mirror of https://github.com/ZDoom/qzdoom.git
Lemon update 2015-11-09 19:33:42 on branch parser-enhancements
- Change the parser to use the standard "lempar.c" template over in the tool/ folder rather than the customized "lempar.c" found in src/. (user: drh)
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Randy Heit
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59b14415ff
commit
e9501e8688
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@ -1,8 +1,27 @@
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/* Driver template for the LEMON parser generator.
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** The author disclaims copyright to this source code.
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/*
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** 2000-05-29
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**
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** The author disclaims copyright to this source code. In place of
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** a legal notice, here is a blessing:
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**
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** May you do good and not evil.
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** May you find forgiveness for yourself and forgive others.
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** May you share freely, never taking more than you give.
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**
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*************************************************************************
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** Driver template for the LEMON parser generator.
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**
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** The "lemon" program processes an LALR(1) input grammar file, then uses
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** this template to construct a parser. The "lemon" program inserts text
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** at each "%%" line. Also, any "P-a-r-s-e" identifer prefix (without the
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** interstitial "-" characters) contained in this template is changed into
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** the value of the %name directive from the grammar. Otherwise, the content
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** of this template is copied straight through into the generate parser
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** source file.
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**
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** The following is the concatenation of all %include directives from the
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** input grammar file:
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*/
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/* First off, code is included that follows the "include" declaration
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** in the input grammar file. */
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#include <stdio.h>
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#include <string.h>
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#include <assert.h>
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@ -13,46 +32,46 @@
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#define CDECL
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#endif
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/************ Begin %include sections from the grammar ************************/
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%%
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/* Next is all token values, in a form suitable for use by makeheaders.
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** This section will be null unless lemon is run with the -m switch.
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*/
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/*
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** These constants (all generated automatically by the parser generator)
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** specify the various kinds of tokens (terminals) that the parser
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** understands.
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**
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** Each symbol here is a terminal symbol in the grammar.
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*/
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/**************** End of %include directives **********************************/
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/* These constants specify the various numeric values for terminal symbols
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** in a format understandable to "makeheaders". This section is blank unless
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** "lemon" is run with the "-m" command-line option.
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***************** Begin makeheaders token definitions *************************/
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%%
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/* Make sure the INTERFACE macro is defined.
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*/
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#ifndef INTERFACE
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# define INTERFACE 1
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#endif
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/* The next thing included is series of defines which control
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/**************** End makeheaders token definitions ***************************/
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/* The next section is a series of control #defines.
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** various aspects of the generated parser.
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** YYCODETYPE is the data type used for storing terminal
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** and nonterminal numbers. "unsigned char" is
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** used if there are fewer than 250 terminals
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** and nonterminals. "int" is used otherwise.
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** YYNOCODE is a number of type YYCODETYPE which corresponds
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** to no legal terminal or nonterminal number. This
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** number is used to fill in empty slots of the hash
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** table.
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** YYCODETYPE is the data type used to store the integer codes
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** that represent terminal and non-terminal symbols.
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** "unsigned char" is used if there are fewer than
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** 256 symbols. Larger types otherwise.
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** YYNOCODE is a number of type YYCODETYPE that is not used for
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** any terminal or nonterminal symbol.
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** YYFALLBACK If defined, this indicates that one or more tokens
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** have fall-back values which should be used if the
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** original value of the token will not parse.
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** YYACTIONTYPE is the data type used for storing terminal
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** and nonterminal numbers. "unsigned char" is
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** used if there are fewer than 250 rules and
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** states combined. "int" is used otherwise.
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** ParseTOKENTYPE is the data type used for minor tokens given
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** directly to the parser from the tokenizer.
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** YYMINORTYPE is the data type used for all minor tokens.
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** (also known as: "terminal symbols") have fall-back
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** values which should be used if the original symbol
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** would not parse. This permits keywords to sometimes
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** be used as identifiers, for example.
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** YYACTIONTYPE is the data type used for "action codes" - numbers
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** that indicate what to do in response to the next
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** token.
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** ParseTOKENTYPE is the data type used for minor type for terminal
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** symbols. Background: A "minor type" is a semantic
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** value associated with a terminal or non-terminal
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** symbols. For example, for an "ID" terminal symbol,
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** the minor type might be the name of the identifier.
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** Each non-terminal can have a different minor type.
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** Terminal symbols all have the same minor type, though.
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** This macros defines the minor type for terminal
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** symbols.
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** YYMINORTYPE is the data type used for all minor types.
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** This is typically a union of many types, one of
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** which is ParseTOKENTYPE. The entry in the union
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** for base tokens is called "yy0".
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** for terminal symbols is called "yy0".
