @deffn {Directive} %error-verbose -Bison declaration to request verbose, specific error message strings -when @code{yyerror} is called. +An obsolete directive standing for @samp{%define parse.error verbose}. @end deffn @deffn {Directive} %file-prefix "@var{prefix}" @@ -9193,12 +10602,12 @@ Specify the programming language for the generated parser. @end deffn @deffn {Directive} %left -Bison declaration to assign left associativity to token(s). +Bison declaration to assign precedence and left associativity to token(s). @xref{Precedence Decl, ,Operator Precedence}. @end deffn -@deffn {Directive} %lex-param @{@var{argument-declaration}@} -Bison declaration to specifying an additional parameter that +@deffn {Directive} %lex-param @{@var{argument-declaration}@} @dots{} +Bison declaration to specifying additional arguments that @code{yylex} should accept. @xref{Pure Calling,, Calling Conventions for Pure Parsers}. @end deffn @@ -9228,7 +10637,7 @@ parser file. @xref{Decl Summary}. @end deffn @deffn {Directive} %nonassoc -Bison declaration to assign nonassociativity to token(s). +Bison declaration to assign precedence and nonassociativity to token(s). @xref{Precedence Decl, ,Operator Precedence}. @end deffn @@ -9237,10 +10646,15 @@ Bison declaration to set the name of the parser file. @xref{Decl Summary}. @end deffn -@deffn {Directive} %parse-param @{@var{argument-declaration}@} -Bison declaration to specifying an additional parameter that -@code{yyparse} should accept. @xref{Parser Function,, The Parser -Function @code{yyparse}}. +@deffn {Directive} %param @{@var{argument-declaration}@} @dots{} +Bison declaration to specify additional arguments that both +@code{yylex} and @code{yyparse} should accept. @xref{Parser Function,, The +Parser Function @code{yyparse}}. +@end deffn + +@deffn {Directive} %parse-param @{@var{argument-declaration}@} @dots{} +Bison declaration to specify additional arguments that @code{yyparse} +should accept. @xref{Parser Function,, The Parser Function @code{yyparse}}. @end deffn @deffn {Directive} %prec @@ -9248,9 +10662,14 @@ Bison declaration to assign a precedence to a specific rule. @xref{Contextual Precedence, ,Context-Dependent Precedence}. @end deffn +@deffn {Directive} %precedence +Bison declaration to assign precedence to token(s), but no associativity +@xref{Precedence Decl, ,Operator Precedence}. +@end deffn + @deffn {Directive} %pure-parser -Bison declaration to request a pure (reentrant) parser. -@xref{Pure Decl, ,A Pure (Reentrant) Parser}. +Deprecated version of @samp{%define api.pure} (@pxref{Decl Summary, ,%define}), +for which Bison is more careful to warn about unreasonable usage. @end deffn @deffn {Directive} %require "@var{version}" @@ -9259,7 +10678,7 @@ Require a Version of Bison}. @end deffn @deffn {Directive} %right -Bison declaration to assign right associativity to token(s). +Bison declaration to assign precedence and right associativity to token(s). @xref{Precedence Decl, ,Operator Precedence}. @end deffn @@ -9363,16 +10782,16 @@ instead. @deffn {Function} yyerror User-supplied function to be called by @code{yyparse} on error. -@xref{Error Reporting, ,The Error -Reporting Function @code{yyerror}}. +@xref{Error Reporting, ,The Error Reporting Function @code{yyerror}}. @end deffn @deffn {Macro} YYERROR_VERBOSE -An obsolete macro that you define with @code{#define} in the prologue -to request verbose, specific error message strings -when @code{yyerror} is called. It doesn't matter what definition you -use for @code{YYERROR_VERBOSE}, just whether you define it. Using -@code{%error-verbose} is preferred. +An obsolete macro used in the @file{yacc.c} skeleton, that you define +with @code{#define} in the prologue to request verbose, specific error +message strings when @code{yyerror} is called. It doesn't matter what +definition you use for @code{YYERROR_VERBOSE}, just whether you define +it. Using @samp{%define parse.error verbose} is preferred +(@pxref{Error Reporting, ,The Error Reporting Function @code{yyerror}}). @end deffn @deffn {Macro} YYINITDEPTH @@ -9427,7 +10846,8 @@ Management}. @deffn {Variable} yynerrs Global variable which Bison increments each time it reports a syntax error. -(In a pure parser, it is a local variable within @code{yyparse}.) +(In a pure parser, it is a local variable within @code{yyparse}. In a +pure push parser, it is a member of yypstate.) @xref{Error Reporting, ,The Error Reporting Function @code{yyerror}}. @end deffn @@ -9436,6 +10856,41 @@ The parser function produced by Bison; call this function to start parsing. @xref{Parser Function, ,The Parser Function @code{yyparse}}. @end deffn +@deffn {Function} yypstate_delete +The function to delete a parser instance, produced by Bison in push mode; +call this function to delete the memory associated with a parser. +@xref{Parser Delete Function, ,The Parser Delete Function +@code{yypstate_delete}}. +(The current push parsing interface is experimental and may evolve. +More user feedback will help to stabilize it.) +@end deffn + +@deffn {Function} yypstate_new +The function to create a parser instance, produced by Bison in push mode; +call this function to create a new parser. +@xref{Parser Create Function, ,The Parser Create Function +@code{yypstate_new}}. +(The current push parsing interface is experimental and may evolve. +More user feedback will help to stabilize it.) +@end deffn + +@deffn {Function} yypull_parse +The parser function produced by Bison in push mode; call this function to +parse the rest of the input stream. +@xref{Pull Parser Function, ,The Pull Parser Function +@code{yypull_parse}}. +(The current push parsing interface is experimental and may evolve. +More user feedback will help to stabilize it.) +@end deffn + +@deffn {Function} yypush_parse +The parser function produced by Bison in push mode; call this function to +parse a single token. @xref{Push Parser Function, ,The Push Parser Function +@code{yypush_parse}}. +(The current push parsing interface is experimental and may evolve. +More user feedback will help to stabilize it.) +@end deffn + @deffn {Macro} YYPARSE_PARAM An obsolete macro for specifying the name of a parameter that @code{yyparse} should accept. The use of this macro is deprecated, and @@ -9450,8 +10905,8 @@ is recovering from a syntax error, and 0 otherwise. @end deffn @deffn {Macro} YYSTACK_USE_ALLOCA -Macro used to control the use of @code{alloca} when the C -@acronym{LALR}(1) parser needs to extend its stacks. If defined to 0, +Macro used to control the use of @code{alloca} when the +deterministic parser in C needs to extend its stacks. If defined to 0, the parser will use @code{malloc} to extend its stacks. If defined to 1, the parser will use @code{alloca}. Values other than 0 and 1 are reserved for future Bison extensions. If not defined, @@ -9476,12 +10931,21 @@ Data type of semantic values; @code{int} by default. @cindex glossary @table @asis +@item Accepting State +A state whose only action is the accept action. +The accepting state is thus a consistent state. +@xref{Understanding,,}. + @item Backus-Naur Form (@acronym{BNF}; also called ``Backus Normal Form'') Formal method of specifying context-free grammars originally proposed by John Backus, and slightly improved by Peter Naur in his 1960-01-02 committee document contributing to what became the Algol 60 report. @xref{Language and Grammar, ,Languages and Context-Free Grammars}. +@item Consistent State +A state containing only one possible action. +@xref{Decl Summary,,lr.default-reductions}. + @item Context-free grammars Grammars specified as rules that can be applied regardless of context. Thus, if there is a rule which says that an integer can be used as an @@ -9489,6 +10953,14 @@ expression, integers are allowed @emph{anywhere} an expression is permitted. @xref{Language and Grammar, ,Languages and Context-Free Grammars}. +@item Default Reduction +The reduction that a parser should perform if the current parser state +contains no other action for the lookahead token. +In permitted parser states, Bison declares the reduction with the +largest lookahead set to be the default reduction and removes that +lookahead set. +@xref{Decl Summary,,lr.default-reductions}. + @item Dynamic allocation Allocation of memory that occurs during execution, rather than at compile time or on entry to a function. @@ -9507,8 +10979,8 @@ rules. @xref{Algorithm, ,The Bison Parser Algorithm}. @item Generalized @acronym{LR} (@acronym{GLR}) A parsing algorithm that can handle