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** YYSTACKDEPTH is the maximum depth of the parser's stack. If
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** zero the stack is dynamically sized using realloc()
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** ParseARG_SDECL A static variable declaration for the %extra_argument
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@ -71,7 +90,12 @@
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** YY_ACCEPT_ACTION The yy_action[] code for accept
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** YY_NO_ACTION The yy_action[] code for no-op
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*/
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#ifndef INTERFACE
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# define INTERFACE 1
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#endif
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/************* Begin control #defines *****************************************/
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%%
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/************* End control #defines *******************************************/
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/* The yyzerominor constant is used to initialize instances of
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** YYMINORTYPE objects to zero. */
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@ -140,11 +164,13 @@ static const YYMINORTYPE yyzerominor = { 0 };
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** yy_reduce_ofst[] For each state, the offset into yy_action for
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** shifting non-terminals after a reduce.
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** yy_default[] Default action for each state.
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*/
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**
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*********** Begin parsing tables **********************************************/
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%%
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/********** End of lemon-generated parsing tables *****************************/
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/* The next table maps tokens into fallback tokens. If a construct
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** like the following:
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/* The next table maps tokens (terminal symbols) into fallback tokens.
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** If a construct like the following:
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**
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** %fallback ID X Y Z.
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**
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@ -152,6 +178,10 @@ static const YYMINORTYPE yyzerominor = { 0 };
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** and Z. Whenever one of the tokens X, Y, or Z is input to the parser
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** but it does not parse, the type of the token is changed to ID and
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** the parse is retried before an error is thrown.
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**
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** This feature can be used, for example, to cause some keywords in a language
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** to revert to identifiers if they keyword does not apply in the context where
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** it appears.
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*/
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#ifdef YYFALLBACK
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static const YYCODETYPE yyFallback[] = {
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@ -273,6 +303,15 @@ static void yyGrowStack(yyParser *p){
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}
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#endif
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/* Datatype of the argument to the memory allocated passed as the
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** second argument to ParseAlloc() below. This can be changed by
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** putting an appropriate #define in the %include section of the input
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** grammar.
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*/
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#ifndef YYMALLOCARGTYPE
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# define YYMALLOCARGTYPE size_t
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#endif
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/*
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** This function allocates a new parser.
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** The only argument is a pointer to a function which works like
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@ -285,9 +324,9 @@ static void yyGrowStack(yyParser *p){
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** A pointer to a parser. This pointer is used in subsequent calls
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** to Parse and ParseFree.
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*/
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void *ParseAlloc(void *(CDECL *mallocProc)(size_t)){
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void *ParseAlloc(void *(CDECL *mallocProc)(YYMALLOCARGTYPE)){
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yyParser *pParser;
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pParser = (yyParser*)(*mallocProc)( (size_t)sizeof(yyParser) );
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pParser = (yyParser*)(*mallocProc)( (YYMALLOCARGTYPE)sizeof(yyParser) );
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if( pParser ){
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pParser->yyidx = -1;
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#ifdef YYTRACKMAXSTACKDEPTH
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@ -302,10 +341,12 @@ void *ParseAlloc(void *(CDECL *mallocProc)(size_t)){
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return pParser;
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}
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/* The following function deletes the value associated with a
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** symbol. The symbol can be either a terminal or nonterminal.
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** "yymajor" is the symbol code, and "yypminor" is a pointer to
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** the value.
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/* The following function deletes the "minor type" or semantic value
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** associated with a symbol. The symbol can be either a terminal
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** or nonterminal. "yymajor" is the symbol code, and "yypminor" is
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** a pointer to the value to be deleted. The code used to do the
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** deletions is derived from the %destructor and/or %token_destructor
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** directives of the input grammar.
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*/
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static void yy_destructor(
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yyParser *yypParser, /* The parser */
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** being destroyed before it is finished parsing.
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**
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** Note: during a reduce, the only symbols destroyed are those
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** which appear on the RHS of the rule, but which are not used
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** which appear on the RHS of the rule, but which are *not* used
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** inside the C code.
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*/
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/********* Begin destructor definitions ***************************************/
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%%
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/********* End destructor definitions *****************************************/
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default: break; /* If no destructor action specified: do nothing */
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}
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}
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@ -350,23 +393,21 @@ static void yy_pop_parser_stack(yyParser *pParser){
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}
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/*
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** Deallocate and destroy a parser. Destructors are all called for
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** Deallocate and destroy a parser. Destructors are called for
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** all stack elements before shutting the parser down.
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**
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** Inputs:
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** <ul>
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** <li> A pointer to the parser. This should be a pointer
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** obtained from ParseAlloc.
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** <li> A pointer to a function used to reclaim memory obtained
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** from malloc.
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** </ul>
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*
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** If the YYPARSEFREENEVERNULL macro exists (for example because it
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** is defined in a %include section of the input grammar) then it is
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** assumed that the input pointer is never NULL.
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*/
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void ParseFree(
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void *p, /* The parser to be deleted */
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void (CDECL *freeProc)(void*) /* Function used to reclaim memory */
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){
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yyParser *pParser = (yyParser*)p;
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#ifndef YYPARSEFREENEVERNULL
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if( pParser==0 ) return;
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#endif
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while( pParser->yyidx>=0 ) yy_pop_parser_stack(pParser);
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#if YYSTACKDEPTH<=0
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free(pParser->yystack);
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@ -387,10 +428,6 @@ int ParseStackPeak(void *p){
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/*
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** Find the appropriate action for a parser given the terminal
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** look-ahead token iLookAhead.
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**
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** If the look-ahead token is YYNOCODE, then check to see if the action is
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** independent of the look-ahead. If it is, return the action, otherwise
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** return YY_NO_ACTION.
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*/
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static int yy_find_shift_action(
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yyParser *pParser, /* The parser */
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/*
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** Find the appropriate action for a parser given the non-terminal
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** look-ahead token iLookAhead.
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**
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** If the look-ahead token is YYNOCODE, then check to see if the action is
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** independent of the look-ahead. If it is, return the action, otherwise
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** return YY_NO_ACTION.
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*/
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static int yy_find_reduce_action(
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int stateno, /* Current state number */
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@ -503,7 +536,9 @@ static void yyStackOverflow(yyParser *yypParser, YYMINORTYPE *yypMinor){
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while( yypParser->yyidx>=0 ) yy_pop_parser_stack(yypParser);
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/* Here code is inserted which will execute if the parser
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** stack ever overflows */
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/******** Begin %stack_overflow code ******************************************/
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%%
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/******** End %stack_overflow code ********************************************/
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ParseARG_STORE; /* Suppress warning about unused %extra_argument var */
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}
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@ -530,7 +565,7 @@ static void yyTraceShift(yyParser *yypParser, int yyNewState){
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#endif
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/*
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** Perform a shift action. Return the number of errors.
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** Perform a shift action.
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*/
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static void yy_shift(
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yyParser *yypParser, /* The parser to be shifted */
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@ -602,21 +637,6 @@ static void yy_reduce(
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}
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#endif /* NDEBUG */
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/* Silence complaints from purify about yygotominor being uninitialized
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** in some cases when it is copied into the stack after the following
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** switch. yygotominor is uninitialized when a rule reduces that does
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** not set the value of its left-hand side nonterminal. Leaving the
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** value of the nonterminal uninitialized is utterly harmless as long
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** as the value is never used. So really the only thing this code
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** accomplishes is to quieten purify.
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**
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** 2007-01-16: The wireshark project (www.wireshark.org) reports that
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** without this code, their parser segfaults. I'm not sure what there
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** parser is doing to make this happen. This is the second bug report
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** from wireshark this week. Clearly they are stressing Lemon in ways
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** that it has not been previously stressed... (SQLite ticket #2172)
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*/
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/*memset(&yygotominor, 0, sizeof(yygotominor));*/
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yygotominor = yyzerominor;
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switch( yyruleno ){
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@ -628,7 +648,9 @@ static void yy_reduce(
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** #line <lineno> <thisfile>
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** break;
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*/
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/********** Begin reduce actions **********************************************/
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%%
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/********** End reduce actions ************************************************/
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};
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assert( yyruleno>=0 && yyruleno<sizeof(yyRuleInfo)/sizeof(yyRuleInfo[0]) );
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yygoto = yyRuleInfo[yyruleno].lhs;
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@ -673,7 +695,9 @@ static void yy_parse_failed(
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while( yypParser->yyidx>=0 ) yy_pop_parser_stack(yypParser);
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/* Here code is inserted which will be executed whenever the
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** parser fails */
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/************ Begin %parse_failure code ***************************************/
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%%
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/************ End %parse_failure code *****************************************/
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ParseARG_STORE; /* Suppress warning about unused %extra_argument variable */
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}
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#endif /* YYNOERRORRECOVERY */
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){
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ParseARG_FETCH;
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#define TOKEN (yyminor.yy0)
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/************ Begin %syntax_error code ****************************************/
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%%
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/************ End %syntax_error code ******************************************/
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ParseARG_STORE; /* Suppress warning about unused %extra_argument variable */
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}
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@ -707,7 +733,9 @@ static void yy_accept(
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while( yypParser->yyidx>=0 ) yy_pop_parser_stack(yypParser);
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/* Here code is inserted which will be executed whenever the
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** parser accepts */
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/*********** Begin %parse_accept code *****************************************/
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%%
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/*********** End %parse_accept code *******************************************/
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ParseARG_STORE; /* Suppress warning about unused %extra_argument variable */
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}
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