all context-free grammars, including those -that are not @acronym{LALR}(1). It resolves situations that Bison's -usual @acronym{LALR}(1) +that are not @acronym{LR}(1). It resolves situations that Bison's +deterministic parsing algorithm cannot by effectively splitting off multiple parsers, trying all possible parsers, and discarding those that fail in the light of additional right context. @xref{Generalized LR Parsing, ,Generalized @@ -9519,6 +10991,20 @@ A language construct that is (in general) grammatically divisible; for example, `expression' or `declaration' in C@. @xref{Language and Grammar, ,Languages and Context-Free Grammars}. +@item @acronym{IELR}(1) +A minimal @acronym{LR}(1) parser table generation algorithm. +That is, given any context-free grammar, @acronym{IELR}(1) generates +parser tables with the full language recognition power of canonical +@acronym{LR}(1) but with nearly the same number of parser states as +@acronym{LALR}(1). +This reduction in parser states is often an order of magnitude. +More importantly, because canonical @acronym{LR}(1)'s extra parser +states may contain duplicate conflicts in the case of +non-@acronym{LR}(1) grammars, the number of conflicts for +@acronym{IELR}(1) is often an order of magnitude less as well. +This can significantly reduce the complexity of developing of a grammar. +@xref{Decl Summary,,lr.type}. + @item Infix operator An arithmetic operator that is placed between the operands on which it performs some operation. @@ -9562,8 +11048,8 @@ Tokens}. @item @acronym{LALR}(1) The class of context-free grammars that Bison (like most other parser -generators) can handle; a subset of @acronym{LR}(1). @xref{Mystery -Conflicts, ,Mysterious Reduce/Reduce Conflicts}. +generators) can handle by default; a subset of @acronym{LR}(1). +@xref{Mystery Conflicts, ,Mysterious Reduce/Reduce Conflicts}. @item @acronym{LR}(1) The class of context-free grammars in which at most one token of @@ -9644,11 +11130,6 @@ grammatically indivisible. The piece of text it represents is a token. @node Copying This Manual @appendix Copying This Manual - -@menu -* GNU Free Documentation License:: License for copying this manual. -@end menu - @include fdl.texi @node Index @@ -9658,32 +11139,59 @@ grammatically indivisible. The piece of text it represents is a token. @bye -@c LocalWords: texinfo setfilename settitle setchapternewpage finalout -@c LocalWords: ifinfo smallbook shorttitlepage titlepage GPL FIXME iftex -@c LocalWords: akim fn cp syncodeindex vr tp synindex dircategory direntry -@c LocalWords: ifset vskip pt filll insertcopying sp ISBN Etienne Suvasa -@c LocalWords: ifnottex yyparse detailmenu GLR RPN Calc var Decls Rpcalc -@c LocalWords: rpcalc Lexer Gen Comp Expr ltcalc mfcalc Decl Symtab yylex -@c LocalWords: yyerror pxref LR yylval cindex dfn LALR samp gpl BNF xref -@c LocalWords: const int paren ifnotinfo AC noindent emph expr stmt findex -@c LocalWords: glr YYSTYPE TYPENAME prog dprec printf decl init stmtMerge -@c LocalWords: pre STDC GNUC endif yy YY alloca lf stddef stdlib YYDEBUG -@c LocalWords: NUM exp subsubsection kbd Ctrl ctype EOF getchar isdigit -@c LocalWords: ungetc stdin scanf sc calc ulator ls lm cc NEG prec yyerrok -@c LocalWords: longjmp fprintf stderr yylloc YYLTYPE cos ln -@c LocalWords: smallexample symrec val tptr FNCT fnctptr func struct sym -@c LocalWords: fnct putsym getsym fname arith fncts atan ptr malloc sizeof -@c LocalWords: strlen strcpy fctn strcmp isalpha symbuf realloc isalnum -@c LocalWords: ptypes itype YYPRINT trigraphs yytname expseq vindex dtype -@c LocalWords: Rhs YYRHSLOC LE nonassoc op deffn typeless yynerrs -@c LocalWords: yychar yydebug msg YYNTOKENS YYNNTS YYNRULES YYNSTATES -@c LocalWords: cparse clex deftypefun NE defmac YYACCEPT YYABORT param -@c LocalWords: strncmp intval tindex lvalp locp llocp typealt YYBACKUP -@c LocalWords: YYEMPTY YYEOF YYRECOVERING yyclearin GE def UMINUS maybeword -@c LocalWords: Johnstone Shamsa Sadaf Hussain Tomita TR uref YYMAXDEPTH -@c LocalWords: YYINITDEPTH stmnts ref stmnt initdcl maybeasm notype -@c LocalWords: hexflag STR exdent itemset asis DYYDEBUG YYFPRINTF args -@c LocalWords: infile ypp yxx outfile itemx tex leaderfill -@c LocalWords: hbox hss hfill tt ly yyin fopen fclose ofirst gcc ll -@c LocalWords: nbar yytext fst snd osplit ntwo strdup AST -@c LocalWords: YYSTACK DVI fdl printindex +@c Local Variables: +@c fill-column: 76 +@c End: + +@c LocalWords: texinfo setfilename settitle setchapternewpage finalout texi FSF +@c LocalWords: ifinfo smallbook shorttitlepage titlepage GPL FIXME iftex FSF's +@c LocalWords: akim fn cp syncodeindex vr tp synindex dircategory direntry Naur +@c LocalWords: ifset vskip pt filll insertcopying sp ISBN Etienne Suvasa Multi +@c LocalWords: ifnottex yyparse detailmenu GLR RPN Calc var Decls Rpcalc multi +@c LocalWords: rpcalc Lexer Expr ltcalc mfcalc yylex defaultprec Donnelly Gotos +@c LocalWords: yyerror pxref LR yylval cindex dfn LALR samp gpl BNF xref yypush +@c LocalWords: const int paren ifnotinfo AC noindent emph expr stmt findex lr +@c LocalWords: glr YYSTYPE TYPENAME prog dprec printf decl init stmtMerge POSIX +@c LocalWords: pre STDC GNUC endif yy YY alloca lf stddef stdlib YYDEBUG yypull +@c LocalWords: NUM exp subsubsection kbd Ctrl ctype EOF getchar isdigit nonfree +@c LocalWords: ungetc stdin scanf sc calc ulator ls lm cc NEG prec yyerrok rr +@c LocalWords: longjmp fprintf stderr yylloc YYLTYPE cos ln Stallman Destructor +@c LocalWords: smallexample symrec val tptr FNCT fnctptr func struct sym enum +@c LocalWords: fnct putsym getsym fname arith fncts atan ptr malloc sizeof Lex +@c LocalWords: strlen strcpy fctn strcmp isalpha symbuf realloc isalnum DOTDOT +@c LocalWords: ptypes itype YYPRINT trigraphs yytname expseq vindex dtype Unary +@c LocalWords: Rhs YYRHSLOC LE nonassoc op deffn typeless yynerrs nonterminal +@c LocalWords: yychar yydebug msg YYNTOKENS YYNNTS YYNRULES YYNSTATES reentrant +@c LocalWords: cparse clex deftypefun NE defmac YYACCEPT YYABORT param yypstate +@c LocalWords: strncmp intval tindex lvalp locp llocp typealt YYBACKUP subrange +@c LocalWords: YYEMPTY YYEOF YYRECOVERING yyclearin GE def UMINUS maybeword loc +@c LocalWords: Johnstone Shamsa Sadaf Hussain Tomita TR uref YYMAXDEPTH inline +@c LocalWords: YYINITDEPTH stmnts ref stmnt initdcl maybeasm notype Lookahead +@c LocalWords: hexflag STR exdent itemset asis DYYDEBUG YYFPRINTF args Autoconf +@c LocalWords: infile ypp yxx outfile itemx tex leaderfill Troubleshouting sqrt +@c LocalWords: hbox hss hfill tt ly yyin fopen fclose ofirst gcc ll lookahead +@c LocalWords: nbar yytext fst snd osplit ntwo strdup AST Troublereporting th +@c LocalWords: YYSTACK DVI fdl printindex IELR nondeterministic nonterminals ps +@c LocalWords: subexpressions declarator nondeferred config libintl postfix +@c LocalWords: preprocessor nonpositive unary nonnumeric typedef extern rhs +@c LocalWords: yytokentype filename destructor multicharacter nonnull EBCDIC +@c LocalWords: lvalue nonnegative XNUM CHR chr TAGLESS tagless stdout api TOK +@c LocalWords: destructors Reentrancy nonreentrant subgrammar nonassociative +@c LocalWords: deffnx namespace xml goto lalr ielr runtime lex yacc yyps env +@c LocalWords: yystate variadic Unshift NLS gettext po UTF Automake LOCALEDIR +@c LocalWords: YYENABLE bindtextdomain Makefile DEFS CPPFLAGS DBISON DeRemer +@c LocalWords: autoreconf Pennello multisets nondeterminism Generalised baz +@c LocalWords: redeclare automata Dparse localedir datadir XSLT midrule Wno +@c LocalWords: makefiles Graphviz multitable headitem hh basename Doxygen fno +@c LocalWords: doxygen ival sval deftypemethod deallocate pos deftypemethodx +@c LocalWords: Ctor defcv defcvx arg accessors arithmetics CPP ifndef CALCXX +@c LocalWords: lexer's calcxx bool LPAREN RPAREN deallocation cerrno climits +@c LocalWords: cstdlib Debian undef yywrap unput noyywrap nounput zA yyleng +@c LocalWords: errno strtol ERANGE str strerror iostream argc argv Javadoc +@c LocalWords: bytecode initializers superclass stype ASTNode autoboxing nls +@c LocalWords: toString deftypeivar deftypeivarx deftypeop YYParser strictfp +@c LocalWords: superclasses boolean getErrorVerbose setErrorVerbose deftypecv +@c LocalWords: getDebugStream setDebugStream getDebugLevel setDebugLevel url +@c LocalWords: bisonVersion deftypecvx bisonSkeleton getStartPos getEndPos +@c LocalWords: getLVal defvar YYFAIL deftypefn deftypefnx gotos msgfmt +@c LocalWords: subdirectory Solaris nonassociativity